cache node selection method based on D2D communication

A technology for caching nodes and communication distance, applied in the field of communication, can solve the problems of heavy load of wireless network, increase the burden of base station, high cost, etc., achieve the effect of reducing the total system cost, saving system overhead, and realizing the total system cost

Active Publication Date: 2019-05-24
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] With the rapid development of smart devices and the continuous emergence of various multimedia applications, mobile users can enjoy a variety of service experiences through wireless networks, but at the same time it will also cause huge traffic
It is expected that the demand for cellular network bandwidth will increase exponentially in the next few years, which will undoubtedly bring a heavy load to the existing wireless network, especially the burden on the base station, and even lead to system congestion and performance degradation
Although the traffic burden can be reduced by widely erecting base stations, this solution requires a lot of cost, and the speed of traffic growth is much faster than the speed of base station deployment

Method used

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  • cache node selection method based on D2D communication
  • cache node selection method based on D2D communication
  • cache node selection method based on D2D communication

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Embodiment Construction

[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0031] Such as figure 1 and Figure 5 As shown, the present invention provides a caching node selection method based on D2D communication, including the following steps:

[0032] S1: User requests file content:

[0033] In this embodiment, N users are randomly distributed in the community, and users can request some files according to their own needs. Assuming that the size of each requested file is the same, the number of files requested by each user at a certain moment is expressed as The file requested by each user at a certain moment can be expressed as F={f 1 , f 2 , f i ,L,f N}, where f i Indicates that the i-th user requests files.

[0034] S2: Construct an optimization function aiming at minimizing the total system cost:

[0035] The objective function of the optimization function is:

[0036]

[0037] s.t.s i ={0,1},s ...

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Abstract

The invention discloses a cache node selection method based on D2D communication. The method comprises the following steps: firstly, counting a user set satisfying a D2D communication distance aroundeach user; and then calculating a judgment factor of each user, selecting the user with the maximum judgment factor as a cache node, removing the user set which satisfies the D2D communication distance between the node and the periphery of the node, performing second round of cache node selection on the rest users, and terminating iteration until all the users determine a file acquisition mode. According to the invention, the caching technology and the D2D communication technology are combined, the system cost function is established on the premise of ensuring that all users in the system obtain the required files, and the strategy of obtaining the files by the users in the system cost function is optimized, so that the minimization of the total cost of the system is realized, and the application prospect is very good.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for selecting a cache node based on D2D communication. Background technique [0002] With the rapid development of smart devices and the continuous emergence of various multimedia applications, mobile users can enjoy rich and diverse service experiences through wireless networks, but at the same time it will also cause huge traffic. It is expected that the demand for cellular network bandwidth will increase exponentially in the next few years, which will undoubtedly bring a heavy load to the existing wireless network, especially the burden on the base station, and even lead to system congestion and performance degradation. Although the traffic burden can be reduced by widely erecting base stations, this solution requires a lot of cost, and the speed of traffic growth is much faster than the speed of base station deployment. Therefore, under the premise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/70H04W28/14
Inventor 朱琦陶静朱洪波杨龙祥
Owner NANJING UNIV OF POSTS & TELECOMM
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