Theoretical Research And Application Of Next-Generation Network Transmission Control

With the diversified development of Internet technology,it is particularly important to ensure stable network transmission.The bandwidth resources provided by the network are limited,and network congestion will occur when the network continues to be under high load.Slight network congestion will increase the transmission delay and reduce the quality of network service.Severe network congestion can lead to extreme performance drop even lead to the collapse of the network.Therefore,it is necessary to control network congestion.Congestion control algorithms can be divided into TCP congestion control algorithms and IP link congestion control algorithms.The TCP congestion control algorithm is applied to the client system.The client sends the data packet to the network,and after receiving the congestion information fed back by the server,the TCP congestion control algorithm is used to adjust the data packet sending rate.The IP link congestion control is applied to the packet forwarding device,and the preset buffer space is controlled and managed to evaluate the network congestion.Then feed it back to the client or directly drop the packet.This paper conducts theoretical research and performance evaluation on congestion control algorithms,and proposes a new congestion control algorithm.The contents and results are as follows:Firstly,this paper conducts theoretical research on TCP congestion control algorithm and IP link congestion control algorithm,and analyzes the advantages and existing problems of different congestion control mechanisms.Secondly,this paper builds some simulation models in NS3 to evaluate the performance of the congestion control algorithm.By deploying different TCP congestion control algorithms on different clients,it is verified that there is a fairness problem in the bandwidth resource occupancy of TCP flows.When the client deploys the same TCP congestion control algorithm,the TCP flows can be transmitted with high bandwidth.This paper verifies the impact of buffer size on TCP flows performance.In addition,it is verified that the combination of TCP congestion control algorithm and AQM algorithm can improve the throughput and stability of TCP flows.Finally,this paper proposes a lightweight IP link congestion control algorithm,which based on Sketch,and explains the solution of Sketch-AQM algorithm.By evaluating the performance of the Sketch-AQM algorithm in NS3,the evaluation indicators include throughput,fairness,packet drop rate and robustness,and compared with the existing RED,Co Del and PIE algorithm.The simulation results verify the effectiveness of the Sketch-AQM algorithm.Through a large number of network model tests,it has verified the performance of the Sketch-AQM algorithm for fine-grained differentiation of packet drop strategies.The algorithm can effectively improve link throughput and stability during transmission,and has the ability to quickly identify and alleviate network congestion.