bsc/BSC_Tests.ttcn

module BSC_Tests {

import from General_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from IPL4asp_Types all;

import from BSSAP_Types all;
import from BSSAP_Adapter all;
import from BSSAP_CodecPort all;
import from BSSMAP_Templates all;
import from IPA_Emulation all;
import from IPA_Types all;
import from RSL_Types all;

import from Osmocom_CTRL_Functions all;
import from Osmocom_CTRL_Types all;

import from MobileL3_CommonIE_Types all;
import from L3_Templates all;
import from GSM_RR_Types all;

import from RSL_Tests all;

const integer NUM_BTS := 3;
const float T3101_MAX := 12.0;

/* make sure to sync this with the osmo-bts.cfg you're using */
const integer NUM_TCHF_PER_BTS := 5;


/* BSC specific CTRL helper functions */
function f_ctrl_get_bts(IPA_CTRL_PT pt, integer bts_nr, charstring suffix) return CtrlValue {
	return f_ctrl_get(pt, "bts." & int2str(bts_nr) & "." & suffix);
}

template charstring ts_bts(integer bts_nr) := "bts." & int2str(bts_nr) & ".";
template charstring ts_bts_trx(integer bts_nr, integer trx_nr ) :=
	valueof(ts_bts(bts_nr)) & "trx." & int2str(trx_nr) & ".";

function f_ctrl_get_exp_bts(IPA_CTRL_PT pt, integer bts_nr, CtrlVariable suffix, template CtrlValue exp) {
	f_ctrl_get_exp(pt, valueof(ts_bts(bts_nr)) & suffix, exp);
}

function f_ctrl_get_exp_trx(IPA_CTRL_PT pt, integer bts_nr, integer trx_nr, CtrlVariable suffix,
			    template CtrlValue exp)
{
	f_ctrl_get_exp(pt, valueof(ts_bts_trx(bts_nr, trx_nr)) & suffix, exp);
}



type record BTS_State {
	IPA_Client rsl
}

type component test_CT extends BSSAP_Adapter_CT {
	var BTS_State bts[NUM_BTS];
	port IPA_RSL_PT IPA_RSL[NUM_BTS];

	var IPA_Client ctrl;
	port IPA_CTRL_PT IPA_CTRL;

	var boolean g_initialized := false;
	timer T_guard := 30.0;

}

modulepar {
	charstring mp_bsc_ip := "127.0.0.1";
	integer mp_bsc_rsl_port := 3003;
	integer mp_bsc_ctrl_port := 4249;
}

type record IPA_Client {
	IPA_Emulation_CT vc_IPA,
	IPA_CCM_Parameters ccm_pars,
	charstring id
}

function f_ipa_rsl_start(inout IPA_Client clnt, charstring bsc_host, PortNumber bsc_port, integer i)
runs on test_CT {
	timer T := 10.0;

	clnt.id := "IPA" & int2str(i) & "-RSL";
	clnt.vc_IPA := IPA_Emulation_CT.create(clnt.id & "-IPA");
	clnt.ccm_pars := c_IPA_default_ccm_pars;
	clnt.ccm_pars.name := "Osmocom TTCN-3 BTS Simulator";
	clnt.ccm_pars.unit_id := int2str(1234+i) & "/0/0";

	map(clnt.vc_IPA:IPA_PORT, system:IPA_CODEC_PT);
	connect(clnt.vc_IPA:IPA_RSL_PORT, self:IPA_RSL[i]);

	clnt.vc_IPA.start(IPA_Emulation.main_client(bsc_host, bsc_port, "", 10000+i, clnt.ccm_pars));

	/* wait for IPA RSL link to connect and send ID ACK */
	T.start;
	alt {
	[] IPA_RSL[i].receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_ID_ACK}) {
		T.stop;
		IPA_RSL[i].send(ts_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,ts_RSL_PAGING_LOAD_IND(23)));
		}
	[] IPA_RSL[i].receive(ASP_IPA_Event:?) { repeat }
	[] IPA_RSL[i].receive { repeat }
	[] T.timeout {
		setverdict(fail, "Timeout RSL waiting for ASP_IPA_EVENT_ID_ACK");
		self.stop;
		}
	}
}

function f_ipa_ctrl_start(inout IPA_Client clnt, charstring bsc_host, PortNumber bsc_port, integer i)
runs on test_CT {
	timer T := 10.0;

	clnt.id := "IPA" & int2str(i) & "-CTRL";
	clnt.vc_IPA := IPA_Emulation_CT.create(clnt.id & "-IPA");

	map(clnt.vc_IPA:IPA_PORT, system:IPA_CODEC_PT);
	connect(clnt.vc_IPA:IPA_CTRL_PORT, self:IPA_CTRL);

	clnt.vc_IPA.start(IPA_Emulation.main_client(bsc_host, bsc_port, "", -1));

