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adaptive delay and synchronization control for Wi-Fi based mobile AV conferencing

WIRELESS PERSONAL COMMUNICATIONS 2005年第1-2期34卷 143-162页

作者： Liu, HN El Zarki, M Univ Calif Irvine Donald Bren Sch Informat & Comp Sci Irvine CA 92697 USA

The tremendous success of the IEEE 802.11b technology and the popularity of portable computing units (e. g., PDAs) have led to a surge of Wi-Fi based real-time multimedia applications. However, due to the unpredictable and often fluctuating channel behavior, it is rather difficult to configure an appropriate de-jitter buffer to maintain a satisfactory perceived quality for end users. Motivated by this problem, we propose in this paper an adaptive delay and synchronization control scheme for Wi-Fi based AV conferencing applications. We target at campus-wide IEEE802.11b WLANs that are generally capable of supporting low-latency multimedia applications. The proposed scheme employs a distributed timing mechanism and performs localized control at the receiver side. The scheme can also be configiured flexibly with either one of the two inter-stream synchronization control options. Based on real-time monitored synchronization errors, Media Data Unit (MDU) loss, and real-time statistical estimation of the delay jitter among adjacent MDUs, the scheme is able to piece-wisely adjust the equalization delay to compensate for the delay jitter and control the MDU loss effectively. We investigate the performance of the proposed scheme using trace-driven approach. Through simulations, we show that the proposed scheme is capable of dynamically balancing between synchronization and latency requirements and effectively control the MDU loss as well. In particular, compared to the solutions using a static setting, the proposed scheme is able to provide the same MDU loss performance with a significant reduction in resultant latency.

关键词： Wi-Fi AV conferencing adaptive delay and synchronization control

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Towards robust AV conferencing on next-generation networks

Towards robust AV conferencing on next-generation networks

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Conference on Multimedia Computing and Networking 2005

作者： Liu, HN Cheng, L El Zarki, M Univ Calif Irvine Sch Informat & Comp Sci Irvine CA 92697 USA

ISBN: (纸本)0819456535

In order to enable a truly pervasive computing environment, next generation networks (including B3G and 4G) will merge the broadband wireless and wireline networking infrastructure. However, due to the tremendous complexity in administration and the unreliability of the wireless channel, provision of hard-guarantees for services on such networks will not happen in the foreseeable future. This consequently makes it particularly challenging to offer viable AV conferencing services due to their stringent synchronization, delay and data fidelity requirements. We propose in this paper a robust application-level solution for wireless mobile AV conferencing on B3G/4G networks. Expecting no special treatment from the network, we apply a novel adaptive delay and synchronization control mechanism to maintain the synchronization and reduce the latency as much as possible. We also employ a robust video coding technique that has better error-resilience capability. We investigate the performance of the proposed solution through simulations using a three-state hidden Markov chain as the generic end-to-end transport channel model. The results show that our scheme yields tight synchronization performance, relatively low end-to-end latency and satisfactory presentation quality. The scheme successfully provides a fairly robust AV conferencing service.

关键词： B3G/4G networks AV conferencing adaptive delay and synchronization control error-resilient video coding

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