eNB_scheduler_dlsch.c 90.6 KB
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/*******************************************************************************
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    OpenAirInterface
    Copyright(c) 1999 - 2014 Eurecom
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    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
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    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is
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    included in this distribution in the file called "COPYING". If not,
    see <http://www.gnu.org/licenses/>.
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  Contact Information
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr

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

/*! \file eNB_scheduler_dlsch.c
 * \brief procedures related to eNB for the DLSCH transport channel
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 * \author  Navid Nikaein and Raymond Knopp
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 * \date 2010 - 2014
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 * \email: navid.nikaein@eurecom.fr
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 * \version 1.0
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 * @ingroup _mac

 */

#include "assertions.h"
#include "PHY/defs.h"
#include "PHY/extern.h"

#include "SCHED/defs.h"
#include "SCHED/extern.h"

#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/proto.h"
#include "LAYER2/MAC/extern.h"
#include "UTIL/LOG/log.h"
#include "UTIL/LOG/vcd_signal_dumper.h"
#include "UTIL/OPT/opt.h"
#include "OCG.h"
#include "OCG_extern.h"

#include "RRC/LITE/extern.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"

//#include "LAYER2/MAC/pre_processor.c"
#include "pdcp.h"

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

#define ENABLE_MAC_PAYLOAD_DEBUG
#define DEBUG_eNB_SCHEDULER 1

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extern inline unsigned int taus(void);

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void add_ue_dlsch_info(module_id_t module_idP, int CC_id, int UE_id, sub_frame_t subframeP, UE_DLSCH_STATUS status){
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  eNB_dlsch_info[module_idP][CC_id][UE_id].rnti             = UE_RNTI(module_idP,UE_id);
  //  eNB_dlsch_info[module_idP][CC_id][ue_mod_idP].weight           = weight;
  eNB_dlsch_info[module_idP][CC_id][UE_id].subframe         = subframeP;
  eNB_dlsch_info[module_idP][CC_id][UE_id].status           = status;
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  eNB_dlsch_info[module_idP][CC_id][UE_id].serving_num++;
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}

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int schedule_next_dlue(module_id_t module_idP, int CC_id, sub_frame_t subframeP){
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  int next_ue;
  UE_list_t *UE_list=&eNB_mac_inst[module_idP].UE_list;
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  for (next_ue=UE_list->head; next_ue>=0; next_ue=UE_list->next[next_ue] ){
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    if  (eNB_dlsch_info[module_idP][CC_id][next_ue].status == S_DL_WAITING)
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      return next_ue;
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  }
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  for (next_ue=UE_list->head; next_ue>=0; next_ue=UE_list->next[next_ue] ){
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    if  (eNB_dlsch_info[module_idP][CC_id][next_ue].status == S_DL_BUFFERED) {
      eNB_dlsch_info[module_idP][CC_id][next_ue].status = S_DL_WAITING;
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    }
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  }

  return(-1);//next_ue;
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}

unsigned char generate_dlsch_header(unsigned char *mac_header,
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				    unsigned char num_sdus,
				    unsigned short *sdu_lengths,
				    unsigned char *sdu_lcids,
				    unsigned char drx_cmd,
				    short timing_advance_cmd,
				    unsigned char *ue_cont_res_id,
				    unsigned char short_padding,
				    unsigned short post_padding) {
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  SCH_SUBHEADER_FIXED *mac_header_ptr = (SCH_SUBHEADER_FIXED *)mac_header;
  uint8_t first_element=0,last_size=0,i;
  uint8_t mac_header_control_elements[16],*ce_ptr;

  ce_ptr = &mac_header_control_elements[0];

  // compute header components

  if ((short_padding == 1) || (short_padding == 2)) {
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    mac_header_ptr->R    = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = SHORT_PADDING;
    first_element=1;
    last_size=1;
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  }
  if (short_padding == 2) {
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    mac_header_ptr->E = 1;
    mac_header_ptr++;
    mac_header_ptr->R = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = SHORT_PADDING;
    last_size=1;
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  }

  if (drx_cmd != 255) {
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    if (first_element>0) {
      mac_header_ptr->E = 1;
      mac_header_ptr++;
    }
    else {
      first_element=1;
    }
    mac_header_ptr->R = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = DRX_CMD;
    last_size=1;
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  }

  if (timing_advance_cmd != 0) {
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    if (first_element>0) {
      mac_header_ptr->E = 1;
      mac_header_ptr++;
    }
    else {
      first_element=1;
    }
    mac_header_ptr->R = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = TIMING_ADV_CMD;
    last_size=1;
    //    msg("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);
    ((TIMING_ADVANCE_CMD *)ce_ptr)->R=0;
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    ((TIMING_ADVANCE_CMD *)ce_ptr)->TA=(timing_advance_cmd+31)&0x3f;
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    LOG_D(MAC,"timing advance =%d (%d)\n",timing_advance_cmd,((TIMING_ADVANCE_CMD *)ce_ptr)->TA);
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    ce_ptr+=sizeof(TIMING_ADVANCE_CMD);
    //msg("offset %d\n",ce_ptr-mac_header_control_elements);
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  }

  if (ue_cont_res_id) {
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    if (first_element>0) {
      mac_header_ptr->E = 1;
      /*
	printf("[eNB][MAC] last subheader : %x (R%d,E%d,LCID%d)\n",*(unsigned char*)mac_header_ptr,
	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->R,
	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E,
	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID);
      */
      mac_header_ptr++;
    }
    else {
      first_element=1;
    }
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    mac_header_ptr->R = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = UE_CONT_RES;
    last_size=1;
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    LOG_T(MAC,"[eNB ][RAPROC] Generate contention resolution msg: %x.%x.%x.%x.%x.%x\n",
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          ue_cont_res_id[0],
          ue_cont_res_id[1],
          ue_cont_res_id[2],
          ue_cont_res_id[3],
          ue_cont_res_id[4],
          ue_cont_res_id[5]);

