Encoding Configurations for TileBased 360xc2xb0 Video 360xc2xb0 video streaming has drawn a lot of attention in the last years. In order to provide a good quality of experience with the existing device capability and available bandwidths several viewport dependent techniques have been investigated and developed. One of these techniques, as specified in MPEG OMAF, is to use tilebased streaming, with the 360xc2xb0 video being offered in a tiled manner at various resolutions. Thus, each user can retrieve the tiles at different resolutions, thereby selecting the tiles that match its viewport at highresolution. This paper provides an analysis on different configurations for tilebased 360xc2xb0 video streaming, comparing the quality that can be achieved by using them for different values of endtoend delays.

TranscodingEnabled Edge Caching and Delivery for TileBased Adaptive 360Degree Video Streaming The highdefinition and panorama characteristics of 360degree video make its transmission in existing networks more challenging. To alleviate this problem, this paper leverages transcodingenabled edge caching in tilegranularity and makes joint caching, transcoding and delivery decisions among multiple edge servers for adaptive 360degree video streaming. We formulate the joint caching, transcoding and delivery decisionmaking problem as a multivariate nonlinear integer programming problem, aiming at minimizing the aggregate network operational cost and balancing the server load, subject to storage and computation capacity constraints of the edge servers. Through decomposition and relaxation approach, the original intractable optimization problem is solved by an effective iterative algorithm. Finally, simulation results show that the proposed iterative algorithm outperforms the existing schemes in terms of resource utilization, cost reduction and server coordination.