A subway wireless relay amplifier with data storage function

Abstract

The present invention is applicable to the field of subway wireless communication, and provides a subway wireless relay amplifier with data storage function, including a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, and a downlink and an uplink connected between the radio frequency switches, as well as an alarm monitoring module and a data storage module, and a power supply module for powering each module component; it adopts TD-LTE baseband synchronization and digital filter technology, and has "two highs and two lows" characteristics, namely high receiving sensitivity / high adjacent channel suppression / low noise coefficient / low radio frequency delay, etc., which can meet the large bandwidth and high performance technical requirements of the new generation of subway communication private network. The unique added data acquisition and local storage module provides configurable, large-capacity automatic recording capabilities for equipment monitoring and interference detection in unattended subway environments.

Description

Technical Field

[0001] The invention relates to the technical field related to subway wireless communication, and in particular to a subway wireless relay amplifier with a data storage function. Background Art

[0002] Currently, the subway communication industry is actively promoting 4G technology to optimize dedicated wireless communication systems to ensure the safety of subway trains. The 350M / 800M TETRA narrowband trunking system currently deployed is being replaced by a 1.8G LTE-M broadband trunking system to support more comprehensive bearer services; the early BTS base station + high-power fiber repeater networking architecture is also being upgraded to a BBU + RRU flexible remote networking architecture, supplemented by low-power wireless repeaters to fill in blind spots and weak links.

[0003] However, the analog wireless repeaters widely used in 2G / 3G networks have technical defects such as high noise coefficient (noise floor raised by 7-8dB) and high isolation requirements (easy to self-excite), which pose a safety hazard to subway private network communications. At the same time, traditional repeaters upload monitoring data through public network channels such as SMS gateways and GPRS / CDMA, but subway private network data is not allowed to be transmitted back through the public network, which seriously limits the way to obtain subway wireless repeater operation data. Summary of the invention

[0004] The present invention provides a subway wireless relay amplifier with data storage function to solve the problems raised in the above background technology.

[0005] The present invention is implemented as follows: a subway wireless relay amplifier with data storage function includes: a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, and a downlink and an uplink connected between the radio frequency switches, as well as an alarm monitoring module and a data storage module, and a power supply module for supplying power to each module component.

[0006] The present invention also provides that the downlink includes a downlink front-end module, a digital baseband processing module and a downlink back-end module which are connected in series in sequence.

[0007] The present invention also provides that the uplink includes an uplink front-end module, a digital baseband processing module and an uplink back-end module which are sequentially connected in series.

[0008] The present invention also provides that the first RF switch is a single-pole double-position high-power RF switch; the first RF switch is connected to the external donor antenna RF port, the downlink front-end processing module IN end, and the uplink back-end processing module OUT end.

[0009] The present invention also provides that the second RF switch is a single-pole double-position RF switch; the second RF switch is connected to the DFOUT port of the digital baseband processing module, the IN end of the downlink backend processing module, and the IN end of the uplink backend processing module.

[0010] The present invention also provides that the third radio frequency switch is a single-pole double-position radio frequency switch; the third radio frequency switch is connected to the DFIN port of the digital baseband processing module, the OUT end of the downlink front-end processing module, and the OUT end of the uplink front-end processing module.

[0011] The present invention also provides that the fourth radio frequency switch is a single-pole double-position high-power radio frequency switch; the fourth radio frequency switch is connected to the retransmission antenna RF port, the downlink back-end processing module OUT end, and the uplink front-end processing module IN end.

[0012] The present invention also provides that the digital baseband processing module includes baseband synchronization, digital filtering, and data sampling, which is shared by the downlink and uplink; the digital baseband module is connected to the OUT end of the third RF switch and the IN end of the second RF switch.

[0013] The present invention also provides that the downlink front-end processing module includes a low noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the downlink front-end processing module is connected to the OUT end of the first radio frequency switch and the IN end of the third radio frequency switch.

[0014] The present invention also provides that the downlink back-end processing module includes a gain amplifier and a power amplifier; the downlink back-end processing module is connected to the second RF switch OUT terminal and the fourth RF switch IN terminal.

