WO2022048593A1

WO2022048593A1 - Method and device for channel measurement

Info

Publication number: WO2022048593A1
Application number: PCT/CN2021/116199
Authority: WO
Inventors: 范利; 葛士斌; 汪洁; 袁一凌; 种稚萌; 毕晓艳
Original assignee: 华为技术有限公司
Priority date: 2020-09-02
Filing date: 2021-09-02
Publication date: 2022-03-10
Also published as: CN114204970A

Abstract

Provided in the present application are a method and device for channel measurement. A terminal side receives a precoded reference signal from a network side, the precoded signal corresponding to one or more ports, the terminal side performs channel measurement on the basis of the precoded reference signal and of a terminal device-specific first latency and acquires a superposition coefficient corresponding to the ports, where the first latency can be indicated by the network side and can also be determined by the terminal side itself. In order for the network side to determine a codebook employed, the terminal side transmits first indication information, the first indication information being used for indicating the superposition coefficient. The present application, during channel measurement, takes into consideration the first latency specific to terminal devices, while mitigating the impact of a latency offset caused by an uplink-downlink timing error, reduces interference among multiple user CSI-RS, increases CSI-RS reuse rate, and reduces CSI-RS overhead.

Description

Method and apparatus for channel measurement

technical field

The present application relates to the field of communication, and more particularly, to a method and a communication device for channel measurement.

Background technique

In massive multiple-input multiple-output (Massive MIMO) technology, the network device sends data to the terminal device, and it needs to rely on the channel state information (CSI) fed back by the terminal device to the network device. The CSI fed back by the terminal equipment has a great effect on the performance of the system.

In some systems, such as frequency division duplex (FDD) systems, uplink and downlink physical channels have partial reciprocity, such as reciprocity of multipath angle and reciprocity of time delay. Therefore, the CSI acquisition scheme can be designed based on partial reciprocity.

Based on the idea of partial reciprocity, the uplink channel information can be used to estimate part of the prior information, including the angle and delay information of the uplink channel, and then the network device loads the obtained angle or delay on the downlink pilot, and notifies the terminal device to go to the Measure and feed back the supplementary information that network devices need to obtain. Finally, the network device reconstructs the downlink channel or precoding according to the information measured by the uplink pilot and the supplementary information fed back by the terminal device.

However, when the multi-user network equipment loads the delay on the downlink pilot, how to perform the delay offset will not cause interference between the multi-user channel state information-reference signals (CSI-RS). , will not reduce the CSI-RS multiplexing rate and will not increase the CSI-RS overhead, which is an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a channel measurement method and a communication device, so as to reduce the influence of time delay deviation caused by uplink and downlink timing errors when performing channel estimation based on the idea of partial reciprocity, and at the same time reduce the interference between multi-user CSI-RS , improve the CSI-RS multiplexing rate and reduce the CSI-RS overhead.

In a first aspect, a method for channel measurement is provided. The method may be executed by a first apparatus, and the first apparatus may be a terminal device, or may also be executed by a chip, a chip system or a circuit configured in the terminal device, which is not limited in this application.

The method may include: receiving a precoding reference signal, where the precoding reference signal corresponds to one or more ports; and performing channel measurement based on the precoding reference signal and a terminal-specific first delay to obtain each of the ports corresponding superposition coefficient; and send first indication information, where the first indication information is used to indicate the superposition coefficient.

Based on the above technical solutions, considering the specific first delay for each terminal device during channel measurement, it can reduce the influence of the delay deviation caused by the uplink and downlink timing errors, reduce the interference between multi-user CSI-RS, and improve the CSI-RS. RS multiplexing rate and reduce CSI-RS overhead.

With reference to the first aspect, in some possible implementations, the method further includes receiving second indication information, where the second indication information is used to indicate a second delay specific to the terminal device. It can be understood that the specific first delay of the terminal device can be obtained according to the second delay indicated by the network side.

