Understanding LTE Model Internals and Interfaces

1581 Understanding LTE Model Internals and InterfacesRLC Code• All RLC functionality resides in models/std/lte/rlc_support.ex.c• The MACRO RLCC_MAX_TX_SDU_COUNT defined in rlc_support.hcontrols the RLC buffer size• Modeled as a constant with a capacity of 1500 packets for each radio bearer: Packetscan be of any size, though typical TCP/IP packets will be at most 1500 bytes• Enqueue/dequeue functions:• rlc_support_rlc_sdu_enqueue()• rlc_support_lte_rlc_pdu_create()• Other important functions• rlc_support_tx_queue_size_in_bits_get(): Get the size of the queue. This is how thescheduler would know if the queue is empty.• rlc_support_is_tx_window_stalled(): This is important for the scheduler to know. Astalled RLC window is treated the same as empty buffer• rlc_support_lte_min_pdu_header_size_get(): This is important for the framegenerator. If it does not have resources to allocate even the minimum RLC PDUheader, it should not allocate any resources at all.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.40