CN103139817A - Method and device for diagnosing base station channel faults - Google Patents

Abstract

The invention discloses a method for diagnosing a channel failure of a base station, comprising: receiving a baseband signal sent by a baseband unit BBU, converting the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain a downlink signal power value; The downlink signal is transmitted, the transmit signal power value of the transmit channel is measured, and the forward signal power value of the downlink signal fed back to the detection channel is calculated; the transmit signal power value and the forward signal power value are respectively compared with the downlink The signal power value is calculated as a difference, and according to the obtained difference, it is judged whether the transmission channel and the detection channel are faulty. The invention also provides corresponding devices. The method for diagnosing the failure of the base station channel provided by the present invention can determine the fault link of the base station channel during the power detection, thereby determining the abnormal cause of the power detection, making the location of the power detection fault relatively simple, and reducing the operator's work work complexity.

Description

Method and device for diagnosing base station channel faults

technical field

The present invention relates to the field of wireless communication systems, in particular to a method and device for diagnosing base station channel faults.

Background technique

At present, in the TDD wireless communication system, a distributed base station including RRU (Radio Remote Unit, radio frequency remote unit) and BBU (Base Band Unit, base band unit) is used. The RRU array channels in the base station are generally divided into single-channel or multi-channel configurations, which are used for indoor coverage and outdoor macro stations respectively. RRU array channels include: high frequency or intermediate frequency transceivers, radio frequency amplifiers (power amplifiers and low noise amplifiers, etc.), feeder cables and outdoor units. For the base station in actual operation, it is required to periodically detect the transmitted power of each transmission channel, so as to monitor the accuracy of the output power of the channel, so as to ensure the performance and wireless indicators of the base station.

There are two commonly used methods for power detection of RRU array channels: one is to use the downlink signal power of the BBU as the detection power, and obtain the detected forward signal power of the detection channel, and compare the downlink signal power with the forward signal power The power is compared to determine whether the detection channel is faulty; the other is to use the spontaneous test data in the Gp time slot to detect the data power of the Gp time slot, and obtain the forward signal power of the corresponding time slot of the detection channel, and convert the forward signal The power is compared with the data power of the Gp time slot to determine whether the detection channel is faulty. However, when the power detected by the antenna port of the power detection is found to be abnormal, the meter can only measure the output power of the RRU antenna port, and cannot locate the problematic links inside the RRU transmission channel. Troubleshooting the faulty link in the power detection and determining the cause of the abnormal power detection will make the location of the power detection fault more complicated and increase the complexity of the work of the operator.

Contents of the invention

The main purpose of the present invention is to provide a method and device for diagnosing base station channel faults, which can determine the link where the base station channel fails during power detection, thereby determining the abnormal cause of power detection, making the location of power detection faults relatively simple, and The complexity of the work of the operator is reduced.

The present invention provides a method for diagnosing base station channel faults, including:

receiving a baseband signal sent by the baseband unit BBU, converting the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain a downlink signal power value;

Transmitting the downlink signal, measuring the transmit signal power value of the transmit channel, and calculating the forward signal power value of the downlink signal fed back to the detection channel;

Computing the difference between the transmit signal power value and the forward signal power value and the downlink signal power value respectively, and judging whether the transmit channel and the detection channel are faulty according to the obtained difference.

Preferably, after performing the conversion of the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain the power value of the downlink signal, it further includes:

The downlink signal power value is compared with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information to determine the accuracy of the downlink signal power value.

Preferably, the transmitting the downlink signal, measuring the transmission signal power value of the transmission channel, and calculating the forward signal power value of the downlink signal fed back to the detection channel includes:

Transmitting the downlink signal through the transmission channel and the external antenna port, and measuring it with a meter at the antenna port to obtain the power value of the transmitted signal;

After the downlink signal is fed back to the detection channel through switch control, the power value of the forward signal is calculated according to the saved parameters of the downlink signal.

Preferably, the calculation of the difference between the transmit signal power value and the forward signal power value and the downlink signal power value, and respectively judging whether the transmit channel and the detection channel are faulty according to the obtained difference specifically includes:

Calculate the difference between the transmitted signal power value and the downlink signal power value to obtain the actual gain of the transmission channel, and compare the actual gain of the transmission channel with the calibration gain of the transmission channel calculated according to the calibration parameters to determine the transmission channel whether there is a failure;

Calculate the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and compare the actual gain of the detection channel with the calibration gain of the detection channel calculated according to the calibration parameters, so as to judge the detection channel Whether the channel is faulty.

Preferably, before performing said transmitting the downlink signal, it also includes:

Select a channel in the downlink channel as the transmission channel, and select a time slot for transmitting the downlink signal.

