eNB_scheduler_primitives.c 52.1 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_primitives.c
 * \brief primitives used by eNB for BCH, RACH, ULSCH, DLSCH scheduling
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 * \author  Navid Nikaein and Raymond Knopp
 * \date 2010 - 2014
 * \email: navid.nikaein@eurecom.fr
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 * \version 1.0
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 * @ingroup _mac

 */

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

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

#include "LAYER2/MAC/defs.h"
#include "LAYER2/MAC/extern.h"

#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"

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

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

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

#define ENABLE_MAC_PAYLOAD_DEBUG
#define DEBUG_eNB_SCHEDULER 1

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int to_prb(int dl_Bandwidth) {
  int prbmap[6] = {6,15,25,50,75,100};
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  AssertFatal(dl_Bandwidth < 6,"dl_Bandwidth is 0..5\n");
  return(prbmap[dl_Bandwidth]);
}

int to_rbg(int dl_Bandwidth) {
  int rbgmap[6] = {6,8,13,17,19,25};

  AssertFatal(dl_Bandwidth < 6,"dl_Bandwidth is 0..5\n");
  return(rbgmap[dl_Bandwidth]);
}
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int get_phich_resource_times6(COMMON_channels_t *cc) {
  int phichmap[4] = {1,3,6,12};
  AssertFatal(cc!=NULL,"cc is null\n");
  AssertFatal(cc->mib!=NULL,"cc->mib is null\n");
  AssertFatal((cc->mib->message.phich_Config.phich_Resource>=0) && 
	      (cc->mib->message.phich_Config.phich_Resource<4),
	      "phich_Resource %d not in 0..3\n",(int)cc->mib->message.phich_Config.phich_Resource);

  return(phichmap[cc->mib->message.phich_Config.phich_Resource]);
}

uint16_t mac_computeRIV(uint16_t N_RB_DL,uint16_t RBstart,uint16_t Lcrbs) {

  uint16_t RIV;

  if (Lcrbs<=(1+(N_RB_DL>>1)))
    RIV = (N_RB_DL*(Lcrbs-1)) + RBstart;
  else
    RIV = (N_RB_DL*(N_RB_DL+1-Lcrbs)) + (N_RB_DL-1-RBstart);

  return(RIV);
}

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void get_Msg3alloc(COMMON_channels_t *cc,
		   unsigned char current_subframe,
		   unsigned int current_frame,
		   unsigned int *frame,
		   unsigned char *subframe)
{

  // Fill in other TDD Configuration!!!!

  if (cc->tdd_Config==NULL) { // FDD
    *subframe = current_subframe+6;

    if (*subframe>9) {
      *subframe = *subframe-10;
      *frame = (current_frame+1) & 1023;
    } else {
      *frame=current_frame;
    }
  } else { // TDD
    if (cc->tdd_Config->subframeAssignment == 1) {
      switch (current_subframe) {

      case 0:
        *subframe = 7;
        *frame = current_frame;
        break;

      case 4:
        *subframe = 2;
        *frame = (current_frame+1) & 1023;
        break;

      case 5:
        *subframe = 2;
        *frame = (current_frame+1) & 1023;
        break;

      case 9:
        *subframe = 7;
        *frame = (current_frame+1) & 1023;
        break;
      }
    } else if (cc->tdd_Config->subframeAssignment == 3) {
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
        *subframe = 2;
        *frame = (current_frame+1) & 1023;
        break;

      case 7:
        *subframe = 3;
        *frame = (current_frame+1) & 1023;
        break;

      case 8:
        *subframe = 4;
        *frame = (current_frame+1) & 1023;
        break;

      case 9:
        *subframe = 2;
        *frame = (current_frame+2) & 1023;
        break;
      }
    } else if (cc->tdd_Config->subframeAssignment == 4) {
        switch (current_subframe) {

        case 0:
        case 4:
        case 5:
        case 6:
          *subframe = 2;
          *frame = (current_frame+1) & 1023;
          break;

        case 7:
          *subframe = 3;
          *frame = (current_frame+1) & 1023;
          break;

        case 8:
        case 9:
          *subframe = 2;
          *frame = (current_frame+2) & 1023;
          break;
        }
      } else if (cc->tdd_Config->subframeAssignment == 5) {
          switch (current_subframe) {

          case 0:
          case 4:
          case 5:
          case 6:
            *subframe = 2;
            *frame = (current_frame+1) & 1023;
            break;

          case 7:
          case 8:
          case 9:
            *subframe = 2;
            *frame = (current_frame+2) & 1023;
            break;
          }
        }
  }
}

void get_Msg3allocret(COMMON_channels_t *cc,
		      unsigned char current_subframe,
		      unsigned int current_frame,
		      unsigned int *frame,
		      unsigned char *subframe)
{
  if (cc->tdd_Config == NULL) { //FDD
    /* always retransmit in n+8 */
    *subframe = current_subframe + 8;

