CN110890950A - Signal processing method, access network equipment and terminal equipment - Google Patents
Signal processing method, access network equipment and terminal equipment Download PDFInfo
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- CN110890950A CN110890950A CN201811050791.3A CN201811050791A CN110890950A CN 110890950 A CN110890950 A CN 110890950A CN 201811050791 A CN201811050791 A CN 201811050791A CN 110890950 A CN110890950 A CN 110890950A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The embodiment of the application discloses a signal processing method. The method in the embodiment of the application comprises the following steps: the access network equipment sends indication information to the terminal equipment; when the indication information indicates that the terminal equipment sends the demodulation reference signal which is not subjected to precoding processing and the uplink data which is subjected to precoding processing and corresponds to each sub-band to the access network equipment, the access network equipment receives the demodulation reference signal which is not subjected to precoding processing and the uplink data which is subjected to precoding processing and is sent by the terminal equipment; the access network equipment determines a channel response coefficient matrix of each sub-band according to the demodulation reference signal of each sub-band which is not subjected to precoding processing; the access network equipment calculates an uplink equivalent channel matrix according to the channel response coefficient matrix of each sub-band and the pre-coding matrix of each sub-band; and the access network equipment acquires original uplink data in the full bandwidth according to the uplink equivalent channel matrix of each sub-band and the uplink data of each sub-band after precoding processing.
Description
Technical Field
The present application relates to communications technologies, and in particular, to a signal processing method, an access network device, and a terminal device.
Background
With the development of communication technology, users have higher and higher requirements for transmission quality of data transmission.
At present, in order to improve the transmission performance of a communication system in a fading channel, a terminal device performs precoding processing on a demodulation reference signal and uplink data of a corresponding port through the same precoding matrix and then transmits the precoding processed uplink data to a base station side, and the base station side performs channel estimation through the precoding processed demodulation reference signal to determine an uplink equivalent channel and then performs channel equalization, thereby improving the quality of data transmission.
However, when the terminal device processes the uplink data by using a sub-band precoding method and sends the uplink data and the precoded demodulation reference signal to the access network device, the base station receives the precoded uplink data corresponding to each sub-band, and performs the process of equivalent channel estimation in different sub-bands, which results in the performance of the base station for performing transform domain channel estimation being damaged and affects the demodulation performance of the uplink data.
Disclosure of Invention
The embodiment of the application provides a signal processing method, access network equipment and terminal equipment, which are used for improving the precision of channel estimation and the performance of channel equalization.
A first aspect of an embodiment of the present application provides a signal processing method, including:
in a communication system, in order to improve the spectrum utilization rate, an access network device may send, to a terminal device, indication information after determining a channel state, where the indication information is used to indicate a sending method in which the terminal device sends a demodulation reference signal and a processing method in which the terminal device performs precoding processing on uplink data to be sent; when the indication information indicates that the terminal device sends a demodulation reference signal which is not precoded and corresponds to each sub-band in the full bandwidth and precoded uplink data which corresponds to each sub-band to the access network device, the access network device receives a precoding matrix which corresponds to each sub-band and precoded uplink data which corresponds to each sub-band which are sent by the terminal device; then the access network equipment determines a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal which is not subjected to precoding and corresponds to each sub-band; the access network equipment calculates an uplink equivalent channel matrix according to the channel response coefficient matrix corresponding to each sub-band and a pre-coding matrix corresponding to each sub-band, wherein the pre-coding matrix is a matrix adopted when pre-coding uplink data which is subjected to pre-coding processing and corresponds to each sub-band; and then, the access network equipment acquires original uplink data in the full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the uplink data which is subjected to precoding processing and corresponds to each sub-band.
In this embodiment, when the access network device instructs the terminal device to send a demodulation reference signal without precoding and process uplink data in a subband precoding processing manner, the access network device may perform joint channel estimation according to the demodulation reference signal in a bandwidth, then determine an uplink channel equivalent matrix corresponding to each subband according to a precoding matrix corresponding to each subband and a channel response coefficient, and then perform channel equalization. Therefore, the access network equipment determines the channel state of each sub-band in the full bandwidth, and can perform channel estimation according to the channel state of each sub-band in the full bandwidth in the channel estimation process, so that the accuracy of channel estimation and the performance of channel equalization are improved.
In a possible implementation manner, before the access network device sends the indication information to the terminal device, the method may further include: firstly, an access network device receives a sounding reference signal sent by a terminal device; then the access network equipment judges whether the power difference value of adjacent sub-bands on an uplink channel is larger than a preset threshold value or not according to the detection reference signal, if so, the access network equipment generates indication information, and the indication information is used for indicating the terminal equipment to send a demodulation reference signal which is not subjected to precoding processing to the access network equipment and processing the uplink data to be sent in a sub-band precoding processing mode; and if the uplink data is not larger than the preset threshold value, the access network equipment generates indication information, and the indication information is used for indicating the terminal equipment to send the precoded demodulation reference signal to the access network equipment and process the uplink data to be sent in a full-band precoding mode. In the possible implementation manner, a specific indication information generation manner is provided, and in practical application, the realizability and integrity of the scheme are improved.
