ue_procedures.c 74.1 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
    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

  Address      : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.

*******************************************************************************/
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/*! \file ue_procedures.c
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 * \brief procedures related to UE
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 * \author  Navid Nikaein and Raymond Knopp
 * \date 2010 - 2014
 * \version 1
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 * \email: navid.nikaein@eurecom.fr
 * @ingroup _mac
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 */
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#ifdef EXMIMO
#include <pthread.h>
#endif

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#include "extern.h"
#include "defs.h"
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#include "proto.h"
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#ifdef PHY_EMUL
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# include "SIMULATION/PHY_EMULATION/impl_defs.h"
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#else
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# include "SCHED/defs.h"
# include "PHY/impl_defs_top.h"
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#endif
#include "PHY_INTERFACE/defs.h"
#include "PHY_INTERFACE/extern.h"
#include "COMMON/mac_rrc_primitives.h"
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#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
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#include "RRC/LITE/extern.h"
#include "UTIL/LOG/log.h"
#include "UTIL/LOG/vcd_signal_dumper.h"
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#include "UTIL/OPT/opt.h"
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#include "OCG.h"
#include "OCG_extern.h"
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#ifdef PHY_EMUL
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# include "SIMULATION/simulation_defs.h"
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#endif
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#include "pdcp.h"
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#if defined(ENABLE_ITTI)
# include "intertask_interface.h"
#endif

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#include "assertions.h"

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#define DEBUG_HEADER_PARSING 1
#define ENABLE_MAC_PAYLOAD_DEBUG

/*
#ifndef USER_MODE
#define msg debug_msg
#endif
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 */
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mapping BSR_names[] = {
    {"NONE", 0},
    {"SHORT BSR", 1},
    {"TRUNCATED BSR", 2},
    {"LONG BSR", 3},
    {"PADDING BSR", 4},
    {NULL, -1}
};

extern inline unsigned int taus(void);


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void ue_init_mac(module_id_t module_idP){
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  int i;
  // default values as deined in 36.331 sec 9.2.2
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  LOG_I(MAC,"[UE%d] Applying default macMainConfig\n",module_idP);
  //UE_mac_inst[module_idP].scheduling_info.macConfig=NULL;
  UE_mac_inst[module_idP].scheduling_info.retxBSR_Timer= MAC_MainConfig__ul_SCH_Config__retxBSR_Timer_sf2560;
  UE_mac_inst[module_idP].scheduling_info.periodicBSR_Timer=MAC_MainConfig__ul_SCH_Config__periodicBSR_Timer_infinity;
  UE_mac_inst[module_idP].scheduling_info.periodicPHR_Timer = MAC_MainConfig__phr_Config__setup__periodicPHR_Timer_sf20;
  UE_mac_inst[module_idP].scheduling_info.prohibitPHR_Timer = MAC_MainConfig__phr_Config__setup__prohibitPHR_Timer_sf20;
  UE_mac_inst[module_idP].scheduling_info.PathlossChange_db = MAC_MainConfig__phr_Config__setup__dl_PathlossChange_dB1;
  UE_mac_inst[module_idP].PHR_state = MAC_MainConfig__phr_Config_PR_setup;
  UE_mac_inst[module_idP].scheduling_info.SR_COUNTER=0;
  UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer=0;
  UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer_Running=0;
  UE_mac_inst[module_idP].scheduling_info.maxHARQ_Tx=MAC_MainConfig__ul_SCH_Config__maxHARQ_Tx_n5;
  UE_mac_inst[module_idP].scheduling_info.ttiBundling=0;
  UE_mac_inst[module_idP].scheduling_info.drx_config=NULL;
  UE_mac_inst[module_idP].scheduling_info.phr_config=NULL;
  UE_mac_inst[module_idP].scheduling_info.periodicBSR_SF  =  get_sf_periodicBSRTimer(UE_mac_inst[module_idP].scheduling_info.periodicBSR_Timer);
  UE_mac_inst[module_idP].scheduling_info.retxBSR_SF     =  get_sf_retxBSRTimer(UE_mac_inst[module_idP].scheduling_info.retxBSR_Timer);
  UE_mac_inst[module_idP].scheduling_info.periodicPHR_SF =  get_sf_perioidicPHR_Timer(UE_mac_inst[module_idP].scheduling_info.periodicPHR_Timer);
  UE_mac_inst[module_idP].scheduling_info.prohibitPHR_SF =  get_sf_prohibitPHR_Timer(UE_mac_inst[module_idP].scheduling_info.prohibitPHR_Timer);
  UE_mac_inst[module_idP].scheduling_info.PathlossChange_db =  get_db_dl_PathlossChange(UE_mac_inst[module_idP].scheduling_info.PathlossChange);
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  for (i=0; i < MAX_NUM_LCID; i++){
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    LOG_D(MAC,"[UE%d] Applying default logical channel config for LCGID %d\n",module_idP,i);
    UE_mac_inst[module_idP].scheduling_info.Bj[i]=-1;
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      UE_mac_inst[module_idP].scheduling_info.bucket_size[i]=-1;
      if (i < DTCH) // initilize all control channels lcgid to 0
        UE_mac_inst[module_idP].scheduling_info.LCGID[i]=0;
      else // initialize all the data channels lcgid to 1
        UE_mac_inst[module_idP].scheduling_info.LCGID[i]=1;
      UE_mac_inst[module_idP].scheduling_info.LCID_status[i]=0;
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  }
}

