[M] Change in osmo-ttcn3-hacks[master]: 5gc: Introduce test TC_handover_inter_ngran_xn

28 Feb 2026

pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/42241?usp=email )
Change subject: 5gc: Introduce test TC_handover_inter_ngran_xn
......................................................................
5gc: Introduce test TC_handover_inter_ngran_xn
Change-Id: I4de3f0a02ddbccc85988754a4cd83fe67b1453dc
---
M 5gc/C5G_Tests.ttcn
M 5gc/ConnHdlr.ttcn
M 5gc/expected-results.xml
M library/NGAP_Emulation.ttcn
M library/NGAP_Functions.ttcn
M library/ngap/NGAP_EncDec.cc
M library/ngap/NGAP_Templates.ttcn
M library/ngap/NGAP_Types.ttcn
8 files changed, 228 insertions(+), 16 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/41/42241/1

diff --git a/5gc/C5G_Tests.ttcn b/5gc/C5G_Tests.ttcn
index 3844f95..028178d 100644
--- a/5gc/C5G_Tests.ttcn
+++ b/5gc/C5G_Tests.ttcn
@@ -613,6 +613,69 @@
    vc_conn.done;
 }
+/* 3GPP TS 23.502 4.9.1.2.2 Xn based inter NG-RAN handover without User Plane function re-allocation */
+private function f_TC_handover_inter_ngran_xn_source() runs on ConnHdlr {
+	f_register();
+	f_pdu_sess_establish();
+	f_sleep(1.0);
+	f_ping4(g_pars.ue_pars.sess_pars.run_prog_pars.ping_hostname);
+
+	var NG_NAS_UE_State nus := f_ngap_obtain_nus(g_pars.ue_pars.ran_id);
+
+	/* TODO: conditional, transmit "1a. RAN Usage data report" */
+	COORD.send(Handover_Xn_Pars:{source_amf_id := g_pars.ue_pars.amf_id,
+				     guti := g_pars.ue_pars.guti,
+				     pti := g_pars.ue_pars.pti,
+				     sess_pars := g_pars.ue_pars.sess_pars,
+				     kset_id := g_pars.kset_id,
+				     nus := nus });
+}
+private function f_TC_handover_inter_ngran_xn_target() runs on ConnHdlr {
+	var Handover_Xn_Pars ho_xn_pars;
+
+	COORD.receive(Handover_Xn_Pars:?) -> value ho_xn_pars;
+	log("HANDOVER STARTED!");
+	g_pars.ue_pars.guti := ho_xn_pars.guti;
+	g_pars.ue_pars.pti := ho_xn_pars.pti;
+	g_pars.ue_pars.sess_pars.id := ho_xn_pars.sess_pars.id;
+	g_pars.ue_pars.sess_pars.cn_gtpu_ip := ho_xn_pars.sess_pars.cn_gtpu_ip;
+	g_pars.ue_pars.sess_pars.cn_gtpu_teid := ho_xn_pars.sess_pars.cn_gtpu_teid;
+	g_pars.ue_pars.sess_pars.qos_rules := ho_xn_pars.sess_pars.qos_rules;
+	g_pars.ue_pars.sess_pars.ue_ip := ho_xn_pars.sess_pars.ue_ip;
+	g_pars.kset_id := ho_xn_pars.kset_id;
+
+	f_n2_path_switch(ho_xn_pars.source_amf_id);
+	f_ngap_set_nus(g_pars.ue_pars.ran_id, ho_xn_pars.nus)
+	f_sleep(1.0);
+
+	f_pdu_sess_create_tun();
+	f_ping4(g_pars.ue_pars.sess_pars.run_prog_pars.ping_hostname);
+
+	f_pdu_sess_release();
+	f_deregister();
+}
+testcase TC_handover_inter_ngran_xn() runs on MTC_CT {
+	var ConnHdlr vc_conn[2];
+	var integer i;
+
+	f_init();
+	f_ngap_setup(0);
+	f_ngap_setup(1);
+
+	var ConnHdlrPars pars := f_init_pars(ue_idx := 0, c5g_idx := 0);
+	vc_conn[0] := f_start_handler_create(ngap_idx := 0);
+	vc_conn[1] := f_start_handler_create(ngap_idx := 1);
+	connect(vc_conn[0]:COORD, vc_conn[1]:COORD);
+
+	f_start_handler_run(vc_conn[0], refers(f_TC_handover_inter_ngran_xn_source), pars);
+	pars.c5g_idx := 1;
+	pars.ue_pars.sess_pars.ran_gtpu_teid := int2oct(oct2int(pars.ue_pars.sess_pars.ran_gtpu_teid) + 1, 4);
+	f_start_handler_run(vc_conn[1], refers(f_TC_handover_inter_ngran_xn_target), pars);
+
+	vc_conn[0].done;
+	vc_conn[1].done;
+}
+
 control {
    execute( TC_ng_setup() );
    execute( TC_ng_setup_unknown_global_gnb_id_plmn() );
@@ -638,6 +701,8 @@
    execute( TC_connection_inactive() );
    execute( TC_connection_suspend() );
+	execute( TC_handover_inter_ngran_xn() );
+
 }
/* TODO:
diff --git a/5gc/ConnHdlr.ttcn b/5gc/ConnHdlr.ttcn
index ce7d38f..da0d3d9 100644
--- a/5gc/ConnHdlr.ttcn