The present invention also provides a device for diagnosing base station channel faults, including:

The receiving module is configured to receive a baseband signal sent by the baseband unit BBU, convert the baseband signal into a downlink signal, and perform power calculation on the downlink signal to obtain a downlink signal power value;

A transmitting module, configured to transmit the downlink signal, measure the transmit signal power value of the transmit channel, and calculate the forward signal power value of the downlink signal fed back to the detection channel;

The judging module is used to calculate the difference between the transmit signal power value and the forward signal power value and the downlink signal power value, and judge whether the transmit channel and the detection channel are faulty according to the obtained difference.

Preferably, the device for diagnosing base station channel faults also includes:

A comparing module, configured to compare the downlink signal power value with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information, so as to determine the accuracy of the downlink signal power value.

Preferably, the transmitting module includes:

A measurement unit, configured to transmit the downlink signal through the transmission channel and the external antenna port, and measure it with a meter at the antenna port to obtain the power value of the transmitted signal;

The calculation unit is used to calculate the power value of the forward signal according to the saved parameters of the downlink signal after the downlink signal is fed back to the detection channel through switch control.

Preferably, the judging module includes:

The first comparison unit is used to calculate the difference between the transmission signal power value and the downlink signal power value to obtain the actual gain of the transmission channel, and compare the actual gain of the transmission channel with the calibration gain of the transmission channel calculated according to the calibration parameters Make a comparison to determine whether the transmission channel is faulty;

The second comparison unit is used to calculate the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and calibrate the actual gain of the detection channel and the detection channel calculated according to the calibration parameters Gains are compared to determine whether the detection channel is faulty.

Preferably, the device for diagnosing base station channel faults also includes:

The selection module is used to select a channel in the downlink channel as a transmission channel, and select a time slot for transmitting the downlink signal.

The present invention converts the baseband signal sent by the baseband unit BBU into a downlink signal for the normal operation of the RRU, and uses the downlink signal as a detection signal to detect the power of the detection signal in the transmission channel and the detection channel, thereby performing RRU channel Diagnosis of faults. First, the downlink signal power value of the downlink signal is calculated, and then the downlink signal is transmitted through the downlink channel of the RRU, and the transmitted signal power value and the forward signal power value are obtained through measurement and calculation. The actual gain of the transmission channel and the actual gain of the detection channel are respectively obtained by the power value of the transmission signal and the power value of the forward signal, and are compared with the calibration gain of the RRU channel to determine whether the deviation between the actual gain of the channel and the calibration gain of the channel exceeds the preset threshold The limit value, so that it can be judged whether the transmission channel or the detection channel is faulty. By using this method, it is possible to determine the fault link of the base station channel during the power detection, thereby determining the abnormal cause of the power detection, making the location of the power detection fault relatively simple, and reducing the complexity of the work of the operator.

Description of drawings

FIG. 1 is a schematic flow diagram of an embodiment of a method for diagnosing base station channel faults in the present invention;

Fig. 2 is a schematic flow chart of launching in Fig. 1;

Fig. 3 is a schematic flow chart of judging in Fig. 1;

FIG. 4 is a schematic flow diagram of another embodiment of the method for diagnosing a channel failure of a base station according to the present invention;

FIG. 5 is a schematic flow chart of another embodiment of the method for diagnosing a base station channel fault according to the present invention;

FIG. 6 is a schematic structural diagram of an embodiment of a device for diagnosing base station channel faults according to the present invention;

Fig. 7 is a schematic structural diagram of the transmitting module in Fig. 6;

Fig. 8 is a schematic structural diagram of the judging module in Fig. 6;

FIG. 9 is a schematic structural diagram of another embodiment of the device for diagnosing channel failures of base stations according to the present invention;

FIG. 10 is a schematic structural diagram of yet another embodiment of the device for diagnosing channel faults of a base station according to the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The invention provides a method for diagnosing channel failure of a base station. In the distributed base station system, the baseband unit BBU is connected with the remote radio unit RRU, and the RRU receives the baseband signal sent by the BBU and converts it into a normal working downlink signal, and uses the downlink signal as a detection signal, and detects the detection signal The power in the transmission channel and detection channel is used to diagnose RRU channel faults. The provided RRU channel includes a control board, a channel transceiver, an output power detection channel, a power amplifier and a filter. The conversion of optical fiber and data, baseband-IF conversion (including up-conversion and down-conversion) and power calibration are controlled through the control board; the downlink signal is sent through the transmitter, so that the downlink signal passes through the transmission channel and passes through the power Amplifiers and filters are processed, and finally transmitted by the external antenna port; the receiver is used to receive the downlink signal fed back through the output power detection channel.

