phy_procedures_lte_eNb.c 64.5 KB
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/*
 * 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
 */
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/*! \file phy_procedures_lte_eNB.c
 * \brief Implementation of eNB procedures from 36.213 LTE specifications
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 * \author R. Knopp, F. Kaltenberger, N. Nikaein, X. Foukas
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 * \date 2011
 * \version 0.1
 * \company Eurecom
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 * \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr,navid.nikaein@eurecom.fr, x.foukas@sms.ed.ac.uk
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 * \note
 * \warning
 */

#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
#include "SCHED/extern.h"
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#include "nfapi_interface.h"
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#include "fapi_l1.h"
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#include "UTIL/LOG/log.h"
#include "UTIL/LOG/vcd_signal_dumper.h"

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#include "T.h"

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#include "assertions.h"
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#include "msc.h"
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#include <time.h>

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#if defined(ENABLE_ITTI)
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#   include "intertask_interface.h"
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#endif

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void pmch_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,PHY_VARS_RN *rn,relaying_type_t r_type) {
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#if defined(Rel10) || defined(Rel14)
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  MCH_PDU *mch_pduP=NULL;
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  MCH_PDU  mch_pdu;
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  //  uint8_t sync_area=255;
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#endif
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  int subframe = proc->subframe_tx;
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  AssertFatal(1==0,"pmch not tested for the moment, exiting\n");

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  // This is DL-Cell spec pilots in Control region
  generate_pilots_slot(eNB,
		       eNB->common_vars.txdataF,
		       AMP,
		       subframe<<1,1);

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#if defined(Rel10) || defined(Rel14)
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  // if mcch is active, send regardless of the node type: eNB or RN
  // when mcch is active, MAC sched does not allow MCCH and MTCH multiplexing
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  /*
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  mch_pduP = mac_xface->get_mch_sdu(eNB->Mod_id,
				    eNB->CC_id,
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				    proc->frame_tx,
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				    subframe);
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  */
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  switch (r_type) {
  case no_relay:
    if ((mch_pduP->Pdu_size > 0) && (mch_pduP->sync_area == 0)) // TEST: only transmit mcch for sync area 0
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      LOG_D(PHY,"[eNB%"PRIu8"] Frame %d subframe %d : Got MCH pdu for MBSFN (MCS %"PRIu8", TBS %d) \n",
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	    eNB->Mod_id,proc->frame_tx,subframe,mch_pduP->mcs,
	    eNB->dlsch_MCH->harq_processes[0]->TBS>>3);
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    else {
      LOG_D(PHY,"[DeNB %"PRIu8"] Frame %d subframe %d : Do not transmit MCH pdu for MBSFN sync area %"PRIu8" (%s)\n",
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	    eNB->Mod_id,proc->frame_tx,subframe,mch_pduP->sync_area,
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	    (mch_pduP->Pdu_size == 0)? "Empty MCH PDU":"Let RN transmit for the moment");
      mch_pduP = NULL;
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    }
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    break;
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  case multicast_relay:
    if ((mch_pduP->Pdu_size > 0) && ((mch_pduP->mcch_active == 1) || mch_pduP->msi_active==1)) {
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      LOG_D(PHY,"[RN %"PRIu8"] Frame %d subframe %d: Got the MCH PDU for MBSFN  sync area %"PRIu8" (MCS %"PRIu8", TBS %"PRIu16")\n",
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	    rn->Mod_id,rn->frame, subframe,
	    mch_pduP->sync_area,mch_pduP->mcs,mch_pduP->Pdu_size);
    } else if (rn->mch_avtive[subframe%5] == 1) { // SF2 -> SF7, SF3 -> SF8
      mch_pduP= &mch_pdu;
      memcpy(&mch_pduP->payload, // could be a simple copy
	     rn->dlsch_rn_MCH[subframe%5]->harq_processes[0]->b,
	     rn->dlsch_rn_MCH[subframe%5]->harq_processes[0]->TBS>>3);
      mch_pduP->Pdu_size = (uint16_t) (rn->dlsch_rn_MCH[subframe%5]->harq_processes[0]->TBS>>3);
      mch_pduP->mcs = rn->dlsch_rn_MCH[subframe%5]->harq_processes[0]->mcs;
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      LOG_D(PHY,"[RN %"PRIu8"] Frame %d subframe %d: Forward the MCH PDU for MBSFN received on SF %d sync area %"PRIu8" (MCS %"PRIu8", TBS %"PRIu16")\n",
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	    rn->Mod_id,rn->frame, subframe,subframe%5,
	    rn->sync_area[subframe%5],mch_pduP->mcs,mch_pduP->Pdu_size);
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    } else {
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      mch_pduP=NULL;
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    }
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    rn->mch_avtive[subframe]=0;
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    break;
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  default:
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    LOG_W(PHY,"[eNB %"PRIu8"] Frame %d subframe %d: unknown relaying type %d \n",
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	  eNB->Mod_id,proc->frame_tx,subframe,r_type);
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    mch_pduP=NULL;
    break;
  }// switch
  
