Data transmission method and data transmission device thereof

Abstract

The invention discloses a data transmission method, which is applied to dynamic code rate video data transmission under a user datagram protocol UDP. The method comprises the following steps: determining a transmission quota of a (T+N) transmission period according to a packet loss rate and a load condition in a T transmission period, wherein the sending quota of the (T+N) sending period is the maximum number of bytes allowed to be sent in the (T+N) sending period; and sending data according to the sending quota of the (T+N) sending period. According to the embodiment provided by the invention, the sending quota of the current sending period can be determined and the data can be sent according to the packet loss rate and the load condition in the preorder sending period, so that the sending quota of the current sending period can be flexibly adjusted according to the data sending condition of the preorder sending period; and network congestion in the data transmission process can be effectively reduced, and the timeliness of data transmission is improved.

Description

technical field [0001] The present application relates to the communication field, in particular to a data transmission method and a data transmission device thereof. Background technique [0002] With the development of technology, the amount of data to be transmitted is also increasing, especially for real-time audio and video data, which puts forward higher requirements for network transmission. The network bandwidth is limited by the actual physical link and the processing capacity of the router on the link. In theory, there is a maximum value. If the currently sent audio and video data is greater than the current bandwidth, the User Datagram Protocol (English: User Datagram Protocol, referred to as UDP ), the data packets will be sent directly to the network, which will cause an instant impact on the network. If it is on a network with limited bandwidth, it will further deteriorate the network condition and cause a large number of network packet loss. [0003] For the ...

AI Technical Summary

Problems solved by technology

The network bandwidth is limited by the actual physical link and the processing capacity of the router on the link. In theory, there is a maximum value. If the currently sent audio and video data is greater than the current bandwidth, the User Datagram Protocol (English: User Datagram Protocol, referred to as UDP ), the data packets will be sent directly to the network, which will cause an instant impact on the network. If it is on a network with limited bandwidth, it will further deteriorate the network condition and cause a large number of network packet loss

[0003] For the audio and video data packets sent, determine the sending interval so that the data packets are evenly distributed in the current time sequence. In the field of real-time audio and video, it is usually required to use a fixed bit rate for encoding, and the fixed bit rate will not bring any impact on the network. Instantaneous impact, which leads to network congestion, but there are some problems with the fixed bit rate, making it unsuitable for storage, such as insufficient bit rate for complex pictures, blurred pictures, waste of bit rate for simple pictures, waste of storage space, video files of the same size , the quality of the fixed bit rate is worse than that of the dynamic bit rate

[0004] When the dynamic bit rate video is transmitted in real time, due to the uneven distribution of the bit rate in time, when the bit rate peaks, it may have an instantaneous impact on the link, resulting in network congestion

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