adding pseudo code to start prs development

openair1/PHY/INIT/nr_init.c

@@ -194,6 +194,23 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
 
   nr_init_csi_rs(gNB, cfg->cell_config.phy_cell_id.value);
 
+  //PRS init
+  gNB->nr_gold_prs = (uint32_t ***)malloc16(fp->slots_per_frame*sizeof(uint32_t **));
+  uint32_t ***prs = gNB->nr_gold_prs;
+  AssertFatal(prs!=NULL, "NR init: positioning reference signal malloc failed\n");
+
+  for (int slot=0; slot<fp->slots_per_frame; slot++) {
+    prs[slot] = (uint32_t **)malloc16(fp->symbols_per_slot*sizeof(uint32_t *));
+    AssertFatal(prs[slot]!=NULL, "NR init: positioning reference signal for slot %d - malloc failed\n", slot);
+
+    for (int symb=0; symb<fp->symbols_per_slot; symb++) {
+      prs[slot][symb] = (uint32_t *)malloc16(NR_MAX_PRS_INIT_LENGTH_DWORD*sizeof(uint32_t));
+      AssertFatal(prs[slot][symb]!=NULL, "NR init: positioning reference signal for slot %d symbol %d - malloc failed\n", slot, symb);
+    }
+  }
+
+  nr_init_prs(...);
+  
   /* Generate low PAPR type 1 sequences for PUSCH DMRS, these are used if transform precoding is enabled.  */
   generate_lowpapr_typ1_refsig_sequences(SHRT_MAX);
 

openair1/PHY/NR_REFSIG/nr_gold.c

@@ -153,3 +153,5 @@ void nr_init_csi_rs(PHY_VARS_gNB* gNB, uint32_t Nid)
   }
 
 }
+
+void nr_init_prs(PHY_VARS_gNB* gNB, uint32_t Nid, ...)

openair1/PHY/defs_gNB.h

@@ -811,6 +811,9 @@ typedef struct PHY_VARS_gNB_s {
   /// CSI  RS sequence
   uint32_t ***nr_gold_csi_rs;
 
+  /// PRS sequence
+  uint32_t ***nr_gold_prs;
+  
   /// Indicator set to 0 after first SR
   uint8_t first_sr[NUMBER_OF_NR_SR_MAX];
 

openair1/PHY/defs_nr_common.h

@@ -80,6 +80,9 @@
 #define NR_MAX_CSI_RS_LENGTH 4400 //275*8(max allocation per RB)*2(QPSK)
 #define NR_MAX_CSI_RS_INIT_LENGTH_DWORD 138  // ceil(NR_MAX_CSI_RS_LENGTH/32)
 
+#define NR_MAX_PRS_LENGTH 3264 //272*6(max allocation per RB)*2(QPSK)
+#define NR_MAX_PRS_INIT_LENGTH_DWORD 102 // ceil(NR_MAX_CSI_RS_LENGTH/32)
+
 #define NR_MAX_PUSCH_DMRS_LENGTH NR_MAX_PDSCH_DMRS_LENGTH 
 #define NR_MAX_PUSCH_DMRS_INIT_LENGTH_DWORD NR_MAX_PDSCH_DMRS_INIT_LENGTH_DWORD
 

openair1/SCHED_NR/phy_procedures_nr_gNB.c

@@ -206,6 +206,9 @@ void phy_procedures_gNB_TX(PHY_VARS_gNB *gNB,
     }
   }
 
+  //TODO: nr_generate_prs
+  // check if we have prs to transmit in this frame and slot
+
   if (do_meas==1) stop_meas(&gNB->phy_proc_tx);
 
   if ((frame&127) == 0) dump_pdsch_stats(gNB);

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -960,6 +960,7 @@ int main(int argc, char **argv)
   //NR_COMMON_channels_t *cc = RC.nrmac[0]->common_channels;
   snrRun = 0;
 
+  //TODO: configure parameters for PRS
 
   for (SNR = snr0; SNR < snr1; SNR += .2) {