CN117615412A - Time delay self-adjusting method of 5G repeater system - Google Patents

Time delay self-adjusting method of 5G repeater system Download PDF

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Publication number
CN117615412A
CN117615412A CN202410093454.1A CN202410093454A CN117615412A CN 117615412 A CN117615412 A CN 117615412A CN 202410093454 A CN202410093454 A CN 202410093454A CN 117615412 A CN117615412 A CN 117615412A
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delay
downlink
time delay
inherent
data
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CN117615412B (en
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陈仲甫
徐捷
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Nanjing Digitgate Technology Co ltd
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Nanjing Digitgate Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Abstract

The invention discloses a time delay self-adjusting method of a 5G repeater system, belongs to the technical field of 5G communication, and solves the problem that in the 5G repeater system, in a time division multiplexing TDD mode, due to the fact that an air interface, a 10ms NR wireless frame header and NR data cannot be aligned accurately, the NR data is cut, and therefore the NR service rate is affected. Firstly, calculating the system inherent time delays of an AU uplink and an AU downlink of a near-end unit, then calculating the optical fiber time delays of the AU and the RU, then calculating the system inherent time delays of the RU uplink and the RU downlink of a far-end unit, then aligning the system inherent time delays of the AU uplink and the RU downlink respectively, and then setting a 10ms NR wireless frame head and a delay value as the time length of the downlink inherent time delay of the system. And finally, verifying whether the downlink data and the uplink data interfere with each other in the special time slot, and selecting whether to trigger the warning lamp according to the mutual interference.

Description

Time delay self-adjusting method of 5G repeater system
Technical Field
The invention relates to a 5G communication system, which solves the problem that in a 5G repeater system, in a time division multiplexing TDD mode, due to the fact that an air interface, a 10ms NR wireless frame header and NR data cannot be aligned accurately, the NR data is cut, and therefore the NR service rate is affected.
Background
In the 5G repeater system, since the repeater is located at the back end of the base station and is composed of the near end unit AU and the far end unit RU, the positions of the frame head and the data of the 10ms nr wireless frame are changed relative to the air interface in the transmission process. This means that after the signal exits from the antenna port at the transmitting end of the repeater RU, the positions of the air port, data and frame header are not aligned, so that the data of NR is cut and the traffic rate is affected. In the debugging process, even the same repeater system and different base station systems are required to be debugged by means of an oscilloscope or a frequency spectrograph every time, so that empirical values are searched. This can lead to a series of problems such as the accuracy of the final result being not guaranteed, the performance of the system being affected, the efficiency being too low.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a delay self-adjusting method of a 5G repeater system. The method solves the problem that in a 5G repeater system, in a time division multiplexing TDD mode, due to the fact that an air interface, a 10ms NR wireless frame header and NR data cannot be aligned accurately, the NR data is cut, and therefore NR service rate is affected.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the system inherent time delays of the uplink and the downlink of the AU of the near-end unit are calculated, then the optical fiber time delays of the AU and the RU are calculated, then the system inherent time delays of the uplink and the downlink of the RU of the far-end unit are calculated, then the system inherent time delays of the uplink and the downlink of the AU and the RU are respectively aligned, then the frame head of the 10ms NR wireless frame is set, and the delay value is the time length of the downlink inherent time delay of the system. Finally, verifying whether the downlink data and the uplink data interfere with each other in the special time slot, and selecting whether to trigger the warning lamp according to the mutual interference, wherein the method specifically comprises the following steps:
step one, calculating the system inherent time delay t_au_dl of an AU downlink;
step two, calculating the optical fiber time delay t_fiber between AU and RU;
step three, calculating the system inherent time delay t_au_ul of the AU uplink;
aligning the inherent time delay of the uplink and downlink systems of the AU;
step five, calculating the system inherent time delay t_ru_dl of the RU downlink;
step six, calculating the system inherent time delay t_ru_ul of the RU uplink;
aligning the system inherent time delay of the uplink and the downlink of the RU;
step eight, in the RU, according to the position relation of the data relative to the air interface, adjusting the frame head of the 10msNR wireless frame to a position aligned with the initial position of the data;
step nine, verifying whether the downlink data and the uplink data interfere with each other in the special time slot.
