SCMA-Q-learning with overload control for random access in LEO satellite mMTC networks

IF 2.2 4区计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Physical Communication Pub Date : 2025-04-01 Epub Date: 2024-12-31 DOI:10.1016/j.phycom.2024.102584

Zeyu Wu , Guoliang Jing , Jie Ding , Xu Zhao

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Abstract

With the continuous advancement of 5G and beyond wireless networks, the exponential increase in Machine-Type Communication (MTC) devices presents substantial challenges, particularly in deal with Random Access Channel (RACH) congestion in massive MTC (mMTC) networks. Low Earth Orbit (LEO) satellite communication networks are increasingly valued for their global coverage and low-latency benefits. This paper deals with the RACH congestion problem in LEO satellite networks by proposing an innovative method that combines Sparse Code Multiple Access (SCMA), Q-learning, and Access Class Barring (ACB) technology. The proposed approach allows MTC devices to dynamically optimize resource allocation by selecting the most appropriate codebooks and time-slot groups in response to environmental changes. Additionally, ACB is employed to control system overload by adjusting the access probability of devices based on network conditions. Simulation results show that the proposed SCMA-QL-ACB method significantly improves system throughput and reduces collisions compared to existing techniques.

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LEO卫星mMTC网络随机接入的scma - q学习过载控制

随着5G及以后无线网络的不断发展，机器类型通信（MTC）设备的指数级增长带来了巨大的挑战，特别是在处理大规模MTC （mMTC）网络中的随机接入信道（RACH）拥塞时。低地球轨道（LEO）卫星通信网络因其全球覆盖和低延迟优势而日益受到重视。针对低轨道卫星网络中的RACH拥塞问题，提出了一种结合稀疏码多址（SCMA）、q -学习和接入类限制（ACB）技术的创新方法。该方法允许MTC设备根据环境变化选择最合适的码本和时隙组来动态优化资源分配。此外，ACB还可以根据网络情况调整设备的访问概率，从而控制系统过载。仿真结果表明，与现有技术相比，所提出的SCMA-QL-ACB方法显著提高了系统吞吐量，减少了碰撞。

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来源期刊

Physical Communication ENGINEERING, ELECTRICAL & ELECTRONICTELECO-TELECOMMUNICATIONS

CiteScore

5.00

自引率

9.10%

发文量

212

审稿时长

55 days

期刊介绍： PHYCOM: Physical Communication is an international and archival journal providing complete coverage of all topics of interest to those involved in all aspects of physical layer communications. Theoretical research contributions presenting new techniques, concepts or analyses, applied contributions reporting on experiences and experiments, and tutorials are published. Topics of interest include but are not limited to: Physical layer issues of Wireless Local Area Networks, WiMAX, Wireless Mesh Networks, Sensor and Ad Hoc Networks, PCS Systems; Radio access protocols and algorithms for the physical layer; Spread Spectrum Communications; Channel Modeling; Detection and Estimation; Modulation and Coding; Multiplexing and Carrier Techniques; Broadband Wireless Communications; Wireless Personal Communications; Multi-user Detection; Signal Separation and Interference rejection: Multimedia Communications over Wireless; DSP Applications to Wireless Systems; Experimental and Prototype Results; Multiple Access Techniques; Space-time Processing; Synchronization Techniques; Error Control Techniques; Cryptography; Software Radios; Tracking; Resource Allocation and Inference Management; Multi-rate and Multi-carrier Communications; Cross layer Design and Optimization; Propagation and Channel Characterization; OFDM Systems; MIMO Systems; Ultra-Wideband Communications; Cognitive Radio System Architectures; Platforms and Hardware Implementations for the Support of Cognitive, Radio Systems; Cognitive Radio Resource Management and Dynamic Spectrum Sharing.