摘要
针对现有基于位置的路由协议如GPSR(greedy perimeter stateless routing)协议的性能受目的节点位置移动影响过大的问题,提出一种基于分布式位置服务的路由策略。该路由策略通过在路网中引入分布式位置服务器来协助数据分组转发,分布式位置服务器除了定时维护其辖区内车辆节点的位置信息并存入本地节点位置表外,还定时与邻居位置服务器交换本地节点位置表中的信息并保存于邻居表。基于这些节点位置信息表,在路由策略中,发送节点首先将数据分组转发至本地位置服务器,继而本地服务器根据本地节点位置表或邻居表中目的节点的相关信息做下一步的路由决策,直至将数据分组转发至目的节点。结果表明,在节点高动态移动的车载Ad Hoc网络环境中,基于分布式位置服务的路由策略能够有效提高分组投递率并降低路由开销,且更能适用于网络拓扑捷变的车载Ad Hoc网络。
The performance of the current location-based routing protocol such as GPSR （ greedy perimeter stateless rou- ting） is easily influenced by the rapid movement of destination node. To solve this problem, the RSDKS （routing strategy with distributed location service） is proposed. In RSDLS, DLSs （distributed location servers） are deployed at particular intersections to assist routing. Each DLS keeps records of local nodes within domain range in LNT （ local node-location ta- ble）, and shares LNT among neighbor location servers and maintains several NTs （neighbor tables）. Based on the location tables mentioned above, the sender node forwards the data packet to the local location server in premier by GPSR, and the local location server makes the following forwarding decision according to the records of destination node in LNT or NT. The results shows that the RSDES can achieve a better packet delivery ratio and a lower routing overhead, and is more suitable for VANET （vehicle ad boc network） where network topology is changed rapidly.
出处
《重庆邮电大学学报（自然科学版）》
CSCD
北大核心
2014年第5期598-604,共7页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
The National Natural Science Foundation of China(61071099)~~
