CN106912069B - Distributed antenna system remote terminal and uplink signal link detection method and device thereof - Google Patents
Distributed antenna system remote terminal and uplink signal link detection method and device thereof Download PDFInfo
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- CN106912069B CN106912069B CN201710182906.3A CN201710182906A CN106912069B CN 106912069 B CN106912069 B CN 106912069B CN 201710182906 A CN201710182906 A CN 201710182906A CN 106912069 B CN106912069 B CN 106912069B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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Abstract
the invention relates to a distributed antenna system remote terminal and an uplink signal link detection method and device thereof. The remote machine of the distributed antenna system comprises an uplink radio frequency module, a digital board and a radio frequency switch unit, wherein the digital board comprises an embedded host and a digital processing unit; when the embedded host receives the uplink signal link detection instruction, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended; the digital processing unit transmits a configured first test signal from a transmitting port of the digital board and receives a second test signal from a receiving port of the digital board; and the embedded host judges whether the uplink signal link has a fault according to the first test signal and the second test signal. The invention can find the uplink signal link abnormality of the equipment in time.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a distributed antenna system remote terminal, a method for detecting an uplink signal of a distributed antenna system remote terminal, and an apparatus for detecting an uplink signal of a distributed antenna system remote terminal.
Background
Active DAS (distributed antenna system) devices are mainly used for wireless coverage, and are widely used in access and coverage of indoor wireless cells. Active DAS devices are used as an infrastructure for indoor signal distribution and need to operate stably and reliably for a long period of time. At present, fault detection and reporting of most of equipment mainly concentrate on detection and judgment of current and voltage of hardware, the method can only detect main devices, cannot find the influence of software running abnormity on a link, and cannot reflect the hardware working state of the whole link. In order to make up for the deficiency, some devices adopt a signal gain detection mode to determine the operation state of the downlink signal link of the device, but for the uplink signal link, the signal link and the downlink signal link are reverse, and the abnormality is usually known through manual daily tests or customer complaints and complaints, which brings more troubles to the operation and maintenance of the device.
Disclosure of Invention
Therefore, it is necessary to provide a distributed antenna system remote terminal, and a method and an apparatus for detecting an uplink signal link thereof, which can find out an uplink signal link abnormality of a device in time, and provide greater convenience for maintenance and repair.
A distributed antenna system remote terminal comprises an uplink radio frequency module, a digital board and a radio frequency switch unit, wherein the digital board comprises an embedded host and a digital processing unit; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
when the embedded host receives the uplink signal link detection instruction, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended;
The digital processing unit transmits a configured first test signal from a transmitting port of the digital board and receives a second test signal from a receiving port of the digital board, wherein the frequency of the first test signal is the frequency in an operating band of an uplink signal link of a remote machine of the distributed antenna system;
And the embedded host judges whether the uplink signal link has a fault according to the first test signal and the second test signal.
A method for detecting uplink signal link of remote machine in distributed antenna system includes steps:
When an uplink signal link detection instruction is received, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
Acquiring a first test signal transmitted through a transmitting port of a digital board, wherein the frequency of the first test signal is the frequency in a working band of an uplink signal link of a remote terminal of a distributed antenna system, and the first test signal is a signal transmitted by a digital processing unit;
Acquiring a second test signal received by the digital processing unit from a receiving port of a digital board, wherein the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
and judging whether the uplink signal link has a fault according to the first test signal and the second test signal.
a distributed antenna system remote-end uplink signal detection device, comprising:
The control module is used for conducting the input end of the uplink radio frequency module with the transmitting port of the digital board by controlling the radio frequency switch unit and suspending the normal link signal processing function of the digital processing unit in the digital board when receiving the uplink signal link detection instruction; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
the digital processing unit is used for receiving a first test signal transmitted by a transmission port of a digital board, wherein the frequency of the first test signal is the frequency in a working band of an uplink signal link of a remote terminal of a distributed antenna system, and the first test signal is a signal transmitted by the digital processing unit;
a second test signal obtaining module, configured to obtain a second test signal received by the digital processing unit from a receiving port of a digital board, where the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
And the fault detection module is used for judging whether the uplink signal link has faults or not according to the first test signal and the second test signal.
