Rail Transit Wireless Communication System Based on Millimeter Wave Technology

Abstract

This utility model discloses a rail transit wireless communication system based on millimeter-wave technology, implemented at stations, on trains, and on tracks. It includes a BBU trunking module, a track-side millimeter-wave module, a moving train millimeter-wave module, a train RRU array module, and an antenna integration module. The BBU trunking module is located at the station and adopts a C-RAN architecture, centrally deploying the baseband processing unit. The track-side millimeter-wave module is located on the track and connected to the BBU trunking module. The moving train millimeter-wave module is located on the train and connected to the track-side millimeter-wave module. The train RRU array module is located on the train and connected to the moving train millimeter-wave module. The train RRU array module receives signals from the track-side millimeter-wave equipment. The antenna integration module is located on the train and is connected to the antenna integration module via the eCCPRI protocol. This utility model has advantages such as stable transmission and low cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of rail transit communication systems, specifically relating to a rail transit wireless communication system based on millimeter wave technology. Background Technology

[0002] In existing rail transit wireless communication, wireless communication systems based on WLAN (IEEE 802.11 standard) and LTE-M (TD-LTE dedicated frequency band) are commonly used. However, when rail trains are moving at high speeds, existing rail transit wireless communication systems have shortcomings such as insufficient stability, limited anti-interference ability, and small coverage, making it difficult to ensure the stable use of wireless networks in trains and affecting user experience. At the same time, the huge investment in infrastructure restricts the development of wireless communication systems in trains. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a stable rail transit wireless communication system based on millimeter wave technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A rail transit wireless communication system based on millimeter-wave technology, implemented at stations, on trains, and on tracks, includes:

[0006] The BBU cluster module is located at the station and adopts a C-RAN architecture, with baseband processing units centrally deployed.

[0007] The orbital-side millimeter-wave module is located on the orbital side and connected to the BBU cluster module.

[0008] A mobile train millimeter-wave module is installed on the train and connected to the trackside millimeter-wave module.

[0009] The train RRU array module is installed on the train and connected to the mobile train millimeter-wave module. The train RRU array module is used to receive signals from the trackside millimeter-wave equipment.

[0010] And an antenna integration module, which is installed on the train. The train RRU array module is connected to the antenna integration module via the eCCPRI protocol.

[0011] Preferably, it also includes core network equipment, wherein the BBU cluster module is connected to the core network equipment via an Ethernet switch.

[0012] Preferably, the antenna integration module includes a multi-network box and an on-board switch. Both the multi-network box and the on-board switch are installed on the train, and the multi-network box is connected to the on-board switch. The on-board switch is connected to the train's RRU array module.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects:

[0014] (1) In this utility model, the track-side millimeter wave module and the mobile train millimeter wave module are used to replace the optical fiber with millimeter wave transmission technology, breaking through the traditional RRU-BBU optical fiber direct connection limitation, and realizing high-speed wireless backhaul through millimeter wave, which greatly reduces the construction cost and the transmission is stable. Compared with the existing technology, there is no need to lay optical fiber next to the track, which greatly reduces the construction and maintenance costs. Moreover, it is suitable for complex terrain and scenarios, and can realize the rapid construction of the network.

[0015] (2) This application uses millimeter waves for transmission, providing high bandwidth and low latency communication capabilities;

[0016] In summary, this utility model has the advantages of stable transmission and low cost. Attached Figure Description

[0017] Figure 1 This is a system architecture diagram of this utility model;

[0018] Figure 2 This is a flowchart of data transmission according to this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the track-side millimeter-wave module used in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the mobile train millimeter-wave module used in this utility model. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1

[0027] In this embodiment, a system is proposed to achieve communication in high-speed train movement scenarios through a BBU-RRU distributed architecture and millimeter-wave multi-hop networking. It is particularly suitable for scenarios such as rail trains that require continuous and stable on-board network access. Based on LTE-M and millimeter-wave technology, stable and high-speed communication in high-speed train movement scenarios is achieved through a BBU-RRU distributed architecture, millimeter-wave multi-hop networking, and redundant link design.

