Cache optimization decision method of super-dense cellular and D2D heterogeneous converged network

Abstract

The invention provides a cache optimization decision method of a super-dense cellular and D2D heterogeneous converged network. The method comprises the following steps: constructing cellular and D2D heterogeneous converged network architecture; predicting popularity of networked multimedia content; establishing a D2D resource sharing network when receiving a broadcast message by a smart terminal;performing collaborative caching on the accessed multimedia content by each user smart terminal; predicting the cached content obtainable probability of each user smart terminal in a cellular base station by the user smart terminal; counting the content transmission delay in the cellular and D2D heterogeneous converged network through the cellular base station, wherein a service gateway performs cache optimization on the base station by taking the minimum content transmission delay as the target according to the counted content transmission delay in the cellular and D2D heterogeneous convergednetwork, thereby obtaining the final optimization decision of the cellular and D2D heterogeneous converged network. Through the method provided by the invention, a content demand feedback mechanism is added between the terminal and the base station, and the interlayer cache redundancy of the D2D network and cellular network is further reduced.

Description

technical field [0001] The invention belongs to the technical field of ultra-density heterogeneous wireless communication networks, and specifically relates to an ultra-density cellular and D2D heterogeneous fusion network cache optimization decision-making method. Background technique [0002] With the rapid development of wireless communication technology, ubiquitous handheld smartphones and tablets access the Internet through mobile networks, triggering an explosive demand for video / audio streaming. This puts enormous pressure on current mobile networks. According to statistics, most of the traffic load in the network is caused by repeated transmission of some hot content. Caching the hotspot content at a local node, such as a cellular base station (Base Station, BS) or a mobile terminal device (Device), can effectively alleviate the network load. Especially designing an efficient content caching mechanism in a high-density heterogeneous network environment where Device...

AI Technical Summary

Problems solved by technology

However, in high-density D2D user scenarios, due to the short distance between users with caching capabilities, this strategy will generate a large amount of content redundancy in locally adjacent terminal devices, resulting in low utilization of terminal storage space.

In the cellular network, there is a lack of cache data sharing between base stations, resulting in a low degree of cache coordination and large cache redundancy between base stations.

Especially in the co-coverage environment of cellular and D2D networks, there is a lack of caching cross-layer cooperation between base stations and D2D devices, resulting in insufficient utilization of the entire network storage space

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