WO2014101808A1 - 通道校正装置、方法及系统 - Google Patents

通道校正装置、方法及系统 Download PDF

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Publication number
WO2014101808A1
WO2014101808A1 PCT/CN2013/090625 CN2013090625W WO2014101808A1 WO 2014101808 A1 WO2014101808 A1 WO 2014101808A1 CN 2013090625 W CN2013090625 W CN 2013090625W WO 2014101808 A1 WO2014101808 A1 WO 2014101808A1
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Prior art keywords
channel
radio frequency
signal
correction
bbu
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PCT/CN2013/090625
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English (en)
French (fr)
Inventor
官鹭
陈卫民
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华为技术有限公司
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Publication of WO2014101808A1 publication Critical patent/WO2014101808A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a channel correction apparatus, method, and system.
  • BBU indoor baseband unit
  • RRU radio remote unit
  • the BBU is connected to one or more RRUs through an optical fiber, and one or more service interfaces are disposed on each RRU, and the RRU is connected to the coupling unit through a service interface.
  • the coupling unit is a separately arranged coupling disc, the RRU is connected to the antenna through the coupling disc; if the coupling unit is a coupling structure disposed inside the antenna, the RRU is directly connected to the antenna.
  • Each service interface is connected to a receiving service channel and a sending service channel, so that the RRU receives the radio frequency signal sent by the coupling unit by using the receiving service channel, or sends the radio frequency signal to the coupling unit by using the sending service channel.
  • TDD Time Division Duplexing
  • the BBU estimates the channel response of the uplink channel by detecting a Sounding Reference Signal (SRS) sent by the User Equipment (UE), where the upper and lower channels include the RRU receiving service channel. .
  • SRS Sounding Reference Signal
  • UE User Equipment
  • the BBU can use the channel response of the estimated uplink channel as the channel response of the downlink channel, and use the calculated weight to perform beamforming on the downlink signal.
  • the beam shaped signal is transmitted.
  • the RRU's receiving and service channels are composed of independent hardware, their channel responses are different.
  • the beamforming of the TDD system requires a consistent channel response between the received service channels, and also requires a consistent channel response between the various service channels. Therefore, it is necessary to receive the service channels and/or the RRUs.
  • Send traffic channels for channel correction In order to compensate the channel response of each receiving service channel or the sending service channel separately, the ratio of the channel response of the receiving service channel connected to each service interface to the transmitting service channel is the same.
  • FIG 1 is a schematic diagram of a single RRU channel calibration with an external correction interface, as shown in Figure 1.
  • the RRU includes not only a plurality of service interfaces but also a communication interface connected to the BBU, and a correction interface.
  • the connection relationship between each service interface and the coupling unit is represented by a double-headed arrow, and the service channel and the service channel are connected on behalf of each service interface; the connection relationship between the calibration interface and the coupling unit is also represented by a double-headed arrow, which represents the correction interface connection.
  • the RRU sends the signal received by the service interface to the BBU through the communication interface connected to the BBU, so that the BBU can perform channel correction on each received service channel, or send the signal received by the calibration interface to the BBU through the calibration channel. For the BBU to perform channel correction for each service channel.
  • Joint Transmission (JT) technology in Coordinative Multiple Point (CoMP) technology enables UEs in multiple cell critical areas to receive Transmit data sent to RRUs of multiple cells.
  • the BBU in order to ensure the effect of the joint transmission technology, the BBU not only needs to perform channel correction for each of the received service channels or the service channel in a single RRU, but also needs to receive multiple pieces of multiple RRUs for joint transmission.
  • the service channel or the service channel performs unified channel correction.
  • the channel correction performed by the BBU in the prior art on the receiving service channel or the service channel can only be implemented in a single RRU, and it is not possible to The channel is corrected for the service channel or the service channel.
  • the present invention provides a channel correction apparatus, method, and system for solving the problem that channel correction cannot be uniformly performed for each of a plurality of RRUs.
  • a first aspect of the present invention provides a channel correction apparatus including: a first communication interface, a signal conversion unit, and at least two correction interfaces;
  • the first communication interface is communicatively coupled to the indoor baseband unit BBU for receiving a baseband reference signal from the BBU;
  • the signal conversion unit is respectively connected to the first communication interface and the at least two calibration interfaces, configured to convert the baseband reference signal into a radio frequency reference signal, and send the radio frequency reference signal to the at least two Correction interface;
  • the at least two correction interfaces are respectively communicatively coupled to the at least two coupling units for transmitting the radio frequency reference signals to the at least two coupling units, respectively.
  • the channel correction device further includes at least one second communication interface connected to the signal conversion unit;
  • the at least one second communication interface is communicatively coupled to one of the at least two coupling units for receiving a radio frequency feedback signal returned by the coupling unit, and transmitting the radio frequency feedback signal to the signal conversion Unit
  • the signal conversion unit is further configured to: convert the radio frequency feedback signal into a baseband feedback signal, and send the baseband feedback signal to the first communication interface, where the first communication interface is to be The baseband feedback signal is sent to the BBU.
  • the channel calibration apparatus further includes a branching or combining unit;
  • the splitting or combining unit is respectively connected to the signal converting unit and the at least two correcting interfaces, and configured to allocate the radio frequency reference signal output by the signal converting unit to at least two signals, and send the signals to the at least two signals respectively.
  • Two calibration interfaces Two calibration interfaces.
  • a second aspect of the present invention provides a channel calibration apparatus, including: a first communication interface, a signal conversion unit, and at least two correction interfaces;
  • the at least two calibration interfaces are respectively connected to at least two coupling units for receiving at least two radio frequency feedback signals respectively sent by the at least two coupling units;
  • the signal conversion unit is respectively connected to the at least two correction interfaces and the first communication interface, configured to convert the at least two radio frequency feedback signals into baseband feedback signals, and send the baseband feedback signals to the Said first communication interface;
  • the first communication interface is communicatively coupled to the BBU for transmitting the baseband feedback signal to the BBU.
  • the channel correction device further includes at least one second communication interface connected to the signal conversion unit, the at least one second communication The interface is communicatively coupled to one of the at least two coupling units;
  • the first communications interface is further configured to: receive a baseband reference signal from the BBU;
  • the signal conversion unit is further configured to convert the baseband reference signal into a radio frequency reference signal and send the signal to the at least one second communication interface;
  • the at least one second communication interface is configured to: use the radio frequency reference signal And transmitting to the coupling unit, so that the coupling unit returns a radio frequency feedback signal of the radio frequency reference signal to one of the at least two correction interfaces.
  • the channel calibration apparatus further includes a branching or combining unit;
  • the splitting or combining unit is respectively connected to the signal converting unit and the at least two correcting interfaces, and is configured to combine at least two RF feedback signals respectively received by the at least two correcting interfaces into one signal , sent to the signal conversion unit.
  • a third aspect of the present invention provides a channel correction method, including:
  • the method further includes:
  • a fourth aspect of the present invention provides a channel correction method, including:
  • the baseband feedback signal is sent to the BBU.
  • the method further includes:
  • a fifth aspect of the present invention provides a channel correction system including at least one BBU, The channel correcting device, the at least one radio remote unit RRU, and the at least two coupling units; the BBU, the channel correcting device, the RRU, and the coupling unit are communicatively coupled.
  • the channel calibration apparatus, method and system provided by the embodiments of the present invention respectively connect two or more coupling units by using two or more correction interfaces, and send the radio frequency reference signals to the coupling unit through the correction interfaces, so as to be used for
  • the BBU that performs channel correction can obtain an estimated value of the channel response of the RRU receiving service channel, or receive the radio frequency feedback signal from each coupling unit through each correction interface, so that the BBU used for channel correction can obtain the RRU transmission service.
  • FIG. 1 is a schematic diagram of a single RRU channel calibration with an external correction interface
  • FIG. 2 is a schematic structural diagram of a channel calibration apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another channel correcting apparatus according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of another channel correcting apparatus according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a channel correction device according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a channel calibration system according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of another channel correction system according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a channel calibration method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of another channel correction method according to an embodiment of the present invention.
  • the channel calibration apparatus includes a first communication interface 11, a signal conversion unit 12, and at least two correction interfaces 13.
  • the first communication interface 11 is communicably connected to the BBU, and the signal conversion unit 12 is respectively connected to the first communication interface 11 and the at least two correction interfaces 13, and the at least two correction interfaces 13 are respectively communicatively connected to at least two coupling units.
  • the channel correcting device is connected to the BBU through the first communication interface 11, and is connected to the coupling unit through the correcting interface 13.
  • the correction interface 13 on the channel correction device may be two or more, and each correction interface 13 is connected to one coupling unit.
  • Each coupling unit includes a coupling unit correction interface for connection to the correction interface 13, and one or more coupling unit service interfaces for connection to the service interface of the RRU.
  • the coupling unit may be a separate coupling disc disposed between the channel correcting device and the antenna, or may be a coupling structure inside the antenna. When the coupling unit is a separate coupling disk disposed between the channel correcting device and the antenna, an interface for connecting to the antenna is further included on the coupling unit.
