Urban rail transit LTE distributed base station RRU networking structure

Abstract

The utility model relates to the technical field of urban rail transit vehicle-ground wireless communication, in particular to an urban rail transit LTE (Long Term Evolution) distributed base station RRU (Radio Remote Unit) networking structure, in the networking structure, A-network RRU equipment and B-network RRU equipment are arranged at different addresses, namely, a plurality of A-network RRU equipment and a plurality of B-network RRU equipment are alternately arranged at certain intervals; the A network RRU devices and the B network RRU devices are connected with the leaky coaxial leaky cable through independent radio frequency lines. The utility model has the advantages that the failure rate of the vehicle-ground wireless communication network caused by the failure of the outdoor common radio frequency cable of the A network and the B network can be reduced; discontinuous nodes are allowed to break down, and the signal coverage function of the whole trackside section can still be guaranteed. The availability of a vehicle-ground wireless communication network is improved, and the operation efficiency is effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-to-ground wireless communication technology for urban rail transit, specifically to a network structure for LTE distributed base station RRUs in urban rail transit. Background Technology

[0002] Vehicle-to-ground wireless communication solutions for urban rail transit often employ TD-LTE technology. To improve network availability, a dual-network redundancy design (A and B networks) is typically used. Each network consists of a core network (EPC), network management, baseband processing unit (BBU), remote radio unit (RRU), and onboard wireless terminal (TAU). During LTE network implementation, leaky coaxial cable is commonly used as the transmission medium for vehicle-to-ground wireless communication.

[0003] Traditional LTE-M networks use a co-located setup for outdoor remote radio units (RRUs) of networks A and B, with a single leaky cable feeding back information between networks A and B as an example. Figure 1 As shown.

[0004] Figure 1 The network structure shown depicts outdoor RRU devices for both networks A and B deployed simultaneously at the same location. These RRU devices are repeatedly deployed along the track at 1200m intervals, providing redundancy between networks A and B. LTE information in any segment is covered by signals transmitted from the left and right RRU devices.

[0005] In this network structure, when the RRU equipment at a certain node fails, such as the A network equipment at node ②, the signal of the A network cannot cover the trackside sections ①-② and ②-③. In principle, the vehicle-to-ground wireless network can switch to the B network. However, the radio frequency lines connecting the leaky cables of the A and B network RRU equipment at the same node are shared. When the shared radio frequency lines of the A and B networks experience aging, cracking, or other faults, such as the radio frequency line at node ②, the A and B networks at trackside sections ①-③ will fail simultaneously. The signals of both the A and B networks will be unable to cover the trackside sections ①-③, resulting in a failure of the vehicle-to-ground wireless network in that section and affecting normal operation. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the existing technology by providing a network structure for LTE distributed base station RRUs in urban rail transit. This structure employs a cross-site arrangement of outdoor distributed base station RRU equipment (A and B networks) in the urban rail transit vehicle-to-ground wireless communication network. This avoids the sharing of a single important node in the co-located network method for outdoor RRU equipment (A and B networks), preventing a single node failure from directly causing a vehicle-to-ground wireless communication network failure. This achieves true A and B network redundancy, reduces the failure rate of the vehicle-to-ground wireless communication network caused by faults in the shared outdoor RF cables of the A and B networks, and improves the availability of the vehicle-to-ground wireless communication network.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A network structure for distributed LTE base stations (RRUs) in urban rail transit includes outdoor RRU equipment in networks A and B. The structure is characterized in that the RRU equipment in network A and network B are arranged in a cross-site manner, that is, several RRU equipment in network A and several RRU equipment in network B are arranged alternately at a certain distance interval, and each RRU equipment in network A and each RRU equipment in network B are connected to a leaky coaxial cable through an independent radio frequency line.

[0009] Based on the trackside section, each trackside section is covered by at least one A-network RRU device and one B-network RRU device for signal coverage.

[0010] The A-network RRU devices and the B-network RRU devices are alternately installed at a distance of 600m.

[0011] The advantages of this utility model are: it can reduce the failure rate of the vehicle-to-ground wireless communication network caused by the failure of the shared outdoor radio frequency cable of the A and B networks; it enables the signal coverage of the entire trackside section to be guaranteed even if discontinuous nodes fail; it improves the availability of the vehicle-to-ground wireless communication network and effectively ensures operational efficiency. Attached Figure Description

[0012] Figure 1 This is a diagram of the network structure in existing technologies;

[0013] Figure 2 This is a network structure diagram of the present invention. Detailed Implementation

[0014] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0015] like Figure 1-2 As shown in the figure, the labels represent: Leaky coaxial cable 1, line 2, node ①, node ②, node ③, node ④, node ⑤, node ⑥, node ⑦, and node ⑧.

[0016] Example: Figure 2 As shown in this embodiment, the urban rail transit LTE distributed base station RRU network structure repeatedly sets up outdoor RRU devices of networks A and B at 1200m intervals along line 2. That is, the outdoor RRU devices of network A are spaced 1200m apart, and the outdoor RRU devices of network B are spaced 1200m apart. Furthermore, the RRU devices of network A and network B adopt a cross-site deployment scheme, with a spacing of 600m between them. Both the RRU devices of network A and network B transmit vehicle-to-ground information through leaky coaxial cable 1.

[0017] like Figure 2 As shown, in this embodiment, when the RRU device at a certain node fails, such as the A-network device at node ③, the signal of the trackside section ②-③ is covered by the B-network RRU device at node ②; the signal of the trackside section ③-④ is covered by the B-network RRU device at node ④. This embodiment avoids the situation where an important node is shared in the co-located networking method of A and B network outdoor RRU devices, and realizes true A and B dual network redundancy.

[0018] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A network structure for LTE distributed base station RRUs in urban rail transit, comprising outdoor RRU equipment for networks A and B, characterized in that: In this network structure, the A-network RRU devices and the B-network RRU devices are arranged in a cross-site manner, that is, several A-network RRU devices and several B-network RRU devices are arranged alternately at a certain distance interval, and each A-network RRU device and each B-network RRU device are connected to a leaky coaxial cable through an independent radio frequency line.

2. The urban rail transit LTE distributed base station RRU networking structure according to claim 1, characterized in that: Based on the trackside section, each trackside section is covered by at least one A-network RRU device and one B-network RRU device for signal coverage.

3. The urban rail transit LTE distributed base station RRU networking structure according to claim 1, characterized in that: The A-network RRU devices and the B-network RRU devices are alternately installed at a distance of 600m.

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