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41d16f1696da3d200261a75cd60de84c0a54776c
openairinterface5g/openair2/LAYER2/MAC/pre_processor.c
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Cedric Roux 622b919b37 improve multi-UEs scenario 
This commits contains several fixes to improve a multi-UE scenario.

This is not the end of the story.

Summary of work:
================

1 - improve SR (scheduling requests):

    We configured n1pucch == 3 for scheduling requests, for all
    UEs. We now use 71 - UE_id/10.

    For it to work, it is vital that pucch_nRB_CQI in the configuration
    file is set to 0, otherwise the SR will go to an RB used for
    PUSCH and uplink decoding will fail whenever an UE does SR.

    Note that we will have problems with 20MHz when we use a CCE that
    let the UE send the ACK/NACK using a n1pucch allocated for SR,
    because when the PDCCH is of size 3, we can have 87 CCEs
    and it may lead to an n1pucch colliding with one for SR.

    The work done in this patch is a quick solution, seems to work
    with 10MHz.

    The real solution is to disable the use of those CCEs that would
    lead an UE to use a n1pucch colliding with an SR n1pucch. Then
    we can use whatever n1pucch we want for SR, as long as the
    scheduler protects them.

    Impacted files: configuration files
                    openair2/RRC/LITE/MESSAGES/asn1_msg.c

2 - some fixes for uplink scheduling:

    - Do not use PRACH for PUSCH, that leads to too many false
    PRACH detection. Plus the PUSCH receiving may fail if one
    UE uses the PRACH at the same time.

    - Take care of retransmissions. That was not done at all, so
    we could allocate one RB to several UEs. The current design
    of the code makes it hard to do it properly, so we chose a
    quick and dirty solution, which is to increase "first_rb"
    to skip any RB used for retransmission. In this process we
    may skip a lot of free RBs. A proper solution is needed here.

    - Do not allocate the last RB. This one is used for PUCCH.
    It was sometimes allocated to PUSCH.

    - In the pre-processor we didn't pre-allocate RBs to UEs
    with an empty buffer status. We didn't check if the UE
    sent an SR. For example in a three UEs scenario, we
    could have the third UE never scheduled in the uplink.

    - rb_table_index was not decreased properly, so we allocated
    too much RBs to some UEs and thus not enough to others.

    Impacted files: openair2/LAYER2/MAC/eNB_scheduler_ulsch.c
                    openair2/LAYER2/MAC/pre_processor.c
                    openair1/SCHED/phy_procedures_lte_eNb.c

3 - some fixes for downlink scheduling:

    - The check on CCE allocation was not correct. We did something
    like:

        if (cce allocation is possible) {
          prepare
        }

    We should have done:

        save current cce allocation
        if (cce allocation is possible) {
          allocate cce
          prepare
        }
        reset current cce allocation

    Basically, when we scheduled several UEs, they were checked
    separately, and the totality of them was not checked.

    Impacted file: openair2/LAYER2/MAC/eNB_scheduler_dlsch.c

    - The retransmissions are probably not handled correctly.
    Check in openair2/LAYER2/MAC/pre_processor.c, near
    the comment "// control channel or retransmission",
    the case "round > 0" was added. It's probably not enough,
    even maybe not correct.

    - Change SF05_LIMIT with SF0_LIMIT. We accept to use
    central blocks in SF 5. The code was also not correct,
    vrb_map was not set properly because the loop on j
    was wrong for the last RBG (which can have one less
    RB than the others).

    This is not satisfying. The real solution is to use the
    central RBs and check that the MCS used is compatible
    with the numbers of resource elements allocated (we don't
    want to put too more data bits than what fits).

4 - some fixes in PUCCH decoding:

    See: openair1/PHY/LTE_TRANSPORT/pucch.c

    Probably not enough. Some more work and analysis is
    required for a proper use of the PUCCH. What we see
    is that the PUCCH constellation gets wrong when there
    are several UEs, meaning the received ACK/NACK is
    not properly decoded (this, or something else...).

5 - several fixes/checks added here and there:

    - The final allocate_CCEs in eNB_dlsch_ulsch_scheduler
      is checked and we brutally exit if it fails.

    - We exit in get_num_pdcch_symbols in case of failure
      (this should never happen anyway, no big deal normally).

    - Some logs added or changed to error/warning instead
      of debug.

    - In dlsch_scheduler_pre_processor an abort() was added.
      The code here looks suspicious.

    - In assign_max_mcs_min_rb, rb_table_index was not set
      to 2, the value 0 was used. This was not correct.

What remains to be done:
========================

    - Correct CCE allocation (take into account SR n1pucch,
      check that all the n1pucch that will be used are "compatible").

    - Take into account the PHICH when scheduling uplink. As of
      today it is very possible to have two UEs use the same PHICH
      group and PHICH sequence index. We can use n_DMRS in the DCI
      to have uniqueness (see 36.213 table 9.1.2-2). We can drop an
      allocation if there is no free PHICH group/sequence index for
      a given UE.

    - When there is an uplink retransmission in the PRACH, we have
      to disable PRACH detection. It is possible that one UE does
      PRACH at the same time, but then what to do? We could use
      DCI0-based retransmission in this specific case maybe...

    - Handle free RBs in uplink in a much better way in case of
      a retransmission. We may have a lot of free unused RBs with
      the current code.

    - Check downlink retransmissions. Not much has been done there.

