The Research Of Congestion Control Technology In Delay-Tolerant Network

With the development of wireless network,its application scenarios are constantly expanding and developing.In a lot of wireless network scenarios,the network delays and interruption often occur,which greatly limit the communication quality of the network.Therefore,the architecture of Delay-Tolerant Network(DTN)is proposed,which adopts the reliable overlay network architecture oriented message,and provides the solution for the limited network communication.The environment of DTN is relatively harsh,so the traditional Internet network congestion control technology can not be well applied to the DTN.To improve the communication quality,DTN is required to carry out reasonable congestion control.Aiming at the above problems,in order to reduce and prevent network congestion,this paper describes the architecture of DTN,studies the transmission mechanism,and puts forward the relevant cache management strategy and load control algorithm according to the network characteristics.Based on the real-time performance and the applicability of the control,a new cache management strategy based on node status is proposed.Through the detection and quantification of the active degree,the status of the node is divided,and then its cache data is managed by the multi queue sorting and the storage replacement.The transmission efficiency of the message is guaranteed,the transmission delay is reduced,the utilization rate of the resource is improved,and the network congestion is reduced.At the same time,according to the load status of the network,this paper presents an adaptive load control algorithm.On the one hand,according to the congestion status of the node,a reasonable forwarding strategy is made to select the appropriate relay node for the message.On the other hand,by adjusting the load control factor dynamically,the node's transmission rate can be adjusted adaptively.Experimental results show that the proposed algorithm can reduce the delay of transmission,ensure the reasonable allocation of the node resources,and balance the transmission capacity of each node and network load,so as to effectively prevent the network congestion.