	/* wait for IPA CTRL link to connect and send UP */
	T.start;
	alt {
	[] IPA_CTRL.receive(ASP_IPA_Event:{up_down := ASP_IPA_EVENT_UP}) { }
	[] T.timeout {
		setverdict(fail, "Timeout CTRL waiting for ASP_IPA_EVENT_UP");
		self.stop;
		}
	}
}


function f_wait_oml(integer bts_nr, charstring status, float secs_max) runs on test_CT {
	timer T := secs_max;
	T.start;
	while (true) {
		if (f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-connection-state") == status) {
			T.stop;
			/* the 'degraded' state exists from OML connection time, and we have to wait
			 * until all MO's are initialized */
			T.start(1.0);
			T.timeout;
			return;
		}
		f_sleep(0.5);
		if (not T.running) {
			setverdict(fail, "Timeout waiting for oml-connection-state ", status);
			self.stop;
		}
	}
}

function f_sleep(float seconds) {
	timer T := seconds;
	T.start;
	T.timeout;
}

altstep as_Tguard() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	[] T_guard.timeout { setverdict(fail, "Timeout of T_guard"); }
	/* always respond with RESET ACK to RESET */
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(?, ?, tr_BSSMAP_Reset)) -> value ud_ind {
		BSSAP.send(ts_BSSAP_UNITDATA_req(ud_ind.callingAddress, ud_ind.calledAddress,
			   ts_BSSMAP_ResetAck));
		repeat;
		}
}

function f_init() runs on test_CT {
	var integer i;

	if (g_initialized) {
		return;
	}
	g_initialized := true;

	/* Call a function of our 'parent component' BSSAP_Adapter_CT to start the
	 * MSC-side BSSAP emulation */
	f_bssap_init("VirtMSC");
	f_ipa_ctrl_start(ctrl, mp_bsc_ip, mp_bsc_ctrl_port, 0);

	for (i := 0; i < NUM_BTS; i := i+1) {
		/* wait until osmo-bts-omldummy has respawned */
		f_wait_oml(i, "degraded", 5.0);
		/* start RSL connection */
		f_ipa_rsl_start(bts[i].rsl, mp_bsc_ip, mp_bsc_rsl_port, i);
		/* wait until BSC tells us "connected" */
		f_wait_oml(i, "connected", 5.0);
	}
	f_sleep(0.5);

	T_guard.start;
	activate(as_Tguard());
}

function f_exp_ipa_rx(integer bts_nr, template RSL_Message t_rx, float t_secs := 2.0, IpaStreamId sid := IPAC_PROTO_RSL_TRX0)
runs on test_CT return RSL_Message {
	var ASP_RSL_Unitdata rx_rsl_ud;
	timer T := t_secs;

	T.start;
	alt {
	[] IPA_RSL[bts_nr].receive(tr_ASP_RSL_UD(sid, t_rx)) -> value rx_rsl_ud {
		T.stop;
		}
	[] IPA_RSL[bts_nr].receive { repeat; }
	[] T.timeout {
		setverdict(fail, "Timeout expecting ", t_rx);
		self.stop;
		}
	}
	return rx_rsl_ud.rsl;
}

function f_ipa_tx(integer bts_nr, template RSL_Message t_tx, IpaStreamId sid := IPAC_PROTO_RSL_TRX0)
runs on test_CT {
	IPA_RSL[bts_nr].send(ts_ASP_RSL_UD(sid, t_tx));
}


/* verify we get a CHAN_ACT after CHAN RQD */
testcase TC_chan_act_noreply() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;

	f_init();
	f_bssap_reset();

	IPA_RSL[0].send(ts_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,ts_RSL_CHAN_RQD('23'O, 23)));
	f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	setverdict(pass);
}

/* verify if the "chreq:total" counter increments as expected */
testcase TC_chan_act_counter() runs on test_CT {
	var BSSAP_N_UNITDATA_ind ud_ind;
	var integer chreq_total;

	f_init();
	f_bssap_reset();

	chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
	IPA_RSL[0].send(ts_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,ts_RSL_CHAN_RQD('23'O, 23)));
	f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total", chreq_total+1);

	setverdict(pass);
}

/* CHAN RQD -> CHAN ACT -> CHAN ACT ACK -> RF CHAN REL */
testcase TC_chan_act_ack_noest() runs on test_CT {
	var RSL_Message rx_rsl;

	f_init();
	f_bssap_reset();

