eNB_scheduler.c 136 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.c
* \brief procedures related to UE
* \author Raymond Knopp, Navid Nikaein
* \date 2011
* \version 0.5
* @ingroup _mac

*/

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

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

#include "LAYER2/MAC/defs.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"

double snr_mcs[28]={-4.1130, -3.3830, -2.8420, -2.0480, -1.3230, -0.6120, 0.1080, 0.977, 1.7230, 2.7550, 3.1960, 3.8080, 4.6870, 5.6840, 6.6550, 7.7570, 8.3730, 9.3040, 9.5990, 10.9020, 11.7220, 12.5950, 13.4390, 14.8790, 15.8800, 16.4800, 17.8690, 18.7690};
int cqi_mcs[3][16] = {{0, 0, 0, 2, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27, 27},{0, 0, 0, 2, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27, 27},{0, 0, 0, 2, 4, 6, 8, 11, 13, 15, 18, 19, 22, 24, 26, 27}};
double cqi_snr[16] = {-8, -7, -6.08, -5.252, -3.956, -2.604, -1.107, 0.87, 2.599, 4.79, 6.716, 8, 10.593, 13.286, 15.745, 18.5};
double snr_tm6=0;


#define ENABLE_MAC_PAYLOAD_DEBUG
#define DEBUG_eNB_SCHEDULER 1
//#define DEBUG_HEADER_PARSING 1
//#define DEBUG_PACKET_TRACE 1

//#define ICIC 0

/*
  #ifndef USER_MODE
  #define msg debug_msg
  #endif
*/

extern inline unsigned int taus(void);


void init_ue_sched_info(void){
  int i,j;
  for (i=0;i<NUMBER_OF_eNB_MAX;i++){
    for (j=0;j<NUMBER_OF_UE_MAX;j++){
      // init DL
      eNB_dlsch_info[i][j].weight           = 0;
      eNB_dlsch_info[i][j].subframe         = 0;
      eNB_dlsch_info[i][j].serving_num      = 0;
      eNB_dlsch_info[i][j].status           = S_DL_NONE;
      // init UL
      eNB_ulsch_info[i][j].subframe         = 0;
      eNB_ulsch_info[i][j].serving_num      = 0;
      eNB_ulsch_info[i][j].status           = S_UL_NONE;
    }
  }
}

void add_ue_ulsch_info(unsigned char Mod_id, unsigned char UE_id, unsigned char subframe, UE_ULSCH_STATUS status){

  eNB_ulsch_info[Mod_id][UE_id].rnti             = find_UE_RNTI(Mod_id,UE_id);
  eNB_ulsch_info[Mod_id][UE_id].subframe         = subframe;
  eNB_ulsch_info[Mod_id][UE_id].status           = status;

  eNB_ulsch_info[Mod_id][UE_id].serving_num++;

}
void add_ue_dlsch_info(unsigned char Mod_id, unsigned char UE_id, unsigned char subframe, UE_DLSCH_STATUS status){

  eNB_dlsch_info[Mod_id][UE_id].rnti             = find_UE_RNTI(Mod_id,UE_id);
  //  eNB_dlsch_info[Mod_id][UE_id].weight           = weight;
  eNB_dlsch_info[Mod_id][UE_id].subframe         = subframe;
  eNB_dlsch_info[Mod_id][UE_id].status           = status;

  eNB_dlsch_info[Mod_id][UE_id].serving_num++;

}

unsigned char get_ue_weight(unsigned char Mod_id, unsigned char UE_id){

  return(eNB_dlsch_info[Mod_id][UE_id].weight);

}

// return is rnti ???
unsigned char schedule_next_ulue(unsigned char Mod_id, unsigned char UE_id, unsigned char subframe){

  unsigned char next_ue;

