Satellite network active queue management method based on sizes of groups

Abstract

The invention discloses a satellite network active queue management method based on the sizes of groups. The method includes the following steps that firstly, the sizes of groups in which group data just arrive are acquired; secondly, according to the sizes of the groups, the value of a packet loss probability impact factor function based on the sizes of the groups is calculated; thirdly, the packet loss probability pz of a PID controller suitable for a satellite network is calculated, the total packet loss probability p of a router is calculated according to the packet loss probability pz and the value of the packet loss probability impact factor function, the size of a router cache is set to be qlim, and if q(k) is larger than or equal to qlim, the group data are abandoned; if q(k) is smaller than or equal to qlim, the probability for abandoning the group data is p; fourthly, and the groups which are not abandoned enter a queue for queuing. The total packet loss probability of the router is calculated according to different sizes of the groups, in other words, the large groups have the small packet loss probability, the small packets have the large packet loss probability, and therefore data packets with the large sizes of the groups can be protected.

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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