5G digital repeater applied to mobile train

Abstract

The utility model discloses a 5G digital repeater applied to a mobile train. The 5G digital repeater comprises a near-end machine, a plurality of switching cascade units and a plurality of far-end transmitting units, and the far-end transmitting unit converts a downlink digital signal issued by the near-end machine or the switching cascade unit into a radio-frequency signal, and transmits a received uplink terminal radio-frequency signal to the switching cascade unit or the near-end machine through digital processing, so that 5G signal coverage of a carriage is realized. According to the utility model, the internal coverage of a train is improved, signal fading caused by train carriages to signals is reduced, and the user experience is improved; the public network base stations along the railway mainly serve the train users, and by using the technology, the base station laying along the railway can be reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of 5G, and particularly relates to a 5G digital repeater applied to a moving train. Background Art

[0002] According to 3GPP, "YD / T 3633-2020 Technical Requirements and Test Methods for Digital Cellular Mobile Communication Network Repeaters of TD-LTE" and "YD / T 3634-2020 Technical Requirements and Test Methods for Digital Cellular Mobile Communication Network Repeaters of LTE FDD":

[0003] As the 5G frequency band gets higher and higher, the signal transmission of macro base stations faces greater link loss problems, and the indoor signal coverage is insufficient. On the one hand, the higher 5G frequency band makes it difficult for outdoor macro base station signals to reach indoors, and on the other hand, more and more services and traffic demands occur indoors. Simply increasing the coverage of macro base stations is unaffordable in terms of cost. Therefore, 5G repeater products provide a new solution for achieving 5G deep coverage. Currently, 5G repeater products in the domestic market mainly form indoor coverage for building bodies such as elevators, basement parking lots, and small-area offices.

[0004] However, the train coverage problem has not been effectively solved. The current 5G repeaters on the market are repeaters that are fiber-optically remote from the 5G BBU and only cover fixed indoor areas. Trains are in a high-speed moving state and cannot be fiber-optically remote, so the business and traffic demands of train customers have not been solved. Summary of the Utility Model

[0005] The utility model provides a 5G digital repeater applied to a moving train, which can effectively solve the problem of poor 5G signal coverage inside the carriage, as well as solve the problem of over-dense base station distances for public network coverage along high-speed railways, reduce construction costs, reduce the difficulty of network optimization, and reduce the later network operation and maintenance costs, and has certain advantages in the user experience of taking high-speed trains.

[0006] A 5G digital repeater applied to a moving train includes:

[0007] A proximal unit, connected to the train antenna;

[0008] A plurality of switching cascade units, connected to the proximal unit and respectively installed in a plurality of train carriages; and

[0009] A plurality of distal transmitting units, respectively installed in a plurality of train carriages and connected to the switching cascade unit in the same carriage;

[0010] Wherein, the switching cascade unit has an expansion module;

[0011] The remote transmission unit converts the downlink digital signal sent by the proximal unit or the switching cascade unit into a radio frequency signal, and at the same time sends the received uplink terminal radio frequency signal to the switching cascade unit or the proximal unit after digital processing, realizing 5G signal coverage in the carriage.

[0012] The proximal unit is connected to at least one switching cascade unit through a CPRI interface.

[0013] The switching cascade unit connected to the proximal unit is connected to at least one switching cascade unit through an expansion module.

[0014] Preferably, the proximal unit, multiple switching cascade units and multiple remote transmission units form a tree topology structure.

[0015] Preferably, it further includes a network management unit, which is connected to at least the proximal unit. The network management unit is used to monitor and manage the proximal unit, the switching cascade unit and the remote transmission unit, and uploads to the network management server through the 5G wireless network.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: the present utility model improves the coverage inside the train, reduces the signal fading caused by the train carriage to the signal, and improves the user experience;

[0017] The public network base stations along the railway mainly serve train users. Using this technology can reduce the construction of base stations along the railway and reduce the construction cost. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a 5G digital repeater;

[0019] Figure 2 It is a structural diagram of a 5G digital repeater applied to a moving train.

[0020] Description of the Reference Numerals:

[0021] 1 - Proximal unit, 2 - Switching cascade unit, 3 - Remote transmission unit, 4 - Train antenna. Detailed Embodiment

[0022] The following combines the drawings to describe in detail a specific embodiment of the present utility model, but it should be understood that the protection scope of the present utility model is not limited by the specific embodiment.