    if (*subframe > 9) {
      *subframe = *subframe - 10;
      *frame = (current_frame + 1) & 1023;
    } else {
      *frame = current_frame;
    }
  } else {
    if (cc->tdd_Config->subframeAssignment == 1) {
      // original PUSCH in 2, PHICH in 6 (S), ret in 2
      // original PUSCH in 3, PHICH in 9, ret in 3
      // original PUSCH in 7, PHICH in 1 (S), ret in 7
      // original PUSCH in 8, PHICH in 4, ret in 8
      *frame = (current_frame+1) & 1023;
    } else if (cc->tdd_Config->subframeAssignment == 3) {
      // original PUSCH in 2, PHICH in 8, ret in 2 next frame
      // original PUSCH in 3, PHICH in 9, ret in 3 next frame
      // original PUSCH in 4, PHICH in 0, ret in 4 next frame
      *frame=(current_frame+1) & 1023;
    } else if (cc->tdd_Config->subframeAssignment == 4) {
        // original PUSCH in 2, PHICH in 8, ret in 2 next frame
        // original PUSCH in 3, PHICH in 9, ret in 3 next frame
        *frame=(current_frame+1) & 1023;
    } else if (cc->tdd_Config->subframeAssignment == 5) {
        // original PUSCH in 2, PHICH in 8, ret in 2 next frame
        *frame=(current_frame+1) & 1023;
    }
  }
}

uint8_t subframe2harqpid(COMMON_channels_t *cc,uint32_t frame,uint8_t subframe)
{
  uint8_t ret = 255;

  AssertFatal(cc!=NULL,"cc is null\n");

  if (cc->tdd_Config == NULL) { // FDD
    ret = (((frame<<1)+subframe)&7);
  } else {

    switch (cc->tdd_Config->subframeAssignment) {

    case 1:
      if ((subframe==2) ||
          (subframe==3) ||
          (subframe==7) ||
          (subframe==8))
        switch (subframe) {
        case 2:
        case 3:
          ret = (subframe-2);
          break;

        case 7:
        case 8:
          ret = (subframe-5);
          break;

        default:
	  AssertFatal(1==0,"subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframe,(int)cc->tdd_Config->subframeAssignment);
          break;
        }

      break;

    case 2:
      AssertFatal((subframe==2) || (subframe==7),
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframe,(int)cc->tdd_Config->subframeAssignment);
       
      ret = (subframe/7);
      break;

    case 3:
      AssertFatal((subframe>1) && (subframe<5), 
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframe,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframe-2);
      break;

    case 4:
      AssertFatal((subframe>1) && (subframe<4),
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframe,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframe-2);
      break;

    case 5:
      AssertFatal(subframe==2,
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframe,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframe-2);
      break;

    default:
      AssertFatal(1==0,"subframe2_harq_pid, Unsupported TDD mode %d\n",(int)cc->tdd_Config->subframeAssignment);
    }
  }
  return ret;
}

uint8_t get_Msg3harqpid(COMMON_channels_t *cc,
			uint32_t frame,
			unsigned char current_subframe)
{

  uint8_t ul_subframe=0;
  uint32_t ul_frame=0;

  if (cc->tdd_Config == NULL) { // FDD
    ul_subframe = (current_subframe>3) ? (current_subframe-4) : (current_subframe+6);
    ul_frame    = (current_subframe>3) ? ((frame+1)&1023) : frame;
  } else {
    switch (cc->tdd_Config->subframeAssignment) {
    case 1:
      switch (current_subframe) {

      case 9:
      case 0:
        ul_subframe = 7;
        break;

      case 5:
      case 7:
        ul_subframe = 2;
        break;

      }

      break;

    case 3:
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
        ul_subframe = 2;
        break;

      case 7:
        ul_subframe = 3;
        break;

      case 8:
        ul_subframe = 4;
        break;

      case 9:
        ul_subframe = 2;
        break;
      }

      break;

    case 4:
      switch (current_subframe) {

      case 0:
      case 5:
      case 6:
      case 8:
      case 9:
        ul_subframe = 2;
        break;

      case 7:
        ul_subframe = 3;
        break;
      }

      break;

    case 5:
      ul_subframe =2;
      break;

    default:
      LOG_E(PHY,"get_Msg3_harq_pid: Unsupported TDD configuration %d\n",(int)cc->tdd_Config->subframeAssignment);
      AssertFatal(1==0,"get_Msg3_harq_pid: Unsupported TDD configuration");
      break;
    }
  }

  return(subframe2harqpid(cc,ul_frame,ul_subframe));

}

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//------------------------------------------------------------------------------
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void init_ue_sched_info(void)
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//------------------------------------------------------------------------------
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{
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  module_id_t i,j,k;
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  for (i=0; i<NUMBER_OF_eNB_MAX; i++) {
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    for (k=0; k<MAX_NUM_CCs; k++) {
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      for (j=0; j<NUMBER_OF_UE_MAX; j++) {
        // init DL
        eNB_dlsch_info[i][k][j].weight           = 0;
        eNB_dlsch_info[i][k][j].subframe         = 0;
        eNB_dlsch_info[i][k][j].serving_num      = 0;
        eNB_dlsch_info[i][k][j].status           = S_DL_NONE;
        // init UL
        eNB_ulsch_info[i][k][j].subframe         = 0;
        eNB_ulsch_info[i][k][j].serving_num      = 0;
        eNB_ulsch_info[i][k][j].status           = S_UL_NONE;
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      }
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    }
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  }
}