The first step is specifically as follows: because the front end of the repeater is the RRU at the base station side, when the RRU transmits signals, the initial positions of the air interface and the 10ms NR wireless frame head are aligned, the position of the air interface is fixed in the data transmission process, namely, the situation that data is advanced or lagged relative to the air interface is possible, at the repeater side, the data enters from the antenna port of the AU, then, along with a data link, time delay is generated, the position of the 10ms NR wireless frame head is not changed, and the time delay difference between the 10ms NR wireless frame head and the initial position of the downlink data at the common public interface cpri side is counted. Because the data issued by the RRU at the base station side can be advanced or delayed relative to the air interface, when the data is advanced relative to the air interface, the absolute value of the advance is added to the time delay difference; subtracting the absolute value of the hysteresis quantity from the time delay difference value when the data lags relative to the air interface; the system inherent delay of the AU downlink is obtained. And when the inherent time delay of the AU downlink system is calculated, taking the frame head of the 10ms NR wireless frame as the initial position, setting a counter, counting to the value accumulated by the counter at the initial position of the data at the cpri side, and multiplying the counted value by the unit time of the clock, namely the inherent time delay of the AU downlink system, which represents the time that the data is behind the frame head of the 10ms NR wireless frame.
The second step is specifically as follows: the frame head and the data of the 10ms NR wireless frame are transmitted in the optical fiber at the same time, namely the generated time delay is the same, the relative position is kept unchanged, and the speed of light propagation in vacuum is thatThe propagation speed of the optical signal in the optical fiber is slightly slower than the speed of light, since the propagation of the optical signal in the optical fiber is affected by the refractive index of the medium, the propagation speed is reduced by about 30%, according to>And (5) calculating to obtain each meter of optical fiber, wherein the transmission of the optical signal needs 5ns.
The third step is specifically as follows: the method comprises the steps of connecting an AU optical fiber loop, connecting a 10ms NR wireless frame head signal of the AU to a pin of a field programmable gate array FPGA, connecting a radio frequency line on hardware corresponding to the pin to a frequency spectrograph, using the radio frequency line as a rising edge detection signal trigger, connecting a signal from an antenna port of a transmitting end of the AU to a signal input port of the frequency spectrograph through the radio frequency line, measuring the system inherent delay of an uplink and a downlink of the AU through the frequency spectrograph, subtracting the system inherent delay value t_au_dl of the AU in the step I by the time delay value toffset displayed by the frequency spectrograph, and subtracting twice the optical fiber delay t_fiber in the step II to obtain the system inherent delay t_au_ul of the AU uplink. It should be noted that the fiber delay t_fiber calculated in step two is a single pass, and the AU is looped back, so that the fiber delay value needs to be doubled.
The fourth step is specifically as follows: since the uplink and downlink architectures of the AU system are not identical, from a hardware perspective, for example, there is a power amplifier device in the uplink transmitting direction and a low noise amplifier device in the downlink receiving direction; from a functional point of view, a peak clipping function and a nonlinear predistortion function need to be implemented in the uplink transmission direction. The inherent time delay of the uplink and downlink systems of the AU is different, the inherent time delay of the transmitting direction is generally larger than the inherent time delay of the receiving direction, and the uplink and downlink time delays of the systems are adjusted and aligned in order to keep the consistency of the uplink and downlink time delays of the systems.
The fifth step is specifically as follows: the AU and RU are directly connected by optical fibers, a frame header signal of a 10ms NR wireless frame of the RU is connected to a pin of an FPGA, a radio frequency line on hardware corresponding to the pin is connected to a frequency spectrograph and used as a rising edge detection signal trigger, a signal from an antenna port of a transmitting end of the RU is connected to a signal input port of the frequency spectrograph by the radio frequency line, the frequency spectrograph is used for measuring the inherent downlink delay of the system of the AU and the RU, a delay value toffset displayed by the frequency spectrograph is the inherent downlink delay of the AU plus the RU, meanwhile, the inherent downlink delay t_au_dl of the AU in the step I is subtracted by the value, and the inherent downlink delay t_ru_dl of the RU is obtained by subtracting the optical fiber delay t_fiber in the step II.
