An integrated framework for efficient transport of real-time MPEG video over ATM best effort service

This paper describes a framework for the transport of real-time multimedia traffic generated by MPEG-2 applications over ATM networks using an enhance d UBR best effort service (UBR+). Based on the factors affecting the pictur e quality during transmission, we propose an efficient and cost-effective A TM best effort delivery service. The proposed framework integrates three ma jor components: 1) a dynamic frame-level priority assignment mechanism base d 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 vi deo discard scheme named FEC-PSD, which adaptively and selectively adjusts cell drop levels to switch buffer occupancy, video cell payload type and fo rward error correction capability of the destination. The overall best-effo rt video delivery framework is evaluated using ATM network simulation and M PEG2 video traces. The ultimate goal of this framework is twofold: First, m inimizing loss of critical video data with bounded end-to-end delay for arr iving cells and second, reducing the bad throughput crossing the network du ring congestion. Compared to previous approaches, performance evaluation sh ows a good protection of Predictive coded (P-) and Bidirectional Predictive coded (B-) frames at the MPEG video slice layer, (C) 2001 Academic Press.