In-transit monitoring device for radio frequency signals of base station

Abstract

The invention relates to the technical field of leaky coaxial cable monitoring, in particular to a base station radio frequency signal in-transit monitoring device which comprises an information source monitoring host, a coupler, a bridge and a signal source, the information source monitoring host is connected with a plurality of information source inputs, the information source inputs are connected to the bridge through the coupler, and the signal source is connected to the bridge through the coupler. One bridge is connected with the two couplers, the other bridge is respectively connected with the two signal sources used for in-transit monitoring, the couplers used for receiving and transmitting signals are connected with a monitored leaky cable, the signal source monitoring host is connected with the switch through an optical fiber, and the switch transmits monitoring information to the server through a transmission network. The server is connected with a network terminal used for real-time supervision. The information source monitoring host is arranged and installed in the advancing direction of the leaky coaxial cable, four input information sources can be analyzed at the same time, analyzed results are uploaded and monitored in time, fixed-point monitoring can be conducted on the leaky coaxial cable, and plugging loss and interference are low.

Description

Technical Field

[0001] The invention relates to the technical field of leaky cable monitoring, in particular to an on-the-way monitoring device for base station radio frequency signals. Background Art

[0002] The urban rail transit signal system used in the subway relies on wireless signals to achieve vehicle-to-ground communication, which is achieved by base stations transmitting signals and leaky cables carrying wireless signal transmission.

[0003] In the prior art, the name disclosed in the application number: 2022233394447 is: a leaky cable monitoring system, which includes a leaky cable unit, a combining unit, a service signal unit, a monitoring unit, a field management unit, a transmission unit, a server unit and a network management unit, a signal transceiver module, the signal transceiver module is connected to the combining unit, and is used to transmit a test signal to the combining unit to test the leaky cable unit, and receive a reflected signal of the leaky cable unit from the combining unit; a calculation module, the calculation module is connected to the signal transceiver module, and is used to measure and calculate the parameters of the reflected signal.

[0004] However, in the prior art, such as the leakage cable monitoring system mentioned in Application No. 2022233394447, the on-the-way monitoring equipment needs to be charged during the rail transit route, and the signal needs to pass through non-conductive devices such as power dividers. When a problem occurs, it can only be determined that there is a problem with the entire link channel, and the type of fault cannot be analyzed. Summary of the invention

[0005] The object of the present invention is to provide an in-transit monitoring device for base station radio frequency signals to solve the problems in the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A device for monitoring radio frequency signals of a base station in transit, comprising a signal source monitoring host, a coupler, a bridge and a signal source.

[0008] The signal source monitoring host is connected to several signal source inputs, which are connected to the bridge through couplers. One bridge is connected to two couplers, and one bridge is respectively connected to two signal sources for in-transit monitoring. The coupler for sending and receiving signals is connected to the monitored leaky cable.

[0009] The information source monitoring host is connected to the switch via an optical fiber, and the switch transmits the monitoring information to the server via a transmission network, and a network terminal for real-time monitoring is connected to the server.

[0010] Preferably, a plurality of radio frequency electronic switches are provided in the signal source monitoring host, wherein one side of the radio frequency electronic switch for inputting signals is connected to the signal source input, and the other side is connected to the LTE wireless terminal module for feedback signals through another radio frequency electronic switch for collecting signals, and a USB interface for connecting the LTE wireless terminal module is provided on the main control CPU.

[0011] Preferably, the RF electronic switch is connected to another RF electronic switch via RF, and one RF is connected to two RF electronic switches on one side and connected via an LTE wireless terminal module on the other side.

[0012] Preferably, the LTE wireless terminal module is electrically connected to three radio frequency electronic switches, and the three radio frequency electronic switches are controlled by outputting feedback signals from the LTE wireless terminal module.

[0013] Preferably, a photoelectric conversion module is provided in the source monitoring host, and the photoelectric conversion module for receiving the main control CPU signal is electrically connected to the main control CPU and connected to the switch via an optical fiber.

[0014] Preferably, the RF electronic switch 1, RF electronic switch 2 and RF electronic switch 3 are all single-pole double-throw switches.

[0015] Preferably, the information source monitoring host further includes a temperature sensor, a memory card, a watchdog reset, a USB maintenance interface and a serial port, and the above components are all electrically connected to the main control CPU.

[0016] Preferably, the signal source comprises a plurality of radio frequency units and bridges, and two bridges are cross-connected to two radio frequency units.

