removed assertion in MAC layer and adjusted generation of MSG4 to handle when...

removed assertion in MAC layer and adjusted generation of MSG4 to handle when CCCH message is not present. UL CCCH is now received in CU, but asserts. Need to add code in DU to handle scheduling of DL-CCCH in later subframe. In current state, DL-CCCH will only come out if it is ready for MSG$ transmission.

openair2/F1AP/f1ap_itti_messaging.c

@@ -55,6 +55,7 @@ void du_f1ap_itti_send_sctp_data_req(instance_t instance, int32_t assoc_id, uint
   sctp_data_req->buffer_length = buffer_length;
   sctp_data_req->stream        = stream;
 
+  printf("Sending ITTI message to SCTP Task\n");
   itti_send_msg_to_task(TASK_SCTP, instance, message_p);
 }
 

openair2/LAYER2/MAC/eNB_scheduler_RA.c

@@ -1009,13 +1009,14 @@ generate_Msg4(module_id_t module_idP, int CC_idP, frame_t frameP,
 #endif
     {
     // This is normal LTE case
-	LOG_D(MAC, "generate_Msg4 1 ra->Msg4_frame SFN/SF: %d.%d,  frameP SFN/SF: %d.%d FOR eNB_Mod: %d \n", ra->Msg4_frame, ra->Msg4_subframe, frameP, subframeP, module_idP);
+	LOG_I(MAC, "generate_Msg4 ra->Msg4_frame SFN/SF: %d.%d,  frameP SFN/SF: %d.%d FOR eNB_Mod: %d \n", ra->Msg4_frame, ra->Msg4_subframe, frameP, subframeP, module_idP);
     	if ((ra->Msg4_frame == frameP) && (ra->Msg4_subframe == subframeP)) {
 
     	    // Get RRCConnectionSetup for Piggyback
     	    /*rrc_sdu_length = mac_rrc_data_req(module_idP, CC_idP, frameP, CCCH, 1,	// 1 transport block
     					      &cc[CC_idP].CCCH_pdu.payload[0], ENB_FLAG_YES, module_idP, 0);	// not used in this case*/
 
+	  // check if there's data on the CCCH to send with Msg4
 	  rrc_sdu_length = mac_rrc_data_req(module_idP, CC_idP, frameP, CCCH, 1,	// 1 transport block
 					    &cc[CC_idP].CCCH_pdu.payload[0], 0);	// not used in this case
 	  
@@ -1023,14 +1024,17 @@ generate_Msg4(module_id_t module_idP, int CC_idP, frame_t frameP,
     	    	  "[eNB %d][RAPROC] CC_id %d Frame %d, subframeP %d: UE_id %d, rrc_sdu_length %d\n",
     	    	  module_idP, CC_idP, frameP, subframeP, UE_id, rrc_sdu_length);
 
-    	    AssertFatal(rrc_sdu_length > 0,
-    			"[MAC][eNB Scheduler] CCCH not allocated, rrc_sdu_length: %d\n", rrc_sdu_length);
+	  //    	    AssertFatal(rrc_sdu_length > 0,
+	  //    			"[MAC][eNB Scheduler] CCCH not allocated, rrc_sdu_length: %d\n", rrc_sdu_length);
 
 
 
-	    LOG_D(MAC,
+	  if (rrc_sdu_length > 0) LOG_I(MAC,
 					"[eNB %d][RAPROC] CC_id %d Frame %d, subframeP %d: Generating Msg4 with RRC Piggyback (RNTI %x)\n",
 					module_idP, CC_idP, frameP, subframeP, ra->rnti);
+	  else LOG_I(MAC,
+		     "eNB %d][RAPROC] CC_id %d Frame %d, subframeP %d: Generating Msg4 without RRC Piggyback (RNTI %x)\n",
+		     module_idP, CC_idP, frameP, subframeP, ra->rnti);
 	  
 	  /// Choose first 4 RBs for Msg4, should really check that these are free!
 	  first_rb = 0;
@@ -1128,7 +1132,9 @@ generate_Msg4(module_id_t module_idP, int CC_idP, frame_t frameP,
 		      msg4_padding, msg4_post_padding);
 		DevAssert(UE_id != UE_INDEX_INVALID);	// FIXME not sure how to gracefully return
 		// CHECK THIS: &cc[CC_idP].CCCH_pdu.payload[0]
-		offset = generate_dlsch_header((unsigned char *) mac->UE_list.DLSCH_pdu[CC_idP][0][(unsigned char) UE_id].payload[0], 1,	//num_sdus
+		int num_sdus = rrc_sdu_length > 0 ? 1 : 0;							       
+		offset = generate_dlsch_header((unsigned char *) mac->UE_list.DLSCH_pdu[CC_idP][0][(unsigned char) UE_id].payload[0], 
+							       num_sdus,	//num_sdus
 					       (unsigned short *) &rrc_sdu_length,	//
 					       &lcid,	// sdu_lcid
 					       255,	// no drx

openair3/SCTP/sctp_eNB_task.c

@@ -838,6 +838,7 @@ void *sctp_eNB_task(void *arg)
       break;
 
       case SCTP_DATA_REQ: {
+	printf("SCTP: Sending message via SCTP\n");
         sctp_send_data(ITTI_MESSAGE_GET_INSTANCE(received_msg),
                        ITTI_MSG_ORIGIN_ID(received_msg),
                        &received_msg->ittiMsg.sctp_data_req);