DL Post processor: distinguish tx/retx

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -573,6 +573,8 @@ void nr_schedule_ue_spec(module_id_t module_id,
     if (sched_ctrl->rbSize <= 0 && !get_softmodem_params()->phy_test)
       continue;
 
+    const rnti_t rnti = UE_info->rnti[UE_id];
+
     /* POST processing */
     struct NR_PDSCH_TimeDomainResourceAllocationList *tdaList =
       sched_ctrl->active_bwp->bwp_Common->pdsch_ConfigCommon->choice.setup->pdsch_TimeDomainAllocationList;
@@ -600,110 +602,12 @@ void nr_schedule_ue_spec(module_id_t module_id,
                        1 /* nrOfLayers */)
         >> 3;
 
-    /* Get RLC data TODO: remove random data retrieval */
-    int header_length_total = 0;
-    int header_length_last = 0;
-    int sdu_length_total = 0;
-    int num_sdus = 0;
-    uint16_t sdu_lengths[NB_RB_MAX] = {0};
-    uint8_t mac_sdus[MAX_NR_DLSCH_PAYLOAD_BYTES];
-    unsigned char sdu_lcids[NB_RB_MAX] = {0};
-    const rnti_t rnti = UE_info->rnti[UE_id];
-    const int lcid = DL_SCH_LCID_DTCH;
-    if (sched_ctrl->num_total_bytes > 0) {
-      LOG_D(MAC,
-            "[gNB %d][USER-PLANE DEFAULT DRB] Frame %d : DTCH->DLSCH, Requesting "
-            "%d bytes from RLC (lcid %d total hdr len %d), TBS: %d \n \n",
-            module_id,
-            frame,
-            TBS - ta_len - header_length_total - sdu_length_total - 3,
-            lcid,
-            header_length_total,
-            TBS);
-
-      sdu_lengths[num_sdus] = mac_rlc_data_req(module_id,
-          rnti,
-          module_id,
-          frame,
-          ENB_FLAG_YES,
-          MBMS_FLAG_NO,
-          lcid,
-          TBS - ta_len - header_length_total - sdu_length_total - 3,
-          (char *)&mac_sdus[sdu_length_total],
-          0,
-          0);
-
-      LOG_D(MAC,
-            "[gNB %d][USER-PLANE DEFAULT DRB] Got %d bytes for DTCH %d \n",
-            module_id,
-            sdu_lengths[num_sdus],
-            lcid);
-
-      sdu_lcids[num_sdus] = lcid;
-      sdu_length_total += sdu_lengths[num_sdus];
-      header_length_last = 1 + 1 + (sdu_lengths[num_sdus] >= 128);
-      header_length_total += header_length_last;
-
-      num_sdus++;
-
-      //ue_sched_ctl->uplane_inactivity_timer = 0;
-    }
-    else if (get_softmodem_params()->phy_test) {
-      LOG_D(MAC, "Configuring DL_TX in %d.%d: random data\n", frame, slot);
-      // fill dlsch_buffer with random data
-      for (int i = 0; i < TBS; i++)
-        mac_sdus[i] = (unsigned char) (lrand48()&0xff);
-      sdu_lcids[0] = 0x3f; // DRB
-      sdu_lengths[0] = TBS - ta_len - 3;
-      header_length_total += 2 + (sdu_lengths[0] >= 128);
-      sdu_length_total += sdu_lengths[0];
-      num_sdus +=1;
-    }
-
-    // there is at least one SDU or TA command
-    // if (num_sdus > 0 ){
-    if (ta_len + sdu_length_total + header_length_total == 0) {
-      // There is no data from RLC or MAC header, so don't schedule
-      return;
-    }
-
-    // Check if there is data from RLC or CE
-    const int post_padding = TBS >= 2 + header_length_total + sdu_length_total + ta_len;
-    // padding param currently not in use
-    //padding = TBS - header_length_total - sdu_length_total - ta_len - 1;
-
-    const int offset = nr_generate_dlsch_pdu(
-        module_id,
-        (unsigned char *)mac_sdus,
-        (unsigned char *)gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0],
-        num_sdus, // num_sdus
-        sdu_lengths,
-        sdu_lcids,
-        255, // no drx
-        NULL, // contention res id
-        post_padding);
-
-    // Padding: fill remainder of DLSCH with 0
-    if (post_padding > 0) {
-      for (int j = 0; j < TBS - offset; j++)
-        gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0][offset + j] = 0;
-    }
-
     const int current_harq_pid = sched_ctrl->current_harq_pid;
     NR_UE_harq_t *harq = &sched_ctrl->harq_processes[current_harq_pid];
     NR_sched_pucch *pucch = &sched_ctrl->sched_pucch[sched_ctrl->pucch_sched_idx];
     harq->feedback_slot = pucch->ul_slot;
     harq->is_waiting = 1;
     UE_info->mac_stats[UE_id].dlsch_rounds[harq->round]++;
-    if (harq->round == 0)
-      UE_info->mac_stats[UE_id].dlsch_total_bytes += TBS;
-
-    NR_UE_ret_info_t *retInfo = &sched_ctrl->retInfo[current_harq_pid];
-    retInfo->rbSize = sched_ctrl->rbSize;
-    retInfo->time_domain_allocation = sched_ctrl->time_domain_allocation;
-    retInfo->mcsTableIdx = sched_ctrl->mcsTableIdx;
-    retInfo->mcs = sched_ctrl->mcs;
-    retInfo->numDmrsCdmGrpsNoData = sched_ctrl->numDmrsCdmGrpsNoData;
 
