bsc: add TC_cm_reestablishment
Related: SYS#5130
Change-Id: I1e7d446644f46b8a0a94688e618ffb4f23a8900e
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index c4ae469..0ab8bde 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -9434,6 +9434,141 @@
f_shutdown_helper();
}
+const charstring REEST_LOST_CONNECTION := "REEST_LOST_CONNECTION";
+const charstring REEST_CLEAR := "REEST_CLEAR";
+const charstring REEST_CLEAR_DONE := "REEST_CLEAR_DONE";
+
+/* CM Re-Establishment, 3GPP TS 24.008 4.5.1.6.
+ * The MS <-> BTS loses radio connection, MS shows up on second BTS and asks for CM Re-Establishment.
+ * BSC should establish a separate A conn for the same MS, the original A conn is then cleared by
+ * the MSC as the CM Re-Establishment is handled.
+ *
+ * MS bts0 bts1 bsc msc test-component
+ * |<----->|<----------------->|<-0-->| _1 Establish channel on bts 0
+ * | | _1 wait a bit, to settle down
+ * |<-x x--| | _1 "lose connection"
+ * | | REEST_LOST_CONNECTION
+ * |----------------->|------->|--1-->| _2 new A-conn: Chan Rqd, Imm Ass, Compl L3 with CM Re-Establishment Req
+ * | | REEST_CLEAR
+ * | |<-0---| _1 Clear Command on first A-conn
+ * | |--0-->| _1 Clear Complete
+ * | |<----------------->| | _1 Release first channel
+ * | | REEST_CLEAR_DONE
+ * |<-----------------|<-------|<-1---| _2 Chan Activ, Assignment Command
+ * |<-----------------|<-------|<-1---| _2 Clear Command, Release
+ *
+ */
+private function f_tc_cm_reestablishment_1(charstring id) runs on MSC_ConnHdlr {
+ var template PDU_BSSAP exp_compl := f_gen_exp_compl();
+ var PDU_BSSAP ass_cmd := f_gen_ass_req();
+
+ ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
+ ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
+
+ f_establish_fully(ass_cmd, exp_compl);
+
+ /* The original channel loses connection, MS attemts CM Re-Establishment on another cell, see
+ * f_tc_cm_reestablishment_2(). This established channel stays active until MSC sends a Clear Command. The time
+ * when exactly that happens is determined by f_tc_cm_reestablishment_2(). */
+ f_sleep(2.0);
+ COORD.send(REEST_LOST_CONNECTION);
+
+ alt {
+ [] COORD.receive(REEST_CLEAR);
+ [] RSL.receive(tr_RSL_DEACT_SACCH(g_chan_nr)) {
+ setverdict(fail, "Unexpected channel release");
+ mtc.stop;
+ }
+ [] RSL.receive(tr_RSL_RF_CHAN_REL(g_chan_nr)) {
+ setverdict(fail, "Unexpected channel release");
+ mtc.stop;
+ }
+ }
+ f_perform_clear()
+ f_expect_dlcx_conns();
+ COORD.send(REEST_CLEAR_DONE);
+}
+
+private function f_tc_cm_reestablishment_2(charstring id) runs on MSC_ConnHdlr {
+ f_MscConnHdlr_init(g_pars.media_nr, host_bts, host_mgw_mgcp, FR_AMR);
+
+ /* The MS lost the connection on the first channel, now establishes another one */
+ COORD.receive(REEST_LOST_CONNECTION);
+
+ var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(g_pars.imsi));
+ var PDU_ML3_MS_NW l3_info := valueof(ts_CM_REESTABL_REQ(mi));
+ var octetstring l3_enc := enc_PDU_ML3_MS_NW(l3_info);
+
+ f_create_bssmap_exp(l3_enc);
+ RSL_Emulation.f_chan_est(g_pars.ra, l3_enc, g_pars.link_id, g_pars.fn);
+ BSSAP.receive(tr_BSSMAP_ComplL3(l3_enc));
+
+ /* MSC got the CM Re-Establishment request and first off clears the previous conn. */
+ COORD.send(REEST_CLEAR);
+ COORD.receive(REEST_CLEAR_DONE);
+
+ f_sleep(2.0);
+
+ /* Answer the CM Re-Establishment with an Assignment Command. */
+ var template PDU_BSSAP expect_assignment_compl := f_gen_exp_compl();
+ var PDU_BSSAP ass_cmd := f_gen_ass_req();
+ ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelType);
+ ass_cmd.pdu.bssmap.assignmentRequest.codecList := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
+
+ var AssignmentState st := valueof(ts_AssignmentStateInit);
+ st.voice_call := true;
+ st.is_assignment := true;
+
+ var ExpectCriteria mgcpcrit := {
+ connid := omit,
+ endpoint := omit,
+ transid := omit
+ };
+ f_create_mgcp_expect(mgcpcrit);
+
+ f_rslem_dchan_queue_enable();
+
+ BSSAP.send(ass_cmd);
+
+ var PDU_BSSAP bssap;
+
+ alt {
+ [] as_assignment(st);
+ [] as_Media();
+ [st.assignment_done] BSSAP.receive(expect_assignment_compl) {
+ break;
+ }
+ }
+
+ f_sleep(3.0);
+
+ f_logp(BSCVTY, "f_tc_cm_reestablishment_2 clearing");
+ f_perform_clear();
+ f_expect_dlcx_conns();
+}
+
+testcase TC_cm_reestablishment() runs on test_CT {
+ var TestHdlrParams pars1 := f_gen_test_hdlr_pars();
+ var MSC_ConnHdlr vc_conn1;
+
+ var TestHdlrParams pars2 := f_gen_test_hdlr_pars();
+ var MSC_ConnHdlr vc_conn2;
+ pars2.imsi := pars1.imsi;
+ pars2.media_nr := 2;
+
+ f_init(2, true, guard_timeout := 40.0);
+ f_sleep(1.0);
+
+ vc_conn1 := f_start_handler_create(pars1);
+ vc_conn2 := f_start_handler_create(pars2);
+ connect(vc_conn1:COORD, vc_conn2:COORD);
+ f_start_handler_run(vc_conn1, refers(f_tc_cm_reestablishment_1), pars1);
+ f_start_handler_run(vc_conn2, refers(f_tc_cm_reestablishment_2), pars2);
+ vc_conn1.done;
+ vc_conn2.done;
+
+ f_shutdown_helper();
+}
control {
/* CTRL interface testing */
@@ -9722,6 +9857,8 @@
execute( TC_refuse_mode_modif_to_vamos() );
execute( TC_reassignment_fr() );
+
+ execute( TC_cm_reestablishment() );
}
}