| In recent years, with the rapid development of China’s aerospace, constructing theSky-Space-Ground Integrated Tracking Telemetering (TTC)&Command andCommunication Network (also named Unified Information Network (UIN)) has beenmore and more urgent. Because this network can solve the problems of:①the wholejourney TTC and navigation of areocrafts,②the repeated construction, low utilizationand less information of space resource,③the space remote sensing large amount datatransmission, especially the real-time transmission,④the global coverage of mobilecommunication,⑤the deep space probe and relay;⑥the aviation information subnet,etc. As we can see, it is very important to construct and develop UIN in our country.At present, General Armament Department, General Staff Headquarters, ChineseAcademy of Engineering and National Natural Science Foundation of China, etc, hasbeen researching UIN, which is a huge engineering, and needs enriching manytechnologies.Under this environment, this paper focus on Space CommunicationProtocol Specification-Transport Protocol (SCPS-TP), which is based on ChineseAcademy of Engineering’s consulting project “Study on the constructing of SpaceInformation Networks (SIN)” and Xi’an Branch of China Academy of SpaceTechnology’s project “Study on Integrated Space-Sky-Ground TTC and Communications”. The main work of this paper is shown as follows:①We point out the practical significance of SCPS-TP. It is the need of space datacommunitioncommunication, the integration with developd developed countries as wellas the transformation and application SCPS, also the construction of independent selfUIN.②We assist our tutor to propose a space information network architecture basedon Wired Equivalent Network (WEN), including Space Local Area Network (SLAN),Space Wide Area Network (SWAN), and handoff protocol. WEN builds networks byregion, orbit and function of the areocraft. These aerocrafts are physically connectedthrough wireless links. However, in a certain time and under certain conditions, WENcan be seen as a long with several tens of thousands of kilometers of fiber optic cable orthe cable, flexible (or elastic) connected to a wired network.③We comprehensively elaborate the characteristics of SCPS-TP. SCPS-TP hasmany differences with ground wireless network TCP, such as error bit rate, round-trip delay, continuity,forward and reverse link capacity, CPU and memory capacity,communication goals, and reason of data loss, etc. Considering the differences inenvironment, we make some improvements based on ground TCP, which formsSCPS-TP. Moreover, we also independently translate and sort out SCPS-TP blue book(you can find it in Attachment).④We study the MITRE Inc.’s SCPS-TP source code, and introduce thebackground of this project, the organization of code and the introduction of the mainfiles. Then, we analyse the SCPS’s key functions and give the operation manual. Finally,the source code is verified by laboratory test bed.⑤By introducing a terrestrial wireless communication technology, TransportControl Protocol/Netwrok Coding (TCP/NC), which can improve the throughputeffectively, we detailedly describe its theory foundation and concrete operating process,and deduce the throughput by math modeling. At last, the simulation results verifyTCP/NC’s effectiveness.⑥Combing with the characteristics of SCPS-TP and advantages of terrestrialTCP/NC, a modified TCP/NC—SCPS-TP/NC, which can be used in space datacommunication, is proposed. We give a detailed process of this algorithm, and setup asimulation platform based on Network Simulator2(NS2). In NS2, we newly addSCPS-TP and NC protocols. SCPS-TP/NC can effectively improve the system end toend throughput by simulations.Compared to terrestrial wireless communications, the verification of spacecommunication protocol is much more difficult. So, most of our current work dependson theoretical derivation and laboratory simulation, while much practical work still needto be implemented in future work. |
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