     nfapi_nr_dl_tti_request_body_t *dl_req = &gNB_mac->DL_req[CC_id].dl_tti_request_body;
     nr_fill_nfapi_dl_pdu(module_id,
@@ -732,26 +636,152 @@ void nr_schedule_ue_spec(module_id_t module_id,
                          harq->ndi,
                          harq->round);
 
-    nfapi_nr_pdu_t *tx_req = &gNB_mac->TX_req[CC_id].pdu_list[gNB_mac->TX_req[CC_id].Number_of_PDUs];
-    configure_fapi_dl_Tx(module_id,
-                         frame,
-                         slot,
-                         dl_req,
-                         tx_req,
-                         TBS,
-                         gNB_mac->pdu_index[CC_id]);
+    NR_UE_ret_info_t *retInfo = &sched_ctrl->retInfo[current_harq_pid];
+    if (harq->round != 0) { /* retransmission */
+      if (sched_ctrl->rbSize != retInfo->rbSize)
+        LOG_W(MAC,
+              "retransmission uses different rbSize (%d vs. orig %d)\n",
+              sched_ctrl->rbSize,
+              retInfo->rbSize);
+      if (sched_ctrl->time_domain_allocation != retInfo->time_domain_allocation)
+        LOG_W(MAC,
+              "retransmission uses different time_domain_allocation (%d vs. orig %d)\n",
+              sched_ctrl->time_domain_allocation,
+              retInfo->time_domain_allocation);
+      if (sched_ctrl->mcs != retInfo->mcs
+          || sched_ctrl->mcsTableIdx != retInfo->mcsTableIdx
+          || sched_ctrl->numDmrsCdmGrpsNoData != retInfo->numDmrsCdmGrpsNoData)
+        LOG_W(MAC,
+              "retransmission uses different table/MCS/numDmrsCdmGrpsNoData (%d/%d/%d vs. orig %d/%d/%d)\n",
+              sched_ctrl->mcsTableIdx,
+              sched_ctrl->mcs,
+              sched_ctrl->numDmrsCdmGrpsNoData,
+              retInfo->mcsTableIdx,
+              retInfo->mcs,
+              retInfo->numDmrsCdmGrpsNoData);
+      /* we do not have to do anything, since we do not require to get data
+       * from RLC, encode MAC CEs, or copy data to FAPI structures */
+      LOG_W(MAC, "%d.%2d retransmission UE %d/RNTI %04x\n", frame, slot, UE_id, rnti);
+    } else { /* initial transmission */
+      /* Get RLC data TODO: remove random data retrieval */
+      int header_length_total = 0;
+      int header_length_last = 0;
+      int sdu_length_total = 0;
+      int num_sdus = 0;
+      uint16_t sdu_lengths[NB_RB_MAX] = {0};
+      uint8_t mac_sdus[MAX_NR_DLSCH_PAYLOAD_BYTES];
+      unsigned char sdu_lcids[NB_RB_MAX] = {0};
+      const int lcid = DL_SCH_LCID_DTCH;
+      if (sched_ctrl->num_total_bytes > 0) {
+        LOG_D(MAC,
+              "[gNB %d][USER-PLANE DEFAULT DRB] Frame %d : DTCH->DLSCH, Requesting "
+              "%d bytes from RLC (lcid %d total hdr len %d), TBS: %d \n \n",
+              module_id,
+              frame,
+              TBS - ta_len - header_length_total - sdu_length_total - 3,
+              lcid,
+              header_length_total,
+              TBS);
+
+        sdu_lengths[num_sdus] = mac_rlc_data_req(module_id,
+            rnti,
+            module_id,
+            frame,
+            ENB_FLAG_YES,
+            MBMS_FLAG_NO,
+            lcid,
+            TBS - ta_len - header_length_total - sdu_length_total - 3,
+            (char *)&mac_sdus[sdu_length_total],
+            0,
+            0);
+
+        LOG_D(MAC,
+              "[gNB %d][USER-PLANE DEFAULT DRB] Got %d bytes for DTCH %d \n",
+              module_id,
+              sdu_lengths[num_sdus],
