phy_procedures_lte_common.c 22.5 KB
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/*******************************************************************************
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    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom
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    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
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    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is 
   included in this distribution in the file called "COPYING". If not, 
   see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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 *******************************************************************************/
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/*! \file phy_procedures_lte_eNB.c
* \brief Implementation of common utilities for eNB/UE procedures from 36.213 LTE specifications
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "MAC_INTERFACE/defs.h"
#include "MAC_INTERFACE/extern.h"
#include "SCHED/defs.h"
#include "SCHED/extern.h"

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#ifdef LOCALIZATION 
#include <sys/time.h>
#endif 
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void get_Msg3_alloc(LTE_DL_FRAME_PARMS *frame_parms,
		    unsigned char current_subframe, 
		    unsigned int current_frame,
		    unsigned int *frame,
		    unsigned char *subframe) {

  // Fill in other TDD Configuration!!!!

  if (frame_parms->frame_type == FDD) {
    *subframe = current_subframe+6;
    if (*subframe>9) {
      *subframe = *subframe-10;
      *frame = current_frame+1;
    }
    else {
      *frame=current_frame;
    }
  }
  else { // TDD
    if (frame_parms->tdd_config == 1) {
      switch (current_subframe) {
	
      case 0:
	*subframe = 7;
	*frame = current_frame;
	break;
      case 4:
	*subframe = 2;
	*frame = current_frame+1;
	break;
      case 5:
	*subframe = 2;
	*frame = current_frame+1;
	break;
      case 9:
	*subframe = 7;
	*frame = current_frame+1;
	break;
      }
    }
    else if (frame_parms->tdd_config == 3) {
      switch (current_subframe) {
	
      case 0:
      case 5:
      case 6:
	*subframe = 2;
	*frame = current_frame+1;
	break;
      case 7:
	*subframe = 3;
	*frame = current_frame+1;
	break;
      case 8:
	*subframe = 4;
	*frame = current_frame+1;
	break;
      case 9:
	*subframe = 2;
	*frame = current_frame+2;
	break;
      }
    }
  }
}

void get_Msg3_alloc_ret(LTE_DL_FRAME_PARMS *frame_parms,
			unsigned char current_subframe, 
			unsigned int current_frame,
			unsigned int *frame,
			unsigned char *subframe) {
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  if (frame_parms->frame_type == FDD) {
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    // always retransmit in n+8
    *subframe = current_subframe+8;
    if (*subframe>9) {
      *subframe = *subframe-10;
      *frame = current_frame+1;
    }
    else {
      *frame=current_frame;
    }
  }
  else {
    if (frame_parms->tdd_config == 1) {
      // original PUSCH in 2, PHICH in 6 (S), ret in 2
      // original PUSCH in 3, PHICH in 9, ret in 3
      // original PUSCH in 7, PHICH in 1 (S), ret in 7
      // original PUSCH in 8, PHICH in 4, ret in 8
      *frame = current_frame+1;
    }
    else if (frame_parms->tdd_config == 3) {
      // original PUSCH in 2, PHICH in 8, ret in 2 next frame
      // original PUSCH in 3, PHICH in 9, ret in 3 next frame
      // original PUSCH in 4, PHICH in 0, ret in 4 next frame
      *frame=current_frame+1;
    }
  }
}

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uint8_t get_Msg3_harq_pid(LTE_DL_FRAME_PARMS *frame_parms,
		     uint32_t frame,
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		     unsigned char current_subframe) {

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  uint8_t ul_subframe=0;
  uint32_t ul_frame;
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  if (frame_parms->frame_type ==FDD) {
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    ul_subframe = (current_subframe>3) ? (current_subframe-4) : (current_subframe+6);
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    ul_frame    = (current_subframe>3) ? (frame+1) : frame; 
  }
  else {
    switch (frame_parms->tdd_config) {
    case 1:
      switch (current_subframe) {

      case 9:
      case 0:
	ul_subframe = 7;
	break;
      case 5:
      case 7:
	ul_subframe = 2;
	break;