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unsigned char *parse_header(unsigned char *mac_header,
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			    unsigned char *num_ce,
			    unsigned char *num_sdu,
			    unsigned char *rx_ces,
			    unsigned char *rx_lcids,
			    unsigned short *rx_lengths,
			    unsigned short tb_length) {
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  unsigned char not_done=1,num_ces=0,num_sdus=0,lcid, num_sdu_cnt;
  unsigned char *mac_header_ptr = mac_header;
  unsigned short length,ce_len=0;

  while (not_done==1) {

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      if (((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E == 0) {
          //      printf("E=0\n");
          not_done = 0;
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      }
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      lcid = ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID;
      if (lcid < UE_CONT_RES) {
          //printf("[MAC][UE] header %x.%x.%x\n",mac_header_ptr[0],mac_header_ptr[1],mac_header_ptr[2]);
          if (not_done==0) {// last MAC SDU, length is implicit
              mac_header_ptr++;
              length = tb_length-(mac_header_ptr-mac_header)-ce_len;
              for (num_sdu_cnt=0; num_sdu_cnt < num_sdus ; num_sdu_cnt++)
                length -= rx_lengths[num_sdu_cnt];
          }
          else {
              if (((SCH_SUBHEADER_LONG *)mac_header_ptr)->F == 1) {
                  length = ((((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_MSB & 0x7f ) << 8 ) | (((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_LSB & 0xff);
                  mac_header_ptr += 3;
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#ifdef DEBUG_HEADER_PARSING
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                  LOG_D(MAC,"[UE] parse long sdu, size %x \n",length);
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#endif
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              }  else {	//if (((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F == 0) {
                  length = ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L;
                  mac_header_ptr += 2;
              }
          }
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#ifdef DEBUG_HEADER_PARSING
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          LOG_D(MAC,"[UE] sdu %d lcid %d length %d (offset now %d)\n",
              num_sdus,lcid,length,mac_header_ptr-mac_header);
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#endif
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          rx_lcids[num_sdus] = lcid;
          rx_lengths[num_sdus] = length;
          num_sdus++;
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      }
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      else {  // This is a control element subheader
          if (lcid == SHORT_PADDING) {
              mac_header_ptr++;
          }
          else {
              rx_ces[num_ces] = lcid;
              num_ces++;
              mac_header_ptr ++;
              if (lcid==TIMING_ADV_CMD)
                ce_len++;
              else if (lcid==UE_CONT_RES)
                ce_len+=6;
          }
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#ifdef DEBUG_HEADER_PARSING
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          LOG_D(MAC,"[UE] ce %d lcid %d (offset now %d)\n",num_ces,lcid,mac_header_ptr-mac_header);
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#endif
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      }
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  }
  *num_ce = num_ces;
  *num_sdu = num_sdus;

  return(mac_header_ptr);
}

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uint32_t ue_get_SR(module_id_t module_idP,int CC_id,frame_t frameP,uint8_t eNB_id,uint16_t rnti, sub_frame_t subframe) {
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  // no UL-SCH resources available for this tti && UE has a valid PUCCH resources for SR configuration for this tti
  //  int MGL=6;// measurement gap length in ms
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  int MGRP       = 0; // measurement gap repetition period in ms
  int gapOffset  = -1;
  int T          = 0;
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  DevCheck(module_idP < NB_UE_INST, module_idP, NB_UE_INST, 0);
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  if (CC_id>0) {
    LOG_E(MAC,"Transmission on secondary CCs is not supported yet\n");
    mac_xface->macphy_exit("MAC FATAL  CC_id>0");
    return;
  }

