openairinterface5g/openair1/SCHED/phy_procedures_lte_common.c

/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.0  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

/*! \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 "SCHED/defs.h"
#include "SCHED/extern.h"

#ifdef LOCALIZATION
#include <sys/time.h>
#endif

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) & 1023;
    } 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) & 1023;
        break;

      case 5:
        *subframe = 2;
        *frame = (current_frame+1) & 1023;
        break;

      case 9:
        *subframe = 7;
        *frame = (current_frame+1) & 1023;
        break;
      }
    } else if (frame_parms->tdd_config == 3) {
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
        *subframe = 2;
        *frame = (current_frame+1) & 1023;
        break;

      case 7:
        *subframe = 3;
        *frame = (current_frame+1) & 1023;
        break;

      case 8:
        *subframe = 4;
        *frame = (current_frame+1) & 1023;
        break;

      case 9:
        *subframe = 2;
        *frame = (current_frame+2) & 1023;
        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)
{
  if (frame_parms->frame_type == FDD) {
    /* always retransmit in n+8 */
    *subframe = current_subframe + 8;

    if (*subframe > 9) {
      *subframe = *subframe - 10;
      *frame = (current_frame + 1) & 1023;
    } 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) & 1023;
    } 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) & 1023;
    }
  }
}

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

  uint8_t ul_subframe=0;
  uint32_t ul_frame=0;

  if (frame_parms->frame_type ==FDD) {
    ul_subframe = (current_subframe>3) ? (current_subframe-4) : (current_subframe+6);
    ul_frame    = (current_subframe>3) ? ((frame+1)&1023) : 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);
      mac_xface->macphy_exit("get_Msg3_harq_pid: Unsupported TDD configuration");
      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)
{

  if (frame_parms->frame_type == FDD) {
    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 {
        LOG_E(PHY,"phy_procedures_lte_common.c/ul_ACK_subframe2_dl_subframe: illegal subframe %d for tdd_config %d\n",
              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)
{

  if (frame_parms->frame_type == FDD) {
    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
uint8_t get_ack(LTE_DL_FRAME_PARMS *frame_parms,
                harq_status_t *harq_ack,
                unsigned char subframe,
                unsigned char *o_ACK)
{


  uint8_t status=0;
  uint8_t subframe_dl;

  //  printf("get_ack: SF %d\n",subframe);
  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;
    //printf("get_ack: Getting ACK/NAK for PDSCH (subframe %d) => %d\n",subframe_dl,o_ACK[0]);
  } 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);
        //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);
      } 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);
        //printf("Subframe 3, TDD config 3: harq_ack[7] = %d,harq_ack[8] = %d\n",harq_ack[7].ack,harq_ack[8].ack);
        //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[0].send_harq_status == 1)
          o_ACK[0] = harq_ack[0].ack;

        status = harq_ack[9].send_harq_status + (harq_ack[0].send_harq_status<<1);
        //printf("Subframe 4, TDD config 3: harq_ack[9] = %d,harq_ack[0] = %d\n",harq_ack[9].ack,harq_ack[0].ack);
      } 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);
}

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};
// This is part of the PUCCH allocation procedure (see Section 10.1 36.213)
uint16_t get_Np(uint8_t N_RB_DL,uint8_t nCCE,uint8_t plus1)
{
  uint8_t *Np;

  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
  if (frame_parms->frame_type == FDD)
    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);
    mac_xface->macphy_exit("subframe x Unsupported TDD configuration");
    return(255);

  }
}

lte_subframe_t get_subframe_direction(uint8_t Mod_id,uint8_t CC_id,uint8_t subframe)
{

  return(subframe_select(&PHY_vars_eNB_g[Mod_id][CC_id]->frame_parms,subframe));

}

uint8_t phich_subframe_to_harq_pid(LTE_DL_FRAME_PARMS *frame_parms,uint32_t frame,uint8_t subframe)
{

  //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)
{

  if (frame_parms->frame_type == FDD) {
    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);
}


#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;
  int32_t 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 = &eNB->frame_parms;

  Mod_id = eNB->Mod_id;
  CC_id = eNB->CC_id;
  ref_timestamp_ms = eNB->ulsch[UE_id+1]->reference_timestamp_ms;

  for (i=0; i<13; i++) {
    len += sprintf(&cqis[len]," %d ", eNB->UE_stats[(uint32_t)UE_id].DL_subband_cqi[0][i]);
  }

  len = 0;