according to the distributed antenna system remote machine and the uplink signal link detection method and device thereof, according to the characteristics of the active digital DAS remote machine, the radio frequency switch unit is additionally arranged in the DAS remote machine, when the uplink signal link detection is required, the embedded host machine realizes the connection of the uplink radio frequency module and the transmitting port of the digital board by controlling the radio frequency switch unit, the digital processing unit transmits a configured test signal from the transmitting port of the digital board, the test signal is input into the receiving port of the digital board through the uplink radio frequency module, and the embedded host machine can timely find the uplink signal link abnormality of the equipment according to the test signal output and input by the digital board, so that greater convenience is provided for maintenance and overhaul. In addition, the invention can detect the uplink signal link of the equipment at any time only by adding a radio frequency switch unit and matching with corresponding software design, so that the diagnostic capability of the equipment is more convenient and effective, the hardware change is smaller, and the deployment is convenient; the digital board directly outputs stable and effective reference signals, the link test function can be operated at any time according to the requirements of the equipment control end without the help of external reference signals, and the investment of personnel and resources for engineering uplink signal link test is saved.
Drawings
FIG. 1 is a schematic diagram of a DAS remote according to the prior art;
FIG. 2 is a schematic view of a DAS remote according to an embodiment of the present invention;
FIG. 3 is a schematic view of a DAS distal machine according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a DAS remote according to one embodiment of the present invention;
Fig. 5 is a flowchart illustrating a method for detecting uplink signals of remote units in a distributed antenna system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the connection of the switch unit in the test mode according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the connection of the switch unit in the normal operating mode according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of an apparatus for detecting an uplink signal of a remote unit in a distributed antenna system according to an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, a brief description of the structure and operation of a prior art DAS distal machine will be provided.
as shown in fig. 1, the DAS remote includes a digital board, a downlink rf module, an uplink rf module, and a duplexer, where the digital board includes an embedded host and a digital processing unit. When the DAS remote machine is in a normal working state, downlink signals of the DAS remote machine reach a downlink radio frequency module from a TX port (transmitting port) of a digital board and then enter a duplexer; the uplink signal of the DAS remote enters the uplink rf module through the duplexer, and then enters the RX port (receive port) of the digital board.
When detecting a downlink signal link, the operating state of the device downlink signal link is generally determined by a spontaneous information source of a digital board and power detection of the output end of the device downlink signal link. But for the uplink signal link, which is the reverse of the downlink signal link, it is difficult to detect because the coverage area does not have a stable and effective reference source. The invention provides a scheme capable of detecting the uplink signal link of the DAS remote machine at any time according to the characteristics of the active digital DAS remote machine, so that the diagnostic capability of the equipment is more convenient and effective, the link abnormality of the equipment is timely found, and the convenience is provided for maintenance and overhaul.
in order to further explain the technical means and effects of the present invention, the following description of the present invention with reference to the accompanying drawings and preferred embodiments will be made for clarity and completeness.
As shown in fig. 2, a distributed antenna system remote machine includes an uplink radio frequency module, a digital board and a radio frequency switch unit, where the digital board includes an embedded host and a digital processing unit; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
when the embedded host receives the uplink signal link detection instruction, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended;
the digital processing unit transmits a configured first test signal from a transmitting port of the digital board and receives a second test signal from a receiving port of the digital board, wherein the frequency of the first test signal is the frequency in an operating band of an uplink signal link of a remote machine of the distributed antenna system;
and the embedded host judges whether the uplink signal link has a fault according to the first test signal and the second test signal.
the remote machine of the distributed antenna system realizes the detection of the uplink signal link of the DAS remote machine at any time by additionally arranging the radio frequency switch unit in the DAS remote machine and matching with corresponding software design.
The hardware structure of the DAS remote improved by the present invention is briefly described below.
