Group Monitoring in Mobile Ad-Hoc Networks

Abstract. Maintaining bonds of cohesion between members of small groups in densely populated venues (e.g., a family in an amusement park, or some friends in a stadium) is increasingly gaining interest, both as a safety measure against malicious activity and as a convenient tool to prevent group splitting. Note that the use of mobile phones is often ruled out in such scenarios, due to extreme network load. Current solutions are typically based on custom installations of antennas, centralized control, and user devices with high transmission power. In this work we propose a novel method for anonymously spreading presence information among group members in dense environments, based on a completely decentralized mobile ad hoc network approach. Our system operates independently of any infrastructure and is targetted at resource constrained, inexpensive and expendable user devices. Quite importantly, our system protects the privacy of its users, both for their safety and for ethical reasons. Key words: Ad hoc, MANET, group monitoring, presence management