CN107517503B - Processing device, BBU, RRU and antenna correction method - Google Patents
Processing device, BBU, RRU and antenna correction method Download PDFInfo
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Abstract
The embodiment of the invention discloses a processing device, a BBU, an RRU and an antenna correction method, wherein the processing device comprises: a first processing unit and a second processing unit; the first processing unit is located in a Base Band Unit (BBU), the second processing unit is located in a Radio Remote Unit (RRU), the first processing unit and the second processing unit are connected through an interface between the BBU and the RRU, the interface is used for transmitting downlink data after resource unit (RE) mapping is performed on the BBU and before downlink antenna correction is performed on the RRU, and uplink data after uplink antenna correction is performed on the RRU and before RE inverse mapping is performed on the BBU.
Description
Technical Field
The invention relates to the antenna correction technology in the field of wireless communication, in particular to a processing device, a BBU (baseband processing unit), an RRU (remote radio unit) and an antenna correction method.
Background
The large-scale antenna array system (Massive MIMO) is one of the key technologies of the fifth generation (5G) mobile communication in the future, and the Massive MIMO technology can not only improve the channel capacity, but also effectively suppress the intra-cell interference and the inter-cell interference. Antenna correction is the basis of Massive MIMO, the core algorithm of intelligent antennas requires the system to accurately obtain the array manifold composed of all intelligent antennas, and in the actual large-scale antenna array system, each intelligent antenna may have a certain error, so that the uplink antenna and the downlink antenna which generate the error need to be corrected, thereby each intelligent antenna can effectively control the beam direction and shape, and intelligent transmission and intelligent reception are realized.
The distributed Base station is also a communication Base station mainly adopted in future 5G mobile communication, and is composed of a Base Band Unit (BBU) and a Remote Radio Unit (RRU). The distributed base station is a base station combination which can be flexibly installed, and data interaction is carried out between the BBU and the RRU through an interface. Fig. 1 is a schematic diagram of a composition structure of a conventional BBU and RRU, and as shown in fig. 1, the conventional BBU and RRU are divided by a digital intermediate frequency module in which baseband data enters the RRU, so that data transmitted on an interface between the BBU and the RRU includes not only I data and Q data before being processed by the digital intermediate frequency module, but also IQ data for short; but also an antenna correction sequence for correcting the respective antenna to be corrected.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
according to the functional division of the BBU and the RRU in the existing distributed base station, the bandwidth requirement of an interface between the BBU and the RRU for data transmission is very large, so that a large amount of optical fiber resources are occupied, and great hidden danger is brought to the stability of the BBU and the RRU.
Disclosure of Invention
In order to solve the existing technical problems, embodiments of the present invention provide a processing apparatus, a BBU, an RRU, and an antenna correction method, which can significantly reduce data throughput on an interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU, and increasing the stability of the BBU and the RRU.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
an embodiment of the present invention provides a processing apparatus, where the processing apparatus includes: a first processing unit and a second processing unit; wherein,
the first processing unit is located in the BBU, the second processing unit is located in the RRU, the first processing unit and the second processing unit are connected through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after resource unit RE mapping is performed on the BBU and before downlink antenna correction is performed on the RRU, and uplink data after uplink antenna correction is performed on the RRU and before RE inverse mapping is performed on the BBU.
In the above embodiment, the first processing unit includes: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; the second processing unit includes: an antenna correction module and an Inverse Fast Fourier Transform (IFFT) module for a downlink direction; wherein,
the coding module is configured to perform channel coding on downlink data received from an MAC entity preset in the BBU, and send the channel-coded downlink data to the baseband modulation module;
the baseband modulation module is configured to perform baseband modulation on the downlink data after channel coding, and send the downlink data after baseband modulation to the resource mapping module;
the resource mapping module is configured to perform mapping of resource unit RE on the downlink data after baseband modulation, and send the mapped downlink data to the antenna correction module through the interface;
the antenna correction module is used for performing downlink antenna correction on the mapped downlink data and sending the corrected downlink data to the IFFT module;
and the IFFT module is used for performing inverse fast Fourier transform on the corrected downlink data, adding a cyclic prefix and sending the downlink data added with the cyclic prefix to a digital intermediate frequency module preset in the RRU.
