module BTS_Tests {

import from General_Types all;
import from GSM_Types all;
import from GSM_RR_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from GSM_SystemInformation all;
import from L1CTL_PortType all;
import from L1CTL_Types all;
import from LAPDm_Types all;
import from Osmocom_CTRL_Adapter all;
import from Osmocom_CTRL_Functions all;

import from RSL_Types all;
import from IPA_Types all;
import from IPA_Emulation all;
import from RSL_Emulation all;

import from IPL4asp_Types all;
import from TRXC_Types all;
import from TRXC_CodecPort all;
import from TRXC_CodecPort_CtrlFunct all;

import from PCUIF_Types all;
import from PCUIF_CodecPort all;

import from MobileL3_CommonIE_Types all;
import from MobileL3_RRM_Types all;
import from MobileL3_Types all;
import from L3_Templates all;

import from Osmocom_VTY_Functions all;
import from TELNETasp_PortType all;

/* The tests assume a BTS with the following timeslot configuration:
 * TS0 : Combined CCCH + SDCCH/4
 * TS1 : TCH/F
 * TS2 : TCH/F
 * TS3 : TCH/F_PDCH (IPA Style)
 * TS4 : TCH/F_TCH/H_PDCH (Osmocom Style)
 * TS5 : TCH/H
 * TS6 : SDCCH/8
 * TS7 : PDCH
 */

modulepar {
	charstring mp_rsl_ip := "127.0.0.2";
	integer mp_rsl_port := 3003;
	integer mp_trx0_arfcn := 871;
	charstring mp_bb_trxc_ip := "127.0.0.1";
	integer mp_bb_trxc_port := 6701;
	charstring mp_pcu_socket := PCU_SOCK_DEFAULT;
	charstring mp_ctrl_ip := "127.0.0.1";
	integer mp_ctrl_port := 4238;
	integer mp_tolerance_rxqual := 1;
	integer mp_tolerance_rxlev := 3;
	integer mp_tolerance_timing_offset_256syms := 0;
	integer mp_rxlev_exp := 57;
	integer mp_ms_power_level_exp := 7;
	integer mp_ms_actual_ta_exp := 0;
	integer mp_timing_offset_256syms_exp := 512;
}

type record of RslChannelNr ChannelNrs;

type component test_CT extends CTRL_Adapter_CT {
	/* IPA Emulation component underneath RSL */
	var IPA_Emulation_CT vc_IPA;
	/* RSL Emulation component (for ConnHdlr tests) */
	var RSL_Emulation_CT vc_RSL;
	/* Direct RSL_CCHAN_PT */
	port RSL_CCHAN_PT RSL_CCHAN;

	/* L1CTL port (for classic tests) */
	port L1CTL_PT L1CTL;

	/* TRXC port (for classic tests) */
	port TRXC_CODEC_PT BB_TRXC;
	var integer g_bb_trxc_conn_id;

	/* VTY connections to both BTS and BSC */
	port TELNETasp_PT BTSVTY;
	port TELNETasp_PT BSCVTY;

	/* PCU Interface of BTS */
	port PCUIF_CODEC_PT PCU;
	var integer g_pcu_conn_id;
	/* Last PCU INFO IND we received */
	var PCUIF_Message g_pcu_last_info;

	/* SI configuration */
	var SystemInformationConfig si_cfg := {
		bcch_extended := false,
		si1_present := false,
		si2bis_present := false,
		si2ter_present := false,
		si2quater_present := false,
		si7_present := false,
		si8_present := false,
		si9_present := false,
		si13_present := false,
		si13alt_present := false,
		si15_present := false,
		si16_present := false,
		si17_present := false,
		si2n_present := false,
		si21_present := false,
		si22_present := false
	};

	/* all logical channels available on the BTS */
	var ChannelNrs g_AllChannels;
	var ChannelNrs g_AllChanTypes;
}

/* an individual call / channel */
type component ConnHdlr extends RSL_DchanHdlr {
	port L1CTL_PT L1CTL;

	port TRXC_CODEC_PT BB_TRXC;
	var integer g_bb_trxc_conn_id;

	timer g_Tguard;
	timer g_Tmeas_exp := 2.0; /* >= 103 SACCH multiframe ~ 500ms */

	var ConnHdlrPars g_pars;
	var uint8_t g_next_meas_res_nr := 0;
	var boolean g_first_meas_res := true;

	/* PCU Interface of BTS */
	port PCUIF_CODEC_PT PCU;
}

function f_init_rsl(charstring id) runs on test_CT {
	vc_IPA := IPA_Emulation_CT.create(id & "-RSL-IPA");
	vc_RSL := RSL_Emulation_CT.create(id & "-RSL");

	map(vc_IPA:IPA_PORT, system:IPA_CODEC_PT);
	connect(vc_IPA:IPA_RSL_PORT, vc_RSL:IPA_PT);
	connect(self:RSL_CCHAN, vc_RSL:CCHAN_PT);

	vc_IPA.start(IPA_Emulation.main_server(mp_rsl_ip, mp_rsl_port));
	vc_RSL.start(RSL_Emulation.main(false));
}

type record ConnHdlrPars {
	RslChannelNr chan_nr,
	RSL_IE_ChannelMode chan_mode,
	float t_guard,
	ConnL1Pars l1_pars,
	TestSpecUnion spec optional,
	RSL_IE_EncryptionInfo encr optional
}

/* Test-specific parameters */
type union TestSpecUnion {
	RllTestCase rll
}

template (value) RachControlParameters ts_RachCtrl_default := {
	max_retrans := RACH_MAX_RETRANS_7,
	tx_integer := '1001'B, /* 12 slots */
	cell_barr_access := false,
	re_not_allowed := true,
	acc := '0000010000000000'B
};

template (value) CellSelectionParameters ts_CellSelPar_default := {
	cell_resel_hyst_2dB := 2,
	ms_txpwr_max_cch := mp_ms_power_level_exp,
	acs := '0'B,
	neci := true,
	rxlev_access_min := 0
}

template (value) LocationAreaIdentification ts_LAI_default := {
	mcc_mnc := '262F42'H,
	lac := 42
}

/* Default SYSTEM INFORMATION 3 */
template (value) SystemInformation ts_SI3_default := {
	header := ts_RrHeader(SYSTEM_INFORMATION_TYPE_3, 18),
	payload := {
		si3 := {
			cell_id := 23,
			lai := ts_LAI_default,
			ctrl_chan_desc := {
				msc_r99 := true,
				att := true,
				bs_ag_blks_res := 1,
				ccch_conf := CCHAN_DESC_1CCCH_COMBINED,
				si22ind := false,
				cbq3 := CBQ3_IU_MODE_NOT_SUPPORTED,
				spare := '00'B,
				bs_pa_mfrms := 0, /* 2 multiframes */
				t3212 := 1 /* 6 minutes */
			},
			cell_options := {
				dn_ind := false,
				pwrc := false,
				dtx := MS_MAY_USE_UL_DTX,
				radio_link_tout_div4 := (32/4)-1
			},
			cell_sel_par := ts_CellSelPar_default,
			rach_control := ts_RachCtrl_default,
			rest_octets := '2B2B2B2B'O
		}
	}
}

template (value) SystemInformation ts_SI2_default := {
	header := ts_RrHeader(SYSTEM_INFORMATION_TYPE_2, 22),
	payload := {
		si2 := {
			bcch_freq_list := '00000000000000000000000000000000'O,
			ncc_permitted := '11111111'B,
			rach_control := ts_RachCtrl_default
		}
	}
}

template (value) SystemInformation ts_SI4_default := {
	header := ts_RrHeader(SYSTEM_INFORMATION_TYPE_4, 12), /* no CBCH / restoct */
	payload := {
		si4 := {
			lai := ts_LAI_default,
			cell_sel_par := ts_CellSelPar_default,
			rach_control := ts_RachCtrl_default,
			cbch_chan_desc := omit,
			cbch_mobile_alloc := omit,
			rest_octets := ''O
		}
	}
}

function f_rsl_bcch_fill_raw(RSL_IE_SysinfoType rsl_si_type, octetstring si_enc)
runs on test_CT {
	log("Setting ", rsl_si_type, ": ", si_enc);
	RSL_CCHAN.send(ts_RSL_UD(ts_RSL_BCCH_INFO(rsl_si_type, si_enc)));
}

function f_rsl_bcch_fill(RSL_IE_SysinfoType rsl_si_type, template (value) SystemInformation si_dec)
runs on test_CT {
	var octetstring si_enc := enc_SystemInformation(valueof(si_dec));
	log("Setting ", rsl_si_type, ": ", si_dec);
	f_rsl_bcch_fill_raw(rsl_si_type, si_enc);
}

private function f_init_vty(charstring id) runs on test_CT {
	map(self:BTSVTY, system:BTSVTY);
	f_vty_set_prompts(BTSVTY);
	f_vty_transceive(BTSVTY, "enable");
}

private function f_init_vty_bsc() runs on test_CT {
	map(self:BSCVTY, system:BSCVTY);
	f_vty_set_prompts(BSCVTY, "OsmoBSC");
	f_vty_transceive(BSCVTY, "enable");
}

/* PCU socket may at any time receive a new INFO.ind */
private altstep as_pcu_info_ind(PCUIF_CODEC_PT pt, integer pcu_conn_id,
				out PCUIF_Message pcu_last_info) {
	var PCUIF_send_data sd;
	[] pt.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(0, ?))) -> value sd {
		pcu_last_info := sd.data;
		}
	[] pt.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(?, ?, ?))) -> value sd {
		setverdict(fail, "Invalid PCU Version/BTS Number received");
		mtc.stop;
		}
}

private function f_init_pcu(PCUIF_CODEC_PT pt, charstring id,
			    out integer pcu_conn_id, out PCUIF_Message pcu_last_info) {
	timer T := 2.0;
	var PCUIF_send_data sd;
	if (mp_pcu_socket == "") {
		pcu_conn_id := -1;
		return;
	}
	pcu_conn_id := f_pcuif_connect(pt, mp_pcu_socket);

	T.start;
	alt {
	[] as_pcu_info_ind(pt, pcu_conn_id, pcu_last_info);
	[] T.timeout {
		setverdict(fail, "Timeout waiting for PCU INFO_IND");
		mtc.stop;
		}
	}
}

/* global init function */
function f_init(charstring id := "BTS-Test") runs on test_CT {
	timer T := 10.0;
	g_AllChannels := {
		/* TS 1..4: TCH/F */
		valueof(ts_RslChanNr_Bm(1)), valueof(ts_RslChanNr_Bm(2)),
		valueof(ts_RslChanNr_Bm(3)), valueof(ts_RslChanNr_Bm(4)),
		/* TS 5: TCH/H */
		valueof(ts_RslChanNr_Lm(5,0)), valueof(ts_RslChanNr_Lm(5,1)),
		/* TS 0: SDCCH/4 */
		valueof(ts_RslChanNr_SDCCH4(0,0)), valueof(ts_RslChanNr_SDCCH4(0,1)),
		valueof(ts_RslChanNr_SDCCH4(0,2)), valueof(ts_RslChanNr_SDCCH4(0,3)),
		/* TS 6: SDCCH/8 */
		valueof(ts_RslChanNr_SDCCH8(6,0)), valueof(ts_RslChanNr_SDCCH8(6,1)),
		valueof(ts_RslChanNr_SDCCH8(6,2)), valueof(ts_RslChanNr_SDCCH8(6,3)),
		valueof(ts_RslChanNr_SDCCH8(6,4)), valueof(ts_RslChanNr_SDCCH8(6,5)),
		valueof(ts_RslChanNr_SDCCH8(6,6)), valueof(ts_RslChanNr_SDCCH8(6,7))
	};
	g_AllChanTypes := {
		/* TS 1..4: TCH/F */
		valueof(ts_RslChanNr_Bm(1)),
		/* TS 5: TCH/H */
		valueof(ts_RslChanNr_Lm(5,1)),
		/* TS 0: SDCCH/4 */
		valueof(ts_RslChanNr_SDCCH4(0,2)),
		/* TS 6: SDCCH/8 */
		valueof(ts_RslChanNr_SDCCH8(6,4))
	};

	f_init_rsl(id);
	T.start;
	alt {
	[] RSL_CCHAN.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_UP});
	[] T.timeout {
		setverdict(fail, "Timeout waiting for ASP_IPA_EVENT_UP");
		mtc.stop;
		}
	}
	f_sleep(0.5);	/* workaround for OS#3000 */
	f_init_vty(id);
	f_ipa_ctrl_start(mp_ctrl_ip, mp_ctrl_port);

	/* Send SI3 to the BTS, it is needed for various computations */
	f_rsl_bcch_fill(RSL_SYSTEM_INFO_3, ts_SI3_default);
	/* SI2 + SI4 are required for SI testing as they are mandatory defaults */
	f_rsl_bcch_fill(RSL_SYSTEM_INFO_2, ts_SI2_default);
	f_rsl_bcch_fill(RSL_SYSTEM_INFO_4, ts_SI4_default);

	map(self:PCU, system:PCU);
	f_init_pcu(PCU, id, g_pcu_conn_id, g_pcu_last_info);

	if (mp_bb_trxc_port != -1) {
		var TrxcMessage ret;
		/* start with a default moderate timing offset equalling TA=2 */
		f_main_trxc_connect();
		ret := f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(2*256)));
	}
}

function f_shutdown() runs on test_CT {
	/* mtc.stop cleanly stops testcase execution to avoid unclean shutdown */
	all component.stop;
	mtc.stop;
}

/* Attach L1CTL to master test_CT (classic tests, non-handler mode) */
function f_init_l1ctl() runs on test_CT {
	map(self:L1CTL, system:L1CTL);
	f_connect_reset(L1CTL);
}

type function void_fn(charstring id) runs on ConnHdlr;

/* create a new test component */
function f_start_handler(void_fn fn, ConnHdlrPars pars, boolean pcu_comp := false)
runs on test_CT return ConnHdlr {
	var charstring id := testcasename();
	var ConnHdlr vc_conn;

	vc_conn := ConnHdlr.create(id);
	/* connect to RSL Emulation main component */
	connect(vc_conn:RSL, vc_RSL:CLIENT_PT);
	connect(vc_conn:RSL_PROC, vc_RSL:RSL_PROC);
	if (pcu_comp) {
		/* the ConnHdlr component wants to talk directly to the PCU, so disconnect
		 * it from the test_CT and connect it to the component.  This obviously only
		 * works for one component, i.e. no concurrency */
		unmap(self:PCU, system:PCU);
		map(vc_conn:PCU, system:PCU);
	}

	vc_conn.start(f_handler_init(fn, id, pars));
	return vc_conn;
}

template ASP_RSL_Unitdata ts_RSL_UD(template RSL_Message rsl, IpaStreamId sid := IPAC_PROTO_RSL_TRX0) := {
	streamId := sid,
	rsl := rsl
}

template ASP_RSL_Unitdata tr_RSL_UD(template RSL_Message rsl,
				    template IpaStreamId sid := IPAC_PROTO_RSL_TRX0) := {
	streamId := sid,
	rsl := rsl
}

private altstep as_Tguard() runs on ConnHdlr {
	[] g_Tguard.timeout {
		setverdict(fail, "Tguard timeout");
		mtc.stop;
	}
}

private function f_l1_tune(L1CTL_PT L1CTL) {
	f_L1CTL_FBSB(L1CTL, { false, mp_trx0_arfcn }, CCCH_MODE_COMBINED, mp_rxlev_exp);
}

private function f_trxc_connect() runs on ConnHdlr {
	map(self:BB_TRXC, system:BB_TRXC);
	var Result res;
	res := TRXC_CodecPort_CtrlFunct.f_IPL4_connect(BB_TRXC, mp_bb_trxc_ip, mp_bb_trxc_port,
							"", -1, -1, {udp:={}}, {});
	if (not ispresent(res.connId)) {
		setverdict(fail, "Could not connect to trx-control interface of trxcon, check your configuration");
		mtc.stop;
	}
	g_bb_trxc_conn_id := res.connId;
}

private function f_trxc_fake_rssi(uint8_t rssi) runs on ConnHdlr {
	var TrxcMessage ret;
	ret := f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_RSSI(rssi)));
}

private function f_trx_fake_toffs256(int16_t toffs256) runs on ConnHdlr {
	var TrxcMessage ret;
	ret := f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(toffs256)));
}

/* first function started in ConnHdlr component */
private function f_handler_init(void_fn fn, charstring id, ConnHdlrPars pars)
runs on ConnHdlr {
	g_pars := pars;
	g_chan_nr := pars.chan_nr;

	map(self:L1CTL, system:L1CTL);
	f_connect_reset(L1CTL);

	if (mp_bb_trxc_port != -1) {
		f_trxc_connect();
	}

	g_Tguard.start(pars.t_guard);
	activate(as_Tguard());

	f_rslem_register(0, pars.chan_nr);

	/* call the user-supplied test case function */
	fn.apply(id);
}

function f_rsl_transceive_ret(template RSL_Message tx, template RSL_Message exp_rx, charstring id,
				boolean ignore_other := false)
runs on ConnHdlr return RSL_Message {
	var RSL_Message rx;
	timer T := 3.0;
	RSL.send(tx);
	T.start;
	alt {
	[] RSL.receive(exp_rx) -> value rx {
		T.stop;
		setverdict(pass);
		}
	[] T.timeout {
		setverdict(fail, "Timeout expecting " & id);
		mtc.stop;
		}
	[not ignore_other] as_l1_sacch();
	[not ignore_other] as_meas_res();
	[not ignore_other] as_l1_dcch();
	[not ignore_other] RSL.receive {
		setverdict(fail, "Unexpected RSL message received");
		mtc.stop;
		}
	[ignore_other] RSL.receive { repeat; }
	}
	return rx;
}

function f_rsl_transceive(template RSL_Message tx, template RSL_Message exp_rx, charstring id,
			  boolean ignore_other := false)
runs on ConnHdlr {
	var RSL_Message rx := f_rsl_transceive_ret(tx, exp_rx, id, ignore_other);
}

function f_rsl_chan_act(RSL_IE_ChannelMode mode, boolean encr_enable := false)
runs on ConnHdlr {
	var RSL_Message ch_act := valueof(ts_RSL_CHAN_ACT(g_chan_nr, mode));
	if (encr_enable) {
		/* append encryption related IEs, if requested */
		var RSL_IE_EncryptionInfo encr_info;
		encr_info := valueof(ts_RSL_IE_EncrInfo(g_pars.encr.alg_id, g_pars.encr.key));
		ch_act.ies := ch_act.ies & { valueof(t_RSL_IE(RSL_IE_ENCR_INFO, RSL_IE_Body:{encr_info :=
encr_info})) };
	}
	f_rsl_transceive(ch_act, tr_RSL_CHAN_ACT_ACK(g_chan_nr), "RSL CHAN ACT");
}

function f_rsl_chan_deact() runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_RF_CHAN_REL(g_chan_nr), tr_RSL_RF_CHAN_REL_ACK(g_chan_nr),
			"RF CHAN REL", true);
}

private template ConnHdlrPars t_Pars(template RslChannelNr chan_nr,
					template RSL_IE_ChannelMode chan_mode,
					float t_guard := 20.0) := {
	chan_nr := valueof(chan_nr),
	chan_mode := valueof(chan_mode),
	t_guard := t_guard,
	l1_pars := {
		dtx_enabled := false,
		toa256_enabled := false,
		meas_ul := {
			full := {
				rxlev := dbm2rxlev(-53),
				rxqual := 0
			},
			sub := {
				rxlev := dbm2rxlev(-53),
				rxqual := 0
			}
		},
		timing_offset_256syms := mp_timing_offset_256syms_exp,
		bs_power_level := 0,
		ms_power_level := mp_ms_power_level_exp,
		ms_actual_ta := mp_ms_actual_ta_exp
	},
	spec := omit,
	encr := omit
}