    - Surely more stuff not clear yet. In some situations we don't
      have a good behavior of the system. Hard to describe more
      precisely at this point.
2017-08-24 17:34:18 +02:00

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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
* the OAI Public License, Version 1.0 (the "License"); you may not use this file
* 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
*/
/*! \file pre_processor.c
* \brief eNB scheduler preprocessing fuction prior to scheduling
* \author Navid Nikaein and Ankit Bhamri
* \date 2013 - 2014
* \email navid.nikaein@eurecom.fr
* \version 1.0
* @ingroup _mac
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include "assertions.h"
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "SCHED/defs.h"
#include "SCHED/extern.h"
#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/proto.h"
#include "LAYER2/MAC/extern.h"
#include "UTIL/LOG/log.h"
#include "UTIL/LOG/vcd_signal_dumper.h"
#include "UTIL/OPT/opt.h"
#include "OCG.h"
#include "OCG_extern.h"
#include "RRC/LITE/extern.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
#include "rlc.h"
#define DEBUG_eNB_SCHEDULER 1
#define DEBUG_HEADER_PARSING 1
//#define DEBUG_PACKET_TRACE 1
//#define ICIC 0
/*
#ifndef USER_MODE
#define msg debug_msg
#endif
*/
/* this function checks that get_eNB_UE_stats returns
* a non-NULL pointer for all the active CCs of an UE
*/
int phy_stats_exist(module_id_t Mod_id, int rnti)
{
int CC_id;
int i;
int UE_id = find_UE_id(Mod_id, rnti);
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
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];
if (mac_xface->get_eNB_UE_stats(Mod_id, CC_id, rnti) == NULL)
return 0;
}
return 1;
}
// This function stores the downlink buffer for all the logical channels
void store_dlsch_buffer (module_id_t Mod_id,
frame_t frameP,
sub_frame_t subframeP)
{
int UE_id,i;
rnti_t rnti;
mac_rlc_status_resp_t rlc_status;
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
UE_TEMPLATE *UE_template;
for (UE_id = 0; UE_id < NUMBER_OF_UE_MAX; UE_id++) {
if (UE_list->active[UE_id] != TRUE) continue;
UE_template = &UE_list->UE_template[UE_PCCID(Mod_id,UE_id)][UE_id];
// clear logical channel interface variables
UE_template->dl_buffer_total = 0;
UE_template->dl_pdus_total = 0;
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;
}
rnti = UE_RNTI(Mod_id,UE_id);
for(i=0; i< MAX_NUM_LCID; i++) { // loop over all the logical channels
rlc_status = mac_rlc_status_ind(Mod_id,rnti, Mod_id,frameP,subframeP,ENB_FLAG_YES,MBMS_FLAG_NO,i,0 );
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];
#ifdef DEBUG_eNB_SCHEDULER
/* 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,
"[eNB %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, frameP, subframeP, UE_id,
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]
);
#endif
}
//#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
);
//#endif
}
}
// This function returns the estimated number of RBs required by each UE for downlink scheduling
void assign_rbs_required (module_id_t Mod_id,
frame_t frameP,
sub_frame_t subframe,
uint16_t nb_rbs_required[MAX_NUM_CCs][NUMBER_OF_UE_MAX],
int min_rb_unit[MAX_NUM_CCs])
{
rnti_t rnti;
uint16_t TBS = 0;
LTE_eNB_UE_stats *eNB_UE_stats[MAX_NUM_CCs];
int UE_id,n,i,j,CC_id,pCCid,tmp;
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
// UE_TEMPLATE *UE_template;
LTE_DL_FRAME_PARMS *frame_parms[MAX_NUM_CCs];
// clear rb allocations across all CC_ids
for (UE_id = 0; UE_id < NUMBER_OF_UE_MAX; UE_id++) {
if (UE_list->active[UE_id] != TRUE) continue;
pCCid = UE_PCCID(Mod_id,UE_id);
rnti = UE_list->UE_template[pCCid][UE_id].rnti;
/* skip UE not present in PHY (for any of its active CCs) */
if (!phy_stats_exist(Mod_id, rnti))
continue;
//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];
frame_parms[CC_id] = mac_xface->get_lte_frame_parms(Mod_id,CC_id);
eNB_UE_stats[CC_id] = mac_xface->get_eNB_UE_stats(Mod_id,CC_id,rnti);
/*
DevCheck(((eNB_UE_stats[CC_id]->DL_cqi[0] < MIN_CQI_VALUE) || (eNB_UE_stats[CC_id]->DL_cqi[0] > MAX_CQI_VALUE)),
eNB_UE_stats[CC_id]->DL_cqi[0], MIN_CQI_VALUE, MAX_CQI_VALUE);
*/
eNB_UE_stats[CC_id]->dlsch_mcs1=cqi_to_mcs[eNB_UE_stats[CC_id]->DL_cqi[0]];
eNB_UE_stats[CC_id]->dlsch_mcs1 = eNB_UE_stats[CC_id]->dlsch_mcs1;//cmin(eNB_UE_stats[CC_id]->dlsch_mcs1,openair_daq_vars.target_ue_dl_mcs);
}
// provide the list of CCs sorted according to MCS
for (i=0; i<UE_list->numactiveCCs[UE_id]; i++) {
for (j=i+1; j<UE_list->numactiveCCs[UE_id]; j++) {
DevAssert( j < MAX_NUM_CCs );
if (eNB_UE_stats[UE_list->ordered_CCids[i][UE_id]]->dlsch_mcs1 >
eNB_UE_stats[UE_list->ordered_CCids[j][UE_id]]->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;
}
}
}
/*
