MANETs中基于链路有效性预测的高效AODV路由协议.pdfVIP

Journal of Southeast University(English Edition) Vo1．23，No．4，PP．489—493 Dec．2007 ISSN 1003--7985 High efficiency AODV routing protocol based on link availability prediction in MANETs Liu Chao Hu Aiqun (School of Information Science and Engineering，Southeast University，Naming 210096，China) Abstract：To cope with the problem of low protocol efficiency of the standard ad hoc on—demand distance vector(AODV)routing protocol with the periodic Hello message broadcast mechanism，a new link availability prediction based strategy is introduced to reduce the amount of Hello messages．In this strategy，a novel wireless link availability prediction model under line—of-sight(LOS)propagation environments is proposed based on which the parameter of Hello Interval in AODV can be dynamically adjusted to achieve the goal of changing the frequency of Hello message broadcasts under different link stability degrees．Simulation results demonstrate that， compared with the standard AODV with the periodic Hello message broadcast mechanism，the proposed protocol effectively reduces unnecessary control message overhead and greatly improves the performance in term s of end—to—end delay and efficiency． Key words：Hello message；link availability；ad hoc on—demand distance vector；routing protocol；ad hoc In M A NETs without centralized infrastructures． the environment param eters of Hello Interval mobile nodes communicate with each other over multi— 1 Introduction of AODV hop wireless links if they are out of wireless transmis． sion range．It means that each node should commit it— In A0Dv．when a source node wishes to send a self to forward data packets from a neighboring node to packet