面向空间差错信道的LTP协议优化
发布时间：2019-04-25 18:56
【摘要】：随着上世纪50年代前苏联的“月球一号”卫星发射,人类进入了深空探测的新时代。进入21世纪以来,由于航天相关技术的快速发展与经济政治军事等方面的需求,各个航空大国纷纷推出庞大的探测计划,例如美国“好奇号”和中国的“嫦娥二号”等。与此同时,未来深空通信传输数据量逐渐增加、服务业务种类愈发复杂,深空通信需要能够提供大数据量、全天候和多类型的数据交换服务。面向深空复杂多变的通信借鉴了空间IP协议和CCSDS协议体系的设计思想,通过覆盖层实现不同子网间互通互联,同时主要通过BP协议(Bundle Protocol)和LTP协议(Licklider Transmission Protocol)较为完善地解决了数据在恶劣环境下的传输问题。面对特殊的自然环境,借鉴地面Internet概念,星际互联网(IPN,Inter Planetary Internet)概念应运而生。完善的协议体系是网络节点间实现数据交换的必要保证。深空中长时延、断续连接、高误码率和上下行链路非对称等特性使得传统TCP/IP协议在深空中难以实施。目前主要的星际互联网协议体系有三类:空间IP协议、CCSDS协议和容迟/容断网络协议(DTN,Delay/Disrupt-Tolerant Networking)。空间IP协议和CCSDS协议虽然在传统Internet协议体系的基础上针对深空链路特点做出了相应修改完善,但是仍然存在不同程度的缺陷。本文着重研究DTN协议体系在深空通信场景中的应用。首先分析BP协议和LTP协议在完成数据传输任务中的特点与机制。其次,对BP协议中的CGR路由协议进行了深入的分析,发现目前的CGR路由协议寻找的传输路径虽然能够保证可靠传输,但是传输效率很低。于是从LTP层的segments的传输过程来分析各种链路情况下bundle传输的情况,以bundle传输的delivery time为判断标准,从而设计出在各种链路情况下的最优传输策略,以此作为CGR路由协议选择路径的标准。然后,由于深空中上下行链路的极度不对称,提出bundle聚合的思想来解决这个问题,并且可以将其与CGR路由协议结合在一起,利用CGR路由协议找出的路径来决定bundle聚合的大小。最后,使用MATLAB工具对bundle传输时的重传次进行了仿真,用于计算bundle传输的delivery time;对优化后的bundle传输的delivery time和目前bundle传输的delivery time进行比较;以及bundle聚合所带来的性能提升,并且分析bundle聚合在不同误码率情况下的吞吐量。
[Abstract]:With the launch of the Soviet Union's Moon I satellite in the 1950s, humans entered a new era of deep space exploration. In the 21st century, due to the rapid development of spaceflight-related technology and the demand of economic, political, military and other aspects, various aviation powers have launched huge exploration plans, such as Curiosity in the United States and Chang'e-2 in China, and so on. At the same time, in the future, the amount of data transmitted by deep space communication increases gradually, and the types of service services become more and more complex. Deep space communication needs to be able to provide a large amount of data, all-weather and multi-type data exchange services. For the complicated and changeable communication in deep space, the design idea of spatial IP protocol and CCSDS protocol architecture is used for reference, and the interconnection between different subnets is realized by covering layer. At the same time, through BP protocol (Bundle Protocol) and LTP protocol (Licklider Transmission Protocol), the problem of data transmission in harsh environment is solved perfectly. Facing the special natural environment, referring to the concept of Internet on the ground, the concept of interstellar Internet (IPN,Inter Planetary Internet) emerges as the times require. Perfect protocol system is the necessary guarantee to realize data exchange among network nodes. It is difficult to implement the traditional TCP/IP protocol in deep air due to its long delay, discontinuous connection, high bit error rate (BER) and asymmetry of uplink and downlink. At present, there are three main interstellar Internet protocol systems: space IP protocol, CCSDS protocol and delay tolerant / tolerant network protocol (DTN,Delay/Disrupt-Tolerant Networking). Although the spatial IP protocol and the CCSDS protocol have been modified and perfected according to the characteristics of the deep space link on the basis of the traditional Internet protocol system, there are still some defects in different degrees. This paper focuses on the application of DTN protocol in deep space communication scenarios. Firstly, the characteristics and mechanism of BP protocol and LTP protocol in completing the task of data transmission are analyzed. Secondly, an in-depth analysis of the CGR routing protocol in the BP protocol is carried out. It is found that the transmission path sought by the current CGR routing protocol can guarantee reliable transmission, but the transmission efficiency is very low. Therefore, the transmission process of segments in LTP layer is used to analyze the situation of bundle transmission under various link conditions, and the delivery time of bundle transmission is used as the judging standard, thus the optimal transmission strategy is designed under various link conditions. It is used as the standard of CGR routing protocol to choose the path. Then, due to the extreme asymmetry of the deep air uplink and downlink, the idea of bundle aggregation is proposed to solve this problem, and it can be combined with the CGR routing protocol to determine the size of bundle aggregation by using the path found by the CGR routing protocol. Finally, the re-transmission of bundle transmission is simulated by using MATLAB tool, and the delivery time; transmitted by bundle is calculated to compare the delivery time transmitted by optimized bundle with the delivery time transmitted by bundle at present. And the performance improvement caused by bundle aggregation, and analyze the throughput of bundle aggregation under different bit error rate (BER).
