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.
Mobile computing, location-dependent information, cache replacement, cache invalidation, semantic caching, performance evaluation
Databases and Information Systems | Numerical Analysis and Scientific Computing
Data Management and Analytics
IEEE Transactions on Computers
ZHENG, Baihua; XU, Jianliang; and LEE, Dik Lun.
Cache Invalidation and Replacement Strategies for Location-Dependent Data in Mobile Environments. (2002). IEEE Transactions on Computers. 51, (10), 1141-1153. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/121
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