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack();

	/* expect BSC to disable the channel again if there's no RLL EST IND */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);

	setverdict(pass);
}

/* Test behavior if MSC never answers to CR */
testcase TC_chan_act_ack_est_ind_noreply() runs on test_CT {
	var RSL_Message rx_rsl;

	f_init();
	f_bssap_reset();

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3)));

	/* expect BSC to disable the channel again if there's no response from MSC */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);

	setverdict(pass);
}

/* Test behavior if MSC answers with CREF to CR */
testcase TC_chan_act_ack_est_ind_refused() runs on test_CT {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var RSL_Message rx_rsl;

	f_init();
	f_bssap_reset();

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) -> value rx_c_ind;
	BSSAP.send(ts_BSSAP_DISC_req(rx_c_ind.connectionId, 0));

	/* expect BSC to disable the channel */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);

	setverdict(pass);
}

/* CHAN RQD -> CHAN ACT -> CHAN ACT NACK -> RF CHAN REL */
testcase TC_chan_act_nack() runs on test_CT {
	var RSL_Message rx_rsl;
	var integer chact_nack;

	f_init();
	f_bssap_reset();

	chact_nack := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chan_act:nack");

	f_ipa_tx(0, ts_RSL_CHAN_RQD('33'O, 33));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	var RslChannelNr chan_nr := rx_rsl.ies[0].body.chan_nr;

	f_ipa_tx(0, ts_RSL_CHAN_ACT_NACK(chan_nr, RSL_ERR_EQUIPMENT_FAIL));

	/* wait for some time to hope the NACK arrives before the CTRL GET below */
	f_sleep(0.5);

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chan_act:nack", chact_nack+1);

	setverdict(pass);
}

/* Test for channel exhaustion due to RACH overload */
testcase TC_chan_exhaustion() runs on test_CT {
	var ASP_RSL_Unitdata rsl_ud;
	var integer i;
	var integer chreq_total, chreq_nochan;

	f_init();
	f_bssap_reset();

	chreq_total := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total");
	chreq_nochan := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel");

	/* expect 5xTCH/F to succeed */
	for (i := 0; i < NUM_TCHF_PER_BTS; i := i+1) {
		f_chreq_act_ack('23'O, i);
	}

	IPA_RSL[0].clear;

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total", chreq_total+NUM_TCHF_PER_BTS);

	/* now expect additional channel activations to fail */
	f_ipa_tx(0, ts_RSL_CHAN_RQD('42'O, 42));

	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
				tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV))) {
		setverdict(fail, "Received CHAN ACT ACK without resources?!?");
		}
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_IMM_ASSIGN(?))) -> value rsl_ud {
		var GsmRrMessage rr;
		/* match on IMM ASS REJ */
		rr := dec_GsmRrMessage(rsl_ud.rsl.ies[1].body.full_imm_ass_info.payload);
		if (rr.header.message_type == IMMEDIATE_ASSIGNMENT_REJECT) {
			f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:total",
						   chreq_total+NUM_TCHF_PER_BTS+1);
			f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "chreq:no_channel",
						   chreq_nochan+1);
			setverdict(pass);
		} else {
			repeat;
		}
		}
	[] IPA_RSL[0].receive { repeat; }
	}
}

/* Test behavior if MSC answers with CREF to CR */
testcase TC_assignment_cic_only() runs on test_CT {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00000000'O);
	/* send assignment without AoIP IEs */
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_AssignmentReq(ts_BSSMAP_IE_CIC(0, 1))));
	alt {
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentComplete)) {
		setverdict(fail, "AoIP BSC cannot accept ASSIGNMENT without AoIP Transport IE");
		}
	[] BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_AssignmentFail)) {
		setverdict(pass);
		}
	[] BSSAP.receive { repeat; }
	}
}


type record DchanTuple {
	integer sccp_conn_id,
	RslChannelNr rsl_chan_nr
}

/* Send CHAN RQD and wait for allocation; acknowledge it */
private function f_chreq_act_ack(OCT1 ra := '23'O, GsmFrameNumber fn := 23)
runs on test_CT return RslChannelNr {
	var RSL_Message rx_rsl;
	f_ipa_tx(0, ts_RSL_CHAN_RQD(ra, fn));
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV));
	var RslChannelNr chan_nr := rx_rsl.ies[0].body.chan_nr;
	f_ipa_tx(0, ts_RSL_CHAN_ACT_ACK(chan_nr, fn+10));
	return chan_nr;
}

