Available bandwidth adaptive video fragmentation request method supporting QoE maximization

Abstract

The invention discloses an available bandwidth adaptive video fragmentation request method supporting QoE maximization, and relates to the technical field of adaptive video transmission. The availablebandwidth adaptive video fragmentation request method provided by the invention comprises available bandwidth estimation and fragmentation code rate selection, the available bandwidth estimation comprises: dividing bandwidth fluctuation into slight fluctuation and severe fluctuation according to the severity of the variation of the bandwidth amplitude, and estimating the available bandwidths during the next fragmentation transmission for the slight fluctuation and the severe fluctuation by adopting different historical weighting methods; and the fragmentation code rate selection comprises: setting constraint conditions of avoiding cache underflow, cache overflow and invalid downloading according to the limitation of the cache and the estimated available bandwidth, expressing the fragmentation code rate selection as a QoE function, and requesting a video fragmentation that can maximize the QoE function. By adoption of the available bandwidth adaptive video fragmentation request methodprovided by the invention, the accuracy of bandwidth estimation is improved, the adaptive matching of a fragmentation request with the network bandwidth and the cache level is implemented, the video playing interruption times of the client are reduced, the cache level is improved, and the user experience quality is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of video adaptive transmission, and more specifically relates to a method for requesting available bandwidth adaptive video slices that supports QoE maximization. Background technique [0002] With the rapid development of wireless communication technology, video services have become a mainstream service in the Internet. In practical applications, due to the influence of factors such as user location movement, channel attenuation, and wireless interference, mobile network bandwidth has time-varying characteristics. This kind of fluctuation will directly affect the video transmission, and then affect the playback effect; in addition, there are differences in device performance and resolution among various terminals. Due to the above reasons, the user's viewing experience will be affected by network bandwidth and terminal performance. Therefore, in order to improve Quality of Experience (QoE, Quality o...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the problem that the existing video fragmentation method does not consider how to realize the matching of fragmentation requests, network bandwidth and cache level from the perspective of user quality of experience, which makes it difficult to provide users with the best quality of experience. The present invention provides an available bandwidth adaptive video fragmentation request method that supports QoE maximization. On the basis of accurately estimating changes in bandwidth, the fragmentation request is adaptively matched with the network environment and cache conditions to maximize client QoE. As the goal, optimize the viewing effect of users

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