pre_processor.c 72.7 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 pre_processor.c
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 * \brief eNB scheduler preprocessing fuction prior to scheduling
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 * \author Navid Nikaein and Ankit Bhamri
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 * \date 2013 - 2014
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 * \email navid.nikaein@eurecom.fr
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 * \version 1.0
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 * @ingroup _mac

 */

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#define _GNU_SOURCE
#include <stdlib.h>

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#include "assertions.h"
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#include "LAYER2/MAC/mac.h"
#include "LAYER2/MAC/mac_proto.h"
#include "LAYER2/MAC/mac_extern.h"
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#include "common/utils/LOG/log.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
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#include "UTIL/OPT/opt.h"
#include "OCG.h"
#include "OCG_extern.h"
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#include "RRC/LTE/rrc_extern.h"
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#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
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#include "rlc.h"
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#include "PHY/LTE_TRANSPORT/transport_common_proto.h"
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#include "common/ran_context.h"
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extern RAN_CONTEXT_t RC;
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#define DEBUG_eNB_SCHEDULER 1
#define DEBUG_HEADER_PARSING 1
//#define DEBUG_PACKET_TRACE 1

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extern float slice_percentage[MAX_NUM_SLICES];
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extern float slice_percentage_uplink[MAX_NUM_SLICES];
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extern int slice_position[MAX_NUM_SLICES*2];
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extern uint32_t sorting_policy[MAX_NUM_SLICES];
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extern int accounting_policy[MAX_NUM_SLICES];
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extern int slice_maxmcs[MAX_NUM_SLICES];
extern int slice_maxmcs_uplink[MAX_NUM_SLICES];


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//#define ICIC 0

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/* this function checks that get_eNB_UE_stats returns
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 * a non-NULL pointer for all the active CCs of an UE
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 */
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/*
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int phy_stats_exist(module_id_t Mod_id, int rnti)
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{
  int CC_id;
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  int i;
  int UE_id          = find_UE_id(Mod_id, rnti);
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  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
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  if (UE_id == -1) {
    LOG_W(MAC, "[eNB %d] UE %x not found, should be there (in phy_stats_exist)\n",
	  Mod_id, rnti);
    return 0;
  }
  if (UE_list->numactiveCCs[UE_id] == 0) {
    LOG_W(MAC, "[eNB %d] UE %x has no active CC (in phy_stats_exist)\n",
	  Mod_id, rnti);
    return 0;
  }
  for (i = 0; i < UE_list->numactiveCCs[UE_id]; i++) {
    CC_id = UE_list->ordered_CCids[i][UE_id];
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    if (mac_xface->get_eNB_UE_stats(Mod_id, CC_id, rnti) == NULL)
      return 0;
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  }
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  return 1;
}
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*/
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// This function stores the downlink buffer for all the logical channels
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void
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store_dlsch_buffer(module_id_t Mod_id, slice_id_t slice_id, frame_t frameP,
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		   sub_frame_t subframeP)
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{
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    int UE_id, i;
    rnti_t rnti;
    mac_rlc_status_resp_t rlc_status;
    UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
    UE_TEMPLATE *UE_template;
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    for (UE_id = 0; UE_id < MAX_MOBILES_PER_ENB; UE_id++) {
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	if (UE_list->active[UE_id] != TRUE)
	    continue;
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	if (!ue_slice_membership(UE_id, slice_id))
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	    continue;

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	UE_template =
	    &UE_list->UE_template[UE_PCCID(Mod_id, UE_id)][UE_id];
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	// clear logical channel interface variables
	UE_template->dl_buffer_total = 0;
	UE_template->dl_pdus_total = 0;
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	for (i = 0; i < MAX_NUM_LCID; i++) {
	    UE_template->dl_buffer_info[i] = 0;
	    UE_template->dl_pdus_in_buffer[i] = 0;
	    UE_template->dl_buffer_head_sdu_creation_time[i] = 0;
	    UE_template->dl_buffer_head_sdu_remaining_size_to_send[i] = 0;
	}
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	rnti = UE_RNTI(Mod_id, UE_id);

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        for (i = 0; i < MAX_NUM_LCID; i++) {    // loop over all the logical channels
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	    rlc_status =
		mac_rlc_status_ind(Mod_id, rnti, Mod_id, frameP, subframeP,
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				   ENB_FLAG_YES, MBMS_FLAG_NO, i, 0
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#if (RRC_VERSION >= MAKE_VERSION(14, 0, 0))
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                   ,0, 0
#endif
                   );

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	    UE_template->dl_buffer_info[i] = rlc_status.bytes_in_buffer;	//storing the dlsch buffer for each logical channel
	    UE_template->dl_pdus_in_buffer[i] = rlc_status.pdus_in_buffer;
	    UE_template->dl_buffer_head_sdu_creation_time[i] =
		rlc_status.head_sdu_creation_time;
	    UE_template->dl_buffer_head_sdu_creation_time_max =
		cmax(UE_template->dl_buffer_head_sdu_creation_time_max,
		     rlc_status.head_sdu_creation_time);
	    UE_template->dl_buffer_head_sdu_remaining_size_to_send[i] =
		rlc_status.head_sdu_remaining_size_to_send;
	    UE_template->dl_buffer_head_sdu_is_segmented[i] =
		rlc_status.head_sdu_is_segmented;
	    UE_template->dl_buffer_total += UE_template->dl_buffer_info[i];	//storing the total dlsch buffer
	    UE_template->dl_pdus_total +=
		UE_template->dl_pdus_in_buffer[i];
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#ifdef DEBUG_eNB_SCHEDULER
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	    /* note for dl_buffer_head_sdu_remaining_size_to_send[i] :
	     * 0 if head SDU has not been segmented (yet), else remaining size not already segmented and sent
	     */
	    if (UE_template->dl_buffer_info[i] > 0)
		LOG_D(MAC,
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		      "[eNB %d][SLICE %d] Frame %d Subframe %d : RLC status for UE %d in LCID%d: total of %d pdus and size %d, head sdu queuing time %d, remaining size %d, is segmeneted %d \n",
		      Mod_id, slice_id, frameP, subframeP, UE_id,
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		      i, UE_template->dl_pdus_in_buffer[i],
		      UE_template->dl_buffer_info[i],
		      UE_template->dl_buffer_head_sdu_creation_time[i],
		      UE_template->
		      dl_buffer_head_sdu_remaining_size_to_send[i],
		      UE_template->dl_buffer_head_sdu_is_segmented[i]);
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#endif
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	}
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	//#ifdef DEBUG_eNB_SCHEDULER
	if (UE_template->dl_buffer_total > 0)
	    LOG_D(MAC,
		  "[eNB %d] Frame %d Subframe %d : RLC status for UE %d : total DL buffer size %d and total number of pdu %d \n",
		  Mod_id, frameP, subframeP, UE_id,
		  UE_template->dl_buffer_total,
		  UE_template->dl_pdus_total);
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	//#endif
    }
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}

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// This function returns the estimated number of RBs required by each UE for downlink scheduling
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void
assign_rbs_required(module_id_t Mod_id,
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                    slice_id_t slice_id,
                    frame_t frameP,
                    sub_frame_t subframe,
                    int min_rb_unit[NFAPI_CC_MAX],
                    uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB])
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{
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    uint16_t TBS = 0;
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    int UE_id, n, i, j, CC_id, pCCid, tmp;
    UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
    eNB_UE_STATS *eNB_UE_stats, *eNB_UE_stats_i, *eNB_UE_stats_j;
    int N_RB_DL;
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    // clear rb allocations across all CC_id
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    for (UE_id = 0; UE_id < MAX_MOBILES_PER_ENB; UE_id++) {
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	if (UE_list->active[UE_id] != TRUE)
	    continue;
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	if (!ue_slice_membership(UE_id, slice_id))
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	    continue;
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	pCCid = UE_PCCID(Mod_id, UE_id);
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	//update CQI information across component carriers
	for (n = 0; n < UE_list->numactiveCCs[UE_id]; n++) {
	    CC_id = UE_list->ordered_CCids[n][UE_id];
	    eNB_UE_stats = &UE_list->eNB_UE_stats[CC_id][UE_id];
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	    eNB_UE_stats->dlsch_mcs1 =cmin(cqi_to_mcs[UE_list->UE_sched_ctrl[UE_id].dl_cqi[CC_id]],
									   slice_maxmcs[slice_id]);
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	}
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	// provide the list of CCs sorted according to MCS
	for (i = 0; i < UE_list->numactiveCCs[UE_id]; i++) {
	    eNB_UE_stats_i =
		&UE_list->eNB_UE_stats[UE_list->
				       ordered_CCids[i][UE_id]][UE_id];
	    for (j = i + 1; j < UE_list->numactiveCCs[UE_id]; j++) {
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		DevAssert(j < NFAPI_CC_MAX);
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		eNB_UE_stats_j =
		    &UE_list->
		    eNB_UE_stats[UE_list->ordered_CCids[j][UE_id]][UE_id];
		if (eNB_UE_stats_j->dlsch_mcs1 >
		    eNB_UE_stats_i->dlsch_mcs1) {
		    tmp = UE_list->ordered_CCids[i][UE_id];
		    UE_list->ordered_CCids[i][UE_id] =
			UE_list->ordered_CCids[j][UE_id];
		    UE_list->ordered_CCids[j][UE_id] = tmp;
		}
	    }
	}
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	if (UE_list->UE_template[pCCid][UE_id].dl_buffer_total > 0) {
	    LOG_D(MAC, "[preprocessor] assign RB for UE %d\n", UE_id);

	    for (i = 0; i < UE_list->numactiveCCs[UE_id]; i++) {
		CC_id = UE_list->ordered_CCids[i][UE_id];
		eNB_UE_stats = &UE_list->eNB_UE_stats[CC_id][UE_id];

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

		TBS =
		    get_TBS_DL(eNB_UE_stats->dlsch_mcs1,
			       nb_rbs_required[CC_id][UE_id]);

		LOG_D(MAC,
		      "[preprocessor] start RB assignement for UE %d CC_id %d dl buffer %d (RB unit %d, MCS %d, TBS %d) \n",
		      UE_id, CC_id,
		      UE_list->UE_template[pCCid][UE_id].dl_buffer_total,
		      nb_rbs_required[CC_id][UE_id],
		      eNB_UE_stats->dlsch_mcs1, TBS);