In the above embodiment, the first processing unit further includes: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; the second processing unit further comprises: an antenna correction module and a Fast Fourier Transform (FFT) module used for the uplink direction; wherein,
the FFT module is used for removing a cyclic prefix from the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data after the fast Fourier transform to the antenna correction module;
the antenna correction module is used for performing uplink antenna correction on the uplink data after the fast fourier transform and sending the corrected uplink data to the resource inverse mapping module through the interface;
the resource inverse mapping module is configured to perform inverse mapping of an RE on the corrected uplink data, and send the inverse mapped uplink data to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data after inverse mapping, and sending the uplink data after baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
The embodiment of the invention also provides a BBU, which comprises: the first processing unit is connected with the RRU through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
In the above embodiment, the first processing unit includes: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; wherein,
the coding module is configured to perform channel coding on the downlink data received from the MAC entity, and send the downlink data after the channel coding to the baseband modulation module;
the baseband modulation module is configured to perform baseband modulation on the downlink data after channel coding, and send the downlink data after baseband modulation to the resource mapping module;
and the resource mapping module is used for performing RE mapping on the downlink data after baseband modulation, and sending the mapped downlink data to the RRU through the interface.
In the above embodiment, the first processing unit further includes: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; wherein,
the resource inverse mapping module is configured to perform RE inverse mapping on the received uplink data sent by the RRU, and send the inverse mapped uplink data to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data after inverse mapping, and sending the uplink data after baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
An embodiment of the present invention further provides an RRU, where the RRU includes: the second processing unit is connected with the BBU through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after the RE mapping is performed on the BBU and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
In the above embodiment, the second processing unit includes: an antenna correction module and an IFFT module used for the downlink direction; wherein,
the antenna correction module is used for performing downlink antenna correction on the downlink data sent by the BBU and sending the corrected downlink data to the IFFT module;
and the IFFT module is used for performing inverse fast Fourier transform on the corrected downlink data, adding a cyclic prefix and sending the downlink data added with the cyclic prefix to the digital intermediate frequency module.
In the above embodiment, the second processing unit further includes: an antenna correction module and an FFT module used for the uplink direction; wherein,
the FFT module is used for removing a cyclic prefix from the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data after the fast Fourier transform to the antenna correction module;
and the antenna correction module is used for performing uplink antenna correction on the uplink data subjected to the fast Fourier transform and sending the corrected uplink data to the BBU.
The embodiment of the invention also provides an antenna correction method, which comprises the following steps:
a second processing unit in the RRU sends antenna correction sequences corresponding to the antennas to be corrected to the radio frequency unit;
the radio frequency unit returns the received antenna correction sequences to the second processing unit through a preset coupling network;
and the second processing unit corrects each antenna to be corrected according to each antenna correction sequence returned by the radio frequency unit.
In the above embodiment, the antenna correction sequence includes: an uplink correction sequence and a downlink correction sequence.
In the foregoing embodiment, the correcting, by the second processing unit, each antenna to be corrected according to each antenna correction sequence returned by the radio frequency unit includes:
the second processing unit performs uplink antenna correction on each uplink antenna to be corrected according to each uplink correction sequence returned by the radio frequency unit;
and the second processing unit performs downlink antenna correction on each downlink antenna to be corrected according to each downlink correction sequence returned by the radio frequency unit.
Therefore, in the technical solution of the embodiment of the present invention, the first processing unit in the processing apparatus is located in the BBU, the second processing unit is located in the RRU, and the first processing unit and the second processing unit are connected through an interface between the BBU and the RRU, and the interface may be only used for transmitting downlink data after the RE mapping is performed on the BBU and before the downlink antenna correction is performed on the RRU, and uplink data after the uplink antenna correction is performed on the RRU and before the RE inverse mapping is performed on the BBU, and does not need to transmit an antenna correction sequence, and also does not need to transmit redundant downlink data caused by IFFT and redundant uplink data caused by FFT. That is to say, in the technical solution provided in the embodiment of the present invention, the functions of the processing apparatus in the existing BBU may be newly divided between the BBU and the RRU, that is: and arranging the second processing unit in the existing BBU in the RRU. Therefore, the technical scheme provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU; moreover, the method is simple and convenient to realize, convenient to popularize and wide in application range.
