Double-layer distributed caching method for fog wireless access network

A distributed cache and wireless access network technology, applied in the transmission system, electrical components, etc., can solve the problems of low latency, high latency, and failure to meet 5G requirements, and achieve reduced download latency, low complexity, and high robustness sexual effect

Active Publication Date: 2020-06-16
SOUTHEAST UNIV
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Problems solved by technology

[0003] However, the existing communication network architecture does not meet the requirements of 5G. Moreover, with the arrival of the 5G / B5G era, the amount of files in the network will increase greatly, and the requirements for low latency will be higher

Method used

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  • Double-layer distributed caching method for fog wireless access network
  • Double-layer distributed caching method for fog wireless access network
  • Double-layer distributed caching method for fog wireless access network

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Embodiment 1

[0044] Such as figure 1 As shown, a double-layer distributed caching method for a fog wireless access network in this implementation includes the following steps:

[0045] (1) Divide the fog network into F-AP layer and UE layer. D2D communication can be carried out between UEs covered by the same F-AP. Each UE preferentially applies for a file from a neighboring UE. If the neighboring UE does not cache the file, it applies to the F-AP.

[0046] (2) Then, each UE determines the popularity of a certain file according to local information, and the process is as follows:

[0047]

[0048] where P nk for file f n at UEu k popularity around, t nk For neighboring devices to u k request file f n times.

[0049] At the same time, each F-AP records the number of times UEs within its coverage area apply for files, and similarly obtains the popularity of files in the F-AP layer.

[0050] (3) According to the popularity of the file obtained in (2), the UE layer cache distribution...

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Abstract

The invention discloses a double-layer distributed caching method of a fog wireless access network, which comprises the following steps in turn: dividing the fog network into an F-AP (fog wireless access node) layer and a UE (user equipment) layer; each F-AP Both AP and UE collect file application information from surrounding UEs, and calculate file popularity based on these information; use the knapsack algorithm to find the optimal cache distribution for the UE layer; use the BP algorithm to find the optimal cache distribution for the F-AP layer; The UE determines the UE with which to establish the D2D connection by inquiring whether the surrounding UEs are receiving the file. The present invention implements double-layer caching by introducing D2D connections into the fog network, and adopts a distributed method so that each F-AP and UE only needs to collect local information to make caching decisions. Compared with the traditional caching algorithm, the downloading delay is significantly reduced, and the present invention is kept to complete convergence within ten iterations, the complexity is low, and at the same time, it has higher robustness.

Description

technical field [0001] The invention relates to a cache technology, in particular to a double-layer distributed cache method for a fog wireless access network. Background technique [0002] At present, in order to provide wireless users with a low-latency download experience, people's research on cache layout in wireless communication systems is mainly concentrated on existing architectures such as CRAN, and the research on single-layer centralized cache layout at the BS layer is the main research. [0003] However, the existing communication network architecture does not meet the requirements of 5G. Moreover, with the advent of the 5G / B5G era, the amount of files in the network will increase greatly, and the requirements for low latency will be higher. Therefore, finding a low-latency cache placement strategy suitable for 5G / B5G architecture is an urgent problem to be solved. Contents of the invention [0004] Purpose of the invention: The purpose of the present inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/08
CPCH04L67/06H04L67/10H04L67/568
Inventor 夏骋宇蒋雁翔
Owner SOUTHEAST UNIV
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