WO2018058619A1 - 一种无源互调pim消除方法、装置及基站 - Google Patents
一种无源互调pim消除方法、装置及基站 Download PDFInfo
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- WO2018058619A1 WO2018058619A1 PCT/CN2016/101285 CN2016101285W WO2018058619A1 WO 2018058619 A1 WO2018058619 A1 WO 2018058619A1 CN 2016101285 W CN2016101285 W CN 2016101285W WO 2018058619 A1 WO2018058619 A1 WO 2018058619A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2623—Reduction thereof by clipping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/14—Backbone network devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0425—Circuits with power amplifiers with linearisation using predistortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0433—Circuits with power amplifiers with linearisation using feedback
Definitions
- the present application relates to the field of communications technologies, and in particular, to a passive intermodulation (PIM) cancellation method, apparatus, and base station.
- PIM passive intermodulation
- a PIM in a network device is an intermodulation signal generated by a downlink transmission signal directly or indirectly through a passive device. If the PIM falls within the uplink receiving signal band, Will affect the quality of the received signal.
- PIM cancellation technology is usually used in the Base Band Unit (BBU) or Radio Remote Unit (RRU) to improve the quality of the received signal.
- BBU Base Band Unit
- RRU Radio Remote Unit
- the BBU models the signal in the RRU transmission channel based on the baseband signal to be transmitted to the RRU, obtains a cancellation signal for canceling the PIM, and then superimposes the cancellation signal on the BBU.
- the PIM generated by the RRU's transmitted signal is eliminated.
- the cancellation signal is obtained by modeling the baseband signal to be sent by the BBU to the RRU, and the transmission signal on the RRU side cannot be accurately restored. Therefore, the cancellation signal obtained after the BBU modeling cannot completely eliminate the PIM, thereby making There is still interference in the received signal of the uplink.
- the embodiment of the present application provides a method, an apparatus, and a base station for eliminating a passive intermodulation, which are used to provide a scheme for eliminating PIM, and reduce interference of PIM on an uplink received signal, thereby improving the quality of the received signal.
- the present application provides a passive intermodulation cancellation method, including: a network device acquires N backhaul information, and the backhaul information includes an initial phase of each carrier in a transmit channel. Information, where N is an integer greater than or equal to 1; the network device cancels the PIM of the received signal in the receiving channel of the network device according to the N backhaul information.
- the N transmit channels are transmit channels of M RRUs, where M is greater than or equal to 1 and less than or equal to N. At least one of the transmitting channels may be included in each RRU.
- the network device may be a BBU or an RRU, or may be another network device that performs PIM processing, which is not limited in this application.
- the initial phase of the carrier refers to the initial phase of the carrier used by the transmit signal to be processed during the frequency shifting process.
- the initial phase information of the carrier is not known before the frequency of the signal to be transmitted is frequency-shifted. It is also inaccurate to model the transmitted signal without knowing the initial phase information of the carrier, and the PIM cancellation is performed.
- different RRUs are used.
- the carrier initial phase information processing information of the other party cannot be known. Therefore, receiving the backhaul information and performing PIM cancellation according to the backhaul information can more accurately obtain the canceling signal for eliminating PIM, thereby improving PIM cancellation performance and improving The quality of the signal received by the entire system. Further, the network device receives the backhaul information from multiple RRUs, which can implement the PIM cancellation performance in the multiple RRU system, thereby improving the quality of the received signal of the entire system.
- the backhaul information may be initial phase information of each carrier, for example, an initial phase value or indication information that may indicate an initial phase value. Sending the initial phase information directly can reduce the amount of data of the backhaul information and save the transmission bandwidth.
- the network device receives N backhaul signals, where the N backhaul signals are respectively frequency shifted single carrier signals of the N transmit channels or a multi-carrier mixed signal that is multi-carrier combined, where N is an integer greater than or equal to 1; and the network device cancels the PIM of the received signal in the receiving channel of the network device according to the N backhaul signals.
- the frequency shifting refers to moving the relative position of the frequency to be transmitted in the entire frequency band according to the currently processed signal to the corresponding carrier position.
- the multi-carrier combining means that time-domain superimposition of signals to be transmitted at a plurality of different carrier positions is performed to obtain a multi-carrier mixed signal, wherein all signals to be transmitted in the plurality of different carrier positions may be all to be transmitted.
- the signals are subjected to frequency shift processing, and at least one signal to be transmitted is not subjected to frequency shifting and other signals are subjected to frequency shift processing.
- the network device acquires a frequency-shifted single-carrier signal or a multi-carrier hybrid that is multi-carrier combined When the signal is combined, a signal including the initial phase information of the carrier is obtained, and the initial phase information of the carrier is not known by modeling, and the initial phase information processing information of the carrier is not known between different RRUs.
- the canceling signal for eliminating PIM can be obtained more accurately, thereby improving the PIM cancellation performance, thereby improving the quality of the received signal of the entire system.
- the network device receives the backhaul signal from multiple RRUs, which can implement the PIM cancellation performance in the multiple RRU system, thereby improving the quality of the received signal of the entire system.
- the backhaul signal is subjected to frequency shift processing or multi-carrier combining processing
- it can also be processed by Crest Factor Reduction (CFR).
- CFR Crest Factor Reduction
- the CFR-processed signal includes signal amplitude change information (for example, the degree of peak compression), and the signal amplitude change information cannot be learned by modeling, and the CFR processing information of the other party cannot be known between different RRUs. Therefore, obtaining the CFR-processed backhaul signal can further improve the accuracy of PIM cancellation.
- the back signal may also be subjected to digital pre-distortion (DPD) )deal with.
- DPD-processed signal contains more information about the amplitude and/or phase of the signal (for example, amplitude and/or phase change information when the signal is predistorted), which further enhances PIM cancellation. accuracy.
- the back signal may also be a power amplifier (PA).
- PA power amplifier
- the feedback signal may be a feedback signal used for the DPD processing, or may be a feedback signal for other purposes, which is not limited in this application.
- the PA-amplified signal is closer to the real signal that produces PIM, so better PIM cancellation can be achieved.
- the backhaul signal may be processed by other intermediate radio frequency links between or before the foregoing processing, which is not limited in this application.
- the network device is a BBU
- the method further includes: The connected M RRUs send the N backhaul information to the network device, where M is an integer greater than or equal to 1 and less than or equal to N.
- the network device is an RRU
- the method further includes: The M RRUs other than the network device send the N backhaul information to the network device, where M is an integer greater than or equal to 1 and less than or equal to N.
- the M RRUs are connected to the same BBU as the network device.
- the network device is an RRU
- the method further includes: The BBU connected to the network device receives the N pieces of backhaul information sent by the M RRUs, where M is an integer greater than or equal to 1 and less than or equal to N; the BBU sends the N backhaul information to the network device.
- any one of the M RRUs may include at least one transmitting channel, that is, any one of the RRUs may send at least one backhaul. information.
- any one of the M RRUs may further forward at least one backhaul information of the other RRUs to the network device, so that the network device is used for PIM cancellation, for example, one of the M RRUs.
- several RRUs may receive the backhaul information sent by other RRUs, and then send the received backhaul information of other RRUs and their own backhaul information to the network device.
- the RRU sends the backhaul information to the network device, specifically:
- the RRU may divide a backhaul information into K-segment signals and send the K-segment signals to the network device, where K is an integer greater than or equal to 1.
- the backhaul information may also be interleaved.
- the segmentation transmission of the backhaul information can dynamically adapt the interface rate between the RRU and the network device to ensure that the backhaul information can be transmitted. lose.
- the present application provides a network device having a function of implementing the actual network device behavior in the method provided by the foregoing first aspect.
- the functions may be implemented by hardware or by corresponding software implemented by hardware.
- the hardware or software includes one or more modules corresponding to the functions described above.
- the network device may be a BBU or an RRU.
- the present application provides an RRU having the functionality to implement any one or more of the RRU behaviors of the methods provided by the first aspect described above.
- the functions may be implemented by hardware or by corresponding software implemented by hardware.
- the hardware or software includes one or more modules corresponding to the functions described above.
- the present application provides a BBU having a function of implementing the actual BBU behavior of the method provided by the above first aspect.
- the functions may be implemented by hardware or by corresponding software implemented by hardware.
- the hardware or software includes one or more modules corresponding to the functions described above.
- the application provides a network device, where the structure of the network device includes a receiver and a processor.
- the receiver is configured to support the network device to receive the information involved in the method of the first aspect
- the processor is configured to support the network device to perform a corresponding function in the method of the first aspect, for example, performing PIM cancellation according to the backhaul information.
- the network device may further include a communication unit for supporting the network device to communicate with other network devices, such as receiving information or instructions sent by other network devices, and/or transmitting information. Or instructions to other network devices.
- the structure of the network device may further include a memory for coupling with the processor to save necessary program instructions and data of the network device.
- the application provides an RRU, and the RRU includes a processor and a transmitter.
- the processor is configured to support the RRU to perform any one or more of the RRU behaviors of the first aspect method, for example, to process signals in at least one transmit channel to obtain at least one backhaul information.
- the transmitter is configured to support the RRU to transmit information involved in the method of the above first aspect, for example, to transmit at least one backhaul information.
- the RRU can also To include a receiver for supporting the RRU to receive the information involved in the method of the first aspect above.
- the processor and the receiver of the RRU may also be configured to support the RRU to perform the corresponding function of the network device in the method of the foregoing first aspect.
- the structure of the RRU may further include a memory for coupling with the processor to save necessary program instructions and data of the RRU.
- the present application provides a BBU, which includes a receiver and a transmitter.
- the receiver is configured to support the BBU to receive information involved in the method of the first aspect described above.
- the transmitter is configured to support the BBU to transmit information involved in the method of the first aspect above.
- the BBU may further include a processor, where the processor is configured to support or control the BBU to perform the transceiving signal operation involved in the foregoing method of the first aspect.