Drawings
FIG. 1 is a schematic diagram of the existing BBU and RRU components;
FIG. 2 is a schematic diagram of a processing apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the composition structure of BBU in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a RRU in an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating an implementation of the antenna calibration method according to the embodiment of the present invention.
Detailed Description
In various embodiments of the present invention, fig. 2 is a schematic structural diagram of a processing apparatus in an embodiment of the present invention, and as shown in fig. 2, the processing apparatus includes: a first processing unit and a second processing unit; wherein,
the first processing unit is located in the BBU, the second processing unit is located in the RRU, the first processing unit and the second processing unit are connected through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after the RE mapping is performed on the BBU and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
The large-scale antenna is an important development direction in the future 5G communication, but with the increase of the number of antennas, according to the functional division of the BBU and the RRU in the existing distributed base station, the bandwidth requirement of the interface between the BBU and the RRU for data transmission will be very large. Taking an array system with 32 antennas as an example, assuming that the bandwidth occupied by each antenna is 20MHz, the sampling rate is 30.72M/s, the bit width of the I signal and the bit width of the Q signal are 15 bits, the interface rate between the BBU and the RRU is: interface rate (bit width of I data + bit width of Q data) × sampling rate × number of antennas × 10/8 × 16/15, about 40 Gbps; wherein 10/8 is the optical interface redundancy due to coding, and 16/15 is the redundancy due to control words.
However, in the above calculation, only the interface rate conditions of the BBU and the RRU in the single-carrier single cell are considered, and the 5G mobile communication will be a multi-carrier multi-cell in the future, and the requirement for the interface rate between the BBU and the RRU will be greater in the multi-carrier cell, so that according to the functional division of the BBU and the RRU in the existing distributed base station, the interface between the BBU and the RRU not only needs to occupy a large amount of optical fiber resources, but also makes the implementation of the multi-antenna technology very difficult, and brings great hidden danger to the stability of the BBU and the RRU.
In the specific embodiment of the present invention, the functions of the processing device in the existing BBU may be divided between the BBU and the RRU again, that is: the second processing unit in the existing BBU is arranged in the RRU, so that an interface between the BBU and the RRU can be only used for transmitting downlink data after the BBU is subjected to RE mapping and before the RRU is subjected to downlink antenna correction, and uplink data after the RRU is subjected to uplink antenna correction and before the BBU is subjected to RE inverse mapping, an antenna correction sequence does not need to be transmitted, and redundant downlink data brought by IFFT and redundant uplink data brought by FFT do not need to be transmitted. Therefore, the technical scheme provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU.
Specifically, the first processing unit may include: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; the second processing unit includes: an antenna correction module and an IFFT module used for the downlink direction; wherein,
the coding module is used for carrying out channel coding on the downlink data sent by the MAC entity preset in the BBU and sending the downlink data subjected to the channel coding to the baseband modulation module;
the base band modulation module is used for carrying out base band modulation on the downlink data after channel coding and sending the downlink data after the base band modulation to the resource mapping module;
the resource mapping module is used for mapping resource units (RE) on the downlink data modulated by the baseband and sending the mapped downlink data to the antenna correction module through an interface;
the antenna correction module is used for carrying out downlink antenna correction on the mapped downlink data and sending the corrected downlink data to the IFFT module;
and the IFFT module is used for performing inverse fast Fourier transform on the corrected downlink data, adding a cyclic prefix and sending the downlink data added with the cyclic prefix to a digital intermediate frequency module preset in the RRU.
By the coding module, the baseband modulation module and the resource mapping module for the downlink direction in the first processing unit, and the antenna correction module and the IFFT module for the downlink direction in the second processing unit, the downlink data received from the MAC entity in the BBU can be subjected to channel coding, baseband modulation, RE mapping, downlink antenna correction, inverse fast fourier transform, and cyclic prefix addition, and then sent to the digital intermediate frequency module in the RRU.
