A Framework for enablingService migrationin Ubiquitous Computing

Ubiquitous Computing is a computing paradigm in which applications move with the user. This requires applications to migrate automatically to t he environment the user is present and adapt to different contexts and resource availabilities. An important requirement of a ubiquitous computing system is this automatic adaptation of applications to the new environment. At the time of migration, there c ould be incomplete services that are still in a running state. Such services may have to be suspended and transferred to destination before they are completed. In this paper, we propose a service migration framework for migrating partially executed service s. When multiple destinations are available for the migration, an Ontology Server selects one after evaluating a variety of attributes such as energy level, computational ability, availability etc. Migrations are handled at thread level for accuracy. In pa rticular, migration of response-awaiting-services is handled based on the communication behavior of the service. These services are divided into two categories viz. Continuous -Interaction-Demanding Services and Limited Interaction Services based on the nature of their interaction with the user. Two distinct protocols are then proposed for handling the migration of these services .