move computation of base graph for LDPC at MAC in the UE

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

@@ -348,6 +348,7 @@ typedef struct
   uint8_t  start_symbol_index;
   uint8_t  nr_of_symbols;
   uint32_t tbslbrm;
+  uint8_t ldpcBaseGraph;
   //Optional Data only included if indicated in pduBitmap
   nfapi_nr_ue_pusch_data_t pusch_data;
   nfapi_nr_ue_pusch_uci_t  pusch_uci;
@@ -491,6 +492,7 @@ typedef struct {
   uint16_t dlDmrsScramblingId;
   uint16_t pduBitmap;
   uint32_t k1_feedback;
+  uint8_t ldpcBaseGraph;
 } fapi_nr_dl_config_dlsch_pdu_rel15_t;
 
 typedef struct {

openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_decoding.c

@@ -44,7 +44,6 @@
 #include "executables/nr-uesoftmodem.h"
 #include "PHY/CODING/nrLDPC_extern.h"
 #include "common/utils/nr/nr_common.h"
-#include "openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.h"
 #include "openair1/PHY/TOOLS/phy_scope_interface.h"
 
 //#define ENABLE_PHY_PAYLOAD_DEBUG 1
@@ -348,7 +347,7 @@ uint32_t nr_dlsch_decoding(PHY_VARS_NR_UE *phy_vars_ue,
 
   LOG_D(PHY,"%d.%d DLSCH Decoding, harq_pid %d TBS %d (%d) G %d nb_re_dmrs %d length dmrs %d mcs %d Nl %d nb_symb_sch %d nb_rb %d Qm %d Coderate %f\n",
         frame,nr_slot_rx,harq_pid,A,A/8,G, nb_re_dmrs, dmrs_length, dlsch->dlsch_config.mcs, dlsch->Nl, nb_symb_sch, nb_rb, dlsch->dlsch_config.qamModOrder, Coderate);
-  decParams.BG = get_BG(A, dlsch->dlsch_config.targetCodeRate);
+  decParams.BG = dlsch->dlsch_config.ldpcBaseGraph;
   unsigned int kc = decParams.BG == 2 ? 52 : 68;
 
   if (harq_process->first_rx == 1) {

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_coding.c

@@ -122,11 +122,7 @@ int nr_ulsch_encoding(PHY_VARS_NR_UE *ue,
 ///////////////////////// b---->| block segmentation |---->c /////////////////////////
 ///////////
 
-    if ((A <= 292) || ((A <= NR_MAX_PDSCH_TBS) && (Coderate <= 0.6667)) || Coderate <= 0.25) {
-      harq_process->BG = 2;
-    } else {
-      harq_process->BG = 1;
-    }
+    harq_process->BG = ulsch->pusch_pdu.ldpcBaseGraph;
 
     VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_NR_SEGMENTATION, VCD_FUNCTION_IN);
     start_meas(&ue->ulsch_segmentation_stats);

openair1/SIMULATION/NR_PHY/dlschsim.c

@@ -483,6 +483,7 @@ int main(int argc, char **argv)
 	dlsch0_ue->dlsch_config.rv = rvidx;
 	dlsch0_ue->dlsch_config.targetCodeRate = rate;
   dlsch0_ue->dlsch_config.TBS = TBS;
+  dlsch0_ue->dlsch_config.ldpcBaseGraph = get_BG(TBS, rate);
 	dlsch0_ue->dlsch_config.dmrsConfigType = NFAPI_NR_DMRS_TYPE1;
 	dlsch0_ue->dlsch_config.dlDmrsSymbPos = 4;
 	dlsch0_ue->dlsch_config.n_dmrs_cdm_groups = 1;

openair1/SIMULATION/NR_PHY/ulschsim.c

@@ -506,6 +506,7 @@ int main(int argc, char **argv)
   ulsch_ue->pusch_pdu.pusch_data.tb_size  = TBS>>3;
   ulsch_ue->pusch_pdu.target_code_rate = code_rate;
   ulsch_ue->pusch_pdu.qam_mod_order = mod_order;
+  ulsch_ue->pusch_pdu.ldpcBaseGraph = get_BG(TBS, code_rate);
   unsigned char *test_input = harq_process_ul_ue->a;
 
   ///////////

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -1116,6 +1116,7 @@ int main(int argc, char *argv[])
         pusch_config_pdu->absolute_delta_PUSCH = 0;
         pusch_config_pdu->target_code_rate = code_rate;
         pusch_config_pdu->tbslbrm = tbslbrm;
+        pusch_config_pdu->ldpcBaseGraph = get_BG(TBS, code_rate);
         pusch_config_pdu->pusch_data.tb_size = TBS / 8;
         pusch_config_pdu->pusch_data.new_data_indicator = round == 0 ? true : false;
         pusch_config_pdu->pusch_data.rv_index = rv_index;

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -4075,8 +4075,8 @@ void csi_period_offset(NR_CSI_ReportConfig_t *csirep,
   }
 }
 
-uint8_t get_BG(uint32_t A, uint16_t R) {
-
+uint8_t get_BG(uint32_t A, uint16_t R)
+{
   float code_rate = (float) R / 10240.0f;
   if ((A <= 292) || ((A <= NR_MAX_PDSCH_TBS) && (code_rate <= 0.6667)) || code_rate <= 0.25)
     return 2;

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -736,6 +736,8 @@ static int nr_ue_process_dci_dl_10(module_id_t module_id,
     dlsch_pdu->TBS = current_harq->TBS;
   }
 
+  dlsch_pdu->ldpcBaseGraph = get_BG(dlsch_pdu->TBS, dlsch_pdu->targetCodeRate);
+
   int bw_tbslbrm = current_DL_BWP ? mac->sc_info.dl_bw_tbslbrm : dlsch_pdu->BWPSize;
   dlsch_pdu->tbslbrm = nr_compute_tbslbrm(dlsch_pdu->mcs_table, bw_tbslbrm, 1);
 
@@ -1163,6 +1165,8 @@ static int nr_ue_process_dci_dl_11(module_id_t module_id,
     dlsch_pdu->TBS = current_harq->TBS;
   }
 
+  dlsch_pdu->ldpcBaseGraph = get_BG(dlsch_pdu->TBS, dlsch_pdu->targetCodeRate);
+
   // TBS_LBRM according to section 5.4.2.1 of 38.212
   AssertFatal(sc_info->maxMIMO_Layers_PDSCH != NULL, "Option with max MIMO layers not configured is not supported\n");
   int nl_tbslbrm = *sc_info->maxMIMO_Layers_PDSCH < 4 ? *sc_info->maxMIMO_Layers_PDSCH : 4;

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

@@ -739,6 +739,7 @@ int nr_config_pusch_pdu(NR_UE_MAC_INST_t *mac,
     pusch_config_pdu->target_code_rate = mac->ul_harq_info[pid].R;
     pusch_config_pdu->pusch_data.tb_size = mac->ul_harq_info[pid].TBS;
   }
+  pusch_config_pdu->ldpcBaseGraph = get_BG(pusch_config_pdu->pusch_data.tb_size << 3, pusch_config_pdu->target_code_rate);
   return 0;
 }