diff --git a/openair1/PHY/INIT/nr_init_ue.c b/openair1/PHY/INIT/nr_init_ue.c
index f55d18661f..6ab53be0c9 100644
--- a/openair1/PHY/INIT/nr_init_ue.c
+++ b/openair1/PHY/INIT/nr_init_ue.c
@@ -335,8 +335,8 @@ int init_nr_ue_signal(PHY_VARS_NR_UE *ue,
     AssertFatal(((prs_vars[idx]->prs_ch_estimates!=NULL) || (prs_vars[idx]->prs_ch_estimates_time!=NULL)), "NR UE init: PRS channel estimates malloc failed\n");
 
     for (i=0; i<fp->nb_antennas_rx; i++) {
-      prs_vars[idx]->prs_ch_estimates[i]      = (int32_t *)malloc16_clear(fp->ofdm_symbol_size*NR_MAX_NUM_PRS_SYMB*sizeof(int32_t));
-      prs_vars[idx]->prs_ch_estimates_time[i] = (int32_t *)malloc16_clear(fp->ofdm_symbol_size*NR_MAX_NUM_PRS_SYMB*sizeof(int32_t));
+      prs_vars[idx]->prs_ch_estimates[i]      = (int32_t *)malloc16_clear(fp->ofdm_symbol_size*NR_SYMBOLS_PER_SLOT*sizeof(int32_t));
+      prs_vars[idx]->prs_ch_estimates_time[i] = (int32_t *)malloc16_clear(fp->ofdm_symbol_size*NR_SYMBOLS_PER_SLOT*sizeof(int32_t));
       AssertFatal(((prs_vars[idx]->prs_ch_estimates[i]!=NULL) || (prs_vars[idx]->prs_ch_estimates_time[i]!=NULL)), "NR UE init: PRS channel estimates malloc failed %d\n", i);
     }
   }
diff --git a/openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c b/openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
index 508a7f22de..a2d571bf3a 100644
--- a/openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
+++ b/openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
@@ -36,7 +36,7 @@
 //#define DEBUG_PDCCH
 //#define DEBUG_CH
 //#define DEBUG_PRS_CHEST
-#define DEBUG_PRS_PRINTS
+//#define DEBUG_PRS_PRINTS
 extern short nr_qpsk_mod_table[8];
 
 int nr_prs_channel_estimation(uint8_t gNB_id,
@@ -436,11 +436,11 @@ int nr_prs_channel_estimation(uint8_t gNB_id,
 #endif
 
     // T tracer dump
-    T(T_UE_PHY_DL_CHANNEL_ESTIMATE_FREQ, T_INT(0),
+    T(T_UE_PHY_DL_CHANNEL_ESTIMATE_FREQ, T_INT(gNB_id),
       T_INT(proc->frame_rx), T_INT(proc->nr_slot_rx),
       T_INT(rxAnt), T_BUFFER(&prs_chestF[rxAnt][prs_cfg->SymbolStart*frame_params->ofdm_symbol_size], prs_cfg->NumPRSSymbols*frame_params->ofdm_symbol_size*sizeof(int32_t)));
 
-    T(T_UE_PHY_DL_CHANNEL_ESTIMATE, T_INT(0),
+    T(T_UE_PHY_DL_CHANNEL_ESTIMATE, T_INT(gNB_id),
       T_INT(proc->frame_rx), T_INT(proc->nr_slot_rx),
       T_INT(rxAnt), T_BUFFER(&prs_chestT[rxAnt][prs_cfg->SymbolStart*frame_params->ofdm_symbol_size], prs_cfg->NumPRSSymbols*frame_params->ofdm_symbol_size*sizeof(int32_t)));
 
diff --git a/openair1/PHY/defs_nr_UE.h b/openair1/PHY/defs_nr_UE.h
index c3777a4f54..3acad7f96f 100644
--- a/openair1/PHY/defs_nr_UE.h
+++ b/openair1/PHY/defs_nr_UE.h
@@ -387,6 +387,7 @@ typedef struct {
   prs_data_t prs_cfg;
   int32_t **prs_ch_estimates;
   int32_t **prs_ch_estimates_time;
+  int64_t reserved;
 } NR_UE_PRS;
 
