eNB_scheduler_mch.c 27.2 KB
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/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2010 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fsr/openairinterface
  Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

 *******************************************************************************/
/*! \file eNB_scheduler_mch.c
 * \brief procedures related to UE on the MCH transport channel
 * \author  Navid Nikaein and Raymond Knopp
 * \date 2012 - 2014
 * \email: navid.nikaein@eurecom.fr
 * \version 0.5
 * @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 "ARCH/CBMIMO1/DEVICE_DRIVER/extern.h"
#include "ARCH/CBMIMO1/DEVICE_DRIVER/defs.h"
#include "ARCH/CBMIMO1/DEVICE_DRIVER/from_grlib_softregs.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


#ifdef Rel10
int8_t get_mbsfn_sf_alloction (module_id_t module_idP, uint8_t mbsfn_sync_area){
  // currently there is one-to-one mapping between sf allocation pattern and sync area
  if (mbsfn_sync_area > MAX_MBSFN_AREA){
      LOG_W(MAC,"[eNB %d] MBSFN synchronization area %d out of range\n ", module_idP, mbsfn_sync_area);
      return -1;
  }
  else if (eNB_mac_inst[module_idP].mbsfn_SubframeConfig[mbsfn_sync_area] != NULL)
    return mbsfn_sync_area;
  else {
      LOG_W(MAC,"[eNB %d] MBSFN Subframe Config pattern %d not found \n ", module_idP, mbsfn_sync_area);
      return -1;
  }
}

int schedule_MBMS(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP) {

  int mcch_flag=0,mtch_flag=0, msi_flag=0;
  int mbsfn_period =0;// 1<<(eNB_mac_inst[module_idP].mbsfn_SubframeConfig[0]->radioframeAllocationPeriod);
  int mcch_period = 0;//32<<(eNB_mac_inst[module_idP].mbsfn_AreaInfo[0]->mcch_Config_r9.mcch_RepetitionPeriod_r9);
  int mch_scheduling_period = 8<<(eNB_mac_inst[module_idP].pmch_Config[0]->mch_SchedulingPeriod_r9);
  unsigned char mcch_sdu_length;
  unsigned char header_len_mcch=0,header_len_msi=0,header_len_mtch=0, header_len_mtch_temp=0, header_len_mcch_temp=0, header_len_msi_temp=0;
  int ii=0, msi_pos=0;
  int mcch_mcs = -1;
  uint16_t TBS,j,padding=0,post_padding=0;
  mac_rlc_status_resp_t rlc_status;
  int num_mtch;
  int msi_length,i,k;
  unsigned char sdu_lcids[11], num_sdus=0, offset=0;
  uint16_t sdu_lengths[11], sdu_length_total=0;
  unsigned char mch_buffer[MAX_DLSCH_PAYLOAD_BYTES]; // check the max value, this is for dlsch only

  eNB_mac_inst[module_idP].MCH_pdu.Pdu_size=0;

  for (i=0;
      i< eNB_mac_inst[module_idP].num_active_mbsfn_area;
      i++ ){
      // assume, that there is always a mapping
      if ((j=get_mbsfn_sf_alloction(module_idP,i)) == -1)
        return 0;

      mbsfn_period = 1<<(eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationPeriod);
      mcch_period = 32<<(eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_RepetitionPeriod_r9);
      msi_pos=0; ii=0;
      LOG_D(MAC,"[eNB %d] Frame %d subframeP %d : Checking MBSFN Sync Area %d/%d with SF allocation %d/%d for MCCH and MTCH (mbsfn period %d, mcch period %d)\n",
          module_idP,frameP, subframeP,i,eNB_mac_inst[module_idP].num_active_mbsfn_area,
          j,eNB_mac_inst[module_idP].num_sf_allocation_pattern,mbsfn_period,mcch_period);


      switch (eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.signallingMCS_r9) {
      case 0:
        mcch_mcs = 2;
        break;
      case 1:
        mcch_mcs = 7;
        break;
      case 2:
        mcch_mcs = 13;
        break;
      case 3:
        mcch_mcs = 19;
        break;
      }