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//------------------------------------------------------------------------------
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unsigned char get_ue_weight(module_id_t module_idP, int CC_idP, int ue_idP)
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//------------------------------------------------------------------------------
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{
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  return(eNB_dlsch_info[module_idP][CC_idP][ue_idP].weight);
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}

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//------------------------------------------------------------------------------
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int find_UE_id(module_id_t mod_idP, rnti_t rntiP)
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//------------------------------------------------------------------------------
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{
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  int UE_id;
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  UE_list_t *UE_list = &RC.mac[mod_idP]->UE_list;
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  for (UE_id = 0; UE_id < NUMBER_OF_UE_MAX; UE_id++) {
    if (UE_list->active[UE_id] != TRUE) continue;
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    if (UE_list->UE_template[UE_PCCID(mod_idP,UE_id)][UE_id].rnti==rntiP) {
      return(UE_id);
    }
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  }
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  return(-1);
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}

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//------------------------------------------------------------------------------
int find_RA_id(module_id_t mod_idP, int CC_idP, rnti_t rntiP)
//------------------------------------------------------------------------------
{
  int RA_id;
  AssertFatal(RC.mac[mod_idP],"RC.mac[%d] is null\n",mod_idP);
  
  RA_TEMPLATE *RA_template = (RA_TEMPLATE *)&RC.mac[mod_idP]->common_channels[CC_idP].RA_template[0];

 

  for (RA_id = 0; RA_id < NB_RA_PROC_MAX; RA_id++)
    if (RA_template[RA_id].RA_active==TRUE && 
        RA_template[RA_id].wait_ack_Msg4 == 0 &&
	RA_template[RA_id].rnti == rntiP) return(RA_id);
  return(-1);
}

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//------------------------------------------------------------------------------
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int UE_num_active_CC(UE_list_t *listP,int ue_idP)
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//------------------------------------------------------------------------------
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{
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  return(listP->numactiveCCs[ue_idP]);
}
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//------------------------------------------------------------------------------
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int UE_PCCID(module_id_t mod_idP,int ue_idP)
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//------------------------------------------------------------------------------
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{
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  return(RC.mac[mod_idP]->UE_list.pCC_id[ue_idP]);
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}
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//------------------------------------------------------------------------------
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rnti_t UE_RNTI(module_id_t mod_idP, int ue_idP)
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//------------------------------------------------------------------------------
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{
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  rnti_t rnti = RC.mac[mod_idP]->UE_list.UE_template[UE_PCCID(mod_idP,ue_idP)][ue_idP].rnti;
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  if (rnti>0) {
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    return (rnti);
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  }
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  LOG_D(MAC,"[eNB %d] Couldn't find RNTI for UE %d\n",mod_idP,ue_idP);
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  //display_backtrace();
  return(NOT_A_RNTI);
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}
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//------------------------------------------------------------------------------
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boolean_t is_UE_active(module_id_t mod_idP, int ue_idP)
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//------------------------------------------------------------------------------
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{
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  return(RC.mac[mod_idP]->UE_list.active[ue_idP]);
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}
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/*
uint8_t find_active_UEs(module_id_t module_idP,int CC_id){
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  module_id_t        ue_mod_id      = 0;
  rnti_t        rnti         = 0;
  uint8_t            nb_active_ue = 0;

  for (ue_mod_id=0;ue_mod_id<NUMBER_OF_UE_MAX;ue_mod_id++) {

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      if (((rnti=eNB_mac_inst[module_idP][CC_id].UE_template[ue_mod_id].rnti) !=0)&&(eNB_mac_inst[module_idP][CC_id].UE_template[ue_mod_id].ul_active==TRUE)){
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          if (mac_xface->get_eNB_UE_stats(module_idP,rnti) != NULL){ // check at the phy enb_ue state for this rnti
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      nb_active_ue++;
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          }
          else { // this ue is removed at the phy => remove it at the mac as well
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      mac_remove_ue(module_idP, CC_id, ue_mod_id);
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          }
      }
  }
  return(nb_active_ue);
}
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*/
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// get aggregation (L) form phy for a give UE
unsigned char get_aggregation (uint8_t bw_index, uint8_t cqi, uint8_t dci_fmt)
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{
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  unsigned char aggregation=3;
  
  switch (dci_fmt){
    
  case format0:
    aggregation = cqi2fmt0_agg[bw_index][cqi];
    break;
  case format1:
  case format1A:
  case format1B:
  case format1D:
    aggregation = cqi2fmt1x_agg[bw_index][cqi]; 
    break;
  case format2:
  case format2A:
  case format2B:
  case format2C:
  case format2D:
    aggregation = cqi2fmt2x_agg[bw_index][cqi]; 
    break;
  case format1C:
  case format1E_2A_M10PRB:
  case format3:
  case format3A:
  case format4:
  default:
    LOG_W(MAC,"unsupported DCI format %d\n",dci_fmt);
  }

   LOG_D(MAC,"Aggregation level %d (cqi %d, bw_index %d, format %d)\n", 
   	1<<aggregation, cqi,bw_index,dci_fmt);
   
