DTN中基于地理位置信息的备用副本转发算法*

针对容迟容断网络(Delay/Disruption Tolerant Networks, DTN)缺乏稳定的端到端连接、时延大和节点资源有限的特点,设计了一种基于广播的地理位置信息共享模型,提出了基于地理位置信息的备用副本转发算法。在不依托GPRS基站的条件下,将GPRS与DTN结合,为最优转发节点的选取提供位置信息；在消息副本转发失败时,备用副本选取新的转发节点,转发成功后,删除备用副本。仿真结果表明,算法在递交率、平均时延和网络开销方面表现优于Spray and Wait等对比算法,在车载自组网中具有很强的应用性。

Location Aided Routing with Alternative Copy in DTN

In allusion to the characteristics of lack of persistent end to end connections, high delays and restricted node resources in Delay /Disruption Tolerant Networks ( DTN),this paper proposes a location sharing model based broadcast and a routing algorithm based on location information with alternative copies. The algorithm combines DTN with GPRS to provide reliable node locations and speed vectors for the selection of forwarding nodes under the condition of no GPRS base stations; when failing in forwarding the message copy, select another node to forward the alternative copy, while delaying the alternative copy when success. The simulation results show that the proposed algorithm performs better in terms to the delivery ratio, the average end-to-end delays and the network overheads, which is significative to use in the VANET.