Reverse Congestion Control Of Satellite Networks Base On Acknowledgment Mechanism

With the rapid development of space activities and space exploration,there is an increasing demand for large data transmission in the form of network in the space.The satellite network,with its wide coverage and large amount of data,is the core element of spatial network data,Satellite network communication has become a hot research.Especially the space and ground network integration is the focus of scholars.At present,people have made a lot of improvements in satellite network,such as high bit error rate and long delay,and the bandwidth utilization of satellite network has been improved a lot.However,for satellite networks,the forward and reverse link bandwidth asymmetry,The research on congestion control of link is very rare,which is a key point to improve the utilization rate of satellite network bandwidth.In this paper,bandwidth utilization is not high due to the asymmetry of satellite network bandwidth.The research status of SCPS-TP and transport layer protocol and acknowledgment mechanism is firstly introduced in this paper.On this basis,the characteristics of the existing acknowledgment mechanism and congestion control algorithm are introduced,and the problems in satellite communication are analyzed.(TCP Westwood Inverse SNACK),that is,in the reverse side of the satellite network to predict and judge the congestion in the reverse side of the satellite network through the SNACK to confirm that the network congestion control algorithm,Which can reduce the number of acknowledgment packets,alleviate network congestion,and improve the bandwidth utilization of satellite network to a certain extent.More suitable for space activities and communication needs.Choose LEO satellite network model to simulate TCPW-ISN algorithm in the paper.We use OPNET software to build the simulation platform.By establishing the topological structure of network layer,node layer and process layer,using the change of parameters,thus reducing the number of acknowledgments,easing the congestion of the network,Provides bandwidth utilization.A two-terminal one-way congestion control model is proposed.The model is simulated in the low-orbit model and the simulation platform is set up with OPNET software.The dynamic simulation.At the same time,evaluate every performance index of the simulation results,and verify and compare the round-trip delay,error rate and other indicators respectively.It is concluded that adding reverse congestion control to the asymmetric satellite network can improve to a certain extent Satellite network bandwidth utilization of the conclusions.