  // first phase: scheduling for ACK
  switch (subframe) {
    // scheduling for subframe 2: for scheduled user during subframe 5 and 6
  case 8:
    if  ((eNB_dlsch_info[Mod_id][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[Mod_id][UE_id].subframe == 5 || eNB_dlsch_info[Mod_id][UE_id].subframe == 6)){
      // set the downlink status
      eNB_dlsch_info[Mod_id][UE_id].status = S_DL_BUFFERED;
      return UE_id;
    }
    break;
    // scheduling for subframe 3: for scheduled user during subframe 7 and 8
  case 9:
    if  ((eNB_dlsch_info[Mod_id][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[Mod_id][UE_id].subframe == 7 || eNB_dlsch_info[Mod_id][UE_id].subframe == 8)){
      eNB_dlsch_info[Mod_id][UE_id].status = S_DL_BUFFERED;
      return UE_id;
    }
    break;
    // scheduling UL subframe 4: for scheduled user during subframe 9 and 0
  case 0 :
    if  ((eNB_dlsch_info[Mod_id][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[Mod_id][UE_id].subframe == 9 || eNB_dlsch_info[Mod_id][UE_id].subframe == 0)){
      eNB_dlsch_info[Mod_id][UE_id].status = S_DL_BUFFERED;
      return UE_id;
    }
    break;
  default:
    break;
  }

  // second phase
  for (next_ue=0; next_ue <NUMBER_OF_UE_MAX; next_ue++ ){

    if  (eNB_ulsch_info[Mod_id][next_ue].status == S_UL_WAITING )
      return next_ue;
    else if (eNB_ulsch_info[Mod_id][next_ue].status == S_UL_SCHEDULED){
      eNB_ulsch_info[Mod_id][next_ue].status = S_UL_BUFFERED;
    }
  }
  for (next_ue=0; next_ue <NUMBER_OF_UE_MAX; next_ue++ ){
    if (eNB_ulsch_info[Mod_id][next_ue].status != S_UL_NONE )// do this just for active UEs
      eNB_ulsch_info[Mod_id][next_ue].status = S_UL_WAITING;
  }
  next_ue = 0;
  return next_ue;

}

unsigned char schedule_next_dlue(unsigned char Mod_id, unsigned char subframe){

  unsigned char next_ue;

  for (next_ue=0; next_ue <NUMBER_OF_UE_MAX; next_ue++ ){
    if  (eNB_dlsch_info[Mod_id][next_ue].status == S_DL_WAITING)
      return next_ue;
  }
  for (next_ue=0; next_ue <NUMBER_OF_UE_MAX; next_ue++ )
    if  (eNB_dlsch_info[Mod_id][next_ue].status == S_DL_BUFFERED) {
      eNB_dlsch_info[Mod_id][next_ue].status = S_DL_WAITING;
    }
  // next_ue = -1;
  return (-1);//next_ue;

}

void initiate_ra_proc(u8 Mod_id, u32 frame, u16 preamble_index,s16 timing_offset,u8 sect_id,u8 subframe,u8 f_id) {

  u8 i;

  LOG_I(MAC,"[eNB %d][RAPROC] Frame %d Initiating RA procedure for preamble index %d\n",Mod_id,frame,preamble_index);

  for (i=0;i<NB_RA_PROC_MAX;i++) {
    if (eNB_mac_inst[Mod_id].RA_template[i].RA_active==0) {
      eNB_mac_inst[Mod_id].RA_template[i].RA_active=1;
      eNB_mac_inst[Mod_id].RA_template[i].generate_rar=1;
      eNB_mac_inst[Mod_id].RA_template[i].generate_Msg4=0;
      eNB_mac_inst[Mod_id].RA_template[i].wait_ack_Msg4=0;
      eNB_mac_inst[Mod_id].RA_template[i].timing_offset=timing_offset;
      // Put in random rnti (to be replaced with proper procedure!!)
      eNB_mac_inst[Mod_id].RA_template[i].rnti = taus();
      eNB_mac_inst[Mod_id].RA_template[i].RA_rnti = 1+subframe+(10*f_id);
      eNB_mac_inst[Mod_id].RA_template[i].preamble_index = preamble_index;
      LOG_D(MAC,"[eNB %d][RAPROC] Frame %d Activating RAR generation for process %d, rnti %x, RA_active %d\n",
	    Mod_id,frame,i,eNB_mac_inst[Mod_id].RA_template[i].rnti,
	    eNB_mac_inst[Mod_id].RA_template[i].RA_active);
      
      return;
    }
  }
}

void cancel_ra_proc(u8 Mod_id, u32 frame, u16 rnti) {
  unsigned char i;
  LOG_I(MAC,"[eNB %d][RAPROC] Frame %d Cancelling RA procedure for UE rnti %x\n",Mod_id,frame,rnti);

