lte-enb.c 61 KB
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/*******************************************************************************
    OpenAirInterface
    Copyright(c) 1999 - 2014 Eurecom

    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.


    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.

    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/>.

   Contact Information
   OpenAirInterface Admin: openair_admin@eurecom.fr
   OpenAirInterface Tech : openair_tech@eurecom.fr
   OpenAirInterface Dev  : openair4g-devel@lists.eurecom.fr

   Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE

*******************************************************************************/

/*! \file lte-enb.c
 * \brief Top-level threads for eNodeB
 * \author R. Knopp, F. Kaltenberger, Navid Nikaein
 * \date 2012
 * \version 0.1
 * \company Eurecom
 * \email: knopp@eurecom.fr,florian.kaltenberger@eurecom.fr, navid.nikaein@eurecom.fr
 * \note
 * \warning
 */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sched.h>
#include <linux/sched.h>
#include <signal.h>
#include <execinfo.h>
#include <getopt.h>
#include <sys/sysinfo.h>
#include "rt_wrapper.h"

#undef MALLOC //there are two conflicting definitions, so we better make sure we don't use it at all

#include "assertions.h"
#include "msc.h"

#include "PHY/types.h"

#include "PHY/defs.h"
#undef MALLOC //there are two conflicting definitions, so we better make sure we don't use it at all
//#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all

#include "../../ARCH/COMMON/common_lib.h"

//#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all

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#include "PHY/LTE_TRANSPORT/if4_tools.h"
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#include "PHY/LTE_TRANSPORT/if5_tools.h"
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#include "PHY/extern.h"
#include "SCHED/extern.h"
#include "LAYER2/MAC/extern.h"

#include "../../SIMU/USER/init_lte.h"

#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/extern.h"
#include "LAYER2/MAC/proto.h"
#include "RRC/LITE/extern.h"
#include "PHY_INTERFACE/extern.h"

#ifdef SMBV
#include "PHY/TOOLS/smbv.h"
unsigned short config_frames[4] = {2,9,11,13};
#endif
#include "UTIL/LOG/log_extern.h"
#include "UTIL/OTG/otg_tx.h"
#include "UTIL/OTG/otg_externs.h"
#include "UTIL/MATH/oml.h"
#include "UTIL/LOG/vcd_signal_dumper.h"
#include "UTIL/OPT/opt.h"
#include "enb_config.h"
//#include "PHY/TOOLS/time_meas.h"

#ifndef OPENAIR2
#include "UTIL/OTG/otg_extern.h"
#endif

#if defined(ENABLE_ITTI)
# if defined(ENABLE_USE_MME)
#   include "s1ap_eNB.h"
#ifdef PDCP_USE_NETLINK
#   include "SIMULATION/ETH_TRANSPORT/proto.h"
#endif
# endif
#endif

//#define DEBUG_THREADS 1

//#define USRP_DEBUG 1
struct timing_info_t {
  //unsigned int frame, hw_slot, last_slot, next_slot;
  RTIME time_min, time_max, time_avg, time_last, time_now;
  //unsigned int mbox0, mbox1, mbox2, mbox_target;
  unsigned int n_samples;
} timing_info;

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// Fix per CC openair rf/if device update
// extern openair0_device openair0;
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#if defined(ENABLE_ITTI)
extern volatile int             start_eNB;
extern volatile int             start_UE;
#endif
extern volatile int                    oai_exit;

extern openair0_config_t openair0_cfg[MAX_CARDS];

extern pthread_cond_t sync_cond;
extern pthread_mutex_t sync_mutex;
extern int sync_var;

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//pthread_t                       main_eNB_thread;
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time_stats_t softmodem_stats_mt; // main thread
time_stats_t softmodem_stats_hw; //  hw acquisition
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time_stats_t softmodem_stats_rxtx_sf; // total tx time
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time_stats_t softmodem_stats_rx_sf; // total rx time
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int32_t **rxdata;
int32_t **txdata;

static int                      time_offset[4] = {0,0,0,0};

/* mutex, cond and variable to serialize phy proc TX calls
 * (this mechanism may be relaxed in the future for better
 * performances)
 */
static struct {
  pthread_mutex_t  mutex_phy_proc_tx;
  pthread_cond_t   cond_phy_proc_tx;
  volatile uint8_t phy_proc_CC_id;
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} sync_phy_proc;
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void exit_fun(const char* s);

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void init_eNB(eNB_func_t node_function,int nb_inst);
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void stop_eNB(void);


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void do_OFDM_mod_rt(int subframe,PHY_VARS_eNB *phy_vars_eNB) {
     
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  unsigned int aa,slot_offset, slot_offset_F;
  int dummy_tx_b[7680*4] __attribute__((aligned(32)));
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  int i,j, tx_offset;
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  int slot_sizeF = (phy_vars_eNB->frame_parms.ofdm_symbol_size)*
                   ((phy_vars_eNB->frame_parms.Ncp==1) ? 6 : 7);
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  int len,len2;
  int16_t *txdata;
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  slot_offset_F = (subframe<<1)*slot_sizeF;

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  slot_offset = subframe*phy_vars_eNB->frame_parms.samples_per_tti;
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  if ((subframe_select(&phy_vars_eNB->frame_parms,subframe)==SF_DL)||
      ((subframe_select(&phy_vars_eNB->frame_parms,subframe)==SF_S))) {
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    //    LOG_D(HW,"Frame %d: Generating slot %d\n",frame,next_slot);

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    for (aa=0; aa<phy_vars_eNB->frame_parms.nb_antennas_tx; aa++) {
      if (phy_vars_eNB->frame_parms.Ncp == EXTENDED) {
        PHY_ofdm_mod(&phy_vars_eNB->common_vars.txdataF[0][aa][slot_offset_F],
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                     dummy_tx_b,
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                     phy_vars_eNB->frame_parms.ofdm_symbol_size,
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                     6,
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                     phy_vars_eNB->frame_parms.nb_prefix_samples,
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                     CYCLIC_PREFIX);
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        PHY_ofdm_mod(&phy_vars_eNB->common_vars.txdataF[0][aa][slot_offset_F+slot_sizeF],
                     dummy_tx_b+(phy_vars_eNB->frame_parms.samples_per_tti>>1),
                     phy_vars_eNB->frame_parms.ofdm_symbol_size,
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                     6,
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                     phy_vars_eNB->frame_parms.nb_prefix_samples,
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                     CYCLIC_PREFIX);
      } else {
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        normal_prefix_mod(&phy_vars_eNB->common_vars.txdataF[0][aa][slot_offset_F],
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                          dummy_tx_b,
                          7,
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                          &(phy_vars_eNB->frame_parms));
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	// if S-subframe generate first slot only
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	if (subframe_select(&phy_vars_eNB->frame_parms,subframe) == SF_DL) 
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	  normal_prefix_mod(&phy_vars_eNB->common_vars.txdataF[0][aa][slot_offset_F+slot_sizeF],
			    dummy_tx_b+(phy_vars_eNB->frame_parms.samples_per_tti>>1),
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			    7,
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			    &(phy_vars_eNB->frame_parms));
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      }

