eNB_scheduler.c

/*******************************************************************************
    OpenAirInterface
    Copyright(c) 1999 - 2014 Eurecom

    OpenAirInterface is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.


    OpenAirInterface is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with OpenAirInterface.The full GNU General Public License is
    included in this distribution in the file called "COPYING". If not,
    see <http://www.gnu.org/licenses/>.

  Contact Information
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  Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE

*******************************************************************************/
/*! \file eNB_scheduler.c
 * \brief eNB scheduler top level function operates on per subframe basis
 * \author  Navid Nikaein and Raymond Knopp
 * \date 2010 - 2014
 * \email: navid.nikaein@eurecom.fr
 * \version 0.5
 * @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
//#define DEBUG_HEADER_PARSING 1
//#define DEBUG_PACKET_TRACE 1

/*
  #ifndef USER_MODE
  #define msg debug_msg
  #endif
 */




void eNB_dlsch_ulsch_scheduler(module_id_t module_idP,uint8_t cooperation_flag, frame_t frameP, sub_frame_t subframeP) {//, int calibration_flag) {

  unsigned int nprb[MAX_NUM_CCs];
  unsigned int nCCE[MAX_NUM_CCs];
  int mbsfn_status[MAX_NUM_CCs];
  uint32_t RBalloc[MAX_NUM_CCs];
  protocol_ctxt_t   ctxt;
#ifdef EXMIMO
  int ret;
#endif
#if defined(ENABLE_ITTI)
  MessageDef   *msg_p;
  const char   *msg_name;
  instance_t    instance;
  int           result;
#endif
  DCI_PDU *DCI_pdu[MAX_NUM_CCs];
  int CC_id,i,next_i;
  UE_list_t *UE_list=&eNB_mac_inst[module_idP].UE_list;

  //  LOG_I(MAC,"[eNB %d] Frame %d, Subframe %d, entering MAC scheduler (UE_list->head %d)\n",module_idP, frameP, subframeP,UE_list->head);

  start_meas(&eNB_mac_inst[module_idP].eNB_scheduler);
  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_ULSCH_SCHEDULER,VCD_FUNCTION_IN);

  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
    DCI_pdu[CC_id] = &eNB_mac_inst[module_idP].common_channels[CC_id].DCI_pdu;
    nCCE[CC_id]=0;
    nprb[CC_id]=0;
    RBalloc[CC_id]=0;
    mbsfn_status[CC_id]=0;
  }
  // refresh UE list based on UEs dropped by PHY in previous subframe
  for (i=UE_list->head;i>0;i=UE_list->next[i]) {
    LOG_T(MAC,"UE %d: rnti %x (%p)\n",i,UE_RNTI(module_idP,i),mac_xface->get_eNB_UE_stats(module_idP,0,UE_RNTI(module_idP,i)));
    if (mac_xface->get_eNB_UE_stats(module_idP,0,UE_RNTI(module_idP,i))==NULL)
      mac_remove_ue(module_idP,i,frameP);
  }
#if defined(ENABLE_ITTI)
  do {
      // Checks if a message has been sent to MAC sub-task
      itti_poll_msg (TASK_MAC_ENB, &msg_p);

      if (msg_p != NULL) {
          msg_name = ITTI_MSG_NAME (msg_p);
          instance = ITTI_MSG_INSTANCE (msg_p);

          switch (ITTI_MSG_ID(msg_p)) {
          case MESSAGE_TEST:
            LOG_D(MAC, "Received %s\n", ITTI_MSG_NAME(msg_p));
            break;

          case RRC_MAC_BCCH_DATA_REQ:
            LOG_D(MAC, "Received %s from %s: instance %d, frameP %d, eNB_index %d\n",
                msg_name, ITTI_MSG_ORIGIN_NAME(msg_p), instance,
                RRC_MAC_BCCH_DATA_REQ (msg_p).frame, RRC_MAC_BCCH_DATA_REQ (msg_p).enb_index);

            // TODO process BCCH data req.
            break;

          case RRC_MAC_CCCH_DATA_REQ:
            LOG_D(MAC, "Received %s from %s: instance %d, frameP %d, eNB_index %d\n",
                msg_name, ITTI_MSG_ORIGIN_NAME(msg_p), instance,
                RRC_MAC_CCCH_DATA_REQ (msg_p).frame, RRC_MAC_CCCH_DATA_REQ (msg_p).enb_index);

            // TODO process CCCH data req.
            break;

#ifdef Rel10
          case RRC_MAC_MCCH_DATA_REQ:
            LOG_D(MAC, "Received %s from %s: instance %d, frameP %d, eNB_index %d, mbsfn_sync_area %d\n",
                msg_name, ITTI_MSG_ORIGIN_NAME(msg_p), instance,
                RRC_MAC_MCCH_DATA_REQ (msg_p).frame, RRC_MAC_MCCH_DATA_REQ (msg_p).enb_index, RRC_MAC_MCCH_DATA_REQ (msg_p).mbsfn_sync_area);