[0015] The present invention also provides that the uplink front-end processing module includes a low noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the uplink front-end processing module is connected to the OUT end of the fourth radio frequency switch and the IN end of the third radio frequency switch.

[0016] The present invention also provides that the uplink backend processing module includes a gain amplifier and a power amplifier; the uplink backend processing module is connected to the second RF switch OUT terminal and the first RF switch IN terminal.

[0017] The present invention also provides that the alarm monitoring module includes an MRU, a serial communication port, and an indicator light driver; the alarm monitoring module is connected to a digital baseband processing module and a data storage module; and the alarm monitoring module is connected to an external LMT software via an RS232 interface.

[0018] The present invention also provides that the data storage module comprises a read-write controller and an SDHC data card; the data storage module is connected to the alarm monitoring module.

[0019] The present invention also provides the power supply module to provide a stable +5V / +3.3V operating voltage for the above module circuits; the power supply module is connected to the above module circuits.

[0020] Compared with the prior art, the beneficial effects of the present invention are: it adopts TD-LTE baseband synchronization and digital filter technology, has "two highs and two lows" characteristics, namely high receiving sensitivity / high adjacent channel suppression / low noise coefficient / low RF delay, etc., which can meet the large bandwidth and high performance technical requirements of the new generation of subway communication private network.

[0021] The unique added data acquisition and local storage modules provide configurable, large-capacity automatic recording capabilities for equipment monitoring and interference detection in unmanned subway environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle block diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of downlink processing.

[0024] Figure 3 This is a schematic diagram of uplink processing.

[0025] Figure 4 Schematic diagram of data collection and data storage

[0026] In the figure: 1. donor antenna; 2. equipment; 3. retransmission antenna; 20. digital baseband processing module; 21. downlink front-end module; 22. downlink back-end module; 23. uplink back-end module; 24. uplink front-end module; 251. first RF switch; 252. second RF switch; 253. third RF switch; 254. fourth RF switch; 26. power module; 271. alarm monitoring module; 272. data storage module. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] See also Figure 1-Figure 4 The present invention provides a technical solution: including a first RF switch 251, a second RF switch 252, a third RF switch 253, a fourth RF switch 254, a downlink and an uplink connected between the RF switches, an alarm monitoring module 271, a data storage module 242, and a power supply module 26 for supplying power to each module component.

[0029] The downlink includes a downlink front-end module 21, a digital baseband processing module 20 and a downlink back-end module 22 which are connected in series in sequence.

[0030] The uplink includes an uplink front-end module 24, a digital baseband processing module 20 and an uplink back-end module 23 which are connected in series in sequence.

[0031] The first RF switch 251 is a single-pole double-position high-power RF switch; the first RF switch 251 is connected to the external donor antenna RF port, the downlink front-end processing module IN terminal, and the uplink back-end processing module OUT terminal.

[0032] Among them, the second RF switch 252 is a single-pole double-position RF switch; the second RF switch 252 is connected to the DFOUT port of the digital baseband processing module, the IN end of the downlink backend processing module, and the IN end of the uplink backend processing module.

[0033] Among them, the third RF switch 253 is a single-pole double-position RF switch; the third RF switch 253 is connected to the DFIN port of the digital baseband processing module, the OUT end of the downlink front-end processing module, and the OUT end of the uplink front-end processing module.

[0034] The fourth RF switch 254 is a single-pole double-position high-power RF switch; the fourth RF switch 254 is connected to the retransmission antenna RF port, the downlink backend processing module OUT terminal, and the uplink frontend processing module IN terminal.

[0035] The digital baseband processing module 20 includes baseband synchronization, digital filtering, and data sampling, and is shared by the downlink and uplink; the digital baseband module 20 is connected to the OUT terminal of the third RF switch and the IN terminal of the second RF switch.

[0036] Among them, the downlink front-end processing module includes a low-noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the downlink front-end processing module is connected to the OUT end of the first radio frequency switch and the IN end of the third radio frequency switch.

[0037] Among them, the downlink back-end processing module includes a gain amplifier and a power amplifier; the downlink back-end processing module is connected to the second RF switch OUT terminal and the fourth RF switch IN terminal.

[0038] Among them, the uplink front-end processing module includes a low noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the uplink front-end processing module is connected to the OUT end of the fourth radio frequency switch and the IN end of the third radio frequency switch.

