一种空间DTN接触图路由精确性提高方法

发布时间：2018-06-20 03:22

本文选题：接触图路由 + 非预期的接触中断　；参考：《铁道学报》2017年07期

【摘要】：接触图路由利用空间DTN节点运动轨迹可以预知的特点,将节点间通信的开始与截止时间、速率等信息配置在接触图中,以此为依据计算路由,但这也带来了对接触图准确性要求极高的问题。在复杂的空间环境中,短时的电磁干扰或能量过低等原因可能导致接触意外失效,此时按照原始配置计算的路径将无法使用,另外接触图路由未考虑排队时延对低生存时间束(Bundle)的影响,导致这些束可能会在排队中过期。针对上述问题,提出一种接触图路由精确性提高方法,包括接触失效发现机制、接触恢复探测机制、接触失效及恢复通告机制、接触图更新机制和考虑接触失效的路由计算机制,同时使用基于效用函数的转发策略优先发送生存时间低的束。实验表明接触图路由精确性提高方法在链路意外失效的情况下能够提高束的传递率、降低传递时延。
[Abstract]:Based on the predictive characteristics of the motion trajectory of space DTN nodes, the contact graph route allocates the information of the beginning and closing time and the rate of communication between the nodes in the contact diagram, based on which the routing is calculated. But this also brings the problem that the accuracy of contact diagram is very high. In complex space environments, short term electromagnetic interference or low energy may lead to accidental contact failure, at which time the path calculated according to the original configuration will not be available. In addition, contact graph routing does not take into account the effect of queueing delay on low lifetime bundles, which may lead to the expiration of these bundles in the queue. To solve the above problems, a method to improve the accuracy of contact diagram routing is proposed, including contact failure detection mechanism, contact recovery detection mechanism, contact failure and recovery notification mechanism. Contact graph updating mechanism and routing computer system considering contact failure are used in this paper. At the same time, Utility Function-based forwarding strategy is used to give priority to beams with low lifetime. The experimental results show that the proposed method can improve the transmission rate of the beam and reduce the transmission delay in the event of accidental link failure.
【作者单位】：北京交通大学电子信息工程学院;
【基金】：国家高技术研究发展计划(863计划)(2015AA015702) 国家自然科学基金(61271202)
【分类号】：TN929.5

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