fixing counter of trashed frames for two frames synchronization

executables/nr-ue.c

@@ -592,6 +592,10 @@ void *UE_thread(void *arg) {
       // and we shifted above to the first slot of next frame
       // the synch thread proc context is hard linked to regular processing thread context, thread id  = 0
       UE_nr_rxtx_proc_t *proc=&(((processingData_t *)NotifiedFifoData(processingMsg[0]))->proc);
+      // synchronization is on two frame basis
+      // if it succeeds on the first frame the second one needs to be considered as trashed
+      if(!UE->is_synchronized_on_frame)
+        trashed_frames++;
       // shift the frame index with all the frames we trashed meanwhile we perform the synch search
       proc->decoded_frame_rx=(proc->decoded_frame_rx + trashed_frames) % MAX_FRAME_NUMBER;
       decoded_frame_rx=proc->decoded_frame_rx;

openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c

@@ -208,6 +208,7 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc, PHY_VARS_NR_UE *ue, runmode_t mode)
   int32_t metric_tdd_ncp=0;
   uint8_t phase_tdd_ncp;
   double im, re;
+  int is;
 
   NR_DL_FRAME_PARMS *fp = &ue->frame_parms;
   int ret=-1;
@@ -242,7 +243,7 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc, PHY_VARS_NR_UE *ue, runmode_t mode)
    cnt =0;
 
    // initial sync performed on two successive frames, if pbch passes on first frame, no need to process second frame 
-   for(int is=0; is<2;is++) {
+   for(is=0; is<2;is++) {
 
     /* process pss search on received buffer */
     sync_pos = pss_synchro_nr(ue, is, NO_RATE_CHANGE);
@@ -372,6 +373,8 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc, PHY_VARS_NR_UE *ue, runmode_t mode)
 #endif
     //#endif
 
+    ue->is_synchronized_on_frame = is; // to notify on which of the two frames sync was successful
+
     if (ue->UE_scan_carrier == 0) {
 
     #if UE_AUTOTEST_TRACE

openair1/PHY/defs_nr_UE.h

@@ -878,8 +878,10 @@ typedef struct {
   int UE_scan_carrier;
   /// \brief Indicator that UE should enable estimation and compensation of frequency offset
   int UE_fo_compensation;
-  /// \brief Indicator that UE is synchronized to an eNB
+  /// \brief Indicator that UE is synchronized to a gNB
   int is_synchronized;
+  /// \brief Indicates on which frame is synchronized in a two frame synchronization
+  int is_synchronized_on_frame;
   /// Data structure for UE process scheduling
   UE_nr_proc_t proc;
   /// Flag to indicate the UE shouldn't do timing correction at all