[M] Change in osmo-ttcn3-hacks[master]: 5gc: Introduce test TC_connection_inactive - gerrit-log

18 Feb 2026

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/42143?usp=email )
Change subject: 5gc: Introduce test TC_connection_inactive
......................................................................
5gc: Introduce test TC_connection_inactive
The test is expected to fail because open5gs (as of v2.7.3) doesn't
implement such features; see open5gs ticket referenced below.
Related: SYS#7073
Related: open5gs GH#4319
Change-Id: Icf60dde814b7c8ef4cdb4c886423058c7d741a9b
---
M 5gc/C5G_Tests.ttcn
M 5gc/ConnHdlr.ttcn
M 5gc/expected-results.xml
3 files changed, 73 insertions(+), 2 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/43/42143/1

diff --git a/5gc/C5G_Tests.ttcn b/5gc/C5G_Tests.ttcn
index 33aa176..5f1516d 100644
--- a/5gc/C5G_Tests.ttcn
+++ b/5gc/C5G_Tests.ttcn
@@ -202,7 +202,8 @@
    	ngran_pars := g_ngran_pars,
    	ue_pars := valueof(ts_UeParams(ue_idx)),
    	c5g_idx := 0,
-		kset_id := valueof(cs_NAS_KeySetIdentifier_lv(tsc_NasKsi_NoKey, '0'B))
+		kset_id := valueof(cs_NAS_KeySetIdentifier_lv(tsc_NasKsi_NoKey, '0'B)),
+		exp_CoreNetworkAssistanceInformationForInactive := false
    };
    return pars;
 }
@@ -540,6 +541,37 @@
    vc_conn.done;
 }
+/* 3GPP TS 23.502 4.8.1.1(a) Connection Inactive procedure */
+private function f_TC_connection_inactive() runs on ConnHdlr {
+	f_register();
+	f_pdu_sess_establish(false);
+
+	/* Figure 4.8.1.1a-1 step 2: "NG-RAN sends N2 MT Communication Handling request message
+	 * to AMF indicating the UE is transitioning to RRC_INACTIVE state". */
+	f_mt_communication_handling();
+
+
+	f_sleep(1.0);
+	f_ue_context_release();
+}
+testcase TC_connection_inactive() runs on MTC_CT {
+	var ConnHdlr vc_conn;
+	var ConnHdlrPars pars;
+
+	f_init();
+	f_ngap_setup(0);
+
+	pars := f_init_pars(ue_idx := 0);
+	/* Validate we received from CN in "INITIAL CONTEXT SETUP REQUEST":
+	 * "CN MT Communication Handling IE" inside "Core Network Assistance Information for RRC INACTIVE IE",
+	 * 3GPP TS 38.413 9.3.1.15.
+	 * NOTE: current open5gs v2.7.3 doesn't set it, meaning it doesn't support RRC_INACTIVE state. */
+	pars.exp_CoreNetworkAssistanceInformationForInactive := true;
+
+	vc_conn := f_start_handler_with_pars(refers(f_TC_connection_inactive), pars);
+	vc_conn.done;
+}
+
 control {
    execute( TC_ng_setup() );
    execute( TC_ng_setup_unknown_global_gnb_id_plmn() );
@@ -562,6 +594,8 @@
    execute( TC_ue_service_request_cm_connected() );
execute( TC_net_triggered_service_req() );
+	execute( TC_connection_inactive() );
+
 }
/* TODO:
diff --git a/5gc/ConnHdlr.ttcn b/5gc/ConnHdlr.ttcn
index 0d356b9..ae286c5 100644
--- a/5gc/ConnHdlr.ttcn
+++ b/5gc/ConnHdlr.ttcn
@@ -107,7 +107,9 @@
    /* currently used 5GC (index into ngran_pars, NGAP, ...) */
    integer c5g_idx,
    /* Currently set KSI */
-	NAS_KeySetIdentifier kset_id
+	NAS_KeySetIdentifier kset_id,
+	/* Expect "Core Network Assistance Information for RRC INACTIVE" IE present in Inital Context Setup Request */
+	boolean exp_CoreNetworkAssistanceInformationForInactive
 }
type component ConnHdlr extends NGAP_ConnHdlr, GTP1U_ConnHdlr {
@@ -173,6 +175,19 @@
    }
 }
+private function f_tr_ConnHdlr_CoreNetworkAssistanceInformationForInactive() runs on ConnHdlr return template CoreNetworkAssistanceInformationForInactive {
+	var template CoreNetworkAssistanceInformationForInactive exp := omit
+	if (g_pars.exp_CoreNetworkAssistanceInformationForInactive) {
