Cache Invalidation and Replacement Strategies for Location-Dependent Data in Mobile Environments

Mobile location-dependent information services (LDISs) have become increasingly popular in recent years. However, data caching strategies for LDISs have thus far received little attention. In this paper, we study the issues of cache invalidation and cache replacement for location-dependent data unde...

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Bibliographic Details
Main Authors: ZHENG, Baihua, XU, Jianliang, LEE, Dik Lun
Format: text
Language:English
Published: Institutional Knowledge at Singapore Management University 2002
Subjects:
Online Access:https://ink.library.smu.edu.sg/sis_research/121
https://ink.library.smu.edu.sg/context/sis_research/article/1120/viewcontent/TC02_cache.pdf
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Institution: Singapore Management University
Language: English
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Summary:Mobile location-dependent information services (LDISs) have become increasingly popular in recent years. However, data caching strategies for LDISs have thus far received little attention. In this paper, we study the issues of cache invalidation and cache replacement for location-dependent data under a geometric location model. We introduce a new performance criterion, called caching efficiency, and propose a generic method for location-dependent cache invalidation strategies. In addition, two cache replacement policies, PA and PAID, are proposed. Unlike the conventional replacement policies, PA and PAID take into consideration the valid scope area of a data value. We conduct a series of simulation experiments to study the performance of the proposed caching schemes. The experimental results show that the proposed location-dependent invalidation scheme is very effective and the PA and PAID policies significantly outperform the conventional replacement policies.