Video service classification buffer method based on user mobility in ultra-dense heterogeneous network

Abstract

The invention relates to a video service classification buffer method based on user mobility in an ultra-dense heterogeneous network. The method belongs to the technical field of wireless communication. The method divides the buffer space of each small base station into two regions to respectively provide common network video and typical streaming media video for users, and adopts different bufferstrategies for two different types of video service services. For the common network video, the caching problem is described as an optimization problem to minimize the average transmission cost of the cached content by using the encoding caching and delayed offload strategy. For a typical streaming video, uncoded video segments of the requested video are pre-positioned in a small base station through which the user passes with a high probability. The invention can remarkably reduce the average transmission cost of the buffer content and greatly reduce the traffic in the backhaul network. In addition, the designed caching strategy takes into account the mobility of the user and the time limit of the connection between the user and the small base station, which is more in line with the actual network scenario.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a video service classification caching method based on user mobility in an ultra-dense heterogeneous network. Background technique [0002] With the popularization of smart terminals and the diversification of multimedia applications, mobile data traffic has shown unprecedented growth worldwide. This rapid increase in traffic in mobile networks will result in higher transmission delays and energy consumption. The rapidly increasing demand of users is pushing wireless communication technology to approach its limits in terms of capacity and coverage. In order to cope with this severe challenge, researchers have proposed to deploy small cell base stations SBSs that can work with traditional macro cell base stations MBSs in existing networks to increase network capacity. However, the overloaded and expensive backhaul link connecting SBSs and the core network ha...

AI Technical Summary

Problems solved by technology

The existing technology assumes that once a user establishes a connection with a small cell, all data of the requested content can be downloaded from the cache of the associated small cell, which is unreasonable

Literature [3] introduced the delayed unloading technology into the cache for the first time, but it did not analyze the validity period of the user request

In addition, the existing technology does not consider the impact of different video services on caching strategies. Different types of multimedia applications on user terminals have different requirements for cached content.

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