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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。
Aiming at the problem that the performance of existing location-based routing protocols, such as the GPS (greedy perimeter stateless routing) protocol, is greatly affected by the destination node mobility, a routing strategy based on distributed location services is proposed. The routing strategy assists data packet forwarding by introducing a distributed location server in the road network. In addition to regularly maintaining the location information of vehicle nodes in its area and storing it in the local node location table, the distributed location server also periodically exchanges with the neighbor location server The information in the local node location table is saved in the neighbor table. Based on these node location information tables, in the routing strategy, the sending node forwards the data packet to the local location server first, and then the local server makes the next routing decision according to the local node location table or the related information of the destination node in the neighbor table until Data packets are forwarded to the destination node. The results show that routing strategy based on distributed location service can effectively improve the packet delivery rate and reduce the routing overhead, and can be more suitable for vehicle Ad Hoc networks with fast network topology agility.