eNB_scheduler.c 25.3 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
 * 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
 */
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/*! \file eNB_scheduler.c
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 * \brief eNB scheduler top level function operates on per subframe basis
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 * \author  Navid Nikaein and Raymond Knopp
 * \date 2010 - 2014
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 * \email: navid.nikaein@eurecom.fr
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 * \version 0.5
 * @ingroup _mac
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 */
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#include "assertions.h"
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#include "PHY/defs.h"
#include "PHY/extern.h"

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

#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/extern.h"
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#include "LAYER2/MAC/proto.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"
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#include "RRC/LITE/extern.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
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//#include "LAYER2/MAC/pre_processor.c"
#include "pdcp.h"
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#if defined(FLEXRAN_AGENT_SB_IF)
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//Agent-related headers
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#include "flexran_agent_extern.h"
#include "flexran_agent_mac.h"
#include "flexran_agent_mac_proto.h"
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#endif
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#if defined(ENABLE_ITTI)
# include "intertask_interface.h"
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#endif

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#define ENABLE_MAC_PAYLOAD_DEBUG
#define DEBUG_eNB_SCHEDULER 1
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extern RAN_CONTEXT_t RC;
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uint16_t pdcch_order_table[6] = {31,31,511,2047,2047,8191};

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void schedule_SRS(module_id_t module_idP,frame_t frameP,sub_frame_t subframeP) {

  eNB_MAC_INST                   *eNB            = RC.mac[module_idP];
  UE_list_t                      *UE_list        = &eNB->UE_list;
  nfapi_ul_config_request_body_t *ul_req;
  int CC_id,UE_id;  
  COMMON_channels_t                   *cc        = RC.mac[module_idP]->common_channels;
  SoundingRS_UL_ConfigCommon_t      *soundingRS_UL_ConfigCommon;
  struct SoundingRS_UL_ConfigDedicated     *soundingRS_UL_ConfigDedicated;
  uint8_t  TSFC;
  uint16_t deltaTSFC; // bitmap
  uint8_t  srs_SubframeConfig;
  
  // table for TSFC (Period) and deltaSFC (offset)
  const uint16_t deltaTSFCTabType1[15][2] = { {1,1},{1,2},{2,2},{1,5},{2,5},{4,5},{8,5},{3,5},{12,5},{1,10},{2,10},{4,10},{8,10},{351,10},{383,10} };      // Table 5.5.3.3-2 3GPP 36.211 FDD
  const uint16_t deltaTSFCTabType2[14][2] = { {2,5},{6,5},{10,5},{18,5},{14,5},{22,5},{26,5},{30,5},{70,10},{74,10},{194,10},{326,10},{586,10},{210,10} }; // Table 5.5.3.3-2 3GPP 36.211 TDD

  uint16_t srsPeriodicity,srsOffset;

  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
    soundingRS_UL_ConfigCommon = &cc[CC_id].radioResourceConfigCommon->soundingRS_UL_ConfigCommon;
    // check if SRS is enabled in this frame/subframe
    if (soundingRS_UL_ConfigCommon) {
      srs_SubframeConfig = soundingRS_UL_ConfigCommon->choice.setup.srs_SubframeConfig;
      if (cc[CC_id].tdd_Config == NULL) { // FDD
	deltaTSFC = deltaTSFCTabType1[srs_SubframeConfig][0];
	TSFC      = deltaTSFCTabType1[srs_SubframeConfig][1];
      }
      else { // TDD
	deltaTSFC = deltaTSFCTabType2[srs_SubframeConfig][0];
	TSFC      = deltaTSFCTabType2[srs_SubframeConfig][1];
      }
      // Sounding reference signal subframes are the subframes satisfying ns/2 mod TSFC (- deltaTSFC
      uint16_t tmp = (subframeP %  TSFC);

      if((1<<tmp) & deltaTSFC) {
	// This is an SRS subframe, loop over UEs
	for (UE_id=UE_list->head; UE_id>=0; UE_id=UE_list->next[UE_id]) {
	  
	  ul_req        = &RC.mac[module_idP]->UL_req[CC_id].ul_config_request_body;
	  