  for (i=0;i<NB_RA_PROC_MAX;i++) {
    if (rnti == eNB_mac_inst[Mod_id].RA_template[i].rnti) {
      eNB_mac_inst[Mod_id].RA_template[i].RA_active=0;
      eNB_mac_inst[Mod_id].RA_template[i].generate_rar=0;
      eNB_mac_inst[Mod_id].RA_template[i].generate_Msg4=0;
      eNB_mac_inst[Mod_id].RA_template[i].wait_ack_Msg4=0;
      eNB_mac_inst[Mod_id].RA_template[i].timing_offset=0;
      eNB_mac_inst[Mod_id].RA_template[i].RRC_timer=20;
      eNB_mac_inst[Mod_id].RA_template[i].rnti = 0;
    }
  }
}

void terminate_ra_proc(u8 Mod_id,u32 frame,u16 rnti,unsigned char *msg3, u16 msg3_len) {

  unsigned char rx_ces[MAX_NUM_CE],num_ce,num_sdu,i,*payload_ptr;
  unsigned char rx_lcids[NB_RB_MAX];
  u16 rx_lengths[NB_RB_MAX];
  s8 UE_id;

  LOG_I(MAC,"[eNB %d][RAPROC] Frame %d, Received msg3 %x.%x.%x.%x.%x.%x, Terminating RA procedure for UE rnti %x\n",
	Mod_id,frame,
	msg3[3],msg3[4],msg3[5],msg3[6],msg3[7], msg3[8], rnti);

  for (i=0;i<NB_RA_PROC_MAX;i++) {
    LOG_D(MAC,"[RAPROC] Checking proc %d : rnti (%x, %x), active %d\n",i,
	  eNB_mac_inst[Mod_id].RA_template[i].rnti, rnti,
	    eNB_mac_inst[Mod_id].RA_template[i].RA_active);
    if ((eNB_mac_inst[Mod_id].RA_template[i].rnti==rnti) &&
	(eNB_mac_inst[Mod_id].RA_template[i].RA_active==1)) {

      payload_ptr = parse_ulsch_header(msg3,&num_ce,&num_sdu,rx_ces,rx_lcids,rx_lengths,msg3_len);
	LOG_D(MAC,"[eNB %d][RAPROC] Frame %d Received CCCH: length %d, offset %d\n",
	      Mod_id,frame,rx_lengths[0],payload_ptr-msg3);
      if ((num_ce == 0) && (num_sdu==1) && (rx_lcids[0] == CCCH)) { // This is an RRCConnectionRequest/Restablishment
	memcpy(&eNB_mac_inst[Mod_id].RA_template[i].cont_res_id[0],payload_ptr,6);
	LOG_D(MAC,"[eNB %d][RAPROC] Frame %d Received CCCH: length %d, offset %d\n",
	      Mod_id,frame,rx_lengths[0],payload_ptr-msg3);
	UE_id=add_new_ue(Mod_id,eNB_mac_inst[Mod_id].RA_template[i].rnti);
	if (UE_id==-1) {
	  mac_xface->macphy_exit("[MAC][eNB] Max user count reached\n");
	}
	else {
	  LOG_I(MAC,"[eNB %d][RAPROC] Frame %d Added user with rnti %x => UE %d\n",
		Mod_id,frame,eNB_mac_inst[Mod_id].RA_template[i].rnti,UE_id);
	}

	if (Is_rrc_registered == 1)
	  mac_rrc_data_ind(Mod_id,frame,CCCH,(char *)payload_ptr,rx_lengths[0],1,Mod_id);
	  // add_user.  This is needed to have the rnti for configuring UE (PHY). The UE is removed if RRC
	  // doesn't provide a CCCH SDU

      }
      else if (num_ce >0) {  // handle msg3 which is not RRCConnectionRequest
	//	process_ra_message(msg3,num_ce,rx_lcids,rx_ces);
      }
 
      eNB_mac_inst[Mod_id].RA_template[i].generate_Msg4 = 1;
      eNB_mac_inst[Mod_id].RA_template[i].wait_ack_Msg4 = 0;

      return;
    } // if process is active

  } // loop on RA processes
}

DCI_PDU *get_dci_sdu(u8 Mod_id, u32 frame, u8 subframe) {

  return(&eNB_mac_inst[Mod_id].DCI_pdu);

}

s8 find_UE_id(unsigned char Mod_id,u16 rnti) {

  unsigned char i;

  for (i=0;i<NUMBER_OF_UE_MAX;i++) {
    if (eNB_mac_inst[Mod_id].UE_template[i].rnti==rnti) {
      return(i);
    }
  }
  return(-1);