/* helper function to establish a dedicated channel via BTS and MSC */
function f_est_dchan(OCT1 ra, GsmFrameNumber fn, octetstring l3)
runs on test_CT return DchanTuple {
	var BSSAP_N_CONNECT_ind rx_c_ind;
	var DchanTuple dt;

	/* Send CHAN RQD and wait for allocation; acknowledge it */
	dt.rsl_chan_nr := f_chreq_act_ack(ra, fn);

	f_ipa_tx(0, ts_RSL_EST_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) -> value rx_c_ind;
	dt.sccp_conn_id := rx_c_ind.connectionId;
	BSSAP.send(ts_BSSAP_CONNECT_res(dt.sccp_conn_id));

	return dt;
}

/* Test behavior of channel release after unilateral RLL REL IND (DISC from MS) */
testcase TC_chan_rel_rll_rel_ind() runs on test_CT {
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* simulate RLL REL IND */
	f_ipa_tx(0, ts_RSL_REL_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0))));

	/* expect BSC to disable the channel */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);
	/* respond with CHAN REL ACK */
	f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));

	/* expect DISC_IND on MSC side */
	BSSAP.receive(tr_BSSAP_DISC_ind(dt.sccp_conn_id, ?, ?));

	setverdict(pass);
}

/* Test behavior of channel release after CONN FAIL IND from BTS */
testcase TC_chan_rel_conn_fail() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var RSL_Message rx_rsl;
	var DchanTuple dt;

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* simulate CONN FAIL IND */
	f_ipa_tx(0, ts_RSL_CONN_FAIL_IND(dt.rsl_chan_nr, RSL_ERR_RADIO_LINK_FAIL));
	/* TODO: different cause values? */

	/* expect BSC to disable the channel */
	rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);
	/* respond with CHAN REL ACK */
	f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));

	/* expect Clear Request from BSC */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearRequest)) -> value rx_di;

	/* Instruct BSC to clear channel */
	var BssmapCause cause := bit2int(rx_di.userData.pdu.bssmap.clearRequest.cause.causeValue);
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

	/* expect Clear Complete from BSC */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete));

	/* release the SCCP connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));

	/* wait for SCCP emulation to do its job */
	f_sleep(1.0);

	setverdict(pass);
}

/* Test behavior of channel release after hard Clear Command from MSC */
testcase TC_chan_rel_hard_clear() runs on test_CT {
	var BSSAP_N_DATA_ind rx_di;
	var DchanTuple dt;
	var RslLinkId main_dcch := valueof(ts_RslLinkID_DCCH(0));

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* Instruct BSC to clear channel */
	var BssmapCause cause := 0;
	BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));

	/* expect Clear Complete from BSC on A */
	BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete)) {
		/* release the SCCP connection */
		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
	}

	/* Clear the queue, it might still contain stuff like IMMEDIATE ASSIGN */
	IPA_RSL[0].clear;
	alt {
	/* ignore DEACTIVATE SACCH (if any) */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_DEACT_SACCH(dt.rsl_chan_nr))) {
		repeat;
	}
	/* acknowledge RLL release (if any)*/
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_REL_REQ(dt.rsl_chan_nr, ?))) {
		/* FIXME: Why are we getting this for LinkID SACCH? */
		f_ipa_tx(0, ts_RSL_REL_CONF(dt.rsl_chan_nr, main_dcch));
		repeat;
	}
	/* Expect RF channel release from BSC on Abis */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
						tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL))) {
		/* respond with CHAN REL ACK */
		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));
		}
	}

	setverdict(pass);
}

/* Test behavior of channel release after hard RLSD from MSC */
testcase TC_chan_rel_hard_rlsd() runs on test_CT {
	var DchanTuple dt;
	var RslLinkId main_dcch := valueof(ts_RslLinkID_DCCH(0));

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* release the SCCP connection */
	BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));

	/* Clear the queue, it might still contain stuff like IMMEDIATE ASSIGN */
	IPA_RSL[0].clear;
	alt {
	/* ignore DEACTIVATE SACCH (if any) */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_DEACT_SACCH(dt.rsl_chan_nr))) {
		repeat;
	}
	/* acknowledge RLL release (if any)*/
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_REL_REQ(dt.rsl_chan_nr, ?))) {
		/* FIXME: Why are we getting this for LinkID SACCH? */
		f_ipa_tx(0, ts_RSL_REL_CONF(dt.rsl_chan_nr, main_dcch));
		repeat;
	}
	/* Expect RF channel release from BSC on Abis */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
						tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL))) {
		/* respond with CHAN REL ACK */
		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));
		}
	}

	setverdict(pass);
}

/* Test behavior of channel release after BSSMAP RESET from MSC */
testcase TC_chan_rel_a_reset() runs on test_CT {
	var DchanTuple dt;
	var RslLinkId main_dcch := valueof(ts_RslLinkID_DCCH(0));

	f_init();
	f_bssap_reset();

	dt := f_est_dchan('23'O, 23, '00010203040506'O);

