Cross-layer optimization method of video service in wireless communication

Abstract

The invention discloses a method which means when a wireless communication system carries out a video service, a combined application layer, a physical layer and a data link layer carries out cross-layer optimization to the video service. The method comprises the following steps that: a. when a video user initiates the video service, a video service server estimates demand bandwidth information of the user according to the demand of the video user; b. the video service server sends a message according to the estimated demand bandwidth information so as to notify a wireless resource management module of the system; c. the wireless resource management module schedules the physical layer so as to provide adaptive wireless resources for the video user according to the notification of the video service server. By using the method of the invention, the wireless communication system can effectively use the limited wireless resources to provide a service quality which satisfies the demand for the video user. The wireless resource wastes can be avoided. And the video user can adapt wireless link changes and baneful influences of the wireless link changes on the video service quality can be reduced. Therefore, the service quality obtained by the video user can be improved and user experiences can be improved too.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for cross-layer optimization of video services by combining an application layer, a physical layer and a data link layer when a wireless communication system performs video services. Background technique [0002] In the existing wireless communication technology, when the wireless communication system performs video services, the data link layer of the wireless communication system estimates the required bandwidth of the video user according to the arrival speed of the video data packet, and the wireless resource management module , to schedule the physical layer to provide video users with wireless resources required for video services. However, in the process of wireless communication, the wireless channel conditions are not constant or fluctuate steadily, and the factors of wireless link changes are complex and unpredictable. The transmission delay, so...

AI Technical Summary

Problems solved by technology

However, in the process of wireless communication, the wireless channel conditions are not constant or fluctuate steadily, and the factors of wireless link changes are complex and unpredictable. The transmission delay, so the arrival speed of video data packets largely depends on the wireless link conditions, which cannot truly reflect the needs of video users, so the wireless resources provided by the wireless communication system for video users may not be able to adapt to the needs of video users , if the wireless resources allocated to video users are higher than user needs, it may cause waste of system wireless resources; if the wireless resources allocated to video users are lower than user needs, it may cause poor service quality for video users and reduce user to experience

[0003] During the video service process, the video service server will monitor the video stream status of the video user to estimate the wireless link information such as the wireless bandwidth for carrying the video user service, the delay in sending video data packets, etc., and adjust it according to the estimated wireless link information. The video stream of the video user is adapted to the current wireless link status, but the video service server is located at the application layer, and the video data packets transmitted in the wireless link need to be assembled and decoded to become a video stream that can be monitored by the application layer. The delay brought by the packet decoding process will cause the video stream status of the video user monitored by the application layer to fail to truly reflect the actual situation of the wireless link, resulting in the estimation of the video service server. If there is a deviation in the status of the wireless link of the video user service, then the video service server will not be able to achieve the purpose of adapting to the change of the wireless link by adjusting the video stream status of the video user. Quality of service received by video users

[0004] To sum up, when the wireless communication system uses the existing technology to provide video services, it may not be able to provide video users with wireless resources that meet user needs, resulting in waste of wireless resources or poor service quality for video users, and the video service server is now Some video stream state adjustment mechanisms may not be able to meet user needs

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