      // if S-subframe generate first slot only
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      if (subframe_select(&phy_vars_eNB->frame_parms,subframe) == SF_S)
	len = phy_vars_eNB->frame_parms.samples_per_tti>>1;
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      else
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	len = phy_vars_eNB->frame_parms.samples_per_tti;
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      /*
      for (i=0;i<len;i+=4) {
	dummy_tx_b[i] = 0x100;
	dummy_tx_b[i+1] = 0x01000000;
	dummy_tx_b[i+2] = 0xff00;
	dummy_tx_b[i+3] = 0xff000000;
	}*/
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      if (slot_offset+time_offset[aa]<0) {
	txdata = (int16_t*)&phy_vars_eNB->common_vars.txdata[0][aa][(LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti)+tx_offset];
        len2 = -(slot_offset+time_offset[aa]);
	len2 = (len2>len) ? len : len2;
	for (i=0; i<(len2<<1); i++) {
	  txdata[i] = ((int16_t*)dummy_tx_b)[i]<<openair0_cfg[0].iq_txshift;
	}
	if (len2<len) {
	  txdata = (int16_t*)&phy_vars_eNB->common_vars.txdata[0][aa][0];
	  for (j=0; i<(len<<1); i++,j++) {
	    txdata[j++] = ((int16_t*)dummy_tx_b)[i]<<openair0_cfg[0].iq_txshift;
	  }
	}
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      }  
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      else if ((slot_offset+time_offset[aa]+len)>(LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti)) {
	tx_offset = (int)slot_offset+time_offset[aa];
	txdata = (int16_t*)&phy_vars_eNB->common_vars.txdata[0][aa][tx_offset];
	len2 = -tx_offset+LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti;
	for (i=0; i<(len2<<1); i++) {
	  txdata[i] = ((int16_t*)dummy_tx_b)[i]<<openair0_cfg[0].iq_txshift;
	}
	txdata = (int16_t*)&phy_vars_eNB->common_vars.txdata[0][aa][0];
	for (j=0; i<(len<<1); i++,j++) {
	  txdata[j++] = ((int16_t*)dummy_tx_b)[i]<<openair0_cfg[0].iq_txshift;
	}
      }
      else {
	tx_offset = (int)slot_offset+time_offset[aa];
	txdata = (int16_t*)&phy_vars_eNB->common_vars.txdata[0][aa][tx_offset];
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	for (i=0; i<(len<<1); i++) {
	  txdata[i] = ((int16_t*)dummy_tx_b)[i]<<openair0_cfg[0].iq_txshift;
	}
      }
      
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     // if S-subframe switch to RX in second subframe
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      /*
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     if (subframe_select(&phy_vars_eNB->frame_parms,subframe) == SF_S) {
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       for (i=0; i<len; i++) {
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	 phy_vars_eNB->common_vars.txdata[0][aa][tx_offset++] = 0x00010001;
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       }
     }
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      */
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     if ((((phy_vars_eNB->frame_parms.tdd_config==0) ||
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	   (phy_vars_eNB->frame_parms.tdd_config==1) ||
	   (phy_vars_eNB->frame_parms.tdd_config==2) ||
	   (phy_vars_eNB->frame_parms.tdd_config==6)) && 
	   (subframe==0)) || (subframe==5)) {
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       // turn on tx switch N_TA_offset before
       //LOG_D(HW,"subframe %d, time to switch to tx (N_TA_offset %d, slot_offset %d) \n",subframe,phy_vars_eNB->N_TA_offset,slot_offset);
       for (i=0; i<phy_vars_eNB->N_TA_offset; i++) {
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         tx_offset = (int)slot_offset+time_offset[aa]+i-phy_vars_eNB->N_TA_offset/2;
         if (tx_offset<0)
           tx_offset += LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti;
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         if (tx_offset>=(LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti))
           tx_offset -= LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->frame_parms.samples_per_tti;
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         phy_vars_eNB->common_vars.txdata[0][aa][tx_offset] = 0x00000000;
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       }
     }
    }
  }
}

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/*!
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 * \brief The RX UE-specific and TX thread of eNB.
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 * \param param is a \ref eNB_proc_t structure which contains the info what to process.
 * \returns a pointer to an int. The storage is not on the heap and must not be freed.
 */
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static void* eNB_thread_rxtx( void* param ) {

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  static int eNB_thread_rxtx_status;
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  eNB_rxtx_proc_t *proc = (eNB_rxtx_proc_t*)param;
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  FILE  *tx_time_file = NULL;
  char tx_time_name[101];
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  void *txp[PHY_vars_eNB_g[0][0]->frame_parms.nb_antennas_tx]; 
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  uint16_t packet_type;
  uint32_t symbol_number=0;
  
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  uint8_t seqno=0;
  
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  if (opp_enabled == 1) {
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    snprintf(tx_time_name, 100,"/tmp/%s_tx_time_thread_sf", "eNB");
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    tx_time_file = fopen(tx_time_name,"w");
  }
  // set default return value
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  eNB_thread_rxtx_status = 0;
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  MSC_START_USE();

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#ifdef DEADLINE_SCHEDULER
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  struct sched_attr attr;
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  unsigned int flags = 0;
  uint64_t runtime  = 850000 ;  
  uint64_t deadline = 1   *  1000000 ; // each tx thread will finish within 1ms
  uint64_t period   = 1   * 10000000; // each tx thread has a period of 10ms from the starting point

  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;

  attr.sched_policy   = SCHED_DEADLINE;
  attr.sched_runtime  = runtime;
  attr.sched_deadline = deadline;
  attr.sched_period   = period; 

  if (sched_setattr(0, &attr, flags) < 0 ) {
    perror("[SCHED] eNB tx thread: sched_setattr failed\n");
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    return &eNB_thread_rxtx_status;
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  }

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  LOG_I( HW, "[SCHED] eNB RXn-TXnp4 deadline thread (TID %ld) started on CPU %d\n", gettid(), sched_getcpu() );
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#else //LOW_LATENCY
  int policy, s, j;
  struct sched_param sparam;
  char cpu_affinity[1024];
  cpu_set_t cpuset;
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  struct timespec wait;

  wait.tv_sec=0;
  wait.tv_nsec=5000000L;
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  /* Set affinity mask to include CPUs 1 to MAX_CPUS */
  /* CPU 0 is reserved for UHD threads */
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  /* CPU 1 is reserved for all RX_TX threads */
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  /* Enable CPU Affinity only if number of CPUs >2 */
  CPU_ZERO(&cpuset);