A radio frequency switch unit is arranged in the DAS remote machine and comprises radio frequency switches. The radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and can realize the test of an uplink signal link. In addition, in order not to affect the normal use of the DAS remote, in one embodiment, as shown in fig. 3, the distributed antenna system remote further includes a downlink rf module and a duplexer; the input end of the downlink radio frequency module is connected with the radio frequency switch unit, the output end of the downlink radio frequency module is connected with the input end of the duplexer, the output end of the duplexer is connected with the radio frequency switch unit, and the embedded host machine can enable the DAS remote machine to normally work by controlling the radio frequency switch unit.
the number and type of the radio frequency switches included in the radio frequency switch unit can be determined according to actual needs. For example, in one embodiment, as shown in fig. 4, the rf switch unit includes a first rf switch S1 and a second rf switch S2; the movable end 1 of the first radio frequency switch S1 is connected with a transmitting port TX of the digital board, the first immovable end 2 of the first radio frequency switch S1 is connected with an input end of the downlink radio frequency module, the second immovable end 3 of the first radio frequency switch S1 is connected with the first immovable end 2 of the second radio frequency switch S2, the movable end 1 of the second radio frequency switch S2 is connected with an input end of the uplink radio frequency module, and the second immovable end 3 of the second radio frequency switch S2 is connected with an output end of the duplexer.
In combination with the above structure of the DAS remote machine, the present invention also makes software improvements, and the functions of each device will be described in detail below.
When the DAS remote machine enters a test mode, namely the embedded host machine receives an uplink signal link detection instruction, the radio frequency switch unit is controlled to conduct the input end of the uplink radio frequency module with the transmitting port of the digital board. In addition, in one embodiment, when the embedded host receives a normal operating instruction of the remote terminal of the distributed antenna system, the embedded host conducts the transmitting port of the digital board with the input end of the downlink radio frequency module and conducts the input end of the uplink radio frequency module with the output end of the duplexer by controlling the radio frequency switch unit.
Since the digital processing unit is required to transmit the test signal, the embedded host needs to suspend the normal link signal processing function of the digital processing unit, wherein suspending the normal link signal processing function of the digital processing unit can be implemented according to the manner known in the art. In addition, since the present invention implements the detection of the uplink signal, the embedded host needs to configure the frequency of the test signal transmitted by the digital processing unit signal. The frequency of the configured test signal only needs to be the frequency in the operating band of the uplink signal link, and the specific value can be set according to actual needs.
because the invention adopts the power detection method to realize the detection of the uplink signal link, the embedded host also needs to configure the power of the test signal, and the power of the test signal is not strictly limited and can be set according to the actual requirement. After configuring the test signal, the digital processing unit transmits the test signal from the TX port of the digital board and receives the test signal from the RX port of the digital board.
In one embodiment, the embedded host compares the difference between the power of the second test signal and the power of the first test signal with a preset uplink gain; and when the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
The invention also provides a method for detecting the uplink signal of the remote terminal of the distributed antenna system, which is described in detail below with reference to the accompanying drawings.
As shown in fig. 5, a method for detecting uplink signals of a remote unit in a distributed antenna system includes the steps of:
s110, when receiving an uplink signal link detection instruction, conducting the input end of the uplink radio frequency module and the transmitting port of the digital board by controlling the radio frequency switch unit, and suspending the normal link signal processing function of the digital processing unit in the digital board; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
s120, acquiring a first test signal transmitted through a transmitting port of a digital board, wherein the frequency of the first test signal is the frequency in a working band of an uplink signal link of a remote terminal of the distributed antenna system, and the first test signal is a signal transmitted by the digital processing unit;
s130, acquiring a second test signal received by the digital processing unit from a receiving port of the digital board, wherein the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
And S140, judging whether the uplink signal link has a fault according to the first test signal and the second test signal.
the method for detecting the uplink signal link fault of the remote terminal of the distributed antenna system can be realized through a corresponding program, and the program can run in an embedded host of a digital board. By adding a radio frequency switch unit in the DAS remote machine and matching with corresponding software design, the method realizes the detection of the uplink signal link of the DAS remote machine at any time.
The hardware structure of the DAS remote improved by the present invention is briefly described below.
A radio frequency switch unit is arranged in the DAS remote machine and comprises radio frequency switches. The radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module. The radio frequency switch unit is connected with the digital board through a control line, and the embedded host of the digital board can control the conduction state of the radio frequency switch unit to realize uplink signal link fault detection.
In addition, in order not to affect the normal use of the DAS remote, as shown in fig. 3, the distributed antenna system remote further includes a downlink rf module and a duplexer; the input end of the downlink radio frequency module is connected with the radio frequency switch unit, the output end of the downlink radio frequency module is connected with the input end of the duplexer, the output end of the duplexer is connected with the radio frequency switch unit, and the embedded host machine can enable the DAS remote machine to normally work by controlling the radio frequency switch unit.