- the processor and the receiver may also be configured to support the BBU to perform the corresponding function of the network device in the method of the foregoing first aspect.
- the structure of the BBU may further include a memory for coupling with the processor to save necessary program instructions and data of the BBU.
- the application provides a base station, where the base station includes the network device of the fifth aspect and at least one RRU of the sixth aspect.
- the base station may further include the BBU described in the seventh aspect.
- the present application provides a computer storage medium for storing computer software instructions for use in the above network device, comprising a program designed to perform the above aspects.
- the present application provides a computer storage medium for storing computer software instructions for use in the above RRU, comprising a program designed to perform the above aspects.
- the present application provides a computer storage medium for storing computer software instructions for use by the BBU, including a program designed to perform the above aspects.
- FIG. 1 is a schematic diagram of signal processing of a base station according to an embodiment of the present application
- FIG. 2 is a schematic diagram of a combined processing provided by an embodiment of the present application.
- FIG. 3 is a schematic flowchart of a passive intermodulation cancellation method according to an embodiment of the present disclosure
- FIG. 4 is a schematic diagram of implementation of a method for eliminating passive intermodulation according to an embodiment of the present disclosure
- FIG. 5 is a schematic diagram of processing of a backhaul signal according to an embodiment of the present application.
- FIG. 6 is a schematic diagram of another implementation of a passive intermodulation cancellation method according to an embodiment of the present disclosure.
- FIG. 7 is a schematic diagram of another implementation of a passive intermodulation cancellation method according to an embodiment of the present disclosure.
- FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
- FIG. 9 is a schematic structural diagram of an RRU according to an embodiment of the present disclosure.
- FIG. 10 is a schematic structural diagram of a BBU according to an embodiment of the present disclosure.
- FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present application.
- the embodiments of the present application can be applied to a Long Term Evolution (LTE) system and a subsequent evolved system such as the 5th Generation Mobile Communication (5G), a Universal Mobile Telecommunications System (UMTS).
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- the wireless communication system of the Global System for Mobile Communication (GSM) system can also be applied to other communication systems that need to implement PIM cancellation.
- GSM Global System for Mobile Communication
- network and “system” are often used interchangeably, but those skilled in the art can understand the meaning. The terms referred to in this application are first explained below.
- the base station in the present application may include various forms of a macro base station, a micro base station, a relay station, an access point, an RRU, and the like.
- the wireless communication with the user equipment may also be another network device having a wireless communication function.
- the name of the device with base station function may be different, for example, in an LTE network, called evolved NodeB (eNB or eNodeB), in 3G (the 3rd Generation, third generation) In the network, it is called Node B (Node B).
- a receiving channel or a transmitting channel in the present application refers to a channel in a base station for receiving or transmitting a wireless signal and processing a wireless signal received or to be transmitted.
- the receiving channel includes a receiving channel in the BBU and the RRU
- the transmitting channel includes a transmitting channel in the BBU and the RRU.
- the receiving channel or the transmitting channel is in one-to-one correspondence with the antenna for receiving or transmitting the wireless signal, and the RRU may include at least one transmitting channel and at least one receiving channel, but the present application does not limit this.
- the carrier in this application refers to a radio wave having a specific frequency and a certain bandwidth (for example, 10M) for carrying a wireless signal to be transmitted.
- the frequency band refers to a part of spectrum resources used in wireless communication, such as the 1800M frequency band used in the LTE system.
- a frequency band contains multiple carriers. For example, if the bandwidth of the 1800M band is 75M, the frequency band may include m (m ⁇ 20 carriers of 20M bandwidth and n (n ⁇ 10 carriers of 10M bandwidth).
- a receive channel or transmit channel can process signals comprising at least one carrier.
- the solution provided by the present application is generally applied to a base station in a wireless communication system, and can also be applied to other devices or devices that need to implement PIM cancellation.
- the base station in the existing wireless communication system usually includes a BBU and at least one RRU connected to the BBU, and may also include more BBUs and RRUs connected thereto, which is not limited in this application.
- FIG. 1 is a schematic diagram of a connection between an RRU and a BBU in a possible base station.
- one BBU 101 and a plurality of RRUs 102 are connected by a Common Public Radio Interface (CPRI).
- CPRI Common Public Radio Interface
- the BBU 101 and the RRU 102 in FIG. 1 are signal processing procedures of the BBU and the RRU according to the embodiments of the present application.
- a transmitting channel in the RRU performs CPRI interface processing (for example, deframing), intermediate frequency processing, radio frequency processing, etc. on the baseband signal sent by the BBU, and finally sends the processed RF signal to the antenna for transmission.
- the radio signal received by the antenna is also converted into a baseband signal by the RRU through radio frequency processing, intermediate frequency processing, etc., and sent to the BBU through the CPRI port for baseband processing.
- the RRU may include at least one transmitting channel and at least one receiving channel, which is not limited in this application.
- the RRU In the transmitting channel, the RRU first combines the baseband signals, and in combination with the specific process of the combined processing shown in FIG. 2, the process of combining the baseband signals may include upsampling, frequency shifting, and more. Carrier signal superposition and other processes. Specifically, when the signal processed by the RRU is a single carrier signal, the RRU performs upsampling and frequency shift processing on the baseband signal. In particular, the currently processed single carrier signal may also not undergo frequency shift processing, such as the carrier at the time. When the advantage is in the middle of the frequency band in which it is located, there is no need to frequency shift the signal. For example, in a frequency band with a bandwidth of 75M, the relative position of the entire frequency band is usually described by -37.5M to +37.5M.
- the signal processed by the RRU is a single carrier signal of 10M bandwidth, and the carrier used by the current signal is If the relative position in the 75M bandwidth is 27.5M to 37.5M, the signal needs to be frequency-shifted. If the relative position of the carrier used in the current signal in the 75M bandwidth is -5M to +5M, the signal does not need to be used. Frequency shifting.
- the RRU upsamples the signal, then shifts the multiple signals according to different carrier positions at which the multiple signals are located, and then performs multiple signals after frequency shifting. Domain superposition, that is, multi-carrier combining, to obtain a multi-carrier mixed signal.
- the multi-carrier signal may also have a signal that does not need to be frequency-shifted, and the specific situation is the same as the single-carrier signal that does not need to be frequency-shifted, and details are not described herein.
- the initial phase of the carrier signal needs to be determined according to a numerically controlled oscillator (NCO).
- the RRU After the combination, the RRU performs Crest Factor Reduction (CFR) processing on the signal, and the peak value of the signal after CFR processing is compressed.
- CFR Crest Factor Reduction
- the CFR processing scheme is different, and the compressed signal is also different.
- the RRU will further perform digital pre-distortion (DPD) processing, and the DPD processing will dynamically adjust the amplitude and phase of the signal to reduce the distortion of the transmitted signal.
- DPD digital pre-distortion
- the DPD-processed signal is converted into an analog signal by a digital-to-analog conversion (DAC), and is transmitted to a radio frequency by transmitting RF processing, and then passed through a power amplifier (Power Amplifier, PA, referred to as a power amplifier). Amplification, sent through the antenna after processing by the duplexer. After the signal is amplified by the PA, the feedback channel generates a feedback signal for the DPD or for other modules on the front end according to the post-PA signal.
- DAC digital-to-analog conversion
- PA Power Amplifier
- PA Power Amplifier
- PA Power Amplifier
- the feedback channel After the signal is amplified by the PA, the feedback channel generates a feedback signal for the DPD or for other modules on the front end according to the post-PA signal.
- the signal used to calculate the cancellation signal during PIM cancellation is closer to the generation.
- the processing position of PIM the better the effect of PIM elimination.
- the BBU models the radio frequency signal that generates the PIM based on the baseband signal, and calculates the cancellation signal using the signal generated by the modeling. Since the initial phase of the carrier signal cannot be known, the CFR processing scheme, the processing result of the DPD, and the PA The information such as the processing result of the amplification, the BBU is difficult to restore the real signal of the PIM generated by the offset signal of the modeling calculation, and finally the PIM cannot be completely cancelled out.
- the RRU in the receiving channel of the RRU, after the signal received by the antenna is processed by the duplexer, the RRU is received by a low noise amplifier (LNA), an analog to digital converter (ADC), and an analog to digital converter (ADC).
- LNA low noise amplifier
- ADC analog to digital converter
- ADC analog to digital converter
- RF processing, digital down converter (DDC) processing, etc. obtain the baseband signal, and send it to the BBU for further processing.
- FIG. 3 is a flowchart of a PIM cancellation method according to an embodiment of the present application.
- the network device receives N backhaul information, where one of the backhaul information includes initial phase information of each carrier in a transmit channel, where N is an integer greater than or equal to 1.
- the backhaul information may be initial phase information of a carrier of each carrier in each transmission channel, for example, an initial phase value or information indicating an initial phase value.
- the indication information indicating the value of ⁇ 1 , ⁇ 2 , ⁇ 3 is sent to the network device as backhaul information, for example, several bits are used to indicate different initial phase value ranges, and when the initial phase value falls within a certain value When the range is within, the index value corresponding to the range is sent.
- the network device selects a specific value to use within the range.
- the backhaul information may be a backhaul signal, that is, one of the backhaul signals is a frequency-shifted single carrier signal in a transmit channel or a multi-carrier mixed signal that is multi-carrier combined.
- the above-mentioned backhaul signal includes initial phase information of each carrier because it is subjected to frequency shifting or multi-carrier combining.
- the RRU can send the above signal as a backhaul information to the network device.
- the backhaul signal may be subjected to other intermediate frequency and/or radio frequency signal processing after being subjected to frequency shifting or multi-carrier combining, which is not limited in this application.
- the foregoing backhaul information may be transmitted in sections according to an interface transmission specification or a system design requirement when transmitting through an interface of the BBU and the RRU.
- the backhaul information may also be interleaved.
- the network device may be a BBU or an RRU.
- the N backhaul informations correspond to N transmit channels, and the N transmit channels belong to at least one RRU.