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  // determin the measurement gap
  LOG_D(MAC,"[UE %d][SR %x] Frame %d subframe %d PHY asks for SR (SR_COUNTER/dsr_TransMax %d/%d), SR_pending %d\n",
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      module_idP,rnti,frameP,subframe,
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      UE_mac_inst[module_idP].scheduling_info.SR_COUNTER,
      (1<<(2+UE_mac_inst[module_idP].physicalConfigDedicated->schedulingRequestConfig->choice.setup.dsr_TransMax)),
      UE_mac_inst[module_idP].scheduling_info.SR_pending);

  if (UE_mac_inst[module_idP].measGapConfig !=NULL){
      if (UE_mac_inst[module_idP].measGapConfig->choice.setup.gapOffset.present == MeasGapConfig__setup__gapOffset_PR_gp0){
          MGRP= 40;
          gapOffset= UE_mac_inst[module_idP].measGapConfig->choice.setup.gapOffset.choice.gp0;
      }else if (UE_mac_inst[module_idP].measGapConfig->choice.setup.gapOffset.present == MeasGapConfig__setup__gapOffset_PR_gp1){
          MGRP= 80;
          gapOffset= UE_mac_inst[module_idP].measGapConfig->choice.setup.gapOffset.choice.gp1;
      }else{
          LOG_W(MAC, "Measurement GAP offset is unknown\n");
      }
      T=MGRP/10;
      //check the measurement gap and sr prohibit timer
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      if ((subframe ==  gapOffset %10) && ((frameP %T) == (floor(gapOffset/10)))
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          && (UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer_Running =0)){
          UE_mac_inst[module_idP].scheduling_info.SR_pending=1;
          return(0);
      }
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  }
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  if ((UE_mac_inst[module_idP].scheduling_info.SR_pending==1) &&
      (UE_mac_inst[module_idP].scheduling_info.SR_COUNTER <
          (1<<(2+UE_mac_inst[module_idP].physicalConfigDedicated->schedulingRequestConfig->choice.setup.dsr_TransMax)))
  ){
      UE_mac_inst[module_idP].scheduling_info.SR_COUNTER++;
      // start the sr-prohibittimer : rel 9 and above
      if (UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer > 0) { // timer configured
          UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer--;
          UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer_Running=1;
      } else
        UE_mac_inst[module_idP].scheduling_info.sr_ProhibitTimer_Running=0;
      LOG_D(MAC,"[UE %d][SR %x] Frame %d subframe %d send SR_indication (SR_COUNTER/dsr_TransMax %d/%d), SR_pending %d\n",
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          module_idP,rnti,frameP,subframe,
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          UE_mac_inst[module_idP].scheduling_info.SR_COUNTER,
          (1<<(2+UE_mac_inst[module_idP].physicalConfigDedicated->schedulingRequestConfig->choice.setup.dsr_TransMax)),
          UE_mac_inst[module_idP].scheduling_info.SR_pending);

      //UE_mac_inst[module_idP].ul_active =1;

      return(1); //instruct phy to signal SR
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  }
  else{
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      // notify RRC to relase PUCCH/SRS
      // clear any configured dl/ul
      // initiate RA
      UE_mac_inst[module_idP].scheduling_info.SR_pending=0;
      UE_mac_inst[module_idP].scheduling_info.SR_COUNTER=0;
      return(0);
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  }
}

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void ue_send_sdu(module_id_t module_idP,int CC_id,frame_t frameP,uint8_t *sdu,uint16_t sdu_len,uint8_t eNB_index) {
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  unsigned char rx_ces[MAX_NUM_CE],num_ce,num_sdu,i,*payload_ptr;
  unsigned char rx_lcids[NB_RB_MAX];
  unsigned short rx_lengths[NB_RB_MAX];
  unsigned char *tx_sdu;

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  start_meas(&UE_mac_inst[module_idP].rx_dlsch_sdu);
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_SEND_SDU, VCD_FUNCTION_IN);

  LOG_T(MAC,"sdu: %x.%x.%x\n",sdu[0],sdu[1],sdu[2]);

#if defined(USER_MODE) && defined(OAI_EMU)
  if (oai_emulation.info.opt_enabled) {
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      trace_pdu(1, sdu, sdu_len, module_idP, 3, UE_mac_inst[module_idP].crnti,
          UE_mac_inst[module_idP].subframe, 0, 0);
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  }
#endif

  payload_ptr = parse_header(sdu,&num_ce,&num_sdu,rx_ces,rx_lcids,rx_lengths,sdu_len);

#ifdef DEBUG_HEADER_PARSING
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  LOG_D(MAC,"[UE %d] ue_send_sdu : Frame %d eNB_index %d : num_ce %d num_sdu %d\n",module_idP,
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      frameP,eNB_index,num_ce,num_sdu);
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#endif