The number and type of the radio frequency switches included in the radio frequency switch unit can be determined according to actual needs. For example, the rf switch unit includes two 1 × 2 rf switches, and the 1 × 2 rf switch has a moving end and two fixed ends. The rf switch unit may also comprise only one rf switch if only the uplink signal detection function is implemented. The rf switch unit may include a plurality of rf switches, e.g., three, etc., if cost is not a concern. The rf switch is not limited to the 1 x 2 rf switch, and may be a rf switch with more ports.
In one embodiment, as shown in fig. 4, the rf switch unit includes a first rf switch S1 and a second rf switch S2; the movable end 1 of the first radio frequency switch S1 is connected with a transmitting port TX of the digital board, the first immovable end 2 of the first radio frequency switch S1 is connected with an input end of the downlink radio frequency module, the second immovable end 3 of the first radio frequency switch S1 is connected with the first immovable end 2 of the second radio frequency switch S2, the movable end 1 of the second radio frequency switch S2 is connected with an input end of the uplink radio frequency module, and the second immovable end 3 of the second radio frequency switch S2 is connected with an output end of the duplexer.
In conjunction with the above-described structure of the DAS remote machine, the present invention also provides software improvements, and the following steps are described in detail.
in step S110, the DAS remote machine may be set to two operating modes, one being a normal operating mode and the other being a test mode. The normal working mode means that the switch conducting relation of the switch switching unit maintains the conventional connection relation of the digital board, the downlink radio frequency module and the uplink receiving module, so that the signal trend of the equipment is the same as that of the traditional digital DAS. The test mode refers to that the switch conducting relation of the switch switching unit keeps the uplink radio frequency module and the digital board in a loop connection mode, and the detection of an uplink signal link is realized. Through the setting of two kinds of mode, the user can be according to the requirement of equipment control end at any time operation uplink test function and the normal work function of DAS remote-end machine.
When the DAS remote machine enters a test mode, namely an uplink signal link detection instruction is received, the embedded host controls the radio frequency switch unit to conduct the input end of the uplink radio frequency module with the transmitting port of the digital board. As shown in fig. 6, the embedded host in the digital board controls the rf switch unit to set the switches S1 to be turned on by 1 and 3, and set the switches S2 to be turned on by 1 and 2, so that the input terminal of the uplink rf module is turned on with the transmit port of the digital board, and the output terminal of the uplink rf module is turned on with the receive port of the digital board.
In one embodiment, the distributed antenna system remote-end uplink signal detection method may further include the steps of: when a normal working instruction of the remote machine of the distributed antenna system is received, the transmitting port of the digital board is conducted with the input end of the downlink radio frequency module through controlling the radio frequency switch unit, the input end of the uplink radio frequency module is conducted with the output end of the duplexer, the digital board, the downlink radio frequency module and the uplink radio frequency module are in a conventional connection state, and the DAS remote machine works normally.
as shown in fig. 7, when the device is in the normal operation mode, the on state of the switch is: and S1 is conducted with 1 and 2, S2 is conducted with 1 and 3, downlink signals of DAS remote equipment reach a downlink radio frequency module from a digital board and then enter a duplexer, and uplink signals enter an uplink radio frequency module through the duplexer and then enter the digital board, which has the same principle as the conventional digital DAS.
since the digital processing unit is required to transmit the test signal, the embedded host of the digital board needs to suspend the normal link signal processing function of the digital processing unit, wherein suspending the normal link signal processing function of the digital processing unit can be implemented according to the existing manner in the prior art.
In step S120 and step S130, since the present invention implements the detection of the uplink signal, the embedded host needs to configure the frequency of the test signal transmitted by the digital processing unit. The frequency of the configured test signal only needs to be the frequency in the operating band of the uplink signal link, and the specific value can be set according to actual needs. For example, the operating band of the uplink signal link of the device is 1920MHz (megahertz) -1980MHz, and the frequency of the test signal may be set to any value within 1920MHz-1980MHz, such as 1950MHz, etc.
The invention adopts the power detection method to realize the detection of the uplink signal link, so the power of the test signal is required to be configured, the power of the test signal is not strictly limited, and the power can be set according to the actual requirement. The first test signal obtained by the embedded host is the test signal configured by the embedded host.
