A FORMALIZED MODEL FOR SEMANTIC WEB SERVICE SELECTION BASED ON QoS PARAMETERS

Selecting the most relevant Web Service according to a client requirement is an onerous task, as there are innumerous functionally same Web Services (WS) that are able to satisfy the request of user. However non-functional attributes also matter a lot. A web Service Selection Process involves two major points: Recommending the pertinent Web Service and avoiding unjustifiable web service. The deficiency in keyword based searching is that it doesn’t handle the client request accurately. UDDI and search engines are based on keyword search, which is insufficient for providing the relevant service. So the search mechanism must be incorporated with the Semantic behavior of Web Services. In order to strengthen this approach, the proposed model is incorporated with Quality of Services (QoS) based Ranking of web services. This paper enlightens on various concepts of Quality of Service associated with web services. Various QoS parameters like performance, availability, reliability and stability etc. are formalized in order to enhance the pertinence of web service selection. A QoS mediator agent based Web Service Selection Model is proposed where QoS Consultant acts as a Mediator Agent between clients and service providers. Model suggests user’s preferences on QoS parameter selection. The proposed model helps to select pertinent Web Service as per user’s requirement and reduce the human intervention