CN212752646U - 5G small base station synchronous time service device - Google Patents
5G small base station synchronous time service device Download PDFInfo
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- CN212752646U CN212752646U CN202022148810.5U CN202022148810U CN212752646U CN 212752646 U CN212752646 U CN 212752646U CN 202022148810 U CN202022148810 U CN 202022148810U CN 212752646 U CN212752646 U CN 212752646U
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Abstract
The utility model provides a 5G small base station synchronous time service device, which comprises a GNSS receiver, a TD-LTE baseband synchronous module, a selector and a plurality of RJ45 interfaces, wherein a first output end of the GNSS receiver is connected with a first input end of the selector; the output end of the TD-LTE baseband synchronization module is connected with the second input end of the selector; the selector is provided with a plurality of output ends which are respectively connected with a plurality of RJ45 interfaces; a plurality of RJ45 interfaces can be connected with a plurality of 5G small base stations in a one-to-one correspondence manner; the utility model discloses concentrate and set up the synchronous time service device of 5G little basic station, through the synchronous time service device of RJ45 interface connection 5G little basic station and a plurality of 5G little basic station, concentrate the processing of accomplishing satellite signal and the acquisition of synchronizing signal by the synchronous time service device of 5G little basic station, need not to all set up the GNSS receiver in every 5G little basic station, practiced thrift a large amount of costs.
Description
Technical Field
The utility model relates to a 5G communication field especially relates to a synchronous time service device of 5G little basic station.
Background
With the rapid development of 5G networks, 5G small base stations are increasingly demanded; the TDD mode of the 5G small base station requires synchronization between the base station and the terminal, and synchronization between the base station and the terminal is also required; in a TDD system, if the time of base stations is asynchronous, uplink and downlink cross time slot interference can be caused, and the performance of a network is seriously influenced, so that 5G small base stations are required to be synchronous; in order to realize synchronization among different base stations, a reference synchronization signal is provided, and the 5G small base station performs clock adjustment according to the reference synchronization signal so as to achieve synchronization among the base stations.
The method for synchronizing by receiving the 1pps pulse signals of the GNSS satellite is one of the commonly used synchronization methods of the 5G small base stations at present, because the number of the 5G small base stations is a multiple relation of the number of the 4G small base stations, the required number of the 5G small base stations is very large, the GNSS module with the time service function is relatively expensive, and if each 5G small base station is matched with one GNSS satellite receiver, more cost needs to be added. Meanwhile, a feeder line of the GNSS receiver adopts a coaxial cable, the 5G small base station is basically installed indoors, the coaxial cable needs to be longer, the coaxial cable is higher in wiring requirement than a common wire, and the construction cost during equipment installation is greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: provided is a 5G small base station synchronization time service device, which saves the cost for synchronizing the 5G small base station.
In order to solve the technical problem, the utility model discloses a technical scheme be:
A5G small base station synchronous time service device comprises a GNSS receiver, a TD-LTE baseband synchronous module, a selector and a plurality of RJ45 interfaces, wherein a first output end of the GNSS receiver is connected with a first input end of the selector;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the selector;
the selector is provided with a plurality of output ends which are respectively connected with a plurality of RJ45 interfaces;
and a plurality of 5G small base stations can be connected to a plurality of RJ45 interfaces in a one-to-one correspondence manner.
Further, the frequency divider comprises a synchronous frequency divider;
the first output end of the GNSS receiver is also connected with the first input end of the synchronous frequency divider;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the synchronization frequency divider;
the output end of the synchronous frequency divider is connected with the second input end of the selector.
Furthermore, the device also comprises a GNSS antenna, and the GNSS antenna is connected with the input end of the GNSS receiver.
Further, the system also comprises a singlechip and an alarm platform;
the input end of the singlechip is connected with the second output end of the GNSS receiver;
the bidirectional communication end of the single chip microcomputer is connected with the first bidirectional communication end of the TD-LTE baseband synchronization module;
in the single chip microcomputer, the input end of the single chip microcomputer is connected with a first UART, and the bidirectional communication end of the single chip microcomputer is connected with a second UART;
and a second bidirectional communication end of the TD-LTE baseband synchronization module is connected with the alarm platform.