      // 1st: Check the MBSFN subframes from SIB2 info (SF allocation pattern i, max 8 non-overlapping patterns exist)
      if (frameP %  mbsfn_period == eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationOffset){ // MBSFN frameP
          if (eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.present == MBSFN_SubframeConfig__subframeAllocation_PR_oneFrame){// one-frameP format

              //  Find the first subframeP in this MCH to transmit MSI
              if (frameP % mch_scheduling_period == eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationOffset ) {
                  while (ii == 0) {
                      ii = eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & (0x80>>msi_pos);
                      msi_pos++;
                  }
                  LOG_D(MAC,"[eNB %d] Frame %d subframeP %d : sync area %d sf allocation pattern %d sf alloc %x msi pos is %d \n", module_idP,frameP, subframeP,i,j,eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0], msi_pos);
              }

              // Check if the subframeP is for MSI, MCCH or MTCHs and Set the correspoding flag to 1
              switch (subframeP) {
              case 1:
                if (mac_xface->lte_frame_parms->frame_type == FDD) {
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF1) == MBSFN_FDD_SF1) {
                        if (msi_pos == 1)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF1) == MBSFN_FDD_SF1) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 2:
                if (mac_xface->lte_frame_parms->frame_type == FDD){
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF2) == MBSFN_FDD_SF2) {
                        if (msi_pos == 2)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF2) == MBSFN_FDD_SF2) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 3:
                if (mac_xface->lte_frame_parms->frame_type == TDD){// TDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_TDD_SF3) == MBSFN_TDD_SF3) {
                        if (msi_pos == 1)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_TDD_SF3) == MBSFN_TDD_SF3) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                else {// FDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF3) == MBSFN_FDD_SF3) {
                        if (msi_pos == 3)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF3) == MBSFN_FDD_SF3) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 4:
                if (mac_xface->lte_frame_parms->frame_type == TDD){
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_TDD_SF4) == MBSFN_TDD_SF4) {
                        if (msi_pos == 2)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_TDD_SF4) == MBSFN_TDD_SF4) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 6:
                if (mac_xface->lte_frame_parms->frame_type == FDD){
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF6) == MBSFN_FDD_SF6) {
                        if (msi_pos == 4)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF6) == MBSFN_FDD_SF6) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 7:
                if (mac_xface->lte_frame_parms->frame_type == TDD){ // TDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_TDD_SF7) == MBSFN_TDD_SF7) {
                        if (msi_pos == 3)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_TDD_SF7) == MBSFN_TDD_SF7) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                else {// FDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF7) == MBSFN_FDD_SF7) {
                        if (msi_pos == 5)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF7) == MBSFN_FDD_SF7) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 8:
                if (mac_xface->lte_frame_parms->frame_type == TDD){ //TDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_TDD_SF8) == MBSFN_TDD_SF8) {
                        if (msi_pos == 4)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_TDD_SF8) == MBSFN_TDD_SF8) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                else{ // FDD
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_FDD_SF8) == MBSFN_FDD_SF8) {
                        if (msi_pos == 6)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_FDD_SF8) == MBSFN_FDD_SF8) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;

              case 9:
                if (mac_xface->lte_frame_parms->frame_type == TDD){
                    if ((eNB_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & MBSFN_TDD_SF9) == MBSFN_TDD_SF9) {
                        if (msi_pos == 5)
                          msi_flag = 1;
                        if ( (frameP % mcch_period == eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
                            ((eNB_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.sf_AllocInfo_r9.buf[0] & MBSFN_TDD_SF9) == MBSFN_TDD_SF9) )
                          mcch_flag = 1;
                        mtch_flag = 1;
                    }
                }
                break;
              }// end switch
              // sf allocation is non-overlapping
              if ((msi_flag==1) || (mcch_flag==1) || (mtch_flag==1)){
                  LOG_D(MAC,"[eNB %d] Frame %d Subframe %d: sync area %d SF alloc %d: msi flag %d, mcch flag %d, mtch flag %d\n",
                      module_idP, frameP, subframeP,i,j,msi_flag,mcch_flag,mtch_flag);
                  break;
              }
          }
          else {// four-frameP format
          }
      }
  } // end of for loop
  eNB_mac_inst[module_idP].msi_active=0;
  eNB_mac_inst[module_idP].mcch_active=0;
  eNB_mac_inst[module_idP].mtch_active=0;
  // Calculate the mcs
  if ((msi_flag==1) || (mcch_flag==1)) {
      eNB_mac_inst[module_idP].MCH_pdu.mcs = mcch_mcs;
  }
  else if (mtch_flag == 1) { // only MTCH in this subframeP
      eNB_mac_inst[module_idP].MCH_pdu.mcs = eNB_mac_inst[module_idP].pmch_Config[0]->dataMCS_r9;
  }