}

s16 find_UE_RNTI(unsigned char Mod_id, unsigned char UE_id) {

  return (eNB_mac_inst[Mod_id].UE_template[UE_id].rnti);

}
u8 is_UE_active(unsigned char Mod_id, unsigned char UE_id ){
  if (eNB_mac_inst[Mod_id].UE_template[UE_id].rnti !=0 )
    return 1;
  else
    return 0 ;
}
s8 find_active_UEs(unsigned char Mod_id){

  unsigned char UE_id;
  u16 rnti;
  unsigned char nb_active_ue=0;

  for (UE_id=0;UE_id<NUMBER_OF_UE_MAX;UE_id++) {

    if (((rnti=eNB_mac_inst[Mod_id].UE_template[UE_id].rnti) !=0)&&(eNB_mac_inst[Mod_id].UE_template[UE_id].ul_active==1)){

      if (mac_xface->get_eNB_UE_stats(Mod_id,rnti) != NULL){ // check at the phy enb_ue state for this rnti
	nb_active_ue++;
      }
      else { // this ue is removed at the phy => remove it at the mac as well
	mac_remove_ue(Mod_id, UE_id);
      }
    }
  }
  return(nb_active_ue);
}

// function for determining which active ue should be granted resources in uplink based on BSR+QoS
u16 find_ulgranted_UEs(unsigned char Mod_id){

  // all active users should be granted
  return(find_active_UEs(Mod_id));
}

// function for determining which active ue should be granted resources in downlink based on CQI, SI, and BSR
u16 find_dlgranted_UEs(unsigned char Mod_id){

  // all active users should be granted
  return(find_active_UEs(Mod_id));
}
// get aggregatiob form phy for a give UE
unsigned char process_ue_cqi (unsigned char Mod_id, unsigned char UE_id) {

  unsigned char aggregation=2;
  // check the MCS and SNR and set the aggregation accordingly

  return aggregation;
}
#ifdef CBA
u8 find_num_active_UEs_in_cbagroup(unsigned char Mod_id, unsigned char group_id){

  u8 UE_id;
  u16 rnti;
  unsigned char nb_ue_in_pusch=0;
  LTE_eNB_UE_stats* eNB_UE_stats;
  
  for (UE_id=group_id;UE_id<NUMBER_OF_UE_MAX;UE_id+=eNB_mac_inst[Mod_id].num_active_cba_groups) {

    if (((rnti=eNB_mac_inst[Mod_id].UE_template[UE_id].rnti) !=0) && 
	(eNB_mac_inst[Mod_id].UE_template[UE_id].ul_active==1)    && 
	(mac_get_rrc_status(Mod_id,1,UE_id) > RRC_CONNECTED)){
      //  && (UE_is_to_be_scheduled(Mod_id,UE_id))) 
      // check at the phy enb_ue state for this rnti
      if ((eNB_UE_stats= mac_xface->get_eNB_UE_stats(Mod_id,rnti)) != NULL){ 
	if ((eNB_UE_stats->mode == PUSCH) && (UE_is_to_be_scheduled(Mod_id,UE_id) == 0)){ 
	  nb_ue_in_pusch++;
	}
      }
    }
  }
  return(nb_ue_in_pusch);
}
#endif 
s8 add_new_ue(unsigned char Mod_id, u16 rnti) {
  unsigned char i;

  for (i=0;i<NUMBER_OF_UE_MAX;i++) {
    if (eNB_mac_inst[Mod_id].UE_template[i].rnti==0) {
      eNB_mac_inst[Mod_id].UE_template[i].rnti=rnti;
      eNB_ulsch_info[Mod_id][i].status = S_UL_WAITING;
      eNB_dlsch_info[Mod_id][i].status = S_UL_WAITING;
      LOG_D(MAC,"[eNB] Add UE_id %d : rnti %x\n",i,eNB_mac_inst[Mod_id].UE_template[i].rnti);
      return((s8)i);
    }
  }
  return(-1);
}

s8 mac_remove_ue(unsigned char Mod_id, unsigned char UE_id) {

  LOG_I(MAC,"Removing UE %d (rnti %x)\n",UE_id,eNB_mac_inst[Mod_id].UE_template[UE_id].rnti);

