eNB_scheduler_dlsch.c 75.6 KB
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/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
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 * the OAI Public License, Version 1.1  (the "License"); you may not use this file
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 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */
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/*! \file eNB_scheduler_dlsch.c
 * \brief procedures related to eNB for the DLSCH transport channel
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 * \author  Navid Nikaein and Raymond Knopp
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 * \date 2010 - 2014
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 * \email: navid.nikaein@eurecom.fr
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 * \version 1.0
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 * @ingroup _mac

 */

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

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

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

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

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

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#include "SIMULATION/TOOLS/defs.h"	// for taus
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#if defined(ENABLE_ITTI)
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#include "intertask_interface.h"
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#endif

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#include "T.h"

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#define ENABLE_MAC_PAYLOAD_DEBUG
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//#define DEBUG_eNB_SCHEDULER 1
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extern RAN_CONTEXT_t RC;
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extern uint8_t nfapi_mode;
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//------------------------------------------------------------------------------
void
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add_ue_dlsch_info(module_id_t module_idP,
		  int CC_id,
		  int UE_id, sub_frame_t subframeP, UE_DLSCH_STATUS status)
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//------------------------------------------------------------------------------
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{
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  //LOG_D(MAC, "%s(module_idP:%d, CC_id:%d, UE_id:%d, subframeP:%d, status:%d) serving_num:%d rnti:%x\n", __FUNCTION__, module_idP, CC_id, UE_id, subframeP, status, eNB_dlsch_info[module_idP][CC_id][UE_id].serving_num, UE_RNTI(module_idP,UE_id));
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    eNB_dlsch_info[module_idP][CC_id][UE_id].rnti =
	UE_RNTI(module_idP, UE_id);
    //  eNB_dlsch_info[module_idP][CC_id][ue_mod_idP].weight           = weight;
    eNB_dlsch_info[module_idP][CC_id][UE_id].subframe = subframeP;
    eNB_dlsch_info[module_idP][CC_id][UE_id].status = status;
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    eNB_dlsch_info[module_idP][CC_id][UE_id].serving_num++;
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}

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//------------------------------------------------------------------------------
int
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schedule_next_dlue(module_id_t module_idP, int CC_id,
		   sub_frame_t subframeP)
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//------------------------------------------------------------------------------
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{
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    int next_ue;
    UE_list_t *UE_list = &RC.mac[module_idP]->UE_list;
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    for (next_ue = UE_list->head; next_ue >= 0;
	 next_ue = UE_list->next[next_ue]) {
	if (eNB_dlsch_info[module_idP][CC_id][next_ue].status ==
	    S_DL_WAITING) {
	    return next_ue;
	}
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    }
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    for (next_ue = UE_list->head; next_ue >= 0;
	 next_ue = UE_list->next[next_ue]) {
	if (eNB_dlsch_info[module_idP][CC_id][next_ue].status ==
	    S_DL_BUFFERED) {
	    eNB_dlsch_info[module_idP][CC_id][next_ue].status =
		S_DL_WAITING;
	}
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    }
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    return (-1);		//next_ue;
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}

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//------------------------------------------------------------------------------
unsigned char
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generate_dlsch_header(unsigned char *mac_header,
		      unsigned char num_sdus,
		      unsigned short *sdu_lengths,
		      unsigned char *sdu_lcids,
		      unsigned char drx_cmd,
		      unsigned short timing_advance_cmd,
		      unsigned char *ue_cont_res_id,
		      unsigned char short_padding,
		      unsigned short post_padding)
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//------------------------------------------------------------------------------
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{
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    SCH_SUBHEADER_FIXED *mac_header_ptr =
	(SCH_SUBHEADER_FIXED *) mac_header;
    uint8_t first_element = 0, last_size = 0, i;
    uint8_t mac_header_control_elements[16], *ce_ptr;

    ce_ptr = &mac_header_control_elements[0];

    // compute header components

    if ((short_padding == 1) || (short_padding == 2)) {
	mac_header_ptr->R = 0;
	mac_header_ptr->E = 0;
	mac_header_ptr->LCID = SHORT_PADDING;
	first_element = 1;
	last_size = 1;
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    }
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    if (short_padding == 2) {
	mac_header_ptr->E = 1;
	mac_header_ptr++;
	mac_header_ptr->R = 0;
	mac_header_ptr->E = 0;
	mac_header_ptr->LCID = SHORT_PADDING;
	last_size = 1;
    }
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    if (drx_cmd != 255) {
	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;
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    }
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    if (timing_advance_cmd != 31) {
	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;
	AssertFatal(timing_advance_cmd < 64,
		    "timing_advance_cmd %d > 63\n", timing_advance_cmd);
	((TIMING_ADVANCE_CMD *) ce_ptr)->TA = timing_advance_cmd;	//(timing_advance_cmd+31)&0x3f;
	LOG_D(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);
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    }
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    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);
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    }
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    //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;
	}
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	if (sdu_lengths[i] < 128) {
	    ((SCH_SUBHEADER_SHORT *) mac_header_ptr)->R = 0;
	    ((SCH_SUBHEADER_SHORT *) mac_header_ptr)->E = 0;
	    ((SCH_SUBHEADER_SHORT *) mac_header_ptr)->F = 0;
	    ((SCH_SUBHEADER_SHORT *) mac_header_ptr)->LCID = sdu_lcids[i];
	    ((SCH_SUBHEADER_SHORT *) mac_header_ptr)->L =
		(unsigned char) sdu_lengths[i];
	    last_size = 2;
	} else {
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->R = 0;
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->E = 0;
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->F = 1;
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->LCID = sdu_lcids[i];
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->L_MSB =
		((unsigned short) sdu_lengths[i] >> 8) & 0x7f;
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->L_LSB =
		(unsigned short) sdu_lengths[i] & 0xff;
	    ((SCH_SUBHEADER_LONG *) mac_header_ptr)->padding = 0x00;
	    last_size = 3;
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#ifdef DEBUG_HEADER_PARSING
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	    LOG_D(MAC,
		  "[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);
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#endif
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	}
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    }
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    /*

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

       printf("last subheader : %x (R%d,E%d,LCID%d)\n",*(unsigned char*)mac_header_ptr,
       ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->R,
       ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->E,
       ((SCH_SUBHEADER_FIXED *)mac_header_ptr)->LCID);


       if (((SCH_SUBHEADER_FIXED*)mac_header_ptr)->LCID < UE_CONT_RES) {
       if (((SCH_SUBHEADER_SHORT*)mac_header_ptr)->F == 0)
       printf("F = 0, sdu len (L field) %d\n",(((SCH_SUBHEADER_SHORT*)mac_header_ptr)->L));
       else
       printf("F = 1, sdu len (L field) %d\n",(((SCH_SUBHEADER_LONG*)mac_header_ptr)->L));
       }
     */
    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++;
    }
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    //msg("After subheaders %d\n",(uint8_t*)mac_header_ptr - mac_header);
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    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);
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    }
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    //msg("After CEs %d\n",(uint8_t*)mac_header_ptr - mac_header);