#ifdef CPU_AFFINITY
  if (get_nprocs() > 2)
  {
    for (j = 1; j < get_nprocs(); j++)
        CPU_SET(j, &cpuset);
    s = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
    if (s != 0)
    {
      perror( "pthread_setaffinity_np");
      exit_fun("Error setting processor affinity");
    }
  }
#endif //CPU_AFFINITY

  /* Check the actual affinity mask assigned to the thread */
  s = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
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  if (s != 0) {
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    perror( "pthread_getaffinity_np");
    exit_fun("Error getting processor affinity ");
  }
  memset(cpu_affinity,0,sizeof(cpu_affinity));
  for (j = 0; j < CPU_SETSIZE; j++)
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    if (CPU_ISSET(j, &cpuset)) {  
      char temp[1024];
      sprintf (temp, " CPU_%d", j);
      strcat(cpu_affinity, temp);
    }
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  memset(&sparam, 0, sizeof(sparam));
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  sparam.sched_priority = sched_get_priority_max(SCHED_FIFO)-1;
  policy = SCHED_FIFO ; 
  
  s = pthread_setschedparam(pthread_self(), policy, &sparam);
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  if (s != 0) {
    perror("pthread_setschedparam : ");
    exit_fun("Error setting thread priority");
  }
  
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  s = pthread_getschedparam(pthread_self(), &policy, &sparam);
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  if (s != 0) {
    perror("pthread_getschedparam : ");
    exit_fun("Error getting thread priority");
  }
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  LOG_I(HW, "[SCHED][eNB] RXn_TXnp4 thread started on CPU %d TID %ld, sched_policy = %s , priority = %d, CPU Affinity=%s \n",sched_getcpu(),gettid(),
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                   (policy == SCHED_FIFO)  ? "SCHED_FIFO" :
                   (policy == SCHED_RR)    ? "SCHED_RR" :
                   (policy == SCHED_OTHER) ? "SCHED_OTHER" :
                   "???",
                   sparam.sched_priority, cpu_affinity );

#endif //LOW_LATENCY

  mlockall(MCL_CURRENT | MCL_FUTURE);

  while (!oai_exit) {
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    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_PROC_RXTX0+(proc->subframe_rx&1), 0 );
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    if (pthread_mutex_timedlock(&proc->mutex_rxtx,&wait) != 0) {
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      LOG_E( PHY, "[SCHED][eNB] error locking mutex for eNB RXn-TXnp4\n");
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      exit_fun("nothing to add");
      break;
    }

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    while (proc->instance_cnt_rxtx < 0) {
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      // most of the time the thread is waiting here
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      // proc->instance_cnt_rxtx is -1
      pthread_cond_wait( &proc->cond_rxtx, &proc->mutex_rxtx ); // this unlocks mutex_rxtx while waiting and then locks it again
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    }

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    if (pthread_mutex_unlock(&proc->mutex_rxtx) != 0) {
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      LOG_E(PHY,"[SCHED][eNB] error unlocking mutex for eNB TX\n");
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      exit_fun("nothing to add");
      break;
    }

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    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_PROC_RXTX0+(proc->subframe_rx&1), 1 );
    start_meas( &softmodem_stats_rxtx_sf );
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    if (oai_exit) break;

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    // Common procedures
    phy_procedures_eNB_common_RX(PHY_vars_eNB_g[0][proc->CC_id], 0);

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    // UE-specific RX processing for subframe n
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    if ((PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP_BBU) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RCC_IF4)) {
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      // this is the ue-specific processing for the subframe and can be multi-threaded later
      phy_procedures_eNB_uespec_RX(PHY_vars_eNB_g[0][proc->CC_id], proc, 0, no_relay );
    }

    // TX processing for subframe n+4
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    if (((PHY_vars_eNB_g[0][proc->CC_id]->frame_parms.frame_type == TDD) &&
         ((subframe_select(&PHY_vars_eNB_g[0][proc->CC_id]->frame_parms,proc->subframe_tx) == SF_DL) ||
          (subframe_select(&PHY_vars_eNB_g[0][proc->CC_id]->frame_parms,proc->subframe_tx) == SF_S))) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->frame_parms.frame_type == FDD)) {
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      /* run PHY TX procedures the one after the other for all CCs to avoid race conditions
       * (may be relaxed in the future for performance reasons)
       */
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      if (pthread_mutex_timedlock(&sync_phy_proc.mutex_phy_proc_tx,&wait) != 0) {
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        LOG_E(PHY, "[SCHED][eNB] error locking PHY proc mutex for eNB TX\n");
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        exit_fun("nothing to add");
        break;
      }
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      // wait for our turn or oai_exit
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      while (sync_phy_proc.phy_proc_CC_id != proc->CC_id && !oai_exit) {
        pthread_cond_wait(&sync_phy_proc.cond_phy_proc_tx,
                          &sync_phy_proc.mutex_phy_proc_tx);
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      }

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      if (pthread_mutex_unlock(&sync_phy_proc.mutex_phy_proc_tx) != 0) {
        LOG_E(PHY, "[SCHED][eNB] error unlocking PHY proc mutex for eNB TX\n");
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        exit_fun("nothing to add");
      }

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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_FRAME_NUMBER_TX_ENB, proc->frame_tx );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_TX_ENB, proc->subframe_tx );
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      if (oai_exit) break;
      
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      if ((PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP) ||
          (PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP_BBU) ||
          (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RCC_IF4)) { 
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        phy_procedures_eNB_TX(PHY_vars_eNB_g[0][proc->CC_id], proc, 0, no_relay, NULL );

        /* we're done, let the next one proceed */
        if (pthread_mutex_lock(&sync_phy_proc.mutex_phy_proc_tx) != 0) {
          LOG_E(PHY, "[SCHED][eNB] error locking PHY proc mutex for eNB TX proc\n");
          exit_fun("nothing to add");
          break;
        }	
        sync_phy_proc.phy_proc_CC_id++;
        sync_phy_proc.phy_proc_CC_id %= MAX_NUM_CCs;
        pthread_cond_broadcast(&sync_phy_proc.cond_phy_proc_tx);
        if (pthread_mutex_unlock(&sync_phy_proc.mutex_phy_proc_tx) != 0) {
          LOG_E(PHY, "[SCHED][eNB] error unlocking PHY proc mutex for eNB TX proc\n");
          exit_fun("nothing to add");
          break;
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	}
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      } else if (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RRU_IF4) {
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        /// **** recv_IF4 of txdataF from RCC **** ///             
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        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 1 );  
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        do { 
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          recv_IF4(PHY_vars_eNB_g[0][proc->CC_id], &proc->frame_tx, &proc->subframe_tx, &packet_type, &symbol_number);
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        } while (symbol_number < PHY_vars_eNB_g[0][proc->CC_id]->frame_parms.symbols_per_tti-1); 
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        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 0 );   
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      } else if (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RRU_IF5) {
        /// **** recv_IF5 of txdata from BBU **** ///       
        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 1 );  
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        recv_IF5(PHY_vars_eNB_g[0][proc->CC_id], &proc->timestamp_tx, proc->subframe_tx, IF5_RRH_GW_DL);
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        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 0 );  

