bts/BTS_Tests.ttcn

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_RR_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 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 .. TS 4: TCH/F
 * 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;
	integer mp_bb_trxc_port := 5704;
	charstring mp_pcu_socket := PCU_SOCK_DEFAULT;
}

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;

	port TELNETasp_PT BTSVTY;

	/* 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
	};
}

/* 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;
}

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
}

template (value) RachControlParameters ts_RachCtrl_default := {
	max_retrans := RACH_MAX_RETRANS_1,
	tx_integer := '0000'B, /* 3 slots */
	cell_barr_access := false,
	re_not_allowed := true,
	acc := '1111111111111111'B
};

template (value) CellSelectionParameters ts_CellSelPar_default := {
	cell_resel_hyst_2dB := 0,
	ms_txpwr_max_cch := 0,
	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 := t_RrHeader(SYSTEM_INFORMATION_TYPE_3, 0),
	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 := 4/4
			},
			cell_sel_par := ts_CellSelPar_default,
			rach_control := ts_RachCtrl_default,
			rest_octets := ''O
		}
	}
}

template (value) SystemInformation ts_SI2_default := {
	header := t_RrHeader(SYSTEM_INFORMATION_TYPE_2, 0),
	payload := {
		si2 := {
			bcch_freq_list := '00000000000000000000000000000000'O,
			ncc_permitted := '11111111'B,
			rach_control := ts_RachCtrl_default
		}
	}
}

template (value) SystemInformation ts_SI4_default := {
	header := t_RrHeader(SYSTEM_INFORMATION_TYPE_4, 0),
	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");
}

/* PCU socket may at any time receive a new INFO.ind */
private altstep as_pcu_info_ind() runs on test_CT {
	var PCUIF_send_data sd;
	[] PCU.receive(t_SD_PCUIF_MSGT(g_pcu_conn_id, PCU_IF_MSG_INFO_IND)) -> value sd {
		g_pcu_last_info := sd.data;
		repeat;
		}
}

private function f_init_pcu(charstring id) runs on test_CT {
	timer T := 2.0;
	var PCUIF_send_data sd;
	map(self:PCU, system:PCU);
	g_pcu_conn_id := f_pcuif_connect(PCU, mp_pcu_socket);

	T.start;
	alt {
	[] PCU.receive(t_SD_PCUIF_MSGT(g_pcu_conn_id, PCU_IF_MSG_INFO_IND)) -> value sd {
		g_pcu_last_info := sd.data;
		}
	[] T.timeout {
		setverdict(fail, "Timeout waiting for PCU INFO_IND");
		self.stop;
		}
	}
}

/* global init function */
function f_init(charstring id := "BTS-Test") runs on test_CT {
	f_init_rsl(id);
	RSL_CCHAN.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_UP});
	f_sleep(0.5);	/* workaround for OS#3000 */
	f_init_vty(id);

	/* 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);

	f_init_pcu(id);

	/* start with a default moderate timing offset equalling TA=2 */
	f_main_trxc_connect();
	BB_TRXC.send(ts_TRXC_Send(g_bb_trxc_conn_id, ts_TRXC_FAKE_TIMING(2*256)));
}

/* 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)
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);

	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");
		self.stop;
	}
}

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

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, "127.0.0.1", mp_bb_trxc_port,
							"127.0.0.1", 0, -1, {udp:={}}, {});
	g_bb_trxc_conn_id := res.connId;
}

private function f_trxc_fake_rssi(uint8_t rssi) runs on ConnHdlr {
	BB_TRXC.send(ts_TRXC_Send(g_bb_trxc_conn_id, ts_TRXC_FAKE_RSSI(rssi))); 
}

private function f_trx_fake_toffs256(int16_t toffs256) runs on ConnHdlr {
	BB_TRXC.send(ts_TRXC_Send(g_bb_trxc_conn_id, 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);

	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(template RSL_Message tx, template RSL_Message exp_rx, charstring id)
runs on ConnHdlr {
	timer T := 3.0;
	RSL.send(tx);
	T.start;
	alt {
	[] RSL.receive(exp_rx) {
		T.stop;
		setverdict(pass);
		}
	[] T.timeout {
		setverdict(fail, "Timeout expecting " & id);
		self.stop;
		}
	[] RSL.receive {
		setverdict(fail, "Unexpected RSL message received");
		}
	}
}

function f_rsl_chan_act(RSL_IE_ChannelMode mode) runs on ConnHdlr {
	f_rsl_transceive(ts_RSL_CHAN_ACT(g_chan_nr, mode), 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");
}