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

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//------------------------------------------------------------------------------
void
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set_ul_DAI(int module_idP, int UE_idP, int CC_idP, int frameP,
	   int subframeP)
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//------------------------------------------------------------------------------
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{

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    eNB_MAC_INST *eNB = RC.mac[module_idP];
    UE_list_t *UE_list = &eNB->UE_list;
    unsigned char DAI;
    COMMON_channels_t *cc = &eNB->common_channels[CC_idP];
    if (cc->tdd_Config != NULL) {	//TDD
	DAI = (UE_list->UE_template[CC_idP][UE_idP].DAI - 1) & 3;
	LOG_D(MAC,
	      "[eNB %d] CC_id %d Frame %d, subframe %d: DAI %d for UE %d\n",
	      module_idP, CC_idP, frameP, subframeP, DAI, UE_idP);
	// Save DAI for Format 0 DCI

	switch (cc->tdd_Config->subframeAssignment) {
	case 0:
	    //      if ((subframeP==0)||(subframeP==1)||(subframeP==5)||(subframeP==6))
	    break;

	case 1:
	    switch (subframeP) {
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	    case 0:
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	    case 1:
		UE_list->UE_template[CC_idP][UE_idP].DAI_ul[7] = DAI;
		break;

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

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	    case 5:
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	    case 6:
		UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
		break;

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

	case 3:

	    //if ((subframeP==6)||(subframeP==8)||(subframeP==0)) {
	    //  LOG_D(MAC,"schedule_ue_spec: setting UL DAI to %d for subframeP %d => %d\n",DAI,subframeP, ((subframeP+8)%10)>>1);
	    //  UE_list->UE_template[CC_idP][UE_idP].DAI_ul[((subframeP+8)%10)>>1] = DAI;
	    //}
	    switch (subframeP) {
	    case 5:
	    case 6:
	    case 1:
		UE_list->UE_template[CC_idP][UE_idP].DAI_ul[2] = DAI;
		break;

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

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

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

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// changes to pre-processor for eMTC

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//------------------------------------------------------------------------------
void
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schedule_ue_spec(module_id_t module_idP,
		 frame_t frameP, sub_frame_t subframeP, int *mbsfn_flag)
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//------------------------------------------------------------------------------
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{
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    uint8_t CC_id;
    int UE_id;
    unsigned char aggregation;
    mac_rlc_status_resp_t rlc_status;
    unsigned char header_len_dcch = 0, header_len_dcch_tmp = 0;
    unsigned char header_len_dtch = 0, header_len_dtch_tmp =
	0, header_len_dtch_last = 0;
    unsigned char ta_len = 0;
    unsigned char sdu_lcids[NB_RB_MAX], lcid, offset, num_sdus = 0;
    uint16_t nb_rb, nb_rb_temp, nb_available_rb;
    uint16_t TBS, j, sdu_lengths[NB_RB_MAX], rnti, padding =
	0, post_padding = 0;
    unsigned char dlsch_buffer[MAX_DLSCH_PAYLOAD_BYTES];
    unsigned char round = 0;
    unsigned char harq_pid = 0;
    eNB_UE_STATS *eNB_UE_stats = NULL;
    uint16_t sdu_length_total = 0;

    eNB_MAC_INST *eNB = RC.mac[module_idP];
    COMMON_channels_t *cc = eNB->common_channels;
    UE_list_t *UE_list = &eNB->UE_list;
    int continue_flag = 0;
    int32_t normalized_rx_power, target_rx_power;
    int32_t tpc = 1;
    static int32_t tpc_accumulated = 0;
    UE_sched_ctrl *ue_sched_ctl;
    int mcs;
    int i;
    int min_rb_unit[MAX_NUM_CCs];
    int N_RB_DL[MAX_NUM_CCs];
    int total_nb_available_rb[MAX_NUM_CCs];
    int N_RBG[MAX_NUM_CCs];
    nfapi_dl_config_request_body_t *dl_req;
    nfapi_dl_config_request_pdu_t *dl_config_pdu;
    int tdd_sfa;
    int ta_update;
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#if 0
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    if (UE_list->head == -1) {
	return;
    }
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#endif
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    start_meas(&eNB->schedule_dlsch);
    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME
	(VCD_SIGNAL_DUMPER_FUNCTIONS_SCHEDULE_DLSCH, VCD_FUNCTION_IN);


    // for TDD: check that we have to act here, otherwise return
    if (cc[0].tdd_Config) {
	tdd_sfa = cc[0].tdd_Config->subframeAssignment;
	switch (subframeP) {
	case 0:
	    // always continue
	    break;
	case 1:
	    return;
	    break;
	case 2:
	    return;
	    break;
	case 3:
	    if ((tdd_sfa != 2) && (tdd_sfa != 5))
		return;
	    break;
	case 4:
	    if ((tdd_sfa != 1) && (tdd_sfa != 2) && (tdd_sfa != 4)
		&& (tdd_sfa != 5))
		return;
	    break;
	case 5:
	    break;
	case 6:
	case 7:
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	    if ((tdd_sfa != 3)&& (tdd_sfa != 4) && (tdd_sfa != 5))
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		return;
	    break;
	case 8:
	    if ((tdd_sfa != 2) && (tdd_sfa != 3) && (tdd_sfa != 4)
		&& (tdd_sfa != 5))
		return;
	    break;
	case 9:
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	    if (tdd_sfa == 0)
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		return;
	    break;
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	  }
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    }
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    //weight = get_ue_weight(module_idP,UE_id);
    aggregation = 2;
    for (CC_id = 0; CC_id < MAX_NUM_CCs; CC_id++) {
	N_RB_DL[CC_id] = to_prb(cc[CC_id].mib->message.dl_Bandwidth);
	min_rb_unit[CC_id] = get_min_rb_unit(module_idP, CC_id);
	// get number of PRBs less those used by common channels
	total_nb_available_rb[CC_id] = N_RB_DL[CC_id];
	for (i = 0; i < N_RB_DL[CC_id]; i++)
	    if (cc[CC_id].vrb_map[i] != 0)
		total_nb_available_rb[CC_id]--;

	N_RBG[CC_id] = to_rbg(cc[CC_id].mib->message.dl_Bandwidth);

	// store the global enb stats:
	eNB->eNB_stats[CC_id].num_dlactive_UEs = UE_list->num_UEs;
	eNB->eNB_stats[CC_id].available_prbs =
	    total_nb_available_rb[CC_id];
	eNB->eNB_stats[CC_id].total_available_prbs +=
	    total_nb_available_rb[CC_id];
	eNB->eNB_stats[CC_id].dlsch_bytes_tx = 0;
	eNB->eNB_stats[CC_id].dlsch_pdus_tx = 0;
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    }
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  /// CALLING Pre_Processor for downlink scheduling (Returns estimation of RBs required by each UE and the allocation on sub-band)
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_DLSCH_PREPROCESSOR,VCD_FUNCTION_IN);
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  start_meas(&eNB->schedule_dlsch_preprocessor);
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  dlsch_scheduler_pre_processor(module_idP,
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                                frameP,
                                subframeP,
                                N_RBG,
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                                mbsfn_flag);
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  stop_meas(&eNB->schedule_dlsch_preprocessor);
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_DLSCH_PREPROCESSOR,VCD_FUNCTION_OUT);
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  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
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    LOG_D(MAC, "doing schedule_ue_spec for CC_id %d\n",CC_id);
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    dl_req        = &eNB->DL_req[CC_id].dl_config_request_body;