/***********************************************************************
 * Channel Activation / Deactivation
 ***********************************************************************/

/* Stress test: Do 500 channel activations/deactivations in rapid succession */
function f_TC_chan_act_stress(charstring id) runs on ConnHdlr {
	for (var integer i := 0; i < 500; i := i+1) {
		f_rsl_chan_act(g_pars.chan_mode);
		f_rsl_chan_deact();
	}
	setverdict(pass);
}
testcase TC_chan_act_stress() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init(testcasename());
	vc_conn := f_start_handler(refers(f_TC_chan_act_stress), pars);
	vc_conn.done;
	f_shutdown();
}

/* Test if re-activation of an already active channel fails as expected */
function f_TC_chan_act_react(charstring id) runs on ConnHdlr {
	f_rsl_chan_act(g_pars.chan_mode);
	/* attempt to activate the same lchan again -> expect reject */
	RSL.send(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode));
	alt {
	[] RSL.receive(tr_RSL_CHAN_ACT_ACK(g_chan_nr)) {
		setverdict(fail, "Unexpected CHAN ACT ACK on double activation");
		mtc.stop;
		}
	[] RSL.receive(tr_RSL_CHAN_ACT_NACK(g_chan_nr)) {
		setverdict(pass);
		}
	}
	f_rsl_chan_deact();
}
testcase TC_chan_act_react() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init();
	vc_conn := f_start_handler(refers(f_TC_chan_act_react), pars);
	vc_conn.done;
	f_shutdown();
}

/* Attempt to de-activate a channel that's not active */
function f_TC_chan_deact_not_active(charstring id) runs on ConnHdlr {
	timer T := 3.0;
	RSL.send(ts_RSL_RF_CHAN_REL(g_chan_nr));
	T.start;
	alt {
	[] RSL.receive(tr_RSL_RF_CHAN_REL_ACK(g_chan_nr)) {
		setverdict(pass);
		}
	[] T.timeout {
		setverdict(fail, "Timeout expecting RF_CHAN_REL_ACK");
		mtc.stop;
		}
	}
}
testcase TC_chan_deact_not_active() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init();
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_chan_deact_not_active), pars);
	vc_conn.done;
	f_shutdown();
}

/* attempt to activate channel with wrong RSL Channel Nr IE; expect NACK */
function f_TC_chan_act_wrong_nr(charstring id) runs on ConnHdlr {
	RSL.send(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode));
	alt {
	[] RSL.receive(tr_RSL_CHAN_ACT_ACK(g_chan_nr)) {
		setverdict(fail, "Unexpected CHAN ACT ACK");
		mtc.stop;
		}
	[] RSL.receive(tr_RSL_CHAN_ACT_NACK(g_chan_nr)) {
		setverdict(pass);
		}
	}
}
private type record WrongChanNrCase {
	RslChannelNr	chan_nr,
	charstring	description
}
private type record of WrongChanNrCase WrongChanNrCases;
private template WrongChanNrCase t_WCN(template RslChannelNr chan_nr, charstring desc) := {
	chan_nr := chan_nr,
	description := desc
}

testcase TC_chan_act_wrong_nr() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;

	f_init();

	var WrongChanNrCases wrong := {
		valueof(t_WCN(t_RslChanNr_RACH(0), "RACH is not a dedicated channel")),
		valueof(t_WCN(t_RslChanNr_RACH(1), "RACH doesn't exist on timeslot")),
		valueof(t_WCN(t_RslChanNr_BCCH(0), "BCCH is not a dedicated channel")),
		valueof(t_WCN(t_RslChanNr_PCH_AGCH(0), "PCH/AGCH is not a dedicated channel")),
		valueof(t_WCN(t_RslChanNr_Bm(0), "TS0 cannot be TCH/F")),
		valueof(t_WCN(t_RslChanNr_Lm(0, 0), "TS0 cannot be TCH/H")),
		valueof(t_WCN(t_RslChanNr_Lm(0, 1), "TS0 cannot be TCH/H")),
		valueof(t_WCN(t_RslChanNr_PDCH(0), "TS0 cannot be PDCH")),
		valueof(t_WCN(t_RslChanNr_SDCCH8(0, 0), "TS0 cannot be SDCCH/8")),
		valueof(t_WCN(t_RslChanNr_SDCCH8(0, 7), "TS0 cannot be SDCCH/8")),
		valueof(t_WCN(t_RslChanNr_SDCCH4(7, 0), "TS7 cannot be SDCCH/4")),
		valueof(t_WCN(t_RslChanNr_SDCCH4(7, 3), "TS7 cannot be SDCCH/4")),
		valueof(t_WCN(t_RslChanNr_Lm(1, 0), "TS1 cannot be TCH/H"))
	};

	for (var integer i := 0; i < sizeof(wrong); i := i+1) {
		pars := valueof(t_Pars(wrong[i].chan_nr, ts_RSL_ChanMode_SIGN));
		vc_conn := f_start_handler(refers(f_TC_chan_act_wrong_nr), pars);
		vc_conn.done;
	}
	f_shutdown();
}

/* execute the same callback function on a variety of logical channels */
private function f_testmatrix_each_chan(ConnHdlrPars pars, void_fn fn) runs on test_CT {
	var ConnHdlr vc_conn;
	f_init(testcasename());

	/* test on each of the channels we have */
	for (var integer i := 0; i < sizeof(g_AllChanTypes); i := i+1) {
		pars.chan_nr := valueof(g_AllChanTypes[i]);

		log(testcasename(), ": XXX Starting on ", g_AllChanTypes[i]);
		vc_conn := f_start_handler(fn, pars);
		vc_conn.done;
	}

	f_shutdown();
}

/***********************************************************************
 * SACCH handling
 ***********************************************************************/

private function f_exp_sacch(boolean exp) runs on ConnHdlr {
	timer T_sacch := 3.0;
	T_sacch.start;
	alt {
	[not exp] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_SACCH(0))) {
		setverdict(fail, "Received SACCH when not expecting it");
		mtc.stop;
		}
	[not exp] T_sacch.timeout {
		setverdict(pass);
		}
	[exp] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_SACCH(0))) {
		setverdict(pass);
		}
	[exp] T_sacch.timeout {
		setverdict(fail, "Timeout waiting for SACCH on ", g_chan_nr);
		mtc.stop;
		}
	[] L1CTL.receive { repeat; }
	[] RSL.receive { repeat; }
	}
}

/* Test if DEACTIVATE SACCH actualy deactivates its transmission (TS 48.058 4.6) */
private function f_TC_deact_sacch(charstring id) runs on ConnHdlr {
	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* check that SACCH actually are received as expected */
	f_exp_sacch(true);

	/* deactivate SACCH on the logical channel */
	RSL.send(ts_RSL_DEACT_SACCH(g_chan_nr));
	f_sleep(1.0);
	L1CTL.clear;

	/* check that no SACCH are received anymore */
	f_exp_sacch(false);

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}
testcase TC_deact_sacch() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init();
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i+1) {
	//for (var integer i := 0; i < 1; i := i+1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN));
		log(testcasename(), ": Starting for ", g_AllChannels[i]);
		vc_conn := f_start_handler(refers(f_TC_deact_sacch), pars);
		vc_conn.done;
	}
	/* TODO: do the above in parallel, rather than sequentially? */
	f_shutdown();
}

/* verify that given SACCH payload is present */
private function f_sacch_present(template octetstring l3_exp) runs on ConnHdlr {
	var L1ctlDlMessage dl;
	/* check that the specified SI5 value is actually sent */
	timer T_sacch := 3.0;
	L1CTL.clear;
	T_sacch.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_SACCH(0))) -> value dl {
		var octetstring l3 := substr(dl.payload.data_ind.payload, 4, 19);
		if (match(l3, l3_exp)) {
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] L1CTL.receive { repeat; }
	[] T_sacch.timeout {
		setverdict(fail, "Timeout waiting for SACCH ", l3_exp);
		mtc.stop;
		}
	}
}

/* verify that given SACCH payload is not present */
private function f_sacch_missing(template octetstring l3_exp) runs on ConnHdlr {
	var L1ctlDlMessage dl;
	/* check that the specified SI5 value is actually sent */
	timer T_sacch := 3.0;
	L1CTL.clear;
	T_sacch.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_SACCH(0))) -> value dl {
		var octetstring l3 := substr(dl.payload.data_ind.payload, 4, 19);
		if (match(l3, l3_exp)) {
			setverdict(fail, "Received unexpected SACCH ", dl);
			mtc.stop;
		} else {
			repeat;
		}
		}
	[] L1CTL.receive { repeat; }
	[] T_sacch.timeout {
		setverdict(pass);
		}
	}
}

/* Test for default SACCH FILL transmitted in DL SACCH (all channel types) */
private function f_TC_sacch_filling(charstring id) runs on ConnHdlr {
	/* Set a known default SACCH filling for SI5 */
	var octetstring si5 := f_rnd_octstring(19);
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5, si5));

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();

	/* check that the specified SI5 value is actually sent */
	f_sacch_present(si5);

	/* release the channel */
	RSL.clear;
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}
testcase TC_sacch_filling() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init();
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i+1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN));
		log(testcasename(), ": Starting for ", g_AllChannels[i]);
		vc_conn := f_start_handler(refers(f_TC_sacch_filling), pars);
		vc_conn.done;
	}
	/* TODO: do the above in parallel, rather than sequentially? */
	f_shutdown();
}

/* Test for lchan-specific SACCH INFO MODIFY (TS 48.058 4.12) */
private function f_TC_sacch_info_mod(charstring id) runs on ConnHdlr {
	/* Set a known default SACCH filling for SI5 */
	var octetstring si5 := f_rnd_octstring(19);
	var octetstring si5_diff := f_rnd_octstring(19);
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5, si5));

	f_l1_tune(L1CTL);
	RSL.clear;

	log("Activating channel, expecting standard SI5");
	/* activate the logical channel */
	f_est_dchan();
	/* check that the specified SI5 value is actually sent */
	f_sacch_present(si5);

	/* set channel-specific different SI5 */
	log("Setting channel specific SACCH INFO, expecting it");
	RSL.send(ts_RSL_SACCH_INF_MOD(g_chan_nr, RSL_SYSTEM_INFO_5, si5_diff))
	/* check that the specified lchan-specific value is now used */
	f_sacch_present(si5_diff);

	/* deactivate the channel and re-activate it, this should result in default SI5  */
	log("De-activating and re-activating channel, expecting standard SI5");
	f_rsl_chan_deact();
	f_rsl_chan_act(valueof(ts_RSL_ChanMode_SIGN));
	/* Verify that the TRX-wide default SACCH filling is present again */
	f_sacch_present(si5);

	/* release the channel */
	RSL.clear;
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}
testcase TC_sacch_info_mod() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init();
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i+1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN));
		log(testcasename(), ": Starting for ", g_AllChannels[i]);
		vc_conn := f_start_handler(refers(f_TC_sacch_info_mod), pars);
		vc_conn.done;
	}
	/* TODO: do the above in parallel, rather than sequentially? */
	f_shutdown();
}

/* Test SACCH scheduling of multiple different SI message types */
private function f_TC_sacch_multi(charstring id) runs on ConnHdlr {
	var octetstring si5 := f_rnd_octstring(19);
	var octetstring si5bis := f_rnd_octstring(19);
	var octetstring si5ter := f_rnd_octstring(19);
	var octetstring si6 := f_rnd_octstring(19);

	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5, si5));
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5bis, si5bis));
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5ter, si5ter));
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_6, si6));

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* check that SACCH actually are received as expected */
	f_sacch_present(si5);
	f_sacch_present(si5bis);
	f_sacch_present(si5ter);
	f_sacch_present(si6);

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}
testcase TC_sacch_multi() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init();
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i+1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN));
		log(testcasename(), ": Starting for ", g_AllChannels[i]);
		vc_conn := f_start_handler(refers(f_TC_sacch_multi), pars);
		vc_conn.done;
	}
	/* TODO: do the above in parallel, rather than sequentially? */
	f_shutdown();
}

/* Test if SACH information is modified as expected */
private function f_TC_sacch_multi_chg(charstring id) runs on ConnHdlr {
	var octetstring si5 := f_rnd_octstring(19);
	var octetstring si6 := f_rnd_octstring(19);

	/* First, configure both SI5 and SI6 to be transmitted */
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_5, si5));
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_6, si6));

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* check that SACCH actually are received as expected */
	f_sacch_present(si5);
	f_sacch_present(si6);

	/* disable SI6 */
	RSL.send(ts_RSL_SACCH_FILL(RSL_SYSTEM_INFO_6, ''O));

	/* check that SI5 is still transmitted */
	f_sacch_present(si5);
	/* check if SI6 is now gone */
	f_sacch_missing(si6);

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}
testcase TC_sacch_multi_chg() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init();
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i+1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN));
		log(testcasename(), ": Starting for ", g_AllChannels[i]);
		vc_conn := f_start_handler(refers(f_TC_sacch_multi_chg), pars);
		vc_conn.done;
	}
	/* TODO: do the above in parallel, rather than sequentially? */
	f_shutdown();
}

/* TODO: Test for SACCH information present in RSL CHAN ACT (overrides FILLING) */
/* TODO: Test for SACCH transmission rules in the context of special CHAN ACT (HO) */


/***********************************************************************
 * RACH Handling
 ***********************************************************************/

/* like L1SAP_IS_PACKET_RACH */
private function ra_is_ps(OCT1 ra) return boolean {
	if ((ra and4b 'F0'O == '70'O) and (ra and4b '0F'O != '0F'O)) {
		return true;
	}
	return false;
}

/* generate a random RACH for circuit-switched */
private function f_rnd_ra_cs() return OCT1 {
	var OCT1 ra;
	do {
		ra := f_rnd_octstring(1);
	} while (ra_is_ps(ra));
	return ra;
}

/* generate a random RACH for packet-switched */
private function f_rnd_ra_ps() return OCT1 {
	var OCT1 ra;
	do {
		ra := f_rnd_octstring(1);
	} while (not ra_is_ps(ra));
	return ra;
}

/* Send 1000 RACH requests and check their RA+FN on the RSL side */
testcase TC_rach_content() runs on test_CT {
	f_init(testcasename());
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	var GsmFrameNumber fn_last := 0;
	for (var integer i := 0; i < 1000; i := i+1) {
		var OCT1 ra := f_rnd_ra_cs();
		var GsmFrameNumber fn := f_L1CTL_RACH(L1CTL, oct2int(ra));
		if (fn == fn_last) {
			setverdict(fail, "Two RACH in same FN?!?");
			mtc.stop;
		}
		fn_last := fn;

		timer T := 5.0;
		T.start;
		alt {
		[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(ra, fn, ?))) {
			T.stop;
			}
		[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(?, ?, ?))) {
			setverdict(fail, "Unexpected CHAN RQD");
			mtc.stop;
			}
		[] RSL_CCHAN.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for CHAN RQD");
			mtc.stop;
			}
		}
	}
	setverdict(pass);
	f_shutdown();
}

/* Send 1000 RACH Requests (flood ~ 89/s) and count if count(Abis) == count(Um) */
testcase TC_rach_count() runs on test_CT {
	f_init();
	f_init_l1ctl();
	f_sleep(1.0);
	f_l1_tune(L1CTL);

	var GsmFrameNumber fn_last := 0;
	for (var integer i := 0; i < 1000; i := i+1) {
		var OCT1 ra := f_rnd_ra_cs();
		var GsmFrameNumber fn := f_L1CTL_RACH(L1CTL, oct2int(ra));
		if (fn == fn_last) {
			setverdict(fail, "Two RACH in same FN?!?");
			mtc.stop;
		}
		fn_last := fn;
	}
	var integer rsl_chrqd := 0;
	timer T := 3.0;
	T.start;
	alt {
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(?,?))) {
		rsl_chrqd := rsl_chrqd + 1;
		f_timer_safe_restart(T);
		repeat;
		}
	[] RSL_CCHAN.receive { repeat; }
	[] T.timeout { }
	}
	if (rsl_chrqd == 1000) {
		setverdict(pass);
	} else {
		setverdict(fail, "Received only ", rsl_chrqd, " out of 1000 RACH");
	}
	f_shutdown();
}

private function f_main_trxc_connect() runs on test_CT {
	map(self:BB_TRXC, system:BB_TRXC);
	var Result res;
	res := TRXC_CodecPort_CtrlFunct.f_IPL4_connect(BB_TRXC, mp_bb_trxc_ip, mp_bb_trxc_port,
							"", -1, -1, {udp:={}}, {});
	if (not ispresent(res.connId)) {
		setverdict(fail, "Could not connect to trx-control interface of trxcon, check your configuration");
		mtc.stop;
	}
	g_bb_trxc_conn_id := res.connId;
}

private function f_rach_toffs(int16_t toffs256, boolean expect_pass) runs on test_CT {
	var TrxcMessage ret;
	/* tell fake_trx to use a given timing offset for all bursts */
	ret := f_TRXC_transceive(BB_TRXC, g_bb_trxc_conn_id, valueof(ts_TRXC_FAKE_TIMING(toffs256)));
	f_sleep(0.5);

	/* Transmit RACH request + wait for confirmation */
	var OCT1 ra := f_rnd_ra_cs();
	var GsmFrameNumber fn := f_L1CTL_RACH(L1CTL, oct2int(ra));

	/* Check for expected result */
	timer T := 1.5;
	T.start;
	alt {
	[expect_pass] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(ra, fn))) {
		setverdict(pass);
		}
	[not expect_pass] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_CHAN_RQD(ra, fn))) {
		setverdict(fail, "RACH passed but was expected to be dropped: ", toffs256);
		mtc.stop;
		}
	[] RSL_CCHAN.receive { repeat; }
	[not expect_pass] T.timeout {
		setverdict(pass);
		}
	[expect_pass] T.timeout {
		setverdict(fail, "Timeout waiting for CHAN RQD");
		mtc.stop;
		}
	}
}

/* Test if dropping of RACH Based on NM_ATT_MAX_TA works */
testcase TC_rach_max_ta() runs on test_CT {
	f_init(testcasename());
	f_init_l1ctl();
	f_l1_tune(L1CTL);
	f_sleep(1.0);

	/* default max-ta is 63 (full range of GSM timing advance */

	/* We allow early arrival up to 2 symbols */
	f_rach_toffs(-1*256, true);
	f_rach_toffs(-2*256, true);
	f_rach_toffs(-10*256, false);

	/* 0 / 32 / 63 bits is legal / permitted */
	f_rach_toffs(0, true);
	f_rach_toffs(32*256, true);
	f_rach_toffs(63*256, true);

	/* more than 63 bits is not legal / permitted */
	f_rach_toffs(64*256, false);
	f_rach_toffs(127*256, false);
	f_shutdown();
}

/***********************************************************************
 * Measurement Processing / Reporting
 ***********************************************************************/

template LapdmAddressField ts_LapdmAddr(LapdmSapi sapi, boolean c_r) := {
	spare := '0'B,
	lpd := 0,
	sapi := sapi,
	c_r := c_r,
	ea := true
}

template LapdmFrameAB ts_LAPDm_AB(LapdmSapi sapi, boolean c_r, boolean p, octetstring pl) := {
	addr := ts_LapdmAddr(sapi, c_r),
	ctrl := ts_LapdmCtrlUI(p),
	len := 0, /* overwritten */
	m := false,
	el := 1,
	payload := pl
}

