Research On Active Queue Management Algorithm Based On Feedback Mechanism In AOS

In order to adapt to the rapid development of aerospace technology,the International Spatial Data System Advisory Committee(CCSDS)has introduced a flexible and diverse data processing business advanced orbiting system(AOS)protocol.With the increasing amount of spatial data and the self-similarity of data streams,the congestion of space networks becomes inevitable.In order to alleviate the network congestion,an active queue management algorithm based on feedback mechanism in this thesis is proposed to achieve effective control of congestion.Main research contents include:First,the advanced orbiting system and the self-similarity of network traffic are introduced in detail.Network traffic has self-similar characteristics,which means that the traditional Poisson model is not suitable for self-similar traffic.This thesis introduces two business models that fit self-similarity: ON/OFF model and FBM model.They are modeled and simulated.Then,the RED algorithm which has good effect to deal with the network congestion phenomenon is introduced in detail,and the thought of this algorithm is used to improve the active queue management algorithm.The ON/OFF model is used to simulate the Self-similar traffic and count the duration of each source in the ON state of this model and find the average of the time.By comparing this value with the set threshold,it determines the discarding of the data packet,realizes the control data transmission rate and alleviates the network congestion.Finally,considering the AOS multiplexing model introduced into the queue management module,each module can be combined with each other to realize the further optimization of the control network congestion.A feedback mechanism is added to the queue management algorithm based on the improved queue management module to feedback the tension of the frame buffer of the virtual channel scheduling module to the queue management module so as to obtain a more efficient active queue management algorithm based on feedback mechanism.The active queue management algorithm takes into account the tension of the data buffer and the buffer of the data frame buffer,and uses MATLAB software to build the simulation platform for simulation.By evaluating the performance of the simulation results,it is concluded that the active queue management algorithm with feedback adjustment can greatly improve the performance of the system.