Video frame structure and D2D communication based video multicast method

Abstract

The invention discloses a video frame structure and D2D (Device-to-Device) communication based video multicast method. The video frame structure and D2D communication based video multicast method comprises steps that a base station announces a video multicast service, and all the interested users in a cell join in the service to form a multicast cluster; the base station carries out video stream multicast for the users in the cluster by regarding the transmission time of one basic unit GOP (Group of Pictures) in a video code as a cycle; the users check received information and report sequence numbers of frames having packet loss in the GOP to the base station after the multicast sub time slot is ended; the base station after receiving feedback information of the users establishes a sequence list based on the priorities of to-be-restored frames and establishes a CQI matrix of a D2D link between target frames ACK-devices and NACK-devices; relay selection and grouping are performed based on the CQI matrix and the time Tm required for transmission of the target frame m is calculated; and after the transmission is finished, the sequence number of the current target frame in the sequence list is deleted. The video frame structure and D2D communication based video multicast method efficiently overcomes the problem that the multicast rate in the multimedia multicast is always affected by the worst fading channel in the cluster, and greatly improves the video quality within limited spectrum resources from the perspective of the user.

Description

technical field [0001] The invention belongs to the technical field of wireless communication (multimedia multicast), and in particular relates to a video multicast method based on video frame structure and D2D communication. Background technique [0002] Wireless communication uses electromagnetic waves for information transmission, which is a new technology field that has developed rapidly in recent years. It uses wireless transmission methods instead of cable-like physical transmission media, allowing users to access the network, thus reducing costs, improving flexibility and scalability. Since the first commercial cellular phone system appeared in the United States in the late 1970s, mobile wireless communication has experienced the first generation cellular network to the second generation mobile communication technology (2G) digital cellular system to the third generation mobile communication technology (3G) ) broadband wireless system to Long Term Evolution (LTE, Lon...

AI Technical Summary

Problems solved by technology

Solve the problem that the multicast rate is affected by the worst fading channel in the cluster in the traditional multimedia multicast scheme by using D2D communication

By taking advantage of the particularity of the video frame structure and combining the actual needs of users, with the assistance of the base station, the relay users can transmit the same content at the same time, solving the common interference problems in the existing D2D cooperative multicast solutions, and using single-frequency Resource allocation method, increasing the flexibility of relay selection and grouping and improving spectrum efficiency

Images