		N_RB_DL =
		    to_prb(RC.mac[Mod_id]->common_channels[CC_id].
			   mib->message.dl_Bandwidth);

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		UE_list->UE_sched_ctrl[UE_id].max_rbs_allowed_slice[CC_id][slice_id] =
                nb_rbs_allowed_slice(slice_percentage[slice_id], N_RB_DL);
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		/* calculating required number of RBs for each UE */
		while (TBS <
		       UE_list->UE_template[pCCid][UE_id].
		       dl_buffer_total) {
		    nb_rbs_required[CC_id][UE_id] += min_rb_unit[CC_id];

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		    if (nb_rbs_required[CC_id][UE_id] > UE_list->UE_sched_ctrl[UE_id].max_rbs_allowed_slice[CC_id][slice_id]) {
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			TBS = get_TBS_DL(eNB_UE_stats->dlsch_mcs1, UE_list->UE_sched_ctrl[UE_id].max_rbs_allowed_slice[CC_id][slice_id]);
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			nb_rbs_required[CC_id][UE_id] = UE_list->UE_sched_ctrl[UE_id].max_rbs_allowed_slice[CC_id][slice_id];
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			break;
		    }

		    TBS =
			get_TBS_DL(eNB_UE_stats->dlsch_mcs1,
				   nb_rbs_required[CC_id][UE_id]);
		}		// end of while

		LOG_D(MAC,
		      "[eNB %d] Frame %d: UE %d on CC %d: RB unit %d,  nb_required RB %d (TBS %d, mcs %d)\n",
		      Mod_id, frameP, UE_id, CC_id, min_rb_unit[CC_id],
		      nb_rbs_required[CC_id][UE_id], TBS,
		      eNB_UE_stats->dlsch_mcs1);
	    }
	}
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    }
}
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// This function scans all CC_ids for a particular UE to find the maximum round index of its HARQ processes
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int
maxround(module_id_t Mod_id, uint16_t rnti, int frame,
	 sub_frame_t subframe, uint8_t ul_flag)
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{
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    uint8_t round, round_max = 0, UE_id;
    int CC_id, harq_pid;
    UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
    COMMON_channels_t *cc;
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    for (CC_id = 0; CC_id < RC.nb_mac_CC[Mod_id]; CC_id++) {
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	cc = &RC.mac[Mod_id]->common_channels[CC_id];
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	UE_id = find_UE_id(Mod_id, rnti);
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	harq_pid = frame_subframe2_dl_harq_pid(cc->tdd_Config,frame ,subframe);
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	round = UE_list->UE_sched_ctrl[UE_id].round[CC_id][harq_pid];
	if (round > round_max) {
	    round_max = round;
	}
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    }
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    return round_max;
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}
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// This function scans all CC_ids for a particular UE to find the maximum DL CQI
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// it returns -1 if the UE is not found in PHY layer (get_eNB_UE_stats gives NULL)
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int maxcqi(module_id_t Mod_id, int32_t UE_id)
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{
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    UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
    int CC_id, n;
    int CQI = 0;
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    for (n = 0; n < UE_list->numactiveCCs[UE_id]; n++) {
	CC_id = UE_list->ordered_CCids[n][UE_id];
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	if (UE_list->UE_sched_ctrl[UE_id].dl_cqi[CC_id] > CQI) {
	    CQI = UE_list->UE_sched_ctrl[UE_id].dl_cqi[CC_id];
	}
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    }
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    return CQI;
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}
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struct sort_ue_dl_params {
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    int Mod_idP;
    int frameP;
    int subframeP;
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    int slice_id;
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};
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static int ue_dl_compare(const void *_a, const void *_b, void *_params)
{
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    struct sort_ue_dl_params *params = _params;
    UE_list_t *UE_list = &RC.mac[params->Mod_idP]->UE_list;

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	int i;
	int slice_id = params->slice_id;
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    int UE_id1 = *(const int *) _a;
    int UE_id2 = *(const int *) _b;

    int rnti1 = UE_RNTI(params->Mod_idP, UE_id1);
    int pCC_id1 = UE_PCCID(params->Mod_idP, UE_id1);
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    int round1 = maxround(params->Mod_idP, rnti1, params->frameP, params->subframeP, 1);
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    int rnti2 = UE_RNTI(params->Mod_idP, UE_id2);
    int pCC_id2 = UE_PCCID(params->Mod_idP, UE_id2);
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    int round2 = maxround(params->Mod_idP, rnti2, params->frameP, params->subframeP, 1);
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    int cqi1 = maxcqi(params->Mod_idP, UE_id1);
    int cqi2 = maxcqi(params->Mod_idP, UE_id2);

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  for (i = 0; i < CR_NUM; ++i) {
    switch (UE_list->sorting_criteria[slice_id][i]) {

      case CR_ROUND :
        if (round1 > round2)
          return -1;
        if (round1 < round2)
          return 1;
        break;

      case CR_SRB12 :
        if (UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_info[1] +
            UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_info[2] >
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_info[1] +
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_info[2])
          return -1;
        if (UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_info[1] +
            UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_info[2] <
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_info[1] +
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_info[2])
          return 1;
        break;

      case CR_HOL :
        if (UE_list-> UE_template[pCC_id1][UE_id1].dl_buffer_head_sdu_creation_time_max >
            UE_list-> UE_template[pCC_id2][UE_id2].dl_buffer_head_sdu_creation_time_max)
          return -1;
        if (UE_list-> UE_template[pCC_id1][UE_id1].dl_buffer_head_sdu_creation_time_max <
            UE_list-> UE_template[pCC_id2][UE_id2].dl_buffer_head_sdu_creation_time_max)
          return 1;
        break;

      case CR_LC :
        if (UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_total >
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_total)
          return -1;
        if (UE_list->UE_template[pCC_id1][UE_id1].dl_buffer_total <
            UE_list->UE_template[pCC_id2][UE_id2].dl_buffer_total)
          return 1;
        break;

      case CR_CQI :
        if (cqi1 > cqi2)
          return -1;
        if (cqi1 < cqi2)
          return 1;

      default :
        break;
    }
  }
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    return 0;
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}
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void decode_sorting_policy(module_id_t Mod_idP, slice_id_t slice_id) {
	int i;

	UE_list_t *UE_list = &RC.mac[Mod_idP]->UE_list;
	uint32_t policy = sorting_policy[slice_id];
	uint32_t mask = 0x0000000F;
    uint16_t criterion;

	for(i = 0; i < CR_NUM; ++i) {
		criterion = (uint16_t)(policy >> 4*(CR_NUM - 1 - i) & mask);
        if (criterion >= CR_NUM) {
          LOG_W(MAC, "Invalid criterion in slice %d policy, revert to default policy \n", slice_id);
          sorting_policy[slice_id] = 0x1234;
          break;
        }
      UE_list->sorting_criteria[slice_id][i] = criterion;
	}
}

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void decode_slice_positioning(module_id_t Mod_idP,
                              slice_id_t slice_id,
                              uint8_t slice_allocation_mask[NFAPI_CC_MAX][N_RBG_MAX]) {
  uint8_t CC_id;
  int RBG, start_frequency, end_frequency;

  // Init slice_alloc_mask
  for (CC_id = 0; CC_id < NFAPI_CC_MAX; ++CC_id) {
    for (RBG = 0; RBG < N_RBG_MAX; ++RBG) {
      slice_allocation_mask[CC_id][RBG] = 0;
    }
  }

  start_frequency = slice_position[slice_id*2];
  end_frequency = slice_position[slice_id*2 + 1];
  for (CC_id = 0; CC_id < NFAPI_CC_MAX; ++CC_id) {
    for (RBG = start_frequency; RBG <= end_frequency; ++RBG) {
      slice_allocation_mask[CC_id][RBG] = 1;
    }
  }
}

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// This fuction sorts the UE in order their dlsch buffer and CQI
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void sort_UEs(module_id_t Mod_idP, slice_id_t slice_id, int frameP, sub_frame_t subframeP)
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{
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  int i;
  int list[MAX_MOBILES_PER_ENB];
  int list_size = 0;
  struct sort_ue_dl_params params = {Mod_idP, frameP, subframeP, slice_id};
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  UE_list_t *UE_list = &RC.mac[Mod_idP]->UE_list;
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  for (i = 0; i < MAX_MOBILES_PER_ENB; i++) {
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    if (UE_list->active[i] == FALSE) continue;
    if (UE_RNTI(Mod_idP, i) == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(i, slice_id)) continue;
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    list[list_size] = i;
    list_size++;
  }
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  decode_sorting_policy(Mod_idP, slice_id);
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  qsort_r(list, list_size, sizeof(int), ue_dl_compare, &params);
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  if (list_size) {
    for (i = 0; i < list_size - 1; ++i)
      UE_list->next[list[i]] = list[i + 1];
    UE_list->next[list[list_size - 1]] = -1;
    UE_list->head = list[0];
  } else {
    UE_list->head = -1;
  }

#if 0


    int UE_id1, UE_id2;
    int pCC_id1, pCC_id2;
    int cqi1, cqi2, round1, round2;
    int i = 0, ii = 0;		//,j=0;
    rnti_t rnti1, rnti2;

    UE_list_t *UE_list = &RC.mac[Mod_idP]->UE_list;

    for (i = UE_list->head; i >= 0; i = UE_list->next[i]) {

	for (ii = UE_list->next[i]; ii >= 0; ii = UE_list->next[ii]) {

	    UE_id1 = i;
	    rnti1 = UE_RNTI(Mod_idP, UE_id1);
	    if (rnti1 == NOT_A_RNTI)
		continue;
	    if (UE_list->UE_sched_ctrl[UE_id1].ul_out_of_sync == 1)
		continue;
	    pCC_id1 = UE_PCCID(Mod_idP, UE_id1);
	    cqi1 = maxcqi(Mod_idP, UE_id1);	//
	    round1 = maxround(Mod_idP, rnti1, frameP, subframeP, 0);

