NDLI: Broadcasting and caching policies for location-dependent queries in urban areas

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Broadcasting and caching policies for location-dependent queries in urban areas

Content Provider	ACM Digital Library
Author	You, Young-ho Jung, Il-dong Kim, Kyungsok Lee, Jong-hwan
Abstract	The results of location-dependent queries (LDQ) queries generally depend on the current locations of query issuers. Many mechanisms, e.g. broadcast scheme, hoarding, or caching policy have been developed to improve system performance and provide better service, which are specialized for LDQs. It is necessary to design them considering geographical adjacency and characteristics of target area in LDQ. For this reason, this paper proposes the caching policy and broadcast scheme, which these features are reflected in. To develop the caching policy suitable for LDQ in urban area, we apply the moving distance of MH to our caching policy. Moreover, Based on the adjacency of data in LDQ, our broadcast scheme use space-filling curve to cluster data. We evaluate the performance of the caching policy measuring the workload of MHs and the correctness of LDQ results, and the performance of the broadcast scheme measuring the average setup-time of MHs in our experiments. Finally, we expect that our caching policy provides more correct answers when executing LDQ in local cache and leads significant improvement of the workload of MHs. It also seems quite probable that our broadcast scheme leads improvement of battery life of the MH.
Starting Page	54
Ending Page	60
Page Count	7
File Format	PDF
ISBN	1581136005
DOI	10.1145/570705.570716
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2002-09-28
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Location-dependent query Caching policy Mobile databases Energy conservation Broadcast scheme
Content Type	Text
Resource Type	Article

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