- the network device removes the PIM of the received signal in its receive channel based on the N backhaul messages.
- the network device calculates PIM generated on the received signals of the N transmit channels in the receive channel according to the N backhaul information, that is, calculates the cancellation signal, and subtracts the cancellation signal from the received signal. , eliminate PIM.
- the radio frequency signal may be constructed according to the initial phase and the transmitted baseband signal, and used to calculate the cancellation signal. If the backhaul information received by the network device is a backhaul signal in step 301, the cancellation signal can be directly calculated from the backhaul signal.
- the specific calculation method is not limited in this application.
- FIG. 4 is a schematic diagram of implementation of a PIM elimination method according to an embodiment of the present application.
- PIM is performed by the BBU as a network device, and the BBU is connected to at least one RRU, and each RRU includes at least one transmitting channel and one receiving channel, and each transmitting channel and each receiving channel Channels can handle single carrier signals as well as multicarrier signals.
- an RRU includes one transmitting channel and one receiving channel as an example.
- one RRU includes more receiving channels and transmitting channels, other The manner of generating the return information of the transmitting channel and the receiving channel, the sending mode, the receiving mode, and the PIM eliminating mode are the same as those described in the embodiment, and are not described here.
- the structure of the BBU and the RRU and the processing of the signal refer to the description of the embodiment corresponding to FIG. 1 and FIG. 2, and details are not described herein again.
- each transmission channel in the RRU generates backhaul information of the channel.
- the backhaul information may be initial phase information of each carrier in the transmit channel.
- the backhaul information may be initial phase information of each carrier in the transmit channel.
- the initial phase information of each carrier is determined when the NCO generates a carrier, so the initial phase information of each carrier can be extracted from the NCO generation carrier process or the frequency shift processing process as the backhaul information.
- the backhaul information may be a backhaul signal, and the specific description may refer to the description in section 301.
- the backhaul signal may be a signal after being combined, and the single carrier signal after the combining process is subjected to frequency shift processing, and the multicarrier signal is subjected to frequency shifting and multicarrier signal superposition processing. , both contain the initial phase information of the carrier, so it can be used as a backhaul signal for PIM cancellation.
- the backhaul signal may also be a signal after combining and CFR processing.
- the backhaul signal also includes CFR clipping processing information, which can be used to achieve more accurate PIM cancellation. .
- the backhaul signal may also be a signal after processing by combining, CFR, and DPD. At this time, the backhaul signal further includes processing information of the DPD, which may be used to implement more accurate PIM cancellation.
- the return signal may also be a feedback signal after combining, CFR, DPD, digital-to-analog conversion, radio frequency processing, and PA amplification processing, and the feedback signal may be a feedback signal used for DPD processing, or may be used for other
- the feedback signal of the module, the return signal at this time is closer to the real signal generating PIM, so it can support more accurate PIM cancellation.
- One or more of the above optional backhaul signals may be selected by the return signal selection process. At least one is sent to the network device as a final return signal.
- the processing and sequence of the above-mentioned return signal may have other combinations, such as omitting the signal obtained in at least one of the steps; the processing steps that are passed are not limited to the processing described above, for example, in the above steps. Add other required processing, and this application does not limit this.
- the RRU can use any one of the signals generated in the above process as a backhaul signal while processing the transmitted signal.
- the initial phase information is returned in some channels
- the signal is returned in some channels, which is not limited in this application.
- the backhaul information is sent to the network device through the CPRI interface (the network device in this embodiment is the BBU).
- the implementation manner in which the RRU sends the backhaul information to the network device may be various. Taking the RRU as a return signal, the RRU may divide the backhaul signal into K-segment signals and send the K-segment signals to the network device.
- K is a positive integer, and the value of K can be determined according to actual conditions.
- the value of K can be equal to the ratio of the sampling rate of the returned signal that needs to be returned to the return rate.
- the rate is 122.88M
- the maximum rate of returning between the RRU and the BBU through the CPRI is 30.72M, then K can be determined to be 4.
- the RRU divides the backhaul signal into 4 segments in order of sequence.
- the specific length signal of 122.88M is composed of 40,000 sample points, which are s0, s1, s2, ..., s39999, after being divided into 4 segments, the first segment is : s0 ⁇ s9999; the second paragraph is: s10000 ⁇ s19999; the third paragraph is: s20000 ⁇ s29999; the fourth paragraph is: s30000 ⁇ s39999.
- the RRU sends back each segment of the signal to the network device.
- the network device receives each segment of the signal and then splices the four segments into a specific length signal of 122.88M.
- the RRU may interleave the backhaul signal into K-segment signals, and send the K-segment signals to the network device.
- the backhaul signal is a signal that has been combined in the RRU transmit channel.
- the RRU divides the backhaul signal into four segments.
- the 122.88M specific length signal is composed of 40,000 sample points, which are s0, s1, s2, ..., s39999, interleaved and divided into 4 segments, first.
- the segments are: s0, s4, s8, ..., s39996;
- the second segment is: s1, s5, s9, ..., s39997;
- the three segments are: s2, s6, s10, ..., s39998;
- the fourth segment is: s3, s9, s11, ..., s39999.
- the RRU sends back each segment of the signal to the BBU side. After receiving the signals, the BBU deinterleaves and combines each received signal into a 122.88M specific length signal.
- the backhaul information when the backhaul information is the initial phase information of the carrier, the backhaul may also be performed by using a segment transmission.
- the backhaul mode of the backhaul signal for a specific implementation manner, reference may be made to the segmented backhaul mode of the backhaul signal, and details are not described herein.
- the N backhaul information corresponding to the N transmit channels may be sent by the M RRUs to the network device, where M is less than or equal to N.
- the backhaul information of the transmit channel of the one or more RRUs may be forwarded by the at least one RRU to be sent to the network device.
- the RRU1 generates the backhaul information 1
- the backhaul information 1 is sent to the RRU2, and the RRU2 receives the backhaul information 1 and sends the backhaul information 1 to the network device.
- the RRU2 can also generate the generated channel in the own transmission channel.
- the backhaul information 2 is sent together with the backhaul information 1 to the network device.
- RRU1 By forwarding the backhaul information through other RRUs, more different network architectures can be supported for PIM cancellation, such as RRU1 that is not connected to the current network device, but the transmit signal of the RRU1 also generates PIM for the received signal of the current network device. Then, the RRU2 connected to the current network device can forward the backhaul information of the RRU1, thereby supporting the current network device to complete the PIM.
- the BBU receives N pieces of backhaul information, and performs PIM cancellation on the received signal in the receiving channel according to the N pieces of backhaul information to obtain a received signal in the receiving channel that is eliminated by the PIM.
- the N backhaul information is carrier initial phase information of N channels.
- the PIM cancellation process can be as follows:
- the return information is p11 ⁇ p1k 1 ,...,pN1 ⁇ pNk N, where p11 ⁇ p1k 1 is the initial phase value of carrier 1 to carrier k 1 in the first transmission channel, and k 1 is the first transmission channel.
- Number of carriers, number of N transmit channels.
- the specific carrier frequency of each of the transmission channels is f11 to f1k 1 , ..., fN1 to fNk N .
- the carrier frequency information may be predetermined or may be sent by the RRU to the BBU.
- the BBU reconstructs the combined signals x1 to xN in the N transmission channels according to the backhaul information, where
- X1 bb11 ⁇ duc(f11,p11)+...+bb1k 1 ⁇ duc(f1k 1 ,p1k 1 ),
- xN bbN1 ⁇ duc(fN1,pN1)+...+bbNk N ⁇ duc(fNk N ,pNk N ),
- bb11 ⁇ bb1k 1 ,..., bbN1 ⁇ bbNk N are the baseband signals transmitted by the BBU to the RRU, and duc(f,p) represents the digital frequency conversion of the carrier frequency point f and the carrier initial phase being p
- the BBU obtains the mixing coefficients c1 to cN of the standard intermodulation signal by using a least mean square algorithm (LMS) or a least squares algorithm (Least Square, LS);
- LMS least mean square algorithm
- LS least squares algorithm
- rxout rxin-c1 ⁇ imd1-...-cN ⁇ imdN, where rxin is the received signal before PIM cancellation in the receiving channel.
- the N backhaul information is a backhaul signal.
- the PIM elimination process can be as follows:
- the BBU shifts the N return signals A 1 , . . . , A N according to the relative positions of the carrier frequencies of the transmitting channel and the receiving channel, and moves A 1 , . . . , A N to the corresponding position of the receiving channel carrier frequency. , get A' 1 ,...,A' N ;
- rxout rxin-c1 ⁇ imd1-...-cN ⁇ imdN, where rxin is the received signal before the PIM cancellation in the receiving channel.
- FIG. 6 is a schematic diagram of another implementation of a PIM cancellation method according to an embodiment of the present application.
- PIM cancellation is performed by the RRU as a network device.
- Each RRU independently performs PIM cancellation on the received signal in its own receiving channel.
- the following takes an example of PIM cancellation of an RRU as an example.
- the PIM elimination processing of other RRUs is the same.
- a BBU and three RRUs connected thereto are taken as an example.
- one BBU can be connected to more RRUs, and other RRUs are applied in the manner and description of the embodiments of the present application. RRU is consistent.
- RRU1 R RRU3 respectively generate backhaul information of the respective transmit channels.
- RRU1 R RRU3 respectively generate backhaul information of the respective transmit channels.
- the RRU performing PIM cancellation also needs to acquire signal information processed by other RRUs to reconstruct a radio frequency signal used to generate the cancellation signal.
- the following uses the backhaul signal as the backhaul information as an example for description.
- RRU1 receives the backhaul information of RRU2 and RRU3.
- RRU2 and RRU3 may directly send the respective backhaul signals to the RRU1, or may be sent by forwarding.
- RRU3 sends its own backhaul signal to RRU2, which then sends its own backhaul signal and RRU3's backhaul signal to RRU1.
