eNB_scheduler_ulsch.c 63.3 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
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    OpenAirInterface is distributed in the hope that it will be useful,
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    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
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  OpenAirInterface Admin: openair_admin@eurecom.fr
  OpenAirInterface Tech : openair_tech@eurecom.fr
  OpenAirInterface Dev  : openair4g-devel@eurecom.fr

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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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 *******************************************************************************/
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/*! \file eNB_scheduler_ulsch.c
 * \brief eNB procedures for the ULSCH transport channel
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 * \author Navid Nikaein and Raymond Knopp
 * \date 2010 - 2014
 * \email: navid.nikaein@eurecom.fr
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 * \version 1.0
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 * @ingroup _mac

 */

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

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

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

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

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

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

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#define ENABLE_MAC_PAYLOAD_DEBUG 
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#define DEBUG_eNB_SCHEDULER 1

// This table holds the allowable PRB sizes for ULSCH transmissions
uint8_t rb_table[33] = {1,2,3,4,5,6,8,9,10,12,15,16,18,20,24,25,27,30,32,36,40,45,48,50,54,60,72,75,80,81,90,96,100};

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void rx_sdu(module_id_t enb_mod_idP,int CC_idP,frame_t frameP,rnti_t rntiP,uint8_t *sduP, uint16_t sdu_lenP,int harq_pidP,uint8_t *msg3_flagP) {
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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];
    int    UE_id = find_UE_id(enb_mod_idP,rntiP);
    int ii,j;
    eNB_MAC_INST *eNB = &eNB_mac_inst[enb_mod_idP];
    UE_list_t *UE_list= &eNB->UE_list;

    start_meas(&eNB->rx_ulsch_sdu);

    if ((UE_id >  NUMBER_OF_UE_MAX) || (UE_id == -1)  )
        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);

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

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

        switch (rx_ces[i]) { // implement and process BSR + CRNTI +
            case POWER_HEADROOM:
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                if (UE_id != -1){
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                    UE_list->UE_template[CC_idP][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], UE_list->UE_template[CC_idP][UE_id].phr_info);
                    UE_list->UE_template[CC_idP][UE_id].phr_info_configured=1;
                }
                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: {
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                if (UE_id  != -1){
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                    uint8_t 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);
                    UE_list->UE_template[CC_idP][UE_id].bsr_info[lcgid] = (payload_ptr[0] & 0x3f);
                    if (UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[lcgid] == 0 )
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[lcgid]=frameP;
                }
                payload_ptr += 1;//sizeof(SHORT_BSR); // fixme
            } break;
            case LONG_BSR:
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                if (UE_id  != -1){
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                    UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID0] = ((payload_ptr[0] & 0xFC) >> 2);
                    UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID1] =
                                    ((payload_ptr[0] & 0x03) << 4) | ((payload_ptr[1] & 0xF0) >> 4);
                    UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID2] =
                                    ((payload_ptr[1] & 0x0F) << 2) | ((payload_ptr[2] & 0xC0) >> 6);
                    UE_list->UE_template[CC_idP][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],
                          UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID0],
                          UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID1],
                          UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID2],
                          UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID3]);

                    if (UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID0] == 0 )
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID0]=0;
                    else if (UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID0] == 0)
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID0]=frameP;

                    if (UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID1] == 0 )
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID1]=0;
                    else if (UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID1] == 0)
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID1]=frameP;

                    if (UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID2] == 0 )
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID2]=0;
                    else if (UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID2] == 0)
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID2]=frameP;

                    if (UE_list->UE_template[CC_idP][UE_id].bsr_info[LCGID3] == 0 )
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID3]= 0;
                    else if (UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID3] == 0)
                        UE_list->UE_template[CC_idP][UE_id].ul_buffer_creation_time[LCGID3]=frameP;

                }
                payload_ptr += 3;////sizeof(LONG_BSR);
                break;
            default:
                LOG_E(MAC, "[eNB] Received unknown MAC header (0x%02x)\n", rx_ces[i]);
                break;
        }
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    }
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    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]);

        switch (rx_lcids[i]) {
            case CCCH :
                LOG_I(MAC,"[eNB %d][RAPROC] Frame %d, Received CCCH:  %x.%x.%x.%x.%x.%x, Terminating RA procedure for UE rnti %x\n",
                      enb_mod_idP,frameP,
                      payload_ptr[0],payload_ptr[1],payload_ptr[2],payload_ptr[3],payload_ptr[4], payload_ptr[5], rntiP);

                for (ii=0;ii<NB_RA_PROC_MAX;ii++) {
                    LOG_D(MAC,"[RAPROC] Checking proc %d : rnti (%x, %x), active %d\n",ii,
                          eNB->common_channels[CC_idP].RA_template[ii].rnti, rntiP,
                          eNB->common_channels[CC_idP].RA_template[ii].RA_active);

                    if ((eNB->common_channels[CC_idP].RA_template[ii].rnti==rntiP) &&
                                    (eNB->common_channels[CC_idP].RA_template[ii].RA_active==TRUE)) {

                        //payload_ptr = parse_ulsch_header(msg3,&num_ce,&num_sdu,rx_ces,rx_lcids,rx_lengths,msg3_len);

                        if (UE_id < 0) {
                            memcpy(&eNB->common_channels[CC_idP].RA_template[ii].cont_res_id[0],payload_ptr,6);
                            LOG_I(MAC,"[eNB %d][RAPROC] Frame %d CCCH: Received RRCConnectionRequest: length %d, offset %d\n",
                                  enb_mod_idP,frameP,rx_lengths[ii],payload_ptr-sduP);
                            if ((UE_id=add_new_ue(enb_mod_idP,CC_idP,eNB->common_channels[CC_idP].RA_template[ii].rnti,harq_pidP)) == -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",
                                      enb_mod_idP,frameP,eNB->common_channels[CC_idP].RA_template[ii].rnti,UE_id);
                        } else {
                            LOG_I(MAC,"[eNB %d][RAPROC] Frame %d CCCH: Received RRCConnectionReestablishment from UE %d: length %d, offset %d\n",
                                  enb_mod_idP,frameP,UE_id,rx_lengths[ii],payload_ptr-sduP);
                        }

