A caching algorithm for location-aware information disseminated through broadcast media

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A caching algorithm for location-aware information disseminated through broadcast media

Sato, K. / Saisho, K. / Fukuda, A.

ITS (Intelligent Transport Systems) has become a popular theme of research nowadays to solve traffic problems such as traffic congestion, accidents and environmental deterioration through the application of telecommunications technology. Some platforms of in-vehicle computer systems with mobile communication capability, have been proposed recently. A common mobile communication method of these systems is a cellular phone network, which is relatively slow. Meanwhile, high performance and low cost digital satellite or terrestrial broadcasting for mobile hosts that will be available in a few years, should be considered as major communication media for ITS. However, broadcast delivery methods have the drawback that clients need to wait for the required data items to appear on the broadcast channel. The authors propose a cache system to reduce the waiting time especially for location-aware information that are often managed on in-vehicle computers. With the cache system, a data item is prefetched and replaced at an appropriate timing according to the mobility specification. We numerically evaluate the cache system on a model close to the traffic road environment. We also implement the cache system to disseminate geographic map data to in-vehicle computer systems.