Special Issue:Frontier Technologies of Satellite Internet

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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Space-Integrated-Ground Information Networks    2022, 3 (1): 1-1.   DOI: 10.11959/j.issn.2096-8930.2022001-1 Abstract （124）   HTML （35）    PDF（pc） （545KB）（446）       Knowledge map    Save Reference | Related Articles | Metrics Select Massive MIMO LEO Satellite Communications System Kexin LI, Li YOU, Xiqi GAO Space-Integrated-Ground Information Networks    2022, 3 (1): 2-8.   DOI: 10.11959/j.issn.2096-8930.2022001 Abstract （696）   HTML （96）    PDF（pc） （674KB）（704）       Knowledge map    Save Extending massive multiple-input multiple-output (MIMO) technique to low earth orbit (LEO) satellite communication systems enables satellites to implement fl exible beamforming, which can make full use of the spatial degrees of freedom of massive MIMO and signifi cantly improve the spectral effi ciency and energy effi ciency of LEO satellite communication systems.Several related issues in massive MIMO-based LEO satellite communication systems were studied.The characteristics of massive MIMO LEO satellite channels were analyzed.The important diff erences between them and terrestrial wireless channels were revealed.With the aim of addressing the problems on channel information acquisition, multi-user transmission and user scheduling in massive MIMO LEO satellite communication, the main difficulties faced by the current work were discussed, and how to use the characteristics of massive MIMO LEO satellite channels to design tailored solutions with low implement complexity was conceived. Reference | Related Articles | Metrics Select User Random Access Technology Based on Beam Hopping Satellite Communication System Zixuan HUANG, Jiaxi ZHOU, Jing ZHANG, Zhengyu ZHANG Space-Integrated-Ground Information Networks    2022, 3 (1): 9-17.   DOI: 10.11959/j.issn.2096-8930.2022002 Abstract （301）   HTML （40）    PDF（pc） （2463KB）（219）       Knowledge map    Save On the basis of geosynchronous earth orbit multi-beam satellite communication systems, this paper designed the process of user random access to the network and specifi c signaling interaction under the agile beam mechanism, and proposed the scheduling strategy and allocation scheme of the agile signaling beam.This scheme increased the fl exibility of access resource allocation under the premised of ensured that all users could accessed the network, eff ectively improved the utilization rate of satellite network resources.The request of user access to the satellite communication network belongs to the burst type, it is more suitable to use the random competition access, so this paper based on the general random competition access strategy, proposed an adaptive random competition access algorithm based on the heat value, based on the heat value predicted by the network side, the user selects diff erent random access strategies for access.Through the simulation and analysis of the optimization algorithm, it is proved that the algorithm could eff ectively reduced the probability of access collision under various network loads, so as to achieved the purpose of users quickly accessing the network. Table and Figures | Reference | Related Articles | Metrics Select Beam Hopping Beam Optimization and Resource Allocation Algorithm Based on Phased Array Mengting HAO, Chen ZHANG, Gengxin ZHANG Space-Integrated-Ground Information Networks    2022, 3 (1): 18-26.   DOI: 10.11959/j.issn.2096-8930.2022003 Abstract （403）   HTML （62）    PDF（pc） （1924KB）（500）       Knowledge map    Save Beam hopping technology can provide enough fl exibility and high resource utilization for satellite communication system, and shows good performance in broadband satellite communication system.However, the existing beam planning scheme of beam hopping technology is relatively fi xed and can not change with the change of service demand characteristics.For the situation of uneven distribution of user demand and scattered location, the advantages of beam hopping technology are diffi cult to play.To solve the above problems, a beam optimization method was proposed, which used the agility characteristics of phased array antenna to adjusted the size of beam according to the characteristics of service distribution, so as to made the service demand in each beam more balanced.On this basis, from the perspective of matching the demand with the actual transmission capacity, the minimization n-order diff erence objective function was established, the time slot resources allocated in each beam were solved by convex optimization algorithm, and the overall satisfaction and system delay of the system before and after beam optimization were compared.The simulation results showed that compared with the traditional beam planning scheme, the algorithm could improved the overall satisfaction of the system, reduced the system delay and improved the access success rate of the users. Table and Figures | Reference | Related Articles | Metrics Select Large Scale LEO Satellite Internet Routing Algorithm Based on Load Balancing Yijie WANG, Wei ZHAO, Fei CHENG, Wen CHEN, Anjie CAO Space-Integrated-Ground Information Networks    2022, 3 (1): 27-34.   