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>Modulation <strong>and</strong> Coding Schemes• Modulation/coding curves created for MCS indexes from 0 to 28• For some indexes, separate curves defined for the uplink <strong>and</strong> the downlink• Curves created by a bit-level Monte Carlo simulation by assumingtransmission of 1 allocation block• A document has been published on the <strong>LTE</strong> consortium websitedescribing our methodology• Loading the tables in the software• KP op_tbl_modulation_get()• Function wrls_phy_mcs_info_init() in wrls_phy_support.ex.c• Tables loaded in global arrays for UL <strong>and</strong> DL separately• Computing BLER <strong>and</strong> packet drop probability in PHY• wrls_ber pipeline: BLER accessed using the KP op_tbl_mod_ber()• wrls_error pipeline: Calls wrls_phy_burst_decode_success_compute()defined in wrls_phy_support.ex.c• If the burst consists N blocks, <strong>and</strong> if BLER is p, the probability ofsuccessful decoding is (1-p) NCONFIDENTIAL ─ 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.73
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