#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
  LOG_T(MAC,"[eNB %d] First 32 bytes of DLSCH : \n");
  for (i=0;i<32;i++)
    LOG_T(MAC,"%x.",sdu[i]);
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  LOG_T(MAC,"\n");
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#endif

  for (i=0;i<num_ce;i++) {
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      //    printf("ce %d : %d\n",i,rx_ces[i]);
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      switch (rx_ces[i]) {
      case UE_CONT_RES:

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        LOG_I(MAC,"[UE %d][RAPROC] Frame %d : received contention resolution msg: %x.%x.%x.%x.%x.%x, Terminating RA procedure\n",
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            module_idP,frameP,payload_ptr[0],payload_ptr[1],payload_ptr[2],payload_ptr[3],payload_ptr[4],payload_ptr[5]);
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        if (UE_mac_inst[module_idP].RA_active == 1) {
            LOG_I(MAC,"[UE %d][RAPROC] Frame %d : Clearing RA_active flag\n");
            UE_mac_inst[module_idP].RA_active=0;
            // check if RA procedure has finished completely (no contention)
            tx_sdu = &UE_mac_inst[module_idP].CCCH_pdu.payload[3];
            //Note: 3 assumes sizeof(SCH_SUBHEADER_SHORT) + PADDING CE, which is when UL-Grant has TBS >= 9 (64 bits)
            // (other possibility is 1 for TBS=7 (SCH_SUBHEADER_FIXED), or 2 for TBS=8 (SCH_SUBHEADER_FIXED+PADDING or SCH_SUBHEADER_SHORT)
            for (i=0;i<6;i++)
              if (tx_sdu[i] != payload_ptr[i]) {
                  LOG_E(MAC,"[UE %d][RAPROC] Contention detected, RA failed\n",module_idP);
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                  mac_xface->ra_failed(module_idP,CC_id,eNB_index);
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                  UE_mac_inst[module_idP].RA_contention_resolution_timer_active = 0;
                  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_SEND_SDU, VCD_FUNCTION_OUT);
                  return;
              }
            LOG_I(MAC,"[UE %d][RAPROC] Frame %d : Clearing contention resolution timer\n");
            UE_mac_inst[module_idP].RA_contention_resolution_timer_active = 0;
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            mac_xface->ra_succeeded(module_idP,CC_id,eNB_index);
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        }
        payload_ptr+=6;
        break;
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      case TIMING_ADV_CMD:
#ifdef DEBUG_HEADER_PARSING
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        LOG_D(MAC,"[UE] CE %d : UE Timing Advance : %d\n",i,payload_ptr[0]);
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#endif
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        //mac_xface->process_timing_advance(module_idP,payload_ptr[0]);
        payload_ptr++;
        break;
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      case DRX_CMD:
#ifdef DEBUG_HEADER_PARSING
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        LOG_D(MAC,"[UE] CE %d : UE DRX :",i);
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#endif
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        payload_ptr++;
        break;
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      }
  }
  for (i=0;i<num_sdu;i++) {
#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[UE] SDU %d : LCID %d, length %d\n",i,rx_lcids[i],rx_lengths[i]);
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#endif
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      if (rx_lcids[i] == CCCH) {

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          LOG_D(MAC,"[UE %d] Frame %d : DLSCH -> DL-CCCH, RRC message (eNB %d, %d bytes)\n",module_idP,frameP, eNB_index, rx_lengths[i]);
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#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
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          int j;
          for (j=0;j<rx_lengths[i];j++)
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            LOG_T(MAC,"%x.",(uint8_t)payload_ptr[j]);
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          LOG_T(MAC,"\n");
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#endif
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          mac_rrc_data_ind(module_idP,
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              frameP,
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              CCCH,
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              (uint8_t *)payload_ptr,rx_lengths[i],0,eNB_index,0);
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      }
      else if (rx_lcids[i] == DCCH) {
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          LOG_D(MAC,"[UE %d] Frame %d : DLSCH -> DL-DCCH%d, RRC message (eNB %d, %d bytes)\n", module_idP, frameP, rx_lcids[i],eNB_index,rx_lengths[i]);
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          mac_rlc_data_ind(eNB_index,
              module_idP,
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              frameP,
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              ENB_FLAG_NO,
              MBMS_FLAG_NO,
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              DCCH,
              (char *)payload_ptr,
              rx_lengths[i],
              1,
              NULL);
      }
      else if (rx_lcids[i] == DCCH1) {
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          LOG_D(MAC,"[UE %d] Frame %d : DLSCH -> DL-DCCH%d, RRC message (eNB %d, %d bytes)\n", module_idP, frameP, rx_lcids[i], eNB_index,rx_lengths[i]);
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          mac_rlc_data_ind(eNB_index,
              module_idP,
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              frameP,
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              ENB_FLAG_NO,
              MBMS_FLAG_NO,
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              DCCH1,
              (char *)payload_ptr,
              rx_lengths[i],
              1,
              NULL);
      }
      else if (rx_lcids[i] == DTCH) {
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          LOG_D(MAC,"[UE %d] Frame %d : DLSCH -> DL-DTCH%d (eNB %d, %d bytes)\n", module_idP, frameP,rx_lcids[i], eNB_index,rx_lengths[i]);
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#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
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          int j;
          for (j=0;j<rx_lengths[i];j++)
            LOG_T(MAC,"%x.",(unsigned char)payload_ptr[j]);
          LOG_T(MAC,"\n");
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#endif

