Closed-loop congestion control method based on cross-layer cache management in broadband multimedia satellite system

Abstract

A closed-loop congestion control method based on cross-layer cache management in a broadband multimedia satellite system relates to congestion control methods in the broadband multimedia satellite systems, solving the problem of poor congestion control effect brought about by long time delay and high bit error rates of channels in current broadband multimedia satellite systems. The method comprises the following steps: the satellite divides ATM cell streams sent out by a terminal station or a ground station into four categories according to the priority, stores the ATM cell streams in corresponding caches respectively and carries out cross-layer detection on each cell stream in the caches; if incorrect cells exist, the whole group to which the incorrect cells belong is discarded; conversely, cache management is carried out on the cells; the total number of the discarded cells and the total capacity of the cells in the caches are recorded; the congestion parameters in the broadcasting time interval are computed; the congestion parameters are broadcast to each terminal station or ground station and the terminal station or ground station adjusts the transmit velocities of the congestion parameters to realize easing the onboard congestion. The method of the invention is suitable for the communication transmission process in the broadband multimedia satellite system.

Description

technical field [0001] The invention relates to a congestion control method in a broadband multimedia satellite system. Background technique [0002] The development of broadband multimedia satellite system has become one of the new hotspots of current communication. But to meet the needs of the future, it is necessary to adopt a geostationary satellite with on-board processing (OBP, On-Board Processing) and on-board switching (OBS, On-Board Switching) functions. However, compared with the ATM (Asynchronous Transfer Mode) switching system of the terrestrial network, the resources on the star are limited and the satellite transmission delay is relatively large. If the feedback closed-loop control strategy on the ground is directly adopted, the congestion control information of each connection is transmitted from the sending end to the receiving end. This will not only bring a large transmission delay for the satellite, but also occupy too much on-board buffer memory and upli...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the existing congestion control method in the broadband multimedia satellite system has poor congestion control effect due to the long delay and high channel bit error rate in the satellite system, thus proposing the broadband multimedia satellite system based on the Closed-loop Congestion Control Method for Hierarchical Buffer Memory Management

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