if ((mac_get_rrc_status(Mod_id,1,UE_id) < RRC_RECONFIGURED)){ // If we still don't have a default radio bearer
nb_rbs_required[pCCid][UE_id] = PHY_vars_eNB_g[Mod_id][pCCid]->frame_parms.N_RB_DL;
continue;
}
*/
/* NN --> RK
* check the index of UE_template"
*/
// if (UE_list->UE_template[UE_id]->dl_buffer_total> 0) {
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];
frame_parms[CC_id] = mac_xface->get_lte_frame_parms(Mod_id,CC_id);
eNB_UE_stats[CC_id] = mac_xface->get_eNB_UE_stats(Mod_id,CC_id,rnti);
if (eNB_UE_stats[CC_id]->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 = mac_xface->get_TBS_DL(eNB_UE_stats[CC_id]->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[CC_id]->dlsch_mcs1,TBS);
/* 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];
if (nb_rbs_required[CC_id][UE_id] > frame_parms[CC_id]->N_RB_DL) {
TBS = mac_xface->get_TBS_DL(eNB_UE_stats[CC_id]->dlsch_mcs1,frame_parms[CC_id]->N_RB_DL);
nb_rbs_required[CC_id][UE_id] = frame_parms[CC_id]->N_RB_DL;
break;
}
TBS = mac_xface->get_TBS_DL(eNB_UE_stats[CC_id]->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[CC_id]->dlsch_mcs1);
}
}
}
}
// This function scans all CC_ids for a particular UE to find the maximum round index of its HARQ processes
int maxround(module_id_t Mod_id,uint16_t rnti,int frame,sub_frame_t subframe,uint8_t ul_flag )
{
uint8_t round,round_max=0,UE_id;
int CC_id;
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
UE_id = find_UE_id(Mod_id,rnti);
round = UE_list->UE_sched_ctrl[UE_id].round[CC_id];
if (round > round_max) {
round_max = round;
}
}
return round_max;
}
// This function scans all CC_ids for a particular UE to find the maximum DL CQI
// it returns -1 if the UE is not found in PHY layer (get_eNB_UE_stats gives NULL)
int maxcqi(module_id_t Mod_id,int32_t UE_id)
{
LTE_eNB_UE_stats *eNB_UE_stats = NULL;
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
int CC_id,n;
int CQI = 0;
for (n=0; n<UE_list->numactiveCCs[UE_id]; n++) {
CC_id = UE_list->ordered_CCids[n][UE_id];
eNB_UE_stats = mac_xface->get_eNB_UE_stats(Mod_id,CC_id,UE_RNTI(Mod_id,UE_id));
if (eNB_UE_stats==NULL) {
/* the UE may have been removed in the PHY layer, don't exit */
//mac_xface->macphy_exit("maxcqi: could not get eNB_UE_stats\n");
return -1;
}
if (eNB_UE_stats->DL_cqi[0] > CQI) {
CQI = eNB_UE_stats->DL_cqi[0];
}
}
return(CQI);
}
struct sort_ue_dl_params {
int Mod_idP;
int frameP;
int subframeP;
};
static int ue_dl_compare(const void *_a, const void *_b, void *_params)
{
struct sort_ue_dl_params *params = _params;
UE_list_t *UE_list = &eNB_mac_inst[params->Mod_idP].UE_list;
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);
int round1 = maxround(params->Mod_idP, rnti1, params->frameP, params->subframeP, 1);
int rnti2 = UE_RNTI(params->Mod_idP, UE_id2);
int pCC_id2 = UE_PCCID(params->Mod_idP, UE_id2);
int round2 = maxround(params->Mod_idP, rnti2, params->frameP, params->subframeP, 1);
int cqi1 = maxcqi(params->Mod_idP, UE_id1);
int cqi2 = maxcqi(params->Mod_idP, UE_id2);
if (round1 > round2) return -1;
if (round1 < round2) 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;
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_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;
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;
if (cqi1 > cqi2) return -1;
if (cqi1 < cqi2) return 1;
return 0;
#if 0
/* The above order derives from the following. */
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);
}
}
#endif
}
// This fuction sorts the UE in order their dlsch buffer and CQI
void sort_UEs (module_id_t Mod_idP,
int frameP,
sub_frame_t subframeP)
{
int i;
int list[NUMBER_OF_UE_MAX];
int list_size = 0;
int rnti;
struct sort_ue_dl_params params = { Mod_idP, frameP, subframeP };
UE_list_t *UE_list = &eNB_mac_inst[Mod_idP].UE_list;
for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
rnti = UE_RNTI(Mod_idP, i);
if (rnti == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(Mod_idP, rnti))
continue;
list[list_size] = i;
list_size++;
}
qsort_r(list, list_size, sizeof(int), ue_dl_compare, &params);
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 = &eNB_mac_inst[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;
if (!phy_stats_exist(Mod_idP, rnti1))
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;
if (!phy_stats_exist(Mod_idP, rnti2))
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);
}
}
}
}
#endif
}
// 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,
frame_t frameP,
sub_frame_t subframeP,
int N_RBG[MAX_NUM_CCs],
int *mbsfn_flag)
{
unsigned char rballoc_sub[MAX_NUM_CCs][N_RBG_MAX],harq_pid=0,round=0,total_ue_count;
unsigned char MIMO_mode_indicator[MAX_NUM_CCs][N_RBG_MAX];
int UE_id, i;
uint16_t ii,j;
uint16_t nb_rbs_required[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
