Self-adaptation flow control method suitable for wireless projection system real-time data transmission

Abstract

The invention discloses a self-adaptation flow control method suitable for wireless projection system real-time data transmission. The method includes the following steps: 1, a low pass filter is introduced in to calculate a smooth packet loss rate; 2, according to a network packet loss rate fed back by a receiving end, a network band width is divided into a jam state, an idle state and a full-load state; 3, the network state is judged to adjust transmitting speed in real time, if the network state is of the jam state, the transmitting speed is reduced and if the network state is of the idle state, the transmitting speed is increased, a loss rate of a smooth packet passing through the low pass filter is recalculated at the current moment to prepare judgment of the network state next time, and if the network state is of the full-load state, through calculation of integral marked quantity of transmission delay and delay jitter of a network, the transmitting speed is adjusted; and 4, a loss rate of a smooth packet passing through the low pass filter is recalculated at the current moment to prepare judgment of the network state next time. According to the self-adaptation flow control method suitable for the wireless projection system real-time data transmission, adjustment errors and large-margin shocking of the transmitting speed are reduced, the defects that an application flow is strong in burstiness, large in jitter and the like are overcome, and the transmission service quality is improved.

Description

technical field [0001] The invention relates to the technical field of wireless network transmission, in particular to an adaptive flow control method suitable for real-time data transmission of a wireless projection system. Background technique [0002] The problem of wireless network transmission service quality is the core issue restricting real-time data transmission in wireless projection systems at present. If you want to transmit a large amount of real-time data information on a network with limited bandwidth and meet certain quality requirements on the client, then In this case, it is necessary to adopt a certain flow control strategy, not only to avoid network congestion, but also to make full use of bandwidth resources. An effective adaptive flow control strategy has a relatively stable impact on the quality of data transmission, and can reduce a large number of fluctuations in the quality of streaming media transmission. [0003] At present, the relatively mature...

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Problems solved by technology

However, in fact, this rate adjustment method based only on the packet loss rate is somewhat one-sided. On the one hand, the packet loss rate and transmission delay will increase when the network is congested. Obviously, the error caused by the above adjustment method increases. When the network changes from full load to congested, the above adjustment method will cause a large fluctuation in the sending rate

Although the advantage of this strategy is that its working principle, stability, fairness and other characteristics are familiar to everyone, and its implementation is very simple, but its disadvantages lie in the emphasis on congestion control, large changes in sending rate, and bursty nature of application flows. Strong, large jitter, low accuracy in reflecting real-time changes in traffic, unable to dynamically adapt to network status, not conducive to improving the utilization of network bandwidth, and thus cannot meet the quality of service requirements of clients in wireless projection systems

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