Packet audio playout delay adjustment: performance bounds and algorithms
Multimedia Systems
Adaptive multimedia synchronization in a teleconference system
Multimedia Systems
Analysis of a local-area wireless network
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Proceedings of the 7th annual international conference on Mobile computing and networking
Characterizing user behavior and network performance in a public wireless LAN
SIGMETRICS '02 Proceedings of the 2002 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Analysis of a campus-wide wireless network
Proceedings of the 8th annual international conference on Mobile computing and networking
Measuring the Impact of Slow User Motion on Packet Loss and Delay over IEEE 802.11b Wireless Links
LCN '03 Proceedings of the 28th Annual IEEE International Conference on Local Computer Networks
Adaptive Delay and Synchronization Control for Wi-Fi Based AV Conferencing
QSHINE '04 Proceedings of the First International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks
Characterizing mobility and network usage in a corporate wireless local-area network
Proceedings of the 1st international conference on Mobile systems, applications and services
Adaptive playout scheduling and loss concealment for voice communication over IP networks
IEEE Transactions on Multimedia
Human perception of jitter and media synchronization
IEEE Journal on Selected Areas in Communications
Multipoint multimedia teleconference system with adaptive synchronization
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
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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.