A video multicast method based on video frame structure and d2d communication

Abstract

The invention discloses a video multicast method based on video frame structure and D2D communication. A base station declares a certain video multicast service, and all interested users in a cell join the service and form a multicast cluster; The transmission time of the basic unit GOP is a cycle, and the base station multicasts the video stream to the users in the cluster; after the end of the multicast sub-slot, the user checks the information he has received, and reports the sequence number of the frame with packet loss in the GOP to the base station ; The base station receives the user's feedback information, establishes a sequence table according to the priority of the frame to be repaired, and establishes the CQI matrix of the D2D link between the target frame ACK-devices and NACK-devices; performs relay selection and grouping according to the CQI matrix, and calculates the transmission The time T required for the target frame m m ;Transmission is complete, delete the sequence number of the current target frame in the sequence table. The invention effectively overcomes 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 in the limited frequency spectrum resource from the perspective of users.

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

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