	    UE_id2 = ii;
	    rnti2 = UE_RNTI(Mod_idP, UE_id2);
	    if (rnti2 == NOT_A_RNTI)
		continue;
	    if (UE_list->UE_sched_ctrl[UE_id2].ul_out_of_sync == 1)
		continue;
	    cqi2 = maxcqi(Mod_idP, UE_id2);
	    round2 = maxround(Mod_idP, rnti2, frameP, subframeP, 0);	//mac_xface->get_ue_active_harq_pid(Mod_id,rnti2,subframe,&harq_pid2,&round2,0);
	    pCC_id2 = UE_PCCID(Mod_idP, UE_id2);

	    if (round2 > round1) {	// Check first if one of the UEs has an active HARQ process which needs service and swap order
		swap_UEs(UE_list, UE_id1, UE_id2, 0);
	    } else if (round2 == round1) {
		// RK->NN : I guess this is for fairness in the scheduling. This doesn't make sense unless all UEs have the same configuration of logical channels.  This should be done on the sum of all information that has to be sent.  And still it wouldn't ensure fairness.  It should be based on throughput seen by each UE or maybe using the head_sdu_creation_time, i.e. swap UEs if one is waiting longer for service.
		//  for(j=0;j<MAX_NUM_LCID;j++){
		//    if (eNB_mac_inst[Mod_id][pCC_id1].UE_template[UE_id1].dl_buffer_info[j] <
		//      eNB_mac_inst[Mod_id][pCC_id2].UE_template[UE_id2].dl_buffer_info[j]){

		// first check the buffer status for SRB1 and SRB2

		if ((UE_list->UE_template[pCC_id1][UE_id1].
		     dl_buffer_info[1] +
		     UE_list->UE_template[pCC_id1][UE_id1].
		     dl_buffer_info[2]) <
		    (UE_list->UE_template[pCC_id2][UE_id2].
		     dl_buffer_info[1] +
		     UE_list->UE_template[pCC_id2][UE_id2].
		     dl_buffer_info[2])) {
		    swap_UEs(UE_list, UE_id1, UE_id2, 0);
		} else if (UE_list->UE_template[pCC_id1]
			   [UE_id1].dl_buffer_head_sdu_creation_time_max <
			   UE_list->UE_template[pCC_id2]
			   [UE_id2].dl_buffer_head_sdu_creation_time_max) {
		    swap_UEs(UE_list, UE_id1, UE_id2, 0);
		} else if (UE_list->UE_template[pCC_id1][UE_id1].
			   dl_buffer_total <
			   UE_list->UE_template[pCC_id2][UE_id2].
			   dl_buffer_total) {
		    swap_UEs(UE_list, UE_id1, UE_id2, 0);
		} else if (cqi1 < cqi2) {
		    swap_UEs(UE_list, UE_id1, UE_id2, 0);
		}
	    }
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	}
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    }
#endif
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}

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void dlsch_scheduler_pre_processor_partitioning(module_id_t Mod_id,
                                                slice_id_t slice_id,
                                                const uint8_t rbs_retx[NFAPI_CC_MAX]) {
  int UE_id, CC_id, N_RB_DL, i;
  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
  UE_sched_ctrl *ue_sched_ctl;

  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {

    if (UE_RNTI(Mod_id, UE_id) == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(UE_id, slice_id)) continue;

    ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];

    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); ++i) {
      CC_id = UE_list->ordered_CCids[i][UE_id];
      N_RB_DL = to_prb(RC.mac[Mod_id]->common_channels[CC_id].mib->message.dl_Bandwidth);
      ue_sched_ctl->max_rbs_allowed_slice[CC_id][slice_id] = nb_rbs_allowed_slice(slice_percentage[slice_id], N_RB_DL) - rbs_retx[CC_id];
    }
  }
}

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void dlsch_scheduler_pre_processor_accounting(module_id_t Mod_id,
                                              slice_id_t slice_id,
                                              frame_t frameP,
                                              sub_frame_t subframeP,
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                                              int min_rb_unit[NFAPI_CC_MAX],
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                                              uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
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                                              uint16_t nb_rbs_accounted[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB])
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{
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  int UE_id, CC_id;
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  int i;
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  rnti_t rnti;
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  uint8_t harq_pid, round;
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  uint16_t available_rbs;
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  uint8_t rbs_retx[NFAPI_CC_MAX];
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  uint16_t average_rbs_per_user[NFAPI_CC_MAX];
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  int total_ue_count[NFAPI_CC_MAX];
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  int ue_count_newtx[NFAPI_CC_MAX];
  int ue_count_retx[NFAPI_CC_MAX];
  uint8_t ue_retx_flag[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB];
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  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
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  UE_sched_ctrl *ue_sched_ctl;
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  COMMON_channels_t *cc;
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  // Reset
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  for (CC_id = 0; CC_id < RC.nb_mac_CC[Mod_id]; CC_id++) {
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    total_ue_count[CC_id] = 0;
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    ue_count_newtx[CC_id] = 0;
    ue_count_retx[CC_id] = 0;
    rbs_retx[CC_id] = 0;
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    average_rbs_per_user[CC_id] = 0;
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    for (UE_id = 0; UE_id < MAX_MOBILES_PER_ENB; ++UE_id) {
      ue_retx_flag[CC_id][UE_id] = 0;
    }
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  }
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  // Find total UE count, and account the RBs required for retransmissions
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  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
    rnti = UE_RNTI(Mod_id, UE_id);
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    if (rnti == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(UE_id, slice_id)) continue;
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    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); ++i) {
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      CC_id = UE_list->ordered_CCids[i][UE_id];
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      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
      cc = &RC.mac[Mod_id]->common_channels[CC_id];
      // TODO Can we use subframe2harqpid() here?
      if (cc->tdd_Config)
        harq_pid = ((frameP * 10) + subframeP) % 10;
      else
        harq_pid = ((frameP * 10) + subframeP) & 7;
      round = ue_sched_ctl->round[CC_id][harq_pid];

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      if (nb_rbs_required[CC_id][UE_id] > 0) {
        total_ue_count[CC_id]++;
      }
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      if (round != 8) {
        nb_rbs_required[CC_id][UE_id] = UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid];
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        rbs_retx[CC_id] += nb_rbs_required[CC_id][UE_id];
        ue_count_retx[CC_id]++;
        ue_retx_flag[CC_id][UE_id] = 1;
      } else {
        ue_count_newtx[CC_id]++;
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      }
    }
  }
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  // PARTITIONING
  // Reduces the available RBs according to slicing configuration
  dlsch_scheduler_pre_processor_partitioning(Mod_id, slice_id, rbs_retx);

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  switch (accounting_policy[slice_id]) {
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    // If greedy scheduling, try to account all the required RBs
    case 1:
      for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
        rnti = UE_RNTI(Mod_id, UE_id);
        if (rnti == NOT_A_RNTI) continue;
        if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
        if (!ue_slice_membership(UE_id, slice_id)) continue;
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        for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
          CC_id = UE_list->ordered_CCids[i][UE_id];
          nb_rbs_accounted[CC_id][UE_id] = nb_rbs_required[CC_id][UE_id];
        }
      }
      break;

    // Use the old, fair algorithm
    // Loop over all active UEs and account the avg number of RBs to each UE, based on all non-retx UEs.
    default:
      // FIXME: This is not ideal, why loop on UEs to find average_rbs_per_user[], that is per-CC?
      // TODO: Look how to loop on active CCs only without using the UE_num_active_CC() function.
      for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
        rnti = UE_RNTI(Mod_id, UE_id);

        if (rnti == NOT_A_RNTI) continue;
        if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
        if (!ue_slice_membership(UE_id, slice_id)) continue;

        for (i = 0; i < UE_num_active_CC(UE_list, UE_id); ++i) {
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          CC_id = UE_list->ordered_CCids[i][UE_id];
          ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
          available_rbs = ue_sched_ctl->max_rbs_allowed_slice[CC_id][slice_id];

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          if (ue_count_newtx[CC_id] == 0) {
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            average_rbs_per_user[CC_id] = 0;
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          } else if (min_rb_unit[CC_id]*ue_count_newtx[CC_id] <= available_rbs) {
            average_rbs_per_user[CC_id] = (uint16_t)floor(available_rbs/ue_count_newtx[CC_id]);
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          } else {
            // consider the total number of use that can be scheduled UE
            average_rbs_per_user[CC_id] = (uint16_t)min_rb_unit[CC_id];
          }
        }
      }
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      // note: nb_rbs_required is assigned according to total_buffer_dl
      // extend nb_rbs_required to capture per LCID RB required
      for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
        rnti = UE_RNTI(Mod_id, UE_id);
        if (rnti == NOT_A_RNTI) continue;
        if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
        if (!ue_slice_membership(UE_id, slice_id)) continue;

        for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
          CC_id = UE_list->ordered_CCids[i][UE_id];
          nb_rbs_accounted[CC_id][UE_id] = cmin(average_rbs_per_user[CC_id], nb_rbs_required[CC_id][UE_id]);
        }
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      }
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      break;
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  }
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  // Check retransmissions
  // TODO: Do this once at the beginning
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  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
    rnti = UE_RNTI(Mod_id, UE_id);
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    if (rnti == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(UE_id, slice_id)) continue;
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    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
      CC_id = UE_list->ordered_CCids[i][UE_id];
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      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
      cc = &RC.mac[Mod_id]->common_channels[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];

      // control channel or retransmission
      /* TODO: do we have to check for retransmission? */
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      if (mac_eNB_get_rrc_status(Mod_id, rnti) < RRC_RECONFIGURED || round != 8) {
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        nb_rbs_accounted[CC_id][UE_id] = nb_rbs_required[CC_id][UE_id];
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      }
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    }
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  }
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}

void dlsch_scheduler_pre_processor_positioning(module_id_t Mod_id,
                                               slice_id_t slice_id,
                                               int min_rb_unit[NFAPI_CC_MAX],
                                               uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
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                                               uint16_t nb_rbs_accounted[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
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                                               uint16_t nb_rbs_remaining[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
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                                               uint8_t rballoc_sub[NFAPI_CC_MAX][N_RBG_MAX],
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                                               uint8_t MIMO_mode_indicator[NFAPI_CC_MAX][N_RBG_MAX])
{
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  int UE_id, CC_id;
  int i;
  uint8_t transmission_mode;

  uint8_t slice_allocation_mask[NFAPI_CC_MAX][N_RBG_MAX];
  int N_RBG[NFAPI_CC_MAX];