  for (i=0; i<eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->active_subcarrier; i++) {
    len += sprintf(&sub_powers[len]," %d ", 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_D(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 dB, "
        "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"
        eNB->dlsch[(uint32_t)UE_id][0]->rnti, UE_id, Mod_id, current_timestamp_ms,
        frame,subframe,
        UE_tx_power_dB,
        eNB->UE_stats[(uint32_t)UE_id].UL_rssi[0],
        eNB->UE_stats[(uint32_t)UE_id].UL_rssi[1],
        dB_fixed(eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[0]),
        dB_fixed(eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[1]),
        eNB->rx_total_gain_eNB_dB,
        eNB->UE_stats[(uint32_t)UE_id].UE_timing_offset, // raw timing advance 1/sampling rate
        eNB->UE_stats[(uint32_t)UE_id].timing_advance_update,
        eNB->UE_stats[(uint32_t)UE_id].DL_cqi[0],eNB->UE_stats[(uint32_t)UE_id].DL_cqi[1],
        eNB->measurements[Mod_id].wideband_cqi_dB[(uint32_t)UE_id][0],
        eNB->measurements[Mod_id].wideband_cqi_dB[(uint32_t)UE_id][1],
        cqis);
  LOG_D(LOCALIZE, " PHY: timestamp %d, (%d active subcarrier) %s \n",
        current_timestamp_ms,
        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 > eNB->ulsch[UE_id+1]->aggregation_period_ms)) {
    // check the size of one list to be sure there was a message transmitted during the defined aggregation period

    // make the reference timestamp == current timestamp
    eNB->ulsch[UE_id+1]->reference_timestamp_ms = current_timestamp_ms;
    int i;

    for (i=0; i<10; i++) {
      median_power = calculate_median(&eNB->ulsch[UE_id+1]->loc_rss_list[i]);
      del(&eNB->ulsch[UE_id+1]->loc_rss_list[i]);
      median_rssi = calculate_median(&eNB->ulsch[UE_id+1]->loc_rssi_list[i]);
      del(&eNB->ulsch[UE_id+1]->loc_rssi_list[i]);
      median_subcarrier_rss = calculate_median(&eNB->ulsch[UE_id+1]->loc_subcarrier_rss_list[i]);
      del(&eNB->ulsch[UE_id+1]->loc_subcarrier_rss_list[i]);
      median_TA = calculate_median(&eNB->ulsch[UE_id+1]->loc_timing_advance_list[i]);
      del(&eNB->ulsch[UE_id+1]->loc_timing_advance_list[i]);
      median_TA_update = calculate_median(&eNB->ulsch[UE_id+1]->loc_timing_update_list[i]);
      del(&eNB->ulsch[UE_id+1]->loc_timing_update_list[i]);

      if (median_power != 0)
        push_front(&eNB->ulsch[UE_id+1]->tot_loc_rss_list,median_power);

      if (median_rssi != 0)
        push_front(&eNB->ulsch[UE_id+1]->tot_loc_rssi_list,median_rssi);

      if (median_subcarrier_rss != 0)
        push_front(&eNB->ulsch[UE_id+1]->tot_loc_subcarrier_rss_list,median_subcarrier_rss);

      if (median_TA != 0)
        push_front(&eNB->ulsch[UE_id+1]->tot_loc_timing_advance_list,median_TA);

      if (median_TA_update != 0)
        push_front(&eNB->ulsch[UE_id+1]->tot_loc_timing_update_list,median_TA_update);

      initialize(&eNB->ulsch[UE_id+1]->loc_rss_list[i]);
      initialize(&eNB->ulsch[UE_id+1]->loc_subcarrier_rss_list[i]);
      initialize(&eNB->ulsch[UE_id+1]->loc_rssi_list[i]);
      initialize(&eNB->ulsch[UE_id+1]->loc_timing_advance_list[i]);
      initialize(&eNB->ulsch[UE_id+1]->loc_timing_update_list[i]);
    }

    median_power = calculate_median(&eNB->ulsch[UE_id+1]->tot_loc_rss_list);
    del(&eNB->ulsch[UE_id+1]->tot_loc_rss_list);
    median_rssi = calculate_median(&eNB->ulsch[UE_id+1]->tot_loc_rssi_list);
    del(&eNB->ulsch[UE_id+1]->tot_loc_rssi_list);
    median_subcarrier_rss = calculate_median(&eNB->ulsch[UE_id+1]->tot_loc_subcarrier_rss_list);
    del(&eNB->ulsch[UE_id+1]->tot_loc_subcarrier_rss_list);
    median_TA = calculate_median(&eNB->ulsch[UE_id+1]->tot_loc_timing_advance_list);
    del(&eNB->ulsch[UE_id+1]->tot_loc_timing_advance_list);
    median_TA_update = calculate_median(&eNB->ulsch[UE_id+1]->tot_loc_timing_update_list);
    del(&eNB->ulsch[UE_id+1]->tot_loc_timing_update_list);

    initialize(&eNB->ulsch[UE_id+1]->tot_loc_rss_list);
    initialize(&eNB->ulsch[UE_id+1]->tot_loc_subcarrier_rss_list);
    initialize(&eNB->ulsch[UE_id+1]->tot_loc_rssi_list);
    initialize(&eNB->ulsch[UE_id+1]->tot_loc_timing_advance_list);
    initialize(&eNB->ulsch[UE_id+1]->tot_loc_timing_update_list);

