B-TrunC video group call code rate adjusting method and system

Abstract

The invention discloses a B-TrunC video group call code rate adjusting method and system . The method comprises the following steps: a monitoring user performs packet loss detection on a received RTPstream to obtain a downlink packet loss rate, and feeds back the downlink packet loss rate to a network side; the network side counts the number of the monitoring users feeding back the downlink packet loss rate; when the judgment threshold is triggered, the downlink packet loss rate fed back by the monitoring user is comprehensively judged to obtain the average downlink packet loss rate of the video group call, the average downlink packet loss rate of the video group call is compared with the main speaking uplink packet loss rate of the video group, and the maximum packet loss rate is sent tothe main speaking end; and the main speaking end carries out code rate self-adaptive adjustment according to the received packet loss rate. According to the technical scheme provided by the invention, the code rate can be adaptively adjusted to adapt to the change of the network quality, the phenomena of jamming, blurred screen and the like can be avoided, and the user experience is improved.

Description

technical field [0001] The present invention relates to the technical field of broadband trunking communication, in particular to a B-TrunC (Broadband Trunking Communication, broadband trunking communication) video group call code rate adjustment method and system. Background technique [0002] In the B-TrunC standard protocol, the video group call service is defined. The working method of this service is to conduct point-to-multipoint video calls between multiple users in a group, and the speaker (speaker terminal) uploads the video screen to the network side. , the network side transmits the same video picture to multiple receiving users at the same time through the shared channel, which can significantly reduce the consumption of wireless transmission bandwidth. [0003] Due to the real-time requirements of the video, the video group call adopts the UDP (User Datagram Protocol) transmission method, and the transmission of the UDP protocol is not reliable. When the quality...

AI Technical Summary

Problems solved by technology

[0005] (2) For the monitoring users in the same group, the monitoring terminal in the weak coverage area suffers from serious packet loss, poor video quality, blurred screen, black screen, etc.

The possible reasons for this problem are: the downlink transmission of video group calls adopts a point-to-multipoint method, the physical layer does not have a HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) retransmission mechanism, and the application layer uses UDP transmission without retransmission mechanism, unreliable

At the same time, there is no corresponding rate adjustment mechanism on the network side to match the network bandwidth. For users with weak coverage, the downlink quality is poor, bandwidth congestion is prone to occur, and the video picture quality deteriorates.

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