In another possible implementation manner, the indication information may be Downlink Control Information (DCI) or Radio Resource Control (RRC) signaling. In this possible implementation manner, two specific line types of indication information are provided, and in practical application, the realizability and diversity of the scheme are improved.
A second aspect of the embodiments of the present application provides a signal processing method, including:
in a communication system, a base station can send indication information to a terminal device according to the state of a current uplink channel, and then the terminal device can receive the indication information, wherein the indication information is used for indicating a sending mode of sending a demodulation reference signal by the terminal device and a processing mode adopted by the terminal device for carrying out precoding processing on uplink data to be sent; then the terminal equipment determines to send a demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band to the access network equipment according to the indication information and processes uplink data to be sent by adopting a sub-band precoding processing mode; and then the terminal equipment sends the demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band and the uplink data which is subjected to precoding processing and corresponds to each sub-band to the access network equipment. In this possible implementation manner, the terminal device may determine a sending manner for sending the demodulation reference signal according to the indication information, and when it is determined to send the demodulation reference signal without precoding processing to the access network device and process the uplink data to be sent by using the subband precoding processing manner, the terminal device may send the demodulation reference signal without precoding processing corresponding to each subband and the uplink data to be sent by using the subband precoding processing manner to the access network device, so that the access network device may perform channel estimation in conjunction with the demodulation reference signal and determine the uplink equivalent channel matrix of each subband according to the channel state in each subband, and then perform channel equalization, thereby improving the accuracy of channel estimation and the performance of channel equalization.
In a possible implementation manner, before the terminal device receives the indication information sent by the access network device, the method may further include: the terminal device may send a sounding reference signal to the access network device.
In another possible implementation manner, the indication information may be DCI or RRC signaling.
A third aspect of the embodiments of the present application provides an access network device, where the access network device has a function of implementing a behavior of the access network device in the first aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.
A fourth aspect of the embodiments of the present application provides a terminal device, where the terminal device has a function of implementing a behavior of the terminal device in the second aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.
A fifth aspect of the embodiments of the present application provides an access network device, where the access network device includes: a processor, a memory, an input-output device, and a bus; the processor, the memory and the input and output equipment are respectively connected with the bus, and computer instructions are stored in the memory; when the processor executes the computer instructions in the memory, the memory stores the computer instructions; the processor, when executing the computer instructions in the memory, is adapted to implement any of the implementations of the first aspect.
A sixth aspect in an embodiment of the present application provides a terminal device, including: a processor, a memory, an input-output device, and a bus; the processor, the memory and the input and output equipment are respectively connected with the bus, and computer instructions are stored in the memory; when the processor executes the computer instructions in the memory, the memory stores the computer instructions; the processor, when executing the computer instructions in the memory, is adapted to implement an implementation as in any of the second aspects.
A seventh aspect of embodiments of the present application provides a chip system, where the chip system includes a processor, configured to support a network device to implement the functions referred to in the first aspect, for example, to transmit or process data and/or information referred to in the method. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.
An eighth aspect of the present embodiment provides a chip system, which includes a processor, and is configured to enable a network device to implement the functions referred to in the second aspect, for example, to transmit or process data and/or information referred to in the method. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.
A ninth aspect of embodiments of the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform an implementation as in any one of the first or second aspects.
A tenth aspect of embodiments of the present application provides a computer-readable storage medium, which is characterized by comprising instructions that, when executed on a computer, cause the computer to perform any one of the implementations of the first aspect or the second aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
according to the technical scheme, when the access network equipment instructs the terminal equipment to send the demodulation reference signal without precoding and processes the uplink data by adopting a subband precoding processing mode, the access network equipment can perform joint channel estimation according to the demodulation reference signal in the bandwidth, then determines the uplink channel equivalent matrix corresponding to each subband according to the precoding matrix corresponding to each subband and the channel response coefficient, and then performs channel equalization. Therefore, the access network device determines the channel state of each sub-band in the full bandwidth, and in the channel estimation process, the channel estimation can be performed according to the channel response coefficient matrix of each sub-band and the channel state of each sub-band in the full bandwidth, so that the accuracy of the channel estimation and the performance of the channel equalization are improved.
Drawings
FIG. 1 is a system scenario framework diagram according to an embodiment of the present application;
fig. 2 is a schematic diagram of an embodiment of a signal processing method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an access network device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 5 is another schematic structural diagram of an access network device according to an embodiment of the present application;
fig. 6 is another schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a signal processing method, access network equipment and terminal equipment, which are used for improving the precision of channel estimation and the performance of channel equalization.
Referring to fig. 1, fig. 1 is a schematic diagram of an application scenario system framework according to an embodiment of the present disclosure. In order to perform channel estimation and channel equalization, currently, a terminal device sends a demodulation reference signal in a bandwidth scheduled by an access network device to the access network device in a transparent manner, and the specific process is as follows: the terminal equipment inserts the demodulation reference signal into the uplink data to be sent, then pre-codes the uplink data through a pre-coding matrix, then the terminal equipment maps the pre-coded uplink data to a corresponding sending port, sends the uplink data to the access network equipment, then the access network equipment carries out channel estimation according to the pre-coded demodulation reference signal to obtain a channel response coefficient matrix, and carries out channel equalization according to the channel response coefficient matrix. However, when the terminal device processes the uplink data by using a subband precoding method and sends the uplink data and the precoded demodulation reference signal to the access network device, the access network device receives the precoded uplink data corresponding to each subband and performs the equivalent channel estimation process in different subbands, which results in the performance of the access network device for performing transform domain channel estimation being damaged and the performance of demodulating the uplink data being poor.
