5g extended picocell system and control method thereof

Abstract

This invention relates to the field of extended picocell base station technology, and particularly to a 5G extended picocell base station system and its control method. The system includes a picocell host and several extension units. The picocell host includes a first GNSS receiver, a first clock synchronization generator, and a first digital integrated circuit chip. Each extension unit includes a second GNSS receiver, a second clock synchronization generator, and a second digital integrated circuit chip. The first clock synchronization generator is electrically connected to both the first GNSS receiver and the first digital integrated circuit chip. The second clock synchronization generator is electrically connected to both the second GNSS receiver and the second digital integrated circuit chip. The first digital integrated circuit chip is electrically connected to the second digital integrated circuit chip. This allows for rapid switching to other reference sources when the GNSS receiver malfunctions and cannot output a reference 1pps timing pulse, thereby improving synchronization stability.

Description

[0001] This case is a divisional application of the invention patent with the application date of June 2, 2021, the application number of CN202110614961.1, and the name of a 5G extended skin base station redundant time synchronization device and its control method. TECHNICAL FIELD

[0002] The present application relates to the technical field of extended skin base stations, in particular to a 5G extended skin base station system and its control method. BACKGROUND

[0003] In wireless communication, in order to cope with the Doppler effect of wireless signals and the interference of adjacent base stations under the same frequency networking, 3GPP has strict requirements for the frequency accuracy and time accuracy of base stations. Especially for 5G wireless networks, due to the application of new technologies such as carrier aggregation, multi-MIMO, 5G ultra-short frame structure, high-precision positioning, and more complex synchronization scenarios, higher requirements are put forward for the clock synchronization accuracy between base stations. In order to meet the demand for clock synchronization accuracy, base stations mainly obtain standard clock through two ways: GNSS receiver satellite time service and IEEE1588 time service.

[0004] The synchronization accuracy of IEEE1588 time service will fluctuate with network traffic. The way of time synchronization by receiving the reference 1pps pulse signal of GNSS receiver satellite is one of the common time synchronization methods for 5G extended skin base stations. In actual application, due to the influence of various uncertain factors, GNSS receiver satellite time synchronization may appear abnormal. In order to ensure that wireless communication continues to operate normally within a certain period of time and reduce the impact on terminal customers, operators require that the clock of 5G extended skin base station should be synchronized within a certain period of time, that is, the clock keeping requirement. Based on the important position of small base stations, operators continue to put forward more stringent clock keeping requirements for 5G macro base stations, and also put forward the clock keeping requirement for small base stations. Generally, small base station clock synchronization needs to be kept for 8-24 hours.

[0005] To realize the function of clock keeping for a long time, a crystal oscillator with very high precision and frequency stability is needed, as well as a complex keeping algorithm. And with the passage of time, the synchronization accuracy will become worse and worse. If the maintenance personnel cannot handle it in time, it will cause communication failure. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a 5G extended skin base station redundant time synchronization device and its control method, so as to ensure that the installed 5G extended skin base station is synchronized with the reference with complete GNSS receiver time service.

[0007] In order to solve the above technical problems, the first technical scheme adopted by the present application is:

[0008] A 5G extended skin base station redundant time service synchronization device, comprising a skin host and two or more extension units, the skin host comprising a first GNSS receiver, a first clock synchronization generator and a first digital integrated circuit chip, the extension unit comprising a second GNSS receiver, a second clock synchronization generator and a second digital integrated circuit chip, the first clock synchronization generator being electrically connected with the first GNSS receiver and the first digital integrated circuit chip respectively, the second clock synchronization generator being electrically connected with the second GNSS receiver and the second digital integrated circuit chip respectively, and the first digital integrated circuit chip being electrically connected with the second digital integrated circuit chip.

