RRU synchronization debugging

openair1/PHY/LTE_TRANSPORT/if4_tools.c

@@ -119,7 +119,7 @@ void send_IF4p5(PHY_VARS_eNB *eNB, int frame, int subframe, uint16_t packet_type
     gen_IF4p5_ul_header(packet_header, frame, subframe);
 
     for (symbol_id=0; symbol_id<fp->symbols_per_tti; symbol_id++) {			
-
+      LOG_I(PHY,"IF4p5_PULFFT: frame %d, subframe %d, symbol %d\n",frame,subframe,symbol_id);
       for (element_id=0; element_id<db_halflength; element_id++) {
         i = (uint16_t*) &rxdataF[0][blockoffsetF+element_id];
         data_block[element_id] = ((uint16_t) lin2alaw[*i]) | (lin2alaw[*(i+1)]<<8);
@@ -145,6 +145,7 @@ void send_IF4p5(PHY_VARS_eNB *eNB, int frame, int subframe, uint16_t packet_type
     }		
   } else if (packet_type == IF4p5_PRACH) {
     // FIX: hard coded prach samples length
+    LOG_I(PHY,"IF4p5_PRACH: frame %d, subframe %d\n",frame,subframe);
     db_fulllength = 840*2;
     if (eth->flags == ETH_RAW_IF4p5_MODE) {
       packet_header = (IF4p5_header_t *)(tx_buffer + MAC_HEADER_SIZE_BYTES);
@@ -229,11 +230,12 @@ void recv_IF4p5(PHY_VARS_eNB *eNB, int *frame, int *subframe, uint16_t *packet_t
 
   *packet_type = packet_header->sub_type; 
 
-  //  LOG_I(PHY,"CC_id %d : frame %d, subframe %d\n",eNB->CC_id,*frame,*subframe);
 
   if (*packet_type == IF4p5_PDLFFT) {          
     *symbol_number = ((packet_header->frame_status)>>26)&0x000f;         
 
+    LOG_I(PHY,"DL_IF4p5: CC_id %d : frame %d, subframe %d, symbol %d\n",eNB->CC_id,*frame,*subframe,*symbol_number);
+
     slotoffsetF = (*symbol_number)*(fp->ofdm_symbol_size) + (*subframe)*(fp->ofdm_symbol_size)*((fp->Ncp==1) ? 12 : 14) + 1;
     blockoffsetF = slotoffsetF + fp->ofdm_symbol_size - db_halflength - 1; 
         

openair1/PHY/defs.h

@@ -244,6 +244,10 @@ typedef struct eNB_proc_t_s {
   int subframe_prach;
   /// frame to act upon for reception
   int frame_rx;
+  /// frame to act upon for transmission
+  int frame_tx;
+  /// frame offset for secondary eNBs (to correct for frame asynchronism at startup)
+  int frame_offset;
   /// frame to act upon for PRACH
   int frame_prach;
   /// \internal This variable is protected by \ref mutex_fep.

targets/RT/USER/lte-enb.c

@@ -756,6 +756,7 @@ void fh_if4p5_asynch_DL(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
       *frame    = frame_tx;
       *subframe = subframe_tx;
       proc->first_tx = 0;
+      proc->frame_offset = frame_tx - proc->frame_tx;
     }
     else {
       if (frame_tx != *frame) {
@@ -779,6 +780,7 @@ void fh_if4p5_asynch_DL(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
 
   *frame = frame_tx;
 
+
   // intialize this to zero after we're done with the subframe
   proc->symbol_mask[*subframe] = 0;
   
@@ -906,6 +908,9 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
   }
   proc->frame_rx    = ((proc->timestamp_rx-eNB->ts_offset) / (fp->samples_per_tti*10))&1023;
   proc->subframe_rx = ((proc->timestamp_rx-eNB->ts_offset) / fp->samples_per_tti)%10;
+  proc->frame_rx    = (proc->frame_rx+proc->frame_offset)%1023;
+  proc->frame_tx    = proc->frame_rx;
+  if (proc->subframe_rx > 5) proc->frame_tx=(proc->frame_tx+1)%1023;
   // synchronize first reception to frame 0 subframe 0
 
   proc->timestamp_tx = proc->timestamp_rx+(4*fp->samples_per_tti);
@@ -916,8 +921,8 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
       LOG_E(PHY,"rx_rf: Received Timestamp (%llu) doesn't correspond to the time we think it is (proc->subframe_rx %d, subframe %d)\n",proc->timestamp_rx,proc->subframe_rx,*subframe);
       exit_fun("Exiting");
     }
-    
-    if (proc->frame_rx != *frame) {
+    int f2 = *frame+proc->frame_offset;    
+    if (proc->frame_rx != f2) {
       LOG_E(PHY,"rx_rf: Received Timestamp (%llu) doesn't correspond to the time we think it is (proc->frame_rx %d frame %d)\n",proc->timestamp_rx,proc->frame_rx,*frame);
       exit_fun("Exiting");
     }
@@ -1495,7 +1500,7 @@ static void* eNB_thread_single( void* param ) {
     proc_rxtx->subframe_rx = proc->subframe_rx;
     proc_rxtx->frame_rx    = proc->frame_rx;
     proc_rxtx->subframe_tx = (proc->subframe_rx+4)%10;
-    proc_rxtx->frame_tx    = (proc->subframe_rx < 6) ? proc->frame_rx : (proc->frame_rx+1)&1023; 
+    proc_rxtx->frame_tx    = proc->frame_tx;
     proc_rxtx->timestamp_tx = proc->timestamp_tx;
 
     // At this point, all information for subframe has been received on FH interface