	  
	  AssertFatal(UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated != NULL, "physicalConfigDedicated is null for UE %d\n",UE_id);
	  
	  if ((soundingRS_UL_ConfigDedicated = UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->soundingRS_UL_ConfigDedicated)!=NULL) {
	    if (soundingRS_UL_ConfigDedicated->present == SoundingRS_UL_ConfigDedicated_PR_setup) {
	      get_srs_pos(&cc[CC_id], soundingRS_UL_ConfigDedicated->choice.setup.srs_ConfigIndex, &srsPeriodicity, &srsOffset);
	      if (((10*frameP+subframeP) % srsPeriodicity) == srsOffset) {
		// Prorgram SRS
		ul_req->srs_present                                                 = 1;
		nfapi_ul_config_request_pdu_t* ul_config_pdu                        = &ul_req->ul_config_pdu_list[ul_req->number_of_pdus]; 
		memset((void*)ul_config_pdu,0,sizeof(nfapi_ul_config_request_pdu_t));
		ul_config_pdu->pdu_type                                             = NFAPI_UL_CONFIG_SRS_PDU_TYPE;
		ul_config_pdu->pdu_size                                             = 2+(uint8_t)(2+sizeof(nfapi_ul_config_srs_pdu));
		ul_config_pdu->srs_pdu.srs_pdu_rel8.size                            = (uint8_t)sizeof(nfapi_ul_config_srs_pdu);;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.rnti                            = UE_list->UE_template[CC_id][UE_id].rnti;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.srs_bandwidth                   = soundingRS_UL_ConfigDedicated->choice.setup.srs_Bandwidth;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.frequency_domain_position       = soundingRS_UL_ConfigDedicated->choice.setup.freqDomainPosition;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.srs_hopping_bandwidth           = soundingRS_UL_ConfigDedicated->choice.setup.srs_HoppingBandwidth;;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.transmission_comb               = soundingRS_UL_ConfigDedicated->choice.setup.transmissionComb;
		ul_config_pdu->srs_pdu.srs_pdu_rel8.i_srs                           = soundingRS_UL_ConfigDedicated->choice.setup.srs_ConfigIndex;	
		ul_config_pdu->srs_pdu.srs_pdu_rel8.sounding_reference_cyclic_shift = soundingRS_UL_ConfigDedicated->choice.setup.cyclicShift;	
		//		ul_config_pdu->srs_pdu.srs_pdu_rel10.antenna_port                   = ;//
		//		ul_config_pdu->srs_pdu.srs_pdu_rel13.number_of_combs                = ;//
		RC.mac[module_idP]->UL_req[CC_id].sfn_sf = (frameP<<4)+subframeP;
		ul_req->number_of_pdus++;
	      } // if (((10*frameP+subframeP) % srsPeriodicity) == srsOffset) 
	    } // if (soundingRS_UL_ConfigDedicated->present == SoundingRS_UL_ConfigDedicated_PR_setup) 
	  } // if ((soundingRS_UL_ConfigDedicated = UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->soundingRS_UL_ConfigDedicated)!=NULL) 
	} // for (UE_id ...
      } // if((1<<tmp) & deltaTSFC)

    }// SRS config
  }
}

void schedule_CSI(module_id_t module_idP,frame_t frameP,sub_frame_t subframeP) { 

  eNB_MAC_INST                   *eNB          = RC.mac[module_idP];
  UE_list_t                      *UE_list      = &eNB->UE_list;
  COMMON_channels_t              *cc;
  nfapi_ul_config_request_body_t *ul_req;
  int CC_id,UE_id;  
  struct CQI_ReportPeriodic *cqi_ReportPeriodic;
  uint16_t Npd,N_OFFSET_CQI;
  int H;