[0009] The second technical solution adopted by the present application is:

[0010] A control method of a 5G extended skin base station redundant time service synchronization device, comprising the following steps:

[0011] S1, controlling the first GNSS receiver in the skin host to output a reference signal of 1pps to the first clock synchronization generator in the skin host, and taking the reference signal as a reference reference signal;

[0012] S2, judging whether the first clock synchronization generator in the skin host outputs a high level;

[0013] S3, if yes, it is determined that the clock of the system has been in a synchronous state, and the first digital integrated circuit chip in the skin host is controlled to transmit the reference reference signal to the second digital integrated circuit chip in each extension unit; the second digital integrated circuit chip in the extension unit is controlled to transmit a recovered clock signal to the second clock synchronization generator, and after the second clock synchronization generator in the extension unit receives the recovered clock signal, the second clock synchronization generator in the extension unit is controlled to transmit a synchronous clock signal to the second digital integrated circuit chip.

[0014] The present application has the following advantages:

[0015] By deploying multiple GNSS receivers in the skin host and the extension unit respectively, the 5G extended skin base station can be provided with redundant time service, and after the GNSS receiver fails to output the reference 1pps time service pulse, it can be quickly switched to other reference source, thereby ensuring the continuity of time service and improving the stability of synchronization, without the need to increase expensive clock keeping modules, thereby reducing the overall cost of the base station. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a connection block diagram of a 5G extended skin base station redundant time service synchronization device according to the present application;

[0017] Figure 2 A step flow chart of a control method of a 5G extended skin base station redundant time service synchronization device according to the present application;

[0018] Label description:

[0019] 1, skin station host; 101, first GNSS receiver; 102, first clock synchronization generator; 103, first digital integrated circuit chip;

[0020] 2, extension unit; 201, second GNSS receiver; 202, second clock synchronization generator; 203, second digital integrated circuit chip;

[0021] 3, radio frequency unit. DETAILED DESCRIPTION

[0022] In order to explain the technical content, the purpose and effect of the present application in detail, the following will be described in conjunction with the embodiments and the accompanying drawings.

[0023] Please refer to Figure 1 The present application provides a technical solution:

[0024] A 5G extended skin base station redundant time service synchronization device, comprising a skin station host and two or more extension units, the skin station host comprising a first GNSS receiver, a first clock synchronization generator and a first digital integrated circuit chip, the extension unit comprising a second GNSS receiver, a second clock synchronization generator and a second digital integrated circuit chip, the first clock synchronization generator being electrically connected with the first GNSS receiver and the first digital integrated circuit chip respectively, the second clock synchronization generator being electrically connected with the second GNSS receiver and the second digital integrated circuit chip respectively, and the first digital integrated circuit chip being electrically connected with the second digital integrated circuit chip.

[0025] From the above description, the beneficial effects of the present application are as follows:

[0026] By deploying multiple GNSS receivers in the skin station host and the extension unit respectively, the 5G extended skin base station can be provided with redundant time service, and after the GNSS receiver fails to output the reference 1pps timing pulse, it can be quickly switched to other reference source, ensuring the continuity of time service while improving the stability of synchronization, without the need to increase expensive clock keeping module, reducing the overall cost of the base station.

[0027] Further, the first digital integrated circuit chip and the second digital integrated circuit chip are connected through a cpri interface.

[0028] Further, the output end of the first GNSS receiver is connected with the input end of the first clock synchronization generator.

[0029] Further, the output end of the second GNSS receiver is connected with the input end of the second clock synchronization generator.

[0030] Please refer to Figure 2 The application provides another technical scheme:

[0031] A control method of a 5G extended leather base station redundant time service synchronization device, comprising the following steps:

[0032] S1, outputting a reference signal of 1pps of a first GNSS receiver in a leather station host to a first clock synchronization generator in the leather station host, and taking the reference signal as a reference reference signal;

[0033] S2, judging whether the first clock synchronization generator in the leather station host outputs a high level;

[0034] S3, if yes, it is determined that the clock of the system is in a synchronization state, and the first digital integrated circuit chip in the leather station host is controlled to transmit the reference reference signal to the second digital integrated circuit chip in each extension unit; the second digital integrated circuit chip in the extension unit is controlled to transmit a recovered clock signal to the second clock synchronization generator, and after the second clock synchronization generator in the extension unit receives the recovered clock signal, the second clock synchronization generator in the extension unit is controlled to transmit a synchronization clock signal to the second digital integrated circuit chip.