                        if (Is_rrc_registered == 1)
                            mac_rrc_data_ind(enb_mod_idP,frameP,CCCH,(uint8_t *)payload_ptr,rx_lengths[ii],1,enb_mod_idP,0);


                        if (num_ce >0) {  // handle msg3 which is not RRCConnectionRequest
                            //	process_ra_message(msg3,num_ce,rx_lcids,rx_ces);
                        }

                        eNB->common_channels[CC_idP].RA_template[ii].generate_Msg4 = 1;
                        eNB->common_channels[CC_idP].RA_template[ii].wait_ack_Msg4 = 0;


                    } // if process is active

                } // loop on RA processes

                break;
            case  DCCH :
            case DCCH1 :
                //      if(eNB_mac_inst[module_idP][CC_idP].Dcch_lchan[UE_id].Active==1){

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#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
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                LOG_T(MAC,"offset: %d\n",(unsigned char)((unsigned char*)payload_ptr-sduP));
                for (j=0;j<32;j++)
                    LOG_T(MAC,"%x ",payload_ptr[j]);
                LOG_T(MAC,"\n");
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#endif
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                //  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 \n",
                          enb_mod_idP,frameP, rx_lengths[i], UE_id, rx_lcids[i]);

                    mac_rlc_data_ind(enb_mod_idP,UE_id, frameP,ENB_FLAG_YES,MBMS_FLAG_NO,
                                     rx_lcids[i],
                                     (char *)payload_ptr,
                                     rx_lengths[i],
                                     1,
                                     NULL);//(unsigned int*)crc_status);
                    UE_list->eNB_UE_stats[CC_idP][UE_id].num_pdu_rx[rx_lcids[i]]+=1;
                    UE_list->eNB_UE_stats[CC_idP][UE_id].num_bytes_rx[rx_lcids[i]]+=rx_lengths[i];

                }
                //      }
                break;
            case DTCH: // default DRB
                //      if(eNB_mac_inst[module_idP][CC_idP].Dcch_lchan[UE_id].Active==1){

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#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
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                LOG_T(MAC,"offset: %d\n",(unsigned char)((unsigned char*)payload_ptr-sduP));
                for (j=0;j<32;j++)
                    LOG_T(MAC,"%x ",payload_ptr[j]);
                LOG_T(MAC,"\n");
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#endif
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                LOG_D(MAC,"[eNB %d] Frame %d : ULSCH -> UL-DTCH, received %d bytes from UE %d for lcid %d\n",
                      enb_mod_idP,frameP, rx_lengths[i], UE_id,rx_lcids[i]);

                if ((rx_lengths[i] <SCH_PAYLOAD_SIZE_MAX) &&  (rx_lengths[i] > 0) ) {   // MAX SIZE OF transport block
                    mac_rlc_data_ind(enb_mod_idP,UE_id, frameP,ENB_FLAG_YES,MBMS_FLAG_NO,
                                     DTCH,
                                     (char *)payload_ptr,
                                     rx_lengths[i],
                                     1,
                                     NULL);//(unsigned int*)crc_status);
                    UE_list->eNB_UE_stats[CC_idP][UE_id].num_pdu_rx[rx_lcids[i]]+=1;
                    UE_list->eNB_UE_stats[CC_idP][UE_id].num_bytes_rx[rx_lcids[i]]+=rx_lengths[i];
                }
                //      }
                break;
            default :  //if (rx_lcids[i] >= DTCH) {
                UE_list->eNB_UE_stats[CC_idP][UE_id].num_errors_rx+=1;
                LOG_E(MAC,"[eNB %d] Frame %d : received unsupported or unknown LCID %d from UE %d ", enb_mod_idP, frameP, rx_lcids[i], UE_id);
                break;
        }
        payload_ptr+=rx_lengths[i];

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    }
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    /* NN--> FK: we could either check the payload, or use a phy helper to detect a false msg3 */
    if ((num_sdu == 0) && (num_ce==0)){
        UE_list->eNB_UE_stats[CC_idP][UE_id].total_num_errors_rx+=1;
        if (msg3_flagP != NULL){
            if( *msg3_flagP == 1 ) {
                LOG_N(MAC,"[eNB %d] frame %d : false msg3 detection: signal phy to canceling RA and remove the UE\n", enb_mod_idP, frameP);
                *msg3_flagP=0;
            }
        }
    }else {
        UE_list->eNB_UE_stats[CC_idP][UE_id].total_pdu_bytes_rx+=sdu_lenP;
        UE_list->eNB_UE_stats[CC_idP][UE_id].total_num_pdus_rx+=1;
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    }
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    vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_RX_SDU,0);
    stop_meas(&eNB->rx_ulsch_sdu);
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}


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uint32_t bytes_to_bsr_index(int32_t nbytes) {

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    uint32_t i=0;
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    if (nbytes<0)
        return(0);
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    while ((i<BSR_TABLE_SIZE)&&
                    (BSR_TABLE[i]<=nbytes)){
        i++;
    }
    return(i-1);
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}

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void adjust_bsr_info(int buffer_occupancy, 
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                     uint16_t TBS,
                     UE_TEMPLATE *UE_template){

    uint32_t         tmp_bsr;