It should be noted that fig. 1 is a schematic diagram of a system scenario in a communication system, and an access network device according to the embodiment of the present application may be a base station, an access point, or a device in an access network that communicates with a wireless terminal over an air interface through one or more sectors. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the base station may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) or Code Division Multiple Access (CDMA), may be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA), and may be an evolved Node B (eNB or e-NodeB) in LTE, which is not limited in the present application.
In addition, a terminal device may be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), an intelligent terminal, and the like, and the terminal device may communicate with one or more core networks through a Radio Access Network (RAN). For example, the terminal equipment may be a mobile phone (or so-called "cellular" phone), a computer with a mobile terminal, etc., and the terminal equipment may also be a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device and terminal equipment in future NR networks, which exchange voice or data with a radio access network. Description of terminal device: in this application, the terminal device may further include a Relay, and both the terminal device and the base station that can perform data communication may be regarded as the terminal device.
The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
In view of this, embodiments of the present application provide a signal processing method for improving the accuracy of channel estimation and the channel equalization performance. The access network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating a sending mode of sending a demodulation reference signal by the terminal equipment and a processing mode adopted by the terminal equipment for carrying out precoding processing on uplink data to be sent; when the indication information indicates that the terminal device sends a demodulation reference signal which is not precoded and corresponds to each sub-band in the full bandwidth and precoded uplink data which corresponds to each sub-band to the access network device, the access network device receives a precoding matrix which corresponds to each sub-band and precoded uplink data which corresponds to each sub-band which are sent by the terminal device; then the access network equipment determines a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal which is not subjected to precoding and corresponds to each sub-band; the access network equipment calculates an uplink equivalent channel matrix according to the channel response coefficient matrix corresponding to each sub-band and a pre-coding matrix corresponding to each sub-band, wherein the pre-coding matrix is a matrix adopted when pre-coding uplink data which is subjected to pre-coding processing and corresponds to each sub-band; and then, the access network equipment acquires original uplink data in the full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the uplink data which is subjected to precoding processing and corresponds to each sub-band. Therefore, when the indication information indicates that the terminal device sends the demodulation reference signal without precoding processing and the uplink data with precoding processing corresponding to each sub-band in the full bandwidth to the access network device, the access network device receives the precoding matrix corresponding to each sub-band and the uplink data with precoding processing corresponding to each sub-band sent by the terminal device, performs channel estimation according to the demodulation reference signal without precoding processing corresponding to each sub-band to obtain a channel coefficient matrix, then obtains the uplink equivalent channel matrix corresponding to each sub-band with the precoding matrix corresponding to each sub-band, and performs channel equalization according to the uplink equivalent matrix.
Therefore, when the access network device instructs the terminal device to send a demodulation reference signal without precoding and to process uplink data in a subband precoding manner, the access network device may perform joint channel estimation according to the demodulation reference signal within the bandwidth, then determine an uplink channel equivalent matrix corresponding to each subband according to a precoding matrix corresponding to each subband and a channel response coefficient, and then perform channel equalization, that is, the access network device may perform channel estimation by combining the demodulation reference signal within the bandwidth and a channel state of each subband within the full bandwidth, and then perform channel equalization, thereby improving the accuracy of channel estimation and the performance of channel equalization.
In this embodiment, the access network device may notify the terminal device of a sending method for sending a demodulation reference signal and a processing method for precoding uplink data to be sent by the terminal device through Downlink Control Information (DCI) or Radio Resource Control (RRC) signaling; in the following embodiments, only the access network device informs, through DCI, the terminal device of the transmission method for transmitting the demodulation reference signal and the processing method adopted by the terminal device to perform precoding processing on the uplink data to be transmitted are taken as an example for description. In the following embodiments, only the access network device will be described with reference to the base station and the terminal device will be described with reference to the UE as an example.
The following describes a signal processing method in the embodiment of the present application from the perspective of a base station. Referring to fig. 2, when the base station determines that the power difference between adjacent sub-bands on the uplink channel is greater than the preset threshold, the base station may send DCI to the UE, where the DCI is used to instruct the UE to send, to the base station, a demodulation reference signal that is not precoded and corresponds to each sub-band within the full bandwidth, and instruct the UE to process uplink data in a sub-band precoding manner and then send the processed uplink data to the base station. An embodiment of a signal processing method according to an embodiment of the present application includes:
201. the UE transmits a sounding reference signal to the base station.