	/* Clear the queue, it might still contain stuff like IMMEDIATE ASSIGN */
	IPA_RSL[0].clear;

	/* perform BSSAP RESET, expect RESET ACK and DISC.ind on connection */
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_sccp_addr_peer, g_sccp_addr_own, ts_BSSMAP_Reset(0)));
	interleave {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(g_sccp_addr_own, g_sccp_addr_peer, tr_BSSMAP_ResetAck)) { }
	[] BSSAP.receive(tr_BSSAP_DISC_ind(dt.sccp_conn_id, ?, ?)) { }
	}

	alt {
	/* ignore DEACTIVATE SACCH (if any) */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_DEACT_SACCH(dt.rsl_chan_nr))) {
		repeat;
	}
	/* acknowledge RLL release (if any)*/
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
					tr_RSL_REL_REQ(dt.rsl_chan_nr, ?))) {
		/* FIXME: Why are we getting this for LinkID SACCH? */
		f_ipa_tx(0, ts_RSL_REL_CONF(dt.rsl_chan_nr, main_dcch));
		repeat;
	}
	/* Expect RF channel release from BSC on Abis */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0,
						tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL))) {
		/* respond with CHAN REL ACK */
		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));
		}
	/* ignore any user data */
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_MsgTypeR(?))) {
		repeat;
		}
	}

	setverdict(pass);
}

/* Test behavior if RSL EST IND for non-active channel */
testcase TC_rll_est_ind_inact_lchan() runs on test_CT {
	timer T := 2.0;

	f_init();
	f_bssap_reset();

	var octetstring l3 := '00010203040506'O;
	var RslChannelNr chan_nr := valueof(t_RslChanNr_Bm(6));
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(0)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for non-active lchan");
		}
	[] BSSAP.receive {}
	[] IPA_RSL[0].receive {}
	[] T.timeout {}
	}

	setverdict(pass);
}

/* Test behavior if RSL EST IND for invalid SAPI */
testcase TC_rll_est_ind_inval_sapi1() runs on test_CT {
	var RslChannelNr chan_nr;

	f_init();
	f_bssap_reset();

	chan_nr := f_chreq_act_ack()

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(1)), l3));

	timer T := 2.0;
	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid SAPI 1");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	setverdict(pass);
}

/* Test behavior if RSL EST IND for invalid SAPI */
testcase TC_rll_est_ind_inval_sapi3() runs on test_CT {
	timer T := 2.0;

	f_init();
	f_bssap_reset();

	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_DCCH(3)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid SAPI 3");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	setverdict(pass);
}

/* Test behavior if RSL EST IND for invalid SACCH */
testcase TC_rll_est_ind_inval_sacch() runs on test_CT {
	timer T := 2.0;

	f_init();
	f_bssap_reset();

	var RslChannelNr chan_nr := f_chreq_act_ack();

	var octetstring l3 := '00010203040506'O;
	f_ipa_tx(0, ts_RSL_EST_IND(chan_nr, valueof(ts_RslLinkID_SACCH(0)), l3));

	T.start;
	alt {
	[] BSSAP.receive(tr_BSSAP_CONNECT_ind(?, ?, tr_BSSMAP_ComplL3(l3))) {
		setverdict(fail, "MSC received COMPL L3 for invalid Link SACCH");
		}
	[] BSSAP.receive { repeat; }
	[] IPA_RSL[0].receive { repeat; }
	[] T.timeout {}
	}

	setverdict(pass);
}




testcase TC_ctrl_msc_connection_status() runs on test_CT {
	var charstring ctrl_resp;

	f_init();
	f_bssap_reset();

	/* See https://osmocom.org/issues/2729 */
	f_ctrl_get_exp(IPA_CTRL, "msc_connection_status", "connected");
	setverdict(pass);
}

testcase TC_ctrl() runs on test_CT {
	var charstring ctrl_resp;

	f_init();
	f_bssap_reset();

