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Issue No. 12 - December (2006 vol. 5)
ISSN: 1536-1233
pp: 1734-1748
Hui Chen , Department of Computer Science, The University of Memphis, 373 Dunn Hall, Memphis, TN 38152
Yang Xiao , Department of Computer Science, The University of Alabama, Tuscaloosa, AL 35487
Xuemin Shen , Shen is with the Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Cache has been applied for wireless data access with different replacement policies in wireless networks. Most of the current cache replacement schemes are access-based replacement policies since they are based on object access frequency/recency information. Access-based replacement policies either ignore or do not focus on update information. However, update information is extremely important since it can make access information almost useless. In this paper, we consider two fundamental and strongly consistent access algorithms: poll-per-read (PER) and call-back (CB). We propose a server-based PER (SB-PER) cache access mechanism in which the server makes replacement decisions and a client-based CB cache access mechanism in which clients make replacement decisions. Both mechanisms have been designed to be suitable for using both update frequency and access frequency. We further propose two update-based replacement policies, least access-to-update ratio (LA2U) and least access-to-update difference (LAUD). We provide a thorough performance analysis via extensive simulations for evaluating these algorithms in terms of access rate, update rate, cache size, database size, object size, etc. Our study shows that although effective hit ratio is a better metric than cache hit ratio, it is a worse metric than transmission cost, and a higher effective hit ratio does not always mean a lower cost. In addition, the proposed SB-PER mechanism is better than the original PER algorithm in terms of effective hit ratio and cost, and the update-based policies outperform access-based policies in most cases
cache storage, data communication, radio access networks

Hui Chen, Yang Xiao and Xuemin Shen, "Update-Based Cache Access and Replacement in Wireless Data Access," in IEEE Transactions on Mobile Computing, vol. 5, no. 12, pp. 1734-1748, 2007.
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