DOI: 10.11959/j.issn.2096-8930.2022004 Abstract （562）   HTML （60）    PDF（pc） （1287KB）（548）       Knowledge map    Save The expanding market demand has set off an upsurge of large-scale LEO constellation deployment.With the characteristics of large bandwidth, low delay and continuous coverage, it provides broadband internet services for users all over the world.Aiming at the problem of congestion and packet loss caused by uneven network load, an adaptive large-scale LEO inter satellite routing algorithm based on load balancing was proposed.The algorithm divided the direction and level of candidate satellites according to the information obtained from small area detection, calculated the weight value according to diff erent partition results, and selected the next hop node with the highest level and the lowest weight value, carry out the same steps hop by hop until the data reaches the destination satellite node, fi nally formed a low delay path to realized low packet loss rate data transmission in the whole network.Through the simulation experiment, compared with the classical algorithm and the existing large-scale LEO satellite routing algorithm, the routing algorithm could eff ectively improved the routing performance of LEO large-scale satellite communication network and provided high-quality services for users. Table and Figures | Reference | Related Articles | Metrics Select Multilayer Satellite Network Dynamic Access Technology Yunhan LI, Jianpeng MA, Xiongwen HE, Shun ZHANG, Hongyan LI Space-Integrated-Ground Information Networks    2022, 3 (1): 35-43.   DOI: 10.11959/j.issn.2096-8930.2022005 Abstract （309）   HTML （42）    PDF（pc） （1667KB）（322）       Knowledge map    Save Using the characteristics of satellites in diff erent orbits to build a more effi cient multilayer satellite network has become a hotspot in satellite network research in recent years.Traditional satellite network access methods have been unable to meet the needs of multilayer satellite networks with low latency and fl exible access, so it is urgent to design an effi cient random dynamic access protocol for multilayer satellite networks.This paper fi rst summarized the traditional satellite network access technology, clarifi ed the development context of the satellite network random access protocol, and then proposed diff erent low latency for the two diff erent scenarios of ground station access to satellite and multilayer satellite network intersatellite access.The access method could provided a reference for the development of the dynamic access technology of the multilayer satellite network in the future. Table and Figures | Reference | Related Articles | Metrics Select Research on Resource Allocation of Satellite Internet Service Function Based on SDN/NFV Meilin XU, Min JIA, Qing GUO Space-Integrated-Ground Information Networks    2022, 3 (1): 44-49.   DOI: 10.11959/j.issn.2096-8930.2022006 Abstract （348）   HTML （68）    PDF（pc） （1619KB）（528）       Knowledge map    Save Software-defined networks and network function virtualization can effectively solve the problems of difficult management and control of large-scale networks and diffi culties in resource scheduling.Applying the software-defi ned network architecture model and network function virtualization technologies to the large-scale satellite internet can eff ectively solve some problems.This paper proposed a new SDN/NFV-based new satellite internet architecture, different satellite domains could be responsibled for different functions, inter-satellite and inter-domain could used SDN and NVF for eff ective collaboration, effi cient used of network resources, research and optimization of its service function resource allocation technology after VNF deployment, a simulated annealing algorithm based on resource awareness was proposed.Simulation results showed that this algorithm could effectively reduced the end-to-end delay and bandwidth consumption of SFC data fl ow during transmission, and could provided users with better services. Table and Figures | Reference | Related Articles | Metrics Select Research Prospect of Anti-Jamming Strategy for the Satellite Internet Chen HAN, Aijun LIU, Kang AN Space-Integrated-Ground Information Networks    2022, 3 (1): 50-55.   DOI: 10.11959/j.issn.2096-8930.2022007 Abstract （386）   HTML （58）    PDF（pc） （868KB）（773）       Knowledge map    Save As an important infrastructure of the national information system, the satellite internet is of great signifi cance to the national security.Thus, it needs to ensure the validity and reliability of the data transmission in the hostile jamming environment.The threat of smart jamming and the limitation of classical link-layer anti-jamming methods give rise to the new demand of intelligent and networked antijamming solutions.In view of the structural characteristics of the satellite internet and the development trend of modern communication jamming technologies, this paper analyzed the basic architecture of intelligent and networked anti-jamming.Based on the closed-loop strategic of sense-learn-prediction-decision-feedback, intelligent and active anti-jamming decision was made to realized self-confi guration and self-optimization.Based on the cooperative communication between nodes, networked anti-jamming ability was improved by the means of topology control and reconstruction, adjacent resources reallocation, and traffi c load balancing.It provided certain theoretical support for the construction of anti-jamming strategy system to achieved the cross-layer optimization, multi-domain combination, and adaptive intelligence. 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