  if (mch_pduP) {
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    fill_eNB_dlsch_MCH(eNB,mch_pduP->mcs,1,0);
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    // Generate PMCH
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    generate_mch(eNB,proc,(uint8_t*)mch_pduP->payload);
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  } else {
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    LOG_D(PHY,"[eNB/RN] Frame %d subframe %d: MCH not generated \n",proc->frame_tx,subframe);
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  }
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#endif
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}
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void common_signal_procedures (PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc) {
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  LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
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  int **txdataF = eNB->common_vars.txdataF;
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  uint8_t *pbch_pdu=&eNB->pbch_pdu[0];
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  int subframe = proc->subframe_tx;
  int frame = proc->frame_tx;
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  LOG_D(PHY,"common_signal_procedures: frame %d, subframe %d\n",frame,subframe); 

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  // generate Cell-Specific Reference Signals for both slots
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_RS_TX,1);
  generate_pilots_slot(eNB,
		       txdataF,
		       AMP,
		       subframe<<1,0);
  // check that 2nd slot is for DL
  if (subframe_select(fp,subframe) == SF_DL)
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    generate_pilots_slot(eNB,
			 txdataF,
			 AMP,
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			 (subframe<<1)+1,0);
  
  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_RS_TX,0);
      
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  // First half of PSS/SSS (FDD, slot 0)
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  if (subframe == 0) {
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    if (fp->frame_type == FDD) {
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      generate_pss(txdataF,
		   AMP,
		   fp,
		   (fp->Ncp==NORMAL) ? 6 : 5,
		   0);
      generate_sss(txdataF,
		   AMP,
		   fp,
		   (fp->Ncp==NORMAL) ? 5 : 4,
		   0);
      
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    }
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    /// First half of SSS (TDD, slot 1)
    
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    if (fp->frame_type == TDD) {
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      generate_sss(txdataF,
		   AMP,
		   fp,
		   (fp->Ncp==NORMAL) ? 6 : 5,
		   1);
    }
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    // generate PBCH (Physical Broadcast CHannel) info

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    /// generate PBCH
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    if ((frame&3)==0) {
      AssertFatal(eNB->pbch_configured==1,"PBCH was not configured by MAC\n");
      eNB->pbch_configured=0;
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    }
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    generate_pbch(&eNB->pbch,
		  txdataF,
		  AMP,
		  fp,
		  pbch_pdu,
		  frame&3);
  
