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A cross-layer joint video transmission method and system based on encoding and caching

A video transmission and encoding technology, applied in image communication, selective content distribution, electrical components, etc., to reduce transmission delay and improve video experience quality

Active Publication Date: 2022-02-22
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of secure video transmission through the backhaul link in the above-mentioned cloud-edge collaborative network, and propose a video transmission method and system based on cross-layer joint encoding and caching. Improve the quality of video experience and reduce transmission delay under safe conditions

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  • A cross-layer joint video transmission method and system based on encoding and caching
  • A cross-layer joint video transmission method and system based on encoding and caching
  • A cross-layer joint video transmission method and system based on encoding and caching

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Embodiment Construction

[0054] The present invention is described in further detail below in conjunction with accompanying drawing:

[0055] refer to figure 1 In this embodiment, the cross-layer joint optimization method based on encoding and caching includes the following steps:

[0056] 1) The video-on-demand downlink transmission system in the cloud-edge collaborative network, assuming that there is a macro base station in the whole scene, there are multiple micro base stations within its coverage area, the number of MEC servers is K, and the cache capacity of each MEC is Φ k , Each MEC is connected to a micro base station, and there are F original video sequences to be encoded and buffered, and the video files are sorted by popularity as V 1 ,V 2 ,...,V F , get the probability p that the user requests the jth video file j , For a Zipf distribution that satisfies the skew factor θ:

[0057]

[0058] 2) For video services without packet loss, if the number m of all video packets sent by...

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Abstract

The invention discloses a cross-layer joint video transmission method based on encoding and caching. The method establishes a backhaul link security transmission model according to the conditions satisfied by the backhaul link load and the number of transmission packets; establishes the quality of experience QoE of video files The functional relationship between the MEC cache, the video file transmission delay and the encoded packet size; to establish the above two functional relationships, the video encoding bit rate, the capacity of the MEC cache, and the secure transmission model of the backhaul link are Constraint conditions, with the optimization goal of maximizing video experience quality and minimizing transmission delay, establish a joint optimization model of video coding parameters and MEC cache; find an approximate optimal solution for the joint optimization model of video coding parameters and MEC cache, and use the approximate optimal Solution Develop a storage strategy for video files that maximizes the quality of experience and minimizes transmission delay. The present invention can improve the quality of video experience and reduce the transmission time delay under the condition of ensuring the safety of the backhaul link.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a cross-layer joint video transmission method and system based on encoding and caching. Background technique [0002] With the rapid development of video processing technology and mobile communication technology, a large number of ultra-high-definition (UHD) video-on-demand (VoD) for large-scale connections have emerged. The number of user video requests increases sharply, resulting in heavy network traffic burden and long user waiting time. These factors will bring poor quality of experience (QoE) to video request users. Mobile edge computing (MEC) technology, as one of the key technologies for cloud-edge collaborative networks in fifth-generation (5G) systems, provides a promising approach to address these challenges. Since the MEC server is closer to the user at the edge of the network and has a powerful intelligent storage function to pre-cache popular videos, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/231H04N21/238H04N21/24
CPCH04N21/238H04N21/23106H04N21/2402
Inventor 贺丽君赵菼菼李凡
Owner XI AN JIAOTONG UNIV