/* handle incoming downlink SACCH and respond with uplink SACCH (meas res) */
altstep as_l1_sacch() runs on ConnHdlr {
	var L1ctlDlMessage l1_dl;
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_SACCH(?))) -> value l1_dl {
		log("SACCH received: ", l1_dl.payload.data_ind.payload);
		var GsmRrL3Message meas_rep := valueof(ts_MEAS_REP(true, 23, 23, 0, 0, omit));
		var LapdmFrameAB lb := valueof(ts_LAPDm_AB(0, false, false, enc_GsmRrL3Message(meas_rep)));
		log("LAPDm: ", lb);

		var L1ctlDataReq data_req := {
			l1header := valueof(ts_SacchL1Header(g_pars.l1_pars.ms_power_level, false, g_pars.l1_pars.ms_actual_ta)),
			l2_payload := f_pad_oct(enc_LapdmFrameAB(lb), 21, '2B'O)
		}
		log("Sending Measurement Report: ", data_req);
		L1CTL.send(ts_L1CTL_DATA_REQ_SACCH(g_chan_nr, ts_RslLinkID_SACCH(0), data_req));
		repeat;
		}
}

altstep as_l1_dcch() runs on ConnHdlr {
	var L1ctlDlMessage l1_dl;
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, tr_RslLinkID_DCCH(?))) -> value l1_dl {
		log("DCCH received: ", l1_dl.payload.data_ind.payload);
		var octetstring pl := '010301'O;
		L1CTL.send(ts_L1CTL_DATA_REQ(g_chan_nr, ts_RslLinkID_DCCH(0),
			f_pad_oct(pl, 23, '2B'O)));
		repeat;
		}
}

type record MeasElem {
	uint6_t rxlev,
	uint3_t rxqual
}

type record MeasElemFS {
	MeasElem full,
	MeasElem sub
}

type record ConnL1Pars {
	boolean dtx_enabled,
	boolean toa256_enabled,
	MeasElemFS meas_ul,
	int16_t timing_offset_256syms,
	uint5_t bs_power_level,
	uint5_t ms_power_level,
	uint8_t ms_actual_ta
}

/* Convert tiing offset from 1/256th symbol to RSL Timing Offset */
private function toffs256s_to_rsl(int16_t toffs256s) return uint8_t {
	return 63 + (toffs256s/256);
}

private function f_max(integer a, integer b) return integer {
	if (a > b) {
		return a;
	} else {
		return b;
	}
}

private function f_min(integer a, integer b) return integer {
	if (a < b) {
		return a;
	} else {
		return b;
	}
}

/* compute negative tolerance val-tolerance, ensure >= min */
private function f_tolerance_neg(integer val, integer min, integer tolerance) return integer {
	val := val - tolerance;
	return f_max(val, min);
}

/* compute positive tolerance val+tolerance, ensure <= max */
private function f_tolerance_pos(integer val, integer max, integer tolerance) return integer {
	val := val + tolerance;
	return f_min(val, max);
}

/* return a template of (val-tolerance .. val+tolerance) ensuring it is within (min .. max) */
private function f_tolerance(integer val, integer min, integer max, integer tolerance)
return template integer {
	var template integer ret;
	ret := (f_tolerance_neg(val, min, tolerance) .. f_tolerance_pos(val, max, tolerance));
	return ret;
}


/* build a template for matching measurement results against */
private function f_build_meas_res_tmpl() runs on ConnHdlr return template RSL_Message {
	var ConnL1Pars l1p := g_pars.l1_pars;
	var template RSL_IE_UplinkMeas ul_meas := {
		len := 3,
		rfu := '0'B,
		dtx_d := l1p.dtx_enabled,
		rxlev_f_u := f_tolerance(l1p.meas_ul.full.rxlev, 0, 63, mp_tolerance_rxlev),
		reserved1 := '00'B,
		rxlev_s_u := f_tolerance(l1p.meas_ul.sub.rxlev, 0, 63, mp_tolerance_rxlev),
		reserved2 := '00'B,
		rxq_f_u := f_tolerance(l1p.meas_ul.full.rxqual, 0, 7, mp_tolerance_rxqual),
		rxq_s_u := f_tolerance(l1p.meas_ul.sub.rxqual, 0, 7, mp_tolerance_rxqual),
		supp_meas_info := omit
	};
	if (l1p.toa256_enabled) {
		ul_meas.len := (3+8);
		ul_meas.supp_meas_info := {
			toa256_mean := f_tolerance(l1p.timing_offset_256syms, -63*256, 192*256, mp_tolerance_timing_offset_256syms),
			toa256_min := ?,
			toa256_max := ?,
			toa256_std_dev := ?
		}
	}
	/* HACK HACK HACK FIXME HACK HACK HACK see https://osmocom.org/issues/2988 */
	ul_meas.rxlev_f_u := ?;
	ul_meas.rxlev_s_u := ?;
	ul_meas.rxq_f_u := ?;
	ul_meas.rxq_s_u := ?;
	var template RSL_IE_BS_Power bs_power := {
		reserved := 0,
		epc := false,
		fpc := false,
		power_level := l1p.bs_power_level
	};
	var template RSL_IE_L1Info l1_info := {
		ms_power_lvl := l1p.ms_power_level,
		fpc := false,
		reserved := 0,
		actual_ta := f_tolerance(l1p.ms_actual_ta, 0, 63, mp_tolerance_timing_offset_256syms/256)
	};
	var uint8_t offs := toffs256s_to_rsl(l1p.timing_offset_256syms);
	var template uint8_t t_toffs := f_tolerance(offs, 0, 255, mp_tolerance_timing_offset_256syms/256);
	return tr_RSL_MEAS_RES_OSMO(g_chan_nr, g_next_meas_res_nr, ul_meas, bs_power, l1_info,
				    ?, t_toffs);
}

/* verify we regularly receive measurement reports with incrementing numbers */
altstep as_meas_res(boolean verify_meas := true) runs on ConnHdlr {
	var RSL_Message rsl;
	[not verify_meas] RSL.receive(tr_RSL_MEAS_RES(?)) { repeat; }
	[] RSL.receive(f_build_meas_res_tmpl()) -> value rsl {
		/* increment counter of next to-be-expected meas rep */
		g_next_meas_res_nr := (g_next_meas_res_nr + 1) mod 256;
		/* Re-start the timer expecting the next MEAS RES */
		f_timer_safe_restart(g_Tmeas_exp);
		repeat;
		}
	[] RSL.receive(tr_RSL_MEAS_RES(g_chan_nr, g_next_meas_res_nr)) -> value rsl {
		/* increment counter of next to-be-expected meas rep */
		g_next_meas_res_nr := (g_next_meas_res_nr + 1) mod 256;
		if (g_first_meas_res) {
			g_first_meas_res := false;
			repeat;
		} else {
			setverdict(fail, "Received unspecific MEAS RES ", rsl);
			mtc.stop;
		}
		}
	[] RSL.receive(tr_RSL_MEAS_RES(?)) -> value rsl {
		setverdict(fail, "Received unexpected MEAS RES ", rsl);
		mtc.stop;
		}
	[g_Tmeas_exp.running] g_Tmeas_exp.timeout {
		setverdict(fail, "Didn't receive expected measurement result")
		mtc.stop;
		}
}

private function f_alg_id_to_l1ctl(RSL_AlgId rsl_alg_id) return uint8_t {
	select (rsl_alg_id) {
	case (RSL_ALG_ID_A5_0) { return 0; }
	case (RSL_ALG_ID_A5_1) { return 1; }
	case (RSL_ALG_ID_A5_2) { return 2; }
	case (RSL_ALG_ID_A5_3) { return 3; }
	case (RSL_ALG_ID_A5_4) { return 4; }
	case (RSL_ALG_ID_A5_5) { return 5; }
	case (RSL_ALG_ID_A5_6) { return 6; }
	case (RSL_ALG_ID_A5_7) { return 7; }
	case else {
		setverdict(fail, "Unknwon Algorithm ID");
		mtc.stop;
		}
	}
}

private function f_alg_id_to_l3(RSL_AlgId rsl_alg_id) return BIT3 {
	select (rsl_alg_id) {
	case (RSL_ALG_ID_A5_1) { return '000'B; }
	case (RSL_ALG_ID_A5_2) { return '001'B; }
	case (RSL_ALG_ID_A5_3) { return '010'B; }
	case (RSL_ALG_ID_A5_4) { return '011'B; }
	case (RSL_ALG_ID_A5_5) { return '100'B; }
	case (RSL_ALG_ID_A5_6) { return '101'B; }
	case (RSL_ALG_ID_A5_7) { return '110'B; }
	case else {
		setverdict(fail, "Unknwon Algorithm ID");
		mtc.stop;
		}
	}
}


/* Establish dedicated channel: L1CTL + RSL side */
private function f_est_dchan(boolean encr_enable := false) runs on ConnHdlr {
	var GsmFrameNumber fn;
	var ImmediateAssignment imm_ass;
	var integer ra := 23;

	f_L1CTL_PARAM(L1CTL, g_pars.l1_pars.ms_actual_ta, g_pars.l1_pars.ms_power_level);
	fn := f_L1CTL_RACH(L1CTL, ra);
	/* This arrives on CCHAN, so we cannot test for receiving CHAN RQDhere */
	//RSL.receive(tr_RSL_CHAN_RQD(int2oct(23,1)));

	/* Activate channel on BTS side */
	f_rsl_chan_act(g_pars.chan_mode, encr_enable);

	/* Send IMM.ASS via CCHAN */
	var ChannelDescription ch_desc := {
		chan_nr := g_pars.chan_nr,
		tsc := 7,
		h := false,
		arfcn := mp_trx0_arfcn,
		maio_hsn := omit
	};
	var MobileAllocation ma := {
		len := 0,
		ma := ''B
	};
	var GsmRrMessage rr_msg := valueof(ts_IMM_ASS(ra, fn, 0, ch_desc, ma));
	RSL.send(ts_RSL_IMM_ASSIGN(enc_GsmRrMessage(rr_msg)));

	/* receive IMM.ASS on MS side */
	var ImmediateAssignment ia_um;
	ia_um := f_L1CTL_WAIT_IMM_ASS(L1CTL, ra, fn);
	/* enable dedicated mode */
	f_L1CTL_DM_EST_REQ_IA(L1CTL, ia_um);
	/* enable encryption, if requested */
	if (encr_enable) {
		var uint8_t alg_id := f_alg_id_to_l1ctl(g_pars.encr.alg_id);
		f_L1CTL_CRYPTO_REQ(L1CTL, g_pars.chan_nr, alg_id, g_pars.encr.key);
	}

	g_first_meas_res := true;
}

/* establish DChan, verify existance + contents of measurement reports */
function f_TC_meas_res_periodic(charstring id) runs on ConnHdlr {
	f_l1_tune(L1CTL);
	RSL.clear;

	g_pars.l1_pars.meas_ul.full.rxlev := dbm2rxlev(-100);
	g_pars.l1_pars.meas_ul.sub.rxlev := g_pars.l1_pars.meas_ul.full.rxlev;
	if (mp_bb_trxc_port != -1) {
		f_trxc_fake_rssi(100);
		f_trx_fake_toffs256(g_pars.l1_pars.timing_offset_256syms);
	}

	f_est_dchan();

	/* run for a number of seconds, send SACCH + FACCH from MS side and verify
	 * RSL measurement reports on Abis side */
	timer T := 8.0;
	T.start;
	alt {
	[] as_l1_sacch();
	[] as_meas_res();
	[] as_l1_dcch();
	[] L1CTL.receive { repeat; }
	[g_Tmeas_exp.running] T.timeout {
		/* as_meas_res() would have done setverdict(fail) / mtc.stop in case
		 * of any earlier errors, so if we reach this timeout, we're good */
		setverdict(pass);
		}
	[] T.timeout {
		setverdict(fail, "No MEAS RES received at all");
		mtc.stop;
		}
	}
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
}

testcase TC_meas_res_sign_tchf() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	for (var integer tn := 1; tn <= 4; tn := tn+1) {
		pars := valueof(t_Pars(t_RslChanNr_Bm(tn), ts_RSL_ChanMode_SIGN));
		vc_conn := f_start_handler(refers(f_TC_meas_res_periodic), pars);
		vc_conn.done;
	}
	f_shutdown();
}
testcase TC_meas_res_sign_tchh() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	for (var integer ss := 0; ss <= 1; ss := ss+1) {
		pars := valueof(t_Pars(t_RslChanNr_Lm(5, ss), ts_RSL_ChanMode_SIGN));
		vc_conn := f_start_handler(refers(f_TC_meas_res_periodic), pars);
		vc_conn.done;
	}
	f_shutdown();
}
testcase TC_meas_res_sign_sdcch4() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	for (var integer ss := 0; ss <= 3; ss := ss+1) {
		pars := valueof(t_Pars(t_RslChanNr_SDCCH4(0, ss), ts_RSL_ChanMode_SIGN));
		vc_conn := f_start_handler(refers(f_TC_meas_res_periodic), pars);
		vc_conn.done;
	}
	f_shutdown();
}
testcase TC_meas_res_sign_sdcch8() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	for (var integer ss := 0; ss <= 7; ss := ss+1) {
		pars := valueof(t_Pars(t_RslChanNr_SDCCH8(6, ss), ts_RSL_ChanMode_SIGN));
		vc_conn := f_start_handler(refers(f_TC_meas_res_periodic), pars);
		vc_conn.done;
	}
	f_shutdown();
}
testcase TC_meas_res_sign_tchh_toa256() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	f_vty_config(BTSVTY, "bts 0", "supp-meas-info toa256");
	for (var integer ss := 0; ss <= 1; ss := ss+1) {
		pars := valueof(t_Pars(t_RslChanNr_Lm(5, ss), ts_RSL_ChanMode_SIGN));
		pars.l1_pars.toa256_enabled := true;
		vc_conn := f_start_handler(refers(f_TC_meas_res_periodic), pars);
		vc_conn.done;
	}
	f_shutdown();
}


/* Test if a channel without valid uplink bursts generates RSL CONN FAIL IND (TS 48.058 4.10) */
private function f_TC_conn_fail_crit(charstring id) runs on ConnHdlr {
	f_l1_tune(L1CTL);
	RSL.clear;

	f_est_dchan();
	f_sleep(2.0);
	L1CTL.send(ts_L1CTL_DM_REL_REQ(g_chan_nr));

	timer T := 40.0;
	T.start;
	alt {
	[] RSL.receive(tr_RSL_CONN_FAIL_IND(g_chan_nr, ?)) {
		setverdict(pass)
		}
	[] RSL.receive { repeat };
	[] T.timeout {
		setverdict(fail, "No CONN FAIL IND received");
		mtc.stop;
		}
	}
	f_rsl_chan_deact();
}
testcase TC_conn_fail_crit() runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	f_init(testcasename());
	pars := valueof(t_Pars(t_RslChanNr_SDCCH8(6, 3), ts_RSL_ChanMode_SIGN));
	pars.t_guard := 60.0;
	vc_conn := f_start_handler(refers(f_TC_conn_fail_crit), pars);
	vc_conn.done;
}

/***********************************************************************
 * Paging
 ***********************************************************************/

function tmsi_is_dummy(TMSIP_TMSI_V tmsi) return boolean {
	if (tmsi == 'FFFFFFFF'O) {
		return true;
	} else {
		return false;
	}
}

type record allowedFn { integer frame_nr }
template allowedFn bs_ag_blks_res_0  := { frame_nr := (6, 12, 16, 22, 26, 32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_1  := { frame_nr := (12, 16, 22, 26, 32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_2  := { frame_nr := (16, 22, 26, 32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_3  := { frame_nr := (22, 26, 32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_4  := { frame_nr := (26, 32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_5  := { frame_nr := (32, 36, 42, 46) }
template allowedFn bs_ag_blks_res_6  := { frame_nr := (36, 42, 46) }
template allowedFn bs_ag_blks_res_7  := { frame_nr := (42, 46) }
function check_pch_fn(integer frame_nr, integer bs_ag_blks_res) runs on test_CT
{
	var integer frame_nr_51;
	frame_nr_51 := frame_nr mod 51

	var allowedFn fn_check;
	fn_check.frame_nr := frame_nr_51;

	if (bs_ag_blks_res < 0 or bs_ag_blks_res > 7) {
		setverdict(fail, "bs_ag_blks_res out of valid range (0..7)");
		mtc.stop;
		return;
	}

	if (bs_ag_blks_res == 0 and match(fn_check, bs_ag_blks_res_0)) {
		return;
	}
	if (bs_ag_blks_res == 1 and match(fn_check, bs_ag_blks_res_1)) {
		return;
	}
	if (bs_ag_blks_res == 2 and match(fn_check, bs_ag_blks_res_2)) {
		return;
	}
	if (bs_ag_blks_res == 3 and match(fn_check, bs_ag_blks_res_3)) {
		return;
	}
	if (bs_ag_blks_res == 4 and match(fn_check, bs_ag_blks_res_4)) {
		return;
	}
	if (bs_ag_blks_res == 5 and match(fn_check, bs_ag_blks_res_5)) {
		return;
	}
	if (bs_ag_blks_res == 6 and match(fn_check, bs_ag_blks_res_6)) {
		return;
	}
	if (bs_ag_blks_res == 7 and match(fn_check, bs_ag_blks_res_7)) {
		return;
	}

	setverdict(fail, "received paging on AGCH");
	mtc.stop;
	return;
}

altstep as_l1_count_paging(inout integer num_paging_rcv_msgs, inout integer num_paging_rcv_ids, PagingTestCfg cfg)
runs on test_CT {
	var L1ctlDlMessage dl;
	[] L1CTL.receive(tr_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0), ?, c_DummyUI)) {
		repeat;
	}
	[] L1CTL.receive(tr_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0))) -> value dl {
		var octetstring without_plen :=
			substr(dl.payload.data_ind.payload, 1, lengthof(dl.payload.data_ind.payload)-1);
		var PDU_ML3_NW_MS rr := dec_PDU_ML3_NW_MS(without_plen);

		check_pch_fn(dl.dl_info.frame_nr, cfg.bs_ag_blks_res);

		if (match(rr, tr_PAGING_REQ1)) {
			num_paging_rcv_msgs := num_paging_rcv_msgs + 1;
			num_paging_rcv_ids := num_paging_rcv_ids + 1;
			if (isvalue(rr.msgs.rrm.pagingReq_Type1.mobileIdentity2)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
		} else if (match(rr, tr_PAGING_REQ2)) {
			num_paging_rcv_msgs := num_paging_rcv_msgs + 1;
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type2.mobileIdentity1)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type2.mobileIdentity2)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
			if (isvalue(rr.msgs.rrm.pagingReq_Type2.mobileIdentity3)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
		} else if (match(rr, tr_PAGING_REQ3)) {
			num_paging_rcv_msgs := num_paging_rcv_msgs + 1;
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type3.mobileIdentity1)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type3.mobileIdentity2)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type3.mobileIdentity3)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
			if (not tmsi_is_dummy(rr.msgs.rrm.pagingReq_Type3.mobileIdentity4)) {
				num_paging_rcv_ids := num_paging_rcv_ids + 1;
			}
		}
		repeat;
	}
}

type record PagingTestCfg {
	boolean combined_ccch,
	integer bs_ag_blks_res,
	float load_factor,
	boolean exp_load_ind,
	boolean exp_overload,
	boolean use_tmsi
}

type record PagingTestState {
	integer num_paging_sent,
	integer num_paging_rcv_msgs,
	integer num_paging_rcv_ids,
	integer num_overload
}

/* receive + ignore RSL RF RES IND */
altstep as_rsl_res_ind() runs on test_CT {
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_RF_RES_IND)) {
		repeat;
	}
}