  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;

  decode_slice_positioning(Mod_id, slice_id, slice_allocation_mask);
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  for (CC_id = 0; CC_id < RC.nb_mac_CC[Mod_id]; CC_id++) {
    COMMON_channels_t *cc = &RC.mac[Mod_id]->common_channels[CC_id];
    N_RBG[CC_id] = to_rbg(cc->mib->message.dl_Bandwidth);
  }
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  // Try to allocate accounted RBs
  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
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    if (UE_RNTI(Mod_id, UE_id) == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(UE_id, slice_id)) continue;
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    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
      CC_id = UE_list->ordered_CCids[i][UE_id];
      nb_rbs_remaining[CC_id][UE_id] = nb_rbs_accounted[CC_id][UE_id];
      transmission_mode = get_tmode(Mod_id, CC_id, UE_id);

      if (nb_rbs_required[CC_id][UE_id] > 0)
        LOG_D(MAC,
              "Step 1: nb_rbs_remaining[%d][%d]= %d (accounted %d, required %d,  pre_nb_available_rbs %d, N_RBG %d, rb_unit %d)\n",
              CC_id,
              UE_id,
              nb_rbs_remaining[CC_id][UE_id],
              nb_rbs_accounted[CC_id][UE_id],
              nb_rbs_required[CC_id][UE_id],
              UE_list->UE_sched_ctrl[UE_id].pre_nb_available_rbs[CC_id],
              N_RBG[CC_id],
              min_rb_unit[CC_id]);

      LOG_T(MAC, "calling dlsch_scheduler_pre_processor_allocate .. \n ");
      dlsch_scheduler_pre_processor_allocate(Mod_id,
                                             UE_id,
                                             CC_id,
                                             N_RBG[CC_id],
                                             min_rb_unit[CC_id],
                                             nb_rbs_required,
                                             nb_rbs_remaining,
                                             rballoc_sub,
                                             slice_allocation_mask,
                                             MIMO_mode_indicator);
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#ifdef TM5
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      // data chanel TM5: to be revisited
        if ((round == 0) &&
        (transmission_mode == 5) &&
        (ue_sched_ctl->dl_pow_off[CC_id] != 1)) {

        for (j = 0; j < N_RBG[CC_id]; j += 2) {

            if ((((j == (N_RBG[CC_id] - 1))
              && (rballoc_sub[CC_id][j] == 0)
              && (ue_sched_ctl->
                  rballoc_sub_UE[CC_id][j] == 0))
             || ((j < (N_RBG[CC_id] - 1))
                 && (rballoc_sub[CC_id][j + 1] == 0)
                 &&
                 (ue_sched_ctl->rballoc_sub_UE
                  [CC_id][j + 1] == 0)))
            && (nb_rbs_remaining[CC_id][UE_id]
                > 0)) {

            for (i = UE_list->next[UE_id + 1]; i >= 0;
                 i = UE_list->next[i]) {

                UE_id2 = i;
                rnti2 = UE_RNTI(Mod_id, UE_id2);
                ue_sched_ctl2 =
                &UE_list->UE_sched_ctrl[UE_id2];
                round2 = ue_sched_ctl2->round[CC_id];
                if (rnti2 == NOT_A_RNTI)
                continue;
                if (UE_list->
                UE_sched_ctrl
                [UE_id2].ul_out_of_sync == 1)
                continue;

                eNB_UE_stats2 =
                UE_list->
                eNB_UE_stats[CC_id][UE_id2];
                //mac_xface->get_ue_active_harq_pid(Mod_id,CC_id,rnti2,frameP,subframeP,&harq_pid2,&round2,0);

                if ((mac_eNB_get_rrc_status
                 (Mod_id,
                  rnti2) >= RRC_RECONFIGURED)
                && (round2 == 0)
                &&
                (get_tmode(Mod_id, CC_id, UE_id2)
                 == 5)
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                && (ue_sched_ctl->
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                    dl_pow_off[CC_id] != 1)) {

                if ((((j == (N_RBG[CC_id] - 1))
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                      &&
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                      (ue_sched_ctl->rballoc_sub_UE
                       [CC_id][j] == 0))
                     || ((j < (N_RBG[CC_id] - 1))
                     &&
                     (ue_sched_ctl->
                      rballoc_sub_UE[CC_id][j +
                                1]
                      == 0)))
                    &&
                    (nb_rbs_remaining
                     [CC_id]
                     [UE_id2] > 0)) {

                    if ((((eNB_UE_stats2->
                       DL_pmi_single ^
                       eNB_UE_stats1->
                       DL_pmi_single)
                      << (14 - j)) & 0xc000) == 0x4000) {	//MU-MIMO only for 25 RBs configuration

                    rballoc_sub[CC_id][j] = 1;
                    ue_sched_ctl->
                        rballoc_sub_UE[CC_id]
                        [j] = 1;
                    ue_sched_ctl2->
                        rballoc_sub_UE[CC_id]
                        [j] = 1;
                    MIMO_mode_indicator[CC_id]
                        [j] = 0;

                    if (j < N_RBG[CC_id] - 1) {
                        rballoc_sub[CC_id][j +
                                   1] =
                        1;
                        ue_sched_ctl->
                        rballoc_sub_UE
                        [CC_id][j + 1] = 1;
                        ue_sched_ctl2->rballoc_sub_UE
                        [CC_id][j + 1] = 1;
                        MIMO_mode_indicator
                        [CC_id][j + 1]
                        = 0;
                    }

                    ue_sched_ctl->
                        dl_pow_off[CC_id]
                        = 0;
                    ue_sched_ctl2->
                        dl_pow_off[CC_id]
                        = 0;


                    if ((j == N_RBG[CC_id] - 1)
                        && ((N_RB_DL == 25)
                        || (N_RB_DL ==
                            50))) {

                        nb_rbs_remaining
                        [CC_id][UE_id] =
                        nb_rbs_remaining
                        [CC_id][UE_id] -
                        min_rb_unit[CC_id]
                        + 1;
                        ue_sched_ctl->pre_nb_available_rbs
                        [CC_id] =
                        ue_sched_ctl->pre_nb_available_rbs
                        [CC_id] +
                        min_rb_unit[CC_id]
                        - 1;
                        nb_rbs_remaining
                        [CC_id][UE_id2] =
                        nb_rbs_remaining
                        [CC_id][UE_id2] -
                        min_rb_unit[CC_id]
                        + 1;
                        ue_sched_ctl2->pre_nb_available_rbs
                        [CC_id] =
                        ue_sched_ctl2->pre_nb_available_rbs
                        [CC_id] +
                        min_rb_unit[CC_id]
                        - 1;
                    } else {

                        nb_rbs_remaining
                        [CC_id][UE_id] =
                        nb_rbs_remaining
                        [CC_id][UE_id] - 4;
                        ue_sched_ctl->pre_nb_available_rbs
                        [CC_id] =
                        ue_sched_ctl->pre_nb_available_rbs
                        [CC_id] + 4;
                        nb_rbs_remaining
                        [CC_id][UE_id2] =
                        nb_rbs_remaining
                        [CC_id][UE_id2] -
                        4;
                        ue_sched_ctl2->pre_nb_available_rbs
                        [CC_id] =
                        ue_sched_ctl2->pre_nb_available_rbs
                        [CC_id] + 4;
                    }

                    break;
                    }
                }
                }
            }
            }
        }
        }
994
#endif
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    }
  }
}

void dlsch_scheduler_pre_processor_intraslice_sharing(module_id_t Mod_id,
                                                      slice_id_t slice_id,
                                                      int min_rb_unit[NFAPI_CC_MAX],
                                                      uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                                      uint16_t nb_rbs_accounted[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                                      uint16_t nb_rbs_remaining[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                                      uint8_t rballoc_sub[NFAPI_CC_MAX][N_RBG_MAX],
                                                      uint8_t MIMO_mode_indicator[NFAPI_CC_MAX][N_RBG_MAX]) {

  int UE_id, CC_id;
  int i;
  uint8_t transmission_mode;
  uint8_t slice_allocation_mask[NFAPI_CC_MAX][N_RBG_MAX];
  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
  int N_RBG[NFAPI_CC_MAX];

  decode_slice_positioning(Mod_id, slice_id, slice_allocation_mask);

  for (CC_id = 0; CC_id < RC.nb_mac_CC[Mod_id]; CC_id++) {
    COMMON_channels_t *cc = &RC.mac[Mod_id]->common_channels[CC_id];
    N_RBG[CC_id] = to_rbg(cc->mib->message.dl_Bandwidth);
  }

  // Remaining RBs are allocated to high priority UEs
  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {

    if (UE_RNTI(Mod_id, UE_id) == NOT_A_RNTI) continue;
    if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1) continue;
    if (!ue_slice_membership(UE_id, slice_id)) continue;

    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
      CC_id = UE_list->ordered_CCids[i][UE_id];
      nb_rbs_remaining[CC_id][UE_id] =
              nb_rbs_required[CC_id][UE_id] - nb_rbs_accounted[CC_id][UE_id] + nb_rbs_remaining[CC_id][UE_id];
      if (nb_rbs_remaining[CC_id][UE_id] < 0)
        abort();
      transmission_mode = get_tmode(Mod_id, CC_id, UE_id);

      if (nb_rbs_required[CC_id][UE_id] > 0)
        LOG_D(MAC,
              "Step 2: nb_rbs_remaining[%d][%d]= %d (accounted %d, required %d,  pre_nb_available_rbs %d, N_RBG %d, rb_unit %d)\n",
              CC_id,
              UE_id,
              nb_rbs_remaining[CC_id][UE_id],
              nb_rbs_accounted[CC_id][UE_id],
              nb_rbs_required[CC_id][UE_id],
              UE_list->UE_sched_ctrl[UE_id].pre_nb_available_rbs[CC_id],
              N_RBG[CC_id],
              min_rb_unit[CC_id]);

      LOG_T(MAC, "calling dlsch_scheduler_pre_processor_allocate .. \n ");
      dlsch_scheduler_pre_processor_allocate(Mod_id,
                                             UE_id,
                                             CC_id,
                                             N_RBG[CC_id],
                                             min_rb_unit[CC_id],
                                             nb_rbs_required,
                                             nb_rbs_remaining,
                                             rballoc_sub,
                                             slice_allocation_mask,
                                             MIMO_mode_indicator);

