CN102064880A - Radio frequency remote module and power amplifier protection method thereof - Google Patents
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Abstract
The invention discloses a radio frequency remote module and a power amplifier protection method thereof. The method comprises the following steps of: detecting optical signals, namely detecting whether optical signals are absent at the optical port of the radio frequency remote module, and if so, closing baseband signals output to a power amplifier, wherein the radio frequency remote module comprises an optical signal detection unit and a baseband signal closing unit, the optical signal detection unit is used for detecting whether the optical signals are absent at the optical port of the radio frequency remote module, and if so, the optical signal detection unit sends a baseband signal closing signal to the baseband signal closing unit; and the baseband signal closing unit closes the baseband signals sent to the power amplifier according to the baseband signal closing signal. The invention can improve the power amplifier protection function of the radio frequency remote module, and improves the reliability of a distributed base station.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a radio remote module and a power amplifier protection method thereof.
Background
Compared with the communication systems of the first Generation analog system (1G) and the second Generation digital systems such as GSM and TDMA, the 3G (3rd Generation, third Generation mobile communication technology) is a new Generation mobile communication system combining wireless communication and multimedia communication such as internet, which can process various media forms such as images, music, video streams, etc., and provide various information services including web browsing, teleconference, electronic commerce, etc. To provide such services, wireless networks must be able to support different data transmission speeds, that is, at least 2Mbps (megabytes/84 kbps (kilobytes/second) and 144kbps transmission speeds, respectively, in indoor, outdoor, and vehicular environments.
3G networks heavily use a distributed base station architecture. The distributed base station architecture is shown in fig. 1 and includes an RRU (radio remote unit) and a BBU (baseband processing unit). The BBU and the RRU are transmitted by optical fiber, and the RRU is connected to an antenna by a coaxial cable and a power divider (coupler), namely, the trunk adopts the optical fiber and the branch adopts the coaxial cable. The RRU can be used as a remote module of a macro base station besides being connected with the BBU, has the characteristics of small volume, light weight and simple and convenient installation, and meets the requirements of wireless coverage of cities, suburbs, rural areas, roads, railways and the like.
For the downlink direction: the optical fiber is directly connected to the RRU from the BBU, and baseband digital signals are transmitted between the BBU and the RRU, so that the base station can control signals of a certain user to be transmitted from a specified RRU channel, and the interference to the users on other channels of the cell can be greatly reduced.
For the uplink direction: the user mobile phone signals are received by the channel with the closest distance and then transmitted to the base station from the channel through the optical fiber, so that the interference among users on different channels can be greatly reduced.
The BBU + RRU scheme is very flexible in capacity configuration, and can support the capacity expansion of each channel from 1/6 carriers to 3 carriers by configuring the BBU according to the capacity requirement on the premise of not changing the RRU and an indoor distribution system. Theories and practices prove that the scheme has the following characteristics: the unique multi-channel algorithm realizes space isolation, and can reduce interference; coverage and capacity can be planned independently; reducing the dependence on the main amplifier; the baseband capacity can be shared, and the capacity expansion capacity is large; the optical fiber is lossless, the trunk is simple and convenient to arrange, and the RRU is flexible to arrange.
In the existing mobile communication system, a power amplifier module completes the function of amplifying a forward transmission signal and outputting the amplified forward transmission signal by an antenna, and the power amplifier module is a key module of a base station system, and no signal is output if the power amplifier module fails and is damaged. The normal communication of the user whose service area is covered by the power amplifier module is affected, and the consequences are serious. Therefore, base station equipment manufacturers or power amplifier manufacturers need to add a lot of protection circuits in the power amplifier module, but in this mode of BBU + RRU, for the radio remote module, due to the working specificity and cost considerations, the weight and structure of the radio remote module cannot be too large, the protection circuits are difficult to arrange, and the protection function of the radio remote module is greatly reduced.
Disclosure of Invention
In view of the foregoing background, the present invention provides a radio remote module and a power amplifier protection method thereof, which can improve the power amplifier protection function of the radio remote module.