With reference to the first aspect, in some possible implementation manners, the method further includes sending fourth indication information, where the fourth indication information is used to indicate the first delay. It can be understood that the terminal side can indicate the first delay specific to the terminal device to the network side, so as to realize the alignment of the network side and the terminal side when the first delay is determined by the terminal side.

With reference to the first aspect, in some possible implementation manners, the method further includes sending third indication information, where the third indication information is used to indicate a port selection matrix of the port.

In a second aspect, a method for channel measurement is provided. The method may be executed by a second apparatus, which may be a network device, or may also be executed by a chip, a chip system, or a circuit configured in the network device, which is not limited in this application.

The method may include: generating a precoding reference signal, where the precoding reference signal corresponds to one or more ports; sending the precoding reference signal; and receiving first indication information, where the first indication information is used to indicate each of the The superposition coefficient corresponding to the port, where the superposition coefficient is associated with the first delay specific to the terminal device.

With reference to the second aspect, in some possible implementation manners, the method further includes sending second indication information, where the second indication information is used to indicate a second delay specific to the terminal device. It can be understood that the specific first delay of the terminal device can be obtained according to the second delay indicated by the network side.

With reference to the second aspect, in some possible implementations, the method further includes receiving fourth indication information, where the fourth indication information is used to indicate the first delay. It can be understood that the terminal side can indicate the first delay specific to the terminal device to the network side, so as to realize the alignment of the network side and the terminal side when the first delay is determined by the terminal side.

With reference to the second aspect, in some possible implementations, the method further includes receiving third indication information, where the third indication information is used to indicate a port selection matrix of the port.

With reference to the first aspect or the second aspect, in some possible implementations, the superposition coefficients corresponding to the respective ports are used to determine the first codebook, and the first codebook satisfies

Wherein W ₁ is the port selection matrix of the port, W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and W _f is the frequency component matrix,

represents the conjugate transpose of W _f , Q is the diagonal matrix of the first delay correlation, and Q ^H represents the conjugate transpose of Q. It can be understood that the novel codebook structure can improve the calculation accuracy of the codebook.

Wherein W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports in the superposition coefficients corresponding to the respective ports; W _f is the frequency component matrix,

In combination with the first aspect or the second aspect, in some possible implementations, the Q is:

The elements on the diagonal are

f _k represents the frequency of the kth subband, k=1, 2,...,K, K is the number of subbands, and τ ^* is the first delay; or

Where o=0,1,...,O-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the oversampled discrete Fourier transform DFT codebook, and O is associated with the first delay; or

The elements on the diagonal are

f _k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ ^* +τ _TA ) is the first delay, and τ ^* is the uplink delay , τ _TA is the uplink and downlink timing offset; or

Where o=0,1,...,O-1, o'=0,1,...,O'-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the first oversampling discrete Fourier transform DFT codebook, O' is the number of columns of the second oversampling discrete Fourier transform DFT codebook, O and O' are the same as The first time delay is associated.

It can be understood that the first oversampling discrete Fourier transform DFT codebook may be determined by a network device, and the second oversampling discrete Fourier transform DFT codebook may be determined by a terminal device, that is, O is determined by a network device. OK, O' is determined by the terminal device.

With reference to the first aspect or the second aspect, in some possible implementations, the second indication information includes information of the second time delay, or the second indication information includes oversampling discrete Fourier transform DFT The index of the codebook. It can be understood that the second indication information may directly or indirectly indicate the second delay.

With reference to the first aspect or the second aspect, in some possible implementation manners, the second delay is the first delay. It can be understood that the second delay indicated by the network side is the first delay, and the terminal side directly uses the delay indicated by the network side to perform channel measurement, which reduces computational complexity.

With reference to the first aspect or the second aspect, in some possible implementation manners, the first delay is a delay determined within a predetermined delay range corresponding to the second delay. It can be understood that the second delay indicated by the network side is only for reference, and the terminal side needs to further determine the first delay, so as to avoid inaccurate channel measurement when there is a timing deviation between uplink and downlink, and improve the accuracy of channel measurement, and The first delay is determined within a certain range based on the delay indicated by the reference network side, which reduces the amount of calculation and processing complexity.