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  }
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  else if ((subframe == 1) &&
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	   (fp->frame_type == TDD)){
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    generate_pss(txdataF,
		 AMP,
		 fp,
		 2,
		 2);
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  }
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  // Second half of PSS/SSS (FDD, slot 10)
  else if ((subframe == 5) && 
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	   (fp->frame_type == FDD)) {
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    generate_pss(txdataF,
		 AMP,
		 &eNB->frame_parms,
		 (fp->Ncp==NORMAL) ? 6 : 5,
		 10);
    generate_sss(txdataF,
		 AMP,
		 &eNB->frame_parms,
		 (fp->Ncp==NORMAL) ? 5 : 4,
		 10);
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  }
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  //  Second-half of SSS (TDD, slot 11)
  else if ((subframe == 5) &&
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	   (fp->frame_type == TDD)) {
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    generate_sss(txdataF,
		 AMP,
		 fp,
		 (fp->Ncp==NORMAL) ? 6 : 5,
		 11);
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  }
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  // Second half of PSS (TDD, slot 12)
  else if ((subframe == 6) &&
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	   (fp->frame_type == TDD)) { 
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    generate_pss(txdataF,
		 AMP,
		 fp,
		 2,
		 12);
  }
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}
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void pdsch_procedures(PHY_VARS_eNB *eNB,
		      eNB_rxtx_proc_t *proc,
		      int harq_pid,
		      LTE_eNB_DLSCH_t *dlsch, 
		      LTE_eNB_DLSCH_t *dlsch1,
		      LTE_eNB_UE_stats *ue_stats,
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		      int ra_flag) {
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  int frame=proc->frame_tx;
  int subframe=proc->subframe_tx;
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  LTE_DL_eNB_HARQ_t *dlsch_harq=dlsch->harq_processes[harq_pid];
  int input_buffer_length = dlsch_harq->TBS/8;
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  LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
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  if (dlsch->rnti == 0x02) {//frame < 200) {
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    LOG_I(PHY,
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	  "[eNB %"PRIu8"][PDSCH %"PRIx16"/%"PRIu8"] Frame %d, subframe %d: Generating PDSCH/DLSCH with input size = %"PRIu16", pdsch_start %d, G %d, nb_rb %"PRIu16", rb0 %x, rb1 %x, TBS %"PRIu16", pmi_alloc %"PRIx64", rv %"PRIu8" (round %"PRIu8")\n",
	  eNB->Mod_id, dlsch->rnti,harq_pid,
	  frame, subframe, input_buffer_length, dlsch_harq->pdsch_start,
	  get_G(fp,
		dlsch_harq->nb_rb,
		dlsch_harq->rb_alloc,
		dlsch_harq->Qm,
		dlsch_harq->Nl,
		dlsch_harq->pdsch_start,
		frame,
		subframe,
		dlsch_harq->mimo_mode==TM7?7:0),
	  dlsch_harq->nb_rb,
	  dlsch_harq->rb_alloc[0],
	  dlsch_harq->rb_alloc[1],
	  dlsch_harq->TBS,
	  pmi2hex_2Ar1(dlsch_harq->pmi_alloc),
	  dlsch_harq->rvidx,
	  dlsch_harq->round);
  }    
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#if defined(MESSAGE_CHART_GENERATOR_PHY)
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  MSC_LOG_TX_MESSAGE(
		     MSC_PHY_ENB,MSC_PHY_UE,
		     NULL,0,
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		     "%05u:%02u PDSCH/DLSCH input size = %"PRIu16", G %d, nb_rb %"PRIu16", TBS %"PRIu16", pmi_alloc %"PRIx16", rv %"PRIu8" (round %"PRIu8")",
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		     frame, subframe,
		     input_buffer_length,
		     get_G(fp,
			   dlsch_harq->nb_rb,
			   dlsch_harq->rb_alloc,
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			   dlsch_harq->Qm,
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			   dlsch_harq->Nl,
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			   dlsch_harq->pdsch_start,
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			   frame,
			   subframe,
			   dlsch_harq->mimo_mode==TM7?7:0),
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		     dlsch_harq->nb_rb,
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		     dlsch_harq->TBS,
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		     pmi2hex_2Ar1(dlsch_harq->pmi_alloc),
		     dlsch_harq->rvidx,
		     dlsch_harq->round);
#endif
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  if (ue_stats) ue_stats->dlsch_sliding_cnt++;
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  if (dlsch_harq->round == 0) {
    if (ue_stats)
      ue_stats->dlsch_trials[harq_pid][0]++;
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  } else {
    ue_stats->dlsch_trials[harq_pid][dlsch_harq->round]++;
#ifdef DEBUG_PHY_PROC
#ifdef DEBUG_DLSCH
    LOG_D(PHY,"[eNB] This DLSCH is a retransmission\n");
#endif
#endif
  }
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  LOG_D(PHY,"Generating DLSCH/PDSCH %d\n",ra_flag);
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  // 36-212 
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  start_meas(&eNB->dlsch_encoding_stats);
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  AssertFatal(dlsch_harq->pdu!=NULL,"dlsch_harq->pdu == NULL (rnti %x)\n",dlsch->rnti);
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  eNB->te(eNB,
	  dlsch_harq->pdu,
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	  dlsch_harq->pdsch_start,
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	  dlsch,
	  frame,subframe,
	  &eNB->dlsch_rate_matching_stats,
	  &eNB->dlsch_turbo_encoding_stats,
	  &eNB->dlsch_interleaving_stats);
  stop_meas(&eNB->dlsch_encoding_stats);
  // 36-211
  start_meas(&eNB->dlsch_scrambling_stats);
  dlsch_scrambling(fp,
		   0,
		   dlsch,
		   harq_pid,
		   get_G(fp,
			 dlsch_harq->nb_rb,
			 dlsch_harq->rb_alloc,
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			 dlsch_harq->Qm,
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			 dlsch_harq->Nl,
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			 dlsch_harq->pdsch_start,
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			 frame,subframe,
			 0),
		   0,
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		   frame,
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		   subframe<<1);
  stop_meas(&eNB->dlsch_scrambling_stats);
  
  start_meas(&eNB->dlsch_modulation_stats);
  
  
  dlsch_modulation(eNB,
		   eNB->common_vars.txdataF,
		   AMP,
		   subframe,
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		   dlsch_harq->pdsch_start,
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		   dlsch,
		   dlsch1);
  
