CN107306148B - Signal processing method, base station and terminal under digital-analog domain hybrid architecture - Google Patents
Signal processing method, base station and terminal under digital-analog domain hybrid architecture Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Abstract
The invention discloses a signal processing method, a base station and a terminal under a digital analog domain hybrid architecture, wherein the method comprises the following steps: sending system information and control information to a terminal according to high-level configuration; receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal; sending a downlink reference signal to a terminal, and receiving channel information sent by the terminal; scheduling and pairing the terminal according to the channel information, and sending data to the terminal; and determining whether to perform HARQ processing according to the confirmation information or the non-confirmation information sent by the terminal.
Description
Technical Field
The present invention relates to wireless transmission technologies, and in particular, to a signal processing method, a base station, and a terminal under a digital-analog domain hybrid architecture.
Background
In order to meet the service increase demand and the service quality, the IMT-2020-oriented 5G mobile communication network needs to realize 1000 times of network capacity increase, and at the same time, reduces the energy consumption of the base station and improves the operation efficiency. The creation of green radio access networks is a key direction for future networks. Based on the random matrix theory, it can be proved that when the number of antennas of the base station far exceeds that of the terminals, the channels between each terminal tend to be orthogonal, and a plurality of users can perform interference-free transmission on the same time-frequency resource. Meanwhile, the large-scale antenna also brings huge array gain, and the energy consumption overhead of the system is greatly reduced. The large-scale antenna (Massive MIMO) technology plays a key role in improving network capacity, reducing network energy consumption and promoting network sustainable development.
The multi-antenna technology is fully applied to the current 4G system, such as Long Term Evolution (LTE)/evolved Long Term Evolution (LTE-a). On the one hand, the number of transceiving antennas is increasing, for example, the related legislation of the current third Generation Partnership Project (3 GPP) on Full-dimensional multiple-Input multiple-Output (FD-MIMO) can support multiple-Input multiple-Output (MIMO) transmission of 64 antenna ports at most; on the other hand, the transmission mode of MIMO is also more diversified, such as transmit diversity, spatial multiplexing, beamforming, multi-user MIMO, and the like. However, in any transmission mode, the processing of multiple antennas is currently performed in the digital domain, as shown in fig. 1.
It is foreseen that: with the continuous increase of the number of antennas, if the signal processing of multiple antennas is performed in the digital domain, it will bring about a very large cost overhead and complexity of algorithm processing, especially in high-frequency band communication systems, such as millimeter wave communication. Therefore, digital domain and analog domain hybrid architecture multi-antenna systems gradually receive much attention. How to handle the signal transmission of the digital domain and analog domain hybrid architecture multi-antenna system is a problem to be solved.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a signal processing method, a base station, and a terminal under a digital-analog domain hybrid architecture.
The signal processing method under the digital-analog domain hybrid architecture provided by the embodiment of the invention comprises the following steps:
sending system information and control information to a terminal according to high-level configuration;
receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal;
sending a downlink reference signal to a terminal, and receiving channel information sent by the terminal;
scheduling and pairing the terminal according to the channel information, and sending data to the terminal;
and determining whether to perform Hybrid Automatic Repeat reQuest (HARQ) processing according to the confirmation information or the non-confirmation information sent by the terminal.
In the embodiment of the present invention, the method further includes:
and adding analog domain code word indication signaling in the control information according to an analog domain beam selection and feedback mode.
In this embodiment of the present invention, the adding of the analog domain codeword indication signaling to the control information includes:
setting a new Downlink Control Information (DCI) format in a Control channel, and adding a code word indicating signaling currently used by an analog domain through the new DCI format.
In the embodiment of the present invention, the method further includes: performing mixed pre-coding on an analog domain and a digital domain; wherein the content of the first and second substances,
updating the pre-coding matrix of the analog domain under a preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; alternatively, the first and second electrodes may be,
the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode.
In this embodiment of the present invention, the sending a downlink reference signal to a terminal includes:
and sending the downlink reference signal to an antenna array through an antenna port, and sending the downlink reference signal through the antenna array.