  • Two or more coupling units are respectively connected to the respective correction interfaces 13 of the same channel correction device through respective coupling unit correction interfaces, and each coupling unit is respectively connected to a different RRU through a respective coupling unit service interface.
  • Each RRU and channel correction device can be connected to the same BBU or to different BBUs.
  • the method for channel correction for the receiving service channel and the transmitting service channel is as follows.
  • the channel correction method of the specific service channel is: the BBU connected to the channel calibration device sends the baseband reference signal to the channel calibration device; the channel calibration device receives the baseband reference signal from the BBU through the first communication interface 11, and the baseband is The reference signal is sent to the signal conversion unit 12 in the channel correction device; the signal conversion unit 12 converts the baseband reference signal into a radio frequency reference signal and transmits the radio frequency reference signal to two or more correction interfaces 13 in the channel correction device
  • the calibration interface 13 to which the coupling unit is connected transmits the received radio frequency reference signal to the connected coupling unit, that is, when the channel correction device is connected to two or more coupling units, the radio frequency reference signal is respectively sent to the Two or more coupling units.
  • each coupling unit After each coupling unit receives the radio frequency reference signal from the channel correcting device through the coupling unit correction interface, a part of the radio frequency reference signal is sent to the antenna or transmitted through the antenna, and according to the structure of the coupling unit, the radio frequency reference signal is A small portion of the signal is fed back to the connected RRU. That is, each coupling unit sends a radio frequency feedback signal to the connected RRU.
  • the ratio of the coupling unit transmitting or feeding back the received RF reference signal is determined by the structure of the coupling unit.
  • Each RRU receives an RF feedback signal through one or more service interfaces, that is, The RRU receives the RF feedback signal through one or more uplink receiving service channels, converts the RF feedback signal received by each uplink receiving service channel into a baseband feedback signal, and sends the baseband feedback signal to the connected BBU. Due to the influence of the hardware structure of the RRU, the signal is changed after the uplink receiving service channel or the downlink service channel of the RRU, that is, when the signal passes through each uplink receiving service channel or downlink service channel, respectively. Different channel responses.
  • each RRU is connected to the channel correction device on the same BBU, the RRU returns a baseband feedback signal to the BBU, and the RRU estimates the channel response of each uplink service channel according to the received baseband feedback signal, thereby It is possible to calculate an estimated value of the channel response of each uplink service channel of each RRU.
  • the BBU is used as the BBU for channel correction. Therefore, the BBU performs unified correction on each uplink service channel of each RRU according to the calculated estimated values.
  • the RRUs and the channel correction devices are connected to different BBUs, the RRUs send the baseband feedback signals to the connected BBUs, and the BBUs respectively receive the uplink receiving services of the connected RRUs according to the received baseband feedback signals.
  • the channel response of the channel is estimated.
  • one of the BBUs is used as a BBU for channel correction.
  • the BBU connected to the RRU sends each estimated value to the BBU for channel correction. Therefore, the BBU for channel correction performs unified channel correction on each of the RRU service channels.
  • the BBU used for channel correction may be a BBU connected to the channel correction device or a BBU connected to the channel correction device.
  • each coupling unit is respectively connected to the RRU, and therefore, regardless of whether each RRU and the channel correcting device are connected to the same BBU,
  • the BBUs used for channel correction are able to know the estimated values of the channel responses of the respective receiving service channels on the RRUs to which the respective coupling units are respectively connected. Therefore, the BBU for channel correction performs unified channel correction on each of the RRU service channels.
  • the method for estimating the channel response of the receiving service channel by the BBU according to the baseband feedback signal may use an implementation similar to that in the prior art, and details are not described herein again.
  • the specific method of channel correction for transmitting a service channel is as follows. If each RRU is connected to the channel correction device on the same BBU, the BBU uniformly transmits the baseband reference signal to each RRU.
  • each RRU and the channel correction device are connected to different BBUs, one or more BBUs connected to the RRUs use preset time resources, frequency resources, or code domain resources according to a preset rule of transmitting a baseband reference signal.
  • the baseband reference signal is sent to each RRU.
  • each RRU After receiving the baseband reference signal, each RRU converts the baseband reference signal into a radio frequency reference signal, and sends the radio frequency reference signal to the connected coupling unit through at least one service interface; the coupling unit will receive the radio frequency reference signal A part of it is sent to the antenna or transmitted through the antenna, and a small part of the RF reference signal is fed back to the connected channel correcting device through the coupling unit correction interface thereon.
  • the RF unit feedback signal returned by the coupling unit to the channel correction device through the coupling unit correction interface includes multiple transmissions. RF feedback signal for the service channel.
  • the two or more correction interfaces 13 of the channel correction device respectively receive the RF feedback signal, and the plurality of RF feedback signals include the RF feedback signals of the service channels of the plurality of RRUs. .
  • the channel correction device converts the RF feedback signals respectively received by the two or more correction interfaces 13 into a baseband feedback signal by the signal conversion unit 12, and transmits the baseband feedback signal to the connected BBU through the first communication interface 11. Since the baseband feedback signal includes baseband feedback signals of each of the plurality of RRUs, the baseband feedback signals are processed according to a preset rule according to time division, frequency division or code division, respectively, and each RRU is obtained. The complete channel response estimates for each of the served traffic channels, such that the BBU can calculate an estimate of the channel response for each of the RTU's outgoing traffic channels.
  • each coupling unit is respectively connected to the RRU, so that the BBU connected to the channel correcting device can be calculated regardless of whether each RRU and the channel correcting device are connected to the same BBU.
  • each of the RRUs may be sent according to each estimated value. Unified channel correction.
  • the BBU connected to the channel correction device may also send each estimated value to another BBU for channel correction, so that the BBU performs unified channel correction on each of the RDU service channels according to each estimated value.
  • the BBU estimates the channel response of the service channel according to the baseband feedback signal, and may implement an implementation similar to that in the prior art, and details are not described herein.
  • the channel calibration apparatus connects two or more coupling units by using two or more correction interfaces, and sends the radio frequency reference signals to the coupling unit through the correction interfaces, so as to perform channel correction.
  • the BBU can obtain an estimated value of the channel response of the RRU receiving service channel, or receive the radio frequency feedback signal from each coupling unit through each correction interface, so that the BBU used for channel correction can obtain the channel response of the RRU serving service channel.
  • the estimated value is used to perform unified channel correction on the receiving service channel or the sending service channel of each RRU by using the BBU for channel correction.
  • FIG. 3 is a schematic structural diagram of another channel calibration apparatus according to an embodiment of the present invention.
  • the channel calibration apparatus further includes at least one second communication interface 14.
  • the at least one second communication interface 14 is connected to the signal conversion unit 12 inside the channel correction device, and is communicably connected to one of the at least two coupling units outside the channel correction device.
  • the channel correcting device in the embodiment of the present invention may further include at least one second communication interface 14, which is used on the RRU.
  • the channel correcting means may have the function of an RRU, but the RRU includes only one correcting interface, and the channel correcting means in the embodiment of the present invention includes at least two correcting interfaces 13. At least two correction interfaces 13 are connected to the signal conversion unit 12, specifically between the signal conversion unit 12 and the at least two correction interfaces 13, and the method for signal splitting or combining is implemented, and the prior art can be used. A similar implementation in this case is not covered here.
  • the channel correction device can be directly connected to a coupling unit by means of the at least one second communication interface 14. That is to say that the coupling unit to which the at least one second communication interface 14 of the channel correction device is connected is also connected to one of the at least two correction interfaces 13 of the channel correction device. Another one or more correction interfaces 13 of the channel correction device may be respectively connected to other Coupling units, and these coupling units are respectively connected to other RRUs.
  • the channel correcting device is used as a special RRU with RRU function, and in the method for correcting the channel of the receiving service channel, based on the above embodiment, the second communication interface 14 of the channel correcting device is connected.
  • the coupling unit transmits the radio frequency feedback signal of the radio frequency reference signal to the second communication interface 14 of the channel correction device through the coupling unit service interface of the coupling unit after receiving the radio frequency reference signal through the coupling unit correction interface of the coupling unit.
  • the second communication interface 14 is converted into a baseband feedback signal by the signal conversion unit 12, and transmits the baseband feedback signal to the connected BBU through the first communication interface 11.
  • the coupling unit connected to the other calibration interface of the channel calibration device respectively sends the RF feedback signal to the corresponding RRU, and the steps of each RRU converting the RF feedback signal into a baseband feedback signal and sending the signal to the connected BBU, and subsequent steps
  • the steps of each RRU converting the RF feedback signal into a baseband feedback signal and sending the signal to the connected BBU, and subsequent steps refer to the implementation manner in the above embodiment.
  • the resource or code domain resource sends the baseband reference signal to each RRU; the BBU connected to the channel correction device also uses the preset time resource, frequency resource or code domain resource to reference the baseband according to a preset rule of transmitting the baseband reference signal.
  • a signal is sent to the channel correction device.
