XIR: Efficient Cache Invalidation Strategies for XML Data in Wireless Environments

Jae-Ho CHOI  Sang-Hyun PARK  Myong-Soo LEE  SangKeun LEE  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.4   pp.1337-1345
Publication Date: 2009/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.1337
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Broadcast Systems
wireless computing,  XML,  updating XML,  cache invalidation strategy,  power saving,  access latency,  

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With the growth of wireless computing and the popularity of eXtensible Markup Language (XML), wireless XML data management is emerging as an important research area. In this paper, cache invalidation methodology with XML update is addressed in wireless computing environments. A family of XML cache invalidation strategies, called S-XIR, D-XIR and E-XIR, is suggested. Using S-XIR and D-XIR, the unchanged part of XML data, only its structure changes, can be effectively reused in client caching. E-XIR, which uses prefetching, can further improve access time. Simulations are carried out to evaluate the proposed methodology; they show that the proposed strategies improve both tuning time and access time significantly. In particular, the proposed strategies are on average about 4 to 12 times better than the previous approach in terms of tuning time.