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Cache replica layout method in D2D network

A caching, replicating technology used in network planning, machine-to-machine/machine-type communication services, electrical components, etc.

Active Publication Date: 2019-07-26
CHONGQING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology

[0003] As far as D2D cache network technology is concerned, many current studies have considered the characteristics of mobility, spatial randomness, and social relations between D2D users, and used stochastic geometry theory to establish a dynamic terminal dynamic topology model, and optimize the cache network on this basis. structure and update the cache management strategy to improve the network cache success rate and system performance. However, there is still a gap in the research on the number of D2D cache copies.

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  • Cache replica layout method in D2D network
  • Cache replica layout method in D2D network
  • Cache replica layout method in D2D network

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Embodiment Construction

[0076] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0077] The technical method that the present invention solves the problems of the technologies described above is:

[0078] Such as figure 1 Shown: Consider a D2D cache network, where the locations of all users in the network obey a homogeneous Poisson point process with a density of λ, and all D2D end devices (DUEs) have the same cache function and storage space.

[0079] In this model, the communication and effective buffer transmission distance between DUEs are both R, and there will be no link conflict due to co-channel interference during transmission. Assuming that the total number of files in the entire cache network is N, and each file has the same size, setting a single DUE will not repeatedly c...

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Abstract

The invention requests to protect a cache replica layout method in a D2D network. The method comprises the following steps: for a D2D cache network replica layout problem, firstly obtaining a popularity rank of cache files in a cell, and simulating a file request model by utilizing zipf distribution; secondly, analyzing and designing a system cache hit rate model according to the file request model; and finally, taking system cache hit maximization as an objective function, solving the objective function by utilizing a Lambert multiplier method and a dichotomy, and obtaining a cache copy number layout method. The cache hit maximization of the system can be realized by utilizing the arrangement of the number of cache file copies in the D2D network.

Description

technical field [0001] The invention belongs to the technical field of D2D caching, and specifically relates to a method for arranging the number of cache copies with the goal of maximizing the system cache hit rate. Background technique [0002] With the exponential growth of wireless network data traffic, D2D (Device-to-Device) communication technology has gained great attention in order to meet the communication requirements of high transmission rate and low user-side delay in the next generation network. D2D is the terminal direct transmission technology, which can enable the two devices to communicate directly without the base station, and use the D2D terminal devices scattered in the network to buffer resources, which can reduce the traffic pressure of the base station, reduce the transmission delay of the user side, and improve the system throughput and user experience. [0003] As far as D2D cache network technology is concerned, many current studies have considered...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/70H04W16/18H04W24/02
CPCH04W4/70H04W16/18H04W24/02
Inventor 文凯谭笑廖新平
Owner CHONGQING UNIV OF POSTS & TELECOMM
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