Named data network caching method, buffer and storage medium

Abstract

The invention relates to a named data network caching method, a buffer and a storage medium. The named data network caching method comprises the following steps: judging the state of a node; accordingto the state of the node and a to-be-determined interest table, obtaining the preference degree of the node for a classification interest packet; obtaining the local popularity of the classificationdata packet according to the to-be-determined interest table; calculating and obtaining a caching probability according to the preference degree and the local popularity; comparing the caching probability with a caching probability threshold value, and determining whether to cache or not. The invention also discloses a named data network buffer and a storage medium. According to the invention, thespatio-temporal characteristic of the data packet is utilized by judging the state of the node; andwhen whether to cache the data packet is determined, the user preference and the local popularity ofthe data packet are comprehensively considered, more effective data contents in the network is cached, a better cache space utilization rate is obtained, the data redundancy is reduced, the data hitrate is improved, and the average hop count and the time delay are reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a named data network caching method, cache and storage medium based on data spatiotemporal characteristics. Background technique [0002] Named Data Network (NDN) uses content names to replace the "thin waist" IP in the existing Internet TCP / IP hourglass model, so that content names are used as the basis for content acquisition, query, forwarding and routing. There are two data structures in NDN: Interest packets and Data packets. The interest packet has four fields of content name, selector and random number, and the data packet has four fields of content name, signature, signature information and content. NDN ensures the security of the content by signing each data packet. The interest packet is initiated by the content requester to obtain content, and the content provider replies with a data packet as a response to the interest packet. NDN contains three d...

AI Technical Summary

Problems solved by technology

[0006] The above methods decide whether to cache the data based on the similarity and popularity of the data respectively, without considering that in the vehicular ad hoc network, the distribution of data packets will change with the change of time and space. The demand will be greater. If all the information is cached when the data packet is cached, there will be problems such as long information cache delay time and high packet loss rate.

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