/* Helper function for paging related testing */
private function f_TC_paging(PagingTestCfg cfg) runs on test_CT return PagingTestState {
	f_init(testcasename());
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	var PagingTestState st := {
		num_paging_sent := 0,
		num_paging_rcv_msgs := 0,
		num_paging_rcv_ids := 0,
		num_overload := 0
	};

	var float max_pch_blocks_per_sec := f_pch_block_rate_est(cfg.combined_ccch, cfg.bs_ag_blks_res);
	var float max_pch_imsi_per_sec;
	if (cfg.use_tmsi) {
		max_pch_imsi_per_sec := max_pch_blocks_per_sec * 4.0; /* Type 3 */
	} else {
		max_pch_imsi_per_sec := max_pch_blocks_per_sec * 2.0; /* Type 1 */
	}
	var float pch_blocks_per_sec := max_pch_imsi_per_sec * cfg.load_factor;
	var float interval := 1.0 / pch_blocks_per_sec;
	var float time_total := 20.0;
	var integer pkt_total := float2int(time_total * pch_blocks_per_sec);
	log("pch_blocks_total=", pkt_total," pch_blocks_per_sec=", pch_blocks_per_sec, " interval=", interval);

	timer T_total := 300.0; /* big value (far bigger than time_total), used to count elapsed time */
	T_total.start;

	timer T_itv := 0.0;
	T_itv.start;
	while (st.num_paging_sent < pkt_total) {
		alt {
		/* check for presence of CCCH LOAD IND (paging load) */
		[cfg.exp_overload] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_PAGING_LOAD_IND(0))) {
			st.num_overload := st.num_overload + 1;
			repeat;
			}
		[not cfg.exp_overload]  RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_PAGING_LOAD_IND(0))) {
			setverdict(fail, "Unexpected PCH Overload");
			mtc.stop;
			}
		[cfg.exp_load_ind] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_PAGING_LOAD_IND)) {
			log("Rx LOAD_IND");
			/* FIXME: analyze/verify interval + contents */
			repeat;
			}
		/* check if paging requests arrive on Um side */
		[] as_l1_count_paging(st.num_paging_rcv_msgs, st.num_paging_rcv_ids, cfg);
		[] L1CTL.receive { repeat; }
		[] T_itv.timeout {
			/* Send paging cmds based on elapsed time */
			var integer new_sent := f_min(pkt_total, float2int(T_total.read * pch_blocks_per_sec) + 1);
			while (st.num_paging_sent < new_sent) {
				/* build mobile Identity */
				var MobileL3_CommonIE_Types.MobileIdentityLV mi;
				if (cfg.use_tmsi) {
					mi := valueof(ts_MI_TMSI_LV(f_rnd_octstring(4)));
				} else {
					mi := valueof(ts_MI_IMSI_LV(f_gen_imsi(st.num_paging_sent)));
				}
				var octetstring mi_enc_lv := enc_MobileIdentityLV(mi);
				var octetstring mi_enc := substr(mi_enc_lv, 1, lengthof(mi_enc_lv)-1);

				/* Send RSL PAGING COMMAND */
				RSL_CCHAN.send(ts_RSL_UD(ts_RSL_PAGING_CMD(mi_enc, st.num_paging_sent mod 4)));

				st.num_paging_sent := st.num_paging_sent + 1;
			}
			if (st.num_paging_sent < pkt_total) {
				/* Wait for interval to next PAGING COMMAND */
				var float time_now := T_total.read;
				var float next_sched := int2float(st.num_paging_sent)*interval;
				if (next_sched > time_now) {
					T_itv.start(next_sched - time_now);
				} else {
					T_itv.start(0.0);
				}
			} else {
				/* We are done, no need to keep counting */
				T_total.stop;
			}
			}
		[] T_total.timeout { }
		[] as_rsl_res_ind();
		}
	}

	/* wait for max 18s for paging queue to drain (size: 200, ~ 13 per s -> 15s) */
	timer T_wait := 18.0;
	T_wait.start;
	alt {
	[] as_l1_count_paging(st.num_paging_rcv_msgs, st.num_paging_rcv_ids, cfg);
	[] L1CTL.receive { repeat; }
	/* 65535 == empty paging queue, we can terminate*/
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_PAGING_LOAD_IND(65535))) { }
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_PAGING_LOAD_IND)) { repeat; }
	[] T_wait.timeout {
		setverdict(fail, "Waiting for empty paging queue");
		mtc.stop;
		}
	[] as_rsl_res_ind();
	}

	log("num_paging_sent=", st.num_paging_sent, " rcvd_msgs=", st.num_paging_rcv_msgs,
	    " rcvd_ids=", st.num_paging_rcv_ids);
	return st;
}

/* Create ~ 80% paging load (IMSI only) sustained for about 20s, verifying that
 *  - the number of Mobile Identities on Um PCH match the number of pages on RSL
 *  - that CCCH LOAD IND (PCH) are being generated
 *  - that CCCH LOAD IND (PCH) [no load] is received after paging flood is over */
testcase TC_paging_imsi_80percent() runs on test_CT {
	var SystemInformation si3 := valueof(ts_SI3_default);
	var PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := si3.payload.si3.ctrl_chan_desc.bs_ag_blks_res,
		load_factor := 0.8,
		exp_load_ind := true,
		exp_overload := false,
		use_tmsi := false
	};
	var PagingTestState st := f_TC_paging(cfg);
	if (st.num_paging_sent != st.num_paging_rcv_ids) {
		setverdict(fail, "Expected ", st.num_paging_sent, " pagings but have ",
			   st.num_paging_rcv_ids);
	} else {
		setverdict(pass);
	}
	f_shutdown();
}

/* Create ~ 80% paging load (TMSI only) sustained for about 20s, verifying that
 *  - the number of Mobile Identities on Um PCH match the number of pages on RSL
 *  - that CCCH LOAD IND (PCH) are being generated
 *  - that CCCH LOAD IND (PCH) [no load] is received after paging flood is over */
testcase TC_paging_tmsi_80percent() runs on test_CT {
	var SystemInformation si3 := valueof(ts_SI3_default);
	var PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := si3.payload.si3.ctrl_chan_desc.bs_ag_blks_res,
		load_factor := 0.8,
		exp_load_ind := true,
		exp_overload := false,
		use_tmsi := true
	};
	var PagingTestState st := f_TC_paging(cfg);
	if (st.num_paging_sent != st.num_paging_rcv_ids) {
		setverdict(fail, "Expected ", st.num_paging_sent, " pagings but have ",
			   st.num_paging_rcv_ids);
	} else {
		setverdict(pass);
	}
	f_shutdown();
}

/* Create ~ 200% paging load (IMSI only) sustained for about 20s, verifying that
 *  - the number of Mobile Identities on Um PCH are ~ 82% of the number of pages on RSL
 *  - that CCCH LOAD IND (PCH) are being generated and reach 0 at some point
 *  - that CCCH LOAD IND (PCH) [no load] is received after paging flood is over */
testcase TC_paging_imsi_200percent() runs on test_CT {
	var SystemInformation si3 := valueof(ts_SI3_default);
	var PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := si3.payload.si3.ctrl_chan_desc.bs_ag_blks_res,
		load_factor := 2.0,
		exp_load_ind := true,
		exp_overload := true,
		use_tmsi := false
	};
	var PagingTestState st := f_TC_paging(cfg);
	/* We expect about 80-85% to pass, given that we can fill the paging buffer of 200
	 * slots and will fully drain that buffer before returning */
	var template integer tpl := (st.num_paging_sent*78/100 .. st.num_paging_sent *85/100);
	if (not match(st.num_paging_rcv_ids, tpl)) {
		setverdict(fail, "Expected ", tpl, " pagings but have ", st.num_paging_rcv_ids);
	} else {
		setverdict(pass);
	}
	f_shutdown();
}

/* Create ~ 200% paging load (TMSI only) sustained for about 20s, verifying that
 *  - the number of Mobile Identities on Um PCH are ~ 82% of the number of pages on RSL
 *  - that CCCH LOAD IND (PCH) are being generated and reach 0 at some point
 *  - that CCCH LOAD IND (PCH) [no load] is received after paging flood is over */
testcase TC_paging_tmsi_200percent() runs on test_CT {
	var SystemInformation si3 := valueof(ts_SI3_default);
	var PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := si3.payload.si3.ctrl_chan_desc.bs_ag_blks_res,
		load_factor := 2.0,
		exp_load_ind := true,
		exp_overload := true,
		use_tmsi := true
	};
	var PagingTestState st := f_TC_paging(cfg);
	/* We expect about 70% to pass, given that we can fill the paging buffer of 200
	 * slots and will fully drain that buffer before returning */
	var template integer tpl := (st.num_paging_sent*64/100 .. st.num_paging_sent *72/100);
	if (not match(st.num_paging_rcv_ids, tpl)) {
		setverdict(fail, "Expected ", tpl, " pagings but have ", st.num_paging_rcv_ids);
	} else {
		setverdict(pass);
	}
	f_shutdown();
}


/***********************************************************************
 * Immediate Assignment / AGCH
 ***********************************************************************/
const MobileAllocation c_MA_null := {
	len := 0,
	ma := ''B
}

template (value) ChannelDescription ts_ChanDesc(template (value) RslChannelNr chan_nr, uint3_t tsc := 7,
						uint12_t arfcn := 871) := {
	chan_nr := chan_nr,
	tsc := tsc,
	h := false,
	arfcn := arfcn,
	maio_hsn := omit
}

private function f_fmt_ia_stats(integer num_tx, integer num_rx, integer num_del) return charstring {
	return int2str(num_tx) & " sent, "
		  & int2str(num_rx) & " received, "
		  & int2str(num_del) & " deleted";
}

private function f_TC_imm_ass(integer num_total, float sleep_s, float exp_pass) runs on test_CT {
	var L1ctlDlMessage l1_dl;
	timer T := 10.0;
	var integer num_tx := 0;
	var integer num_rx := 0;
	var integer num_del := 0;
	var charstring res_str;
	var float rx_ratio;

	f_init(testcasename());
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	for (var integer i := 0; i < num_total; i := i+1) {
		var ChannelDescription ch_desc := valueof(ts_ChanDesc(valueof(t_RslChanNr_SDCCH4(0, 0))));
		var GsmRrMessage ia := valueof(ts_IMM_ASS(42, i, 5, ch_desc, c_MA_null));
		var octetstring ia_enc := enc_GsmRrMessage(ia);
		RSL_CCHAN.send(ts_RSL_UD(ts_RSL_IMM_ASSIGN(ia_enc, 0)));
		num_tx := num_tx+1;
		f_sleep(sleep_s);
	}
	/* FIXME: check if imm.ass arrive on Um side */
	T.start;
	alt {
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_DELETE_IND(?, 0))) {
		num_del := num_del+1;
		repeat;
		}
	[] RSL_CCHAN.receive {
		repeat;
		}
	[] L1CTL.receive(tr_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0), ?)) -> value l1_dl {
		/* somehow dec_SystemInformation will try to decode even non-RR as SI */
		var GsmRrMessage rr := dec_GsmRrMessage(l1_dl.payload.data_ind.payload);
		if (not match(rr, tr_IMM_ASS(42, ?, 5, ?, ?))) {
			/* FIXME: Why are we seeing paging requests on PCH/AGCH? */
			//setverdict(fail, "Unexpected IMM-ASS values on AGCH: ", rr);
			//mtc.stop;
		} else {
			num_rx := num_rx+1;
		}
		repeat;
		}
	[] L1CTL.receive { repeat; }
	[] T.timeout { }
	}
	res_str := f_fmt_ia_stats(num_tx, num_rx, num_del);
	log("AGCH test: " & res_str);
	if (num_rx + num_del != num_tx) {
		setverdict(fail, "RX + DEL != TX ?!?: " & res_str);
		mtc.stop
	}
	rx_ratio := int2float(num_rx) / int2float(num_tx);
	if (rx_ratio < exp_pass*0.8 or rx_ratio > exp_pass*1.2) {
		setverdict(fail, "RX ratio ("&float2str(rx_ratio)&") far from expected ("&float2str(exp_pass)&") " & res_str);
	} else {
		setverdict(pass);
	}
	f_shutdown();
}

/* send a long burst of 1000 IMM.ASS with 20ms spacing (50 per s); expect 75% of them to be deleted */
testcase TC_imm_ass_1000_20ms() runs on test_CT {
	f_TC_imm_ass(1000, 0.02, 0.25);
}

/* send a short burst of 200 IMM.ASS without any spacing; expect 95% of them to be deleted */
testcase TC_imm_ass_200_0ms() runs on test_CT {
	f_TC_imm_ass(200, 0.0, 0.05);
}

/* send 150 IMM.ASS at rate of 13/s; expect none of them to be deleted */
testcase TC_imm_ass_200_76ms() runs on test_CT {
	f_TC_imm_ass(150, 0.076, 1.00);
}


/***********************************************************************
 * BCCH
 ***********************************************************************/

/* tuple of Frame Number + decoded SI */
type record SystemInformationFn {
	GsmFrameNumber frame_number,
	SystemInformation si
}

/* an arbitrary-length vector of decoded SI + gsmtap header */
type record of SystemInformationFn SystemInformationVector;

/* an array of SI-vectors indexed by TC value */
type SystemInformationVector SystemInformationVectorPerTc[8];

/* determine if a given SI vector contains given SI type at least once */
function f_si_vecslot_contains(SystemInformationVector arr, RrMessageType key, boolean bcch_ext := false) return boolean {
	for (var integer i:= 0; i< sizeof(arr); i := i + 1) {
		var integer fn_mod51 := arr[i].frame_number mod 51;
		if (not bcch_ext and fn_mod51 == 2 or
		        bcch_ext and fn_mod51 == 6) {
			if (arr[i].si.header.message_type == key) {
				return true;
			}
		}
	}
	return false;
}

/* ensure a given TC slot of the SI vector contains given SI type at least once at TC */
function f_ensure_si_vec_contains(SystemInformationVectorPerTc arr, integer tc, RrMessageType key, boolean ext_bcch := false) {
	if (not f_si_vecslot_contains(arr[tc], key, ext_bcch)) {
		setverdict(fail, "No ", key, " in TC=", tc, "!");
		mtc.stop;
	}
}

/* check if a given SI vector contains given SI type at least once on any TC */
function f_si_vec_contains(SystemInformationVectorPerTc arr, RrMessageType key) return boolean {
	for (var integer tc:= 0; tc < sizeof(arr); tc := tc + 1) {
		if (f_si_vecslot_contains(arr[tc], key) or
		    f_si_vecslot_contains(arr[tc], key, true)) {
			return true;
		}
	}
	return false;
}

/* determine if a given SI vector contains given SI type at least N of M times */
function f_si_vecslot_contains_n_of_m(SystemInformationVector arr, RrMessageType key, boolean bcch_ext := false, integer n := 1, integer m := 4) return boolean {
	var integer count := 0;
	if (sizeof(arr) < m) {
		setverdict(fail, "Error: Insufficient SI in array");
		mtc.stop;
	}
	for (var integer i:= 0; i < m; i := i + 1) {
		var integer fn_mod51 := arr[i].frame_number mod 51;
		if (not bcch_ext and fn_mod51 == 2 or
		        bcch_ext and fn_mod51 == 6) {
			if (arr[i].si.header.message_type == key) {
				count := count + 1;
			}
		}
	}
	if (count >= n) {
		return true;
	} else {
		return false;
	}
}

/* ensure a given TC slot of the SI vector contains given SI type at least N out of M times at TC */
function f_ensure_si_vec_contains_n_of_m(SystemInformationVectorPerTc arr, integer tc, RrMessageType key, boolean ext_bcch := false, integer n, integer m) {
	if (not f_si_vecslot_contains_n_of_m(arr[tc], key, ext_bcch, n, m)) {
		setverdict(fail, "Not ", n, "/", m, " of ", key, " in TC=", tc, "!");
		mtc.stop;
	}
}

/* determine if a given SI vector contains given SI type at least once */
function f_si_vecslot_contains_only(SystemInformationVector arr, RrMessageType key, boolean bcch_ext := false) return boolean {
	for (var integer i:= 0; i< sizeof(arr); i := i + 1) {
		var integer fn_mod51 := arr[i].frame_number mod 51;
		if (not bcch_ext and fn_mod51 == 2 or
		        bcch_ext and fn_mod51 == 6) {
			if (arr[i].si.header.message_type != key) {
				return false;
			}
		}
	}
	return true;
}

/* ensure a given TC slot of the SI vector contains only given SI type */
function f_ensure_si_vec_contains_only(SystemInformationVectorPerTc arr, integer tc, RrMessageType key, boolean ext_bcch := false) {
	if (not f_si_vecslot_contains_only(arr[tc], key, ext_bcch)) {
		setverdict(fail, "Not all ", key, " in TC=", tc, "!");
		mtc.stop;
	}
}

/* SI configuration of cell, against which we validate actual SI messages */
type set SystemInformationConfig {
	boolean bcch_extended,
	boolean si1_present,
	boolean si2bis_present,
	boolean si2ter_present,
	boolean si2quater_present,
	boolean si7_present,
	boolean si8_present,
	boolean si9_present,
	boolean si13_present,
	boolean si13alt_present,
	boolean si15_present,
	boolean si16_present,
	boolean si17_present,
	boolean si2n_present,
	boolean si21_present,
	boolean si22_present
}

/* validate the SI scheduling according to TS 45.002 version 14.1.0 Release 14, Section 6.3.1.3 */
function f_validate_si_scheduling(SystemInformationConfig cfg, SystemInformationVectorPerTc si_per_tc) {
	var integer i;
	for (i := 0; i < sizeof(si_per_tc); i := i + 1) {
		if (sizeof(si_per_tc[i]) == 0) {
			setverdict(fail, "No SI messages for TC=", i);
			mtc.stop;
		}
	}
	if (cfg.si1_present) {
		/* ii) System Information Type 1 needs to be sent if frequency hopping is in use or
		 * when the NCH is present in a cell. If the MS finds another message on BCCH Norm
		 * when TC = 0, it can assume that System Information Type 1 is not in use. */
		f_ensure_si_vec_contains(si_per_tc, 0, SYSTEM_INFORMATION_TYPE_1);
		/* make sure *ALL* contain SI1 */
		f_ensure_si_vec_contains_only(si_per_tc, 0, SYSTEM_INFORMATION_TYPE_1);
	}
	f_ensure_si_vec_contains(si_per_tc, 1, SYSTEM_INFORMATION_TYPE_2);
	/* iii) A SI 2 message will be sent at least every time TC = 1 */
	f_ensure_si_vec_contains(si_per_tc, 2, SYSTEM_INFORMATION_TYPE_3);
	f_ensure_si_vec_contains(si_per_tc, 6, SYSTEM_INFORMATION_TYPE_3);
	f_ensure_si_vec_contains(si_per_tc, 3, SYSTEM_INFORMATION_TYPE_4);
	f_ensure_si_vec_contains(si_per_tc, 7, SYSTEM_INFORMATION_TYPE_4);

