Small cell network edge partial caching method taking user time delay into consideration

A user delay and network edge technology, applied in the field of wireless communication, can solve the problem that the edge cache efficiency is not in the best state, the cache scheme does not give the cache percentage, and the file size is not considered, etc., to ensure the access delay. , the effect of improving utilization and relieving bandwidth pressure

Active Publication Date: 2018-04-06
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] To sum up, in the existing technology, on the one hand, the existing edge cache research does not consider the situation of different file sizes

Method used

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  • Small cell network edge partial caching method taking user time delay into consideration
  • Small cell network edge partial caching method taking user time delay into consideration
  • Small cell network edge partial caching method taking user time delay into consideration

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Embodiment Construction

[0046] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0047] Under the model of the small cell network system, the present invention abandons the traditional process of equalizing the size of all files to be cached, but randomizes the file size, and determines the cache file candidate set of the small cell base station according to the popularity of the video file. The different characteristics of the file size and the delay sensitivity of the user to the video file have an important impact on the effectiveness of the cache; through the simulation, it is found that due to the random distribution of the file size, there are large differences in the cache space occupied by files with different popularity. To ensure the maximization of cache efficiency and obtain the maximum cache efficiency with the minimum cache space, the maximum inter-class variance method in the image field is introduced to obtain the o...

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Abstract

The invention discloses a small cell network edge partial caching method taking user time delay into consideration and belongs to the technical field of wireless communication. The method comprises the steps that a caching video file alternative set is rearranged according to popularity and corresponding popularity values and corresponding video file sizes are acquired; the maximum number K of thevideo files capable of being completely cached is calculated; iteration is carried out through utilization of a maximum between-class variance method according to the maximum number K, complete caching is carried out on the video files of which total size is smaller than or equal to a caching threshold Sc, and partial caching is carried out on the video files of which total size is greater than the caching threshold Sc; when a user initiates a content request to a small cell base station, if the video files are cached completely, the user acquires complete content from the small cell base station and finishes the process; and if the video files are partially cached or are not cached, content is requested from a content server of a core network through a backhaul link. According to the method, the access time delay of the user can be ensured, a cache hit rate can be improved, a utilization rate of a caching space of a small base station can be improved, and the bandwidth pressure of the backhaul link can be effectively mitigated.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a small cell network edge buffer method considering user time delay. Background technique [0002] According to Cisco's white paper, mobile data flow will account for about 75% of global data traffic in 2019, and most of mobile data flow is borne by video traffic. With the globalization of smart terminals and the continuous development of self-media In this environment, network video traffic will show an exponential growth trend. Today's macro cellular network capacity can no longer be further expanded to meet the growing traffic demand. [0003] In order to solve this problem, a small cell (Small Cell) network is introduced. Under the coverage of the macro cellular network, through the dense deployment of small cell base stations, the system capacity is greatly improved and the traffic demand on the network is alleviated. However, the weak backhaul links of smal...

Claims

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Application Information

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IPC IPC(8): H04W28/02H04W28/06H04N21/433H04L29/08
CPCH04N21/433H04W28/0278H04W28/06H04L67/568
Inventor 张鹤立刘洪燕李曦纪红
Owner BEIJING UNIV OF POSTS & TELECOMM
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