            // TODO process MCCH data req.
            break;
#endif

          default:
            LOG_E(MAC, "Received unexpected message %s\n", msg_name);
            break;
          }

          result = itti_free (ITTI_MSG_ORIGIN_ID(msg_p), msg_p);
          AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
      }
  } while(msg_p != NULL);
#endif

  // clear DCI and BCCH contents before scheduling
  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
    DCI_pdu[CC_id]->Num_common_dci  = 0;
    DCI_pdu[CC_id]->Num_ue_spec_dci = 0;
    eNB_mac_inst[module_idP].common_channels[CC_id].bcch_active = 0;
    
#ifdef Rel10
    eNB_mac_inst[module_idP].common_channels[CC_id].mcch_active =0;
#endif
    
    eNB_mac_inst[module_idP].frame    = frameP;
    eNB_mac_inst[module_idP].subframe = subframeP;
  }

  //if (subframeP%5 == 0)
  //#ifdef EXMIMO
  ctxt.enb_module_id = module_idP;
  ctxt.ue_module_id  = 0;
  ctxt.frame         = frameP;
  ctxt.enb_flag      = ENB_FLAG_YES;
  pdcp_run(&ctxt);
  //#endif

  // check HO
  rrc_rx_tx(module_idP,
            frameP,
            1,
            module_idP,
            CC_id);

#ifdef Rel10
  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++) {
    if (eNB_mac_inst[module_idP].common_channels[CC_id].MBMS_flag >0) {
      start_meas(&eNB_mac_inst[module_idP].schedule_mch);
      mbsfn_status[CC_id] = schedule_MBMS(module_idP,CC_id,frameP,subframeP);
      stop_meas(&eNB_mac_inst[module_idP].schedule_mch);
    }
  }
#endif
  // refresh UE list based on UEs dropped by PHY in previous subframe
  /* 
  i=UE_list->head;
  while (i>=0) {
    next_i = UE_list->next[i];
    LOG_T(MAC,"UE %d : rnti %x, stats %p\n",i,UE_RNTI(module_idP,i),mac_xface->get_eNB_UE_stats(module_idP,0,UE_RNTI(module_idP,i)));
    if (mac_xface->get_eNB_UE_stats(module_idP,0,UE_RNTI(module_idP,i))==NULL) {
      mac_remove_ue(module_idP,i,frameP);
    }
    i=next_i;
  }
  */

  switch (subframeP) {
  case 0:
    // FDD/TDD Schedule Downlink RA transmissions (RA response, Msg4 Contention resolution)
    // Schedule ULSCH for FDD or subframeP 4 (TDD config 0,3,6)
    // Schedule Normal DLSCH

    schedule_RA(module_idP,frameP,subframeP,2,nprb,nCCE);

    if (mac_xface->lte_frame_parms->frame_type == FDD) {  //FDD
      schedule_ulsch(module_idP,frameP,cooperation_flag,0,4,nCCE);//,calibration_flag);
    }
    else if  ((mac_xface->lte_frame_parms->tdd_config == TDD) || //TDD
        (mac_xface->lte_frame_parms->tdd_config == 3) ||
        (mac_xface->lte_frame_parms->tdd_config == 6))
      //schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,4,nCCE);//,calibration_flag);


      // schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);

      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,1,mbsfn_status);
    break;

  case 1:
    // TDD, schedule UL for subframeP 7 (TDD config 0,1) / subframeP 8 (TDD Config 6)
    // FDD, schedule normal UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == TDD) { // TDD
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 0:
        case 1:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,7,nCCE);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        case 6:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,8,nCCE);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else {  //FDD
      schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
      schedule_ulsch(module_idP,frameP,cooperation_flag,1,5,nCCE);
    }
    break;

  case 2:
    // TDD, nothing
    // FDD, normal UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == FDD) {  //FDD
      schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
      schedule_ulsch(module_idP,frameP,cooperation_flag,2,6,nCCE);
    }
    break;

  case 3:
    // TDD Config 2, ULSCH for subframeP 7
    // TDD Config 2/5 normal DLSCH
    // FDD, normal UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == TDD) {
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 2:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,7,nCCE);
          // no break here!
        case 5:
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else { //FDD
      schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
      schedule_ulsch(module_idP,frameP,cooperation_flag,3,7,nCCE);
    }
    break;

  case 4:
    // TDD Config 1, ULSCH for subframeP 8
    // TDD Config 1/2/4/5 DLSCH
    // FDD UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == 1) { // TDD
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 1:
          //        schedule_RA(module_idP,frameP,subframeP,nprb,nCCE);
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,8,nCCE);
          // no break here!
        case 2:
          // no break here!
        case 4:
          // no break here!
        case 5:
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,1,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else {
        if (mac_xface->lte_frame_parms->frame_type == FDD) {  //FDD
	  schedule_RA(module_idP,frameP, subframeP, 0, nprb, nCCE);
            //	schedule_ulsch(module_idP, frameP, cooperation_flag, 4, 8, nCCE);
            //schedule_ue_spec(module_idP, frameP, subframeP, nprb, nCCE, mbsfn_status);
	  fill_DLSCH_dci(module_idP, frameP, subframeP, RBalloc, 1, mbsfn_status);