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  return 1<<aggregation;
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}
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void dump_ue_list(UE_list_t *listP, int ul_flag)
{
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  int j;
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  if ( ul_flag == 0 ) {
    for (j=listP->head; j>=0; j=listP->next[j]) {
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      LOG_T(MAC,"node %d => %d\n",j,listP->next[j]);
    }
  } else {
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    for (j=listP->head_ul; j>=0; j=listP->next_ul[j]) {
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      LOG_T(MAC,"node %d => %d\n",j,listP->next_ul[j]);
    }
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  }
}

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int add_new_ue(module_id_t mod_idP, int cc_idP, rnti_t rntiP,int harq_pidP)
{
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  int UE_id;
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  int i, j;
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  UE_list_t *UE_list = &RC.mac[mod_idP]->UE_list;
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  LOG_D(MAC,"[eNB %d, CC_id %d] Adding UE with rnti %x (next avail %d, num_UEs %d)\n",mod_idP,cc_idP,rntiP,UE_list->avail,UE_list->num_UEs);
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  dump_ue_list(UE_list,0);
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  for (i = 0; i < NUMBER_OF_UE_MAX; i++) {
    if (UE_list->active[i] == TRUE) continue;
    UE_id = i;
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    UE_list->UE_template[cc_idP][UE_id].rnti       = rntiP;
    UE_list->UE_template[cc_idP][UE_id].configured = FALSE;
    UE_list->numactiveCCs[UE_id]                   = 1;
    UE_list->numactiveULCCs[UE_id]                 = 1;
    UE_list->pCC_id[UE_id]                         = cc_idP;
    UE_list->ordered_CCids[0][UE_id]               = cc_idP;
    UE_list->ordered_ULCCids[0][UE_id]             = cc_idP;
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    UE_list->num_UEs++;
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    UE_list->active[UE_id]                         = TRUE;
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    memset((void*)&UE_list->UE_sched_ctrl[UE_id],0,sizeof(UE_sched_ctrl));
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    memset((void*)&UE_list->eNB_UE_stats[cc_idP][UE_id],0,sizeof(eNB_UE_STATS));
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    for (j=0; j<8; j++) {
      UE_list->UE_template[cc_idP][UE_id].oldNDI[j]    = (j==0)?1:0;   // 1 because first transmission is with format1A (Msg4) for harq_pid 0
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      UE_list->UE_template[cc_idP][UE_id].oldNDI_UL[j] = (j==harq_pidP)?0:1; // 1st transmission is with Msg3;
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    }
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    eNB_ulsch_info[mod_idP][cc_idP][UE_id].status = S_UL_WAITING;
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    eNB_dlsch_info[mod_idP][cc_idP][UE_id].status = S_DL_WAITING;
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    LOG_D(MAC,"[eNB %d] Add UE_id %d on Primary CC_id %d: rnti %x\n",mod_idP,UE_id,cc_idP,rntiP);
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    dump_ue_list(UE_list,0);
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    return(UE_id);
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  }
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  printf("MAC: cannot add new UE for rnti %x\n", rntiP);
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  LOG_E(MAC,"error in add_new_ue(), could not find space in UE_list, Dumping UE list\n");
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  dump_ue_list(UE_list,0);
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  return(-1);
}

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//------------------------------------------------------------------------------
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int rrc_mac_remove_ue(module_id_t mod_idP,rnti_t rntiP) 
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//------------------------------------------------------------------------------
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{
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  int i;
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  UE_list_t *UE_list = &RC.mac[mod_idP]->UE_list;
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  int UE_id = find_UE_id(mod_idP,rntiP);
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  int pCC_id;
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  if (UE_id == -1) {
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printf("MAC: cannot remove UE rnti %x\n", rntiP);
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    LOG_W(MAC,"rrc_mac_remove_ue: UE %x not found\n", rntiP);
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    mac_phy_remove_ue(mod_idP, rntiP);
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    return 0;
  }

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  pCC_id = UE_PCCID(mod_idP,UE_id);

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  LOG_I(MAC,"Removing UE %d from Primary CC_id %d (rnti %x)\n",UE_id,pCC_id, rntiP);
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  dump_ue_list(UE_list,0);
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  UE_list->active[UE_id] = FALSE;
  UE_list->num_UEs--;

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  // clear all remaining pending transmissions
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  UE_list->UE_template[pCC_id][UE_id].bsr_info[LCGID0]  = 0;
  UE_list->UE_template[pCC_id][UE_id].bsr_info[LCGID1]  = 0;
  UE_list->UE_template[pCC_id][UE_id].bsr_info[LCGID2]  = 0;
  UE_list->UE_template[pCC_id][UE_id].bsr_info[LCGID3]  = 0;

  UE_list->UE_template[pCC_id][UE_id].ul_SR             = 0;
  UE_list->UE_template[pCC_id][UE_id].rnti              = NOT_A_RNTI;
  UE_list->UE_template[pCC_id][UE_id].ul_active         = FALSE;
  eNB_ulsch_info[mod_idP][pCC_id][UE_id].rnti                        = NOT_A_RNTI;
  eNB_ulsch_info[mod_idP][pCC_id][UE_id].status                      = S_UL_NONE;
  eNB_dlsch_info[mod_idP][pCC_id][UE_id].rnti                        = NOT_A_RNTI;
  eNB_dlsch_info[mod_idP][pCC_id][UE_id].status                      = S_DL_NONE;
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  mac_phy_remove_ue(mod_idP,rntiP);