  // clear all remaining pending transmissions
  eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID0]  = 0;
  eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID1]  = 0;
  eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID2]  = 0;
  eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID3]  = 0;

  eNB_mac_inst[Mod_id].UE_template[UE_id].ul_SR           = 0;
  eNB_mac_inst[Mod_id].UE_template[UE_id].rnti            = 0;
  eNB_mac_inst[Mod_id].UE_template[UE_id].ul_active       = 0;
  eNB_ulsch_info[Mod_id][UE_id].rnti          = 0;
  eNB_ulsch_info[Mod_id][UE_id].status        = S_UL_NONE;
  eNB_dlsch_info[Mod_id][UE_id].rnti          = 0;
  eNB_dlsch_info[Mod_id][UE_id].status        = S_DL_NONE;

  rrc_remove_UE(Mod_id,UE_id);

  return(1);
}

unsigned char *get_dlsch_sdu(u8 Mod_id,u32 frame,u16 rnti,u8 TBindex) {

  unsigned char UE_id;

  if (rnti==SI_RNTI) {
    LOG_D(MAC,"[eNB %d] Frame %d Get DLSCH sdu for BCCH \n",Mod_id,frame);

    return((unsigned char *)&eNB_mac_inst[Mod_id].BCCH_pdu.payload[0]);
  }
  else {

    UE_id = find_UE_id(Mod_id,rnti);
    LOG_D(MAC,"[eNB %d] Frame %d  Get DLSCH sdu for rnti %x => UE_id %d\n",Mod_id,frame,rnti,UE_id);

    return((unsigned char *)&eNB_mac_inst[Mod_id].DLSCH_pdu[UE_id][TBindex].payload[0]);
  }

}

unsigned char *parse_ulsch_header(unsigned char *mac_header,
				  unsigned char *num_ce,
				  unsigned char *num_sdu,
				  unsigned char *rx_ces,
				  unsigned char *rx_lcids,
				  unsigned short *rx_lengths,
				  unsigned short tb_length) {

  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) {

    if (((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E == 0)
      not_done = 0;

    lcid = ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID;
    if (lcid < EXTENDED_POWER_HEADROOM) { 
      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_SHORT *)mac_header_ptr)->F == 0) {
	  length = ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L;
	  mac_header_ptr += 2;//sizeof(SCH_SUBHEADER_SHORT);
	}
	else { // 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;//sizeof(SCH_SUBHEADER_LONG);
	}
      }
      LOG_D(MAC,"[eNB] sdu %d lcid %d tb_length %d length %d (offset now %d)\n",
	    num_sdus,lcid,tb_length, length,mac_header_ptr-mac_header);
      rx_lcids[num_sdus] = lcid;
      rx_lengths[num_sdus] = length;
      num_sdus++;
    }
    else {  // This is a control element subheader POWER_HEADROOM, BSR and CRNTI
      if (lcid == SHORT_PADDING) {
	mac_header_ptr++;
      }
      else {
	rx_ces[num_ces] = lcid;
	num_ces++;
	mac_header_ptr++;	
	if (lcid==LONG_BSR)
	  ce_len+=4;
	else if (lcid==CRNTI)
	  ce_len+=2;
	else if ((lcid==POWER_HEADROOM) || (lcid==TRUNCATED_BSR)|| (lcid== SHORT_BSR))
	  ce_len++;
      }
    }
  }
  *num_ce = num_ces;
  *num_sdu = num_sdus;

  return(mac_header_ptr);
}

void SR_indication(u8 Mod_id,u32 frame, u16 rnti, u8 subframe) {

  u8 UE_id = find_UE_id(Mod_id,rnti);

  LOG_D(MAC,"[eNB %d][SR %x] Frame %d subframe %d Signaling SR for UE %d \n",Mod_id,rnti,frame,subframe, UE_id);
  eNB_mac_inst[Mod_id].UE_template[UE_id].ul_SR = 1;
  eNB_mac_inst[Mod_id].UE_template[UE_id].ul_active = 1;
}

void rx_sdu(u8 Mod_id,u32 frame,u16 rnti,u8 *sdu, u16 sdu_len) {

  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 UE_id = find_UE_id(Mod_id,rnti);
  int ii,j;
  for(ii=0; ii<NB_RB_MAX; ii++) rx_lengths[ii] = 0;
  
