add option for limited buffer rate-matching for UL

nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h

@@ -333,6 +333,7 @@ typedef struct
   //Resource Allocation in time domain
   uint8_t  start_symbol_index;
   uint8_t  nr_of_symbols;
+  uint32_t tbslbrm;
   //Optional Data only included if indicated in pduBitmap
   nfapi_nr_ue_pusch_data_t pusch_data;
   nfapi_nr_ue_pusch_uci_t  pusch_uci;

openair1/PHY/CODING/nr_rate_matching.c

@@ -497,10 +497,10 @@ int nr_rate_matching_ldpc_rx(uint32_t Tbslbrm,
   N = (BG==1)?(66*Z):(50*Z);
 
   if (Tbslbrm == 0)
-      Ncb = N;
+    Ncb = N;
   else {
-      Nref = (3*Tbslbrm/(2*C)); //R_LBRM = 2/3
-      Ncb = min(N, Nref);
+    Nref = (3*Tbslbrm/(2*C)); //R_LBRM = 2/3
+    Ncb = min(N, Nref);
   }
 
   ind = (index_k0[BG-1][rvidx]*Ncb/N)*Z;
@@ -564,7 +564,6 @@ int nr_rate_matching_ldpc_rx(uint32_t Tbslbrm,
     }
   }
 
-
   return 0;
 }
 

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_coding.c

@@ -381,7 +381,7 @@ int nr_ulsch_encoding(PHY_VARS_NR_UE *ue,
 
     VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_NR_RATE_MATCHING_LDPC, VCD_FUNCTION_IN);
     start_meas(&ue->ulsch_rate_matching_stats);
-    if (nr_rate_matching_ldpc(0,
+    if (nr_rate_matching_ldpc(harq_process->pusch_pdu.tbslbrm,
                               harq_process->BG,
                               *pz,
                               harq_process->d[r],

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -302,7 +302,6 @@ int main(int argc, char **argv)
   //unsigned char frame_type = 0;
   NR_DL_FRAME_PARMS *frame_parms;
   int loglvl = OAILOG_WARNING;
-  //uint64_t SSB_positions=0x01;
   uint16_t nb_symb_sch = 12;
   int start_symbol = 0;
   uint16_t nb_rb = 50;
@@ -337,6 +336,7 @@ int main(int argc, char **argv)
   uint8_t transform_precoding = transformPrecoder_disabled; // 0 - ENABLE, 1 - DISABLE
   uint8_t num_dmrs_cdm_grps_no_data = 1;
   uint8_t mcs_table = 0;
+  int ilbrm = 0;
 
   UE_nr_rxtx_proc_t UE_proc;
   FILE *scg_fd=NULL;
@@ -375,6 +375,7 @@ int main(int argc, char **argv)
       nb_symb_sch = atoi(optarg);
       AssertFatal(nb_symb_sch > 0 && nb_symb_sch < 15,"start_symbol %d is not in 1..14\n",nb_symb_sch);
       break;
+
     case 'c':
       n_rnti = atoi(optarg);
       AssertFatal(n_rnti > 0 && n_rnti<=65535,"Illegal n_rnti %x\n",n_rnti);
@@ -476,7 +477,7 @@ int main(int argc, char **argv)
     case 'n':
       n_trials = atoi(optarg);
       break;
-      
+
     case 'p':
       extended_prefix_flag = 1;
       break;
@@ -561,7 +562,7 @@ int main(int argc, char **argv)
       break;
 
     case 'M':
-     // SSB_positions = atoi(optarg);
+      ilbrm = atoi(optarg);
       break;
       
     case 'N':
@@ -628,7 +629,6 @@ int main(int argc, char **argv)
       printf("-n Number of trials to simulate\n");
       printf("-p Use extended prefix mode\n");
       printf("-q MCS table\n");
-      printf("-t Delay spread for multipath channel\n");
       printf("-u Set the numerology\n");
       printf("-w Start PRB for PUSCH\n");
       //printf("-x Transmission mode (1,2,6 for the moment)\n");
@@ -640,7 +640,7 @@ int main(int argc, char **argv)
       printf("-G Offset of samples to read from file (0 default)\n");
       printf("-L <log level, 0(errors), 1(warning), 2(info) 3(debug) 4 (trace)>\n");
       printf("-I Maximum LDPC decoder iterations\n");
-      printf("-M Multiple SSB positions in burst\n");
+      printf("-M Use limited buffer rate-matching\n");
       printf("-N Nid_cell\n");
       printf("-O oversampling factor (1,2,4,8,16)\n");
       printf("-R N_RB_DL\n");
@@ -922,6 +922,12 @@ int main(int argc, char **argv)
   printf("num dmrs sym %d\n",number_dmrs_symbols);
   uint8_t  nb_re_dmrs          = (dmrs_config_type == pusch_dmrs_type1) ? 6 : 4;
 