Further, the device also comprises a plurality of 485 chips;
the input ends of the 485 chips are respectively connected with the output ends of the selector;
the output ends of the 485 chips are respectively connected with the RJ45 interfaces;
the RJ45 interface is connected to a direct-connected twisted pair network cable.
Furthermore, the model of the TD-LTD baseband synchronization module is HR-TD-03A.
The beneficial effects of the utility model reside in that: concentrate and set up 5G little basic station synchronous time service device, through RJ45 interface connection 5G little basic station synchronous time service device and a plurality of 5G little basic stations, accomplish the processing of satellite signal and the acquisition of synchronizing signal by 5G little basic station synchronous time service device is concentrated, need not all to set up the GNSS receiver in every 5G little basic station, a large amount of costs have been practiced thrift, and each 5G little basic station directly receives synchronizing signal and accomplishes self-synchronization, need not directly to resolve the satellite signal, synchronous error between the 5G little basic station has been reduced, synchronous accuracy has been improved.
Drawings
Fig. 1 is a 5G small base station synchronization time service device according to an embodiment of the present invention.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a 5G small base station synchronization time service device includes a GNSS receiver, a TD-LTE baseband synchronization module, a selector, and a plurality of RJ45 interfaces, where a first output end of the GNSS receiver is connected to a first input end of the selector;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the selector;
the selector is provided with a plurality of output ends which are respectively connected with a plurality of RJ45 interfaces;
and a plurality of 5G small base stations can be connected to a plurality of RJ45 interfaces in a one-to-one correspondence manner.
From the above description, the beneficial effects of the present invention are: concentrate and set up 5G little basic station synchronous time service device, through RJ45 interface connection 5G little basic station synchronous time service device and a plurality of 5G little basic stations, accomplish the processing of satellite signal and the acquisition of synchronizing signal by 5G little basic station synchronous time service device is concentrated, need not all to set up the GNSS receiver in every 5G little basic station, a large amount of costs have been practiced thrift, and each 5G little basic station directly receives synchronizing signal and accomplishes self-synchronization, need not directly to resolve the satellite signal, synchronous error between the 5G little basic station has been reduced, synchronous accuracy has been improved.
Further, the frequency divider comprises a synchronous frequency divider;
the first output end of the GNSS receiver is also connected with the first input end of the synchronous frequency divider;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the synchronization frequency divider;
the output end of the synchronous frequency divider is connected with the second input end of the selector.
According to the description, the synchronous frequency divider is arranged, so that the satellite signal of the GNSS receiver and the network signal of the TD-LTE baseband synchronous module can be acquired, the frequency division can be performed on the network signal according to the satellite signal, when the satellite signal fails, synchronous time service can be performed through the network signal after the frequency division, and the stability of the whole system is enhanced.
Furthermore, the device also comprises a GNSS antenna, and the GNSS antenna is connected with the input end of the GNSS receiver.
According to the description, the GNSS antenna is used for receiving the satellite signals and transmitting the satellite signals to the GNSS receiver, and the antenna is additionally arranged, so that the influence of various interferences on signal receiving can be reduced, the satellite signals which are more clear and stable are obtained, and the synchronization accuracy is further ensured.
Further, the system also comprises a singlechip and an alarm platform;
the input end of the singlechip is connected with the second output end of the GNSS receiver;
the bidirectional communication end of the single chip microcomputer is connected with the first bidirectional communication end of the TD-LTE baseband synchronization module;
in the single chip microcomputer, the input end of the single chip microcomputer is connected with a first UART, and the bidirectional communication end of the single chip microcomputer is connected with a second UART;
and a second bidirectional communication end of the TD-LTE baseband synchronization module is connected with the alarm platform.
According to the above description, the fault analysis can be performed on the received satellite signal by setting the single chip microcomputer, and if the fault occurs, the warning signal can be sent through the TD-LTE module through the network, so that the manager can acquire the fault information in time.
Further, the device also comprises a plurality of 485 chips;
the input ends of the 485 chips are respectively connected with the output ends of the selector;
the output ends of the 485 chips are respectively connected with the RJ45 interfaces;
the RJ45 interface is connected to a direct-connected twisted pair network cable.