After the embedded host computer is configured with the test signal, the digital processing unit transmits the test signal configured with the embedded host computer from the TX port, the test signal enters the RX port of the digital board through the uplink radio frequency module, the digital processing unit of the digital board obtains the test signal received by the RX port of the digital board, and the embedded host computer obtains the received test signal from the digital processing unit.
In step S140, the embedded host determines whether there is a failure in the uplink signal link according to the test signal output by the digital board and the received test signal. In one embodiment, the step of determining whether the uplink signal link has a failure according to the first test signal and the second test signal may include: comparing the difference value of the power of the second test signal and the power of the first test signal with a preset uplink gain; and if the difference value of the difference value and the uplink gain is within a preset tolerance range, determining that the uplink signal link is normal, otherwise, determining that the uplink signal link is abnormal.
For example, the power of the test signal output by the digital board is P0, the frequency point is F0, where F0 is the frequency in the operating band of the device uplink, and the power of the test signal received by the digital board RX port counted by the digital processing unit is P1, the embedded host compares the values of P1-P0 with the uplink gain value G1 prestored in the system, if the difference is within the tolerance range (e.g., within 2 dB), the device uplink is considered to be normal, and an uplink normal result is returned, otherwise, an uplink abnormal result is returned.
based on the same inventive concept, the invention also provides a device for detecting the uplink signal of the remote terminal of the distributed antenna system, and the following describes the specific implementation mode of the device in detail with reference to the attached drawings.
As shown in fig. 8, a remote unit uplink signal link detection device of a distributed antenna system includes:
The control module 110 is configured to, when receiving the uplink signal link detection instruction, turn on an input end of the uplink radio frequency module and a transmission port of the digitizer by controlling the radio frequency switch unit, and suspend a normal link signal processing function of the digital processing unit in the digitizer; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
a first test signal obtaining module 120, configured to obtain a first test signal transmitted through a transmission port of a digital board, where a frequency of the first test signal is an in-band frequency of an uplink signal link of a remote terminal of a distributed antenna system, and the first test signal is a signal transmitted by the digital processing unit;
A second test signal obtaining module 130, configured to obtain a second test signal received by the digital processing unit from a receiving port of the digital board, where the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
and a failure detection module 140, configured to determine whether the uplink signal link has a failure according to the first test signal and the second test signal.
The device for detecting the uplink signal link fault of the remote terminal of the distributed antenna system can operate in an embedded host of a digital board. By additionally arranging a radio frequency switch unit in the DAS remote machine and matching with corresponding software design, the device realizes the detection of the uplink signal link of the DAS remote machine at any time.
The hardware structure of the DAS remote improved by the present invention is briefly described below.
a radio frequency switch unit is arranged in the DAS remote machine and comprises radio frequency switches. The radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module. The radio frequency switch unit is connected with the digital board through a control line, and the embedded host of the digital board can control the conduction state of the radio frequency switch unit to realize uplink signal link fault detection.
in addition, in order not to affect the normal use of the DAS remote, as shown in fig. 3, the distributed antenna system remote further includes a downlink rf module and a duplexer; the input end of the downlink radio frequency module is connected with the radio frequency switch unit, the output end of the downlink radio frequency module is connected with the input end of the duplexer, the output end of the duplexer is connected with the radio frequency switch unit, and the embedded host of the digital board can enable the DAS remote machine to normally work by controlling the radio frequency switch unit.
The number and type of the radio frequency switches included in the radio frequency switch unit can be determined according to actual needs. For example, in one embodiment, as shown in fig. 4, the rf switch unit includes a first rf switch S1 and a second rf switch S2; the movable end 1 of the first radio frequency switch S1 is connected with a transmitting port TX of the digital board, the first immovable end 2 of the first radio frequency switch S1 is connected with an input end of the downlink radio frequency module, the second immovable end 3 of the first radio frequency switch S1 is connected with the first immovable end 2 of the second radio frequency switch S2, the movable end 1 of the second radio frequency switch S2 is connected with an input end of the uplink radio frequency module, and the second immovable end 3 of the second radio frequency switch S2 is connected with an output end of the duplexer.
In conjunction with the above-described structure of the DAS remote machine, the present invention also provides software improvements, and the functions of the various modules are described in detail below.