With reference to Fig. 1, propose an embodiment of the method for diagnosing base station channel failure of the present invention, this method comprises:

Step S101, receiving the baseband signal sent by the baseband unit BBU, converting the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain a downlink signal power value;

When the distributed base station is running in a commercial network, the baseband unit BBU is connected to the remote radio unit RRU, and the BBU sends the baseband signal to the RRU, and the RRU side converts the baseband signal into a normal working downlink signal and transmits the downlink signal transmitted to the client. In this embodiment, the downlink signal may be used as the detection signal to perform fault diagnosis of the RRU channel. After receiving the baseband signal sent by the BBU, it needs to be up-converted, that is, converted into a downlink signal. Then, by grabbing the data in the downlink signal in a certain time slot and calculating based on these data, you can The downlink signal power value of the downlink signal is obtained, and the downlink signal power value can be recorded as P_IQ_BB_Tx[n].

Step S102, transmit the downlink signal, measure the transmit signal power value of the transmission channel, and calculate the forward signal power value of the downlink signal fed back to the detection channel;

When the RRU converts the received baseband signal sent by the BBU into a downlink signal, and after calculating the downlink signal power value of the downlink signal, it can use the transmitter in the downlink channel of the RRU to transmit the received downlink signal To transmit and transmit the downlink signal through the external antenna port, at this time, it is necessary to measure the output power of the downlink signal when it is output to the transmission channel, and the measured power value is the transmit signal power value. At the same time, after the downlink signal is transmitted to the filter, the downlink signal can be fed back to the detection channel through the switch control, and the downlink signal is converted into a digital signal, and the control board receives the digital signal and calculates its corresponding power detection The power detection value is the forward signal power value of the downlink signal passing through the detection channel.

Step S103, calculating the difference between the power value of the transmit signal and the power value of the forward signal and the power value of the downlink signal, and judging whether the transmit channel and the detection channel are faulty according to the obtained difference.

After the transmit signal power value and the forward signal power value are obtained through measurement and calculation, the transmit signal power value and the forward signal power value are subtracted from the downlink signal power value respectively to obtain a difference, which is is the actual gain of the channel, that is, the actual gain of the transmission channel and the actual gain of the detection channel. Calculate according to the calibration parameters written in RRU channel production, the RRU channel calibration gain can be obtained, and then compare the channel actual gain with the channel calibration gain. At this time, a threshold value needs to be preset. When the difference between the actual gain of the channel and the calibrated gain of the channel exceeds the threshold value, it can be judged whether the transmission channel or the detection channel is faulty.

In the embodiment of the present invention, the baseband signal sent by the baseband unit BBU is converted into a downlink signal for RRU to work normally, and the downlink signal is used as a detection signal to detect the power of the detection signal in the transmission channel and the detection channel. Diagnose RRU channel faults. First, the downlink signal power value of the downlink signal is calculated, and then the downlink signal is transmitted through the downlink channel of the RRU, and the transmitted signal power value and the forward signal power value are obtained through measurement and calculation. The actual gain of the transmission channel and the actual gain of the detection channel are respectively obtained by the power value of the transmission signal and the power value of the forward signal, and are compared with the calibration gain of the RRU channel to determine whether the transmission channel or the detection channel is faulty. By using this method, it is possible to determine the fault link of the base station channel during the power detection, thereby determining the abnormal cause of the power detection, making the location of the power detection fault relatively simple, and reducing the complexity of the work of the operator.

Referring to FIG. 2, in an embodiment of the method for diagnosing base station channel faults in the present invention, step S102 further includes:

Step S1021, transmitting the downlink signal through the transmission channel and the external antenna port, and measuring with an instrument at the antenna port to obtain the power value of the transmitted signal;

After the RRU converts the received baseband signal sent by the BBU into a downlink signal, the downlink signal is used for the normal operation of the RRU, and then the downlink signal is transmitted through the downlink channel. At this time, the channel used to transmit the downlink signal is In the transmission channel, the downlink signal is processed by the power amplifier and filter in the transmission channel, and finally transmitted through the external antenna port. At this time, it is necessary to measure the output power of the downlink signal at the antenna port, which can be measured with a power measuring instrument, and the measured power value is the transmitted signal power value, which can be recorded as P_Ant_Pwr[n].

Step S1022, after the downlink signal is fed back to the detection channel through switch control, calculate the power value of the forward signal according to the saved parameters of the downlink signal.

