MAC PDU Multiplexing Scheme for IEEE 802.16m Document Number: IEEE C802.16m-08/1015r1 Date Submitted: 2008-09-05 Source: Fang-Ching (Frank) Ren, Richard.

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MAC PDU Multiplexing Scheme for IEEE m Document Number: IEEE C802.16m-08/1015r1 Date Submitted: Source: Fang-Ching (Frank) Ren, Richard Li ITRI Yih-Shen Chen MediaTek Inc. Venue: IEEE m-08/033, Call for Contributions and Comments on Project m System Description Document (SDD). - Target topic: Upper MAC (Data Plane Functions) Base Contribution: None Purpose: To be discussed and adopted by TGm for the m SDD Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the Source(s) field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

2 Motivation (1) MPDU multiplexing in e –Multiple MAC PDUs may be concatenated into a single transmission in either the UL or DL directions. Example of MAC PDU concatenation shown in Figure 42 of P802.16Rev2/D6. Drawbacks –Possible error propagation due to MPDU header error –Less efficient for resource allocation

3 Motivation (2) Error Propagation –When MAC header error occurs in MPDU A, There is no valid length indication for MPDU A. It is unavailable to detect MAC header of MPDU B. MPDU B will be regarded as error. Each MPDU needs a length fields –Flexible but not necessary, e.g., VoIP. Therefore, the length field could be condensed. MAC header Payload (optional) CRC (optional) MAC header Payload (optional) CRC (optional) PHY Burst Error MPDU AMPDU B

4 Proposed MPDU Multiplexing Scheme A MS may activate multiple transport service flows and management connections. –To avoid error propagation impact, it is better to split control header and data part. Therefore, the aggregated control headers can be protected with higher level coding. –Dependent on the traffic volume and transmission requirement, each service flow or management connection can be configured for transmission with smaller set of MPDU sizes. A MPDU concatenation index (MCI) can be adopted to indicate the combination of concatenated MPDUs. MCI should be part of resource allocation, e.g., MAP_IE in 16e.

5 Example of MCI –Service Flow 1: Format A, Format B, Format C, –Service Flow 2: Format X, Format Y, Service Flow 1Service Flow 2MCI AX0 AY1 BX2 BY3 CX4 CY5

6 Text Proposal for m SDD 10.x Construction and transmission of MAC PDUs 10.x.1 Concatenation Multiple MAC PDUs may be concatenated into a single transmission in either the UL or DL directions. The control header and data part of MPDUs can be split and protected with different level coding. A MS should negotiate or update the allowable combination of concatenated MPDUs, which are indicated by MPDU concatenation index (MCI), with BS when a new connection is initiated, terminated, or re-configured. MCI should be protected under lower error probability than MPDU data parts to achieve better performance MPDU de- concatenation.