[0035] From the above description, the beneficial effects of the application are as follows:

[0036] By controlling the first GNSS receiver in the leather station host to output a reference signal of 1pps to the first clock synchronization generator in the leather station host, and taking the reference signal as a reference reference signal, then judging whether the first clock synchronization generator in the leather station host outputs a high level, if yes, it is determined that the clock of the system is in a synchronization state, and the first digital integrated circuit chip in the leather station host is controlled to transmit the reference reference signal to the second digital integrated circuit chip in each extension unit, the second digital integrated circuit chip in the extension unit is controlled to transmit a recovered clock signal to the second clock synchronization generator, and after the second clock synchronization generator in the extension unit receives the recovered clock signal, the second clock synchronization generator in the extension unit is controlled to transmit a synchronization clock signal to the second digital integrated circuit chip. In this way, the 5G extended leather base station can be provided with redundant time service, after the GNSS receiver fails to output the reference 1pps time service pulse, it can be quickly switched to other reference source, while ensuring the continuity of time service, the stability of synchronization is improved, without the need to increase the expensive clock keeping module, the overall cost of the base station is reduced.

[0037] Further, step S3 further comprises the following steps:

[0038] If the first clock synchronization generator in the skin station host outputs low level, it is determined that the first GNSS receiver in the skin station host is in a fault state; the first digital integrated circuit chip in the skin station host is controlled to transmit the fault information of the first GNSS receiver to the second clock synchronization generator in the first extension unit; after the second clock synchronization generator in the first extension unit receives the fault information, the second clock synchronization generator in the first extension unit is controlled to adjust from the recovery clock state to the synchronous clock state;

[0039] It is determined whether the second clock synchronization generator in the first extension unit outputs high level;

[0040] If yes, it is determined that the clock of the system has been in the synchronous state.

[0041] Further, the specific steps of controlling the second clock synchronization generator in the first extension unit to adjust from the recovery clock state to the synchronous clock state are as follows:

[0042] The second GNSS receiver in the first extension unit is controlled to output the reference signal of 1pps to the second clock synchronization generator in the first extension unit;

[0043] The reference source of the second clock synchronization generator in the first extension unit is controlled to adjust from the recovery clock signal to the reference signal of 1pps output by the second GNSS receiver in the first extension unit for the clock synchronization of the system.

[0044] Further, if the second clock synchronization generator in the first extension unit outputs low level, it is determined that the second GNSS receiver in the first extension unit is in a fault state;

[0045] The second digital integrated circuit chip in the first extension unit is controlled to transmit the fault information of the second GNSS receiver in the first extension unit to the first digital integrated circuit chip in the skin station host; after the first digital integrated circuit chip in the skin station host receives the fault information, the second clock synchronization generator in the second extension unit is controlled to adjust from the recovery clock state to the synchronous clock state;

[0046] It is determined whether the second clock synchronization generator in the second extension unit outputs high level;

[0047] If yes, it is determined that the clock of the system has been in the synchronous state.

[0048] Further, the specific steps of controlling the second clock synchronization generator in the second extension unit to adjust from the recovery clock state to the synchronous clock state are as follows:

[0049] controlling the second GNSS receiver in the second extension unit to output a 1pps reference signal to a second clock synchronization generator in the second extension unit;

[0050] controlling the reference source of the second clock synchronization generator in the second extension unit to adjust from the recovered clock signal to the 1pps reference signal output by the second GNSS receiver in the second extension unit for system clock synchronization.

[0051] Please refer to Figure 1 Embodiment one of the present application is:

[0052] A 5G extension type skin base station redundant time synchronization device, comprising a skin host 1 and two or more extension units 2, the skin host 1 comprises a first GNSS receiver 101, a first clock synchronization generator 102 and a first digital integrated circuit chip 103, the extension unit 2 comprises a second GNSS receiver 201, a second clock synchronization generator 202 and a second digital integrated circuit chip 203, the first clock synchronization generator 102 is respectively connected with the first GNSS receiver 101 and the first digital integrated circuit chip 103, the second clock synchronization generator 202 is respectively connected with the second GNSS receiver 201 and the second digital integrated circuit chip 203, and the first digital integrated circuit chip 103 is connected with the second digital integrated circuit chip 203.