  // 2nd: Create MSI, get MCCH from RRC and MTCHs from RLC

  // there is MSI (MCH Scheduling Info)
  if (msi_flag == 1) {
      // Create MSI here
      uint16_t msi_control_element[29], *msi_ptr;

      msi_ptr = &msi_control_element[0];
      ((MSI_ELEMENT *) msi_ptr)->lcid = MCCH_LCHANID; //MCCH
      if (mcch_flag==1) {
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_MSB = 0;
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_LSB = 0;
      }
      else {                    // no mcch for this MSP
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_MSB = 0x7;// stop value is 2047
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_LSB = 0xff;
      }
      msi_ptr+= sizeof(MSI_ELEMENT);

      //Header for MTCHs
      num_mtch = eNB_mac_inst[module_idP].mbms_SessionList[0]->list.count;
      for (k=0;k<num_mtch;k++) { // loop for all session in this MCH (MCH[0]) at this moment
          ((MSI_ELEMENT *) msi_ptr)->lcid = eNB_mac_inst[module_idP].mbms_SessionList[0]->list.array[k]->logicalChannelIdentity_r9;//mtch_lcid;
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_MSB = 0; // last subframeP of this mtch (only one mtch now)
          ((MSI_ELEMENT *) msi_ptr)->stop_sf_LSB = 0xB;
          msi_ptr+=sizeof(MSI_ELEMENT);
      }
      msi_length = msi_ptr-msi_control_element;
      if (msi_length<128)
        header_len_msi = 2;
      else
        header_len_msi = 3;

      LOG_D(MAC,"[eNB %d] Frame %d : MSI->MCH, length of MSI is %d bytes \n",module_idP,frameP,msi_length);
      //LOG_D(MAC,"Scheduler: MSI is transmitted in this subframeP \n" );

      //   LOG_D(MAC,"Scheduler: MSI length is %d bytes\n",msi_length);
      // Store MSI data to mch_buffer[0]
      memcpy((char *)&mch_buffer[sdu_length_total],
          msi_control_element,
          msi_length);

      sdu_lcids[num_sdus] = MCH_SCHDL_INFO;
      sdu_lengths[num_sdus] = msi_length;
      sdu_length_total += sdu_lengths[num_sdus];
      LOG_I(MAC,"[eNB %d] Create %d bytes for MSI\n",module_idP,sdu_lengths[num_sdus]);
      num_sdus++;
      eNB_mac_inst[module_idP].msi_active=1;
  }

  // there is MCCH
  if (mcch_flag == 1) {
      LOG_D(MAC,"[eNB %d] Frame %d Subframe %d: Schedule MCCH MESSAGE (area %d, sfAlloc %d)\n",
          module_idP,frameP, subframeP, i, j);

      mcch_sdu_length = mac_rrc_data_req(module_idP,
          frameP,
          MCCH,1,
          &eNB_mac_inst[module_idP].MCCH_pdu.payload[0],
          1,// this is eNB
          module_idP, // index
          i); // this is the mbsfn sync area index

      if (mcch_sdu_length > 0) {
          LOG_D(MAC,"[eNB %d] Frame %d subframeP %d : MCCH->MCH, Received %d bytes from RRC \n",module_idP,frameP,subframeP,mcch_sdu_length);