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    if (mbsfn_flag[CC_id]>0)
      continue;
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    for (UE_id=UE_list->head; UE_id>=0; UE_id=UE_list->next[UE_id]) {
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      continue_flag=0; // reset the flag to allow allocation for the remaining UEs
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      rnti = UE_RNTI(module_idP,UE_id);
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      eNB_UE_stats = &UE_list->eNB_UE_stats[CC_id][UE_id];
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      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
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      if (rnti==NOT_A_RNTI) {
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        LOG_D(MAC,"Cannot find rnti for UE_id %d (num_UEs %d)\n",UE_id,UE_list->num_UEs);
        continue_flag=1;
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      }
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      if (eNB_UE_stats==NULL) {
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        LOG_D(MAC,"[eNB] Cannot find eNB_UE_stats\n");
        continue_flag=1;
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      }
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      if (continue_flag != 1){
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        switch(get_tmode(module_idP,CC_id,UE_id)){
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        case 1:
        case 2:
        case 7:
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			  aggregation = get_aggregation(get_bw_index(module_idP,CC_id), 
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					ue_sched_ctl->dl_cqi[CC_id],
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					format1);
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		    break;
		case 3:
		    aggregation =
			get_aggregation(get_bw_index(module_idP, CC_id),
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					ue_sched_ctl->dl_cqi[CC_id],
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					format2A);
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		    break;
		default:
		    LOG_W(MAC, "Unsupported transmission mode %d\n",
			  get_tmode(module_idP, CC_id, UE_id));
		    aggregation = 2;
		}
	    }
	    /* if (continue_flag != 1 */
	    if ((ue_sched_ctl->pre_nb_available_rbs[CC_id] == 0) ||	// no RBs allocated 
		CCE_allocation_infeasible(module_idP, CC_id, 1, subframeP,
					  aggregation, rnti)) {
		LOG_D(MAC,
		      "[eNB %d] Frame %d : no RB allocated for UE %d on CC_id %d: continue \n",
		      module_idP, frameP, UE_id, CC_id);
		continue_flag = 1;	//to next user (there might be rbs availiable for other UEs in TM5
	    }
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	    if (cc[CC_id].tdd_Config != NULL) {	//TDD
		set_ue_dai(subframeP,
			   UE_id,
			   CC_id,
			   cc[CC_id].tdd_Config->subframeAssignment,
			   UE_list);
		// update UL DAI after DLSCH scheduling
		set_ul_DAI(module_idP, UE_id, CC_id, frameP, subframeP);
	    }
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	    if (continue_flag == 1) {
		add_ue_dlsch_info(module_idP,
				  CC_id, UE_id, subframeP, S_DL_NONE);
		continue;
	    }
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#warning RK->CR This old API call has to be revisited for FAPI, or logic must be changed
#if 0
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	    /* add "fake" DCI to have CCE_allocation_infeasible work properly for next allocations */
	    /* if we don't add it, next allocations may succeed but overall allocations may fail */
	    /* will be removed at the end of this function */
	    add_ue_spec_dci(&eNB->common_channels[CC_id].DCI_pdu, &(char[]) {
			    0}, rnti, 1, aggregation, 1, format1, 0);
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#endif
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	    nb_available_rb = ue_sched_ctl->pre_nb_available_rbs[CC_id];
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	    harq_pid = frame_subframe2_dl_harq_pid(cc->tdd_Config,frameP ,subframeP);
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	    round = ue_sched_ctl->round[CC_id][harq_pid];
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	    UE_list->eNB_UE_stats[CC_id][UE_id].crnti = rnti;
	    UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status =
		mac_eNB_get_rrc_status(module_idP, rnti);
	    UE_list->eNB_UE_stats[CC_id][UE_id].harq_pid = harq_pid;
	    UE_list->eNB_UE_stats[CC_id][UE_id].harq_round = round;
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	    if (UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status <
		RRC_CONNECTED)
		continue;
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	    sdu_length_total = 0;
	    num_sdus = 0;
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	    /*
	       DevCheck(((eNB_UE_stats->dl_cqi < MIN_CQI_VALUE) || (eNB_UE_stats->dl_cqi > MAX_CQI_VALUE)),
	       eNB_UE_stats->dl_cqi, MIN_CQI_VALUE, MAX_CQI_VALUE);
	     */
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            if (nfapi_mode) {
              eNB_UE_stats->dlsch_mcs1 = 10;//cqi_to_mcs[ue_sched_ctl->dl_cqi[CC_id]];
            }
            else {
              eNB_UE_stats->dlsch_mcs1 = cqi_to_mcs[ue_sched_ctl->dl_cqi[CC_id]];
            }
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	    eNB_UE_stats->dlsch_mcs1 = eNB_UE_stats->dlsch_mcs1;	//cmin(eNB_UE_stats->dlsch_mcs1, openair_daq_vars.target_ue_dl_mcs);
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	    // store stats
	    //UE_list->eNB_UE_stats[CC_id][UE_id].dl_cqi= eNB_UE_stats->dl_cqi;
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	    // initializing the rb allocation indicator for each UE
	    for (j = 0; j < N_RBG[CC_id]; j++) {
		UE_list->
		    UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j]
		    = 0;
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	    }
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	    LOG_D(MAC,
		  "[eNB %d] Frame %d: Scheduling UE %d on CC_id %d (rnti %x, harq_pid %d, round %d, rb %d, cqi %d, mcs %d, rrc %d)\n",
		  module_idP, frameP, UE_id, CC_id, rnti, harq_pid, round,
		  nb_available_rb, ue_sched_ctl->dl_cqi[CC_id],
		  eNB_UE_stats->dlsch_mcs1,
		  UE_list->eNB_UE_stats[CC_id][UE_id].rrc_status);



	    /* process retransmission  */

	    if (round != 8) {

		// get freq_allocation
		nb_rb = UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid];
		TBS =
		    get_TBS_DL(UE_list->
			       UE_template[CC_id][UE_id].oldmcs1[harq_pid],
			       nb_rb);

		if (nb_rb <= nb_available_rb) {
		    if (cc[CC_id].tdd_Config != NULL) {
			UE_list->UE_template[CC_id][UE_id].DAI++;
			update_ul_dci(module_idP, CC_id, rnti,
				      UE_list->UE_template[CC_id][UE_id].
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				      DAI,subframeP);
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			LOG_D(MAC,
			      "DAI update: CC_id %d subframeP %d: UE %d, DAI %d\n",
			      CC_id, subframeP, UE_id,
			      UE_list->UE_template[CC_id][UE_id].DAI);
		    }

		    if (nb_rb == ue_sched_ctl->pre_nb_available_rbs[CC_id]) {
			for (j = 0; j < N_RBG[CC_id]; j++) {	// for indicating the rballoc for each sub-band
			    UE_list->UE_template[CC_id][UE_id].
				rballoc_subband[harq_pid][j] =
				ue_sched_ctl->rballoc_sub_UE[CC_id][j];
			}
		    } else {
			nb_rb_temp = nb_rb;
			j = 0;

