Trustworthiness QoS Driven Service Selection in the Context of Environment

With the increase of the number of web services on the Internet, QoS driven service selection as an important way to satisfy user´s constraint on quality and maintain the runtime performance of services, has received much attention. The existing QoS driven service selection approaches always assume that the estimated QoS data is effective and trustworthy, which is actually impossible in reality. This paper proposes a method for estimating QoS in the context of environment and evaluating its trustworthiness dynamically. The proposed method considers the characteristics of the environment the service operating, which can give personalized estimated QoS and can make the evaluation adaptable in the dynamic environmental context. The experiments shows the proposed approach can reflect the dependent relation between estimated QoS and the environmental context effectively, and can insure the accuracy of trustworthiness evaluation. Meantime, the proposed service selection approach can improve the actual runtime performance of the selected service.