uint16_t nb_rbs_required_remaining[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
uint16_t nb_rbs_required_remaining_1[MAX_NUM_CCs][NUMBER_OF_UE_MAX];
uint16_t average_rbs_per_user[MAX_NUM_CCs] = {0};
rnti_t rnti;
int min_rb_unit[MAX_NUM_CCs];
uint16_t r1=0;
uint8_t CC_id;
UE_list_t *UE_list = &eNB_mac_inst[Mod_id].UE_list;
LTE_DL_FRAME_PARMS *frame_parms[MAX_NUM_CCs] = {0};
int transmission_mode = 0;
UE_sched_ctrl *ue_sched_ctl;
// int rrc_status = RRC_IDLE;
#ifdef TM5
int harq_pid1=0,harq_pid2=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;
#endif
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
if (mbsfn_flag[CC_id]>0) // If this CC is allocated for MBSFN skip it here
continue;
frame_parms[CC_id] = mac_xface->get_lte_frame_parms(Mod_id,CC_id);
min_rb_unit[CC_id]=get_min_rb_unit(Mod_id,CC_id);
for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
if (UE_list->active[i] != TRUE) continue;
UE_id = i;
// Initialize scheduling information for all active UEs
dlsch_scheduler_pre_processor_reset(Mod_id,
UE_id,
CC_id,
frameP,
subframeP,
N_RBG[CC_id],
nb_rbs_required,
nb_rbs_required_remaining,
rballoc_sub,
MIMO_mode_indicator);
}
}
// Store the DLSCH buffer for each logical channel
store_dlsch_buffer (Mod_id,frameP,subframeP);
// Calculate the number of RBs required by each UE on the basis of logical channel's buffer
assign_rbs_required (Mod_id,frameP,subframeP,nb_rbs_required,min_rb_unit);
// Sorts the user on the basis of dlsch logical channel buffer and CQI
sort_UEs (Mod_id,frameP,subframeP);
total_ue_count =0;
// loop over all active UEs
for (i=UE_list->head; i>=0; i=UE_list->next[i]) {
rnti = UE_RNTI(Mod_id,i);
if(rnti == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(Mod_id, rnti))
continue;
UE_id = i;
for (ii=0; ii<UE_num_active_CC(UE_list,UE_id); ii++) {
CC_id = UE_list->ordered_CCids[ii][UE_id];
ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
harq_pid = ue_sched_ctl->harq_pid[CC_id];
round = ue_sched_ctl->round[CC_id];
// if there is no available harq_process, skip the UE
if (UE_list->UE_sched_ctrl[UE_id].harq_pid[CC_id]<0)
continue;
average_rbs_per_user[CC_id]=0;
frame_parms[CC_id] = mac_xface->get_lte_frame_parms(Mod_id,CC_id);
// mac_xface->get_ue_active_harq_pid(Mod_id,CC_id,rnti,frameP,subframeP,&harq_pid,&round,0);
if(round>0) {
nb_rbs_required[CC_id][UE_id] = UE_list->UE_template[CC_id][UE_id].nb_rb[harq_pid];
}
//nb_rbs_required_remaining[UE_id] = nb_rbs_required[UE_id];
if (nb_rbs_required[CC_id][UE_id] > 0) {
total_ue_count = total_ue_count + 1;
}
// hypotetical assignement
/*
* If schedule is enabled and if the priority of the UEs is modified
* The average rbs per logical channel per user will depend on the level of
* priority. Concerning the hypothetical assignement, we should assign more
* rbs to prioritized users. Maybe, we can do a mapping between the
* average rbs per user and the level of priority or multiply the average rbs
* per user by a coefficient which represents the degree of priority.
*/
if (total_ue_count == 0) {
average_rbs_per_user[CC_id] = 0;
} else if( (min_rb_unit[CC_id] * total_ue_count) <= (frame_parms[CC_id]->N_RB_DL) ) {
average_rbs_per_user[CC_id] = (uint16_t) floor(frame_parms[CC_id]->N_RB_DL/total_ue_count);
} else {
average_rbs_per_user[CC_id] = min_rb_unit[CC_id]; // consider the total number of use that can be scheduled UE
}
}
}
// note: nb_rbs_required is assigned according to total_buffer_dl
// extend nb_rbs_required to capture per LCID RB required
for(i=UE_list->head; i>=0; i=UE_list->next[i]) {
rnti = UE_RNTI(Mod_id,i);
if(rnti == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(Mod_id, rnti))
continue;
for (ii=0; ii<UE_num_active_CC(UE_list,i); ii++) {
CC_id = UE_list->ordered_CCids[ii][i];
ue_sched_ctl = &UE_list->UE_sched_ctrl[i];
round = ue_sched_ctl->round[CC_id];
// control channel or retransmission
/* TODO: do we have to check for retransmission? */
if (mac_eNB_get_rrc_status(Mod_id,rnti) < RRC_RECONFIGURED || round > 0) {
nb_rbs_required_remaining_1[CC_id][i] = nb_rbs_required[CC_id][i];
} else {
nb_rbs_required_remaining_1[CC_id][i] = cmin(average_rbs_per_user[CC_id],nb_rbs_required[CC_id][i]);
}
}
}
//Allocation to UEs is done in 2 rounds,
// 1st stage: average number of RBs allocated to each UE
// 2nd stage: remaining RBs are allocated to high priority UEs
for(r1=0; r1<2; r1++) {
for(i=UE_list->head; i>=0; i=UE_list->next[i]) {
for (ii=0; ii<UE_num_active_CC(UE_list,i); ii++) {
CC_id = UE_list->ordered_CCids[ii][i];
if(r1 == 0) {
nb_rbs_required_remaining[CC_id][i] = nb_rbs_required_remaining_1[CC_id][i];
} else { // rb required based only on the buffer - rb allloctaed in the 1st round + extra reaming rb form the 1st round