			while ((nb_rb_temp > 0) && (j < N_RBG[CC_id])) {
			    if (ue_sched_ctl->rballoc_sub_UE[CC_id][j] ==
				1) {
				if (UE_list->
				    UE_template[CC_id]
				    [UE_id].rballoc_subband[harq_pid][j])
				    printf
					("WARN: rballoc_subband not free for retrans?\n");
				UE_list->
				    UE_template[CC_id]
				    [UE_id].rballoc_subband[harq_pid][j] =
				    ue_sched_ctl->rballoc_sub_UE[CC_id][j];

				if ((j == N_RBG[CC_id] - 1) &&
				    ((N_RB_DL[CC_id] == 25) ||
				     (N_RB_DL[CC_id] == 50))) {
				    nb_rb_temp =
					nb_rb_temp - min_rb_unit[CC_id] +
					1;
				} else {
				    nb_rb_temp =
					nb_rb_temp - min_rb_unit[CC_id];
				}
			    }

			    j = j + 1;
			}
		    }

		    nb_available_rb -= nb_rb;
		    /*
		       eNB->mu_mimo_mode[UE_id].pre_nb_available_rbs = nb_rb;
		       eNB->mu_mimo_mode[UE_id].dl_pow_off = ue_sched_ctl->dl_pow_off[CC_id];

		       for(j=0; j<N_RBG[CC_id]; j++) {
		       eNB->mu_mimo_mode[UE_id].rballoc_sub[j] = UE_list->UE_template[CC_id][UE_id].rballoc_subband[harq_pid][j];
		       }
		     */

		    switch (get_tmode(module_idP, CC_id, UE_id)) {
		    case 1:
		    case 2:
		    case 7:
		    default:
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                      LOG_D(MAC,"retransmission DL_REQ: rnti:%x\n",rnti);
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			dl_config_pdu =
			    &dl_req->dl_config_pdu_list[dl_req->
							number_pdu];
			memset((void *) dl_config_pdu, 0,
			       sizeof(nfapi_dl_config_request_pdu_t));
			dl_config_pdu->pdu_type =
			    NFAPI_DL_CONFIG_DCI_DL_PDU_TYPE;
			dl_config_pdu->pdu_size =
			    (uint8_t) (2 +
				       sizeof(nfapi_dl_config_dci_dl_pdu));
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                        dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.tl.tag = NFAPI_DL_CONFIG_REQUEST_DCI_DL_PDU_REL8_TAG;
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			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.
			    dci_format = NFAPI_DL_DCI_FORMAT_1;
			dl_config_pdu->dci_dl_pdu.
			    dci_dl_pdu_rel8.aggregation_level =
			    get_aggregation(get_bw_index
					    (module_idP, CC_id),
					    ue_sched_ctl->dl_cqi[CC_id],
					    format1);
			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti =
			    rnti;
			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti_type = 1;	// CRNTI : see Table 4-10 from SCF082 - nFAPI specifications
			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.transmission_power = 6000;	// equal to RS power

			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.
			    harq_process = harq_pid;
			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.tpc = 1;	// dont adjust power when retransmitting
			dl_config_pdu->dci_dl_pdu.
			    dci_dl_pdu_rel8.new_data_indicator_1 =
			    UE_list->UE_template[CC_id][UE_id].
			    oldNDI[harq_pid];
			dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.mcs_1 =
			    UE_list->UE_template[CC_id][UE_id].
			    oldmcs1[harq_pid];
			dl_config_pdu->dci_dl_pdu.
			    dci_dl_pdu_rel8.redundancy_version_1 =
			    round & 3;

			if (cc[CC_id].tdd_Config != NULL) {	//TDD
			    dl_config_pdu->dci_dl_pdu.
				dci_dl_pdu_rel8.downlink_assignment_index =
				(UE_list->UE_template[CC_id][UE_id].DAI -
				 1) & 3;
			    LOG_D(MAC,
				  "[eNB %d] Retransmission CC_id %d : harq_pid %d, round %d, dai %d, mcs %d\n",
				  module_idP, CC_id, harq_pid, round,
				  (UE_list->UE_template[CC_id][UE_id].DAI -
				   1),
				  UE_list->
				  UE_template[CC_id][UE_id].oldmcs1
				  [harq_pid]);
			} else {
			    LOG_D(MAC,
				  "[eNB %d] Retransmission CC_id %d : harq_pid %d, round %d, mcs %d\n",
				  module_idP, CC_id, harq_pid, round,
				  UE_list->
				  UE_template[CC_id][UE_id].oldmcs1
				  [harq_pid]);

			}
			if (!CCE_allocation_infeasible
			    (module_idP, CC_id, 1, subframeP,
			     dl_config_pdu->dci_dl_pdu.
			     dci_dl_pdu_rel8.aggregation_level, rnti)) {
			    dl_req->number_dci++;
			    dl_req->number_pdu++;
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                            dl_req->tl.tag = NFAPI_DL_CONFIG_REQUEST_BODY_TAG;

                            eNB->DL_req[CC_id].sfn_sf = frameP<<4 | subframeP;
                            eNB->DL_req[CC_id].header.message_id = NFAPI_DL_CONFIG_REQUEST;
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			    fill_nfapi_dlsch_config(eNB, dl_req, TBS, -1
						    /* retransmission, no pdu_index */
						    , rnti, 0,	// type 0 allocation from 7.1.6 in 36.213
						    0,	// virtual_resource_block_assignment_flag, unused here
						    0,	// resource_block_coding, to be filled in later
						    getQm(UE_list->UE_template[CC_id][UE_id].oldmcs1[harq_pid]), round & 3,	// redundancy version
						    1,	// transport blocks
						    0,	// transport block to codeword swap flag
						    cc[CC_id].p_eNB == 1 ? 0 : 1,	// transmission_scheme
						    1,	// number of layers
						    1,	// number of subbands
						    //                      uint8_t codebook_index,
						    4,	// UE category capacity
						    UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->pdsch_ConfigDedicated->p_a, 0,	// delta_power_offset for TM5
						    0,	// ngap
						    0,	// nprb
						    cc[CC_id].p_eNB == 1 ? 1 : 2,	// transmission mode
						    0,	//number of PRBs treated as one subband, not used here
						    0	// number of beamforming vectors, not used here
				);

			    LOG_D(MAC,
				  "Filled NFAPI configuration for DCI/DLSCH %d, retransmission round %d\n",
				  eNB->pdu_index[CC_id], round);

			    program_dlsch_acknak(module_idP, CC_id, UE_id,
						 frameP, subframeP,
						 dl_config_pdu->
						 dci_dl_pdu.dci_dl_pdu_rel8.
						 cce_idx);
			    // No TX request for retransmission (check if null request for FAPI)
			} else {
			    LOG_W(MAC,
				  "Frame %d, Subframe %d: Dropping DLSCH allocation for UE %d\%x, infeasible CCE allocation\n",
				  frameP, subframeP, UE_id, rnti);
			}
		    }


		    add_ue_dlsch_info(module_idP,
				      CC_id, UE_id, subframeP,
				      S_DL_SCHEDULED);

