Fixed bug to save UE ctx on the mme_ue_s1ap_id_map upon reception of the service request. Service request is now working again for the case where the UE is ECM-IDLE.

srsepc/src/mme/mme_gtpc.cc

@@ -222,6 +222,9 @@ mme_gtpc::handle_create_session_response(srslte::gtpc_pdu *cs_resp_pdu)
   ue_emm_ctx_t *emm_ctx = &ue_ctx->emm_ctx;
   ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
 
+  //Save UE IP to nas ctxt
+  emm_ctx->ue_ip.s_addr = cs_resp->paa.ipv4;
+  m_mme_gtpc_log->console("SPGW Allocated IP %s to ISMI %015lu",inet_ntoa(emm_ctx->ue_ip),emm_ctx->imsi);
   //Save SGW ctrl F-TEID in GTP-C context
   std::map<uint64_t,struct gtpc_ctx>::iterator it_g = m_imsi_to_gtpc_ctx.find(imsi);
   if(it_g == m_imsi_to_gtpc_ctx.end())

srsepc/src/mme/s1ap_nas_transport.cc

@@ -712,6 +712,9 @@ s1ap_nas_transport::handle_nas_service_request(uint32_t m_tmsi,
       liblte_security_generate_k_enb(emm_ctx->security_ctxt.k_asme, emm_ctx->security_ctxt.ul_nas_count, emm_ctx->security_ctxt.k_enb);
       m_s1ap_log->info("Generating KeNB with UL NAS COUNT: %d\n",emm_ctx->security_ctxt.ul_nas_count);
       m_s1ap_log->console("UE Ctr TEID %d\n", emm_ctx->sgw_ctrl_fteid.teid);
+
+      //Save UE ctx to MME UE S1AP id
+      m_s1ap->add_ue_ctx_to_mme_ue_s1ap_id_map(ue_ctx);
       m_s1ap->m_s1ap_ctx_mngmt_proc->send_initial_context_setup_request(emm_ctx, ecm_ctx,&ecm_ctx->erabs_ctx[5]);
     }
     else