When the DAS remote enters the test mode, that is, when the control module 110 receives the uplink signal link detection command, the radio frequency switch unit is controlled to connect the input terminal of the uplink radio frequency module to the transmission port of the digital board. In addition, in an embodiment, when the control module 110 receives a normal operating instruction of the remote terminal of the distributed antenna system, the control radio frequency switch unit is controlled to connect the transmitting port of the digital board to the input terminal of the downlink radio frequency module, and connect the input terminal of the uplink radio frequency module to the output terminal of the duplexer.
Since the digital processing unit is required to transmit the test signal, the control module 110 is required to suspend the normal link signal processing function of the digital processing unit, wherein the suspension of the normal link signal processing function of the digital processing unit can be implemented according to the manner known in the art.
Since the invention implements the detection of the uplink signal link, the embedded host needs to configure the frequency of the test signal transmitted by the signal of the digital processing unit. The frequency of the configured test signal only needs to be the frequency in the operating band of the uplink signal link, and the specific value can be set according to actual needs.
Because the invention adopts the power detection method to realize the detection of the uplink signal link, the embedded host also needs to configure the power of the test signal, and the power of the test signal is not strictly limited and can be set according to the actual requirement. The first test signal acquired by the first test signal acquiring module 120 is a test signal configured by the embedded host.
after configuring the test signal, the digital processing unit transmits the test signal from the TX port of the digital board, receives the test signal from the RX port of the digital board, and the second test signal obtaining module 130 obtains the test signal from the digital processing unit.
In one embodiment, the fault detection module 140 compares the difference between the power of the second test signal and the power of the first test signal to a preset upstream gain; and when the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
for a better understanding of the present invention, reference will now be made in detail to several specific embodiments.
the frequency bands of the digital DAS remote machine are 2110MHz-2170MHz at the downlink and 1920MHz-1980MHz at the uplink.
When the device is in the normal operation mode, as shown in fig. 6, the on state of the switch is: s1 is turned on at 1 and 2, and S2 is turned on at 1 and 3. The downlink signal of the device 2110MHz-2170MHz reaches the downlink radio frequency module from the digital board and then enters the duplexer, and the uplink 1920MHz-1980MHz signal enters the uplink radio frequency module through the duplexer and then enters the digital board, which is the same as the principle of the conventional digital DAS remote machine shown in FIG. 1.
When uplink signal link detection is to be performed, the device enters a test mode, and the steps and results are as follows:
1. The embedded host of the digital board controls the rf switch unit to set switch S1 to be conductive 1, 3 and switch S2 to be conductive 1, 2, as shown in fig. 5.
2. The embedded host of the digital board suspends the normal link signal processing functions of the digital processing unit. The embedded host of the digital board configures the frequency and power of a test signal transmitted by the digital processing unit, for example, the test signal power is P0 ═ 50dBm (decibel-milliwatt), the frequency point is 1950MHz, and the digital processing unit transmits the configured test signal from the TX port of the digital board.
3. The digital processing unit of the digital board counts the power of the test signal received at the RX port of the digital board and records that P1 is 5 dBm.
4. The embedded host of the digital board calculates the value of P1-P0 to be 55dB, and compares the value with the uplink gain value 55dB prestored in the system, and if the difference is within the tolerance range, the uplink signal link of the equipment is normal, and the result of the normal uplink is returned.
Similarly, if the uplink signal link of the device is abnormal for some reason, the steps and results of the test mode are as follows:
1. The embedded host of the digital board controls the rf switch unit to set switch S1 to be conductive 1, 3 and switch S2 to be conductive 1, 2, as shown in fig. 5.
2. The embedded host of the digital board suspends the normal link signal processing functions of the digital processing unit. The embedded host of the digital board configures the frequency and power of a test signal transmitted by the digital processing unit, for example, the test signal power is P0 ═ 50dBm (decibel-milliwatt), the frequency point is 1950MHz, and the digital processing unit transmits the configured test signal from the TX port of the digital board.
3. The digital processing unit of the digital board counts the power of the test signal received at the digital board RX port and records it as P1 ═ 23 dBm.
4. The numerical value of P1-P0 calculated by the embedded host of the digital board is 27dB, the numerical value is compared with an uplink gain numerical value 55dB prestored by the system and is far lower than the prestored value, the uplink signal link of the equipment is considered to be abnormal, and an uplink abnormal result is returned.