	/* all below values must match the osmo-bsc.cfg config file used */

	f_ctrl_get_exp(IPA_CTRL, "mcc", "1");
	f_ctrl_get_exp(IPA_CTRL, "mnc", "1");
	f_ctrl_get_exp(IPA_CTRL, "short-name", "OsmoBSC");
	f_ctrl_get_exp(IPA_CTRL, "long-name", "OsmoBSC");
	f_ctrl_get_exp(IPA_CTRL, "number-of-bts", "1");

	var integer bts_nr := 0;
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "location-area-code", "1");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "cell-identity", "0");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "oml-connection-state", "connected");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "gprs-mode", "gprs");
	f_ctrl_get_exp_bts(IPA_CTRL, bts_nr, "rf_state", "operational,unlocked,on");
	f_ctrl_get_exp_trx(IPA_CTRL, bts_nr, 0, "arfcn", "871");
	f_ctrl_get_exp_trx(IPA_CTRL, bts_nr, 0, "max-power-reduction", "20");

	var integer uptime := str2int(f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-uptime"));
	f_sleep(2.0);
	if (str2int(f_ctrl_get_bts(IPA_CTRL, bts_nr, "oml-uptime")) < uptime+1) {
		setverdict(fail, "oml-uptime not incrementing as expected");
	}
	/* TODO: Disconnect RSL, imply that OML is disconnected and check for uptime zero? */

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted", 0);

	setverdict(pass);
}

function f_bssap_tx_ud(template PDU_BSSAP bssap) runs on test_CT {
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_sccp_addr_peer, g_sccp_addr_own, bssap));
}


/***********************************************************************
 * Paging Testing
 ***********************************************************************/

type record Cell_Identity {
	GsmMcc		mcc,
	GsmMnc		mnc,
	GsmLac		lac,
	GsmCellId	ci
};
private const Cell_Identity cid := { '001'H, '001'H, 1, 0 };

type set of integer BtsIdList;

private function f_bts_in_list(integer bts_id, BtsIdList bts_ids) return boolean {
	for (var integer j := 0; j < sizeof(bts_ids); j := j + 1) {
		if (bts_id == bts_ids[j]) {
			return true;
		}
	}
	return false;
}

/* core paging test helper function; used by most paging test cases */
private function f_pageing_helper(hexstring imsi,
				  template BSSMAP_FIELD_CellIdentificationList cid_list,
				  BtsIdList bts_ids := { 0 },
				  template RSL_ChanNeeded rsl_chneed := omit,
				  template OCT4 tmsi := omit) runs on test_CT
{
	var template BSSMAP_IE_ChannelNeeded bssmap_chneed;
	var MobileIdentity mi;
	var template octetstring id_enc; /* FIXME */
	var RSL_Message rx_rsl;
	var integer paging_group := hex2int(imsi[lengthof(imsi)-1]);
	var integer i;

	f_init();
	f_bssap_reset();

	/* Clear the queue, it might still contain stuff like BCCH FILLING */
	for (i := 0; i < sizeof(bts_ids); i := i + 1) {
		IPA_RSL[bts_ids[i]].clear;
	}

	if (isvalue(rsl_chneed)) {
		/* The values of 08.08 3.2.2.36 and 08.58 9.3.40 are luckily identical */
		bssmap_chneed := ts_BSSMAP_IE_ChanNeeded(int2bit(enum2int(valueof(rsl_chneed)),2));
	} else {
		bssmap_chneed := omit;
	}

	f_bssap_tx_ud(ts_BSSMAP_Paging(imsi, cid_list, tmsi, bssmap_chneed));

/* FIXME: Disabled due to bugs in both GSM_RR_Types and MobileL3_CommonIE_Types IMSI encoder 
	if (isvalue(tmsi)) {
		mi := valueof(t_Osmo_MI_TMSI(oct2int(valueof(tmsi))));
	} else {
		mi := valueof(ts_Osmo_MI_IMSI(imsi));
	}
	id_enc := enc_MobileIdentity(mi);
*/
	id_enc := ?;
	for (i := 0; i < sizeof(bts_ids); i := i + 1) {
		rx_rsl := f_exp_ipa_rx(bts_ids[i], tr_RSL_PAGING_CMD(id_enc));
		/* check channel type, paging group */
		if (rx_rsl.ies[1].body.paging_group != paging_group) {
			setverdict(fail, "Paging for wrong paging group");
		}
		if (ispresent(rsl_chneed) and
		    rx_rsl.ies[3].body.chan_needed.chan_needed != valueof(rsl_chneed)) {
			setverdict(fail, "RSL Channel Needed != BSSMAP Channel Needed");
		}
	}
	/* do a quick check on all not-included BTSs if they received paging */
	for (i := 0; i < NUM_BTS; i := i + 1) {
		timer T := 0.1;
		if (f_bts_in_list(i, bts_ids)) {
			continue;
		}
		T.start;
		alt {
		[] IPA_RSL[i].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(id_enc))) {
			setverdict(fail, "Paging on BTS ", i, " which is not part of ", bts_ids);
			}
		[] IPA_RSL[i].receive { repeat; }
		[] T.timeout { }
		}
	}

	setverdict(pass);
}

const BtsIdList c_BtsId_all := { 0, 1, 2 };
const BtsIdList c_BtsId_LAC1 := { 0, 1 };
const BtsIdList c_BtsId_LAC2 := { 2 };