    // could not serve all the uplink traffic
    if (buffer_occupancy > 0 ) {
        if (BSR_TABLE[UE_template->bsr_info[LCGID0]] <=  TBS ) {
            tmp_bsr = BSR_TABLE[UE_template->bsr_info[LCGID0]]; // serving this amout of  bytes
            UE_template->bsr_info[LCGID0] = 0;
            if (BSR_TABLE[UE_template->bsr_info[LCGID1]] <= (TBS-tmp_bsr)) {
                tmp_bsr += BSR_TABLE[UE_template->bsr_info[LCGID1]];
                UE_template->bsr_info[LCGID1] = 0;
                if (BSR_TABLE[UE_template->bsr_info[LCGID2]] <= (TBS-tmp_bsr)) {
                    tmp_bsr += BSR_TABLE[UE_template->bsr_info[LCGID2]];
                    UE_template->bsr_info[LCGID2] = 0;
                    if (BSR_TABLE[UE_template->bsr_info[LCGID3]] <= (TBS-tmp_bsr)) {
                        tmp_bsr += BSR_TABLE[UE_template->bsr_info[LCGID3]];
                        UE_template->bsr_info[LCGID3] = 0;
                    } else {
                        UE_template->bsr_info[LCGID3] = bytes_to_bsr_index((int32_t)BSR_TABLE[UE_template->bsr_info[LCGID3]] - ((int32_t) TBS - (int32_t)tmp_bsr));
                    }
                }
                else {
                    UE_template->bsr_info[LCGID2] = bytes_to_bsr_index((int32_t)BSR_TABLE[UE_template->bsr_info[LCGID2]] - ((int32_t)TBS - (int32_t)tmp_bsr));
                }
            }
            else {
                UE_template->bsr_info[LCGID1] = bytes_to_bsr_index((int32_t)BSR_TABLE[UE_template->bsr_info[LCGID1]] - ((int32_t)TBS - (int32_t)tmp_bsr));
            }
        }
        else {
            UE_template->bsr_info[LCGID0] = bytes_to_bsr_index((int32_t)BSR_TABLE[UE_template->bsr_info[LCGID0]] - (int32_t)TBS);
        }
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    }
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    else {  // we have flushed all buffers so clear bsr
        UE_template->bsr_info[LCGID0] = 0;
        UE_template->bsr_info[LCGID1] = 0;
        UE_template->bsr_info[LCGID2] = 0;
        UE_template->bsr_info[LCGID3] = 0;
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    }


}
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void add_ue_ulsch_info(module_id_t module_idP, int CC_id, int UE_id, sub_frame_t subframeP, UE_ULSCH_STATUS status){
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    eNB_ulsch_info[module_idP][CC_id][UE_id].rnti             = UE_RNTI(module_idP,UE_id);
    eNB_ulsch_info[module_idP][CC_id][UE_id].subframe         = subframeP;
    eNB_ulsch_info[module_idP][CC_id][UE_id].status           = status;
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    eNB_ulsch_info[module_idP][CC_id][UE_id].serving_num++;
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}

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// This seems not to be used anymore
/*
int schedule_next_ulue(module_id_t module_idP, int UE_id, sub_frame_t subframeP){
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  int next_ue;
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  // first phase: scheduling for ACK
  switch (subframeP) {
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    // scheduling for subframeP 2: for scheduled user during subframeP 5 and 6
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  case 8:
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    if  ((eNB_dlsch_info[module_idP][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[module_idP][UE_id].subframe == 5 || eNB_dlsch_info[module_idP][UE_id].subframe == 6)){
      // set the downlink status
      eNB_dlsch_info[module_idP][UE_id].status = S_DL_BUFFERED;
      return UE_id;
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    }
    break;
    // scheduling for subframeP 3: for scheduled user during subframeP 7 and 8
  case 9:
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    if  ((eNB_dlsch_info[module_idP][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[module_idP][UE_id].subframe == 7 || eNB_dlsch_info[module_idP][UE_id].subframe == 8)){
      eNB_dlsch_info[module_idP][UE_id].status = S_DL_BUFFERED;
      return UE_id;
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    }
    break;
    // scheduling UL subframeP 4: for scheduled user during subframeP 9 and 0
  case 0 :
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    if  ((eNB_dlsch_info[module_idP][UE_id].status == S_DL_SCHEDULED) &&
	 (eNB_dlsch_info[module_idP][UE_id].subframe == 9 || eNB_dlsch_info[module_idP][UE_id].subframe == 0)){
      eNB_dlsch_info[module_idP][UE_id].status = S_DL_BUFFERED;
      return UE_id;
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    }
    break;
  default:
    break;
  }

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

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

}
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 */
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unsigned char *parse_ulsch_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) {

    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+=3;
                else if (lcid==CRNTI)
                    ce_len+=2;
                else if ((lcid==POWER_HEADROOM) || (lcid==TRUNCATED_BSR)|| (lcid== SHORT_BSR))
                    ce_len++;
                else {
                    LOG_E(MAC,"unknown CE %d \n", lcid);
                    mac_xface->macphy_exit("unknown CE");
                }
            }
        }
486
    }
487 488
    *num_ce = num_ces;
    *num_sdu = num_sdus;
489

490
    return(mac_header_ptr);
491 492 493
}


494
void schedule_ulsch(module_id_t module_idP, frame_t frameP,unsigned char cooperation_flag,sub_frame_t subframeP, unsigned char sched_subframe,
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                    unsigned int *nCCE) {//,int calibration_flag) {


    unsigned int nCCE_available[MAX_NUM_CCs];
    uint16_t first_rb[MAX_NUM_CCs],i;
    int CC_id;
    eNB_MAC_INST *eNB=&eNB_mac_inst[module_idP];

    start_meas(&eNB->schedule_ulsch);


    for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {

        first_rb[CC_id] = 1;
        nCCE_available[CC_id] = mac_xface->get_nCCE_max(module_idP,CC_id) - nCCE[CC_id];

        // UE data info;
        // check which UE has data to transmit
        // function to decide the scheduling
        // e.g. scheduling_rslt = Greedy(granted_UEs, nb_RB)

        // default function for default scheduling
        //

        // output of scheduling, the UE numbers in RBs, where it is in the code???
        // check if RA (Msg3) is active in this subframeP, if so skip the PRBs used for Msg3
        // Msg3 is using 1 PRB so we need to increase first_rb accordingly
        // not sure about the break (can there be more than 1 active RA procedure?)

