摘要
机会网络具有节点移动性强、节点分布稀疏等特点,这会引起源节点与目的节点之间不存在稳定的通信链路、通信易中断、投递率低等问题,使得机会网络路由协议面临着巨大的挑战.在对概率路由协议研究的基础上,本文利用节点相遇间隔时间优化相遇概率的估算,使转发节点的选择更准确;定义了消息价值模型,计算发送队列中每一条消息的价值,根据消息价值大小决定发送消息的顺序,减少低价值消息引起的无意义转发.仿真结果表明,与其它机会网络路由协议相比,所提出的基于消息价值的路由协议,能够有效地提高消息的投递率,降低网络负载率和平均转发次数,从而使机会网络的性能得到提升.
The opportunistic network has the characteristics of node mobility and sparse distribution, which can cause the problems that it is not a stable communication link between the source node and the destination node,the communication is easy to break and the de- livery ratio is low. Based on the research of the probabilistic routing protocol using history of encounters and transitivity, this paper makes use of the encounter interval to estimate encounter probability. Then selects the retransmission nodes exactly base on encounter probability. This paper also defines a message value model, which calculates the value of each message in the transmission queue. Mes- sage value determines transmission order, which will reduce meaningless transmission. The simulation results show that the proposed routing protocol can effectively improve the delivery probability, reduce the network overhead ratio and average relayed times, so as to improve the performance of opportunistic network.
出处
《小型微型计算机系统》
CSCD
北大核心
2016年第12期2603-2606,共4页
Journal of Chinese Computer Systems
基金
河南省教育厅科技研究重点项目(14A520021)资助
关键词
机会网络
相遇概率
消息价值
投递率
opportunistic network
encounter probability
message value
delivery probability
