Essential JNI: Java Native Interface
Essential JNI: Java Native Interface
Developing a context-aware electronic tourist guide: some issues and experiences
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
A scalable location service for geographic ad hoc routing
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
RAJA: a resource-adaptive Java agent infrastructure
Proceedings of the fifth international conference on Autonomous agents
Intercepting mobile communications: the insecurity of 802.11
Proceedings of the 7th annual international conference on Mobile computing and networking
Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
Essential JMF: Developer's Java Media Players
Essential JMF: Developer's Java Media Players
A Robust Header Compression Simulator & Visualizer
ARCS '02 Proceedings of the International Conference on Architecture of Computing Systems: Trends in Network and Pervasive Computing
TCP performance issues over wireless links
IEEE Communications Magazine
MINE and MILE: improving connectivity in mobile ad-hoc networks
ACM SIGMOBILE Mobile Computing and Communications Review
Performance evaluation of protocols for group-oriented mobile services
Mobile Networks and Applications
International Journal of Network Management
A middleware framework for managing transactions in group-oriented mobile commerce services
Decision Support Systems
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More and more cities and municipal organizations start to offer services restricted to their metropolitan area. Today, many of these service are located in the field of e-government, allowing citizens to perform many of their administrative duties online. However, with wireless networks and mobile devices becoming more powerful and much less expensive, a broad variety of new mobile services can be envisioned. In this paper, we investigate metropolitan services to support mobile virtual groups, i.e., groups of mobile users who have some kind of logical association with each other, but who are distributed throughout the city and are mobile, meaning they might be constantly on the move. As two major services that such groups would like to make use of, we identified voice group communication and localization of group members. In mobile environments, both services pose a number of problems. Based on a typical metropolitan area network infrastructure, we develop solutions for these problems. We also show how these solutions can be integrated into a mobile group application, namely, the communication and localization component of a virtual tourist guide for the city of Heidelberg using members of a tourist group which can move independently but still keep in touch. We also describe measurements and experiences to argue for the feasibility of our approach.