Compared with the prior art, the distributed antenna system remote terminal and the uplink signal link detection method and device thereof have the following advantages:
1. The test function of an uplink signal link can be realized by only adding an independent radio frequency switch unit and matching with the design of a software scheme by utilizing the functional module of the existing digital DAS, the scheme is novel, the hardware change is small, and the implementation and the deployment are convenient.
2. The link test function can be operated at any time according to the requirement of the equipment control end without an external reference signal, and the investment of personnel and resources for engineering uplink signal link test is saved.
it will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
the above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. a distributed antenna system remote machine is characterized by comprising an uplink radio frequency module, a digital board and a radio frequency switch unit, wherein the digital board comprises an embedded host and a digital processing unit; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
When the embedded host receives the uplink signal link detection instruction, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended;
The digital processing unit transmits a configured first test signal from a transmitting port of the digital board and receives a second test signal from a receiving port of the digital board, wherein the frequency of the first test signal is the frequency in an operating band of an uplink signal link of a remote machine of the distributed antenna system;
The embedded host judges whether the uplink signal link has a fault according to the first test signal and the second test signal, and compares the difference value of the power of the second test signal and the power of the first test signal with a preset uplink gain; and if the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
2. the distributed antenna system remote according to claim 1, further comprising a downlink radio frequency module and a duplexer; the input end of the downlink radio frequency module is connected with the radio frequency switch unit, the output end of the downlink radio frequency module is connected with the input end of the duplexer, and the output end of the duplexer is connected with the radio frequency switch unit;
when the embedded host receives a normal working instruction of the remote machine of the distributed antenna system, the transmitting port of the digital board is conducted with the input end of the downlink radio frequency module by controlling the radio frequency switch unit, and the input end of the uplink radio frequency module is conducted with the output end of the duplexer.
3. the remote unit of claim 1, wherein the embedded host compares the difference between the power of the second test signal and the power of the first test signal with a preset uplink gain; and when the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
4. the distributed antenna system remote according to any of claims 1 to 3, wherein the radio frequency switch unit comprises a first radio frequency switch and a second radio frequency switch; the movable end of the first radio frequency switch is connected with the transmitting port of the digital board, the first immovable end of the first radio frequency switch is connected with the input end of the downlink radio frequency module, the second immovable end of the first radio frequency switch is connected with the first immovable end of the second radio frequency switch, the movable end of the second radio frequency switch is connected with the input end of the uplink radio frequency module, and the second immovable end of the second radio frequency switch is connected with the output end of the duplexer.
5. A method for detecting uplink signal of remote machine in distributed antenna system includes steps:
When an uplink signal link detection instruction is received, the input end of the uplink radio frequency module is conducted with the transmitting port of the digital board by controlling the radio frequency switch unit, and the normal link signal processing function of the digital processing unit in the digital board is suspended; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
Acquiring a first test signal transmitted through a transmitting port of a digital board, wherein the frequency of the first test signal is the frequency in a working band of an uplink signal link of a remote terminal of a distributed antenna system, and the first test signal is a signal transmitted by a digital processing unit;
Acquiring a second test signal received by the digital processing unit from a receiving port of a digital board, wherein the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
Judging whether the uplink signal link has a fault according to the first test signal and the second test signal, and comparing the difference value of the power of the second test signal and the power of the first test signal with a preset uplink gain by the embedded host; and if the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
6. the remote unit uplink signal detection method of claim 5, further comprising the steps of:
When a normal working instruction of a remote terminal of the distributed antenna system is received, the transmitting port of the digital board is conducted with the input end of the downlink radio frequency module by controlling the radio frequency switch unit, the input end of the uplink radio frequency module is conducted with the output end of the duplexer, wherein the input end of the downlink radio frequency module is connected with the radio frequency switch unit, the output end of the downlink radio frequency module is connected with the input end of the duplexer, and the output end of the duplexer is connected with the radio frequency switch unit.
7. the method of claim 5, wherein the step of determining whether the uplink signal has a failure based on the first test signal and the second test signal comprises:
Comparing the difference value of the power of the second test signal and the power of the first test signal with a preset uplink gain;
And if the difference value of the difference value and the uplink gain is within a preset tolerance range, determining that the uplink signal link is normal, otherwise, determining that the uplink signal link is abnormal.