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

    cc = &eNB->common_channels[CC_id];
    for (UE_id=UE_list->head; UE_id>=0; UE_id=UE_list->next[UE_id]) {

      ul_req        = &RC.mac[module_idP]->UL_req[CC_id].ul_config_request_body;

      AssertFatal(UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated != NULL, "physicalConfigDedicated is null for UE %d\n",UE_id);

      if (UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->cqi_ReportConfig) {
	if ((cqi_ReportPeriodic = UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->cqi_ReportConfig->cqi_ReportPeriodic)!=NULL &&
	    (cqi_ReportPeriodic->present!=CQI_ReportPeriodic_PR_release)) {
	  //Rel8 Periodic CQI/PMI/RI reporting

	  get_csi_params(cc,cqi_ReportPeriodic,&Npd,&N_OFFSET_CQI,&H);
	  
	  if ((((frameP*10)+subframeP)%Npd) == N_OFFSET_CQI) {  // CQI opportunity
	    UE_list->UE_sched_ctrl[UE_id].feedback_cnt[CC_id]=(((frameP*10)+subframeP)/Npd)%H;
	    // Program CQI
	    nfapi_ul_config_request_pdu_t* ul_config_pdu                                     = &ul_req->ul_config_pdu_list[ul_req->number_of_pdus]; 
	    memset((void*)ul_config_pdu,0,sizeof(nfapi_ul_config_request_pdu_t));
	    ul_config_pdu->pdu_type                                                          = NFAPI_UL_CONFIG_UCI_CQI_PDU_TYPE;
	    ul_config_pdu->pdu_size                                                          = 2+(uint8_t)(2+sizeof(nfapi_ul_config_uci_cqi_pdu));
	    ul_config_pdu->uci_cqi_pdu.ue_information.ue_information_rel8.rnti               = UE_list->UE_template[CC_id][UE_id].rnti;
	    ul_config_pdu->uci_cqi_pdu.cqi_information.cqi_information_rel8.pucch_index      = cqi_ReportPeriodic->choice.setup.cqi_PUCCH_ResourceIndex;
	    ul_config_pdu->uci_cqi_pdu.cqi_information.cqi_information_rel8.dl_cqi_pmi_size  = get_rel8_dl_cqi_pmi_size(&UE_list->UE_sched_ctrl[UE_id],
															CC_id,
															cc,
															get_tmode(module_idP,CC_id,UE_id),
															cqi_ReportPeriodic);
	    ul_req->number_of_pdus++;

#if defined(Rel10) || defined(Rel14)
	    // PUT rel10-13 UCI options here
#endif	    
	  }
	  else if ((cqi_ReportPeriodic->choice.setup.ri_ConfigIndex) &&
		   ((((frameP*10)+subframeP)%((H*Npd)<<(*cqi_ReportPeriodic->choice.setup.ri_ConfigIndex/161)))==
		    N_OFFSET_CQI + (*cqi_ReportPeriodic->choice.setup.ri_ConfigIndex%161))) {  // RI opportunity
	    // Program RI
	    nfapi_ul_config_request_pdu_t* ul_config_pdu                                     = &ul_req->ul_config_pdu_list[ul_req->number_of_pdus]; 
	    memset((void*)ul_config_pdu,0,sizeof(nfapi_ul_config_request_pdu_t));
	    ul_config_pdu->pdu_type                                                          = NFAPI_UL_CONFIG_UCI_CQI_PDU_TYPE;
	    ul_config_pdu->pdu_size                                                          = 2+(uint8_t)(2+sizeof(nfapi_ul_config_uci_cqi_pdu));
	    ul_config_pdu->uci_cqi_pdu.ue_information.ue_information_rel8.rnti               = UE_list->UE_template[CC_id][UE_id].rnti;
	    ul_config_pdu->uci_cqi_pdu.cqi_information.cqi_information_rel8.pucch_index      = cqi_ReportPeriodic->choice.setup.cqi_PUCCH_ResourceIndex;
	    ul_config_pdu->uci_cqi_pdu.cqi_information.cqi_information_rel8.dl_cqi_pmi_size  = (cc->p_eNB==2)?1:2;
	    RC.mac[module_idP]->UL_req[CC_id].sfn_sf = (frameP<<4)+subframeP;
	    ul_req->number_of_pdus++;
	  }

