The anatomy of a context-aware application
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Next century challenges: Nexus—an open global infrastructure for spatial-aware applications
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
The Cricket location-support system
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Security Considerations for a Distributed LocationService
Journal of Network and Systems Management
Towards a General Location Service for Mobile Environments
SDNE '96 Proceedings of the 3rd Workshop on Services in Distributed and Networked Environments (SDNE '96)
'Caches in the Air': Disseminating Tourist Information in the Guide System
WMCSA '99 Proceedings of the Second IEEE Workshop on Mobile Computer Systems and Applications
IEEE Communications Magazine
An efficient spatial publish/subscribe system for intelligent location-based services
Proceedings of the 2nd international workshop on Distributed event-based systems
LORE: an infrastructure to support location-aware services
IBM Journal of Research and Development
Dynamic context management for pervasive applications
The Knowledge Engineering Review
Enhancing the map usage for indoor location-aware systems
HCI'07 Proceedings of the 12th international conference on Human-computer interaction: interaction platforms and techniques
LoT-RBAC: a location and time-based RBAC model
WISE'05 Proceedings of the 6th international conference on Web Information Systems Engineering
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Location awareness is an important part of context-aware mobile computing. We present the idea of logical location contexts which provides enhanced privacy and supports specialized notions of distance, and offers a paradigm that unifies location with other types of context. This is developed in the form of a framework consisting of realms, which are collections of spatial states, with realm-maps providing mappings between realms. The lowest realm relies on raw (physical) location. Multiple arbitrary realms are allowed to co-exist. Many applications do not necessarily need access to raw location. With our model, such applications access only states in specified realms of interest, thus supporting location privacy. Policies guard such access at the granularity of realms and states. Provision for specialized realm-specific and state-specific notions of distance enables spatial awareness and reasoning. The framework is presented formally. The ensuing architecture has good properties with respect to privacy, manageability, distribution of computation and scalability.