针对车载网(VANETs)城市场景的路由问题,提出基于4G网络的长期演进(LTE)和VANETs混合结构的地理路由LTE?GR.LTE?GR路由充分利用LTE高峰速率和低时延特性,辅助VANETs间的数据传输.基站eNodeB收集路段信息,计算路段稳定值,并与门限值进行比较,若小于门限值,则利用eNodeB转发数据包;否则,就引用贪婪转发地理路由传输数据包.仿真结果表明,相比于同类路由,提出的LTE?GR路由能有效地提高数据包传输率、端到端传输时延性能.%An LTE and VANETs based geographic routing(LTE?GR)is proposed to solve the routing problem of VANETs urban scene,which makes full use of the characteristics of LTE high peak rate and low delay to assist the data transmission among VANETs. The eNodeB can collect the information of road segment,and compute the stability value of road segment to compare it with threshold. When the stability value is lower than the threshold,the data packet is forwarded with eNodeB. Other?wise,the data packet is transmitted with greedy forwarding geographic routing. The simulation results show that,in comparison with similar routings,the LTE?GR can improve the data packet transmission rate and end?to?end transmission delay.
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