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.