System and method for optimizing video service transmission of wireless local area network

Abstract

The invention relates to a system and a method for optimizing video service transmission of a wireless local area network. In the system, a video service source is additionally provided with a video service grouping and classifying mark module; and each wireless node is additionally provided with a wireless channel quality perception module and a network layer processing module for autonomous optimization video transmission. The method comprises the following steps that: the video service source analyzes frame types which are loaded by video services in groups and importance of the frame types, maps each group into a plurality of network priorities, and loads network priority information to a differentiated services code point (DSCP) field of a service grouping network layer; when the video services are transmitted in the wireless local area network in groups, a plurality of buffer queue storage units in the network layer processing module on the wireless node store the video service with different network priorities into different buffer queues of the network layer in groups respectively; and a secondary autonomous scheduling unit dynamically changes a method for scheduling the buffer queues of all video services and improves the transmission performance of the video services according to load conditions and channel conditions perceived by the wireless channel quality perception module.

Description

technical field [0001] The present invention relates to a system and method for optimizing video service transmission in a wireless local area network, to be precise, relates to a network system and method using a new cross-layer structure to improve the service quality of video services in a wireless local area network; it belongs to the Internet technical field. Background technique [0002] With the rapid development of network technology and the compatibility, standardization and marketization of various wireless local area network products, as well as the simple layout of wireless local area network, convenient access, and free Internet access; More and more people choose a wireless local area network (wlan) access method to access the Internet, which makes the use of wireless terminal services more and more extensive. Now, wireless local area network technology is rapidly integrating into people's daily work and life. At the same time, with the development of broadba...

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Problems solved by technology

[0006] However, EDCF also has defects: when the multimedia service in the wireless LAN is under high load, its performance is not ideal

[0009] However, these methods still obviously have the following defects: First, they interfere with the service quality of other real-time services

For example, the improvement scheme mentioned above will affect the service quality of the audio service

Additionally, significantly exacerbated the number of virtual collisions

According to different frame types carried by video service packets, different packets are placed in different ACs. Although it can achieve the effect of differentiated services for packets with different importance in video services, it will also increase the virtual collision between ACs. The number of times affects the transmission effect

Furthermore, the user's moving speed, Rayleigh attenuation and surrounding environment will all affect the wireless channel

The above-mentioned various improvement schemes do not consider the real-time dynamic situation of the wireless channel, and cannot guarantee the video stream transmission according to the dynamic situation of the wireless channel.

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