fix handling of CRNTI CE in the RRC. The scheduler should not allocate more grants for the new rnti after this point.

srsenb/hdr/stack/rrc/rrc_ue.h

@@ -46,6 +46,7 @@ public:
   void        activity_timer_expired(const activity_timeout_type_t type);
   void        rlf_timer_expired(uint32_t timeout_id);
   void        max_rlc_retx_reached();
+  void        deactivate_bearers() { mac_ctrl.set_radio_bearer_state(sched_interface::ue_bearer_cfg_t::IDLE); }
 
   rrc_state_t get_state();
   void        get_metrics(rrc_ue_metrics_t& ue_metrics) const;

srsenb/src/stack/rrc/rrc.cc

@@ -222,12 +222,16 @@ int rrc::add_user(uint16_t rnti, const sched_interface::ue_cfg_t& sched_ue_cfg)
 void rrc::upd_user(uint16_t new_rnti, uint16_t old_rnti)
 {
   // Remove new_rnti
-  rem_user_thread(new_rnti);
+  auto new_ue_it = users.find(new_rnti);
+  if (new_ue_it != users.end()) {
+    new_ue_it->second->deactivate_bearers();
+    rem_user_thread(new_rnti);
+  }
 
   // Send Reconfiguration to old_rnti if is RRC_CONNECT or RRC Release if already released here
   auto old_it = users.find(old_rnti);
   if (old_it == users.end()) {
-    send_rrc_connection_reject(old_rnti);
+    logger.info("rnti=0x%x received MAC CRNTI CE: 0x%x, but old context is unavailable", new_rnti, old_rnti);
     return;
   }
   ue* ue_ptr = old_it->second.get();