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          mac_rlc_data_ind(eNB_index,
              module_idP,
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              frameP,
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              ENB_FLAG_NO,
              MBMS_FLAG_NO,
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              DTCH,
              (char *)payload_ptr,
              rx_lengths[i],
              1,
              NULL);
      }
      payload_ptr+= rx_lengths[i];
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  }
  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_SEND_SDU, VCD_FUNCTION_OUT);
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  stop_meas(&UE_mac_inst[module_idP].rx_dlsch_sdu);
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}

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void ue_decode_si(module_id_t module_idP,int CC_id,frame_t frameP, uint8_t eNB_index, void *pdu,uint16_t len) {
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  start_meas(&UE_mac_inst[module_idP].rx_si);
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_DECODE_SI, VCD_FUNCTION_IN);

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  LOG_D(MAC,"[UE %d] Frame %d Sending SI to RRC (LCID Id %d,len %d)\n",module_idP,frameP,BCCH,len);
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  mac_rrc_data_ind(module_idP,
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      frameP,
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      BCCH,
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      (uint8_t *)pdu,
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      len,
      0,
      eNB_index,
      0);
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_DECODE_SI, VCD_FUNCTION_OUT);
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  stop_meas(&UE_mac_inst[module_idP].rx_si);
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}

#ifdef Rel10
unsigned char *parse_mch_header(unsigned char *mac_header,
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				unsigned char *num_sdu,
				unsigned char *rx_lcids,
				unsigned short *rx_lengths,
				unsigned short tb_length) {
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  unsigned char not_done=1, num_sdus=0, lcid, i;
  unsigned char *mac_header_ptr = mac_header;
  unsigned short length;
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  while (not_done == 1) {
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      if (((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E == 0) {
          not_done = 0;
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      }
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      lcid = ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID;
      if (lcid < SHORT_PADDING) {// subheader for MSI, MCCH or MTCH
          if (not_done == 0) { // last MAC SDU, length is implicit
              mac_header_ptr++;
              length = tb_length- (mac_header_ptr - mac_header);
              for (i=0; i<num_sdus; i++)
                length -= rx_lengths[i];
          }
          else { // not the last MAC SDU
              if ( ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F == 1) {// subheader has length of 3octets
                  //	  length = ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L;
                  length = ((((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_MSB & 0x7f ) << 8 ) | (((SCH_SUBHEADER_LONG *)mac_header_ptr)->L_LSB & 0xff);
                  mac_header_ptr += 3;
              }
              else {// subheader has length of 2octets
                  length = ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L;
                  mac_header_ptr += 2;
              }
          }
          rx_lcids[num_sdus] = lcid;
          rx_lengths[num_sdus] = length;
          num_sdus++;
      }
      else {// subheader for padding
          //     if (lcid == SHORT_PADDING)
          mac_header_ptr++;
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      }
  }
  *num_sdu = num_sdus;
  return(mac_header_ptr);
}

// this function is for sending mch_sdu from phy to mac
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void ue_send_mch_sdu(module_id_t module_idP, frame_t frameP, uint8_t *sdu, uint16_t sdu_len, uint8_t eNB_index, uint8_t sync_area) {
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  unsigned char num_sdu, i, *payload_ptr;
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  unsigned char rx_lcids[NB_RB_MAX];
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  unsigned short rx_lengths[NB_RB_MAX];