	/*  iii) System information type 2 bis or 2 ter messages are sent if needed, as determined by the
	 *  system operator. If only one of them is needed, it is sent when TC = 5. If both are
	 *  needed, 2bis is sent when TC = 5 and 2ter is sent at least once within any of 4
	 *  consecutive occurrences of TC = 4. */
	if (cfg.si2bis_present and not cfg.si2ter_present) {
		f_ensure_si_vec_contains(si_per_tc, 5, SYSTEM_INFORMATION_TYPE_2bis);
	} else if (cfg.si2ter_present and not cfg.si2bis_present) {
		f_ensure_si_vec_contains(si_per_tc, 5, SYSTEM_INFORMATION_TYPE_2ter);
	} else if (cfg.si2ter_present and cfg.si2bis_present) {
		f_ensure_si_vec_contains(si_per_tc, 5, SYSTEM_INFORMATION_TYPE_2bis);
		f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_2ter, false, 1, 4);
	}

	if (cfg.si7_present or cfg.si8_present) {
		/* vi) Use of System Information type 7 and 8 is not always necessary. It is necessary
		 * if System Information type 4 does not contain all information needed for cell
		 * selection and reselection. */
		if (not cfg.bcch_extended) {
			testcase.stop("Error: SI7/SI8 require BCCH Extd.");
		}
		if (cfg.si7_present) {
			f_ensure_si_vec_contains(si_per_tc, 7, SYSTEM_INFORMATION_TYPE_7, true);
		}
		if (cfg.si8_present) {
			f_ensure_si_vec_contains(si_per_tc, 3, SYSTEM_INFORMATION_TYPE_8, true);
		}
	}

	if (cfg.si2quater_present) {
		/*  iii) System information type 2 quater is sent if needed, as determined by the system
		 *  operator.  If sent on BCCH Norm, it shall be sent when TC = 5 if neither of 2bis
		 *  and 2ter are used, otherwise it shall be sent at least once within any of 4
		 *  consecutive occurrences of TC = 4. If sent on BCCH Ext, it is sent at least once
		 *  within any of 4 consecutive occurrences of TC = 5. */
		if (not (cfg.bcch_extended)) {
			if (not (cfg.si2bis_present or cfg.si2ter_present)) {
				f_ensure_si_vec_contains(si_per_tc, 5, SYSTEM_INFORMATION_TYPE_2quater);
			} else {
				f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_2quater, false, 1, 4);
			}
		} else {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 5, SYSTEM_INFORMATION_TYPE_2quater, true, 1, 4);
		}
	}
	if (cfg.si9_present) {
		/* vi) System Information type 9 is sent in those blocks with TC = 4 which are specified
		 * in system information type 3 as defined in 3GPP TS 44.018. */
		f_ensure_si_vec_contains(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_9); // FIXME SI3
	}
	if (cfg.si13_present) {
		/* vii) System Information type 13 is only related to the GPRS service. System Information
		 * Type 13 need only be sent if GPRS support is indicated in one or more of System
		 * Information Type 3 or 4 or 7 or 8 messages. These messages also indicate if the
		 * message is sent on the BCCH Norm or if the message is transmitted on the BCCH Ext.
		 * In the case that the message is sent on the BCCH Norm, it is sent at least once
		 * within any of 4 consecutive occurrences of TC=4. */
		if (not cfg.bcch_extended) {
			log("not-bccch-extended");
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_13, false, 1, 4);
		} else {
			log("bccch-extended");
			f_ensure_si_vec_contains(si_per_tc, 0, SYSTEM_INFORMATION_TYPE_13, true);
		}
		if (f_si_vec_contains(si_per_tc, SYSTEM_INFORMATION_TYPE_13alt)) {
			setverdict(fail, "Cannot have SI13alt and SI13");
			mtc.stop;
		}
	}
	if (cfg.si16_present or cfg.si17_present) {
		/* viii) System Information type 16 and 17 are only related to the SoLSA service. They
		 * should not be sent in a cell where network sharing is used (see rule xv). */
		if (cfg.si22_present) {
			testcase.stop("Error: Cannot have SI16/SI17 and SI22!");
		}
		if (f_si_vec_contains(si_per_tc, SYSTEM_INFORMATION_TYPE_22)) {
			setverdict(fail, "Cannot have SI16/SI17 and SI22!");
			mtc.stop;
		}
		if (not cfg.bcch_extended) {
			testcase.stop("Error: SI16/SI17 requires BCCH Extd!");
		}
		if (cfg.si16_present) {
			f_ensure_si_vec_contains(si_per_tc, 6, SYSTEM_INFORMATION_TYPE_16, true);
		}
		if (cfg.si17_present) {
			f_ensure_si_vec_contains(si_per_tc, 2, SYSTEM_INFORMATION_TYPE_17, true);
		}
	}

		/* ix) System Information type 18 and 20 are sent in order to transmit non-GSM
		 * broadcast information. The frequency with which they are sent is determined by the
		 * system operator. System Information type 9 identifies the scheduling of System
		 * Information type 18 and 20 messages. */

		/* x) System Information Type 19 is sent if COMPACT neighbours exist. If System
		 * Information Type 19 is present, then its scheduling shall be indicated in System
		 * Information Type 9. */

	if (cfg.si15_present) {
		/* xi) System Information Type 15 is broadcast if dynamic ARFCN mapping is used in the
		 * PLMN. If sent on BCCH Norm, it is sent at least once within any of 4 consecutive
		 * occurrences of TC = 4. If sent on BCCH Ext, it is sent at least once within any of
		 * 4 consecutive occurrences of TC = 1. */
		if (not cfg.bcch_extended) {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_15, false, 1, 4);
		} else {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 1, SYSTEM_INFORMATION_TYPE_15, true, 1, 4);
		}
	}
	if (cfg.si13alt_present) {
		/* xii) System Information type 13 alt is only related to the GERAN Iu mode. System
		 * Information Type 13 alt need only be sent if GERAN Iu mode support is indicated in
		 * one or more of System Information Type 3 or 4 or 7 or 8 messages and SI 13 is not
		 * broadcast. These messages also indicate if the message is sent on the BCCH Norm or
		 * if the message is transmitted on the BCCH Ext. In the case that the message is sent
		 * on the BCCH Norm, it is sent at least once within any of 4 consecutive occurrences
		 * of TC = 4. */
		if (cfg.si13_present) {
			testcase.stop("Error: Cannot have SI13alt and SI13");
		}
		if (f_si_vec_contains(si_per_tc, SYSTEM_INFORMATION_TYPE_13)) {
			setverdict(fail, "Cannot have SI13alt and SI13");
			mtc.stop;
		}
		if (not cfg.bcch_extended) {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_13alt, false, 1, 4);
		} else {
			f_ensure_si_vec_contains(si_per_tc, 0, SYSTEM_INFORMATION_TYPE_13alt, true);
		}
	}
	if (cfg.si2n_present) {
		/* xiii) System Information Type 2n is optionally sent on BCCH Norm or BCCH Ext if needed,
		 * as determined by the system operator. In the case that the message is sent on the
		 * BCCH Norm, it is sent at least once within any of 4 consecutive occurrences of TC =
		 * 4. If the message is sent on BCCH Ext, it is sent at least once within any of 2
		 * consecutive occurrences of TC = 4. */
		if (not cfg.bcch_extended) {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_2n, false, 1, 4);
		} else {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_2n, true, 2, 4);
		}
	}
	if (cfg.si21_present) {
		/* xiv) System Information Type 21 is optionally sent on BCCH Norm or BCCH Ext, as
		 * determined by the system operator. If Extended Access Barring is in use in the cell
		 * then this message is sent at least once within any of 4 consecutive occurrences of
		 * TC = 4 regardless if it is sent on BCCH Norm or BCCH Ext. If BCCH Ext is used in a
		 * cell then this message shall only be sent on BCCH Ext. */
		if (not cfg.bcch_extended) {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_21, false, 1, 4);
		} else {
			f_ensure_si_vec_contains_n_of_m(si_per_tc, 4, SYSTEM_INFORMATION_TYPE_21, true, 1, 4);
			if (f_si_vecslot_contains(si_per_tc[4], SYSTEM_INFORMATION_TYPE_21)) {
				setverdict(fail, "Cannot have SI21 on BCCH Norm if BCCH Extd enabled!");
				mtc.stop;
			}
		}
	}
	if (cfg.si22_present) {
		/* xv) System Information Type 22 is sent if network sharing is in use in the cell. It
		 * should not be sent in a cell where SoLSA is used (see rule viii). System
		 * Information Type 22 instances shall be sent on BCCH Ext within any occurrence of TC
		 * =2 and TC=6. */
		if (cfg.si16_present or cfg.si17_present) {
			testcase.stop("Error: Cannot have SI16/SI17 and SI22!");
		}
		if (f_si_vec_contains(si_per_tc, SYSTEM_INFORMATION_TYPE_16) or
		    f_si_vec_contains(si_per_tc, SYSTEM_INFORMATION_TYPE_17)) {
			setverdict(fail, "Cannot have SI16/SI17 and SI22!");
			mtc.stop;
		}
		if (not cfg.bcch_extended) {
			testcase.stop("Error: SI22 requires BCCH Extd!");
		} else {
			f_ensure_si_vec_contains_only(si_per_tc, 2, SYSTEM_INFORMATION_TYPE_22, true);
			f_ensure_si_vec_contains_only(si_per_tc, 6, SYSTEM_INFORMATION_TYPE_22, true);
		}
	}
}

/* sample Systme Information for specified duration via L1CTL */
function f_l1_sample_si(L1CTL_PT pt, float duration := 8.0) return SystemInformationVectorPerTc {
	timer T := duration;
	var SystemInformationVectorPerTc si_per_tc;
	var L1ctlDlMessage l1_dl;

	/* initialize all per-TC vectors empty */
	for (var integer i:= 0; i < sizeof(si_per_tc); i := i+1) {
		si_per_tc[i] := {};
	}

	/* flush all previous L1 queued msgs */
	pt.clear;

	T.start;
	alt {
	[] pt.receive(tr_L1CTL_DATA_IND(t_RslChanNr_BCCH(0), ?)) -> value l1_dl {
		/* somehow dec_SystemInformation will try to decode even non-RR as SI */
		if (not (l1_dl.payload.data_ind.payload[1] ==  '06'O)) {
			log("Ignoring non-RR SI ", l1_dl);
			repeat;
		}
		var SystemInformationFn sig := {
			frame_number := l1_dl.dl_info.frame_nr,
			si := dec_SystemInformation(l1_dl.payload.data_ind.payload)
		}
		var integer tc := f_gsm_compute_tc(sig.frame_number);
		log("SI received at TC=", tc, ": ", sig.si);
		/* append to the per-TC bucket */
		si_per_tc[tc] := si_per_tc[tc] & { sig };
		repeat;
		}
	[] pt.receive { repeat; }
	[] T.timeout { }
	}

	for (var integer i:= 0; i < sizeof(si_per_tc); i := i+1) {
		log(testcasename(), ": TC=", i, " has #of SI=", sizeof(si_per_tc[i]));
	}
	log("si_per_tc=", si_per_tc);
	return si_per_tc;
}

/* helper function: Set given SI via RSL + validate scheduling.
 * CALLER MUST MAKE SURE TO CHANGE GLOBAL si_cfg! */
function f_TC_si_sched() runs on test_CT {
	var SystemInformationVectorPerTc si_per_tc;
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	/* Sample + Validate Scheduling */
	si_per_tc := f_l1_sample_si(L1CTL);
	f_validate_si_scheduling(si_cfg, si_per_tc);

	setverdict(pass);
}

testcase TC_si_sched_default() runs on test_CT {
	f_init();
	/* 2+3+4 are mandatory and set in f_init() */
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_1() runs on test_CT {
	f_init();
	si_cfg.si1_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_1, '5506198fb38000000000000000000000000000e504002b'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_2bis() runs on test_CT {
	f_init();
	si_cfg.si2bis_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2bis, '550602bfe809b3ff00000000000000000000007900002b'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_2ter() runs on test_CT {
	f_init();
	si_cfg.si2ter_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2ter, '010603bf66b0aa0a00000002000000000000002b2b2b2b'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_2ter_2bis() runs on test_CT {
	f_init();
	si_cfg.si2bis_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2bis, '550602bfe809b3ff00000000000000000000007900002b'O);
	si_cfg.si2ter_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2ter, '010603bf66b0aa0a00000002000000000000002b2b2b2b'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_2quater() runs on test_CT {
	f_init();
	si_cfg.si2quater_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2quater, '050607a8a0364aa698d72ff424feee0506d5e7fff02043'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_13() runs on test_CT {
	f_init();
	si_cfg.si13_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_13, '0106009000185a6fc9e08410ab2b2b2b2b2b2b2b2b2b2b'O);
	f_TC_si_sched();
	f_shutdown();
}

testcase TC_si_sched_13_2bis_2ter_2quater() runs on test_CT {
	f_init();
	si_cfg.si2bis_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2bis, '550602bfe809b3ff00000000000000000000007900002b'O);
	si_cfg.si2ter_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2ter, '010603bf66b0aa0a00000002000000000000002b2b2b2b'O);
	si_cfg.si2quater_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_2quater, '050607a8a0364aa698d72ff424feee0506d5e7fff02043'O);
	si_cfg.si13_present := true;
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_13, '0106009000185a6fc9e08410ab2b2b2b2b2b2b2b2b2b2b'O);
	f_TC_si_sched();
	f_shutdown();
}


testcase TC_bcch_info() runs on test_CT {
	f_init(testcasename());
	/* FIXME: enable / disable individual BCCH info */
	//ts_RSL_BCCH_INFO(si_type, info);
	/* expect no ERROR REPORT after either of them *
	/* negative test: ensure ERROR REPORT on unsupported types */
	f_shutdown();
}

/***********************************************************************
 * Low-Level Protocol Errors / ERROR REPORT
 ***********************************************************************/

private function f_exp_err_rep(template RSL_Cause cause) runs on test_CT {
	timer T := 5.0;
	T.start;
	alt {
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_ERROR_REPORT(cause))) {
		setverdict(pass);
		}
	[] RSL_CCHAN.receive(tr_RSL_UD(tr_RSL_ERROR_REPORT(?))) {
		setverdict(fail, "Wrong cause in RSL ERR REP");
		mtc.stop;
		}
	[] RSL_CCHAN.receive {
		repeat;
		}
	[] T.timeout {
		setverdict(fail, "Timeout waiting for RSL ERR REP");
		mtc.stop;
		}
	}
}

/* Provoke a protocol error (message too short) and match on ERROR REPORT */
testcase TC_rsl_protocol_error() runs on test_CT {
	f_init(testcasename());
	var RSL_Message rsl := valueof(ts_RSL_BCCH_INFO(RSL_SYSTEM_INFO_1, ''O));
	rsl.ies := omit;
	RSL_CCHAN.send(ts_RSL_UD(rsl));

	f_exp_err_rep(RSL_ERR_PROTO);
}

/* Provoke a mandatory IE error and match on ERROR REPORT */
testcase TC_rsl_mand_ie_error() runs on test_CT {
	f_init(testcasename());

	var RSL_Message rsl := valueof(ts_RSL_BCCH_INFO(RSL_SYSTEM_INFO_1, ''O));
	rsl.ies := { rsl.ies[0] };
	RSL_CCHAN.send(ts_RSL_UD(rsl));

	f_exp_err_rep(RSL_ERR_MAND_IE_ERROR);
}

/* Provoke an IE content error and match on ERROR REPORT */
testcase TC_rsl_ie_content_error() runs on test_CT {
	f_init(testcasename());
	var RSL_Message rsl := valueof(ts_RSL_BCCH_INFO(RSL_SYSTEM_INFO_1, ''O));
	rsl.ies[1].body.sysinfo_type := RSL_SYSTEM_INFO_5;
	RSL_CCHAN.send(ts_RSL_UD(rsl));

	f_exp_err_rep(RSL_ERR_IE_CONTENT);
}

/***********************************************************************
 * IPA CRCX/MDCX/DLCS media stream handling
 ***********************************************************************/

/* Send IPA DLCX to inactive lchan */
function f_TC_ipa_dlcx_not_active(charstring id) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_IPA_DLCX(g_chan_nr, 0), tr_RSL_IPA_DLCX_ACK(g_chan_nr, ?, ?),
			 "IPA DLCX ACK");
}
testcase TC_ipa_dlcx_not_active() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init(testcasename());
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_ipa_dlcx_not_active), pars);
	vc_conn.done;
}

/* Send IPA CRCX twice to inactive lchan */
function f_TC_ipa_crcx_twice_not_active(charstring id) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?),
			 "IPA CRCX ACK");
	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_NACK(g_chan_nr, RSL_ERR_RES_UNAVAIL),
			 "IPA CRCX NACK");
}
testcase TC_ipa_crcx_twice_not_active() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init(testcasename());
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_ipa_crcx_twice_not_active), pars);
	vc_conn.done;
}

/* Regular sequence of CRCX/MDCX/DLCX */
function f_TC_ipa_crcx_mdcx_dlcx_not_active(charstring id) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?),
			 "IPA CRCX ACK");
	var uint32_t remote_ip := f_rnd_int(c_UINT32_MAX);
	var uint16_t remote_port := f_rnd_int(c_UINT16_MAX);
	var uint7_t rtp_pt2 := f_rnd_int(127);
	var uint16_t fake_conn_id := 23; /* we're too lazy to read it out from the CRCX ACK above */
	f_rsl_transceive(ts_RSL_IPA_MDCX(g_chan_nr, fake_conn_id, remote_ip, remote_port, rtp_pt2),
			 tr_RSL_IPA_MDCX_ACK(g_chan_nr, ?, ?, ?, rtp_pt2),
			 "IPA MDCX ACK");
	f_rsl_transceive(ts_RSL_IPA_DLCX(g_chan_nr, fake_conn_id), tr_RSL_IPA_DLCX_ACK(g_chan_nr, ?, ?),
			 "IPA DLCX ACK");
}
testcase TC_ipa_crcx_mdcx_dlcx_not_active() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init(testcasename());
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_ipa_crcx_mdcx_dlcx_not_active), pars);
	vc_conn.done;
}

/* Sequence of CRCX, 2x MDCX, DLCX */
function f_TC_ipa_crcx_mdcx_mdcx_dlcx_not_active(charstring id) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?),
			 "IPA CRCX ACK");
	var uint32_t remote_ip := f_rnd_int(c_UINT32_MAX);
	var uint16_t remote_port := f_rnd_int(c_UINT16_MAX);
	var uint7_t rtp_pt2 := f_rnd_int(127);
	var uint16_t fake_conn_id := 23; /* we're too lazy to read it out from the CRCX ACK above */
	f_rsl_transceive(ts_RSL_IPA_MDCX(g_chan_nr, fake_conn_id, remote_ip, remote_port, rtp_pt2),
			 tr_RSL_IPA_MDCX_ACK(g_chan_nr, ?, ?, ?, rtp_pt2),
			 "IPA MDCX ACK");
	/* Second MDCX */
	remote_ip := f_rnd_int(c_UINT32_MAX);
	remote_port := f_rnd_int(c_UINT16_MAX);
	f_rsl_transceive(ts_RSL_IPA_MDCX(g_chan_nr, fake_conn_id, remote_ip, remote_port, rtp_pt2),
			 tr_RSL_IPA_MDCX_ACK(g_chan_nr, ?, ?, ?, rtp_pt2),
			 "IPA MDCX ACK");
	f_rsl_transceive(ts_RSL_IPA_DLCX(g_chan_nr, fake_conn_id), tr_RSL_IPA_DLCX_ACK(g_chan_nr, ?, ?),
			 "IPA DLCX ACK");
}
testcase TC_ipa_crcx_mdcx_mdcx_dlcx_not_active() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	f_init(testcasename());
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_ipa_crcx_mdcx_mdcx_dlcx_not_active), pars);
	vc_conn.done;
}

/* IPA CRCX on SDCCH/4 and SDCCH/8 (doesn't make sense) */
function f_TC_ipa_crcx_sdcch_not_active(charstring id) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_IPA_CRCX(g_chan_nr), tr_RSL_IPA_CRCX_NACK(g_chan_nr, ?),
			 "IPA CRCX NACK");
}
testcase TC_ipa_crcx_sdcch_not_active() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_SDCCH4(0,1), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_ipa_crcx_sdcch_not_active), pars);
	vc_conn.done;

	pars := valueof(t_Pars(t_RslChanNr_SDCCH8(6,5), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_ipa_crcx_sdcch_not_active), pars);
	vc_conn.done;
}


