Broadcasted Location-Aware Data Cache for Vehicular Application
© Kenya Sato et al. 2007
Received: 15 October 2006
Accepted: 17 April 2007
Published: 7 May 2007
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.
- ARIB STD-B31 Version 1.5 : Transmission System for Digital Terrestrial Television Broadcasting. Association of Radio Industries, and Businesses, 2003
- ARIB STD-B38 Version 1.3 : Coding, Transmission and Storage Specification for Broadcasting System Based on Home Servers. Association of Radio Industries, and Businesses, 2006
- Matsumura K, Usui K, Kai K, Ishikawa K: Location-aware data broadcasting: an application for digital mobile broadcasting in Japan. Proceedings of the 11th ACM International Conference on Multimedia (MM '03), November 2003, Berkeley, Calif, USA 271-274.Google Scholar
- Pitoura E, Samaras G: Data Management for Mobile Computing. Kluwer Academic Publishers, Norwell, Mass, USA; 1998.MATHView ArticleGoogle Scholar
- Acharya S, Alonso R, Franklin M, Zdonik S: Broadcast disks: data management for asymmetric communication environments. Proceedings of the ACM SIGMOD International Conference on Management of Data, 1995, San Jose, Calif, USA 199-210.
- Barbara D, Imielinski T: Sleepers and workaholics: caching strategies in mobile environments. Proceedings of the ACM SIGMOD International Conference on Management of Data, May 1994, Minneapolis, Minn, USA 1-12.Google Scholar
- Jing J, Bukhres O, Elmagarmid A, Alonso R: Bit-sequences: a new cache invalidation method in mobile environments. In Tech. Rep. CSD-TR-94-074. Department of Computer Science, Purdue University, West Lafayette, Ind, USA; 1995.Google Scholar
- Chow C-Y, Leong HV, Chan ATS: Distributed group-based cooperative caching in a mobile broadcast environment. Proceedings of the 6th International Conference on Mobile Data Management (MDM '05), May 2005, Ayia Napa, Cyprus 97-106.View ArticleGoogle Scholar
- Ercetin O, Tassiulas L: Push-based information delivery in two stage satellite-terrestrial wireless systems. IEEE Transactions on Computers 2001,50(5):506-518. 10.1109/12.926163View ArticleGoogle Scholar
- Birk Y, Kol T: Coding on demand by an informed source (ISCOD) for efficient broadcast of different supplemental data to caching clients. IEEE Transactions on Information Theory 2006,52(6):2825-2830. 10.1109/TIT.2006.874540MATHMathSciNetView ArticleGoogle Scholar
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