Optimizing Service Selection by User’s QoS Expectation

QoS is of paramount importance for Web services to function. However, it is a challenging problem to construct services that meet user’s QoS expectation. This paper proposes an optimization method for service selection in constructing applications through service composition. In order to make quality rating accurate, ingredients of service reputation and expectation similarity are included in quality evaluation. Optimization of Web services selection is performed at both basic service level and composite service level, which results in optimized service applications to satisfy user’s QoS expectation. A case study demonstrates feasibility of the method.