- the forwarding manner of the backhaul information can simplify the connection relationship between multiple RRUs and simplify the network structure.
- the specific manner of sending back signals refer to the embodiment corresponding to FIG. 3 to FIG. 5, except that in this embodiment, the backhaul signal of the RRU is sent to other RRUs for PIM cancellation, and details are not described herein again.
- the processing of the segmentation and/or interleaving of the backhaul signals in the embodiments corresponding to FIG. 3 to FIG. 5 can still be used, and details are not described herein again.
- RRU1 Based on the received backhaul information of RRU2 and RR3 and the backhaul information of the own transmission channel, RRU1 performs PIM cancellation on the received signal in its own receiving channel.
- PIM elimination mode refer to the related description in the embodiment corresponding to FIG. 3 to FIG. 5, and details are not described herein again.
- FIG. 7 is a schematic diagram of another implementation of a PIM elimination method according to an embodiment of the present application.
- PIM cancellation is performed by the RRU as a network device.
- the RRU sends the generated backhaul information to the BBU, and then the BBU sends all the backhaul information to each RRU that needs to be PIM-removed.
- the existing interface between the RRU and the BBU is used to prevent the transmission of the backhaul information between the RRUs.
- the backhaul information in the embodiment corresponding to FIG. 3 to FIG. 5 may be used.
- the processing of segmentation and/or interleaving will not be repeated here.
- the BRU may include the backhaul information of the RRU itself or only the backhaul information of other RRUs.
- the RRU1 needs the N backhaul information including its own backhaul information to perform PIM cancellation.
- the BBU may send the N backhaul information to the RRU1.
- the Nm backhaul information that does not include the backhaul information of the RRU1 itself is sent to the RRU1, where m represents the number of backhaul information generated by the RRU1 itself.
- the BBU may also select whether to send the backhaul information forwarded by the RRU1 to the RRU1.
- RRU1 the numbers of the RRUs in the present application, such as "RRU1", “RRU2” and the like, are only for clarity of description and are not limiting.
- the PIM in the receiving channel of the BBU or the RRU may be eliminated by using the method provided in this embodiment of the present application.
- the backhaul information can be transmitted through the forwarding provided in the foregoing embodiment.
- the data transmission method provided by the embodiment of the present application is introduced from the perspective of the interaction between the network elements and the network elements.
- Each network element such as a BBU, RRU, etc.
- Each network element includes hardware structures and/or software modules corresponding to the execution of the respective functions.
- Those skilled in the art will readily recognize that, in conjunction with the disclosure disclosed herein
- the elements and algorithm steps of the various examples described in the embodiments can be implemented in a combination of hardware or hardware and computer software. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
- FIG. 8 is a schematic diagram showing a possible structure of a network device involved in the embodiment of the present application.
- the data sending device may be a BBU, an RRU, or a device composed of a chip and/or various discrete devices.
- the structure of the network device includes a receiver and a processor.
- the network device can also include a memory.
- the network device may also include a communication unit for communicating with other network devices.
- the structure of the network device involved in the present application includes a receiver 801, a processor 802, and a memory 803. The receiver is used for the backhaul information involved in the foregoing embodiment, and the processor is configured to perform PIM cancellation according to the backhaul information and complete other processing procedures involved in the network device in the embodiment corresponding to FIG. 3 to FIG. 7 above.
- FIG. 9 is a schematic diagram showing a possible structure of an RRU involved in the embodiment of the present application.
- the structure of the RRU includes a processor and a transmitter. In one embodiment, the RRU may also include a receiver. In a specific embodiment, the structure of the RRU may also include a memory. In a specific embodiment, the structure of the RRU may further include a wireless signal transmitter and a wireless signal receiver. In the embodiment corresponding to FIG. 9, the RRU structure includes a receiver 901, a transmitter 902, a processor 903, a wireless signal transmitter 904, and a wireless signal receiver 905. The receiver 901 is configured to support the RRU to receive information or instructions sent by other RRUs or BBUs, for example, receiving a baseband signal sent by the BBU, and/or receiving the backhaul information when PIM cancellation is required.
- the transmitter 902 is configured to support the RRU to send the required information or instructions to the BBU or other RRU, for example, to send the processed wireless received signal, and/or send its own backhaul information to the BBU or other RRU.
- the processor 903 is configured to support the RRU to perform any one or more of the RRU behaviors in the foregoing embodiments corresponding to FIG. 3 to FIG. 7, for example, generating backhaul information and/or performing PIM cancellation.
