1. [A Reliable Multicast Service in 802.16m]
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Document Number: IEEE C80216m-08/1044 r1
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Sunggeun Jin et al.
ETRI
Venue: MAC: data plane; in response to the TGm Call for Contributions and Comments m-08/033
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2. A Reliable Multicast Service in 802.16m
Sunggeun Jin, Sungcheol Chang,
Won-ik Kim, Hyun Lee, and Chulsik Yoon
ETRI

3. Reliable Multicast Service
Purpose
It is used for several Mobile Stations to download data simultaneously.
Software update procedure is a good example for reliable multicast.
It is necessary when it is required that more robust multicast service than multicast via HARQ can provide.

4. Basic Operation Payload RS encoding Payload Parity Segmentation CRC
ARQ transmission
Used for first transmission trial
Used for retransmission

5. Basic Operation (cont.)
Prerequisite
Fragmented (and/or) packed SDUs are encoded with RS encoder.
Encoded payload is segmented into ARQ blocks.
ARQ Feedback Information
Each receiver responses with normal ARQ feedback.
CRC is appended at the end of every n-ARQ blocks.
Retransmission
BS counts the number of maximum ARQ blocks for retransmission by considering MSs’ feedback information, and then, transmits parity blocks on behalf of ARQ retransmission.
When parity blocks are used up, normal ARQ block retransmission is performed.
Comment – HARQ vs ARQ의 cross layer를 고려하자.

6. Text Proposal for SDD
ARQ-based reliable multicast service employing RS coding scheme is provided for multiple receivers, and hence, they can receive large volume of data simultaneously.