using numDmrsCdmGrpsNoData for PDSCH in PHY

openair1/PHY/NR_TRANSPORT/nr_dlsch.c

@@ -133,19 +133,22 @@ uint8_t nr_generate_pdsch(NR_gNB_DLSCH_t *dlsch,
   int16_t **mod_symbs = (int16_t**)dlsch->mod_symbs;
   int16_t **tx_layers = (int16_t**)dlsch->txdataF;
   int8_t Wf[2], Wt[2], l0, l_prime[2], delta;
-  uint8_t nodata_dmrs = 1;
   uint8_t dmrs_Type = rel15->dmrsConfigType;
-  int nb_re_dmrs = (dmrs_Type== NFAPI_NR_DMRS_TYPE1) ? 6:4;
-  uint16_t n_dmrs = ((rel15->rbSize+rel15->rbStart)*nb_re_dmrs)<<1;
-  int16_t mod_dmrs[n_dmrs<<1];
-
+  int nb_re_dmrs;
+  uint16_t n_dmrs;
+  if (rel15->dmrsConfigType==NFAPI_NR_DMRS_TYPE1) {
+    nb_re_dmrs = 6*rel15->numDmrsCdmGrpsNoData;
+    n_dmrs = ((rel15->rbSize+rel15->rbStart)*6)<<1;
+  }
+  else {
+    nb_re_dmrs = 4*rel15->numDmrsCdmGrpsNoData;
+    n_dmrs = ((rel15->rbSize+rel15->rbStart)*4)<<1;
+  }
   uint16_t nb_re;
-  if (nodata_dmrs) // no data in dmrs symbol
-    nb_re = ((12*rel15->NrOfSymbols)-12-xOverhead)*rel15->rbSize*rel15->NrOfCodewords;
-  else
   nb_re = ((12*rel15->NrOfSymbols)-nb_re_dmrs-xOverhead)*rel15->rbSize*rel15->NrOfCodewords;
   uint8_t Qm = rel15->qamModOrder[0];
   uint32_t encoded_length = nb_re*Qm;
+  int16_t mod_dmrs[n_dmrs<<1];
 
   /// CRC, coding, interleaving and rate matching
   AssertFatal(harq->pdu!=NULL,"harq->pdu is null\n");
@@ -301,7 +304,7 @@ uint8_t nr_generate_pdsch(NR_gNB_DLSCH_t *dlsch,
         }
 
         else {
-          if( (l != dmrs_symbol) || !nodata_dmrs) {
+          if( (l != dmrs_symbol) || allowed_pdsch_re_in_dmrs_symbol(k,start_sc,rel15->numDmrsCdmGrpsNoData,dmrs_Type)) {
             ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (amp * tx_layers[ap][m<<1]) >> 15;
             ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (amp * tx_layers[ap][(m<<1) + 1]) >> 15;
 #ifdef DEBUG_DLSCH_MAPPING

openair1/PHY/NR_TRANSPORT/nr_dlsch_coding.c

@@ -336,12 +336,13 @@ int nr_dlsch_encoding(unsigned char *a,
   uint32_t E;
   uint8_t Ilbrm = 1;
   uint32_t Tbslbrm = 950984; //max tbs
-  uint8_t nodata_dmrs = 1;
   uint8_t nb_re_dmrs;
-  if (nodata_dmrs)
-    nb_re_dmrs = 12;
+
+  if (rel15->dmrsConfigType==NFAPI_NR_DMRS_TYPE1)
+    nb_re_dmrs = 6*rel15->numDmrsCdmGrpsNoData;
   else
-    nb_re_dmrs = rel15->dmrsConfigType==NFAPI_NR_DMRS_TYPE1 ? 6:4;
+    nb_re_dmrs = 4*rel15->numDmrsCdmGrpsNoData;
+
   uint16_t length_dmrs = get_num_dmrs(rel15->dlDmrsSymbPos);
   uint16_t R=rel15->targetCodeRate[0];
   float Coderate = 0.0;

openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.c

@@ -84,6 +84,27 @@ uint16_t get_dmrs_freq_idx(uint16_t n, uint8_t k_prime, uint8_t delta, uint8_t d
   return dmrs_idx;
 }
 
+
+uint8_t allowed_pdsch_re_in_dmrs_symbol(uint16_t k,
+                                        uint16_t start_sc,
+                                        uint8_t numDmrsCdmGrpsNoData,
+                                        uint8_t dmrs_type) {
+  uint8_t delta;
+  for (int i = 0; i<numDmrsCdmGrpsNoData; i++){
+    if  (dmrs_type==NFAPI_NR_DMRS_TYPE1) {
+      delta = i;
+      if (((k-start_sc)%2)  == delta)
+        return (0);
+    }
+    else {
+      delta = i<<1;
+      if ( (((k-start_sc)%6)  == delta) || (((k-start_sc)%6)  == (delta+1)) )
+        return (0);
+    }
+  }
+  return (1);
+}
+
 uint8_t get_l0(uint16_t dlDmrsSymbPos) {
 
   uint16_t mask=dlDmrsSymbPos;

openair1/PHY/NR_TRANSPORT/nr_sch_dmrs.h

@@ -48,6 +48,11 @@ uint8_t get_delta(uint8_t ap, uint8_t config);
 
 uint16_t get_dmrs_freq_idx(uint16_t n, uint8_t k_prime, uint8_t delta, uint8_t dmrs_type);
 