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    memcpy(ce_ptr,ue_cont_res_id,6);
    ce_ptr+=6;
    // msg("(cont_res) : offset %d\n",ce_ptr-mac_header_control_elements);
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  }

  //msg("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);

  for (i=0;i<num_sdus;i++) {
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    LOG_T(MAC,"[eNB] Generate DLSCH header num sdu %d len sdu %d\n",num_sdus, sdu_lengths[i]);
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    if (first_element>0) {
      mac_header_ptr->E = 1;
      /*msg("last subheader : %x (R%d,E%d,LCID%d)\n",*(unsigned char*)mac_header_ptr,
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	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->R,
	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E,
	((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID);
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      */
      mac_header_ptr+=last_size;
      //msg("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);
    }
    else {
      first_element=1;
    }
    if (sdu_lengths[i] < 128) {
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->E    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->LCID = sdu_lcids[i];
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L    = (unsigned char)sdu_lengths[i];
      last_size=2;
    }
    else {
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->R    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->E    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F    = 1;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->LCID = sdu_lcids[i];
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_MSB    = ((unsigned short) sdu_lengths[i]>>8)&0x7f;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_LSB    = (unsigned short) sdu_lengths[i]&0xff;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->padding   = 0x00;
      last_size=3;
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#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[eNB] generate long sdu, size %x (MSB %x, LSB %x)\n",
	    sdu_lengths[i],
	    ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_MSB,
	    ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_LSB);
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#endif
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    }
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  }
  /*

    printf("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);

    printf("last subheader : %x (R%d,E%d,LCID%d)\n",*(unsigned char*)mac_header_ptr,
    ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->R,
    ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E,
    ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID);


    if (((SCH_SUBHEADER_FIXED*)mac_header_ptr)->LCID < UE_CONT_RES) {
    if (((SCH_SUBHEADER_SHORT*)mac_header_ptr)->F == 0)
    printf("F = 0, sdu len (L field) %d\n",(((SCH_SUBHEADER_SHORT*)mac_header_ptr)->L));
    else
    printf("F = 1, sdu len (L field) %d\n",(((SCH_SUBHEADER_LONG*)mac_header_ptr)->L));
    }
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  */
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  if (post_padding>0) {// we have lots of padding at the end of the packet
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    mac_header_ptr->E = 1;
    mac_header_ptr+=last_size;
    // add a padding element
    mac_header_ptr->R    = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = SHORT_PADDING;
    mac_header_ptr++;
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  }
  else { // no end of packet padding
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    // last SDU subhead is of fixed type (sdu length implicitly to be computed at UE)
    mac_header_ptr++;
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  }

  //msg("After subheaders %d\n",(uint8_t*)mac_header_ptr - mac_header);

  if ((ce_ptr-mac_header_control_elements) > 0) {
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    // printf("Copying %d bytes for control elements\n",ce_ptr-mac_header_control_elements);
    memcpy((void*)mac_header_ptr,mac_header_control_elements,ce_ptr-mac_header_control_elements);
    mac_header_ptr+=(unsigned char)(ce_ptr-mac_header_control_elements);
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  }
  //msg("After CEs %d\n",(uint8_t*)mac_header_ptr - mac_header);

  return((unsigned char*)mac_header_ptr - mac_header);

}

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void set_ul_DAI(int module_idP,int UE_idP, int CC_idP,  int frameP, int subframeP, LTE_DL_FRAME_PARMS  *frame_parms[MAX_NUM_CCs]) {
 
  eNB_MAC_INST         *eNB      = &eNB_mac_inst[module_idP];
  UE_list_t            *UE_list  = &eNB->UE_list;
  unsigned char         DAI;
 
  if (frame_parms[CC_idP]->frame_type == TDD) {
    DAI = (UE_list->UE_template[CC_idP][UE_idP].DAI-1)&3;
    LOG_D(MAC,"[eNB %d] Frame %d, subframe %d: DAI %d for UE %d\n",module_idP,frameP,subframeP,DAI,UE_idP);
    // Save DAI for Format 0 DCI
    
    switch (frame_parms[CC_idP]->tdd_config) {
    case 0:
      //      if ((subframeP==0)||(subframeP==1)||(subframeP==5)||(subframeP==6))
      break;
    case 1:
      switch (subframeP) {
      case 1:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[7] = DAI;
	break;
      case 4:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[8] = DAI;
	break;
      case 6:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
	break;
      case 9:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[3] = DAI;
	break;
      }
    case 2:
      //      if ((subframeP==3)||(subframeP==8))
      //	UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
      break;
    case 3:
      //if ((subframeP==6)||(subframeP==8)||(subframeP==0)) {
      //  LOG_D(MAC,"schedule_ue_spec: setting UL DAI to %d for subframeP %d => %d\n",DAI,subframeP, ((subframeP+8)%10)>>1);
      //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul[((subframeP+8)%10)>>1] = DAI;
      //}
     switch (subframeP) {
      case 5:
      case 6:
      case 1:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
	break;
      case 7:
      case 8:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[3] = DAI;
	break;
      case 9:
      case 0:
	UE_list->UE_template[CC_idP][UE_idP].DAI_ul[4] = DAI;
	break;
      default:
	break;
      }
      
      break;
    case 4:
      //      if ((subframeP==8)||(subframeP==9))
      //	UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
      break;
    case 5:
      //      if (subframeP==8)
      //	UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
      break;
    case 6:
      //      if ((subframeP==1)||(subframeP==4)||(subframeP==6)||(subframeP==9))
      //	UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
      break;
    default:
      break;
    }
  }
}

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void schedule_ue_spec(module_id_t   module_idP,
                      frame_t       frameP,
                      sub_frame_t   subframeP,
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                      unsigned int  *nb_rb_used0,
                      unsigned int  *nCCE_used,
                      int           *mbsfn_flag) {

