• Title/Summary/Keyword: BCMCS(Broadcast and Multicast Services)

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Adaptive Error Recovery in cdma2000 1xEV-DO Broadcast and Multicast Networks (cdma2000 1xEV-DO를 위한 모바일 브로드캐스트/멀티캐스트 네트워크에서의 능동적인 에러 교정 방법에 관한 연구)

  • Kang Kyungtae;Park Hosang;Cho Yongwoo;Shin Heonshik
    • Journal of KIISE:Information Networking
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    • v.33 no.1
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    • pp.91-102
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    • 2006
  • We analyze the performance of MAC-layer Reed-Solomon error recovery in the cdma2000 1xEV-DO Broadcast and Multicast Services (BCMCSs) environment, with respect to the size of the ECB (Error Control Block) and the air-channel condition, and establish the relationship between ECB size, error recovery capacity and service latency. From this we propose an adaptive error recovery scheme which adjusts the size of the ECB to reflect the environment of the mobile nodes so as to meet the required service quality (target bit error-rate), while reducing the latency of real-time applications. Extensive simulation results show the effectiveness of our approach compared to the current static scheme. Proposed adaptive schemes achieves near optimal solution with respect to service latency while satisfying the required service quality.

A Utility-Based Hybrid Error Recovery Scheme for Multimedia Transmission over 3G Cellular Broadcast Networks (3G 방송망에서의 효율적인 멀티미디어 전송을 위한 유틸리티 기반 하이브라드 에러 복구기법)

  • Kang Kyung-Tae;Cho Yong-Jin;Cho Yong-Woo;Cho Jin-Sung;Shin Heon-Shik
    • Journal of KIISE:Information Networking
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    • v.33 no.4
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    • pp.333-342
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    • 2006
  • 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.