Enhanced Scalable Asynchronous Cache Consistency Scheme for Mobile Environment
Date
2011-01-12T23:07:57Z
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Abstract
An important technique to reduce the contention on the limited bandwidth of wireless channels between
mobile units and base stations is caching frequently accessed data items. In the literature, two approaches
were proposed for cache consistency: Stateful and Stateless. In the Stateful approach, the server has to
keep information about all the mobile units in its cell. On the other hand, in the stateless approach, the
server does not store any information about clients. In this paper, we propose a hybrid cache consistency
approach which combines the advantages of both Stateless and Stateful approaches; our approach has
several characteristics in common with the Scalable Algorithm for Cache Consistency Scheme “SACCS”,
which has been reported to have advantages compared to some major previous algorithms, including
TimeStamps, Signatures, Amnesic Terminals and Asynchronous Stateful. The proposed approach reduces
the side-effect of the sleep-wakeup patterns, and uses new communication messages intended to invalidate
only the entries changed during the sleep time. Further, we propose a better replacement policy for
the mobile unit cache, which considers the size of the removed entry to improve channel utilization.
Experimental results show that the proposed approach increases the mobile cache hit, reduces the delay
time of queries and reduces traffic in both uplink and downlink channels.
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Keywords
Scalable, Asynchronous, Environments