  • the channel correcting device After receiving the baseband reference signal, the channel correcting device converts the baseband reference signal into a radio frequency reference signal, and sends the radio frequency reference signal to the connected coupling unit through the second communication interface 14, and the coupling unit receives the received radio frequency reference signal. A small portion of the correction interface is fed back to the connected channel correction device via the coupling unit on it.
  • the channel correcting device can be used as a special RRU, the channel correcting device can perform the channel correcting of the receiving or transmitting service channel.
  • the channel correcting device can perform the channel correcting of the receiving or transmitting service channel.
  • FIG. 4 is a schematic structural diagram of still another channel calibration apparatus according to an embodiment of the present invention.
  • the channel calibration apparatus further includes a branching or combining unit 15.
  • the branching or combining unit 15 is connected to the signal converting unit 12 and the at least two correcting interfaces 13, respectively.
  • a split or combine unit for distributing the RF reference signal output by the signal conversion unit 12 Transmitting at least two signals to the at least two correction interfaces 13 respectively; or merging the at least two RF feedback signals respectively received by the at least two correction interfaces 13 into one signal, and transmitting the signals to the at least two signals Signal conversion unit 12.
  • the shunt or combination unit is a shunt/combination circuit having a function of one minute or more, and the number of specific branches is equal to the number of correction interfaces 13.
  • the signal conversion unit 12 converts the baseband reference signal into a radio frequency reference signal
  • the RF reference signal is split into at least two signals through the shunting or combining unit, and sent to the coupling unit through the calibration interface 13, respectively.
  • the shunting or combining unit may have the function of splitting the signal, and may also have a power compensation function, so that the signal after the splitting transmits power on each branch, which is the same as the transmission power of the signal before the shunting.
  • the RF feedback signals are combined into one signal and sent to the signal conversion unit 12 via the branching or combining unit.
  • the channel calibration apparatus realizes that the radio frequency reference signal can be simultaneously transmitted to two or more coupling units by using the shunting or combining unit and the same correction interface as the number of branches, or at least two The RF feedback signals received by the calibration interface are combined into one signal, so that the BBU for performing channel correction can perform unified channel correction for each of the received service channels or the service channels of each RRU.
  • FIG. 5 is a schematic structural diagram of still another channel calibration apparatus according to an embodiment of the present invention. As shown in FIG. 5, the channel calibration apparatus includes:
  • the processor 21, the memory 22 and the communication interface 24 are connected by a bus 23 and perform communication with each other.
  • the processor 21 may be a single core or multi-core central processing unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement the embodiments of the present invention. Circuit.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • the memory 22 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 22 is used to store the program 221.
  • the program 221 may include a program generation Code
  • the program code includes computer operating instructions.
  • the first communication interface 24 is configured to receive a baseband reference signal sent by the BBU.
  • the processor 21 runs the program 221 to execute:
  • the channel correction device in the embodiment of the present invention performs channel correction, and the implementation manner in the corresponding device embodiment is not described herein.
  • FIG. 6 is a schematic structural diagram of still another channel calibration apparatus according to an embodiment of the present invention. As shown in FIG. 6, the channel calibration apparatus includes:
  • the processor 31, the memory 32, and the communication interface 34 are connected by a bus 33 and perform communication with each other.
  • the processor 31 may be a single core or multi-core central processing unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement the embodiments of the present invention. Circuit.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • the memory 32 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 32 is used to store the program 321 .
  • the program 321 may include a program code, where the program code includes a computer operation instruction.
  • the first communication interface 34 is configured to receive at least two radio frequency feedback signals sent by the at least two coupling units.
  • the processor 31 runs the program 321 to execute:
  • the baseband feedback signal is sent to the BBU.
  • the channel correction device in the embodiment of the present invention performs channel correction, and the implementation manner in the corresponding device embodiment is not described herein.
  • FIG. 7a is a schematic structural diagram of a channel calibration system according to an embodiment of the present invention.
  • the channel calibration system includes at least one BBU1, channel correction device 2, at least two RRU3s, and at least two coupling units 4.
  • the BBU 1 sends the baseband reference signal to the channel correcting device 2;
  • the channel correcting device 2 converts the baseband reference signal into a radio frequency reference signal, and sends the signal to the radio frequency reference signal through at least two calibration interfaces.
  • At least two coupling units 4 respectively transmit the radio frequency feedback signals of the radio frequency reference signals to the service interfaces of the connected RRU3 through the respective coupling unit service interfaces; after receiving the radio frequency feedback signals, the RRU3 sends the RF feedback signals.
  • the signal is converted to a baseband feedback signal and sent to the connected BBU1.
  • the RRU 3 If the RRU 3 is connected to the channel correction device 2 on the same BBU 1, the RRU 3 sends the RF feedback signal to the BBU 1 ; if the RRU 3 and the channel correction device 2 are connected to different BBUs, the RRU 3 sends the RF feedback signal to the RRU 3 .
  • the BBU calculates the estimated channel response of each receiving service channel according to the radio frequency feedback signal
  • the estimated value of the channel response of each receiving service channel is sent to the BBU1 connected to the channel correcting device 2 by the BBU.
  • the BBU1 uniformly performs channel correction according to the estimated value of the channel response of each of the received service channels of each RRU3.
  • the BBU1 sends a baseband reference signal to at least two connected RRU3s; if each RRU3 is connected to two or more BBUs respectively
  • the BBU transmits the baseband reference signal to each RRU3 according to the preset rule of transmitting the baseband reference signal.
  • each RRU3 After receiving the baseband reference signal, each RRU3 converts the baseband reference signal into a radio frequency reference signal, and sends the radio frequency reference signal to the connected coupling unit 4; each coupling unit 4 respectively receives the signal on the coupling unit service interface.
  • the RF feedback signal of the RF reference signal is sent to the calibration interface of the channel correction device 2 through the coupling unit correction interface; thus, at least two correction interfaces of the channel correction device 2 respectively receive the RF feedback signal and convert the RF feedback signal into a baseband After the feedback signal, it is sent to the connected BBU1.
  • the BBU1 connected to the channel correcting device calculates an estimated channel response of each of the service channels of each RRU3 according to the received baseband feedback signals, and performs channel response according to each of the RRU3 service channels.
  • the estimated value is unified for channel correction.
  • the BBU1 sends each estimated value to the BBU for channel correction to perform channel correction on each of the RRU3 service channels.
  • the RRU3 in the embodiment of the present invention may be two or more, and correspondingly, the coupling unit 4 may be two or more. In the figure, only the case where the RRU3 and the coupling unit 4 are two are respectively exemplified. Description.
  • FIG. 7b is a schematic structural diagram of another channel correction system according to an embodiment of the present invention.
  • the channel correction system includes at least one BBU1, channel correction device 2, at least one RRU3, and at least two coupling units 4.
  • the BBU 1 sends the baseband reference signal to the channel correcting device 2; the channel correcting device 2 converts the baseband reference signal into a radio frequency reference signal, and sends the signal to the radio frequency reference signal through at least two calibration interfaces.
  • the RRU3 and the channel correcting device 2 respectively convert the RF feedback signal into a baseband feedback signal and send it to the connected BBU1.
  • the RRU 3 and the channel correcting device 2 can send the RF feedback signal to the BBU 1; if the RRU 3 and the channel correcting device 2 are connected to different BBUs, the RRU 3 The RF feedback signal is sent to the connected BBU. After the BBU calculates the estimated channel response of each receiving service channel according to the RF feedback signal, the estimated value of the channel response of each receiving service channel is sent to the channel correcting device 2 The connected BBU1 performs channel correction uniformly by the BBU1 based on the estimated values of the channel responses of the RRU3 and the channel receiving service channels of the channel correcting device 2.
  • the BBU1 connected to the channel correcting device 2 and the BBU connected to the RRU3 may send the calculated estimated value to the BBU for channel correction, so that the BBU performs unified correction on the RRU3 receiving service channel.
  • the BBU 1 transmits the baseband reference signal to the connected at least one RRU 3 and the channel correcting device 2; if the RRU 3 and the channel are corrected
  • the devices 2 are respectively connected to two BBUs, and the BBUs transmit the baseband reference signals according to the rules of the preset baseband reference signals.
  • the RRU3 and the channel correcting device 2 After receiving the baseband reference signal, the RRU3 and the channel correcting device 2 respectively convert the baseband reference signal into a radio frequency reference signal, and transmit the radio frequency reference signal to the connected coupling unit 4; each of the coupling units 4 respectively performs the coupling unit service RF reference received on the interface
  • the RF feedback signal of the signal is sent to the correction interface of the channel correction device 2 through the coupling unit correction interface; thus, at least two correction interfaces of the channel correction device 2 respectively receive the RF feedback signal, and convert the RF feedback signal into a baseband feedback signal After that, it is sent to the connected BBU1.
  • the BBU1 connected to the channel correcting device 2 calculates an estimated value of the channel response of each of the service channels of the RRU 3 according to the received baseband feedback signals, and determines the channel response of the service channel according to each RRU3. Estimated value, unified channel correction.
  • the BBU 1 sends the estimated values to the BBU for channel correction, and the BBU performs unified channel correction on each of the RRU3 service channels.
