eNB_scheduler_dlsch.c 107 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
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//#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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{
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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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{
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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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  }
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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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}

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//------------------------------------------------------------------------------
unsigned char
generate_dlsch_header(
                      unsigned char* mac_header,
                      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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{
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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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  }
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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++;
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    } else {
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      first_element=1;
    }
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    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++;
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    } else {
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      first_element=1;
    }
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    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;
      /*
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      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);
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      */
      mac_header_ptr++;
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    } else {
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      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);

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  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);
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    } else {
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      first_element=1;
    }
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    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;
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    } else {
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      ((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",
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            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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  }
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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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  }
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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]
)
//------------------------------------------------------------------------------
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{

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  eNB_MAC_INST         *eNB      = &eNB_mac_inst[module_idP];
  UE_list_t            *UE_list  = &eNB->UE_list;
  unsigned char         DAI;
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  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
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    switch (frame_parms[CC_idP]->tdd_config) {
    case 0:
      //      if ((subframeP==0)||(subframeP==1)||(subframeP==5)||(subframeP==6))
      break;
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    case 1:
      switch (subframeP) {
      case 1:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[7] = DAI;
        break;

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      case 4:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[8] = DAI;
        break;

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      case 6:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
        break;

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      case 9:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[3] = DAI;
        break;
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      }
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    case 2:
      //      if ((subframeP==3)||(subframeP==8))
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      //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
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      break;
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    case 3:
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      //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;
      //}
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      switch (subframeP) {
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      case 5:
      case 6:
      case 1:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
        break;

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      case 7:
      case 8:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[3] = DAI;
        break;

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      case 9:
      case 0:
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        UE_list->UE_template[CC_idP][UE_idP].DAI_ul[4] = DAI;
        break;

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      default:
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        break;
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      }
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      break;
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    case 4:
      //      if ((subframeP==8)||(subframeP==9))
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      //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
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      break;
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    case 5:
      //      if (subframeP==8)
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      //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
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      break;
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    case 6:
      //      if ((subframeP==1)||(subframeP==4)||(subframeP==6)||(subframeP==9))
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      //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul = DAI;
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      break;
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    default:
      break;
    }
  }
}

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//------------------------------------------------------------------------------
void
schedule_ue_spec(
                module_id_t   module_idP,
                frame_t       frameP,
                sub_frame_t   subframeP,
                unsigned int  *nb_rb_used0,
                unsigned int  *nCCE_used,
                int*           mbsfn_flag
)
//------------------------------------------------------------------------------
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{
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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;
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  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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  }
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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);
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    frame_parms[CC_id] = mac_xface->get_lte_frame_parms(module_idP,CC_id);
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    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;

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    // store the global enb stats:
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    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,
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                                frameP,
                                subframeP,
                                dl_pow_off,
                                pre_nb_available_rbs,
                                N_RBG,
                                rballoc_sub_UE,
                                mbsfn_flag);
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  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;
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    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==NOT_A_RNTI) {
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        LOG_D(MAC,"Cannot find rnti for UE_id %d (num_UEs %d)\n",UE_id,UE_list->num_UEs);
        // mac_xface->macphy_exit("Cannot find rnti for UE_id");
        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");
        //  mac_xface->macphy_exit("[MAC][eNB] Cannot find eNB_UE_stats\n");
        continue_flag=1;
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      }
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      if ((pre_nb_available_rbs[CC_id][UE_id] == 0) || (nCCE[CC_id] < (1<<aggregation))) {
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        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);
        //if(mac_xface->get_transmission_mode(module_idP,rnti)==5)
        continue_flag=1; //to next user (there might be rbs availiable for other UEs in TM5
        // else
        //  break;
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      }
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      if (frame_parms[CC_id]->frame_type == TDD)  {
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        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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      }

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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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      }
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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;
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      UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status=mac_eNB_get_rrc_status(module_idP,rnti);
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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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      /*
      DevCheck(((eNB_UE_stats->DL_cqi[0] < MIN_CQI_VALUE) || (eNB_UE_stats->DL_cqi[0] > MAX_CQI_VALUE)),
      eNB_UE_stats->DL_cqi[0], MIN_CQI_VALUE, MAX_CQI_VALUE);
      */
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      eNB_UE_stats->dlsch_mcs1 = cqi_to_mcs[eNB_UE_stats->DL_cqi[0]];
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      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) {
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        eNB_UE_stats->dlsch_mcs1 = cmin(eNB_UE_stats->dlsch_mcs1,16);
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      }
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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
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      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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      }

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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,
            nCCE[CC_id],
            UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status);


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      // 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) {
          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);
          LOG_D(MAC,"DAI update: subframeP %d: UE %d, DAI %d\n",
                subframeP,UE_id,UE_list->UE_template[CC_id][UE_id].DAI);
        }