[0023] As Figures 1 to 2 shown, a 5G digital repeater applied to a moving train provided by an embodiment of the present utility model includes the following parts:

[0024] 1) Proximal unit 1: An access device for single - mode or multi - mode radio frequency extended signals, which converts its signal into an optical signal through data processing and sends it to the multi - path switching cascade unit 2 or pRU;

[0025] 2) Switching and Cascade Unit 2 (EU): A cascade expansion node for data transmission, which distributes the digital signals of the proximal unit 1 and can realize the extended transmission of multiple expansion paths, and transmits the 5G public network base station source signal to different pRUs;

[0026] 3) Remote Transmitting Unit 3 (pRU): Converts the downlink digital signal sent by the proximal unit 1 or the switching and cascade unit 2 into a radio frequency signal, and at the same time sends the received uplink terminal radio frequency signal to the switching and cascade unit 2 or the proximal unit 1 through digital processing to achieve 5G signal coverage in the carriage;

[0027] 4) Network Management Unit: It is necessary to remotely monitor and manage the in-vehicle repeater system and the devices connected to the in-vehicle repeater, and upload them to the network management server through the 5G wireless network;

[0028] Among them, the proximal unit 1 is connected to the train antenna 4;

[0029] Multiple switching and cascade units 2 are connected to the proximal unit 1 and are respectively installed in multiple train carriages;

[0030] Multiple remote transmitting units 3 are respectively installed in multiple train carriages and are connected to the switching and cascade unit 2 in the same carriage;

[0031] Among them, the switching and cascade unit 2 has an expansion module;

[0032] The remote transmitting unit 3 converts the downlink digital signal sent by the proximal unit 1 or the switching and cascade unit 2 into a radio frequency signal, and at the same time sends the received uplink terminal radio frequency signal to the switching and cascade unit 2 or the proximal unit 1 through digital processing to achieve 5G signal coverage in the carriage.

[0033] The proximal unit 1 is connected to at least one switching and cascade unit 2 through the CPRI interface; the switching and cascade unit 2 connected to the proximal unit 1 is connected to at least one switching and cascade unit 2 through the expansion module;

[0034] The proximal unit 1, multiple switching and cascade units 2 and multiple remote transmitting units 3 form a tree topology.

[0035] The coverage distance of the vehicle body shielding base station is limited and can penetrate within 200 meters of the railway line; the smaller the signal incident angle, the greater the penetration loss. It is usually recommended that the incident angle be greater than 10 degrees and the station spacing be less than 500 meters.

[0036] Increase the coverage of the in-vehicle repeater: The uplink EIRP increases by 45 dB (transmission loss -30 dB, transmit power increases by 10 dB, antenna gain increases by 6 dB). The distance between the train and the base station is guaranteed to be under 2.5 km to ensure signal quality; high signal-to-noise ratio can achieve high MCS transmission of 256QAM. The repeater sorts out the transmitted and received signals to improve the signal quality of the air interface;

[0037] The vehicle-mounted 5G digital repeater system is mainly applied to high-speed running multiple unit trains. At the proximal unit (MU), multiple groups of antennas on the roof access the public network 5G signal base station, perform multi-mode duplex combining, and after multiple digital processes, transmit through CPRI to multiple covered remote transmitting units 3 and send to the next-level extended unit. The pRU realizes omnidirectional coverage inside the carriage through directional antennas.

[0038] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit and basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A 5G digital repeater for use in a mobile train, characterized in that: include: The near-end unit is connected to the train antenna; A plurality of switching cascade units are connected to the near-end machine and are installed in a plurality of train carriages respectively; as well as A plurality of remote transmitting units are installed in a plurality of train carriages respectively and connected to a switching cascade unit in the same carriage; Wherein, the switching cascade unit has an expansion module; The remote transmitting unit converts the downlink digital signal sent by the near-end unit or the switching cascade unit into a radio frequency signal, and at the same time sends the received uplink terminal radio frequency signal to the switching cascade unit or the near-end unit after digital processing, thereby achieving 5G signal coverage in the car.

2. A 5G digital repeater for use in a mobile train according to claim 1, characterized in that: The near-end machine is connected to at least one switching cascade unit via a CPRI interface.

3. A 5G digital repeater for use in a mobile train according to claim 1, characterized in that: The switching cascade unit connected to the near-end machine is connected to at least one switching cascade unit via an expansion module.

4. A 5G digital repeater for use in a mobile train according to claim 1, characterized in that: The near-end machine, a plurality of switching cascade units and a plurality of remote transmitting units form a tree topology structure.

5. A 5G digital repeater for use in a mobile train according to claim 1, characterized in that: It also includes a network management unit, which is connected to at least the proximal machine. The network management unit is used to monitor and manage the proximal machine, the switching cascade unit and the remote transmitting unit, and upload to the network management server through the 5G wireless network.

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