Fog-Assisted Virtual Reality MMOG with Ultra Low Latency

Abstract

In this paper, we propose a method to realize a virtual reality MMOG with low latency. The basic idea of the proposed method is to introduce an intermediate layer consisting of several fog nodes to offload the rendering of game view from the cloud server which conducts the rendering in conventional cloud games. In addition, we propose three techniques to further reduce the latency: 1) To maintain the overall game space in a consistent manner, the collision detection of virtual objects is conducted by the cloud server in a centralized manner; 2) To reflect subtle changes of the line of sight of a player to the resulting game view, such a change is acquired by the HMD worn by the player, and is directly sent to the corresponding fog node to alleviate the VR sickness; and 3) To overcome the overload of fog nodes concerned with the rendering, we separate the rendering of the background view from that of the foreground view, and offload the former to other nodes including the cloud server. The performance of the proposed method is evaluated through experiments conducted on a prototype system.