Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
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1581 <strong>Underst<strong>and</strong>ing</strong> <strong>LTE</strong> <strong>Model</strong> <strong>Internals</strong> <strong>and</strong> <strong>Interfaces</strong>Appendix D: H<strong>and</strong>ling of DL HARQRetransmissionslte_enb_as_dl_frame_harq_rtx_process()Find all UEs that should have received<strong>and</strong> processed their acknowledgementsby now: (UEs that transmitted at n-8, <strong>and</strong>all NACKed UEs that got “pushed” tothe current SF). Find the HARQ contextof the UE.ACK || max RTX exceededElseFree the HARQ process for newtransmissions.Examine if resources are available onPDSCH, PDCCH <strong>and</strong> conditionallyPUSCH:lte_enb_as_dl_harq_rxmt_dci_obtain()All resources availableElsePerform retransmission in the currentsubframeFind a future subframe for retransmission:No other HARQ process for this UE shouldbe scheduled for retransmission in that SF.lte_enb_as_async_dl_harq_rtx_perform()CONFIDENTIAL ─ 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.85