[0053] The first digital integrated circuit chip 103 and the second digital integrated circuit chip 203 are connected through a cpri interface.

[0054] The output end of the first GNSS receiver 101 is connected with the input end of the first clock synchronization generator 102.

[0055] The output end of the second GNSS receiver 201 is connected with the input end of the second clock synchronization generator 202.

[0056] In the case that the first GNSS receiver 101 in the skin station host 1 works normally, the first GNSS receiver 101 on the skin station host 1 can stably output the reference 1pps second pulse signal as the synchronization pulse signal, which is provided to the skin station host 1 as the clock synchronization reference source, and is transmitted to the expansion unit 2 through the cpri interface, and the expansion unit 2 recovers the synchronization clock from the cpri interface to provide the system for use. If the first GNSS receiver 101 in the skin station host 1 appears abnormal, the first GNSS receiver 101 cannot generate the reference 1pps second pulse signal, and the system quickly switches to use the reference 1pps generated by the second GNSS receiver 201 deployed on the first expansion unit 2 as the synchronization signal, which is transmitted to the skin station host 1 through the cpri interface signal. If the second GNSS receiver 201 on the first expansion unit 2 also fails, the second GNSS receiver 201 on the second expansion unit 2 is used as the reference signal and provided to the skin station host 1. The above process is repeated. After the skin station host 1 recovers from the fault, the synchronization reference source is switched back to the GNSS receiver of the skin station host 1. The specific analysis is as follows:

[0057] After the 5G extended skin station redundant timing synchronization device is installed, the reference 1pps signal generated by the first GNSS receiver 101 installed in the skin station host 1 is input to the first clock synchronization generator 102 as the reference, which generates a stable synchronization clock for the first digital integrated circuit chip 103 on the skin station host 1. At the same time, the first clock synchronization generator 102 outputs a high level state indicating that the system clock has been synchronized. The first digital integrated circuit chip 103 transmits the clock to different expansion units 2 through the cpri interface, and the second digital integrated circuit chip 203 in the expansion unit 2 recovers the clock from the cpri interface to provide the second clock synchronization generator 202 in the expansion unit 2, which generates a stable synchronization clock to keep the system clock and the reference 1pps signal generated by the GNSS receiver in a synchronization locked state.

[0058] When the first GNSS receiver 101 installed on the skin station host 1 fails to generate a reference 1pps signal, the synchronization state pin of the first clock synchronization generator 102 in the skin station host 1 outputs a low level state indicating that the system clock has lost the synchronization reference source, and enters a 30-minute holding mode. The skin station host 1 transmits this fault information to the first extension unit 2 through the cpri interface. After receiving the fault information, the first extension unit 2 quickly adjusts the reference source of the second clock synchronization generator 202 on the first extension unit 2 from the recovery clock of the first digital integrated circuit chip 103 to the reference 1pps reference signal generated by the second GNSS receiver 201 on the first extension unit 2, and performs system clock synchronization. When the synchronization state pin of the second clock synchronization generator 202 on the first extension unit 2 outputs a high level state indicating that the system clock has completed synchronization with the reference 1pps, the first digital integrated circuit chip 103 on the first extension unit 2 transmits to the skin station host 1 through the cpri interface. The synchronization source of the skin station host 1 is switched from the original reference 1pps to the FPGA recovery clock of the skin station host 1, generating a stable synchronization clock for the system and the remaining extension units 2.