Another embodiment of the present invention provides a signal processing method under a digital-analog domain hybrid architecture, including:
receiving system information and control information sent by a base station;
transmitting digital domain beam indication feedback information and analog domain beam indication feedback information to a base station;
receiving a downlink reference signal sent by a base station, performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to the base station;
receiving data sent by a base station, and demodulating the data according to the control information; and sending confirmation information or non-confirmation information to the base station according to the demodulation result.
In the embodiment of the present invention, the method further includes:
estimating a downlink channel based on each antenna array to obtain an original spatial channel;
and carrying out feedback of analog domain code word indication according to the channel condition of the original space channel.
In this embodiment of the present invention, the performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to a base station includes:
performing Reference Signal Received Power (RSRP) measurement on a current wave beam of an analog domain according to an analog domain code word indication signaling in the control information; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; alternatively, the first and second electrodes may be,
estimating a downlink channel based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
The base station provided by the embodiment of the invention comprises:
the first processing unit is used for sending system information and control information to the terminal according to high-level configuration; receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal;
the second processing unit is used for sending a downlink reference signal to the terminal; receiving channel information sent by a terminal;
the third processing unit is used for scheduling and pairing the terminal according to the channel information and sending data to the terminal;
and the fourth processing unit is used for determining whether to perform HARQ processing according to the acknowledgement information or the non-acknowledgement information sent by the terminal.
In this embodiment of the present invention, the first processing unit is further configured to add an analog domain codeword indication signaling to the control information according to an analog domain beam selection and feedback manner.
In this embodiment of the present invention, the first processing unit is further configured to set a new DCI format in a control channel, and add a codeword indication signaling currently used in an analog domain through the new DCI format.
In the embodiment of the present invention, the base station further includes: the fifth processing unit is used for carrying out mixed pre-coding on the analog domain and the digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode.
In this embodiment of the present invention, the second processing unit is further configured to:
and sending the downlink reference signal to an antenna array through an antenna port, and sending the downlink reference signal through the antenna array.
The terminal provided by the embodiment of the invention comprises:
the first processing unit is used for receiving system information and control information sent by a base station; transmitting digital domain beam indication feedback information and analog domain beam indication feedback information to a base station;
the second processing unit is used for receiving a downlink reference signal sent by the base station, performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to the base station;
the third processing unit is used for receiving data sent by the base station and demodulating the data according to the control information; and sending confirmation information or non-confirmation information to the base station according to the demodulation result.
In the embodiment of the present invention, the terminal further includes:
a fourth processing unit, configured to perform downlink channel estimation based on each antenna array to obtain an original spatial channel; and carrying out feedback of analog domain code word indication according to the channel condition of the original space channel.
In this embodiment of the present invention, the second processing unit is further configured to perform RSRP measurement on a current beam in an analog domain according to an analog domain codeword indication signaling in the control information; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; or, performing downlink channel estimation based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
In the technical scheme of the embodiment of the invention, a base station sends system information and control information to a terminal according to high-level configuration; receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal; sending a downlink reference signal to a terminal, and receiving channel information sent by the terminal; scheduling and pairing the terminal according to the channel information, and sending data to the terminal; and determining whether to perform HARQ processing according to the confirmation information or the non-confirmation information sent by the terminal. Therefore, the embodiment of the invention realizes the signal transmission of the multi-antenna system under the mixed architecture of the digital domain and the analog domain.
Drawings
Fig. 1 is a diagram of a conventional antenna system architecture;
fig. 2 is a schematic flowchart of a signal processing method under the digital-analog domain hybrid architecture according to a first embodiment of the present invention;
fig. 3 is a schematic flowchart of a signal processing method under the digital-analog domain hybrid architecture according to a second embodiment of the present invention;
fig. 4 is a signal processing flow chart of a digital-analog domain hybrid architecture according to a third embodiment of the present invention;
FIG. 5 is an analog-to-digital domain hybrid architecture diagram of an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
The multi-antenna technology is fully applied to the current 4G system. However, in any transmission mode, the processing of multiple antennas is currently performed in the digital domain, and as the number of antennas continuously increases, if the signal processing of multiple antennas is performed in the digital domain, it will inevitably bring about a very large cost overhead and complexity of algorithm processing. Therefore, the embodiment of the invention provides a signal processing method under a digital-analog domain hybrid architecture.