In a communication system, in order to improve spectrum utilization, a base station side needs to determine a channel state of an uplink channel. Specifically, the base station may determine the channel status of the uplink channel through a sounding reference signal sent by the UE, and the UE may send the sounding reference signal to the base station periodically or send the sounding reference signal according to an instruction of the base station, which is not limited herein. And, the sounding reference signal sent by the UE to the base station does not undergo precoding operation. In addition, the sounding reference signal transmitted by the UE at each transmit antenna port may occupy different time domain, frequency domain, or code domain resources. For example, the UE is configured with two transmit antennas, the sounding reference signal transmitted by the first transmit antenna may occupy even subcarriers in the transmit frequency band in the frequency domain, and the sounding reference signal transmitted by the second transmit antenna occupies odd subcarriers in the transmit frequency band in the frequency domain.
202. And the base station determines that the power difference value of adjacent sub-bands on the uplink channel is greater than a preset threshold value according to the sounding reference signal.
The base station may obtain a relevant parameter of the uplink channel according to the sounding reference signal, then the base station may determine a power difference value of adjacent sub-bands on the uplink channel according to the relevant parameter, then the base station may determine whether the power difference value between the adjacent sub-bands is greater than a preset threshold value, if so, the base station may determine that the uplink channel is a frequency selective channel, and if not, the base station may determine that the uplink channel is a flat channel. When the base station determines that the uplink channel is a frequency selective channel, the base station may generate DCI, where the DCI instructs the terminal device to transmit to the base station a non-precoded demodulation reference signal corresponding to each subband in the scheduling bandwidth, and transmit uplink data after processing the uplink data in a subband precoding manner. For example, if the base station determines that the power difference between two carriers separated by 24 subcarriers on the uplink channel is greater than a preset threshold, the base station may determine that the uplink channel is a frequency selective channel, otherwise, the base station determines that the uplink channel is a flat channel.
It should be noted that, when the base station determines that the uplink channel is a flat channel, the base station generates DCI at this time, and the DCI instructs the terminal device to transmit the precoded demodulation reference signal corresponding to each subband in the scheduling bandwidth to the base station, and process the uplink data in a full-band precoding manner and then transmit the processed uplink data.
203. The base station transmits the DCI to the UE.
After the base station determines that the uplink channel is the frequency selective channel, the base station generates corresponding DCI, and then the base station may send the DCI to the UE.
204. And the UE carries out precoding processing on the uplink data transmitted through each sub-band through the corresponding precoding matrix according to the DCI, and then inserts the demodulation reference signal corresponding to each sub-band into the data after precoding processing.
And after receiving the DCI, the UE determines to send a demodulation reference signal which is not subjected to precoding processing to the access network equipment according to the DCI, and processes the uplink data to be sent by adopting a sub-band precoding mode. Then, the UE may perform precoding processing on the uplink data transmitted through each sub-band through a precoding matrix corresponding to each sub-band, then map the uplink data after precoding processing to an antenna port, and insert a demodulation reference signal corresponding to each sub-band into the data after precoding processing in each antenna port.
205. And the UE sends the demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band and the uplink data which is subjected to precoding processing and corresponds to each sub-band to the base station.
The UE may send, to the base station through the corresponding antenna port, the demodulation reference signal that is not precoded and corresponds to each subband, and the precoded uplink data that corresponds to each subband. Specifically, the UE may send the demodulation reference signal without precoding processing corresponding to each sub-band to the base station through different time-frequency resources, for example, the UE is configured with two sending antennas, where the demodulation reference signal sent on the sending antenna 1 occupies odd subcarriers in a bandwidth, and the demodulation reference signal sent on the sending antenna 2 occupies even subcarriers in the bandwidth.
206. And the base station determines a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal which is not subjected to precoding and corresponds to each sub-band.
After the base station receives the demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band and sent by the UE, the base station may determine a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal corresponding to each sub-band, that is, the base station performs a channel estimation process on an uplink channel.
207. And the base station determines a precoding matrix adopted by the uplink data transmitted through each sub-band according to the uplink data which is subjected to precoding processing and corresponds to each sub-band.
After receiving the uplink data subjected to precoding processing corresponding to each sub-band, the base station may determine a precoding matrix adopted by the uplink data transmitted by each sub-band.
208. And the base station determines an uplink equivalent channel matrix corresponding to each sub-band according to the channel response coefficient matrix corresponding to each sub-band and the pre-coding matrix corresponding to each sub-band.
The base station may multiply the channel response coefficient matrix corresponding to each sub-band by the precoding matrix corresponding to each sub-band to obtain the uplink equivalent channel matrix corresponding to each sub-band. In this embodiment, when the base station determines that the power difference between adjacent subbands of the current uplink channel is greater than a preset threshold, the base station may instruct, through DCI, the UE to process the uplink data in a subband precoding manner, where the subband precoding manner may enable the UE to perform precoding processing on the uplink data transmitted in each subband through a precoding matrix corresponding to each subband, that is, the UE may perform different precoding processing on the uplink data in different subbands according to fading characteristics of the channel, so as to improve uplink received signal quality and improve uplink transmission rate. In this embodiment, therefore, the estimation of the channel by the base station may combine the demodulation reference signal of each sub-band and the precoding matrix of each sub-band, which may improve the performance of channel estimation of the base station, improve the accuracy of channel estimation, and improve the performance of channel equalization in the subsequent process.