+++ b/5gc/ConnHdlr.ttcn
@@ -49,8 +49,8 @@
 import from GTPv1U_Emulation all;
 import from UECUPS_Types all;
-/* (maximum) number of emulated eNBs */
-const integer NUM_NGRAN := 1;
+/* (maximum) number of emulated gNBs */
+const integer NUM_NGRAN := 2;
/* parameters of emulated gNB / ng-eNB */
 type record NGRANParams {
@@ -112,7 +112,25 @@
    boolean exp_CoreNetworkAssistanceInformationForInactive
 }
+/* Kind of 3GPP TS 38.423 9.1.1.1 HANDOVER REQUEST plus
+ * 3GPP TS 38.423 8.2.4 RETRIEVE UE CONTEXT RESPONSE (see 9.1.1.9 and 9.2.1.13 too). */
+type record Handover_Xn_Pars {
+	AMF_UE_NGAP_ID source_amf_id,
+	octetstring guti,
+	ProcedureTransactionIdentifier pti,
+	PDUSessionParams sess_pars,
+	NAS_KeySetIdentifier kset_id,
+	NG_NAS_UE_State	nus /* 3GPP TS 38.423 9.2.1.13 UE Context Information */
+};
+
+type port ConnHdlr_Coord_PT message
+{
+	inout charstring, Handover_Xn_Pars;
+} with { extension "internal" };
+
 type component ConnHdlr extends NGAP_ConnHdlr, GTP1U_ConnHdlr {
+	port ConnHdlr_Coord_PT COORD;
+
    var ConnHdlrPars g_pars;
    var UeDerivedKeys g_keys;
@@ -217,6 +235,16 @@
    return valueof(st);
 }
+function f_UESecurityCapabilities() runs on ConnHdlr return UESecurityCapabilities
+{
+	var template (value) UESecurityCapabilities cap;
+	cap := m_uESecurityCapabilities(p_nRencryptionAlgorithms := '0000000000000000'B,
+					p_nRintegrityProtectionAlgorithms := '0000000000000000'B,
+					p_eUTRAencryptionAlgorithms := '0000000000000000'B,
+					p_eUTRAintegrityProtectionAlgorithms := '0000000000000000'B);
+	return valueof(cap);
+}
+
 /* 3GPP TS 24.501 5.4.1.3.2, 3GPP TS 33.501 6.1.3.2 */
 private altstep as_ngap_handle_auth(boolean allow_resync := true) runs on ConnHdlr {
    var NG_NAS_DL_Message_Type rx_nas;
@@ -881,6 +909,43 @@
    				g_pars.ue_pars.ran_id)));
 }
+/* 3GPP TS 38.413 8.4.4 Path Switch Request
+ * 3GPP TS 38.413 9.2.3.8 PATH SWITCH REQUEST
+ * 3GPP TS 23.502 4.9.1.2.2 Xn based inter NG-RAN handover without User Plane function re-allocation */
+function f_n2_path_switch(AMF_UE_NGAP_ID source_amf_id) runs on ConnHdlr
+{
+	var template (value) UPTransportLayerInformation utla;
+	var template (value) PathSwitchRequestTransfer transfer;
+	var octetstring transfer_enc;
+	var template (value) PDUSessionResourceToBeSwitchedDLItem it;
+	var template (value) NGAP_PDU tx_pdu;
+	var NGAP_PDU rx_pdu;
+
+	utla := m_uPTransportLayerInformation_gTPTunnel(
+			m_gTPTunnel(p_tla := oct2bit(f_inet_addr(g_pars.ue_pars.sess_pars.ran_gtpu_ip)),
+				    p_gtp_teid := g_pars.ue_pars.sess_pars.ran_gtpu_teid));
+	transfer := m_pathSwitchRequestTransfer(p_dL_NGU_UP_TNLInformation := utla,
+						p_qosFlowAcceptedList := { m_qosFlowAcceptedItem(1) },
+						p_dL_NGU_TNLInformationReused := omit,
+						p_userPlaneSecurityInformation := omit);
+	transfer_enc := enc_NGAP_PathSwitchRequestTransfer(valueof(transfer));
+	it := m_pDUSessionResourceToBeSwitchedDLItem(g_pars.ue_pars.sess_pars.id,
+						     transfer_enc);
+
+	tx_pdu := m_ngap_initMsg(m_n2_PathSwitchRequest(
+					g_pars.ue_pars.ran_id,
+					source_amf_id,
+					f_ULI(),
+					f_UESecurityCapabilities(),
+					{ it }));
+	NGAP.send(tx_pdu);
+	NGAP.receive(mw_ngap_succMsg(mw_n2_PathSwitchRequestAcknowledge(?, g_pars.ue_pars.ran_id))) -> value rx_pdu;
+
+	/* Update amf_id: */
+	var PathSwitchRequestAcknowledge path_switch_ack := rx_pdu.successfulOutcome.value_.PathSwitchRequestAcknowledge;
+	g_pars.ue_pars.amf_id := path_switch_ack.protocolIEs[0].value_.aMF_UE_NGAP_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 22a18be..2333f8d 100644
--- a/5gc/expected-results.xml
+++ b/5gc/expected-results.xml
@@ -23,4 +23,5 @@
