Understanding LTE Model Internals and Interfaces

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1581 Understanding LTE Model Internals and InterfacesDownlink Framing SequenceSet PDCCH symbol times = 3(# of columns anticipated forPDCCH)Create random accessresponses. Adjust number ofRBs available for data.Create CCCH messages.Adjust number of RBsavailable for data.Place HARQ retransmissionMPDUs on the DL. Adjustnumber of RBs available fordata.Schedule new MPDUs. Adjustthe number of RBs availablefor data.More RTX and no more RBsAttempt to resize the PDCCHsize into 1 or 2 columnsNo more RBs AND PDCCH NOT resized alreadyPDCCH resized to 1 or 2 symbolsAttempt to resize the PDCCHsize into 1 or 2 columnsPDCCH cannot be resizedEXITAll buffers empty OR PDCCH resized alreadyCONFIDENTIAL ─ RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc. © 2010 OPNET Technologies, Inc.48
1581 Understanding LTE Model Internals and InterfacesSummarizing the Best Practices forInterfacing a Custom DL Scheduler• Most recommended approach: Adhere to the OPNET architecture• Let OPNET’s frame generator take care of the actual framing for you• Refer to Appendix C for a non-recommended interfacing example• Write two scheduler callbacks of type (declared in lte_sched_sup.h) :• LteT_Scheduling_Q_Selection_Proc• LteT_Scheduling_Bit_Selection_Proc• Set the custom callbacks at the beginning of lte_enb_as_dl_frame_generate()function (defined in lte_enb_as.pr.m).• Pass 3 should always be used. Passes 1 and 2 can be combined into a single pass, ifyour scheduling algorithm had different objectives• Output of the DL frame generator• Created MPDUs• UE context, Number of resource blocks, MCS index, Downlink MPDU,HARQ context• Use the trace lte_frm to examine how the frame is constructed• The trace lte_low_level gives detail information about how each MPDU wasconstructedCONFIDENTIAL ─ RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc. © 2010 OPNET Technologies, Inc.49
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Understanding LTE Model Internals and Interfaces

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