Fig. 2 is a schematic flow chart of a signal processing method under a digital-analog domain hybrid architecture according to an embodiment of the present invention, where the signal processing method under the digital-analog domain hybrid architecture in this example is applied to a base station side, and as shown in fig. 2, the signal processing method under the digital-analog domain hybrid architecture includes the following steps:
step 201: and sending system information and control information to the terminal according to the high-level configuration.
In the embodiment of the present invention, the digital-analog domain hybrid architecture is divided into a full connection structure and a partial connection structure according to different mapping (connection) modes between the TXRU and the antenna elements, as shown in fig. 5. According to the different mapping (connection) modes from antenna ports to TXRU, the mapping (connection) modes can be classified into Non-precoded RS (Non-precoded RS), beamforming RS (beamforming RS) or a hybrid mode of the two.
Based on the multi-antenna system of the digital-analog domain hybrid architecture, the base station sends system information and control information to the terminal according to high-level configuration.
Here, according to the analog domain beam selection and feedback mode, an analog domain codeword indication signaling is added to the control information.
Specifically, according to the difference between analog domain beam selection and feedback modes, compared with the existing LTE/LTE-a standard practice, an analog domain codeword indication signaling is added in the aspect of control information, so as to avoid the problem of complexity of linear array subchannel estimation every day.
In this embodiment of the present invention, the adding of the analog domain codeword indication signaling to the control information includes:
setting a new DCI format in a control channel, and adding a code word indication signaling currently used by an analog domain through the new DCI format.
As an implementation manner, in the embodiment of the present invention, the downlink channel estimation is based on each antenna element. Because the method can directly obtain the original space channel, each terminal can perform subsequent analog domain code word indication feedback according to the respective channel condition, and theoretically, an indication signaling for the current used code word condition in a control channel is not needed.
Step 202: and receiving the digital domain beam indication feedback information and the analog domain beam indication feedback information sent by the terminal.
In the existing LTE/LTE-a system, the processing related to multiple antennas is performed only in the data domain, and fixed beam pointing is adopted in the analog domain. In the embodiment of the invention, because a digital-analog domain hybrid architecture is adopted and a certain degree of flexible beam pointing processing is allowed to be carried out in an analog domain, beam pointing feedback information in the analog domain is added in addition to the feedback of the digital domain according to the difference between the analog domain beam selection and the feedback mode.
Step 203: and sending a downlink reference signal to the terminal and receiving channel information sent by the terminal.
In the embodiment of the invention, the base station sends the downlink reference signal, and then the terminal carries out channel estimation according to the downlink reference signal sent by the base station, thereby obtaining the channel information and feeding back the channel information. Here, the channel information is the following information: rank Indication (RI), Channel Quality Indication (CQI), Precoding Matrix Indication (PMI).
In the embodiment of the invention, the downlink reference signal needs to be sent to the antenna array through the antenna port, and the downlink reference signal needs to be sent through the antenna array.
Step 204: and scheduling and pairing the terminal according to the channel information, and sending data to the terminal.
Here, the base station performs terminal scheduling and pairing processing according to channel information fed back by the terminal, and then performs data transmission. The terminal side demodulates the received data according to the control information.
Step 205: and determining whether to perform HARQ processing according to the confirmation information or the non-confirmation information sent by the terminal.
In the embodiment of the invention, the terminal feeds back the confirmation information or the non-confirmation information (ACK/NACK) according to the demodulation result, and then the base station determines whether to start the HARQ process according to the ACK/NACK reported by the terminal.
Fig. 3 is a flowchart illustrating a signal processing method under the digital-analog domain hybrid architecture according to a second embodiment of the present invention, where the signal processing method under the digital-analog domain hybrid architecture in this example is applied to a terminal side, as shown in fig. 3, the signal processing method under the digital-analog domain hybrid architecture includes the following steps:
step 301: and receiving system information and control information sent by the base station.