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  uint8_t               CC_id;
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  int                   UE_id;
  uint16_t              nCCE[MAX_NUM_CCs];
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  int                   N_RBG[MAX_NUM_CCs];
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  unsigned char         aggregation;
  mac_rlc_status_resp_t rlc_status;
  unsigned char         header_len_dcch=0, header_len_dcch_tmp=0,header_len_dtch=0,header_len_dtch_tmp=0, ta_len=0;
  unsigned char         sdu_lcids[11],offset,num_sdus=0;
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  uint16_t              nb_rb,nb_rb_temp,total_nb_available_rb[MAX_NUM_CCs],nb_available_rb; 
  uint16_t              TBS,j,sdu_lengths[11],rnti,padding=0,post_padding=0;
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  unsigned char         dlsch_buffer[MAX_DLSCH_PAYLOAD_BYTES];
  unsigned char         round            = 0;
  unsigned char         harq_pid         = 0;
  void                 *DLSCH_dci        = NULL;
  LTE_eNB_UE_stats     *eNB_UE_stats     = NULL;
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  uint16_t              sdu_length_total = 0;
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  unsigned char         DAI;
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  int                   i                = 0;
  uint8_t               dl_pow_off[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
  unsigned char         rballoc_sub_UE[MAX_NUM_CCs][NUMBER_OF_UE_MAX][N_RBG_MAX];
  uint16_t              pre_nb_available_rbs[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
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  int                   mcs;
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  uint16_t              min_rb_unit[MAX_NUM_CCs];
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  short                 ta_update        = 0;
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  eNB_MAC_INST         *eNB      = &eNB_mac_inst[module_idP];
  UE_list_t            *UE_list  = &eNB->UE_list;
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  LTE_DL_FRAME_PARMS   *frame_parms[MAX_NUM_CCs];
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  int                   continue_flag=0;

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  if (UE_list->head==-1)
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    return;
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  start_meas(&eNB->schedule_dlsch);
  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_SCHEDULE_DLSCH,VCD_FUNCTION_IN);
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  //weight = get_ue_weight(module_idP,UE_id);
  aggregation = 1; // set to the maximum aggregation level

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  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
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    min_rb_unit[CC_id]=get_min_rb_unit(module_idP,CC_id);
    frame_parms[CC_id] = mac_xface->get_lte_frame_parms(module_idP,CC_id); 
    total_nb_available_rb[CC_id] = frame_parms[CC_id]->N_RB_DL - nb_rb_used0[CC_id];
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    nCCE[CC_id] = mac_xface->get_nCCE_max(module_idP,CC_id) - nCCE_used[CC_id];
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    N_RBG[CC_id] = frame_parms[CC_id]->N_RBG;

    // store the global enb stats: 
    eNB->eNB_stats[CC_id].num_dlactive_UEs =  UE_list->num_UEs;
    eNB->eNB_stats[CC_id].available_prbs =  total_nb_available_rb[CC_id];
    eNB->eNB_stats[CC_id].total_available_prbs +=  total_nb_available_rb[CC_id];
    eNB->eNB_stats[CC_id].available_ncces = nCCE[CC_id];
    eNB->eNB_stats[CC_id].dlsch_bytes_tx=0;
    eNB->eNB_stats[CC_id].dlsch_pdus_tx=0;
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  }
   
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  /// CALLING Pre_Processor for downlink scheduling (Returns estimation of RBs required by each UE and the allocation on sub-band)
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_DLSCH_PREPROCESSOR,VCD_FUNCTION_IN);
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  start_meas(&eNB->schedule_dlsch_preprocessor);
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  dlsch_scheduler_pre_processor(module_idP,
				frameP,
				subframeP,
				dl_pow_off,
				pre_nb_available_rbs,
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				N_RBG,
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				rballoc_sub_UE,
				mbsfn_flag);
  stop_meas(&eNB->schedule_dlsch_preprocessor);
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_DLSCH_PREPROCESSOR,VCD_FUNCTION_OUT);
 
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  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
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    LOG_D(MAC, "doing schedule_ue_spec for CC_id %d\n",CC_id);
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    if (mbsfn_flag[CC_id]>0)
      continue;
    for (UE_id=UE_list->head;UE_id>=0;UE_id=UE_list->next[UE_id]) {
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      rnti = UE_RNTI(module_idP,UE_id);
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      eNB_UE_stats = mac_xface->get_eNB_UE_stats(module_idP,CC_id,rnti);
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      if (rnti==0) {
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	LOG_D(MAC,"Cannot find rnti for UE_id %d (num_UEs %d)\n",UE_id,UE_list->num_UEs);
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	// mac_xface->macphy_exit("Cannot find rnti for UE_id");
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	continue_flag=1;
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      }
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      if (eNB_UE_stats==NULL) {
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	LOG_D(MAC,"[eNB] Cannot find eNB_UE_stats\n");
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	//	mac_xface->macphy_exit("[MAC][eNB] Cannot find eNB_UE_stats\n");
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	continue_flag=1; 
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      }
      if ((pre_nb_available_rbs[CC_id][UE_id] == 0) || (nCCE[CC_id] < (1<<aggregation))) {
	LOG_D(MAC,"[eNB %d] Frame %d : no RB allocated for UE %d on CC_id %d: continue \n",
	      module_idP, frameP, UE_id, CC_id, nb_rb_used0[CC_id], pre_nb_available_rbs[CC_id][UE_id], nCCE[CC_id], aggregation);
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	//if(mac_xface->get_transmission_mode(module_idP,rnti)==5)
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	continue_flag=1; //to next user (there might be rbs availiable for other UEs in TM5
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	// else
	//	break;
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      }
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      if (frame_parms[CC_id]->frame_type == TDD)  {
	set_ue_dai (subframeP,
		    frame_parms[CC_id]->tdd_config,
		    UE_id,
		    CC_id,
		    UE_list);
	// update UL DAI after DLSCH scheduling
	set_ul_DAI(module_idP,UE_id,CC_id,frameP,subframeP,frame_parms);

