I. Introduction
Virtual reality (VR) over wireless networks is gaining an unprecedented attention due to the ability of bringing immersive experience to users. VR application is computational-intensive, communications-intensive and delay-sensitive, leading to the fact that most of VR are wired with cables. Current wireless systems (e.g., LTE) cannot cope with the ultra-low latency and ultra-high throughput requirements of wireless VR application (e.g., 360-degree VR video) [1].