#ifdef TM5
      // data chanel TM5: to be revisited
    if ((round == 0) &&
    (transmission_mode == 5) &&
    (ue_sched_ctl->dl_pow_off[CC_id] != 1)) {

    for (j = 0; j < N_RBG[CC_id]; j += 2) {

        if ((((j == (N_RBG[CC_id] - 1))
          && (rballoc_sub[CC_id][j] == 0)
          && (ue_sched_ctl->
              rballoc_sub_UE[CC_id][j] == 0))
         || ((j < (N_RBG[CC_id] - 1))
             && (rballoc_sub[CC_id][j + 1] == 0)
             &&
             (ue_sched_ctl->rballoc_sub_UE
              [CC_id][j + 1] == 0)))
        && (nb_rbs_remaining[CC_id][UE_id]
            > 0)) {

        for (i = UE_list->next[UE_id + 1]; i >= 0;
             i = UE_list->next[i]) {

            UE_id2 = i;
            rnti2 = UE_RNTI(Mod_id, UE_id2);
            ue_sched_ctl2 =
            &UE_list->UE_sched_ctrl[UE_id2];
            round2 = ue_sched_ctl2->round[CC_id];
            if (rnti2 == NOT_A_RNTI)
            continue;
            if (UE_list->
            UE_sched_ctrl
            [UE_id2].ul_out_of_sync == 1)
            continue;

            eNB_UE_stats2 =
            UE_list->
            eNB_UE_stats[CC_id][UE_id2];
            //mac_xface->get_ue_active_harq_pid(Mod_id,CC_id,rnti2,frameP,subframeP,&harq_pid2,&round2,0);

            if ((mac_eNB_get_rrc_status
             (Mod_id,
              rnti2) >= RRC_RECONFIGURED)
            && (round2 == 0)
            &&
            (get_tmode(Mod_id, CC_id, UE_id2)
             == 5)
            && (ue_sched_ctl->
                dl_pow_off[CC_id] != 1)) {

            if ((((j == (N_RBG[CC_id] - 1))
                  &&
                  (ue_sched_ctl->rballoc_sub_UE
                   [CC_id][j] == 0))
                 || ((j < (N_RBG[CC_id] - 1))
                 &&
                 (ue_sched_ctl->
                  rballoc_sub_UE[CC_id][j +
                            1]
                  == 0)))
                &&
                (nb_rbs_remaining
                 [CC_id]
                 [UE_id2] > 0)) {

                if ((((eNB_UE_stats2->
                   DL_pmi_single ^
                   eNB_UE_stats1->
                   DL_pmi_single)
                  << (14 - j)) & 0xc000) == 0x4000) {	//MU-MIMO only for 25 RBs configuration

                rballoc_sub[CC_id][j] = 1;
                ue_sched_ctl->
                    rballoc_sub_UE[CC_id]
                    [j] = 1;
                ue_sched_ctl2->
                    rballoc_sub_UE[CC_id]
                    [j] = 1;
                MIMO_mode_indicator[CC_id]
                    [j] = 0;

                if (j < N_RBG[CC_id] - 1) {
                    rballoc_sub[CC_id][j +
                               1] =
                    1;
                    ue_sched_ctl->
                    rballoc_sub_UE
                    [CC_id][j + 1] = 1;
                    ue_sched_ctl2->rballoc_sub_UE
                    [CC_id][j + 1] = 1;
                    MIMO_mode_indicator
                    [CC_id][j + 1]
                    = 0;
                }

                ue_sched_ctl->
                    dl_pow_off[CC_id]
                    = 0;
                ue_sched_ctl2->
                    dl_pow_off[CC_id]
                    = 0;


                if ((j == N_RBG[CC_id] - 1)
                    && ((N_RB_DL == 25)
                    || (N_RB_DL ==
                        50))) {

                    nb_rbs_remaining
                    [CC_id][UE_id] =
                    nb_rbs_remaining
                    [CC_id][UE_id] -
                    min_rb_unit[CC_id]
                    + 1;
                    ue_sched_ctl->pre_nb_available_rbs
                    [CC_id] =
                    ue_sched_ctl->pre_nb_available_rbs
                    [CC_id] +
                    min_rb_unit[CC_id]
                    - 1;
                    nb_rbs_remaining
                    [CC_id][UE_id2] =
                    nb_rbs_remaining
                    [CC_id][UE_id2] -
                    min_rb_unit[CC_id]
                    + 1;
                    ue_sched_ctl2->pre_nb_available_rbs
                    [CC_id] =
                    ue_sched_ctl2->pre_nb_available_rbs
                    [CC_id] +
                    min_rb_unit[CC_id]
                    - 1;
                } else {

                    nb_rbs_remaining
                    [CC_id][UE_id] =
                    nb_rbs_remaining
                    [CC_id][UE_id] - 4;
                    ue_sched_ctl->pre_nb_available_rbs
                    [CC_id] =
                    ue_sched_ctl->pre_nb_available_rbs
                    [CC_id] + 4;
                    nb_rbs_remaining
                    [CC_id][UE_id2] =
                    nb_rbs_remaining
                    [CC_id][UE_id2] -
                    4;
                    ue_sched_ctl2->pre_nb_available_rbs
                    [CC_id] =
                    ue_sched_ctl2->pre_nb_available_rbs
                    [CC_id] + 4;
                }

                break;
                }
            }
            }
        }
        }
    }
    }
#endif
    }
  }
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}
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// This function assigns pre-available RBS to each UE in specified sub-bands before scheduling is done
void
dlsch_scheduler_pre_processor(module_id_t Mod_id,
                              slice_id_t slice_id,
                              frame_t frameP,
                              sub_frame_t subframeP,
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                              int *mbsfn_flag)
{
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  int UE_id;
  uint8_t CC_id;
  uint16_t i, j;
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  uint8_t rballoc_sub[NFAPI_CC_MAX][N_RBG_MAX];
  uint8_t MIMO_mode_indicator[NFAPI_CC_MAX][N_RBG_MAX]; // If TM5 is revisited, we can move this inside accounting
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  int min_rb_unit[NFAPI_CC_MAX];
  uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB];
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  uint16_t nb_rbs_accounted[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB];
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  uint16_t nb_rbs_remaining[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB];
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  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
  UE_sched_ctrl *ue_sched_ctl;
//  int rrc_status = RRC_IDLE;
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#ifdef TM5
  int harq_pid1 = 0;
  int round1 = 0, round2 = 0;
  int UE_id2;
  uint16_t i1, i2, i3;
  rnti_t rnti1, rnti2;
  LTE_eNB_UE_stats *eNB_UE_stats1 = NULL;
  LTE_eNB_UE_stats *eNB_UE_stats2 = NULL;
  UE_sched_ctrl *ue_sched_ctl1, *ue_sched_ctl2;
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#endif
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  // Initialize scheduling information for all active UEs
  dlsch_scheduler_pre_processor_reset(Mod_id, slice_id, frameP, subframeP,
                                      min_rb_unit,
                                      nb_rbs_required,
                                      rballoc_sub,
                                      MIMO_mode_indicator,
                                      mbsfn_flag); // TODO Not sure if useful
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  // STATUS
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  // Store the DLSCH buffer for each logical channel
  store_dlsch_buffer(Mod_id, slice_id, frameP, subframeP);
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  // Calculate the number of RBs required by each UE on the basis of logical channel's buffer
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  assign_rbs_required(Mod_id, slice_id, frameP, subframeP,
                      min_rb_unit,
                      nb_rbs_required);
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  // Sorts the user on the basis of dlsch logical channel buffer and CQI
  sort_UEs(Mod_id, slice_id, frameP, subframeP);
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  // ACCOUNTING
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  // This procedure decides the number of RBs to allocate
  dlsch_scheduler_pre_processor_accounting(Mod_id, slice_id, frameP, subframeP,
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                                           min_rb_unit,
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                                           nb_rbs_required,
                                           nb_rbs_accounted);
  // POSITIONING
  // This procedure does the main allocation of the RBs
  dlsch_scheduler_pre_processor_positioning(Mod_id, slice_id,
                                            min_rb_unit,
                                            nb_rbs_required,
                                            nb_rbs_accounted,
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                                            nb_rbs_remaining,
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                                            rballoc_sub,
                                            MIMO_mode_indicator);
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  // SHARING
  // If there are available RBs left in the slice, allocate them to the highest priority UEs
  dlsch_scheduler_pre_processor_intraslice_sharing(Mod_id, slice_id,
                                                   min_rb_unit,
                                                   nb_rbs_required,
                                                   nb_rbs_accounted,
                                                   nb_rbs_remaining,
                                                   rballoc_sub,
                                                   MIMO_mode_indicator);

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#ifdef TM5
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  // This has to be revisited!!!!
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  for (CC_id = 0; CC_id < RC.nb_mac_CC[Mod_id]; CC_id++) {
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    COMMON_channels_t *cc = &RC.mac[Mod_id]->common_channels[CC_id];
    int N_RBG = to_rbg(cc->mib->message.dl_Bandwidth);
    i1 = 0;
    i2 = 0;
    i3 = 0;
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    for (j = 0; j < N_RBG; j++) {
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      if (MIMO_mode_indicator[CC_id][j] == 2) {
      i1 = i1 + 1;
      } else if (MIMO_mode_indicator[CC_id][j] == 1) {
      i2 = i2 + 1;
      } else if (MIMO_mode_indicator[CC_id][j] == 0) {
      i3 = i3 + 1;
      }
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    }
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    if ((i1 < N_RBG) && (i2 > 0) && (i3 == 0)) {
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      PHY_vars_eNB_g[Mod_id][CC_id]->check_for_SUMIMO_transmissions =
      PHY_vars_eNB_g[Mod_id][CC_id]->
      check_for_SUMIMO_transmissions + 1;
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    }
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    if (i3 == N_RBG && i1 == 0 && i2 == 0) {
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      PHY_vars_eNB_g[Mod_id][CC_id]->FULL_MUMIMO_transmissions =
      PHY_vars_eNB_g[Mod_id][CC_id]->FULL_MUMIMO_transmissions +
      1;
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    }
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    if ((i1 < N_RBG) && (i3 > 0)) {
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      PHY_vars_eNB_g[Mod_id][CC_id]->check_for_MUMIMO_transmissions =
      PHY_vars_eNB_g[Mod_id][CC_id]->
      check_for_MUMIMO_transmissions + 1;
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    }
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    PHY_vars_eNB_g[Mod_id][CC_id]->check_for_total_transmissions =
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      PHY_vars_eNB_g[Mod_id][CC_id]->check_for_total_transmissions +
      1;
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  }
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#endif