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  start_meas(&UE_mac_inst[module_idP].rx_mch_sdu);
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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_SEND_MCH_SDU, VCD_FUNCTION_IN);
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  LOG_D(MAC,"[UE %d] Frame %d : process the mch PDU for sync area %d \n",module_idP,frameP, sync_area);
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  LOG_D(MAC,"[UE %d] sdu: %x.%x\n", module_idP,sdu[0], sdu[1]);
  LOG_D(MAC,"[UE %d] parse_mch_header, demultiplex\n",module_idP);
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  payload_ptr = parse_mch_header(sdu, &num_sdu, rx_lcids, rx_lengths, sdu_len);
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  LOG_D(MAC,"[UE %d] parse_mch_header, found %d sdus\n",module_idP,num_sdu);
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  for (i=0; i<num_sdu; i++) {
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      if (rx_lcids[i] == MCH_SCHDL_INFO) {
          if (UE_mac_inst[module_idP].mcch_status==1) {
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              LOG_I(MAC,"[UE %d] Frame %d : MCH->MSI for sync area %d (eNB %d, %d bytes)\n",module_idP,frameP, sync_area, eNB_index, rx_lengths[i]);
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              // ??store necessary scheduling info to ue_mac_inst in order to
              // calculate exact position of interested service (for the complex case has >1 mtch)
              // set msi_status to 1
              UE_mac_inst[module_idP].msi_status = 1;
          }
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      }
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      else if (rx_lcids[i] == MCCH_LCHANID) {
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          LOG_I(MAC,"[UE %d] Frame %d : SDU %d MCH->MCCH for sync area %d (eNB %d, %d bytes)\n",module_idP,frameP, i, sync_area, eNB_index, rx_lengths[i]);
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          mac_rrc_data_ind(module_idP,
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              frameP,
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              MCCH,
              payload_ptr, rx_lengths[i], 0, eNB_index, sync_area);
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      }
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      else if (rx_lcids[i] == MTCH) {
          if (UE_mac_inst[module_idP].msi_status==1) {
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              LOG_I(MAC,"[UE %d] Frame %d : MCH->MTCH for sync area %d (eNB %d, %d bytes)\n",module_idP,frameP, sync_area, eNB_index, rx_lengths[i]);
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              mac_rlc_data_ind(
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                  0,
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                  module_idP,
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                  frameP,
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                  ENB_FLAG_NO,
                  MBMS_FLAG_YES,
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                  MTCH, /*+ (maxDRB + 3),*/
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                  (char *)payload_ptr,
                  rx_lengths[i],
                  1,
                  NULL);

          }
      } else {
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          LOG_W(MAC,"[UE %d] Frame %d : unknown sdu %d rx_lcids[%d]=%d mcch status %d eNB %d \n",
              module_idP,
              frameP,
              rx_lengths[i],
              i,
              rx_lcids[i],
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              UE_mac_inst[module_idP].mcch_status, eNB_index);
      }

      payload_ptr += rx_lengths[i];
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  }

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  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_UE_SEND_MCH_SDU, VCD_FUNCTION_OUT);
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  stop_meas(&UE_mac_inst[module_idP].rx_mch_sdu);
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}

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int8_t ue_get_mbsfn_sf_alloction (module_id_t module_idP, uint8_t mbsfn_sync_area, unsigned char eNB_index){
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  // currently there is one-to-one mapping between sf allocation pattern and sync area
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  if (mbsfn_sync_area > MAX_MBSFN_AREA){
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      LOG_W(MAC,"[UE %d] MBSFN synchronization area %d out of range for eNB %d\n ", module_idP, mbsfn_sync_area, eNB_index);
      return -1;
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  }
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  else if (UE_mac_inst[module_idP].mbsfn_SubframeConfig[mbsfn_sync_area] != NULL)
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    return mbsfn_sync_area;
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  else {
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      LOG_W(MAC,"[UE %d] MBSFN Subframe Config pattern %d not found \n ", module_idP, mbsfn_sync_area);
      return -1;
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  }
}
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int ue_query_mch(module_id_t module_idP, uint32_t frameP, uint32_t subframe, uint8_t eNB_index,uint8_t *sync_area, uint8_t *mcch_active) {
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  int i=0, j=0, ii=0, msi_pos=0, mcch_mcs = - 1;
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  int mcch_flag=0, mtch_flag=0, msi_flag=0;
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  int mbsfn_period = 0;// 1<<(UE_mac_inst[module_idP].mbsfn_SubframeConfig[0]->radioframeAllocationPeriod);
  int mcch_period = 0;// 32<<(UE_mac_inst[module_idP].mbsfn_AreaInfo[0]->mcch_Config_r9.mcch_RepetitionPeriod_r9);
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  int mch_scheduling_period = -1;
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  start_meas(&UE_mac_inst[module_idP].ue_query_mch);

