QoE优先的移动网络RRTCC传输改进策略

目前Chrome浏览器为WebRTC适配的RRTCC（receiver-side real-time congestion control)拥塞控制算法在移动网络环境的多流竞争情况下表现较差.在有TCP流共存的情况下会过度退让从而导致WebRTC流饥饿，在视频会议这种多WebRTC流并发的情况下，新加入的WetRTC流会损害已有流的通信质量.针对该问题，提出了QoE优先考量的RRTCC传输控制改进策略MTCIS，该策略根据对当前移动网络性能和QoE需求的分析，采取激进程度适中的WebRTC传输控制方法，避免了与TCP流竞争时过度退让的问题.针对多WebRTC流并发的场景，设计了并发流管理机制，在合理利用带宽和优先满足用户QoE的基础上，对视频流的传输参数进行动态调整.实验结果表明，在移动网络场景多流竞争的情况下，MTCIS策略能够有效地保证WebRTC的合理竞争性、稳定性和健壮性，提高了用户的QoE体验.

QoE Preemptive RRTCC Transmission Improvement Strategy for Mobile Network

Chrome browser provides a RRTCC (receiver-side real-time congestion control) algorithem for WebRTC, but it exhibits poor performance in the mobile network environment. It cannot effectively compete with other TCP flow applications, causing WebRTC starvation. Furthermore, in the case of multi-WebRTC concurrent flow, new entrants will impact the existing flows. This paper proposes a transmission control strategy MTCIS. The core of MTCIS is the use of an improved RRTCC algorithm in consideration of mobile network scenarios and QoE, and the proper control of WebRTC, which can avoid the problem of excessive concession when competing with TCP flow. While in multi-WebRTC flow concurrent scenarios, the MTCIS can dynamically adjust the transmission parameters of video streaming, based on the analysis of rational utilize bandwidth and priority to satisfy users'' QoE. Experimental results show that MTCIS can be used in mobile network environment of flows competition, ensure reasonable competition, stability and robustness of WebRTC, which improves the users'' QoE.