  stop_meas(&eNB->dlsch_modulation_stats);
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  dlsch->active = 0;
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  dlsch_harq->round++;
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}
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void phy_procedures_eNB_TX(PHY_VARS_eNB *eNB,
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			   eNB_rxtx_proc_t *proc,
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                           relaying_type_t r_type,
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			   PHY_VARS_RN *rn,
			   int do_meas)
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{
  UNUSED(rn);
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  int frame=proc->frame_tx;
  int subframe=proc->subframe_tx;
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  uint32_t i,aa;
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  uint8_t harq_pid;
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  int8_t UE_id=0;
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  uint8_t num_pdcch_symbols=0;
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  uint8_t num_dci=0;
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  uint8_t ul_subframe;
  uint32_t ul_frame;
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  LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
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  LTE_UL_eNB_HARQ_t *ulsch_harq;
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  int offset = eNB->CC_id;//proc == &eNB->proc.proc_rxtx[0] ? 0 : 1;
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  if ((fp->frame_type == TDD) && (subframe_select(fp,subframe)==SF_UL)) return;
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_PROCEDURES_ENB_TX+offset,1);
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  if (do_meas==1) start_meas(&eNB->phy_proc_tx);
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  // clear the transmit data array for the current subframe
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  for (aa=0; aa<fp->nb_antenna_ports_eNB; aa++) {      
    memset(&eNB->common_vars.txdataF[aa][subframe*fp->ofdm_symbol_size*(fp->symbols_per_tti)],
	   0,fp->ofdm_symbol_size*(fp->symbols_per_tti)*sizeof(int32_t));
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  }
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  if (is_pmch_subframe(frame,subframe,fp)) {
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    pmch_procedures(eNB,proc,rn,r_type);
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  }
  else {
    // this is not a pmch subframe, so generate PSS/SSS/PBCH
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    common_signal_procedures(eNB,proc);
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  }
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  // clear existing ulsch dci allocations before applying info from MAC  (this is table
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  ul_subframe = pdcch_alloc2ul_subframe(fp,subframe);
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  ul_frame = pdcch_alloc2ul_frame(fp,frame,subframe);
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  // clear previous allocation information for all UEs
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  for (i=0; i<NUMBER_OF_UE_MAX; i++) {
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    if (eNB->dlsch[i][0])
      eNB->dlsch[i][0]->subframe_tx[subframe] = 0;
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  }
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  /* save old HARQ information needed for PHICH generation */
  for (i=0; i<NUMBER_OF_UE_MAX; i++) {
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    harq_pid = subframe2harq_pid(fp,ul_frame,ul_subframe);
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    if (eNB->ulsch[i]) {
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      ulsch_harq = eNB->ulsch[i]->harq_processes[harq_pid];

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      /* Store first_rb and n_DMRS for correct PHICH generation below.
       * For PHICH generation we need "old" values of last scheduling
       * for this HARQ process. 'generate_eNB_dlsch_params' below will
       * overwrite first_rb and n_DMRS and 'generate_phich_top', done
       * after 'generate_eNB_dlsch_params', would use the "new" values
       * instead of the "old" ones.
       *
       * This has been tested for FDD only, may be wrong for TDD.
       *
       * TODO: maybe we should restructure the code to be sure it
       *       is done correctly. The main concern is if the code
       *       changes and first_rb and n_DMRS are modified before
       *       we reach here, then the PHICH processing will be wrong,
       *       using wrong first_rb and n_DMRS values to compute
       *       ngroup_PHICH and nseq_PHICH.
       *
       * TODO: check if that works with TDD.
       */
      if ((subframe_select(fp,ul_subframe)==SF_UL) ||
          (fp->frame_type == FDD)) {
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        ulsch_harq->previous_first_rb = ulsch_harq->first_rb;
        ulsch_harq->previous_n_DMRS   = ulsch_harq->n_DMRS;
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      }
    }
  }

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  //  num_pdcch_symbols = DCI_pdu->num_pdcch_symbols;
  num_pdcch_symbols = eNB->pdcch_vars[subframe&1].num_pdcch_symbols;
  num_dci           = eNB->pdcch_vars[subframe&1].num_dci;
  //  LOG_D(PHY,"num_pdcch_symbols %"PRIu8",(dci common %"PRIu8", dci uespec %"PRIu8"\n",num_pdcch_symbols,
  //        DCI_pdu->Num_common_dci,DCI_pdu->Num_ue_spec_dci);
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  LOG_D(PHY,"num_pdcch_symbols %"PRIu8",(number dci %"PRIu8"\n",num_pdcch_symbols,
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	num_dci);
  VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME(VCD_SIGNAL_DUMPER_VARIABLES_DCI_INFO,num_pdcch_symbols);
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  VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME(VCD_SIGNAL_DUMPER_VARIABLES_DCI_INFO,(frame*10)+subframe);