In an embodiment of the present invention, the first processing unit may further include: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; the second processing unit further comprises: an antenna correction module and an FFT module used for the uplink direction; wherein,
the FFT module is used for removing cyclic prefix of the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data after the fast Fourier transform to the antenna correction module;
the antenna correction module is used for performing uplink antenna correction on the uplink data subjected to the fast Fourier transform and sending the corrected uplink data to the resource inverse mapping module through the interface;
the resource inverse mapping module is used for carrying out inverse mapping of RE on the corrected uplink data and sending the inverse mapped uplink data to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data subjected to inverse mapping and sending the uplink data subjected to baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
Through the decoding module, the baseband demodulation module and the resource inverse mapping module which are used in the uplink direction in the first processing unit, and the antenna correction module and the FFT module which are used in the uplink direction in the second processing unit, the uplink data which is sent by the digital intermediate frequency module can be respectively subjected to cyclic prefix removal, fast Fourier transform and uplink antenna correction, as well as inverse mapping, channel estimation, equalization, baseband demodulation and decoding of RE, and then sent to the MAC entity in the BBU.
It should be noted that, in an embodiment of the present invention, the downlink direction may be: the direction from the BBU to the RRU; the upstream direction may be: RRU direction to BBU.
The processing device of the embodiment of the invention can divide the functions of the processing device in the prior BBU into the BBU and the RRU again, namely: the second processing unit in the existing BBU is set in the RRU, so the interface between the BBU and the RRU can be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data caused by IFFT and redundant uplink data caused by FFT. Therefore, the technical scheme provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU; moreover, the method is simple and convenient to realize, convenient to popularize and wide in application range.
Fig. 3 is a schematic structural diagram of a BBU in an embodiment of the present invention, and as shown in fig. 3, the BBU may include: the system comprises a service protocol entity, an MAC entity and a first processing unit; the first processing unit is connected with the RRU through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
In the specific embodiment of the present invention, the functions of the processing device in the existing BBU may be newly divided between the BBU and the RRU, so that the BBU may include only: a service protocol entity, a MAC entity and a first processing unit, but not comprising: the second processing unit, therefore, the interface between the BBU and the RRU may be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data due to IFFT and redundant uplink data due to FFT.
Specifically, the first processing unit may further include: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; wherein,
the encoding module is used for carrying out channel encoding on the downlink data sent by the MAC entity and sending the downlink data subjected to the channel encoding to the baseband modulation module;
the base band modulation module is used for carrying out base band modulation on the downlink data after channel coding and sending the downlink data after the base band modulation to the resource mapping module;
and the resource mapping module is used for mapping the RE to the downlink data modulated by the baseband and sending the transmitted downlink data to the RRU through an interface.
The first processing unit in the BBU can perform channel coding, baseband modulation, and RE mapping on the received downlink data sent by the MAC entity, and then send the mapped downlink data to the RRU through the interface between the BBU and the RRU.
In an embodiment of the present invention, the first processing unit may further include: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; wherein,
the resource inverse mapping module is used for carrying out inverse mapping of RE on the received uplink data sent by the RRU and sending the uplink data after inverse mapping to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data subjected to inverse mapping and sending the uplink data subjected to baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
The BBU proposed by the embodiment of the present invention may include only: a service protocol entity, a MAC entity and a first processing unit, but not comprising: a second processing unit. That is to say, in the technical solution provided in the embodiment of the present invention, the functions of the processing apparatus in the existing BBU may be newly divided between the BBU and the RRU, that is: the second processing unit in the existing BBU is set in the RRU, so the interface between the BBU and the RRU can be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data caused by IFFT and redundant uplink data caused by FFT. Therefore, the BBU provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU; moreover, the method is simple and convenient to realize, convenient to popularize and wide in application range.
Fig. 4 is a schematic structural diagram of a RRU in the embodiment of the present invention, and as shown in fig. 4, the RRU may include: the second processing unit, the digital intermediate frequency unit and the radio frequency unit; the second processing unit is connected with the BBU through an interface between the BBU and the RRU, wherein the interface is used for transmitting downlink data after the RE mapping is performed on the BBU and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
In the specific embodiment of the present invention, the functions of the processing device in the existing BBU may be newly divided between the BBU and the RRU, so that the BBU may include only: a service protocol entity, a MAC entity and a first processing unit, but not comprising: the second processing unit, therefore, the interface between the BBU and the RRU may be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data due to IFFT and redundant uplink data due to FFT.
Specifically, the second processing unit may further include: an antenna correction module and an IFFT module used for the downlink direction; wherein,
the antenna correction module is used for performing downlink antenna correction on the downlink data sent by the received BBU and sending the downlink data after antenna correction to the IFFT module;
and the IFFT module is used for performing inverse fast Fourier transform on the downlink data after the antenna correction, adding a cyclic prefix and sending the downlink data after the cyclic prefix is added to the digital intermediate frequency module.
