Change pseudo-subheader byte of random ULSCH PDU (phytest) to an appropriate value

- Apply a value which cannot be interpreted as any valid LCID at the MAC layer of the receiver gNB (as per 38.321 Table 6.2.1-2),
to avoid forwarding the random PDU to the upper layers in noS1 mode.

openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c

@@ -715,10 +715,10 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
 
 #ifdef DEBUG_ULSCH_DECODING
   LOG_I(PHY, "Decoder output (payload): \n");
-  for (i = 0; i < harq_process->TBS / 8; i++) {
+  for (i = 0; i < harq_process->TBS ; i++) {
 	  //harq_process_ul_ue->a[i] = (unsigned char) rand();
 	  //printf("a[%d]=0x%02x\n",i,harq_process_ul_ue->a[i]);
-	  printf("0x%02x",harq_process->b[i]);
+	  printf("%02x",harq_process->b[i]);
   }
 #endif
 

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -193,15 +193,14 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
       if (!IS_SOFTMODEM_NOS1 || !data_existing) {
         //Use zeros for the header bytes in noS1 mode, in order to make sure that the LCID is not valid
         //and block this traffic from being forwarded to the upper layers at the gNB
-        uint16_t payload_offset = 5;
         LOG_D(PHY, "Random data to be tranmsitted: \n");
 
-        //Give the header bytes a dummy value (a value not corresponding to any valid LCID based on 38.321, Table 6.2.1-2)
-        //in order to block the random packet at the MAC layer of the receiver
-        for (i = 0; i<payload_offset; i++)
-          harq_process_ul_ue->a[i] = 64;
+        //Give the first byte a dummy value (a value not corresponding to any valid LCID based on 38.321, Table 6.2.1-2)
+        //in order to distinguish the PHY random packets at the MAC layer of the gNB receiver from the normal packets that should
+        //have a valid LCID (nr_process_mac_pdu function)
+        harq_process_ul_ue->a[0] = 0x31;
 
-        for (i = payload_offset; i < harq_process_ul_ue->TBS / 8; i++) {
+        for (i = 1; i < harq_process_ul_ue->TBS / 8; i++) {
           harq_process_ul_ue->a[i] = (unsigned char) rand();
           //printf(" input encoder a[%d]=0x%02x\n",i,harq_process_ul_ue->a[i]);
         }