[0039] Among them, the uplink back-end processing module includes a gain amplifier and a power amplifier; the uplink back-end processing module is connected to the OUT end of the second RF switch and the IN end of the first RF switch.

[0040] Among them, the alarm monitoring module includes MRU, serial communication port, and indicator light driver; the alarm monitoring module is connected to the digital baseband processing module and the data storage module; the alarm monitoring module is connected to the external LMT software through the RS232 interface.

[0041] The data storage module includes a read-write controller and an SDHC data card; the data storage module is connected to the alarm monitoring module.

[0042] Among them, the power supply module provides a stable +5V / +3.3V operating voltage for the above module circuits; the power supply module is connected to the above module circuits.

[0043] In this embodiment, the system principle of the present invention is as follows: Figure 1 As shown, a wireless signal relay amplifier with a data storage unit disclosed in an embodiment of the present invention mainly includes: a donor antenna 1, a retransmission antenna 3, a digital baseband processing module 20, a downlink front-end module 21, a downlink back-end module 22, an uplink back-end module 23, an uplink front-end module 24, a first RF switch 251, a second RF switch 252, a third RF switch 253, a fourth RF switch 254, a power supply module 26, an alarm monitoring module 271, a data storage module 272, etc.

[0044] The first RF switch 251 is connected to the donor antenna 1. The donor antenna 1 sends the received base station side wireless signal to the first RF switch 251 and separates the downlink signal. The downlink signal is sent to the fourth RF switch 254 after downlink processing. The fourth RF switch 254 is connected to the retransmission antenna 3 and outputs the received downlink signal through the retransmission antenna 3.

[0045] The fourth RF switch 254 is connected to the retransmission antenna 3. The retransmission antenna 3 sends the received terminal side wireless signal to the fourth RF switch 254 and separates the uplink signal. The uplink signal is sent to the first RF switch 251 after uplink processing, and the received uplink signal is output through the donor antenna 1.

[0046] The third RF switch 253 is connected to the DFIN port of the digital baseband processing module 20, and inputs the signal processed by the downlink front-end module 21 or the uplink front-end module 24 to the digital baseband processing module 20 in the downlink and uplink directions, respectively. The digital baseband processing module 20 receives the input signal and completes baseband synchronization and digital filtering.

[0047] The second RF switch 252 is connected to the DFOUT port of the digital baseband processing module 20, and outputs the signal processed by the digital filtering of the digital baseband processing module 20 to the downlink backend module 22 or the uplink backend module 23 for processing in the downlink and uplink directions respectively.

[0048] The SYN port of the digital baseband processing module 20 is connected to the first RF switch 251 , the second RF switch 252 , the third RF switch 253 , and the fourth RF switch 254 respectively, and outputs TDD synchronization timing to control the internal channel switching of the above SPDT RF switches.

[0049] The alarm monitoring module 271 is connected to the COM port of the digital baseband processing module 20, obtains the equipment operation parameters from the digital baseband processing module 20, and determines whether there is an abnormal alarm. The alarm monitoring module 271 outputs the relevant data to the data storage module 272 for storage. The maintenance engineer uses the LMT software to extract historical data or issue monitoring configurations through the maintenance port of the alarm monitoring module 271.

[0050] The data storage module 272 is connected to the alarm monitoring module 271 , receives and stores new data, and also queries and returns historical data according to the instructions of the alarm monitoring module 271 .

[0051] In this embodiment, the downlink processing, such as Figure 2 As shown, the downlink includes a downlink front-end processing module 21, a digital baseband processing module 20 and a downlink back-end processing module 22 which are connected in series in sequence, and the downlink front-end processing module 21 is connected to the first RF switch 251 and the third RF switch 253, and the downlink back-end processing module 22 is connected to the second RF switch 252 and the fourth RF switch 254.

[0052] When the donor antenna 1 sends the received wireless signal to the first RF switch 251 , the first RF switch 251 performs signal separation, and separates the downlink signal into the downlink front-end processing module 21 .

[0053] The downlink signal enters the downlink front-end processing module 21 , passes through a low noise amplifier, a surface acoustic wave filter, and a gain amplifier in sequence, enters the third RF switch 253 , and then enters the digital baseband processing module 20 .