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  if (UE_mac_inst[module_idP].pmch_Config[0])
    mch_scheduling_period = 8<<(UE_mac_inst[module_idP].pmch_Config[0]->mch_SchedulingPeriod_r9);
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  for (i=0;
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      i< UE_mac_inst[module_idP].num_active_mbsfn_area;
      i++ ){
      // assume, that there is always a mapping
      if ((j=ue_get_mbsfn_sf_alloction(module_idP,i,eNB_index)) == -1)
        return -1; // continue;
      ii=0;
      msi_pos=0;
      mbsfn_period = 1<<(UE_mac_inst[module_idP].mbsfn_SubframeConfig[0]->radioframeAllocationPeriod);
      mcch_period = 32<<(UE_mac_inst[module_idP].mbsfn_AreaInfo[0]->mcch_Config_r9.mcch_RepetitionPeriod_r9);

      LOG_D(MAC,"[UE %d] Frame %d subframe %d: Checking MBSFN Sync Area %d/%d with SF allocation %d/%d for MCCH and MTCH (mbsfn period %d, mcch period %d,mac sched period (%d,%d))\n",
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          module_idP,frameP, subframe,i,UE_mac_inst[module_idP].num_active_mbsfn_area,
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          j,UE_mac_inst[module_idP].num_sf_allocation_pattern,mbsfn_period,mcch_period,
          mch_scheduling_period,UE_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationOffset);

      // get the real MCS value
      switch (UE_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;
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      }
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      if (frameP % mbsfn_period == UE_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationOffset){ // MBSFN frameP
          if (UE_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.present == MBSFN_SubframeConfig__subframeAllocation_PR_oneFrame){// one-frameP format
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              if (UE_mac_inst[module_idP].pmch_Config[0]) {
                  //  Find the first subframe in this MCH to transmit MSI
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                  if (frameP % mch_scheduling_period == UE_mac_inst[module_idP].mbsfn_SubframeConfig[j]->radioframeAllocationOffset ) {
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                      while (ii == 0) {
                          ii = UE_mac_inst[module_idP].mbsfn_SubframeConfig[j]->subframeAllocation.choice.oneFrame.buf[0] & (0x80>>msi_pos);
                          msi_pos++;
                      }
                  }
              }

              // Check if the subframe is for MSI, MCCH or MTCHs and Set the correspoding flag to 1
              switch (subframe) {
              case 1:
                if (mac_xface->lte_frame_parms->frame_type == FDD) {
                    if ((UE_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;
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                        if ( (frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ( (frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ( (frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ( (frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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 ((UE_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;
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                        if ((frameP % mcch_period == UE_mac_inst[module_idP].mbsfn_AreaInfo[i]->mcch_Config_r9.mcch_Offset_r9) &&
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                            ((UE_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,"[UE %d] Frame %d Subframe %d: sync area %d SF alloc %d: msi flag %d, mcch flag %d, mtch flag %d\n",
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                      module_idP, frameP, subframe,i,j,msi_flag,mcch_flag,mtch_flag);
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                  *sync_area=i;
                  break;
              }
          }
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          else {// four-frameP format
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          }
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      }
  } // end of for
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  stop_meas(&UE_mac_inst[module_idP].ue_query_mch);
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  if ( (mcch_flag==1))// || (msi_flag==1))
    *mcch_active=1;

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  if ( (mcch_flag==1) || ((msi_flag==1) && (UE_mac_inst[module_idP].mcch_status==1)) ){
      return mcch_mcs;
  } else if ((mtch_flag==1) && (UE_mac_inst[module_idP].msi_status==1))
    return UE_mac_inst[module_idP].pmch_Config[0]->dataMCS_r9;
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  else
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    return -1;
}

#endif

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unsigned char generate_ulsch_header(uint8_t *mac_header,
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				    uint8_t num_sdus,
				    uint8_t short_padding,
				    uint16_t *sdu_lengths,
				    uint8_t *sdu_lcids,
				    POWER_HEADROOM_CMD *power_headroom,
				    uint16_t *crnti,
				    BSR_SHORT *truncated_bsr,
				    BSR_SHORT *short_bsr,
				    BSR_LONG *long_bsr,
				    unsigned short post_padding) {
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  SCH_SUBHEADER_FIXED *mac_header_ptr = (SCH_SUBHEADER_FIXED *)mac_header;
  unsigned char first_element=0,last_size=0,i;
  unsigned char mac_header_control_elements[16],*ce_ptr;

  LOG_D(MAC,"[UE] Generate ULSCH : num_sdus %d\n",num_sdus);
#ifdef DEBUG_HEADER_PARSING
  for (i=0;i<num_sdus;i++)
    LOG_T(MAC,"[UE] sdu %d : lcid %d length %d",i,sdu_lcids[i],sdu_lengths[i]);
  LOG_T(MAC,"\n");
#endif
  ce_ptr = &mac_header_control_elements[0];