[0059] When the second GNSS receiver 201 in the first extension unit 2 also fails to generate a reference 1pps signal, the synchronization state pin of the second clock synchronization generator 202 in the first extension unit 2 outputs a low level state indicating that the clock has lost the synchronization reference source, and enters a 30-minute holding mode. The first extension unit 2 transmits this fault information to the skin station host 1 through the cpri interface. After receiving the fault information, the skin station host 1 informs the second clock synchronization generator 202 on the second extension unit 2 to adjust the reference source from the recovery clock of the second digital integrated circuit chip 203 of the second extension unit 2 to the reference 1pps reference signal generated by the second GNSS receiver 201 in the second extension unit 2, generating a stable synchronization clock. When the synchronization state pin of the second clock synchronization generator 202 on the second extension unit 2 outputs a high level state indicating that the clock has completed synchronization with the reference 1pps, the second digital integrated circuit chip 203 on the second extension unit 2 transmits to the skin station host 1 through the cpri interface, and informs the first extension unit 2 to switch the clock source to the recovery clock of the second digital integrated circuit chip 203 in the first extension unit 2. The clock source of the skin station host 1 is provided by the second extension unit 2, generating a stable synchronization clock for the system and the remaining extension units 2. When the second GNSS receiver 201 of the second extension unit 2 fails, the system also switches the clock synchronization source to the third extension unit 2 in the same way, and so on to achieve the purpose of system redundant synchronization.

[0060] When the first GNSS receiver 101 of the skin station host 1 is out of fault and returns to normal, the skin station host 1 informs each extension unit 2 and switches the clock source to the recovery clock provided by the skin station host 1, and the synchronization source of the first clock synchronization generator 102 in the skin station host 1 selects the reference 1pps of the first GNSS receiver 101 as a reference, so that the whole system clock is kept in a synchronization state.

[0061] The 5G extended skin base station system is composed of a skin station host 1, an extension unit 2 and a radio frequency unit 3. The skin station host 1 mainly completes functions such as modulation and demodulation of baseband signals, wireless resource management, mobility management, physical layer processing, device state monitoring and the like. One skin station host 1 can be connected with at least four extension units 2. The extension unit 2 mainly completes functions such as data branching and merging, data forwarding, physical layer low layer and the like. One extension unit 2 can be connected with at least eight radio frequency units 3. The radio frequency unit 3 mainly completes radio frequency processing and transceiving of wireless signals. Since the 5G extended skin base station is composed of three units, multiple devices are formed to provide device and application support for redundant synchronization. The scheme guarantees the stability of the synchronization of the 5G extended skin base station through a 5G extended skin base station redundant synchronization timing device without increasing expensive holding modules, and has high practical value.

[0062] Please refer to Figure 2 , the second embodiment of the present application is:

[0063] A control method of a 5G extended skin base station redundant timing synchronization device, comprising the following steps:

[0064] S1, control the first GNSS receiver 101 in the skin station host 1 to output a reference signal of 1pps to the first clock synchronization generator 102 in the skin station host 1, and take the reference signal as a reference reference signal;

[0065] S2, judge whether the first clock synchronization generator 102 in the skin station host 1 outputs a high level;

[0066] S3, if yes, it is judged that the clock of the system has been in a synchronization state, and the first digital integrated circuit chip 103 in the skin station host 1 is controlled to transmit the reference reference signal to the second digital integrated circuit chip 203 in each extension unit 2; the second digital integrated circuit chip 203 in the extension unit 2 is controlled to transmit a recovery clock signal to the second clock synchronization generator 202, and after the second clock synchronization generator 202 in the extension unit 2 receives the recovery clock signal, the second clock synchronization generator 202 in the extension unit 2 is controlled to transmit a synchronization clock signal to the second digital integrated circuit chip 203.

[0067] Step S3 further comprises the following steps:

[0068] If the first clock synchronization generator 102 in the skin station host 1 outputs low level, it is determined that the first GNSS receiver 101 in the skin station host 1 is in a fault state; the first digital integrated circuit chip 103 in the skin station host 1 is controlled to transmit the fault information of the first GNSS receiver 101 to the second clock synchronization generator 202 in the first extension unit 2; after the second clock synchronization generator 202 in the first extension unit 2 receives the fault information, the second clock synchronization generator 202 in the first extension unit 2 is controlled to adjust from the recovery clock state to the synchronous clock state;

[0069] It is determined whether the second clock synchronization generator 202 in the first extension unit 2 outputs high level or not.

[0070] If yes, it is determined that the clock of the system has been in the synchronous state.