By the second processing unit in the RRU, downlink antenna correction, inverse fast fourier transform, and cyclic prefix addition can be performed on the downlink data sent by the received BBU, and then the downlink data with the cyclic prefix added is sent to the digital intermediate frequency module.
In an embodiment of the present invention, the second processing unit may further include: an antenna correction module and an FFT module used for the uplink direction; wherein,
the FFT module is used for removing cyclic prefix of the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data after the fast Fourier transform to the antenna correction module;
and the antenna correction module is used for performing uplink antenna correction on the uplink data subjected to the fast Fourier transform and sending the uplink data subjected to the antenna correction to the BBU.
The RRU provided by the embodiment of the present invention may include: the second processing unit, digital intermediate frequency unit and radio frequency unit. That is to say, in the technical solution provided in the embodiment of the present invention, the functions of the processing apparatus in the existing BBU may be newly divided between the BBU and the RRU, that is: the second processing unit in the existing BBU is set in the RRU, so the interface between the BBU and the RRU can be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data caused by IFFT and redundant uplink data caused by FFT. Therefore, the RRU provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU; moreover, the method is simple and convenient to realize, convenient to popularize and wide in application range.
In practical application, the first processing unit and the second processing unit can be implemented by a Central Processing Unit (CPU), a microprocessor unit (MPU), a Digital Signal Processor (DSP), or a Field Programmable Gate Array (FPGA), etc. located in the BBU and the RRU.
Fig. 5 is a schematic flow chart illustrating an implementation of the antenna calibration method in the embodiment of the present invention, and as shown in fig. 5, the antenna calibration method may include the following steps:
In a specific embodiment of the present invention, an antenna correction sequence corresponding to each antenna to be corrected may be determined in advance. Wherein the antenna correction sequence may include: an uplink correction sequence and a downlink correction sequence.
In this step, the second processing unit in the RRU may send an uplink correction sequence corresponding to each uplink antenna to be corrected to the radio frequency unit; and the downlink correction sequence corresponding to each downlink antenna to be corrected can be sent to the radio frequency unit. Specifically, in the specific embodiment of the present invention, the antenna correction sequence corresponding to each antenna to be corrected may be sent to the radio frequency unit through the antenna correction module in the second processing unit.
Preferably, in an embodiment of the present invention, before the second processing unit in the RRU sends the uplink correction sequence corresponding to each uplink antenna to be corrected to the radio frequency unit, the method may further include the following steps:
step a, an antenna correction management entity in the BBU sends an antenna correction instruction to an antenna correction management entity in the RRU.
In this step, the antenna correction management entity in the BBU may send an antenna correction indication to the antenna correction management entity in the RRU through the control word.
And b, the antenna correction management entity in the RRU sends an antenna correction command to the second processing unit.
In a specific embodiment of the present invention, after receiving an antenna correction instruction sent by an antenna correction management entity in the BBU, an antenna correction management entity in the RRU may send an antenna correction command to the second processing unit. Specifically, the antenna correction command may include: an uplink antenna correction command and a downlink antenna correction command. Preferably, the uplink antenna calibration command may carry an antenna identifier of each uplink antenna to be calibrated, and is used to indicate which uplink antennas need to be calibrated by the antenna calibration module; preferably, the downlink antenna correction command may carry an antenna identifier of each downlink antenna to be corrected, so as to indicate which downlink antennas need to be corrected by the antenna correction module.
In an embodiment of the present invention, after receiving the uplink calibration sequence or the downlink calibration sequence sent by the second processing unit, the rf unit may respectively return the uplink calibration sequence and the downlink calibration sequence to the second processing unit through a preset coupling network.
In a specific embodiment of the present invention, the second processing unit may correct each uplink antenna to be corrected according to the uplink correction sequence returned by the radio frequency unit; and correcting each downlink antenna to be corrected according to the downlink correction sequence returned by the radio frequency unit.