/* PAGING by IMSI + TMSI */
testcase TC_paging_imsi_nochan() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010123456789'H, cid_list, c_BtsId_all);
}

/* PAGING by IMSI + TMSI */
testcase TC_paging_tmsi_nochan() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000001'H, cid_list, c_BtsId_all, omit, 'A1B2C301'O);
}

/* Paging with different "channel needed' values */
testcase TC_paging_tmsi_any() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000002'H, cid_list, c_BtsId_all, RSL_CHANNEED_ANY, 'A1B2C302'O);
}
testcase TC_paging_tmsi_sdcch() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010100000003'H, cid_list, c_BtsId_all, RSL_CHANNEED_SDCCH, 'A1B2C303'O);
}
testcase TC_paging_tmsi_tch_f() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010000000004'H, cid_list, c_BtsId_all, RSL_CHANNEED_TCH_F, 'A1B2C304'O);
}
testcase TC_paging_tmsi_tch_hf() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010000000005'H, cid_list, c_BtsId_all, RSL_CHANNEED_TCH_ForH, 'A1B2C305'O);
}

/* Paging by CGI */
testcase TC_paging_imsi_nochan_cgi() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_CGI := { ts_BSSMAP_CI_CGI(cid.mcc, cid.mnc, cid.lac, cid.ci) } };
	f_pageing_helper('001010000000006'H, cid_list, { 0 });
}

/* Paging by LAC+CI */
testcase TC_paging_imsi_nochan_lac_ci() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC_CI := { ts_BSSMAP_CI_LAC_CI(cid.lac, cid.ci) } };
	f_pageing_helper('001010000000007'H, cid_list, { 0 });
}

/* Paging by CI */
testcase TC_paging_imsi_nochan_ci() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_CI := { ts_BSSMAP_CI_CI(cid.ci) } };
	f_pageing_helper('001010000000008'H, cid_list, { 0 });
}

/* Paging by LAI */
testcase TC_paging_imsi_nochan_lai() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAI := { ts_BSSMAP_CI_LAI(cid.mcc, cid.mnc, cid.lac) } };
	f_pageing_helper('001010000000009'H, cid_list, c_BtsId_LAC1);
}

/* Paging by LAC */
testcase TC_paging_imsi_nochan_lac() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_LAC := { ts_BSSMAP_CI_LAC(cid.lac) } };
	f_pageing_helper('001010000000010'H, cid_list, c_BtsId_LAC1);
}

/* Paging by "all in BSS" */
testcase TC_paging_imsi_nochan_all() runs on test_CT {
	var template BSSMAP_FIELD_CellIdentificationList cid_list;
	cid_list := { cIl_allInBSS := ''O };
	f_pageing_helper('001010000000011'H, cid_list, c_BtsId_all);
}

/* Paging by PLMN+LAC+RNC */
/* Paging by RNC */
/* Paging by LAC+RNC */

/* Paging on multiple cells (multiple in one LAC): Verify all of them page */
/* Paging on multiple cells (multiple entries in list): Verify all of them page */
/* Verify paging retransmission interval + count */
/* Verify paging stops after channel establishment */
/* Test behavior under paging overload */

/* Verify PCH load */
testcase TC_paging_imsi_load() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 4.0;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010123456789'H, cid_list, c_BtsId_all);

	/* tell BSC there is no paging space anymore */
	f_ipa_tx(0, ts_RSL_PAGING_LOAD_IND(0));

	/* Wait for 4 seconds if any more PAGING CMD are received on RSL. Normally,
	 * there would be 8 retransmissions during 4 seconds */
	T.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after LOAD_IND(0)");
		self.stop;
		}
	[] T.timeout {
		setverdict(pass);
		}
	}
}

/* Verify PCH load */
testcase TC_paging_counter() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 4.0;
	var integer i;
	var integer paging_attempted_bsc;
	var integer paging_attempted_bts[NUM_BTS];
	var integer paging_expired_bts[NUM_BTS];
	cid_list := valueof(ts_BSSMAP_CIL_noCell);

	f_init();

	/* read counters before paging */
	paging_attempted_bsc := f_ctrl_get_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted");
	for (i := 0; i < NUM_BTS; i := i+1) {
		paging_attempted_bts[i] := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", i, "paging:attempted");
		paging_expired_bts[i] := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", i, "paging:expired");
	}

	f_pageing_helper('001230000000001'H, cid_list, c_BtsId_all);

