基于SDN架构的空间信息网络路由策略设计

Design of Spatial Information Network Routing Strategy Based on SDN Architecture

空间信息网络具有通信环境复杂、节点动态性强、星上处理能力有限和业务种类繁多等特点,导致传输时延大和丢包率高等问题。为此,文章提出一种基于软件定义网络(SDN)架构的空间信息网络路由策略设计。在SDN架构下,控制平面记录某一时刻整个卫星网络的链路状态,获取“源-宿”卫星节点间的路由集,并计算各类业务路由的时延、带宽和丢包率所占的权重,求三者加权和作为路由代价,之后采用改进的遗传算法求得路由代价最小的解,作为业务数据流转发的路由。通过仿真与SDN架构下的数据流退让路由(DFRR)策略和基于变形虫的波纹传播(AR)策略进行对比,结果表明:文章提出的路由策略时延平均降低4.3%,丢包率平均减少14.6%,可有效地保证空间信息网络的高效运行。

Spatial information network has the characteristics of complex communications environment,strong dynamicity of nodes,limited processing capacity on satellite and wide variety of services,which lead to large transmission delay and high packet loss rate.In order to solve these problems,a design of spatial information network routing strategy based on SDN(software defined network)architecture is proposed.Under SDN architecture,the control plane records the link state of the whole satellite network at a certain time,obtains the routing set between the sate￣llite nodes at both ends of the source-destination,calculates the weights of routing delay,packet loss rate and bandwidth of various services,and calculates their sum of weights as routing’s cost.And the minimum solution of routing cost is calculated by using the improved genetic algorithm,which is used as the routing of business class data stream forwarded.The simulation results are compared with DFRR(data flow retreat routing)strategy and AR(ripple-spreading based on amoeba)strategy based on SDN.The results show that the delay and the packet loss rate of routing strategy are reduced by 4.3%and 14.6%on average,which can effectively ensure the efficient operation of spatial information network.