       C5G_Tests.ttcn:MASKED TC_connection_suspend testcase
     </failure>
   </testcase>
+  <testcase classname='C5G_Tests' name='TC_handover_inter_ngran_xn' time='MASKED'/>
 </testsuite>
diff --git a/library/NGAP_Emulation.ttcn b/library/NGAP_Emulation.ttcn
index 22eb605..d050d2f 100644
--- a/library/NGAP_Emulation.ttcn
+++ b/library/NGAP_Emulation.ttcn
@@ -117,12 +117,16 @@
 signature NGAPEM_register(in AMF_UE_NGAP_ID amf_id, in RAN_UE_NGAP_ID ran_id, in NGAP_ConnHdlr hdlr);
 signature NGAPEM_register_proc(in integer procedureCode, in NGAP_ConnHdlr hdlr);
 signature NGAPEM_obtain_amf_id() return AMF_UE_NGAP_ID;
+signature NGAPEM_obtain_nus(in RAN_UE_NGAP_ID ran_id) return NG_NAS_UE_State;
+signature NGAPEM_set_nus(in RAN_UE_NGAP_ID ran_id, in NG_NAS_UE_State nus);
 //signature NGAPEM_derive_nas_token(in octetstring kasme, in NGAP_ConnHdlr hdlr, out OCT32 nas_token);
type port NGAPEM_PROC_PT procedure {
    inout NGAPEM_register;
    inout NGAPEM_register_proc;
    inout NGAPEM_obtain_amf_id;
+	inout NGAPEM_obtain_nus;
+	inout NGAPEM_set_nus;
    //inout NGAPEM_derive_nas_token;
 } with { extension "internal" };
@@ -288,13 +292,18 @@
    return -1; /* make ttcn3 compiler happy */
 }
-private function f_assoc_id_by_comp(NGAP_ConnHdlr client)
+private function f_assoc_id_by_comp(NGAP_ConnHdlr client, template (omit) RAN_UE_NGAP_ID ran_id := omit)
 runs on NGAP_Emulation_CT return integer {
    var integer i;
    for (i := 0; i < sizeof(NGapAssociationTable); i := i+1) {
-		if (NGapAssociationTable[i].comp_ref == client) {
-			return i;
+		if (NGapAssociationTable[i].comp_ref != client) {
+			continue;
    	}
+		if (not istemplatekind(ran_id, "omit") and
+		    not match(NGapAssociationTable[i].ran_ue_ngap_id, ran_id)) {
+			continue;
+		}
+		return i;
    }
    setverdict(fail, "NGAP Association Table not found by component ", client);
    mtc.stop;
@@ -481,6 +490,7 @@
    	var charstring vlr_name, amf_name;
    	var integer ai;
    	var octetstring kasme;
+		var NG_NAS_UE_State nus;
alt {
    	/* Configuration primitive from client */
@@ -518,6 +528,15 @@
    		/* Pass message through */
    		NGAP.send(t_NGAP_Send(g_ngap_conn_id, msg));
    		}
+		/* NGAP from client: PathSwitch */
+		[] NGAP_CLIENT.receive(mw_ngap_initMsg(mw_n2_PathSwitchRequest)) -> value msg sender vc_conn {
+			/* create a table entry about this connection */
+			ai := f_ngap_id_table_add(vc_conn, omit, valueof(f_NGAP_get_RAN_UE_NGAP_ID(msg)));
+			/* Store ULI so we can use it for generating UlNasTransport from NAS */
+			NGapAssociationTable[ai].uli := msg.initiatingMessage.value_.PathSwitchRequest.protocolIEs[2].value_.userLocationInformation;
+			/* Pass message through */
+			NGAP.send(t_NGAP_Send(g_ngap_conn_id, msg));
+			}
    	/* NAS from client: Wrap in NGAP Uplink NAS Transport */
    	[] NGAP_CLIENT.receive(NG_NAS_UL_Message_Type:?) -> value ul_nas_msg sender vc_conn {
    		var integer assoc_id := f_assoc_id_by_comp(vc_conn);
@@ -612,6 +631,15 @@
    		amf_id := NGapAssociationTable[i].amf_ue_ngap_id;
    		NGAP_PROC.reply(NGAPEM_obtain_amf_id:{} value amf_id) to vc_conn;
    		}
+		[] NGAP_PROC.getcall(NGAPEM_obtain_nus:{?}) -> param(ran_id) sender vc_conn {
+			var integer i := f_assoc_id_by_comp(vc_conn, ran_id);
+			NGAP_PROC.reply(NGAPEM_obtain_nus:{ran_id} value NGapAssociationTable[i].nus) to vc_conn;
+			}
+		[] NGAP_PROC.getcall(NGAPEM_set_nus:{?, ?}) -> param(ran_id, nus) sender vc_conn {
+			var integer i := f_assoc_id_by_comp(vc_conn, ran_id);
+			NGapAssociationTable[i].nus := nus;
+			NGAP_PROC.reply(NGAPEM_set_nus:{ran_id, nus}) to vc_conn;
+			}
