Tile caching for scalable VR video streaming over 5G mobile networks |
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| Affiliation: | 1. Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China;2. Zhejiang Wanli University, Ningbo, China;3. University of Thessaly, Volos, Greece;4. National Computer Network Emergency Response Technical Team/Coordination Center of China, China;1. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;2. National Engineering Laboratory for Robot Vision Perception and Control, Changsha 410082, China;3. Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G2E1, Canada;4. Department of Mechanical Engineering, York University, Toronto, ON M3J1P3, Canada |
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| Abstract: | Currently, VR video delivery over 5G systems is still a very complicated endeavor. One of the major challenges for VR video streaming is the expectations for low latency that current mobile networks can hardly meet. Network caching can reduce the content delivery latency efficiently. However, current caching schemes cannot obtain ideal results for VR video since it requests the viewport interactively. In this paper, we propose a tiled scalable VR video caching scheme over 5G networks. VR chunks are first encoded into multi-granularity quality layers, and are then partitioned into tiles to facilitate viewport data access. By accommodating the 5G network infrastructure, the tiles are cooperatively cached in a three-level hierarchal system to reduce delivery latency. Furthermore, a quality-adaptive request routing algorithm is designed to cater for the 5G bandwidth dynamics. Experimental results show that the proposed scheme can reduce the transmission latency over conventional constant bitrate video caching schemes. |
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| Keywords: | VR video Caching Video tile 5G systems |
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