Context-aware end-to-end QoS diagnosis and guarantee based on Bayesian network  

作　　者：Lin Xiangtao Cheng Bo Chen Junliang Qiao Xiuquan 

机构地区：[1]State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications,Beijing 100876,P.R.China

出　　处：《High Technology Letters》2012年第1期51-58,共8页高技术通讯（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China （No. 2007AA010302, 2009AA012404）; the National Basic Research Program of China （No. 2007CB307103）; the National Natural Science Foundation of China （No. 60432010, 60802034） ; the Specialized Research Fund for the Doctoral Program of Higher Education （No. 20070013026）.

摘　　要：A systematic approach for end-to-end QoS qualitative diagnosis and quantitative guarantee is proposed to support quality of service （QoS） management on current Internet. An automatic unwatched discretization algorithm for discretizing continuous numeric-values is brought forth to reshape these QoS metrics and contexts into their discrete forms. For QoS qualitative diagnosis, causal relationships between a QoS metric and its contexts are exploited with K2 Bayesian network （BN） structure learning by treating QoS metrics and contexts as BN nodes. A QoS metric node is qualitatively diagnosed to be causally related to its parent context nodes. To guarantee QoS quantitatively, those causal relationships are next modeled quantitatively by BN parameter learning. Then, BN inference can be carried out on the BN. Finally, the QoS metric is guaranteed to a specific value with certain probability by tuning its causal contexts to suitable values suggested by the BN inference. Our approach is validated to be sound and effective by simulations on a peer-to-peer （P2P） network.

关 键 词：CONTEXT context discretization quality of service （QoS） qualitative diagnosis quantitativeguarantee Bayesian network 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TU311.2[自动化与计算机技术—控制科学与工程]