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  // check if this has an RA process active
  RA_TEMPLATE *RA_template;
  for (i=0;i<NB_RA_PROC_MAX;i++) {
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    RA_template = (RA_TEMPLATE *)&RC.mac[mod_idP]->common_channels[pCC_id].RA_template[i];
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    if (RA_template->rnti == rntiP){
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      RA_template->RA_active=FALSE;
      RA_template->generate_rar=0;
      RA_template->generate_Msg4=0;
      RA_template->wait_ack_Msg4=0;
      RA_template->timing_offset=0;
      RA_template->RRC_timer=20;
      RA_template->rnti = 0;
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      //break;
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    }
  }
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  return 0;
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}


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int prev(UE_list_t *listP, int nodeP, int ul_flag)
{
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  int j;
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  if (ul_flag == 0 ) {
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    if (nodeP==listP->head) {
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      return(nodeP);
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    }
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    for (j=listP->head; j>=0; j=listP->next[j]) {
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      if (listP->next[j]==nodeP) {
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        return(j);
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    }
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    }
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  } else {
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    if (nodeP==listP->head_ul) {
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      return(nodeP);
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    }
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    for (j=listP->head_ul; j>=0; j=listP->next_ul[j]) {
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      if (listP->next_ul[j]==nodeP) {
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        return(j);
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      }
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    }
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  }
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  LOG_E(MAC,"error in prev(), could not find previous to %d in UE_list %s, should never happen, Dumping UE list\n",
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        nodeP, (ul_flag == 0)? "DL" : "UL");
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  dump_ue_list(listP, ul_flag);
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  return(-1);
}
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void swap_UEs(UE_list_t *listP,int nodeiP, int nodejP, int ul_flag)
{
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  int prev_i,prev_j,next_i,next_j;

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  LOG_T(MAC,"Swapping UE %d,%d\n",nodeiP,nodejP);
  dump_ue_list(listP,ul_flag);
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  prev_i = prev(listP,nodeiP,ul_flag);
  prev_j = prev(listP,nodejP,ul_flag);
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  AssertFatal((prev_i>=0) && (prev_j>=0),
	      "swap_UEs: problem");
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  if (ul_flag == 0) {
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    next_i = listP->next[nodeiP];
    next_j = listP->next[nodejP];
  } else {
    next_i = listP->next_ul[nodeiP];
    next_j = listP->next_ul[nodejP];
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  }
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  LOG_T(MAC,"[%s] next_i %d, next_i, next_j %d, head %d \n",
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        (ul_flag == 0)? "DL" : "UL",
        next_i,next_j,listP->head);
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  if (ul_flag == 0 ) {
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    if (next_i == nodejP) {   // case ... p(i) i j n(j) ... => ... p(j) j i n(i) ...
      LOG_T(MAC,"Case ... p(i) i j n(j) ... => ... p(j) j i n(i) ...\n");
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      listP->next[nodeiP] = next_j;
      listP->next[nodejP] = nodeiP;
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      if (nodeiP==listP->head) { // case i j n(j)
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        listP->head = nodejP;
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      } else {
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        listP->next[prev_i] = nodejP;
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      }
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    } else if (next_j == nodeiP) {  // case ... p(j) j i n(i) ... => ... p(i) i j n(j) ...
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      LOG_T(MAC,"Case ... p(j) j i n(i) ... => ... p(i) i j n(j) ...\n");
      listP->next[nodejP] = next_i;
      listP->next[nodeiP] = nodejP;
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      if (nodejP==listP->head) { // case j i n(i)
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        listP->head = nodeiP;
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      } else {
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        listP->next[prev_j] = nodeiP;
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      }
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    } else {  // case ...  p(i) i n(i) ... p(j) j n(j) ...
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      listP->next[nodejP] = next_i;
      listP->next[nodeiP] = next_j;
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      if (nodeiP==listP->head) {
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        LOG_T(MAC,"changing head to %d\n",nodejP);
        listP->head=nodejP;
        listP->next[prev_j] = nodeiP;
      } else if (nodejP==listP->head) {
        LOG_D(MAC,"changing head to %d\n",nodeiP);
        listP->head=nodeiP;
        listP->next[prev_i] = nodejP;
      } else {
        listP->next[prev_i] = nodejP;
        listP->next[prev_j] = nodeiP;
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      }
    }
  } else { // ul_flag

    if (next_i == nodejP) {   // case ... p(i) i j n(j) ... => ... p(j) j i n(i) ...
      LOG_T(MAC,"[UL] Case ... p(i) i j n(j) ... => ... p(j) j i n(i) ...\n");
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      listP->next_ul[nodeiP] = next_j;
      listP->next_ul[nodejP] = nodeiP;
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      if (nodeiP==listP->head_ul) { // case i j n(j)
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        listP->head_ul = nodejP;
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      } else {
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        listP->next_ul[prev_i] = nodejP;
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      }
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    } else if (next_j == nodeiP) {  // case ... p(j) j i n(i) ... => ... p(i) i j n(j) ...
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      LOG_T(MAC,"[UL]Case ... p(j) j i n(i) ... => ... p(i) i j n(j) ...\n");
      listP->next_ul[nodejP] = next_i;
      listP->next_ul[nodeiP] = nodejP;
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      if (nodejP==listP->head_ul) { // case j i n(i)
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        listP->next_ul[prev_j] = nodeiP;
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      }
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    } else {  // case ...  p(i) i n(i) ... p(j) j n(j) ...