- the wireless signal transmitter 904 and the wireless signal receiver 905 are configured to support the RRU to perform transmission and reception processing on the wireless signals transmitted and received through the air interface.
- the wireless signal transmitter can perform related processing of the radio frequency signals, power amplification, and the like.
- the processing may also be performed in a processor, which is not limited in this application.
- FIG. 9 only shows a simplified design of the RRU.
- the RRU may also include any number of transmitters, receivers, processors, memories, wireless signal transmitters, wireless signal receivers, etc., and all RRUs that can implement the present application are within the scope of the present application.
- FIG. 10 is a schematic diagram showing a possible structure of a BBU according to an embodiment of the present application.
- the structure of the BBU includes a receiver and a transmitter.
- the BBU may also include a processor.
- the BBU may also include a memory.
- the BBU may further include a communication unit for communicating with other BBUs.
- the BBU includes a transmitter 1001, a receiver 1002, a processor 1003, and a memory 1004.
- the transmitter 1001 is configured to support the BBU to send a signal or an instruction required in the embodiment of the present application to the RRU, for example, sending back information or sending data that needs to be sent by other CPRI ports.
- the receiver 1002 is configured to support the BBU to receive signals or instructions required by the embodiment of the present application, for example, to receive backhaul information.
- the processor 1003 is configured to support the BBU to perform the processing procedures involved in the BBU in the foregoing embodiments of FIG. 3 to FIG. 7, such as one or more functions of baseband signal processing, PIM cancellation, and receiving and forwarding of control backhaul information.
- the memory 1004 is configured to be coupled to the processor to save program instructions and data necessary for the BBU.
- FIG. 11 is a schematic diagram showing a possible structure of a base station involved in an embodiment of the present application.
- the base station includes a BBU and at least one RRU connected to the BBU. In an embodiment, the base station may also include more BBUs and RRUs. In the embodiment corresponding to FIG. 11, the base station includes a BBU 1102 and a plurality of RRUs 1101 connected to the BBU 1102.
- the BBU 1102 can support the functions of the BBU in the embodiments corresponding to the foregoing FIG. 3 to FIG. 7
- the RRU 1101 can support the functions of the RRU in the embodiments corresponding to the foregoing FIG. 3 to FIG. 7 .
- embodiments of the present application can be provided as a method, system, or computer program product.
- the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
- the application can be employed in one or more A computer program product embodied on a computer usable storage channel (including but not limited to disk storage and optical storage, etc.) containing computer usable program code.
- the present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
- the computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine instruction for generating instructions executed by a processor of a computer or other programmable data processing device Means for implementing the functions specified in one or more flows of the flowchart or in a block or blocks of the flowchart.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
一种无源互调消除方法、装置及基站,包括:网络设备接收N个回传信息,一个所述回传信息包含一个发射通道中的各个载波的初始相位信息,其中N为大于等于1的整数;所述网络设备根据所述N个回传信息消除所述网络设备的接收通道中的接收信号的PIM。
Description
本申请涉及通信技术领域,尤其涉及一种无源互调(PassiveInter Modulation,PIM)消除方法、装置及基站。
在无线通信系统中,网络设备中的PIM是由下行链路的发射信号直接或间接通过无源器件产生的互调信号,PIM如果刚好落在上行链路(uplink)的接收信号频段内,就会影响接收信号的质量。为了降低PIM的影响,通常会在基带处理单元(Base band Unit,BBU)或射频拉远单元(Radio Remote Unit,RRU)内采用PIM消除技术来提高接收信号的质量。
现有PIM消除技术在进行PIM消除时,BBU基于将要发送给RRU的基带信号对RRU发射通道中的信号进行建模,获得用于抵消PIM的抵消信号,然后将所述抵消信号叠加在BBU的接收通道中,从而实现消除由于RRU的发射信号产生的PIM。
然而,上述方法中,抵消信号是根据将要BBU发送给RRU的基带信号进行建模获得,无法精确还原RRU侧的发射信号,因此BBU建模后获得的抵消信号并不能完全将PIM消除,从而使得上行链路的接收信号中依然存在干扰。
发明内容
本申请实施例提供一种无源互调消除方法、装置及基站,用以提供一种消除PIM的方案,减少PIM对上行链路的接收信号的干扰,从而提高接收信号的质量。
第一方面,本申请提供一种无源互调消除方法,包括:网络设备获取N个回传信息,一个所述回传信息包含一个发射通道中的各个载波的初始相位
信息,其中N为大于等于1的整数;所述网络设备根据所述N个回传信息消除所述网络设备的接收通道中的接收信号的PIM。可选的,所述N个发射通道,为M个RRU的发射通道,其中,M大于等于1且小于等于N。每个RRU中可以包含至少一个所述发射通道。可选的,所述网络设备可以为BBU或RRU,也可以是其他进行PIM处理的网络设备,本申请对此不做限定。其中,所述载波的初始相位,是指待处理的发射信号在移频处理过程中所使用的载波初始相位。所述载波初始相位信息在待发射信号进行移频之前是无法获知的,在不知道载波初始相位信息时对发射信号进行建模并以此进行PIM消除也是不准确的,此外,不同的RRU之间也无法获知对方的载波初始相位信息处理信息,所以,接收上述回传信息并根据所述回传信息进行PIM消除,可以更精确的获得消除PIM的抵消信号,从而提升PIM消除性能,进而提升整个系统接收信号的质量。进一步的,网络设备接收来自多个RRU的回传信息,可以实现多RRU系统中的PIM消除性能,进而提升整个系统接收信号的质量。
结合第一方面,在第一方面的第一种可能的实现方式中,所述回传信息可以是各个载波的初始相位信息,例如,初始相位取值或者可以指示初始相位取值的指示信息。直接发送初始相位信息,可以减少回传信息的数据量,节省传输带宽。
结合第一方面,在第一方面的第二种可能的实现方式中,网络设备接收N个回传信号,所述N个回传信号分别为N个发射通道中经过移频的单载波信号或经过多载波合路的多载波混合信号,其中N为大于等于1的整数;所述网络设备根据所述N个回传信号消除所述网络设备的接收通道中的接收信号的PIM。其中,所述移频,是指根据当前所处理的待发射信号在整个频段所处的频率相对位置,将其搬移到相应的载波位置。所述多载波合路,是指将多个不同载波位置上的待发射信号进行时域叠加,获得多载波混合信号,其中,上述多个不同载波位置上的待发射信号中可以所有的待发射信号都经过移频处理,也可以有至少一个待发射信号未经过移频而其他信号经过移频处理。网络设备获取了经过移频的单载波信号或者经过多载波合路的多载波混
合信号,就获得了包含载波初始相位信息的信号,而所述载波初始相位信息是无法通过建模获知的,不同的RRU之间也无法获知对方的载波初始相位信息处理信息,所以,接收上述回传信号并根据所述回传信号进行PIM消除,可以更精确的获得消除PIM的抵消信号,从而提升PIM消除性能,进而提升整个系统接收信号的质量。进一步的,网络设备接收来自多个RRU的回传信号,可以实现多RRU系统中的PIM消除性能,进而提升整个系统接收信号的质量。