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  if (num_dci > 0)
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    LOG_D(PHY,"[eNB %"PRIu8"] Frame %d, subframe %d: Calling generate_dci_top (pdcch) (num_dci %"PRIu8")\n",eNB->Mod_id,frame, subframe,
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	  num_dci);
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  generate_dci_top(num_pdcch_symbols,
		   num_dci,
		   &eNB->pdcch_vars[subframe&1].dci_alloc[0],
		   0,
		   AMP,
		   fp,
		   eNB->common_vars.txdataF,
		   subframe);
  
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PDCCH_TX,0);
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  // Now scan UE specific DLSCH
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  LTE_eNB_DLSCH_t *dlsch0,*dlsch1;
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  for (UE_id=0; UE_id<NUMBER_OF_UE_MAX; UE_id++)
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    {
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      dlsch0 = eNB->dlsch[(uint8_t)UE_id][0]; 
      dlsch1 = eNB->dlsch[(uint8_t)UE_id][1]; 

      if ((dlsch0)&&
	  (dlsch0->rnti>0)&&
	  (dlsch0->active == 1)) {
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	// get harq_pid
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	harq_pid = dlsch0->harq_ids[subframe];
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	AssertFatal(harq_pid>=0,"harq_pid is negative\n");
	// generate pdsch
	pdsch_procedures(eNB,
			 proc,
			 harq_pid,
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			 dlsch0,
			 dlsch1,
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			 &eNB->UE_stats[(uint32_t)UE_id],
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			 0);
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      }
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      else if ((dlsch0)&&
	       (dlsch0->rnti>0)&&
	       (dlsch0->active == 0)) {
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	// clear subframe TX flag since UE is not scheduled for PDSCH in this subframe (so that we don't look for PUCCH later)
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	dlsch0->subframe_tx[subframe]=0;
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      }
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    }
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  generate_phich_top(eNB,
		     proc,
		     AMP);
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_PROCEDURES_ENB_TX+offset,0);
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  if (do_meas==1) stop_meas(&eNB->phy_proc_tx);
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}

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void prach_procedures(PHY_VARS_eNB *eNB,
#ifdef Rel14
		      int br_flag
#endif
		      ) {
  uint16_t max_preamble[4],max_preamble_energy[4],max_preamble_delay[4];
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  uint16_t i;
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  int frame,subframe;
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  LTE_eNB_PRACH *prach_vars=NULL;

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#ifdef Rel14
  if (br_flag==1) {
    subframe = eNB->proc.subframe_prach_br;
    frame = eNB->proc.frame_prach_br;
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    pthread_mutex_lock(&eNB->UL_INFO_mutex);
    eNB->UL_INFO.rach_ind_br.number_of_preambles=0;
    pthread_mutex_unlock(&eNB->UL_INFO_mutex);
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  }
  else
#endif
    {
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      pthread_mutex_lock(&eNB->UL_INFO_mutex);
      eNB->UL_INFO.rach_ind.number_of_preambles=0;
      pthread_mutex_unlock(&eNB->UL_INFO_mutex);
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      subframe = eNB->proc.subframe_prach;
      frame = eNB->proc.frame_prach;
    }
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  RU_t *ru;
  int aa=0;
  int ru_aa;
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PRACH_RX,1);
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  for (i=0;i<eNB->num_RU;i++) {
    ru=eNB->RU_list[i];
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    for (ru_aa=0,aa=0;ru_aa<ru->nb_rx;ru_aa++,aa++) {
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      eNB->prach_vars.rxsigF[0][aa] = eNB->RU_list[i]->prach_rxsigF[ru_aa];
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#ifdef Rel14
      int ce_level;

      if (br_flag==1)
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	for (ce_level=0;ce_level<4;ce_level++) eNB->prach_vars_br.rxsigF[ce_level][aa] = eNB->RU_list[i]->prach_rxsigF_br[ce_level][ru_aa];
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#endif
    }
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  }
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  rx_prach(eNB,
	   eNB->RU_list[0],
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	   &max_preamble[0],
	   &max_preamble_energy[0],
	   &max_preamble_delay[0],
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	   frame,
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	   0
#ifdef Rel14
	   ,br_flag
#endif
	   );
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  //#ifdef DEBUG_PHY_PROC
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  LOG_D(PHY,"[RAPROC] Frame %d, subframe %d : Most likely preamble %d, energy %d dB delay %d\n",
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        frame,subframe,
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	max_preamble[0],
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        max_preamble_energy[0]/10,
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        max_preamble_delay[0]);
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  //q#endif
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#ifdef Rel14
  if (br_flag==1) {
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    prach_vars = &eNB->prach_vars_br;
    int prach_mask;
      
    prach_mask = is_prach_subframe(&eNB->frame_parms,eNB->proc.frame_prach_br,eNB->proc.subframe_prach_br);
    