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      listP->next_ul[nodejP] = next_i;
      listP->next_ul[nodeiP] = next_j;
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      if (nodeiP==listP->head_ul) {
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        LOG_T(MAC,"[UL]changing head to %d\n",nodejP);
        listP->head_ul=nodejP;
        listP->next_ul[prev_j] = nodeiP;
      } else if (nodejP==listP->head_ul) {
        LOG_T(MAC,"[UL]changing head to %d\n",nodeiP);
        listP->head_ul=nodeiP;
        listP->next_ul[prev_i] = nodejP;
      } else {
        listP->next_ul[prev_i] = nodejP;
        listP->next_ul[prev_j] = nodeiP;
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      }
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    }
  }
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  LOG_T(MAC,"After swap\n");
  dump_ue_list(listP,ul_flag);
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}



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/*
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  #if defined(Rel10) || defined(Rel14)
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  unsigned char generate_mch_header( unsigned char *mac_header,
  unsigned char num_sdus,
  unsigned short *sdu_lengths,
  unsigned char *sdu_lcids,
  unsigned char msi,
  unsigned char short_padding,
  unsigned short post_padding) {

  SCH_SUBHEADER_FIXED *mac_header_ptr = (SCH_SUBHEADER_FIXED *)mac_header;
  uint8_t first_element=0,last_size=0,i;
  uint8_t mac_header_control_elements[2*num_sdus],*ce_ptr;

  ce_ptr = &mac_header_control_elements[0];

  if ((short_padding == 1) || (short_padding == 2)) {
  mac_header_ptr->R    = 0;
  mac_header_ptr->E    = 0;
  mac_header_ptr->LCID = SHORT_PADDING;
  first_element=1;
  last_size=1;
  }
  if (short_padding == 2) {
  mac_header_ptr->E = 1;
  mac_header_ptr++;
  mac_header_ptr->R = 0;
  mac_header_ptr->E    = 0;
  mac_header_ptr->LCID = SHORT_PADDING;
  last_size=1;
  }

  // SUBHEADER for MSI CE
  if (msi != 0) {// there is MSI MAC Control Element
  if (first_element>0) {
  mac_header_ptr->E = 1;
  mac_header_ptr+=last_size;
  }
  else {
  first_element = 1;
  }
  if (num_sdus*2 < 128) {
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->E    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->LCID = MCH_SCHDL_INFO;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L    = num_sdus*2;
  last_size=2;
  }
  else {
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->R    = 0;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->E    = 0;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F    = 1;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->LCID = MCH_SCHDL_INFO;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L    = (num_sdus*2)&0x7fff;
  last_size=3;
  }
  // Create the MSI MAC Control Element here
  }

  // SUBHEADER for MAC SDU (MCCH+MTCHs)
  for (i=0;i<num_sdus;i++) {
  if (first_element>0) {
  mac_header_ptr->E = 1;
  mac_header_ptr+=last_size;
  }
  else {
  first_element = 1;
  }
  if (sdu_lengths[i] < 128) {
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->R    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->E    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->F    = 0;
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->LCID = sdu_lcids[i];
  ((SCH_SUBHEADER_SHORT *)mac_header_ptr)->L    = (unsigned char)sdu_lengths[i];
  last_size=2;
  }
  else {
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->R    = 0;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->E    = 0;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->F    = 1;
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->LCID = sdu_lcids[i];
  ((SCH_SUBHEADER_LONG *)mac_header_ptr)->L    = (unsigned short) sdu_lengths[i]&0x7fff;
  last_size=3;
  }
  }

  if (post_padding>0) {// we have lots of padding at the end of the packet
  mac_header_ptr->E = 1;
  mac_header_ptr+=last_size;
  // add a padding element
  mac_header_ptr->R    = 0;
  mac_header_ptr->E    = 0;
  mac_header_ptr->LCID = SHORT_PADDING;
  mac_header_ptr++;
  }
  else { // no end of packet padding
  // last SDU subhead is of fixed type (sdu length implicitly to be computed at UE)
  mac_header_ptr++;
  }

  // Copy MSI Control Element to the end of the MAC Header if it presents
  if ((ce_ptr-mac_header_control_elements) > 0) {
  // printf("Copying %d bytes for control elements\n",ce_ptr-mac_header_control_elements);
  memcpy((void*)mac_header_ptr,mac_header_control_elements,ce_ptr-mac_header_control_elements);
  mac_header_ptr+=(unsigned char)(ce_ptr-mac_header_control_elements);
  }

  return((unsigned char*)mac_header_ptr - mac_header);
  }
  #endif
 */



// This has to be updated to include BSR information
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uint8_t UE_is_to_be_scheduled(module_id_t module_idP,int CC_id,uint8_t UE_id)
{
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  UE_TEMPLATE *UE_template    = &RC.mac[module_idP]->UE_list.UE_template[CC_id][UE_id];
  UE_sched_ctrl *UE_sched_ctl = &RC.mac[module_idP]->UE_list.UE_sched_ctrl[UE_id];
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  // do not schedule UE if UL is not working
  if (UE_sched_ctl->ul_failure_timer>0)
    return(0);
  if (UE_sched_ctl->ul_out_of_sync>0)
    return(0);