 #define NR_PDCCH_DEFS_NR_UE
@@ -830,6 +831,9 @@ typedef struct {
   NR_UE_DLSCH_t   *dlsch_p[NUMBER_OF_CONNECTED_gNB_MAX];
   NR_UE_DLSCH_t   *dlsch_MCH[NUMBER_OF_CONNECTED_gNB_MAX];
   NR_UE_PRS       *prs_vars[NR_MAX_PRS_COMB_SIZE];
+  uint16_t        prs_active_gNBs;
+  uint8_t         prs_start_symb;
+  uint8_t         prs_end_symb;
   
   //Paging parameters
   uint32_t              IMSImod1024;
diff --git a/openair1/PHY/defs_nr_common.h b/openair1/PHY/defs_nr_common.h
index cfcd88258e..aba8f93ba1 100644
--- a/openair1/PHY/defs_nr_common.h
+++ b/openair1/PHY/defs_nr_common.h
@@ -375,22 +375,22 @@ struct NR_DL_FRAME_PARMS {
 };
 
 // PRS structures prototype
-typedef struct prs {
-    int PRSResourceSetPeriod[2]; //[slot period, slot offset]
-    int PRSResourceOffset; // array if more than one resource sets.slot offset (0...511) (default 0)
-    int PRSResourceRepetition;// slot offset (1 (default), 2, 4, 6, 8, 16, 32)
-    int PRSResourceTimeGap; // slot offset (1 (default), 2, 4, 6, 8, 16, 32)
-    int NumRB; //number of RBs in freq domain a scalar =< 275 RB
-    int NumPRSSymbols; //number of PRS symbols in time domain
-    int SymbolStart; //starting OFDM symbol of PRS resource in time domain
-    int RBOffset; //Starting PRB index of all PRS resources in a PRS resource set.
-    int CombSize; //RE density of all PRS resources in a PRS resource set. i∈{2,4,6,12}
-    int REOffset; //Starting RE offset in the first OFDM symbol of each PRS resource in a PRS resource set.
-    int MutingPattern1[2]; //Muting bit pattern option-1, specified as [] or a binary-valued vector of length 2, 4, 6, 8, 16, or 32.
-    int MutingPattern2[2];
-    int MutingBitRepetition;
-    int NPRSID;
-} prs_data_t;
+typedef struct {
+    uint16_t PRSResourceSetPeriod[2]; //[slot period, slot offset]
+    uint8_t PRSResourceOffset; // array if more than one resource sets.slot offset (0...511) (default 0)
+    uint8_t PRSResourceRepetition;// slot offset (1 (default), 2, 4, 6, 8, 16, 32)
+    uint8_t PRSResourceTimeGap; // slot offset (1 (default), 2, 4, 6, 8, 16, 32)
+    uint8_t NumRB; //number of RBs in freq domain a scalar =< 275 RB
+    uint8_t NumPRSSymbols; //number of PRS symbols in time domain
+    uint8_t SymbolStart; //starting OFDM symbol of PRS resource in time domain
+    uint8_t RBOffset; //Starting PRB index of all PRS resources in a PRS resource set.
+    uint8_t CombSize; //RE density of all PRS resources in a PRS resource set. i∈{2,4,6,12}
+    uint8_t REOffset; //Starting RE offset in the first OFDM symbol of each PRS resource in a PRS resource set.
+    uint32_t MutingPattern1[2]; //Muting bit pattern option-1, specified as [] or a binary-valued vector of length 2, 4, 6, 8, 16, or 32.
+    uint32_t MutingPattern2[2];
+    uint8_t MutingBitRepetition;
+    uint16_t NPRSID;
+} prs_data_t; //32bytes
 
 #define KHz (1000UL)
 #define MHz (1000*KHz)
diff --git a/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c b/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
index bfcf1a5954..6114d30652 100644
--- a/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
+++ b/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
@@ -1674,7 +1674,7 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
     ue->prs_vars[gNB_id]->prs_cfg.PRSResourceTimeGap=1;
     ue->prs_vars[gNB_id]->prs_cfg.NPRSID=0;
 */
-    for(int j = ue->prs_vars[gNB_id]->prs_cfg.SymbolStart; j < (ue->prs_vars[gNB_id]->prs_cfg.SymbolStart + ue->prs_vars[gNB_id]->prs_cfg.NumPRSSymbols); j++)
+    for(int j = ue->prs_start_symb; j < ue->prs_end_symb; j++)
     {
             nr_slot_fep(ue,
                         proc,
@@ -1683,7 +1683,8 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
     }
 