		    //eNB_UE_stats->dlsch_trials[round]++;
		    UE_list->eNB_UE_stats[CC_id][UE_id].
			num_retransmission += 1;
		    UE_list->eNB_UE_stats[CC_id][UE_id].rbs_used_retx =
			nb_rb;
		    UE_list->eNB_UE_stats[CC_id][UE_id].
			total_rbs_used_retx += nb_rb;
		    UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs1 =
			eNB_UE_stats->dlsch_mcs1;
		    UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs2 =
			eNB_UE_stats->dlsch_mcs1;
		} else {
		    LOG_D(MAC,
			  "[eNB %d] Frame %d CC_id %d : don't schedule UE %d, its retransmission takes more resources than we have\n",
			  module_idP, frameP, CC_id, UE_id);
		}
	    } else {		/* This is a potentially new SDU opportunity */

		rlc_status.bytes_in_buffer = 0;
		// Now check RLC information to compute number of required RBs
		// get maximum TBS size for RLC request
		TBS =
		    get_TBS_DL(eNB_UE_stats->dlsch_mcs1, nb_available_rb);
		// check first for RLC data on DCCH
		// add the length for  all the control elements (timing adv, drx, etc) : header + payload

		if (ue_sched_ctl->ta_timer == 0) {
		    ta_update = ue_sched_ctl->ta_update;
		    /* if we send TA then set timer to not send it for a while */
		    if (ta_update != 31)
			ue_sched_ctl->ta_timer = 20;
		    /* reset ta_update */
		    ue_sched_ctl->ta_update = 31;
		} else {
		    ta_update = 31;
		}

		ta_len = (ta_update != 31) ? 2 : 0;

		header_len_dcch = 2;	// 2 bytes DCCH SDU subheader

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

		    sdu_lengths[0] = 0;

		    if (rlc_status.bytes_in_buffer > 0) {	// There is DCCH to transmit
			LOG_D(MAC,
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			      "[eNB %d] SFN/SF %d.%d, DL-DCCH->DLSCH CC_id %d, Requesting %d bytes from RLC (RRC message)\n",
			      module_idP, frameP, subframeP, CC_id,
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			      TBS - header_len_dcch);
			sdu_lengths[0] = mac_rlc_data_req(module_idP, rnti, module_idP, frameP, ENB_FLAG_YES, MBMS_FLAG_NO, DCCH, TBS,	//not used
							  (char *)
							  &dlsch_buffer
							  [0]);
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            pthread_mutex_lock(&rrc_release_freelist);
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            if((rrc_release_info.num_UEs > 0) && (rlc_am_mui.rrc_mui_num > 0)){
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              uint16_t release_total = 0;
              for(uint16_t release_num = 0;release_num < NUMBER_OF_UE_MAX;release_num++){
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                if(rrc_release_info.RRC_release_ctrl[release_num].flag > 0){
                  release_total++;
                }else{
                  continue;
                }

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                if(rrc_release_info.RRC_release_ctrl[release_num].flag == 1){
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                  if(rrc_release_info.RRC_release_ctrl[release_num].rnti == rnti){
                    for(uint16_t mui_num = 0;mui_num < rlc_am_mui.rrc_mui_num;mui_num++){
                      if(rrc_release_info.RRC_release_ctrl[release_num].rrc_eNB_mui == rlc_am_mui.rrc_mui[mui_num]){
                        rrc_release_info.RRC_release_ctrl[release_num].flag = 3;
                        LOG_D(MAC,"DLSCH Release send:index %d rnti %x mui %d mui_num %d flag 1->3\n",release_num,rnti,rlc_am_mui.rrc_mui[mui_num],mui_num);
                        break;
                       }
                     }
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                  }
                }
                if(rrc_release_info.RRC_release_ctrl[release_num].flag == 2){
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                  if(rrc_release_info.RRC_release_ctrl[release_num].rnti == rnti){
                    for(uint16_t mui_num = 0;mui_num < rlc_am_mui.rrc_mui_num;mui_num++){
                      if(rrc_release_info.RRC_release_ctrl[release_num].rrc_eNB_mui == rlc_am_mui.rrc_mui[mui_num]){
                          rrc_release_info.RRC_release_ctrl[release_num].flag = 4;
                          LOG_D(MAC,"DLSCH Release send:index %d rnti %x mui %d mui_num %d flag 2->4\n",release_num,rnti,rlc_am_mui.rrc_mui[mui_num],mui_num);
                          break;
                      }
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                    }
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                  }
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                }
                if(release_total >= rrc_release_info.num_UEs)
                  break;
              }
            }
            pthread_mutex_unlock(&rrc_release_freelist);
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            RA_t *ra = &eNB->common_channels[CC_id].ra[0];
            for (uint8_t ra_ii = 0; ra_ii < NB_RA_PROC_MAX; ra_ii++) {
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              if((ra[ra_ii].rnti == rnti) && (ra[ra_ii].state == MSGCRNTI)){
                for(uint16_t mui_num = 0;mui_num < rlc_am_mui.rrc_mui_num;mui_num++){
                  if(ra[ra_ii].crnti_rrc_mui == rlc_am_mui.rrc_mui[mui_num]){
                    ra[ra_ii].crnti_harq_pid = harq_pid;
                    ra[ra_ii].state = MSGCRNTI_ACK;
                    break;
                  }
                }
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              }
            }
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			T(T_ENB_MAC_UE_DL_SDU, T_INT(module_idP),
			  T_INT(CC_id), T_INT(rnti), T_INT(frameP),
			  T_INT(subframeP), T_INT(harq_pid), T_INT(DCCH),
			  T_INT(sdu_lengths[0]));
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                       LOG_D(MAC,
                             "[eNB %d][DCCH] CC_id %d frame %d subframe %d UE_id %d/%x Got %d bytes bytes_in_buffer %d from release_num %d\n",
                             module_idP, CC_id, frameP, subframeP, UE_id, rnti, sdu_lengths[0],rlc_status.bytes_in_buffer,rrc_release_info.num_UEs);
 
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			sdu_length_total = sdu_lengths[0];
			sdu_lcids[0] = DCCH;
			UE_list->eNB_UE_stats[CC_id][UE_id].
			    num_pdu_tx[DCCH] += 1;
			UE_list->
			    eNB_UE_stats[CC_id][UE_id].num_bytes_tx[DCCH]
			    += sdu_lengths[0];
			num_sdus = 1;
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#ifdef DEBUG_eNB_SCHEDULER
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			LOG_T(MAC,
			      "[eNB %d][DCCH] CC_id %d Got %d bytes :",
			      module_idP, CC_id, sdu_lengths[0]);
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			for (j = 0; j < sdu_lengths[0]; j++) {
			    LOG_T(MAC, "%x ", dlsch_buffer[j]);
			}
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			LOG_T(MAC, "\n");
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#endif
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		    } else {
			header_len_dcch = 0;
			sdu_length_total = 0;
		    }
		}
		// check for DCCH1 and update header information (assume 2 byte sub-header)
		if (TBS - ta_len - header_len_dcch - sdu_length_total > 0) {
		    rlc_status = mac_rlc_status_ind(module_idP, rnti, module_idP, frameP, subframeP, ENB_FLAG_YES, MBMS_FLAG_NO, DCCH + 1, (TBS - ta_len - header_len_dcch - sdu_length_total));	// transport block set size less allocations for timing advance and
		    // DCCH SDU
		    sdu_lengths[num_sdus] = 0;

		    if (rlc_status.bytes_in_buffer > 0) {
			LOG_D(MAC,
			      "[eNB %d], Frame %d, DCCH1->DLSCH, CC_id %d, Requesting %d bytes from RLC (RRC message)\n",
			      module_idP, frameP, CC_id,
			      TBS - header_len_dcch - sdu_length_total);
			sdu_lengths[num_sdus] += mac_rlc_data_req(module_idP, rnti, module_idP, frameP, ENB_FLAG_YES, MBMS_FLAG_NO, DCCH + 1, TBS,	//not used
								  (char *)
								  &dlsch_buffer
								  [sdu_length_total]);