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  LOG_D(MAC,"[eNB %d][PUSCH] Checking UL requirements UE %d/%x\n",module_idP,UE_id,UE_RNTI(module_idP,UE_id));

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  if ((UE_template->bsr_info[LCGID0]>0) ||
      (UE_template->bsr_info[LCGID1]>0) ||
      (UE_template->bsr_info[LCGID2]>0) ||
      (UE_template->bsr_info[LCGID3]>0) ||
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      (UE_template->ul_SR>0) || // uplink scheduling request
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      ((UE_sched_ctl->ul_inactivity_timer>20)&&
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       (UE_sched_ctl->ul_scheduled==0))||  // every 2 frames when RRC_CONNECTED
      ((UE_sched_ctl->ul_inactivity_timer>10)&&
       (UE_sched_ctl->ul_scheduled==0)&&
       (mac_eNB_get_rrc_status(module_idP,UE_RNTI(module_idP,UE_id)) < RRC_CONNECTED))) // every Frame when not RRC_CONNECTED
    { 
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    LOG_D(MAC,"[eNB %d][PUSCH] UE %d/%x should be scheduled\n",module_idP,UE_id,UE_RNTI(module_idP,UE_id));
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    return(1);
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  } else {
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    return(0);
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  }
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}


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uint8_t get_tmode(module_id_t module_idP,int CC_idP,int UE_idP) {

  eNB_MAC_INST         *eNB                                = RC.mac[module_idP];
  COMMON_channels_t    *cc                                 = &eNB->common_channels[CC_idP];

  struct PhysicalConfigDedicated  *physicalConfigDedicated = eNB->UE_list.physicalConfigDedicated[CC_idP][UE_idP];

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  if (physicalConfigDedicated == NULL ) { // RRCConnectionSetup not received by UE yet
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    AssertFatal(cc->p_eNB<=2,"p_eNB is %d, should be <2\n",cc->p_eNB);
    return(cc->p_eNB);
  }
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  else {
    AssertFatal(physicalConfigDedicated->antennaInfo!=NULL,
		"antennaInfo is null for CCId %d, UEid %d\n",CC_idP,UE_idP);
    
    AssertFatal(physicalConfigDedicated->antennaInfo->present != PhysicalConfigDedicated__antennaInfo_PR_NOTHING, 
		"antennaInfo (mod_id %d, CC_id %d) is set to NOTHING\n",module_idP,CC_idP);
    
    if (physicalConfigDedicated->antennaInfo->present == PhysicalConfigDedicated__antennaInfo_PR_explicitValue) {
      return(physicalConfigDedicated->antennaInfo->choice.explicitValue.transmissionMode);
    }
    else if (physicalConfigDedicated->antennaInfo->present == PhysicalConfigDedicated__antennaInfo_PR_defaultValue) {
      AssertFatal(cc->p_eNB<=2,"p_eNB is %d, should be <2\n",cc->p_eNB);
      return(cc->p_eNB);
    }
    else AssertFatal(1==0,"Shouldn't be here\n");
  }
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}

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int8_t get_ULharq(module_id_t module_idP,int CC_idP,uint16_t frameP,uint8_t subframeP) {
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  uint8_t           ret       = -1;
  eNB_MAC_INST      *eNB      = RC.mac[module_idP];
  COMMON_channels_t *cc       = &eNB->common_channels[CC_idP];

  if (cc->tdd_Config==NULL) { // FDD
    ret = (((frameP<<1)+subframeP)&7);
  } else {

    switch (cc->tdd_Config->subframeAssignment) {

    case 1:
      if ((subframeP==2) ||
          (subframeP==3) ||
          (subframeP==7) ||
          (subframeP==8))
        switch (subframeP) {
        case 2:
        case 3:
          ret = (subframeP-2);
          break;

        case 7:
        case 8:
          ret = (subframeP-5);
          break;

        default:
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          AssertFatal(1==0,"subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframeP,(int)cc->tdd_Config->subframeAssignment);
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          break;
        }

      break;

    case 2:
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      AssertFatal((subframeP==2) || (subframeP==7),
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframeP,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframeP/7);
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      break;

    case 3:
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      AssertFatal((subframeP>1) && (subframeP<5),
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframeP,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframeP-2);
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      break;

    case 4:
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      AssertFatal((subframeP>1) && (subframeP<4),
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframeP,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframeP-2);
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      break;

    case 5:
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      AssertFatal(subframeP==2,
		  "subframe2_harq_pid, Illegal subframe %d for TDD mode %d\n",subframeP,(int)cc->tdd_Config->subframeAssignment);
      ret = (subframeP-2);
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      break;

    default:
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      AssertFatal(1==0,"subframe2_harq_pid, Unsupported TDD mode %d\n",(int)cc->tdd_Config->subframeAssignment);
      break;
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    }
  }