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      }
    }

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    // eNodeB_3GPP, _BBU and RRU create txdata
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    if ((PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP_BBU) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RRU_IF4)) {
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_SFGEN , 1 );
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      do_OFDM_mod_rt( proc->subframe_tx, PHY_vars_eNB_g[0][proc->CC_id] );
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_SFGEN , 0 );
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    }

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      /*
        short *txdata = (short*)&PHY_vars_eNB_g[0][proc->CC_id]->common_vars.txdata[0][0][proc->subframe_tx*PHY_vars_eNB_g[0][proc->CC_id]->frame_parms.samples_per_tti];
        int i;
        for (i=0;i<PHY_vars_eNB_g[0][proc->CC_id]->frame_parms.samples_per_tti*2;i+=8) {
        txdata[i] = 2047;
        txdata[i+1] = 0;
        txdata[i+2] = 0;
        txdata[i+3] = 2047;
        txdata[i+4] = -2047;
        txdata[i+5] = 0;
        txdata[i+6] = 0;
        txdata[i+7] = -2047;      }
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      */      
          
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    // eNodeB_3GPP, RRU write to RF device    
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    if ((PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RRU_IF4) ||
        (PHY_vars_eNB_g[0][proc->CC_id]->node_function == NGFI_RRU_IF5)) {
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      // Transmit TX buffer based on timestamp from RX  
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE, 1 );
      // prepare tx buffer pointers
      int i;
      for (i=0; i<PHY_vars_eNB_g[0][0]->frame_parms.nb_antennas_tx; i++)
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        txp[i] = (void*)&PHY_vars_eNB_g[0][0]->common_vars.txdata[0][i][proc->subframe_tx*PHY_vars_eNB_g[0][0]->frame_parms.samples_per_tti];
    
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      // if symb_written < spp ==> error 
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      PHY_vars_eNB_g[0][proc->CC_id]->rfdevice.trx_write_func(&PHY_vars_eNB_g[0][proc->CC_id]->rfdevice,
            (proc->timestamp_tx-openair0_cfg[0].tx_sample_advance),
            txp,
            PHY_vars_eNB_g[0][0]->frame_parms.samples_per_tti,
            PHY_vars_eNB_g[0][0]->frame_parms.nb_antennas_tx,
            1);
	      
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE, 0 );
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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_TST, (proc->timestamp_tx-openair0_cfg[0].tx_sample_advance)&0xffffffff );

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    } else if (PHY_vars_eNB_g[0][proc->CC_id]->node_function == eNodeB_3GPP_BBU) {
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      /// **** send_IF5 of txdata to RRH **** ///       
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_SEND_IF5, 1 );  
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      send_IF5(PHY_vars_eNB_g[0][proc->CC_id], proc->timestamp_tx, proc->subframe_tx, &seqno, IF5_RRH_GW_DL);
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_SEND_IF5, 0 );  
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    } else { 
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      /// **** send_IF4 of txdataF to RRU **** ///       
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_SEND_IF4, 1 );   
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      send_IF4(PHY_vars_eNB_g[0][proc->CC_id], proc->frame_tx, proc->subframe_tx, IF4_PDLFFT, 0);
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      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_SEND_IF4, 0 );
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    }

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    if (pthread_mutex_lock(&proc->mutex_rxtx) != 0) {
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      LOG_E( PHY, "[SCHED][eNB] error locking mutex for eNB TX proc\n");
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      exit_fun("nothing to add");
      break;
    }

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    proc->instance_cnt_rxtx--;
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    if (pthread_mutex_unlock(&proc->mutex_rxtx) != 0) {
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      LOG_E( PHY, "[SCHED][eNB] error unlocking mutex for eNB TX proc\n");
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      exit_fun("nothing to add");
      break;
    }

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    stop_meas( &softmodem_stats_rxtx_sf );
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#ifdef DEADLINE_SCHEDULER
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    if (opp_enabled){
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      if(softmodem_stats_rxtx_sf.diff_now/(cpuf) > attr.sched_runtime){
	VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RUNTIME_TX_ENB, (softmodem_stats_rxtx_sf.diff_now/cpuf - attr.sched_runtime)/1000000.0);
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    }
#endif 

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    print_meas_now(&softmodem_stats_rxtx_sf,"eNB_TX_SF",tx_time_file);
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  }

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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_PROC_RXTX0+(proc->subframe_rx&1), 0 );
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  printf( "Exiting eNB thread RXn_TXnp4\n");
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  eNB_thread_rxtx_status = 0;
  return &eNB_thread_rxtx_status;
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}

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#if defined(ENABLE_ITTI)
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/* Wait for eNB application initialization to be complete (eNB registration to MME) */
static void wait_system_ready (char *message, volatile int *start_flag) {
  
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  static char *indicator[] = {".    ", "..   ", "...  ", ".... ", ".....",
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			      " ....", "  ...", "   ..", "    .", "     "};
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  int i = 0;
  
  while ((!oai_exit) && (*start_flag == 0)) {
    LOG_N(EMU, message, indicator[i]);
    fflush(stdout);
    i = (i + 1) % (sizeof(indicator) / sizeof(indicator[0]));
    usleep(200000);
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  }
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  LOG_D(EMU,"\n");
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}
#endif
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/*!
 * \brief The Asynchronous RX FH thread of RAU/RCC/eNB.
 * This handles the RX FH for an asynchronous RRU/UE
 * \param param is a \ref eNB_proc_t structure which contains the info what to process.
 * \returns a pointer to an int. The storage is not on the heap and must not be freed.
 */
static void* eNB_thread_asynch_rx( void* param ) {

  eNB_proc_t *proc = (eNB_proc_t*)param;
  PHY_VARS_eNB *eNB = PHY_vars_eNB_g[0][proc->CC_id];
  LTE_DL_FRAME_PARMS *fp = &eNB->frame_parms;
  openair0_timestamp timestamp_rx;
  int frame_rx,subframe_rx;
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  static int first_rx = 1;
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  uint16_t packet_type;
  uint32_t symbol_number=0;
  uint32_t symbol_mask, symbol_mask_full;
  int prach_rx;

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#ifdef DEADLINE_SCHEDULER
  struct sched_attr attr;
  unsigned int flags = 0;
  uint64_t runtime  = 870000 ;
  uint64_t deadline = 1   *  1000000;
  uint64_t period   = 1   * 10000000; // each rx thread has a period of 10ms from the starting point
 