      }
      break;
    case 3:
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
	ul_subframe = 2;
	break;
      case 7:
	ul_subframe = 3;
	break;
      case 8:
	ul_subframe = 4;
	break;
      case 9:
	ul_subframe = 2;
	break;
      }
      break;
    case 4:
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
      case 8:
      case 9:
	ul_subframe = 2;
	break;
      case 7:
	ul_subframe = 3;
	break;
      }
      break;
    case 5:
      ul_subframe =2;
      break;
    default:
      LOG_E(PHY,"get_Msg3_harq_pid: Unsupported TDD configuration %d\n",frame_parms->tdd_config);
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      mac_xface->macphy_exit("get_Msg3_harq_pid: Unsupported TDD configuration");
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      break;
    }
  }
    
  return(subframe2harq_pid(frame_parms,ul_frame,ul_subframe));

}

unsigned char ul_ACK_subframe2_dl_subframe(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe,unsigned char ACK_index) {

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  if (frame_parms->frame_type == FDD) {
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    return((subframe<4) ? subframe+6 : subframe-4);
  }
  else {
    switch (frame_parms->tdd_config) {
    case 3:
      if (subframe == 2) {  // ACK subframes 5 and 6
	if (ACK_index==2)
	  return(1);
	return(5+ACK_index);
      }
      else if (subframe == 3) {   // ACK subframes 7 and 8
	return(7+ACK_index);  // To be updated
      }
      else if (subframe == 4) {  // ACK subframes 9 and 0
	return((9+ACK_index)%10);
      }
      else {
	LOG_E(PHY,"phy_procedures_lte_common.c/subframe2_dl_harq_pid: illegal subframe %d for tdd_config %d\n",
	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    case 1:
      if (subframe == 2) {  // ACK subframes 5 and 6
	return(5+ACK_index);
      }
      else if (subframe == 3) {   // ACK subframe 9
	return(9);  // To be updated
      }
      else if (subframe == 7) {   // ACK subframes 0 and 1
	return(ACK_index);  // To be updated
      }
      else if (subframe == 8) {   // ACK subframe 4
	return(4);  // To be updated
      }
      else {
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	LOG_E(PHY,"phy_procedures_lte_common.c/ul_ACK_subframe2_dl_subframe: illegal subframe %d for tdd_config %d\n",
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	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    }
  }
  return(0);
}

unsigned char ul_ACK_subframe2_M(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe) {

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  if (frame_parms->frame_type == FDD) {
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    return(1);
  }
  else {
    switch (frame_parms->tdd_config) {
    case 3:
      if (subframe == 2) {  // ACK subframes 5 and 6
	return(2); // should be 3
      }
      else if (subframe == 3) {   // ACK subframes 7 and 8
	return(2);  // To be updated
      }
      else if (subframe == 4) {  // ACK subframes 9 and 0
	return(2);
      }
      else {
	LOG_E(PHY,"phy_procedures_lte_common.c/subframe2_dl_harq_pid: illegal subframe %d for tdd_config %d\n",
	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    case 1:
      if (subframe == 2) {  // ACK subframes 5 and 6
	return(2);
      }
      else if (subframe == 3) {   // ACK subframe 9
	return(1);  // To be updated
      }
      else if (subframe == 7) {   // ACK subframes 0 and 1
	return(2);  // To be updated
      }
      else if (subframe == 8) {   // ACK subframe 4
	return(1);  // To be updated
      }
      else {
	LOG_E(PHY,"phy_procedures_lte_common.c/subframe2_dl_harq_pid: illegal subframe %d for tdd_config %d\n",
	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    }
  }
  return(0);
}

// This function implements table 10.1-1 of 36-213, p. 69
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uint8_t get_ack(LTE_DL_FRAME_PARMS *frame_parms,
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	   harq_status_t *harq_ack,
	   unsigned char subframe,
	   unsigned char *o_ACK) {