In order to solve the technical problems, the invention adopts the following technical scheme:
a power amplifier protection method of a radio remote module comprises the following steps:
and (3) optical signal detection processing: and detecting whether an optical port of the radio frequency remote module has no optical signal, if so, closing a baseband signal output to the power amplifier.
In an embodiment of the foregoing method, the optical signal detection is performed by optical module hardware detection, or a control word LOS in a BBU + RRU communication protocol.
In an embodiment of the above method, further comprising:
one or more of a data format detection process, a data parity check, and a power comparison process, wherein,
and (3) data format detection processing: detecting whether a data format received by an optical port of the radio remote module is abnormal, if so, closing a baseband signal output to a power amplifier;
data parity checking: judging whether the parity check of the data received by the optical port of the radio remote module is abnormal, if so, closing the baseband signal output to the power amplifier;
and power comparison processing: and comparing whether the real-time power of the data received by the optical port of the radio remote module exceeds a preset threshold value, and if so, closing the baseband signal output to the power amplifier.
In an embodiment of the foregoing method, the data format detection is performed by a control word LOF in a BBU + RRU communication protocol.
In an embodiment of the above method, further comprising:
data parity checking: and judging whether the parity check of the data received by the optical port of the radio remote module is abnormal or not, if so, closing the baseband signal output to the power amplifier.
In one embodiment of the above method, when the data format detection process and the data parity are included, the data format detection process and the data parity are performed sequentially.
In one embodiment of the above method, when the data format detection process, the data parity, and the power comparison process are included, the data format detection process, the data parity, and the power comparison process are performed in sequence.
The invention also provides a radio remote module, which comprises an optical signal detection unit and a baseband signal closing unit, wherein,
the optical signal detection unit: the optical interface is used for detecting whether an optical signal does not exist in the optical interface of the radio remote module, if so, a baseband signal closing signal is output to the baseband signal closing unit;
the baseband signal closing unit: and closing the closing signal according to the baseband signal, and closing the baseband signal output to the power amplifier.
In an embodiment of the radio remote unit, the radio remote unit further includes:
one or more of a data format detection unit, a data parity unit, and a power comparison unit, wherein,
a data format detection unit: the remote radio frequency module is used for detecting whether a data format received by an optical port of the remote radio frequency module is abnormal, if so, outputting a baseband signal closing signal to the baseband signal closing unit;
data parity unit: the optical interface is used for judging whether parity check of data received by the optical port of the radio remote module is abnormal or not, if so, a baseband signal closing signal is output to the baseband signal closing unit;
a power comparison unit: and the real-time power comparison unit is used for comparing whether the real-time power of the data received by the optical port of the radio remote unit exceeds a preset threshold value, and if so, outputting a baseband signal closing signal to the baseband signal closing unit.
The invention can improve the power amplifier protection function of the radio frequency remote module and improve the reliability of the distributed base station by detecting the optical signal of the optical port of the radio frequency remote module and closing the baseband signal output to the power amplifier when no optical signal is detected.
Furthermore, the invention also judges whether to close the baseband signal output to the power amplifier by the modes of data format detection, parity check, power comparison and the like, thereby further improving the power amplifier protection function of the radio frequency remote module.
Drawings
FIG. 1 is a system block diagram of a typical BBU and RRU connection;
fig. 2 is a block diagram of a remote radio module according to an embodiment of the present invention;
fig. 3 is a flowchart of a power amplifier protection method of a radio remote unit according to an embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the accompanying drawings.
Fig. 2 is a functional structure block diagram of the inside of the remote radio module, which mainly includes the following parts: the system comprises a control system module, a downlink system module and an uplink system module.
The control system includes: the system comprises an optical module, an optical interface processing module, a clock module, a signaling processing module, an external interface control module and an IQ data module. Wherein,
an optical module: for off-signal interaction with the BBU.
Optical interface processing module: the device is used for analyzing baseband IQ data and signaling from an optical signal sent by a BBU according to an optical interface protocol (generally CPRI or OBSAI).
A signaling processing module: for management of traffic signaling and control signaling.
A clock module: a synchronized clock of the base station is provided.
External interface control module: the control system is used for processing control instructions and state information of devices such as a power supply and a temperature sensor.
An IQ data module: and the IQ data analyzed by the optical interface processing module is processed.
