Abstract
The caching paradigm has widely been used in computers, data bases and the Internet to reduce the response time of the applications and to reduce the traffic load in the computer buses or in the networks. These advantages can also be applied in a Mobile Ad Hoc Network (MANET) as the caching paradigm could reduce the interferences due to the traffic overload and it could also increase the availability of the documents due to server disconnections. In this article, we propose a cooperative caching scheme for MANETs. The proposal is supported by the local cache that all the nodes in the MANET possess. In a collaborative way, a node could respond to the demand of other nodes if it is keeping a valid copy of the required document. As a novelty, the demands of the documents are not restricted to specific application messages but they are codified into the messages generated when the path to the server is being searched. In this way, the documents can be retrieved even when there is no route to the server. Furthermore, these expanded messages provide useful information about potential localizations of the documents. The proposed technique will use those additional location data to redirect the requests. By means of simulations, we have evaluated and compared our proposal to five other caching schemes as well as with the option of no caching. The obtained results indicate that our proposal outperforms the others in terms of document accessibility, delay and generated traffic load.
Highlights
Wireless technologies are present in our daily lives
In order to consider the eviction of documents in the local caches, we propose to set as the validity time for the redirection information the minimum between the document TTL and the mean time that the documents stay stored in the local cache
The scheme is proposed to improve the retrieval of information in Mobile Ad hoc Network (MANET)
Summary
Wireless technologies are present in our daily lives. It is common to come across home appliances, mobile phones, personal digital assistants, electronic pads and tablets or laptops provided with one or more built-in radio interfaces. A cooperative caching scheme is expected to increase the accessibility to the documents in the MANET It aims at moderating the energy consumption in the mobile nodes (MN) by reducing the traffic across the network. In the MobEye caching scheme, when a MN needs a document not stored in its local cache, a request is broadcast to the entire network. SimpleSearch implements an admission control policy that only allows to store the documents in the local cache if they were served by a node that is located from a minimum number of hops away. COOPerative (COOP) performs an adaptive flooding broadcast to search for the documents in the network According to this scheme, any MN has to maintain a Recent Request Table (RRT) where they store information about the source (and its corresponding distance in hops) of the requests that the node forwards. This enhancement proposes that the server decides which nodes in the response path have to store the document instead of leaving this decision to each node
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