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 := 0,
		bs_power_level := 0,
		ms_power_level := 0,
		ms_actual_ta := 0
	}
}

/***********************************************************************
 * 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;
}

/* 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");
		}
	[] 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(testcasename());
	vc_conn := f_start_handler(refers(f_TC_chan_act_react), pars);
	vc_conn.done;
}

/* 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");
		}
	}
}
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(testcasename());
	var ConnHdlr vc_conn := f_start_handler(refers(f_TC_chan_deact_not_active), pars);
	vc_conn.done;
}

/* 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");
		}
	[] 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(testcasename());

	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;
	}
}

/***********************************************************************
 * 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?!?");
			self.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");
			self.stop;
			}
		[] RSL_CCHAN.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for CHAN RQD");
			self.stop;
			}
		}
	}
	setverdict(pass);
}

/* Send 1000 RACH Requests (flood ~ 89/s) and count if count(Abis) == count(Um) */
testcase TC_rach_count() 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?!?");
			self.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");
	}
}

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, "127.0.0.1", mp_bb_trxc_port,
							"127.0.0.1", 0, -1, {udp:={}}, {});
	g_bb_trxc_conn_id := res.connId;
}

private function f_rach_toffs(int16_t toffs256, boolean expect_pass) runs on test_CT {
	/* tell fake_trx to use a given timing offset for all bursts */
	BB_TRXC.send(ts_TRXC_Send(g_bb_trxc_conn_id, 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");
		}
	[] RSL_CCHAN.receive { repeat; }
	[not expect_pass] T.timeout {
		setverdict(pass);
		}
	[expect_pass] T.timeout {
		setverdict(fail, "Timeout waiting for CHAN RQD");
		}
	}
}

/* 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 */

	/* negative TA must not happen */
	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);
}

/***********************************************************************
 * 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 LapdmFrameB ts_LAPDm_B(LapdmSapi sapi, boolean c_r, boolean p, octetstring pl) := {
	addr := ts_LapdmAddr(sapi, c_r),
	ctrl := t_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(t_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 LapdmFrameB lb := valueof(ts_LAPDm_B(0, false, false, enc_GsmRrL3Message(meas_rep)));
		log("LAPDm: ", lb);
		var octetstring pl := '0000'O & enc_LapdmFrameB(lb);
		L1CTL.send(t_L1CTL_DATA_REQ(g_chan_nr, ts_RslLinkID_SACCH(0), pl));
		repeat;
		}
}

altstep as_l1_dcch() runs on ConnHdlr {
	var L1ctlDlMessage l1_dl;
	[] L1CTL.receive(t_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(t_L1CTL_DATA_REQ(g_chan_nr, ts_RslLinkID_DCCH(0), pl));
		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);
}

/* 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 := l1p.meas_ul.full.rxlev,
		reserved1 := '00'B,
		rxlev_s_u := l1p.meas_ul.sub.rxlev,
		reserved2 := '00'B,
		rxq_f_u := l1p.meas_ul.full.rxqual,
		rxq_s_u := l1p.meas_ul.sub.rxqual,
		supp_meas_info := omit
	};
	if (l1p.toa256_enabled) {
		ul_meas.len := 5;
		ul_meas.supp_meas_info := int2oct(l1p.timing_offset_256syms, 2);
	}
	/* 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 := l1p.ms_actual_ta
	};
	var uint8_t offs := toffs256s_to_rsl(l1p.timing_offset_256syms);
	var template uint8_t t_toffs := (offs-1 .. offs+1);	 /* some tolerance */
	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() runs on ConnHdlr {
	var RSL_Message rsl;
	[] 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 {
		setverdict(fail, "Received unspecific MEAS RES ", rsl);
		self.stop;
		}
	[] RSL.receive(tr_RSL_MEAS_RES(?)) -> value rsl {
		setverdict(fail, "Received unexpected MEAS RES ", rsl);
		self.stop;
		}
	[] g_Tmeas_exp.timeout {
		setverdict(fail, "Didn't receive expected measurement result")
		self.stop;
		}
}

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

	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);

	/* 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);
}

/* 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;
	f_trxc_fake_rssi(100);

	g_pars.l1_pars.timing_offset_256syms := 512; /* 2 symbols */
	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) / self.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");
		}
	}
	f_rsl_chan_deact();
}
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;
	}
}
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;
	}
}
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;
	}
}
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;
	}
}
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;
	}
}


