Avoid decoding UL-CCCH with all zeros

openair2/LAYER2/MAC/eNB_scheduler_RA.c

@@ -1288,7 +1288,7 @@ initiate_ra_proc(module_id_t module_idP,
     prach_ParametersListCE_r13 = &ext4_prach->prach_ParametersListCE_r13;
   }
 
-  LOG_D(MAC,
+  LOG_I(MAC,
         "[eNB %d][RAPROC] CC_id %d Frame %d, Subframe %d  Initiating RA procedure for preamble index %d, timing offset %d\n",
         module_idP, CC_id, frameP, subframeP, preamble_index, timing_offset);
   LOG_D(MAC,

openair2/LAYER2/MAC/eNB_scheduler_ulsch.c

@@ -303,7 +303,17 @@ rx_sdu(const module_id_t enb_mod_idP,
 
     first_rb = ra->msg3_first_rb;
 
-    if (sduP == NULL) { // we've got an error on Msg3
+    bool no_sig = true;
+    if (sduP) {
+      for (int k = 0; k < sdu_lenP; k++) {
+        if(sduP[k]!=0) {
+          no_sig = false;
+          break;
+        }
+      }
+    }
+
+    if (no_sig || sduP == NULL) { // we've got an error on Msg3
       LOG_D(MAC, "[eNB %d] CC_id %d, RA %d ULSCH in error in round %d/%d\n",
             enb_mod_idP,
             CC_idP,
@@ -690,6 +700,19 @@ rx_sdu(const module_id_t enb_mod_idP,
           break;
         }
 
+        bool no_sig = true;
+        for (int k = 0; k < sdu_lenP; k++) {
+          if(sduP[k]!=0) {
+            no_sig = false;
+            break;
+          }
+        }
+
+        if(no_sig) {
+          LOG_W(MAC, "No signal\n");
+          break;
+        }
+
         LOG_D(MAC, "[eNB %d][RAPROC] CC_id %d Frame %d, Received CCCH:  %x.%x.%x.%x.%x.%x, Terminating RA procedure for UE rnti %x\n",
               enb_mod_idP,
               CC_idP,