The sixth step is specifically as follows: the method comprises the steps of connecting a 10ms NR wireless frame head signal of an RU to a pin of an FPGA, connecting a radio frequency line on hardware corresponding to the pin to a spectrometer, using the signal from an antenna port of a transmitting end of the RU as a rising edge detection signal trigger, connecting the signal from the antenna port of the transmitting end of the RU to a signal input port of the spectrometer through the radio frequency line, measuring the uplink and downlink inherent time delay of the RU by the spectrometer, subtracting the downlink system inherent time delay value t_ru_dl of the RU in the step five, and subtracting twice the optical fiber time delay in the step two, thereby obtaining the uplink system inherent time delay t_ru_ul of the RU. It should be noted that the fiber delay t_fiber calculated in step two is a single pass, since RU is looped back, the fiber delay value needs to be doubled at this time.
The seventh step is specifically as follows: because the uplink and downlink architectures of the RU system are not identical, the RU system has a low-noise amplifier device in the uplink receiving direction and a power amplifier device in the downlink transmitting direction from the perspective of hardware; from a functional point of view, a peak clipping function and a nonlinear predistortion function need to be implemented in the downstream transmission direction. The inherent time delay of the uplink and downlink systems of the RUU is different, the inherent time delay in the transmitting direction is generally larger than the inherent time delay in the receiving direction, and the uplink and downlink time delays of the system are adjusted and aligned in order to keep the consistency of the uplink and downlink time delays of the system.
The method comprises the following steps: since in the system of AU and RU, if the air interface, 10ms NR radio frame and data are aligned when entering AU antenna port, the position relationship of 10ms NR radio frame header and data is that in the radio frequency link and digital link of AU, the data generates time delay, the position of frame header is unchanged, the data and frame header are transmitted together in optical fiber, the time delay is changed, but the relative position of the two is unchanged. In the radio frequency link and the digital link of the RU, the data generates a delay, and the position of the frame header is unchanged, so when the signal comes out from the antenna port of the RU, the 10ms nr radio frame header is delayed by an optical fiber delay relative to the air port, the data is delayed by the sum of the inherent delays of the systems of the AU and the RU and the optical fiber delay relative to the air port, and the data is delayed by the inherent delays of the systems of the 10ms nr radio frame header, the AU and the RU, and the inherent delays of the systems of the AU and the RU need to be delayed by the 10ms nr radio frame header. When data is transmitted in advance relative to an air interface, the frame head of a 10msNR wireless frame is required to delay the inherent delay value of the downlink systems of AU and RU, and the time length value of the advanced transmission is added; when data is transmitted in a delayed manner relative to an air interface, the frame head of a 10ms NR wireless frame is required to delay the system inherent delay value of the downlink of AU and RU, and the time length value of the advanced transmission is subtracted.
The step nine specifically comprises the following steps: because the mobile phone terminal UE signals in advance of 13.04us emission, in the time division duplex TDD mode, there is a possibility of overlapping between the end of the downlink signal and the beginning of the uplink signal, in the special time slot S time slot, the time length of the guard interval gap determines the optical fiber delay value and the inherent delay maximum value of the repeater system, and the condition to be satisfied is 13.04 us+optical fiber delay+inherent delay < the time length of gap of the repeater system, and when the condition is not satisfied, a high level is output to trigger an alarm prompting lamp.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the relation between 10msNR wireless frames and data, the inherent delay of the downlink of the receiving end of the near-end unit AU in the 5G repeater system is calculated firstly, then the system delay of the uplink of the AU transmitting end and the inherent delay of the uplink of the receiving end of the RU are calculated by adopting a spectrum analyzer in a mode of optical fiber loop AU, a mode of directly connecting the AU and the RU and a mode of optical fiber loop RU, and the accuracy of the calculation of the inherent delay of the system is improved;
2. the invention aligns the inherent time delay of the uplink and the downlink of the AU and the RU of the 5G repeater system, so that the uplink and the downlink of the system have symmetry;
3. aiming at the influence of long optical fibers on a system in a remote environment, the invention judges whether the end of downlink data and the beginning of uplink data in a protection interval GAP are overlapped or not, triggers a warning lamp to prompt risk, and increases the reliability of the system;
4. the invention fixes the inherent time delay of the uplink and downlink systems of the 5G repeater system, only needs to know the position relation of the frame header and the data of the 10ms NR wireless frame at the base station side, can adjust the time delay by itself, leads NR data to be aligned, and increases the time delay adjustment efficiency of the 5G repeater system.