209. And the base station acquires the original uplink data transmitted through each sub-band according to the uplink equivalent channel matrix corresponding to each sub-band and the uplink data which is subjected to precoding processing and corresponds to each sub-band.
After determining the uplink equivalent channel matrix corresponding to each sub-band, the base station acquires the original uplink data transmitted through each sub-band according to the uplink equivalent channel matrix corresponding to each sub-band and the uplink data subjected to precoding processing corresponding to each sub-band.
210. And the base station acquires the original uplink data in the full bandwidth according to the original uplink data transmitted by each sub-band.
After the base station acquires the original uplink data transmitted by each sub-band, the original uplink data transmitted by each sub-band can be integrated to obtain the original uplink data in the full bandwidth. In addition, in the scheme of the application, the base station determines that the uplink channel is a frequency selective channel, and may adopt a discontinuous scheduling mode, that is, a transmitted signal is scheduled in a plurality of discontinuous sub-bands with small fading, so that the decrease of the transmission rate caused by channel frequency selection may be resisted.
In the embodiment of the application, when the access network device instructs the terminal device to send a demodulation reference signal without precoding and to process uplink data in a subband precoding processing manner, the access network device may perform joint channel estimation according to the demodulation reference signal in a bandwidth, then determine an uplink channel equivalent matrix corresponding to each subband according to a precoding matrix corresponding to each subband and a channel response coefficient, and then perform channel equalization. That is, the access network device may perform channel estimation by combining the demodulation reference signal in the bandwidth and the channel state of each sub-band in the full bandwidth, and then perform channel equalization, thereby improving the accuracy of channel estimation and the performance of channel equalization.
The foregoing describes the signal processing method in the embodiment of the present application, and the following describes the access network device in the embodiment of the present application, please refer to fig. 3, where the determining unit 305 and the generating unit 306 are optional units, and an embodiment of the access network device in the embodiment of the present application includes:
a sending unit 301, configured to send instruction information to a terminal device, where the instruction information is used to instruct the terminal device to send a sending method of a demodulation reference signal and a processing method used by the terminal device to perform precoding processing on uplink data to be sent;
a receiving unit 302, configured to receive, when the indication information indicates that the terminal device sends, to the access network device, a demodulation reference signal that is not precoded and corresponds to each sub-band in a full bandwidth and uplink data that is precoded and corresponds to each sub-band, the demodulation reference signal that is not precoded and corresponds to each sub-band and the uplink data that is precoded and corresponds to each sub-band and is sent by the terminal device;
a calculating unit 303, configured to calculate a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal corresponding to each sub-band and without precoding processing; calculating an uplink equivalent channel matrix of each sub-band according to the channel response coefficient matrix corresponding to each sub-band and the pre-coding matrix corresponding to each sub-band, wherein the pre-coding matrix is a matrix adopted when pre-coding is carried out on the pre-coded uplink data corresponding to each sub-band;
an obtaining unit 304, configured to obtain original uplink data in a full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the precoded uplink data corresponding to each sub-band.
In this embodiment, the receiving unit 303 is further configured to:
receiving a sounding reference signal sent by the terminal equipment;
the access network device further includes:
a determining unit 305, configured to determine, according to the sounding reference signal, that a power difference value of an adjacent sub-band on an uplink channel is greater than a preset threshold;
a generating unit 306, configured to generate, when the power difference is greater than a preset threshold, indication information, where the indication information is used to indicate that the terminal device sends, to the access network device, a demodulation reference signal that is not subjected to precoding processing and that uplink data to be sent is processed in a sub-band precoding processing manner;
the generating unit 306 is further configured to generate the indication information when the power difference is smaller than a preset threshold, where the indication information is used to indicate that the terminal device sends the precoded demodulation reference signal to the access network device and uplink data to be sent are processed in a full-band precoding manner.
In this embodiment, the indication information may be DCI or RRC signaling.
In this embodiment of the present application, the sending unit 301 sends instruction information to the terminal device, where the instruction information is used to instruct the terminal device to send a sending method of a demodulation reference signal and a processing method adopted by the terminal device to perform precoding processing on uplink data to be sent; when the indication information indicates that the terminal device sends, to the access network device, a demodulation reference signal that is not precoded and corresponds to each sub-band in the full bandwidth and precoded uplink data that corresponds to each sub-band, the receiving unit 302 receives a precoding matrix that corresponds to each sub-band and precoded uplink data that corresponds to each sub-band, which are sent by the terminal device; then, the calculating unit 303 calculates a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal corresponding to each sub-band and not subjected to precoding processing; the calculating unit 303 calculates an uplink equivalent channel matrix according to the channel response coefficient matrix corresponding to each sub-band and a precoding matrix corresponding to each sub-band, where the precoding matrix is a matrix adopted when precoding-processed uplink data corresponding to each sub-band is subjected to precoding processing; then, the obtaining unit 304 obtains the original uplink data in the full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the pre-coded uplink data corresponding to each sub-band. Therefore, the base station determines the channel state of each sub-band in the full bandwidth, and can perform channel estimation according to the channel state of each sub-band in the full bandwidth in the channel estimation process, so that the accuracy of channel estimation and the performance of channel equalization are improved.
