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A Partial Buffering Method at the Edge of Small Cell Network Considering User Latency

A technology of user delay and network edge, which is applied in the field of wireless communication, can solve problems such as not considering file sizes, cache scheme does not give cache percentage, and edge cache efficiency is not optimal, so as to ensure access delay , improve utilization, and relieve bandwidth pressure

Active Publication Date: 2020-03-17
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; on the other hand, the existing partial cache scheme does not give the best cache percentage, so the benefits of edge cache are not. achieve the best

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  • A Partial Buffering Method at the Edge of Small Cell Network Considering User Latency

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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 caching method for the edge part of a small cell network considering user time delay, and belongs to the technical field of wireless communication. First, rearrange the candidate set of cached video files according to their popularity, and obtain the corresponding popularity value and the corresponding video file size; then, calculate the maximum number K of video files that can be completely cached; use the largest category according to the maximum number K Between the variance method to iterate, for less than or equal to the cache threshold S c The video files are fully cached, and the video files larger than the cache threshold S c Partial cache of the video file; when the user initiates a content request to the small cell base station, if the video file is completely cached, the user obtains the complete content from the small cell base station and ends; if it is partially cached or not cached, the backhaul link Content is requested from a content server in the core network. The invention can ensure the user's access time delay, improve the cache hit rate, improve the utilization rate of the cache space of the small base station, and effectively alleviate the bandwidth pressure of the backhaul link.

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...

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Application Information

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Patent Type & Authority Patents(China)
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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