        for (i=0;i<NB_RA_PROC_MAX;i++) {
            if ((eNB->common_channels[CC_id].RA_template[i].RA_active == TRUE) &&
                            (eNB->common_channels[CC_id].RA_template[i].generate_rar == 0) &&
                            (eNB->common_channels[CC_id].RA_template[i].Msg3_subframe == sched_subframe)) {
                first_rb[CC_id]++;
                break;
            }
        }
532
    }
533

534 535
    schedule_ulsch_rnti(module_idP, cooperation_flag, frameP, subframeP, sched_subframe, nCCE, nCCE_available, first_rb);

536
#ifdef CBA
537
    schedule_ulsch_cba_rnti(module_idP, cooperation_flag, frameP, subframeP, sched_subframe, nCCE, nCCE_available, first_rb);
538 539
#endif

540

541 542
    stop_meas(&eNB->schedule_ulsch);

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}



void schedule_ulsch_rnti(module_id_t   module_idP,
                         unsigned char cooperation_flag,
                         frame_t       frameP,
                         sub_frame_t   subframeP,
                         unsigned char sched_subframe,
                         unsigned int *nCCE,
                         unsigned int *nCCE_available,
554
                         uint16_t     *first_rb){
555

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    int                UE_id;
    uint8_t            aggregation    = 2;
    rnti_t             rnti           = -1;
    uint8_t            round          = 0;
    uint8_t            harq_pid       = 0;
    void              *ULSCH_dci      = NULL;
    LTE_eNB_UE_stats  *eNB_UE_stats   = NULL;
    DCI_PDU           *DCI_pdu;
    uint8_t                 status         = 0;
    uint8_t                 rb_table_index = -1;
    uint16_t                TBS,i;
    int32_t                buffer_occupancy=0;
    uint32_t                cqi_req,cshift,ndi,mcs,rballoc,tpc;
    int32_t                 normalized_rx_power, target_rx_power=-90;
    static int32_t          tpc_accumulated=0;

    int n,CC_id;
    eNB_MAC_INST      *eNB=&eNB_mac_inst[module_idP];
    UE_list_t         *UE_list=&eNB->UE_list;
    UE_TEMPLATE       *UE_template;
    int                rvidx_tab[4] = {0,2,3,1};
    LTE_DL_FRAME_PARMS   *frame_parms;


    //  LOG_I(MAC,"entering ulsch preprocesor\n");

    ulsch_scheduler_pre_processor(module_idP,
                                  frameP,
                                  subframeP,
                                  first_rb,
                                  aggregation,
                                  nCCE);

    //  LOG_I(MAC,"exiting ulsch preprocesor\n");

    // loop over all active UEs
    for (UE_id=UE_list->head_ul;UE_id>=0;UE_id=UE_list->next_ul[UE_id]) {

        // don't schedule if Msg4 is not received yet
        if (UE_list->UE_template[UE_PCCID(module_idP,UE_id)][UE_id].configured==FALSE)
            continue;

        rnti = UE_RNTI(module_idP,UE_id);
        if (rnti==0) {
            LOG_W(MAC,"[eNB %d] frame %d subfarme %d, UE %d CC %d: no RNTI \n", module_idP,frameP,subframeP,UE_id,CC_id);
            continue;
        }

        // loop over all active UL CC_ids for this UE
        for (n=0;n<UE_list->numactiveULCCs[UE_id];n++) {
            // This is the actual CC_id in the list
            CC_id = UE_list->ordered_ULCCids[n][UE_id];
            frame_parms = mac_xface->get_lte_frame_parms(module_idP,CC_id);
            eNB_UE_stats = mac_xface->get_eNB_UE_stats(module_idP,CC_id,rnti);
            if (eNB_UE_stats==NULL){
                LOG_W(MAC,"[eNB %d] frame %d subframe %d, UE %d CC %d: no PHY context\n", module_idP,frameP,subframeP,UE_id,CC_id);
                continue; // mac_xface->macphy_exit("[MAC][eNB] Cannot find eNB_UE_stats\n");
            }
            if (nCCE_available[CC_id] < (1<<aggregation)){
                LOG_W(MAC,"[eNB %d] frame %d subframe %d, UE %d CC %d: not enough nCCE (%d)\n", module_idP,frameP,subframeP,UE_id,CC_id,nCCE_available[CC_id]);
                continue; // break;
            }


            if (eNB_UE_stats->mode == PUSCH) { // ue has a ulsch channel

                DCI_pdu = &eNB->common_channels[CC_id].DCI_pdu;
                UE_template = &UE_list->UE_template[CC_id][UE_id];

                if (mac_xface->get_ue_active_harq_pid(module_idP,CC_id,rnti,frameP,subframeP,&harq_pid,&round,1) == -1 ){
                    LOG_W(MAC,"[eNB %d] Scheduler Frame %d, subframeP: candidate harq_pid from PHY for UE %d CC %d RNTI %x\n",
                          module_idP,frameP,subframeP, UE_id, CC_id, rnti);
                    //  NN --> RK: Don't schedule UE if we cannot get harq pid
                    //should we continue or set harq_pid to 0?
                    continue;
                }else
                    LOG_T(MAC,"[eNB %d] Frame %d, subframeP %d, UE %d CC %d : got harq pid %d  round %d (nCCE %d, rnti %x,mode %s)\n",
                          module_idP,frameP,subframeP,UE_id,CC_id, harq_pid, round,nCCE[CC_id],rnti,mode_string[eNB_UE_stats->mode]);

