Comprehensively Context-Aware Approach to Guaranteeing Multimedia Conferencing Services

• Published in: China communications Vol. 10; no. 9; pp. 53 - 64
• Main Authors: Wu, Jiyan, Tian, Yue, Cheng, Bo, Shang, Yanlei
• Format: Journal Article
• Language: English
• Published: China Communications Magazine Co. Ltd 01.09.2013
• Subjects: context-aware; Context-aware services; Measurement; Multimedia communication; multimedia conferencing; PSNR; Quality of service; Service-oriented architecture; SOC; Streaming media; 上下文; 可口可乐; 多媒体会议系统; 峰值信噪比; 感知; 模糊集理论; 网络工程; 面向服务的架构
• ISSN: 1673-5447
• DOI: 10.1109/CC.2013.6623503

Service-Oriented Communication （SOC） is a key research issue to enable media communications using the Service-Oriented Architecture （SOA）. Motivated by the neces- sity to guarantee the service quality of our web- based multimedia conferencing system, we pr- esent a Comprehensively Context-Aware （CoCA） approach in this paper. One major problem in the existing end-to-end Quality of Service （QoS） management solutions is that they analyse and exploit the relationships between the QoS me- trics and corresponding contexts in an isolated manner. In this paper, we propose a novel app- roach to leveraging such relationships in a comprehensive manner based on Bayesian net- works and the fuzzy set theory. This approach includes three phases： 1） information feedback and training, 2） QoS-to-context mapping, and 3） optimal context adaption. We implement the proposed CoCA in the real multimedia con- ferencing system and compare its performance with the existing bandwidth aware and play- back buffer aware schemes. Experimental re- sults show that the proposed CoCA outper- forms the competing approaches in improving the average video Peak Signal-to-Noise Ratio （PSNR）. It also exhibits good performance in preventing the playback buffer starvation.