+uint8_t allowed_pdsch_re_in_dmrs_symbol(uint16_t k,
+                                        uint16_t start_sc,
+                                        uint8_t numDmrsCdmGrpsNoData,
+                                        uint8_t dmrs_type);
+
 uint8_t get_l0(uint16_t dlDmrsSymbPos);
 
 #endif

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -1419,7 +1419,7 @@ int32_t get_nr_uldl_offset(int nr_bandP)
 
 void nr_get_tbs_dl(nfapi_nr_dl_tti_pdsch_pdu *pdsch_pdu,
 		   int x_overhead,
-                   uint8_t nodata_dmrs,
+                   uint8_t numdmrscdmgroupnodata,
                    uint8_t tb_scaling) {
 
   LOG_D(MAC, "TBS calculation\n");
@@ -1427,10 +1427,14 @@ void nr_get_tbs_dl(nfapi_nr_dl_tti_pdsch_pdu *pdsch_pdu,
   nfapi_nr_dl_tti_pdsch_pdu_rel15_t *pdsch_rel15 = &pdsch_pdu->pdsch_pdu_rel15;
   uint16_t N_PRB_oh = x_overhead;
   uint8_t N_PRB_DMRS;
-  if (nodata_dmrs)
-    N_PRB_DMRS = 12;
-  else
-    N_PRB_DMRS = (pdsch_rel15->dmrsConfigType == NFAPI_NR_DMRS_TYPE1)?6:4; //This only works for antenna port 1000
+  if (pdsch_rel15->dmrsConfigType == NFAPI_NR_DMRS_TYPE1) {
+    // if no data in dmrs cdm group is 1 only even REs have no data
+    // if no data in dmrs cdm group is 2 both odd and even REs have no data
+    N_PRB_DMRS = numdmrscdmgroupnodata*6;
+  }
+  else {
+    N_PRB_DMRS = numdmrscdmgroupnodata*4;
+  }
   uint8_t N_sh_symb = pdsch_rel15->NrOfSymbols;
   uint8_t Imcs = pdsch_rel15->mcsIndex[0];
   uint16_t N_RE_prime = NR_NB_SC_PER_RB*N_sh_symb - N_PRB_DMRS - N_PRB_oh;

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

@@ -698,7 +698,7 @@ void nr_generate_Msg2(module_id_t module_idP,
     LOG_D(MAC,"[gNB %d][RAPROC] Frame %d, Subframe %d: RA state %d\n", module_idP, frameP, slotP, ra->state);
 
     x_Overhead = 0;
-    nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu, x_Overhead, 1, dci_pdu_rel15[0].tb_scaling);
+    nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu, x_Overhead, pdsch_pdu_rel15->numDmrsCdmGrpsNoData, dci_pdu_rel15[0].tb_scaling);
 
     // DL TX request
     tx_req->PDU_length = pdsch_pdu_rel15->TBSize[0];

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_phytest.c

@@ -369,6 +369,7 @@ int configure_fapi_dl_pdu(int Mod_idP,
   dci_pdu_rel15[0].harq_pid = 0;
   // DAI
   dci_pdu_rel15[0].dai[0].val = (pucch_sched->dai_c-1)&3;
+
   // TPC for PUCCH
   dci_pdu_rel15[0].tpc = 1; // table 7.2.1-1 in 38.213
   // PUCCH resource indicator
@@ -444,7 +445,7 @@ int configure_fapi_dl_pdu(int Mod_idP,
 	pdcch_pdu_rel15->DurationSymbols);
 
   int x_Overhead = 0; // should be 0 for initialBWP
-  nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu, x_Overhead,1,0);
+  nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu,x_Overhead,pdsch_pdu_rel15->numDmrsCdmGrpsNoData,0);
 
   // Hardcode it for now
   TBS = dl_tti_pdsch_pdu->pdsch_pdu.pdsch_pdu_rel15.TBSize[0];

openair2/LAYER2/NR_MAC_gNB/mac_proto.h

@@ -226,7 +226,7 @@ int to_absslot(nfapi_nr_config_request_scf_t *cfg,int frame,int slot);
 
 void nr_get_tbs_dl(nfapi_nr_dl_tti_pdsch_pdu *pdsch_pdu,
 		   int x_overhead,
-                   uint8_t nodata_dmrs,
+                   uint8_t numdmrscdmgroupnodata,
                    uint8_t tb_scaling);
 /** \brief Computes Q based on I_MCS PDSCH and table_idx for downlink. Implements MCS Tables from 38.214. */
 uint8_t nr_get_Qm_dl(uint8_t Imcs, uint8_t table_idx);