基于节点分级的NNSs跨层MAC协议设计

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。

Cross layer MAC protocol design of NNSs based on graded nodes

In order to solve the problems of high-speed mobility, energy limitation and communication delay of nodes in networked navigation systems(NNSs), a cross layer medium access control (MAC) protocol based on graded nodes(GN-MAC) is designed by which a routing algorithm combining cross routing tree construction based on mobile sink and chain clustering(CRTCC) is mixed. GN-MAC adopts the way of media access based on competition, defines the packet format according to the characteristics of CRTCC, and completes the virtual clustering with multi-level nodes. At the same time, an improved node mobility detection algorithm is designed, the optimal inter cluster handoff decision is made, and the priority based competition and multi-channel communication are proposed. Finally, the simulation shows that the delay and energy consumption are effectively controlled in the case of high-speed mobile nodes and multiple mobile nodes.