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.04
本文编号：2465371
[Abstract]:With the launch of the Soviet Union's Moon I satellite in the 1950s, humans entered a new era of deep space exploration. In the 21st century, due to the rapid development of spaceflight-related technology and the demand of economic, political, military and other aspects, various aviation powers have launched huge exploration plans, such as Curiosity in the United States and Chang'e-2 in China, and so on. At the same time, in the future, the amount of data transmitted by deep space communication increases gradually, and the types of service services become more and more complex. Deep space communication needs to be able to provide a large amount of data, all-weather and multi-type data exchange services. For the complicated and changeable communication in deep space, the design idea of spatial IP protocol and CCSDS protocol architecture is used for reference, and the interconnection between different subnets is realized by covering layer. At the same time, through BP protocol (Bundle Protocol) and LTP protocol (Licklider Transmission Protocol), the problem of data transmission in harsh environment is solved perfectly. Facing the special natural environment, referring to the concept of Internet on the ground, the concept of interstellar Internet (IPN,Inter Planetary Internet) emerges as the times require. Perfect protocol system is the necessary guarantee to realize data exchange among network nodes. It is difficult to implement the traditional TCP/IP protocol in deep air due to its long delay, discontinuous connection, high bit error rate (BER) and asymmetry of uplink and downlink. At present, there are three main interstellar Internet protocol systems: space IP protocol, CCSDS protocol and delay tolerant / tolerant network protocol (DTN,Delay/Disrupt-Tolerant Networking). Although the spatial IP protocol and the CCSDS protocol have been modified and perfected according to the characteristics of the deep space link on the basis of the traditional Internet protocol system, there are still some defects in different degrees. This paper focuses on the application of DTN protocol in deep space communication scenarios. Firstly, the characteristics and mechanism of BP protocol and LTP protocol in completing the task of data transmission are analyzed. Secondly, an in-depth analysis of the CGR routing protocol in the BP protocol is carried out. It is found that the transmission path sought by the current CGR routing protocol can guarantee reliable transmission, but the transmission efficiency is very low. Therefore, the transmission process of segments in LTP layer is used to analyze the situation of bundle transmission under various link conditions, and the delivery time of bundle transmission is used as the judging standard, thus the optimal transmission strategy is designed under various link conditions. It is used as the standard of CGR routing protocol to choose the path. Then, due to the extreme asymmetry of the deep air uplink and downlink, the idea of bundle aggregation is proposed to solve this problem, and it can be combined with the CGR routing protocol to determine the size of bundle aggregation by using the path found by the CGR routing protocol. Finally, the re-transmission of bundle transmission is simulated by using MATLAB tool, and the delivery time; transmitted by bundle is calculated to compare the delivery time transmitted by optimized bundle with the delivery time transmitted by bundle at present. And the performance improvement caused by bundle aggregation, and analyze the throughput of bundle aggregation under different bit error rate (BER).
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.04
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