  • the RRU3 in the embodiment of the present invention may be one or more.
  • the coupling unit 4 may be two or more. In the figure, only one RRU3 is used, and the coupling unit 4 is two. for example.
  • the rules for transmitting the baseband reference signal preset in the BBU described in the above embodiments may be that the BBUs transmit the baseband reference signal according to the frequency division, time division or code division.
  • the BBU for channel correction performs channel correction according to an estimated value of the channel response of each of the RRU and/or the channel correcting device.
  • the estimated channel response of the traffic channel is H; where k represents one of the RRU or channel correction devices; i represents a certain service channel of the device.
  • the method by which the BBU connected to the channel correcting means performs channel correction based on the estimated values of the channel responses of the respective receiving channels of the RRU and/or channel correcting means is as follows.
  • the estimated channel response of the received service channel is H; where k represents one of the RRU or channel correction devices; and i represents a certain received service channel of the device.
  • the method for compensating the service channel and the service channel is as follows.
  • the BBU for channel correction calculates the channel response of the signal transmitted on the received service channel, and multiplies the value of the channel response by The compensation coefficient of the corresponding receiving service channel is obtained, and the weight of the corresponding corresponding service channel is obtained.
  • the weight of the estimated service channel is multiplied by The signal itself is multiplied by the compensation coefficient of the corresponding transmission service channel, so that the transmission signal after the compensation of the received service channel and the compensation of the service channel is obtained.
  • the UE does not perceive the inconsistency of each of the multiple RRUs, that is, completes the channel correction process of multiple RRUs.
  • FIG. 8 is a flowchart of a channel calibration method according to an embodiment of the present invention. As shown in FIG. 8, the method includes:
  • Step 103 Send the radio frequency reference signal to at least two coupling units.
  • Step 103 is performed for the at least two coupling units to return at least two radio frequency feedback signals of the radio frequency reference signal.
  • the method may further include:
  • FIG. 9 is a flowchart of another channel correction method according to an embodiment of the present invention. As shown in FIG. 9, the method includes:
  • the method may further include:
  • the channel correction method provided by the embodiment of the present invention uses two or more correction interfaces to respectively connect two or more coupling units, and sends the radio frequency reference signals to the coupling unit through the respective correction interfaces, so as to be used for channel correction.
  • the BBU can obtain an estimated value of the channel response of the RRU receiving service channel, or receive the radio frequency feedback signal from each coupling unit through each correction interface, so that the BBU used for channel correction can obtain the channel response of the RRU serving service channel.
  • the estimated value is used to perform unified channel correction on the receiving service channel or the sending service channel of each RRU by using the BBU for channel correction.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the above method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明提供一种通道校正装置、方法及系统，其中通道校正装置包括第一通信接口、信号转换单元和至少两个校正接口；第一通信接口与室内基带单元BBU通信连接，用于从BBU接收基带参考信号；信号转换单元分别与第一通信接口和至少两个校正接口连接，用于将基带参考信号转换为射频参考信号，并将射频参考信号发送给至少两个校正接口；至少两个校正接口分别与至少两个耦合单元通信连接，用于将射频参考信号分别发送给至少两个耦合单元。以使得用于进行通道校正的BBU，能够得到RRU的发业务通道的信道响应的估计值，从而实现利用该用于进行通道校正的BBU对各RRU的收业务通道或发业务通道进行统一的通道校正。

Description

通道校正装置、 方法及系统 技术领域