[0071] The specific steps for controlling the second clock synchronization generator 202 in the first extension unit 2 to adjust from the recovery clock state to the synchronous clock state are as follows:

[0072] The second GNSS receiver 201 in the first extension unit 2 is controlled to output the reference signal of 1pps to the second clock synchronization generator 202 in the first extension unit 2;

[0073] The reference source of the second clock synchronization generator 202 in the first extension unit 2 is controlled to adjust from the recovery clock signal to the reference signal of 1pps output by the second GNSS receiver 201 in the first extension unit 2 for the clock synchronization of the system.

[0074] If the second clock synchronization generator 202 in the first extension unit 2 outputs low level, it is determined that the second GNSS receiver 201 in the first extension unit 2 is in a fault state;

[0075] The second digital integrated circuit chip 203 in the first extension unit 2 is controlled to transmit the fault information of the second GNSS receiver 201 in the first extension unit 2 to the first digital integrated circuit chip 103 in the skin station host 1; after the first digital integrated circuit chip 103 in the skin station host 1 receives the fault information, the second clock synchronization generator 202 in the second extension unit 2 is controlled to adjust from the recovery clock state to the synchronous clock state;

[0076] It is determined whether the second clock synchronization generator 202 in the second extension unit 2 outputs high level or not.

[0077] If yes, it is determined that the clock of the system has been in the synchronous state.

[0078] The specific steps for controlling the second clock synchronization generator 202 in the second extension unit 2 to adjust from the recovery clock state to the synchronous clock state are as follows:

[0079] controlling the second GNSS receiver 201 in the second extension unit 2 to output a 1pps reference signal to the second clock synchronization generator 202 in the second extension unit 2;

[0080] controlling the reference source of the second clock synchronization generator 202 in the second extension unit 2 to adjust from the recovered clock signal to the 1pps reference signal output by the second GNSS receiver 201 in the second extension unit 2 for system clock synchronization.

[0081] The specific embodiment of the control method of the 5G extension type skin base station redundant time synchronization device designed in the scheme is:

[0082] After the 5G extension type skin base station redundant time synchronization device designed in the scheme is installed, the reference 1pps signal generated by the first GNSS receiver 101 installed in the skin base station host 1 is input to the first clock synchronization generator 102 as a reference, and a stable synchronization clock is generated and provided to the first digital integrated circuit chip 103 on the skin base station host 1. At the same time, the first clock synchronization generator 102 outputs a high level state indicating that the system clock has been synchronized through the pin, and the first digital integrated circuit chip 103 transmits it to different extension units 2 through the cpri interface. The second digital integrated circuit chip 203 in the extension unit 2 recovers the clock from the cpri interface and provides it to the second clock synchronization generator 202 in the extension unit 2, generates a stable synchronization clock, and keeps the system clock and the reference 1pps signal generated by the GNSS receiver in a synchronous locked state.

[0083] After the first GNSS receiver 101 installed on the skin base station host 1 fails to generate a reference 1pps signal, the synchronization state pin of the first clock synchronization generator 102 in the skin base station host 1 outputs a low level state indicating that the system clock has lost the synchronization reference source and enters a 30-minute hold mode. The skin base station host 1 transmits this fault information to the first extension unit 2 through the cpri interface. After receiving the fault information, the first extension unit 2 quickly adjusts the reference source of the second clock synchronization generator 202 in the first extension unit 2 from the recovered clock of the first digital integrated circuit chip 103 to the reference 1pps reference signal generated by the second GNSS receiver 201 in the first extension unit 2, and performs system clock synchronization. When the synchronization state pin of the second clock synchronization generator 202 in the first extension unit 2 outputs a high level state indicating that the system clock has completed synchronization with the reference 1pps, the first digital integrated circuit chip 103 in the first extension unit 2 transmits it to the skin base station host 1 through the cpri interface. The synchronization source of the skin base station host 1 is switched from the original reference 1pps to the FPGA recovered clock of the skin base station host 1, which generates a stable synchronization clock for the system and the remaining extension units 2.

