Online collaborative caching method based on optimized energy efficiency

Abstract

The invention discloses an online collaborative caching method based on optimized energy efficiency, which belongs to the technical field of communication and comprises the following steps of firstly,establishing a double-layer heterogeneous ultra-dense network scene comprising a content server CP, a macro base station MBS, a small base station SBS and user UE; aiming at the new content l to becached, enabling an MBS to calculate a preference factor and a social factor of a certain user UE for the content; further obtaining a preference factor and a social factor of each piece of UE on thecontent, calculating a decision function value by combining the current heat factor of the content l, adding the content l into the cache file set when the decision function value l is greater than orequal to a judgment threshold I0, and meanwhile, calculating each SBS capable of caching the content by MBS; judging whether each SBS needing to cache the content l and the MBS have enough cache space or not, and if so, directly caching the content l; otherwise, deleting from the most recently requested file until the cache space is sufficient to store the content l. According to the invention, the real-time distribution of the cache content can be realized, the energy consumption is saved, and the network cost is saved.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to an online cooperative caching method based on optimizing energy efficiency. Background technique [0002] Ultra-dense network UDN (ultra-dense network) is a strong candidate technology for 5G (the fifith generation mobile network). Ultra-dense networking technology can greatly improve the efficiency of frequency reuse by increasing the deployment density of base stations. Greatly increase system capacity. In addition, deploying cache at the edge of the network is also a recognized technology in 5G network research that can improve network performance. The edge cache can effectively offload the transmission load of the backhaul link, thereby reducing the delay of file distribution to end users and saving energy consumption during file transmission. Successful cache content decisions and location assignments can greatly improve network performance. Therefore, in order to e...

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Problems solved by technology

[0004] In the research of ultra-dense network edge caching technology, although there have been researches on online caching, the existing online caching research has not considered the impact of local user behavior on the cache hit rate.

In addition, the existing research on online caching also lacks the consideration of energy efficiency optimization

[0005] A large number of edge access nodes in an ultra-dense network will make the backhaul link a bottleneck problem in the ultra-dense network, and a large part of the massive information transmitted in the network is repeated transmission, such as popular audio and video, hot social network content, etc. The transmission of these duplicate content occupies a large amount of network resources, increasing network consumption and burden

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