Step 302: and transmitting the digital domain beam indication feedback information and the analog domain beam indication feedback information to the base station.
In the embodiment of the present invention, the method further includes:
estimating a downlink channel based on each antenna array to obtain an original spatial channel;
and carrying out feedback of analog domain code word indication according to the channel condition of the original space channel.
Step 303: receiving a downlink reference signal sent by a base station, performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to the base station.
In this embodiment of the present invention, the performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to a base station includes:
according to the analog domain code word indication signaling in the control information, RSRP measurement is carried out on the current wave beam of the analog domain; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; alternatively, the first and second electrodes may be,
estimating a downlink channel based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
In the embodiment of the invention, the base station sends the downlink reference signal to the antenna array through the antenna port, and sends the downlink reference signal through the antenna array.
Step 304: receiving data sent by a base station, and demodulating the data according to the control information; and sending confirmation information or non-confirmation information to the base station according to the demodulation result.
Fig. 4 is a signal processing flow chart of a digital-analog domain hybrid architecture according to a fourth embodiment of the present invention, as shown in fig. 4, the flow chart includes:
and the base station transmits system information and control information according to the high-level configuration. Here, according to the difference between analog domain beam selection and feedback mode, compared with the existing LTE/LTE-a standard practice, the digital analog domain hybrid architecture needs to add analog domain codeword indication signaling in terms of control information, so as to avoid the complexity problem of linear array subchannel estimation every day.
Reference signal transmission and channel information feedback. Specifically, the base station sends a downlink reference signal, and then the terminal performs channel estimation according to the downlink reference signal sent by the base station, so as to obtain channel information and feed back the channel information (RI/CQI/PMI). In the embodiment of the invention, the base station sends the downlink reference signal to the antenna array through the antenna port, and sends the downlink reference signal through the antenna array. Here, in the existing LTE/LTE-a system, the processing related to multiple antennas is performed only in the data domain, and the analog domain employs fixed beam pointing. In the embodiment of the invention, because a digital-analog domain hybrid architecture is adopted and a certain degree of flexible beam pointing processing is allowed to be carried out in an analog domain, feedback indication of the analog domain beam needs to be newly added in addition to the feedback of the digital domain according to the difference between the analog domain beam selection and the feedback mode.
User scheduling and data transmission and reception. Specifically, the base station performs user scheduling and pairing processing according to the channel information fed back by the terminal, and then performs data transmission. The terminal side demodulates the received data according to the control information.
A HARQ mechanism. Specifically, the terminal feeds back ACK/NACK according to the demodulation result, and then the base station determines whether to start the HARQ process according to the ACK/NACK condition reported by the terminal.
The following is described for the specific processes involved in each of the above stages:
analog domain codeword indication:
the first scheme is as follows: defining a new DCI format in the existing DCI of the LTE/LTE-A control channel, and adding a code word indication signaling currently used by an analog domain.
Scheme II: the downlink channel estimation based on each antenna array can be carried out to directly obtain the original space channel, therefore, each terminal can carry out subsequent analog domain code word indication feedback according to the respective channel condition, and the condition does not need an indication signaling for the current used code word condition in a control channel.
Channel information acquisition and feedback:
the first scheme is as follows: the terminal performs RSRP measurement on a current beam in an analog domain according to an analog domain codeword indication signaling in a control channel, and feeds back an analog domain beam according to a certain criterion (usually RSRP is maximum) according to a measurement result, where the feedback is not necessarily explicit feedback (directly feeding back an analog beam or angle information) but may also be implicit feedback (index indication information for an analog beam or angle).
Scheme II: due to the original spatial channels on each antenna element, the terminal follows certain criteria, such as: and (3) directly feeding back the index of the code word used in the analog domain according to the signal-to-noise ratio maximization principle.
Mixed pre-coding in analog domain and digital domain:
the first scheme is as follows: the analog domain precoding matrix is updated according to a fixed structure (such as DFT codebook) under a larger time granularity, and the digital domain codebook is dynamically adjusted according to the user channel change.