With reference to fig. 4, a description is given above of a signal processing method in an embodiment of the present application, where a terminal device provided in the embodiment of the present application is described below, and an embodiment of the terminal device in the embodiment of the present application includes:
a receiving unit 401, configured to receive indication information sent by an access network device, where the indication information is used to indicate a sending method for the terminal device to send a demodulation reference signal and a processing method for the terminal device to perform precoding processing on uplink data to be sent;
a determining unit 402, configured to determine, according to the indication information, to send to the access network device a demodulation reference signal that is not precoded and corresponds to each subband, and process uplink data to be sent in a subband precoding manner;
a sending unit 403, configured to send, to the access network device, the demodulation reference signal that is not precoded and corresponds to each subband and the precoded uplink data that corresponds to each subband.
In this embodiment, the sending unit 403 is further configured to:
and sending the sounding reference signal to the access network equipment.
In this embodiment, the indication information may be DCI or RRC signaling.
In this embodiment of the present application, a receiving unit 401 receives indication information sent by an access network device, where the indication information is used to indicate a sending method in which the terminal device sends a demodulation reference signal and a processing method in which the terminal device performs precoding processing on uplink data to be sent; determining unit 402 determines to send a demodulation reference signal without precoding corresponding to each sub-band to the access network device and process uplink data to be sent by adopting a sub-band precoding processing mode according to the indication information; then, the sending unit 403 sends, to the access network device, the demodulation reference signal that is not precoded and corresponds to each subband and the precoded uplink data that corresponds to each subband. Therefore, in the scheme of the application, the terminal device may determine, according to the indication information, a transmission mode for transmitting the demodulation reference signal and process uplink data to be transmitted by using a corresponding precoding processing mode, and when it is determined to transmit the demodulation reference signal without precoding processing to the access network device and perform precoding processing on the uplink data to be transmitted by using a subband precoding processing mode, the terminal device may transmit the demodulation reference signal without precoding processing and the uplink data corresponding to each subband to the access network device, so that the access network device may perform channel estimation in conjunction with the demodulation reference signal, determine an uplink equivalent channel matrix of each subband according to a channel state in each subband, and perform channel equalization, thereby improving the accuracy of channel estimation and the performance of channel equalization.
Referring to fig. 5, an access network device 500 is further provided in the present application, where an embodiment of the access network device in the present application includes:
a processor 501, a memory 502, an input-output device 503, and a bus 504;
the processor 501, the memory 502 and the input/output device 503 are respectively connected to the bus 504, and the memory stores computer instructions;
the input/output device 503 is configured to send instruction information to the terminal device, where the instruction information is used to instruct the terminal device to send a sending method of a demodulation reference signal and a processing method used by the terminal device to perform precoding processing on uplink data to be sent; when the indication information indicates that the terminal device sends a demodulation reference signal which is not precoded and corresponds to each sub-band in the full bandwidth and uplink data which is precoded and corresponds to each sub-band to the access network device, receiving the demodulation reference signal which is not precoded and corresponds to each sub-band and the uplink data which is precoded and corresponds to each sub-band and is sent by the terminal device;
a processor 501, configured to calculate a channel response coefficient matrix corresponding to each subband according to the demodulation reference signal corresponding to each subband and without precoding; calculating an uplink equivalent channel matrix of each sub-band according to the channel response coefficient matrix corresponding to each sub-band and the pre-coding matrix corresponding to each sub-band, wherein the pre-coding matrix is a matrix adopted when pre-coding is carried out on the pre-coded uplink data corresponding to each sub-band;
and the input and output device 503 is configured to obtain original uplink data within a full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the uplink data subjected to precoding processing corresponding to each sub-band.
In one possible implementation, the input/output device 503 is further configured to:
receiving a sounding reference signal sent by the terminal equipment;
the processor 501 is further configured to:
judging that the power difference value of adjacent sub-bands on an uplink channel is greater than a preset threshold according to the sounding reference signal;
when the power difference is greater than a preset threshold value, generating the indication information, where the indication information is used to indicate that the terminal device sends a demodulation reference signal that is not precoded to the access network device and that uplink data to be sent is processed in a sub-band precoding manner;
and when the power difference is smaller than a preset threshold value, generating the indication information, wherein the indication information is used for indicating the terminal equipment to send the pre-coded demodulation reference signal and the uplink data to be sent to the access network equipment to be processed by adopting a full-band pre-coding processing mode.
In another possible implementation manner, the indication information may be DCI or RRC signaling.