          header_len_mcch = 2;
          if (mac_xface->lte_frame_parms->frame_type == TDD) {
              LOG_D(MAC,"[eNB %d] Frame %d subframeP %d: Scheduling MCCH->MCH (TDD) for MCCH message %d bytes (mcs %d )\n",
                  module_idP,
                  frameP,subframeP,
                  mcch_sdu_length,
                  mcch_mcs);
          }
          else {
              LOG_I(MAC,"[eNB %d] Frame %d subframeP %d: Scheduling MCCH->MCH (FDD) for MCCH message %d bytes (mcs %d)\n",
                  module_idP,
                  frameP, subframeP,
                  mcch_sdu_length,
                  mcch_mcs);
          }
          eNB_mac_inst[module_idP].mcch_active=1;

          memcpy((char *)&mch_buffer[sdu_length_total],
              &eNB_mac_inst[module_idP].MCCH_pdu.payload[0],
              mcch_sdu_length);
          sdu_lcids[num_sdus] = MCCH_LCHANID;
          sdu_lengths[num_sdus] = mcch_sdu_length;
          if (sdu_lengths[num_sdus]>128)
            header_len_mcch = 3;
          sdu_length_total += sdu_lengths[num_sdus];
          LOG_D(MAC,"[eNB %d] Got %d bytes for MCCH from RRC \n",module_idP,sdu_lengths[num_sdus]);
          num_sdus++;
      }
  }
  TBS = mac_xface->get_TBS_DL(eNB_mac_inst[module_idP].MCH_pdu.mcs, mac_xface->lte_frame_parms->N_RB_DL);
#ifdef Rel10
  // do not let mcch and mtch multiplexing when relaying is active
  // for sync area 1, so not transmit data
  //if ((i == 0) && ((eNB_mac_inst[module_idP].MBMS_flag != multicast_relay) || (eNB_mac_inst[module_idP].mcch_active==0))) {
#endif
  // there is MTCHs, loop if there are more than 1
  if (mtch_flag == 1) {
      // Calculate TBS
      /* if ((msi_flag==1) || (mcch_flag==1)) {
       TBS = mac_xface->get_TBS(mcch_mcs, mac_xface->lte_frame_parms->N_RB_DL);
       }
       else { // only MTCH in this subframeP
       TBS = mac_xface->get_TBS(eNB_mac_inst[module_idP].pmch_Config[0]->dataMCS_r9, mac_xface->lte_frame_parms->N_RB_DL);
       }

    // get MTCH data from RLC (like for DTCH)
    LOG_D(MAC,"[eNB %d] Frame %d subframe %d: Schedule MTCH (area %d, sfAlloc %d)\n",Mod_id,frame,subframe,i,j);

    header_len_mtch = 3;
	  LOG_D(MAC,"[eNB %d], Frame %d, MTCH->MCH, Checking RLC status (rab %d, tbs %d, len %d)\n",
	  Mod_id,frame,MTCH,TBS,
	  TBS-header_len_mcch-header_len_msi-sdu_length_total-header_len_mtch);

    rlc_status = mac_rlc_status_ind(Mod_id,frame,1,RLC_MBMS_YES,MTCH+ (maxDRB + 3) * MAX_MOBILES_PER_RG,
				    TBS-header_len_mcch-header_len_msi-sdu_length_total-header_len_mtch);
    printf("frame %d, subframe %d,  rlc_status.bytes_in_buffer is %d\n",frame,subframe, rlc_status.bytes_in_buffer);

       */

      // get MTCH data from RLC (like for DTCH)
      LOG_D(MAC,"[eNB %d] Frame %d subframeP %d: Schedule MTCH (area %d, sfAlloc %d)\n",module_idP,frameP,subframeP,i,j);

      header_len_mtch = 3;
      LOG_D(MAC,"[eNB %d], Frame %d, MTCH->MCH, Checking RLC status (rab %d, tbs %d, len %d)\n",
          module_idP,frameP,MTCH,TBS,
          TBS-header_len_mcch-header_len_msi-sdu_length_total-header_len_mtch);

      rlc_status = mac_rlc_status_ind(module_idP,0,frameP,ENB_FLAG_YES,MBMS_FLAG_YES,MTCH,
          TBS-header_len_mcch-header_len_msi-sdu_length_total-header_len_mtch);
      LOG_D(MAC,"e-MBMS log channel %u frameP %d, subframeP %d,  rlc_status.bytes_in_buffer is %d\n",
            MTCH,frameP,subframeP, rlc_status.bytes_in_buffer);