The downlink system comprises: the device comprises a downlink data processing module, a DAC (digital-to-analog conversion) module, a downlink radio frequency link module and a power amplifier module (PA). Wherein,
a downlink data processing module: the function of the IQ data can be realized by a programmable logic device FPGA, the functions of parity check and power detection and fine tuning of the IQ data are mainly completed, and the processed IQ data is sent to a DAC.
A DAC module: the digital up-conversion DUC is used for converting the RRU IQ data transmitted by the downlink data processing module into a signal of a certain intermediate frequency (in this example, the frequency conversion function is performed in the DAC, but of course, the frequency conversion function can also be performed in the downlink data processing module), and then the signal is converted into an analog radio frequency signal by digital-to-analog conversion and is transmitted to the downlink radio frequency link module.
A downlink radio frequency link module: the gain adjusting circuit is used for adjusting the gain of the radio frequency signal under the condition of meeting the requirements of related radio frequency indexes and meeting the requirements of a power amplifier on input signals.
A PA module: the linear amplification circuit is used for completing the linear amplification of the radio frequency signal so that the radio frequency signal meets the power requirement of antenna port transmission.
The uplink system includes: a duplexer module (DFL), an uplink radio frequency link module, an ADC (analog-to-digital conversion) module and an uplink data processing module.
A DFL module: the device is used for isolating the transmitting and receiving signals and ensuring that the receiving and the transmitting can work normally at the same time.
An uplink radio frequency link module: the method is used for adjusting the radio frequency indexes such as the gain of the uplink radio frequency signal and the like, and meets the requirement of a system on the input signal.
An ADC module: and the uplink data processing module is used for converting the analog radio frequency signal sent by the uplink radio frequency link module into a digital signal and sending the digital signal to the uplink data processing module for processing.
The uplink data processing module: the function of the IQ data can be realized by a programmable logic device FPGA, the IQ data power detection and fine tuning functions are mainly completed, and the processed IQ data are sent to a control system module.
The power amplifier protection of the radio frequency remote module of the embodiment of the invention mainly comprises the following steps:
step 1, judging whether the optical port has no optical signal, if no optical signal exists, turning off the baseband signal, and if the optical port is normal, jumping to step 2. Whether the optical interface has no optical signal can be judged through hardware detection of the optical module or through a control word LOS analyzed in a communication protocol of BBU + RRU.
And 2, judging whether the data format received by the optical port is wrong, if so, judging that the frame is lost, turning off the baseband signal, and if so, jumping to the step 3. And judging whether the data format received by the optical port is wrong or not can be judged through a control word LOF (loss of tolerance) analyzed in a communication protocol of the BBU + RRU.
And 3, judging whether the parity check of the data received by the optical port is abnormal or not, if so, turning off the baseband signal, and if not, jumping to the step 4. The judgment of whether the parity check of the data received by the optical port is abnormal can be judged through baseband IQ data analyzed from a communication protocol of BBU + RRU, each frame of baseband data is 16 bits, wherein 0-14 bits are data bits, 15 bits are parity check bits, and whether the parity check is abnormal can be verified through a predefined check mode.
And 4, judging whether the instantaneous power of the baseband signal is abnormal or not, and if so, turning off the baseband signal. The method specifically comprises the following steps:
41. setting an output power threshold value of a power amplifier;
42. the downlink data processing module performs real-time power calculation on IQ data of each carrier sent by the BBU, namely I2+Q2；
43. Comparing the calculated real-time power with a set output power threshold value, and if the power is normal (not exceeding the threshold value), normally outputting a baseband signal; if the power is over-power, the path of IQ data is closed immediately, and the baseband IQ data output is not recovered until the power is less than a threshold value.
In an application scenario, assuming that an RRU is under an outdoor remote radio operation condition, due to the fact that the optical fiber connection between the RRU and a BBU is loosened, the transmission data and the clock are disordered, so that the bottom logic of the RRU analyzes wrong IQ data through a CPRI protocol, and an instantaneous high-power signal may be caused, and the RRU performs power amplifier protection according to the above process:
1. and performing optical signal detection in an optical interface processing module in the control system, and judging whether an optical signal does not exist through hardware detection of an optical module or through a control word LOS (LOSs of interference) analyzed in a communication protocol of BBU (base band unit) + RRU (remote radio unit). If no optical signal exists, the optical interface processing module closes the data output to the downlink data processing module, and if the data is normal, the next step is carried out.