    double alpha = 2, power_distance, time_distance;
    // distance = 10^((Ptx - Prx - A)/10alpha), A is a constance experimentally evaluated
    // A includes the rx gain (eNB->rx_total_gain_eNB_dB) and hardware calibration
    power_distance = pow(10, ((UE_tx_power_dB - median_power - eNB->rx_total_gain_eNB_dB + 133)/(10.0*alpha)));
    /* current measurements shows constant UE_timing_offset = 18
       and timing_advance_update = 11 at 1m. at 5m, timing_advance_update = 12*/
    //time_distance = (double) 299792458*(eNB->UE_stats[(uint32_t)UE_id].timing_advance_update)/(sys_bw*1000000);
    time_distance = (double) abs(eNB->UE_stats[(uint32_t)UE_id].timing_advance_update - 11) * 4.89;//  (3 x 108 x 1 / (15000 x 2048)) / 2 = 4.89 m

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

    LOG_D(LOCALIZE, " PHY agg [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 dB, "
          "power estimated r = %0.3f, "
          " TA %d, update %d "
          "TA estimated r = %0.3f\n"
          ,eNB->dlsch[(uint32_t)UE_id][0]->rnti, UE_id, Mod_id, current_timestamp_ms,
          frame, subframe,
          UE_tx_power_dB,
          median_rssi,
          median_power,
          eNB->rx_total_gain_eNB_dB,
          power_distance,
          eNB->UE_stats[(uint32_t)UE_id].UE_timing_offset, median_TA_update,
          time_distance);

    return 0;
  } else {
    avg_power = (dB_fixed(eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[0]) + dB_fixed(eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->ulsch_power[1]))/2;
    avg_rssi = (eNB->UE_stats[(uint32_t)UE_id].UL_rssi[0] + eNB->UE_stats[(uint32_t)UE_id].UL_rssi[1])/2;

    push_front(&eNB->ulsch[UE_id+1]->loc_rss_list[subframe],avg_power);
    push_front(&eNB->ulsch[UE_id+1]->loc_rssi_list[subframe],avg_rssi);

    for (i=0; i<eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->active_subcarrier; i++) {
      push_front(&eNB->ulsch[UE_id+1]->loc_subcarrier_rss_list[subframe], eNB->lte_eNB_pusch_vars[(uint32_t)UE_id]->subcarrier_power[i]);
    }

    push_front(&eNB->ulsch[UE_id+1]->loc_timing_advance_list[subframe], eNB->UE_stats[(uint32_t)UE_id].UE_timing_offset);
    push_front(&eNB->ulsch[UE_id+1]->loc_timing_update_list[subframe], eNB->UE_stats[(uint32_t)UE_id].timing_advance_update);
    return -1;
  }
}
#endif
LTE_eNB_UE_stats* get_UE_stats(uint8_t Mod_id, uint8_t  CC_id,uint16_t rnti)
{
  int8_t UE_id;

  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_UE_stats: No eNB found (or not allocated) for Mod_id %d,CC_id %d\n",Mod_id,CC_id);
    return NULL;
  }

  UE_id = find_ue(rnti, PHY_vars_eNB_g[Mod_id][CC_id]);

  if (UE_id == -1) {
    //    LOG_E(PHY,"get_UE_stats: UE with rnti %x not found\n",rnti);
    return NULL;
  }

  return(&PHY_vars_eNB_g[Mod_id][CC_id]->UE_stats[(uint32_t)UE_id]);
}

int8_t find_ue(uint16_t rnti, PHY_VARS_eNB *eNB)
{
  uint8_t i;

  for (i=0; i<NUMBER_OF_UE_MAX; i++) {
    if ((eNB->dlsch[i]) &&
        (eNB->dlsch[i][0]) &&
        (eNB->dlsch[i][0]->rnti==rnti)) {
      return(i);
    }
  }

#ifdef CBA

  for (i=0; i<NUM_MAX_CBA_GROUP; i++) {
    if ((eNB->ulsch[i]) && // ue J is the representative of group j
        (eNB->ulsch[i]->num_active_cba_groups) &&
        (eNB->ulsch[i]->cba_rnti[i]== rnti))
      return(i);
  }

#endif

  return(-1);
}

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]->frame_parms);

}

MU_MIMO_mode *get_mu_mimo_mode (module_id_t Mod_id, uint8_t  CC_id, rnti_t rnti)
{
  int8_t UE_id = find_ue( rnti, PHY_vars_eNB_g[Mod_id][CC_id] );

  if (UE_id == -1)
    return 0;

  return &PHY_vars_eNB_g[Mod_id][CC_id]->mu_mimo_mode[UE_id];
}