本发明实施例涉及通信技术， 尤其涉及一种通道校正装置、 方法及系 统。 背景技术 随着通信技术的发展， 由室内基带单元 ( Building Base band Unit, BBU )和射频拉远单元（ Radio Remote Unit, RRU )组成的分布式基站得 到了广泛的应用。 在分布式基站中， BBU通过光纤与一个或多个 RRU连 接， 每个 RRU上设置有一个或多个业务接口， RRU通过业务接口与耦合 单元连接。 若耦合单元为独立设置的耦合盘， 则 RRU通过该耦合盘与天 线连接； 若耦合单元为设置于天线内部的耦合结构， 则 RRU直接与天线 连接。 每个业务接口连接有收业务通道和发业务通道， 以使 RRU利用收 业务通道接收耦合单元发送的射频信号，或者利用发业务通道向耦合单元 发送射频信号。 在时分双工 （ Time Division Duplexing, TDD ) 系统中， 每个业务接口在同一时刻开启收业务通道或发业务通道。
在 TDD系统中 , BBU通过检测用户设备（ User Equipment, UE ) 所 发送的探测参考信号 （ Sounding Reference Signal, SRS ), 对上行信道的 信道响应进行估计，其中上下信道中包含有 RRU的收业务通道。根据 TDD 系统中的上行信道和下行信道的互易性， BBU 可以利用所估计出的上行 信道的信道响应， 作为下行信道的信道响应， 并利用其计算权值， 对下行 信号进行波束赋形， 以将波束赋形后的信号发射出去。
由于 RRU的各条收业务通道和发业务通道是由独立的硬件构成， 它 们的通道响应各不相同。 而 TDD系统的波束赋形要求各条收业务通道之 间具有一致的信道响应， 也要求各条发业务通道之间具有一致的信道响 应，因此，需要对 RRU的各条收业务通道和 /或发业务通道进行通道校正。 以便分别对各条收业务通道或发业务通道的信道响应进行补偿，使得各条 业务接口连接的收业务通道与发业务通道的信道响应的比值相同。
图 1为单个具有外校正接口的 RRU通道校正示意图， 如图 1所示， RRU上不仅包括多个业务接口以及与 BBU连接的通信接口，还包括校正 接口。 其中， 每个业务接口与耦合单元的连接关系通过双向箭头表示， 代 表每个业务接口连接有收业务通道和发业务通道；校正接口与耦合单元的 连接关系也通过双向箭头表示，代表校正接口连接有用于收传输的通道和 用于发传输的通道， RRU 通过校正接口实现对校正参考信号的接收和发 送； 该校正接口还与 RRU内部的校正通道连接。 RRU通过与 BBU连接 的通信接口， 将业务接口所接收到的信号发送给 BBU, 以供 BBU对各条 收业务通道进行通道校正；或者将校正接口所接收到的信号利用校正通道 发送给 BBU, 以供 BBU对各条发业务通道进行通道校正。
为了提高处于小区边缘的 UE的吞吐率和平均吞吐率，利用协作多点 ( Coordinative Multiple Point , CoMP ) 技术中的联合传输 （ Joint Transmission, JT ) 技术， 使得处于多个小区临界区域的 UE 能够接收到 多个小区的 RRU发送的发数据。
在这样的应用场景下， 为了保证联合传输技术的效果， BBU 不仅需 要对单个 RRU内的各条收业务通道或发业务通道进行通道校正， 还需要 对进行联合传输的多个 RRU的各条收业务通道或发业务通道进行统一的 通道校正， 但是， 现有技术中的 BBU对收业务通道或发业务通道进行的 通道校正仅能够在单个 RRU 内实现， 尚无法对多个 RRU 中的各条收业 务通道或发业务通道统一进行通道校正。
发明内容 本发明提供一种通道校正装置、 方法及系统， 用于解决无法对多个 RRU中的各条收业务通道或发业务通道统一进行通道校正的问题。
本发明的第一个方面是提供一种通道校正装置，包括：第一通信接口、 信号转换单元和至少两个校正接口；
所述第一通信接口与室内基带单元 BBU通信连接， 用于从所述 BBU 接收基带参考信号；
所述信号转换单元分别与所述第一通信接口和所述至少两个校正接 口连接， 用于将所述基带参考信号转换为射频参考信号， 并将所述射频参 考信号发送给所述至少两个校正接口； 所述至少两个校正接口分别与至少两个耦合单元通信连接， 用于将所 述射频参考信号分别发送给所述至少两个耦合单元。
结合第一个方面提供的通道校正装置， 在第一种可能的实现方式中， 所述通道校正装置还包括与所述信号转换单元连接的至少一个第二通信 接口；
所述至少一个第二通信接口与所述至少两个耦合单元中的一个耦合 单元通信连接， 用于接收所述耦合单元返回的射频反馈信号， 并将所述射 频反馈信号发送给所述信号转换单元；
相应地， 所述信号转换单元还用于， 将所述射频反馈信号转换为基带 反馈信号， 并将所述基带反馈信号发送给所述第一通信接口， 以供所述第 一通信接口将所述基带反馈信号发送给所述 BBU。
结合第一个方面或第一种可能的实现方式， 在第二种可能的实现方式 中， 所述通道校正装置还包括分路或合路单元；
所述分路或合路单元， 分别与所述信号转换单元和所述至少两个校正 接口连接， 用于将信号转换单元输出的射频参考信号分配为至少两路信 号， 分别发送给所述至少两个校正接口。
本发明第二个方面是提供一种通道校正装置， 包括： 第一通信接口、 信号转换单元和至少两个校正接口；
所述至少两个校正接口， 分别与至少两个耦合单元通信连接， 用于接 收所述至少两个耦合单元分别发送的至少两个射频反馈信号；
所述信号转换单元分别与所述至少两个校正接口和所述第一通信接 口连接， 用于将所述至少两个射频反馈信号转换为基带反馈信号， 并将所 述基带反馈信号发送给所述第一通信接口；
所述第一通信接口与 BBU通信连接， 用于将所述基带反馈信号发送 给所述 BBU。
结合第二个方面提供的通道校正装置， 在第一种可能的实现方式中， 所述通道校正装置还包括与所述信号转换单元连接的至少一个第二通信 接口，所述至少一个第二通信接口与所述至少两个耦合单元中的一个耦合 单元通信连接；
相应地， 所述第一通信接口还用于， 从所述 BBU接收基带参考信号； 所述信号转换单元还用于， 将所述基带参考信号转换为射频参考信号， 并 发送给所述至少一个第二通信接口； 所述至少一个第二通信接口用于， 将 所述射频参考信号发送给所述耦合单元，以使所述耦合单元向所述至少两 个校正接口中的一个校正接口返回所述射频参考信号的射频反馈信号。
结合第二个方面或第一种可能的实现方式， 在第二种可能的实现方式 中， 所述通道校正装置还包括分路或合路单元；
所述分路或合路单元， 分别与所述信号转换单元和所述至少两个校正 接口连接，用于将所述至少两个校正接口分别接收到的至少两个射频反馈 信号合并为一路信号， 发送给所述信号转换单元。
本发明第三个方面是提供一种通道校正方法， 包括：
接收 BBU发送的基带参考信号；
将所述基带参考信号转换为射频参考信号；
将所述射频参考信号发送给至少两个耦合单元， 以供所述至少两个耦 合单元返回所述射频参考信号的至少两个射频反馈信号。
结合第三个方面提供的通道校正方法， 在第一种可能的实现方式中， 所述方法还包括：
接收所述至少两个耦合单元中的一个耦合单元返回的射频反馈信号； 将所述射频反馈信号转换为基带反馈信号， 并将所述基带反馈信号发 送给所述 BBU。
本发明第四个方面是提供一种通道校正方法， 包括：
接收至少两个耦合单元发送的至少两个射频反馈信号；
将所述至少两个射频反馈信号转换为基带反馈信号；
将所述基带反馈信号发送给 BBU。
结合第四个方面提供的通道校正方法， 在第一种可能的实现方式中， 所述方法还包括：
接收所述 BBU发送的基带参考信号；
将所述基带参考信号转换为射频参考信号；
将所述射频参考信号发送给所述至少两个耦合单元中的一个耦合单 元， 以使所述耦合单元返回所述射频参考信号的射频反馈信号。
本发明第五个方面是提供一种通道校正系统， 包括至少一个 BBU、 上述通道校正装置、至少一个射频拉远单元 RRU以及至少两个耦合单元； 所述 BBU、 所述通道校正装置、 所述 RRU以及所述耦合单元之间通信连 接。
本发明实施例提供的通道校正装置、 方法及系统， 利用两个或多个校 正接口分别连接两个或多个耦合单元，通过将射频参考信号通过各校正接 口发送给耦合单元， 以使得用于进行通道校正的 BBU, 能够得到 RRU的 收业务通道的信道响应的估计值，或者通过各校正接口从各耦合单元接收 射频反馈信号， 以使得用于进行通道校正的 BBU, 能够得到 RRU的发业 务通道的信道响应的估计值， 从而实现利用该用于进行通道校正的 BBU 对各 RRU的收业务通道或发业务通道进行统一的通道校正。
附图说明 图 1为单个具有外校正接口的 RRU通道校正示意图；
图 2为本发明实施例提供的通道校正装置的结构示意图；
图 3为本发明实施例提供的另一通道校正装置的结构示意图； 图 4为本发明实施例提供的又一通道校正装置的结构示意图； 图 5为本发明实施例提供的又一通道校正装置的结构示意图； 图 6为本发明实施例提供的又一通道校正装置的结构示意图； 图 7a为本发明实施例提供的通道校正系统的结构示意图；
图 7b为本发明实施例提供的另一通道校正系统的结构示意图； 图 8为本发明实施例提供的通道校正方法的流程图；
图 9为本发明实施例提供的另一通道校正方法的流程图。
具体实施方式 图 2为本发明实施例提供的通道校正装置的结构示意图，如图 2所示， 该通道校正装置包括第一通信接口 11、信号转换单元 12和至少两个校正 接口 13。
其中， 所述第一通信接口 11 与 BBU通信连接， 所述信号转换单元 12分别与所述第一通信接口 11和所述至少两个校正接口 13连接， 所述 至少两个校正接口 13分别与至少两个耦合单元通信连接。
具体的， 通道校正装置通过第一通信接口 11与 BBU连接， 通过校正 接口 13与耦合单元连接。通道校正装置上的校正接口 13可以为两个或多 个， 每个校正接口 13均与一个耦合单元连接。
每个耦合单元上均包括一个用于与校正接口 13连接的耦合单元校正 接口，以及一个或多个用于与 RRU的业务接口连接的耦合单元业务接口。 耦合单元可以为设置在通道校正装置与天线之间的独立的耦合盘，还可以 为天线内部的耦合结构。当耦合单元为设置在通道校正装置与天线之间的 独立的耦合盘时， 在耦合单元上还包括用于与天线连接的接口。