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  uint8_t status=0;
  uint8_t subframe_dl;
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  //  printf("get_ack: SF %d\n",subframe);
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  if (frame_parms->frame_type == FDD) {
    if (subframe < 4)
      subframe_dl = subframe + 6;
    else
      subframe_dl = subframe - 4;
    o_ACK[0] = harq_ack[subframe_dl].ack;
    status = harq_ack[subframe_dl].send_harq_status;
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    //printf("get_ack: Getting ACK/NAK for PDSCH (subframe %d) => %d\n",subframe_dl,o_ACK[0]);
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  }
  else {
    switch (frame_parms->tdd_config) {
    case 1:
      if (subframe == 2) {  // ACK subframes 5 (forget 6)
	o_ACK[0] = harq_ack[5].ack;  
	status = harq_ack[5].send_harq_status;
      }
      else if (subframe == 3) {   // ACK subframe 9
	o_ACK[0] = harq_ack[9].ack;
	status = harq_ack[9].send_harq_status;
      }
      else if (subframe == 4) {  // nothing
	status = 0;
      }
      else if (subframe == 7) {  // ACK subframes 0 (forget 1)
	o_ACK[0] = harq_ack[0].ack;  
	status = harq_ack[0].send_harq_status;
      }
      else if (subframe == 8) {   // ACK subframes 4
	o_ACK[0] = harq_ack[4].ack;
	status = harq_ack[4].send_harq_status;
      }
      else {
	LOG_E(PHY,"phy_procedures_lte.c: get_ack, illegal subframe %d for tdd_config %d\n",
	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    case 3:
      if (subframe == 2) {  // ACK subframes 5 and 6
	if (harq_ack[5].send_harq_status == 1) {
	  o_ACK[0] = harq_ack[5].ack; 
	  if (harq_ack[6].send_harq_status == 1)
	    o_ACK[1] = harq_ack[6].ack;
	} 
	else if (harq_ack[6].send_harq_status == 1)
	  o_ACK[0] = harq_ack[6].ack;
	status = harq_ack[5].send_harq_status + (harq_ack[6].send_harq_status<<1);
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	printf("Subframe 2, TDD config 3: harq_ack[5] = %d (%d),harq_ack[6] = %d (%d)\n",harq_ack[5].ack,harq_ack[5].send_harq_status,harq_ack[6].ack,harq_ack[6].send_harq_status);
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      }
      else if (subframe == 3) {   // ACK subframes 7 and 8
	if (harq_ack[7].send_harq_status == 1) {
	  o_ACK[0] = harq_ack[7].ack; 
	  if (harq_ack[8].send_harq_status == 1)
	    o_ACK[1] = harq_ack[8].ack;
	} 
	else if (harq_ack[8].send_harq_status == 1)
	  o_ACK[0] = harq_ack[8].ack;

	status = harq_ack[7].send_harq_status + (harq_ack[8].send_harq_status<<1);
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	printf("Subframe 3, TDD config 3: harq_ack[7] = %d,harq_ack[8] = %d\n",harq_ack[7].ack,harq_ack[8].ack);
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	//printf("status %d : o_ACK (%d,%d)\n", status,o_ACK[0],o_ACK[1]);
      }
      else if (subframe == 4) {  // ACK subframes 9 and 0
	if (harq_ack[9].send_harq_status == 1) {
	  o_ACK[0] = harq_ack[9].ack; 
	  if (harq_ack[0].send_harq_status == 1)
	    o_ACK[1] = harq_ack[0].ack;
	} 
	else if (harq_ack[8].send_harq_status == 1)
	  o_ACK[0] = harq_ack[8].ack;

	status = harq_ack[9].send_harq_status + (harq_ack[0].send_harq_status<<1);
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	printf("Subframe 4, TDD config 3: harq_ack[9] = %d,harq_ack[0] = %d\n",harq_ack[9].ack,harq_ack[0].ack);
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      }
      else {
	LOG_E(PHY,"phy_procedures_lte.c: get_ack, illegal subframe %d for tdd_config %d\n",
	    subframe,frame_parms->tdd_config);
	return(0);
      }
      break;
    
