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
IEEE Transactions on Multimedia
TSync: a new synchronization framework for multi-site 3D tele-immersion
Proceedings of the 20th international workshop on Network and operating systems support for digital audio and video
QoS and resource management in distributed interactive multimedia environments
Multimedia Tools and Applications
SyncCast: synchronized dissemination in multi-site interactive 3D tele-immersion
MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems
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The prevalence of the IEEE 802.11 b technology has made Wi-Fi based Audio/Video (AV) conferencing applications a viable service. However, due to the "best-effort" transport service and other unpredictable factors such as user mobility, location and background traffic, the transport channel behavior often fluctuates drastically. It thus becomes rather difficult to configure an appropriate de-jitter buffer to maintain the temporal fidelity of the AV presentation. We propose in this paper an adaptive delay and synchronization control scheme for AV conferencing applications over campus-wide WLANs. Making use of a distributed timing mechanism, the scheme monitors the synchronization errors and estimates the delay jitters among adjacent Media Data Units (MDUs) in real-time. It piece-wisely controls the equalization delay to compensate for the delay jitters experienced by MDUs in a closed-loop manner.We investigate the performance of the proposed scheme through trace-driven simulations. We collected network traces from a production campus-wide IEEE 802.11 b WLAN by emulating real conferencing sessions. Simulation results show that the scheme is capable of dynamically balancing between synchronization requirements and latency requirements in all scenarios. Small synchronization phase distortions, low MDU loss percentages and low average end-to-end delay can be achieved simultaneously. In particular, compared with solutions using a static setting, the proposed scheme is able to achieve a reduction of around 100ms in end-to-end delay with the same amount of MDU losses under some media-unfriendly situations.