	} // if ((cqi_ReportPeriodic = cqi_ReportConfig->cqi_ReportPeriodic)!=NULL) {
      } // if (UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->cqi_ReportConfig)
    } // for (UE_id=UE_list->head; UE_id>=0; UE_id=UE_list->next[UE_id]) {
  } // for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
}

void schedule_SR(module_id_t module_idP,frame_t frameP,sub_frame_t subframeP) {

  eNB_MAC_INST                   *eNB          = RC.mac[module_idP];
  UE_list_t                      *UE_list      = &eNB->UE_list;
  nfapi_ul_config_request_body_t *ul_req;
  int CC_id,UE_id;  
  SchedulingRequestConfig_t      *SRconfig;

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

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

      ul_req        = &RC.mac[module_idP]->UL_req[CC_id].ul_config_request_body;


      AssertFatal(UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated != NULL, "physicalConfigDedicated is null for UE %d\n",UE_id);

      if ((SRconfig = UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->schedulingRequestConfig)!=NULL) {
	if (SRconfig->present == SchedulingRequestConfig_PR_setup) {

	  
	  if (SRconfig->choice.setup.sr_ConfigIndex <= 4) {        // 5 ms SR period
	    if ((subframeP%5) != SRconfig->choice.setup.sr_ConfigIndex)
	      continue;
	  } else if (SRconfig->choice.setup.sr_ConfigIndex <= 14) { // 10 ms SR period
	    if (subframeP!=(SRconfig->choice.setup.sr_ConfigIndex-5))
	      continue;
	  } else if (SRconfig->choice.setup.sr_ConfigIndex <= 34) { // 20 ms SR period
	    if ((10*(frameP&1)+subframeP) != (SRconfig->choice.setup.sr_ConfigIndex-15))
	      continue;
	  } else if (SRconfig->choice.setup.sr_ConfigIndex <= 74) { // 40 ms SR period
	    if ((10*(frameP&3)+subframeP) != (SRconfig->choice.setup.sr_ConfigIndex-35))
	      continue;
	  } else if (SRconfig->choice.setup.sr_ConfigIndex <= 154) { // 80 ms SR period
	    if ((10*(frameP&7)+subframeP) != (SRconfig->choice.setup.sr_ConfigIndex-75))
	      continue;
	  }	  
	} // SRconfig->present == SchedulingRequestConfig_PR_setup)
      } // SRconfig = UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->schedulingRequestConfig)!=NULL) 

      // if we get here there is some PUCCH1 reception to schedule for SR

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      int skip_ue=0;
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      // check that there is no existing UL grant for ULSCH which overrides the SR
      for (int i=0;i<ul_req->number_of_pdus;i++)
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	if (((ul_req->ul_config_pdu_list[i].pdu_type == NFAPI_UL_CONFIG_ULSCH_PDU_TYPE)||
	     (ul_req->ul_config_pdu_list[i].pdu_type == NFAPI_UL_CONFIG_ULSCH_HARQ_PDU_TYPE)||
	     (ul_req->ul_config_pdu_list[i].pdu_type == NFAPI_UL_CONFIG_ULSCH_CQI_RI_PDU_TYPE)||
	     (ul_req->ul_config_pdu_list[i].pdu_type == NFAPI_UL_CONFIG_ULSCH_CQI_HARQ_RI_PDU_TYPE))&&
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	    (ul_req->ul_config_pdu_list[i].ulsch_pdu.ulsch_pdu_rel8.rnti == UE_list->UE_template[CC_id][UE_id].rnti)) {
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	    skip_ue=1;
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	    break;
	}
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	else if ((ul_req->ul_config_pdu_list[i].pdu_type == NFAPI_UL_CONFIG_UCI_HARQ_PDU_TYPE)&&
		 (ul_req->ul_config_pdu_list[i].ulsch_pdu.ulsch_pdu_rel8.rnti == UE_list->UE_template[CC_id][UE_id].rnti))
	  skip_ue=1;
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      // drop the allocation because ULSCH with handle it with BSR
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      if (skip_ue==1) continue;
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      // drop the allocation if the UE hasn't send RRCConnectionSetupComplete yet
      if (mac_eNB_get_rrc_status(module_idP,UE_RNTI(module_idP,UE_id)) < RRC_CONNECTED) continue;
       
