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An Exponential Indexing Scheme for Broadcast Disk Program in a Single Wireless Channel  

Park, Ki-Young (서강대학교 컴퓨터공학과)
Jung, Sung-Won (서강대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Databases / v.35, no.6, 2008 , pp. 518-532 More about this Journal
Abstract
Broadcast scheme has been widely researched for efficient data delivery in the mobile environment because the downlink capacity of a mobile client is much greater than the uplink capacity, and the power of a mobile client is limited. In the proposed scheme, the index lets the client know when data items would be broadcasted and enables the client to minimize the tuning time and power consumption. Single channel index schemes are fit to flat broadcast that performs well when all the broadcasted data items are accessed with the same probability whereas the multi-disk broadcast scheme is proper when the data access distribution is skewed. The existing index schemes, however, cannot work on the Multi-disk broadcast scheme because they cannot point the replicating data items in a broadcast cycle. This paper proposes a Multi-disk Exponential Index (MDEI) which is a single channel index scheme fit to Multi-disk broadcast scheme. Because MDEI scheme organizes a separate index for each disk, it functions with multi-disk broadcast, resulting in a greater reduction of average access latency than that of other flat-broadcast index schemes when the data access distribution is skewed. The performance evaluation showed that MDEI has a good performance when data access distribution is skewed. MDEI has short average access latency and not much average tuning time when the data access distribution is skewed.
Keywords
Mobile Databases; Wireless Broadcast; Broadcast Disk; Exponential Index;
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