do not process rar in case of nack

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -3560,6 +3560,12 @@ int nr_ue_process_rar(nr_downlink_indication_t *dl_info, NR_UL_TIME_ALIGNMENT_t
   module_id_t mod_id       = dl_info->module_id;
   frame_t frame            = dl_info->frame;
   int slot                 = dl_info->slot;
+
+  if(dl_info->rx_ind->rx_indication_body[pdu_id].pdsch_pdu.ack_nack == 0) {
+    LOG_W(NR_MAC,"[UE %d][RAPROC][%d.%d] CRC check failed on RAR (NAK)\n", mod_id, frame, slot);
+    return 0;
+  }
+
   int cc_id                = dl_info->cc_id;
   uint8_t gNB_id           = dl_info->gNB_index;
   NR_UE_MAC_INST_t *mac    = get_mac_inst(mod_id);