RB Bitmap in LTE DL scheduling

[Ramakrishnan]

Hi, 

I am interested in knowing what is the set of PRBs and RBGs allocated for each UE by the LTE eNB Downlink scheduler. 

I looked through the code and find that the the values could be printed before calling "m_dlScheduling(dlSchedulingCallbackInfo);" in lte-enb-mac.cc

I tried to simulate multiple UE environment and tried switching the scheduler between PF and RR and I see the rbBitmap changing. 

" RGBMAP "    << (uint32_t)ind.m_buildDataList.at(i).m_dci.m_rbBitmap

Just wanted to confirm if this is the correct location to pick this info? 

Also is there a reference that could be used to derive "Coding rate" from allocated TBSize ?

Thanks, 

Rama

*********************************

File: lte-enb-mac.cc

Function: LteEnbMac::DoSchedDlConfigInd (FfMacSchedSapUser::SchedDlConfigIndParameters ind)

  for (  uint32_t i  = 0; i < ind.m_buildDataList.size (); i++ )

    {

      // Only one TB used

      if (ind.m_buildDataList.at (i).m_dci.m_tbsSize.size () == 1)

        {

          DlSchedulingCallbackInfo dlSchedulingCallbackInfo;

          dlSchedulingCallbackInfo.frameNo = m_frameNo;

          dlSchedulingCallbackInfo.subframeNo = m_subframeNo;

          dlSchedulingCallbackInfo.rnti = ind.m_buildDataList.at (i).m_dci.m_rnti;

          dlSchedulingCallbackInfo.mcsTb1=ind.m_buildDataList.at (i).m_dci.m_mcs.at (0);

          dlSchedulingCallbackInfo.sizeTb1 = ind.m_buildDataList.at (i).m_dci.m_tbsSize.at (0);

          dlSchedulingCallbackInfo.mcsTb2 = 0;

          dlSchedulingCallbackInfo.sizeTb2 = 0;

          dlSchedulingCallbackInfo.componentCarrierId = m_componentCarrierId;

          m_dlScheduling(dlSchedulingCallbackInfo);

        }

      // Two TBs used

      else if (ind.m_buildDataList.at (i).m_dci.m_tbsSize.size () == 2)

        {

          DlSchedulingCallbackInfo dlSchedulingCallbackInfo;

          dlSchedulingCallbackInfo.frameNo = m_frameNo;

          dlSchedulingCallbackInfo.subframeNo = m_subframeNo;

          dlSchedulingCallbackInfo.rnti = ind.m_buildDataList.at (i).m_dci.m_rnti;

          dlSchedulingCallbackInfo.mcsTb1=ind.m_buildDataList.at (i).m_dci.m_mcs.at (0);

          dlSchedulingCallbackInfo.sizeTb1 = ind.m_buildDataList.at (i).m_dci.m_tbsSize.at (0);

          dlSchedulingCallbackInfo.mcsTb2 = ind.m_buildDataList.at (i).m_dci.m_mcs.at (1);

          dlSchedulingCallbackInfo.sizeTb2 = ind.m_buildDataList.at (i).m_dci.m_tbsSize.at (1);

          dlSchedulingCallbackInfo.componentCarrierId = m_componentCarrierId;

          m_dlScheduling(dlSchedulingCallbackInfo);

        }

      else

        {

          NS_FATAL_ERROR ("Found element with more than two transport blocks");

        }

[Ramakrishnan]

Just wanted to update - for the query "a reference that could be used to derive "Coding rate" from allocated TBSize",  I came across 3GPP TDoc R1-081483 in the NS3 references (https://www.nsnam.org/docs/models/html/lte-references.html#R1-081483)  that addresses this. 

regards

Rama