    eNB->UL_INFO.rach_ind_br.preamble_list                              = eNB->preamble_list_br;
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    int ind=0;
    int ce_level=0;
    /* Save for later, it doesn't work    
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    for (int ind=0,ce_level=0;ce_level<4;ce_level++) {
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      if ((eNB->frame_parms.prach_emtc_config_common.prach_ConfigInfo.prach_CElevel_enable[ce_level]==1)&&
	  (prach_mask&(1<<(1+ce_level)) > 0) && // prach is active and CE level has finished its repetitions
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	  (eNB->prach_vars_br.repetition_number[ce_level]==
	   eNB->frame_parms.prach_emtc_config_common.prach_ConfigInfo.prach_numRepetitionPerPreambleAttempt[ce_level])) {
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    */ 
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    if (eNB->frame_parms.prach_emtc_config_common.prach_ConfigInfo.prach_CElevel_enable[0]==1){ 
      if (max_preamble_energy[0] > 350) {
	eNB->UL_INFO.rach_ind_br.number_of_preambles++;
	
	eNB->preamble_list_br[ind].preamble_rel8.timing_advance        = max_preamble_delay[ind];//
	eNB->preamble_list_br[ind].preamble_rel8.preamble              = max_preamble[ind];
	// note: fid is implicitly 0 here, this is the rule for eMTC RA-RNTI from 36.321, Section 5.1.4
	eNB->preamble_list_br[ind].preamble_rel8.rnti                  = 1+subframe+(eNB->prach_vars_br.first_frame[ce_level]%40);  
	eNB->preamble_list_br[ind].instance_length                     = 0; //don't know exactly what this is
	eNB->preamble_list_br[ind].preamble_rel13.rach_resource_type   = 1+ce_level;  // CE Level
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	LOG_D(PHY,"Filling NFAPI indication for RACH %d CELevel %d (mask %x) : TA %d, Preamble %d, rnti %x, rach_resource_type %d\n",
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	      ind,
	      ce_level,
	      prach_mask,
	      eNB->preamble_list_br[ind].preamble_rel8.timing_advance,
	      eNB->preamble_list_br[ind].preamble_rel8.preamble,
	      eNB->preamble_list_br[ind].preamble_rel8.rnti,
	      eNB->preamble_list_br[ind].preamble_rel13.rach_resource_type);
      }
      /*
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	ind++;
      }
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      } */// ce_level
    }
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  }
  else
#endif
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    {
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      if (max_preamble_energy[0] > 350) {
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	LOG_D(PHY,"[eNB %d/%d][RAPROC] Frame %d, subframe %d Initiating RA procedure with preamble %d, energy %d.%d dB, delay %d\n",
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	      eNB->Mod_id,
	      eNB->CC_id,
	      frame,
	      subframe,
	      max_preamble[0],
	      max_preamble_energy[0]/10,
	      max_preamble_energy[0]%10,
	      max_preamble_delay[0]);
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	    T(T_ENB_PHY_INITIATE_RA_PROCEDURE, T_INT(eNB->Mod_id), T_INT(frame), T_INT(subframe),
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	      T_INT(max_preamble[0]), T_INT(max_preamble_energy[0]), T_INT(max_preamble_delay[0]));
	    
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	    prach_vars = &eNB->prach_vars;
	    
	    
	    pthread_mutex_lock(&eNB->UL_INFO_mutex);
	    
	    eNB->UL_INFO.rach_ind.number_of_preambles                 = 1;
	    eNB->UL_INFO.rach_ind.preamble_list                       = eNB->preamble_list;
	    
	    eNB->preamble_list[0].preamble_rel8.timing_advance        = max_preamble_delay[0];
	    eNB->preamble_list[0].preamble_rel8.preamble              = max_preamble[0];
	    eNB->preamble_list[0].preamble_rel8.rnti                  = 1+subframe;  // note: fid is implicitly 0 here
	    eNB->preamble_list[0].preamble_rel13.rach_resource_type   = 0;
	    eNB->preamble_list[0].instance_length                     = 0; //don't know exactly what this is
	    
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	    LOG_D(PHY,"Filling NFAPI indication for RACH : TA %d, Preamble %d, rnti %x, rach_resource_type %d\n",
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		  eNB->preamble_list[0].preamble_rel8.timing_advance,
		  eNB->preamble_list[0].preamble_rel8.preamble,
		  eNB->preamble_list[0].preamble_rel8.rnti,
		  eNB->preamble_list[0].preamble_rel13.rach_resource_type);	    
	    pthread_mutex_unlock(&eNB->UL_INFO_mutex);
      