  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;

  attr.sched_policy = SCHED_DEADLINE;
  attr.sched_runtime  = runtime;
  attr.sched_deadline = deadline;
  attr.sched_period   = period; 

  if (sched_setattr(0, &attr, flags) < 0 ) {
    perror("[SCHED] eNB FH sched_setattr failed\n");
    return &eNB_thread_FH_status;
  }

  LOG_I( HW, "[SCHED] eNB asynch RX deadline thread (TID %ld) started on CPU %d\n", gettid(), sched_getcpu() );
#else // LOW_LATENCY
  int policy, s, j;
  struct sched_param sparam;
  char cpu_affinity[1024];
  cpu_set_t cpuset;

  /* Set affinity mask to include CPUs 1 to MAX_CPUS */
  /* CPU 0 is reserved for UHD */
  /* CPU 1 is reserved for all TX threads */
  /* CPU 2..MAX_CPUS is reserved for all RX threads */
  /* Set CPU Affinity only if number of CPUs >2 */
  CPU_ZERO(&cpuset);
#ifdef CPU_AFFINITY
  if (get_nprocs() >2) {
    for (j = 1; j < get_nprocs(); j++)
      CPU_SET(j, &cpuset);
  
    s = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
    if (s != 0) {
      perror( "pthread_setaffinity_np");  
      exit_fun (" Error setting processor affinity :");
    }
  }
#endif //CPU_AFFINITY
  /* Check the actual affinity mask assigned to the thread */

  s = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
  if (s != 0) {
    perror ("pthread_getaffinity_np");
    exit_fun (" Error getting processor affinity :");
  }
  memset(cpu_affinity,0, sizeof(cpu_affinity));

  for (j = 0; j < CPU_SETSIZE; j++)
    if (CPU_ISSET(j, &cpuset)) {  
      char temp[1024];
      sprintf (temp, " CPU_%d", j);
      strcat(cpu_affinity, temp);
    }

  memset(&sparam, 0 , sizeof (sparam)); 
  sparam.sched_priority = sched_get_priority_max(SCHED_FIFO);

  policy = SCHED_FIFO ; 
  s = pthread_setschedparam(pthread_self(), policy, &sparam);
  if (s != 0) {
    perror("pthread_setschedparam : ");
    exit_fun("Error setting thread priority");     
  }

  memset(&sparam, 0 , sizeof (sparam));

  s = pthread_getschedparam(pthread_self(), &policy, &sparam);
  if (s != 0) {
    perror("pthread_getschedparam");
    exit_fun("Error getting thread priority");
  }

  LOG_I(HW, "[SCHED][eNB] eNB asynch RX thread started on CPU %d TID %ld, sched_policy = %s, priority = %d, CPU Affinity = %s\n", sched_getcpu(),gettid(),
	 (policy == SCHED_FIFO)  ? "SCHED_FIFO" :
	 (policy == SCHED_RR)    ? "SCHED_RR" :
	 (policy == SCHED_OTHER) ? "SCHED_OTHER" :
	 "???",
	 sparam.sched_priority, cpu_affinity);
  
  
#endif // DEADLINE_SCHEDULER

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  if (eNB->node_function == eNodeB_3GPP_BBU) { // acquisition from IF
      /// **** recv_IF5 of rxdata from RRH **** ///       
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 1 );  
    recv_IF5(eNB, &timestamp_rx, subframe_rx++, IF5_RRH_GW_UL); 
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 0 );  
    if (first_rx == 1) {
      first_rx = 0;
      subframe_rx = (timestamp_rx/fp->samples_per_tti)%10;
    }
    else {
    // check timestamp
      if ((timestamp_rx - proc->timestamp_rx) < (2*fp->samples_per_tti))
	printf("RX overflow ...\n");

    }
  } // eNodeB_3GPP_BBU 
  
  else if (eNB->node_function == NGFI_RCC_IF4) {
      /// **** recv_IF4 of rxdataF from RRU **** ///
      /// **** recv_IF4 of rxsigF from RRU **** ///
      // get frame/subframe information from IF4 interface
      // timed loop (200 us)
      
      symbol_number = 0;
      symbol_mask = 0;
      symbol_mask_full = (1<<fp->symbols_per_tti)-1;
      prach_rx = 0;
         
      do {   // Blocking, we need a timeout on this !!!!!!!!!!!!!!!!!!!!!!!

        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 1 );   
        recv_IF4(eNB, &frame_rx, &subframe_rx, &packet_type, &symbol_number);
        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 0 );   

        if (packet_type == IF4_PULFFT) {
          symbol_mask = symbol_mask | (1<<symbol_number);     
                       
        } else if (packet_type == IF4_PRACH) {
          // wake up thread for PRACH RX
          prach_rx = 1;
	}



      } while( (symbol_mask != symbol_mask_full) && (prach_rx == 0));    

      if (proc->first_rx == 0) {
        if (subframe_rx < proc->subframe_rx+2){
          LOG_E(PHY,"RX overflow (proc->subframe_rx %d, subframe_rx %d)\n",proc->subframe_rx,subframe_rx);
        }
      } else {
        proc->first_rx = 0;
      }
    } // node_timing == synch_to_externs, node_function = NGFI_IF4
    else { // should not get here
      AssertFatal(1==0, "Unknown eNB->node_function %d",eNB->node_function);
    }

}
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/*!
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 * \brief The Fronthaul thread of RRU/RAU/RCC/eNB
 * In the case of RRU/eNB, handles interface with external RF
 * In the case of RAU/RCC, handles fronthaul interface with RRU/RAU
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 * \param param is a \ref eNB_proc_t structure which contains the info what to process.
 * \returns a pointer to an int. The storage is not on the heap and must not be freed.
 */
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static void* eNB_thread_FH( void* param ) {
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  static int eNB_thread_FH_status;
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  eNB_proc_t *proc = (eNB_proc_t*)param;
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  PHY_VARS_eNB *eNB = PHY_vars_eNB_g[0][proc->CC_id];
  LTE_DL_FRAME_PARMS *fp = &eNB->frame_parms;
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  void *rxp[fp->nb_antennas_rx]; 
  unsigned int rxs;
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  FILE  *rx_time_file = NULL;
  char rx_time_name[101];
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  struct timespec wait;
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  int i;
  int prach_rx;



  uint16_t packet_type;
  uint32_t symbol_number=0;
  uint32_t symbol_mask, symbol_mask_full;

  int subframe = proc->subframe_rx;
  int frame = proc->frame_rx;
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  wait.tv_sec=0;
  wait.tv_nsec=5000000L;
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  if (opp_enabled == 1) {
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    snprintf(rx_time_name, 100,"/tmp/%s_rx_time_thread_sf", "eNB");
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    rx_time_file = fopen(rx_time_name,"w");
  }
  // set default return value
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  eNB_thread_FH_status = 0;
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  MSC_START_USE();