/***********************************************************************
 * PCU Socket related tests
 ***********************************************************************/

private function f_TC_pcu_act_req(uint8_t bts_nr, uint8_t trx_nr, uint8_t ts_nr, boolean exp_success)
runs on test_CT {
	timer T := 3.0;

	/* we don't expect any RTS.req before PDCH are active */
	T.start;
	alt {
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RTS_REQ(bts_nr))) {
		setverdict(fail, "PCU RTS.req before PDCH active?");
		mtc.stop;
		}
	[] PCU.receive { repeat; }
	[] T.timeout { }
	}

	/* Send PDCH activate request for known PDCH timeslot */
	PCU.send(t_SD_PCUIF(g_pcu_conn_id, ts_PCUIF_ACT_REQ(bts_nr, trx_nr, ts_nr)));

	/* we now expect RTS.req for this timeslot (only) */
	T.start;
	alt {
	[exp_success] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RTS_REQ(bts_nr, trx_nr, ts_nr))) {
		setverdict(pass);
		}
	[not exp_success] PCU.receive(t_SD_PCUIF(g_pcu_conn_id,
						 tr_PCUIF_RTS_REQ(bts_nr, trx_nr, ts_nr))) {
		setverdict(fail, "Unexpected RTS.req for supposedly failing activation");
		mtc.stop;
		}
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RTS_REQ)) {
		setverdict(fail, "RTS.req for wrong TRX/TS");
		mtc.stop;
		}
	[] PCU.receive { repeat; }
	[exp_success] T.timeout {
		setverdict(fail, "Timeout waiting for PCU RTS.req");
		mtc.stop;
		}
	[not exp_success] T.timeout {
		setverdict(pass);
		}
	}
}

private function f_TC_pcu_deact_req(uint8_t bts_nr, uint8_t trx_nr, uint8_t ts_nr)
runs on test_CT {
	timer T := 3.0;

	/* Send PDCH activate request for known PDCH timeslot */
	PCU.send(t_SD_PCUIF(g_pcu_conn_id, ts_PCUIF_DEACT_REQ(bts_nr, trx_nr, ts_nr)));

	PCU.clear;
	/* we now expect no RTS.req for this timeslot */
	T.start;
	alt {
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RTS_REQ(bts_nr, trx_nr, ts_nr))) {
		setverdict(fail, "Received unexpected PCU RTS.req");
		mtc.stop;
		}
	[] PCU.receive { repeat; }
	[] T.timeout {
		setverdict(pass);
		}
	}
}

/* PDCH activation via PCU socket; check for presence of RTS.req */
testcase TC_pcu_act_req() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
}

/* PDCH activation via PCU socket on non-PDCU timeslot */
testcase TC_pcu_act_req_wrong_ts() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 1, false);
}

/* PDCH activation via PCU socket on wrong BTS */
testcase TC_pcu_act_req_wrong_bts() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(23, 0, 7, false);
}

/* PDCH activation via PCU socket on wrong TRX */
testcase TC_pcu_act_req_wrong_trx() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 23, 7, false);
}

/* PDCH deactivation via PCU socket; check for absence of RTS.req */
testcase TC_pcu_deact_req() runs on test_CT {
	f_init();
	/* Activate PDCH */
	f_TC_pcu_act_req(0, 0, 7, true);
	f_sleep(1.0);
	/* and De-Activate again */
	f_TC_pcu_deact_req(0, 0, 7);
}

/* Attempt to deactivate a PDCH on a non-PDCH timeslot */
testcase TC_pcu_deact_req_wrong_ts() runs on test_CT {
	f_init();
	f_TC_pcu_deact_req(0, 0, 1);
}

/* Test the PCU->BTS Version and BTS->PCU SI13 handshake */
testcase TC_pcu_ver_si13() runs on test_CT {
	const octetstring si13 := '00010203040506070909'O;
	var PCUIF_send_data sd;
	timer T:= 3.0;
	f_init();

	/* Set SI13 via RSL */
	f_rsl_bcch_fill_raw(RSL_SYSTEM_INFO_13, si13);
	PCU.send(t_SD_PCUIF(g_pcu_conn_id, ts_PCUIF_TXT_IND(0, PCU_VERSION, "BTS_Test v23")));
	T.start;
	alt {
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_DATA_IND(0, 0, 0, ?, PCU_IF_SAPI_BCCH))) -> value sd {
		if (substr(sd.data.u.data_ind.data, 0, lengthof(si13)) == si13) {
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] PCU.receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for SI13");
		mtc.stop;
		}
	}
}

private const octetstring c_PCU_DATA := '000102030405060708090a0b0c0d0e0f10111213141516'O;

/* helper function to send a PCU DATA.req */
private function f_pcu_data_req(uint8_t bts_nr, uint8_t trx_nr, uint8_t ts_nr,
				uint8_t block_nr, uint32_t fn, PCUIF_Sapi sapi, octetstring data)
runs on test_CT
{
	PCU.send(t_SD_PCUIF(g_pcu_conn_id,
			ts_PCUIF_DATA_REQ(bts_nr, trx_nr, ts_nr, block_nr, fn, sapi, data)));
}

/* helper function to wait for RTS.ind for given SAPI on given BTS/TRX/TS and then send */
private function f_pcu_wait_rts_and_data_req(uint8_t bts_nr, uint8_t trx_nr, uint8_t ts_nr,
					     PCUIF_Sapi sapi, octetstring data)
runs on test_CT
{
	var PCUIF_send_data sd;

	timer T := 3.0;
	T.start;
	alt {
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id,
				tr_PCUIF_RTS_REQ(bts_nr, trx_nr, ts_nr, sapi))) -> value sd {
		f_pcu_data_req(bts_nr, trx_nr, ts_nr, sd.data.u.rts_req.block_nr,
				  sd.data.u.rts_req.fn, sapi, data);
		}
	[] PCU.receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for RTS.ind");
		mtc.stop;
		}
	}
}

/* Send DATA.req on invalid BTS */
testcase TC_pcu_data_req_wrong_bts() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_data_req(23, 0, 7, 0, 0, PCU_IF_SAPI_PDTCH, c_PCU_DATA);
	/* FIXME: how to check this wasn't actually sent and didn't crash BTS? */
	f_sleep(10.0);
}

/* Send DATA.req on invalid TRX */
testcase TC_pcu_data_req_wrong_trx() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_data_req(0, 100, 7, 0, 0, PCU_IF_SAPI_PDTCH, c_PCU_DATA);
	/* FIXME: how to check this wasn't actually sent and didn't crash BTS? */
	f_sleep(10.0);
}

/* Send DATA.req on invalid timeslot */
testcase TC_pcu_data_req_wrong_ts() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_data_req(0, 0, 70, 0, 0, PCU_IF_SAPI_PDTCH, c_PCU_DATA);
	/* FIXME: how to check this wasn't actually sent and didn't crash BTS? */
	f_sleep(10.0);
}

/* Send DATA.req on timeslot that hasn't been activated */
testcase TC_pcu_data_req_ts_inactive() runs on test_CT {
	f_init();
	f_pcu_data_req(0, 0, 7, 0, 0, PCU_IF_SAPI_PDTCH, c_PCU_DATA);
	/* FIXME: how to check this wasn't actually sent and didn't crash BTS? */
	f_sleep(2.0);
}

testcase TC_pcu_data_req_pdtch() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_wait_rts_and_data_req(0, 0, 7, PCU_IF_SAPI_PDTCH, c_PCU_DATA);
	/* FIXME: how to check this was actually sent */
	f_sleep(2.0);
}

testcase TC_pcu_data_req_ptcch() runs on test_CT {
	f_init();
	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_wait_rts_and_data_req(0, 0, 7, PCU_IF_SAPI_PTCCH, c_PCU_DATA);
	/* FIXME: how to check this was actually sent */
	f_sleep(2.0);
}

/* Send AGCH from PCU; check it appears on Um side */
testcase TC_pcu_data_req_agch() runs on test_CT {
	timer T := 3.0;
	f_init();
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	f_TC_pcu_act_req(0, 0, 7, true);
	f_pcu_data_req(0, 0, 7, 0, 0, PCU_IF_SAPI_AGCH, c_PCU_DATA);

	T.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0), ?, c_PCU_DATA)) {
		setverdict(pass);
		}
	[] L1CTL.receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for PCU-originated AGCH block on Um");
		mtc.stop;
		}
	}
}

/* Send IMM.ASS from PCU for PCH; check it appears on Um side */
testcase TC_pcu_data_req_imm_ass_pch() runs on test_CT {
	var octetstring imm_ass := f_rnd_octstring(23);
	f_init();
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	/* append 3 last imsi digits so BTS can compute pagng group */
	var uint32_t fn := f_PCUIF_tx_imm_ass_pch(PCU, g_pcu_conn_id, imm_ass, '123459987'H);

	timer T := 0.5;
	T.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0), ?, imm_ass)) {
		/* TODO: verify paging group */
		setverdict(pass);
		}
	[] L1CTL.receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for PCU-originated AGCH block on Um");
		mtc.stop;
		}
	}
}

/* Send RACH from Um side, expect it to show up on PCU socket */
testcase TC_pcu_rach_content() runs on test_CT {
	f_init();
	f_init_l1ctl();
	f_l1_tune(L1CTL);

	var GsmFrameNumber fn_last := 0;
	for (var integer i := 0; i < 1000; i := i+1) {
		var OCT1 ra := f_rnd_ra_ps();
		var GsmFrameNumber fn := f_L1CTL_RACH(L1CTL, oct2int(ra));
		if (fn == fn_last) {
			setverdict(fail, "Two RACH in same FN?!?");
			mtc.stop;
		}
		fn_last := fn;

		timer T := 2.0;
		T.start;
		alt {
		[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RACH_IND(0, oct2int(ra), 0, ?, fn))) {
			T.stop;
			}
		[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RACH_IND)) {
			setverdict(fail, "Unexpected RACH IND");
			mtc.stop;
			}
		[] PCU.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for RACH IND");
			mtc.stop;
			}
		}
	}
	setverdict(pass);
}

private function f_pad_oct(octetstring str, integer len, OCT1 pad) return octetstring {
	var integer strlen := lengthof(str);
	for (var integer i := 0; i < len-strlen; i := i+1) {
		str := str & pad;
	}
	return str;
}

/* Send PAGING via RSL, expect it to shw up on PCU socket */
testcase TC_pcu_paging_from_rsl() runs on test_CT {
	f_init();

	for (var integer i := 0; i < 100; i := i+1) {
		var MobileL3_CommonIE_Types.MobileIdentityLV mi;
		timer T := 3.0;
		if (i < 50) {
			mi := valueof(ts_MI_TMSI_LV(f_rnd_octstring(4)));
		} else {
			mi := valueof(ts_MI_IMSI_LV(f_gen_imsi(i)));
		}
		var octetstring mi_enc_lv := enc_MobileIdentityLV(mi);
		var octetstring mi_enc := substr(mi_enc_lv, 1, lengthof(mi_enc_lv)-1);
		var octetstring t_mi_lv := f_pad_oct(mi_enc_lv, 9, '00'O);

		/* Send RSL PAGING COMMAND */
		RSL_CCHAN.send(ts_RSL_UD(ts_RSL_PAGING_CMD(mi_enc, i mod 4)));
		T.start;
		alt {
		[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_PAG_REQ(0, t_mi_lv))) {
			}
		[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_PAG_REQ)) {
			setverdict(fail, "Unexpected PAGING REQ");
			mtc.stop;
			}
		[] PCU.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for PAGING REQ");
			mtc.stop;
			}
		}
	}
	setverdict(pass);
}

/***********************************************************************
 * Osmocom Style Dynamic Timeslot Support
 ***********************************************************************/

private function f_dyn_osmo_pdch_act(integer pcu_conn_id, integer bts_nr, integer trx_nr)
runs on ConnHdlr {
	var PCUIF_send_data sd;
	/* Expect BTS to immediately acknowledge activation as PDCH */
	PCU.clear;
	f_rsl_chan_act(g_pars.chan_mode);
	/* expect INFO_IND on PCU interface listing TS as PDCH */
	alt {
	[] PCU.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(bts_nr, ?))) -> value sd {
		if (substr(sd.data.u.info_ind.trx[trx_nr].pdch_mask, g_chan_nr.tn, 1) != '1'B) {
			setverdict(fail, "PCUIF_INFO_IND PDCH_MASK not '1' after PDCH ACT");
			mtc.stop;
		}
		}
	[] PCU.receive { repeat; }
	}
	/* try to activate this PDCH from the PCU point of view */
	PCU.send(t_SD_PCUIF(pcu_conn_id, ts_PCUIF_ACT_REQ(bts_nr, trx_nr, g_chan_nr.tn)));
	/* FIXME: is there a response? */
}

private function f_dyn_osmo_pdch_deact(integer pcu_conn_id, integer bts_nr, integer trx_nr)
runs on ConnHdlr {
	var PCUIF_send_data sd;
	/* Send RSL CHAN REL (deactivate) */
	PCU.clear;
	RSL.send(ts_RSL_RF_CHAN_REL(g_chan_nr));
	/* expect BTS to ask PCU to deactivate the channel */
	alt {
	[] PCU.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(bts_nr, ?))) -> value sd {
		if (substr(sd.data.u.info_ind.trx[trx_nr].pdch_mask, g_chan_nr.tn, 1) != '0'B) {
			setverdict(fail, "PCUIF_INFO_IND PDCH_MASK not '0' after PDCH DEACT");
			mtc.stop;
		}
		}
	[] PCU.receive { repeat; }
	}
	/* Emulate PCU asking BTS to deactivate PDCH */
	PCU.send(t_SD_PCUIF(pcu_conn_id, ts_PCUIF_DEACT_REQ(bts_nr, trx_nr, g_chan_nr.tn)));
	alt {
	[] RSL.receive(tr_RSL_RF_CHAN_REL_ACK(g_chan_nr)) {
		setverdict(pass);
		}
	[] RSL.receive { repeat; }
	}
}

/* Activate Osmocom-style dynamic PDCH from BSC side */
function f_TC_dyn_osmo_pdch_act_deact(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_dyn_osmo_pdch_act(pcu_conn_id, bts_nr, trx_nr);
	f_sleep(3.0);
	f_dyn_osmo_pdch_deact(pcu_conn_id, bts_nr, trx_nr);
	setverdict(pass);
}
testcase TC_dyn_osmo_pdch_act_deact() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_PDCH(4), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_osmo_pdch_act_deact), pars, true);
	vc_conn.done;
}

/* send a RF CHAN REL for PDCH on an osmocom dynamci PDCH that's already inactive */
function f_TC_dyn_osmo_pdch_unsol_deact(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	RSL.send(ts_RSL_RF_CHAN_REL(g_chan_nr));
	/* since the lchan is already released, we don't expect any PCU changes, just a rel ack. */
	RSL.receive(tr_RSL_RF_CHAN_REL_ACK(g_chan_nr));
	setverdict(pass);
}
testcase TC_dyn_osmo_pdch_unsol_deact() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_PDCH(4), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_osmo_pdch_unsol_deact), pars, true);
	vc_conn.done;
}

/* try to RSL CHAN ACT a PDCH on an osmocom-style PDCH that's already active */
function f_TC_dyn_osmo_pdch_double_act(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_dyn_osmo_pdch_act(pcu_conn_id, bts_nr, trx_nr);
	/* Send a second Chan Activ and expect it to be NACKed */
	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_NACK(g_chan_nr),
			 "RSL CHAN ACT NACK");
	setverdict(pass);
}
testcase TC_dyn_osmo_pdch_double_act() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_PDCH(4), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_osmo_pdch_double_act), pars, true);
	vc_conn.done;
}

/* try to RSL CHAN ACT a TCH/F on an osmocom-style PDCH */
function f_TC_dyn_osmo_pdch_tchf_act(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;
	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(g_chan_nr.tn));

	/* register for the TCH/F channel number */
	f_rslem_register(0, chan_nr);

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_rsl_transceive(ts_RSL_CHAN_ACT(chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_ACK(chan_nr),
			 "RSL CHAN ACT");
	setverdict(pass);
}
testcase TC_dyn_osmo_pdch_tchf_act() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_PDCH(4), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_osmo_pdch_tchf_act), pars, true);
	vc_conn.done;
}

/* try to RSL CHAN ACT the TCH/H on an osmocom-style PDCH */
function f_TC_dyn_osmo_pdch_tchh_act(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;
	var RslChannelNr chan_nr[2] := { valueof(t_RslChanNr_Lm(g_chan_nr.tn, 0)),
					 valueof(t_RslChanNr_Lm(g_chan_nr.tn, 1)) };

	/* register for the TCH/H channel numbers */
	f_rslem_register(0, chan_nr[0]);
	f_rslem_register(0, chan_nr[1]);

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_rsl_transceive(ts_RSL_CHAN_ACT(chan_nr[1], g_pars.chan_mode),
			 tr_RSL_CHAN_ACT_ACK(chan_nr[1]), "RSL CHAN ACT [1]");
	f_rsl_transceive(ts_RSL_CHAN_ACT(chan_nr[0], g_pars.chan_mode),
			 tr_RSL_CHAN_ACT_ACK(chan_nr[0]), "RSL CHAN ACT [0]");
	setverdict(pass);
}
testcase TC_dyn_osmo_pdch_tchh_act() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_PDCH(4), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_osmo_pdch_tchh_act), pars, true);
	vc_conn.done;
}

/***********************************************************************
 * IPA Style Dynamic Timeslot Support
 ***********************************************************************/

private function f_dyn_ipa_pdch_act(integer pcu_conn_id, integer bts_nr, integer trx_nr)
runs on ConnHdlr {
	var PCUIF_send_data sd;
	/* Expect BTS to immediately acknowledge activation as PDCH */
	PCU.clear;
	RSL.send(ts_RSL_IPA_PDCH_ACT(g_chan_nr));
	/* expect INFO_IND on PCU interface listing TS as PDCH */
	alt {
	[] PCU.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(bts_nr, ?))) -> value sd {
		if (substr(sd.data.u.info_ind.trx[trx_nr].pdch_mask, g_chan_nr.tn, 1) != '1'B) {
			setverdict(fail, "PCUIF_INFO_IND PDCH_MASK not '1' after PDCH ACT");
			mtc.stop;
		}
		}
	[] PCU.receive { repeat; }
	}
	/* try to activate this PDCH from the PCU point of view */
	PCU.send(t_SD_PCUIF(pcu_conn_id, ts_PCUIF_ACT_REQ(bts_nr, trx_nr, g_chan_nr.tn)));
	/* FIXME: is there a response? */

	RSL.receive(tr_RSL_IPA_PDCH_ACT_ACK(g_chan_nr, ?));
}

private function f_dyn_ipa_pdch_deact(integer pcu_conn_id, integer bts_nr, integer trx_nr)
runs on ConnHdlr {
	var PCUIF_send_data sd;
	/* Send RSL CHAN REL (deactivate) */
	RSL.send(ts_RSL_IPA_PDCH_DEACT(g_chan_nr));
	PCU.clear;
	/* expect BTS to ask PCU to deactivate the channel */
	alt {
	[] PCU.receive(t_SD_PCUIF(pcu_conn_id, tr_PCUIF_INFO_IND(bts_nr, ?))) -> value sd {
		if (substr(sd.data.u.info_ind.trx[trx_nr].pdch_mask, g_chan_nr.tn, 1) != '0'B) {
			setverdict(fail, "PCUIF_INFO_IND PDCH_MASK not '0' after PDCH DEACT");
			mtc.stop;
		}
		}
	[] PCU.receive { repeat; }
	}
	/* Emulate PCU asking BTS to deactivate PDCH */
	PCU.send(t_SD_PCUIF(pcu_conn_id, ts_PCUIF_DEACT_REQ(bts_nr, trx_nr, g_chan_nr.tn)));
	alt {
	[] RSL.receive(tr_RSL_IPA_PDCH_DEACT_ACK(g_chan_nr)) {
		setverdict(pass);
		}
	[] RSL.receive { repeat; }
	}
}