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      } // max_preamble_energy > 350
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    } // else br_flag
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      /*
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	mac_xface->initiate_ra_proc(eNB->Mod_id,
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	eNB->CC_id,
	frame,
	preamble_max,
	preamble_delay_list[preamble_max]*update_TA/update_TA2,
	0,subframe,0);*/
      
    
    /*  } else {
    MSC_LOG_EVENT(MSC_PHY_ENB, "0 RA Failed add user, too many");
    LOG_I(PHY,"[eNB %d][RAPROC] frame %d, subframe %d: Unable to add user, max user count reached\n",
	  eNB->Mod_id,frame, subframe);
	  }*/
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PRACH_RX,0);
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}

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void srs_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc) {

  LTE_DL_FRAME_PARMS *fp = &eNB->frame_parms;
  const int subframe = proc->subframe_rx;
  const int frame = proc->frame_rx;

  int i;

  if (is_srs_occasion_common(fp,frame,subframe)) { 
  
  // Do SRS processing 
  // check if there is SRS and we have to use shortened format
  // TODO: check for exceptions in transmission of SRS together with ACK/NACK
    for (i=0;i<NUMBER_OF_UE_MAX;i++) {

      if (eNB->soundingrs_ul_config_dedicated[i].active==1) {

      
	if (lte_srs_channel_estimation(fp,
				       &eNB->common_vars,
				       &eNB->srs_vars[i],
				       &eNB->soundingrs_ul_config_dedicated[i],
				       subframe,
				       0/*eNB_id*/)) {
	  LOG_E(PHY,"problem processing SRS\n");
	}
	eNB->soundingrs_ul_config_dedicated[i].active=0;
      }
    }
  }
}

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void fill_sr_indication(PHY_VARS_eNB *eNB,uint16_t rnti,int frame,int subframe,uint32_t stat) {
  
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  pthread_mutex_lock(&eNB->UL_INFO_mutex);
  nfapi_sr_indication_pdu_t *pdu =   &eNB->UL_INFO.sr_ind.sr_pdu_list[eNB->UL_INFO.sr_ind.number_of_srs];

  pdu->instance_length                                = 0; // don't know what to do with this
  //  pdu->rx_ue_information.handle                       = handle;
  pdu->rx_ue_information.rnti                         = rnti;

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  int SNRtimes10 = dB_fixed_times10(stat) - 200;//(10*eNB->measurements.n0_power_dB[0]);


  if      (SNRtimes10 < -640) pdu->ul_cqi_information.ul_cqi=0;
  else if (SNRtimes10 >  635) pdu->ul_cqi_information.ul_cqi=255;
  else                        pdu->ul_cqi_information.ul_cqi=(640+SNRtimes10)/5;
  pdu->ul_cqi_information.channel = 0;

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  eNB->UL_INFO.sr_ind.number_of_srs++;
  pthread_mutex_unlock(&eNB->UL_INFO_mutex);
}

void uci_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc)
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{
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  LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
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  uint8_t SR_payload = 0,pucch_b0b1[4][2]= {{0,0},{0,0},{0,0},{0,0}},harq_ack[4]={0,0,0,0};
  int32_t metric[4]={0,0,0,0},metric_SR=0,max_metric;
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  const int subframe = proc->subframe_rx;
  const int frame = proc->frame_rx;
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  int i;
  LTE_eNB_UCI *uci;
  uint16_t tdd_multiplexing_mask=0;
  int res;
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  for (i=0;i<NUMBER_OF_UE_MAX;i++) {
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    uci = &eNB->uci_vars[i];
    if ((uci->active == 1) &&
	(uci->frame == frame) &&
	(uci->subframe == subframe)) {
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      LOG_D(PHY,"Frame %d, subframe %d: Running uci procedures (type %d) for %d \n",frame,subframe,uci->type,i);
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      uci->active=0;
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      // Null out PUCCH PRBs for noise measurement
      switch(fp->N_RB_UL) {
      case 6:
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        eNB->rb_mask_ul[0] |= (0x1 | (1<<5)); //position 5
        break;
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      case 15:
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        eNB->rb_mask_ul[0] |= (0x1 | (1<<14)); // position 14
        break;
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      case 25:
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        eNB->rb_mask_ul[0] |= (0x1 | (1<<24)); // position 24
        break;
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      case 50:
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        eNB->rb_mask_ul[0] |= 0x1;
        eNB->rb_mask_ul[1] |= (1<<17); // position 49 (49-32)
        break;
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      case 75:
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        eNB->rb_mask_ul[0] |= 0x1;
        eNB->rb_mask_ul[2] |= (1<<10); // position 74 (74-64)
        break;
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      case 100:
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        eNB->rb_mask_ul[0] |= 0x1;
        eNB->rb_mask_ul[3] |= (1<<3); // position 99 (99-96)
        break;
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      default:
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        LOG_E(PHY,"Unknown number for N_RB_UL %d\n",fp->N_RB_UL);
        break;
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      }
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      switch (uci->type) {
      case SR:
      case HARQ_SR:
		