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      // if we get here then there is no UL grant so program the SR
      ul_req->ul_config_pdu_list[ul_req->number_of_pdus].pdu_type                                                 = NFAPI_UL_CONFIG_UCI_SR_PDU_TYPE;
      ul_req->ul_config_pdu_list[ul_req->number_of_pdus].uci_sr_pdu.ue_information.ue_information_rel8.rnti = UE_list->UE_template[CC_id][UE_id].rnti;

      // check Rel10 or Rel8 SR
#if defined(Rel10) || defined(Rel14)
      if ((UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->ext2) &&
	  (UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->ext2->schedulingRequestConfig_v1020)&&
	  (UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->ext2->schedulingRequestConfig_v1020)) {

	ul_req->ul_config_pdu_list[ul_req->number_of_pdus].uci_sr_pdu.sr_information.sr_information_rel10.number_of_pucch_resources = 1;
	ul_req->ul_config_pdu_list[ul_req->number_of_pdus].uci_sr_pdu.sr_information.sr_information_rel10.pucch_index_p1 = 
	  *UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->ext2->schedulingRequestConfig_v1020->sr_PUCCH_ResourceIndexP1_r10;


      }
      else 
#endif
	{
	  ul_req->ul_config_pdu_list[ul_req->number_of_pdus].uci_sr_pdu.sr_information.sr_information_rel8.pucch_index =  
	    UE_list->UE_template[CC_id][UE_id].physicalConfigDedicated->schedulingRequestConfig->choice.setup.sr_PUCCH_ResourceIndex;
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	  LOG_D(MAC,"Frame %d, Subframe %d : Scheduling SR for UE %d/%x\n",frameP,subframeP,UE_id,UE_list->UE_template[CC_id][UE_id].rnti);
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	}
      RC.mac[module_idP]->UL_req[CC_id].sfn_sf = (frameP<<4)+subframeP;
      ul_req->number_of_pdus++;
    } // for (UE_id=UE_list->head; UE_id>=0; UE_id=UE_list->next[UE_id])
  } // for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++)
}

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void check_ul_failure(module_id_t module_idP,int CC_id,int UE_id,
		      frame_t frameP, sub_frame_t subframeP) {

  UE_list_t                           *UE_list      = &RC.mac[module_idP]->UE_list;
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  nfapi_dl_config_request_t           *DL_req       = &RC.mac[module_idP]->DL_req[0];
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  uint16_t                            rnti          = UE_RNTI(module_idP,UE_id);
  COMMON_channels_t                   *cc           = RC.mac[module_idP]->common_channels;

  // check uplink failure
  if ((UE_list->UE_sched_ctrl[UE_id].ul_failure_timer>0)&&
      (UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync==0)) {
    LOG_D(MAC,"UE %d rnti %x: UL Failure timer %d \n",UE_id,rnti,UE_list->UE_sched_ctrl[UE_id].ul_failure_timer);
    if (UE_list->UE_sched_ctrl[UE_id].ra_pdcch_order_sent==0) {
      UE_list->UE_sched_ctrl[UE_id].ra_pdcch_order_sent=1;
      
