面向空間差錯(cuò)信道的LTP協(xié)議優(yōu)化
發(fā)布時(shí)間：2019-04-25 18:56
【摘要】：隨著上世紀(jì)50年代前蘇聯(lián)的“月球一號(hào)”衛(wèi)星發(fā)射,人類進(jìn)入了深空探測(cè)的新時(shí)代。進(jìn)入21世紀(jì)以來,由于航天相關(guān)技術(shù)的快速發(fā)展與經(jīng)濟(jì)政治軍事等方面的需求,各個(gè)航空大國(guó)紛紛推出龐大的探測(cè)計(jì)劃,例如美國(guó)“好奇號(hào)”和中國(guó)的“嫦娥二號(hào)”等。與此同時(shí),未來深空通信傳輸數(shù)據(jù)量逐漸增加、服務(wù)業(yè)務(wù)種類愈發(fā)復(fù)雜,深空通信需要能夠提供大數(shù)據(jù)量、全天候和多類型的數(shù)據(jù)交換服務(wù)。面向深空復(fù)雜多變的通信借鑒了空間IP協(xié)議和CCSDS協(xié)議體系的設(shè)計(jì)思想,通過覆蓋層實(shí)現(xiàn)不同子網(wǎng)間互通互聯(lián),同時(shí)主要通過BP協(xié)議(Bundle Protocol)和LTP協(xié)議(Licklider Transmission Protocol)較為完善地解決了數(shù)據(jù)在惡劣環(huán)境下的傳輸問題。面對(duì)特殊的自然環(huán)境,借鑒地面Internet概念,星際互聯(lián)網(wǎng)(IPN,Inter Planetary Internet)概念應(yīng)運(yùn)而生。完善的協(xié)議體系是網(wǎng)絡(luò)節(jié)點(diǎn)間實(shí)現(xiàn)數(shù)據(jù)交換的必要保證。深空中長(zhǎng)時(shí)延、斷續(xù)連接、高誤碼率和上下行鏈路非對(duì)稱等特性使得傳統(tǒng)TCP/IP協(xié)議在深空中難以實(shí)施。目前主要的星際互聯(lián)網(wǎng)協(xié)議體系有三類:空間IP協(xié)議、CCSDS協(xié)議和容遲/容斷網(wǎng)絡(luò)協(xié)議(DTN,Delay/Disrupt-Tolerant Networking)�？臻gIP協(xié)議和CCSDS協(xié)議雖然在傳統(tǒng)Internet協(xié)議體系的基礎(chǔ)上針對(duì)深空鏈路特點(diǎn)做出了相應(yīng)修改完善,但是仍然存在不同程度的缺陷。本文著重研究DTN協(xié)議體系在深空通信場(chǎng)景中的應(yīng)用。首先分析BP協(xié)議和LTP協(xié)議在完成數(shù)據(jù)傳輸任務(wù)中的特點(diǎn)與機(jī)制。其次,對(duì)BP協(xié)議中的CGR路由協(xié)議進(jìn)行了深入的分析,發(fā)現(xiàn)目前的CGR路由協(xié)議尋找的傳輸路徑雖然能夠保證可靠傳輸,但是傳輸效率很低。于是從LTP層的segments的傳輸過程來分析各種鏈路情況下bundle傳輸?shù)那闆r,以bundle傳輸?shù)膁elivery time為判斷標(biāo)準(zhǔn),從而設(shè)計(jì)出在各種鏈路情況下的最優(yōu)傳輸策略,以此作為CGR路由協(xié)議選擇路徑的標(biāo)準(zhǔn)。然后,由于深空中上下行鏈路的極度不對(duì)稱,提出bundle聚合的思想來解決這個(gè)問題,并且可以將其與CGR路由協(xié)議結(jié)合在一起,利用CGR路由協(xié)議找出的路徑來決定bundle聚合的大小。最后,使用MATLAB工具對(duì)bundle傳輸時(shí)的重傳次進(jìn)行了仿真,用于計(jì)算bundle傳輸?shù)膁elivery time;對(duì)優(yōu)化后的bundle傳輸?shù)膁elivery time和目前bundle傳輸?shù)膁elivery time進(jìn)行比較;以及bundle聚合所帶來的性能提升,并且分析bundle聚合在不同誤碼率情況下的吞吐量。
[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).
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN915.04
本文編號(hào)：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).
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN915.04
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