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A Utility-Based Hybrid Error Recovery Scheme for Multimedia Transmission over 3G Cellular Broadcast Networks  

Kang Kyung-Tae (서울대학교 전기 컴퓨터공학부)
Cho Yong-Jin (서울대학교 전기 컴퓨터공학부)
Cho Yong-Woo (서울대학교 전기 컴퓨터공학부)
Cho Jin-Sung (경희대학교 전자정보학부)
Shin Heon-Shik (서울대학교 전기 컴퓨터공학부)
Publication Information
Journal of KIISE:Information Networking / v.33, no.4, 2006 , pp. 333-342 More about this Journal
Abstract
The cdma2000 lxEV - DO mobile communication system provides broadcast and multicast services (BCMCS) to meet an increasing demand from multimedia data services. The servicing of video streams over a BCMCS network must, however, face a challenge from the unreliable and error-prone nature of the radio channel. The BCMCS network uses Reed-Solomon coding integrated with the MAC protocol for error recovery. We analyze this coding technique and show that it is not effective in the case of slowly moving mobiles. To improve the playback quality of an MPEG-4 FGS video stream, we propose the Hybrid error recovery scheme, which combines Reed-Solomon with ARQ, using slots which are saved by reducing the Reed-Solomon coding overhead. The target packets to be retransmitted are prioritized by a utility function to reduce the packet error rate in the application layer within a fixed retransmission budget. This is achieved by considering of the map of the error control block at each mobile node. The proposed Hybrid error recovery scheme also uses the characteristics of MPEG-4 FGS (fine granularity scalability) to improve the video quality even when conditions are adverse: slow-moving nodes and a high error rate in the physical channel.
Keywords
Reed-Solomon; Hybrid error recovery; BCMCS; MPEG-4 FGS;
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