Electing the Query Directory Using PSO in DCIMJournal: International Journal of Engineering Sciences & Research Technology (IJESRT) (Vol.3, No. 6)
Publication Date: 2014-06-30
Authors : S.Mahalakshmi;
Page : 33-39
Keywords : MANET; data caching; pull-based; TTL; PSO;
In MANET environments, data caching is essential because it increases the ability of mobile devices to access desired data, and to improve overall system performance. We propose a distributed cache invalidation mechanism (DCIM), which is client based cache consistency scheme that's enforced on prime of an antecedently proposed design for caching information things in mobile ad hoc networks (MANETs), specifically COACS, wherever special nodes cache the queries and also the addresses of the nodes that store the responses to those queries. We’ve additionally antecedently proposed a server-based consistency theme, whereas in this paper, we tend to introduce DCIM that's entirely client-based. DCIM could be a pull-based algorithm that implements adaptive time to live (TTL), piggybacking, and prefetching, and provides close to robust consistency capabilities. Cached information things are assigned adaptive TTL values that correspond to their update rates at the info source, wherever things with expired TTL values are classified in validation requests to the info source to refresh them, whereas valid ones however with high request rates are prefetched from the server. During this paper, DCIM is analyzed to assess the delay and information measure gains (or costs) compared to polling on every occasion and push-based schemes. To reduce the delay time we propose a selection based PSO algorithm for elect the Query Director (QD). DCIM was additionally enforced using ns2, and compared against client-based and server-based schemes to assess its performance through an experiment. The consistency quantitative relation, delay, and overhead traffic are according versus many variables, where DCIM showed better result by using PSO algorithm.
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Last modified: 2014-06-19 16:40:26