As can be seen from the above description, the synchronous signals are processed and converted into 485 differential levels by the plurality of 458 chips, and the processed signals are transmitted to the 5G small cell base station through the RJ45 interface, so as to implement synchronous time service for the 5G small cell base station.
Furthermore, the model of the TD-LTD baseband synchronization module is HR-TD-03A.
From the above description, the HR-TD-03A can automatically complete cell search and wireless signaling processing of the TD-LTE/TD-SCDMA wireless network, obtain accurate information such as TDD uplink and downlink timeslot timing, uplink and downlink timeslot ratio, and output a 10ms frame synchronization signal through a General-purpose input/output (GPIO) interface of the HR-TD-03A module.
Referring to fig. 1, a first embodiment of the present invention is:
A5G small base station synchronous time service device comprises a GNSS (Global Navigation Satellite System) antenna, a GNSS receiver, a TD-LTE baseband synchronization module, a synchronization frequency divider, a selector, a single chip microcomputer, an alarm platform, a plurality of 485 chips and a plurality of RJ45 interfaces, wherein the GNSS antenna is connected with the input end of the GNSS receiver;
a first output end of the GNSS receiver is connected with a first input end of the selector; the first output end of the GNSS receiver is also connected with the first input end of the synchronous frequency divider;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the synchronization frequency divider;
the output end of the synchronous frequency divider is connected with the second input end of the selector;
the selector is provided with a plurality of output ends, and the output ends are respectively connected with the input ends of the 485 chips;
the output ends of the 485 chips are respectively connected with the RJ45 interfaces; specifically, a 485A signal of the 485 chip is connected to a 1 pin of the RJ45, a 485B signal is connected to a 2 pin of the RJ45 interface, and a 3 pin and a 6 pin of the RJ45 interface are grounded, so that the same reference ground plane is provided for transmitting and receiving the 485 level after the 485 level is transmitted to the 5G small base station;
a plurality of RJ45 interfaces can be connected with a plurality of 5G small base stations in a one-to-one correspondence mode through direct-connected twisted pair cables;
the input end of the singlechip is connected with the second output end of the GNSS receiver;
the bidirectional communication end of the single chip microcomputer is connected with the first bidirectional communication end of the TD-LTE baseband synchronization module;
in the single chip microcomputer, the input end of the single chip microcomputer is connected with a first UART, and the bidirectional communication end of the single chip microcomputer is connected with a second UART;
a second bidirectional communication end of the TD-LTE baseband synchronization module is connected with the alarm platform;
in an optional implementation mode, the model of the TD-LTD baseband synchronization module is HR-TD-03A;
in an alternative embodiment, the GNSS comprises a GPS or beidou satellite navigation system;
in an optional implementation, the synchronous frequency divider and the selector are both CPLDs (Complex programmable logic devices), and the CPLDs have a plurality of programmable IOs and can be connected with a plurality of 485 chips according to actual needs;
the specific working mode is as follows: after receiving satellite signals, the GNSS antenna transmits the satellite signals to the GNSS receiver, the GNSS receiver can stably output 1pps of pulse signals as synchronous pulse signals to the selector and the synchronous frequency divider according to the satellite signals, meanwhile, the TD-LTE baseband synchronization module acquires network signals, and outputs 10ms frame synchronous signals to the synchronous frequency divider according to the network signals; the synchronous frequency divider aligns the 10ms frame synchronous signal with the 1pps signal, and frequency-divides the 10ms frame synchronous signal by taking the 1pps signal as a reference signal to generate a corresponding relation between the 10ms frame synchronous signal and the 1pps signal and store the corresponding relation in the selector; when the selector receives a 1pps signal sent by the GNSS receiver, the selector directly outputs the 1pps signal to the plurality of 485 chips; if the CPU (single chip microcomputer) detects that the GNSS signal is lost, the selector is informed through an IO alarm signal, the selector is switched to acquire a 10ms frame synchronization signal through a TD-LTE baseband synchronization module, the 10ms frame synchronization signal is converted into a 1HZ synchronization signal according to the stored corresponding relation, the 1HZ synchronization signal is used for outputting, the switching action can be completed within 1s, and the 1s is the cycle time for sending the synchronization signal, so that the accuracy and the continuity of time service can be ensured; after the GNSS signal is recovered to be normal, the selector is switched to the 1pps signal again for outputting; the 485 chip receives the output signal of the selector, converts the output signal into 485 differential level, and outputs the 485 differential level to the 5G small base stations corresponding to the 485 differential level one by one through the RJ45 interface;
after receiving satellite signals, the GNSS Receiver also sends the satellite signals to the single chip microcomputer, the single chip microcomputer carries out data analysis through a first UART (Universal Asynchronous Receiver/Transmitter), if the analyzed satellite signals have faults, the single chip microcomputer sends the satellite signals to the TD-LTD baseband synchronous module through a second UART, fault warning information is transmitted to the warning platform through network signals (such as 4G/3G wireless signals), and warning removing information is sent to the warning platform after the faults are removed.
