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Personal Mobility, and the need for it, is considered to be the main driving force behind the spreading of the Wireless Internet. Moreover wireless devices and applications are being developed based on a basic assumption that users need to get access to services regardless of their location and used equipment. Wireless Services, on the other hand, are very dynamic and have a vibrant configuration and settings. In order for this to be utilizable a new network architecture is required. In our department we are developing Telecommunication Architecture for Plug-And-play Systems (TAPAS) to be a generic platform and application development environment based on plug-andplay technology, which uses the Web as means for service definition, update and discovery. TAPAS is intended to satisfy three basic classes of properties: Flexible and adaptable, Robust and survivable, and QoS aware. Personal mobility falls into the first class. Aspects of user, application and session mobility are dealt with using different mobility management schemes. The paper discusses trends in the Wireless Internet concerning devices, applications and services, and presents the approach used within TAPAS. Personal mobility in this context is based on the user, terminal and session mobility.

Abstract:Mobility is regarded as the most important feature needed to achieve adaptability and flexibility in the execution of service components. As such, service systems could be able to cope with the handling of dynarnic changes in the availability of resources and position of users. On the other hand, providing user-centric and personal-content driven wide range of services, more commonly wireless ones, to end users regardless of their location and used equipment, seem to be the most important objective of such a feature. Mobility, in this context, is a feature facilitating the free and coordinated movement of, for instance, users, software components, user terminals, etc. One should always consider the vibrant configuration and settings of not only end-users applications a:nd environment, but also the network resources, components and services. The reason is due to the ever changing and increasing demands and requirements in functionality, security, reliability and QoS. Mobility support in self-managing, dynamically configurable network architecture seems to be even more challenging, however recent development and improvements in network infrastructure show a greater prospect for codeon-demand and adaptive network management. TAPAS, and its mobility handling architecture, presented in this paper, tend to give some answers and take a step towards achieving such goals.

Abstract. Service systems are likely to be highly dynamic in terms of changing resources and configurations. On the one hand, resources are increasingly configurable, extendable, and replaceable. On the other hand, their availability is also varying. For this reason, the handling of these changes is crucial to achieve efficiency. To accomplish this objective, a framework for dynamic service management with respect to service specification and adaptation is proposed.