结合第一方面或上述第一方面的任一种可能的实现方式,在第一方面的第三种可能的实现方式中,所述回传信号除了经过移频处理或者经过多载波合路处理之外,还可以经过波峰因数降低(Crest Factor Reduction,CFR)处理。经过CFR处理的信号,包含了信号幅度变化信息(例如,峰值压缩的程度),而所述信号幅度变化信息同样无法通过建模来获知,不同的RRU之间也无法获知对方的CFR处理信息,所以获取经过CFR处理的回传信号,可以进一步提升PIM消除的准确性。
结合第一方面或上述第一方面的任一种可能的实现方式,在第一方面的第四种可能的实现方式中,所述回传信号还可以经过数字预失真(Digital Pre-Distortion,DPD)处理。经过DPD处理的信号作为回传信号,包含了更多了信号幅度和/或相位的变化信息(例如,对信号进行预失真处理时的幅度和/或相位变化信息),可以进一步提升PIM消除的准确性。
结合第一方面或上述第一方面的任一种可能的实现方式,在第一方面的第五种可能的实现方式中,所述回传信号还可以是经过射频功率放大器(Power Amplifier,PA,中文简称功放)放大后的反馈信号。其中,所述反馈信号可以是用于DPD处理的反馈信号,也可以是其他用途的反馈信号,本申请对此不做限定。经过PA放大后的信号,更接近产生PIM的真实信号,因此可以获得更好的PIM消除效果。
所述回传信号在上述处理过程之间或者前后,还可以经过其他中射频链路所需的处理过程,本申请对此不做限定。
结合第一方面或上述第一方面的任一种可能的实现方式,在第一方面的第六种可能的实现方式中,所述网络设备为BBU,所述方法还包括:与所述网络设备连接的M个RRU向所述网络设备发送所述N个回传信息,其中M为大于等于1小于等于N的整数。
结合第一方面或上述第一方面的第一至第五种任一可能的实现方式,在第一方面的第七种可能的实现方式中,所述网络设备为RRU,所述方法还包括:除所述网络设备之外的其他M个RRU向所述网络设备发送所述N个回传信息,其中M为大于等于1小于等于N的整数。可选的,所述M个RRU与所述网络设备连接同一个BBU。
结合第一方面或上述第一方面的第一至第五种任一可能的实现方式,在第一方面的第八种可能的实现方式中,所述网络设备为RRU,所述方法还包括:所述网络设备所连接的BBU接收M个RRU发送的所述N个回传信息,其中M为大于等于1小于等于N的整数;所述BBU将所述N个回传信息发送给所述网络设备。
结合上述第一方面第六种至第八种可能的实现方式,可选的,所述M个RRU中的任一个RRU都可以包含至少一个发射通道,即任一个RRU都可以发送至少一个回传信息。可选的,所述M个RRU中的任一个RRU还可以转发其他RRU的至少一个回传信息给所述网络设备,以便所述网络设备用于PIM消除,例如,M个RRU中的某一个或者几个RRU可以接收其他RRU发送的回传信息,然后将接收到的其他RRU的回传信息和自己的回传信息发送给所述网络设备。
结合上述第一方面第六种至第八种可能的实现方式,在第一方面的第九种可能的实现方式中,所述RRU向所述网络设备发送所述回传信息,具体包括:所述RRU可以将一个回传信息划分为K段信号,并将所述K段信号分别发送给所述网络设备,其中K为大于等于1的整数。可选的,在划分所述回传信息之前,还可以对所述回传信息进行交织。将回传信息进行分段发送,可以动态的适配RRU和网络设备之间的接口速率,保证所述回传信息得以传
输。
第二方面,本申请提供了一种网络设备,该网络设备具有实现上述第一方面所提供的方法实际中网络设备行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多于一个与上述功能相对应的模块。可选的,该网络设备可以是一种BBU,也可以是一种RRU。
第三方面,本申请提供了一种RRU,该RRU具有实现上述第一方面所提供的方法实际中任何一种或多种RRU行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多于一个与上述功能相对应的模块。
第四方面,本申请提供了一种BBU,该BBU具有实现上述第一方面所提供的方法实际中BBU行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多于一个与上述功能相对应的模块。
第五方面,本申请提供了一种网络设备,网络设备的结构中包括接收器和处理器。所述接收器用于支持网络设备接收上述第一方面方法中所涉及的信息,所述处理器被配置为支持网络设备执行上述第一方面方法中相应的功能,例如根据回传信息进行PIM消除。在一个可能的设计中,所述网络设备还可以包括通信单元,所述通信单元用于支持网络设备与其他网络设备进行通信,例如接收其他网络设备所发送的信息或指令,和/或发送信息或指令给其他网络设备。在一个可能的设计中,所述网络设备的结构中还可以包括存储器,所述存储器用于与处理器耦合,保存网络设备必要的程序指令和数据。
第六方面,本申请提供一种RRU,RRU的结构中包括处理器和发射器。所述处理器被配置为支持RRU执行上述第一方面方法中任何一种或多种RRU行为,例如,用于对至少一个发射通道中的信号进行处理,以便获得至少一个回传信息。所述发射器用于支持RRU发送上述第一方面方法中所涉及的信息,例如发送至少一个回传信息。在一个可能的设计中,所述RRU还可
以包括接收器,用于支持RRU接收上述第一方面方法中所涉及的信息。可选的,所述RRU的处理器和接收器,还可以同时被配置为支持RRU执行上述第一方面方法中网络设备相应的功能。在一个可能的设计中,所述RRU的结构中还可以包括存储器,所述存储器用于与处理器耦合,保存RRU必要的程序指令和数据。
第七方面,本申请提供一种BBU,BBU的结构中包括接收器和发射器。所述接收器用于支持BBU接收上述第一方面方法中所涉及的信息。所述发射器用于支持BBU发送上述第一方面方法中所涉及的信息。可选的,所述BBU还可以包含处理器,所述处理器用于支持或控制BBU完成上述第一方面方法中所涉及的收发信号操作。可选的,所述处理器和接收器,还可以同时被配置为支持BBU执行上述第一方面方法中网络设备相应的功能。在一个可能的设计中,所述BBU的结构中还可以包括存储器,所述存储器用于与处理器耦合,保存BBU必要的程序指令和数据。
第八方面,本申请提供一种基站,所述基站包括第五方面所述的网络设备和至少一个第六方面所述的RRU。在一种可能的设计中,所述基站还可以包括第七方面所述的BBU。
第九方面,本申请提供了一种计算机存储介质,用于储存为上述网络设备所用的计算机软件指令,其包含用于执行上述方面所设计的程序。
第十方面,本申请提供了一种计算机存储介质,用于储存为上述RRU所用的计算机软件指令,其包含用于执行上述方面所设计的程序。
第十一方面,本申请提供了一种计算机存储介质,用于储存为上述BBU所用的计算机软件指令,其包含用于执行上述方面所设计的程序。
图1为本申请实施例提供的一种基站信号处理示意图;
图2为本申请实施例提供的一种合路处理示意图;
图3为本申请实施例提供的一种无源互调消除方法流程示意图;
图4为本申请实施例提供的一种无源互调消除方法实现示意图;
图5为本申请实施例提供的一种回传信号处理示意图;
图6为本申请实施例提供的另一种无源互调消除方法实现示意图;
图7为本申请实施例提供的又一种无源互调消除方法实现示意图;
图8为本申请实施例提供的一种网络设备结构示意图;
图9为本申请实施例提供的一种RRU结构示意图;
图10为本申请实施例提供的一种BBU结构示意图;
图11为本申请实施例提供的一种基站结构示意图。
下面结合说明书附图对本申请实施例做详细描述。
本申请实施例可以应用于长期演进(Long Term Evolution,LTE)系统以及后续的演进系统如5G(the 5th Generation mobile communication,第五代移动通信)等、通用移动通信系统(Universal Mobile Telecommunications System,UMTS)、全球移动通信系统(Global System for Mobile Communication,GSM)等制式的无线通信系统,也可以应用于其他需要实现PIM消除的通信系统。本申请中,名词“网络”和“系统”经常交替使用,但本领域的技术人员可以理解其含义。下面首先对本申请中所涉及的术语作出解释。
本申请中的基站,可以包括各种形式的宏基站、微基站、中继站、接入点或RRU等,当然,与用户设备进行无线通信的也可以是其他具有无线通信功能的网络设备,本申请对此不做唯一限定。在采用不同系统中,具备基站功能的设备的名称可能会有所不同,例如在LTE网络中,称为演进的节点B(evolved NodeB,eNB或eNodeB),在3G(the 3rd Generation,第三代)网络中,称为节点B(Node B)等。
本申请中的接收通道或发射通道是指基站中用于接收或发射无线信号并对接收到或待发送的无线信号进行处理的通道。所述接收通道包括BBU和RRU中的接收通道,发射通道包括BBU和RRU中的发射通道。通常情况下,
在RRU中,接收通道或发射通道与用于接收或发射无线信号的天线一一对应,一个RRU中可以包含至少一个发射通道和至少一个接收通道,但本申请对此不做限定。
本申请中的载波(也可以称为载频),是指具有特定频率和一定带宽(例如,10M)的无线电波,用于承载待传输的无线信号。频段,是指无线通信中所使用的一部分频谱资源,例如LTE系统中所使用的1800M频段。通常情况下,一个频段中包含多个载波,例如,1800M频段的带宽为75M,则该频段中可能包含m(m≥)个20M带宽的载波和n(n≥)个10M带宽的载波,当然还有其他可能的载波划分方式,本申请对此不做限定。在本申请中,一个接收通道或发射通道,可以处理包含至少一个载波的信号。
本申请所提供的方案通常应用于无线通信系统中的基站,也可以应用于其他需要实现PIM消除的设备或装置。现有无线通信系统中的基站通常包括一个BBU以及与所述BBU连接的至少一个RRU,也可以包含更多的BBU及与其连接RRU,本申请不做限定。以基站中包含一个BBU及多个RRU为例,图1为一种可能的基站中RRU与BBU的连接示意图。图1中一个BBU101与多个RRU102通过通用公共无线电接口(Common Public Radio Interface,CPRI)连接。当然,RRU与BBU也可以通过其他类型的接口连接,在此不再赘述。图1中的BBU101和RRU102为本申请实施例所涉及的BBU和RRU的信号处理流程。
RRU中的一个发射通道对BBU发送的该通道上的基带信号进行CPRI接口处理(例如解帧)、中频处理、射频处理等,最终将经过处理的射频信号送至天线进行发送。由天线接收的无线信号,也会在RRU经过射频处理、中频处理等变换为基带信号并通过CPRI口发送给BBU进行基带处理。需要说明的是,图1中的RRU102中仅示出了一个发射通道和一个接收通道,实际中RRU可能包含至少一个发射通道和至少一个接收通道,本申请对此不做限定。
在发射通道,RRU首先对基带信号进行合路处理,结合图2所示的合路处理具体流程,对基带信号进行合路处理的过程可以包括上采样、移频、多
载波信号叠加等过程。具体的,当RRU所处理的信号为单载波信号时,RRU对基带信号进行上采样和移频处理,特别的,当前所处理的单载波信号也可能不经过移频处理,例如所时候的载波刚好处在其所在频段的中间位置时,便无需对信号进行移频处理。例如,在一个带宽为75M的频段中,通常用-37.5M~+37.5M来描述整个频段的相对位置,如果RRU处理的信号是一个10M带宽的单载波信号,且当前信号所使用的载波在75M带宽中的相对位置是27.5M~37.5M,则需要对该信号进行移频,如果当前信号所使用的载波在75M带宽中的相对位置是-5M~+5M,则不需要对该信号进行移频。当RRU所处理的信号为多载波信号时,RRU对信号进行上采样,之后根据多个信号所处的不同载波位置,对多个信号进行移频,再将经过移频的多个信号进行时域叠加,即实现多载波合路,获得多载波混合信号。特别的,所述多载波信号中也可能存在不需要移频的信号,具体情况与不需要进行移频的单载波信号相同,不再赘述。其中,在移频过程中需要根据数字控制振荡器(numerically controlled oscillator,NCO)确定载波信号的初始相位。
合路后,RRU对信号进行波峰因数降低(Crest Factor Reduction,CFR)处理,CFR处理后信号的峰值会被压缩,采用的CFR处理方案不同,压缩后的信号也不同。
经过CFR处理后的信号,RRU会进一步对其进行数字预失真(Digital Pre-Distortion,DPD)处理,DPD处理会动态的调整信号的幅值和相位等特征,以便减小发射信号的失真。
经过DPD处理后的信号,会通过数模转换器(Digital-to-Analog Conversion,DAC)转换成模拟信号,并通过发送射频处理搬移到射频,然后经过功率放大器(Power Amplifier,PA,简称功放)放大,在双工器处理之后通过天线发送。其中,信号经过PA放大之后,反馈通道会根据PA后信号,产生用于DPD或者用于前端其他模块的反馈信号。