      if (rlc_status.bytes_in_buffer >0) {
          LOG_I(MAC,"[eNB %d][MBMS USER-PLANE], Frame %d, MTCH->MCH, Requesting %d bytes from RLC (header len mtch %d)\n",
              module_idP,frameP,TBS-header_len_mcch-header_len_msi-sdu_length_total-header_len_mtch,header_len_mtch);

          sdu_lengths[num_sdus] = mac_rlc_data_req(
              module_idP,
              0,
              frameP,
              ENB_FLAG_YES,
              MBMS_FLAG_YES,
              MTCH,
              (char*)&mch_buffer[sdu_length_total]);
          //sdu_lengths[num_sdus] = mac_rlc_data_req(module_idP,frameP, MBMS_FLAG_NO,  MTCH+(MAX_NUM_RB*(NUMBER_OF_UE_MAX+1)), (char*)&mch_buffer[sdu_length_total]);
          LOG_I(MAC,"[eNB %d][MBMS USER-PLANE] Got %d bytes for MTCH %d\n",module_idP,sdu_lengths[num_sdus],MTCH);
          eNB_mac_inst[module_idP].mtch_active=1;
          sdu_lcids[num_sdus] = MTCH;
          sdu_length_total += sdu_lengths[num_sdus];
          if (sdu_lengths[num_sdus] < 128)
            header_len_mtch = 2;
          num_sdus++;
      }
      else {
          header_len_mtch = 0;
      }
  }
#ifdef Rel10
  //  }
#endif
  // FINAL STEP: Prepare and multiplexe MSI, MCCH and MTCHs
  if ((sdu_length_total + header_len_msi + header_len_mcch + header_len_mtch) >0) {
      // Adjust the last subheader
      /*                                 if ((msi_flag==1) || (mcch_flag==1)) {
                                         eNB_mac_inst[module_idP].MCH_pdu.mcs = mcch_mcs;
                                          }
                                        else if (mtch_flag == 1) { // only MTCH in this subframeP
                                       eNB_mac_inst[module_idP].MCH_pdu.mcs = eNB_mac_inst[module_idP].pmch_Config[0]->dataMCS_r9;
                                          }
       */
      header_len_mtch_temp = header_len_mtch;
      header_len_mcch_temp = header_len_mcch;
      header_len_msi_temp = header_len_msi;
      if (header_len_mtch>0)
        header_len_mtch=1;         // remove Length field in the  subheader for the last PDU
      else if (header_len_mcch>0)
        header_len_mcch=1;
      else header_len_msi=1;
      // Calculate the padding
      if ((TBS - header_len_mtch - header_len_mcch - header_len_msi - sdu_length_total) < 0) {
	LOG_E(MAC,"Error in building MAC PDU, TBS %d < PDU %d \n", 
	      TBS, header_len_mtch + header_len_mcch + header_len_msi + sdu_length_total);
	return;
      }else if ((TBS - header_len_mtch - header_len_mcch - header_len_msi - sdu_length_total) <= 2) {
          padding = (TBS - header_len_mtch - header_len_mcch - header_len_msi - sdu_length_total);
          post_padding = 0;
      }
      else {// using post_padding, give back the Length field of subheader  for the last PDU
          padding = 0;
          if (header_len_mtch>0)
            header_len_mtch = header_len_mtch_temp;
          else if (header_len_mcch>0)
            header_len_mcch = header_len_mcch_temp;
          else header_len_msi = header_len_msi_temp;
          post_padding = TBS - sdu_length_total - header_len_msi - header_len_mcch - header_len_mtch;
      }
      // Generate the MAC Header for MCH
      // here we use the function for DLSCH because DLSCH & MCH have the same Header structure
      offset = generate_dlsch_header((unsigned char*)eNB_mac_inst[module_idP].MCH_pdu.payload,
          num_sdus,
          sdu_lengths,
          sdu_lcids,
          255,    // no drx
          0,  // no timing advance
          NULL,  // no contention res id
          padding,
          post_padding);

