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Joint Optimization Method of Content Caching and User Association in Heterogeneous Cellular Networks

A technology of content caching and cellular network, applied in the field of mobile communication, can solve problems such as inability to accurately predict the probability of content requested by a single user, and not optimal matching

Active Publication Date: 2020-11-10
CHONGQING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The paper "Wang Y, Tao X, Zhang X, et al. "Joint CachingPlacement and User Association for Minimizing User Download Delay," IEEE Access, 2016:8625-8633." considers wired links when jointly designing caching and user association strategies The difference between the channel quality of the wireless link and the channel quality of the backhaul link is studied, but the Hungarian algorithm used in the user association strategy in this paper can only obtain the maximum matching between the user and the base station, not the optimal matching
Current research is to determine the content cache by predicting the probability of user requesting content, but in fact, due to the uncertainty of user request content and associated base stations, it is impossible to accurately predict the probability of a single user request content

Method used

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  • Joint Optimization Method of Content Caching and User Association in Heterogeneous Cellular Networks

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Embodiment 1

[0066] established as figure 2 The two-layer heterogeneous cellular network content service model shown includes a macro base station MBS and N home base stations FBS, and the set of base stations is F={f 0 ,f 1 ,f 2 ,..., f N}, where f 0 Indicates MBS; f 1 ,f 2 ,..., f N represent N FBSs respectively. Let the number of users be M, and the set of users is expressed as U={u 1 ,u 2 ,...,u M}. let f n The available bandwidth of ∈F is B n , the available bandwidth is divided into I n subcarriers, that is, an f n The maximum number of users that can be served at the same time is I n , then the bandwidth b of each subcarriern =B n / I n . It is assumed that subcarriers in each base station and between base stations are mutually orthogonal, and inter-channel interference is not considered. Due to the overlapping coverage between base stations, a user may have one MBS and multiple candidate FBSs to choose from when accessing the network, but is only associated with ...

Embodiment 2

[0099] On the basis of Embodiment 1, the content caching strategy remains unchanged, and step S41 is changed to: step S42, when the user association method adopted is a delayed association method, when the user's request for content in the i-th cycle arrives, let the user Wait for a short time τ m , associating to the base station together with the user arriving later; specifically include: remaining steps remain unchanged, embodiment 2 adopts delay association (Joint optimize content caching and user association with waiting association, JCCA-WA) strategy construction:

[0100] When the user request arrives, let the user wait for a short time τ m , associate with the users who arrive later, and convert the problem of minimizing the average delay of users to obtain content into the problem of solving the optimal matching problem of the bipartite graph between users and base stations. Define weighted undirected bipartite graph G=(F, U, E), two vertex sets F={f of weighted undi...

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Abstract

The invention belongs to the field of mobile communication, and relates to a joint optimization method for content caching and user association in a heterogeneous cellular network, including: according to the limitation of base station storage capacity and the number of service users, aiming at minimizing the average time delay for users to obtain content , establish a joint optimization model associated with content cache and users and a joint objective function; predict the access frequency of content on the base station in the next cycle through the triple exponential smoothing method according to the joint objective function, and determine the content cache; take different measures according to whether the user arrives intensively The association method is to associate the user with a suitable base station; if the user arrives densely, the delay association method is adopted, otherwise the instant association method is adopted. The present invention can guarantee the service quality of the user through the above two association methods.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a joint optimization method for content cache and user association in a heterogeneous cellular network. Background technique [0002] With the rapid growth of the number of mobile users, mobile links, and mobile services, by 2019, the growth rate of global mobile traffic will exceed three times that of fixed traffic, and mobile video will account for 72% of global mobile data traffic. The rapid growth of mobile services has brought great challenges to the system and architecture of existing communication networks. [0003] In dense urban areas with network overload, especially in residential areas with complex residential buildings and concentrated users, the indoor signal coverage is poor due to the loss caused by walls, resulting in a serious lack of signal coverage depth, and it is difficult to build a site, and the expansion cost is expensive. , which brings a gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/08H04W28/02H04W24/02
CPCH04W24/02H04W28/02H04W28/0278H04L67/568
Inventor 王蕾李云吴广富黄巍
Owner CHONGQING UNIV OF POSTS & TELECOMM