/* Activate and de-activate an IPA-style dynamic TCH/F + PDCH */
function f_TC_dyn_ipa_pdch_act_deact(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_dyn_ipa_pdch_act(pcu_conn_id, bts_nr, trx_nr);
	f_sleep(3.0);
	f_dyn_ipa_pdch_deact(pcu_conn_id, bts_nr, trx_nr);

	setverdict(pass);

}
testcase TC_dyn_ipa_pdch_act_deact() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init();

	pars := valueof(t_Pars(t_RslChanNr_Bm(3), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_ipa_pdch_act_deact), pars, true);
	vc_conn.done;
}

/* try to RSL CHAN ACT a TCH/F on an IPA-style PDCH */
function f_TC_dyn_ipa_pdch_tchf_act(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_ACK(g_chan_nr),
			 "RSL CHAN ACT");
	f_rsl_transceive(ts_RSL_RF_CHAN_REL(g_chan_nr), tr_RSL_RF_CHAN_REL_ACK(g_chan_nr),
			"RF CHAN REL", true);
	setverdict(pass);
}
testcase TC_dyn_ipa_pdch_tchf_act() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_Bm(3), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_ipa_pdch_tchf_act), pars, true);
	vc_conn.done;
}

/* Activate IPA style dyn PDCH as TCH/F and then illegally try to activate it as PDCH, too */
function f_TC_dyn_ipa_pdch_tchf_act_pdch_act_nack(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_ACK(g_chan_nr),
			 "RSL CHAN ACT");

	RSL.send(ts_RSL_IPA_PDCH_ACT(g_chan_nr));
	alt {
	[] RSL.receive(tr_RSL_IPA_PDCH_ACT_NACK(g_chan_nr, ?));
	[] RSL.receive(tr_RSL_IPA_PDCH_ACT_ACK(g_chan_nr, ?)) {
		setverdict(fail, "Unexpected PDCH ACT ACK");
		mtc.stop;
		}
	[] RSL.receive { repeat; }
	}

	f_rsl_transceive(ts_RSL_RF_CHAN_REL(g_chan_nr), tr_RSL_RF_CHAN_REL_ACK(g_chan_nr),
			"RF CHAN REL", true);
	setverdict(pass);
}
testcase TC_dyn_ipa_pdch_tchf_act_pdch_act_nack() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_Bm(3), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_ipa_pdch_tchf_act_pdch_act_nack), pars, true);
	vc_conn.done;
}

/* try to RSL CHAN ACT a TCH/F on an IPA-style PDCH that's already in PDCH mode; expect NACK */
function f_TC_dyn_ipa_pdch_act_tchf_act_nack(charstring id) runs on ConnHdlr {
	var PCUIF_Message first_info;
	var integer ts_nr := g_chan_nr.tn;
	var integer trx_nr := 0;
	var integer bts_nr := 0;
	var integer pcu_conn_id := -1;

	/* register for the TCH/F channel number */
	f_rslem_register(0, g_chan_nr);

	f_init_pcu(PCU, id, pcu_conn_id, first_info);

	f_dyn_ipa_pdch_act(pcu_conn_id, bts_nr, trx_nr);

	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, g_pars.chan_mode), tr_RSL_CHAN_ACT_NACK(g_chan_nr),
			 "RSL CHAN ACT");

	f_dyn_ipa_pdch_deact(pcu_conn_id, bts_nr, trx_nr);

	setverdict(pass);
}
testcase TC_dyn_ipa_pdch_act_tchf_act_nack() runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	pars := valueof(t_Pars(t_RslChanNr_Bm(3), ts_RSL_ChanMode_SIGN));
	vc_conn := f_start_handler(refers(f_TC_dyn_ipa_pdch_act_tchf_act_nack), pars, true);
	vc_conn.done;
}


/***********************************************************************
 * LAPDm / RLL related
 ***********************************************************************/

private function f_tx_lapdm(template (value) LapdmFrame l,
			    template (value) RslLinkId link_id) runs on ConnHdlr {
	var octetstring l2 := enc_LapdmFrame(valueof(l));
	if (valueof(link_id.c) == SACCH) {
		/* prepend dummy L1 header */
		l2 := '0000'O & l2;
	}

	/* If required, pad L2 frame with constant 0x2b filling */
	l2 := f_pad_oct(l2, 23, '2B'O);

	log("encoding ", l, " to ", l2);
	L1CTL.send(ts_L1CTL_DATA_REQ(g_chan_nr, link_id, l2));
}

type record RllTestCase {
	uint3_t		sapi,
	RslLinkId	link_id,
	octetstring	l3,
	boolean		exp
}
type record of RllTestCase RllTestCases;
template RllTestCase t_EITC(uint3_t sapi, RslLinkId id, octetstring l3, boolean exp) := {
	sapi := sapi,
	link_id := id,
	l3 := l3,
	exp := exp
}

/* execute the same callback function with a set of different parameters (tcs) on a
 * variety of logical channels */
private function f_rll_testmatrix(RllTestCases tcs, void_fn fn) runs on test_CT {
	var ConnHdlrPars pars;
	var ConnHdlr vc_conn;
	f_init(testcasename());

	/* test on each of the channels we have */
	for (var integer i := 0; i < sizeof(g_AllChanTypes); i := i+1) {
		pars := valueof(t_Pars(g_AllChanTypes[i], ts_RSL_ChanMode_SIGN));

		/* test each of the test cases on the current channel */
		for (var integer j := 0; j < sizeof(tcs); j := j+1) {
			pars.spec.rll := tcs[j];
			log(testcasename(), ": XXX Starting ", tcs[j] , " on ", g_AllChanTypes[i]);
			vc_conn := f_start_handler(fn, pars);
			vc_conn.done;
		}
	}

	f_shutdown();
}

/* test if SABM on Um triggers EST IND (TS 48.058 3.1) */
private function f_TC_rll_est_ind(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;
	timer T := 3.0;

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	f_tx_lapdm(ts_LAPDm_SABM(tc.sapi, cr_MO_CMD, true, tc.l3), tc.link_id);
	T.start;
	alt {
	[tc.l3 != ''O] RSL.receive(tr_RSL_EST_IND(g_chan_nr, tc.link_id, tc.l3)) {
		if (tc.exp) {
			setverdict(pass);
		} else {
			setverdict(fail, "Unexpected EST IND with L3 in ", tc);
			mtc.stop;
		}
		}
	[tc.l3 == ''O] RSL.receive(tr_RSL_EST_IND_NOL3(g_chan_nr, tc.link_id)) {
		if (tc.exp) {
			setverdict(pass);
		} else {
			setverdict(fail, "Unexpected EST IND without L3 in ", tc);
			mtc.stop;
		}
		}
	[tc.exp] T.timeout {
		setverdict(fail, "Timeout waiting for EST IND");
		mtc.stop;
		}
	[not tc.exp] T.timeout {
		setverdict(pass);
		}
	}

	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_est_ind() runs on test_CT {
	var RllTestCases tcs := {
		/* SAPI0 establishment (contention resolution) */
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), '01020304'O, true)),
		/* normal SAPI0 establishment */
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), ''O, true)),
		/* SAPI 3 doesn't support contention resolution */
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), '01020304'O, false)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), '01020304'O, false)),
		/* normal SAPI3 establishment on main DCCH */
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), ''O, true)),
		/* normal SAPI3 establishment on SACCH */
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), ''O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_est_ind));
}

/* test if RLL EST REQ trigeres SABM on Um; UA on Um triggers EST CONF (TS 48.058 3.2) */
private function f_TC_rll_est_req(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;
	var L1ctlDlMessage dl;
	timer T := 3.0;

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* Send a RSL EST REQ for SAPI3 on main DCCH */
	RSL.send(ts_RSL_EST_REQ(g_chan_nr, tc.link_id));
	T.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, ?)) -> value dl {
		var LapdmFrame lapdm;
		var octetstring l2 := dl.payload.data_ind.payload;
		if (dl.dl_info.link_id.c == SACCH) {
			/* remove L1 header */
			l2 := substr(l2, 2, lengthof(l2)-2);
		}
		lapdm.ab := dec_LapdmFrameAB(l2);
		if (match(lapdm, tr_LAPDm_SABM(tc.sapi, cr_MT_CMD, true, ''O))) {
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] L1CTL.receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout waiting for SABM");
		mtc.stop;
		}
	}

	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_est_req_DCCH_3() runs on test_CT {
	var RllTestCases tcs := {
		/* normal SAPI3 establishment on main DCCH */
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), ''O, true))//,
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_est_req));
}
testcase TC_rll_est_req_ACCH_3() runs on test_CT {
	var RllTestCases tcs := {
		/* normal SAPI3 establishment on SACCH */
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), ''O, true))
	}
	f_rll_testmatrix(tcs, refers(f_TC_rll_est_req));
}

/* altstep to receive a LAPDm frame matching the given template */
private altstep as_l1_exp_lapdm(template LapdmFrame exp) runs on ConnHdlr {
	var L1ctlDlMessage dl;
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, ?)) -> value dl {
		var LapdmFrame lapdm;
		var octetstring l2 := dl.payload.data_ind.payload;
		if (dl.dl_info.link_id.c == SACCH) {
			/* remove L1 header */
			l2 := substr(l2, 2, lengthof(l2)-2);
		}
		if (ischosen(exp.ab)) {
			lapdm.ab := dec_LapdmFrameAB(l2);
		} else if (ischosen(exp.b4)) {
			lapdm.b4 := dec_LapdmFrameB4(l2);
		} else if (ischosen(exp.bbis)) {
			lapdm.bbis := dec_LapdmFrameBbis(l2);
		}
		log("Rx LAPDm ", lapdm);
		if (match(lapdm, exp)) {
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] L1CTL.receive { repeat; }
}
private function f_l1_exp_lapdm(template LapdmFrame exp, float t := 3.0) runs on ConnHdlr {
	timer T := t;
	T.start;
	alt {
	[] T.timeout {
		setverdict(fail, "Timeout waiting for LAPDm ", exp);
		mtc.stop;
		}
	[] as_l1_exp_lapdm(exp);
	}
}

/* establish one Radio Link Layer via SABM -> UA. Use l3 for contention resolution */
private function f_est_rll_mo(uint3_t sapi, RslLinkId link_id, octetstring l3) runs on ConnHdlr {
	/* send SABM from MS -> BTS */
	f_tx_lapdm(ts_LAPDm_SABM(sapi, cr_MO_CMD, true, l3), link_id);
	/* expect RLL EST IND on Abis */
	alt {
	[l3 != ''O] RSL.receive(tr_RSL_EST_IND(g_chan_nr, link_id, l3));
	[l3 == ''O] RSL.receive(tr_RSL_EST_IND_NOL3(g_chan_nr, link_id));
	[] RSL.receive(tr_RSL_ERROR_IND(g_chan_nr, link_id, ?)) {
		setverdict(fail, "Failing due to RSL_ERROR_IND");
		mtc.stop;
		}
	[] RSL.receive { repeat; }
	}
	/* expect UA from BTS -> MS */
	f_l1_exp_lapdm(tr_LAPDm_UA(sapi, cr_MT_RSP, true, l3));
}

/* test if DISC on Um triggers RLL REL IND (TS 48.058 3.3) */
private function f_TC_rll_rel_ind(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;

	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* first establish the link-layer */
	f_est_rll_mo(tc.sapi, tc.link_id, tc.l3);

	/* then send the DISC */
	f_tx_lapdm(ts_LAPDm_DISC(tc.sapi, cr_MO_CMD, true), tc.link_id);
	/* ... and expect the REL IND on the RSL side */
	alt {
	[] RSL.receive(tr_RSL_REL_IND(g_chan_nr, tc.link_id)) {
		setverdict(pass);
		}
	}

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_rel_ind_DCCH_0() runs on test_CT {
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), '01020304'O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_rel_ind));
}

testcase TC_rll_rel_ind_ACCH_0() runs on test_CT {
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_SACCH(0)), ''O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_rel_ind));
}
testcase TC_rll_rel_ind_DCCH_3() runs on test_CT {
	var RllTestCases tcs := {
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), ''O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_rel_ind));
}
testcase TC_rll_rel_ind_ACCH_3() runs on test_CT {
	var RllTestCases tcs := {
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), ''O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_rel_ind));
}

/* test if RLL REL REQ triggers DISC on Um; UA/DM triggers RLL REL CONF (TS 48.058 3.4) */
private function f_TC_rll_rel_req(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;
	f_l1_tune(L1CTL);
	RSL.clear;

	/* activate the logical channel */
	f_est_dchan();
	L1CTL.clear;

	/* first establish the link-layer */
	f_est_rll_mo(tc.sapi, tc.link_id, tc.l3);

	/* then send the REL REQ via RSL */
	RSL.send(ts_RSL_REL_REQ(g_chan_nr, tc.link_id, RSL_REL_MODE_NORMAL));
	/* ... and expect the DISC on the Um side */
	alt {
	[] as_l1_exp_lapdm(tr_LAPDm_DISC(tc.sapi, cr_MT_CMD, true))  {
		/* FIXME: send a UA in resposne to the DISC */
		}
	}

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_rel_req() runs on test_CT {
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), '01020304'O, true)),
		valueof(t_EITC(0, valueof(ts_RslLinkID_SACCH(0)), ''O, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), ''O, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), ''O, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_rel_req));
}

/* test if RLL DATA REQ triggers I-frames on Um (TS 48.058 3.5) */
testcase TC_rll_data_req() runs on test_CT {
}

/* test if I-frames on Um trigger RLL DATA IND (TS 48.058 3.6) */
testcase TC_rll_data_ind() runs on test_CT {
}

/* test if RLL UNIT DATA REQ triggers UI-frame on Um (TS 48.058 3.7) */
private function f_TC_rll_ud_req(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;

	f_l1_tune(L1CTL);
	RSL.clear;

	f_est_dchan();
	L1CTL.clear;

	/* Send UNITDATA REQ on RSL side */
	RSL.send(ts_RSL_UNITDATA_REQ(g_chan_nr, tc.link_id, tc.l3));
	/* Expect it to arrive on the other side */
	if (tc.link_id.c == SACCH) {
		f_l1_exp_lapdm(tr_LAPDm_B4_UI(tc.sapi, cr_MT_CMD, tc.l3));
	} else {
		f_l1_exp_lapdm(tr_LAPDm_UI(tc.sapi, cr_MT_CMD, tc.l3));
	}

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_unit_data_req_DCCH() runs on test_CT {
	var octetstring l3 := f_rnd_octstring(15);
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), l3, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), l3, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_ud_req));
}
testcase TC_rll_unit_data_req_ACCH() runs on test_CT {
	var octetstring l3 := f_rnd_octstring(19);
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_SACCH(0)), l3, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), l3, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_ud_req));
}

/* test if UI-frames on Um trigger RLL UNIT DATA IND (TS 48.058 3.8) */
private function f_TC_rll_ud_ind(charstring id) runs on ConnHdlr {
	var RllTestCase tc := g_pars.spec.rll;

	f_l1_tune(L1CTL);
	RSL.clear;

	f_est_dchan();
	L1CTL.clear;

	/* Send LAPDm UI frame. There is no B4 format in uplink! */
	f_tx_lapdm(ts_LAPDm_UI(tc.sapi, cr_MO_CMD, tc.l3), tc.link_id);
	/* Expdct RLL UNITDATA IND on RSL side */
	alt {
	[] RSL.receive(tr_RSL_UNITDATA_IND(g_chan_nr, tc.link_id, tc.l3)) {
		setverdict(pass);
		}
	[] RSL.receive { repeat; }
	}

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_rll_unit_data_ind_DCCH() runs on test_CT {
	var octetstring l3 := f_rnd_octstring(20);
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_DCCH(0)), l3, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_DCCH(3)), l3, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_ud_ind));
}
testcase TC_rll_unit_data_ind_ACCH() runs on test_CT {
	var octetstring l3 := f_rnd_octstring(18);
	var RllTestCases tcs := {
		valueof(t_EITC(0, valueof(ts_RslLinkID_SACCH(0)), l3, true)),
		valueof(t_EITC(3, valueof(ts_RslLinkID_SACCH(3)), l3, true))
	};
	f_rll_testmatrix(tcs, refers(f_TC_rll_ud_ind));
}

/***********************************************************************
 * Encryption Related
 ***********************************************************************/

/* send UNITDATA_REQ from BTS to MS and expect it to arrive */
function f_unitdata_mt(RslLinkId link_id, octetstring l3) runs on ConnHdlr {
	RSL.send(ts_RSL_UNITDATA_REQ(g_chan_nr, link_id, l3));
	if (link_id.c == SACCH) {
		f_l1_exp_lapdm(tr_LAPDm_B4_UI(link_id.sapi, cr_MT_CMD, l3));
	} else {
		f_l1_exp_lapdm(tr_LAPDm_UI(link_id.sapi, cr_MT_CMD, l3));
	}
}

/* Expect (or not expect) other kinds of messages */
private altstep as_rsl_any_ind(boolean exp_any) runs on ConnHdlr {
	[exp_any] RSL.receive { repeat; }
	[not exp_any] RSL.receive {
		setverdict(fail, "Unexpected RSL message!");
		mtc.stop;
		}
}

/* Send UI frame from MS and expect it to arrive as RLL UNITDATA IND on Abis */
private function f_unitdata_mo(
	RslLinkId link_id,
	octetstring l3,
	boolean exp_sacch := true, /* Should tolerate SACCH messages? */
	boolean exp_any := false /* Should tolerate any other RSL messages? */
) runs on ConnHdlr {
	timer T := 3.0;
	f_tx_lapdm(ts_LAPDm_UI(link_id.sapi, cr_MO_CMD, l3), link_id);
	T.start;
	/* Expect RLL UNITDATA IND on RSL side */
	alt {
	[] RSL.receive(tr_RSL_UNITDATA_IND(g_chan_nr, link_id, l3)) {
		setverdict(pass);
		}
	[exp_sacch] as_meas_res(verify_meas := false);
	[] as_rsl_any_ind(exp_any);
	[] T.timeout {
		setverdict(fail, "Timeout waiting for UNIT_DATA_IND");
		mtc.stop;
		}
	}
}

/* Send I-frame from MS and expect it to arrive as RLL DATA IND on Abis */
private function f_data_mo(
	RslLinkId link_id,
	boolean p, uint3_t nr, uint3_t ns,
	octetstring l3,
	boolean exp_sacch := true, /* Should tolerate SACCH messages? */
	boolean exp_any := false /* Should tolerate any other RSL messages? */
) runs on ConnHdlr {
	timer T := 3.0;
	f_tx_lapdm(ts_LAPDm_I(link_id.sapi, cr_MO_CMD, p, nr, ns, l3), link_id);
	T.start;
	/* Expect RLL DATA IND on RSL side */
	alt {
	[] RSL.receive(tr_RSL_DATA_IND(g_chan_nr, link_id, l3)) {
		setverdict(pass);
		}
	[exp_sacch] as_meas_res(verify_meas := false);
	[] as_rsl_any_ind(exp_any);
	[] T.timeout {
		setverdict(fail, "Timeout waiting for DATA_IND");
		mtc.stop;
		}
	}
}

/* Test channel activation with A5/n right from the beginning (like in assignment + hand-over) */
function f_TC_chan_act_encr(charstring id) runs on ConnHdlr {
	f_l1_tune(L1CTL);
	f_est_dchan(true);