When the downlink signal is transmitted to the filter in the transmission channel, the downlink signal can be controlled through the control switch connected to the filter, even if it is fed back to the detection channel, the downlink signal is received by the receiver in the detection channel, and then The downlink signal can be converted into a digital signal by performing frequency mixing, analog-to-digital conversion, and frequency down conversion on the downlink signal. Receive the digital signal through the control board, and calculate the power value corresponding to the digital signal according to the stored buffer data of the baseband signal. At this time, the obtained power value is the feedback of the downlink signal through the detection channel The subsequent forward signal power value can be recorded as P_IQ_Det_Tx[n].

Measure and calculate the output power of the downlink signal in the transmission channel and its detection power through the detection channel, that is, measure the power value of the transmitted signal at the antenna port through the instrument, and calculate its corresponding Forward signal power value, when it is necessary to perform power detection on the RRU, the corresponding detection can be carried out respectively through the transmitted signal power value and the forward signal power value, when an abnormality is detected in the transmitted signal power value or the forward signal power value , it can be determined that the corresponding transmission channel or detection channel is faulty. In this way, it can further ensure the determination of the link where the base station channel fails during power detection, and further reduce the complexity of the work of the operator.

In an RRU, multiple downlink channels may share one detection channel. For example, in an 8-channel RRU, usually the first four channels share the same detection channel, and the last four channels share one detection channel. In this case, after the open-loop calibration of the RRU machine is completed, the channel gains are all adjusted to the same downlink target gain. In this way, when the common detection channel fails, the detected corresponding four downlink channels The power of the forward signal will be inaccurate. According to the power of the forward signal of the four downlink channels, it can be judged whether the detection channel is faulty. When the configured power of the four downlink channels is the same, the forward signal power of each downlink channel is also basically the same. If the forward power of one of the downlink channels deviates too much from the forward signal power of the other three channels, it can be basically determined This downlink has failed.

Referring to FIG. 3, in an embodiment of the method for diagnosing base station channel faults in the present invention, step S103 further includes:

Step S1031: Calculate the difference between the transmit signal power value and the downlink signal power value to obtain the actual gain of the transmit channel, and compare the actual gain of the transmit channel with the calibration gain of the transmit channel calculated according to the calibration parameters to obtain Determine whether the transmission channel is faulty;

When the transmit signal power value P_Ant_Pwr[n] is detected by the power detection instrument at the antenna port, the actual gain of the transmit channel can be calculated, and the actual gain of the transmit channel can be recorded as G_Tx[n]. The calculation method is to calculate the transmit signal power value Subtract it from the downlink signal power value, that is, through the following formula: G_Tx[n]=P_Ant_Pwr[n]-P_IQ_BB_Tx[n]. After obtaining the actual gain G_Tx[n] of the transmitting channel through the formula, it is necessary to calculate the calibration gain of the channel according to the calibration parameters written in the production of the RRU channel, and then compare G_Tx[n] with the channel calibration gain to determine the difference between G_Tx[n] and Whether the difference of the channel calibration gain exceeds the preset threshold value, if so, it can be determined that the transmission channel is faulty.

Step S1032, calculating the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and comparing the actual gain of the detection channel with the calibration gain of the detection channel calculated according to the calibration parameters, To determine whether the detection channel is faulty.

After the forward signal power value P_IQ_Det_Tx[n] is calculated according to the buffered data of the baseband signal, the actual gain of the detection channel can be calculated, and the actual gain of the detection channel can be recorded as G_Det_Tx[n]. The calculation method is to convert the downlink The signal power value is subtracted from the forward signal power value, that is, through the following formula: G_Det_Tx[n]=P_IQ_Det_Tx[n]-P_Ant_Pwr[n]. After the actual gain G_Det_Tx[n] of the detection channel is obtained through the formula, compare G_Det_Tx[n] with the channel calibration gain to determine whether the difference between G_Det_Tx[n] and the channel calibration gain exceeds the preset threshold value. If it exceeds, Then it can be determined that the detection channel is faulty.

Calculate the difference between the transmitted signal power value obtained by measurement and the forward signal power value obtained by calculation and the downlink signal power value, so as to obtain the actual gain of the transmission channel and the actual gain of the detection channel, and then write it according to the RRU channel production The channel calibration gain calculated by the calibration parameters is compared with the obtained channel actual gain to determine whether the difference between the channel calibration gain and the channel actual gain exceeds the preset threshold value, so that it can be determined whether it is a transmitting channel or a detection channel. Channel has failed. In this way, the location of the power detection fault is further simplified, and the abnormal cause of the power detection can be determined conveniently.