To sum up, the utility model provides a 5G little basic station synchronous time service device, wherein set up GNSS antenna and GNSS receiver and receive satellite signal, through a plurality of 485 chips and a plurality of RJ45 interfaces connected with it, for carrying out the synchronous time service with a plurality of 5G little basic stations of RJ45 interface one-to-one, realize setting up a synchronous time service device and carrying out the time service for a plurality of 5G little basic stations, avoided every little basic station all need set up the cost that GNSS received the synchronous module, practiced thrift the cost; and the TD-LTE baseband synchronization module is also arranged to acquire the network signal at the same time, frequency division is carried out on the network signal according to the received satellite signal, and time service can be continuously carried out according to the stored frequency-divided signal when the satellite signal fails, so that the continuity and stability of the time service are ensured.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (6)
1. A5G small base station synchronous time service device is characterized by comprising a GNSS receiver, a TD-LTE baseband synchronization module, a selector and a plurality of RJ45 interfaces, wherein a first output end of the GNSS receiver is connected with a first input end of the selector;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the selector;
the selector is provided with a plurality of output ends which are respectively connected with a plurality of RJ45 interfaces;
and a plurality of 5G small base stations can be connected to a plurality of RJ45 interfaces in a one-to-one correspondence manner.
2. The 5G small base station synchronous time service device according to claim 1, further comprising a synchronous frequency divider;
the first output end of the GNSS receiver is also connected with the first input end of the synchronous frequency divider;
the output end of the TD-LTE baseband synchronization module is connected with the second input end of the synchronization frequency divider;
the output end of the synchronous frequency divider is connected with the second input end of the selector.
3. The device as claimed in claim 1, further comprising a GNSS antenna, wherein the GNSS antenna is connected to an input terminal of the GNSS receiver.
4. The 5G small base station synchronous time service device according to claim 1, further comprising a single chip microcomputer and an alarm platform;
the input end of the singlechip is connected with the second output end of the GNSS receiver;
the bidirectional communication end of the single chip microcomputer is connected with the first bidirectional communication end of the TD-LTE baseband synchronization module;
in the single chip microcomputer, the input end of the single chip microcomputer is connected with a first UART, and the bidirectional communication end of the single chip microcomputer is connected with a second UART;
and a second bidirectional communication end of the TD-LTE baseband synchronization module is connected with the alarm platform.
5. The 5G small base station synchronous time service device according to claim 1, further comprising a plurality of 485 chips;
the input ends of the 485 chips are respectively connected with the output ends of the selector;
the output ends of the 485 chips are respectively connected with the RJ45 interfaces;
the RJ45 interface is connected to a direct-connected twisted pair network cable.
6. The 5G small base station synchronization time service device according to claim 1, wherein the TD-LTD baseband synchronization module is HR-TD-03A in model number.
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| CN202022148810.5U CN212752646U (en) | 2020-09-27 | 2020-09-27 | 5G small base station synchronous time service device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112055407A (en) * | 2020-09-27 | 2020-12-08 | 安科讯(福建)科技有限公司 | 5G small base station synchronous time service method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112055407A (en) * | 2020-09-27 | 2020-12-08 | 安科讯(福建)科技有限公司 | 5G small base station synchronous time service method and device |
| CN112055407B (en) * | 2020-09-27 | 2024-06-21 | 安科讯(福建)科技有限公司 | Synchronous time service method and device for 5G small cell |
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