Object-oriented middleware for location-aware systems
Proceedings of the 2004 ACM symposium on Applied computing
A middleware approach for reducing the network cost of location traffic in cellular networks
NEW2AN'06 Proceedings of the 6th international conference on Next Generation Teletraffic and Wired/Wireless Advanced Networking
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Location information of the mobile user is critical to many location-based application scenarios. The location information may be used as an input into certain services like finding driving directions from the user's current location to a destination. We may also choose to personalize the services available to the user based on their current position. To enable these services the mobile middleware platform needs to be able access the user's location. Today a number of vendors like Ericsson, Nokia that can provide mobile positioning services (MPS) that can be used to locate the user's mobile device. There is another class of applications, push services triggered by the user's location, that can put heavy demands on the MPS.GPS technology and network based positioning has been researched in great detail. Great strides are being made in improving the performance and accuracy of determining the position of a mobile device. This paper looks at performance and scalability issues in accessing the positioning information in the middleware platform. We discuss an implementation where we allow the application to specify the accuracy of positioning required and then use the user's current location and approximate velocity to determine the location caching policy.