With reference to Fig. 4, propose another embodiment of the method for diagnosing base station channel failure of the present invention, this method also includes:

Step S104, comparing the downlink signal power value with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information to determine the accuracy of the downlink signal power value.

When the RRU converts the received baseband signal sent by the BBU into a downlink signal, and calculates the downlink signal power value P_IQ_BB_Tx[n] according to the data in the captured downlink signal in a certain time slot, according to the configuration of the cell information, calculate the baseband power value of the baseband signal sent by the BBU, and compare the downlink signal power value with the baseband power value to determine whether the downlink signal power value is consistent with the baseband power value. If it is consistent, it means that the downlink signal power value obtained from the downlink signal is accurate, and the downlink signal can be transmitted; if it is not consistent, under normal circumstances, it can only explain the calculation method of the downlink signal power value and baseband power value It is different, and it cannot be used to judge that the power value of the downlink signal is inaccurate, that is to say, the downlink signal can also be transmitted.

After calculating the power of the downlink signal obtained by the up-conversion by the RRU to obtain the power value of the downlink signal, compare the power value of the downlink signal with the baseband power value of the baseband signal sent by the BBU calculated according to the configuration information of the cell to obtain Determine whether the downlink signal power value is accurate, and if so, transmit the downlink signal. In this way, to a large extent, the accuracy of the output power and detection power of the obtained downlink signal can be guaranteed, so that the success rate of channel fault detection is higher.

With reference to Fig. 5, propose another embodiment of the method for diagnosing base station channel failure of the present invention, this method also includes:

Step S105, selecting one of the downlink channels as a transmission channel, and selecting a time slot for transmitting the downlink signal.

When the RRU converts the baseband signal sent by the BBU into a downlink signal and needs to transmit the downlink signal through the downlink channel, one of the downlink channels of the RRU can be selected as the transmission channel. At the same time, it is also necessary to select the time slot for transmitting downlink signals. In this embodiment, you can choose the RRU main carrier TSO time slot or the downlink pilot time slot DWPTS. In other downlink time slots, due to uncertain business and power The output is not constant, therefore, it is not suitable as a time slot for power detection.

Select a downlink channel in the downlink channel of the RRU as the transmission channel of the downlink signal, and transmit the downlink signal; at the same time, select the TSO time slot of the RRU main carrier or the downlink pilot time slot DWPTS as the time slot for transmitting the downlink signal. The power detection of the downlink signal can be made clearer and simpler, and since the output power of the downlink signal of the selected time slot is relatively stable, the accuracy of the power detection of the detection signal is further ensured.

Referring to Fig. 6, an embodiment of the device for diagnosing base station channel faults of the present invention is proposed, the device includes:

The receiving module 10 is configured to receive a baseband signal sent by the baseband unit BBU, convert the baseband signal into a downlink signal, and perform power calculation on the downlink signal to obtain a downlink signal power value;

The transmitting module 20 is configured to transmit the downlink signal, measure the transmission signal power value of the transmission channel, and calculate the forward signal power value of the downlink signal fed back to the detection channel;

A judging module 30, configured to calculate the difference between the transmit signal power value and the forward signal power value and the downlink signal power value, and judge whether the transmit channel and the detection channel are faulty according to the obtained difference .

When the distributed base station is running in a commercial network, the baseband unit BBU is connected to the remote radio unit RRU, and the BBU sends the baseband signal to the RRU, and the RRU side converts the baseband signal into a normal working downlink signal and transmits the downlink signal transmitted to the client. In this embodiment, the downlink signal may be used as the detection signal to perform fault diagnosis of the RRU channel. When the receiving module 10 receives the baseband signal sent by the BBU, it needs to undergo up-conversion conversion, that is, convert it into a downlink signal, and then, by grabbing the data in the downlink signal in a certain time slot, and performing calculations based on these data , the downlink signal power value of the downlink signal can be obtained, and the downlink signal power value can be recorded as P_IQ_BB_Tx[n].

When the RRU converts the received baseband signal sent by the BBU into a downlink signal, and after calculating the downlink signal power value of the downlink signal, the transmitting module 20 can use the transmitter in the downlink channel of the RRU to transmit the received The downlink signal is transmitted, and the downlink signal is transmitted through the external antenna port. At this time, it is necessary to measure the output power of the downlink signal when it is output to the transmission channel, and the measured power value is the transmit signal power value. At the same time, after the downlink signal is transmitted to the filter, the downlink signal can be fed back to the detection channel through the switch control, and the downlink signal is converted into a digital signal, and the control board receives the digital signal and calculates its corresponding power detection The power detection value is the forward signal power value of the downlink signal passing through the detection channel.

