A Method of Joint Dynamic Access and Subcarrier Allocation Based on Cache in Ultra-dense Network

Abstract

The invention discloses a method for combining dynamic access and subcarrier allocation under a cache-based ultra-dense network. The method comprises the following specific steps that firstly, multiple users simultaneously send request information to all access points to search a caching content; secondly, each access point judges whether a caching content requested by the current user K exists, all access points meeting the user K transmit respective property parameters to local control, and the local control allocates the optimal access point to the user K, otherwise the user K directly sends a request to a remote server to obtain the content; thirdly, the remote server utilizes popularity analysis to complete cache updating according to the user request information; and lastly, after each user is matched with the respective access point, subcarrier allocation is carried out, so that each user is communicated with the respective access point. The method has the following advantages that multiple factors are synthesized to complete access selection, and promotion of the resource management efficiency and dynamic allocation of the subcarrier are realized, so that the spectral efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of networking and resource allocation, and specifically refers to a method for joint dynamic access and subcarrier allocation in a buffer-based ultra-dense network. Background technique [0002] The ultra-dense network is a strong candidate technology for 5G. The ultra-dense networking technology can greatly improve the frequency reuse efficiency by increasing the deployment density of base stations, greatly improve the system capacity, and meet the demand for 5G capacity growth of a thousand times. However, the increasingly dense network deployment makes the network topology more complicated. While the existing content distribution mechanism realizes the transmission of massive information such as pictures, audio, and video, there is a large amount of repeated transmission of content, which causes a great waste of spectrum resources. . In response to this problem, the caching technology is introduced into ...

AI Technical Summary

Problems solved by technology

[0003] Under the cache-based dense network, Literature 1: A throughput gain optimization method based on physical layer cache in a dense wireless network with limited backhaul links, proposes a new cache wireless network architecture based on backhaul links, And under this architecture, a physical layer caching scheme is proposed to improve system throughput, but this scheme only considers factors such as the backhaul link, and shows that the result is related to the cache capacity of the base station

[0004] Document 2: A joint routing and content cache optimization method in a heterogeneous network, using a joint routing selection and cache allocation scheme to optimize resource allocation. The problem considered in this scheme is single, and resource utilization such as frequency efficiency and energy efficiency are not considered. question

[0005] In ultra-dense scenarios, the existing technology does not consider the load balancing of access points, and dynamically selects access points

In addition, the optimization of spectrum efficiency is not considered, and the allocation of resources such as subcarriers is optimized

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