With reference to the first aspect or the second aspect, in some possible implementation manners, the first delay is a delay obtained by estimating a delay adjustment amount. It can be understood that the network side may not perform delay offset, and the terminal side directly determines the first delay, which improves the accuracy of channel measurement.

With reference to the first aspect or the second aspect, in some possible implementations, the fourth indication information includes information about the first time delay, or the fourth indication information includes information for obtaining the first time delay Information about the delay adjustment amount of the delay. It can be understood that the fourth indication information may directly or indirectly indicate the first delay.

In a third aspect, an apparatus for channel measurement is provided, and the apparatus may be a communication apparatus, configured to execute the communication method provided in the above-mentioned first aspect. Specifically, the apparatus may include a unit and/or a module for executing the communication method provided by the first aspect, such as a processing unit and/or a communication unit.

In an implementation manner, the apparatus is a terminal device. When the apparatus is a terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be a processor.

In another implementation manner, the apparatus is a chip or a chip system configured in a terminal device. When the device is a chip or a chip system configured in a terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip or the chip system; The processing unit may be a processor, a processing circuit, a logic circuit, or the like.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a fourth aspect, an apparatus for channel measurement is provided, and the apparatus may be a communication apparatus for executing the communication method provided in the second aspect. Specifically, the apparatus may include a unit and/or a module for executing the communication method provided by the second aspect, such as a processing unit and/or a communication unit.

In one implementation, the apparatus is a network device. When the apparatus is a network device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be a processor.

In another implementation manner, the apparatus is a chip or a chip system configured in a network device. When the device is a chip or a chip system configured in a network device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip or the chip system; The processing unit may be a processor, a processing circuit, a logic circuit, or the like.

In a fifth aspect, a processing apparatus is provided, including a processor. The processor is coupled to the memory, and can be used to execute instructions in the memory, so as to implement the communication method of the above-mentioned first aspect in any possible implementation manner of the first aspect. Optionally, the processing device further includes a memory. Optionally, the processing device further includes a communication interface to which the processor is coupled, and the communication interface is used for inputting and/or outputting information. The information includes at least one of instructions and data.

In an implementation manner, the processing apparatus is a terminal device. When the processing device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the processing device is a chip or a system of chips. When the processing device is a chip or a chip system, the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or a chip system. The processor may also be embodied as a processing circuit or a logic circuit.

In another implementation manner, the processing device is a chip or a chip system configured in the terminal device.

In a sixth aspect, a processing apparatus is provided, including a processor. The processor is coupled to the memory and can be used to execute instructions in the memory to implement the second aspect and the communication method in any possible implementation manner of the second aspect. Optionally, the processing device further includes a memory. Optionally, the processing device further includes a communication interface to which the processor is coupled, and the communication interface is used for inputting and/or outputting information. The information includes at least one of instructions and data.

In an implementation manner, the processing apparatus is a network device. When the processing device is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation manner, the processing device is a chip or a chip system configured in a network device.

In a seventh aspect, a computer-readable storage medium is provided on which a computer program is stored, and when the computer program is executed by a communication device, the communication device enables the communication device to realize the first aspect and any possible implementation manner of the first aspect communication method in .

In an eighth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a communication device, enables the communication device to realize the second aspect and any possible implementation manner of the second aspect communication method in .

A ninth aspect provides a computer program product comprising instructions, which when executed by a computer cause a communication apparatus to implement the communication method provided in the first aspect.

A tenth aspect provides a computer program product comprising instructions, which when executed by a computer cause a communication apparatus to implement the communication method provided by the second aspect.

In an eleventh aspect, a communication system is provided, including the aforementioned network device and terminal device.

