tentative fix for wrong frame caused by rx offset

executables/nr-ue.c

@@ -513,7 +513,7 @@ void *UE_thread(void *arg) {
         if (UE->is_synchronized) {
           decoded_frame_rx=(((mac->mib->systemFrameNumber.buf[0] >> mac->mib->systemFrameNumber.bits_unused)<<4) | tmp->proc.decoded_frame_rx);
           // shift the frame index with all the frames we trashed meanwhile we perform the synch search
-          decoded_frame_rx=(decoded_frame_rx + (!UE->init_sync_frame) + trashed_frames) % MAX_FRAME_NUMBER;
+          decoded_frame_rx=(decoded_frame_rx + UE->init_sync_frame + trashed_frames) % MAX_FRAME_NUMBER;
         }
         delNotifiedFIFO_elt(res);
       } else {
@@ -652,9 +652,9 @@ void *UE_thread(void *arg) {
       pushNotifiedFIFO_nothreadSafe(&freeBlocks,res);
     }
 
-    if (  decoded_frame_rx>0 && decoded_frame_rx != curMsg->proc.frame_rx)
+    if (decoded_frame_rx>0 && decoded_frame_rx != curMsg->proc.frame_rx)
       LOG_E(PHY,"Decoded frame index (%d) is not compatible with current context (%d), UE should go back to synch mode\n",
-            decoded_frame_rx, curMsg->proc.frame_rx  );
+            decoded_frame_rx, curMsg->proc.frame_rx);
 
     // use previous timing_advance value to compute writeTimestamp
     writeTimestamp = timestamp+

openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c

@@ -308,12 +308,14 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc, PHY_VARS_NR_UE *ue, int n_frames)
         // every 7*(1<<mu) symbols there is a different prefix length (38.211 5.3.1)
         int n_symb_prefix0 = (ue->symbol_offset/(7*(1<<mu)))+1;
         sync_pos_frame = n_symb_prefix0*(fp->ofdm_symbol_size + fp->nb_prefix_samples0)+(ue->symbol_offset-n_symb_prefix0)*(fp->ofdm_symbol_size + fp->nb_prefix_samples);
-        if (ue->ssb_offset < sync_pos_frame)
-          ue->rx_offset = fp->samples_per_frame - sync_pos_frame + ue->ssb_offset;
-        else
+        if (ue->ssb_offset < sync_pos_frame){
+          ue->rx_offset = (2*fp->samples_per_frame) - sync_pos_frame + ue->ssb_offset;
+          ue->init_sync_frame = !is + 2;
+        }
+        else{
           ue->rx_offset = ue->ssb_offset - sync_pos_frame;
-
-        ue->init_sync_frame = is;
+          ue->init_sync_frame = !is;
+        }
       }   
 
     /*