    }
  }
  //printf("status %d\n",status);

  return(status);
}

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uint8_t Np6[4]={0,1,3,5};
uint8_t Np15[4]={0,3,8,13};
uint8_t Np25[4]={0,5,13,22};
uint8_t Np50[4]={0,11,27,44};
uint8_t Np75[4]={0,16,41,66};
uint8_t Np100[4]={0,22,55,88};
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// This is part of the PUCCH allocation procedure (see Section 10.1 36.213)
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uint16_t get_Np(uint8_t N_RB_DL,uint8_t nCCE,uint8_t plus1) {
  uint8_t *Np;
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  switch (N_RB_DL) {
    case 6:
      Np=Np6;
      break;
    case 15:
      Np=Np15;
      break;
    case 25:
      Np=Np25;
      break;
    case 50:
      Np=Np50;
      break;
    case 75:
      Np=Np75;
      break;
    case 100:
      Np=Np100;
      break;
    default:
      LOG_E(PHY,"get_Np() FATAL: unsupported N_RB_DL %d\n",N_RB_DL);
      return(0);
      break;
    }

  if (nCCE>=Np[2])
    return(Np[2+plus1]);
  else if (nCCE>=Np[1])
    return(Np[1+plus1]);
  else
    return(Np[0+plus1]);
}

lte_subframe_t subframe_select(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe) {

  // if FDD return dummy value
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  if (frame_parms->frame_type == FDD)
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    return(SF_DL);

  switch (frame_parms->tdd_config) {

  case 1:
    switch (subframe) {
    case 0:
    case 4:
    case 5:
    case 9:
      return(SF_DL);
      break;
    case 2:
    case 3:
    case 7:
    case 8:
      return(SF_UL);
      break;
    default:
      return(SF_S);
      break;
    }
  case 3:
    if  ((subframe<1) || (subframe>=5)) 
      return(SF_DL);
    else if ((subframe>1) && (subframe < 5))  
      return(SF_UL);
    else if (subframe==1)
      return (SF_S);
    else  {
      LOG_E(PHY,"[PHY_PROCEDURES_LTE] Unknown subframe number\n");
      return(255);
    }
    break;
  default:
    LOG_E(PHY,"subframe %d Unsupported TDD configuration %d\n",subframe,frame_parms->tdd_config);
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    mac_xface->macphy_exit("subframe x Unsupported TDD configuration");
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    return(255);
    
  }
}

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lte_subframe_t get_subframe_direction(uint8_t Mod_id,uint8_t CC_id,uint8_t subframe) {
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  return(subframe_select(&PHY_vars_eNB_g[Mod_id][CC_id]->lte_frame_parms,subframe));
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}

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uint8_t phich_subframe_to_harq_pid(LTE_DL_FRAME_PARMS *frame_parms,uint32_t frame,uint8_t subframe) {
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  //LOG_D(PHY,"phich_subframe_to_harq_pid.c: frame %d, subframe %d\n",frame,subframe);
  return(subframe2harq_pid(frame_parms,
			   phich_frame2_pusch_frame(frame_parms,frame,subframe),
			   phich_subframe2_pusch_subframe(frame_parms,subframe)));
}

unsigned int is_phich_subframe(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe) {

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  if (frame_parms->frame_type == FDD) {
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    return(1);
  }
  else {
    switch (frame_parms->tdd_config) {
    case 1:
      if ((subframe == 1) || (subframe == 4) || (subframe == 6) || (subframe == 9))
	return(1);
      break;
    case 3:
      if ((subframe == 0) || (subframe == 8) || (subframe == 9))
	return(1);
      break;
    case 4:
      if ((subframe == 0) || (subframe == 8) )
	return(1);
      break;
    case 5:
      if (subframe == 0)
	return(1);
      break;
    default:
      return(0);
      break;
    }
  }
  return(0);
}


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#ifdef LOCALIZATION
double aggregate_eNB_UE_localization_stats(PHY_VARS_eNB *phy_vars_eNB, int8_t UE_id, frame_t frame, sub_frame_t subframe, int32_t UE_tx_power_dB){
    // parameters declaration
    int8_t Mod_id, CC_id;
    int32_t harq_pid, avg_power, avg_rssi, median_power, median_rssi, median_subcarrier_rss, median_TA, median_TA_update, ref_timestamp_ms, current_timestamp_ms;
    char cqis[100], sub_powers[2048];
    int len = 0, i;
    struct timeval ts;
    double sys_bw = 0;
    uint8_t N_RB_DL;
    LTE_DL_FRAME_PARMS *frame_parms = &phy_vars_eNB->lte_frame_parms;

