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dynamic channel reservation scheme based on priorities in LEO satellite systems

Journal of Systems Engineering and Electronics 2015年第1期26卷 1-9页

作者： Jian Zhou Xiaoguo Ye Yong Pan Fu Xiao Lijuan Sun College of Computer Nanjing University of Posts and Telecommunications

According to low earth orbit（LEO） satellite systems with users of different levels, a dynamic channel reservation scheme based on priorities is proposed. dynamic calculation of the thresholds for reserved channels is the key of this strategy. In order to obtain the optimal thresholds, the traffic is predicted based on the high-speed deterministic movement property of LEO satellites firstly. Then, a channel allocation model based on Markov is established. Finally, the solution of the model is obtained based on the genetic algorithm. Without user location, this strategy effectively reduces handover failures and improves channel utilization by adjusting dynamically the thresholds according to traffic conditions. The simulation results show that the system＇s overall quality of service can be improved by this strategy.

关键词： dynamic channel reservation priority handover different level user low earth orbit(LEO)

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Learning-Based Admission Control for Low-Earth-Orbit Satellite Communication Networks

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中兴通讯技术:英文版 2023年第3期21卷 54-62页

作者： CHENG Lei QIN Shuang FENG Gang University of Electronic Science and Technology of China Chengdu 611731China

Satellite communications has been regarded as an indispensable technology for future mobile networks to provide extremely high data rates,ultra-reliability,and ubiquitous ***,the high dynamics caused by the fast movement of low-earth-orbit(LEO)satellites bring huge challenges in designing and optimizing satellite communication ***,admission control,deciding which users with diversified service requirements are allowed to access the network with limited resources,is of paramount importance to improve network resource utilization and meet the service quality requirements of *** this paper,we propose a dynamic channel reservation strategy based on the Actor-Critic algorithm(AC-DCRS)to perform intelligent admission control in satellite *** carefully designing the longterm reward function and dynamically adjusting the reserved channel threshold,AC-DCRS reaches a long-run optimal access policy for both new calls and handover calls with different service *** results show that our proposed AC-DCRS outperforms traditional channel reservation strategies in terms of overall access failure probability,the average call success rate,and channel utilization under various dynamic traffic conditions.

关键词： satellite communications admission control dynamic channel reservation actor-critic

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