An Integrated Framework for Efficient Transport of Real-Time MPEG Video over ATM Best Effort Service
✍ Scribed by Ahmed Mehaoua; Raouf Boutaba; Yasser Rasheed; Alberto Leon-Garcia
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 658 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1077-2014
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✦ Synopsis
his paper describes a framework for the transport of real-time multimedia traffic generated by MPEG-2 applications over ATM networks using an enhanced UBR best effort service (UBR+). Based on the factors affecting the picture quality during transmission, we propose an efficient and cost-effective ATM best effort delivery service. The proposed framework integrates three major components: 1) a dynamic frame-level priority assignment mechanism based on MPEG data structure and feedback from the network (DexPAS), 2) a novel audio-visual AAL5 SSCS with FEC (AV-SSCS), and 3) an intelligent packet video discard scheme named FEC-PSD, which adaptively and selectively adjusts cell drop levels to switch buffer occupancy, video cell payload type and forward error correction capability of the destination. The overall best-effort video delivery framework is evaluated using ATM network simulation and MPEG2 video traces. The ultimate goal of this framework is twofold: First, minimizing loss of critical video data with bounded end-to-end delay for arriving cells and second, reducing the bad throughput crossing the network during congestion. Compared to previous approaches, performance evaluation shows a good protection of Predictive coded (P-) and Bidirectional Predictive coded (B-) frames at the MPEG video slice layer.