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Dynamic Query Processing Using Description-Based Semantic Prefetching Scheme in Location-Based Services  

Kang, Sang-Won (고려대학교 컴퓨터학과)
Song, Ui-Sung (부산교육대학교 컴퓨터교육과)
Publication Information
Journal of KIISE:Databases / v.34, no.5, 2007 , pp. 448-464 More about this Journal
Abstract
Location-Based Services (LBSs) provide results to queries according to the location of the client issuing the query. In LBS, techniques such as caching and prefetching are effective approaches to reducing the data transmission from a server and query response time. However, they can lead to cache inefficiency and network overload due to the client's mobility and query pattern. To solve these drawbacks, we propose a semantic prefetching (SP) scheme using prefetching segment concept and improved cache replacement policies. When a mobile client enters a new service area, called semantic prefetching area, proposed scheme fetches the necessary semantic information from the server in advance. The mobile client maintains the information in its own cache for query processing of location-dependent data (LDD) in mobile computing environment. The performance of the proposed scheme is investigated in relation to various environmental variables, such as the mobility and query pattern of user, the distributions of LDDs and applied cache replacement strategies. Simulation results show that the proposed scheme is more efficient than the well-known existing scheme for range query and nearest neighbor query. In addition, applying the two queries dynamically to query processing improves the performance of the proposed scheme.
Keywords
Semantic prefetching; Range query; Nearest neighbor query; Cache replacement; Locality;
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