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Context representation is a fundamental process in developing context aware systems for the pervasive world. We present a light weight XML based context representation schema called ContextML in which context information is categorized into scopes and related to different types of entities (e.g. user, device). The schema is also applied for encoding(More)
—In the scope of ubiquitous computing, one of the key issues is the awareness of context, which includes diverse aspects of the user's situation including his activities, physical surroundings, location, emotions and social relations, device and network characteristics and their interaction with each other. This contextual knowledge is typically acquired(More)
Mobile multimedia services like news, weather forecasts and mobile television require efficient technologies for distributing multimedia contents simultaneously to large mobile user groups. UMTS (Universal Mobile Telecommunications System) Release 6 standardises MBMS (Mul-timedia Broadcast and Multicast Services) for the first time. This article gives an(More)
Dissemination of context data from context producing entities to context consuming entities is a fundamental functional task of context aware systems. Broker based approaches have been successfully demonstrated in a number of prototype context-aware systems. With the increase in sensing capabilities of mobile devices, such devices are not merely consumers(More)
Context is information that describes the situations in which computing, social and physical interactions take place. The complexity and scope of context information available for utilization by context-consuming applications, such as those executing on smart mobile devices, sensing and tracking platforms, etc. is growing with the increased integration of(More)
Smart spaces are characterised by availability of information from digital artifacts embedded in the environment and network services that unobtrusively enhance our interaction with the digital world. User and environment context plays a vital role in deciding the usability of information services available in a smart space. Making this context available(More)
Ubiquitous Systems as envisaged by Mark Weiser are becoming a reality due to recent developments in mobile computing, sensing and wireless connectivity. Numerous context-aware applications and services have been proposed in different domains. Simultaneously, various concepts and models have been introduced as far as management and representation of(More)