由于PIM通常是发射信号在经过双工器、塔放或天馈等无源器件产生的互调信号,所以在PIM消除时用来计算抵消信号所使用的信号,越接近产生
PIM的处理位置,PIM消除的效果越好。现有技术中,在BBU基于基带信号对产生PIM的射频信号进行建模,并使用建模生成的信号计算抵消信号,由于无法获知载波信号的初始相位,CFR处理方案,DPD的处理结果、PA放大的处理结果等信息,BBU通过建模计算的抵消信号很难还原产生PIM的真实信号,导致最终不能完全抵消PIM。
相应的,在RRU的接收通道中,经天线接收的信号由双工器处理后,RRU对经低噪声放大器(Low Noise Amplifier,LNA),模数转换器(Analog to digital converter,ADC),接收射频处理,数字下变频器(Digital Down Converter,DDC)等处理,获得基带信号,并将其发送给BBU进一步处理。
需要说明的是,图1和图2所示的BBU以及RRU的信号处理过程及内部结构只是一种举例,以帮助理解,并不用于限制本申请,实际网络中的BBU和RRU连接架构、内部结构以及对信号的处理过程还可以采用其它的设计方式,在此不再赘述。
图3为本申请实施例提供的一种PIM消除方法的流程图。
在301部分,网络设备接收N个回传信息,其中一个回传信息中包含一个发射通道中的各个载波的初始相位信息,N为大于等于1的整数。
在一个实施例中,所述回传信息,可以是每个发射通道中的各载波的载波的初始相位信息,例如,初始相位值或者指示初始相位值的信息。例如,一个发射通道中处理的信号是一个包含3个载波的多载波信号,在对3个信号进行移频过程中确定了3个载波的初始相位分别为φ1,φ2,φ3例如,φ1=π/2,φ2=3π/4,φ3=π/6,则RRU可以直接将φ1,φ2,φ3的取值作为回传信息发送给网络设备,也可以将可以指示φ1,φ2,φ3取值的指示信息作为回传信息发送给网络设备,例如,采用几个比特来表示不同的初始相位取值范围,当初始相位取值落入某个取值范围内时,就发送该范围对应的索引值,具体的,如用“00”表示初始相位取值为0~π/3,则当初始相位取值为π/6时,便可以发送“00”指示当前的初始相位取值范围,网络设备在该范围内选取某一个具体的值使用。
在另一个实施例中,所述回传信息可以是回传信号,即,一个所述回传信号为一个发射通道中经过移频的单载波信号或经过多载波合路的多载波混合信号。上述回传信号因为经过移频或多载波合路,所以包含各个载波的初始相位信息。RRU可以将上述信号作为回传信息发送给网络设备。可选的,上述回传信号在经过移频或多载波合路之后,还可以经过其他中频和/或射频信号处理过程,本申请对此不做限定。
可选的,上述回传信息,在经过BBU和RRU的接口进行传输的时候,还可以根据接口传输规范或者系统设计需要,进行分段传输。可选的,还可以对所述回传信息进行交织处理。
可选的,所述网络设备可以是BBU,也可以是RRU。
可选的,所述N个回传信息对应N个发射通道,所述N个发射通道属于至少一个RRU。
在302部分,网络设备根据所述N个回传信息消除其接收通道中的接收信号的PIM。
在一个实施例中,网络设备根据N个回传信息计算出N个发射通道在接收通道中的接收信号上产生的PIM,即,计算出抵消信号,并在接收信号中减掉所述抵消信号,消除PIM。
具体的,如果网络设备接收到的回传信息是301步骤中的各个载波的初始相位取值信息,则可以根据初始相位以及发送的基带信号构建出射频信号,用于计算抵消信号。如果网络设备接收到的回传信息是301步骤中的回传信号,则可以直接根据回传信号计算抵消信号。具体计算方式本申请不做限定。
图4为本申请实施例提供的一种PIM消除方法的实现示意图。
在图4所示的PIM消除方法中,由BBU作为网络设备进行PIM消除,所述BBU连接至少一个RRU,每个RRU中至少包含一个发射通道和一个接收通道,每个发射通道和每个接收通道可以处理单载波信号也可以处理多载波信号。为了说明清晰,本申请实施例中均以一个RRU包含一个发射通道和一个接收通道为例,当一个RRU中包含更多的接收通道和发射通道时,其他
发射通道和接收通道的回传信息的生成方式、发送方式、接收方式以及PIM消除方式等与实施例中所述的实现方式一致,后续不再赘述。BBU和RRU的架构及对信号的处理方式可以参考图1和图2所对应的实施例描述,此处不再赘述。
在图4所示的PIM消除方法中,RRU中的每个发射通道生成该通道的回传信息。
在一个实施例中,所述回传信息可以是该发射通道中各个载波的初始相位信息。具体可以参考301部分的描述,此处不再赘述。
结合图2所对应的实施例描述,各个载波的初始相位信息在NCO生成载波时确定,所以可以从NCO生成载波过程中或者移频处理过程中提取各个载波的初始相位信息作为回传信息。
在另一个实施例中,所述回传信息可以是回传信号,具体描述可以参考301部分的描述。
具体的,结合图5,所述回传信号可以是经过合路处理之后的信号,经过合路处理之后的单载波信号经过了移频处理、多载波信号经过了移频和多载波信号叠加处理,都包含了载波的初始相位信息,因此可以作为回传信号用于PIM消除。
所述回传信号还可以是经过合路和CFR处理之后的信号,此时回传信号除了包含载波的初始相位信息,还包含了CFR的削波处理信息,可以用于实现更准确的PIM消除。
所述回传信号还可以是经过合路、CFR、DPD处理之后的信号,此时回传信号又包含了DPD的处理信息,可以用于实现更准确的PIM消除。
所述回传信号还可以是经过合路、CFR、DPD、数模转换以及射频处理、PA放大处理之后的反馈信号,该反馈信号可以是用于DPD处理的反馈信号,也可以是用于其他模块的反馈信号,此时的回传信号更接近产生PIM的真实信号,因此可以支持更加准确的PIM消除。
上述一种或者多种可选的回传信号可以经过回传信号选择处理最终选择
出至少一个,作为最终的回传信号发送给网络设备。
当然,上述回传信号所经过的处理过程和顺序,还可以有其他的组合,例如省略其中的至少一步获得的信号;所经过的处理步骤也不限于上述所述的处理,例如,在上述步骤中增加其他需要的处理,本申请对此不做限制。RRU在对发射信号进行处理的同时,可以将上述处理过程中产生的任意一种信号作为回传信号。
需要说明的是,上述回传信息的不同类型还可以混合使用,例如某些通道中回传初始相位信息,某些通道中回传信号,本申请对此不做限定。
RRU生成上述回传信息后,将回传信息通过CPRI接口发送给网络设备(本实施例中网络设备为BBU)。
RRU将所述回传信息发送给网络设备的实现方式可以有多种。以RRU发送回传信号为例,RRU可以将回传信号划分为K段信号,并将所述K段信号分别发送给所述网络设备。K为正整数,K的取值可以根据实际情况确定,举例来说,K的取值可以等于需要回传的回传信号的采样率与回传速率的比值,具体的,回传信号的采样率为122.88M,RRU与BBU之间通过CPRI回传的最大速率为30.72M,则K可以确定为4。RRU将回传信号按先后顺序划分成4段,例如:122.88M的特定长度信号由40000个采样点组成,分别为s0,s1,s2……,s39999,划分成4段之后,第一段为:s0~s9999;第二段为:s10000~s19999;第三段为:s20000~s29999;第四段为:s30000~s39999。RRU分别将每段信号回传给网络设备,网络设备收到各段信号再将4段信号拼接成122.88M的特定长度信号。
一种可能的实施例中,RRU可以将回传信号进行交织后划分为K段信号,并将所述K段信号分别发送给所述网络设备。
举例来说,回传信号为在RRU发射通道中经过合路处理后的信号。RRU将回传信号进行交织后划分成4段,例如:122.88M的特定长度信号由40000个采样点组成,分别为s0,s1,s2……,s39999,交织并划分成4段之后,第一段为:s0,s4,s8,…,s39996;第二段为:s1,s5,s9,…,s39997;第
三段为:s2,s6,s10,…,s39998;第四段为:s3,s9,s11,…,s39999。RRU分别将每段信号回传到BBU侧,BBU收到各段信号后,再将收到的每段信号解交织并拼接成122.88M的特定长度信号。
可选的,当所述回传信息为载波的初始相位信息时,也可以采用分段传输的方式进行回传。具体实施方式可以参照回传信号的分段回传方式,不再赘述。
可选的,上述N个发射通道所对应的N个回传信息,可以由M个RRU发送给网络设备,M小于等于N。其中,某一个或者多个RRU的发射通道的回传信息可以经过其他至少一个RRU的转发,从而发送给网络设备。例如,RRU1生成回传信息1后,将回传信息1发送给RRU2,RRU2接收回传信息1并将回传信息1发送给网络设备,可选的,RRU2还可以将自己发射通道中生成的回传信息2和回传信息1一同发送给网络设备。通过其他RRU转发回传信息,可以支持更多不同的网络架构进行PIM消除,例如某个不与当前网络设备相连接的RRU1,但该RRU1的发射信号也会对当前网络设备的接收信号产生PIM,则可以通过其他与当前网络设备相连接的RRU2转发该RRU1的回传信息,从而支持当前网络设备完成PIM。
BBU接收N个回传信息,并根据N个回传信息对其接收通道中的接收信号进行PIM消除,获得经过PIM消除的接收通道中的接收信号。
在一个实施例中,所述N个回传信息为N个通道的载波初始相位信息。举例来说,当N个回传信息为初始相位值时,PIM消除过程可以如下:
1)回传信息为p11~p1k1,…,pN1~pNkN其中p11~p1k1为第1个发射通道中载波1~载波k1的初始相位值,k1为第1个发射通道中的载波个数,N个发射通道个数。每个发射通道中具体的载波频点为f11~f1k1,…,fN1~fNkN,可选的,所述载波频点信息可以是预先确定的,也可以是RRU发送给BBU的。BBU根据回传信息重构N个发射通道中合路后信号x1~xN,其中,
x1=bb11×duc(f11,p11)+…+bb1k1×duc(f1k1,p1k1),
…
xN=bbN1×duc(fN1,pN1)+…+bbNkN×duc(fNkN,pNkN),
其中bb11~bb1k1,…,bbN1~bbNkN为BBU传给RRU的基带信号,duc(f,p)表示载波频点为f,载波初始相位为p的数字变频
2)将所述x1~xN分别根据发射通道和接收通道的载频相对位置进行移频,将x1~xN搬移到接收通道载频的对应位置,得到x’ 1~x’ N;
3)BBU根据x’ 1~x’ N生成理想互调信号imd1~imdN,其中,imd1=x’ 1×x’ 1×conj(x’ 1),…,imdN=x’ N×x’ N×conj(x’ N)其中conj表示取共轭;
4)BBU利用最小均方算法(Least Mean Square,LMS)或最小二乘算法(Least Square,LS)等算法获得标准互调信号的混合系数c1~cN;
5)获得PIM消除后的信号rxout:rxout=rxin-c1×imd1-…-cN×imdN,其中rxin为接收通道中进行PIM消除前的接收信号。
当然,以上只是本发明的一种实现方式,还可以采用其他方法实现消除PIM,在此不再赘述。
在另一个实施例中,所述N个回传信息为回传信号。举例来说,PIM的消除过程可以如下:
1)BBU将N个回传信号A1,…,AN,分别根据发射通道和接收通道的载频相对位置进行移频,将A1,…,AN搬移到接收通道载频的对应位置,得到A’1,…,A’N;
2)根据A’1,…,A’N,生成理想互调信号imd1~imdN,其中,imd1=A’ 1×A’ 1×conj(A’1),…,imdN=A’ N×A’ N×conj(A’ N),conj表示取共轭;
3)利用LMS或LS等算法获得标准互调信号的混合系数c1~cN;
4)获得PIM对消后的信号rxout:rxout=rxin-c1×imd1-…-cN×imdN,其中rxin为接收通道中进行PIM消除前的接收信号。
当然,以上只是本发明的一种实现方式,还可以采用其他方法实现对消PIM,在此不再赘述。
图6为本申请实施例提供的另一种PIM消除方法的实现示意图。
在图6所示的PIM消除方法中,由RRU作为网络设备进行PIM消除。每个RRU独立对自己接收通道中的接收信号进行PIM消除。下面以一个RRU的PIM消除为例进行说明,其他RRU的PIM消除处理相同。同时,为了简化附图和说明,图6中以一个BBU及与其连接的3个RRU为例,实际情况中一个BBU可以连接更多的RRU,其他RRU应用本申请实施例的方式与所说明的RRU一致。
RRU1~RRU3分别生成各自发射通道的回传信息。具体的回传信息生成方式可以参考图3~图5所对应的实施例,此处不再赘述。
可选的,在RRU进行PIM消除时,如果回传信息为载波初始相位信息,那么进行PIM消除的RRU还需要获取其他RRU处理的信号信息,以便重构用于生成抵消信号的射频信号。下面以所述回传信号为回传信息为例进行说明。
以RRU1的PIM消除为例,RRU1接收RRU2和RRU3的回传信息。