nb_rbs_required_remaining[CC_id][i] = nb_rbs_required[CC_id][i]-nb_rbs_required_remaining_1[CC_id][i]+nb_rbs_required_remaining[CC_id][i];
if (nb_rbs_required_remaining[CC_id][i]<0) abort();
}
if (nb_rbs_required[CC_id][i]> 0 )
LOG_D(MAC,"round %d : nb_rbs_required_remaining[%d][%d]= %d (remaining_1 %d, required %d, pre_nb_available_rbs %d, N_RBG %d, rb_unit %d)\n",
r1, CC_id, i,
nb_rbs_required_remaining[CC_id][i],
nb_rbs_required_remaining_1[CC_id][i],
nb_rbs_required[CC_id][i],
UE_list->UE_sched_ctrl[i].pre_nb_available_rbs[CC_id],
N_RBG[CC_id],
min_rb_unit[CC_id]);
}
}
if (total_ue_count > 0 ) {
for(i=UE_list->head; i>=0; i=UE_list->next[i]) {
UE_id = i;
for (ii=0; ii<UE_num_active_CC(UE_list,UE_id); ii++) {
CC_id = UE_list->ordered_CCids[ii][UE_id];
ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
harq_pid = ue_sched_ctl->harq_pid[CC_id];
round = ue_sched_ctl->round[CC_id];
rnti = UE_RNTI(Mod_id,UE_id);
// LOG_D(MAC,"UE %d rnti 0x\n", UE_id, rnti );
if(rnti == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(Mod_id, rnti))
continue;
transmission_mode = mac_xface->get_transmission_mode(Mod_id,CC_id,rnti);
// mac_xface->get_ue_active_harq_pid(Mod_id,CC_id,rnti,frameP,subframeP,&harq_pid,&round,0);
//rrc_status = mac_eNB_get_rrc_status(Mod_id,rnti);
/* 1st allocate for the retx */
// retransmission in data channels
// control channel in the 1st transmission
// data channel for all TM
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],
transmission_mode,
min_rb_unit[CC_id],
frame_parms[CC_id]->N_RB_DL,
nb_rbs_required,
nb_rbs_required_remaining,
rballoc_sub,
MIMO_mode_indicator);
#ifdef TM5
// data chanel TM5: to be revisted
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_required_remaining[CC_id][UE_id]>0)) {
for (ii = UE_list->next[i+1]; ii >=0; ii=UE_list->next[ii]) {
UE_id2 = ii;
rnti2 = UE_RNTI(Mod_id,UE_id2);
ue_sched_ctl2 = &UE_list->UE_sched_ctrl[UE_id2];
harq_pid2 = ue_sched_ctl2->harq_pid[CC_id];
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;
if (!phy_stats_exist(Mod_idP, rnti2))
continue;
eNB_UE_stats2 = mac_xface->get_eNB_UE_stats(Mod_id,CC_id,rnti2);
//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) &&
(mac_xface->get_transmission_mode(Mod_id,CC_id,rnti2)==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_required_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) &&
((PHY_vars_eNB_g[Mod_id][CC_id]->frame_parms.N_RB_DL == 25) ||
(PHY_vars_eNB_g[Mod_id][CC_id]->frame_parms.N_RB_DL == 50))) {
nb_rbs_required_remaining[CC_id][UE_id] = nb_rbs_required_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_required_remaining[CC_id][UE_id2] = nb_rbs_required_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_required_remaining[CC_id][UE_id] = nb_rbs_required_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_required_remaining[CC_id][UE_id2] = nb_rbs_required_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
}
}
} // total_ue_count
} // end of for for r1 and r2
#ifdef TM5
// This has to be revisited!!!!
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
i1=0;
i2=0;
i3=0;
for (j=0; j<N_RBG[CC_id]; j++) {
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;
}
}
if((i1 < N_RBG[CC_id]) && (i2>0) && (i3==0)) {
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;
}
if(i3 == N_RBG[CC_id] && i1==0 && i2==0) {
PHY_vars_eNB_g[Mod_id][CC_id]->FULL_MUMIMO_transmissions = PHY_vars_eNB_g[Mod_id][CC_id]->FULL_MUMIMO_transmissions + 1;
}
if((i1 < N_RBG[CC_id]) && (i3 > 0)) {
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;
}
PHY_vars_eNB_g[Mod_id][CC_id]->check_for_total_transmissions = PHY_vars_eNB_g[Mod_id][CC_id]->check_for_total_transmissions + 1;
}
#endif
for(i=UE_list->head; i>=0; i=UE_list->next[i]) {
UE_id = i;
ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
for (ii=0; ii<UE_num_active_CC(UE_list,UE_id); ii++) {
CC_id = UE_list->ordered_CCids[ii][UE_id];
//PHY_vars_eNB_g[Mod_id]->mu_mimo_mode[UE_id].dl_pow_off = dl_pow_off[UE_id];
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);
for(j=0; j<N_RBG[CC_id]; j++) {
//PHY_vars_eNB_g[Mod_id]->mu_mimo_mode[UE_id].rballoc_sub[i] = rballoc_sub_UE[CC_id][UE_id][i];
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,"Total RBs allocated for UE%d = %d\n",UE_id,ue_sched_ctl->pre_nb_available_rbs[CC_id]);
}
}
}
}
#define SF0_LIMIT 1
void dlsch_scheduler_pre_processor_reset (int module_idP,
int UE_id,
uint8_t CC_id,
int frameP,
int subframeP,
int N_RBG,
uint16_t nb_rbs_required[MAX_NUM_CCs][NUMBER_OF_UE_MAX],
uint16_t nb_rbs_required_remaining[MAX_NUM_CCs][NUMBER_OF_UE_MAX],
unsigned char rballoc_sub[MAX_NUM_CCs][N_RBG_MAX],
unsigned char MIMO_mode_indicator[MAX_NUM_CCs][N_RBG_MAX])
{
int i,j;
UE_list_t *UE_list=&eNB_mac_inst[module_idP].UE_list;
