MANET中基于AODV的跨层多度量路由协议

AODV-based cross-layer multi-metric routing protocol in MANET

摘要:

针对无线自组网按需平面距离向量路由协议(AODV)路由度量的单一化而引起的节点能耗枯竭,形成的网络区域化以及路径拥塞问题，提出一种多度量路径选择机制的路由协议――M-AODV。以AODV路由协议为基础，在路由发现阶段，根据设定的能量阈值和接收信号强度阈值选择能量较高和信号强度较强的节点作为路由节点；在路径选择阶段，首先根据物理层的接收信号强度、拥塞度和跳数计算每段链路稳定值，其次将每段路径稳定值进行累加得到整条路径的稳定值,最后选择稳定值最大的路径作为最优路径。使用NS2.35仿真软件仿真，结果表明：改进后的协议与AODV相比在端到端延时缩短了近30%，在数据包传输率、吞吐量和节点存活率方面优于AODV和I-AODV-SE路由算法。

Abstract:

Aiming for the depletion of node energy consumption caused by the simplification of Ad hoc On-Demand Distance Vector(AODV) routing metrics, and the resulting network regionalization and high latency problem of path congestion, this paper proposes a routing protocol with multi-metric path selection mechanism—M-AODV. Based on the AODV routing protocol, in the route discovery phase, a node with higher energy and stronger signal strength is selected as a routing node according to the set energy threshold and the received signal strength threshold. In the path selection phase, firstly, according to the received signal strength, congestion degree and hop count of the physical layer, the stability value of each link is calculated; secondly, the stable value of each path is accumulated to obtain the stable value of the entire path; finally, the path with the largest stable value is selected as the optimal path. Simulation experiments are performed by using NS2.35 simulation software. The results show that the end-to-end delay of improved routing strategy is reduced by nearly 30% compared with that of AODV. It is superior to traditional AODV and I-AODV-SE routing algorithms in terms of packet transmission rate, throughput and node survivability.