一个适用于DTN网络的拥塞避免与解除方案

Congestion control solution to avoid and remove congestion for delay-tolerant network

DTN(delay-tolerant network,延迟容忍网络)的网络特点及其采用的托管传输机制易造成网络受限资源(如缓存、带宽等)的耗尽,形成网络拥塞,导致网络性能的下降。传统TCP拥塞控制机制不适用于DTN网络。提出了一个全新的适用于DTN网络的拥塞避免与拥塞解除方案。拥塞避免根据在足够小的时间段内DTN链路的传输延迟和传输能力的确定性,建立DTN网络有向多径图,对数据发送速率、接收速率、带宽使用等链路负载分割与约束控制,尽可能地提高网络资源的利用率。拥塞解除在节点存储资源划分的基础上,通过节点内存储资源转换与节点间报文转移相结合的方法,解除DTN网络的拥塞状况。仿真结果显示,与其他DTN拥塞控制机制相比,所提方案具有良好的报文交付率、网络开销等网络性能。

In delay-tolerant network（DTN）,limited resources（such as buffer,bandwidth etc.） of nodes are more easily used up,resulting in network congestion and network performance deceasing,because of its network characteristics and custody transfer mechanism.The standard TCP congestion control mechanism is not suitable for DTN.This paper proposed a novel congestion control solution to avoid and remove congestion for DTN.Congestion avoidance built DTN directed multi-path graph,divided and set constrain controls on link load,such as message sending and receiving rate and bandwidth usage,in order to increase the network source usage,according to the definiteness of transfer delay and transfer ability in a period of time short enough.Congestion removing combined storage transformation in nodes and message transfer between nodes,to remove DTN congestion on the basis of node storage resource division.The simulation results indicate that the proposed solution has better performance in message delivery rate,network overhead etc.,than other DTN congestion control mechanisms.