Cache invalidation and replacement strategies for location-dependent data in mobile environments

Baihua Zheng*, Jianliang XU, Dik L. Lee

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

149 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1141-1153
Number of pages13
JournalIEEE Transactions on Computers
Issue number10
Publication statusPublished - Oct 2002

Scopus Subject Areas

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computational Theory and Mathematics

User-Defined Keywords

  • Cache invalidation
  • Cache replacement
  • Location-dependent information
  • Mobile computing
  • Performance evaluation
  • Semantic caching


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