After the transmit signal power value and the forward signal power value are obtained through measurement and calculation, the transmit signal power value and the forward signal power value are subtracted from the downlink signal power value respectively to obtain a difference, which is is the actual gain of the channel, that is, the actual gain of the transmission channel and the actual gain of the detection channel. Calculate according to the calibration parameters written in RRU channel production, the RRU channel calibration gain can be obtained, and then, the judgment module 30 compares the channel actual gain with the channel calibration gain. At this time, a threshold value needs to be preset. When the difference between the actual gain of the gain or detection channel and the calibrated gain of the channel exceeds the threshold value, it can be determined whether the transmission channel or the detection channel is faulty.

In the embodiment of the present invention, the baseband signal sent by the baseband unit BBU is converted into a downlink signal for RRU to work normally, and the downlink signal is used as a detection signal to detect the power of the detection signal in the transmission channel and the detection channel. Diagnose RRU channel faults. First, the downlink signal power value of the downlink signal is calculated, and then the downlink signal is transmitted through the downlink channel of the RRU, and the transmitted signal power value and the forward signal power value are obtained through measurement and calculation. The actual gain of the transmission channel and the actual gain of the detection channel are respectively obtained by the power value of the transmission signal and the power value of the forward signal, and are compared with the calibration gain of the RRU channel to determine whether the transmission channel or the detection channel is faulty. By using this method, it is possible to determine the fault link of the base station channel during the power detection, thereby determining the abnormal cause of the power detection, making the location of the power detection fault relatively simple, and reducing the complexity of the work of the operator.

Referring to FIG. 7, in an embodiment of the device for diagnosing base station channel faults in the present invention, the transmitting module 20 further includes:

The measurement unit 21 is used to transmit the downlink signal through the transmission channel and the external antenna port, and measure it with a meter at the antenna port to obtain the power value of the transmitted signal;

The calculation unit 22 is configured to calculate the power value of the forward signal according to the saved parameters of the downlink signal after the downlink signal is fed back to the detection channel through switch control.

After the RRU converts the received baseband signal sent by the BBU into a downlink signal, the downlink signal is used for the normal operation of the RRU, and then the downlink signal is transmitted through the downlink channel. At this time, the channel used to transmit the downlink signal is In the transmission channel, the downlink signal is processed by the power amplifier and filter in the transmission channel, and finally transmitted through the external antenna port. At this time, the measurement unit 21 needs to measure the output power of the downlink signal at the antenna port, which can be measured with a power measuring instrument, and the measured power value is the transmitted signal power value, which can be recorded as P_Ant_Pwr[n] .

When the downlink signal is transmitted to the filter in the transmission channel, the downlink signal can be controlled through the control switch connected to the filter, even if it is fed back to the detection channel, the downlink signal is received by the receiver in the detection channel, and then The downlink signal can be converted into a digital signal by performing frequency mixing, analog-to-digital conversion, and frequency down conversion on the downlink signal. The digital signal is received by the control board, and the calculation unit 22 calculates the power value corresponding to the digital signal according to the stored buffer data of the baseband signal. At this time, the obtained power value is the downlink signal passing detection The forward signal power value fed back by the channel may be recorded as P_IQ_Det_Tx[n].

Measure and calculate the output power of the downlink signal in the transmission channel and its detection power through the detection channel, that is, measure the power value of the transmitted signal at the antenna port through the instrument, and calculate its corresponding Forward signal power value, when it is necessary to perform power detection on the RRU, the corresponding detection can be carried out respectively through the transmitted signal power value and the forward signal power value, when an abnormality is detected in the transmitted signal power value or the forward signal power value , it can be determined that the corresponding transmission channel or detection channel is faulty. In this way, it can further ensure the determination of the link where the base station channel fails during power detection, and further reduce the complexity of the work of the operator.

In an RRU, multiple downlink channels may share one detection channel. For example, in an 8-channel RRU, usually the first four channels share the same detection channel, and the last four channels share one detection channel. In this case, after the open-loop calibration of the RRU machine is completed, the channel gains are all adjusted to the same downlink target gain. In this way, when the common detection channel fails, the detected corresponding four downlink channels The power of the forward signal will be inaccurate. According to the power of the forward signal of the 4 downlink channels, it can be judged whether the detection channel is faulty. When the configured power of the four downlink channels is the same, the forward signal power of each downlink channel is also basically the same. If the forward power of one of the downlink channels deviates too much from the forward signal power of the other three channels, it can be basically determined This downlink has failed.