UE_sched_ctrl *ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
rnti_t rnti = UE_RNTI(module_idP,UE_id);
uint8_t *vrb_map = eNB_mac_inst[module_idP].common_channels[CC_id].vrb_map;
int RBGsize;
int RBGsize_last;
#ifdef SF0_LIMIT
int sf0_upper=-1,sf0_lower=-1;
#endif
LTE_eNB_UE_stats *eNB_UE_stats = mac_xface->get_eNB_UE_stats(module_idP,CC_id,rnti);
if (eNB_UE_stats == NULL) return;
// initialize harq_pid and round
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 (PHY_vars_eNB_g[module_idP][CC_id]->frame_parms.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:
if (PHY_vars_eNB_g[module_idP][CC_id]->frame_parms.threequarter_fs == 0)
ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/16;
else
ue_sched_ctl->ta_update = eNB_UE_stats->timing_advance_update/12;
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;
nb_rbs_required_remaining[CC_id][UE_id] = 0;
switch (PHY_vars_eNB_g[module_idP][CC_id]->frame_parms.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: printf("unsupported RBs (%d)\n", PHY_vars_eNB_g[module_idP][CC_id]->frame_parms.N_RB_DL); fflush(stdout); abort();
}
#ifdef SF0_LIMIT
switch (N_RBG) {
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: printf("unsupported RBs (%d)\n", PHY_vars_eNB_g[module_idP][CC_id]->frame_parms.N_RB_DL); fflush(stdout); abort();
}
#endif
// Initialize Subbands according to VRB map
for (i=0; i<N_RBG; i++) {
int rb_size = i==N_RBG-1 ? RBGsize_last : RBGsize;
ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 0;
rballoc_sub[CC_id][i] = 0;
#ifdef SF0_LIMIT
// 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;
#endif
// 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;
}
}
void dlsch_scheduler_pre_processor_allocate (module_id_t Mod_id,
int UE_id,
uint8_t CC_id,
int N_RBG,
int transmission_mode,
int min_rb_unit,
uint8_t N_RB_DL,
uint16_t nb_rbs_required[MAX_NUM_CCs][NUMBER_OF_UE_MAX],
uint16_t nb_rbs_required_remaining[MAX_NUM_CCs][NUMBER_OF_UE_MAX],
unsigned char rballoc_sub[MAX_NUM_CCs][N_RBG_MAX],
unsigned char MIMO_mode_indicator[MAX_NUM_CCs][N_RBG_MAX])
{
int i;
UE_list_t *UE_list=&eNB_mac_inst[Mod_id].UE_list;
UE_sched_ctrl *ue_sched_ctl = &UE_list->UE_sched_ctrl[UE_id];
for(i=0; i<N_RBG; i++) {
if((rballoc_sub[CC_id][i] == 0) &&
(ue_sched_ctl->rballoc_sub_UE[CC_id][i] == 0) &&
(nb_rbs_required_remaining[CC_id][UE_id]>0) &&
(ue_sched_ctl->pre_nb_available_rbs[CC_id] < nb_rbs_required[CC_id][UE_id])) {
// if this UE is not scheduled for TM5
if (ue_sched_ctl->dl_pow_off[CC_id] != 0 ) {
if ((i == N_RBG-1) && ((N_RB_DL == 25) || (N_RB_DL == 50))) {
if (nb_rbs_required_remaining[CC_id][UE_id] >= min_rb_unit-1){
rballoc_sub[CC_id][i] = 1;
ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 1;
MIMO_mode_indicator[CC_id][i] = 1;
if (transmission_mode == 5 ) {
ue_sched_ctl->dl_pow_off[CC_id] = 1;
}
nb_rbs_required_remaining[CC_id][UE_id] = nb_rbs_required_remaining[CC_id][UE_id] - min_rb_unit+1;
ue_sched_ctl->pre_nb_available_rbs[CC_id] = ue_sched_ctl->pre_nb_available_rbs[CC_id] + min_rb_unit - 1;
}
} else {
if (nb_rbs_required_remaining[CC_id][UE_id] >= min_rb_unit){
rballoc_sub[CC_id][i] = 1;
ue_sched_ctl->rballoc_sub_UE[CC_id][i] = 1;
MIMO_mode_indicator[CC_id][i] = 1;
if (transmission_mode == 5 ) {
ue_sched_ctl->dl_pow_off[CC_id] = 1;
}
nb_rbs_required_remaining[CC_id][UE_id] = nb_rbs_required_remaining[CC_id][UE_id] - min_rb_unit;
ue_sched_ctl->pre_nb_available_rbs[CC_id] = ue_sched_ctl->pre_nb_available_rbs[CC_id] + min_rb_unit;
}
}
} // dl_pow_off[CC_id][UE_id] ! = 0
}
}
}
/// ULSCH PRE_PROCESSOR
void ulsch_scheduler_pre_processor(module_id_t module_idP,
int frameP,
sub_frame_t subframeP,
uint16_t *first_rb)
{
int16_t i;
uint16_t UE_id,n,r;
uint8_t CC_id, round, harq_pid;
uint16_t nb_allocated_rbs[MAX_NUM_CCs][NUMBER_OF_UE_MAX],total_allocated_rbs[MAX_NUM_CCs],average_rbs_per_user[MAX_NUM_CCs];
int16_t total_remaining_rbs[MAX_NUM_CCs];
uint16_t max_num_ue_to_be_scheduled=0,total_ue_count=0;
rnti_t rnti= -1;
UE_list_t *UE_list = &eNB_mac_inst[module_idP].UE_list;
UE_TEMPLATE *UE_template = 0;
LTE_DL_FRAME_PARMS *frame_parms = 0;
//LOG_I(MAC,"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
assign_max_mcs_min_rb(module_idP,frameP, subframeP, first_rb);
//LOG_I(MAC,"sort ue \n");
// sort ues
sort_ue_ul (module_idP,frameP, subframeP);
// we need to distribute RBs among UEs
// step1: reset the vars
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
total_allocated_rbs[CC_id]=0;
total_remaining_rbs[CC_id]=0;
average_rbs_per_user[CC_id]=0;
for (i=UE_list->head_ul; i>=0; i=UE_list->next_ul[i]) {
nb_allocated_rbs[CC_id][i]=0;
}
}
//LOG_I(MAC,"step2 \n");
// step 2: calculate the average rb per UE
total_ue_count =0;
max_num_ue_to_be_scheduled=0;