635

636

637
#ifndef EXMIMO_IOT
638 639
                if (((UE_is_to_be_scheduled(module_idP,CC_id,UE_id)>0)) || (round>0) || ((frameP%10)==0))
                    // if there is information on bsr of DCCH, DTCH or if there is UL_SR, or if there is a packet to retransmit, or we want to schedule a periodic feedback every 10 frames
640
#else
641
                    if (round==0)
642
#endif
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                    {
                        // reset the scheduling request
                        UE_template->ul_SR = 0;
                        aggregation = process_ue_cqi(module_idP,UE_id); // =2 by default!!
                        status = mac_get_rrc_status(module_idP,1,UE_id);
                        cqi_req = (status < RRC_CONNECTED)? 0:1;

                        //power control
                        //compute the expected ULSCH RX power (for the stats)

                        // this is the normalized RX power and this should be constant (regardless of mcs
                        normalized_rx_power = eNB_UE_stats->UL_rssi[0];
                        target_rx_power = mac_xface->get_target_ul_rx_power(module_idP,CC_id);
                        // this assumes accumulated tpc
                        if (subframeP==0) {
                            if (normalized_rx_power>(target_rx_power+1)) {
                                tpc = 0; //-1
                                tpc_accumulated--;
                            }
                            else if (normalized_rx_power<(target_rx_power-1)) {
                                tpc = 2; //+1
                                tpc_accumulated++;
                            }
                            else
                                tpc = 1; //0
                        }
                        else
                            tpc = 1; //0

                        LOG_D(MAC,"[eNB %d] ULSCH scheduler: subframe %d, harq_pid %d, tpc %d, accumulated %d, normalized/target rx power %d/%d\n",module_idP,subframeP,harq_pid,tpc,tpc_accumulated,normalized_rx_power,target_rx_power);


                        // new transmission
                        if (round==0) {

                            ndi = 1-UE_template->oldNDI_UL[harq_pid];
                            UE_template->oldNDI_UL[harq_pid]=ndi;
                            //mcs = 10;
                            UE_list->eNB_UE_stats[CC_id][UE_id].ulsch_mcs2=UE_template->pre_assigned_mcs_ul;
                            mcs = cmin (UE_template->pre_assigned_mcs_ul, openair_daq_vars.target_ue_ul_mcs); // adjust, based on user-defined MCS
                            if (UE_template->pre_allocated_rb_table_index_ul >=0)
                                rb_table_index=UE_template->pre_allocated_rb_table_index_ul;
                            else {
                                mcs=10;rb_table_index=5; // for PHR
                            }
                            UE_list->eNB_UE_stats[CC_id][UE_id].ulsch_mcs2=mcs;
                            buffer_occupancy = UE_template->ul_total_buffer;

                            while ((rb_table[rb_table_index]>(frame_parms->N_RB_UL-1-first_rb[CC_id])) &&
                                            (rb_table_index>0)) {
                                rb_table_index--;
                            }
                            TBS = mac_xface->get_TBS_UL(mcs,rb_table[rb_table_index]);
                            buffer_occupancy -= TBS;
                            rballoc = mac_xface->computeRIV(frame_parms->N_RB_UL,
                                                            first_rb[CC_id],
                                                            rb_table[rb_table_index]);
                            // increment for next UE allocation
                            first_rb[CC_id]+=rb_table[rb_table_index];
                            //store for possible retransmission
                            UE_template->nb_rb_ul[harq_pid] = rb_table[rb_table_index];

                            LOG_D(MAC,"[eNB %d][PUSCH %d/%x] Frame %d subframeP %d Scheduled UE %d (mcs %d, first rb %d, nb_rb %d, rb_table_index %d, TBS %d, harq_pid %d)\n",
                                  module_idP,harq_pid,rnti,frameP,subframeP,UE_id,mcs,
                                  first_rb[CC_id],rb_table[rb_table_index],
                                  rb_table_index,TBS,harq_pid);
                            // Adjust BSR entries for LCGIDs
                            adjust_bsr_info(buffer_occupancy,
                                            TBS,
                                            UE_template);

                        }
                        else if (round > 0) { //we schedule a retransmission

                            ndi = UE_template->oldNDI_UL[harq_pid];
                            if ((round&3)==0)
                                mcs = openair_daq_vars.target_ue_ul_mcs;
                            else
                                mcs = rvidx_tab[round&3] + 28; //not correct for round==4!


                            LOG_D(MAC,"[eNB %d][PUSCH %d/%x] Frame %d subframeP %d Scheduled UE retransmission (mcs %d, first rb %d, nb_rb %d, TBS %d, harq_pid %d, round %d)\n",
                                  module_idP,UE_id,rnti,frameP,subframeP,mcs,
                                  first_rb[CC_id],UE_template->nb_rb_ul[harq_pid],
                                  TBS,//mac_xface->get_TBS_UL(mcs,UE_template->nb_rb_ul[harq_pid]),
                                  harq_pid, round);

                            rballoc = mac_xface->computeRIV(frame_parms->N_RB_UL,
                                                            first_rb[CC_id],
                                                            UE_template->nb_rb_ul[harq_pid]);
                            first_rb[CC_id]+=UE_template->nb_rb_ul[harq_pid];  // increment for next UE allocation
                        }

                        // Cyclic shift for DM RS
                        if(cooperation_flag == 2) {
                            if(UE_id == 1)// For Distriibuted Alamouti, cyclic shift applied to 2nd UE
                                cshift = 1;
                            else
                                cshift = 0;
                        }
                        else
                            cshift = 0;// values from 0 to 7 can be used for mapping the cyclic shift (36.211 , Table 5.5.2.1.1-1)