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#ifdef DEADLINE_SCHEDULER
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  struct sched_attr attr;
  unsigned int flags = 0;
  uint64_t runtime  = 870000 ;
  uint64_t deadline = 1   *  1000000;
  uint64_t period   = 1   * 10000000; // each rx thread has a period of 10ms from the starting point
 
  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;

  attr.sched_policy = SCHED_DEADLINE;
  attr.sched_runtime  = runtime;
  attr.sched_deadline = deadline;
  attr.sched_period   = period; 

  if (sched_setattr(0, &attr, flags) < 0 ) {
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    perror("[SCHED] eNB FH sched_setattr failed\n");
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    return &eNB_thread_FH_status;
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  }

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  LOG_I( HW, "[SCHED] eNB FH deadline thread (TID %ld) started on CPU %d\n", gettid(), sched_getcpu() );
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#else // LOW_LATENCY
  int policy, s, j;
  struct sched_param sparam;
  char cpu_affinity[1024];
  cpu_set_t cpuset;

  /* Set affinity mask to include CPUs 1 to MAX_CPUS */
  /* CPU 0 is reserved for UHD */
  /* CPU 1 is reserved for all TX threads */
  /* CPU 2..MAX_CPUS is reserved for all RX threads */
  /* Set CPU Affinity only if number of CPUs >2 */
  CPU_ZERO(&cpuset);
#ifdef CPU_AFFINITY
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  if (get_nprocs() >2) {
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    for (j = 1; j < get_nprocs(); j++)
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      CPU_SET(j, &cpuset);
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    s = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
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    if (s != 0) {
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      perror( "pthread_setaffinity_np");  
      exit_fun (" Error setting processor affinity :");
    }
  }
#endif //CPU_AFFINITY
  /* Check the actual affinity mask assigned to the thread */

  s = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
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  if (s != 0) {
    perror ("pthread_getaffinity_np");
    exit_fun (" Error getting processor affinity :");
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  }
  memset(cpu_affinity,0, sizeof(cpu_affinity));

  for (j = 0; j < CPU_SETSIZE; j++)
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    if (CPU_ISSET(j, &cpuset)) {  
      char temp[1024];
      sprintf (temp, " CPU_%d", j);
      strcat(cpu_affinity, temp);
    }
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  memset(&sparam, 0 , sizeof (sparam)); 
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  sparam.sched_priority = sched_get_priority_max(SCHED_FIFO);
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  policy = SCHED_FIFO ; 
  s = pthread_setschedparam(pthread_self(), policy, &sparam);
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  if (s != 0) {
    perror("pthread_setschedparam : ");
    exit_fun("Error setting thread priority");     
  }
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  memset(&sparam, 0 , sizeof (sparam));

  s = pthread_getschedparam(pthread_self(), &policy, &sparam);
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  if (s != 0) {
    perror("pthread_getschedparam");
    exit_fun("Error getting thread priority");
  }
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  LOG_I(HW, "[SCHED][eNB] FH thread started on CPU %d TID %ld, sched_policy = %s, priority = %d, CPU Affinity = %s\n", sched_getcpu(),gettid(),
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	 (policy == SCHED_FIFO)  ? "SCHED_FIFO" :
	 (policy == SCHED_RR)    ? "SCHED_RR" :
	 (policy == SCHED_OTHER) ? "SCHED_OTHER" :
	 "???",
	 sparam.sched_priority, cpu_affinity);
  
  
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#endif // DEADLINE_SCHEDULER
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  mlockall(MCL_CURRENT | MCL_FUTURE);
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  // wait for top-level synchronization and do one acquisition to get timestamp for setting frame/subframe
  printf( "waiting for sync (eNB_thread_FH)\n");
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  pthread_mutex_lock( &sync_mutex );
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  while (sync_var<0)
    pthread_cond_wait( &sync_cond, &sync_mutex );
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  pthread_mutex_unlock(&sync_mutex);
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  printf( "got sync (eNB_thread)\n" );
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#if defined(ENABLE_ITTI)
  wait_system_ready ("Waiting for eNB application to be ready %s\r", &start_eNB);
#endif 
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  // Create buffer for IF device and free when stopping
  if (eNB->node_function == NGFI_RCC_IF4 || eNB->node_function == NGFI_RRU_IF4) {
    malloc_IF4_buffer(eNB);
    
  } else if (eNB->node_function == NGFI_RRU_IF5 || eNB->node_function == eNodeB_3GPP_BBU) {
    //malloc_IF5_buffer(eNB);

  } else {
    eNB->ifbuffer.tx = NULL;
    eNB->ifbuffer.rx = NULL;
  }

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  // Start IF device for this CC
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  if (eNB->node_function != eNodeB_3GPP) {
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    if (eNB->ifdevice.trx_start_func(&eNB->ifdevice) != 0 ) 
      LOG_E(HW,"Could not start the IF device\n");
  }
  
  // Start RF device for this CC
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  if ((eNB->node_function == eNodeB_3GPP) || 
      (eNB->node_function == NGFI_RRU_IF4) || 
      (eNB->node_function == NGFI_RRU_IF5)) {
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    if (eNB->rfdevice.trx_start_func(&eNB->rfdevice) != 0 ) 
      LOG_E(HW,"Could not start the RF device\n");
  }
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  // This is a forever while loop, it loops over subframes which are scheduled by incoming samples from HW devices
  while (!oai_exit) {
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    if (oai_exit) break;
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    if ((eNB->node_timing == synch_to_other) &&
	((eNB->node_function == NGFI_RRU_IF4) ||
	 (eNB->node_function == NGFI_RRU_IF5) || 
	 (eNB->node_function == eNodeB_3GPP))) {   // This case is for synchronization to another thread
      //wait for event

      // how long should we wait here, for MOBIPASS this could be long
      //      if (pthread_mutex_timedlock(&proc->mutex_FH,&wait) != 0) {
      if (pthread_mutex_lock(&proc->mutex_FH) != 0) {
	LOG_E( PHY, "[SCHED][eNB] error locking mutex for FH\n");
	exit_fun( "error locking mutex" );
	break;
      }
      
      while (proc->instance_cnt_FH < 0) {
	// most of the time the thread is waiting here
	// proc->instance_cnt_prach is -1
	pthread_cond_wait( &proc->cond_FH,&proc->mutex_FH ); // this unlocks mutex_rxtx while waiting and then locks it again
      }
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      proc->instance_cnt_FH++;


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    }
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    // Remaining cases are all for synchronization on FH interface
    else if ((eNB->node_timing == synch_to_ext_device) &&
	     ((eNB->node_function == NGFI_RRU_IF4) ||
	      (eNB->node_function == NGFI_RRU_IF5) || 
	      (eNB->node_function == eNodeB_3GPP))) { // acquisition from RF
      
      for (i=0; i<fp->nb_antennas_rx; i++)
	rxp[i] = (void*)&eNB->common_vars.rxdata[0][i][subframe*fp->samples_per_tti];
      