+  uint32_t tbslbrm = 0;
+  if (ilbrm)
+    tbslbrm = nr_compute_tbslbrm(mcs_table,
+                                 N_RB_UL,
+                                 precod_nbr_layers);
+
   if ((UE->frame_parms.nb_antennas_tx==4)&&(precod_nbr_layers==4))
     num_dmrs_cdm_grps_no_data = 2;
 
@@ -1150,6 +1156,7 @@ int main(int argc, char **argv)
       pusch_pdu->uplink_frequency_shift_7p5khz = 0;
       pusch_pdu->start_symbol_index = start_symbol;
       pusch_pdu->nr_of_symbols = nb_symb_sch;
+      pusch_pdu->maintenance_parms_v3.tbSizeLbrmBytes = tbslbrm;
       pusch_pdu->pusch_data.rv_index = rv_index;
       pusch_pdu->pusch_data.harq_process_id = 0;
       pusch_pdu->pusch_data.new_data_indicator = trial & 0x1;
@@ -1210,6 +1217,7 @@ int main(int argc, char **argv)
       ul_config.ul_config_list[0].pusch_config_pdu.dmrs_ports = ((1<<precod_nbr_layers)-1);
       ul_config.ul_config_list[0].pusch_config_pdu.absolute_delta_PUSCH = 0;
       ul_config.ul_config_list[0].pusch_config_pdu.target_code_rate = code_rate;
+      ul_config.ul_config_list[0].pusch_config_pdu.tbslbrm = tbslbrm;
 
       ul_config.ul_config_list[0].pusch_config_pdu.pusch_data.tb_size = TBS/8;
       ul_config.ul_config_list[0].pusch_config_pdu.pusch_data.new_data_indicator = trial & 0x1;

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -4129,18 +4129,33 @@ uint16_t compute_pucch_prb_size(uint8_t format,
 }
 
 int get_bw_tbslbrm(int scc_bwpsize,
+                   bool is_dl,
                    NR_CellGroupConfig_t *cg) {
 
   int bw = scc_bwpsize;
   if (cg && cg->spCellConfig && cg->spCellConfig->spCellConfigDedicated) {
     const NR_ServingCellConfig_t *servingCellConfig = cg->spCellConfig->spCellConfigDedicated;
-    if(servingCellConfig->downlinkBWP_ToAddModList) {
-      struct NR_ServingCellConfig__downlinkBWP_ToAddModList *BWP_list = servingCellConfig->downlinkBWP_ToAddModList;
-      for (int i=0; i<BWP_list->list.count; i++) {
-        NR_BWP_t genericParameters = BWP_list->list.array[i]->bwp_Common->genericParameters;
-        int curr_bw = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-        if (curr_bw > bw)
-          bw = curr_bw;
+    if(is_dl) {
+      if(servingCellConfig->downlinkBWP_ToAddModList) {
+        const struct NR_ServingCellConfig__downlinkBWP_ToAddModList *BWP_list = servingCellConfig->downlinkBWP_ToAddModList;
+        for (int i=0; i<BWP_list->list.count; i++) {
+          NR_BWP_t genericParameters = BWP_list->list.array[i]->bwp_Common->genericParameters;
+          int curr_bw = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
+          if (curr_bw > bw)
+            bw = curr_bw;
+        }
+      }
+    }
+    else {
+      if (servingCellConfig->uplinkConfig &&
+          servingCellConfig->uplinkConfig->uplinkBWP_ToAddModList) {
+        const struct NR_UplinkConfig__uplinkBWP_ToAddModList *BWP_list = servingCellConfig->uplinkConfig->uplinkBWP_ToAddModList;
+        for (int i=0; i<BWP_list->list.count; i++) {
+          NR_BWP_t genericParameters = BWP_list->list.array[i]->bwp_Common->genericParameters;
+          int curr_bw = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
+          if (curr_bw > bw)
+            bw = curr_bw;
+        }
       }
     }
   }
@@ -4738,4 +4753,4 @@ uint16_t nr_get_csi_bitlen(nr_csi_report_t *csi_report_template, uint8_t csi_rep
   }
 
   return csi_bitlen;
-}
\ No newline at end of file
+}

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.h

@@ -143,6 +143,7 @@ uint32_t nr_get_code_rate_ul(uint8_t Imcs, uint8_t table_idx);
 uint16_t get_nr_srs_offset(NR_SRS_PeriodicityAndOffset_t periodicityAndOffset);
 
