一种空间延迟容忍网络中的周期性链路数据转发算法

A Data Forwarding Algorithm for Periodical Links in Space Delay-Tolerant Network

空间延迟容忍网络的链路具有间歇连通的特点,难以形成一条端到端的路径,使得基于TCP/IP的端端数据传输机制无法适应空间延迟容忍网络.空间延迟网络中存在着大量连通时间短暂、具有周期性连通规律的卫星节点,它们处于高速周期性运动中,在空对地、空空之间构建了空间网络的核心链路.针对空间延迟容忍网络中的周期性连通链路,通过对卫星运行规律的分析,计算单颗卫星对地周期性连通时间和星间链路的连通时间,定义空间链路的连通矢量,设计基于节点间连通矢量的数据转发算法,有效解决了空间网络周期性链路的数据有效转发问题,为空间网络面向延迟容忍的数据转发提供支持.仿真结果表明,该算法在周期性链路的情况下具有较好的传递成功率和传输延迟性能,更适合于具有周期性链路的空间延迟容忍网络环境.

The link in space delay-tolerant network is interform a end-to-end path. So data transmission mechanism by contacted, which makes it impossible to end-to-end based on TCP/IP can not be adjusted to space delay-tolerant network. In the space delay-tolerant network, there are large number of satellite nodes, which are shortly and periodical connected, and run very fast in periodical movement. They consist of the core link in space-to-ground and space-to-space. Toward the periodical contact links in space delay-tolerant network, the periodical contact time of a satellite to land and contact time of links between satellites are computed based on the analysis of moving regulation of satellites. The data forwarding algorithm based on contact vector between nodes is designed. This algorithm solves the problem of data effective forwarding in periodical links of space network in effect. The simulation results show that this algorithm has better performance on delivery successful rate and transmission delay in periodical links.