      // add a format 1A dci for this UE to request an RA procedure (only one UE per subframe)
      LOG_D(MAC,"UE %d rnti %x: sending PDCCH order for RAPROC (failure timer %d) \n",UE_id,rnti,UE_list->UE_sched_ctrl[UE_id].ul_failure_timer);	    
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      nfapi_dl_config_request_pdu_t* dl_config_pdu                    = &DL_req[CC_id].dl_config_request_body.dl_config_pdu_list[DL_req[CC_id].dl_config_request_body.number_pdu]; 
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      memset((void*)dl_config_pdu,0,sizeof(nfapi_dl_config_request_pdu_t));
      dl_config_pdu->pdu_type                                         = NFAPI_DL_CONFIG_DCI_DL_PDU_TYPE; 
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      dl_config_pdu->pdu_size                                         = (uint8_t)(2+sizeof(nfapi_dl_config_dci_dl_pdu));
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      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.dci_format            = NFAPI_DL_DCI_FORMAT_1A;
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      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.aggregation_level     = get_aggregation(get_bw_index(module_idP,CC_id),UE_list->UE_sched_ctrl[UE_id].dl_cqi[CC_id],format1A);
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      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti                  = rnti;
      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.rnti_type             = 1;    // CRNTI : see Table 4-10 from SCF082 - nFAPI specifications
      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.transmission_power    = 6000; // equal to RS power
      
      AssertFatal((cc[CC_id].mib->message.dl_Bandwidth >=0) && (cc[CC_id].mib->message.dl_Bandwidth<6),
		  "illegal dl_Bandwidth %d\n",(int)cc[CC_id].mib->message.dl_Bandwidth);
      dl_config_pdu->dci_dl_pdu.dci_dl_pdu_rel8.resource_block_coding = pdcch_order_table[cc[CC_id].mib->message.dl_Bandwidth];
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      DL_req[CC_id].dl_config_request_body.number_dci++;
      DL_req[CC_id].dl_config_request_body.number_pdu++;
     
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      /* 
	 add_ue_spec_dci(&DL_req[CC_id],
	 rnti,
	 get_aggregation(get_tw_index(module_idP,CC_id),eNB_UE_stats->DL_cqi[0],format1A),
	 format1A,
	 NO_DLSCH);*/
    }
    else { // ra_pdcch_sent==1
      LOG_D(MAC,"UE %d rnti %x: sent PDCCH order for RAPROC waiting (failure timer %d) \n",UE_id,rnti,UE_list->UE_sched_ctrl[UE_id].ul_failure_timer);	    	    
      if ((UE_list->UE_sched_ctrl[UE_id].ul_failure_timer % 40) == 0)
	UE_list->UE_sched_ctrl[UE_id].ra_pdcch_order_sent=0; // resend every 4 frames	      
    }
    
    UE_list->UE_sched_ctrl[UE_id].ul_failure_timer++;
    // check threshold
    if (UE_list->UE_sched_ctrl[UE_id].ul_failure_timer > 200) {
      // inform RRC of failure and clear timer
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      LOG_D(MAC,"UE %d rnti %x: UL Failure after repeated PDCCH orders: Triggering RRC \n",UE_id,rnti);
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      mac_eNB_rrc_ul_failure(module_idP,CC_id,frameP,subframeP,rnti);
      UE_list->UE_sched_ctrl[UE_id].ul_failure_timer=0;
      UE_list->UE_sched_ctrl[UE_id].ul_out_of_sync=1;
    }
  } // ul_failure_timer>0
  
