Fixed bug related to N_TA_offset not being applied at UE

  - By default this value is equal to 0 at gNB in case of ulsim, but
    has a value in case of RF simulator
  - The N_TA_offset was calculated but not used at UE side

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -537,21 +537,51 @@ uint8_t nr_ue_pusch_common_procedures(PHY_VARS_NR_UE *UE,
   txdata = UE->common_vars.txdata;
   txdataF = UE->common_vars.txdataF;
 
+  if(UE->N_TA_offset > tx_offset) {
+    int32_t *tmp_idft_out = (int32_t*)malloc16(frame_parms->get_samples_per_slot(slot, frame_parms) * sizeof(int32_t));
+
+    for(ap = 0; ap < Nl; ap++) {
+      if (frame_parms->Ncp == 1) { // extended cyclic prefix
+        PHY_ofdm_mod(txdataF[ap],
+                     tmp_idft_out,
+                     frame_parms->ofdm_symbol_size,
+                     12,
+                     frame_parms->nb_prefix_samples,
+                     CYCLIC_PREFIX);
+      } else { // normal cyclic prefix
+        nr_normal_prefix_mod(txdataF[ap],
+                             tmp_idft_out,
+                             14,
+                             frame_parms);
+      }
+
+      memcpy((void *) &txdata[ap][frame_parms->samples_per_frame - UE->N_TA_offset + tx_offset],
+             (void *) tmp_idft_out,
+             (UE->N_TA_offset - tx_offset) * sizeof(int32_t));
+
+      memcpy((void *) &txdata[ap][0],
+             (void *) &tmp_idft_out[UE->N_TA_offset - tx_offset],
+             (frame_parms->get_samples_per_slot(slot, frame_parms) - UE->N_TA_offset + tx_offset) * sizeof(int32_t));
+    }
+
+    free(tmp_idft_out);
+  } else { // UE->N_TA_offset <= tx_offset
     for (ap = 0; ap < Nl; ap++) {
       if (frame_parms->Ncp == 1) { // extended cyclic prefix
         PHY_ofdm_mod(txdataF[ap],
-         &txdata[ap][tx_offset],
+                     &txdata[ap][tx_offset-UE->N_TA_offset],
                      frame_parms->ofdm_symbol_size,
                      12,
                      frame_parms->nb_prefix_samples,
                      CYCLIC_PREFIX);
       } else { // normal cyclic prefix
         nr_normal_prefix_mod(txdataF[ap],
-           &txdata[ap][tx_offset],
+                             &txdata[ap][tx_offset-UE->N_TA_offset],
                              14,
                              frame_parms);
       }
     }
+  }
 
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