added hotfix for DCCH bad size limitation (to be checked after merge with develop). Changed UL idle scheduling to improve 5MHz performance, changed DCI aggregation for ue-specific DCIs (reduces contention with SI and RA in subframe 5 for 5 MHz). Added RRC timer for UE release which cleans L1. Still issues in 10 MHz throughput with TCP. 5 MHz seems almost fine.

openair2/RRC/LITE/defs.h

@@ -358,6 +358,7 @@ typedef struct eNB_RRC_UE_s {
   rb_id_t                            enb_gtp_ebi[S1AP_MAX_E_RAB];
 #endif
   uint32_t                           ul_failure_timer;
+  uint32_t                           ue_release_timer;
 } eNB_RRC_UE_t;
 
 typedef uid_t ue_uid_t;

openair2/RRC/LITE/rrc_common.c

@@ -531,6 +531,15 @@ rrc_rx_tx(
 	  break;
 	}
       }
+      if (ue_context_p->ue_context.ue_release_timer>0) {
+	ue_context_p->ue_context.ue_release_timer++;
+	if (ue_context_p->ue_context.ue_release_timer >= 100) {
+	  // remove UE after 10 frames after RRCConnectionRelease is triggered
+	  LOG_I(RRC,"Removing UE %x instance\n",ue_context_p->ue_context.rnti);
+	  ue_to_be_removed = ue_context_p;
+	  break;
+	}
+      }
     }
     if (ue_to_be_removed)
       rrc_eNB_free_UE(ctxt_pP->module_id,ue_to_be_removed);

openair2/RRC/LITE/rrc_eNB.c

@@ -1090,6 +1090,8 @@ rrc_eNB_generate_RRCConnectionRelease(
   memset(buffer, 0, RRC_BUF_SIZE);
 
   size = do_RRCConnectionRelease(ctxt_pP->module_id, buffer,rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id));
+  // set release timer
+  ue_context_pP->ue_context.ue_release_timer=1;
 
   LOG_I(RRC,
         PROTOCOL_RRC_CTXT_UE_FMT" Logical Channel DL-DCCH, Generate RRCConnectionRelease (bytes %d)\n",