2. And detecting a data format in an optical interface processing module in the control system, judging whether the data format is abnormal or not through a control word LOF analyzed from a communication protocol of BBU + RRU, if so, closing data output to an IQ data module by the optical interface processing module, and if so, entering the next step.
3. And performing parity check in an IQ data module in the control system, judging whether the parity check is abnormal or not through baseband IQ data analyzed from a communication protocol of the BBU + RRU, if so, closing the IQ data input to the downlink data processing module, and if so, entering the next step.
4. Real-time power calculation of IQ data of each carrier sent by BBU is carried out in a downlink data processing module of RRU, and the calculated real-time power I2+Q2And comparing the power with a preset threshold value, if the power is normal, normally outputting a baseband signal, and if the power is over-power, immediately closing the path of IQ data until the power is less than the threshold value, and recovering the output of the baseband IQ data.
It should be understood that the sequence of the above steps is only an example, and does not indicate that the above power amplifier protection must be performed in this order. Of course, in practice, the above sequence has a better protective effect. One or more of the data format detection processing, the data parity check processing, and the power comparison processing may be arbitrarily selected, and the selected processing may be performed in an arbitrary order. Generally, when data format detection processing and data parity check are included, the data format detection processing and the data parity check are performed in sequence; when the data format detection processing, the data parity check and the power comparison processing are included, the data format detection processing, the data parity check and the power comparison processing are sequentially performed.
The remote radio module according to the embodiment of the present invention may be formed by an optical signal detection unit and a baseband signal shutdown unit, in terms of power amplifier protection function, wherein,
an optical signal detection unit: the optical interface is used for detecting whether an optical signal does not exist in the optical interface of the radio remote module, if so, a baseband signal closing signal is output to the baseband signal closing unit;
a baseband signal shutdown unit: and closing the closing signal according to the baseband signal, and closing the baseband signal output to the power amplifier.
The remote radio frequency module may further include: and the data format detection unit is used for detecting whether the data format received by the optical port of the radio remote unit is abnormal, and if so, outputting a baseband signal closing signal to the baseband signal closing unit.
The remote radio frequency module may further include: and the data parity check unit is used for judging whether parity check of data received by an optical port of the radio remote module is abnormal or not, and if so, outputting a baseband signal closing signal to the baseband signal closing unit.
The remote radio frequency module may further include: and the power comparison unit is used for comparing whether the real-time power of the data received by the optical port of the radio remote unit exceeds a preset threshold value, and if so, outputting a baseband signal closing signal to the baseband signal closing unit.
The invention considers the power amplifier protection of the RRU from the whole RRU system, and can accurately and timely close the signal input to the PA by monitoring the relevant working state and information of the RRU in real time, thereby playing a good protection role on the PA, increasing the reliability of the base station and improving the competitiveness of the mobile communication system.
The foregoing is a more detailed description of the invention, taken in conjunction with specific preferred embodiments thereof, but is provided by way of example for purposes of illustration only and is not intended to limit the invention to the particular embodiments described. It will be apparent to those skilled in the art that various equivalent changes and substitutions are possible without departing from the spirit of the invention, and it is intended that all such changes and substitutions fall within the scope of the invention.
Claims (10)
1. A power amplifier protection method of a radio remote module is characterized by comprising the following steps:
and (3) optical signal detection processing: and detecting whether an optical port of the radio frequency remote module has no optical signal, if so, closing a baseband signal output to the power amplifier.
2. The method of claim 1, wherein the optical signal detection is performed by optical module hardware detection, or a control word LOS in a BBU + RRU communication protocol.
3. The method of claim 1 or 2, further comprising one or more of a data format detection process, a data parity check, and a power comparison process, wherein,
and (3) data format detection processing: detecting whether a data format received by an optical port of the radio remote module is abnormal, if so, closing a baseband signal output to a power amplifier;
data parity checking: judging whether the parity check of the data received by the optical port of the radio remote module is abnormal, if so, closing the baseband signal output to the power amplifier;
and power comparison processing: and comparing whether the real-time power of the data received by the optical port of the radio remote module exceeds a preset threshold value, and if so, closing the baseband signal output to the power amplifier.