 int get_bw_tbslbrm(int scc_bwpsize,
+                   bool is_dl,
                    NR_CellGroupConfig_t *cg);
 
 uint32_t nr_compute_tbslbrm(uint16_t table,

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -965,13 +965,13 @@ int8_t nr_ue_process_dci(module_id_t module_id, int cc_id, uint8_t gNB_index, fr
       NR_BWP_t genericParameters = mac->scc ? mac->scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters :
                                               mac->scc_SIB->downlinkConfigCommon.initialDownlinkBWP.genericParameters;
       int BWPSize = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-      bw_tbslbrm = get_bw_tbslbrm(BWPSize, mac->cg);
+      bw_tbslbrm = get_bw_tbslbrm(BWPSize, true, mac->cg);
     }
     else
       bw_tbslbrm = dlsch_config_pdu_1_0->BWPSize;
     dlsch_config_pdu_1_0->tbslbrm = nr_compute_tbslbrm(dlsch_config_pdu_1_0->mcs_table,
-			                               bw_tbslbrm,
-		                                       1);
+                                                       bw_tbslbrm,
+                                                       1);
 
     /* NDI (only if CRC scrambled by C-RNTI or CS-RNTI or new-RNTI or TC-RNTI)*/
     dlsch_config_pdu_1_0->ndi = dci->ndi;
@@ -1406,7 +1406,7 @@ int8_t nr_ue_process_dci(module_id_t module_id, int cc_id, uint8_t gNB_index, fr
     NR_BWP_t genericParameters = mac->scc ? mac->scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters :
                                             mac->scc_SIB->downlinkConfigCommon.initialDownlinkBWP.genericParameters;
     int BWPSize = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-    int bw_tbslbrm = get_bw_tbslbrm(BWPSize, mac->cg);
+    int bw_tbslbrm = get_bw_tbslbrm(BWPSize, true, mac->cg);
     dlsch_config_pdu_1_1->tbslbrm = nr_compute_tbslbrm(dlsch_config_pdu_1_1->mcs_table,
 			                               bw_tbslbrm,
 		                                       nl_tbslbrm);

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

@@ -681,6 +681,7 @@ int nr_config_pusch_pdu(NR_UE_MAC_INST_t *mac,
     pusch_config_pdu->pusch_data.harq_process_id = 0;
     pusch_config_pdu->pusch_data.new_data_indicator = 1; // new data
     pusch_config_pdu->pusch_data.num_cb = 0;
+    pusch_config_pdu->tbslbrm = 0;
 
   } else if (dci) {
     NR_BWP_Id_t dl_bwp_id = mac->DL_BWP_Id;
@@ -863,6 +864,31 @@ int nr_config_pusch_pdu(NR_UE_MAC_INST_t *mac,
 
     else N_PRB_oh = 0;
 
+    if (mac->cg &&
+        mac->cg->spCellConfig &&
+        mac->cg->spCellConfig->spCellConfigDedicated &&
+        mac->cg->spCellConfig->spCellConfigDedicated->uplinkConfig &&
+        mac->cg->spCellConfig->spCellConfigDedicated->uplinkConfig->pusch_ServingCellConfig &&
+        mac->cg->spCellConfig->spCellConfigDedicated->uplinkConfig->pusch_ServingCellConfig->choice.setup->rateMatching) {
+      long *maxMIMO_Layers = mac->cg->spCellConfig->spCellConfigDedicated->uplinkConfig->pusch_ServingCellConfig->choice.setup->ext1->maxMIMO_Layers;
+      if (!maxMIMO_Layers)
+        maxMIMO_Layers = pusch_Config ? pusch_Config->maxRank : NULL;
+      AssertFatal (maxMIMO_Layers != NULL,"Option with max MIMO layers not configured is not supported\n");
+      int bw_tbslbrm;
+      if (mac->scc || mac->scc_SIB || mac->cg) {
+        NR_BWP_t genericParameters = initialUplinkBWP->genericParameters;
+        int BWPSize = NRRIV2BW(genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
+        bw_tbslbrm = get_bw_tbslbrm(BWPSize, false, mac->cg);
+      }
+      else
+        bw_tbslbrm = pusch_config_pdu->bwp_size;
+      pusch_config_pdu->tbslbrm = nr_compute_tbslbrm(pusch_config_pdu->mcs_table,
+                                                     bw_tbslbrm,
+                                                     *maxMIMO_Layers);
+    }
+    else
+      pusch_config_pdu->tbslbrm = 0;
+
     /* PTRS */
     if (ul_bwp_id > 0 &&
         mac->ULbwp[ul_bwp_id-1] &&