+	 	/* "CN MT Communication Handling IE" inside "Core Network Assistance Information for RRC INACTIVE IE",
+		 * 3GPP TS 38.413 9.3.1.15.
+	 	 * NOTE: current open5gs v2.7.3 doesn't set it, meaning it doesn't support RRC_INACTIVE state. */
+		var template (present) CoreNetworkAssistanceInformationForInactive.iE_Extensions ie_ext;
+		ie_ext := f_mw_CoreNetworkAssistanceInformationForInactive_ExtIEs(p_cN_MT_CommunicationHandling := supported);
+		exp := mw_CoreNetworkAssistanceInformationForInactive(p_iE_Extensions := ie_ext);
+	}
+	return exp;
+}
+
 /* 3GPP TS 24.501 9.6, 3GPP TS 24.007 11.2.3.1a.
  * 0 = "No procedure transaction identity assigned", 255 = "Reserved". */
 private function f_next_pti() runs on ConnHdlr return ProcedureTransactionIdentifier
@@ -365,12 +380,14 @@
    	mw_ngap_initMsg((f_mw_n2_InitialContextSetupRequest(amf_id,
    							    g_pars.ue_pars.ran_id,
    							    p_uEAggregateMaximumBitRate := ?,
+								    p_coreNetworkAssistanceInformationForInactive := f_tr_ConnHdlr_CoreNetworkAssistanceInformationForInactive(),
    							    p_pDUSessionResourceSetupListCxtReq := ?,
    							    p_nextHopNH := ?,
    							    p_maskedIMEISV := ?),
    			 f_mw_n2_InitialContextSetupRequest(amf_id,
    							    g_pars.ue_pars.ran_id,
    							    p_uEAggregateMaximumBitRate := ?,
+								    p_coreNetworkAssistanceInformationForInactive := f_tr_ConnHdlr_CoreNetworkAssistanceInformationForInactive(),
    							    p_pDUSessionResourceSetupListCxtReq := ?,
    							    p_nextHopNH := ?,
    							    p_maskedIMEISV := ?,
@@ -811,6 +828,23 @@
    as_ngap_handle_UeContextReleaseCmd(exp_cause := cause);
 }
+/* 3GPP TS 38.413 8.3.13 "MT Communication Handling"
+ * 3GPP TS 23.502 4.8.1.1(a) Connection Inactive procedure step 2. */
+function f_mt_communication_handling() runs on ConnHdlr
+{
+	var template (value) NGAP_PDU tx_pdu;
+
+	tx_pdu := m_ngap_initMsg(m_n2_MTCommunicationHandlingRequest(
+					g_pars.ue_pars.amf_id,
+					g_pars.ue_pars.ran_id,
+					m_FiveGCAction_HLComActivate(m_hLComActivate(m_nR_Paging_Long_eDRX_Information_for_RRC_INACTIVE(hf1024, s32))),
+					{m_PDUSessionListMTCommHReq_Item(g_pars.ue_pars.sess_pars.id)}));
+	NGAP.send(tx_pdu);
+	NGAP.receive(mw_ngap_succMsg(mw_n2_MTCommunicationHandlingResponse(
+					g_pars.ue_pars.amf_id,
+					g_pars.ue_pars.ran_id)));
+}
+
 /* Handle a PDUSessionResourceSetupRequestTransfer contained inside NGAP InitialContextSetupRequest and return a Result for InitialContextSetupResponse */
 private function f_pdu_handle_session_resource_released_item(PDUSessionResourceToReleaseItemRelCmd cmd) runs on ConnHdlr return PDUSessionResourceReleasedItemRelRes
 {
diff --git a/5gc/expected-results.xml b/5gc/expected-results.xml
index f509895..0472dc7 100644
--- a/5gc/expected-results.xml
+++ b/5gc/expected-results.xml
@@ -15,4 +15,7 @@
   <testcase classname='C5G_Tests' name='TC_ue_service_request_cm_idle_unknown_sess_active' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_ue_service_request_cm_connected' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_net_triggered_service_req' time='MASKED'/>
+  <testcase classname='C5G_Tests' name='TC_connection_inactive' time='MASKED'>
+    <error type='DTE'></error>
+  </testcase>
 </testsuite>
-- 
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: Icf60dde814b7c8ef4cdb4c886423058c7d741a9b
Gerrit-Change-Number: 42143
Gerrit-PatchSet: 1
Gerrit-Owner: pespin pespin@sysmocom.de



    