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
A Map-Based Dead-Reckoning Protocol for Updating Location Information
IPDPS '02 Proceedings of the 16th International Parallel and Distributed Processing Symposium
ACM SIGMOBILE Mobile Computing and Communications Review
Efficient proximity detection among mobile targets with dead reckoning
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
A survey on context-aware systems
International Journal of Ad Hoc and Ubiquitous Computing
Schema matching for context-aware computing
UbiComp '08 Proceedings of the 10th international conference on Ubiquitous computing
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A context-aware system is one that gracefully adapts to user environment changes, rendering its applications/services more personalized. Location has been long considered as the most important context and numerous Location Based Services have been introduced. Proximity detection is considered as a high level proactive location based function that detects proximity between two mobile users. This function is needed in diverse applications such as dating services, gaming and child tracking. This paper presents Direction-based Dynamic Shifted Circle (DDSC) approach which takes users direction as context in providing an efficient proximity detection technique. Simulation experiments proved that DDSC outperforms similar algorithms that have been introduced in literature previously, in terms of the number of messages exchanged.