[0084] When the second GNSS receiver 201 in the first extension unit 2 also fails to generate the reference 1pps signal, the synchronization state pin of the second clock synchronization generator 202 in the first extension unit 2 outputs a low level state indicating that the clock has lost the synchronization reference source and enters the 30-minute hold mode. The first extension unit 2 transmits this fault information to the skin station host 1 through the cpri interface. After the skin station host 1 receives the fault information, it informs the second clock synchronization generator 202 in the second extension unit 2 to switch the reference source from the recovery clock of the second digital integrated circuit chip 203 in the second extension unit 2 to the reference 1pps reference signal generated by the second GNSS receiver 201 in the second extension unit 2 to generate a stable synchronization clock. After the synchronization state pin of the second clock synchronization generator 202 in the second extension unit 2 outputs a high level state indicating that the clock has synchronized with the reference 1pps, the second digital integrated circuit chip 203 in the second extension unit 2 transmits to the skin station host 1 through the cpri interface and informs the first extension unit 2 to switch the clock source to the recovery clock of the second digital integrated circuit chip 203 in the first extension unit 2. The clock source of the skin station host 1 is provided by the second extension unit 2 to generate a stable synchronization clock to provide the system and the remaining extension units 2. When the second GNSS receiver 201 in the second extension unit 2 fails, the system also switches the clock synchronization source to the third extension unit 2 in the same way, and so on to achieve the purpose of system redundancy synchronization.

[0085] When the first GNSS receiver 101 of the skin station host 1 recovers from failure and returns to normal, the skin station host 1 informs each extension unit 2 to switch the clock source to the recovery clock provided by the skin station host 1. The first clock synchronization generator 102 in the skin station host 1 selects the reference 1pps of the first GNSS receiver 101 as the reference to keep the entire system clock in a synchronized state.

[0086] 5G extended skin base station system is composed of three parts of skin host 1, extension unit 2 and radio frequency unit 3. The skin host 1 mainly completes the functions of baseband signal modulation and demodulation, wireless resource management, mobility management, physical layer processing, equipment state monitoring and the like. One skin host 1 can connect at least four extension units 2. The extension unit 2 mainly completes the functions of data branching and merging, data forwarding, physical layer low layer and the like. One extension unit 2 can connect at least eight radio frequency units 3. The radio frequency unit 3 mainly completes the radio frequency processing and the transmission and reception of wireless signals. Since the 5G extended skin base station is composed of three units, multiple devices are connected to provide equipment and application support for redundant synchronization. The scheme uses a 5G extended skin base station redundant synchronization timing device, without increasing the expensive holding module, to ensure the stability of the 5G extended skin base station synchronization, and has high practical value.

[0087] In summary, the 5G extended skin base station redundant timing synchronization device and the control method thereof provided by the application can stably output the reference 1pps second pulse signal as the synchronization pulse signal from the first GNSS receiver on the skin host under the condition that the first GNSS receiver in the skin host works normally, provide the skin host as the clock synchronization reference source, and transmit the synchronization clock recovered from the cpri interface to the extension unit for system use. If the first GNSS receiver in the skin host is abnormal and the first GNSS receiver cannot generate the reference 1pps second pulse signal, the system quickly switches to use the reference 1pps generated by the second GNSS receiver arranged on the first extension unit as the synchronization signal, and transmits the synchronization information to the skin host through the cpri interface signal. If the second GNSS receiver on the first extension unit also fails, the second GNSS receiver on the second extension unit is used as the reference signal and provided to the skin host. The above process is repeated. After the skin host recovers from the fault, the synchronization reference source is switched back to the GNSS receiver of the skin host. By arranging multiple GNSS receivers on the skin host and the extension unit, the 5G extended skin base station can be redundantly timed. After the GNSS receiver fails to output the reference 1pps timing pulse, the system can quickly switch to other reference sources, ensure the continuity of the timing, improve the stability of the synchronization, and does not need to increase the expensive clock holding module, thereby reducing the overall cost of the base station.

[0088] The above description is only an embodiment of the application, and does not limit the patent range of the application. Any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and the drawings is also included in the patent protection range of the application.

