A Study Of Scheduleing Based On Dynamic Adjustment Of Congestion Window For MPTCP

With the rapid development of network technology and the wide popularization of network application,because of the advantages of end-to-end data transmission,Transport Control Protocol has developed as the most important transport protocol in scientific field.However,as the increasing complexity of network environment restricted quality of data communication,even leads to network failure or interruption,and users put forward higher requirements of the Internet application service,so the traditional TCP transport protocol have been unable to meet the demand of network communication.As the falling cost of equipment manufacture,multi-homing portable terminal has already become the most frequent network equipment of internet users,relying on a variety of network access technologies,multi-homing portable terminals provide stable implementation and reliable interaction of data through a variety of different network interfaces,With the updating iteration of network equipment,network transmission technologies obtain expansion and optimization,scientific researchers have proposed SCTP?mTCP?pTCP and MPTCP multipath transmission protocol,among them,the MPTCP(Multipath TCP protocol)is the emphasis research in this paper.MPTCP is the extensions of TCP in transport layer.Trough data transmission mechanisms such as data scheduling and congestion control,MPTCP unites effective bandwidth to improve the quality of data communications and enhance reliability and stability of network.This article mainly aims at data scheduling of MPTCP.Due to transmission differences among paths,the throughput will drop and lose balance of resource pooling.we raise a scheduling algorithm based on dynamic adjustment of congestion window for MPTCP,solving the decreasing of quality in data communication caused by the differences among paths.Depending on the introduction of delay ratio among paths,we realize the dynamic adjustment of congestion windows in data communication.A Scheduler Based on Delay Ratio in Multipath TCP reduces the differences in transmission performance among paths,and finally improve the throughput of MPTCP.However,the data scheduling algorithm as we said will causes imbalance in resource pooling,it will use the path which has the lowest delay frequently that leads to decrease of throughput of MPTCP,Therefore,this article further put forward a Congestion Control Algorithm Based on Resource Pooling in Multipath TCP that realize the dynamic adjustment of congestion windows when the paths receives or loses packets,complete the effective transfer of loading and improve the overall transmission performance of network.Finally,we set many different network environments through NS-3 simulation,proving the effectiveness of the algorithms proposed in this paper.