A Method of Responding to Network Congestion Based on Network Jitter Algorithm

Abstract

The invention provides a network dithering algorithm based network congestion reflection method. The method includes the steps: step 10, taking a certain time interval as a unit for time discretization of continuous time, taking Di as transmission delay of data packets to calculate an average value of transmission delay from Ti-1 to Ti and an average value of transmission delay from Ti to Ti+1, and obtaining a change rate DRi of transmission delay according to the two average values; step 20, adjusting a reference value per unit time: E=E+DRi*delta t, wherein E refers to a value of expectation, delta t refers to time difference between two frames; step 30, judging whether the reference value needs to be reset or not, and if yes, resetting the reference value according to an equation: E=Di+DRi*(Ti+1-Ti) / 2; step 40, calculating a dithering value Ji according to an equation: Ji=(15*Ji-1+|Di-E|) / 16, and using the dithering value to represent network congestion conditions, wherein the larger the dithering value, the more serious the impending network congestion. By the network dithering algorithm based network congestion reflection method, network congestion conditions can be reflected timely and accurately, and sensitivity to network congestion is improved to lower packet loss rate.

Description

technical field [0001] The invention relates to the technical field of network transmission, in particular to a method for reflecting network congestion based on a network jitter algorithm. Background technique [0002] At present, with the rapid development of information technology and fierce competition among major operators, the optical fiber network has been greatly popularized. However, as the competition for network bandwidth resources becomes more and more fierce, the bandwidth is insufficient, which affects users in the process of real-time multimedia communication. For this reason, most developers of real-time multimedia communication applications currently use network adaptive technology to adjust the current bandwidth used to match the actual available bandwidth of the network, thereby reducing network packet loss and jitter when the available bandwidth is insufficient. To achieve the purpose of improving user experience, the network adaptive algorithm generally ...

AI Technical Summary

Problems solved by technology

The jitter calculation method in the existing RFC3550 protocol is to differentiate the sending timestamp and receiving timestamp of two adjacent packets. This method cannot indicate network congestion in a timely and obvious manner. From the mathematical model, it is Calculate the difference between the transmission delays of two adjacent packets, and then perform exponential smoothing on the absolute value of the difference. The final result is the network jitter value. This method of calculating the jitter value cannot sensitively reflect the network jitter. Only when the arriving packet delay is positive and negative alternately, can the congestion situation be reflected. If several positive delay packets are continuously received and then several negative delay packets are continuously received, the network situation cannot be timely and accurately fed back. However, when bandwidth is congested in actual video applications, this situation is often more likely to occur.

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