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
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[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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