        }
    }
    break;

  case 5:
    // TDD/FDD Schedule SI
    // TDD Config 0,6 ULSCH for subframes 9,3 resp.
    // TDD normal DLSCH
    // FDD normal UL/DLSCH
    schedule_SI(module_idP,frameP,nprb,nCCE);
    //schedule_RA(module_idP,frameP,subframeP,5,nprb,nCCE);
    if ((mac_xface->lte_frame_parms->frame_type == FDD) ) {
        //      schedule_RA(module_idP,frameP,subframeP,1,nprb,nCCE);
        //      schedule_ulsch(module_idP,frameP,cooperation_flag,5,9,nCCE);
        fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);

    }
    else if ((mac_xface->lte_frame_parms->tdd_config == 0) || // TDD Config 0
        (mac_xface->lte_frame_parms->tdd_config == 6)) { // TDD Config 6
        //schedule_ulsch(module_idP,cooperation_flag,subframeP,nCCE);
        fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    else {
        //schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
        fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    break;

  case 6:
    // TDD Config 0,1,6 ULSCH for subframes 2,3
    // TDD Config 3,4,5 Normal DLSCH
    // FDD normal ULSCH/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == TDD) { // TDD
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 0:
          break;
        case 1:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,2,nCCE);
          //	schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        case 6:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,3,nCCE);
          //	schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        case 5:
          schedule_RA(module_idP,frameP,subframeP,2,nprb,nCCE);
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,1,mbsfn_status);
          break;
        case 3:
        case 4:
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;

        default:
          break;
        }
    }
    else {  //FDD
        //      schedule_ulsch(module_idP,frameP,cooperation_flag,6,0,nCCE);
        schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
        fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    break;

  case 7:
    // TDD Config 3,4,5 Normal DLSCH
    // FDD Normal UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == TDD) { // TDD
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 3:
        case 4:
          //	  schedule_RA(module_idP,frameP,subframeP,3,nprb,nCCE);  // 3 = Msg3 subframeP, not
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status); //1,mbsfn_status);
          break;
        case 5:
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else {  //FDD
      //schedule_ulsch(module_idP,frameP,cooperation_flag,7,1,nCCE);
      schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    break;

  case 8:
    // TDD Config 2,3,4,5 ULSCH for subframeP 2
    //
    // FDD Normal UL/DLSCH
    if (mac_xface->lte_frame_parms->frame_type == TDD) { // TDD
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 2:
        case 3:
        case 4:
        case 5:

          //	schedule_RA(module_idP,subframeP,nprb,nCCE);
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,2,nCCE);
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else {  //FDD
      //schedule_ulsch(module_idP,frameP,cooperation_flag,8,2,nCCE);
      schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
      fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    break;

  case 9:
    // TDD Config 1,3,4,6 ULSCH for subframes 3,3,3,4
    if (mac_xface->lte_frame_parms->frame_type == TDD) {
        switch (mac_xface->lte_frame_parms->tdd_config) {
        case 1:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,3,nCCE);
          schedule_RA(module_idP,frameP,subframeP,7,nprb,nCCE);  // 7 = Msg3 subframeP, not
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,1,mbsfn_status);
          break;
        case 3:
        case 4:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,3,nCCE);
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        case 6:
          schedule_ulsch(module_idP,frameP,cooperation_flag,subframeP,4,nCCE);
          //schedule_RA(module_idP,frameP,subframeP,nprb,nCCE);
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        case 2:
        case 5:
          //schedule_RA(module_idP,frameP,subframeP,nprb,nCCE);
          schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
          fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
          break;
        default:
          break;
        }
    }
    else {  //FDD
      //     schedule_ulsch(module_idP,frameP,cooperation_flag,9,3,nCCE);
        schedule_ue_spec(module_idP,frameP,subframeP,nprb,nCCE,mbsfn_status);
        fill_DLSCH_dci(module_idP,frameP,subframeP,RBalloc,0,mbsfn_status);
    }
    break;

  }

  for (CC_id=0;CC_id<MAX_NUM_CCs;CC_id++)
    DCI_pdu[CC_id]->nCCE = nCCE[CC_id];
  LOG_D(MAC,"frameP %d, subframeP %d nCCE %d\n",frameP,subframeP,nCCE[0]);

  stop_meas(&eNB_mac_inst[module_idP].eNB_scheduler);
  vcd_signal_dumper_dump_function_by_name(VCD_SIGNAL_DUMPER_FUNCTIONS_ENB_DLSCH_ULSCH_SCHEDULER,VCD_FUNCTION_OUT);
 
}