VANETs中基于车辆编号的状态信息广播协议

摘要

车辆自组织网中车与车之间的状态信息收集需要周期性广播。随着网络中节点数目的增多，每个节点发送消息的数目会急剧增多，分组竞争加剧，导致高丢包率和较长接入时延。针对上述问题，本文通过给节点添加标号参数，减少车辆间非邻居节点的消息广播，从而控制节点发送消息的数目，以改进状态信息广播的收发机制，降低丢包率，缩短端到端平均传输时延。仿真结果表明，在高网络负载条件下，与原收发机制相比，平均丢包率减少了25.3%，平均竞争时延减少了27.4时隙。%Communications among cars in VANET require broadcasting state information periodically. With the increase of the number of nodes ,the quantity of message sent from nodes increase rapidly,leading to higher packet loss rate and longer access delay. In order to solve the above problem, in this passage, we optimize the send and receive mechanism by adding indicator parameter of nodes to decrease the broadcast information among non-adjacent nodes and control the quantity of message sent and consequently lower packet loss rate and shorten end-to-end backoff delay. As shown in simulation results, in saturated network, the average packet loss rate and the competitive delay decrease by 25.3% and 27.4 slots, respectively.