Optimal Multicast of Tiled 360 VR Video
Optimal Multicast of Tiled 360 VR Video
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DOI：
10.1109/lwc.2018.2864151
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发表时间：
2019-02-01
影响因子：
6.3
通讯作者：
Liu, Zhi
中科院分区：
文献类型：
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作者：
Guo, Chengjun;Cui, Ying;Liu, Zhi
在这封信中，我们研究了从一台服务器（基站或接入点）到多个用户的平铺360虚拟现实（VR）视频的最佳多播。考虑随机观看方向和随机信道条件，采用时分多址接入。对于给定的视频质量，我们优化传输时间和功率分配，使平均传输能量最小。在给定传输能量预算的情况下，优化传输时间和功率分配以及每个帧的编码速率，以最大限度地提高接收到的视频质量。这两个优化问题是具有挑战性的非凸问题。我们获得了两个非凸问题的全局最优闭形式解，为平铺360度VR视频多播提供了重要的设计见解。最后，数值结果验证了所提方法的优越性。
In this letter, we study optimal multicast of tiled 360 virtual reality (VR) video from one server (base station or access point) to multiple users. We consider random viewing directions and random channel conditions, and adopt time division multiple access. For given video quality, we optimize the transmission time and power allocation to minimize the average transmission energy. For given transmission energy budget, we optimize the transmission time and power allocation as well as the encoding rate of each tile to maximize the received video quality. These two optimization problems are challenging non-convex problems. We obtain globally optimal closed-form solutions of the two non-convex problems, which reveal important design insights for multicast of tiled 360 VR video. Finally, numerical results demonstrate the advantage of the proposed solutions.