Check if the UE Ctx Rel complete sender is HO src gNB

src/amf-app/amf_n2.cpp

@@ -1310,21 +1310,21 @@ void amf_n2::handle_itti_message(itti_ue_context_release_complete& itti_msg) {
   }
 
   std::shared_ptr<ue_ngap_context> unc = {};
-
   if (!amf_ue_id_2_ue_ngap_context(amf_ue_ngap_id, unc)) {
     Logger::amf_app().error(
         "No UE NGAP context for amf_ngap_id %s, exit", amf_ue_ngap_id);
     return;
   }
 
-  //verify release cause -> if HandoverSuccessful no further operations required
-  if(unc->release_cause == Ngap_CauseRadioNetwork_successful_handover){
-    std::shared_ptr<gnb_context> gc = {};
+  std::shared_ptr<gnb_context> gc = {};
     if (!assoc_id_2_gnb_context(itti_msg.assoc_id, gc)) {
       Logger::amf_n2().error(
           "gNB with assoc_id (%d) is illegal", itti_msg.assoc_id);
       return;
     }
+
+  //verify release cause -> if HandoverSuccessful no further operations required
+  if(unc->release_cause == Ngap_CauseRadioNetwork_successful_handover && gc->gnb_id == unc->release_gnb){
     remove_ran_ue_ngap_id_2_ngap_context(ran_ue_ngap_id, gc->gnb_id);
     unc->release_cause = 0;
     return;
@@ -2046,20 +2046,30 @@ void amf_n2::handle_itti_message(itti_handover_notify& itti_msg) {
   sctp_s_38412.sctp_send_msg(unc->gnb_assoc_id, 0, &b);
   bdestroy_wrapper(&b);
 
-  if (!amf_ue_id_2_ue_ngap_context(amf_ue_ngap_id, unc)) {
-    Logger::amf_n2().error(
-        "No UE NGAP context with amf_ue_ngap_id (" AMF_UE_NGAP_ID_FMT ")",
-        amf_ue_ngap_id);
+  string ue_context_key =
+      conv::get_ue_context_key(unc->ran_ue_ngap_id, amf_ue_ngap_id);
+  std::shared_ptr<ue_context> uc = {};
+  if (!amf_app_inst->ran_amf_id_2_ue_context(ue_context_key, uc)) {
+    Logger::amf_app().error(
+        "No UE context for ran_amf_id %s, exit", ue_context_key.c_str());
     return;
   }
 
+  //update the NGAP Context
   unc->release_cause         = Ngap_CauseRadioNetwork_successful_handover;
-  unc->last_ran_ue_ngap_id   = unc->ran_ue_ngap_id;
+  unc->release_gnb           = uc->gnb_id;
   unc->ran_ue_ngap_id        = ran_ue_ngap_id;  // store new RAN ID
   unc->target_ran_ue_ngap_id = 0;               // Clear target RAN ID
   unc->ng_ue_state           = NGAP_UE_CONNECTED;
   unc->gnb_assoc_id          = itti_msg.assoc_id;  // update serving gNB
 
+  //update NAS Context
+  nc->ran_ue_ngap_id = ran_ue_ngap_id;
+ 
+  //update User Context
+  uc->ran_ue_ngap_id = ran_ue_ngap_id;
+  uc->gnb_id = gc->gnb_id;
+
   set_ran_ue_ngap_id_2_ue_ngap_context(ran_ue_ngap_id, gc->gnb_id, unc);
 }
 

src/contexts/ue_ngap_context.hpp

@@ -44,11 +44,11 @@ class ue_ngap_context {
     ran_ue_ngap_id        = 0;
     amf_ue_ngap_id        = 0;
     target_ran_ue_ngap_id = 0;
-    last_ran_ue_ngap_id   = 0;
 
     sctp_stream_recv = {};
     sctp_stream_send = {};
 
+    release_gnb         = {};
     release_cause       = {};
     gnb_assoc_id        = {};
     target_gnb_assoc_id = {};
@@ -69,7 +69,6 @@ class ue_ngap_context {
     initialUEMsg.size = 0;
   }
 
-  uint32_t last_ran_ue_ngap_id;
   uint32_t ran_ue_ngap_id;         // 32bits
   long amf_ue_ngap_id : 40;        // 40bits
   uint32_t target_ran_ue_ngap_id;  // 32bits, for HO
@@ -95,8 +94,9 @@ class ue_ngap_context {
 
   OCTET_STRING_t initialUEMsg;
 
-  //store the cause of Release Command
+  //Release Command Cause and source gNB ID in case of HO
   Ngap_CauseRadioNetwork_t release_cause;
+  uint32_t release_gnb;
 };
 
 #endif