PODS '99 Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Smooth is better than sharp: a random mobility model for simulation of wireless networks
MSWIM '01 Proceedings of the 4th ACM international workshop on Modeling, analysis and simulation of wireless and mobile systems
High-performance spatial indexing for location-based services
WWW '03 Proceedings of the 12th international conference on World Wide Web
Journal of Computer and System Sciences - Special issue on PODS 2000
Efficient constraint processing for location-aware computing
Proceedings of the 6th international conference on Mobile data management
Location-based Services: Fundamentals and Operation
Location-based Services: Fundamentals and Operation
A Threshold-Based Algorithm for Continuous Monitoring of k Nearest Neighbors
IEEE Transactions on Knowledge and Data Engineering
Anonymous user tracking for location-based community services
LoCA'06 Proceedings of the Second international conference on Location- and Context-Awareness
Efficient proximity detection among mobile targets with dead reckoning
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
Extending the LBS-framework TraX: Efficient proximity detection with dead reckoning
Computer Communications
Efficient indoor proximity and separation detection for location fingerprinting
Proceedings of the 1st international conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications
Continuous proximity monitoring in road networks
Proceedings of the 16th ACM SIGSPATIAL international conference on Advances in geographic information systems
Efficient clique detection among mobile targets
Mobility '08 Proceedings of the International Conference on Mobile Technology, Applications, and Systems
EnTracked: energy-efficient robust position tracking for mobile devices
Proceedings of the 7th international conference on Mobile systems, applications, and services
Direction-based proximity detection algorithm for location-based services
WOCN'09 Proceedings of the Sixth international conference on Wireless and Optical Communications Networks
A declarative approach to a user-centric markup language for location-based services
Mobility '09 Proceedings of the 6th International Conference on Mobile Technology, Application & Systems
Zone-based rss reporting for location fingerprinting
PERVASIVE'07 Proceedings of the 5th international conference on Pervasive computing
Energy-accuracy trade-off for continuous mobile device location
Proceedings of the 8th international conference on Mobile systems, applications, and services
Demonstrating EnTracked a system for energy-efficient position tracking for mobile devices
Proceedings of the 12th ACM international conference adjunct papers on Ubiquitous computing - Adjunct
Exploring the potential in practice for opportunistic networks amongst smart mobile devices
Proceedings of the 19th annual international conference on Mobile computing & networking
Efficient proximity detection among mobile objects in road networks with self-adjustment methods
Proceedings of the 21st ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems
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Proximity and separation detection are high-level functions for supporting proactive location-based community services. Proximity detection automatically triggers an alert as soon as a pair of mobile target persons approaches each other closer than a pre-defined distance, while separation detection generates an alert when two targets depart from each other more than a pre-defined distance. For both functions it is necessary to permanently track the positions of all target persons joining the community and correlate their position fixes. To realize proactive proximity and separation detection, different strategies for exchanging position fixes between GPS-capable mobile devices and a central location server are presented in this paper. The goal of the strategies is to minimize the amount of messages exchanged at the air interface and thus to save valuable bandwidth, monetary costs the tracked targets have to spend for bearer services like GPRS, and battery consumption of the mobile devices. Furthermore, the paper presents the results of simulations that has been performed in order to compare the proposed update strategies and describes experiences achieved with a prototype implementation.