			T(T_ENB_MAC_UE_DL_SDU, T_INT(module_idP),
			  T_INT(CC_id), T_INT(rnti), T_INT(frameP),
			  T_INT(subframeP), T_INT(harq_pid),
			  T_INT(DCCH + 1), T_INT(sdu_lengths[num_sdus]));

			sdu_lcids[num_sdus] = DCCH1;
			sdu_length_total += sdu_lengths[num_sdus];
			header_len_dcch += 2;
			UE_list->eNB_UE_stats[CC_id][UE_id].
			    num_pdu_tx[DCCH1] += 1;
			UE_list->
			    eNB_UE_stats[CC_id][UE_id].num_bytes_tx[DCCH1]
			    += sdu_lengths[num_sdus];
			num_sdus++;
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#ifdef DEBUG_eNB_SCHEDULER
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			LOG_T(MAC,
			      "[eNB %d][DCCH1] CC_id %d Got %d bytes :",
			      module_idP, CC_id, sdu_lengths[num_sdus]);
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			for (j = 0; j < sdu_lengths[num_sdus]; j++) {
			    LOG_T(MAC, "%x ", dlsch_buffer[j]);
			}
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			LOG_T(MAC, "\n");
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#endif
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		    }
		}
		// assume the max dtch header size, and adjust it later
		header_len_dtch = 0;
		header_len_dtch_last = 0;	// the header length of the last mac sdu
		// lcid has to be sorted before the actual allocation (similar struct as ue_list).
		for (lcid = NB_RB_MAX - 1; lcid >= DTCH; lcid--) {
		    // TBD: check if the lcid is active

		    header_len_dtch += 3;
		    header_len_dtch_last = 3;
		    LOG_D(MAC,
			  "[eNB %d], Frame %d, DTCH%d->DLSCH, Checking RLC status (tbs %d, len %d)\n",
			  module_idP, frameP, lcid, TBS,
			  TBS - ta_len - header_len_dcch -
			  sdu_length_total - header_len_dtch);

		    if (TBS - ta_len - header_len_dcch - sdu_length_total - header_len_dtch > 0) {	// NN: > 2 ? 
			rlc_status = mac_rlc_status_ind(module_idP,
							rnti,
							module_idP,
							frameP,
							subframeP,
							ENB_FLAG_YES,
							MBMS_FLAG_NO,
							lcid,
							TBS - ta_len -
							header_len_dcch -
							sdu_length_total -
							header_len_dtch);


			if (rlc_status.bytes_in_buffer > 0) {

			    LOG_D(MAC,
				  "[eNB %d][USER-PLANE DEFAULT DRB] Frame %d : DTCH->DLSCH, Requesting %d bytes from RLC (lcid %d total hdr len %d)\n",
				  module_idP, frameP,
				  TBS - header_len_dcch -
				  sdu_length_total - header_len_dtch, lcid,
				  header_len_dtch);
			    sdu_lengths[num_sdus] = mac_rlc_data_req(module_idP, rnti, module_idP, frameP, ENB_FLAG_YES, MBMS_FLAG_NO, lcid, TBS,	//not used
								     (char
								      *)
								     &dlsch_buffer
								     [sdu_length_total]);
			    T(T_ENB_MAC_UE_DL_SDU, T_INT(module_idP),
			      T_INT(CC_id), T_INT(rnti), T_INT(frameP),
			      T_INT(subframeP), T_INT(harq_pid),
			      T_INT(lcid), T_INT(sdu_lengths[num_sdus]));

			    LOG_D(MAC,
				  "[eNB %d][USER-PLANE DEFAULT DRB] Got %d bytes for DTCH %d \n",
				  module_idP, sdu_lengths[num_sdus], lcid);
			    sdu_lcids[num_sdus] = lcid;
			    sdu_length_total += sdu_lengths[num_sdus];
			    UE_list->
				eNB_UE_stats[CC_id][UE_id].num_pdu_tx[lcid]
				+= 1;
			    UE_list->
				eNB_UE_stats[CC_id][UE_id].num_bytes_tx
				[lcid] += sdu_lengths[num_sdus];
			    if (sdu_lengths[num_sdus] < 128) {
				header_len_dtch--;
				header_len_dtch_last--;
			    }
			    num_sdus++;
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                            UE_list->UE_sched_ctrl[UE_id].uplane_inactivity_timer = 0;
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			}	// no data for this LCID
			else {
			    header_len_dtch -= 3;
			}
		    }		// no TBS left
		    else {
			header_len_dtch -= 3;
			break;
		    }
		}
		if (header_len_dtch == 0)
		    header_len_dtch_last = 0;
		// there is at least one SDU 
		// if (num_sdus > 0 ){
		if ((sdu_length_total + header_len_dcch +
		     header_len_dtch) > 0) {

		    // Now compute number of required RBs for total sdu length
		    // Assume RAH format 2
		    // adjust  header lengths
		    header_len_dcch_tmp = header_len_dcch;
		    header_len_dtch_tmp = header_len_dtch;
		    if (header_len_dtch == 0) {
			header_len_dcch = (header_len_dcch > 0) ? 1 : 0;	//header_len_dcch;  // remove length field
		    } else {
			header_len_dtch_last -= 1;	// now use it to find how many bytes has to be removed for the last MAC SDU 
			header_len_dtch = (header_len_dtch > 0) ? header_len_dtch - header_len_dtch_last : header_len_dtch;	// remove length field for the last SDU
		    }

		    mcs = eNB_UE_stats->dlsch_mcs1;
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		    if (mcs == 0) {
			nb_rb = 4;	// don't let the TBS get too small
		    } else {
			nb_rb = min_rb_unit[CC_id];
		    }
		    TBS = get_TBS_DL(mcs, nb_rb);

		    while (TBS <
			   (sdu_length_total + header_len_dcch +
			    header_len_dtch + ta_len)) {
			nb_rb += min_rb_unit[CC_id];	//

			if (nb_rb > nb_available_rb) {	// if we've gone beyond the maximum number of RBs
			    // (can happen if N_RB_DL is odd)
			    TBS =
				get_TBS_DL(eNB_UE_stats->dlsch_mcs1,
					   nb_available_rb);
			    nb_rb = nb_available_rb;
			    break;
			}