      }

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      if (continue_flag == 1 ){
	add_ue_dlsch_info(module_idP,
			  CC_id,
			  UE_id,
			  subframeP,
			  S_DL_NONE);
	continue;
      }
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      nb_available_rb = pre_nb_available_rbs[CC_id][UE_id];
      UE_list->eNB_UE_stats[CC_id][UE_id].crnti= rnti;
      UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status=mac_get_rrc_status(module_idP,1,UE_id);
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      mac_xface->get_ue_active_harq_pid(module_idP,CC_id,rnti,frameP,subframeP,&harq_pid,&round,0);
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      UE_list->eNB_UE_stats[CC_id][UE_id].harq_pid = harq_pid;
      UE_list->eNB_UE_stats[CC_id][UE_id].harq_round = round;
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      sdu_length_total=0;
      num_sdus=0;
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      /*	
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	DevCheck(((eNB_UE_stats->DL_cqi[0] < MIN_CQI_VALUE) || (eNB_UE_stats->DL_cqi[0] > MAX_CQI_VALUE)), 
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	eNB_UE_stats->DL_cqi[0], MIN_CQI_VALUE, MAX_CQI_VALUE);
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	*/
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      eNB_UE_stats->dlsch_mcs1 = cqi_to_mcs[eNB_UE_stats->DL_cqi[0]];
      eNB_UE_stats->dlsch_mcs1 = cmin(eNB_UE_stats->dlsch_mcs1, openair_daq_vars.target_ue_dl_mcs);	

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#ifdef EXMIMO
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      if (mac_xface->get_transmission_mode(module_idP,CC_id, rnti)==5)
	eNB_UE_stats->dlsch_mcs1 = cmin(eNB_UE_stats->dlsch_mcs1,16);
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#endif
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      // store stats
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      UE_list->eNB_UE_stats[CC_id][UE_id].dl_cqi= eNB_UE_stats->DL_cqi[0];
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      // initializing the rb allocation indicator for each UE
      for(j=0;j<frame_parms[CC_id]->N_RBG;j++){ 
	UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j] = 0;
      }

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      LOG_D(MAC,"[eNB %d] Frame %d: Scheduling UE %d on CC_id %d (rnti %x, harq_pid %d, round %d, rb %d, cqi %d, mcs %d, ncc %d, rrc %d)\n",
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	    module_idP, frameP, UE_id,CC_id,rnti,harq_pid, round,nb_available_rb,
	    eNB_UE_stats->DL_cqi[0], eNB_UE_stats->dlsch_mcs1,
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	    nCCE[CC_id],
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	    UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status);
                
     
      // Note this code is for a specific DCI format
      DLSCH_dci = (void *)UE_list->UE_template[CC_id][UE_id].DLSCH_DCI[harq_pid];
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      /* process retransmission  */

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      if (round > 0) {
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	if (frame_parms[CC_id]->frame_type == TDD) {
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	  UE_list->UE_template[CC_id][UE_id].DAI++;
	  update_ul_dci(module_idP,CC_id,rnti,UE_list->UE_template[CC_id][UE_id].DAI);
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	  LOG_D(MAC,"DAI update: subframeP %d: UE %d, DAI %d\n",
		subframeP,UE_id,UE_list->UE_template[CC_id][UE_id].DAI);
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	}
	
	// get freq_allocation
	nb_rb = UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid];
	if (nb_rb <= nb_available_rb) {
	  
	  if(nb_rb == pre_nb_available_rbs[CC_id][UE_id]){
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	    for(j=0;j<frame_parms[CC_id]->N_RBG;j++) // for indicating the rballoc for each sub-band
	      UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j] = rballoc_sub_UE[CC_id][UE_id][j];
	  } else {
	    nb_rb_temp = nb_rb;
	    j = 0;
	    while((nb_rb_temp > 0) && (j<frame_parms[CC_id]->N_RBG)){
	      if(rballoc_sub_UE[CC_id][UE_id][j] == 1){
		UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j] = rballoc_sub_UE[CC_id][UE_id][j];
		if((j == frame_parms[CC_id]->N_RBG-1) &&
		   ((frame_parms[CC_id]->N_RB_DL == 25)||
		    (frame_parms[CC_id]->N_RB_DL == 50)))
		  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id]+1;
		else
		  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id];
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	      }
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	      j = j+1;
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	    }
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	  }
	  
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	  nb_available_rb -= nb_rb;
	  aggregation = process_ue_cqi(module_idP,UE_id);
	  nCCE[CC_id]-=(1<<aggregation); // adjust the remaining nCCE
	  nCCE_used[CC_id] += (1<<aggregation);
	      
	      
	  PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].pre_nb_available_rbs = nb_rb;
	  PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].dl_pow_off = dl_pow_off[CC_id][UE_id];
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	  for(j=0;j<frame_parms[CC_id]->N_RBG;j++)
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	    PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].rballoc_sub[j] = UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j];
	      
	  switch (mac_xface->get_transmission_mode(module_idP,CC_id,rnti)) {
	  case 1:
	  case 2:
	  default:
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	    switch (frame_parms[CC_id]->N_RB_DL) {
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	    case 6:
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	      if (frame_parms[CC_id]->frame_type == TDD) {
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		//	      ((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->rv       = round&3;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, dai %d, mcs %d\n",module_idP,harq_pid,round,(UE_list->UE_template[CC_id][UE_id].DAI-1),((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->mcs);
	      }
	      else {
		//	      ((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->rv       = round&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, mcs %d\n",module_idP,harq_pid,round,((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->mcs);
		    
	      }
	      break;
	    case 25:
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	      if (frame_parms[CC_id]->frame_type == TDD) {
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		//	      ((DCI1_5MHz_TDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->rv       = round&3;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, dai %d, mcs %d\n",module_idP,harq_pid,round,(UE_list->UE_template[CC_id][UE_id].DAI-1),((DCI1_5MHz_TDD_t*)DLSCH_dci)->mcs);
	      }
	      else {
		//	      ((DCI1_5MHz_FDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->rv       = round&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, mcs %d\n",module_idP,harq_pid,round,((DCI1_5MHz_FDD_t*)DLSCH_dci)->mcs);
		    