 //		[] NGAP_PROC.getcall(NGAPEM_derive_nas_token:{?, ?, -}) -> param(kasme, vc_conn) {
 //			var integer assoc_id := f_assoc_id_by_comp(vc_conn);
 //			var OCT32 nas_token := f_kdf_nas_token(kasme, NGapAssociationTable[assoc_id].nus.tx_count)
@@ -721,4 +749,19 @@
    }
 }
+function f_ngap_obtain_nus(RAN_UE_NGAP_ID ran_id) runs on NGAP_ConnHdlr return NG_NAS_UE_State {
+	var NG_NAS_UE_State nus;
+	NGAP_PROC.call(NGAPEM_obtain_nus:{ran_id}) {
+		[] NGAP_PROC.getreply(NGAPEM_obtain_nus:{ran_id}) -> value nus {
+			return nus;
+		}
+	}
+}
+
+function f_ngap_set_nus(RAN_UE_NGAP_ID ran_id, NG_NAS_UE_State nus) runs on NGAP_ConnHdlr {
+	NGAP_PROC.call(NGAPEM_set_nus:{ran_id, nus}) {
+		[] NGAP_PROC.getreply(NGAPEM_set_nus:{ran_id, nus});
+	}
+}
+
 }
diff --git a/library/NGAP_Functions.ttcn b/library/NGAP_Functions.ttcn
index e1fcf6d..5d45c43 100644
--- a/library/NGAP_Functions.ttcn
+++ b/library/NGAP_Functions.ttcn
@@ -45,6 +45,9 @@
    } else if (ischosen(ngap.successfulOutcome)) {
    	var SuccessfulOutcome so := ngap.successfulOutcome;
    	select (so.procedureCode) {
+		case (id_PathSwitchRequest) {
+			return so.value_.PathSwitchRequestAcknowledge.protocolIEs[0].value_.aMF_UE_NGAP_ID;
+			}
    	case (?) {
    		return omit;
    		/* TODO */
@@ -92,11 +95,17 @@
    	case (id_PDUSessionResourceRelease) {
    		return im.value_.pDUSessionResourceReleaseCommand.protocolIEs[1].value_.rAN_UE_NGAP_ID;
    		}
+		case (id_PathSwitchRequest) {
+			return im.value_.PathSwitchRequest.protocolIEs[0].value_.RAN_UE_NGAP_ID;
+			}
    	/* TODO */
    	}
    } else if (ischosen(ngap.successfulOutcome)) {
    	var SuccessfulOutcome so := ngap.successfulOutcome;
    	select (so.procedureCode) {
+		case (id_PathSwitchRequest) {
+			return so.value_.PathSwitchRequestAcknowledge.protocolIEs[1].value_.rAN_UE_NGAP_ID;
+			}
    	case (?) {
    		return omit;
    		/* TODO */
diff --git a/library/ngap/NGAP_EncDec.cc b/library/ngap/NGAP_EncDec.cc
index 8b825d5..9e3ccd2 100644
--- a/library/ngap/NGAP_EncDec.cc
+++ b/library/ngap/NGAP_EncDec.cc
@@ -129,4 +129,24 @@
    return ret;
 }
+OCTETSTRING enc__NGAP__PathSwitchRequestTransfer(const NGAP__IEs::PathSwitchRequestTransfer &p)
+{
+	TTCN_Buffer TTCN_buf;
+	TTCN_buf.clear();
+	p.encode(NGAP__IEs::PathSwitchRequestTransfer_descr_, TTCN_buf,
+		   TTCN_EncDec::CT_PER, PER_ALIGNED);
+	return OCTETSTRING(TTCN_buf.get_len(), TTCN_buf.get_data());
+}
+
+NGAP__IEs::PathSwitchRequestTransfer dec__NGAP__PathSwitchRequestTransfer(const OCTETSTRING &stream)
+{
+	NGAP__IEs::PathSwitchRequestTransfer ret;
+	TTCN_Buffer TTCN_buf;
+	TTCN_buf.clear();
+	TTCN_buf.put_os(stream);
+	ret.decode(NGAP__IEs::PathSwitchRequestTransfer_descr_, TTCN_buf,
+		   TTCN_EncDec::CT_PER, PER_ALIGNED);
+	return ret;
+}
+
 }
diff --git a/library/ngap/NGAP_Templates.ttcn b/library/ngap/NGAP_Templates.ttcn
index 0931687..6626cc1 100644
--- a/library/ngap/NGAP_Templates.ttcn
+++ b/library/ngap/NGAP_Templates.ttcn
@@ -4891,16 +4891,16 @@
                                               PathSwitchRequest := {
                                                                     protocolIEs := {
                                                                                     {
-                                                                                        id := id_AMF_UE_NGAP_ID,
-                                                                                        criticality := reject,
-                                                                                        value_ := { AMF_UE_NGAP_ID := p_amfUeNgapID }
-                                                                                    },
