cbc: Test sending Unknown TAI List to osmo-cbc

Related: OS#4945
Change-Id: I7d8cf5e6498d03ad340b8f843ce93a20171e9fca

3 files changed, 71 insertions, 3 deletions

diff --git a/cbc/CBC_Tests.ttcn b/cbc/CBC_Tests.ttcn
index 406baedf..9beaddfe 100644
--- a/cbc/CBC_Tests.ttcn
+++ b/cbc/CBC_Tests.ttcn
@@ -160,6 +160,7 @@ private function f_init_pars_mme(charstring mme_host, integer mme_sbcap_port,
 		start_fn := refers(f_MME_ConnHdlr_start_fn_void),
 		exp_cbs_msg := omit,
 		write_replace_warning_ind_cause := omit,
+		write_repl_unknown_TAIs := omit,
 		bcast_cell_id_list := omit
 	};
 	return pars;
@@ -498,6 +499,25 @@ testcase TC_ecbe_create_delete_mme_indication() runs on test_CT {
 	f_shutdown_helper();
 }
 
+/* Create and delete message with MME available. MME reports
+ * Write-Replace-Response with Unknown TAI IE.
+ */
+testcase TC_ecbe_create_delete_mme_unknown_tai() runs on test_CT {
+	var template (value) List_of_TAIs write_repl_unknown_TAIs;
+	var template (value) CBS_Message msg := t_CBSmsg(48, 16752);
+
+	f_init(num_bsc := 0, num_mme := 1);
+
+	write_repl_unknown_TAIs := {{ts_SBCAP_TAI(f_enc_mcc_mnc('901'H, '70'H), 1234)}};
+	g_pars_MME[0].start_fn := refers(f_mme_create_and_delete);
+	g_pars_MME[0].exp_cbs_msg := valueof(msg);
+	g_pars_MME[0].write_replace_warning_ind_cause := SBC_AP_Cause_message_accepted;
+	g_pars_MME[0].write_repl_unknown_TAIs := valueof(write_repl_unknown_TAIs);
+	f_start();
+	f_create_and_delete(valueof(msg));
+	f_shutdown_helper();
+}
+
 /* Create and delete message with both BSC and MME available */
 testcase TC_ecbe_create_delete_bsc_and_mme() runs on test_CT {
 	f_init(num_bsc := 1, num_mme := 1);
@@ -585,6 +605,7 @@ control {
 	execute( TC_ecbe_create_delete_ci() );
 	execute( TC_ecbe_create_delete_lai() );
 	execute( TC_ecbe_create_delete_mme_indication() );
+	execute( TC_ecbe_create_delete_mme_unknown_tai() );
 	execute( TC_ecbe_create_delete_bsc_and_mme() );
 	execute( TC_ecbe_create_delete_bsc_server() );
 	execute( TC_ecbe_create_delete_mme_server() );
diff --git a/cbc/MME_ConnectionHandler.ttcn b/cbc/MME_ConnectionHandler.ttcn
index ed0502e4..4bcc8533 100644
--- a/cbc/MME_ConnectionHandler.ttcn
+++ b/cbc/MME_ConnectionHandler.ttcn
@@ -45,6 +45,7 @@ type record MME_ConnHdlrPars {
 	void_fn start_fn,
 	CBS_Message exp_cbs_msg optional,
 	SBC_AP_Cause write_replace_warning_ind_cause optional,
+	List_of_TAIs write_repl_unknown_TAIs optional,
 	CellId_Broadcast_List bcast_cell_id_list optional
 };
 
@@ -64,9 +65,16 @@ function f_MME_ConnHdlr_main(charstring id, MME_ConnHdlrPars pars) runs on MME_C
 function f_sbcap_tx_write_replace_warn_resp(CBS_Message msg, integer idx := 0)
 runs on MME_ConnHdlr {
 	var template (value) SBC_AP_PDU tx;
-	/* TODO: pass Unknown Tracking Area List as parameter above (omit by default) */
-	tx := ts_SBCAP_WRITE_WARNING_RESP(int2bit(msg.msg_id, 16),
-					  int2bit(msg.ser_nr, 16));
+	if (ispresent(g_pars.write_repl_unknown_TAIs)) {
+		tx := ts_SBCAP_WRITE_WARNING_RESP_UNKNOWN_TAI(
+						int2bit(msg.msg_id, 16),
+						int2bit(msg.ser_nr, 16),
+						SBC_AP_Cause_message_accepted,
+						g_pars.write_repl_unknown_TAIs);
+	} else {
+		tx := ts_SBCAP_WRITE_WARNING_RESP(int2bit(msg.msg_id, 16),
+						  int2bit(msg.ser_nr, 16));
+	}
 	f_SBC_AP_send(tx, idx);
 }
 
diff --git a/library/sbcap/SBC_AP_Templates.ttcn b/library/sbcap/SBC_AP_Templates.ttcn
index 0a9519e5..bfe9e972 100644
--- a/library/sbcap/SBC_AP_Templates.ttcn
+++ b/library/sbcap/SBC_AP_Templates.ttcn
@@ -18,6 +18,13 @@ template (value) EUTRAN_CGI ts_SBCAP_ECGI(PLMNidentity plmn_id := '09F107'O, int
 	iE_Extensions := omit
 }
 
+/* 3GPP TS 36.413 9.2.3.16 */
+template (value) TAI ts_SBCAP_TAI(PLMNidentity plmn_id := '09F107'O, uint16_t tac := 1) := {
+	pLMNidentity := plmn_id,
+	tAC := int2oct(tac, 2),
+	iE_Extensions := omit
+}
+
 /* 3GPP TS 36.413 9.2.1.54 */
 template (value) CellId_Broadcast_List_Item ts_SBCAP_CellId_Broadcast_List_Item(
 	template (value) EUTRAN_CGI ecgi := ts_SBCAP_ECGI()) := {
@@ -273,6 +280,38 @@ ts_SBCAP_WRITE_WARNING_RESP(template (value) BIT16 p_msg_id, template (value) BI
 	}
 }
 
+template (value) SBC_AP_PDU
+ts_SBCAP_WRITE_WARNING_RESP_UNKNOWN_TAI(template (value) BIT16 p_msg_id, template (value) BIT16 p_ser_nr,
+		       template (value) SBC_AP_Cause cause := SBC_AP_Cause_message_accepted,
+		       template (value) List_of_TAIs unknown_tai_list := {{ts_SBCAP_TAI}})
+modifies ts_SBCAP_WRITE_WARNING_RESP := {
+	successfulOutcome := {
+		value_ := {
+			write_Replace_Warning_Response := {
+				protocolIEs := {
+					{
+						id := SBC_AP_Constants.id_Message_Identifier,
+						criticality := reject,
+						value_ := { Message_Identifier := p_msg_id }
+					}, {
+						id := SBC_AP_Constants.id_Serial_Number,
+						criticality := reject,
+						value_ := { Serial_Number := p_ser_nr }
+					}, {
+						id := SBC_AP_Constants.id_Cause,
+						criticality := reject,
+						value_ := { Cause := enum2int(valueof(cause)) }
+					}, {
+						id := SBC_AP_Constants.id_Unknown_Tracking_Area_List,
+						criticality := ignore,
+						value_ := { List_of_TAIs := unknown_tai_list }
+					}
+				}
+			}
+		}
+	}
+}
+
 template (present) SBC_AP_PDU
 tr_SBCAP_STOP_WARNING(template (present) BIT16 p_msg_id, template (present) BIT16 p_ser_nr) := {
 	initiatingMessage := {