    Mod_id = phy_vars_eNB->Mod_id;
    CC_id = phy_vars_eNB->CC_id;
    ref_timestamp_ms = phy_vars_eNB->ulsch_eNB[UE_id+1]->reference_timestamp_ms;
    
    for (i=0;i<13;i++) {
        len += sprintf(&cqis[len]," %d ", phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].DL_subband_cqi[0][i]);
    }
    len = 0;
    for (i=0;i<phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->active_subcarrier;i++) {
      len += sprintf(&sub_powers[len]," %d ", phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->subcarrier_power[i]);
    } 
    
    gettimeofday(&ts, NULL);
    current_timestamp_ms = ts.tv_sec * 1000 + ts.tv_usec / 1000;
  
    
      LOG_F(LOCALIZE, "PHY: [UE %x/%d -> eNB %d], timestamp %d, "
          "frame %d, subframe %d"
          "UE Tx power %d dBm, "
          "RSSI ant1 %d dBm, "
          "RSSI ant2 %d dBm, "
          "pwr ant1 %d dBm, "
          "pwr ant2 %d dBm, "
          "Rx gain %d dBm, "
          "TA %d, "
          "TA update %d, "
          "DL_CQI (%d,%d), "
          "Wideband CQI (%d,%d), "
          "DL Subband CQI[13] %s \n"
          "timestamp %d, (%d active subcarrier) %s \n"
          ,phy_vars_eNB->dlsch_eNB[(uint32_t)UE_id][0]->rnti, UE_id, Mod_id, current_timestamp_ms,
          frame,subframe,
          UE_tx_power_dB,
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UL_rssi[0],
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UL_rssi[1],
          dB_fixed(phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[0]),
          dB_fixed(phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[1]),
          phy_vars_eNB->rx_total_gain_eNB_dB,
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UE_timing_offset, // raw timing advance 1/sampling rate
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].timing_advance_update,
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].DL_cqi[0],phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].DL_cqi[1],
          phy_vars_eNB->PHY_measurements_eNB[Mod_id].wideband_cqi_dB[(uint32_t)UE_id][0],
          phy_vars_eNB->PHY_measurements_eNB[Mod_id].wideband_cqi_dB[(uint32_t)UE_id][1],
          cqis,
          current_timestamp_ms,
          phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->active_subcarrier, 
          sub_powers);
  
      N_RB_DL = frame_parms->N_RB_DL;
      switch (N_RB_DL) 
        {
        case 6:
          sys_bw = 1.92;
          break;
        case 25:
          sys_bw = 7.68;
          break;
        case 50:
          sys_bw = 15.36;
          break;
        case 100:
          sys_bw = 30.72;
          break;
       }  

      if ((current_timestamp_ms - ref_timestamp_ms > phy_vars_eNB->ulsch_eNB[UE_id+1]->aggregation_period_ms) && 
              (phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rss_list.size != 0)) {
          // check the size of one list to be sure there was a message transmitted during the defined aggregation period
          median_power = calculate_median(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rss_list);
          del(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rss_list);
          median_rssi = calculate_median(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rssi_list);
          del(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rssi_list);
          median_subcarrier_rss = calculate_median(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_subcarrier_rss_list);
          del(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_subcarrier_rss_list);
          median_TA = calculate_median(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_advance_list);
          del(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_advance_list);       
          median_TA_update = calculate_median(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_update_list);
          del(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_update_list);   

          double alpha = 2, power_distance, time_distance;
          power_distance = pow(10, ((UE_tx_power_dB - (median_subcarrier_rss - phy_vars_eNB->rx_total_gain_eNB_dB))/(20.0*alpha)));
          time_distance = (double) 299792458*(phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UE_timing_offset)/(sys_bw*1000000);

          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].distance.time_based = time_distance;
          phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].distance.power_based = power_distance;