Claims

1. A control method for a 5G extended pico base station system, characterized in that, The system includes a picostation host and two or more expansion units. The picostation host includes a first GNSS receiver, a first clock synchronization generator, and a first digital integrated circuit chip. The expansion unit includes a second GNSS receiver, a second clock synchronization generator, and a second digital integrated circuit chip. The first clock synchronization generator is electrically connected to the first GNSS receiver and the first digital integrated circuit chip, respectively. The second clock synchronization generator is electrically connected to the second GNSS receiver and the second digital integrated circuit chip, respectively. The first digital integrated circuit chip is electrically connected to the second digital integrated circuit chip. The output of the first GNSS receiver is connected to the input of the first clock synchronization generator; The output of the second GNSS receiver is connected to the input of the second clock synchronization generator; Includes the following steps: S1. Control the first GNSS receiver in the picocell host to output a 1pps reference signal to the first clock synchronization generator in the picocell host, and use the reference signal as a reference signal; S2. Determine whether the first clock synchronization generator in the picostation host outputs a high level; S3. If so, determine that the system clock is in a synchronized state, and control the first digital integrated circuit chip in the pico station host to transmit the reference signal to the second digital integrated circuit chip in each expansion unit; control the second digital integrated circuit chip in the expansion unit to transmit the recovery clock signal to the second clock synchronization generator, and after the second clock synchronization generator in the expansion unit receives the recovery clock signal, control the second clock synchronization generator in the expansion unit to transmit the synchronization clock signal to the second digital integrated circuit chip.

2. The control method for the 5G extended pico base station system according to claim 1, characterized in that, The first digital integrated circuit chip and the second digital integrated circuit chip are connected via a CPRI interface.

3. The control method for the 5G extended pico base station system according to claim 1, characterized in that, Step S3 also includes the following steps: If the first clock synchronization generator in the picostation host outputs a low level, it is determined that the first GNSS receiver in the picostation host is in a fault state; the first digital integrated circuit chip in the picostation host is controlled to transmit the fault information of the first GNSS receiver to the second clock synchronization generator in the first expansion unit; after receiving the fault information, the second clock synchronization generator in the first expansion unit is controlled to adjust from the recovery clock state to the synchronization clock state. Determine whether the second clock synchronization generator in the first expansion unit outputs a high level; If so, then the system clock is determined to be in a synchronized state.

4. The control method for the 5G extended pico base station system according to claim 3, characterized in that, The specific steps for controlling the second clock synchronization generator in the first expansion unit to adjust from the recovery clock state to the synchronization clock state are as follows: The second GNSS receiver in the first expansion unit outputs a 1pps reference signal to the second clock synchronization generator in the first expansion unit; The reference source of the second clock synchronization generator in the first expansion unit is adjusted from the recovered clock signal to the 1pps reference signal output by the second GNSS receiver in the first expansion unit for system clock synchronization.

5. The control method for the 5G extended pico base station system according to claim 3, characterized in that, If the second clock synchronization generator in the first expansion unit outputs a low level, the second GNSS receiver in the first expansion unit is determined to be in a fault state. The second digital integrated circuit chip in the first expansion unit transmits the fault information of the second GNSS receiver in the first expansion unit to the first digital integrated circuit chip in the pico station host; after the first digital integrated circuit chip in the pico station host receives the fault information, it controls the second clock synchronization generator in the second expansion unit to adjust from the recovery clock state to the synchronization clock state. Determine whether the second clock synchronization generator in the second expansion unit outputs a high level; If so, then the system clock is determined to be in a synchronized state.

6. The control method for the 5G extended pico base station system according to claim 5, characterized in that, The specific steps for controlling the second clock synchronization generator within the second expansion unit to switch from a recovery clock state to a synchronization clock state are as follows: The second GNSS receiver in the second expansion unit outputs a 1pps reference signal to the second clock synchronization generator in the second expansion unit; The reference source of the second clock synchronization generator in the second expansion unit is adjusted from the recovered clock signal to the 1pps reference signal output by the second GNSS receiver in the second expansion unit for system clock synchronization.

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