[0054] The digital baseband processing module 20 extracts the TDD time slot characteristics from the downlink signal and outputs a continuous and stable synchronization control signal for controlling the switching timing of the four RF switches.

[0055] The digital baseband processing module 20 simultaneously completes the frequency selection and filtering processing of the downlink signal, and then outputs it to the second RF switch 252 and then enters the downlink backend processing module 22.

[0056] The downlink signal enters the downlink backend processing module 22 , is amplified by gain and PA in sequence, and then enters the fourth RF switch 254 , and is finally output through the retransmission antenna 3 .

[0057] In this embodiment, the uplink processing, such as Figure 3 As shown, the uplink includes an uplink front-end module 24, a digital baseband processing module 20 and an uplink back-end module 23 connected in series in sequence, and the uplink front-end module 24 is connected to the fourth RF switch 254 and the third RF switch 253, and the uplink back-end module 23 is connected to the second RF switch 252 and the first RF switch 251;

[0058] After the retransmission antenna 3 sends the received wireless signal to the fourth RF switch 254 , the fourth RF switch 254 performs signal separation, and separates the uplink signal into the uplink front-end processing module 24 .

[0059] The uplink signal enters the uplink front-end processing module 24 , passes through a low noise amplifier, a surface acoustic wave filter, and a gain amplifier in sequence, enters the third RF switch 253 , and then enters the digital baseband processing module 20 .

[0060] The digital baseband processing module 20 completes the frequency selection and filtering processing of the uplink signal, and then outputs it to the second RF switch 252 and then enters the uplink backend processing module 23 .

[0061] The uplink signal enters the uplink backend processing module 23, and enters the first RF switch 251 after undergoing gain amplification and PA amplification in sequence, and is finally output through the donor antenna 1.

[0062] In this embodiment, data collection and data storage, such as Figure 4 As shown, the data acquisition and data storage related components include a baseband digital processing module 20, an alarm monitoring module 271 and a data storage module 272 which are connected in sequence, and the alarm monitoring module 271 communicates with the external LMT software via an RS232 interface.

[0063] Multiple sensors inside the device detect respectively: the uplink / downlink power of the donor antenna 1, the uplink / downlink power of the retransmission antenna 3, the downlink standing wave ratio of the retransmission antenna 3, the power amplifier temperature of the downlink back-end processing module 22, the power amplifier temperature of the uplink back-end processing module 23, the output voltage value of the power module 26 and the baseband synchronization status, etc. All detection signals are collected in the digital baseband processing module 20, and data sampling is performed according to the preset sampling format and sampling period, and the sampled data is uniformly transmitted to the alarm monitoring module 271.

[0064] The alarm monitoring module 271 receives the sampled data and compares it with the preset alarm threshold. If the current value exceeds the threshold, an alarm is triggered and the alarm indicators on various chassis panels are driven to light up, such as high temperature of the power amplifier, synchronization failure, high standing wave ratio, power failure, etc. At the same time, the alarm monitoring module 271 transmits the status data and alarm data to the data storage module 272 according to the preset recording format and recording period.

[0065] The data storage module 272 receives the updated data and writes it into the local SDHC card. The data storage module 272 can regularly clear outdated data according to the preset maximum storage period;

[0066] The external LMT software is connected to the alarm monitoring module 271 via the RS232 interface, and can modify the configuration strategy of data collection and data storage, which is forwarded by the alarm monitoring module 271 to the digital baseband processing module 20 and the data storage module 272. The LMT software can also forward query instructions to the data storage module 272 through the alarm monitoring module 271 to read historical data.