	metric_SR = rx_pucch(eNB,
			      uci->pucch_fmt,
			      i,
			      uci->n_pucch_1_0_sr[0],
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			      0, // n2_pucch
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			      uci->srs_active, // shortened format
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			      &SR_payload,
			      frame,
			      subframe,
			      PUCCH1_THRES);
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	LOG_D(PHY,"[eNB %d][SR %x] Frame %d subframe %d Checking SR is %d (SR n1pucch is %d)\n",
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	      eNB->Mod_id,
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	      uci->rnti,
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	      frame,
	      subframe,
	      SR_payload,
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	      uci->n_pucch_1_0_sr[0]);
	if (uci->type == SR) {
	  if (SR_payload == 1) {
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	    fill_sr_indication(eNB,uci->rnti,frame,subframe,metric_SR);
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	    return;
	  }
	  else {
	    return;
	  }
	}
      case HARQ:
	if (fp->frame_type == FDD) {
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	  LOG_D(PHY,"Frame %d Subframe %d Demodulating PUCCH (UCI %d) for ACK/NAK (uci->pucch_fmt %d,uci->type %d.uci->frame %d, uci->subframe %d): n1_pucch0 %d SR_payload %d\n",
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		frame,subframe,i,
		uci->pucch_fmt,uci->type,
		uci->frame,uci->subframe,uci->n_pucch_1[0][0],
		SR_payload);
	  
	  metric[0] = rx_pucch(eNB,
			       uci->pucch_fmt,
			       i,
			       uci->n_pucch_1[0][0],
			       0, //n2_pucch
			       uci->srs_active, // shortened format
			       pucch_b0b1[0],
			       frame,
			       subframe,
			       PUCCH1a_THRES);
	  
	  
	  /* cancel SR detection if reception on n1_pucch0 is better than on SR PUCCH resource index, otherwise send it up to MAC */
	  if (uci->type==HARQ_SR && metric[0] > metric_SR) SR_payload = 0;
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	  else if (SR_payload == 1) fill_sr_indication(eNB,uci->rnti,frame,subframe,metric_SR);
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	  if (uci->type==HARQ_SR && metric[0] <= metric_SR) {
	    /* when transmitting ACK/NACK on SR PUCCH resource index, SR payload is always 1 */
	    SR_payload = 1;
	    
	    metric[0]=rx_pucch(eNB,
			       uci->pucch_fmt,
			       i,
			       uci->n_pucch_1_0_sr[0],
			       0, //n2_pucch
			       uci->srs_active, // shortened format
			       pucch_b0b1[0],
			       frame,
			       subframe,
			       PUCCH1a_THRES);
	  }
	  
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	  LOG_D(PHY,"[eNB %d][PDSCH %x] Frame %d subframe %d pucch1a (FDD) payload %d (metric %d)\n",
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		eNB->Mod_id,
		uci->rnti,
		frame,subframe,
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		pucch_b0b1[0][0],metric[0]);

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	  fill_uci_harq_indication(eNB,uci,frame,subframe,pucch_b0b1[0],0,0xffff);
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	}
	else { // frame_type == TDD
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	  // if SR was detected, use the n1_pucch from SR
	  if (SR_payload==1) {
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#ifdef DEBUG_PHY_PROC
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	    LOG_D(PHY,"[eNB %d][PDSCH %x] Frame %d subframe %d Checking ACK/NAK (%d,%d,%d,%d) format %d with SR\n",eNB->Mod_id,
		  eNB->dlsch[UE_id][0]->rnti,
		  frame,subframe,
		  n1_pucch0,n1_pucch1,n1_pucch2,n1_pucch3,format);
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#endif
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	    metric[0] = rx_pucch(eNB,
				 pucch_format1b,
				 i,
				 uci->n_pucch_1_0_sr[0],
				 0, //n2_pucch
				 uci->srs_active, // shortened format
				 pucch_b0b1[0],
				 frame,
				 subframe,
				 PUCCH1a_THRES);
	  } else { //using assigned pucch resources
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	    LOG_D(PHY,"[eNB %d][PDSCH %x] Frame %d subframe %d Checking ACK/NAK M=%d (%d,%d,%d,%d) format %d\n",eNB->Mod_id,
		  eNB->dlsch[UE_id][0]->rnti,
		  frame,subframe,
		  uci->num_pucch_resources,
		  uci->n_pucch_1[res][0],
		  uci->n_pucch_1[res][1],
		  uci->n_pucch_1[res][2],
		  uci->n_pucch_1[res][3],
		  uci->pucch_fmt);