Comprehensively Context-Aware Approach to Guaranteeing Multimedia Conferencing Services  

上下文综合感知的多媒体会议服务质量保障方法(英文)

作　　者：吴冀衍 田岳 程渤 商彦磊 

机构地区：[1]State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications

出　　处：《China Communications》2013年第9期53-64,共12页中国通信（英文版）

基　　金：supported by the NationalBasic Research Program of China(973 Program)under Grants No.2011CB302506,No.2011CB302704,No.2012CB315802;the National Key Technologies Research and Development Program of China"Research on theMobile Community Cultural Service Aggregation Supporting Technology"under Grant No.2012BAH94F02;the Novel Mobile ServiceControl Network Architecture and Key Technologies under Grant No.2010ZX03004001-01;the National High Technical Researchand Development Program of China(863 Program)under Grant No.2013AA102301;the National Natural Science Foundation of Chinaunder Grants No.61003067,No.61171102,No.61001118,No.61132001;Program for NewCentury Excellent Talents in University underGrant No.NCET-11-0592;the Project of NewGeneration Broadband Wireless Network under Grant No.2011ZX03002-002-01;the Beijing Nova Program under Grant No.2008B50

摘　　要：Service-Oriented Communication(SOC)is a key research issue to enable media communications using the Service-Oriented Architecture(SOA).Motivated by the necessity to guarantee the service quality of our webbased multimedia conferencing system,we present 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 metrics and corresponding contexts in an isolated manner.In this paper,we propose a novel approach to leveraging such relationships in a comprehensive manner based on Bayesian networks and the fuzzy set theory.This approach includes three phases:1)information feedback and training,2)QoS-to-context mapping,and3)optimal context adaption.We implement the proposed CoCA in the real multimedia conferencing system and compare its performance with the existing bandwidth aware and playback buffer aware schemes.Experimental results show that the proposed CoCA outperforms 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.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.

关 键 词：SOC multimedia conferencing CONTEXT-AWARE 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术]