两个或多个耦合单元分别通过各自的耦合单元校正接口连接在同一 个通道校正装置的各校正接口 13上， 并且每个耦合单元通过各自的耦合 单元业务接口分别连接在不同的 RRU上。 各 RRU与通道校正装置可以 连接在相同的 BBU上， 也可以连接在不同的 BBU上。
对于收业务通道和发业务通道进行通道校正的方法如下。
具体的收业务通道的通道校正的方法为， 通道校正装置所连接的 BBU 将基带参考信号发送给该通道校正装置； 通道校正装置通过第一通 信接口 11从 BBU接收基带参考信号，并将该基带参考信号发送至通道校 正装置内的信号转换单元 12; 信号转换单元 12将该基带参考信号转换为 射频参考信号，并将该射频参考信号发送至通道校正装置内的两个或多个 校正接口 13 ; 连接有耦合单元的校正接口 13将接收到的射频参考信号发 送给所连接的耦合单元， 也就是说， 通道校正装置与两个或多个耦合单元 连接时， 将射频参考信号分别发送至该两个或多个耦合单元。
每个耦合单元通过耦合单元校正接口从通道校正装置接收到射频参 考信号之后，将射频参考信号中的一部分信号发送给天线或者通过天线发 射出去， 并根据耦合单元的结构， 将射频参考信号中的小部分信号反馈给 所连接的 RRU。 即每个耦合单元将射频反馈信号发送给所连接的 RRU。 其中，耦合单元对接收到的射频参考信号进行发射或者反馈的比例是由耦 合单元的结构决定的。
每个 RRU 通过一个或多个业务接口接收射频反馈信号， 也就是说 RRU 通过一个或多个上行收业务通道分别接收射频反馈信号， 将各上行 收业务通道分别接收到的射频反馈信号转换为基带反馈信号，并将基带反 馈信号发送给其所连接的 BBU。 由于 RRU内部的硬件结构的影响， 使得 信号经过 RRU的上行收业务通道或者下行发业务通道之后发生一定的改 变， 也就是说， 信号经过各条上行收业务通道或者下行发业务通道时， 分 别产生不同的信道响应。
若各 RRU与通道校正装置连接在同一个 BBU上， 则由各 RRU将基 带反馈信号返回给该 BBU, 该 RRU根据接收到的基带反馈信号， 对各上 行收业务通道的信道响应进行估计， 从而能够计算出各 RRU的各条上行 收业务通道的信道响应的估计值。 该 BBU 即作为用于进行通道校正的 BBU, 因此， 该 BBU根据计算出的各估计值， 对各 RRU的各条上行收 业务通道进行统一校正。
若各 RRU与通道校正装置连接在不同的 BBU上， 则各 RRU将基带 反馈信号发送给各自连接的 BBU,各 BBU分别根据接收到的基带反馈信 号， 对所连接的 RRU的各条上行收业务通道的信道响应进行估计。 在与 RRU或通道校正装置连接的 BBU中， 将其中一个 BBU作为用于进行通 道校正的 BBU。 相应地， 与 RRU连接的 BBU在计算出各上行收业务通 道的信道响应的估计值之后，分别将各估计值发送至该用于进行通道校正 的 BBU。 从而， 该用于进行通道校正的 BBU对各 RRU的各条收业务通 道进行统一的通道校正。 其中， 用于进行通道校正的 BBU可以是与通道 校正装置连接的 BBU, 也可以不是和通道校正装置连接的 BBU。
根据对上述两种情况的不同处理方式，由于通道校正装置与两个或多 个耦合单元连接， 各耦合单元分别与 RRU连接， 因此， 无论各 RRU与 通道校正装置是否连接在相同的 BBU上， 用于进行通道校正的 BBU均 能够获知各耦合单元分别连接的 RRU上的各收业务通道的信道响应的估 计值。 从而， 由用于进行通道校正的 BBU对各 RRU的各条收业务通道 进行统一的通道校正。
具体的， BBU 根据基带反馈信号对收业务通道的信道响应进行估计 的方法， 可以釆用与现有技术中类似的实现方式， 此次不再赘述。
具体的发业务通道的通道校正的方法如下。 若各 RRU与通道校正装置连接在同一个 BBU上， 则由该 BBU统一 将基带参考信号发送给各 RRU。
若各 RRU与通道校正装置连接在不同的 BBU上， 则各 RRU所连接 的一个或多个 BBU, 根据预先设置的发送基带参考信号的规则， 利用预 设的时间资源、 频率资源或码域资源将基带参考信号发送给各 RRU。
每个 RRU在接收到基带参考信号后， 将基带参考信号转换为射频参 考信号， 并通过至少一个业务接口， 将射频参考信号发送给所连接的耦合 单元；耦合单元将所接收到的射频参考信号中的一部分发送给天线或者通 过天线发射出去，将射频参考信号中的一小部分通过其上的耦合单元校正 接口， 反馈给所连接的通道校正装置。
由于射频参考信号是 RRU 通过多个业务接口分别发送给耦合单元 的， 即利用多个发业务通道发送的， 因此， 耦合单元通过耦合单元校正接 口返回给通道校正装置的射频反馈信号包括多个发业务通道的射频反馈 信号。
在各耦合单元均进行反馈之后， 该通道校正装置的两个或多个校正接 口 13将分别接收到射频反馈信号， 多个射频反馈信号即包括了多个 RRU 的各发业务通道的射频反馈信号。
通道校正装置将两个或多个校正接口 13分别接收到的射频反馈信号， 经过信号转换单元 12转换为基带反馈信号， 并将基带反馈信号通过第一 通信接口 11发送给所连接的 BBU。由于基带反馈信号中包括了多个 RRU 的各条发业务通道的基带反馈信号， 再根据预先设置的规则按照时分、 频 分或码分的方式， 对基带反馈信号进行相应处理， 分别获得各 RRU的各 条发业务通道的完整的信道响应估计值， 从而该 BBU能够计算出各 RRU 的各条发业务通道的信道响应的估计值。
由于通道校正装置与两个或多个耦合单元连接， 各耦合单元分别与 RRU连接， 因此， 无论各 RRU与通道校正装置是否连接在相同的 BBU 上， 与通道校正装置所连接的 BBU 能够计算出各耦合单元分别连接的 RRU上的各发业务通道的信道响应的估计值。
在与通道校正装置连接的 BBU计算出各 RRU的发业务通道的信道 响应的估计值之后， 可以根据各估计值对各 RRU的各条发业务通道进行 统一的通道校正。 与通道校正装置连接的 BBU还可以将各估计值发送至 另外的用于进行通道校正的 BBU, 以供该 BBU根据各估计值对各 RRU 的各条发业务通道进行统一的通道校正。
具体的， BBU 根据基带反馈信号对发业务通道的信道响应进行估计 的方法， 可以釆用与现有技术中类似的实现方式， 此次不再赘述。
本发明实施例提供的通道校正装置， 利用两个或多个校正接口分别连 接两个或多个耦合单元，通过将射频参考信号通过各校正接口发送给耦合 单元， 以使得用于进行通道校正的 BBU, 能够得到 RRU的收业务通道的 信道响应的估计值， 或者通过各校正接口从各耦合单元接收射频反馈信 号， 以使得用于进行通道校正的 BBU, 能够得到 RRU的发业务通道的信 道响应的估计值，从而实现利用该用于进行通道校正的 BBU对各 RRU的 收业务通道或发业务通道进行统一的通道校正。
图 3为本发明实施例提供的另一通道校正装置的结构示意图， 如图 3 所示， 该通道校正装置还包括至少一个第二通信接口 14。 其中， 至少一 个第二通信接口 14在通道校正装置内部与所述信号转换单元 12连接，在 通道校正装置外部与所述至少两个耦合单元中的一个耦合单元通信连接。
具体的， 在图 2所示的通道校正装置的基础上， 本发明实施例中的通 道校正装置上还可以包括至少一个第二通信接口 14 , 至少一个第二通信 接口 14即为 RRU上用于与耦合单元的耦合单元业务接口连接的至少一个 业务接口。
该通道校正装置可以具有 RRU的功能，但是 RRU仅包括一个校正接 口， 而本发明实施例中的通道校正装置包括至少两个校正接口 13。 其中， 至少两个校正接口 13均连接到信号转换单元 12上，具体在信号转换单元 12与至少两个校正接口 13之间， 实现信号分路或合路的方法， 可以釆用 与现有技术中类似的实现方式， 此次不在赘述。
在通道校正装置包括至少一个第二通信接口 14 的情况下， 该通道校 正装置可以利用该至少一个第二通信接口 14直接与一个耦合单元连接。 也就是说，通道校正装置的至少一个第二通信接口 14所连接的耦合单元， 也连接在该通道校正装置的至少两个校正接口 13 中的一个校正接口 13 上。 该通道校正装置的另外一个或多个校正接口 13可以分别连接其他的 耦合单元， 并且这些耦合单元分别连接在其他的 RRU上。
在本发明实施例中， 将通道校正装置作为一个具有 RRU功能的特殊 RRU, 在收业务通道的通道校正的方法中， 在上述实施例的基础上， 与通 道校正装置的第二通信接口 14连接的耦合单元， 在通过耦合单元的耦合 单元校正接口接收到射频参考信号之后，通过耦合单元的耦合单元业务接 口将射频参考信号的射频反馈信号发送给通道校正装置的第二通信接口 14。 第二通信接口 14 接收到射频反馈信号之后， 经过信号转换单元 12 转换为基带反馈信号， 并通过第一通信接口 11 , 将基带反馈信号发送给 其所连接的 BBU。
具体的， 与通道校正装置的其他校正接口连接的耦合单元分别将射频 反馈信号发送给相应的 RRU的步骤，各 RRU将射频反馈信号转换为基带 反馈信号发送给所连接的 BBU的步骤， 以及后续的操作步骤， 可以参见 上述实施例中的实现方式。
在发业务通道的通道校正的方法中， 在上述实施例的基础上， 不仅各 RRU所连接的一个或多个 BBU, 根据预先设置的发送基带参考信号的规 则， 利用预设的时间资源、 频率资源或码域资源将基带参考信号发送给各 RRU; 与通道校正装置连接的 BBU, 也根据预先设置的发送基带参考信 号的规则， 利用预设的时间资源、 频率资源或码域资源将基带参考信号发 送给该通道校正装置。 通道校正装置接收到基带参考信号之后， 将基带参 考信号转换为射频参考信号， 并通过第二通信接口 14 , 将射频参考信号 发送给所连接的耦合单元；耦合单元将所接收到的射频参考信号中的一小 部分通过其上的耦合单元校正接口， 反馈给所连接的通道校正装置。