      eNB_mac_inst[module_idP].MCH_pdu.Pdu_size=TBS;
      eNB_mac_inst[module_idP].MCH_pdu.sync_area=i;
      eNB_mac_inst[module_idP].MCH_pdu.msi_active= eNB_mac_inst[module_idP].msi_active;
      eNB_mac_inst[module_idP].MCH_pdu.mcch_active= eNB_mac_inst[module_idP].mcch_active;
      eNB_mac_inst[module_idP].MCH_pdu.mtch_active= eNB_mac_inst[module_idP].mtch_active;
      LOG_D(MAC," MCS for this sf is %d (mcch active %d, mtch active %d)\n", eNB_mac_inst[module_idP].MCH_pdu.mcs,
          eNB_mac_inst[module_idP].MCH_pdu.mcch_active,eNB_mac_inst[module_idP].MCH_pdu.mtch_active );
      LOG_I(MAC,"[eNB %d][MBMS USER-PLANE ] Generate header : sdu_length_total %d, num_sdus %d, sdu_lengths[0] %d, sdu_lcids[0] %d => payload offset %d,padding %d,post_padding %d (mcs %d, TBS %d), header MTCH %d, header MCCH %d, header MSI %d\n",
          module_idP,sdu_length_total,num_sdus,sdu_lengths[0],sdu_lcids[0],offset,padding,post_padding,eNB_mac_inst[module_idP].MCH_pdu.mcs,TBS,header_len_mtch, header_len_mcch, header_len_msi);
      // copy SDU to mch_pdu after the MAC Header
      memcpy(&eNB_mac_inst[module_idP].MCH_pdu.payload[offset],mch_buffer,sdu_length_total);
      // filling remainder of MCH with random data if necessery
      for (j=0;j<(TBS-sdu_length_total-offset);j++)
        eNB_mac_inst[module_idP].MCH_pdu.payload[offset+sdu_length_total+j] = (char)(taus()&0xff);

#if defined(USER_MODE) && defined(OAI_EMU)
      /* Tracing of PDU is done on UE side */
      if (oai_emulation.info.opt_enabled)
        trace_pdu(1, (uint8_t *)eNB_mac_inst[module_idP].MCH_pdu.payload,
            TBS, module_idP, 6, 0xffff,  // M_RNTI = 6 in wirehsark
            eNB_mac_inst[module_idP].subframe,0,0);
      LOG_D(OPT,"[eNB %d][MCH] Frame %d : MAC PDU with size %d\n",
          module_idP, frameP, TBS);
#endif
      /*
   for (j=0;j<sdu_length_total;j++)
      printf("%2x.",eNB_mac_inst[module_idP].MCH_pdu.payload[j+offset]);
      printf(" \n");*/
      return 1;
  }
  else {
      eNB_mac_inst[module_idP].MCH_pdu.Pdu_size=0;
      eNB_mac_inst[module_idP].MCH_pdu.sync_area=0;
      eNB_mac_inst[module_idP].MCH_pdu.msi_active=0;
      eNB_mac_inst[module_idP].MCH_pdu.mcch_active=0;
      eNB_mac_inst[module_idP].MCH_pdu.mtch_active=0;
      // for testing purpose, fill with random data
      //for (j=0;j<(TBS-sdu_length_total-offset);j++)
      //  eNB_mac_inst[module_idP].MCH_pdu.payload[offset+sdu_length_total+j] = (char)(taus()&0xff);
      return 0;
  }
  //this is for testing
  /*
  if (mtch_flag == 1) {
  //  LOG_D(MAC,"DUY: mch_buffer length so far is : %ld\n", &mch_buffer[sdu_length_total]-&mch_buffer[0]);
  return 1;
  }
  else
  return 0;
   */
}
MCH_PDU *get_mch_sdu(uint8_t module_idP,uint32_t frameP, sub_frame_t subframeP) {
  //  eNB_mac_inst[module_idP].MCH_pdu.mcs=0;
  //LOG_D(MAC," MCH_pdu.mcs is %d\n", eNB_mac_inst[module_idP].MCH_pdu.mcs);
  return(&eNB_mac_inst[module_idP].MCH_pdu);
}

#endif