基于LTE-M技术改造既有地铁信号专用无线通信系统的研究

Research on Transforming the Special Wireless Communication System for the Existing Metro Signal Based on the LTE-M Technology

随着地铁范围内2.4 GHz公用频段无线产品的大量使用,地铁信号无线通信环境干扰加剧,为进一步提升地铁运营的稳定性和可靠性,基于LTE-M技术在地铁无线传输中的应用优势,对既有地铁信号专用无线通信系统进行改造研究。以实际线路为例,设计整体方案;围绕频率规划、时钟同步、无线覆盖等方面细化子方案;结合前期技术规划进行分步调试、双网倒切等方案实施。研究及实践结果表明,将既有地铁信号无线通信系统WLAN技术改造为LTEM技术可行有效,且LTE-M与WLAN可兼容并行,解决了原有无线通信系统受干扰的问题,也为后续地铁既有线同类改造项目提供了借鉴与参考。

With the widespread use of 2.4 GHz public band wireless products and increasing interference in metro line wireless communication,the transformation of the existing metro wireless communication system for the signaling system is studied in order to enhance the stability and reliability of metro line operation.Leveraging the advantages of LTE-M technology,a comprehensive scheme,including frequency planning,clock synchronization and wireless coverage,has been designed and tested on an actual line.The schemes such as step-by-step debugging and double-network switching are implemented in combination with the previous technical planning.The results indicate that transitioning from WLAN technology to LTE-M technology is both feasible and effective,and both the technologies can be compatible with each other and achieve parallel applications.This approach resolves interference issues and offers insights for similar transformation projects in other existing metro lines.