Service Mobility a challenge for semantic support

Information and service data aspects of service mobility are in the focus of this paper. Service platform mechanisms (such as service discovery, composition, brokering and mediation) are crucial for the service and information precision, in particular when user enters service domains with unknown service and information offering. Semantic web service properties, service oriented architectures, and service and information ontology are suggested as tools for upgrading existing service platform mechanisms. However, many of today´s platform solutions cannot be restructured, so the improvements have to be applied on top of the legacy service platform designs and current network service roaming solutions. This is taken into account when practically analysing the design, the implementation efforts, and the performance overhead. We focus on ontology-based service discovery and composition tests, in particular on the organization of the service information /data. Several solutions for discovering and composing the services when entering a new service domain are discussed, and the complexity of the design / implementations and performance penalties of such solutions are considered.