8. The remote unit uplink signal detection method of any one of claims 5 to 7, wherein the radio frequency switch unit comprises a first radio frequency switch and a second radio frequency switch; the movable end of the first radio frequency switch is connected with the transmitting port of the digital board, the first immovable end of the first radio frequency switch is connected with the input end of the downlink radio frequency module, the second immovable end of the first radio frequency switch is connected with the first immovable end of the second radio frequency switch, the movable end of the second radio frequency switch is connected with the input end of the uplink radio frequency module, and the second immovable end of the second radio frequency switch is connected with the output end of the duplexer.
9. A distributed antenna system remote-end uplink signal detection device, comprising:
The control module is used for conducting the input end of the uplink radio frequency module with the transmitting port of the digital board by controlling the radio frequency switch unit and suspending the normal link signal processing function of the digital processing unit in the digital board when receiving the uplink signal link detection instruction; the radio frequency switch unit is respectively connected with the transmitting port of the digital board and the input end of the uplink radio frequency module, and the output end of the uplink radio frequency module is connected with the receiving port of the digital board;
The digital processing unit is used for receiving a first test signal transmitted by a transmission port of a digital board, wherein the frequency of the first test signal is the frequency in a working band of an uplink signal link of a remote terminal of a distributed antenna system, and the first test signal is a signal transmitted by the digital processing unit;
A second test signal obtaining module, configured to obtain a second test signal received by the digital processing unit from a receiving port of a digital board, where the second test signal is a signal output by the uplink radio frequency module according to the received first test signal;
the embedded host compares the difference value of the power of the second test signal and the power of the first test signal with a preset uplink gain; and if the difference value between the difference value and the uplink gain is not in the preset tolerance range, determining that the uplink signal link is normal.
10. The remote unit uplink signal detection device of claim 9, wherein the rf switch unit includes a first rf switch and a second rf switch; the movable end of the first radio frequency switch is connected with the transmitting port of the digital board, the first immovable end of the first radio frequency switch is connected with the input end of the downlink radio frequency module, the second immovable end of the first radio frequency switch is connected with the first immovable end of the second radio frequency switch, the movable end of the second radio frequency switch is connected with the input end of the uplink radio frequency module, and the second immovable end of the second radio frequency switch is connected with the output end of the duplexer.
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| CN201710182906.3A CN106912069B (en) | 2017-03-24 | 2017-03-24 | Distributed antenna system remote terminal and uplink signal link detection method and device thereof |
| PCT/CN2017/119480 WO2018171282A1 (en) | 2017-03-24 | 2017-12-28 | Remote terminal of distributed antenna system and uplink signal link detection method and device therefor |
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| CN201710182906.3A CN106912069B (en) | 2017-03-24 | 2017-03-24 | Distributed antenna system remote terminal and uplink signal link detection method and device thereof |
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| CN106912069B (en) * | 2017-03-24 | 2019-12-10 | 京信通信系统（中国）有限公司 | Distributed antenna system remote terminal and uplink signal link detection method and device thereof |
| CN207995102U (en) * | 2017-07-04 | 2018-10-19 | 京信通信系统（中国）有限公司 | Antenna feeder Network Fault Detection device and remote termination |
| CN108770009B (en) * | 2018-07-06 | 2021-04-06 | 京信通信系统（中国）有限公司 | Link fault positioning method, device, equipment and readable storage medium |
| CN109474354B (en) * | 2018-12-17 | 2021-05-28 | 京信通信系统（中国）有限公司 | Digital radio frequency signal equipment, signal link detection method and device |
| CN111181595B (en) * | 2019-12-31 | 2021-08-24 | 京信网络系统股份有限公司 | Second harmonic cancellation method and device and DAS remote machine |
| CN114567392B (en) * | 2022-03-10 | 2023-07-28 | 四川恒湾科技有限公司 | Uplink self-detection method for remote radio unit |
| CN117336766B (en) * | 2023-09-28 | 2024-06-14 | 北京唯得科技有限公司 | Operation monitoring method and system of 5G MIMO frequency-shifting two-way system |
| CN117255036B (en) * | 2023-11-20 | 2024-02-23 | 中国西安卫星测控中心 | Link connectivity checking method, device and equipment of multi-target measurement and control system |
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| WO2018171282A1 (en) | 2018-09-27 |
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