由于可以将通道校正装置作为一个特殊的 RRU, 因此通道校正装置 进行收或发业务通道的通道校正的方法，可以参见上述实施例中的实现方 式。
图 4为本发明实施例提供的又一通道校正装置的结构示意图， 如图 4 所示， 该通道校正装置还包括分路或合路单元 15。 其中， 所述分路或合 路单元 15 , 分别与所述信号转换单元 12和所述至少两个校正接口 13连 接。
分路或合路单元， 用于将信号转换单元 12输出的射频参考信号分配 为至少两路信号， 分别发送给所述至少两个校正接口 13 ; 或者， 用于将 所述至少两个校正接口 13分别接收到的至少两个射频反馈信号合并为一 路信号， 发送给所述信号转换单元 12。
具体的， 在通道校正装置内部的信号转换单元 12 与至少两个校正接 口 13之间， 还包括分路或合路单元。 该分路或合路单元为具有一分多或 者多合一功能的分路 /合路电路，具体支路的数量等于校正接口 13的数量。
当信号转换单元 12将基带参考信号转换为射频参考信号之后， 经过 该分路或合路单元， 将射频参考信号分为至少两路信号， 分别通过校正接 口 13发送给耦合单元。
该分路或合路单元可以具有对信号进行分路的功能， 还可以具有功率 补偿的功能， 以使得分路之后的信号在各支路上传输功率， 与分路之前的 信号的传输功率相同。
当至少两个校正接口 13 分别接收到射频反馈信号之后， 经过该分路 或合路单元， 将射频反馈信号合并为一路信号， 发送给信号转换单元 12。
本发明实施例提供的通道校正装置， 通过利用分路或合路单元以及与 支路数量相同的校正接口，实现了将射频参考信号可以同时发送给两个或 多个耦合单元，或者将至少两个校正接口接收到的射频反馈信号合并为一 路信号，以使得用于进行通道校正的 BBU能够对各 RRU的各条收业务通 道或发业务通道进行统一的通道校正。
图 5为本发明实施例提供的又一通道校正装置的结构示意图， 如图 5 所示， 该通道校正装置包括：
处理器 21、 存储器 22、 总线 23、 第一通信接口 24和至少两个校正 接口 25。 处理器 21、存储器 22和通信接口 24之间通过总线 23连接并完 成相互间的通信。
处理器 21可能为单核或多核中央处理单元（Central Processing Unit, CPU ) , 或者为特定集成电路 ( Application Specific Integrated Circuit, ASIC ) , 或者为被配置成实施本发明实施例的一个或多个集成电路。
存储器 22 可以为高速 RAM 存储器， 也可以为非易失性存储器 ( non-volatile memory ) , 例如至少一个磁盘存储器。
存储器 22用于存放程序 221。 具体的， 程序 221 中可以包括程序代 码， 所述程序代码包括计算机操作指令。
第一通信接口 24 , 用于接收 BBU发送的基带参考信号。
处理器 21运行程序 221 , 以执行：
将所述基带参考信号转换为射频参考信号；
将所述射频参考信号发送给至少两个耦合单元， 以供所述至少两个耦 合单元返回所述射频参考信号的至少两个射频反馈信号。
具体的， 本发明实施例中的通道校正装置进行通道校正的方法， 可以 参见上述对应的装置实施例中的实现方式， 此次不再赘述。
图 6为本发明实施例提供的又一通道校正装置的结构示意图， 如图 6 所示， 该通道校正装置包括：
处理器 31、 存储器 32、 总线 33、 第一通信接口 34和至少两个校正 接口 35。 处理器 31、存储器 32和通信接口 34之间通过总线 33连接并完 成相互间的通信。
处理器 31可能为单核或多核中央处理单元（Central Processing Unit, CPU ) , 或者为特定集成电路 ( Application Specific Integrated Circuit, ASIC ) , 或者为被配置成实施本发明实施例的一个或多个集成电路。
存储器 32 可以为高速 RAM 存储器， 也可以为非易失性存储器 ( non-volatile memory ) , 例如至少一个磁盘存储器。
存储器 32用于存放程序 321。 具体的， 程序 321 中可以包括程序代 码， 所述程序代码包括计算机操作指令。
第一通信接口 34 ,用于接收至少两个耦合单元发送的至少两个射频反 馈信号。
处理器 31运行程序 321 , 以执行：
将所述至少两个射频反馈信号转换为基带反馈信号；
将所述基带反馈信号发送给 BBU。
具体的， 本发明实施例中的通道校正装置进行通道校正的方法， 可以 参见上述对应的装置实施例中的实现方式， 此次不再赘述。
图 7a为本发明实施例提供的通道校正系统的结构示意图， 如图 7a所 示，该通道校正系统包括至少一个 BBU1、通道校正装置 2、至少两个 RRU3 和至少两个耦合单元 4。 具体的， 在收业务通道的通道校正的方法中， BBU1将基带参考信号 发送给通道校正装置 2 ; 通道校正装置 2将基带参考信号转换为射频参考 信号， 通过至少两个校正接口， 分别发送给至少两个耦合单元 4 ; 两个耦 合单元 4 分别将射频参考信号的射频反馈信号通过各自的耦合单元业务 接口， 发送给所连接的 RRU3的业务接口； RRU3接收到射频反馈信号之 后， 将射频反馈信号转换为基带反馈信号， 发送给所连接的 BBU1。
若 RRU3与通道校正装置 2连接在同一个 BBU1上， 则 RRU3将射频 反馈信号发送给该 BBU1即可；若 RRU3与通道校正装置 2连接在不同的 BBU上， 则 RRU3将射频反馈信号发送给其所连接的 BBU, 由 BBU根据 射频反馈信号计算出各收业务通道的信道响应的估计值之后，将各收业务 通道的信道响应的估计值发送给与通道校正装置 2所连接的 BBU1 , 由该 BBU1根据各 RRU3的各条收业务通道的信道响应的估计值， 统一进行通 道校正。
其中， RRU3 与通道校正装置 2连接在不同的 BBU上的情况， 在图 5a中未示出。
在发业务通道的通道校正的方法中， 若各 RRU3连接在同一个 BBU1 上， 则该 BBU1 将基带参考信号发送给所连接的至少两个 RRU3 ; 若各 RRU3分别连接在两个或多个 BBU上， 则由各 BBU根据预先设置的发送 基带参考信号的规则， 将基带参考信号发送给各 RRU3。
各 RRU3在接收到基带参考信号之后，将基带参考信号转换为射频参 考信号， 并将射频参考信号发送给所连接的耦合单元 4 ; 各耦合单元 4分 别将其在耦合单元业务接口上接收到的射频参考信号的射频反馈信号，通 过耦合单元校正接口发送至通道校正装置 2的校正接口； 从而， 通道校正 装置 2的至少两个校正接口分别接收到射频反馈信号，并将射频反馈信号 转换为基带反馈信号之后， 发送给所连接的 BBU1。
进而由与通道校正装置所连接的 BBU1 根据所接收到的各基带反馈 信号， 计算出各 RRU3的各条发业务通道的信道响应的估计值， 并根据各 RRU3的各条发业务通道的信道响应的估计值， 统一进行通道校正。 或者 由 BBU1将各估计值发送给用于进行通道校正的 BBU, 以对各 RRU3 的 各条发业务通道进行通道校正。 需要说明的是， 本发明实施例中的 RRU3可以为两个或多个， 相应地 耦合单元 4可以两个或多个，图中仅对 RRU3和耦合单元 4分别为两个的 情况进行了举例说明。
图 7b为本发明实施例提供的另一通道校正系统的结构示意图， 如图 7b所示， 该通道校正系统包括至少一个 BBU1、 通道校正装置 2、 至少一 个 RRU3和至少两个耦合单元 4。
具体的， 在收业务通道的通道校正的方法中， BBU1将基带参考信号 发送给通道校正装置 2 ; 通道校正装置 2将基带参考信号转换为射频参考 信号， 通过至少两个校正接口， 分别发送给至少两个耦合单元 4 ; 两个耦 合单元 4 分别将射频参考信号的射频反馈信号通过各自的耦合单元业务 接口， 发送给所连接的 RRU3 的业务接口， 或者发送给通道校正装置 2 的第二通信接口； RRU3和通道校正装置 2分别在接收到射频反馈信号之 后， 将射频反馈信号转换为基带反馈信号， 发送给各自所连接的 BBU1。
若 RRU3与通道校正装置 2连接在同一个 BBU1上， 则 RRU3和通道 校正装置 2均将射频反馈信号发送给该 BBU1即可；若 RRU3与通道校正 装置 2连接在不同的 BBU上， 则 RRU3将射频反馈信号发送给其所连接 的 BBU, 由该 BBU根据射频反馈信号计算出各收业务通道的信道响应的 估计值之后，将各收业务通道的信道响应的估计值发送给与通道校正装置 2所连接的 BBU1 , 由该 BBU1根据 RRU3和通道校正装置 2的各条收业 务通道的信道响应的估计值， 统一进行通道校正。
或者， 与通道校正装置 2连接的 BBU1和与 RRU3连接的 BBU, 可 以将计算出的估计值发送给用于进行通道校正的 BBU , 以由该 BBU 对 RRU3的收业务通道进行统一校正。
在发业务通道的通道校正的方法中， 若 RRU3和通道校正装置 2连接 在同一个 BBU1 上， 则 BBU1 将基带参考信号发送给所连接的至少一个 RRU3和通道校正装置 2 ;若 RRU3和通道校正装置 2分别连接在两个 BBU 上， 则由各 BBU根据预先设置的发送基带参考信号的规则， 发送基带参 考信号。 RRU3和通道校正装置 2分别在接收到基带参考信号之后， 将基 带参考信号转换为射频参考信号，并将射频参考信号发送给所连接的耦合 单元 4 ; 各耦合单元 4分别将其在耦合单元业务接口上接收到的射频参考 信号的射频反馈信号，通过耦合单元校正接口发送至通道校正装置 2的校 正接口； 从而， 通道校正装置 2的至少两个校正接口分别接收到射频反馈 信号， 并将射频反馈信号转换为基带反馈信号之后， 发送给所连接的 BBU1。