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 1 );
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      // sanitycheck
      if (subframe==9) { 
	subframe=0;
	frame++;
	frame&=1023;
      } else {
	subframe++;
      }      

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      rxs = eNB->rfdevice.trx_read_func(&eNB->rfdevice,
					&proc->timestamp_rx,
					rxp,
					fp->samples_per_tti,
					fp->nb_antennas_rx);
      proc->frame_rx    = (proc->timestamp_rx / (fp->samples_per_tti*10))&1023;
      proc->subframe_rx = (proc->timestamp_rx / fp->samples_per_tti)%10;
    
      
      if (proc->first_rx == 0) {
	if (proc->subframe_rx != subframe){
          LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->subframe_rx %d, subframe %d)\n",proc->subframe_rx,subframe);
          exit_fun("Exiting");
	}
        if (proc->frame_rx != frame) {
	  LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->frame_rx %d frame %d)\n",proc->frame_rx,frame);
	  exit_fun("Exiting");
	}
      } else {
        proc->first_rx = 0;
      }
      
      //      printf("timestamp_rx %lu, frame %d(%d), subframe %d(%d)\n",proc->timestamp_rx,proc->frame_rx,frame,proc->subframe_rx,subframe);
      
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_TS, proc->timestamp_rx&0xffffffff );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_FRAME_NUMBER_RX_ENB, proc->frame_rx );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_RX_ENB, proc->subframe_rx );
      
      if (rxs != fp->samples_per_tti)
        exit_fun( "problem receiving samples" );
      
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 0 );
      
    }  // node_timing==synch_to_ext_device && node_function == RRU || eNodeB
    else if ((eNB->node_timing == synch_to_ext_device) &&
	       (eNB->node_function == eNodeB_3GPP_BBU)) { // acquisition from IF
      /// **** recv_IF5 of rxdata from RRH **** ///       
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 1 );  
      recv_IF5(eNB, &proc->timestamp_rx, proc->subframe_rx, IF5_RRH_GW_UL); 
      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF5, 0 );  
      
      proc->frame_rx    = (proc->timestamp_rx / (fp->samples_per_tti*10))&1023;
      proc->subframe_rx = (proc->timestamp_rx / fp->samples_per_tti)%10;
      
      if (proc->first_rx == 0) {
	if (proc->subframe_rx != subframe){
	  LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->subframe_rx %d, subframe %d)\n",proc->subframe_rx,subframe);
	  //exit_fun("Exiting");
	}
	if (proc->frame_rx != frame) {
	  LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->frame_rx %d frame %d)\n",proc->frame_rx,frame);
	  //exit_fun("Exiting");
	}
      } else {
	proc->first_rx = 0;
      }
      
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_TS, proc->timestamp_rx&0xffffffff );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_FRAME_NUMBER_RX_ENB, proc->frame_rx );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_RX_ENB, proc->subframe_rx );
    } // eNodeB_3GPP_BBU && node_timing == synch_to_ext_device

    else if ((eNB->node_timing == synch_to_ext_device) &&
	     (eNB->node_function == NGFI_RCC_IF4)) {
      /// **** recv_IF4 of rxdataF from RRU **** ///
      /// **** recv_IF4 of rxsigF from RRU **** ///
      // get frame/subframe information from IF4 interface
      // timed loop (200 us)
      
      symbol_number = 0;
      symbol_mask = 0;
      symbol_mask_full = (1<<fp->symbols_per_tti)-1;
      prach_rx = 0;
         
      do {   // Blocking, we need a timeout on this !!!!!!!!!!!!!!!!!!!!!!!

        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 1 );   
        recv_IF4(eNB, &proc->frame_rx, &proc->subframe_rx, &packet_type, &symbol_number);
        VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_RECV_IF4, 0 );   

        if (packet_type == IF4_PULFFT) {
          symbol_mask = symbol_mask | (1<<symbol_number);     
                       
        } else if (packet_type == IF4_PRACH) {
          // wake up thread for PRACH RX
          prach_rx = 1;
	}



      } while( (symbol_mask != symbol_mask_full) && (prach_rx == 0));    

      if (proc->first_rx == 0) {
        if (proc->subframe_rx != subframe){
          LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->subframe_rx %d, subframe %d)\n",proc->subframe_rx,subframe);
          //exit_fun("Exiting");
        }
        if (proc->frame_rx != frame) {
          LOG_E(PHY,"Received Timestamp doesn't correspond to the time we think it is (proc->frame_rx %d frame %d)\n",proc->frame_rx,frame);
          //exit_fun("Exiting");
        }
      } else {
        proc->first_rx = 0;
      }
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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_TS, proc->timestamp_rx&0xffffffff );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_FRAME_NUMBER_RX_ENB, proc->frame_rx );
      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_RX_ENB, proc->subframe_rx );

		  
    } // node_timing == synch_to_externs, node_function = NGFI_IF4
    else { // should not get here
      AssertFatal(1==0, "Unknown eNB->node_function %d",eNB->node_function);
    }

    // At this point, all information for subframe has been received on FH interface
    // If this proc is to provide synchronization, do so
    for (i=0;i<proc->num_slaves;i++) {
      eNB_proc_t *slave_proc = proc->slave_proc[i];
      // wake up slave FH thread
      // lock the FH mutex and make sure the thread is ready
      if (pthread_mutex_timedlock(&slave_proc->mutex_FH,&wait) != 0) {
	LOG_E( PHY, "[eNB] ERROR pthread_mutex_lock for eNB CCid %d slave CCid %d (IC %d)\n",proc->CC_id,slave_proc->CC_id);
	exit_fun( "error locking mutex_rxtx" );
	break;
      }
      int cnt_slave            = ++slave_proc->instance_cnt_FH;
      slave_proc->frame_rx     = proc->frame_rx;
      slave_proc->subframe_rx  = proc->subframe_rx;
      slave_proc->timestamp_rx = proc->timestamp_rx;
 
      pthread_mutex_unlock( &slave_proc->mutex_FH );
      
      if (cnt_slave == 0) {
	// the thread was presumably waiting where it should and can now be woken up
	if (pthread_cond_signal(&slave_proc->cond_FH) != 0) {
	  LOG_E( PHY, "[eNB] ERROR pthread_cond_signal for eNB CCid %d, slave CCid %d\n",proc->CC_id,slave_proc->CC_id);
	  exit_fun( "ERROR pthread_cond_signal" );
	  break;
	}
      } else {
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	LOG_W( PHY,"[eNB] Frame %d, FH CC_id %d thread busy!! (cnt_FH %i)\n",slave_proc->frame_rx,slave_proc->CC_id, cnt_slave);
	exit_fun( "FH thread busy" );
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	break;
      }             
    }
      
