sched: handle the failure of creation of a UE by signalling false back to the MAC

Author: frankist

lib/scheduler/scheduler_impl.cpp

@@ -57,7 +57,7 @@ void scheduler_impl::handle_ue_creation_request(const sched_ue_creation_request_
   error_type<std::string> result =
       config_validators::validate_sched_ue_creation_request_message(ue_request, cells[pcell_index]->cell_cfg);
   if (result.is_error()) {
-    report_fatal_error(
+    logger.warning(
         "ue={} rnti={:#x}: Discarding invalid UE creation request. Cause: {}", ue_request.crnti, result.error());
     config_notifier.on_ue_config_complete(ue_request.ue_index, false);
   }

lib/scheduler/ue_scheduling/ue_event_manager.cpp

@@ -36,6 +36,14 @@ void ue_event_manager::handle_ue_creation_request(const sched_ue_creation_reques
 
   // Defer UE object addition to ue list to the slot indication handler.
   common_events.emplace(MAX_NOF_DU_UES, [this, u = std::move(u)]() mutable {
+    if (ue_db.contains(u->ue_index)) {
+      logger.error("ue={} rnti={:#x}: Create of UE failed. Cause: A UE with the same index already exists",
+                   u->ue_index,
+                   u->crnti);
+      mac_notifier.on_ue_config_complete(u->ue_index, false);
+      return;
+    }
+
     // Insert UE in UE repository.
     du_ue_index_t   ueidx       = u->ue_index;
     rnti_t          rnti        = u->crnti;