-                                                                                    {
                                                                                         id := id_RAN_UE_NGAP_ID,
                                                                                         criticality := reject,
                                                                                         value_ := { RAN_UE_NGAP_ID := p_ranUeNgapID }
                                                                                     },
                                                                                     {
+                                                                                        id := id_SourceAMF_UE_NGAP_ID,
+                                                                                        criticality := reject,
+                                                                                        value_ := { AMF_UE_NGAP_ID := p_amfUeNgapID }
+                                                                                    },
+                                                                                    {
                                                                                         id := id_UserLocationInformation,
                                                                                         criticality := ignore,
                                                                                         value_ := { UserLocationInformation := p_userLocationInformation }
@@ -4940,16 +4940,16 @@
                                               PathSwitchRequest := {
                                                                     protocolIEs := {
                                                                                     {
-                                                                                        id := id_AMF_UE_NGAP_ID,
-                                                                                        criticality := reject,
-                                                                                        value_ := { AMF_UE_NGAP_ID := p_amfUeNgapID }
-                                                                                    },
-                                                                                    {
                                                                                         id := id_RAN_UE_NGAP_ID,
                                                                                         criticality := reject,
                                                                                         value_ := { RAN_UE_NGAP_ID := p_ranUeNgapID }
                                                                                     },
                                                                                     {
+                                                                                        id := id_SourceAMF_UE_NGAP_ID,
+                                                                                        criticality := reject,
+                                                                                        value_ := { AMF_UE_NGAP_ID := p_amfUeNgapID }
+                                                                                    },
+                                                                                    {
                                                                                         id := id_UserLocationInformation,
                                                                                         criticality := ignore,
