摘要
针对LTP单会话传输中信道利用率不足的问题,本文基于多会话传输机制及数据聚合方法,提出了一种面向未来深空通信的LTP多会话数据聚合策略。结合深空信道非对称的特点,从避免上行信道拥塞的角度,对多会话聚合过程进行了简要的数学分析,得到了Bundle聚合数下界。在地月、地火场景中仿真分析了Bundle聚合的影响因素及聚合机理。结果表明聚合策略能有效提高深空信道利用率,非常适用于上下行速率比偏低、Bundle长度较小的深空通信场景。
Aiming at the problem of insufficient channel utilization in single session transmission of LTP protocol,a LTP multi-session data aggregation strategy based on multi-session transmission mechanism and data aggregation method are proposed for future deep space communication. By considering the asymmetric characteristics of uplink and downlink channels in deep space communication,the mathematical process of multi-session data aggregation is analyzed roughly to avoid uplink channel congestion,and the lower bound of aggregated Bundle number is obtained. The factors and mechanism of aggregated Bundles are analyzed by simulation under Earth-Moon and Earth-Mars scenarios. The results show that the data aggregation strategy can improve the channel utilization effectively and especially favors the transmission scenarios when the ratio of uplink and downlink transmission rates is low and the length of Bundle is small in deep space communication.
作者
吴海涛
梁迎春
Wu Haitao;Liang Yingchun(Zhaoqing University,Guangdong 526061 ,China)
出处
《航天控制》
CSCD
北大核心
2019年第2期73-79,共7页
Aerospace Control
关键词
深空通信
LTP
多会话
数据聚合
信道利用率
Deep space communication
Licklider transmission protocol
Multi-session
Data aggregation
Channel utilization