			TBS = get_TBS_DL(eNB_UE_stats->dlsch_mcs1, nb_rb);
		    }

		    if (nb_rb == ue_sched_ctl->pre_nb_available_rbs[CC_id]) {
			for (j = 0; j < N_RBG[CC_id]; j++) {	// for indicating the rballoc for each sub-band
			    UE_list->UE_template[CC_id][UE_id].
				rballoc_subband[harq_pid][j] =
				ue_sched_ctl->rballoc_sub_UE[CC_id][j];
			}
		    } else {
			nb_rb_temp = nb_rb;
			j = 0;

			while ((nb_rb_temp > 0) && (j < N_RBG[CC_id])) {
			    if (ue_sched_ctl->rballoc_sub_UE[CC_id][j] ==
				1) {
				UE_list->
				    UE_template[CC_id]
				    [UE_id].rballoc_subband[harq_pid][j] =
				    ue_sched_ctl->rballoc_sub_UE[CC_id][j];

				if ((j == N_RBG[CC_id] - 1) &&
				    ((N_RB_DL[CC_id] == 25) ||
				     (N_RB_DL[CC_id] == 50))) {
				    nb_rb_temp =
					nb_rb_temp - min_rb_unit[CC_id] +
					1;
				} else {
				    nb_rb_temp =
					nb_rb_temp - min_rb_unit[CC_id];
				}
			    }

			    j = j + 1;
			}
		    }

		    // decrease mcs until TBS falls below required length
		    while ((TBS >
			    (sdu_length_total + header_len_dcch +
			     header_len_dtch + ta_len)) && (mcs > 0)) {
			mcs--;
			TBS = get_TBS_DL(mcs, nb_rb);
		    }

		    // if we have decreased too much or we don't have enough RBs, increase MCS
		    while ((TBS <
			    (sdu_length_total + header_len_dcch +
			     header_len_dtch + ta_len))
			   && (((ue_sched_ctl->dl_pow_off[CC_id] > 0)
				&& (mcs < 28))
			       || ((ue_sched_ctl->dl_pow_off[CC_id] == 0)
				   && (mcs <= 15)))) {
			mcs++;
			TBS = get_TBS_DL(mcs, nb_rb);
		    }

		    LOG_D(MAC,
			  "dlsch_mcs before and after the rate matching = (%d, %d)\n",
			  eNB_UE_stats->dlsch_mcs1, mcs);
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#ifdef DEBUG_eNB_SCHEDULER
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		    LOG_D(MAC,
			  "[eNB %d] CC_id %d Generated DLSCH header (mcs %d, TBS %d, nb_rb %d)\n",
			  module_idP, CC_id, mcs, TBS, nb_rb);
		    // msg("[MAC][eNB ] Reminder of DLSCH with random data %d %d %d %d \n",
		    //  TBS, sdu_length_total, offset, TBS-sdu_length_total-offset);
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#endif
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		    if ((TBS - header_len_dcch - header_len_dtch -
			 sdu_length_total - ta_len) <= 2) {
			padding =
			    (TBS - header_len_dcch - header_len_dtch -
			     sdu_length_total - ta_len);
			post_padding = 0;
		    } else {
			padding = 0;

			// adjust the header len
			if (header_len_dtch == 0) {
			    header_len_dcch = header_len_dcch_tmp;
			} else {	//if (( header_len_dcch==0)&&((header_len_dtch==1)||(header_len_dtch==2)))
			    header_len_dtch = header_len_dtch_tmp;
			}

			post_padding = TBS - sdu_length_total - header_len_dcch - header_len_dtch - ta_len;	// 1 is for the postpadding header
		    }

		    offset = generate_dlsch_header((unsigned char *) UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0], num_sdus,	//num_sdus
						   sdu_lengths,	//
						   sdu_lcids, 255,	// no drx
						   ta_update,	// timing advance
						   NULL,	// contention res id
						   padding, post_padding);

		    //#ifdef DEBUG_eNB_SCHEDULER
		    if (ta_update != 31) {
			LOG_D(MAC,
			      "[eNB %d][DLSCH] Frame %d Generate header for UE_id %d on CC_id %d: sdu_length_total %d, num_sdus %d, sdu_lengths[0] %d, sdu_lcids[0] %d => payload offset %d,timing advance value : %d, padding %d,post_padding %d,(mcs %d, TBS %d, nb_rb %d),header_dcch %d, header_dtch %d\n",
			      module_idP, frameP, UE_id, CC_id,
			      sdu_length_total, num_sdus, sdu_lengths[0],
			      sdu_lcids[0], offset, ta_update, padding,
			      post_padding, mcs, TBS, nb_rb,
			      header_len_dcch, header_len_dtch);
		    }
		    //#endif
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		    LOG_T(MAC, "[eNB %d] First 16 bytes of DLSCH : \n");
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		    for (i = 0; i < 16; i++) {
			LOG_T(MAC, "%x.", dlsch_buffer[i]);
		    }
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		    LOG_T(MAC, "\n");
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#endif
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          // cycle through SDUs and place in dlsch_buffer
          memcpy(&UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0][offset],dlsch_buffer,sdu_length_total);
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          // memcpy(RC.mac[0].DLSCH_pdu[0][0].payload[0][offset],dcch_buffer,sdu_lengths[0]);
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          // fill remainder of DLSCH with random data
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          for (j=0; j<(TBS-sdu_length_total-offset); j++) {
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            UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0][offset+sdu_length_total+j] = (char)(taus()&0xff);
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          }
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          if (opt_enabled == 1) {
            trace_pdu(1, (uint8_t *)UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0],
                      TBS, module_idP, 3, UE_RNTI(module_idP,UE_id),
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                      eNB->frame, eNB->subframe,0,0);
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            LOG_D(OPT,"[eNB %d][DLSCH] CC_id %d Frame %d  rnti %x  with size %d\n",
                  module_idP, CC_id, frameP, UE_RNTI(module_idP,UE_id), TBS);
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          }

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          T(T_ENB_MAC_UE_DL_PDU_WITH_DATA, T_INT(module_idP), T_INT(CC_id), T_INT(rnti), T_INT(frameP), T_INT(subframeP),
            T_INT(harq_pid), T_BUFFER(UE_list->DLSCH_pdu[CC_id][0][UE_id].payload[0], TBS));

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	  UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid] = nb_rb;
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          add_ue_dlsch_info(module_idP,
                            CC_id,
                            UE_id,
                            subframeP,
                            S_DL_SCHEDULED);
          // store stats
          eNB->eNB_stats[CC_id].dlsch_bytes_tx+=sdu_length_total;
          eNB->eNB_stats[CC_id].dlsch_pdus_tx+=1;

          UE_list->eNB_UE_stats[CC_id][UE_id].rbs_used = nb_rb;
          UE_list->eNB_UE_stats[CC_id][UE_id].total_rbs_used += nb_rb;
          UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs1=eNB_UE_stats->dlsch_mcs1;
          UE_list->eNB_UE_stats[CC_id][UE_id].dlsch_mcs2=mcs;
          UE_list->eNB_UE_stats[CC_id][UE_id].TBS = TBS;