          LOG_D(LOCALIZE, " PHY [UE %x/%d -> eNB %d], timestamp %d, "
            "frame %d, subframe %d "
            "UE Tx power %d dBm, "
            "median RSSI %d dBm, "
            "median Power %d dBm, "
            "Rx gain %d dBm, "
            "power estimated r = %0.3f, "
            " TA %d, update %d "
            "TA estimated r = %0.3f\n"
            ,phy_vars_eNB->dlsch_eNB[(uint32_t)UE_id][0]->rnti, UE_id, Mod_id, current_timestamp_ms, 
            frame, subframe, 
            UE_tx_power_dB,
            median_rssi,
            median_power,
            phy_vars_eNB->rx_total_gain_eNB_dB,
            power_distance,
            phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UE_timing_offset, median_TA_update, 
            time_distance); 

            initialize(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rss_list);
            initialize(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_subcarrier_rss_list);        
            initialize(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rssi_list);
            initialize(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_advance_list);
            initialize(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_update_list);
            
            // make the reference timestamp == current timestamp
            phy_vars_eNB->ulsch_eNB[UE_id+1]->reference_timestamp_ms = current_timestamp_ms;
            return 0;
      }
      else {
          avg_power = (dB_fixed(phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[0]) + dB_fixed(phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[1]))/2;
          avg_rssi = (phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UL_rssi[0] + phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UL_rssi[1])/2;

          push_front(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rss_list,avg_power);
          push_front(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_rssi_list,avg_rssi);
          for (i=0;i<phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->active_subcarrier;i++) {
              push_front(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_subcarrier_rss_list, phy_vars_eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->subcarrier_power[i]);
          }       
          push_front(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_advance_list, phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].UE_timing_offset);
          push_front(&phy_vars_eNB->ulsch_eNB[UE_id+1]->loc_timing_update_list, phy_vars_eNB->eNB_UE_stats[(uint32_t)UE_id].timing_advance_update);
          return -1;
      }      
}
#endif
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LTE_eNB_UE_stats* get_eNB_UE_stats(uint8_t Mod_id, uint8_t  CC_id,uint16_t rnti) {
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  int8_t UE_id;
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  if ((PHY_vars_eNB_g == NULL) || (PHY_vars_eNB_g[Mod_id] == NULL) || (PHY_vars_eNB_g[Mod_id][CC_id]==NULL)) {
    LOG_E(PHY,"get_eNB_UE_stats: No phy_vars_eNB found (or not allocated) for Mod_id %d,CC_id %d\n",Mod_id,CC_id);
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    return NULL;
  }
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  UE_id = find_ue(rnti, PHY_vars_eNB_g[Mod_id][CC_id]);
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  if (UE_id == -1) {
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    //    LOG_E(PHY,"get_eNB_UE_stats: UE with rnti %x not found\n",rnti);
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    return NULL;
  }
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  return(&PHY_vars_eNB_g[Mod_id][CC_id]->eNB_UE_stats[(uint32_t)UE_id]);
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}

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int8_t find_ue(uint16_t rnti, PHY_VARS_eNB *phy_vars_eNB) {
  uint8_t i;
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  for (i=0;i<NUMBER_OF_UE_MAX;i++) {
    if ((phy_vars_eNB->dlsch_eNB[i]) && 
	(phy_vars_eNB->dlsch_eNB[i][0]) && 
	(phy_vars_eNB->dlsch_eNB[i][0]->rnti==rnti)) {
      return(i);
    }
  }
#ifdef CBA  
  for (i=0; i<NUM_MAX_CBA_GROUP; i++){
    if ((phy_vars_eNB->ulsch_eNB[i]) && // ue J is the representative of group j
	(phy_vars_eNB->ulsch_eNB[i]->num_active_cba_groups) &&
	(phy_vars_eNB->ulsch_eNB[i]->cba_rnti[i]== rnti))
      return(i);
  }
#endif 
    
  return(-1);
}

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LTE_DL_FRAME_PARMS* get_lte_frame_parms(module_id_t Mod_id, uint8_t  CC_id){

  return(&PHY_vars_eNB_g[Mod_id][CC_id]->lte_frame_parms);

}

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MU_MIMO_mode *get_mu_mimo_mode (module_id_t Mod_id, uint8_t  CC_id, rnti_t rnti){
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  return(&PHY_vars_eNB_g[Mod_id][CC_id]->mu_mimo_mode[find_ue(rnti,PHY_vars_eNB_g[Mod_id][CC_id])]);
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}