Research On Cooperative Cache In Opportunistic Networks

Opportunity to network is a need not exist between the source node and thedestination node complete communications link, use the opportunity to meet themobile node to achieve self-organization brings network data communications. As thenetwork has the chance node greater mobility, extending data, limited resources, etc.,how rational and efficient use of the cache node provides resources to increasecollaboration between the nodes to reduce the chance of network latency, conservebandwidth, to prevent congestion, and ultimately sharing of resources is a key issue.In this paper, the opportunity to network with limited buffer space issues,in-depth study of the characteristics of human mobility model of nodes in the state ofmotion relative to a stationary state with the proposed cooperative caching strategiesbased on human mobility model, the strategic use of the target address matchingcriteria to strict select the cooperative caching node and synchronous cache datalocally within the cache table to achieve the purpose of sharing information in order totake full advantage of each mobile node limited cache resources, improve the datacache hit rate. Because there will be cases of cache space is full or outdated data, thispaper proposes cache replacement strategy based on ant colony algorithm, the policyreference for solving0/1knapsack problem ant colony algorithm model, combinedwith ant colony algorithm pheromone size, according to the data object pheromoneselected data object does not replace the selected data object from the cache.Through simulation experiments and the results analyzed to verify thecooperative caching strategies and cache effectiveness of the proposed replacementpolicy, promoting collaboration between nodes, reducing end to end delay andnetwork overhead.