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With the gradual formation of rail transit networks in major cities, there are more and more transfer stations, especially the three-line transfer stations. In view of the complexities and particularities of the actual conditions of the first three-line transfer station project in Xi'an metro, the frequency planning, distribution and coverage scheme of the wireless system are described relying on the TETRA system design of Fangzhicheng Station. By investigating and analyzing the frequency distribution of existing lines, 5 sets of frequencies are used for wireless coverage of stations, which ensures the frequency interval and avoids same-frequency interference. In Fangzhichen Parking Lot with overlaying property development, directional antenna is adopted to replace the roof omnidirectional antenna coverage mode and avoid signal interference to the adjacent existing parking lot. Through on-site investigation and analysis of different coverage areas such as common station hall, station platform, railway track area and independent side platform, the spatial propagation path and various disturbance factor losses are determined, and different calculation models are used to calculate the indoor distribution coverage field strength. The existing common station hall and station platform are covered by wireless signal combination scheme, the railway track area of the station is covered by two leaking cables laid in the middle partition wall, and the area of independent side platform is covered by indoor antenna reinforcement scheme. The above wireless system coverage scheme not only reduces the system interference and impact on existing stations, but also avoids the repetitive construction of indoor antennas and cuts down capital investment. [ABSTRACT FROM AUTHOR]

For the interference problems in frequency sharing and geographical coexistence between 5G base stations and the adjacent frequency systems such as satellite earth stations, the different situations consisting of the interferences to 5G base stations and the interferences to other stations were analyzed, and the solutions to improve interference positioning efficiency including analyzing the same frequency signal using real-time spectrum function, identifying the signal using 5G NR demodulation function, and locating the interference source combined with same-frequency multiple radio source positioning method were presented.

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Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)