360°视频混合单播-组播的服务器端传输策略  

Hybrid unicast-multicast server-side transmission strategy for 360-degree video

作　　者：刘城铭 邹君妮[1,2] Liu Chengming;Zou Junni(School of Command Info. Engineering,Shanghai University,Shanghai 200072,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200072,China)

机构地区：[1]上海大学通信与信息工程学院,上海200072 [2]上海交通大学电子信息与电气工程学院,上海200072

出　　处：《电子测量技术》2019年第17期130-135,共6页Electronic Measurement Technology

基　　金：国家自然科学基金(61622112)项目资助

摘　　要：360°视频是目前最热门的多媒体形式之一,由于其具有很大的尺寸和很高的分辨率,导致现有的网络环境很难为用户提供高体验质量(QoE)。另外,用户需要佩戴头戴式设备观看360°视频,而且用户间不能进行屏幕共享,这就导致即使用户请求相同的视频也无法通过为用户组播视频内容来节省带宽。针对360°视频较高的传输带宽需求和内容无法被共享的特性,提出了一种根据360°视频用户的视口(FoV)对用户进行聚类的方法。在这种聚类方法的基础上,进一步提出了一种服务器端的混合单播-组播码率自适应策略。将360°视频分成若干空间块,并在服务器将这些块的传输模式(多播或单播)选择问题和块的码率自适应问题表示为一个整数规划问题。通过松弛的方法求解上述问题。最后,通过仿真来展示本文提出的方法在360°视频传输中的性能。360-degree video is one of the most popular multimedia formats.Due to its large size and high resolution,it is difficult to provide users with high quality of experience(QoE)in the existing network environment.In addition,users need to wear a Head-Mounted Display(HMD)to watch videos,which makes it impossible to share screen between users and results in the inability to save bandwidth by multicasting video content even if users request the same video.Aiming at the high transmission bandwidth requirement of 360-degree video and the inability to share content,this paper proposes a method of clustering users according to the user’s 360-degree Field of View(FoV).Based on this clustering method,we further propose a hybrid unicast-multicast rate adaptation strategy on the server side.We divide the 360-degree video into tiles and model the transmission mode(multicast or unicast)selection problem and the rate adaptation problem of these tiles as an integer programming problem on the server side.This paper solves the above problem by relaxation method.Finally,the performance of the proposed method in 360-degree video transmission is demonstrated by simulation.

关 键 词：360°视频 用户聚类 混合单播组播 码率自适应 

分 类 号：TN919.82[电子电信—通信与信息系统]