Scheme II: the precoding matrix during data transmission is dynamically updated by a digital domain and an analog domain in an alternative optimization mode according to the channel condition of a user.
Fig. 6 is a schematic structural diagram of a base station according to a fourth embodiment of the present invention, and as shown in fig. 6, the base station includes:
a first processing unit 61, configured to send system information and control information to a terminal according to high-level configuration; receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal;
a second processing unit 62, configured to send a downlink reference signal to a terminal; receiving channel information sent by a terminal;
a third processing unit 63, configured to perform scheduling and pairing processing on the terminal according to the channel information, and send data to the terminal;
a fourth processing unit 64, configured to determine whether to perform HARQ processing according to the acknowledgement information or non-acknowledgement information sent by the terminal.
The first processing unit 61 is further configured to add an analog domain codeword indication signaling to the control information according to an analog domain beam selection and feedback manner.
The first processing unit 61 is further configured to set a new DCI format in the control channel, and add a codeword indication signaling currently used in the analog domain through the new DCI format.
The base station further comprises: a fifth processing unit 65, configured to perform hybrid pre-coding on the analog domain and the digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode.
In this embodiment of the present invention, the second processing unit 62 is further configured to: and sending the downlink reference signal to the antenna array through the antenna port, and sending the downlink reference signal through the antenna array.
Those skilled in the art will understand that the implementation functions of each unit in the base station shown in fig. 6 can be understood by referring to the related description of the signal processing method under the aforementioned digital-analog domain hybrid architecture.
Fig. 7 is a schematic structural composition diagram of a terminal according to a fifth embodiment of the present invention, and as shown in fig. 7, the terminal includes:
a first processing unit 71, configured to receive system information and control information sent by a base station; transmitting digital domain beam indication feedback information and analog domain beam indication feedback information to a base station;
a second processing unit 72, configured to receive a downlink reference signal sent by a base station, perform channel estimation according to the downlink reference signal to obtain channel information, and send the channel information to the base station;
a third processing unit 73, configured to receive data sent by a base station, and demodulate the data according to the control information; and sending confirmation information or non-confirmation information to the base station according to the demodulation result.
The terminal further comprises:
a fourth processing unit 74, configured to perform downlink channel estimation based on each antenna element, so as to obtain an original spatial channel; and carrying out feedback of analog domain code word indication according to the channel condition of the original space channel.
The second processing unit 72 is further configured to perform RSRP measurement on a current beam in an analog domain according to an analog domain codeword indication signaling in the control information; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; or, performing downlink channel estimation based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
As an implementation manner, in the embodiment of the present invention, the downlink channel estimation is based on each antenna element. Because the method can directly obtain the original space channel, each terminal can perform subsequent analog domain code word indication feedback according to the respective channel condition, and theoretically, an indication signaling for the current used code word condition in a control channel is not needed.
Those skilled in the art will understand that the implementation functions of each unit in the terminal shown in fig. 7 can be understood by referring to the related description of the signal processing method under the aforementioned digital-analog domain hybrid architecture.
The technical schemes described in the embodiments of the present invention can be combined arbitrarily without conflict.
In the embodiments provided in the present invention, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one second processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A method for processing signals under a digital-analog domain hybrid architecture, the method comprising:
adding analog domain code word indication signaling in the control information according to the analog domain beam selection and feedback mode;
sending system information and the control information to a terminal according to high-level configuration; wherein the control information is operable to: after receiving the control information, the terminal carries out downlink channel estimation based on each antenna array to obtain an original space channel, and carries out feedback of analog domain code word indication according to the channel condition of the original space channel;
receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal;
sending a downlink reference signal to a terminal, and receiving channel information sent by the terminal;
scheduling and pairing the terminal according to the channel information, and sending data to the terminal;
performing mixed pre-coding on an analog domain and a digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode;
and determining whether to perform hybrid automatic repeat request (HARQ) processing according to the confirmation information or the non-confirmation information sent by the terminal.
2. The signal processing method under the digital-analog domain hybrid architecture of claim 1, wherein the adding of analog domain codeword indication signaling in the control information comprises:
setting a new downlink control information DCI format in a control channel, and adding a code word indication signaling currently used in an analog domain through the new DCI format.
