Content-Centric Mobile Ad Hoc Network Caching Method Based on Double Threshold Judgment

Abstract

The invention discloses a content center mobile self-organizing network caching method based on dual threshold decision. The method comprises steps that 1), two fields are added to an undetermined request table PIT; frequency p and response time delay t are retrieved, and a retrieval frequency threshold p0 and a response time delay threshold t0 are set; 2), after a node receives a returned data packet, whether a content cache CS is stored with the content of the returned data packet is firstly checked, if yes, the data packet is dumped; if not, present retrieval frequency p is checked, if the p is lower than the p0, retrieval frequency is proved to be quite low, and no caching is carried out; otherwise, the response time delay t is compared with the t0, if the response time delay t is smaller than the t0, the content is proved to be stored by a nearby node, no caching is carried out, otherwise, the content is cached. Through the method, caching resources and caching energy can be saved, hot spot content can be cached with priority, content response time delay under the condition of a caching duplicate is reduced, and content retrieval efficiency is guaranteed.

Description

technical field [0001] The invention relates to the technical field of wireless communication networks, and to a cache technology in a content-centric mobile ad hoc network, in particular to a content-centric mobile ad hoc network caching method based on double threshold judgment. Background technique [0002] Content Centric MANET (CCMANET) is a new type of mobile ad hoc network (MobileAd Hoc Network, MANET) formed by applying the content-centric ideas in Content Centric Network (CCN) to Mobile Ad Hoc Network (MANET). Network Architecture. In CCMANET, when a requesting node needs a certain content data, it will broadcast an Interest Packet to the surrounding neighbor nodes. When a node receives the Interest Packet, it first checks whether the local cache has the requested data. If the cache has the data, it will be directly returned to the requesting node; otherwise, the user request will be forwarded to the next hop node until it reaches a node that caches the requested c...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a caching strategy for CCMANET to improve the overall performance of the network. By setting the retrieval frequency threshold and response time threshold for the requested content, the strategy makes caching decision-making associated with content popularity and response time, and caches popularity first. Content with high content and long response time, thereby avoiding the problems of large cache energy consumption, cache resource shortage, and retrieval privacy leakage caused by hop-by-hop cache, and at the same time overcome the long response time of the interval cache strategy of selective cache based on distance judgment , high energy consumption for service forwarding, network congestion and other shortcomings

Images