Active Queue Management Method for Satellite Networks Based on Packet Size

Abstract

The invention discloses a satellite network active queue management method based on the packet size, which is characterized in that it comprises the following steps: S1: acquiring the packet size of just arrived packet data; S2: calculating the packet loss probability influence factor based on the packet size according to the packet size The value of the function; S3: calculate the packet loss probability pz applicable to the PID controller of the satellite network, calculate the total packet loss probability p of the router according to the value of pz and the packet loss probability influence factor function, set the size of the router cache as qlim, if q(k)>qlim, discard the packet data; if q(k)≤qlim, the probability of discarding the packet data is p; S4: put the undiscarded packets into the queue for queuing. The present invention calculates the total packet loss probability of the router according to the different packet sizes, that is, to achieve the purpose that larger packets have a smaller packet loss probability, and smaller packets have a larger packet loss probability, so as to protect larger packets. data pack.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to an active queue management method of a satellite network based on packet size. Background technique [0002] With the development of network communication, satellite network, as the extension of ground network, has attracted more and more attention of scholars. Due to the characteristics of large delay, high bit error rate, and asymmetric link bandwidth in satellite networks, the original congestion control algorithms on the ground cannot adapt to satellite networks, and active queue management must be applied to satellite networks. At present, many algorithms are involved in the active queue management method proposed by many domestic and foreign scholars. The main idea is to detect the occurrence of congestion in advance, and randomly discard packets (or send a congestion message to the source node) before network congestion occurs. to avoid congestion. [000...

AI Technical Summary

Problems solved by technology

The PI algorithm mainly introduces the PI controller and uses its packet discard probability as a linear function of the instantaneous queue length to manage the queue length. Although it enhances the stability of the AQM system, this method relies too much on the size of the buffer space and transient performance. Not ideal, etc.; PID algorithm is a queue management method designed to improve the defects of PI by introducing differential constants. In a large-delay network environment, the performance of the PID controller is superior to that of the PI controller, so the PID controller has a simple design structure. , superior robust performance, able to overcome large delays, suitable for high-speed networks, etc., but it discards all packets with the same probability of packet loss, which has problems in transmission efficiency

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