	/* now we actually need to transmit some data both ways to check if the encryption works */
	var L1ctlDlMessage dl;

	var octetstring l3 := f_rnd_octstring(20);
	var RslLinkId link_id := valueof(ts_RslLinkID_DCCH(0));

	/* send UNITDATA_REQ from BTS to MS and expect it to arrive */
	f_unitdata_mt(link_id, l3);

	/* Send UI frame from MS and expect it to arrive as RLL UNITDATA IND on Abis */
	f_unitdata_mo(link_id, l3);

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_chan_act_a51() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_1, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_chan_act_encr));
}
testcase TC_chan_act_a52() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_2, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_chan_act_encr));
}
testcase TC_chan_act_a53() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_3, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_chan_act_encr));
}


/* Test unencrypted channel activation followed by explicit ENCR CMD later */
function f_TC_encr_cmd(charstring id) runs on ConnHdlr {
	/* L3 payload doesn't matter, as it is passed transparently */
	var BIT3 l3_alg_id := f_alg_id_to_l3(g_pars.encr.alg_id);
	var octetstring l3 := enc_PDU_ML3_NW_MS(valueof(ts_RRM_CiphModeCmd(l3_alg_id)));
	var RslLinkId link_id := valueof(ts_RslLinkID_DCCH(0));

	f_l1_tune(L1CTL);

	/* first establish a dedicated channel in the clear */
	f_est_dchan(false);

	/* Establish ABM */
	f_est_rll_mo(link_id.sapi, link_id, '23420815'O);

	/* then send the RSL ENCR CMD with an actual RR CIPH MOD CMD inside */
	RSL.send(ts_RSL_ENCR_CMD(g_chan_nr, link_id, g_pars.encr.alg_id, g_pars.encr.key, l3));
	/* expect the L3 to arrive still unencrypted on the MS side */
	f_l1_exp_lapdm(tr_LAPDm_I(link_id.sapi, cr_MT_CMD, ?, ?, ?, l3));

	/* configure L1 to apply ciphering */
	var uint8_t alg_id := f_alg_id_to_l1ctl(g_pars.encr.alg_id);
	f_L1CTL_CRYPTO_REQ(L1CTL, g_pars.chan_nr, alg_id, g_pars.encr.key);

	/* send first ciphered I-frame in response and expect it on RSL */
	f_data_mo(link_id, true, 1, 0, '0a0b0c0d'O, exp_sacch := true);

	/* now the BTS code should have detected the first properly encrypted uplink I-frame,
	 * and hence enable encryption also on the downlink */

	/* expect bi-directional communication work in encrypted mode */
	f_unitdata_mo(link_id, f_rnd_octstring(15));
	f_unitdata_mt(link_id, f_rnd_octstring(15));

	/* release the channel */
	f_rsl_chan_deact();
	f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
	f_rslem_unregister(0, g_chan_nr);
}
testcase TC_encr_cmd_a51() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_1, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_encr_cmd));
}
testcase TC_encr_cmd_a52() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_2, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_encr_cmd));
}
testcase TC_encr_cmd_a53() runs on test_CT {
	var ConnHdlrPars pars := valueof(t_Pars(t_RslChanNr_Bm(1), ts_RSL_ChanMode_SIGN));
	pars.encr := valueof(ts_RSL_IE_EncrInfo(RSL_ALG_ID_A5_3, f_rnd_octstring(8)));
	f_testmatrix_each_chan(pars, refers(f_TC_encr_cmd));
}

private function f_assert_lapdm(octetstring enc, template LapdmFrame exp_match, charstring name := "") {
	var LapdmFrame lf;
	var octetstring reenc;

	/* decode the LAPDm frame */
	if (ischosen(exp_match.ab)) {
		lf.ab := dec_LapdmFrameAB(enc);
	} else {
		setverdict(fail, "unsupported frame type");
		mtc.stop;
	}

	/* check if decoder result matches expectation */
	if (not match(lf, exp_match)) {
		setverdict(fail, name, ": decoded LAPDm doesn't match");
		mtc.stop;
	} else {
		log(name, ": matched");
		setverdict(pass);
	}

	/* test if re-encoded frame equals original input */
	reenc := enc_LapdmFrame(lf);
	if (enc != reenc) {
		setverdict(fail, name, ": re-encoded LAPDm frame doesn't match");
		mtc.stop;
	} else {
		setverdict(pass);
	}
}

testcase TC_lapdm_selftest() runs on test_CT {
	f_assert_lapdm('030301'O, tr_LAPDm_UI(0, true, ''O), "ui_s0_empty");
	f_assert_lapdm('0F0301'O, tr_LAPDm_UI(3, true, ''O), "ui_s3_empty");
	f_assert_lapdm('013F01'O, tr_LAPDm_SABM(0, false, true, ''O), "sabm_s0_empty");
	f_assert_lapdm('013F1123420815'O, tr_LAPDm_SABM(0, false, true, '23420815'O), "sabm_s0_l3");
	f_assert_lapdm('03E101'O, tr_LAPDm_RR(0, true, false, 7), "rr_s0_7");
	f_assert_lapdm('03000d063505'O, tr_LAPDm_I(0, true, false, 0, 0, '063505'O), "I/0/0");
	f_assert_lapdm('03e00d063505'O, tr_LAPDm_I(0, true, false, 7, 0, '063505'O), "I/7/0");
}

/***********************************************************************
 * DTX Related (see GSM 05.08, section 8.3)
 ***********************************************************************/

/* XXX These functions must be kept in sync with g_AllChannels defined on test_CT. */
function f_g_chan_is_tchf() runs on ConnHdlr return boolean {
	return (g_chan_nr == valueof(ts_RslChanNr_Bm(1)) or
		g_chan_nr == valueof(ts_RslChanNr_Bm(2)) or
		g_chan_nr == valueof(ts_RslChanNr_Bm(3)) or
		g_chan_nr == valueof(ts_RslChanNr_Bm(4)));
}
function f_g_chan_is_tchh() runs on ConnHdlr return boolean {
	return (g_chan_nr == valueof(ts_RslChanNr_Lm(5,0)) or
		g_chan_nr == valueof(ts_RslChanNr_Lm(5,1)));
}
function f_g_chan_is_sdcch4() runs on ConnHdlr return boolean {
	return (g_chan_nr == valueof(ts_RslChanNr_SDCCH4(0,0)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH4(0,1)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH4(0,2)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH4(0,3)));
}
function f_g_chan_is_sdcch8() runs on ConnHdlr return boolean {
	return (g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,0)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,1)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,2)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,3)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,4)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,5)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,6)) or
		g_chan_nr == valueof(ts_RslChanNr_SDCCH8(6,7)));
}

function f_test_l2_fill_frames(boolean dtxd) runs on ConnHdlr {
	var L1ctlDlMessage dl;
	var octetstring l2_fill_frame := '0303012B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B'O;
	var octetstring l2_fill_frame_sacch := substr(l2_fill_frame, 0, lengthof(l2_fill_frame) - 2);
	var GsmFrameNumber first_fn;
	var boolean is_first_frame := true;
	var integer nfill_frames_sacch := 0;
	var integer nfill_frames_nonsacch := 0;
	var integer expected_fill_frames := 10000; /* initial value causes test failure if not overridden */
	/* Frames numbers (mod 104) for which a fill frame is expected on TCHF if DTX is enabled. */
	var Integers required_tdma_frames_dtx_tchf := { 52, 53, 54, 55, 56, 57, 58, 59 };
	const integer frame_dtx_tchf_mod := 104;
	/* Frame numbers (mod 104) for which a fill frame is expected at the L1SAP level,
	 * which operates in terms of blocks rather than frames. */
	var Integers required_tdma_blocks_dtx_tchf := { 52, 56 };
	const integer block_dtx_tchf_mod := 26;
	timer T := 5.0;

	f_l1_tune(L1CTL);
	RSL.clear;
	L1CTL.clear;

	/* activate TCHF signalling channel */
	f_est_dchan(false);

	T.start;
	alt {
	[] L1CTL.receive(tr_L1CTL_DATA_IND(g_chan_nr, ?)) -> value dl {
		var GsmFrameNumber fn := dl.dl_info.frame_nr;
		var octetstring l2 := dl.payload.data_ind.payload;

		if (is_first_frame) {
			is_first_frame := false;
			first_fn := dl.dl_info.frame_nr;
		}

		if (dl.dl_info.link_id.c == SACCH) {
			l2 := substr(l2, 2, lengthof(l2) - 2); /* remove L1 header */
			if (not match(l2_fill_frame_sacch, l2)) {
				repeat;
			}
		} else if (not match(l2_fill_frame, l2)) {
			repeat;
		}

		if (dtxd) {
			if (not f_g_chan_is_tchf()) {
				T.stop;
				f_rsl_chan_deact();
				f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
				setverdict(fail, "Received fill frame on non-TCH/F channel; DTX is only allowed on TCH/F!");
			}
			if (fn > first_fn + frame_dtx_tchf_mod) {
				T.stop;
				f_rsl_chan_deact();
				f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);

				/* With DTX enabled we can expect at least 3 fill frames for every 104 frames.
				 * 2 SACCH, 1 TCH/F */
				expected_fill_frames := 3;

				if (nfill_frames_sacch + nfill_frames_nonsacch < expected_fill_frames) {
					log("received only ", nfill_frames_sacch, "+", nfill_frames_nonsacch,
					    " (SACCH+other) out of ", expected_fill_frames, " expected fill frames");
					setverdict(fail, "Not enough fill frames received");
				} else {
					setverdict(pass);
				}
			} else {
				if (dl.dl_info.link_id.c == SACCH) {
					nfill_frames_sacch := nfill_frames_sacch + 1;
					repeat;
				}
				/* On DTX TCH/F channels, fill frames occur only for specific frame numbers mod 104.
				 * Furthermore, the L1SAP layer gives us frame numbers for the start of a block so
				 * we should only see the subset of frames numbers which correspond to a block boundary.
				 * TCH/F blocks are defined to start at 0,4,8,13,17,21 (modulo 26) */
				for (var integer i := 0; i < lengthof(required_tdma_blocks_dtx_tchf); i := i + 1) {
					if (fn mod frame_dtx_tchf_mod == required_tdma_blocks_dtx_tchf[i]) {
						nfill_frames_nonsacch := nfill_frames_nonsacch + 1;
						repeat;
					}
				}
				log("Received DTX TCH fill frame with bad frame number: ", fn,
				    " (mod ", frame_dtx_tchf_mod, ": ", fn mod frame_dtx_tchf_mod, ")",
				    " (mod ", block_dtx_tchf_mod, ": ", fn mod block_dtx_tchf_mod, ")");
				f_rsl_chan_deact();
				f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
				setverdict(fail, "Unexpected L2 fill frame received on Um");
			}
		} else {
			if (dl.dl_info.link_id.c == SACCH) {
				nfill_frames_sacch := nfill_frames_sacch + 1;
			} else {
				nfill_frames_nonsacch := nfill_frames_nonsacch + 1;
			}
			if (fn > first_fn + frame_dtx_tchf_mod) {
				T.stop;
				if (f_g_chan_is_tchf()) {
					/* Without DTX we can expect 25 fill frames for every 104 frames.
					 * (24 FACCH + 1 SACCH filling) */
					 expected_fill_frames := 25;
				} else if (f_g_chan_is_tchh()) {
					/* We can expect 2 fill frames for every 104 frames. */
					 expected_fill_frames := 2;
				} else if (f_g_chan_is_sdcch4() or f_g_chan_is_sdcch8()) {
					/* We can expect 5 fill frames for every 104 frames. */
					 expected_fill_frames := 5;
				} else {
					f_rsl_chan_deact();
					f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
					setverdict(fail, "Unknown channel type");
				}

				f_rsl_chan_deact();
				f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);

				if (nfill_frames_sacch + nfill_frames_nonsacch >= expected_fill_frames) {
					setverdict(pass);
				} else {
					log("received only ", nfill_frames_sacch, "+", nfill_frames_nonsacch,
					    " (SACCH+other) out of ", expected_fill_frames, " expected fill frames");
					setverdict(fail, "Not enough fill frames received");
				}
			} else {
				repeat;
			}
		}
	}
	[] L1CTL.receive { repeat; }
	[] T.timeout {
		f_rsl_chan_deact();
		f_L1CTL_DM_REL_REQ(L1CTL, g_chan_nr);
		setverdict(fail, "Timeout waiting for L2 fill frames on Um");
		mtc.stop;
	}
	}
}

function f_TC_tch_sign_l2_fill_frame(charstring id) runs on ConnHdlr {
	f_test_l2_fill_frames(false);
}

function f_TC_tch_sign_l2_fill_frame_dtxd(charstring id) runs on ConnHdlr {
	f_test_l2_fill_frames(true);
}

function f_tch_sign_l2_fill_frame(boolean dtxd) runs on test_CT {
	var ConnHdlr vc_conn;
	var ConnHdlrPars pars;
	pars.t_guard := 60.0;
	f_init(testcasename());
	for (var integer i := 0; i < sizeof(g_AllChannels); i := i + 1) {
		pars := valueof(t_Pars(g_AllChannels[i], ts_RSL_ChanMode_SIGN(dtxd)));
		if (dtxd) {
			if (i >= 4) { /* DTX is only allowed on TCH/F */
				break;
			}
			vc_conn := f_start_handler(refers(f_TC_tch_sign_l2_fill_frame_dtxd), pars);
		} else {
			vc_conn := f_start_handler(refers(f_TC_tch_sign_l2_fill_frame), pars);
		}
		vc_conn.done;
	}
}

/* Verify that L2 fill frames are sent on TCH in signaling mode if
 * there is nothing to transmit while DTX is disabled on downlink. */
testcase TC_tch_sign_l2_fill_frame() runs on test_CT {
	f_tch_sign_l2_fill_frame(false);
}

/* Verify that particular L2 fill frames are sent on TCH in signaling mode if
 * there is nothing to transmit while DTX is enabled on downlink. */
testcase TC_tch_sign_l2_fill_frame_dtxd() runs on test_CT {
	f_tch_sign_l2_fill_frame(true);
}

/* test generation of RLL ERR IND based on Um errors (TS 48.058 3.9) */
/*	protocol error as per 44.006 */
/*	link layer failure (repetition of I-frame N200 times without ACK */
/*	repetition of SABM or DISC N200 times without ACK */
/*	receptiom of SABM in multi-frame established state */


/* TODO Areas:

* channel activation
** with BS_Power / MS_Power, bypassing power control loop
** on primary vs. secondary TRX
** with timing advance from initial activation on
* mode modify
** encryption
** multirate
* check DEACTIVATE SACCH
** unsupported algorithm
* handover detection
* MS Power Control
* BS Power Control
* Physical Context
* CCCH Load Indication for RACH
* SMS Broadcast Req / Cmd / CBCH LOad Ind
* RF resource ind
* error handling
** discriminator error
** type error
** sequence error
** IE duplicated?
* PCU interface
** TIME_IND from BTS->PCU
** DATA_IND from BTS->PCU
** verification of PCU-originated DATA_REQ arrival on Um/MS side

*/

control {
	execute( TC_chan_act_stress() );
	execute( TC_chan_act_react() );
	execute( TC_chan_deact_not_active() );
	execute( TC_chan_act_wrong_nr() );
	execute( TC_deact_sacch() );
	execute( TC_sacch_filling() );
	execute( TC_sacch_info_mod() );
	execute( TC_sacch_multi() );
	execute( TC_sacch_multi_chg() );
	execute( TC_rach_content() );
	execute( TC_rach_count() );
	execute( TC_rach_max_ta() );
	execute( TC_meas_res_sign_tchf() );
	execute( TC_meas_res_sign_tchh() );
	execute( TC_meas_res_sign_sdcch4() );
	execute( TC_meas_res_sign_sdcch8() );
	execute( TC_meas_res_sign_tchh_toa256() );
	execute( TC_conn_fail_crit() );
	execute( TC_paging_imsi_80percent() );
	execute( TC_paging_tmsi_80percent() );
	execute( TC_paging_imsi_200percent() );
	execute( TC_paging_tmsi_200percent() );
	execute( TC_rsl_protocol_error() );
	execute( TC_rsl_mand_ie_error() );
	execute( TC_rsl_ie_content_error() );
	execute( TC_si_sched_default() );
	execute( TC_si_sched_1() );
	execute( TC_si_sched_2bis() );
	execute( TC_si_sched_2ter() );
	execute( TC_si_sched_2ter_2bis() );
	execute( TC_si_sched_2quater() );
	execute( TC_si_sched_13() );
	execute( TC_si_sched_13_2bis_2ter_2quater() );
	execute( TC_ipa_dlcx_not_active() );
	execute( TC_ipa_crcx_twice_not_active() );
	execute( TC_ipa_crcx_mdcx_dlcx_not_active() );
	execute( TC_ipa_crcx_mdcx_mdcx_dlcx_not_active() );
	execute( TC_ipa_crcx_sdcch_not_active() );

	execute( TC_pcu_act_req() );
	execute( TC_pcu_act_req_wrong_ts() );
	execute( TC_pcu_act_req_wrong_bts() );
	execute( TC_pcu_act_req_wrong_trx() );
	execute( TC_pcu_deact_req() );
	execute( TC_pcu_deact_req_wrong_ts() );
	execute( TC_pcu_ver_si13() );
	execute( TC_pcu_data_req_wrong_bts() );
	execute( TC_pcu_data_req_wrong_trx() );
	execute( TC_pcu_data_req_wrong_ts() );
	execute( TC_pcu_data_req_ts_inactive() );
	execute( TC_pcu_data_req_pdtch() );
	execute( TC_pcu_data_req_ptcch() );
	execute( TC_pcu_data_req_agch() );
	execute( TC_pcu_data_req_imm_ass_pch() );
	execute( TC_pcu_rach_content() );
	execute( TC_pcu_paging_from_rsl() );

	execute( TC_dyn_osmo_pdch_act_deact() );
	execute( TC_dyn_osmo_pdch_unsol_deact() );
	execute( TC_dyn_osmo_pdch_double_act() );
	execute( TC_dyn_osmo_pdch_tchf_act() );
	execute( TC_dyn_osmo_pdch_tchh_act() );
	execute( TC_dyn_ipa_pdch_act_deact() );
	execute( TC_dyn_ipa_pdch_tchf_act() );
	execute( TC_dyn_ipa_pdch_tchf_act_pdch_act_nack() );
	execute( TC_dyn_ipa_pdch_act_tchf_act_nack() );

	execute( TC_rll_est_ind() );
	execute( TC_rll_est_req_DCCH_3() );
	execute( TC_rll_est_req_ACCH_3() );
	execute( TC_rll_rel_ind_DCCH_0() );
	execute( TC_rll_rel_ind_DCCH_3() );
	execute( TC_rll_rel_ind_ACCH_0() );
	execute( TC_rll_rel_ind_ACCH_3() );
	execute( TC_rll_rel_req() );
	execute( TC_rll_unit_data_req_DCCH() );
	execute( TC_rll_unit_data_req_ACCH() );
	execute( TC_rll_unit_data_ind_DCCH() );
	execute( TC_rll_unit_data_ind_ACCH() );

	execute( TC_chan_act_a51() );
	execute( TC_chan_act_a52() );
	execute( TC_chan_act_a53() );
	execute( TC_encr_cmd_a51() );
	execute( TC_encr_cmd_a52() );
	execute( TC_encr_cmd_a53() );

	execute( TC_lapdm_selftest() );

	execute( TC_tch_sign_l2_fill_frame() );
	execute( TC_tch_sign_l2_fill_frame_dtxd() );
}


}