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>The Uplink Framing Sequence• Uplink framing is relatively simpler than the downlink framing, sincethe space occupied by the control channels is fixed• PUCCH <strong>and</strong> RACH allocations are made first• All non-adaptive synchronous HARQ retransmission elements arescheduled next• If an HARQ retransmission collided with RACH, it is fitted in an open“segment” large enough to accommodate it. All such adaptive HARQretransmissions are scheduled next• All msg3 grants given in the r<strong>and</strong>om access response (msg2) messagesof the r<strong>and</strong>om access procedure are scheduled next• Finally, new grants are given in the remaining open segments to theUEs that are not already under retransmissionsCONFIDENTIAL ─ 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.54
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