A d2d-based network edge caching method and system

Abstract

The invention discloses a D2D (Device-to-Device)-based network edge caching method and system, which belong to the technical field of wireless communication. The method is applied to a communication network formed by a base station providing control coverage and a plurality of pieces of user equipment in the coverage range, positions of the user equipment obey Poisson point distribution, and the cached content can be shared among adjacent user equipment in the D2D transmission range. In the network edge caching method disclosed in the invention, a content random caching strategy is made through joint optimization on truncation points truncating Zipf distribution and exponents, and the network edge caching hit rate is improved. In order to find out optimal Zipf distribution truncation points and exponents, a global optimal genetic algorithm and a sub-optimal step-by-step optimization algorithm are used respectively. The advantages of D2D transmission and distributed random caching are made full use of, and through joint optimization on content truncation points and exponents for caching Zipf distribution, the content caching hit rate of the network edge can be improved significantly.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and more specifically, relates to a D2D-based network edge caching method and system. Background technique [0002] Caching is a content storage technology that "exchanges storage for bandwidth". In wireless communication networks, content with high popularity is usually stored in a cache node (such as user equipment) close to the user to reduce requests from users for remote content. The probability of repeatedly calling and transmitting the same content in the provider improves the local cache hit rate, thereby effectively reducing the delay in obtaining content, reducing transmission overhead, and alleviating the transmission bottleneck of the backhaul network. [0003] The Cisco Visual Networking Index pointed out that video content business occupies a dominant position in the communication field business. Studies have shown that the popularity of video content obeys t...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a D2D-based network edge caching method and system, thereby solving the problem of D2D communication opportunities between user equipments in the existing D2D communication where user equipment caching policies exist. less, and the technical problem of low utilization of the cache space of the user equipment due to the low average local cache hit rate at the user equipment

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