[0017] Beneficial effects of the present invention:

[0018] 1. The in-transit monitoring device of the present invention can analyze four input signal sources at the same time, and upload the analysis results to the monitoring in time, which is convenient for timely management. At the same time, the connection setting of three radio frequency electronic switches is used to ensure that there is always a signal source input, and fixed-point monitoring can be performed on the leaky cable;

[0019] 2. The in-transit monitoring device of the present invention is arranged and installed with a signal source monitoring host in the direction of travel of the leaky cable, which saves manpower and material resources while performing comprehensive monitoring of the leaky cable. Through optical fiber transmission, the signal is stable and reliable, reducing plug-in loss and interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal system of the information source monitoring host of the present invention;

[0023] Figure 3 It is a schematic diagram of the monitoring structure of the information source monitoring host of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A device for monitoring radio frequency signals of a base station in transit, such as Figure 1 As shown, the in-transit monitoring device includes a signal source monitoring host, which is connected to at least four signal source interfaces. The four signal source interfaces are used to connect to signal source one, signal source two, signal source three and signal source four for signal source input. The signal source monitoring host is connected to the switch via an optical fiber, and the data is input into the switch. The switch transmits the data to the server via the transmission network. Finally, the server is electrically connected to the network management terminal, and real-time monitoring and management are performed through the network management terminal.

[0026] like Figure 2 As shown, the signal source monitoring host includes an LTE wireless terminal module, a main control CPU, an optoelectronic conversion module and several RF electronic switches. The signal source monitoring can complete the monitoring of 4 signal sources. RF electronic switch 1 is electrically connected to signal source 1, signal source 2 and RF 1, RF electronic switch 2 is electrically connected to signal source 3, signal source 4 and RF 2, RF 1 and RF 2 are electrically connected to RF 3 through RF electronic switch 3, and RF 3 is connected to the LTE wireless terminal module.

[0027] The RF electronic switch 1, RF electronic switch 2 and RF electronic switch 3 in this embodiment are all single-pole double-throw.

[0028] The various component modules of the signal source monitoring host are integrated in a chassis, which can analyze 4 input signal sources at the same time, transmit the analysis results to the switch through optical fiber, and then upload them to the server through the transmission network, and perform real-time monitoring and management at the network management terminal, and timely report and monitor.

[0029] The LTE wireless terminal module is electrically connected to the main control CPU via a USB interface provided on the main control CPU, and the LTE wireless terminal module is electrically connected to three RF electronic switches, and is used to feed back control switching signals to the three RF electronic switches to control the operation of the three RF switches. The LTE wireless terminal module analyzes the signal of the signal source, and sends data such as field strength, signal quality, and cell information to the main control CPU via USB. The main control CPU judges and organizes the data, processes it using the optoelectronic conversion module, and sends it out via optical fiber to the switch.

[0030] In addition, the signal source monitoring host is also equipped with a temperature sensor, a memory card, a watchdog reset, a USB maintenance interface and a serial port. The above components are all electrically connected to the main control CPU. Under the control of the main control CPU, the temperature sensor monitors the working environment temperature; the memory card stores the signal source data; the watchdog reset function; the USB maintenance interface is used to connect external devices during equipment maintenance.

[0031] like Figure 3 As shown, in the subway rail transit communication system, two LTE base station radio frequency units RRU and four leaky cables are equipped, namely leaky cable 1, leaky cable 2, leaky cable 3 and leaky cable 4. The two radio frequency units RRU are A network RRU and B network RRU, and the two radio frequency units RRU are cross-connected with bridge 1 and bridge 2 respectively.

[0032] Each bridge is connected to two couplers, and the coupler is connected to a leaky cable. Four couplers match four leaky cables. A single coupler is electrically connected to any source input. Each leaky cable will have signals of two RRUs, and each source input will contain signals of two RRUs.

[0033] The output power of the RRU is 43dBm, the insertion loss of the bridge is 3.5dB, the coupler is 70dB, and after adding the cable loss of about 0.5dB, the RRU signal entering the source monitoring host is about 43-3.5-70-0.5=-31dBm.

[0034] Since all feeder lines are directly connected, as long as the construction is normal, the input power monitored by the source monitoring equipment will be constant.

[0035] Since the sensitivity of the LTE wireless terminal module is relatively good, about -107dBm, assuming that the signal of source input one fails, the signal of source input two will also leak into source input one through bridge one. The isolation of the bridge is generally 25dB. At this time, the maximum leakage signal of source input two received through source input one is -31-25=58dBm, which can be judged as an abnormal monitoring signal.

[0036] Similarly, the four input links also have leakage problems inside the signal source monitoring host, but the isolation of the RF electronic switch is relatively high (≥60dB), so the power leaked from other links to the monitored link is ≤-90dBm, which can also be judged as an abnormal monitoring signal.

[0037] The signal source monitoring host monitors and analyzes the four input sources respectively through the time-sharing control method, so the power of each input link should be a constant signal of about -31dBm. If the monitored power value is not within the allowable error range (usually the allowable error in engineering is ±3dB), it can be judged that this link is faulty.