}

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void clear_nfapi_information(eNB_MAC_INST *eNB,int CC_idP,frame_t frameP,sub_frame_t subframeP) {

  nfapi_dl_config_request_t *DL_req         = &eNB->DL_req[0];
  nfapi_ul_config_request_t *UL_req         = &eNB->UL_req[0];
  nfapi_hi_dci0_request_t   *HI_DCI0_req    = &eNB->HI_DCI0_req[0];
  nfapi_tx_request_t        *TX_req         = &eNB->TX_req[0];
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  eNB->pdu_index[CC_idP]                                     = 0;
  DL_req[CC_idP].dl_config_request_body.number_pdcch_ofdm_symbols           = 1;
  DL_req[CC_idP].dl_config_request_body.number_dci                          = 0;
  DL_req[CC_idP].dl_config_request_body.number_pdu                          = 0;
  DL_req[CC_idP].dl_config_request_body.number_pdsch_rnti                   = 0;
  DL_req[CC_idP].dl_config_request_body.transmission_power_pcfich           = 6000;
  
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  HI_DCI0_req[CC_idP].hi_dci0_request_body.sfnsf                            = subframeP + (frameP<<4);
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  HI_DCI0_req[CC_idP].hi_dci0_request_body.number_of_dci                    = 0;
  
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  UL_req[CC_idP].ul_config_request_body.number_of_pdus                      = 0;
  UL_req[CC_idP].ul_config_request_body.rach_prach_frequency_resources      = 0; // ignored, handled by PHY for now
  UL_req[CC_idP].ul_config_request_body.srs_present                         = 0; // ignored, handled by PHY for now
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  TX_req[CC_idP].tx_request_body.number_of_pdus                 = 0;

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}

void copy_ulreq(module_id_t module_idP,frame_t frameP, sub_frame_t subframeP) {

  int CC_id;
  eNB_MAC_INST *eNB;
  nfapi_ul_config_request_body_t *ul_req_tmp;
  nfapi_ul_config_request_body_t *ul_req;

  eNB = RC.mac[module_idP];

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

    ul_req_tmp       = &eNB->UL_req_tmp[CC_id][subframeP].ul_config_request_body;
    ul_req           = &eNB->UL_req[CC_id].ul_config_request_body;
    
    eNB->UL_req[CC_id].sfn_sf   = (frameP<<4) + subframeP;
    ul_req->number_of_pdus                     = ul_req_tmp->number_of_pdus;
    ul_req_tmp->number_of_pdus = 0;

    memcpy((void*)ul_req->ul_config_pdu_list,
	   (void*)ul_req_tmp->ul_config_pdu_list,
	   ul_req->number_of_pdus*sizeof(nfapi_ul_config_request_pdu_t));
  
  }
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}

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void eNB_dlsch_ulsch_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP)  
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{
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  int mbsfn_status[MAX_NUM_CCs];
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  protocol_ctxt_t   ctxt;
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  int CC_id,i; //,next_i;
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  UE_list_t *UE_list=&RC.mac[module_idP]->UE_list;
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  rnti_t rnti;
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  COMMON_channels_t         *cc             = RC.mac[module_idP]->common_channels;
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  eNB_UE_STATS              *eNB_UE_stats;
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#if defined(FLEXRAN_AGENT_SB_IF)
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  Protocol__FlexranMessage *msg;
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#endif
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  start_meas(&RC.mac[module_idP]->eNB_scheduler);
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_ULSCH_SCHEDULER,VCD_FUNCTION_IN);
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  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
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    mbsfn_status[CC_id]=0;
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    // clear vrb_maps
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    memset(cc[CC_id].vrb_map,0,100);
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    memset(cc[CC_id].vrb_map_UL,0,100);
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#if defined(Rel10) || defined(Rel14)
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    cc[CC_id].mcch_active =0;
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#endif
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    RC.mac[module_idP]->frame    = frameP;
    RC.mac[module_idP]->subframe = subframeP;
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    clear_nfapi_information(RC.mac[module_idP],CC_id,frameP,subframeP);
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  }

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  // refresh UE list based on UEs dropped by PHY in previous subframe
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  for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
    if (UE_list->active[i] != TRUE) continue;
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    rnti         = UE_RNTI(module_idP, i);
    CC_id        = UE_PCCID(module_idP, i);
    eNB_UE_stats = &RC.mac[module_idP]->UE_list.eNB_UE_stats[CC_id][i];