     //PRS channel estimation
-    nr_prs_channel_estimation(gNB_id,ue,proc,fp);
+    for(int gIdx = 0; gIdx < ue->prs_active_gNBs; gIdx++)
+      nr_prs_channel_estimation(gIdx,ue,proc,fp);
   }
 
   if ((frame_rx%64 == 0) && (nr_slot_rx==0)) {
diff --git a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
index 2be3a2537e..e7b6d4e514 100644
--- a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
+++ b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
@@ -1278,17 +1278,17 @@ void RCconfig_nr_ue_L1(void) {
 
 void RCconfig_nrUE_prs(void *cfg)
 {
-  int j = 0, gNB_id = 0;
+  int j = 0, gNB_id = 0, prs_start = 0, prs_end = 0;
   char aprefix[MAX_OPTNAME_SIZE*2 + 8];
   PHY_VARS_NR_UE *ue = (PHY_VARS_NR_UE *)cfg;
 
   paramlist_def_t gParamList = {CONFIG_STRING_PRS_LIST,NULL,0};
   paramdef_t gParams[] = PRS_GLOBAL_PARAMS_DESC;
   config_getlist( &gParamList,gParams,sizeof(gParams)/sizeof(paramdef_t), NULL);
-  int num_gnbs = *(gParamList.paramarray[j][PRS_ACTIVE_GNBS_IDX].uptr);
+  ue->prs_active_gNBs = *(gParamList.paramarray[j][PRS_ACTIVE_GNBS_IDX].uptr);
 
   paramlist_def_t PRS_ParamList = {{0},NULL,0};
-  for(int i = 0; i < num_gnbs; i++)
+  for(int i = 0; i < ue->prs_active_gNBs; i++)
   {
     paramdef_t PRS_Params[] = PRS_PARAMS_DESC;
     sprintf(PRS_ParamList.listname, "%s%i", CONFIG_STRING_PRS_CONFIG, i);
@@ -1311,9 +1311,18 @@ void RCconfig_nrUE_prs(void *cfg)
         ue->prs_vars[gNB_id]->prs_cfg.PRSResourceRepetition    = *(PRS_ParamList.paramarray[j][PRS_RESOURCE_REPETITION].uptr);
         ue->prs_vars[gNB_id]->prs_cfg.PRSResourceTimeGap       = *(PRS_ParamList.paramarray[j][PRS_RESOURCE_TIME_GAP].uptr);
         ue->prs_vars[gNB_id]->prs_cfg.NPRSID                   = *(PRS_ParamList.paramarray[j][PRS_ID].uptr);
-
+        if(gNB_id==0)
+        {
+          prs_start = ue->prs_vars[gNB_id]->prs_cfg.SymbolStart;
+          prs_end   = ue->prs_vars[gNB_id]->prs_cfg.SymbolStart+ue->prs_vars[gNB_id]->prs_cfg.NumPRSSymbols;
+        }
+        else
+        {
+          prs_start = MIN((prs_start), (ue->prs_vars[gNB_id]->prs_cfg.SymbolStart));
+          prs_end   = MAX((prs_end),   (ue->prs_vars[gNB_id]->prs_cfg.SymbolStart+ue->prs_vars[gNB_id]->prs_cfg.NumPRSSymbols));
+        }
         LOG_I(PHY, "--------------------------\n");
-        LOG_I(PHY, "PRS Config for gNB_id %d\n", gNB_id);
+        LOG_I(PHY, "PRS Config for gNB_id %d @ %p\n", gNB_id, &ue->prs_vars[gNB_id]->prs_cfg);
         LOG_I(PHY, "--------------------------\n");
         LOG_I(PHY, "PRSResourceSetPeriod0 %d\n", ue->prs_vars[gNB_id]->prs_cfg.PRSResourceSetPeriod[0]);
         LOG_I(PHY, "PRSResourceSetPeriod1 %d\n", ue->prs_vars[gNB_id]->prs_cfg.PRSResourceSetPeriod[1]);
@@ -1335,4 +1344,7 @@ void RCconfig_nrUE_prs(void *cfg)
       LOG_I(NR_PHY,"No %s configuration found\n", PRS_ParamList.listname);
     }
   }
+  ue->prs_start_symb = prs_start;
+  ue->prs_end_symb   = prs_end;
+  LOG_I(PHY, "prs_active_gNBs %d, prs_start_symb %d, prs_end_symb %d\n", ue->prs_active_gNBs, ue->prs_start_symb, ue->prs_end_symb);
 }