基于多路径传输的城市轨道交通带宽聚合
胡传搏1刘小勇2邹劲柏1刘虎1王森3
Bandwidth Aggregation for Urban Rail Transit Based on Multi-path Transmission
HU Chuanbo1LIU Xiaoyong2ZOU Jinbai1LIU Hu1WANG Sen2
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作者信息:1.上海应用技术大学轨道交通学院，201418，上海
2.国家无线电监测中心检测中心（无线电频谱检测技术工业和信息化部重点实验室），100041，北京
3.上海申通地铁集团有限公司技术中心，201103，上海
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Affiliation:1.Shanghai Institute of Technology School of Rail Transportation, 201418, Shanghai, China
2.The National Radio Monitoring Center Testing Centre (Key Laboratory of Rad Radio Spectrum Monitoring Technology, Ministry of Industry and Information Technology), 100041, Beijing, China
3.Technology Centre of Shanghai Shentong Metro Group Co., Ltd., 201103, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.03.054
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中图分类号/CLCN:U285.21
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栏目/Col:应用技术
摘要:
［目的］城市轨道交通广泛采用LTE-M(地铁长期演进)系统，以支持多种业务。但随着视频业务数据量的快速增长，该系统面临带宽压力，需设计一种适应城市轨道交通网络环境的多路径传输系统，以达到聚合多网络带宽的目的。［方法］基于MPQUIC(多路径快速用户数据报网络连接)协议设计了一种动态冗余的城市轨道交通多路径传输系统，该系统采用两种传输模式：在常规模式下，为缩短路径间完成传输的时间差异，使用基于预分配数据包的多路径调度算法，降低网络异构性对传输性能的影响，以适应异构网络环境；在越区切换发生时，为了克服移动场景下越区切换造成的网络波动对传输性能的影响，从信令层面进行并行调度与冗余调度切换的判决，并及时转换为冗余传输，以保证切换发生时传输性能的稳定。介绍了该系统的设计及其调度算法的设计，并通过仿真试验进行了验证。［结果及结论］在模拟的城市轨道交通网络场景中，基于冗余和预分配的多路径调度方法相比最低RTT(往返时延)优先调度方法，在较好和较差的网络条件下，网络的平均吞吐量分别提升了28.7%和33.9%的，验证了所设计的动态冗余的城市轨道交通多路径传输系统的有效性和优越性。
Abstracts:
［Objective］ Urban rail transit widely adopts the LTE-M (long-term evolution for metro) system to support various services. However, with the rapid growth of video data traffic, the system faces increasing bandwidth pressure. To address this challenge, a multi-path transmission system tailored to the urban rail transit network environment needs to be designed to aggregate multiple network bandwidths. ［Method］ Based on the MPQUIC (multipath quick UDP (user datagram protocol) internet connections) protocol, a dynamic redundancy-based multi-path transmission system for urban rail transit is designed. The system incorporates two transmission modes. Under regular conditions, to minimize time differences in data transmission across paths, a pre-allocated packet-based multi-path scheduling algorithm is used. This approach mitigates the impact of network heterogeneity on transmission performance, making it more adaptable to heterogeneous network environments. Under cross-section handover conditions, to address the challenge of network fluctuations in mobility scenario caused by cross-section handover degrading transmission performance, the system determines switching between parallel scheduling and redundant scheduling at the signaling level, transitioning to redundant transmission in time to ensure stable performance during handover. The system architecture and scheduling algorithm design are introduced, and simulation experiments are conducted for validation. ［Result & Conclusion］ In simulated urban rail transit network scenarios, the proposed multi-path scheduling methods—combining redundancy and pre-allocation—demonstrates superior performance compared to the lowest RTT (round trip time) priority scheduling method. Under both favorable and poor network conditions, the average network throughput increases by 28.7% and 33.9%, respectively, validating the effectiveness and superiority of the designed dynamic redundancy-based multi-path transmission system for urban rail transit.
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