	/* expect the attempted pages on BSC and each BTSs to have incremented by one */
	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bsc", 0, "paging:attempted", paging_attempted_bsc+1);
	for (i := 0; i < NUM_BTS; i := i+1) {
		f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", i, "paging:attempted",
						paging_attempted_bts[i]+1);
	}

	/* assume that 12s later the paging on all BTSs have expired and hence incremented by 1 */
	f_sleep(12.0);
	for (i := 0; i < NUM_BTS; i := i+1) {
		f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", i, "paging:expired",
						paging_expired_bts[i]+1);
	}
	setverdict(pass);

}


/* Verify paging stops after A-RESET */
testcase TC_paging_imsi_a_reset() runs on test_CT {
	var BSSMAP_FIELD_CellIdentificationList cid_list;
	timer T := 3.0;
	cid_list := valueof(ts_BSSMAP_CIL_noCell);
	f_pageing_helper('001010123456789'H, cid_list, c_BtsId_all);

	/* Perform a BSSMAP Reset and wait for ACK */
	BSSAP.send(ts_BSSAP_UNITDATA_req(g_sccp_addr_peer, g_sccp_addr_own, ts_BSSMAP_Reset(0)));
	alt {
	[] BSSAP.receive(tr_BSSAP_UNITDATA_ind(g_sccp_addr_own, g_sccp_addr_peer, tr_BSSMAP_ResetAck)) { }
	[] BSSAP.receive { repeat; }
	}

	/* Clear the queue, it might still contain stuff like BCCH FILLING */
	IPA_RSL[0].clear;

	/* Wait for 3 seconds if any more PAGING CMD are received on RSL */
	T.start;
	alt {
	[] IPA_RSL[0].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		self.stop;
		}
	[] IPA_RSL[1].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		self.stop;
		}
	[] IPA_RSL[2].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(?))) {
		setverdict(fail, "Received PAGING after A-RESET");
		self.stop;
		}
	[] T.timeout {
		setverdict(pass);
		}
	}
}

/* Test RSL link drop causes counter increment */
testcase TC_rsl_drop_counter() runs on test_CT {
	var integer rsl_fail;

	f_init();
	f_bssap_reset();

	rsl_fail := f_ctrl_get_ratectr_abs(IPA_CTRL, "bts", 0, "rsl_fail");

	bts[0].rsl.vc_IPA.stop;

	f_ctrl_get_exp_ratectr_abs(IPA_CTRL, "bts", 0, "rsl_fail", rsl_fail+1);

	setverdict(pass);
}

/* TODO: Test OML link drop causes counter increment */

control {
	execute( TC_ctrl_msc_connection_status() );
	execute( TC_ctrl() );
	execute( TC_chan_act_noreply() );
	execute( TC_chan_act_counter() );
	execute( TC_chan_act_ack_noest() );
	execute( TC_chan_act_ack_est_ind_noreply() );
	execute( TC_chan_act_ack_est_ind_refused() );
	execute( TC_chan_act_nack() );
	execute( TC_chan_exhaustion() );
	execute( TC_chan_rel_rll_rel_ind() );
	execute( TC_chan_rel_conn_fail() );
	execute( TC_chan_rel_hard_clear() );
	execute( TC_chan_rel_hard_rlsd() );
	execute( TC_chan_rel_a_reset() );

	execute( TC_assignment_cic_only() );

	execute( TC_rll_est_ind_inact_lchan() );
	execute( TC_rll_est_ind_inval_sapi1() );
	execute( TC_rll_est_ind_inval_sapi3() );
	execute( TC_rll_est_ind_inval_sacch() );

	execute( TC_paging_imsi_nochan() );
	execute( TC_paging_tmsi_nochan() );
	execute( TC_paging_tmsi_any() );
	execute( TC_paging_tmsi_sdcch() );
	execute( TC_paging_tmsi_tch_f() );
	execute( TC_paging_tmsi_tch_hf() );
	execute( TC_paging_imsi_nochan_cgi() );
	execute( TC_paging_imsi_nochan_lac_ci() );
	execute( TC_paging_imsi_nochan_ci() );
	execute( TC_paging_imsi_nochan_lai() );
	execute( TC_paging_imsi_nochan_lac() );
	execute( TC_paging_imsi_nochan_all() );
	execute( TC_paging_imsi_a_reset() );
	execute( TC_paging_imsi_load() );

	execute( TC_rsl_drop_counter() );
}

}