Referring to Fig. 8, in an embodiment of the device for diagnosing base station channel faults in the present invention, the judging module 30 includes:

The first comparison unit 31 is configured to calculate the difference between the transmit signal power value and the downlink signal power value to obtain the actual gain of the transmit channel, and calibrate the actual gain of the transmit channel with the transmit channel calculated according to the calibration parameters Gain is compared to determine whether the transmission channel is faulty;

The second comparison unit 32 is configured to calculate the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and compare the actual gain of the detection channel with the detection channel calculated according to the calibration parameters The calibration gain is compared to determine whether the detection channel is faulty.

When the transmit signal power value P_Ant_Pwr[n] is detected by the power detection instrument at the antenna port, the actual gain of the transmit channel can be calculated, and the actual gain of the transmit channel can be recorded as G_Tx[n]. The calculation method is to calculate the transmit signal power value Subtract it from the downlink signal power value, that is, through the following formula: G_Tx[n]=P_Ant_Pwr[n]-P_IQ_BB_Tx[n]. After the actual gain G_Tx[n] of the transmission channel is obtained by the formula, the channel calibration gain must be calculated according to the calibration parameters written in the RRU channel production, and then the first comparison unit 31 compares G_Tx[n] with the channel calibration gain to judge Whether the difference between G_Tx[n] and the channel calibration gain exceeds the preset threshold value, if so, it can be determined that the transmission channel is faulty.

After the forward signal power value P_IQ_Det_Tx[n] is calculated according to the buffered data of the baseband signal, the actual gain of the detection channel can be calculated, and the actual gain of the detection channel can be recorded as G_Det_Tx[n]. The calculation method is to convert the downlink The signal power value is subtracted from the forward signal power value, that is, through the following formula: G_Det_Tx[n]=P_IQ_Det_Tx[n]-P_Ant_Pwr[n]. After the actual gain G_Det_Tx[n] of the detection channel is obtained by the formula, the second comparison unit 32 compares G_Det_Tx[n] with the channel calibration gain to determine whether the difference between G_Det_Tx[n] and the channel calibration gain exceeds the preset threshold If the value is exceeded, it can be determined that the detection channel is faulty.

Calculate the difference between the transmitted signal power value obtained by measurement and the forward signal power value obtained by calculation and the downlink signal power value, so as to obtain the actual gain of the transmission channel and the actual gain of the detection channel, and then write it according to the RRU channel production The channel calibration gain calculated by the calibration parameters is compared with the obtained channel actual gain to determine whether the difference between the channel calibration gain and the channel actual gain exceeds the preset threshold value, so that it can be determined whether it is a transmitting channel or a detection channel. Channel has failed. In this way, the location of the power detection fault is further simplified, and the abnormal cause of the power detection can be determined conveniently.

Referring to FIG. 9, another embodiment of the device for diagnosing base station channel faults according to the present invention is proposed. The device also includes:

The comparison module 40 is configured to compare the downlink signal power value with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information, so as to determine the accuracy of the downlink signal power value.

When the RRU converts the received baseband signal sent by the BBU into a downlink signal, and calculates the downlink signal power value P_IQ_BB_Tx[n] according to the data in the captured downlink signal in a certain time slot, according to the configuration of the cell information to calculate the baseband power value of the baseband signal sent by the BBU, and the comparison module 40 compares the downlink signal power value with the baseband power value to determine whether the downlink signal power value is consistent with the baseband power value. If it is consistent, it means that the downlink signal power value obtained from the downlink signal is accurate, and the downlink signal can be transmitted; if it is not consistent, under normal circumstances, it can only explain the calculation method of the downlink signal power value and baseband power value It is different, and it cannot be used to judge that the power value of the downlink signal is inaccurate, that is to say, the downlink signal can also be transmitted.

After calculating the power of the downlink signal obtained by the up-conversion by the RRU to obtain the power value of the downlink signal, compare the power value of the downlink signal with the baseband power value of the baseband signal sent by the BBU calculated according to the configuration information of the cell to obtain Determine whether the downlink signal power value is accurate, and if so, transmit the downlink signal. In this way, to a large extent, the accuracy of the output power and detection power of the obtained downlink signal can be guaranteed, so that the success rate of channel fault detection is higher.

Referring to FIG. 10 , another embodiment of the device for diagnosing base station channel faults according to the present invention is proposed. The device also includes:

The selection module 50 is configured to select one of the downlink channels as a transmission channel, and select a time slot for transmitting the downlink signal.

When the RRU converts the baseband signal sent by the BBU into a downlink signal and needs to transmit the downlink signal through the downlink channel, the selection module 50 can select one channel among the downlink channels of the RRU as the transmission channel. At the same time, it is also necessary to select the time slot for transmitting downlink signals. In this embodiment, you can choose the RRU main carrier TSO time slot or the downlink pilot time slot DWPTS. In other downlink time slots, due to uncertain business and power The output is not constant, therefore, it is not suitable as a time slot for power detection.