As shown in fig. 6, for convenience of description, only the portions related to the embodiments of the present application are shown, and details of the specific technology are not disclosed, please refer to the method portion of the embodiments of the present application. The terminal device may be any terminal device including a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), a vehicle-mounted computer, and the like, taking the terminal device as the mobile phone as an example:
fig. 6 is a block diagram illustrating a partial structure of a mobile phone related to a terminal device provided in an embodiment of the present application. Referring to fig. 6, the handset includes: radio Frequency (RF) circuitry 1110, memory 1120, input unit 1130, display unit 1140, sensors 1150, audio circuitry 1160, wireless fidelity (WiFi) module 1170, processor 1180, and power supply 1190. Those skilled in the art will appreciate that the handset configuration shown in fig. 6 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
The following describes each component of the mobile phone in detail with reference to fig. 6:
The memory 1120 may be used to store software programs and modules, and the processor 1180 may execute various functional applications and data processing of the mobile phone by operating the software programs and modules stored in the memory 1120. The memory 1120 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 1120 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The input unit 1130 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, the input unit 1130 may include a touch panel 1131 and other input devices 1132. Touch panel 1131, also referred to as a touch screen, can collect touch operations of a user on or near the touch panel 1131 (for example, operations of the user on or near touch panel 1131 by using any suitable object or accessory such as a finger or a stylus pen), and drive corresponding connection devices according to a preset program. Alternatively, the touch panel 1131 may include two parts, namely, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 1180, and can receive and execute commands sent by the processor 1180. In addition, the touch panel 1131 can be implemented by using various types, such as resistive, capacitive, infrared, and surface acoustic wave. The input unit 1130 may include other input devices 1132 in addition to the touch panel 1131. In particular, other input devices 1132 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.
The display unit 1140 may be used to display information input by the user or information provided to the user and various menus of the cellular phone. The Display unit 1140 may include a Display panel 1141, and optionally, the Display panel 1141 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch panel 1131 can cover the display panel 1141, and when the touch panel 1131 detects a touch operation on or near the touch panel, the touch panel is transmitted to the processor 1180 to determine the type of the touch event, and then the processor 1180 provides a corresponding visual output on the display panel 1141 according to the type of the touch event. Although in fig. 6, the touch panel 1131 and the display panel 1141 are two independent components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 1131 and the display panel 1141 may be integrated to implement the input and output functions of the mobile phone.
The handset may also include at least one sensor 1150, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 1141 according to the brightness of ambient light, and the proximity sensor may turn off the display panel 1141 and/or the backlight when the mobile phone moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.
WiFi belongs to short-distance wireless transmission technology, and the cell phone can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 1170, and provides wireless broadband internet access for the user. Although fig. 6 shows the WiFi module 1170, it is understood that it does not belong to the essential constitution of the handset, and can be omitted entirely as needed within the scope not changing the essence of the invention.
The processor 1180 is a control center of the mobile phone, and is connected to various parts of the whole mobile phone through various interfaces and lines, and executes various functions of the mobile phone and processes data by operating or executing software programs and/or modules stored in the memory 1120 and calling data stored in the memory 1120, thereby performing overall monitoring of the mobile phone. Optionally, processor 1180 may include one or more processing units; preferably, the processor 1180 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated within processor 1180.
The phone also includes a power supply 1190 (e.g., a battery) for powering the various components, and preferably, the power supply may be logically connected to the processor 1180 via a power management system, so that the power management system may manage charging, discharging, and power consumption management functions.
Although not shown, the mobile phone may further include a camera, a bluetooth module, etc., which are not described herein.
In this embodiment, the processor 1180 included in the terminal device further has the following functions:
receiving indication information sent by access network equipment, wherein the indication information is used for indicating a sending mode of sending a demodulation reference signal by the terminal equipment and a processing mode adopted by the terminal equipment for carrying out precoding processing on uplink data to be sent; determining to send a demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band to access network equipment according to the indication information and processing uplink data to be sent by adopting a sub-band precoding processing mode; and sending the demodulation reference signal which is not subjected to precoding and corresponds to each sub-band and the uplink data which is subjected to precoding and corresponds to each sub-band to the access network equipment.
In one possible implementation, the processor 1180 is further configured to:
and sending the sounding reference signal to the access network equipment.
In another possible implementation, the indication information may include DCI or RRC signaling.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In another possible design, when the access network device or the terminal device is a chip in a terminal, the chip includes: a processing unit, which may be for example a processor, and a communication unit, which may be for example an input/output interface, a pin or a circuit, etc. The processing unit can execute the computer execution instructions stored in the storage unit to make the chip in the terminal execute the signal processing method of any one of the first aspect or the second aspect. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the terminal, such as a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a Random Access Memory (RAM), and the like.
The processor mentioned in any of the above may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the signal processing method according to the first aspect or the second aspect.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
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, 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, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (12)
1. A method of signal processing, the method comprising:
the access network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating a sending mode of sending a demodulation reference signal by the terminal equipment and a processing mode adopted by the terminal equipment for carrying out precoding processing on uplink data to be sent;
when the indication information indicates that the terminal device sends a demodulation reference signal which is not precoded and corresponds to each sub-band in the full bandwidth and precoded uplink data which corresponds to each sub-band to the access network device, the access network device receives the demodulation reference signal which is not precoded and corresponds to each sub-band and precoded uplink data which corresponds to each sub-band and is sent by the terminal device;
the access network equipment calculates a channel response coefficient matrix corresponding to each sub-band according to the demodulation reference signal corresponding to each sub-band and not subjected to precoding processing;
the access network equipment calculates an uplink equivalent channel matrix according to the channel response coefficient matrix corresponding to each sub-band and a pre-coding matrix corresponding to each sub-band, wherein the pre-coding matrix is a matrix adopted when pre-coding is carried out on the pre-coded uplink data corresponding to each sub-band;
and the access network equipment acquires original uplink data in a full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the pre-coded uplink data corresponding to each sub-band.
