Multi-Multicast Scalable Video Transmission Based On Non-Orthogonal Multiple Access

Recently With the increasing popularity of smart mobile terminals and large-screen devices,video services have gradually become the mainstream business of cellular mobile communications.However,existing 3G/4G technologies cannot effectively utilize limited spectrum resources to meet the high-speed transmission of video data.Non-orthogonal multiple access(NOMA)technology enables multiple users to share the same frequency resources,improve the utilization of wireless resources,and achieve high-speed data transmission,so it is considered as a candidate for future 5G technology.Multicast is a good solution when multiple user equipments in the same cell request the same video content.Scalable Video Coding(SVC)is integrated into wireless video multicast to deliver video layers at multiple different bit rates.This scheme can meet the difference of user terminals and channels,and is not limited by users with the worst channel conditions,thereby improving system performance.Most of the existing SVC multicast schemes use orthogonal multiple access(OMA)technology to transmit different video layers on orthogonal frequency resources,which limits the utilization efficiency of spectrum resources.In this paper,a multi-multicast nonorthogonal multiple-access scalable video transmission scheme is proposed for the video transmission problem,taking advantage of the advantages of non-orthogonal multiple access technology and scalable video codec technology.The solution considers the channel allocation between multicast groups and the allocation of video layers and powers in the multicast group according to different requirements of the user for video quality,thereby maximizing the overall video quality of multiple groups of user experiences.Firstly,a scalable multicast model in non-orthogonal multiple access networks is established,and the transmission parameters of the system are analyzed.Then the problem of video layer and power allocation in the group and the channel allocation problem between groups are proposed.For the proposed problem,the recursive algorithm and dynamic programming algorithm with low complexity is used to solve the problem under the premise of satisfying the video quality requirements of each user.Finally,the simulation shows that the proposed multi-multicast non-orthogonal multiple-access scalable video transmission scheme can meet the needs of users more than the traditional video transmission scheme,and the performance is superior.