  AssertFatal(ret!=-1,
	      "invalid harq_pid(%d) at SFN/SF = %d/%d\n", (int8_t)ret, frameP, subframeP);
  return ret;
}


uint16_t getRIV(uint16_t N_RB_DL,uint16_t RBstart,uint16_t Lcrbs)
{

  uint16_t RIV;

  if (Lcrbs<=(1+(N_RB_DL>>1)))
    RIV = (N_RB_DL*(Lcrbs-1)) + RBstart;
  else
    RIV = (N_RB_DL*(N_RB_DL+1-Lcrbs)) + (N_RB_DL-1-RBstart);
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  return(RIV);
}
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uint32_t allocate_prbs(int UE_id,unsigned char nb_rb, int N_RB_DL, uint32_t *rballoc)
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{
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  int i;
  uint32_t rballoc_dci=0;
  unsigned char nb_rb_alloc=0;

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  for (i=0; i<(N_RB_DL-2); i+=2) {
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    if (((*rballoc>>i)&3)==0) {
      *rballoc |= (3<<i);
      rballoc_dci |= (1<<((12-i)>>1));
      nb_rb_alloc+=2;
    }

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    if (nb_rb_alloc==nb_rb) {
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      return(rballoc_dci);
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    }
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  }

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  if ((N_RB_DL&1)==1) {
    if ((*rballoc>>(N_RB_DL-1)&1)==0) {
      *rballoc |= (1<<(N_RB_DL-1));
      rballoc_dci |= 1;
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    }
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  }
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  return(rballoc_dci);
}

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int get_bw_index(module_id_t module_id, uint8_t CC_id)
{

  int bw_index=0;
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  int N_RB_DL = to_prb(RC.mac[module_id]->common_channels[CC_id].mib->message.dl_Bandwidth);
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  switch (N_RB_DL) {
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  case 6: // 1.4 MHz
    bw_index=0;
    break;

  case 25: // 5HMz
    bw_index=1;
    break;

  case 50: // 10HMz
    bw_index=2;
    break;

  case 100: // 20HMz
    bw_index=3;
    break;

  default:
    bw_index=1;
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    LOG_W(MAC,"[eNB %d] N_RB_DL %d unknown for CC_id %d, setting bw_index to 1\n", module_id, N_RB_DL,CC_id);
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    break;
  }

  return bw_index;
}

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int get_min_rb_unit(module_id_t module_id, uint8_t CC_id)
{

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  int min_rb_unit=0;
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  int N_RB_DL = to_prb(RC.mac[module_id]->common_channels[CC_id].mib->message.dl_Bandwidth);
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  switch (N_RB_DL) {
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  case 6: // 1.4 MHz
    min_rb_unit=1;
    break;
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  case 25: // 5HMz
    min_rb_unit=2;
    break;
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  case 50: // 10HMz
    min_rb_unit=3;
    break;
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  case 100: // 20HMz
    min_rb_unit=4;
    break;
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  default:
    min_rb_unit=2;
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    LOG_W(MAC,"[eNB %d] N_DL_RB %d unknown for CC_id %d, setting min_rb_unit to 2\n",
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          module_id, N_RB_DL, CC_id);
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    break;
  }
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  return min_rb_unit;
}
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uint32_t allocate_prbs_sub(int nb_rb, int N_RB_DL, int N_RBG, uint8_t *rballoc)
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{
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  int check=0;//check1=0,check2=0;
  uint32_t rballoc_dci=0;
  //uint8_t number_of_subbands=13;

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  LOG_T(MAC,"*****Check1RBALLOC****: %d%d%d%d (nb_rb %d,N_RBG %d)\n",
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        rballoc[3],rballoc[2],rballoc[1],rballoc[0],nb_rb,N_RBG);
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  while((nb_rb >0) && (check < N_RBG)) {
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    //printf("rballoc[%d] %d\n",check,rballoc[check]);
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    if(rballoc[check] == 1) {
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      rballoc_dci |= (1<<((N_RBG-1)-check));
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      switch (N_RB_DL) {
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      case 6:
        nb_rb--;
        break;

      case 25:
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        if ((check == N_RBG-1)) {
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          nb_rb--;
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        } else {
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          nb_rb-=2;
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        }
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        break;

      case 50:
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        if ((check == N_RBG-1)) {
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          nb_rb-=2;
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        } else {
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          nb_rb-=3;
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        }
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        break;

      case 100:
        nb_rb-=4;
        break;
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      }
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    }

    //      printf("rb_alloc %x\n",rballoc_dci);
    check = check+1;
    //    check1 = check1+2;
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  }
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  // rballoc_dci = (rballoc_dci)&(0x1fff);
  LOG_T(MAC,"*********RBALLOC : %x\n",rballoc_dci);
  // exit(-1);
  return (rballoc_dci);
}

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int get_subbandsize(uint8_t dl_Bandwidth) {
  uint8_t ss[6] = {6,4,4,6,8,8};

  AssertFatal(dl_Bandwidth<6,"dl_Bandwidth %d is out of bounds\n",dl_Bandwidth);
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  return(ss[dl_Bandwidth]);
}
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int get_nb_subband(int N_RB_DL)
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{

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  int nb_sb=0;

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  switch (N_RB_DL) {
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  case 6:
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    nb_sb=0;
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    break;
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