          UE_list->eNB_UE_stats[CC_id][UE_id].overhead_bytes= TBS- sdu_length_total;
          UE_list->eNB_UE_stats[CC_id][UE_id].total_sdu_bytes+= sdu_length_total;
          UE_list->eNB_UE_stats[CC_id][UE_id].total_pdu_bytes+= TBS;
          UE_list->eNB_UE_stats[CC_id][UE_id].total_num_pdus+=1;

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          if (cc[CC_id].tdd_Config != NULL) { // TDD
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            UE_list->UE_template[CC_id][UE_id].DAI++;
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            update_ul_dci(module_idP,CC_id,rnti,UE_list->UE_template[CC_id][UE_id].DAI,subframeP);
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          }

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	  // do PUCCH power control
          // this is the normalized RX power
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	  eNB_UE_stats =  &UE_list->eNB_UE_stats[CC_id][UE_id];
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          /* TODO: fix how we deal with power, unit is not dBm, it's special from nfapi */
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	  normalized_rx_power = ue_sched_ctl->pucch1_snr[CC_id];
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	  target_rx_power = 208;
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          // this assumes accumulated tpc
	  // make sure that we are only sending a tpc update once a frame, otherwise the control loop will freak out
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	  int32_t framex10psubframe = UE_list->UE_template[CC_id][UE_id].pucch_tpc_tx_frame*10+UE_list->UE_template[CC_id][UE_id].pucch_tpc_tx_subframe;
          if (((framex10psubframe+10)<=(frameP*10+subframeP)) || //normal case
	      ((framex10psubframe>(frameP*10+subframeP)) && (((10240-framex10psubframe+frameP*10+subframeP)>=10)))) //frame wrap-around
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	    if (ue_sched_ctl->pucch1_cqi_update[CC_id] == 1) { 
	      ue_sched_ctl->pucch1_cqi_update[CC_id] = 0;
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	      UE_list->UE_template[CC_id][UE_id].pucch_tpc_tx_frame=frameP;
	      UE_list->UE_template[CC_id][UE_id].pucch_tpc_tx_subframe=subframeP;
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	      if (normalized_rx_power>(target_rx_power+4)) {
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		tpc = 0; //-1
		tpc_accumulated--;
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	      } else if (normalized_rx_power<(target_rx_power-4)) {
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		tpc = 2; //+1
		tpc_accumulated++;
	      } else {
		tpc = 1; //0
	      }
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	      LOG_D(MAC,"[eNB %d] DLSCH scheduler: frame %d, subframe %d, harq_pid %d, tpc %d, accumulated %d, normalized/target rx power %d/%d\n",
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		    module_idP,frameP, subframeP,harq_pid,tpc,
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		    tpc_accumulated,normalized_rx_power,target_rx_power);
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	    } // Po_PUCCH has been updated 
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	    else {
	      tpc = 1; //0
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	    } // time to do TPC update 
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	  else {
	    tpc = 1; //0
	  }

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	  dl_config_pdu                                                         = &dl_req->dl_config_pdu_list[dl_req->number_pdu]; 
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	  memset((void*)dl_config_pdu,0,sizeof(nfapi_dl_config_request_pdu_t));
	  dl_config_pdu->pdu_type                                               = NFAPI_DL_CONFIG_DCI_DL_PDU_TYPE; 
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	  dl_config_pdu->pdu_size                                               = (uint8_t)(2+sizeof(nfapi_dl_config_dci_dl_pdu));
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	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.dci_format                  = NFAPI_DL_DCI_FORMAT_1;
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	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.aggregation_level           = get_aggregation(get_bw_index(module_idP,CC_id),ue_sched_ctl->dl_cqi[CC_id],format1);
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	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti                        = rnti;
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti_type                   = 1;    // CRNTI : see Table 4-10 from SCF082 - nFAPI specifications
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.transmission_power          = 6000; // equal to RS power
	  
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.harq_process                = harq_pid;
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.tpc                         = tpc; // dont adjust power when retransmitting
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.new_data_indicator_1        = 1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.mcs_1                       = mcs;
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.redundancy_version_1        = 0;
	  //deactivate second codeword
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.mcs_2                       = 0;
	  dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.redundancy_version_2        = 1;
	  if (cc[CC_id].tdd_Config != NULL) { //TDD
	    dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.downlink_assignment_index = (UE_list->UE_template[CC_id][UE_id].DAI-1)&3;
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	    LOG_D(MAC,"[eNB %d] Initial transmission CC_id %d : harq_pid %d, dai %d, mcs %d\n",
		  module_idP,CC_id,harq_pid,
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		  (UE_list->UE_template[CC_id][UE_id].DAI-1),
		  mcs);
	  } else {
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	    LOG_D(MAC,"[eNB %d] Initial transmission CC_id %d : harq_pid %d, mcs %d\n",
		  module_idP,CC_id,harq_pid,mcs);
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	  }
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	  LOG_D(MAC,"Checking feasibility pdu %d (new sdu)\n",dl_req->number_pdu);
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	  if (!CCE_allocation_infeasible(module_idP,CC_id,1,subframeP,dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.aggregation_level,rnti)) {
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	    ue_sched_ctl->round[CC_id][harq_pid] = 0;
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	    dl_req->number_dci++;
	    dl_req->number_pdu++;
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	    dl_req->tl.tag = NFAPI_DL_CONFIG_REQUEST_BODY_TAG;
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	    eNB->DL_req[CC_id].sfn_sf = frameP<<4 | subframeP;
	    eNB->DL_req[CC_id].header.message_id = NFAPI_DL_CONFIG_REQUEST;
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	    // Toggle NDI for next time
	    LOG_D(MAC,"CC_id %d Frame %d, subframeP %d: Toggling Format1 NDI for UE %d (rnti %x/%d) oldNDI %d\n",
		  CC_id, frameP,subframeP,UE_id,
		  rnti,harq_pid,UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid]);
	    
	    UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid]=1-UE_list->UE_template[CC_id][UE_id].oldNDI[harq_pid];
	    UE_list->UE_template[CC_id][UE_id].oldmcs1[harq_pid] = mcs;
	    UE_list->UE_template[CC_id][UE_id].oldmcs2[harq_pid] = 0;
	    AssertFatal(UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated!=NULL,"physicalConfigDedicated is NULL\n");
	    AssertFatal(UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->pdsch_ConfigDedicated!=NULL,"physicalConfigDedicated->pdsch_ConfigDedicated is NULL\n");
	    
	    fill_nfapi_dlsch_config(eNB,dl_req,
				    TBS,
				    eNB->pdu_index[CC_id],
				    rnti,
				    0, // type 0 allocation from 7.1.6 in 36.213
				    0, // virtual_resource_block_assignment_flag, unused here
				    0, // resource_block_coding, to be filled in later
				    getQm(mcs),
				    0, // redundancy version
				    1, // transport blocks
				    0, // transport block to codeword swap flag
				    cc[CC_id].p_eNB == 1 ? 0 : 1, // transmission_scheme
				    1, // number of layers
				    1, // number of subbands