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由于地理路由的有效性和可扩展性,这类路由算法成为移动ad hoc网络(MANET)中的一个研究热点。然而,在真实不可靠的链路环境下,简单的贪婪转发会导致较低的投递率,并且缩短了网络寿命。因此在提高投递率的同时延长网络寿命是一个重要问题。在本文中,我们为有损链路的MANET提出了一种新颖的地理路由算法ELGR。它结合能量效率和负载均衡来做路由选择。第一,我们设计了一种基于数据包接收率PRR(packets reception rate)的链路估计方法,来提高能量效率。第二,每个节点通过了解邻节点的负载状况来达到转发时的负载均衡。我们的仿真结果表明,与几个典型地理路由相比,ELGR算法延长了网络寿命20%,并且显著提高了数据包的投递率。
Due to the validity and scalability of geographic routing, this kind of routing algorithm becomes a research hotspot in mobile ad hoc networks (MANETs). However, in a truly unreliable link environment, simple greedy forwarding leads to lower delivery rates and shortened network lifetimes. Therefore, it is an important issue to increase the lifetime of the network while improving the delivery rate. In this paper, we propose a novel geographic routing algorithm, ELGR, for MANETs that compromise links. It combines routing with energy efficiency and load balancing. First, we design a link estimation method based on the packet reception rate (PRR) to improve the energy efficiency. Second, each node knows the load status of its neighbor nodes to achieve the load balancing during forwarding. Our simulation results show that, compared with several typical geographical routes, the ELGR algorithm extends the network lifetime by 20% and significantly improves the delivery rate of data packets.