可选的,RRU2和RRU3可以直接将各自的回传信号发送给RRU1,也可以通过转发的方式进行发送。例如,RRU3将自己的回传信号发送给RRU2,RRU2再将自己的回传信号和RRU3的回传信号发送给RRU1。此回传信息的转发方式可以简化多个RRU之间的连接关系,简化网络结构。具体的回传信号发送方式可以参考图3~图5所对应的实施例,不同仅在于在本实施例中,RRU的回传信号是发送给其他RRU进行PIM消除,此处不再赘述。特别的,在RRU转发其他RRU的回传信号时,仍然可以使用图3~图5所对应的实施例中对回传信号的分段和/或交织的处理方式,此处不再赘述。
RRU1根据接收到的RRU2和RR3的回传信息,以及自己发射通道的回传信息,对自己的接收通道中的接收信号进行PIM消除。具体的PIM消除方式可以参考图3~图5所对应的实施例中的相关描述,此处不再赘述。
图7为本申请实施例提供的又一种PIM消除方法的实现示意图。
在图7所示的PIM消除方法中,由RRU作为网络设备进行PIM消除。
与图6所对应的实施例不同的是,本实施例中,RRU将生成的回传信息发送给BBU,再由BBU将所有的回传信息发送给每个需要进行PIM消除的RRU,这样可以利用RRU与BBU之间的现有接口,避免RRU之间相互进行回传信息的传输。
可选的,在RRU将自己的回传信息发送给BBU时,或者BBU将所有的回传信息发送给某一个RRU时,均可以采用图3~图5所对应的实施例中对回传信息的分段和/或交织的处理方式,此处不再赘述。
可选的,BBU将回传信息发送个每一个RRU时,可以将包括该RRU本身的回传信息,也可以仅发送其他RRU的回传信息。例如,RRU1需要包括其自身的回传信息在内的N个回传信息进行PIM消除,则BBU接收到N个回传信息后,可以将所述N个回传信息都发送给RRU1,也可以将不包括RRU1自身的回传信息的N-m个回传信息发送给RRU1,其中m表示RRU1本身生成的回传信息个数。特别的,如果RRU1还转发其他RRU的回传信息给BBU,那么BBU也可以选择是否需要发送RRU1转发的回传信息给RRU1。
除上述特别说明外,图7所对应的实施例的其他处理过程可以参考图6所对应的实施例,此处不再赘述。
需要说明的是,本申请中对RRU所做的编号,如“RRU1”、“RRU2”等等,仅为了描述清晰,不构成限定。
需要说明的是,一个基站中存在多个BBU共存、每个BBU连接至少一个RRU的场景下,也可以采用本申请实施例提供的方法进行消除BBU或者RRU的接收通道中的PIM,对于不直接连接的BBU和RRU之间或者RRU和RRU之间,回传信息可以通过上述实施例中提供的转发实现传输,具体可以参考前面的描述,在此不再赘述。
上述本申请提供的实施例中,分别从各个网元本身、以及从各个网元之间交互的角度对本申请实施例提供的数据传输方法进行了介绍。各个网元,例如BBU、RRU等为了实现上述功能,其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到,结合本文中所公开的
实施例描述的各示例的单元及算法步骤,本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本申请的范围。
图8示出了本申请实施例中所涉及的网络设备的一种可能的结构示意图。
可选的,所述数据发送设备可以是BBU,也可以是RRU,也可以是由芯片和/或各种分立器件构成的一种装置。
在一个实施例中,网络设备的结构中包括接收器和处理器。在一个实施例中,网络设备还可以包括存储器。在一个实施例中,网络设备还可以包括通信单元,用于与其他网络设备的通信。在图8所对应的实施例中,本申请所涉及的网络设备的结构中包括接收器801,处理器802和存储器803。其中,接收器用于上述实施例中所涉及的回传信息,处理器用于根据所述回传信息进行PIM消除以及完成上述图3~图7对应的实施例中网络设备所涉及的其他处理过程。
图9给出了本申请实施例中所涉及的RRU的一种可能的结构示意图。
在一个实施例中,RRU的结构中包括处理器和发射器。在一个实施例中,所述RRU还可以包括接收器。在一个具体的实施例中,RRU的结构中还可以包括存储器。在一个具体的实施例中,RRU的结构中还可以包括无线信号发射器和无线信号接收器。在图9所对应的实施例中,RRU结构中包括接收器901、发射器902、处理器903、无线信号发射器904和无线信号接收器905。其中,接收器901,用于支持RRU接收其他RRU或者BBU发送的信息或指令,例如,接收BBU发送的基带信号,和/或在需要进行PIM消除时接收回传信息。发送器902,用于支持RRU发送所需要的信息或指令给BBU或者其他RRU,例如,发送经过处理的无线接收信号,和/或发送自身的回传信息给BBU或者其他RRU。处理器903用于支持RRU执行上述图3~图7对应的实施例中任何一种或多种RRU行为,例如,生成回传信息和/或进行PIM消除。
无线信号发射器904和无线信号接收器905用于支持RRU对通过空口发送和接收的无线信号进行发送和接收处理,例如,无线信号发射器中可以进行射频信号的相关处理,功率放大等处理,当然所述处理也可以在处理器中进行,本申请对此不做限定。
图9仅仅示出了RRU的简化设计。在实际应用中,RRU还可以包含任意数量的发射器,接收器,处理器,存储器、无线信号发射器、无线信号接收器等,而所有可以实现本申请的RRU都在本申请的保护范围之内。
图10给出了本申请实施例所涉及的BBU的一种可能的结构示意图。
在一个实施例中,BBU的结构中包括接收器和发射器。在一个实施例中,所述BBU还可以包含处理器。在一个实施例中,所述BBU还可以包括存储器。在一个实施例中,所述BBU还可以包括通信单元,用于与其他BBU进行通信。在图10的实施例中,BBU包括发射器1001,接收器1002,处理器1003和存储器1004。发射器1001,用于支持BBU向RRU发送本申请实施例中所需的信号或者指令,例如发送回传信息或者发送其他CPRI口所需要发送的数据。接收器1002,用于支持BBU接收本申请实施例所需的信号或者指令,例如接收回传信息。处理器1003,用于支持BBU执行上述图3~图7实施例中BBU所涉及的处理过程,例如基带信号处理、PIM消除、控制回传信息的接收和转发等一项或者多项功能。存储器1004,所述存储器用于与处理器耦合,保存BBU必要的程序指令和数据。
图11给出了本申请实施例所涉及的基站的一种可能的结构示意图。
在一个实施例中,所述基站包含一个BBU和与所述BBU相连接的至少一个RRU。在一个实施例中,所述基站还可以包含更多的BBU以及RRU。在图11所对应的实施例中,基站包括BBU1102和与BBU1102相连接的多个RRU1101。其中BBU1102可以支持上述图3~图7所对应的实施例中BBU所具备的功能,RRU1101可以支持上述图3~图7所对应的实施例中RRU所具备的功能。
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个
其中包含有计算机可用程序代码的计算机可用存储信道(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器指令,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然,本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样,倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
Claims (17)
- 一种PIM消除方法,其特征在于,包括:网络设备获取N个回传信息,一个所述回传信息包含一个发射通道中的各个载波的初始相位信息,其中N为大于等于1的整数;所述网络设备根据所述N个回传信息消除所述网络设备的接收通道中的接收信号的PIM。
- 如权利要求1所述的方法,其特征在于,所述N个回传信息为N个回传信号,一个所述回传信号为一个发射通道中经过移频的单载波信号或经过多载波合路的多载波混合信号。
- 如权利要求2所述的方法,其特征在于,所述回传信号还可以经过如下至少一种处理:波峰因数降低CFR处理;数字预失真DPD处理;射频功率放大和反馈处理。
- 如权利要求1至3任一项所述的方法,其特征在于,所述网络设备为基带处理单元BBU,所述方法还包括:与所述网络设备连接的M个射频拉远单元RRU向所述网络设备发送所述N个回传信息,其中M为大于等于1小于等于N的整数。
- 如权利要求2或3所述的方法,其特征在于,所述网络设备为RRU,所述方法还包括:除所述网络设备之外的其他M个RRU向所述网络设备发送所述N个回传信息,其中M为大于等于1小于等于N的整数;所述M个RRU与所述网络设备连接同一个BBU。
- 如权利要求2或3所述的方法,其特征在于,所述网络设备为RRU,所述方法还包括:与所述网络设备连接的BBU接收M个RRU发送的所述N个回传信息,其中M为大于等于1小于等于N的整数;所述BBU将所述N个回传信息发送给所述网络设备。
- 如权利要求4至6任一项所述的方法,其特征在于,所述RRU发送所述回传信息,包括:所述RRU将要发送的至少一个回传信息划分为K段信息,并将所述K段信息分别发送,其中K为大于等于1的整数;或者所述RRU将要发送的至少一个回传信息进行交织并划分为K段信息,再将所述K段信息分别发送,其中K为大于等于1的整数。
- 一种网络设备,其特征在于,包括:接收器,用于接收N个回传信息,一个所述回传信息包含一个发射通道中的各个载波的初始相位信息,其中N为大于等于1的整数;处理器,用于根据所述N个回传信息,消除所述网络设备的接收通道中的接收信号的PIM。
- 如权利要求8所述的网络设备,其特征在于,所述N个回传信息为N个回传信号,所述N个回传信号分别为N个发射通道中经过移频的单载波信号或经过多载波合路的多载波混合信号。
- 一种RRU,其特征在于,包括:处理器,用于生成至少一个回传信息,一个所述回传信息包含一个发射通道中的各个载波的初始相位信息,其中N为大于等于1的整数;发射器,用于发送所述至少一个回传信息。
- 如权利要求10所述的RRU,其特征在于,所述至少一个回传信息为至少一个回传信号,所述处理器具体用于,对至少一个发射通道中的信号进行移频或者移频和多载波合路,生成所述至少一个回传信号。
- 如权利要求11所述的RRU,其特征在于,所述处理器还用于对所述至少一个回传信号进行如下至少一种处理:波峰因数降低CFR处理;数字预失真DPD处理;射频功率放大和反馈处理。
- 如权利要求10至12任一项所述的RRU,其特征在于,所述处理器 还用于:将要发送的至少一个回传信息划分为K段信息,并将所述K段信息分别发送,其中K为大于等于1的整数;或者将要发送的至少一个回传信息进行交织并划分为K段信息,再将所述K段信息分别发送,其中K为大于等于1的整数。
- 如权利要求10至13任一项所述的RRU,其特征在于,所述RRU还包括:接收器,用于接收其他RRU发送的至少一个回传信息;所述发射器,还用于发送所述接收的至少一个回传信息。
- 一种BBU,其特征在于,包括:接收器,用于接收N个回传信号,所述N个回传信号分别为N个发射通道中经过移频的单载波信号或经过移频和多载波合路的多载波混合信号,其中N为大于等于1的整数;发送器,用于发送所述N个回传信号给至少一个RRU。
- 一种基站,其特征在于,包括:如权利要求8或9任一项所述的网络设备和如权利要求10至14任一项所述的RRU。
- 如权利要求16所述的基站,其特征在于,还包括:如权利要求15所述的BBU。
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EP16917369.7A EP3509223B1 (en) | 2016-09-30 | 2016-09-30 | Passive intermodulation (pim) cancellation method and device, and base station |
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CN201680089684.4A CN110235376B (zh) | 2016-09-30 | 2016-09-30 | 一种无源互调pim消除方法、装置及基站 |
MX2019003554A MX2019003554A (es) | 2016-09-30 | 2016-09-30 | Metodo de eliminacion de intermodulacion pasiva pim, aparato y estacion base. |
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US20190229760A1 (en) | 2019-07-25 |
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US11121734B2 (en) | 2021-09-14 |
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