  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_RX_SDU,1);

  eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].total_pdu_bytes_rx+=sdu_len;
  eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].total_num_pdus_rx+=1;

  LOG_D(MAC,"[eNB %d] Received ULSCH sdu from PHY (rnti %x, UE_id %d), parsing header\n",Mod_id,rnti,UE_id);
  payload_ptr = parse_ulsch_header(sdu,&num_ce,&num_sdu,rx_ces,rx_lcids,rx_lengths,sdu_len);

  // control element
  for (i=0;i<num_ce;i++) {

    switch (rx_ces[i]) { // implement and process BSR + CRNTI +
    case POWER_HEADROOM:
      eNB_mac_inst[Mod_id].UE_template[UE_id].phr_info =  (payload_ptr[0] & 0x3f);// - PHR_MAPPING_OFFSET; 
      LOG_D(MAC, "[eNB] MAC CE_LCID %d : Received PHR PH = %d (db)\n", rx_ces[i], eNB_mac_inst[Mod_id].UE_template[UE_id].phr_info);
      payload_ptr+=sizeof(POWER_HEADROOM_CMD);
      break;
    case CRNTI:
      LOG_D(MAC, "[eNB] MAC CE_LCID %d : Received CRNTI %d \n", rx_ces[i], payload_ptr[0]);
      payload_ptr+=1;
      break;
    case TRUNCATED_BSR:
    case SHORT_BSR: {
      u8 lcgid;

      lcgid = (payload_ptr[0] >> 6);
      LOG_D(MAC, "[eNB] MAC CE_LCID %d : Received short BSR LCGID = %u bsr = %d\n",
            rx_ces[i], lcgid, payload_ptr[0] & 0x3f);
      eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[lcgid] = (payload_ptr[0] & 0x3f);
      payload_ptr += 1;//sizeof(SHORT_BSR); // fixme
    } break;
    case LONG_BSR:
      eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID0] = ((payload_ptr[0] & 0xFC) >> 2);
      eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID1] =
      ((payload_ptr[0] & 0x03) << 4) | ((payload_ptr[1] & 0xF0) >> 4);
      eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID2] =
      ((payload_ptr[1] & 0x0F) << 2) | ((payload_ptr[2] & 0xC0) >> 6);
      eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID3] = (payload_ptr[2] & 0x3F);
      LOG_D(MAC, "[eNB] MAC CE_LCID %d: Received long BSR LCGID0 = %u LCGID1 = "
                 "%u LCGID2 = %u LCGID3 = %u\n",
            rx_ces[i],
            eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID0],
            eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID1],
            eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID2],
            eNB_mac_inst[Mod_id].UE_template[UE_id].bsr_info[LCGID3]);
      break;
    default:
      LOG_E(MAC, "[eNB] Received unknown MAC header (0x%02x)\n", rx_ces[i]);
      break;
    }
  }

  for (i=0;i<num_sdu;i++) {
    LOG_D(MAC,"SDU Number %d MAC Subheader SDU_LCID %d, length %d\n",i,rx_lcids[i],rx_lengths[i]);
   
    if ((rx_lcids[i] == DCCH)||(rx_lcids[i] == DCCH1)) {
      //      if(eNB_mac_inst[Mod_id].Dcch_lchan[UE_id].Active==1){

#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
      LOG_T(MAC,"offset: %d\n",(unsigned char)((unsigned char*)payload_ptr-sdu));
      for (j=0;j<32;j++)
        LOG_T(MAC,"%x ",payload_ptr[j]);
      LOG_T(MAC,"\n");
#endif

      //  This check is just to make sure we didn't get a bogus SDU length, to be removed ...
      if (rx_lengths[i]<CCCH_PAYLOAD_SIZE_MAX) {
	LOG_D(MAC,"[eNB %d] Frame %d : ULSCH -> UL-DCCH, received %d bytes form UE %d on LCID %d(%d) \n",
	      Mod_id,frame, rx_lengths[i], UE_id, rx_lcids[i], rx_lcids[i]+(UE_id*NB_RB_MAX));

	mac_rlc_data_ind(Mod_id,frame,1,RLC_MBMS_NO,
			 rx_lcids[i]+(UE_id*NB_RB_MAX),
			 (char *)payload_ptr,
			 rx_lengths[i],
			 1,
			 NULL);//(unsigned int*)crc_status);
	eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].num_pdu_rx[rx_lcids[i]]+=1;
	eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].num_bytes_rx[rx_lcids[i]]+=rx_lengths[i];