	      }
	      break;
	    case 50:
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	      if (frame_parms[CC_id]->frame_type == TDD) {
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		//	      ((DCI1_10MHz_TDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->rv       = round&3;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, dai %d, mcs %d\n",module_idP,harq_pid,round,(UE_list->UE_template[CC_id][UE_id].DAI-1),((DCI1_10MHz_TDD_t*)DLSCH_dci)->mcs);
	      }
	      else {
		//	      ((DCI1_10MHz_FDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->rv       = round&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, mcs %d\n",module_idP,harq_pid,round,((DCI1_10MHz_FDD_t*)DLSCH_dci)->mcs);
		    
	      }
	      break;
	    case 100:
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	      if (frame_parms[CC_id]->frame_type == TDD) {
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		//	      ((DCI1_20MHz_TDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->rv       = round&3;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, dai %d, mcs %d\n",module_idP,harq_pid,round,(UE_list->UE_template[CC_id][UE_id].DAI-1),((DCI1_20MHz_TDD_t*)DLSCH_dci)->mcs);
	      }
	      else {
		//	      ((DCI1_20MHz_FDD_t*)DLSCH_dci)->ndi      = 0;
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->rv       = round&3;
		LOG_D(MAC,"[eNB %d] Retransmission : harq_pid %d, round %d, mcs %d\n",module_idP,harq_pid,round,((DCI1_20MHz_FDD_t*)DLSCH_dci)->mcs);
		    
	      }
	      break;
	    }
	    break;
	  case 4:
	    //	  if (nb_rb>10) {
	    ((DCI2_5MHz_2A_TDD_t*)DLSCH_dci)->ndi1 = 0;
	    ((DCI2_5MHz_2A_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
	    ((DCI2_5MHz_2A_TDD_t*)DLSCH_dci)->dai = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
	    // }
	    //else {
	    //  ((DCI2_5MHz_2A_L10PRB_TDD_t*)DLSCH_dci)->ndi1 = 0;
	    // ((DCI2_5MHz_2A_L10PRB_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
	    // ((DCI2_5MHz_2A_L10PRB_TDD_t*)DLSCH_dci)->rv1 = round&3;
	    // ((DCI2_5MHz_2A_L10PRB_TDD_t*)DLSCH_dci)->dai = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
	    // }
	    break;
	  case 5:
	    // if(nb_rb>10){
	    //((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->mcs = eNB_UE_stats->DL_cqi[0]<<1;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->ndi = 0;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->rv = round&3;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->dai = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
	    if(dl_pow_off[CC_id][UE_id] == 2)
	      dl_pow_off[CC_id][UE_id] = 1;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->dl_power_off = dl_pow_off[CC_id][UE_id];
	    // }
	    break;
	  case 6:
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->ndi = 0;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->rv = round&3;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->dai = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
	    ((DCI1E_5MHz_2A_M10PRB_TDD_t*)DLSCH_dci)->dl_power_off = 1;//dl_pow_off[UE_id];
	    break;
	  }
	      
	  add_ue_dlsch_info(module_idP,
			    CC_id,
			    UE_id,
			    subframeP,
			    S_DL_SCHEDULED);
	  
	  //eNB_UE_stats->dlsch_trials[round]++;
	  UE_list->eNB_UE_stats[CC_id][UE_id].num_retransmission+=1;
	  UE_list->eNB_UE_stats[CC_id][UE_id].rbs_used_retx=nb_rb;
	  UE_list->eNB_UE_stats[CC_id][UE_id].total_rbs_used_retx+=nb_rb;
	  UE_list->eNB_UE_stats[CC_id][UE_id].ncce_used_retx=nCCE[CC_id];
	  UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs1=eNB_UE_stats->dlsch_mcs1;
	  UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs2=eNB_UE_stats->dlsch_mcs1;
	}
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	else { 
	  LOG_D(MAC,"[eNB %d] Frame %d : don't schedule UE %d, its retransmission takes more resources than we have\n", module_idP, frameP, UE_id);
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	}
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      }
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      else {  /* This is a potentially new SDU opportunity */ 
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	rlc_status.bytes_in_buffer = 0;
	// Now check RLC information to compute number of required RBs
	// get maximum TBS size for RLC request
	//TBS = mac_xface->get_TBS(eNB_UE_stats->DL_cqi[0]<<1,nb_available_rb);
	TBS = mac_xface->get_TBS_DL(eNB_UE_stats->dlsch_mcs1,nb_available_rb);
	// check first for RLC data on DCCH
	// add the length for  all the control elements (timing adv, drx, etc) : header + payload
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	//#ifndef EXMIMO_IOT
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        // to be checked by RK, NN, FK
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        uint8_t update_TA=4;
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        switch (frame_parms[CC_id]->N_RB_DL) 
        {
        case 6:
          update_TA = 1;
          break;
        case 25:
          update_TA = 4;
          break;
        case 50:
          update_TA = 8;
          break;
        case 100:
          update_TA = 16;
          break;
       }        
	ta_len = ((eNB_UE_stats->timing_advance_update/update_TA)!=0) ? 2 : 0;
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	/*#else
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	ta_len = 0;
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	#endif*/
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	header_len_dcch = 2; // 2 bytes DCCH SDU subheader
	
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	if ( TBS-ta_len-header_len_dcch > 0 ) 
	  {
	  rlc_status = mac_rlc_status_ind(
					  module_idP,
					  UE_id,
					  frameP,
					  ENB_FLAG_YES,
					  MBMS_FLAG_NO,
					  DCCH,
					  (TBS-ta_len-header_len_dcch)); // transport block set size
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	  sdu_lengths[0]=0;
	  if (rlc_status.bytes_in_buffer > 0) {  // There is DCCH to transmit
	    LOG_D(MAC,"[eNB %d] Frame %d, DL-DCCH->DLSCH, Requesting %d bytes from RLC (RRC message)\n",module_idP,frameP,TBS-header_len_dcch);
	    sdu_lengths[0] += mac_rlc_data_req(
					       module_idP,
					       UE_id,
					       frameP,
					       ENB_FLAG_YES,
					       MBMS_FLAG_NO,
					       DCCH,
					       (char *)&dlsch_buffer[sdu_lengths[0]]);
	    