Drawings
Fig. 1 is a flow chart of a delay self-adjusting method of the 5G repeater system of the present invention.
Fig. 2 is a timing diagram of a delay self-adjusting method of the 5G repeater system of the present invention.
Detailed Description
The following description of the embodiments of the present invention is made with reference to the accompanying drawings.
Referring to fig. 1 and 2, the present invention includes the steps of: a delay self-adjusting method of 5G repeater system calculates the system inherent delay of the AU uplink and downlink of the near end unit, then calculates the optical fiber delay of AU and RU, then calculates the system inherent delay of the RU uplink and downlink of the far end unit, then aligns the system inherent delay of the AU and RU uplink and downlink respectively, then frames the 10ms NR wireless frame, the delay value is the time length of the system downlink inherent delay. Finally, verifying whether the downlink data and the uplink data interfere with each other in the special time slot, and selecting whether to trigger the warning lamp according to the mutual interference, wherein the method specifically comprises the following steps:
step one, calculating the system inherent time delay t_au_dl of the AU downlink. Because the front end of the repeater is the RRU at the base station side, when the RRU transmits signals, the initial positions of the air interface and the 10ms NR wireless frame head are aligned, the position of the air interface is fixed in the data transmission process, namely, the situation that data is advanced or lagged relative to the air interface is possible, at the repeater side, the data enters from the antenna port of the AU, then, along with a data link, time delay is generated, the position of the 10ms NR wireless frame head is not changed, and the time delay difference between the 10ms NR wireless frame head and the initial position of the downlink data at the common public interface cpri side is counted. Because the data issued by the RRU at the base station side can be advanced or delayed relative to the air interface, when the data is advanced relative to the air interface, the absolute value of the advance is added to the time delay difference; subtracting the absolute value of the hysteresis quantity from the time delay difference value when the data lags relative to the air interface; the system inherent delay of the AU downlink is obtained. And when the inherent time delay of the AU downlink system is calculated, taking the frame head of the 10ms NR wireless frame as the initial position, setting a counter, counting to the value accumulated by the counter at the initial position of the data at the cpri side, and multiplying the counted value by the unit time of the clock, namely the inherent time delay of the AU downlink system, which represents the time that the data is behind the frame head of the 10ms NR wireless frame.
And step two, calculating the optical fiber time delay t_fiber between the AU and the RU. The frame head and the data of the 10ms NR wireless frame are transmitted in the optical fiber at the same time, namely the generated time delay is the same, the relative position is kept unchanged, and the speed of light propagation in vacuum is thatThe propagation speed of the optical signal in the optical fiber is slightly slower than the speed of light, since the propagation of the optical signal in the optical fiber is affected by the refractive index of the medium, the propagation speed is reduced by about 30%, according to>And (3) calculating to obtain each meter of optical fiber, wherein the optical signal transmission needs 5 nanoseconds ns, namely each kilometer of optical fiber, and the optical signal transmission needs 5 microseconds us.
And thirdly, calculating the system inherent delay t_au_ul of the AU uplink. The method comprises the steps of connecting an AU optical fiber loop, connecting a 10ms NR wireless frame head signal of the AU to a pin of an FPGA, connecting a radio frequency line on hardware corresponding to the pin to a frequency spectrograph, using the radio frequency line as a rising edge detection signal trigger, connecting a signal from an antenna port of a transmitting end of the AU to a signal input port of the frequency spectrograph, measuring the system inherent time delay of an uplink and a downlink of the AU through the frequency spectrograph, wherein a time delay value toffset displayed by the frequency spectrograph is the system inherent time delay of the uplink and the downlink of the AU, subtracting the value from the value by the system inherent time delay value t_au_dl of the downlink of the AU in the step one, and subtracting twice the optical fiber time delay t_fiber in the step two, thereby obtaining the system inherent time delay t_au_ul of the uplink of the AU. It should be noted that the fiber delay t_fiber calculated in step two is a single pass, and the AU is looped back, so that the fiber delay value needs to be doubled.
