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

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;
}

/* 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
}

/* Default SYSTEM INFORMATION 3 */
template (value) GsmRrMessage ts_SI3_default := {
	header := t_RrHeader(SYSTEM_INFORMATION_TYPE_3, 0),
	payload := {
		si3 := {
			cell_id := 23,
			lai := {
				mcc_mnc := '262F42'H,
				lac := 42
			},
			ctrl_chan_desc := {
				msc_r99 := true,
				att := true,
				bs_ag_blks_res := 1,
				ccch_conf := CCHAN_DESC_1CCCH_COMBINED,
				si22_ind := false,
				cbq3 := CBQ3_IU_MODE_NOT_SUPPORTED,
				spare := '00'B,
				bs_pa_mfrms := 0, /* 2 multiframes */
				t3212 := 1 /* 6 minutes */
			},
			cell_opts := {
				dn_ind := false,
				pwrc := false,
				dtx := MS_MAY_USE_UL_DTX,
				radio_link_tout_div4 := 4/4
			},
			cell_sel_pars := {
				cell_resel_hyst_2dB := 0,
				ms_txpwr_max_cch := 0,
				acs := '0'B,
				neci := true,
				rxlev_access_min := 0
			},
			rach_ctrl_pars := {
				max_retrans := RACH_MAX_RETRANS_1,
				tx_integer := '0000'B, /* 3 slots */
				cell_bar_access := false,
				re_not_allowed := true,
				acc := '1111111111111111'B
			},
			rest_octets := ''O
		}
	}
}

/* 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});

	/* Send SI3 to the BTS, it is needed for various computations */
	var GsmRrMessage si3 := valueof(ts_SI3_default);
	log("Sending SI3 ", si3);
	var octetstring si3_enc := enc_GsmRrMessage(si3);
	RSL_CCHAN.send(ts_RSL_UD(ts_RSL_BCCH_INFO(RSL_SYSTEM_INFO_3, si3_enc)));
}

/* 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,
		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
	}
}

/* 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;
	}
}

function f_TC_chan_req(charstring id) runs on ConnHdlr {
	f_l1_tune(L1CTL);

	RSL.clear;
	//L1.send(DCCH_establish_req:{ra := 23});
	/* This arrives on CCHAN, so we cannot test here */
	//RSL.receive(tr_RSL_CHAN_RQD(int2oct(23,1)));
}
testcase TC_chan_req() 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_req), pars);
	vc_conn.done;
}

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,
	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
	};
	/* 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 */
		g_Tmeas_exp.start;
		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;
	}
}

/* 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;
}

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);
	}
}


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);
}

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 */
}

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);
}

/* 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;
}

/* 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
* BCCH INFO (SI Broadcasting)
* CCCH Load Indication for PCH and RACH
* Delete Indication on AGCH overflow
* SMS Broadcast Req / Cmd / CBCH LOad Ind
* RF resource ind
* IPA/speech related commands
* error handling
* discriminator error
** type error
** sequence error
** IE duplicated?

*/

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_chan_req() );
	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_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_ipa_dlcx_not_active() );
}


}