        // 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
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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];
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            }
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          } 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)||
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                     (frame_parms[CC_id]->N_RB_DL == 50))) {
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                  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id]+1;
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                } else {
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                  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id];
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                }
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              }

              j = j+1;
            }
          }

          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];
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          }
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          switch (mac_xface->get_transmission_mode(module_idP,CC_id,rnti)) {
          case 1:
          case 2:
          default:
            switch (frame_parms[CC_id]->N_RB_DL) {
            case 6:
              if (frame_parms[CC_id]->frame_type == TDD) {
                //        ((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;
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                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);
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              } 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:
              if (frame_parms[CC_id]->frame_type == TDD) {
                //        ((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;
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                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);
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              } 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:
              if (frame_parms[CC_id]->frame_type == TDD) {
                //        ((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;
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                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);
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              } 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:
              if (frame_parms[CC_id]->frame_type == TDD) {
                //        ((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;
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                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);
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              } 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;

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            if(dl_pow_off[CC_id][UE_id] == 2) {
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              dl_pow_off[CC_id][UE_id] = 1;
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            }
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            ((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;
        } 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);
        }
      } else { /* This is a potentially new SDU opportunity */

        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

        //#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) {
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        case 6:
          update_TA = 1;
          break;
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        case 25:
          update_TA = 4;
          break;
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        case 50:
          update_TA = 8;
          break;
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        case 100:
          update_TA = 16;
          break;
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        }

        ta_len = ((eNB_UE_stats->timing_advance_update/update_TA)!=0) ? 2 : 0;
        /*#else
        ta_len = 0;
        #endif*/

        header_len_dcch = 2; // 2 bytes DCCH SDU subheader

        if ( TBS-ta_len-header_len_dcch > 0 ) {
          rlc_status = mac_rlc_status_ind(
                         module_idP,
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                         rnti,
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                         frameP,
                         ENB_FLAG_YES,
                         MBMS_FLAG_NO,
                         DCCH,
                         (TBS-ta_len-header_len_dcch)); // transport block set size

          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,
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                                rnti,
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                                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]);

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            for (j=0; j<sdu_lengths[0]; j++) {
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              LOG_T(MAC,"%x ",dlsch_buffer[j]);
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            }
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            LOG_T(MAC,"\n");
#endif
          } else {
            header_len_dcch = 0;
            sdu_length_total = 0;
          }
        }

        // check for DCCH1 and update header information (assume 2 byte sub-header)
        if (TBS-ta_len-header_len_dcch-sdu_length_total > 0 ) {
          rlc_status = mac_rlc_status_ind(
                         module_idP,
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                         rnti,
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                         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,
888
                                       rnti,
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
                                       frameP,
                                       ENB_FLAG_YES,
                                       MBMS_FLAG_NO,
                                       DCCH+1,
                                       (char *)&dlsch_buffer[sdu_lengths[0]]);

            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]);
          }
        }

        // check for DTCH and update header information
        // here we should loop over all possible DTCH

        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);

        if (TBS-ta_len-header_len_dcch-sdu_length_total-header_len_dtch > 0 ) {
          rlc_status = mac_rlc_status_ind(
                         module_idP,
917
                         rnti,
918 919 920 921 922 923 924 925 926 927 928 929
                         frameP,
                         ENB_FLAG_YES,
                         MBMS_FLAG_NO,
                         DTCH,
                         TBS-ta_len-header_len_dcch-sdu_length_total-header_len_dtch);

          if (rlc_status.bytes_in_buffer > 0) {

            LOG_D(MAC,"[eNB %d][USER-PLANE DEFAULT DRB], Frame %d, DTCH->DLSCH, Requesting %d bytes from RLC (hdr len dtch %d)\n",
                  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,
930
                                      rnti,
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
                                      frameP,
                                      ENB_FLAG_YES,
                                      MBMS_FLAG_NO,
                                      DTCH,
                                      (char*)&dlsch_buffer[sdu_length_total]);

            LOG_D(MAC,"[eNB %d][USER-PLANE DEFAULT DRB] Got %d bytes for DTCH %d \n",module_idP,sdu_lengths[num_sdus],DTCH);
            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;
          }
        }

        // 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;

971 972 973 974 975
          if (mcs==0) {
            nb_rb = 4;  // don't let the TBS get too small
          } else {
            nb_rb=min_rb_unit[CC_id];
          }
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005

          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]) {
            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)||
1006
                     (frame_parms[CC_id]->N_RB_DL == 50))) {
1007
                  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id]+1;
1008
                } else {
1009
                  nb_rb_temp = nb_rb_temp - min_rb_unit[CC_id];
1010
                }
1011 1012 1013 1014 1015 1016 1017 1018 1019
              }

              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]->