Congestion control method and system for real-time audio and video transmission of cloud terminal

Abstract

The embodiment of the invention discloses a congestion control method and system for real-time audio and video transmission of a cloud terminal. Comprising the following steps: a receiving end accurately predicts a bandwidth and a queue time delay gradient by using an improved Kalman filter which stably reduces gain by adjusting a process noise covariance matrix in stages, and determines a first target sending rate candidate according to the bandwidth and the queue time delay gradient; the sending end determines a second target sending rate candidate based on the packet loss rate, and performs a big or small decision on the two candidate rates according to the level of the packet loss rate so as to determine a final sending rate; in addition, when the packet loss rate exceeds a threshold value, the source end data flow is actively interrupted to prevent user misoperation. According to the method, the bandwidth prediction precision is improved, misjudgment speed reduction when the network condition is good is avoided, and the user experience in a severe network is improved.

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