And step four, aligning the inherent time delay of the uplink and downlink systems of the AU. Since the uplink and downlink architectures of the AU system are not identical, from a hardware perspective, for example, there is a power amplifier device in the uplink transmitting direction and a low noise amplifier device in the downlink receiving direction; from a functional point of view, a peak clipping function and a nonlinear predistortion function need to be implemented in the uplink transmission direction. The inherent time delay of the uplink and downlink systems of the AU is different, the inherent time delay of the transmitting direction is generally larger than the inherent time delay of the receiving direction, and the uplink and downlink time delays of the systems are adjusted and aligned in order to keep the consistency of the uplink and downlink time delays of the systems.
And fifthly, calculating the system inherent delay t_ru_dl of the RU downlink. The AU and RU are directly connected by optical fibers, a frame header signal of a 10ms NR wireless frame of the RU is connected to a pin of an FPGA, a radio frequency line on hardware corresponding to the pin is connected to a frequency spectrograph and used as a rising edge detection signal trigger, a signal from an antenna port of a transmitting end of the RU is connected to a signal input port of the frequency spectrograph by the radio frequency line, the frequency spectrograph is used for measuring the inherent downlink delay of an AU-RU system, a delay value toffset displayed by the frequency spectrograph is the inherent downlink delay of the AU and the RU, the inherent downlink delay t_au_dl of the AU in the step I is subtracted by the value, and the inherent downlink delay t_ru_dl of the RU system is obtained by subtracting the optical fiber delay t_fiber in the step II.
And step six, calculating the system inherent delay t_ru_ul of the RU uplink. The method comprises the steps of connecting a 10ms NR wireless frame head signal of an RU to a pin of an FPGA, connecting a radio frequency line on hardware corresponding to the pin to a spectrometer, using the signal from an antenna port of a transmitting end of the RU as a rising edge detection signal trigger, connecting the signal from the antenna port of the transmitting end of the RU to a signal input port of the spectrometer through the radio frequency line, measuring the uplink and downlink inherent time delay of the RU by the spectrometer, subtracting the downlink system inherent time delay value t_ru_dl of the RU in the step five, and subtracting twice the optical fiber time delay in the step two, thereby obtaining the uplink system inherent time delay t_ru_ul of the RU. It should be noted that the fiber delay t_fiber calculated in step two is a single pass, since RU is looped back, the fiber delay value needs to be doubled at this time.
And step seven, aligning the system inherent time delay of the uplink and the downlink of the RU. Because the uplink and downlink architectures of the RU system are not identical, the RU system has a low-noise amplifier device in the uplink receiving direction and a power amplifier device in the downlink transmitting direction from the perspective of hardware; from a functional point of view, a peak clipping function and a nonlinear predistortion function need to be implemented in the downstream transmission direction. The inherent time delay of the uplink and downlink systems of the RUU is different, the inherent time delay in the transmitting direction is generally larger than the inherent time delay in the receiving direction, and the uplink and downlink time delays of the system are adjusted and aligned in order to keep the consistency of the uplink and downlink time delays of the system.
And step eight, in the RU, according to the position relation of the data relative to the air interface, adjusting the frame head of the 10msNR wireless frame to a position aligned with the initial position of the data. Since in the system of AU and RU, if the air interface, 10ms NR radio frame and data are aligned when entering AU antenna port, the position relationship of 10ms NR radio frame header and data is that in the radio frequency link and digital link of AU, the data generates time delay, the position of frame header is unchanged, the data and frame header are transmitted together in optical fiber, the time delay is changed, but the relative position of the two is unchanged. In the radio frequency link and the digital link of the RU, the data generates a delay, and the position of the frame header is unchanged, so when the signal comes out from the antenna port of the RU, the 10ms nr radio frame header is delayed by an optical fiber delay relative to the air port, the data is delayed by the sum of the inherent delays of the systems of the AU and the RU and the optical fiber delay relative to the air port, and the data is delayed by the inherent delays of the systems of the 10ms nr radio frame header, the AU and the RU, and the inherent delays of the systems of the AU and the RU need to be delayed by the 10ms nr radio frame header. When data is transmitted in advance relative to an air interface, the frame head of a 10msNR wireless frame is required to delay the inherent delay value of the downlink systems of AU and RU, and the time length value of the advanced transmission is added; when data is transmitted in a delayed manner relative to an air interface, the frame head of a 10ms NR wireless frame is required to delay the system inherent delay value of the downlink of AU and RU, and the time length value of the advanced transmission is subtracted.