+              lcid);
+
+        sdu_lcids[num_sdus] = lcid;
+        sdu_length_total += sdu_lengths[num_sdus];
+        header_length_last = 1 + 1 + (sdu_lengths[num_sdus] >= 128);
+        header_length_total += header_length_last;
+
+        num_sdus++;
+
+        //ue_sched_ctl->uplane_inactivity_timer = 0;
+      }
+      else if (get_softmodem_params()->phy_test) {
+        LOG_D(MAC, "Configuring DL_TX in %d.%d: random data\n", frame, slot);
+        // fill dlsch_buffer with random data
+        for (int i = 0; i < TBS; i++)
+          mac_sdus[i] = (unsigned char) (lrand48()&0xff);
+        sdu_lcids[0] = 0x3f; // DRB
+        sdu_lengths[0] = TBS - ta_len - 3;
+        header_length_total += 2 + (sdu_lengths[0] >= 128);
+        sdu_length_total += sdu_lengths[0];
+        num_sdus +=1;
+      }
+
+      // there is at least one SDU or TA command
+      // if (num_sdus > 0 ){
+      if (ta_len + sdu_length_total + header_length_total == 0) {
+        // There is no data from RLC or MAC header, so don't schedule
+        return;
+      }
+
+      // Check if there is data from RLC or CE
+      const int post_padding = TBS >= 2 + header_length_total + sdu_length_total + ta_len;
+      // padding param currently not in use
+      //padding = TBS - header_length_total - sdu_length_total - ta_len - 1;
+
+      const int offset = nr_generate_dlsch_pdu(
+          module_id,
+          (unsigned char *)mac_sdus,
+          (unsigned char *)gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0],
+          num_sdus, // num_sdus
+          sdu_lengths,
+          sdu_lcids,
+          255, // no drx
+          NULL, // contention res id
+          post_padding);
+
+      // Padding: fill remainder of DLSCH with 0
+      if (post_padding > 0) {
+        for (int j = 0; j < TBS - offset; j++)
+          gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0][offset + j] = 0;
+      }
+
+      UE_info->mac_stats[UE_id].dlsch_total_bytes += TBS;
+
+      retInfo->rbSize = sched_ctrl->rbSize;
+      retInfo->time_domain_allocation = sched_ctrl->time_domain_allocation;
+      retInfo->mcsTableIdx = sched_ctrl->mcsTableIdx;
+      retInfo->mcs = sched_ctrl->mcs;
+      retInfo->numDmrsCdmGrpsNoData = sched_ctrl->numDmrsCdmGrpsNoData;
+
+      nfapi_nr_pdu_t *tx_req = &gNB_mac->TX_req[CC_id].pdu_list[gNB_mac->TX_req[CC_id].Number_of_PDUs];
+      configure_fapi_dl_Tx(module_id,
+                           frame,
+                           slot,
+                           dl_req,
+                           tx_req,
+                           TBS,
+                           gNB_mac->pdu_index[CC_id]);
 
 #if defined(ENABLE_MAC_PAYLOAD_DEBUG)
-    if (frame%100 == 0){
-      LOG_I(MAC,
-            "%d.%d, first 10 payload bytes, TBS size: %d \n",
-            frame,
-            slot,
-            TBS);
-      for(int i = 0; i < 10; i++) {
-        LOG_I(MAC, "byte %d : %x\n", i,((uint8_t *)gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0])[i]);
+      if (frame%100 == 0) {
+        LOG_I(MAC,
+              "%d.%d, first 10 payload bytes, TBS size: %d \n",
+              frame,
+              slot,
+              TBS);
+        for(int i = 0; i < 10; i++)
+          LOG_I(MAC,
+                "byte %d: %x\n",
+                i,
+                ((uint8_t *)gNB_mac->UE_info.DLSCH_pdu[0][0].payload[0])[i]);
       }
-    }
 #endif
     }
+  }
 }