A Coordination Model for Ubiquitous Computing

-This paper presents a coordination model called XCM, intended to conceptualise coordination within ubiquitous computing, and one instantiation of this model called UCM. The constraints brought up to coordination by ubiquitous computing are the need to face immersion within physical environments, a very strong heterogeneity of software and hardware components, and a very high dynamicity and contextsensitivity of applications. XCM is an generic model organized around a few abstract concepts (entity, environment, social law and port) addressing coordination basically in terms of proactive and reactive contextual behaviours. The UCM instantiation allows us to show how XCM concepts can be applied, and to discuss the expression power gained through XCM high level of abstraction. Key-Words: Distributed computing, Ubiquitous systems, Coordination, Service, Composition.