Specifically, the second processing unit may correct each antenna to be corrected by using an existing antenna correction method according to an antenna correction sequence returned by the radio frequency unit. For example, the second processing unit may respectively calculate uplink delay compensation values of the uplink antennas to be corrected according to the uplink correction sequence returned by the radio frequency unit, and then perform uplink antenna correction on the uplink antennas to be corrected by using the uplink delay compensation values; preferably, the second processing unit may further calculate downlink delay compensation values of the downlink antennas to be corrected according to the downlink correction sequence returned by the radio frequency unit, and then perform downlink antenna correction on the downlink antennas to be corrected by using the downlink delay compensation values.
Preferably, in the embodiment of the present invention, after completing uplink antenna calibration on all uplink antennas to be calibrated, the second processing unit may further send a response message for reporting completion of uplink antenna calibration to an antenna calibration management entity in the RRU; preferably, after completing downlink antenna calibration for all downlink antennas to be calibrated, the second processing unit may further send a response message for reporting completion of downlink antenna calibration to a user to an antenna calibration management entity in the RRU.
The antenna correction method provided by the embodiment of the invention can finish the correction of each antenna to be corrected through the second processing unit in the RRU. Because the second processing unit is arranged in the RRU, the interface between the BBU and the RRU can be used only for transmitting the downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and the uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping, without transmitting an antenna correction sequence, and without transmitting redundant downlink data caused by IFFT and redundant uplink data caused by FFT. Therefore, the technical scheme provided by the embodiment of the invention can obviously reduce the data throughput on the interface between the BBU and the RRU, thereby effectively reducing the cost of data transmission between the BBU and the RRU and increasing the stability of the BBU and the RRU; moreover, the method is simple and convenient to realize, convenient to popularize and wide in application range.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (12)
1. A processing apparatus, characterized in that the processing apparatus comprises: a first processing unit and a second processing unit; wherein,
the first processing unit is located in a Base Band Unit (BBU), the second processing unit is located in a Radio Remote Unit (RRU), the first processing unit and the second processing unit are connected through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after resource unit (RE) mapping is performed on the BBU and before downlink antenna correction is performed on the RRU, and uplink data after uplink antenna correction is performed on the RRU and before RE inverse mapping is performed on the BBU;
the second processing unit comprises an antenna correction module used for the downlink direction and the uplink direction;
the antenna correction module is used for performing downlink antenna correction on the mapped downlink data and sending the corrected downlink data to the IFFT module; and the interface is also used for performing uplink antenna correction on the uplink data after the fast Fourier transform and sending the corrected uplink data to the resource inverse mapping module through the interface.
2. The processing apparatus according to claim 1, wherein the first processing unit comprises: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; the second processing unit further comprises: an Inverse Fast Fourier Transform (IFFT) module; wherein,
the coding module is configured to perform channel coding on downlink data received from an MAC entity preset in the BBU, and send the channel-coded downlink data to the baseband modulation module;
the baseband modulation module is configured to perform baseband modulation on the downlink data after channel coding, and send the downlink data after baseband modulation to the resource mapping module;
the resource mapping module is configured to perform mapping of resource unit RE on the downlink data after baseband modulation, and send the mapped downlink data to the antenna correction module through the interface;
and the IFFT module is used for performing inverse fast Fourier transform on the corrected downlink data, adding a cyclic prefix and sending the downlink data added with the cyclic prefix to a digital intermediate frequency module preset in the RRU.
3. The processing apparatus according to claim 1, wherein the first processing unit further comprises: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; the second processing unit further comprises: a Fast Fourier Transform (FFT) module; wherein,
the FFT module is used for removing a cyclic prefix from the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data after the fast Fourier transform to the antenna correction module;
the resource inverse mapping module is configured to perform inverse mapping of an RE on the corrected uplink data, and send the inverse mapped uplink data to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data after inverse mapping, and sending the uplink data after baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
4. A BBU, comprising: the RRU comprises a service protocol entity, an MAC entity and a first processing unit, and is characterized in that the first processing unit is connected with the RRU through an interface between the BBU and the RRU, wherein the interface is used for transmitting downlink data after the BBU performs RE mapping and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping.
5. The BBU of claim 4, wherein the first processing unit includes: the system comprises a coding module, a baseband modulation module and a resource mapping module which are used for the downlink direction; wherein,
the coding module is configured to perform channel coding on the downlink data received from the MAC entity, and send the downlink data after the channel coding to the baseband modulation module;
the baseband modulation module is configured to perform baseband modulation on the downlink data after channel coding, and send the downlink data after baseband modulation to the resource mapping module;
and the resource mapping module is used for performing RE mapping on the downlink data after baseband modulation, and sending the mapped downlink data to the RRU through the interface.