[0067] The subway wireless relay amplifier described in this embodiment adopts TD-LTE baseband synchronization and digital filter technology, and has "two highs and two lows" characteristics, namely high receiving sensitivity / high adjacent channel suppression / low noise coefficient / low RF delay, etc., which can meet the large bandwidth and high performance technical requirements of the new generation of subway communication private network.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A subway wireless relay amplifier with data storage function, characterized in that: include: A first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a downlink and an uplink connected between the radio frequency switches, an alarm monitoring module and a data storage module, and a power supply module for supplying power to components of each module; The downlink includes a downlink front-end module, a digital baseband processing module and a downlink back-end module connected in series in sequence; The uplink includes an uplink front-end module, a digital baseband processing module and an uplink back-end module which are connected in series in sequence; The first RF switch is a single-pole double-position high-power RF switch; the first RF switch is connected to the external donor antenna RF port, the downlink front-end processing module IN terminal, and the uplink back-end processing module OUT terminal; The second RF switch is a single-pole double-position RF switch; the second RF switch is connected to the DFOUT port of the digital baseband processing module, the IN end of the downlink backend processing module, and the IN end of the uplink backend processing module; The third RF switch is a single-pole double-position RF switch; the third RF switch is connected to the DFIN port of the digital baseband processing module, the OUT end of the downlink front-end processing module, and the OUT end of the uplink front-end processing module; The fourth radio frequency switch is a single-pole double-position high-power radio frequency switch; the fourth radio frequency switch is connected to the retransmission antenna RF port, the downlink back-end processing module OUT terminal, and the uplink front-end processing module IN terminal; The digital baseband processing module includes baseband synchronization, digital filtering, and data sampling, and is shared by the downlink and uplink; the digital baseband processing module is connected to the OUT terminal of the third RF switch and the IN terminal of the second RF switch; The subway wireless relay amplifier adopts TD-LTE baseband synchronization and digital filter technology; The digital baseband processing module extracts TDD time slot characteristics from the downlink signal and outputs a continuous and stable synchronization control signal to control the switching timing of the four RF switches; Multiple sensors inside the device detect: uplink / downlink power of the donor antenna, uplink / downlink power of the retransmission antenna, downlink standing wave ratio of the retransmission antenna, power amplifier temperature of the downlink backend processing module, power amplifier temperature of the uplink backend processing module, output voltage value of the power module and baseband synchronization status. All detection signals are collected in the digital baseband processing module, and data sampling is performed according to the preset sampling format and sampling period. The sampled data is uniformly transmitted to the alarm monitoring module; The alarm monitoring module receives the sampled data and compares it with the preset alarm threshold. If the current value exceeds the threshold, an alarm is triggered and the alarm indicators on various chassis panels are driven to light up. At the same time, the alarm monitoring module transmits the status data and alarm data to the data storage module according to the preset recording format and recording cycle; The data storage module accepts updated data and writes it into the local SDHC card. The data storage module can regularly clear expired data according to the preset maximum storage period; The external LMT software is connected to the alarm monitoring module via the RS232 interface, and can modify the configuration strategies of data collection and data storage. The alarm monitoring module forwards the alarms to the digital baseband processing module and the data storage module respectively. The LMT software can also forward query instructions to the data storage module through the alarm monitoring module to read historical data.

2. The subway wireless relay amplifier with data storage function according to claim 1, characterized in that: The downlink front-end processing module includes a low noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the downlink front-end processing module is connected to the OUT end of the first radio frequency switch and the IN end of the third radio frequency switch.

3. The subway wireless relay amplifier with data storage function according to claim 2, characterized in that: The downlink back-end processing module includes a gain amplifier and a power amplifier; the downlink back-end processing module is connected to the OUT end of the second RF switch and the IN end of the fourth RF switch.

4. The subway wireless relay amplifier with data storage function according to claim 3 is characterized in that: The uplink front-end processing module includes a low noise amplifier, a radio frequency surface acoustic wave filter, and a gain amplifier; the uplink front-end processing module is connected to the OUT end of the fourth radio frequency switch and the IN end of the third radio frequency switch.

5. The subway wireless relay amplifier with data storage function according to claim 4, characterized in that: The uplink backend processing module includes a gain amplifier and a power amplifier; the uplink backend processing module is connected to the OUT end of the second RF switch and the IN end of the first RF switch.

6. The subway wireless relay amplifier with data storage function according to claim 1, characterized in that: The data storage module includes a read-write controller and an SDHC data card; the data storage module is connected to the alarm monitoring module.

7. The subway wireless relay amplifier with data storage function according to claim 1, characterized in that: The power supply module provides a stable +5V / +3.3V operating voltage for the above module circuits; the power supply module is connected to the above module circuits.

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