[0028] like Figure 1-4As shown in one embodiment of this utility model, the rail transit wireless communication system based on millimeter-wave technology is implemented based on stations, trains, and tracks. It includes a BBU trunking module, a track-side millimeter-wave module, a mobile train millimeter-wave module, a train RRU array module, and an antenna integration module. The BBU trunking module is located at the station and adopts a C-RAN architecture, centrally deploying baseband processing units. Specifically, the ZTE ZXRANB8300M can be used. The BBU trunking module is a modular system that centrally and pools multiple BBUs through a high-speed interconnect network. Its core is to break the traditional mode of independent operation of a single BBU, realizing the utilization of baseband resources through hardware sharing, resource scheduling, and collaborative processing. With centralized management and flexible allocation, the BBU trunking module connects to the RRU array (such as the millimeter-wave antenna array on the train roof) via fiber optic or high-speed cable, converting baseband signals into radio frequency signals for transmission, or receiving radio frequency signals and demodulating them into baseband data. As the core of the Radio Access Network (RAN), the BBU trunking module connects to the core network (such as the AMF and UPF of a 5G core network) via the S1 interface to transmit user data and control signaling. The BBU trunking module is the "brain" of the train communication network, solving signal switching, interference suppression, and bandwidth guarantee issues in high-speed mobile scenarios through baseband resource pooling, collaborative processing, and centralized management. Its collaborative work with the RRU, onboard switch, and core network constitutes the core architecture of train wireless communication. The track-side millimeter-wave module is installed on the track side and connected to the BBU trunking module. The track-side millimeter-wave module includes several specific millimeter-wave devices, such as Jaguar Radio's PTP6150 device. During installation, dedicated mounting poles are set up on the train track side, with a spacing of 200-300m between the poles. These millimeter-wave devices are then installed on these poles. A dynamic relay link is constructed using multi-hop technology, connecting the station-installed BBU trunking module with the moving train millimeter-wave module. The moving train millimeter-wave module is installed on the train and connected to the track-side millimeter-wave module. More specifically, Jaguar Radio's PTP6150 device includes a front shell, bottom shell, mounting bracket, vent valve, grounding terminal, waterproof connector, and other structural components. The mobile train millimeter-wave module can utilize the Jaguar Radio Wave TAU6002 device. The Jaguar Radio Wave TAU6002 device includes an antenna radome, mounting screw holes, grounding terminals, an M12 network port, a reset button, an M12 power port, and a waterproof and breathable valve. It is specifically installed on the train to connect to the trackside millimeter-wave module and the train RRU array module, both mounted on the train track. The train RRU array module is located on the train and connected to the mobile train millimeter-wave module. The train RRU array module receives signals from the trackside millimeter-wave device. An antenna integration module is also located on the train, and the train RRU array module connects to the antenna integration module via the eCCPRI protocol. The antenna integration module includes a multi-network box and an onboard switch.The multi-network box and the vehicle-mounted switch are both installed on the train, with the multi-network box connected to the vehicle-mounted switch. The vehicle-mounted switch is connected to the train's RRU array module. The antenna integration module comprehensively schedules the various train RRUs and backup network resources, and has a built-in intelligent antenna array (such as 8×8 MIMO) that can simultaneously connect to the RF signals of multiple RRUs. For example, a Cisco IE4000 industrial switch can be used. The track-side millimeter-wave module and the mobile train millimeter-wave module both use equipment including, but not limited to, the 60GHz frequency band.

[0029] Specifically, this utility model also includes core network equipment. The BBU cluster module is connected to the core network equipment (such as RPC) via an Ethernet switch. The core network equipment is the "brain center" of the mobile communication network, responsible for processing user data, controlling signaling interaction, and connecting various service platforms. In this utility model, the core network equipment needs to support user handover and high-capacity data transmission when the train is moving at high speed. The core network equipment realizes user connection, data routing, and service policy management through a layered architecture (mobility management, session control, data forwarding). The specific working principle of this utility model is that the core network equipment is connected to the station BBU cluster module via Ethernet, and then through the millimeter-wave equipment next to the track (i.e., trackside millimeter-wave equipment) The system transmits signals through a millimeter-wave module (MW) and a mobile train MW module, then connects to the RRU module inside the train. Finally, through the integrated scheduling of multiple network boxes, it provides high-speed and stable wireless communication signals. The track-side MW module adopts multi-hop relay technology to achieve long-distance signal transmission relay. The mobile train MW module integrates a dual-band front-end and supports polarization diversity and spatial diversity. In this invention, millimeter waves replace optical fibers, breaking through the limitations of traditional RRU-BBU direct optical fiber connection. High-speed wireless backhaul is achieved through 60GHz millimeter waves, significantly reducing construction costs. The track-side MW module and the mobile train MW module adopt a combination of 60GHz link + 28GHz link to ensure stable communication.

[0030] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A rail transit wireless communication system based on millimeter wave technology, based on stations, trains and tracks, characterized in that, include: The BBU cluster module is located at the station and adopts a C-RAN architecture, with baseband processing units centrally deployed. The orbital-side millimeter-wave module is located on the orbital side and connected to the BBU cluster module. A mobile train millimeter-wave module is installed on the train and connected to the trackside millimeter-wave module. The train RRU array module is installed on the train and connected to the mobile train millimeter-wave module. The train RRU array module is used to receive signals from the trackside millimeter-wave equipment. And an antenna integration module, which is installed on the train. The train RRU array module is connected to the antenna integration module via the eCCPRI protocol.

2. The rail transit wireless communication system based on millimeter-wave technology according to claim 1, characterized in that: It also includes core network equipment, and the BBU cluster module is connected to the core network equipment through an Ethernet switch.

3. The rail transit wireless communication system based on millimeter-wave technology according to claim 1, characterized in that: The antenna integration module includes a multi-network box and an on-board switch. Both the multi-network box and the on-board switch are installed on the train, and the multi-network box is connected to the on-board switch. The on-board switch is connected to the train's RRU array module.

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