From 910912a443118adc30dbf413043501b8b79a99e6 Mon Sep 17 00:00:00 2001
From: ahadi <mohsen.ahadi@eurecom.fr>
Date: Fri, 10 Dec 2021 11:14:09 +0100
Subject: [PATCH] adding prs structure

---
 openair1/PHY/NR_TRANSPORT/nr_prs.c        | 23 +++++++----------
 openair1/SCHED_NR/phy_procedures_nr_gNB.c | 31 ++++++++++-------------
 2 files changed, 22 insertions(+), 32 deletions(-)

diff --git a/openair1/PHY/NR_TRANSPORT/nr_prs.c b/openair1/PHY/NR_TRANSPORT/nr_prs.c
index eba6be157a..3e2cee2e7b 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_prs.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_prs.c
@@ -28,36 +28,31 @@ int nr_generate_prs(uint32_t **nr_gold_prs,
   int k_prime = 0;
   int k=0;
   int16_t mod_prs[NR_MAX_PRS_LENGTH<<1];
-  uint8_t idx=0;
-  uint8_t combSize = 6;
-  uint8_t REOffset = 0;
-  uint8_t symbolStart = 5;
-  uint8_t NumPRSSymbols = 6;
-  uint16_t NumPRBs = 106;
+  uint8_t idx=prs_data->NPRSID;
   
   // QPSK modulation
   
    // PRS resource mapping with combsize=k which means PRS symbols exist in every k-th subcarrier in frequency domain
    // According to ts138.211 sec.7.4.1.7.2
 
-  for (int l = symbolStart; l < symbolStart + NumPRSSymbols; l++) {
+  for (int l = prs_data->SymbolStart; l < prs_data->SymbolStart + prs_data->NumPRSSymbols; l++) {
 
     int symInd = l-5;
-    if (combSize==2) {
+    if (prs_data->CombSize == 2) {
       k_prime = k_prime_table[0][symInd];
     }
-    else if (combSize==4){
+    else if (prs_data->CombSize == 4){
       k_prime = k_prime_table[1][symInd];
     }
-    else if (combSize==6){
+    else if (prs_data->CombSize == 6){
       k_prime = k_prime_table[2][symInd];
     }
-    else if (combSize==12){
+    else if (prs_data->CombSize == 12){
       k_prime = k_prime_table[3][symInd];
     }
     
-    k = (REOffset+k_prime)%combSize + frame_parms->ssb_start_subcarrier;
-    for (int m = 0; m < 12/combSize*NumPRBs; m++) {
+    k = (prs_data->REOffset+k_prime) % prs_data->CombSize + frame_parms->ssb_start_subcarrier;
+    for (int m = 0; m < 12/prs_data->CombSize * prs_data->NumRB; m++) {
       
 #ifdef DEBUG_PRS_MAP
       printf("m %d at k %d of l %d\n", m, k, l);
@@ -81,7 +76,7 @@ int nr_generate_prs(uint32_t **nr_gold_prs,
            ((int16_t *)txdataF)[((l*frame_parms->ofdm_symbol_size + k)<<1)+1]);
 #endif
 
-    k = k +  combSize;
+    k = k +  prs_data->CombSize;
     
     if (k >= frame_parms->ofdm_symbol_size)
       k-=frame_parms->ofdm_symbol_size;
diff --git a/openair1/SCHED_NR/phy_procedures_nr_gNB.c b/openair1/SCHED_NR/phy_procedures_nr_gNB.c
index 8288bb9d51..b771a9234d 100644
--- a/openair1/SCHED_NR/phy_procedures_nr_gNB.c
+++ b/openair1/SCHED_NR/phy_procedures_nr_gNB.c
@@ -148,22 +148,6 @@ void phy_procedures_gNB_TX(PHY_VARS_gNB *gNB,
   
   // defining inputs and initials for nr_generate_prs()
   int **txdataF = gNB->common_vars.txdataF;
-  uint8_t ssb_index,n_hf;
-  ssb_index = ssb_pdu.ssb_pdu_rel15.SsbBlockIndex;
-  LOG_D(PHY,"common_signal_procedures: frame %d, slot %d ssb index %d\n",frame,slot,ssb_index);
-  
-  uint16_t ssb_start_symbol;
-  int ssb_start_symbol_abs = nr_get_ssb_start_symbol(fp,ssb_index); // computing the starting symbol for current ssb
-  ssb_start_symbol = ssb_start_symbol_abs % fp->symbols_per_slot;  // start symbol wrt slot
-  
-  
-  
-  uint16_t slots_per_hf = (fp->slots_per_frame)>>1;
-  
-  if (slot<slots_per_hf)
-    n_hf=0;
-  else
-    n_hf=1;
     
 
   if ((cfg->cell_config.frame_duplex_type.value == TDD) &&
@@ -242,8 +226,19 @@ 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
   prs_data_t prs_data;
-  prs_data.PRSResourceSetPeriod[0]=0;
-  prs_data.PRSResourceSetPeriod[1]=0;
+  prs_data.PRSResourceSetPeriod[0]=40; // PRS resource slot period
+  prs_data.PRSResourceSetPeriod[1]=0;  // resource slot offset
+  prs_data.SymbolStart=5;		
+  prs_data.NumPRSSymbols=6;
+  prs_data.NumRB=106;
+  prs_data.RBOffset=0;
+  prs_data.CombSize=6;
+  prs_data.REOffset=0;
+  prs_data.PRSResourceOffset=0;
+  prs_data.PRSResourceRepetition=1;
+  prs_data.PRSResourceTimeGap=1;
+  prs_data.NPRSID=0;
+  
   // tbc
   
   nr_generate_prs(gNB->nr_gold_prs[slot],&txdataF[0][txdataF_offset], AMP, &prs_data, cfg, fp);