车载传感网中基于群特性的MaxProp路由协议改进

IMPROVEMENT OF MAXPROP ROUTING PROTOCOL BASED ON GROUP FEATURES IN VSNS

车载传感网中信息传输面临的主要难题是网络间歇性连通和拓扑高度动态变化,以往常常采用机会转发的思想设计路由协议来解决此难题。但现有的机会路由协议忽略了网络中部分车辆节点具有群组移动的特点,从而导致协议在群组移动场景下的性能急剧下降。为此,通过对最大相遇概率路由进行改进,提出了一种基于群特性的MaxProp路由协议。该协议利用群组内成员节点之间极好的连通性,通过群内消息扩散,间接提高群内节点与群外节点之间的相遇概率,从而增加了消息转发机会。并在ONE仿真平台上,与其他几种经典的机会路由协议相对比,改进后的MaxProp路由协议在消息传输成功率、网络开销比方面具有明显提升。

The main problem of information transmission in VSNs is intermittent network connectivity and highly dynamic topology. In the past we often used the idea of forwarding the design of routing protocols to solve this problem.However,the existing opportunistic routing protocol ignores the features of some nodes in the network with group mobility,which leads to a sharp decrease of the performance of the protocol in the group moving scene. To solve this problem,a Max Prop routing protocol based on group features is proposed by improving the maximum probability of encounter. This protocol increases the message forwarding opportunities by increasing the probability of encounter between the nodes in the group and the external nodes indirectly through the inter-group message diffusion by using the excellent connectivity among the members of the group. In the ONE simulation platform,compared with other several classical opportunistic routing protocols,the improved Max Prop routing protocol has a significant improvement in message transmission success rate and network overhead ratio.