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FPS Game Performance in Wi-Fi Networks

Multi-player online games (MOGs) have become increasingly popular on today’s Internet. Meanwhile, the IEEE 802.11 (Wi-Fi) wireless networks have been widely used. We study how well an underlying 802.11g network supports a first-person-shooter (FPS) game, often considered the most demanding MOG in terms of network performance. We measure the latency and loss ratio performance experienced by the game traffic; these network-layer metrics were shown to have large impact on the gaming quality experienced at the application layer. The effect on performance of the following factors were examined: the number of game clients, the distance between game clients and the wireless access point, the enabling of data encryption, and the inclusion of FTP and video streaming background traffic. Our experimental results show that FTP and video streaming traffic significantly affect the game traffic performance, whereas the distance and the use of data encryption have rather minimal impact. We also observe that when the amount of background traffic is moderate to high, the performance degrades as the number of game clients increases. Based on our observations, we suggest QoS strategies that may be used to better support games in a Wi-Fi environment.