	    LOG_D(MAC,"[eNB %d][DCCH] Got %d bytes from RLC\n",module_idP,sdu_lengths[0]);
	    sdu_length_total = sdu_lengths[0];
	    sdu_lcids[0] = DCCH;
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_pdu_tx[DCCH]+=1;
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_bytes_tx[DCCH]+=sdu_lengths[0];
	    num_sdus = 1;
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#ifdef DEBUG_eNB_SCHEDULER
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	    LOG_T(MAC,"[eNB %d][DCCH] Got %d bytes :",module_idP,sdu_lengths[0]);
	    for (j=0;j<sdu_lengths[0];j++)
	      LOG_T(MAC,"%x ",dlsch_buffer[j]);
	    LOG_T(MAC,"\n");
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#endif
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	  }
	  else {
	    header_len_dcch = 0;
	    sdu_length_total = 0;
	  }
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	}
	// check for DCCH1 and update header information (assume 2 byte sub-header)
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	  if (TBS-ta_len-header_len_dcch-sdu_length_total > 0 ) 
	  {
	  rlc_status = mac_rlc_status_ind(
					  module_idP,
					  UE_id,
					  frameP,
					  ENB_FLAG_YES,
					  MBMS_FLAG_NO,
					  DCCH+1,
					  (TBS-ta_len-header_len_dcch-sdu_length_total)); // transport block set size less allocations for timing advance and
	  // DCCH SDU
	  
	  if (rlc_status.bytes_in_buffer > 0) 
	    {
	    LOG_D(MAC,"[eNB %d], Frame %d, DCCH1->DLSCH, Requesting %d bytes from RLC (RRC message)\n",
		  module_idP,frameP,TBS-header_len_dcch-sdu_length_total);
	    sdu_lengths[num_sdus] += mac_rlc_data_req(
						      module_idP,
						      UE_id,
						      frameP,
						      ENB_FLAG_YES,
						      MBMS_FLAG_NO,
						      DCCH+1,
						      (char *)&dlsch_buffer[sdu_lengths[0]]);
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	    sdu_lcids[num_sdus] = DCCH1;
	    sdu_length_total += sdu_lengths[num_sdus];
	    header_len_dcch += 2;
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_pdu_tx[DCCH1]+=1;
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_bytes_tx[DCCH1]+=sdu_lengths[num_sdus];
	    num_sdus++;
	    LOG_D(MAC,"[eNB %d] Got %d bytes for DCCH from RLC\n",module_idP,sdu_lengths[0]);
	  }
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	}
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	  // check for DTCH and update header information
	  // here we should loop over all possible DTCH
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	header_len_dtch = 3; // 3 bytes DTCH SDU subheader
	
	LOG_D(MAC,"[eNB %d], Frame %d, DTCH->DLSCH, Checking RLC status (rab %d, tbs %d, len %d)\n",
	      module_idP,frameP,DTCH,TBS,
	      TBS-ta_len-header_len_dcch-sdu_length_total-header_len_dtch);
	
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	if (TBS-ta_len-header_len_dcch-sdu_length_total-header_len_dtch > 0 ) 
	  {
	  rlc_status = mac_rlc_status_ind(
					  module_idP,
					  UE_id,
					  frameP,
					  ENB_FLAG_YES,
					  MBMS_FLAG_NO,
					  DTCH,
					  TBS-ta_len-header_len_dcch-sdu_length_total-header_len_dtch);
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	  if (rlc_status.bytes_in_buffer > 0) {
	    
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	    LOG_D(MAC,"[eNB %d][USER-PLANE DEFAULT DRB], Frame %d, DTCH->DLSCH, Requesting %d bytes from RLC (hdr len dtch %d)\n",
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		  module_idP,frameP,TBS-header_len_dcch-sdu_length_total-header_len_dtch,header_len_dtch);
	    sdu_lengths[num_sdus] = mac_rlc_data_req(
						     module_idP,
						     UE_id,
						     frameP,
						     ENB_FLAG_YES,
						     MBMS_FLAG_NO,
						     DTCH,
						     (char*)&dlsch_buffer[sdu_length_total]);
	    
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	    LOG_D(MAC,"[eNB %d][USER-PLANE DEFAULT DRB] Got %d bytes for DTCH %d \n",module_idP,sdu_lengths[num_sdus],DTCH);
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	    sdu_lcids[num_sdus] = DTCH;
	    sdu_length_total += sdu_lengths[num_sdus];
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_pdu_tx[DTCH]+=1;
	    UE_list->eNB_UE_stats[CC_id][UE_id].num_bytes_tx[DTCH]+=sdu_lengths[num_sdus];
	    if (sdu_lengths[num_sdus] < 128) {
	      header_len_dtch=2;
	    }
	    num_sdus++;
	  }
	  else {
	    header_len_dtch = 0;
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	  }
	}
	
	// there is a payload
	if (((sdu_length_total + header_len_dcch + header_len_dtch )> 0)) {
	  
	  // Now compute number of required RBs for total sdu length
	  // Assume RAH format 2
	  // adjust  header lengths
	  header_len_dcch_tmp = header_len_dcch;
	  header_len_dtch_tmp = header_len_dtch;
	  if (header_len_dtch==0) {
	    header_len_dcch = (header_len_dcch >0) ? 1 : header_len_dcch;  // remove length field
	  } else {
	    header_len_dtch = (header_len_dtch > 0) ? 1 :header_len_dtch;     // remove length field for the last SDU
	  }
	  
	  
	  mcs = eNB_UE_stats->dlsch_mcs1;
	  if (mcs==0) nb_rb = 4;   // don't let the TBS get too small
	  else nb_rb=min_rb_unit[CC_id];
	  
