Open Access

Broadcasted Location-Aware Data Cache for Vehicular Application

EURASIP Journal on Embedded Systems20072007:029391

https://doi.org/10.1155/2007/29391

Received: 15 October 2006

Accepted: 17 April 2007

Published: 7 May 2007

Abstract

There has been increasing interest in the exploitation of advances in information technology, for example, mobile computing and wireless communications in ITS (intelligent transport systems). Classes of applications that can benefit from such an infrastructure include traffic information, roadside businesses, weather reports, entertainment, and so on. There are several wireless communication methods currently available that can be utilized for vehicular applications, such as cellular phone networks, DSRC (dedicated short-range communication), and digital broadcasting. While a cellular phone network is relatively slow and a DSRC has a very small communication area, one-segment digital terrestrial broadcasting service was launched in Japan in 2006, high-performance digital broadcasting for mobile hosts has been available recently. However, broadcast delivery methods have the drawback that clients need to wait for the required data items to appear on the broadcast channel. In this paper, we propose a new cache system to effectively prefetch and replace broadcast data using "scope" (an available area of location-dependent data) and "mobility specification" (a schedule according to the direction in which a mobile host moves). We numerically evaluate the cache system on the model close to the traffic road environment, and implement the emulation system to evaluate this location-aware data delivery method for a concrete vehicular application that delivers geographic road map data to a car navigation system.

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Authors’ Affiliations

(1)
Department of Information Systems Design, Doshisha University
(2)
Graduate School of Information Science and Electrical Engineering, Kyushu University

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Copyright

© Kenya Sato et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.