/* Test if a channel without valid uplink bursts generates RSL CONN FAIL IND */
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(t_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");
		}
	}
	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;
	}
}

altstep as_l1_count_paging(inout integer num_paging_rcv_msgs, inout integer num_paging_rcv_ids)
runs on test_CT {
	var L1ctlDlMessage dl;
	[] L1CTL.receive(t_L1CTL_DATA_IND(t_RslChanNr_PCH_AGCH(0), ?, c_DummyUI)) {
		repeat;
	}
	[] L1CTL.receive(t_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);
		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;
	log("pch_blocks_per_sec=", pch_blocks_per_sec, " interval=", interval);

	for (var integer i := 0; i < float2int(20.0/interval); i := i+1) {
		/* 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(i)));
		}
		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, i mod 4)));
		st.num_paging_sent := st.num_paging_sent + 1;

		/* Wait for interval to next PAGING COMMAND */
		timer T_itv := interval;
		T_itv.start;
		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");
			}
		[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);
		[] L1CTL.receive { repeat; }
		[] T_itv.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);
	[] 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");
		}
	[] 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 PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := 1,
		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);
	}
}

/* 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 PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := 1,
		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);
	}
}

/* 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 PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := 1,
		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*80/100 .. 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);
	}
}

/* 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 PagingTestCfg cfg := {
		combined_ccch := true,
		bs_ag_blks_res := 1,
		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*68/100 .. 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);
	}
}


/***********************************************************************
 * Immediate Assignment / AGCH
 ***********************************************************************/

testcase TC_imm_ass() runs on test_CT {
	f_init(testcasename());
	for (var integer i := 0; i < 1000; i := i+1) {
		var octetstring ia_enc := f_rnd_octstring(8);
		RSL_CCHAN.send(ts_RSL_UD(ts_RSL_IMM_ASSIGN(ia_enc, 0)));
		f_sleep(0.02);
	}
	/* FIXME: check if imm.ass arrive on Um side */
	/* FIXME: check for DELETE INDICATION */
	f_sleep(100.0);
}

/***********************************************************************
 * 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, "!");
	}
}

/* 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");
		self.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, "!");
	}
}

/* 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, "!");
	}
}

/* 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=0!");
		}
	}
	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");
		}
	}
	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!");
		}
		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");
		}
		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!");
			}
		}
	}
	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!");
		}
		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(t_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();
	f_rsl_bcch_fill(RSL_SYSTEM_INFO_2, ts_SI2_default);
	f_rsl_bcch_fill(RSL_SYSTEM_INFO_4, ts_SI4_default);
	f_TC_si_sched();
}

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();
}

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();
}

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();
}

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();
}

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, fixme);
	f_TC_si_sched();
}

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, fixme);
	f_TC_si_sched();
}


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 */
}

/***********************************************************************
 * 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");
		}
	[] RSL_CCHAN.receive {
		repeat;
		}
	[] T.timeout {
		setverdict(fail, "Timeout waiting for RSL ERR REP");
		}
	}
}

/* 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?");
		self.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");
		self.stop;
		}
	[] PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_RTS_REQ)) {
		setverdict(fail, "RTS.req for wrong TRX/TS");
		self.stop;
		}
	[] PCU.receive { repeat; }
	[exp_success] T.timeout {
		setverdict(fail, "Timeout waiting for PCU RTS.req");
		}
	[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");
		self.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");
		self.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");
		}
	}
}

/* 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(t_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");
		}
	}
}

/* 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(t_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");
		}
	}
}

/* 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?!?");
			self.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");
			self.stop;
			}
		[] PCU.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for RACH IND");
			self.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");
			self.stop;
			}
		[] PCU.receive { repeat; }
		[] T.timeout {
			setverdict(fail, "Timeout waiting for PAGING REQ");
			self.stop;
			}
		}
	}
	setverdict(pass);
}


/* TODO Areas:

* channel activation
** with BS_Power / MS_Power, bypassing power control loop
** on primary vs. secondary TRX
** with encryption from initial activation on
** with timing advance from initial activation on
* mode modify
** encryption
** multirate
* check DEACTIVATE SACCH
* encryption command / intricate logic about tx-only/tx+rx/...
** unsupported algorithm
* handover detection
* MS Power Control
* BS Power Control
* Physical Context
* SACCH info modify
* CCCH Load Indication for PCH and RACH
* Delete Indication on AGCH overflow
* 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_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_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() );
}


}