4. The method of claim 3, wherein the data format detection is performed by a control word LOF in a BBU + RRU communication protocol.
5. The method of claim 1, further comprising a data format detection process and a data parity, the data format detection process and the data parity being performed sequentially, wherein,
and (3) data format detection processing: detecting whether a data format received by an optical port of the radio remote module is abnormal, if so, closing a baseband signal output to a power amplifier;
data parity checking: and judging whether the parity check of the data received by the optical port of the radio remote module is abnormal or not, if so, closing the baseband signal output to the power amplifier.
6. The method of claim 1, further comprising a data format detection process, a data parity check, and a power comparison process, the data format detection process, the data parity check, and the power comparison process being performed in sequence;
and (3) data format detection processing: detecting whether a data format received by an optical port of the radio remote module is abnormal, if so, closing a baseband signal output to a power amplifier;
data parity checking: judging whether the parity check of the data received by the optical port of the radio remote module is abnormal, if so, closing the baseband signal output to the power amplifier;
and power comparison processing: and comparing whether the real-time power of the data received by the optical port of the radio remote module exceeds a preset threshold value, and if so, closing the baseband signal output to the power amplifier.
7. A radio remote module comprises an optical signal detection unit and a baseband signal closing unit, wherein,
the optical signal detection unit: the optical interface is used for detecting whether an optical signal does not exist in the optical interface of the radio remote module, if so, a baseband signal closing signal is output to the baseband signal closing unit;
the baseband signal closing unit: and according to the baseband signal closing signal, closing the baseband signal output to the power amplifier.
8. The remote radio module of claim 7, wherein the optical signal detection unit performs optical signal detection through optical module hardware detection or a control word LOS in a BBU + RRU communication protocol.
9. The remote radio module according to claim 7 or 8, further comprising one or more of a data format detection unit, a data parity unit, and a power comparison unit, wherein,
a data format detection unit: the remote radio frequency module is used for detecting whether a data format received by an optical port of the remote radio frequency module is abnormal, if so, outputting a baseband signal closing signal to the baseband signal closing unit;
data parity unit: the optical interface is used for judging whether parity check of data received by the optical port of the radio remote module is abnormal or not, if so, a baseband signal closing signal is output to the baseband signal closing unit;
a power comparison unit: and the real-time power comparison unit is used for comparing whether the real-time power of the data received by the optical port of the radio remote unit exceeds a preset threshold value, and if so, outputting a baseband signal closing signal to the baseband signal closing unit.
10. The remote radio module of claim 9, wherein the data format detection unit performs data format detection through a control word LOF in a BBU + RRU communication protocol.
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| CN2009101101992A CN102064880A (en) | 2009-11-13 | 2009-11-13 | Radio frequency remote module and power amplifier protection method thereof |
| PCT/CN2010/073266 WO2010148888A1 (en) | 2009-11-13 | 2010-05-26 | Radio remote module and power amplifier protection method thereof |
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| CN107612588A (en) * | 2017-10-26 | 2018-01-19 | 京信通信系统（中国）有限公司 | A kind of power amplification protecting method and device |
| CN107612588B (en) * | 2017-10-26 | 2019-06-25 | 京信通信系统（中国）有限公司 | A kind of power amplification protecting method and device |
| CN110505025A (en) * | 2019-08-19 | 2019-11-26 | 惠州Tcl移动通信有限公司 | Mobile terminal and its radio-frequency transmissions detection method, computer-readable medium |
| CN110505025B (en) * | 2019-08-19 | 2022-05-06 | 惠州Tcl移动通信有限公司 | Mobile terminal, radio frequency emission detection method thereof and computer readable medium |
| CN112583487A (en) * | 2019-09-27 | 2021-03-30 | 大唐移动通信设备有限公司 | Bridging system and method |
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| Publication number | Publication date |
|---|---|
| WO2010148888A1 (en) | 2010-12-29 |
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