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    if ((frameP==0)&&(subframeP==0)) {
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      LOG_D(MAC,"UE  rnti %x : %s, PHR %d dB CQI %d\n", rnti,
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            UE_list->UE_sched_ctrl[i].ul_out_of_sync==0 ? "in synch" : "out of sync",
            UE_list->UE_template[CC_id][i].phr_info,
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            UE_list->UE_sched_ctrl[i].dl_cqi[CC_id]);
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    }
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    RC.eNB[module_idP][CC_id]->pusch_stats_bsr[i][(frameP*10)+subframeP]=-63;
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    if (i==UE_list->head)
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      VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME(VCD_SIGNAL_DUMPER_VARIABLES_UE0_BSR,RC.eNB[module_idP][CC_id]->pusch_stats_bsr[i][(frameP*10)+subframeP]); 
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    // increment this, it is cleared when we receive an sdu
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    RC.mac[module_idP]->UE_list.UE_sched_ctrl[i].ul_inactivity_timer++;
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    RC.mac[module_idP]->UE_list.UE_sched_ctrl[i].cqi_req_timer++;
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    LOG_D(MAC,"UE %d/%x : ul_inactivity %d, cqi_req %d\n",i,rnti, 
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	  RC.mac[module_idP]->UE_list.UE_sched_ctrl[i].ul_inactivity_timer,
	  RC.mac[module_idP]->UE_list.UE_sched_ctrl[i].cqi_req_timer);
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    check_ul_failure(module_idP,CC_id,i,frameP,subframeP);

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  }
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  PROTOCOL_CTXT_SET_BY_MODULE_ID(&ctxt, module_idP, ENB_FLAG_YES, NOT_A_RNTI, frameP, subframeP,module_idP);
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  pdcp_run(&ctxt);
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  rrc_rx_tx(&ctxt,
            0, // eNB index, unused in eNB
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            CC_id);
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#if defined(Rel10) || defined(Rel14)
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  for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
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    if (cc[CC_id].MBMS_flag >0) {
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      start_meas(&RC.mac[module_idP]->schedule_mch);
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      mbsfn_status[CC_id] = schedule_MBMS(module_idP,CC_id,frameP,subframeP);
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      stop_meas(&RC.mac[module_idP]->schedule_mch);
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    }
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  }
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#endif
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  // This schedules MIB
  if ((subframeP==0) && (frameP&3) == 0) schedule_mib(module_idP,frameP,subframeP);
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  // This schedules SI for legacy LTE and eMTC starting in subframeP
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  schedule_SI(module_idP,frameP,subframeP);
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  // This schedules Random-Access for legacy LTE and eMTC starting in subframeP
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  schedule_RA(module_idP,frameP,subframeP);
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  // copy previously scheduled UL resources (ULSCH + HARQ)
  copy_ulreq(module_idP,frameP,subframeP);
  // This schedules SRS in subframeP
  schedule_SRS(module_idP,frameP,subframeP);
  // This schedules ULSCH in subframeP (dci0)
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  schedule_ulsch(module_idP,frameP,subframeP);
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  // This schedules UCI_SR in subframeP
  schedule_SR(module_idP,frameP,subframeP);
  // This schedules UCI_CSI in subframeP
  schedule_CSI(module_idP, frameP, subframeP);
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  // This schedules DLSCH in subframeP
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  schedule_ue_spec(module_idP,frameP,subframeP,mbsfn_status);

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  // Allocate CCEs for good after scheduling is done
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  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) allocate_CCEs(module_idP,CC_id,subframeP,0);
  
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  stop_meas(&RC.mac[module_idP]->eNB_scheduler);
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  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_ULSCH_SCHEDULER,VCD_FUNCTION_OUT);
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}
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