    // wake up RXn_TXnp4 thread for the subframe
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    // choose even or odd thread for RXn-TXnp4 processing 
    eNB_rxtx_proc_t *proc_rxtx = &proc->proc_rxtx[proc->subframe_rx&1];

    // wake up TX for subframe n+4
    // lock the TX mutex and make sure the thread is ready
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    if (pthread_mutex_timedlock(&proc_rxtx->mutex_rxtx,&wait) != 0) {
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      LOG_E( PHY, "[eNB] ERROR pthread_mutex_lock for eNB RXTX thread %d (IC %d)\n", proc_rxtx->subframe_rx&1,proc_rxtx->instance_cnt_rxtx );
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      exit_fun( "error locking mutex_rxtx" );
      break;
    }
    int cnt_rxtx = ++proc_rxtx->instance_cnt_rxtx;
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    // We have just received and processed the common part of a subframe, say n. 
    // TS_rx is the last received timestamp (start of 1st slot), TS_tx is the desired 
    // transmitted timestamp of the next TX slot (first).
    // The last (TS_rx mod samples_pexr_frame) was n*samples_per_tti, 
    // we want to generate subframe (n+3), so TS_tx = TX_rx+3*samples_per_tti,
    // and proc->subframe_tx = proc->subframe_rx+3
    proc_rxtx->timestamp_tx = proc->timestamp_rx + (4*fp->samples_per_tti);
    proc_rxtx->frame_rx     = proc->frame_rx;
    proc_rxtx->subframe_rx  = proc->subframe_rx;
    proc_rxtx->frame_tx     = (proc_rxtx->subframe_rx > 5) ? (proc_rxtx->frame_rx+1)&1023 : proc_rxtx->frame_rx;
    proc_rxtx->subframe_tx  = (proc_rxtx->subframe_rx + 4)%10;
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    pthread_mutex_unlock( &proc_rxtx->mutex_rxtx );
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    if (cnt_rxtx == 0) {
      // the thread was presumably waiting where it should and can now be woken up
      if (pthread_cond_signal(&proc_rxtx->cond_rxtx) != 0) {
        LOG_E( PHY, "[eNB] ERROR pthread_cond_signal for eNB RXn-TXnp4 thread\n");
        exit_fun( "ERROR pthread_cond_signal" );
        break;
      }
    } else {
      LOG_W( PHY,"[eNB] Frame %d, eNB RXn-TXnp4 thread busy!! (cnt_rxtx %i)\n", proc_rxtx->frame_tx, cnt_rxtx );
      exit_fun( "TX thread busy" );
      break;
    }       
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    stop_meas( &softmodem_stats_rxtx_sf );
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#ifdef DEADLINE_SCHEDULER
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    if (opp_enabled){
      if(softmodem_stats_rxtx_sf.diff_now/(cpuf) > attr.sched_runtime){
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	VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_RUNTIME_RXTX_ENB, (softmodem_stats_rxtx_sf.diff_now/cpuf - attr.sched_runtime)/1000000.0);
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      }
    }
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#endif // DEADLINE_SCHEDULER  
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    print_meas_now(&softmodem_stats_rx_sf,"eNB_RX_SF", rx_time_file);
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_PROC_RXTX0+(proc->subframe_rx&1), 0 );
    
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    print_meas_now(&softmodem_stats_rx_sf,"eNB_RX_SF", rx_time_file);
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_PROC_RXTX0+(proc->subframe_rx&1), 0 );
  }
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  if (eNB->node_timing == synch_to_ext_device) {
    proc->instance_cnt_FH--;
    
    if (pthread_mutex_unlock(&proc->mutex_FH) != 0) {
      LOG_E( PHY, "[SCHED][eNB] error unlocking mutex for FH\n");
      exit_fun( "error unlocking mutex" );
    }
  }
    
  printf( "Exiting FH thread \n");
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  eNB_thread_FH_status = 0;
  return &eNB_thread_FH_status;
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}


/*!
 * \brief The prach receive thread of eNB.
 * \param param is a \ref eNB_proc_t structure which contains the info what to process.
 * \returns a pointer to an int. The storage is not on the heap and must not be freed.
 */
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static void* eNB_thread_prach( void* param ) {
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  static int eNB_thread_prach_status;

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  eNB_proc_t *proc = (eNB_proc_t*)param;
  PHY_VARS_eNB *eNB= PHY_vars_eNB_g[0][proc->CC_id];
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  struct timespec wait;

  wait.tv_sec=0;
  wait.tv_nsec=5000000L;

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  // set default return value
  eNB_thread_prach_status = 0;

  MSC_START_USE();
    
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#ifdef DEADLINE_SCHEDULER
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  struct sched_attr attr;
  unsigned int flags = 0;
  uint64_t runtime  = 870000 ;
  uint64_t deadline = 1   *  1000000;
  uint64_t period   = 1   * 10000000; // each prach thread has a period of 10ms from the starting point
 
  attr.size = sizeof(attr);
  attr.sched_flags = 0;
  attr.sched_nice = 0;
  attr.sched_priority = 0;

  attr.sched_policy = SCHED_DEADLINE;
  attr.sched_runtime  = runtime;
  attr.sched_deadline = deadline;
  attr.sched_period   = period; 

  if (sched_setattr(0, &attr, flags) < 0 ) {
    perror("[SCHED] eNB PRACH sched_setattr failed\n");
    return &eNB_thread_prach_status;
  }

  LOG_I( HW, "[SCHED] eNB PRACH deadline thread (TID %ld) started on CPU %d\n", 0, gettid(), sched_getcpu() );
#else // LOW_LATENCY
  int policy, s, j;
  struct sched_param sparam;
  char cpu_affinity[1024];
  cpu_set_t cpuset;

  /* Set affinity mask to include CPUs 1 to MAX_CPUS */
  /* CPU 0 is reserved for UHD */
  /* CPU 1 is reserved for all TX threads */
  /* CPU 2..MAX_CPUS is reserved for all RX threads */
  /* Set CPU Affinity only if number of CPUs >2 */
  CPU_ZERO(&cpuset);
#ifdef CPU_AFFINITY
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  if (get_nprocs() >2) {
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    for (j = 1; j < get_nprocs(); j++)
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      CPU_SET(j, &cpuset);
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    s = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
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    if (s != 0) {
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      perror( "pthread_setaffinity_np");  
      exit_fun (" Error setting processor affinity :");
    }
  }
#endif //CPU_AFFINITY

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  /* Check the actual affinity mask assigned to the thread */
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  s = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
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  if (s != 0) {
    perror ("pthread_getaffinity_np");
    exit_fun (" Error getting processor affinity :");
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  }
  memset(cpu_affinity,0, sizeof(cpu_affinity));

  for (j = 0; j < CPU_SETSIZE; j++)