      }
      //      }
    } else if (rx_lcids[i] >= DTCH) {
      //      if(eNB_mac_inst[Mod_id].Dcch_lchan[UE_id].Active==1){

#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
      LOG_T(MAC,"offset: %d\n",(unsigned char)((unsigned char*)payload_ptr-sdu));
     
      for (j=0;j<32;j++)
        LOG_T(MAC,"%x ",payload_ptr[j]);
      LOG_T(MAC,"\n"); 
#endif

      LOG_D(MAC,"[eNB %d] Frame %d : ULSCH -> UL-DTCH, received %d bytes from UE %d for lcid %d (%d)\n",
	    Mod_id,frame, rx_lengths[i], UE_id,rx_lcids[i],rx_lcids[i]+(UE_id*NB_RB_MAX));

      if ((rx_lengths[i] <SCH_PAYLOAD_SIZE_MAX) &&  (rx_lengths[i] > 0) ) {   // MAX SIZE OF transport block
	mac_rlc_data_ind(Mod_id,frame,1,RLC_MBMS_NO,
			 DTCH+(UE_id*NB_RB_MAX),
			 (char *)payload_ptr,
			 rx_lengths[i],
			 1,
			 NULL);//(unsigned int*)crc_status);
	eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].num_pdu_rx[rx_lcids[i]]+=1;
	eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].num_bytes_rx[rx_lcids[i]]+=rx_lengths[i];
	
      }
      //      }
    } else {
      eNB_mac_inst[Mod_id].eNB_UE_stats[UE_id].num_errors_rx+=1;
      LOG_E(MAC,"[eNB %d] received unknown LCID %d from UE %d ", rx_lcids[i], UE_id);
    }
    
    payload_ptr+=rx_lengths[i];
  }

  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_RX_SDU,0);

}

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) {

  SCH_SUBHEADER_FIXED *mac_header_ptr = (SCH_SUBHEADER_FIXED *)mac_header;
  u8 first_element=0,last_size=0,i;
  u8 mac_header_control_elements[16],*ce_ptr;

  ce_ptr = &mac_header_control_elements[0];

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

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

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

  if (ue_cont_res_id) {
    if (first_element>0) {
      mac_header_ptr->E = 1;
      /*   
      printf("[eNB][MAC] last subheader : %x (R%d,E%d,LCID%d)\n",*(unsigned char*)mac_header_ptr,
	     ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->R,
	     ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E,
	     ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID);
      */
      mac_header_ptr++;
    }
    else {
      first_element=1;
    }

    mac_header_ptr->R = 0;
    mac_header_ptr->E    = 0;
    mac_header_ptr->LCID = UE_CONT_RES;
    last_size=1;
    
    LOG_T(MAC,"[eNB ][RAPROC] Generate contention resolution msg: %x.%x.%x.%x.%x.%x\n",
	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]);
    
    memcpy(ce_ptr,ue_cont_res_id,6);
    ce_ptr+=6;
    // msg("(cont_res) : offset %d\n",ce_ptr-mac_header_control_elements);
  }

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

  for (i=0;i<num_sdus;i++) {
    LOG_T(MAC,"[eNB] Generate DLSCH header num sdu %d len sdu %d\n",num_sdus, sdu_lengths[i]);

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

  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));
    }
  */
  if (post_padding>0) {// we have lots of padding at the end of the packet
    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++;
  }
  else { // no end of packet padding
    // last SDU subhead is of fixed type (sdu length implicitly to be computed at UE)
    mac_header_ptr++;
  }

//msg("After subheaders %d\n",(u8*)mac_header_ptr - mac_header);
  
  if ((ce_ptr-mac_header_control_elements) > 0) {
    // 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);
  }
//msg("After CEs %d\n",(u8*)mac_header_ptr - mac_header);

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

}

/*
#ifdef Rel10
unsigned char generate_mch_header( unsigned char *mac_header,
				   unsigned char num_sdus,
				   unsigned short *sdu_lengths,
				   unsigned char *sdu_lcids,
				   unsigned char msi,
				   unsigned char short_padding,
				   unsigned short post_padding) {

  SCH_SUBHEADER_FIXED *mac_header_ptr = (SCH_SUBHEADER_FIXED *)mac_header;
  u8 first_element=0,last_size=0,i;
  u8 mac_header_control_elements[2*num_sdus],*ce_ptr;

  ce_ptr = &mac_header_control_elements[0];

