Achieving consistent low latency for wireless real-time communications with the shortest control loop

• DOI: 10.1145/3544216.3544225
• Publication Date: 2022-08-11T22:58:16Z
• Authors: Zili Meng; Yaning Guo; Chen Sun; Bo Wang; Justine Sherry; Hongqiang Harry Liu; Mingwei Xu
• Keywords: Fixed wireless

Real-time communication (RTC) applications like video conferencing or cloud gaming require consistent low latency to provide a seamless interactive experience. However, wireless networks including WiFi and cellular, albeit providing satisfactory median latency, drastically degrade at the tail due frequent substantial bandwidth fluctuations. We observe that control loop for sending rate of RTC is inflated when congestion happens access point (AP), resulting in untimely adaption dynamics. Existing solutions, however, suffer from fail quickly adapt In this paper, we propose Zhuge, pure AP based solution reduces by separating feedback congested queues. design Fortune Teller precisely estimate per-packet upon its arrival AP. To make Zhuge deployable scale, also Feedback Updater translates estimated comprehensible messages various protocols immediately delivers them back senders adaption. Trace-driven real-world evaluation shows ratio large performance degradation 17% 95%.