The airspace communication network based on spacecraft has a wide range of applications in regional information enhancement and emergency communication. In this paper, a routing algorithm for congestion degree detecti...The airspace communication network based on spacecraft has a wide range of applications in regional information enhancement and emergency communication. In this paper, a routing algorithm for congestion degree detection of multipath routing (CD_AOMDV) is proposed. The method of combining the whole congestion degree detection and local congestion degree detection before service initiation is adopted. Timely and accurate judgment of the congestion degree reduced the loss rate of the hot nodes, so the average packet loss rate reduced. Simulation results show that compared with the traditional AOMDV protocol, the CD_AOMDV proposed in this paper has reduced the packet loss and improved delay performance, which is more suitable for the airspace communication network.展开更多
针对组网导航系统(networked navigation systems,NNSs)中节点高速移动、能量受限及通信时滞的问题,融合了基于移动汇聚节点的交叉路由树构建及链式分簇相结合的路由协议(cross routing tree construction based on mobile sink and cha...针对组网导航系统(networked navigation systems,NNSs)中节点高速移动、能量受限及通信时滞的问题,融合了基于移动汇聚节点的交叉路由树构建及链式分簇相结合的路由协议(cross routing tree construction based on mobile sink and chain clustering,CRTCC),设计了一种基于节点分级的跨层媒介访问控制协议(medium access control protocol based on graded nodes,GN-MAC)。GN-MAC采取了基于竞争的媒介访问方式,结合CRTCC协议特点定义GN-MAC包格式并完成具有多级别节点的自适应虚拟分簇,同时设计了改进型节点移动性检测算法,作出了最优簇间切换决策,提出了基于优先级的竞争机制以及多信道通信机制。最后通过算例仿真,验证了GN-MAC在节点高速移动和多移动节点情况下,时滞和能耗得到了有效的控制。展开更多
文摘The airspace communication network based on spacecraft has a wide range of applications in regional information enhancement and emergency communication. In this paper, a routing algorithm for congestion degree detection of multipath routing (CD_AOMDV) is proposed. The method of combining the whole congestion degree detection and local congestion degree detection before service initiation is adopted. Timely and accurate judgment of the congestion degree reduced the loss rate of the hot nodes, so the average packet loss rate reduced. Simulation results show that compared with the traditional AOMDV protocol, the CD_AOMDV proposed in this paper has reduced the packet loss and improved delay performance, which is more suitable for the airspace communication network.
文摘针对组网导航系统(networked navigation systems,NNSs)中节点高速移动、能量受限及通信时滞的问题,融合了基于移动汇聚节点的交叉路由树构建及链式分簇相结合的路由协议(cross routing tree construction based on mobile sink and chain clustering,CRTCC),设计了一种基于节点分级的跨层媒介访问控制协议(medium access control protocol based on graded nodes,GN-MAC)。GN-MAC采取了基于竞争的媒介访问方式,结合CRTCC协议特点定义GN-MAC包格式并完成具有多级别节点的自适应虚拟分簇,同时设计了改进型节点移动性检测算法,作出了最优簇间切换决策,提出了基于优先级的竞争机制以及多信道通信机制。最后通过算例仿真,验证了GN-MAC在节点高速移动和多移动节点情况下,时滞和能耗得到了有效的控制。