  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 (power_headroom) {
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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 = POWER_HEADROOM;
      last_size=1;
      *((POWER_HEADROOM_CMD *)ce_ptr)=(*power_headroom);
      ce_ptr+=sizeof(POWER_HEADROOM_CMD);
      LOG_D(MAC, "phr header size %d\n",sizeof(POWER_HEADROOM_CMD));
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  }

  if (crnti) {
#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[UE] CRNTI : %x (first_element %d)\n",*crnti,first_element);
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#endif
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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 = CRNTI;
      last_size=1;
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      *((uint16_t *)ce_ptr)=(*crnti);
      ce_ptr+=sizeof(uint16_t);
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      //    printf("offset %d\n",ce_ptr-mac_header_control_elements);
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  }

  if (truncated_bsr) {
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      if (first_element>0) {
          mac_header_ptr->E = 1;
          /*
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      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);
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           */
          mac_header_ptr++;
      }
      else {
          first_element=1;
      }
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#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[UE] Scheduler Truncated BSR Header\n");
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#endif
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      mac_header_ptr->R = 0;
      mac_header_ptr->E    = 0;
      mac_header_ptr->LCID = TRUNCATED_BSR;
      last_size=1;
      *((BSR_TRUNCATED *)ce_ptr)=(*truncated_bsr);
      ce_ptr+=sizeof(BSR_TRUNCATED);

      //    printf("(cont_res) : offset %d\n",ce_ptr-mac_header_control_elements);
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  }
  else if (short_bsr) {
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      if (first_element>0) {
          mac_header_ptr->E = 1;
          /*
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      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);
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           */
          mac_header_ptr++;
      }
      else {
          first_element=1;
      }
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#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[UE] Scheduler SHORT BSR Header\n");
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#endif
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      mac_header_ptr->R = 0;
      mac_header_ptr->E    = 0;
      mac_header_ptr->LCID = SHORT_BSR;
      last_size=1;
      *((BSR_SHORT *)ce_ptr)=(*short_bsr);
      ce_ptr+=sizeof(BSR_SHORT);

      //    printf("(cont_res) : offset %d\n",ce_ptr-mac_header_control_elements);
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  }
  else if (long_bsr) {
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      if (first_element>0) {
          mac_header_ptr->E = 1;
          /*
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      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);
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           */
          mac_header_ptr++;
      }
      else {
          first_element=1;
      }
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#ifdef DEBUG_HEADER_PARSING
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      LOG_D(MAC,"[UE] Scheduler Long BSR Header\n");
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#endif
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      mac_header_ptr->R = 0;
      mac_header_ptr->E    = 0;
      mac_header_ptr->LCID = LONG_BSR;
      last_size=1;

      *(ce_ptr)     = (long_bsr->Buffer_size0 << 2) | ((long_bsr->Buffer_size1 & 0x30) >> 4);
      *(ce_ptr + 1) = ((long_bsr->Buffer_size1 & 0x0F) << 4) | ((long_bsr->Buffer_size2 & 0x3C) >> 2);
      *(ce_ptr + 2) = ((long_bsr->Buffer_size2 & 0x03) << 2) | (long_bsr->Buffer_size3 & 0x3F);
      /* Padding */
      *(ce_ptr + 3) = 0;
      ce_ptr += BSR_LONG_SIZE;

      //    printf("(cont_res) : offset %d\n",ce_ptr-mac_header_control_elements);
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  }
  //  printf("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);

  for (i=0;i<num_sdus;i++) {
#ifdef DEBUG_HEADER_PARSING
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      LOG_T(MAC,"[UE] sdu subheader %d (lcid %d, %d bytes)\n",i,sdu_lcids[i],sdu_lengths[i]);
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#endif
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      if ((first_element>0)) {
          mac_header_ptr->E = 1;
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#ifdef DEBUG_HEADER_PARSING
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          LOG_D(MAC,"[UE] 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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#endif
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          mac_header_ptr+=last_size;
          //      printf("last_size %d,mac_header_ptr %p\n",last_size,mac_header_ptr);
      }
      else {
          first_element=1;
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      }
      if (sdu_lengths[i] < 128) {
          ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R    = 0; // 3
          ((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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#ifdef DEBUG_HEADER_PARSING
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          LOG_D(MAC,"[UE] short sdu\n");
          LOG_T(MAC,"[UE] last subheader : %x (R%d,E%d,LCID%d,F%d,L%d)\n",
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              ((uint16_t*)mac_header_ptr)[0],
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              ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R,
              ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->E,
              ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->LCID,
              ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F,
              ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L);
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#endif
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      }
      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,"[UE] long sdu\n");
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#endif
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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++;
      //mac_header_ptr=last_size; // FIXME: should be ++
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  }
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  if ((ce_ptr-mac_header_control_elements) > 0) {
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      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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