Description of drawings

1a and 1b are schematic diagrams of a communication system applicable to an embodiment of the present application;

Fig. 2 is a schematic diagram of uniformly shifting to delay 0 for all users;

3 is a schematic diagram of a method for channel measurement according to an embodiment of the present application;

4 is a schematic diagram of a method for channel measurement according to another embodiment of the present application;

5 is a schematic diagram of a method for channel measurement according to yet another embodiment of the present application;

6 is a schematic block diagram of a communication device provided by an embodiment of the present application;

7 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a network device provided by an embodiment of the present application.

detailed description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), universal mobile telecommunication system (UMTS), fifth generation (5th generation, 5G) mobile communication system or new radio (NR), etc. The 5G mobile communication system may include a non-standalone (NSA, NSA) and/or an independent network (standalone, SA).

The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system. The communication system may also be a PLMN network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, an internet of things (IoT) network, or other networks. The IoT network may include, for example, the Internet of Vehicles. Among them, the communication methods in the Internet of Vehicles system are collectively referred to as V2X (X stands for anything). For example, the V2X communication includes: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication ) communication, vehicle-to-pedestrian (V2P) or vehicle-to-network (V2N) communication, etc.

The terminal equipment in the embodiments of the present application may also be referred to as: user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), access terminal, subscriber unit, subscriber station, Mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, terminal device, wireless communication device, user agent or user equipment, etc.

The terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device with a wireless connection function, a vehicle-mounted device, and the like. At present, some examples of terminals are: mobile phone (mobile phone), tablet computer, notebook computer, PDA, mobile internet device (MID), wearable device, virtual reality (virtual reality, VR) device, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, and smart grids wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol , SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, automotive A device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., are not limited in this embodiment of the present application.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the present application, the terminal device may also be a terminal device in the IoT system. IoT is an important part of the future development of information technology. Interconnection, the intelligent network of the interconnection of things and things. In the embodiment of the present application, the IoT technology can achieve massive connections, deep coverage, and power saving of the terminal through, for example, a narrowband (narrow band) NB technology.

In addition, in the embodiment of the present application, the terminal device may also include sensors such as smart printers, train detectors, and gas stations, and the main functions include collecting data (part of terminal devices), receiving control information and downlink data of network devices, and sending electromagnetic waves. , to transmit uplink data to the network device.

In addition, the network device in this embodiment of the present application may be a device for communicating with terminal devices, and the network device may be an evolved NodeB (evolved NodeB, eNB or eNodeB) in an LTE system, or a cloud wireless access network A wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network in a future evolved PLMN network Devices, etc., are not limited in the embodiments of the present application.

The network device in this embodiment of the present application may be a device in a wireless network, for example, a radio access network (radio access network, RAN) node that accesses a terminal to the wireless network. At present, some examples of RAN nodes are: next-generation base station gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB), home base station, baseband unit (baseband unit, BBU), or Access point (access point, AP) in WiFi system, etc.

In a network structure, a network device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node, or a control plane CU node (CU). - RAN equipment for CP nodes) and user plane CU nodes (CU-UP nodes) and DU nodes.

In this embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. This hardware layer includes hardware such as central processing unit (CPU), memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. In addition, the embodiments of the present application do not specifically limit the specific structure of the execution body of the methods provided by the embodiments of the present application, as long as the program that records the codes of the methods provided by the embodiments of the present application can be executed to provide the methods provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute a program.

Additionally, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer readable device, carrier or medium. For example, computer readable media may include, but are not limited to: magnetic storage devices (eg, hard disks, floppy disks, or magnetic tapes, etc.), optical disks (eg, compact discs (CDs), digital versatile discs (DVDs) etc.), smart cards and flash memory devices (eg, erasable programmable read-only memory (EPROM), card, stick or key drives, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

To facilitate understanding of the embodiments of the present application, firstly, a communication system applicable to the embodiments of the present application is described in detail with reference to FIG. 1a and FIG. 1b.

FIG. 1a is a schematic diagram of a wireless communication system 100 suitable for this embodiment of the present application. As shown in FIG. 1, the wireless communication system 100 may include at least one network device, such as the network device 111 shown in FIG. 1a, and the wireless communication system 100 may also include at least one terminal device, such as the terminal device 121 shown in FIG. 1a. to the terminal device 123. Both the network device and the terminal device can be configured with multiple antennas, and the network device and the terminal device can communicate using the multi-antenna technology.

