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>RLC Features• Segmentation <strong>and</strong> concatenation procedures are performed using a dynamicPDU size that is determined by the scheduler decisions.• The model supports the following RLC modes:• Transparent mode—No RLC header is included in this mode.• Unacknowledged mode—This mode ensures in-sequence delivery of SDUs to thehigher layers.• Acknowledged mode—This mode ensures retransmission of missing SDUs in additionto in-sequence delivery of SDUs to the higher layers.• While transmitting PDUs, an RLC entity in acknowledged mode follows this priorityorder: status report PDU > retransmitted PDU(s) > PDU with new data• While retransmitting RLC AMD PDUs, segmentation of the retransmitted PDUs incases of small maximum allowed PDU sizes is supported• SRBs use RLC UM mode• The RLC mode of the data radio bearers is configurable separately for uplink <strong>and</strong>downlink• Default bearer always uses UM• CCCH transmissions use transparent mode, <strong>and</strong> TM is used only by CCCHtransmissionsCONFIDENTIAL ─ 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.39
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