                        if (frame_parms->frame_type == TDD) {
                            switch (frame_parms->N_RB_UL) {
                                case 6:
                                    ULSCH_dci = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_template->DAI_ul[sched_subframe];
                                    ((DCI0_1_5MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_1_5MHz_TDD_1_6_t),
                                                    aggregation,
                                                    sizeof_DCI0_1_5MHz_TDD_1_6_t,
                                                    format0,
                                                    0);
                                    break;
                                default:
                                case 25:
                                    ULSCH_dci = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_template->DAI_ul[sched_subframe];
                                    ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_5MHz_TDD_1_6_t),
                                                    aggregation,
                                                    sizeof_DCI0_5MHz_TDD_1_6_t,
                                                    format0,
                                                    0);
                                    break;
                                case 50:
                                    ULSCH_dci = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_template->DAI_ul[sched_subframe];
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_10MHz_TDD_1_6_t),
                                                    aggregation,
                                                    sizeof_DCI0_10MHz_TDD_1_6_t,
                                                    format0,
                                                    0);
                                    break;
                                case 100:
                                    ULSCH_dci = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_template->DAI_ul[sched_subframe];
                                    ((DCI0_20MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_20MHz_TDD_1_6_t),
                                                    aggregation,
                                                    sizeof_DCI0_20MHz_TDD_1_6_t,
                                                    format0,
                                                    0);
                                    break;
                            }
                        } // TDD
                        else { //FDD
                            switch (frame_parms->N_RB_UL) {
                                case 25:
                                default:

                                    ULSCH_dci          = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_5MHz_FDD_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_5MHz_FDD_t),
                                                    aggregation,
                                                    sizeof_DCI0_5MHz_FDD_t,
                                                    format0,
                                                    0);
                                    break;
                                case 6:
                                    ULSCH_dci          = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_1_5MHz_FDD_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_1_5MHz_FDD_t),
                                                    aggregation,
                                                    sizeof_DCI0_1_5MHz_FDD_t,
                                                    format0,
                                                    0);
                                    break;
                                case 50:
                                    ULSCH_dci          = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_10MHz_FDD_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_10MHz_FDD_t),
                                                    aggregation,
                                                    sizeof_DCI0_10MHz_FDD_t,
                                                    format0,
                                                    0);
                                    break;
                                case 100:
                                    ULSCH_dci          = UE_template->ULSCH_DCI[harq_pid];

                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->mcs      = mcs;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->ndi      = ndi;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->TPC      = tpc;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->padding  = 0;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->cshift   = cshift;
                                    ((DCI0_20MHz_FDD_t *)ULSCH_dci)->cqi_req  = cqi_req;

                                    add_ue_spec_dci(DCI_pdu,
                                                    ULSCH_dci,
                                                    rnti,
                                                    sizeof(DCI0_20MHz_FDD_t),
                                                    aggregation,
                                                    sizeof_DCI0_20MHz_FDD_t,
                                                    format0,
                                                    0);
                                    break;

                            }
                        }

                        add_ue_ulsch_info(module_idP,
                                          CC_id,
                                          UE_id,
                                          subframeP,
                                          S_UL_SCHEDULED);

                        nCCE[CC_id] = nCCE[CC_id] + (1<<aggregation);
                        nCCE_available[CC_id] = mac_xface->get_nCCE_max(module_idP,CC_id) - nCCE[CC_id];

                        LOG_D(MAC,"[eNB %d] Frame %d, subframeP %d: Generated ULSCH DCI for next UE_id %d, format 0\n", module_idP,frameP,subframeP,UE_id);
949
#ifdef DEBUG
950
                        dump_dci(frame_parms, &DCI_pdu->dci_alloc[DCI_pdu->Num_common_dci+DCI_pdu->Num_ue_spec_dci-1]);
951
#endif
952 953 954 955 956

                    } // UE_is_to_be_scheduled
            } // UE is in PUSCH
        } // loop over UE_id
    } // loop of CC_id
957 958 959
}

#ifdef CBA
960
void schedule_ulsch_cba_rnti(module_id_t module_idP, unsigned char cooperation_flag, frame_t frameP, sub_frame_t subframeP, unsigned char sched_subframe, unsigned int *nCCE, unsigned int *nCCE_available, uint16_t *first_rb){
961

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
    eNB_MAC_INST *eNB = &eNB_mac_inst[module_idP];
    UE_list_t         *UE_list=&eNB->UE_list;
    //UE_TEMPLATE       *UE_template;
    void              *ULSCH_dci      = NULL;
    DCI_PDU *DCI_pdu;
    uint8_t CC_id=0;
    uint8_t rb_table_index=0, aggregation=2;
    uint32_t rballoc;
    uint8_t cba_group, cba_resources;
    uint8_t required_rbs[NUM_MAX_CBA_GROUP];
    int8_t num_cba_resources[NUM_MAX_CBA_GROUP];// , weight[NUM_MAX_CBA_GROUP]
    // the following vars should become a vector [MAX_NUM_CCs]
    LTE_DL_FRAME_PARMS   *frame_parms;
    int8_t available_rbs=0;
    uint8_t remaining_rbs=0;
    uint8_t allocated_rbs=0;
    uint8_t total_UEs=UE_list->num_UEs;
    uint8_t active_UEs[NUM_MAX_CBA_GROUP];
    uint8_t total_groups=eNB_mac_inst[module_idP].common_channels[CC_id].num_active_cba_groups;
    int     min_rb_unit=2;
    uint8_t cba_policy=CBA_ES;
    int     UE_id;
    uint8_t mcs[NUM_MAX_CBA_GROUP];
    uint32_t total_cba_resources=0;
    uint32_t total_rbs=0;
    // We compute the weight of each group and initialize some variables

    // loop over all active UEs
    //  for (UE_id=UE_list->head_ul;UE_id>=0;UE_id=UE_list->next_ul[UE_id]) {

    for (cba_group=0;cba_group<total_groups;cba_group++) {
        // UEs in PUSCH with traffic
        //    weight[cba_group] = 0;
        required_rbs[cba_group] = 0;
        num_cba_resources[cba_group]=0;
        active_UEs[cba_group]=0;
        mcs[cba_group]=openair_daq_vars.target_ue_ul_mcs;
    }
    //LOG_D(MAC, "[eNB ] CBA granted ues are %d\n",granted_UEs );

    for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {

        frame_parms=mac_xface->get_lte_frame_parms(module_idP,CC_id);
        available_rbs=frame_parms->N_RB_DL-1-first_rb[CC_id];
        remaining_rbs=available_rbs;
        total_groups=eNB_mac_inst[module_idP].common_channels[CC_id].num_active_cba_groups;
        min_rb_unit=get_min_rb_unit(module_idP,CC_id);

        if (available_rbs  < min_rb_unit )
            continue;