	  TBS = mac_xface->get_TBS_DL(mcs,nb_rb);
	  
	  while (TBS < (sdu_length_total + header_len_dcch + header_len_dtch + ta_len))  {
	    nb_rb += min_rb_unit[CC_id];  //
	    if (nb_rb>nb_available_rb) { // if we've gone beyond the maximum number of RBs
	      // (can happen if N_RB_DL is odd)
	      TBS = mac_xface->get_TBS_DL(eNB_UE_stats->dlsch_mcs1,nb_available_rb);
	      nb_rb = nb_available_rb;
	      break;
	    }
	    TBS = mac_xface->get_TBS_DL(eNB_UE_stats->dlsch_mcs1,nb_rb);
	  }
	  
	  if(nb_rb == pre_nb_available_rbs[CC_id][UE_id]) {
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	    for(j=0;j<frame_parms[CC_id]->N_RBG;j++) {// for indicating the rballoc for each sub-band
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	      UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j] = rballoc_sub_UE[CC_id][UE_id][j];
	    }
	  } else
	    {
	      nb_rb_temp = nb_rb;
	      j = 0;
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	      while((nb_rb_temp > 0) && (j<frame_parms[CC_id]->N_RBG)){
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		if(rballoc_sub_UE[CC_id][UE_id][j] == 1){
		  UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j] = rballoc_sub_UE[CC_id][UE_id][j];
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		  if ((j == frame_parms[CC_id]->N_RBG-1) &&
		      ((frame_parms[CC_id]->N_RB_DL == 25)||
		       (frame_parms[CC_id]->N_RB_DL == 50)))
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		    nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id]+1;
		  else
		    nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id];
		}
		j = j+1;
	      }
	    }
	  
	  PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].pre_nb_available_rbs = nb_rb;
	  PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].dl_pow_off = dl_pow_off[CC_id][UE_id];
	  
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	  for(j=0;j<frame_parms[CC_id]->N_RBG;j++)
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	    PHY_vars_eNB_g[module_idP][CC_id]->mu_mimo_mode[UE_id].rballoc_sub[j] = UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j];
	  
	  
	  // decrease mcs until TBS falls below required length
	  while ((TBS > (sdu_length_total + header_len_dcch + header_len_dtch + ta_len)) && (mcs>0)) {
	    mcs--;
	    TBS = mac_xface->get_TBS_DL(mcs,nb_rb);
	  }
	  
	  // if we have decreased too much or we don't have enough RBs, increase MCS
	  while ((TBS < (sdu_length_total + header_len_dcch + header_len_dtch + ta_len)) && ((( dl_pow_off[CC_id][UE_id]>0) && (mcs<28)) || ( (dl_pow_off[CC_id][UE_id]==0) && (mcs<=15)))) {
	    mcs++;
	    TBS = mac_xface->get_TBS_DL(mcs,nb_rb);
	  }
	  
	  LOG_D(MAC,"dlsch_mcs before and after the rate matching = (%d, %d)\n",eNB_UE_stats->dlsch_mcs1, mcs);
	  
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#ifdef DEBUG_eNB_SCHEDULER
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	  LOG_D(MAC,"[eNB %d] Generated DLSCH header (mcs %d, TBS %d, nb_rb %d)\n",
		module_idP,mcs,TBS,nb_rb);
	  // msg("[MAC][eNB ] Reminder of DLSCH with random data %d %d %d %d \n",
	  //	TBS, sdu_length_total, offset, TBS-sdu_length_total-offset);
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#endif
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	  if ((TBS - header_len_dcch - header_len_dtch - sdu_length_total - ta_len) <= 2) {
	    padding = (TBS - header_len_dcch - header_len_dtch - sdu_length_total - ta_len);
	    post_padding = 0;
	  }
	  else {
	    padding = 0;
	    // adjust the header len
	    if (header_len_dtch==0)
	      header_len_dcch = header_len_dcch_tmp;
	    else //if (( header_len_dcch==0)&&((header_len_dtch==1)||(header_len_dtch==2)))
	      header_len_dtch = header_len_dtch_tmp;
	    
	    post_padding = TBS - sdu_length_total - header_len_dcch - header_len_dtch - ta_len ; // 1 is for the postpadding header
	  }
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	  //#ifndef EXMIMO_IOT
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	  ta_update = eNB_UE_stats->timing_advance_update/update_TA;
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	  /*#else
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	  ta_update = 0;
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	  #endif*/
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	  offset = generate_dlsch_header((unsigned char*)UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0],
					 // offset = generate_dlsch_header((unsigned char*)eNB_mac_inst[0].DLSCH_pdu[0][0].payload[0],
					 num_sdus,              //num_sdus
					 sdu_lengths,  //
					 sdu_lcids,
					 255,                                   // no drx
					 ta_update, // timing advance
					 NULL,                                  // contention res id
					 padding,
					 post_padding);
	  //#ifdef DEBUG_eNB_SCHEDULER
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	  if (ta_update) {
	  LOG_I(MAC,"[eNB %d][DLSCH] Frame %d Generate header for UE_id %d on CC_id %d: sdu_length_total %d, num_sdus %d, sdu_lengths[0] %d, sdu_lcids[0] %d => payload offset %d,timing advance value : %d, padding %d,post_padding %d,(mcs %d, TBS %d, nb_rb %d),header_dcch %d, header_dtch %d\n",
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		module_idP,frameP, UE_id, CC_id, sdu_length_total,num_sdus,sdu_lengths[0],sdu_lcids[0],offset,
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		ta_update,padding,post_padding,mcs,TBS,nb_rb,header_len_dcch,header_len_dtch);
	  }
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	  //#endif
	  
