Optimal Transmission of Multi-Quality Tiled 360 VR Video in MIMO-OFDMA Systems
This work addresses efficient VR video delivery for users in wireless networks, presenting an incremental optimization-based design for a specific domain.
The paper tackles the problem of transmitting multi-quality tiled 360 VR video in MIMO-OFDMA systems by minimizing total transmission power through optimization of beamforming, subcarrier, power, and rate allocation, achieving significant performance improvements compared to existing solutions as shown in numerical results.
In this paper, we study the optimal transmission of a multi-quality tiled 360 virtual reality (VR) video from a multi-antenna server (e.g., access point or base station) to multiple single-antenna users in a multiple-input multiple-output (MIMO)-orthogonal frequency division multiple access (OFDMA) system. We minimize the total transmission power with respect to the subcarrier allocation constraints, rate allocation constraints, and successful transmission constraints, by optimizing the beamforming vector and subcarrier, transmission power and rate allocation. The formulated resource allocation problem is a challenging mixed discrete-continuous optimization problem. We obtain an asymptotically optimal solution in the case of a large antenna array, and a suboptimal solution in the general case. As far as we know, this is the first work providing optimization-based design for 360 VR video transmission in MIMO-OFDMA systems. Finally, by numerical results, we show that the proposed solutions achieve significant improvement in performance compared to the existing solutions.