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;
if (!phy_stats_exist(module_idP, rnti))
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];
average_rbs_per_user[CC_id]=0;
frame_parms = mac_xface->get_lte_frame_parms(module_idP,CC_id);
if (UE_template->pre_allocated_nb_rb_ul > 0) {
total_ue_count+=1;
}
/*
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;
}*/
max_num_ue_to_be_scheduled+=1;
if (total_ue_count == 0) {
average_rbs_per_user[CC_id] = 0;
} else if (total_ue_count == 1 ) { // increase the available RBs, special case,
average_rbs_per_user[CC_id] = frame_parms->N_RB_UL-first_rb[CC_id]+1;
} else if( (total_ue_count <= (frame_parms->N_RB_DL-first_rb[CC_id])) &&
(total_ue_count <= max_num_ue_to_be_scheduled)) {
average_rbs_per_user[CC_id] = (uint16_t) floor((frame_parms->N_RB_UL-first_rb[CC_id])/total_ue_count);
} else if (max_num_ue_to_be_scheduled > 0 ) {
average_rbs_per_user[CC_id] = (uint16_t) floor((frame_parms->N_RB_UL-first_rb[CC_id])/max_num_ue_to_be_scheduled);
} 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 > 0)
LOG_D(MAC,"[eNB %d] Frame %d subframe %d: total ue to be scheduled %d/%d\n",
module_idP, frameP, subframeP,total_ue_count, max_num_ue_to_be_scheduled);
//LOG_D(MAC,"step3\n");
// step 3: assigne RBS
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;
if (!phy_stats_exist(module_idP, rnti))
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];
mac_xface->get_ue_active_harq_pid(module_idP,CC_id,rnti,frameP,subframeP,&harq_pid,&round,openair_harq_UL);
if(round>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, average_rbs_per_user[CC_id]);
}
total_allocated_rbs[CC_id]+= nb_allocated_rbs[CC_id][UE_id];
}
}
// step 4: assigne the remaining RBs and set the pre_allocated rbs accordingly
for(r=0; r<2; r++) {
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;
if (!phy_stats_exist(module_idP, rnti))
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];
frame_parms = mac_xface->get_lte_frame_parms(module_idP,CC_id);
total_remaining_rbs[CC_id]=frame_parms->N_RB_UL - first_rb[CC_id] - total_allocated_rbs[CC_id];
if (total_ue_count == 1 ) {
total_remaining_rbs[CC_id]+=1;
}
if ( r == 0 ) {
while ( (UE_template->pre_allocated_nb_rb_ul > 0 ) &&
(nb_allocated_rbs[CC_id][UE_id] < UE_template->pre_allocated_nb_rb_ul) &&
(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);
total_remaining_rbs[CC_id]--;
total_allocated_rbs[CC_id]++;
}
} else {
UE_template->pre_allocated_nb_rb_ul= 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);
}
}
}
}
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
frame_parms= mac_xface->get_lte_frame_parms(module_idP,CC_id);
if (total_allocated_rbs[CC_id]>0) {
LOG_D(MAC,"[eNB %d] total RB allocated for all UEs = %d/%d\n", module_idP, total_allocated_rbs[CC_id], frame_parms->N_RB_UL - first_rb[CC_id]);
}
}
}
void assign_max_mcs_min_rb(module_id_t module_idP,int frameP, sub_frame_t subframeP, uint16_t *first_rb)
{
int i;
uint16_t n,UE_id;
uint8_t CC_id;
rnti_t rnti = -1;
int mcs;
int rb_table_index=0,tbs,tx_power;
eNB_MAC_INST *eNB = &eNB_mac_inst[module_idP];
UE_list_t *UE_list = &eNB->UE_list;
UE_TEMPLATE *UE_template;
LTE_DL_FRAME_PARMS *frame_parms;
for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
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;
if (!phy_stats_exist(module_idP, rnti))
continue;
if (UE_list->UE_sched_ctrl[i].phr_received == 1)
mcs = 20; // if we've received the power headroom information the UE, we can go to maximum mcs
else
mcs = 10; // otherwise, limit to QPSK PUSCH
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];
if (CC_id >= MAX_NUM_CCs) {
LOG_E( MAC, "CC_id %u should be < %u, loop n=%u < numactiveULCCs[%u]=%u",
CC_id,
MAX_NUM_CCs,
n,
UE_id,
UE_list->numactiveULCCs[UE_id]);
}
AssertFatal( CC_id < MAX_NUM_CCs, "CC_id %u should be < %u, loop n=%u < numactiveULCCs[%u]=%u",
CC_id,
MAX_NUM_CCs,
n,
UE_id,
UE_list->numactiveULCCs[UE_id]);
frame_parms=mac_xface->get_lte_frame_parms(module_idP,CC_id);
UE_template = &UE_list->UE_template[CC_id][UE_id];
// if this UE has UL traffic
if (UE_template->ul_total_buffer > 0 ) {
/* start with 3 RB => rb_table_index = 2 */
rb_table_index = 2;
tbs = mac_xface->get_TBS_UL(mcs,3); // 1 or 2 PRB with cqi enabled does not work well!
// fixme: set use_srs flag
tx_power= mac_xface->estimate_ue_tx_power(tbs,rb_table[rb_table_index],0,frame_parms->Ncp,0);
while ((((UE_template->phr_info - tx_power) < 0 ) || (tbs > UE_template->ul_total_buffer))&&
(mcs > 3)) {
// LOG_I(MAC,"UE_template->phr_info %d tx_power %d mcs %d\n", UE_template->phr_info,tx_power, mcs);
mcs--;
tbs = mac_xface->get_TBS_UL(mcs,rb_table[rb_table_index]);
tx_power = mac_xface->estimate_ue_tx_power(tbs,rb_table[rb_table_index],0,frame_parms->Ncp,0); // fixme: set use_srs