        // remove this condition later
        // cba group template uses the exisitng UE template, and thus if a UE
        // is scheduled, the correspodning group can't be used for CBA
        // this can be fixed later
        if ((total_groups > 0) && (nCCE[CC_id] == 0)) {
            DCI_pdu = &eNB_mac_inst[module_idP].common_channels[CC_id].DCI_pdu;

            for (cba_group=0;
                            (cba_group<total_groups)  && (nCCE_available[CC_id]* (total_cba_resources+1) > (1<<aggregation));
                            cba_group++) {
                // equal weight
                //weight[cba_group] = floor(total_UEs/active_groups);//find_num_active_UEs_in_cbagroup(module_idP, cba_group);

                for (UE_id=UE_list->head_ul;UE_id>=0;UE_id=UE_list->next_ul[UE_id]) {
                    if (UE_RNTI(module_idP,UE_id)==0)
                        continue;
                    // simple UE identity based grouping
                    if ((UE_id % total_groups) == cba_group){ // this could be simplifed to  active_UEs[UE_id % total_groups]++;
                        if ((mac_get_rrc_status(module_idP,1,UE_id) > RRC_CONNECTED) &&
                                        (UE_is_to_be_scheduled(module_idP,CC_id,UE_id) == 0))
                            active_UEs[cba_group]++;
                    }
                    if (UE_list->UE_template[CC_id][UE_id].pre_assigned_mcs_ul <= 2)
                        mcs[cba_group]= 8; // apply fixed scheduling
                    else if ((UE_id % total_groups) == cba_group)
                        mcs[cba_group]= cmin(mcs[cba_group],UE_list->UE_template[CC_id][UE_id].pre_assigned_mcs_ul);
                }
                mcs[cba_group]= cmin(mcs[cba_group],openair_daq_vars.target_ue_ul_mcs);

                if (available_rbs < min_rb_unit )
                    break;
                // If the group needs some resource
                // determine the total number of allocations (one or multiple DCIs): to be refined
                if ((active_UEs[cba_group] > 0) && (eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group] != 0)){
                    // to be refined in case of : total_UEs >> weight[cba_group]*available_rbs

                    switch(cba_policy) {
                        case CBA_ES:
                            required_rbs[cba_group] = (uint8_t)floor(available_rbs/total_groups); // allocate equally among groups
                            num_cba_resources[cba_group]=1;
                            break;
                            // can't have more than one allocation for the same group/UE
                            /*  case CBA_ES_S:
1056 1057 1058 1059
	    required_rbs[cba_group] = (uint8_t)floor(available_rbs/total_groups); // allocate equally among groups
	    if (required_rbs[cba_group] > min_rb_unit)
	      num_cba_resources[cba_group]=(uint8_t)(required_rbs[cba_group]/ min_rb_unit);
	      break;*/
1060 1061 1062 1063 1064
                        case CBA_PF:
                            required_rbs[cba_group] = (uint8_t)floor((active_UEs[cba_group]*available_rbs)/total_UEs);
                            num_cba_resources[cba_group]=1;
                            break;
                            /* case CBA_PF_S:
1065 1066 1067 1068
	    required_rbs[cba_group] = (uint8_t)ceil((active_UEs[cba_group]*available_rbs)/total_UEs);
	    if (required_rbs[cba_group] > min_rb_unit)
	      num_cba_resources[cba_group]=(uint8_t) floor(required_rbs[cba_group] / min_rb_unit);
	    break;*/
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                        default:
                            LOG_W(MAC,"unknown CBA policy\n");
                            break;
                    }
                    total_cba_resources+=num_cba_resources[cba_group];
                    total_rbs+=required_rbs[cba_group];

                    /*  while ((remaining_rbs < required_rbs[cba_group]) &&
1078 1079
		 (required_rbs[cba_group] > 0) && 
		 (required_rbs[cba_group] < min_rb_unit ))
1080
	    required_rbs[cba_group]--;
1081 1082 1083
                     */

                    /*
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	    while (rb_table[rb_table_index] < required_rbs[cba_group])
	    rb_table_index++;

	    while (rb_table[rb_table_index] > remaining_rbs )
	    rb_table_index--;

	    remaining_rbs-=rb_table[rb_table_index];
	    required_rbs[cba_group]=rb_table[rb_table_index];
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                     */
                    //	  num_cba_resources[cba_group]=1;

                }
            }
            // phase 2 reduce the number of cba allocations among the groups
            cba_group=0;
            while  (nCCE[CC_id] + (1<<aggregation) * total_cba_resources >= nCCE_available[CC_id]){
                num_cba_resources[cba_group%total_groups]--;
                total_cba_resources--;
                //	LOG_N(MAC,"reducing num cba resources to %d for group %d \n",	num_cba_resources[cba_group%total_groups], cba_group%total_groups );
                cba_group++;
            }

            if (total_cba_resources <= 0)
                return;

            // increase rb if any left: to be done
            cba_group=0;
            while (total_rbs  < available_rbs - 1 ){
                required_rbs[cba_group%total_groups]++;
                total_rbs++;
                cba_group++;
            }