Step nine, verifying whether the downlink data and the uplink data interfere with each other in the special time slot. In the case of short optical fiber, the mobile phone terminal UE signals and transmits in advance by 13.04us on an air interface, so that in the time division multiplexing TDD mode, the possibility of overlapping exists between the end of the downlink signal and the beginning of the uplink signal, and in the special time slot S time slot, the time length of the guard interval gap determines the optical fiber delay value and the inherent delay maximum value of the repeater system, and the condition to be satisfied is that 13.04 us+optical fiber delay+inherent delay < the time length of the gap of the repeater system, and when the condition is not established, a high level is output to trigger an alarm prompt lamp. In the case of long optical fibers, the UE needs to send out signals more in advance than the air interface, that is, means that the longer the optical fibers are, the larger the time delay brought is, and the more likely there is an overlapping phenomenon at the end of the downlink signal and the beginning of the uplink signal in the gap, and the condition that 13.04 us+optical fiber time delay+inherent time delay of the repeater system < the time length of the gap is satisfied, and when the condition is not satisfied, a high level is output, and an alarm prompt lamp is triggered.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.

Claims (9)

1. A time delay self-adjusting method of a 5G repeater system is characterized in that: the method comprises the following steps:
step one, calculating the system inherent time delay t_au_dl of an AU downlink;
step two, calculating the optical fiber time delay t_fiber between AU and RU;
step three, calculating the system inherent time delay t_au_ul of the AU uplink;
aligning the inherent time delay of the uplink and downlink systems of the AU;
step five, calculating the system inherent time delay t_ru_dl of the RU downlink;
step six, calculating the system inherent time delay t_ru_ul of the RU uplink;
aligning the system inherent time delay of the uplink and the downlink of the RU;
step eight, in the RU, according to the position relation of the data relative to the air interface, adjusting the frame head of the 10msNR wireless frame to a position aligned with the initial position of the data;
and step nine, verifying whether downlink data and uplink data interfere with each other in the special time slot, and selecting whether to trigger the warning lamp according to the mutual interference.
2. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the first step is specifically as follows: because the front end of the repeater is the remote unit RRU at the base station side, when the RRU transmits signals, the initial positions of the air interface and the 10ms NR wireless frame head are aligned, the position of the air interface is fixed in the data transmission process, namely, the situation that data is advanced or lagged relative to the air interface is possible, at the repeater side, the data enters from the antenna port of the AU, then, along with a data link, time delay is generated, the position of the 10ms NR wireless frame head is not changed, and the time delay difference between the 10ms NR wireless frame head and the initial position of the downlink data at the common public interface cpri side is counted; because the data issued by the RRU at the base station side can be advanced or delayed relative to the air interface, when the data is advanced relative to the air interface, the absolute value of the advance is added to the time delay difference; subtracting the absolute value of the hysteresis quantity from the time delay difference value when the data lags relative to the air interface; the system inherent delay of the AU downlink is obtained.
3. The delay self-adjusting method of a 5G repeater system according to claim 2, wherein: and when the inherent time delay of the AU downlink system is calculated, taking the frame head of the 10ms NR wireless frame as the initial position, setting a counter, counting to the value accumulated by the counter at the initial position of the data at the cpri side, and multiplying the counted value by the unit time of the clock, namely the inherent time delay of the AU downlink system, which represents the time that the data is behind the frame head of the 10ms NR wireless frame.
4. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the second step is specifically as follows: the frame head and the data of the 10ms NR wireless frame are transmitted in the optical fiber at the same time, namely the generated time delay is the same, the relative position is kept unchanged, and the speed of light propagation in vacuum is thatThe propagation speed of the optical signal in the optical fiber is slow relative to the speed of light, since the propagation of the optical signal in the optical fiber is affected by the refractive index of the medium, the propagation speed is reduced by less than 30%, according to +.>And (5) calculating to obtain each meter of optical fiber, wherein the transmission of the optical signal needs 5ns.
5. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the third step is specifically as follows: the method comprises the steps of connecting an AU optical fiber loop, connecting a 10ms NR wireless frame head signal of the AU to a pin of an FPGA, connecting a radio frequency line on hardware corresponding to the pin to a frequency spectrograph, using the radio frequency line as a rising edge detection signal trigger, connecting a signal from an antenna port of a transmitting end of the AU to a signal input port of the frequency spectrograph, measuring the system inherent time delay of an uplink and a downlink of the AU through the frequency spectrograph, wherein a time delay value toffset displayed by the frequency spectrograph is the system inherent time delay of the uplink and the downlink of the AU, subtracting the value from the value by the system inherent time delay value t_au_dl of the downlink of the AU in the step one, and subtracting twice the optical fiber time delay t_fiber in the step two, thereby obtaining the system inherent time delay t_au_ul of the uplink of the AU.
6. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the fifth step is specifically as follows: the AU and RU are directly connected by optical fibers, a frame header signal of a 10ms NR wireless frame of the RU is connected to a pin of an FPGA, a radio frequency line on hardware corresponding to the pin is connected to a frequency spectrograph and used as a rising edge detection signal trigger, a signal from an antenna port of a transmitting end of the RU is connected to a signal input port of the frequency spectrograph by the radio frequency line, the frequency spectrograph is used for measuring the inherent downlink delay of the system of the AU and the RU, a delay value toffset displayed by the frequency spectrograph is the inherent downlink delay of the AU plus the RU, meanwhile, the inherent downlink delay t_au_dl of the AU in the step I is subtracted by the value, and the inherent downlink delay t_ru_dl of the RU is obtained by subtracting the optical fiber delay t_fiber in the step II.
7. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the sixth step is specifically as follows: the method comprises the steps of connecting a 10ms NR wireless frame head signal of an RU to a pin of an FPGA, connecting a radio frequency line on hardware corresponding to the pin to a spectrometer, using the signal from an antenna port of a transmitting end of the RU as a rising edge detection signal trigger, connecting the signal from the antenna port of the transmitting end of the RU to a signal input port of the spectrometer through the radio frequency line, measuring the uplink and downlink inherent time delay of the RU by the spectrometer, subtracting the downlink system inherent time delay value t_ru_dl of the RU in the step five, and subtracting twice the optical fiber time delay in the step two, thereby obtaining the uplink system inherent time delay t_ru_ul of the RU.
8. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the method comprises the following steps: in the radio frequency link and the digital link of the RU, the data generates time delay, and the position of the frame head is unchanged, so when signals come out from an antenna port of the RU, the frame head of the 10ms NR wireless frame is delayed by optical fiber time delay relative to an air port, the data is delayed by the sum of the inherent time delay of the systems of the AU and the RU in the downlink and the optical fiber time delay relative to the air port, and the data is delayed by the inherent time delay of the systems of the 10ms NR wireless frame head, the inherent time delay of the systems of the AU and the RU in the downlink, and the 10ms NR wireless frame head needs to be delayed by the inherent time delay value of the systems of the AU and the RU in the downlink; when data is transmitted in advance relative to an air interface, the frame head of a 10ms NR wireless frame is delayed by the inherent delay value of the system of the downlink AU and RU, and the time length value of the advanced transmission is added; when data is transmitted with delay relative to the air interface, then the frame header of the 10ms nr radio frame needs to be delayed, and the system inherent delay value of the AU and RU downlink minus the time length value of the advanced transmission.
9. The delay self-adjusting method of a 5G repeater system according to claim 1, wherein: the step nine specifically comprises the following steps: because the mobile phone terminal UE signals in advance of 13.04us emission, in the time division duplex TDD mode, there is a possibility of overlapping between the end of the downlink signal and the beginning of the uplink signal, in the special time slot S time slot, the time length of the guard interval gap determines the optical fiber delay value and the inherent delay maximum value of the repeater system, and the condition to be satisfied is 13.04 us+optical fiber delay+inherent delay < the time length of gap of the repeater system, and when the condition is not satisfied, a high level is output to trigger an alarm prompting lamp.
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