Added check for ignoring empty mac dl config messages

openair2/ENB_APP/enb_agent_mac.c

@@ -1369,8 +1369,8 @@ int enb_agent_register_mac_xface(mid_t mod_id, AGENT_MAC_xface *xface) {
   xface->enb_agent_send_sr_info = enb_agent_send_sr_info;
   xface->enb_agent_send_sf_trigger = enb_agent_send_sf_trigger;
   xface->enb_agent_send_update_mac_stats = enb_agent_send_update_mac_stats;
-  //xface->enb_agent_schedule_ue_spec = schedule_ue_spec_default;
-  xface->enb_agent_schedule_ue_spec = schedule_ue_spec_remote;
+  xface->enb_agent_schedule_ue_spec = schedule_ue_spec_default;
+  //xface->enb_agent_schedule_ue_spec = schedule_ue_spec_remote;
   xface->enb_agent_get_pending_dl_mac_config = enb_agent_get_pending_dl_mac_config;
   xface->enb_agent_notify_ue_state_change = enb_agent_ue_state_change;
 

openair2/LAYER2/MAC/eNB_agent_scheduler_dataplane.c

@@ -247,6 +247,11 @@ void apply_ue_spec_scheduling_decisions(mid_t mod_id,
 	}
 	
 	ta_update = (ta_len > 0) ? ue_sched_ctl->ta_update : 0;
+
+	// If there is nothing to schedule, just leave
+	if ((sdu_length_total + ta_len) < 0) { 
+	  return;
+	}
 	
 	offset = generate_dlsch_header((unsigned char*)UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0],
 				       num_sdus,              //num_sdus