[0038] Source monitoring can use the four links, signal analysis of A and B networks as known conditions, and determine the status of each node in each link through permutations and combinations. The status of passive components such as RF lines, bridges, and couplers is combined into the link status to monitor the following situations:

[0039] If all four source links report a network A failure, it is determined that the network A is faulty;

[0040] If all four source links report a B network failure, it is considered to be a B network failure;

[0041] If all four source links report that network A and network B are faulty, it is determined that both network A and network B are faulty;

[0042] In addition to the above three states, as long as one link reports A or B network failure, it is judged as a link failure and on-site personnel will investigate the specific fault point.

[0043] It can avoid the problems of multiple combinations and complex software design, effectively reduce software complexity, and is practical at the same time.

[0044] In this embodiment, the monitoring device has a monitoring function and can monitor the RRU signal of the LTE base station, including:

[0045] The real-time output power of RRU can be monitored and recorded locally. Historical data can be queried on the network management system, and curves can be drawn. Risks can be predicted based on trends, and the output power of RRU signals can be effectively monitored.

[0046] By analyzing the cell information of RRU, the real-time signal quality of RRU can be monitored and recorded locally. Historical data can be queried on the network management, and curves can be drawn. Risks can be predicted based on trends, and the signal quality SINR and RSRQ of RRU can be effectively monitored.

[0047] Link failures can be determined through cross-monitoring and permutation and combination, and warnings can be issued through historical data analysis to effectively monitor RRU signals and RF device fault location and alarms. RF devices include but are not limited to duplexers, bridges, combiners, and antenna feeder interfaces.

[0048] The monitoring device also has the function of reporting monitoring and alarms to the monitoring server; reading, storing and exporting data from the local maintenance interface.

[0049] The shell of the monitoring device is made of AL6063 material, which has good heat dissipation performance and is easy to install.

[0050] This embodiment uses radio frequency electronic switches to achieve real-time monitoring of four signal source links, and locates faults of nodes such as RRU, feeder, and passive devices through permutations and combinations, and issues early warnings of risks through historical data analysis, thereby reducing the operating and maintenance costs of the wireless system, generating warnings in advance, and reducing driving risks.

[0051] It has the following advantages: using radio frequency electronic switches to monitor four signal source links to meet actual application scenarios; determining the fault location and type of the signal source by analyzing the RRU signal sources of networks A and B and the arrangement and combination of the four links; issuing early warnings for possible risks through historical data analysis and trends; real-time monitoring of data; and a complete integrated structure.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A base station radio frequency signal in transit monitoring device, characterized in that: The on-the-way monitoring device comprises a signal source monitoring host, a coupler, a bridge and a signal source; The signal source monitoring host is connected to a plurality of signal source inputs, which are connected to a bridge through a coupler, one bridge is connected to two couplers, and one bridge is respectively connected to two signal sources for in-transit monitoring, and a coupler for sending and receiving signals is connected to the leaky cable to be monitored; The information source monitoring host is connected to the switch via an optical fiber, and the switch transmits the monitoring information to the server via a transmission network, and a network terminal for real-time monitoring is connected to the server.

2. The device for monitoring radio frequency signals of a base station in transit according to claim 1, characterized in that: The signal source monitoring host is provided with several radio frequency electronic switches, wherein one side of the radio frequency electronic switch for inputting signals is connected to the signal source input, and the other side is connected to the LTE wireless terminal module for feedback signals through another radio frequency electronic switch for collecting signals, and the main control CPU is provided with a USB interface for connecting the LTE wireless terminal module.

3. The device for monitoring the radio frequency signal of a base station in transit according to claim 2, characterized in that: The radio frequency electronic switch is connected to another radio frequency electronic switch via RF, and one side of one RF is connected to two radio frequency electronic switches, and the other side is connected via an LTE wireless terminal module.

4. The device for monitoring the radio frequency signal of a base station in transit according to claim 3, characterized in that: The LTE wireless terminal module is electrically connected to the three radio frequency electronic switches, and the three radio frequency electronic switches are controlled by the feedback signal output by the LTE wireless terminal module.

5. The device for monitoring radio frequency signals of a base station in transit according to claim 2, characterized in that: The source monitoring host is provided with a photoelectric conversion module, and the photoelectric conversion module for receiving the main control CPU signal is electrically connected to the main control CPU and connected to the switch through an optical fiber.

6. The device for monitoring radio frequency signals of a base station in transit according to claim 4, characterized in that: The radio frequency electronic switch 1, the radio frequency electronic switch 2 and the radio frequency electronic switch 3 are all single-pole double-throw switches.

7. The device for monitoring the radio frequency signal of a base station in transit according to claim 2, characterized in that: The information source monitoring host also includes a temperature sensor, a memory card, a watchdog reset, a USB maintenance interface and a serial port, and the above components are all electrically connected to the main control CPU.

8. The device for monitoring radio frequency signals of a base station in transit according to claim 1, characterized in that: The signal source includes a plurality of radio frequency units and bridges, and two bridges are cross-connected to two radio frequency units.

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