}
while ((tbs < UE_template->ul_total_buffer) &&
(rb_table[rb_table_index]<(frame_parms->N_RB_UL-first_rb[CC_id])) &&
((UE_template->phr_info - tx_power) > 0) &&
(rb_table_index < 32 )) {
// LOG_I(MAC,"tbs %d ul buffer %d rb table %d max ul rb %d\n", tbs, UE_template->ul_total_buffer, rb_table[rb_table_index], frame_parms->N_RB_UL-first_rb[CC_id]);
rb_table_index++;
tbs = mac_xface->get_TBS_UL(mcs,rb_table[rb_table_index]);
tx_power = mac_xface->estimate_ue_tx_power(tbs,rb_table[rb_table_index],0,frame_parms->Ncp,0);
}
UE_template->ue_tx_power = tx_power;
if (rb_table[rb_table_index]>(frame_parms->N_RB_UL-first_rb[CC_id]-1)) {
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_assigned_mcs_ul=mcs;
UE_template->pre_allocated_rb_table_index_ul=rb_table_index;
UE_template->pre_allocated_nb_rb_ul= 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,
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)) {
UE_template->pre_allocated_rb_table_index_ul = 2;
UE_template->pre_allocated_nb_rb_ul = 3;
} else {
UE_template->pre_allocated_rb_table_index_ul=-1;
UE_template->pre_allocated_nb_rb_ul=0;
}
}
}
}
}
struct sort_ue_ul_params {
int module_idP;
int frameP;
int subframeP;
};
static int ue_ul_compare(const void *_a, const void *_b, void *_params)
{
struct sort_ue_ul_params *params = _params;
UE_list_t *UE_list = &eNB_mac_inst[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;
if (UE_list->UE_template[pCCid1][UE_id1].ul_total_buffer > UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer)
return -1;
if (UE_list->UE_template[pCCid1][UE_id1].ul_total_buffer < UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer)
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;
return 0;
#if 0
/* The above order derives from the following.
* The last case is not handled: "if (UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer > 0 )"
* I don't think it makes a big difference.
*/
if(round2 > round1) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (round2 == round1) {
if (UE_list->UE_template[pCCid1][UE_id1].ul_buffer_info[LCGID0] < UE_list->UE_template[pCCid2][UE_id2].ul_buffer_info[LCGID0]) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (UE_list->UE_template[pCCid1][UE_id1].ul_total_buffer < UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (UE_list->UE_template[pCCid1][UE_id1].pre_assigned_mcs_ul < UE_list->UE_template[pCCid2][UE_id2].pre_assigned_mcs_ul) {
if (UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer > 0 ) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
}
}
}
#endif
}
void sort_ue_ul (module_id_t module_idP,int frameP, sub_frame_t subframeP)
{
int i;
int list[NUMBER_OF_UE_MAX];
int list_size = 0;
int rnti;
struct sort_ue_ul_params params = { module_idP, frameP, subframeP };
UE_list_t *UE_list = &eNB_mac_inst[module_idP].UE_list;
for (i = 0; i < NUMBER_OF_UE_MAX; 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;
if (!phy_stats_exist(module_idP, rnti))
continue;
list[list_size] = i;
list_size++;
}
qsort_r(list, list_size, sizeof(int), ue_ul_compare, &params);
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;
}
#if 0
int UE_id1,UE_id2;
int pCCid1,pCCid2;
int round1,round2;
int i=0,ii=0;
rnti_t rnti1,rnti2;
UE_list_t *UE_list = &eNB_mac_inst[module_idP].UE_list;
for (i=UE_list->head_ul; i>=0; i=UE_list->next_ul[i]) {
//LOG_I(MAC,"sort ue ul i %d\n",i);
for (ii=UE_list->next_ul[i]; ii>=0; ii=UE_list->next_ul[ii]) {
//LOG_I(MAC,"sort ul ue 2 ii %d\n",ii);
UE_id1 = i;
rnti1 = UE_RNTI(module_idP,UE_id1);
if(rnti1 == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[i].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(module_idP, rnti1))
continue;
pCCid1 = UE_PCCID(module_idP,UE_id1);
round1 = maxround(module_idP,rnti1,frameP,subframeP,1);
UE_id2 = ii;
rnti2 = UE_RNTI(module_idP,UE_id2);
if(rnti2 == NOT_A_RNTI)
continue;
if (UE_list->UE_sched_ctrl[UE_id2].ul_out_of_sync == 1)
continue;
if (!phy_stats_exist(module_idP, rnti2))
continue;
pCCid2 = UE_PCCID(module_idP,UE_id2);
round2 = maxround(module_idP,rnti2,frameP,subframeP,1);
if(round2 > round1) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (round2 == round1) {
if (UE_list->UE_template[pCCid1][UE_id1].ul_buffer_info[LCGID0] < UE_list->UE_template[pCCid2][UE_id2].ul_buffer_info[LCGID0]) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (UE_list->UE_template[pCCid1][UE_id1].ul_total_buffer < UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
} else if (UE_list->UE_template[pCCid1][UE_id1].pre_assigned_mcs_ul < UE_list->UE_template[pCCid2][UE_id2].pre_assigned_mcs_ul) {
if (UE_list->UE_template[pCCid2][UE_id2].ul_total_buffer > 0 ) {
swap_UEs(UE_list,UE_id1,UE_id2,1);
}
}
}
}
}
#endif
}
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