                                                                                         value_ := { UserLocationInformation := p_userLocationInformation }
@@ -5027,7 +5027,8 @@
                                                                                                 template (present) AMF_UE_NGAP_ID p_amfUeNgapID := ?,
                                                                                                 template (present) RAN_UE_NGAP_ID p_ranUeNgapID := ?,
                                                                                                 template (present) SecurityContext p_securityContext := ?,
-                                                                                                template (present) PDUSessionResourceSwitchedList p_pDUSessionResourceSwitchedList := ?
+                                                                                                template (present) PDUSessionResourceSwitchedList p_pDUSessionResourceSwitchedList := ?,
+                                                                                                template (present) AllowedNSSAI p_allowedNSSAI := ?
                                                                                                 ) := {
                             procedureCode := id_PathSwitchRequest,
                             criticality   := reject,
@@ -5053,6 +5054,11 @@
                                                                                         id := id_PDUSessionResourceSwitchedList,
                                                                                         criticality := ignore,
                                                                                         value_ := { PDUSessionResourceSwitchedList := p_pDUSessionResourceSwitchedList }
+                                                                                    },
+                                                                                    {
+                                                                                        id := id_AllowedNSSAI,
+                                                                                        criticality := reject,
+                                                                                        value_ := { AllowedNSSAI := p_allowedNSSAI }
                                                                                     }
                                                                                    }
                                                                     }
diff --git a/library/ngap/NGAP_Types.ttcn b/library/ngap/NGAP_Types.ttcn
index d9523b4..394cb24 100644
--- a/library/ngap/NGAP_Types.ttcn
+++ b/library/ngap/NGAP_Types.ttcn
@@ -20,4 +20,7 @@
external function enc_NGAP_UEContextSuspendRequestTransfer(NGAP_IEs.UEContextSuspendRequestTransfer p) return octetstring;
    external function dec_NGAP_UEContextSuspendRequestTransfer(in octetstring pdu) return NGAP_IEs.UEContextSuspendRequestTransfer;
+
+	external function enc_NGAP_PathSwitchRequestTransfer(NGAP_IEs.PathSwitchRequestTransfer p) return octetstring;
+	external function dec_NGAP_PathSwitchRequestTransfer(in octetstring pdu) return NGAP_IEs.PathSwitchRequestTransfer;
 }
-- 
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I4de3f0a02ddbccc85988754a4cd83fe67b1453dc
Gerrit-Change-Number: 42241
Gerrit-PatchSet: 1
Gerrit-Owner: pespin pespin@sysmocom.de



    

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[M] Change in osmo-ttcn3-hacks[master]: 5gc: Introduce test TC_handover_inter_ngran_xn