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

  // SUBHEADER for MSI CE
  if (msi != 0) {// there is MSI MAC Control Element
    if (first_element>0) {
      mac_header_ptr->E = 1;
      mac_header_ptr+=last_size;
    }
    else {
      first_element = 1;
    }
    if (num_sdus*2 < 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 = MCH_SCHDL_INFO;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L    = num_sdus*2;
      last_size=2;
    }
    else {
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->R    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->E    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F    = 1;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->LCID = MCH_SCHDL_INFO;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L    = (num_sdus*2)&0x7fff;
      last_size=3;
    }
    // Create the MSI MAC Control Element here
  }
 
  // SUBHEADER for MAC SDU (MCCH+MTCHs)
  for (i=0;i<num_sdus;i++) {
    if (first_element>0) {
      mac_header_ptr->E = 1;
      mac_header_ptr+=last_size;
    }
    else {
      first_element = 1;
    }
    if (sdu_lengths[i] < 128) {
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->E    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F    = 0;
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->LCID = sdu_lcids[i];
      ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L    = (unsigned char)sdu_lengths[i];
      last_size=2;
    }
    else {
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->R    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->E    = 0;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F    = 1;
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->LCID = sdu_lcids[i];
      ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L    = (unsigned short) sdu_lengths[i]&0x7fff;
      last_size=3;
    }
  }

  if (post_padding>0) {// we have lots of padding at the end of the packet
    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++;
  }
  else { // no end of packet padding
    // last SDU subhead is of fixed type (sdu length implicitly to be computed at UE)
    mac_header_ptr++;
  }

  // Copy MSI Control Element to the end of the MAC Header if it presents
  if ((ce_ptr-mac_header_control_elements) > 0) {
    // 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);
  }

  return((unsigned char*)mac_header_ptr - mac_header);
}
#endif
*/
void add_common_dci(DCI_PDU *DCI_pdu,
		    void *pdu,
		    u16 rnti,
		    unsigned char dci_size_bytes,
		    unsigned char aggregation,
		    unsigned char dci_size_bits,
		    unsigned char dci_fmt,
		    u8 ra_flag) {

  memcpy(&DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].dci_pdu[0],pdu,dci_size_bytes);
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].dci_length = dci_size_bits;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].L          = aggregation;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].rnti       = rnti;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].format     = dci_fmt;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci].ra_flag    = ra_flag;


  DCI_pdu->Num_common_dci++;
}

void add_ue_spec_dci(DCI_PDU *DCI_pdu,void *pdu,u16 rnti,unsigned char dci_size_bytes,unsigned char aggregation,unsigned char dci_size_bits,unsigned char dci_fmt,u8 ra_flag) {

  memcpy(&DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].dci_pdu[0],pdu,dci_size_bytes);
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].dci_length = dci_size_bits;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].L          = aggregation;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].rnti       = rnti;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].format     = dci_fmt;
  DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci].ra_flag    = ra_flag;

  DCI_pdu->Num_ue_spec_dci++;
}

void schedule_SI(unsigned char Mod_id,u32 frame, unsigned char *nprb,unsigned int *nCCE) {

  unsigned char bcch_sdu_length;

  bcch_sdu_length = mac_rrc_data_req(Mod_id,
				     frame,
				     BCCH,1,
				     (char*)&eNB_mac_inst[Mod_id].BCCH_pdu.payload[0],
				     1,
				     Mod_id);
  if (bcch_sdu_length > 0) {
    LOG_D(MAC,"[eNB %d] Frame %d : BCCH->DLSCH, Received %d bytes \n",Mod_id,frame,bcch_sdu_length);

    if (mac_xface->lte_frame_parms->frame_type == TDD) {
      if (bcch_sdu_length <= (mac_xface->get_TBS_DL(0,3)))
	BCCH_alloc_pdu.mcs=0;
      else if (bcch_sdu_length <= (mac_xface->get_TBS_DL(1,3)))
	BCCH_alloc_pdu.mcs=1;
      else if (bcch_sdu_length <= (mac_xface->get_TBS_DL(2,3)))
	BCCH_alloc_pdu.mcs=2;
      else if (bcch_sdu_length <= (mac_xface->get_TBS_DL(3,3)))
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