Select a downlink channel in the downlink channel of the RRU as the transmission channel of the downlink signal, and transmit the downlink signal; at the same time, select the TSO time slot of the RRU main carrier or the downlink pilot time slot DWPTS as the time slot for transmitting the downlink signal. The power detection of the downlink signal can be made clearer and simpler, and since the output power of the downlink signal of the selected time slot is relatively stable, the accuracy of the power detection of the detection signal is further ensured.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A method for diagnosing base station channel faults, characterized in that, comprising: receiving a baseband signal sent by the baseband unit BBU, converting the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain a downlink signal power value; Transmitting the downlink signal, measuring the transmit signal power value of the transmit channel, and calculating the forward signal power value of the downlink signal fed back to the detection channel; Computing the difference between the transmit signal power value and the forward signal power value and the downlink signal power value respectively, and judging whether the transmit channel and the detection channel are faulty according to the obtained difference. 2. The method according to claim 1, wherein, after performing the conversion of the baseband signal into a downlink signal, and performing power calculation on the downlink signal to obtain the downlink signal power value, further comprising: The downlink signal power value is compared with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information to determine the accuracy of the downlink signal power value. 3. The method according to claim 1 or 2, wherein the downlink signal is transmitted, the transmit signal power value of the transmit channel is measured, and the forward signal power value of the downlink signal fed back to the detection channel is calculated include: Transmitting the downlink signal through the transmission channel and the external antenna port, and measuring it with a meter at the antenna port to obtain the power value of the transmitted signal; After the downlink signal is fed back to the detection channel through switch control, the power value of the forward signal is calculated according to the saved parameters of the downlink signal. 4. The method according to claim 3, wherein the difference between the transmitted signal power value and the forward signal power value and the downlink signal power value is calculated respectively, and the obtained difference is judged respectively. Whether there is a fault in the above-mentioned transmission channel and detection channel specifically includes: Calculate the difference between the transmitted signal power value and the downlink signal power value to obtain the actual gain of the transmission channel, and compare the actual gain of the transmission channel with the calibration gain of the transmission channel calculated according to the calibration parameters to determine the transmission channel whether there is a failure; Calculate the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and compare the actual gain of the detection channel with the calibration gain of the detection channel calculated according to the calibration parameters, so as to judge the detection channel Whether the channel is faulty. 5. The method according to claim 1, further comprising: before performing said transmitting the downlink signal: Select a channel in the downlink channel as the transmission channel, and select a time slot for transmitting the downlink signal. 6. A device for diagnosing base station channel faults, characterized in that it comprises: The receiving module is configured to receive a baseband signal sent by the baseband unit BBU, convert the baseband signal into a downlink signal, and perform power calculation on the downlink signal to obtain a downlink signal power value; A transmitting module, configured to transmit the downlink signal, measure the transmit signal power value of the transmit channel, and calculate the forward signal power value of the downlink signal fed back to the detection channel; The judging module is used to calculate the difference between the transmit signal power value and the forward signal power value and the downlink signal power value, and judge whether the transmit channel and the detection channel are faulty according to the obtained difference. 7. The device of claim 6, further comprising: A comparing module, configured to compare the downlink signal power value with the baseband power value of the baseband signal sent by the BBU calculated according to the cell configuration information, so as to determine the accuracy of the downlink signal power value. 8. The device according to claim 6 or 7, wherein the transmitting module comprises: A measurement unit, configured to transmit the downlink signal through the transmission channel and the external antenna port, and measure it with a meter at the antenna port to obtain the power value of the transmitted signal; The calculation unit is used to calculate and obtain the power value of the forward signal according to the saved parameters of the downlink signal after the downlink signal is fed back to the detection channel through switch control. 9. The device according to claim 8, wherein the judging module comprises: The first comparison unit is used to calculate the difference between the transmit signal power value and the downlink signal power value to obtain the actual gain of the transmit channel, and compare the actual gain of the transmit channel with the calibration gain of the transmit channel calculated according to the calibration parameters Compare to determine whether the transmission channel is faulty; The second comparison unit is used to calculate the difference between the forward signal power value and the downlink signal power value to obtain the actual gain of the detection channel, and calibrate the actual gain of the detection channel with the detection channel calculated according to the calibration parameters Gains are compared to determine whether the detection channel is faulty. 10. The apparatus of claim 6, further comprising: The selection module is used to select a channel in the downlink channel as a transmission channel, and select a time slot for transmitting the downlink signal.

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