	  LOG_T(MAC,"[eNB %d] First 16 bytes of DLSCH : \n");
	  for (i=0;i<16;i++)
	    LOG_T(MAC,"%x.",dlsch_buffer[i]);
	  LOG_T(MAC,"\n");
	  
	  // cycle through SDUs and place in dlsch_buffer
	  memcpy(&UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0][offset],dlsch_buffer,sdu_length_total);
	  // memcpy(&eNB_mac_inst[0].DLSCH_pdu[0][0].payload[0][offset],dcch_buffer,sdu_lengths[0]);
	  
	  // fill remainder of DLSCH with random data
	  for (j=0;j<(TBS-sdu_length_total-offset);j++)
	    UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0][offset+sdu_length_total+j] = (char)(taus()&0xff);
	  //eNB_mac_inst[0].DLSCH_pdu[0][0].payload[0][offset+sdu_lengths[0]+j] = (char)(taus()&0xff);
	  
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#if defined(USER_MODE) && defined(OAI_EMU)
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	  /* Tracing of PDU is done on UE side */
	  if (oai_emulation.info.opt_enabled)
	    trace_pdu(1, (uint8_t *)UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0],
		      TBS, module_idP, 3, UE_RNTI(module_idP,UE_id),
		      eNB->subframe,0,0);
	  LOG_D(OPT,"[eNB %d][DLSCH] Frame %d  rnti %x  with size %d\n",
		module_idP, frameP, UE_RNTI(module_idP,UE_id), TBS);
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#endif
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	  aggregation = process_ue_cqi(module_idP,UE_id);
	  nCCE[CC_id]-=(1<<aggregation); // adjust the remaining nCCE
	  nCCE_used[CC_id]+=(1<<aggregation); // adjust the remaining nCCE
	  UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid] = nb_rb;
	  
	  add_ue_dlsch_info(module_idP,
			    CC_id,
			    UE_id,
			    subframeP,
			    S_DL_SCHEDULED);
	  // store stats
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	  eNB->eNB_stats[CC_id].dlsch_bytes_tx+=sdu_length_total;
	  eNB->eNB_stats[CC_id].dlsch_pdus_tx+=1;
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	  UE_list->eNB_UE_stats[CC_id][UE_id].rbs_used = nb_rb;
	  UE_list->eNB_UE_stats[CC_id][UE_id].total_rbs_used += nb_rb;
	  UE_list->eNB_UE_stats[CC_id][UE_id].ncce_used = nCCE[CC_id];
	  UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs1=eNB_UE_stats->dlsch_mcs1;
	  UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs2=mcs;
	  UE_list->eNB_UE_stats[CC_id][UE_id].TBS = TBS;
	  
	  UE_list->eNB_UE_stats[CC_id][UE_id].overhead_bytes= TBS- sdu_length_total;
	  UE_list->eNB_UE_stats[CC_id][UE_id].total_sdu_bytes+= sdu_length_total;
	  UE_list->eNB_UE_stats[CC_id][UE_id].total_pdu_bytes+= TBS;
	  UE_list->eNB_UE_stats[CC_id][UE_id].total_num_pdus+=1;
	  
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	  if (frame_parms[CC_id]->frame_type == TDD) {
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	    UE_list->UE_template[CC_id][UE_id].DAI++;
	    //	printf("DAI update: subframeP %d: UE %d, DAI %d\n",subframeP,UE_id,UE_list->UE_template[CC_id][UE_id].DAI);
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#warning only for 5MHz channel 
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	    update_ul_dci(module_idP,CC_id,rnti,UE_list->UE_template[CC_id][UE_id].DAI);
	  }
	  
	  switch (mac_xface->get_transmission_mode(module_idP,CC_id,rnti)) {
	  case 1:
	  case 2:
	  default:
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	    if (frame_parms[CC_id]->frame_type == TDD) {
	      switch (frame_parms[CC_id]->N_RB_DL) {
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	      case 6:
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->rv = 0;
		((DCI1_1_5MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		break;
	      case 25:
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->rv = 0;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		LOG_D(MAC,"Format1 DCI: harq_pid %d, ndi %d\n",harq_pid,((DCI1_5MHz_TDD_t*)DLSCH_dci)->ndi);
		break;
	      case 50:
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->rv = 0;
		((DCI1_10MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		break;
	      case 100:
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->rv = 0;
		((DCI1_20MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		break;
	      default:
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->rv = 0;
		((DCI1_5MHz_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		break;
	      }
	    }
	    else {
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	      switch (frame_parms[CC_id]->N_RB_DL) {
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	      case 6:
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_1_5MHz_FDD_t*)DLSCH_dci)->rv = 0;
		break;
	      case 25:
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->rv = 0;
		break;
	      case 50:
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_10MHz_FDD_t*)DLSCH_dci)->rv = 0;
		break;
	      case 100:
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_20MHz_FDD_t*)DLSCH_dci)->rv = 0;
		break;
	      default:
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->mcs = mcs;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->ndi = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI1_5MHz_FDD_t*)DLSCH_dci)->rv = 0;
		break;
	      }
	    }
	    break;
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	  case 3:
	    if (frame_parms[CC_id]->frame_type == TDD) {
	      switch (frame_parms[CC_id]->N_RB_DL) {
	      case 6:
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->mcs1 = mcs;
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->ndi1 = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->rv1 = 0;

		// deactivate TB2
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->mcs2 = 0;
		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->rv2 = 1;

		((DCI2A_1_5MHz_2A_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
		break;
	      case 25:
		((DCI2A_5MHz_2A_TDD_t*)DLSCH_dci)->mcs1 = mcs;
		((DCI2A_5MHz_2A_TDD_t*)DLSCH_dci)->harq_pid = harq_pid;
		((DCI2A_5MHz_2A_TDD_t*)DLSCH_dci)->ndi1 = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
		((DCI2A_5MHz_2A_TDD_t*)DLSCH_dci)->rv1 = 0;
		((DCI2A_5MHz_2A_TDD_t*)DLSCH_dci)->dai      = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;

		// deactivate TB2