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  for (UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
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    ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
    for (i = 0; i < UE_num_active_CC(UE_list, UE_id); i++) {
      CC_id = UE_list->ordered_CCids[i][UE_id];
      //PHY_vars_eNB_g[Mod_id]->mu_mimo_mode[UE_id].dl_pow_off = dl_pow_off[UE_id];
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      COMMON_channels_t *cc = &RC.mac[Mod_id]->common_channels[CC_id];
      int N_RBG = to_rbg(cc->mib->message.dl_Bandwidth);
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      if (ue_sched_ctl->pre_nb_available_rbs[CC_id] > 0) {
        LOG_D(MAC, "******************DL Scheduling Information for UE%d ************************\n", UE_id);
        LOG_D(MAC, "dl power offset UE%d = %d \n", UE_id, ue_sched_ctl->dl_pow_off[CC_id]);
        LOG_D(MAC, "***********RB Alloc for every subband for UE%d ***********\n", UE_id);
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        for (j = 0; j < N_RBG; j++) {
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          //PHY_vars_eNB_g[Mod_id]->mu_mimo_mode[UE_id].rballoc_sub[UE_id] = rballoc_sub_UE[CC_id][UE_id][UE_id];
          LOG_D(MAC, "RB Alloc for UE%d and Subband%d = %d\n", UE_id, j, ue_sched_ctl->rballoc_sub_UE[CC_id][j]);
        }

        //PHY_vars_eNB_g[Mod_id]->mu_mimo_mode[UE_id].pre_nb_available_rbs = pre_nb_available_rbs[CC_id][UE_id];
        LOG_D(MAC, "[eNB %d][SLICE %d]Total RBs allocated for UE%d = %d\n",
              Mod_id, slice_id, UE_id, ue_sched_ctl->pre_nb_available_rbs[CC_id]);
      }
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    }
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  }
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}

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#define SF0_LIMIT 1
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void
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dlsch_scheduler_pre_processor_reset(module_id_t module_idP,
                                    slice_id_t slice_id,
                                    frame_t frameP,
                                    sub_frame_t subframeP,
                                    int min_rb_unit[NFAPI_CC_MAX],
                                    uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                    unsigned char rballoc_sub[NFAPI_CC_MAX][N_RBG_MAX],
                                    unsigned char MIMO_mode_indicator[NFAPI_CC_MAX][N_RBG_MAX],
                                    int *mbsfn_flag)
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{
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  int UE_id;
  uint8_t CC_id;
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  int i, j;
  UE_list_t *UE_list = &RC.mac[module_idP]->UE_list;
  UE_sched_ctrl *ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
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  int N_RB_DL, RBGsize, RBGsize_last;
  int N_RBG[NFAPI_CC_MAX];
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#ifdef SF0_LIMIT
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  int sf0_lower, sf0_upper;
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#endif
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  rnti_t rnti;
  UE_list_t *UE_list;
  UE_sched_ctrl *ue_sched_ctl;
  uint8_t *vrb_map;
  COMMON_channels_t *cc;
//
  for (CC_id = 0; CC_id < NFAPI_CC_MAX; CC_id++) {

    LOG_D(MAC, "Running preprocessor for UE %d (%x)\n", UE_id,(int)(UE_RNTI(module_idP, UE_id)));
    // initialize harq_pid and round
    cc = &RC.mac[module_idP]->common_channels[CC_id];
    N_RBG[CC_id] = to_rbg(cc->mib->message.dl_Bandwidth);
    min_rb_unit[CC_id] = get_min_rb_unit(module_idP, CC_id);

    if (mbsfn_flag[CC_id] > 0)    // If this CC is allocated for MBSFN skip it here
      continue;

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


      UE_list = &RC.mac[module_idP]->UE_list;
      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
      rnti = UE_RNTI(module_idP, UE_id);
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      if (rnti == NOT_A_RNTI)
        continue;

      if (UE_list->active[UE_id] != TRUE)
        continue;

      if (!ue_slice_membership(UE_id, slice_id))
        continue;

      vrb_map = RC.mac[module_idP]->common_channels[CC_id].vrb_map;
      N_RB_DL = to_prb(RC.mac[module_idP]->common_channels[CC_id].mib->message.dl_Bandwidth);
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#ifdef SF0_LIMIT
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      sf0_lower = -1;
      sf0_upper = -1;
#endif

      LOG_D(MAC, "Running preprocessor for UE %d (%x)\n", UE_id, rnti);
      // initialize harq_pid and round
      if (ue_sched_ctl->ta_timer)
        ue_sched_ctl->ta_timer--;


      /*
         eNB_UE_stats *eNB_UE_stats;

         if (eNB_UE_stats == NULL)
         return;


         mac_xface->get_ue_active_harq_pid(module_idP,CC_id,rnti,
         frameP,subframeP,
         &ue_sched_ctl->harq_pid[CC_id],
         &ue_sched_ctl->round[CC_id],
         openair_harq_DL);


         if (ue_sched_ctl->ta_timer == 0) {

         // WE SHOULD PROTECT the eNB_UE_stats with a mutex here ...

         ue_sched_ctl->ta_timer = 20;  // wait 20 subframes before taking TA measurement from PHY
         switch (N_RB_DL) {
         case 6:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update;
         break;

         case 15:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/2;
         break;

         case 25:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/4;
         break;

         case 50:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/8;
         break;

         case 75:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/12;
         break;

         case 100:
         ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/16;
         break;
         }
         // clear the update in case PHY does not have a new measurement after timer expiry
         eNB_UE_stats->timing_advance_update =  0;
         }
         else {
         ue_sched_ctl->ta_timer--;
         ue_sched_ctl->ta_update =0; // don't trigger a timing advance command
         }


         if (UE_id==0) {
         VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME(VCD_SIGNAL_DUMPER_VARIABLES_UE0_TIMING_ADVANCE,ue_sched_ctl->ta_update);
         }
       */

      nb_rbs_required[CC_id][UE_id] = 0;
      ue_sched_ctl->pre_nb_available_rbs[CC_id] = 0;
      ue_sched_ctl->dl_pow_off[CC_id] = 2;

      switch (N_RB_DL) {
        case 6:
          RBGsize = 1;
          RBGsize_last = 1;
          break;
        case 15:
          RBGsize = 2;
          RBGsize_last = 1;
          break;
        case 25:
          RBGsize = 2;
          RBGsize_last = 1;
          break;
        case 50:
          RBGsize = 3;
          RBGsize_last = 2;
          break;
        case 75:
          RBGsize = 4;
          RBGsize_last = 3;
          break;
        case 100:
          RBGsize = 4;
          RBGsize_last = 4;
          break;
        default:
          AssertFatal(1 == 0, "unsupported RBs (%d)\n", N_RB_DL);
      }

#ifdef SF0_LIMIT
      switch (N_RBG[CC_id]) {
        case 6:
          sf0_lower = 0;
          sf0_upper = 5;
          break;
        case 8:
          sf0_lower = 2;
          sf0_upper = 5;
          break;
        case 13:
          sf0_lower = 4;
          sf0_upper = 7;
          break;
        case 17:
          sf0_lower = 7;
          sf0_upper = 9;
          break;
        case 25:
          sf0_lower = 11;
          sf0_upper = 13;
          break;
        default:
          AssertFatal(1 == 0, "unsupported RBs (%d)\n", N_RB_DL);
      }
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#endif
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      // Initialize Subbands according to VRB map
      for (i = 0; i < N_RBG[CC_id]; i++) {
        int rb_size = i == N_RBG[CC_id] - 1 ? RBGsize_last : RBGsize;
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        ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 0;
        rballoc_sub[CC_id][i] = 0;
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#ifdef SF0_LIMIT
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        // for avoiding 6+ PRBs around DC in subframe 0 (avoid excessive errors)
        /* TODO: make it proper - allocate those RBs, do not "protect" them, but
         * compute number of available REs and limit MCS according to the
         * TBS table 36.213 7.1.7.2.1-1 (can be done after pre-processor)
         */
        if (subframeP == 0 && i >= sf0_lower && i <= sf0_upper)
          rballoc_sub[CC_id][i] = 1;
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#endif
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        // for SI-RNTI,RA-RNTI and P-RNTI allocations
        for (j = 0; j < rb_size; j++) {
          if (vrb_map[j + (i*RBGsize)] != 0) {
            rballoc_sub[CC_id][i] = 1;
            LOG_D(MAC, "Frame %d, subframe %d : vrb %d allocated\n", frameP, subframeP, j + (i*RBGsize));
            break;
          }
        }
        LOG_D(MAC, "Frame %d Subframe %d CC_id %d RBG %i : rb_alloc %d\n",
              frameP, subframeP, CC_id, i, rballoc_sub[CC_id][i]);
        MIMO_mode_indicator[CC_id][i] = 2;
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      }
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    }
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  }
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}