进而由与通道校正装置 2所连接的 BBU1根据所接收到的各基带反馈 信号， 计算出 RRU3 的各条发业务通道的信道响应的估计值， 并根据各 RRU3的各条收业务通道的信道响应的估计值，统一进行通道校正。或者， BBU1将各估计值发送给用于进行通道校正的 BBU , 由该 BBU对 RRU3 的各条发业务通道进行统一的通道校正。
需要说明的是， 本发明实施例中的 RRU3可以为一个或多个， 相应地 耦合单元 4可以两个或多个， 图中仅对 RRU3为一个， 且耦合单元 4为两 个的情况进行了举例说明。
在上述各实施例中所述的预置于 BBU 中的发送基带参考信号的规 则， 可以为各 BBU根据频分、 时分或者码分的方式发送基带参考信号。
具体的， 用于进行通道校正的 BBU根据各 RRU和 /或通道校正装置 的各发业务通道的信道响应的估计值， 进行信道校正的方法如下。
发业务通道的信道响应的估计值为 H ; 其中 k表示 RRU或信道校正 装置中的某一个设备； i表示该设备的某一条发业务通道。 根据需要选择 各 RRU和 /或通道校正装置的一条发业务通道的信道响应的估计值作为基 准值 H ， β = Η 。ΙΗ , 为第 k个设备的第 i条发业务通道的补偿系数。
与通道校正装置连接的 BBU根据各 RRU和 /或通道校正装置的各收 业务通道的信道响应的估计值， 进行信道校正的方法如下。
收业务通道的信道响应的估计值为 H ; 其中 k表示 RRU或信道校正 装置中的某一个设备； i表示该设备的某一条收业务通道。 根据需要选择 各 RRU和 /或通道校正装置的一条收业务通道的信道响应的估计值作为基 准值 H ， β = Ηΰ υ ΰ ΙΗ , 为第 k个设备的第 i条收业务通道的补偿系数。
在计算出各条收业务通道和各条发业务通道的补偿系数之后，对收业 务通道和发业务通道进行补偿的方法如下。
用于进行通道校正的 BBU在接收到收业务通道发送的信号之后， 计 算出信号在该条收业务通道上传输的信道响应，将该信道响应的数值乘以 对应的收业务通道的补偿系数， 得到估算出的对应的发业务通道的权值； 在需要利用该收业务通道对应的发业务通道发送信号时，利用估算出的发 业务通道的权值乘以信号本身， 再乘以对应的发业务通道的补偿系数， 从 而得到经过收业务通道补偿和发业务通道补偿之后的发射信号。 这样，
UE就不会感知到多个 RRU的各条发业务通道的不一致性，即完成了多个 RRU的通道校正过程。
图 8为本发明实施例提供的通道校正方法的流程图， 如图 8所示， 该 方法包括：
101、 接收 BBU发送的基带参考信号。
102、 将所述基带参考信号转换为射频参考信号。
103、 将所述射频参考信号发送给至少两个耦合单元。 执行步骤 103 是为了供所述至少两个耦合单元返回所述射频参考信号的至少两个射频 反馈信号。
进一步地， 所述方法还可以包括：
接收所述至少两个耦合单元中的一个耦合单元返回的射频反馈信号； 将所述射频反馈信号转换为基带反馈信号，并将所述基带反馈信号发送给 所述 BBU。
具体的， 本发明实施例中通道校正装置进行通道校正的方法， 可以参 见上述对应的装置实施例中所述的实现方式， 此次不再赘述。
图 9为本发明实施例提供的另一通道校正方法的流程图，如图 9所示， 该方法包括：
201、 接收至少两个耦合单元发送的至少两个射频反馈信号。
202、 将所述至少两个射频反馈信号转换为基带反馈信号。
203、 将所述基带反馈信号发送给 BBU。
进一步地， 所述方法还可以包括：
接收所述 BBU发送的基带参考信号； 将所述基带参考信号转换为射 频参考信号；将所述射频参考信号发送给所述至少两个耦合单元中的一个 耦合单元， 以使所述耦合单元返回所述射频参考信号的射频反馈信号。
具体的， 本发明实施例中通道校正装置进行通道校正的方法， 可以参 见上述对应的装置实施例中所述的实现方式， 此次不再赘述。 本发明实施例提供的通道校正方法，利用两个或多个校正接口分别连 接两个或多个耦合单元，通过将射频参考信号通过各校正接口发送给耦合 单元， 以使得用于进行通道校正的 BBU, 能够得到 RRU的收业务通道的 信道响应的估计值， 或者通过各校正接口从各耦合单元接收射频反馈信 号， 以使得用于进行通道校正的 BBU, 能够得到 RRU的发业务通道的信 道响应的估计值，从而实现利用该用于进行通道校正的 BBU对各 RRU的 收业务通道或发业务通道进行统一的通道校正。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分 步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算 机可读取存储介质中。 该程序在执行时， 执行包括上述各方法实施例的步 骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存 储程序代码的介质。
最后应说明的是： 以上各实施例仅用以说明本发明的技术方案， 而非 对其限制； 尽管参照前述各实施例对本发明进行了详细的说明， 本领域的 普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进 行修改， 或者对其中部分或者全部技术特征进行等同替换； 而这些修改或 者替换， 并不使相应技术方案的本质脱离本发明各实施例技术方案的范 围。

Claims

权 利 要 求 书
1、 一种通道校正装置， 其特征在于， 包括： 第一通信接口、 信号转换 单元和至少两个校正接口；
所述第一通信接口与室内基带单元 BBU通信连接， 用于从所述 BBU 接收基带参考信号；
所述信号转换单元分别与所述第一通信接口和所述至少两个校正接口 连接， 用于将所述基带参考信号转换为射频参考信号， 并将所述射频参考 信号发送给所述至少两个校正接口；
所述至少两个校正接口分别与至少两个耦合单元通信连接， 用于将所 述射频参考信号分别发送给所述至少两个耦合单元。
2、 根据权利要求 1所述的通道校正装置， 其特征在于， 所述通道校正 装置还包括与所述信号转换单元连接的至少一个第二通信接口；
所述至少一个第二通信接口与所述至少两个耦合单元中的一个耦合单 元通信连接， 用于接收所述耦合单元返回的射频反馈信号， 并将所述射频 反馈信号发送给所述信号转换单元；
相应地， 所述信号转换单元还用于， 将所述射频反馈信号转换为基带 反馈信号， 并将所述基带反馈信号发送给所述第一通信接口， 以供所述第 一通信接口将所述基带反馈信号发送给所述 BBU。
3、 根据权利要求 1或 2所述的通道校正装置， 其特征在于， 所述通道 校正装置还包括分路或合路单元；
所述分路或合路单元， 分别与所述信号转换单元和所述至少两个校正 接口连接，用于将信号转换单元输出的射频参考信号分配为至少两路信号， 分别发送给所述至少两个校正接口。
4、 一种通道校正装置， 其特征在于， 包括： 第一通信接口、 信号转换 单元和至少两个校正接口；
所述至少两个校正接口， 分别与至少两个耦合单元通信连接， 用于接 收所述至少两个耦合单元分别发送的至少两个射频反馈信号；
所述信号转换单元分别与所述至少两个校正接口和所述第一通信接口 连接， 用于将所述至少两个射频反馈信号转换为基带反馈信号， 并将所述 基带反馈信号发送给所述第一通信接口； 所述第一通信接口与 BBU通信连接， 用于将所述基带反馈信号发送给 所述 BBU。
5、 根据权利要求 4所述的通道校正装置， 其特征在于， 所述通道校正 装置还包括与所述信号转换单元连接的至少一个第二通信接口， 所述至少 一个第二通信接口与所述至少两个耦合单元中的一个耦合单元通信连接； 相应地， 所述第一通信接口还用于， 从所述 BBU接收基带参考信号； 所述信号转换单元还用于， 将所述基带参考信号转换为射频参考信号， 并 发送给所述至少一个第二通信接口； 所述至少一个第二通信接口用于， 将 所述射频参考信号发送给所述耦合单元， 以使所述耦合单元向所述至少两 个校正接口中的一个校正接口返回所述射频参考信号的射频反馈信号。
6、 根据权利要求 4或 5所述的通道校正装置， 其特征在于， 所述通道 校正装置还包括分路或合路单元；
所述分路或合路单元， 分别与所述信号转换单元和所述至少两个校正 接口连接， 用于将所述至少两个校正接口分别接收到的至少两个射频反馈 信号合并为一路信号， 发送给所述信号转换单元。
7、 一种通道校正方法， 其特征在于， 包括：
接收 BBU发送的基带参考信号；
将所述基带参考信号转换为射频参考信号；
将所述射频参考信号发送给至少两个耦合单元， 以供所述至少两个耦 合单元返回所述射频参考信号的至少两个射频反馈信号。
8、 根据权利要求 7所述的通道校正方法， 其特征在于， 所述方法还包 括：
接收所述至少两个耦合单元中的一个耦合单元返回的射频反馈信号； 将所述射频反馈信号转换为基带反馈信号， 并将所述基带反馈信号发 送给所述 BBU。
9、 一种通道校正方法， 其特征在于， 包括：
接收至少两个耦合单元发送的至少两个射频反馈信号；
将所述至少两个射频反馈信号转换为基带反馈信号；
将所述基带反馈信号发送给 BBU。
10、 根据权利要求 9 所述的通道校正方法， 其特征在于， 所述方法还 包括：
接收所述 BBU发送的基带参考信号；
将所述基带参考信号转换为射频参考信号；
将所述射频参考信号发送给所述至少两个耦合单元中的一个耦合单 元， 以使所述耦合单元返回所述射频参考信号的射频反馈信号。
11、 一种通道校正系统， 其特征在于， 包括至少一个 BBU、 如权利要 求 1-3 中任一所述的通道校正装置或者如权利要求 4-6 中任一所述的通道 校正装置、至少一个射频拉远单元 RRU以及至少两个耦合单元；所述 BBU、 所述通道校正装置、 所述 RRU以及所述耦合单元之间通信连接。
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