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5gc: Add tests for UE release context request procedure

Change-Id: Icaaeb2923fdcaba47a72ed0aedc5661f68c03774
---
M 5gc/C5G_Tests.ttcn
M 5gc/ConnHdlr.ttcn
M 5gc/expected-results.xml
3 files changed, 62 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/93/40893/1

diff --git a/5gc/C5G_Tests.ttcn b/5gc/C5G_Tests.ttcn
index f72fef8..fda9e23 100644
--- a/5gc/C5G_Tests.ttcn
+++ b/5gc/C5G_Tests.ttcn
@@ -330,6 +330,36 @@
 	vc_conn.done;
 }
 
+/* 3GPP TS 23.502 4.2.6 AN Release */
+private function f_TC_ue_context_release_no_pdu_session() runs on ConnHdlr {
+	f_register();
+	f_ue_context_release();
+}
+testcase TC_ue_context_release_no_pdu_session() runs on MTC_CT {
+	f_init();
+	f_ngap_setup(0);
+
+	var ConnHdlrPars pars := f_init_pars(ue_idx := 0);
+	var ConnHdlr vc_conn;
+	vc_conn := f_start_handler_with_pars(refers(f_TC_ue_context_release_no_pdu_session), pars);
+	vc_conn.done;
+}
+private function f_TC_ue_context_release_with_pdu_session() runs on ConnHdlr {
+	f_register();
+	f_pdu_sess_establish();
+	f_sleep(1.0);
+	f_ue_context_release();
+}
+testcase TC_ue_context_release_with_pdu_session() runs on MTC_CT {
+	f_init();
+	f_ngap_setup(0);
+
+	var ConnHdlrPars pars := f_init_pars(ue_idx := 0);
+	var ConnHdlr vc_conn;
+	vc_conn := f_start_handler_with_pars(refers(f_TC_ue_context_release_with_pdu_session), pars);
+	vc_conn.done;
+}
+
 private function f_TC_register_ping4() runs on ConnHdlr {
 	f_register();
 	f_pdu_sess_establish();
@@ -371,6 +401,8 @@
 	execute( TC_ng_setup_wrong_tac() );
 	execute( TC_ng_register() );
 	execute( TC_periodic_registration_updating() );
+	execute( TC_ue_context_release_no_pdu_session() );
+	execute( TC_ue_context_release_with_pdu_session() );
 	execute( TC_ng_register_ping4() );
 	execute( TC_ng_register_ping4_256() );
 }
diff --git a/5gc/ConnHdlr.ttcn b/5gc/ConnHdlr.ttcn
index dbec212..c72a620 100644
--- a/5gc/ConnHdlr.ttcn
+++ b/5gc/ConnHdlr.ttcn
@@ -455,13 +455,14 @@
 }
 
 /* 3GPP TS 38.413 8.3.3 UE Context Release (AMF initiated) */
-private altstep as_ngap_handle_UeContextReleaseCmd() runs on ConnHdlr {
+private altstep as_ngap_handle_UeContextReleaseCmd(template (present) Cause exp_cause := ?) runs on ConnHdlr {
 	var NGAP_PDU rx_ngap;
 	var template (present) NGAP_PDU exp_ngap :=
 		mw_ngap_initMsg(mw_n2_UEContextReleaseCommand(
 					mw_uE_NGAP_IDs_uE_NGAP_ID_pair(
 						mw_uE_NGAP_ID_pair(g_pars.ue_pars.amf_id,
-								   g_pars.ue_pars.ran_id))));
+								   g_pars.ue_pars.ran_id)),
+					p_cause := exp_cause));
 
 	[] NGAP.receive(exp_ngap) -> value rx_ngap {
 		NGAP.send(m_ngap_succMsg(f_ts_n2_UEContextReleaseComplete(g_pars.ue_pars.amf_id,
@@ -470,6 +471,31 @@
 	}
 }
 
+/* 3GPP TS 38.413 8.3.2 UE Context Release Request (NG-RAN node initiated),
+ * 3GPP TS 23.502 4.2.6 AN Release */
+function f_ue_context_release(template (value) Cause cause := m_cause_radioNetwork(unspecified)) runs on ConnHdlr {
+	var template (value) NGAP_PDU tx_pdu;
+
+	if (ispresent(g_pars.ue_pars.sess_pars.cn_gtpu_teid)) {
+		var template (value) PDUSessionResourceListCxtRelReq li_req;
+		var template (value) PDUSessionResourceItemCxtRelReq it_req;
+		it_req := m_pDUSessionResourceItemCxtRelReq(g_pars.ue_pars.sess_pars.id);
+		li_req := { it_req };
+		tx_pdu := m_ngap_initMsg(m_n2_UEContextReleaseRequest_withPDUSessionList(
+						g_pars.ue_pars.amf_id,
+						g_pars.ue_pars.ran_id,
+						li_req,
+						cause));
+	} else {
+		tx_pdu := m_ngap_initMsg(m_n2_UEContextReleaseRequest(
+						g_pars.ue_pars.amf_id,
+						g_pars.ue_pars.ran_id,
+						cause));
+	}
+	NGAP.send(tx_pdu);
+	as_ngap_handle_UeContextReleaseCmd(exp_cause := cause);
+}
+
 /* 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 a94eb6f..99ded9c 100644
--- a/5gc/expected-results.xml
+++ b/5gc/expected-results.xml
@@ -5,6 +5,8 @@
   <testcase classname='C5G_Tests' name='TC_ng_setup' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_ng_register' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_periodic_registration_updating' time='MASKED'/>
+  <testcase classname='C5G_Tests' name='TC_ue_context_release_no_pdu_session' time='MASKED'/>
+  <testcase classname='C5G_Tests' name='TC_ue_context_release_with_pdu_session' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_ng_register_ping4' time='MASKED'/>
   <testcase classname='C5G_Tests' name='TC_ng_register_ping4_256' time='MASKED'/>
 </testsuite>

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