一种适应卫星网络的DTN分组路由策略

A DTN Packet Routing Strategy for Satellite Networks

在空间延迟容忍网络(DTN)中,由于卫星节点运行轨道的限制,造成节点运动并不具有典型随机性。节点间历史接触时间的长短和未来接触的概率往往存在正相关,并且根据卫星运行轨道的异同,接触的可能也存在较大差异。针对以上特点,结合现有DTN路由算法的优势,设计了一种基于历史信息统计的DTN分组路由策略,通过将卫星节点按运行轨道分组,并结合历史接触时长计算接触概率,以适应卫星网络节点运动场景,使接触概率预测更加准确,进而提高消息下一跳选择的准确性。仿真结果表明,该路由策略与现有路由算法相比,具有较低的缓存消耗,并有较高的消息投递率和较优的投递时延。

In the space delay tolerant network(DTN),the node motion is not typically random due to the limitation of the orbit of the satellite.There is a positive correlation between the length of historical contact time and the probability of future contact between nodes,and according to the similarities and differences of satellite orbit,the possibility of contact is also quite different.This paper aims at the above characteristics,combined with the advantages of existing DTN routing algorithms,designed a DTN packet routing strategy based on historical information statistics.By grouping satellite nodes into operational orbits,the contact probability is calculated by the historical contact time,and adapt to the motion of satellite network.To get more accurate contact probability predict,and improve the accuracy of next hop selection.The simulation results show that compared with the existing routing algorithm,this routing strategy has lower cache consumption,higher message delivery rate and better delivery delay.