Wherein, when the network device communicates with the terminal device, the network device can manage one or more cells, and there can be an integer number of terminal devices in one cell. Optionally, the network device 111 and the terminal device 121 to the terminal device 123 form a single-cell communication system, and without loss of generality, the cell is denoted as cell #1. The network device 111 may be a network device in cell #1, or in other words, the network device 111 may serve a terminal device (eg, terminal device 121) in cell #1.

It should be noted that a cell can be understood as an area within the coverage range of a wireless signal of a network device.

FIG. 1b is another schematic diagram of a wireless communication system 200 suitable for the embodiment of the present application. As shown in FIG. 2 , the technical solutions of the embodiments of the present application can also be applied to D2D communication. The wireless communication system 200 includes a plurality of terminal devices, such as terminal device 124 to terminal device 126 in FIG. 1b. Communication between the terminal device 124 and the terminal device 126 can be performed directly. For example, terminal device 124 and terminal device 125 may transmit data to terminal device 126 individually or simultaneously.

It should be understood that the above-mentioned FIG. 1 a and FIG. 1 b are only exemplary descriptions, and the present application is not limited thereto. For example, the embodiments of the present application can be applied to any communication system as long as there are at least two devices in the communication system, wherein one device needs to send a precoding reference signal; the other device receives the precoding reference signal and performs channel measurement And feedback channel state information.

To facilitate understanding of the embodiments of the present application, the following briefly introduces several terms involved in the present application.

1. Precoding technology: When the channel state is known, the network device can process the signal to be sent with the help of a precoding matrix that matches the channel state, so that the precoded signal to be sent is adapted to the channel, thereby This reduces the complexity for the receiving device to eliminate the influence between channels. Therefore, the received signal quality (eg, signal to interference plus noise ratio (SINR), etc.) is improved through the precoding process of the signal to be transmitted. Therefore, by using precoding technology, the transmitting device and multiple receiving devices can transmit on the same time-frequency resources, that is, multi-user multiple input multiple output (MU-MIMO) is realized.

It should be understood that the relevant descriptions of the precoding technology herein are only examples for ease of understanding, and are not used to limit the protection scope of the embodiments of the present application. In a specific implementation process, the sending device may also perform precoding in other manners. For example, in the case where the channel information (eg, but not limited to, the channel matrix) cannot be obtained, a preset precoding matrix or a weighting processing method is used to perform precoding and the like. For the sake of brevity, the specific content will not be repeated here.

2. Channel reciprocity: In the time division duplexing (TDD) mode, the uplink and downlink channels transmit signals on different time domain resources on the same frequency domain resource. Within a relatively short time (eg, the coherence time of channel propagation), it can be considered that the channel fading experienced by the signals on the uplink and downlink channels is the same. This is the reciprocity of the uplink and downlink channels. Based on the reciprocity of the uplink and downlink channels, the network device can measure the uplink channel according to the uplink reference signal, such as the sounding reference signal (SRS), and can estimate the downlink channel according to the uplink channel, so that it can be determined for downlink transmission. the precoding matrix.

The uplink and downlink channels in frequency division duplexing (FDD) mode have partial reciprocity, for example, the reciprocity of angle and the reciprocity of delay, in other words, the delay and angle in FDD The uplink and downlink channels in this mode are reciprocal. Therefore, angle and delay can also be called reciprocity parameters.

Since the signal is transmitted through the wireless channel, there are multiple paths from the transmitting antenna to the receiving antenna. The multipath delay causes frequency selective fading, which is the change of the frequency domain channel. Delay is the transmission time of wireless signals on different transmission paths, which is determined by distance and speed, and has nothing to do with the frequency domain of wireless signals. When signals are transmitted on different transmission paths, there are different transmission delays due to different distances. Therefore, the uplink and downlink channels in the FDD mode with time delay can be considered to be the same, or reciprocal.