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void
dlsch_scheduler_pre_processor_allocate(module_id_t Mod_id,
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                                       int UE_id,
                                       uint8_t CC_id,
                                       int N_RBG,
                                       int min_rb_unit,
                                       uint16_t nb_rbs_required[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                       uint16_t nb_rbs_remaining[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
                                       unsigned char rballoc_sub[NFAPI_CC_MAX][N_RBG_MAX],
                                       uint8_t slice_allocation_mask[NFAPI_CC_MAX][N_RBG_MAX],
                                       unsigned char MIMO_mode_indicator[NFAPI_CC_MAX][N_RBG_MAX])
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{
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  int i;
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  int tm = get_tmode(Mod_id, CC_id, UE_id);
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  UE_list_t *UE_list = &RC.mac[Mod_id]->UE_list;
  UE_sched_ctrl *ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
  int N_RB_DL = to_prb(RC.mac[Mod_id]->common_channels[CC_id].mib->message.dl_Bandwidth);

  for (i = 0; i < N_RBG; i++) {

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    if (rballoc_sub[CC_id][i] != 0) continue;
    if (ue_sched_ctl->rballoc_sub_UE[CC_id][i] != 0) continue;
    if (nb_rbs_remaining[CC_id][UE_id] <= 0) continue;
    if (ue_sched_ctl->pre_nb_available_rbs[CC_id] >= nb_rbs_required[CC_id][UE_id]) continue;
    if (ue_sched_ctl->dl_pow_off[CC_id] == 0) continue;
    if (slice_allocation_mask[CC_id][i] == 0) continue;
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    if ((i == N_RBG - 1) && ((N_RB_DL == 25) || (N_RB_DL == 50))) {
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      // Allocating last, smaller RBG
      if (nb_rbs_remaining[CC_id][UE_id] >= min_rb_unit - 1) {
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        rballoc_sub[CC_id][i] = 1;
        ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 1;
        MIMO_mode_indicator[CC_id][i] = 1;
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        if (tm == 5) {
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          ue_sched_ctl->dl_pow_off[CC_id] = 1;
        }
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        nb_rbs_remaining[CC_id][UE_id] = nb_rbs_remaining[CC_id][UE_id] - min_rb_unit + 1;
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        ue_sched_ctl->pre_nb_available_rbs[CC_id] = ue_sched_ctl->pre_nb_available_rbs[CC_id] + min_rb_unit - 1;
      }
    } else {
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      // Allocating a standard-sized RBG
      if (nb_rbs_remaining[CC_id][UE_id] >= min_rb_unit) {
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        rballoc_sub[CC_id][i] = 1;
        ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 1;
        MIMO_mode_indicator[CC_id][i] = 1;
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        if (tm == 5) {
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          ue_sched_ctl->dl_pow_off[CC_id] = 1;
        }
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        nb_rbs_remaining[CC_id][UE_id] = nb_rbs_remaining[CC_id][UE_id] - min_rb_unit;
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        ue_sched_ctl->pre_nb_available_rbs[CC_id] = ue_sched_ctl->pre_nb_available_rbs[CC_id] + min_rb_unit;
      }
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    }
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  }
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}


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/// ULSCH PRE_PROCESSOR
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void ulsch_scheduler_pre_processor(module_id_t module_idP,
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                                   slice_id_t slice_id,
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                                   int frameP,
                                   sub_frame_t subframeP,
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                                   unsigned char sched_subframeP,
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                                   uint16_t *first_rb)
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{
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    int16_t i;
    uint16_t UE_id, n, r;
    uint8_t CC_id, harq_pid;
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    uint16_t nb_allocated_rbs[NFAPI_CC_MAX][MAX_MOBILES_PER_ENB],
	total_allocated_rbs[NFAPI_CC_MAX],
	average_rbs_per_user[NFAPI_CC_MAX];
    int16_t total_remaining_rbs[NFAPI_CC_MAX];
    uint16_t total_ue_count[NFAPI_CC_MAX];
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    rnti_t rnti = -1;
    UE_list_t *UE_list = &RC.mac[module_idP]->UE_list;
    UE_TEMPLATE *UE_template = 0;
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    UE_sched_ctrl *ue_sched_ctl;
    int N_RB_UL = 0;

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    LOG_D(MAC, "In ulsch_preprocessor: assign max mcs min rb\n");
    // maximize MCS and then allocate required RB according to the buffer occupancy with the limit of max available UL RB
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    assign_max_mcs_min_rb(module_idP, slice_id, frameP, subframeP, first_rb);
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    LOG_D(MAC, "In ulsch_preprocessor: sort ue \n");
    // sort ues
    sort_ue_ul(module_idP, frameP, subframeP);


    // we need to distribute RBs among UEs
    // step1:  reset the vars
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    for (CC_id = 0; CC_id < RC.nb_mac_CC[module_idP]; CC_id++) {
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      total_allocated_rbs[CC_id] = 0;
      total_remaining_rbs[CC_id] = 0;
      average_rbs_per_user[CC_id] = 0;
      total_ue_count[CC_id] = 0;
    }

    // Step 1.5: Calculate total_ue_count
    for (i = UE_list->head_ul; i >= 0; i = UE_list->next_ul[i]) {
      for (n = 0; n < UE_list->numactiveULCCs[i]; n++) {
        // This is the actual CC_id in the list
        CC_id = UE_list->ordered_ULCCids[n][i];
        UE_template = &UE_list->UE_template[CC_id][i];
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        if (!ue_slice_membership(i, slice_id))
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          continue;
        if (UE_template->pre_allocated_nb_rb_ul[slice_id] > 0) {
          total_ue_count[CC_id] += 1;
        }
      }
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    }

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    LOG_D(MAC, "In ulsch_preprocessor: step2 \n");
    // step 2: calculate the average rb per UE
    for (i = UE_list->head_ul; i >= 0; i = UE_list->next_ul[i]) {
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      rnti = UE_RNTI(module_idP, i);
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      UE_id = i;
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      if (rnti == NOT_A_RNTI)
        continue;

      if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
        continue;

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      if (!ue_slice_membership(UE_id, slice_id))
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          continue;

      LOG_D(MAC, "In ulsch_preprocessor: handling UE %d/%x\n", UE_id,
            rnti);
      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];
        LOG_D(MAC,
              "In ulsch_preprocessor: handling UE %d/%x CCid %d\n",
              UE_id, rnti, CC_id);

        average_rbs_per_user[CC_id] = 0;

        /*
           if((mac_xface->get_nCCE_max(module_idP,CC_id,3,subframeP) - nCCE_to_be_used[CC_id])  > (1<<aggregation)) {
           nCCE_to_be_used[CC_id] = nCCE_to_be_used[CC_id] + (1<<aggregation);
           max_num_ue_to_be_scheduled+=1;
           } */



        N_RB_UL = to_prb(RC.mac[module_idP]->common_channels[CC_id].ul_Bandwidth);
        ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
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        ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] =
                nb_rbs_allowed_slice(slice_percentage_uplink[slice_id], N_RB_UL);
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        if (total_ue_count[CC_id] == 0) {
          average_rbs_per_user[CC_id] = 0;
        } else if (total_ue_count[CC_id] == 1) {    // increase the available RBs, special case,
          average_rbs_per_user[CC_id] = ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id] + 1;
        } else if (total_ue_count[CC_id] <= (ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id])) {
          average_rbs_per_user[CC_id] = (uint16_t) floor((ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id]) / total_ue_count[CC_id]);
        } else {
          average_rbs_per_user[CC_id] = 1;
          LOG_W(MAC,
                "[eNB %d] frame %d subframe %d: UE %d CC %d: can't get average rb per user (should not be here)\n",
                module_idP, frameP, subframeP, UE_id, CC_id);
        }
        if (total_ue_count[CC_id] > 0)
          LOG_D(MAC, "[eNB %d] Frame %d subframe %d: total ue to be scheduled %d\n",
                module_idP, frameP, subframeP, total_ue_count[CC_id]);
      }
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    }
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    // step 3: assigne RBS
    for (i = UE_list->head_ul; i >= 0; i = UE_list->next_ul[i]) {
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      rnti = UE_RNTI(module_idP, i);

      if (rnti == NOT_A_RNTI)
        continue;
      if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
        continue;
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      if (!ue_slice_membership(i, slice_id))
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        continue;


      UE_id = i;

      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];
        UE_template = &UE_list->UE_template[CC_id][UE_id];
        harq_pid = subframe2harqpid(&RC.mac[module_idP]->common_channels[CC_id],
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                                    frameP, sched_subframeP);
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        //      mac_xface->get_ue_active_harq_pid(module_idP,CC_id,rnti,frameP,subframeP,&harq_pid,&round,openair_harq_UL);

        if (UE_list->UE_sched_ctrl[UE_id].round_UL[CC_id] > 0) {
          nb_allocated_rbs[CC_id][UE_id] = UE_list->UE_template[CC_id][UE_id].nb_rb_ul[harq_pid];
        } else {
          nb_allocated_rbs[CC_id][UE_id] =
                  cmin(UE_list->UE_template[CC_id][UE_id].pre_allocated_nb_rb_ul[slice_id],
                       average_rbs_per_user[CC_id]);
        }

        total_allocated_rbs[CC_id] += nb_allocated_rbs[CC_id][UE_id];
        LOG_D(MAC,
              "In ulsch_preprocessor: assigning %d RBs for UE %d/%x CCid %d, harq_pid %d\n",
              nb_allocated_rbs[CC_id][UE_id], UE_id, rnti, CC_id,
              harq_pid);
      }
1812
    }
1813

1814
    // step 4: assigne the remaining RBs and set the pre_allocated rbs accordingly
1815
  for (r = 0; r < 2; r++) {
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    for (i = UE_list->head_ul; i >= 0; i = UE_list->next_ul[i]) {
      rnti = UE_RNTI(module_idP, i);

      if (rnti == NOT_A_RNTI)
        continue;
      if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
        continue;
1824
      if (!ue_slice_membership(i, slice_id))
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        continue;

      UE_id = i;
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      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
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      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];
        UE_template = &UE_list->UE_template[CC_id][UE_id];
        total_remaining_rbs[CC_id] =
                ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id] - total_allocated_rbs[CC_id];

        if (total_ue_count[CC_id] == 1) {
          total_remaining_rbs[CC_id] += 1;
        }

        if (r == 0) {
          while ((UE_template->pre_allocated_nb_rb_ul[slice_id] > 0)
                 && (nb_allocated_rbs[CC_id][UE_id] < UE_template->pre_allocated_nb_rb_ul[slice_id])
                 && (total_remaining_rbs[CC_id] > 0)) {
            nb_allocated_rbs[CC_id][UE_id] =
                    cmin(nb_allocated_rbs[CC_id][UE_id] + 1,
                         UE_template->pre_allocated_nb_rb_ul[slice_id]);
            total_remaining_rbs[CC_id]--;
            total_allocated_rbs[CC_id]++;
          }
        } else {
          UE_template->pre_allocated_nb_rb_ul[slice_id] =
                  nb_allocated_rbs[CC_id][UE_id];
          LOG_D(MAC,
                "******************UL Scheduling Information for UE%d CC_id %d ************************\n",
                UE_id, CC_id);
          LOG_D(MAC,
                "[eNB %d] total RB allocated for UE%d CC_id %d  = %d\n",
                module_idP, UE_id, CC_id,
                UE_template->pre_allocated_nb_rb_ul[slice_id]);
        }
      }
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    }
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  }
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}