6. The BBU of claim 4, wherein the first processing unit further comprises: the decoding module, the baseband demodulation module and the resource inverse mapping module are used for the uplink direction; wherein,
the resource inverse mapping module is configured to perform RE inverse mapping on the received uplink data sent by the RRU, and send the inverse mapped uplink data to the baseband demodulation module;
the baseband demodulation module is used for performing channel estimation, equalization and baseband demodulation on the uplink data after inverse mapping, and sending the uplink data after baseband demodulation to the decoding module;
and the decoding module is used for decoding the uplink data demodulated by the baseband and sending the decoded uplink data to the MAC entity.
7. An RRU, comprising: the second processing unit is connected with the BBU through an interface between the BBU and the RRU, and the interface is used for transmitting downlink data after the RE mapping is performed on the BBU and before the RRU performs downlink antenna correction, and uplink data after the RRU performs uplink antenna correction and before the BBU performs RE inverse mapping;
the second processing unit comprises an antenna correction module for the downlink direction;
the antenna correction module is used for performing downlink antenna correction on the downlink data sent by the BBU and sending the corrected downlink data to the IFFT module; and the uplink antenna correction module is also used for performing uplink antenna correction on the uplink data subjected to the fast Fourier transform and sending the corrected uplink data to the BBU.
8. The RRU of claim 7, wherein the second processing unit further comprises: an IFFT module; wherein,
and the IFFT module is used for performing inverse fast Fourier transform on the corrected downlink data, adding a cyclic prefix and sending the downlink data added with the cyclic prefix to the digital intermediate frequency module.
9. The RRU of claim 7, wherein the second processing unit further comprises: an antenna correction module and an FFT module used for the uplink direction; wherein,
and the FFT module is used for removing a cyclic prefix from the received uplink data sent by the digital intermediate frequency module, performing fast Fourier transform, and sending the uplink data subjected to fast Fourier transform to the antenna correction module.
10. An antenna calibration method, the method comprising:
a second processing unit in the RRU sends antenna correction sequences corresponding to the antennas to be corrected to the radio frequency unit;
the radio frequency unit returns the received antenna correction sequences to the second processing unit through a preset coupling network;
and the second processing unit corrects each antenna to be corrected according to each antenna correction sequence returned by the radio frequency unit.
11. The method of claim 10, wherein the antenna correction sequence comprises: an uplink correction sequence and a downlink correction sequence.
12. The method of claim 11, wherein the second processing unit performing calibration on each antenna to be calibrated according to each antenna calibration sequence returned by the radio frequency unit comprises:
the second processing unit performs uplink antenna correction on each uplink antenna to be corrected according to each uplink correction sequence returned by the radio frequency unit;
and the second processing unit performs downlink antenna correction on each downlink antenna to be corrected according to each downlink correction sequence returned by the radio frequency unit.
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| PCT/CN2017/087093 WO2017215467A1 (en) | 2016-06-17 | 2017-06-02 | Processing device, bbu, rru, and antenna correction method |
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| CN110611628B (en) * | 2018-06-15 | 2023-03-24 | 上海诺基亚贝尔股份有限公司 | Signal processing method, network device, and computer-readable storage medium |
| CN112511233A (en) * | 2019-09-16 | 2021-03-16 | 中兴通讯股份有限公司 | Radio frequency remote device, active antenna and base station system |
| CN113055058B (en) * | 2019-12-27 | 2023-09-08 | 中兴通讯股份有限公司 | Base station, multi-antenna receiving and transmitting device and control method thereof |
| CN114079517B (en) * | 2020-08-20 | 2024-01-26 | 北京佰才邦技术股份有限公司 | Antenna calibration method, device and control equipment |
| CN114885343B (en) * | 2022-06-17 | 2023-04-28 | 中国联合网络通信集团有限公司 | Communication method and device and storage medium |
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| CN101257343B (en) * | 2008-01-29 | 2011-12-28 | 北京北方烽火科技有限公司 | Data synchronization method for antenna to calibrate radio frequency far-end unit terminal |
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