2. The method of claim 1, wherein before the access network device sends the indication information to the terminal device, the method further comprises:
the access network equipment receives a sounding reference signal sent by the terminal equipment;
the access network equipment judges whether the power difference value of adjacent sub-bands on an uplink channel is larger than a preset threshold value or not according to the detection reference signal;
if so, the access network equipment generates the indication information, wherein the indication information is used for indicating the terminal equipment to send a demodulation reference signal which is not subjected to precoding processing to the access network equipment and processing the uplink data to be sent in a sub-band precoding processing mode;
if not, the access network equipment generates the indication information, and the indication information is used for indicating the terminal equipment to send the precoded demodulation reference signal to the access network equipment and processing the uplink data to be sent in a full-band precoding mode.
3. The method according to claim 1 or 2, wherein the indication information comprises downlink control information, DCI, or radio resource control, RRC, signaling.
4. A method of signal processing, the method comprising:
the method comprises the steps that terminal equipment receives indication information sent by access network equipment, wherein the indication information is used for indicating a sending mode of sending a demodulation reference signal by the terminal equipment and a processing mode adopted by the terminal equipment for carrying out precoding processing on uplink data to be sent;
the terminal equipment determines to send a demodulation reference signal which is not subjected to precoding processing and corresponds to each sub-band to the access network equipment according to the indication information and processes uplink data to be sent by adopting a sub-band precoding processing mode;
and the terminal equipment sends the demodulation reference signal which is not subjected to precoding and corresponds to each sub-band and the uplink data which is subjected to precoding and corresponds to each sub-band to the access network equipment.
5. The method of claim 4, wherein before the terminal device receives the indication information sent by the access network device, the method further comprises:
and the terminal equipment sends a sounding reference signal to the access network equipment.
6. The method according to claim 4 or 5, wherein the indication information comprises downlink control information, DCI, or radio resource control, RRC, signaling.
7. An access network device, characterized in that the access network device comprises:
a sending unit, configured to send indication information to a terminal device, where the indication information is used to indicate a sending mode in which the terminal device sends a demodulation reference signal and a processing mode in which the terminal device performs precoding processing on uplink data to be sent;
a receiving unit, configured to receive, when the indication information indicates that the terminal device sends, to the access network device, a demodulation reference signal that is not precoded and corresponds to each sub-band in a full bandwidth and uplink data that is precoded and corresponds to each sub-band, the demodulation reference signal that is not precoded and corresponds to each sub-band and the uplink data that is precoded and corresponds to each sub-band and is sent by the terminal device;
a calculating unit, configured to calculate, according to the demodulation reference signal without precoding corresponding to each sub-band, a channel response coefficient matrix corresponding to each sub-band;
a calculating unit, configured to calculate an uplink equivalent channel matrix of each sub-band according to the channel response coefficient matrix corresponding to each sub-band and a precoding matrix corresponding to each sub-band, where the precoding matrix is a matrix adopted when precoding-processed uplink data corresponding to each sub-band;
and the obtaining unit is used for obtaining the original uplink data in the full bandwidth according to the uplink equivalent channel matrix corresponding to each sub-band and the pre-coded uplink data corresponding to each sub-band.
8. The access network device of claim 7, wherein the receiving unit is further configured to:
receiving a sounding reference signal sent by the terminal equipment;
the access network device further includes:
the judging unit is used for judging that the power difference value of adjacent sub-bands on the uplink channel is larger than a preset threshold value according to the sounding reference signal;
a generating unit, configured to generate the indication information when the power difference is greater than a preset threshold, where the indication information is used to instruct the terminal device to send a demodulation reference signal to the access network device without precoding and to process the uplink data to be sent in a sub-band precoding manner;
the generating unit is configured to generate the indication information when the power difference is smaller than a preset threshold, where the indication information is used to instruct the terminal device to send a precoded demodulation reference signal to the access network device and to process the uplink data to be sent in a full-band precoding manner.
9. The access network equipment according to claim 7 or 8, wherein the indication information comprises downlink control information, DCI, or radio resource control, RRC, signaling.
10. A terminal device, characterized in that the terminal device comprises:
a receiving unit, configured to receive indication information sent by an access network device, where the indication information is used to indicate a sending mode in which the terminal device sends a demodulation reference signal and a processing mode in which the terminal device performs precoding processing on uplink data to be sent;
a determining unit, configured to determine, according to the indication information, to send to the access network device a demodulation reference signal that is not precoded and corresponds to each subband, and to process uplink data to be sent in a subband precoding manner;
and a sending unit, configured to send, to the access network device, the demodulation reference signal that is not subjected to precoding processing and the uplink data that is subjected to precoding processing and corresponds to each sub-band.
11. The terminal device according to claim 10, wherein the sending unit is further configured to:
and sending a sounding reference signal to the access network equipment.
12. The terminal device according to claim 10 or 11, wherein the indication information comprises downlink control information, DCI, or radio resource control, RRC, signaling.
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