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

@@ -1318,7 +1318,7 @@ void nr_generate_Msg2(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
     }
 
     int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, ra->CellGroup);
+    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, true, ra->CellGroup);
     pdsch_pdu_rel15->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(mcsTableIdx,
                                                                                bw_tbslbrm,
                                                                                1);
@@ -1699,7 +1699,7 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
     nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu, x_Overhead, pdsch_pdu_rel15->numDmrsCdmGrpsNoData, tb_scaling);
 
     int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, ra->CellGroup);
+    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, true, ra->CellGroup);
     pdsch_pdu_rel15->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(mcsTableIdx,
                                                                                bw_tbslbrm,
                                                                                1);

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -1056,7 +1056,7 @@ void nr_schedule_ue_spec(module_id_t module_id,
     int nl_tbslbrm = *maxMIMO_Layers < 4 ? *maxMIMO_Layers : 4;
     // Maximum number of PRBs across all configured DL BWPs
     int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
-    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, cg);
+    int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, true, cg);
     pdsch_pdu->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(current_BWP->mcsTableIdx,
                                                                          bw_tbslbrm,
                                                                          nl_tbslbrm);

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -2217,7 +2217,10 @@ void configure_UE_BWP(gNB_MAC_INST *nr_mac,
       CellGroup->spCellConfig->spCellConfigDedicated) {
 
     const NR_ServingCellConfig_t *servingCellConfig = CellGroup->spCellConfig->spCellConfigDedicated;
-    DL_BWP->pdsch_servingcellconfig = servingCellConfig->pdsch_ServingCellConfig? servingCellConfig->pdsch_ServingCellConfig->choice.setup : NULL;
+    DL_BWP->pdsch_servingcellconfig = servingCellConfig->pdsch_ServingCellConfig ? servingCellConfig->pdsch_ServingCellConfig->choice.setup : NULL;
+    UL_BWP->pusch_servingcellconfig = servingCellConfig->uplinkConfig ?
+                                      (servingCellConfig->uplinkConfig->pusch_ServingCellConfig ? servingCellConfig->uplinkConfig->pusch_ServingCellConfig->choice.setup : NULL ) :
+                                      NULL;
     target_ss = NR_SearchSpace__searchSpaceType_PR_ue_Specific;
 
     if(UE && UE->Msg3_dcch_dtch) {

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c

@@ -1683,7 +1683,21 @@ void nr_schedule_ulsch(module_id_t module_id, frame_t frame, sub_frame_t slot)
     pusch_pdu->pusch_data.tb_size = sched_pusch->tb_size;
     pusch_pdu->pusch_data.num_cb = 0; //CBG not supported
 
-    pusch_pdu->maintenance_parms_v3.tbSizeLbrmBytes = 0;
+    if(current_BWP->pusch_servingcellconfig &&
+       current_BWP->pusch_servingcellconfig->rateMatching) {
+      // TBS_LBRM according to section 5.4.2.1 of 38.212
+      long *maxMIMO_Layers = current_BWP->pusch_servingcellconfig->ext1->maxMIMO_Layers;
+      if (!maxMIMO_Layers)
+        maxMIMO_Layers = current_BWP->pusch_Config->maxRank;
+      AssertFatal (maxMIMO_Layers != NULL,"Option with max MIMO layers not configured is not supported\n");
+      const int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
+      int bw_tbslbrm = get_bw_tbslbrm(scc_bwpsize, false, cg);
+      pusch_pdu->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(current_BWP->mcs_table,
+                                                                           bw_tbslbrm,
+                                                                           *maxMIMO_Layers);
+    }
+    else
+     pusch_pdu->maintenance_parms_v3.tbSizeLbrmBytes = 0;
 
     LOG_D(NR_MAC,"PUSCH PDU : data_scrambling_identity %x, dmrs_scrambling_id %x\n",pusch_pdu->data_scrambling_id,pusch_pdu->ul_dmrs_scrambling_id);
     /* TRANSFORM PRECODING --------------------------------------------------------*/

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -113,6 +113,7 @@ typedef struct NR_UE_UL_BWP {
   long *cyclicprefix;
   uint16_t BWPSize;
   uint16_t BWPStart;
+  NR_PUSCH_ServingCellConfig_t *pusch_servingcellconfig;
   NR_PUSCH_TimeDomainResourceAllocationList_t *tdaList;
   NR_PUSCH_Config_t *pusch_Config;
   NR_PUCCH_Config_t *pucch_Config;