1867
void
1868
assign_max_mcs_min_rb(module_id_t module_idP, int slice_id, int frameP,
1869
		      sub_frame_t subframeP, uint16_t * first_rb)
1870 1871
{

1872 1873 1874 1875
  int i;
  uint16_t n, UE_id;
  uint8_t CC_id;
  rnti_t rnti = -1;
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  int mcs;
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  int rb_table_index = 0, tbs, tx_power;
  eNB_MAC_INST *eNB = RC.mac[module_idP];
  UE_list_t *UE_list = &eNB->UE_list;
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1881 1882 1883 1884 1885
  UE_TEMPLATE *UE_template;
  UE_sched_ctrl *ue_sched_ctl;
  int Ncp;
  int N_RB_UL;

1886
  for (i = 0; i < MAX_MOBILES_PER_ENB; i++) {
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    if (UE_list->active[i] != TRUE)
      continue;

    rnti = UE_RNTI(module_idP, i);

    if (rnti == NOT_A_RNTI)
      continue;
    if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
      continue;
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    if (!ue_slice_membership(i, slice_id))
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      continue;

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    if (UE_list->UE_sched_ctrl[i].phr_received == 1) {
      /* if we've received the power headroom information the UE, we can go to
       * maximum mcs */
      mcs = cmin(20, slice_maxmcs_uplink[slice_id]);
    } else {
      /* otherwise, limit to QPSK PUSCH */
      mcs = cmin(10, slice_maxmcs_uplink[slice_id]);
    }
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1908
    UE_id = i;
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    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];


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      AssertFatal(CC_id < RC.nb_mac_CC[module_idP],
1917
                  "CC_id %u should be < %u, loop n=%u < numactiveULCCs[%u]=%u",
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                  CC_id, NFAPI_CC_MAX, n, UE_id,
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                  UE_list->numactiveULCCs[UE_id]);

      UE_template = &UE_list->UE_template[CC_id][UE_id];
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      UE_template->pre_assigned_mcs_ul = mcs;
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      ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];

      Ncp = RC.mac[module_idP]->common_channels[CC_id].Ncp;
      N_RB_UL = to_prb(RC.mac[module_idP]->common_channels[CC_id].ul_Bandwidth);
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      ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] =
              nb_rbs_allowed_slice(slice_percentage_uplink[slice_id], N_RB_UL);
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      int bytes_to_schedule = UE_template->estimated_ul_buffer - UE_template->scheduled_ul_bytes;
      if (bytes_to_schedule < 0) bytes_to_schedule = 0;
      int bits_to_schedule = bytes_to_schedule * 8;

1934
      // if this UE has UL traffic
1935
      if (bits_to_schedule > 0) {
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        tbs = get_TBS_UL(UE_template->pre_assigned_mcs_ul, 3) << 3; // 1 or 2 PRB with cqi enabled does not work well!
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        rb_table_index = 2;

        // fixme: set use_srs flag
        tx_power = estimate_ue_tx_power(tbs, rb_table[rb_table_index], 0, Ncp, 0);

        while ((((UE_template->phr_info - tx_power) < 0)
1943
              || (tbs > bits_to_schedule))
1944
              && (UE_template->pre_assigned_mcs_ul > 3)) {
1945
          // LOG_I(MAC,"UE_template->phr_info %d tx_power %d mcs %d\n", UE_template->phr_info,tx_power, mcs);
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          UE_template->pre_assigned_mcs_ul--;
          tbs = get_TBS_UL(UE_template->pre_assigned_mcs_ul, rb_table[rb_table_index]) << 3;
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          tx_power = estimate_ue_tx_power(tbs, rb_table[rb_table_index], 0, Ncp, 0);   // fixme: set use_srs
        }

        while ((tbs < bits_to_schedule)
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                && (rb_table[rb_table_index] < (ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id]))
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                && ((UE_template->phr_info - tx_power) > 0)
                && (rb_table_index < 32)) {
          rb_table_index++;
1956
          tbs = get_TBS_UL(UE_template->pre_assigned_mcs_ul, rb_table[rb_table_index]) << 3;
1957 1958 1959 1960 1961
          tx_power = estimate_ue_tx_power(tbs, rb_table[rb_table_index], 0, Ncp, 0);
        }

        UE_template->ue_tx_power = tx_power;

1962
        if (rb_table[rb_table_index] > (ue_sched_ctl->max_rbs_allowed_slice_uplink[CC_id][slice_id] - first_rb[CC_id] - 1)) {
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
          rb_table_index--;
        }
        // 1 or 2 PRB with cqi enabled does not work well
        if (rb_table[rb_table_index] < 3) {
            rb_table_index = 2;	//3PRB
        }

        UE_template->pre_allocated_rb_table_index_ul = rb_table_index;
        UE_template->pre_allocated_nb_rb_ul[slice_id] = rb_table[rb_table_index];
        LOG_D(MAC,
              "[eNB %d] frame %d subframe %d: for UE %d CC %d: pre-assigned mcs %d, pre-allocated rb_table[%d]=%d RBs (phr %d, tx power %d)\n",
              module_idP, frameP, subframeP, UE_id, CC_id,
              UE_template->pre_assigned_mcs_ul,
              UE_template->pre_allocated_rb_table_index_ul,
              UE_template->pre_allocated_nb_rb_ul[slice_id],
              UE_template->phr_info, tx_power);
      } else {
        /* if UE has pending scheduling request then pre-allocate 3 RBs */
        //if (UE_template->ul_active == 1 && UE_template->ul_SR == 1) {
        if (UE_is_to_be_scheduled(module_idP, CC_id, i)) {
          /* use QPSK mcs */
          UE_template->pre_assigned_mcs_ul = 10;
          UE_template->pre_allocated_rb_table_index_ul = 2;
          UE_template->pre_allocated_nb_rb_ul[slice_id] = 3;
        } else {
          UE_template->pre_assigned_mcs_ul = 0;
          UE_template->pre_allocated_rb_table_index_ul = -1;
          UE_template->pre_allocated_nb_rb_ul[slice_id] = 0;
        }
      }
1993
    }
1994
  }
1995 1996
}

1997
struct sort_ue_ul_params {
1998 1999 2000
    int module_idP;
    int frameP;
    int subframeP;
2001 2002 2003 2004
};

static int ue_ul_compare(const void *_a, const void *_b, void *_params)
{
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
    struct sort_ue_ul_params *params = _params;
    UE_list_t *UE_list = &RC.mac[params->module_idP]->UE_list;

    int UE_id1 = *(const int *) _a;
    int UE_id2 = *(const int *) _b;

    int rnti1 = UE_RNTI(params->module_idP, UE_id1);
    int pCCid1 = UE_PCCID(params->module_idP, UE_id1);
    int round1 = maxround(params->module_idP, rnti1, params->frameP,
			  params->subframeP, 1);

    int rnti2 = UE_RNTI(params->module_idP, UE_id2);
    int pCCid2 = UE_PCCID(params->module_idP, UE_id2);
    int round2 = maxround(params->module_idP, rnti2, params->frameP,
			  params->subframeP, 1);

    if (round1 > round2)
	return -1;
    if (round1 < round2)
	return 1;

    if (UE_list->UE_template[pCCid1][UE_id1].ul_buffer_info[LCGID0] >
	UE_list->UE_template[pCCid2][UE_id2].ul_buffer_info[LCGID0])
	return -1;
    if (UE_list->UE_template[pCCid1][UE_id1].ul_buffer_info[LCGID0] <
	UE_list->UE_template[pCCid2][UE_id2].ul_buffer_info[LCGID0])
	return 1;

2033 2034 2035 2036 2037 2038
    int bytes_to_schedule1 = UE_list->UE_template[pCCid1][UE_id1].estimated_ul_buffer - UE_list->UE_template[pCCid1][UE_id1].scheduled_ul_bytes;
    if (bytes_to_schedule1 < 0) bytes_to_schedule1 = 0;
    int bytes_to_schedule2 = UE_list->UE_template[pCCid2][UE_id2].estimated_ul_buffer - UE_list->UE_template[pCCid2][UE_id2].scheduled_ul_bytes;
    if (bytes_to_schedule2 < 0) bytes_to_schedule2 = 0;

    if (bytes_to_schedule1 > bytes_to_schedule2)
2039
	return -1;
2040
    if (bytes_to_schedule1 < bytes_to_schedule2)
2041 2042 2043 2044 2045 2046 2047 2048
	return 1;

    if (UE_list->UE_template[pCCid1][UE_id1].pre_assigned_mcs_ul >
	UE_list->UE_template[pCCid2][UE_id2].pre_assigned_mcs_ul)
	return -1;
    if (UE_list->UE_template[pCCid1][UE_id1].pre_assigned_mcs_ul <
	UE_list->UE_template[pCCid2][UE_id2].pre_assigned_mcs_ul)
	return 1;
2049

2050
    return 0;
2051
}
2052

2053
void sort_ue_ul(module_id_t module_idP, int frameP, sub_frame_t subframeP)
2054
{
2055
    int i;
2056
    int list[MAX_MOBILES_PER_ENB];
2057 2058 2059
    int list_size = 0;
    int rnti;
    struct sort_ue_ul_params params = { module_idP, frameP, subframeP };
2060

2061
    UE_list_t *UE_list = &RC.mac[module_idP]->UE_list;
2062

2063
    for (i = 0; i < MAX_MOBILES_PER_ENB; i++) {
2064 2065 2066 2067 2068 2069
	if (UE_list->active[i] == FALSE)
	    continue;
	if ((rnti = UE_RNTI(module_idP, i)) == NOT_A_RNTI)
	    continue;
	if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
	    continue;
2070

2071 2072 2073
	list[list_size] = i;
	list_size++;
    }
2074

2075
    qsort_r(list, list_size, sizeof(int), ue_ul_compare, &params);
2076

2077 2078 2079 2080 2081 2082 2083 2084
    if (list_size) {
	for (i = 0; i < list_size - 1; i++)
	    UE_list->next_ul[list[i]] = list[i + 1];
	UE_list->next_ul[list[list_size - 1]] = -1;
	UE_list->head_ul = list[0];
    } else {
	UE_list->head_ul = -1;
    }
2085
}