3. The signal processing method under the digital-analog domain hybrid architecture according to claim 1, wherein the sending the downlink reference signal to the terminal includes:
and sending the downlink reference signal to an antenna array through an antenna port, and sending the downlink reference signal through the antenna array.
4. A method for processing signals under a digital-analog domain hybrid architecture, the method comprising:
receiving system information and control information sent by a base station;
estimating a downlink channel based on each antenna array to obtain an original space channel, and feeding back an analog domain code word indication according to the channel condition of the original space channel;
transmitting digital domain beam indication feedback information and analog domain beam indication feedback information to a base station;
receiving a downlink reference signal sent by a base station, performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to the base station;
receiving data sent by a base station, and demodulating the data according to the control information; sending confirmation information or non-confirmation information to the base station according to the demodulation result; the data is obtained by the base station through mixed pre-coding of an analog domain and a digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode.
5. The signal processing method according to claim 4, wherein the performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to a base station comprises:
performing Reference Signal Received Power (RSRP) measurement on a current wave beam of an analog domain according to an analog domain code word indication signaling in the control information; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; alternatively, the first and second electrodes may be,
estimating a downlink channel based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
6. A base station, characterized in that the base station comprises:
the first processing unit is used for sending system information and control information to the terminal according to high-level configuration; receiving digital domain beam indication feedback information and analog domain beam indication feedback information sent by a terminal; wherein the control information is used for: the terminal carries out downlink channel estimation based on each antenna array to obtain an original space channel, and carries out feedback of analog domain code word indication according to the channel condition of the original space channel;
the first processing unit is further configured to add an analog domain codeword indication signaling to the control information according to an analog domain beam selection and feedback manner;
the second processing unit is used for sending a downlink reference signal to the terminal; receiving channel information sent by a terminal;
the third processing unit is used for scheduling and pairing the terminal according to the channel information and sending data to the terminal;
a fourth processing unit, configured to determine whether to perform HARQ processing according to acknowledgement information or non-acknowledgement information sent by the terminal;
the fifth processing unit is used for carrying out mixed pre-coding on the analog domain and the digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode.
7. The base station of claim 6, wherein the first processing unit is further configured to set a new DCI format in a control channel, and add a codeword indication signaling currently used in an analog domain through the new DCI format.
8. The base station of claim 6, wherein the second processing unit is further configured to:
and sending the downlink reference signal to an antenna array through an antenna port, and sending the downlink reference signal through the antenna array.
9. A terminal, characterized in that the terminal comprises:
the first processing unit is used for receiving system information and control information sent by a base station; transmitting digital domain beam indication feedback information and analog domain beam indication feedback information to a base station;
the second processing unit is used for receiving a downlink reference signal sent by the base station, performing channel estimation according to the downlink reference signal to obtain channel information, and sending the channel information to the base station;
the third processing unit is used for receiving data sent by the base station and demodulating the data according to the control information; sending confirmation information or non-confirmation information to the base station according to the demodulation result; the data is obtained by the base station through mixed pre-coding of an analog domain and a digital domain; the simulation domain precoding matrix is updated under the preset time granularity according to a fixed structure; the digital domain codebook is dynamically adjusted according to the change of a terminal channel; or the precoding matrix during data transmission comprises a digital domain and an analog domain, and the precoding matrix is dynamically updated according to a terminal channel in an alternative optimization mode;
a fourth processing unit, configured to perform downlink channel estimation based on each antenna array to obtain an original spatial channel; and carrying out feedback of analog domain code word indication according to the channel condition of the original space channel.
10. The terminal of claim 9, wherein the second processing unit is further configured to perform RSRP measurement on a current analog-domain beam according to analog-domain codeword indication signaling in the control information; according to the measurement result, the analog domain wave beam is fed back according to a specified criterion; wherein the feedback is explicit feedback or implicit feedback; or, performing downlink channel estimation based on each antenna array to obtain an original spatial channel; and feeding back the code word index used by the analog domain according to a specified criterion.
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