            // phase 3:
            for (cba_group=0;cba_group<total_groups;cba_group++) {

                LOG_N(MAC,"[eNB %d] Frame %d, subframe %d: cba group %d active_ues %d total groups %d mcs %d, available/required rb (%d/%d), num resources %d, ncce (%d/%d required %d \n",
                      module_idP, frameP, subframeP, cba_group,active_UEs[cba_group],total_groups,
                      mcs[cba_group], available_rbs,required_rbs[cba_group],
                      num_cba_resources[cba_group],
                      nCCE[CC_id],nCCE_available[CC_id],(1<<aggregation) * num_cba_resources[cba_group]);

                for (cba_resources=0; cba_resources < num_cba_resources[cba_group]; cba_resources++){
                    rb_table_index =0;
                    // check if there was an allocation for this group in the 1st phase
                    if (required_rbs[cba_group] == 0 )
                        continue;

                    while (rb_table[rb_table_index] < (uint8_t) ceil(required_rbs[cba_group] / num_cba_resources[cba_group]) )
                        rb_table_index++;

                    while (rb_table[rb_table_index] > remaining_rbs )
                        rb_table_index--;

                    remaining_rbs-=rb_table[rb_table_index];
                    allocated_rbs=rb_table[rb_table_index];

                    rballoc = mac_xface->computeRIV(mac_xface->lte_frame_parms->N_RB_UL,
                                                    first_rb[CC_id],
                                                    rb_table[rb_table_index]);

                    first_rb[CC_id]+=rb_table[rb_table_index];
                    LOG_N(MAC,"[eNB %d] Frame %d, subframeP %d: schedule CBA access %d rnti %x, total/required/allocated/remaining rbs (%d/%d/%d/%d), mcs %d, rballoc %d, nCCE (%d/%d)\n",
                          module_idP, frameP, subframeP, cba_group,eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group],
                          available_rbs, required_rbs[cba_group], allocated_rbs, remaining_rbs,
                          mcs[cba_group],rballoc,nCCE_available[CC_id],nCCE[CC_id]);

                    switch (frame_parms->N_RB_UL) {
                        case 6:
                            mac_xface->macphy_exit("[MAC][eNB] CBA RB=6 not supported \n");
                            break;
                        case 25:
                            if (frame_parms->frame_type == TDD) {
                                ULSCH_dci = UE_list->UE_template[CC_id][cba_group].ULSCH_DCI[0];

                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs[cba_group];
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = 1;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = 1;//tpc;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cba_group;
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_list->UE_template[CC_id][cba_group].DAI_ul[sched_subframe];
                                ((DCI0_5MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = 1;

                                //add_ue_spec_dci
                                add_common_dci(DCI_pdu,
                                               ULSCH_dci,
                                               eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group],
                                               sizeof(DCI0_5MHz_TDD_1_6_t),
                                               aggregation,
                                               sizeof_DCI0_5MHz_TDD_1_6_t,
                                               format0,
                                               0);
                            }
                            else {
                                ULSCH_dci = UE_list->UE_template[CC_id][cba_group].ULSCH_DCI[0];

                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->mcs      = mcs[cba_group];
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->ndi      = 1;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->TPC      = 1;//tpc;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->cshift   = cba_group;
                                ((DCI0_5MHz_FDD_t *)ULSCH_dci)->cqi_req  = 1;

                                //add_ue_spec_dci
                                add_common_dci(DCI_pdu,
                                               ULSCH_dci,
                                               eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group],
                                               sizeof(DCI0_5MHz_FDD_t),
                                               aggregation,
                                               sizeof_DCI0_5MHz_FDD_t,
                                               format0,
                                               0);
                            }
                            LOG_D(MAC,"[eNB %d] Frame %d, subframeP %d: Generated ULSCH DCI for CBA group %d, RB 25 format 0\n", module_idP,frameP,subframeP,cba_group);
                            break;
                        case 50:
                            if (frame_parms->frame_type == TDD) {
                                ULSCH_dci = UE_list->UE_template[CC_id][cba_group].ULSCH_DCI[0];

                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->type     = 0;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->hopping  = 0;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->rballoc  = rballoc;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->mcs      = mcs[cba_group];
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->ndi      = 1;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->TPC      = 1;//tpc;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->cshift   = cba_group;
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->dai      = UE_list->UE_template[CC_id][cba_group].DAI_ul[sched_subframe];
                                ((DCI0_10MHz_TDD_1_6_t *)ULSCH_dci)->cqi_req  = 1;

                                //add_ue_spec_dci
                                add_common_dci(DCI_pdu,
                                               ULSCH_dci,
                                               eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group],
                                               sizeof(DCI0_10MHz_TDD_1_6_t),
                                               aggregation,
                                               sizeof_DCI0_10MHz_TDD_1_6_t,
                                               format0,
                                               0);
                            }
                            else {
                                ULSCH_dci = UE_list->UE_template[CC_id][cba_group].ULSCH_DCI[0];

                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->type     = 0;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->hopping  = 0;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->rballoc  = rballoc;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->mcs      = mcs[cba_group];
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->ndi      = 1;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->TPC      = 1;//tpc;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->cshift   = cba_group;
                                ((DCI0_10MHz_FDD_t *)ULSCH_dci)->cqi_req  = 1;

                                //add_ue_spec_dci
                                add_common_dci(DCI_pdu,
                                               ULSCH_dci,
                                               eNB_mac_inst[module_idP].common_channels[CC_id].cba_rnti[cba_group],
                                               sizeof(DCI0_10MHz_FDD_t),
                                               aggregation,
                                               sizeof_DCI0_10MHz_FDD_t,
                                               format0,
                                               0);
                            }
                            LOG_D(MAC,"[eNB %d] Frame %d, subframeP %d: Generated ULSCH DCI for CBA group %d, RB 50 format 0\n", module_idP,frameP,subframeP,cba_group);
                            break;
                        case 100:
                            mac_xface->macphy_exit("[MAC][eNB] CBA RB=100 not supported \n");
                            break;
                        default:
                            break;
                    }
                    nCCE[CC_id] = nCCE[CC_id] + (1<<aggregation) ;
                    nCCE_available[CC_id] = mac_xface->get_nCCE_max(module_idP,CC_id) - nCCE[CC_id];
                    //      break;// for the moment only schedule one
                }
            }
        }
1263
    }
1264 1265
}
#endif