In addition, the angle may refer to the angle of arrival (AOA) at which the signal reaches the receiving antenna via the wireless channel, or may refer to the angle of departure (AOD) of the signal transmitted through the transmitting antenna. In this embodiment of the present application, the angle may refer to the arrival angle of the uplink signal reaching the network device, or may refer to the departure angle of the network device transmitting the downlink signal. The arrival angle of the uplink reference signal and the departure angle of the downlink reference signal can be considered to be the same, or reciprocal. Therefore, the angle of the uplink and downlink channels in the FDD mode is reciprocal.

3. Reference signal (reference signal, RS): It may also be called a pilot (pilot), a reference sequence, and the like. In this embodiment of the present application, the reference signal may be a reference signal used for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI-RS) used for downlink channel measurement, or may be a sounding reference signal (Sounding reference signal, SRS) used for uplink channel measurement. It should be understood that the reference signals listed above are only examples, and should not constitute any limitation to the present application. This application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

The precoding reference signal may be a reference signal obtained by precoding the reference signal. The precoding may specifically include beamforming (beamforming) and/or phase rotation. The beamforming can be implemented by, for example, precoding the downlink reference signal based on one or more angle vectors, and the phase rotation can be implemented by, for example, precoding the downlink reference signal with one or more delay vectors.

In the embodiments of the present application, for the convenience of distinction and description, a reference signal obtained by precoding, such as beamforming and/or phase rotation, is referred to as a precoded reference signal; a reference signal without precoding is referred to as a reference signal for short .

In this embodiment of the present application, precoding the downlink reference signal based on one or more angle vectors may also be referred to as loading one or more angle vectors onto the downlink reference signal to implement beamforming. Precoding the downlink reference signal based on one or more delay vectors may also be referred to as loading one or more delay vectors onto the downlink reference signal to implement phase rotation. Precoding the downlink reference signal based on one or more delay vectors may also be referred to as loading one or more relative delay vectors onto the downlink reference signal to implement phase rotation. The relative time delay will be specifically described in the following embodiments.

4. Port: It can be understood as a virtual antenna recognized by the receiving device. In this embodiment of the present application, a port may refer to a reference signal transmission port or a transmit antenna port. For example, the reference signal of each port may be an unprecoded reference signal, or a reference signal based on at least one delay vector. The precoding reference signal obtained by precoding; the port may also refer to the reference signal port after beamforming, for example, the reference signal corresponding to each port may be the precoding obtained by precoding the reference signal based on an angle vector The reference signal may also be a precoded reference signal obtained by precoding the reference signal based on an angle vector and a delay vector. The signal of each port can be transmitted through one or more resource blocks (RBs).

The transmit antenna port may refer to an actual independent transmit unit (transceiver unit, TxRU). It can be understood that if spatial domain precoding is performed on the reference signal, the number of ports may refer to the number of reference signal ports, and the number of reference signal ports may be smaller than the number of transmit antenna ports.

In the embodiments shown below, when referring to transmit antenna ports, it may refer to the number of ports that are not subjected to spatial precoding. That is, it is the actual number of independent transmission units. When referring to a port, in different embodiments, it may refer to a transmit antenna port or a reference signal port. The specific meaning expressed by the port can be determined according to the specific embodiment.

5. Angle vector: It can be understood as a precoding vector used for beamforming the reference signal. Through beamforming, the transmitted reference signal can have a certain spatial directivity. Therefore, the process of precoding the reference signal based on the angle vector can also be regarded as a process of spatial domain (or simply, spatial domain) precoding.

The number of ports of the precoded reference signal obtained by precoding the reference signal based on one or more angle vectors is the same as the number of angle vectors.

Optionally, the angle vector is taken from an (oversampled) Discrete Fourier Transform (DFT) matrix.

The reference signal loaded with the angle vector can be transmitted to the terminal device through the downlink channel, so the channel measured by the terminal device according to the received precoding reference signal is equivalent to the channel loaded with the angle vector.

It should be understood that the angle vector is a form proposed in this application for representing the angle. The angle vector is named only for convenience in distinguishing it from the time delay, and should not constitute any limitation to the present application. This application does not exclude the possibility of defining other names in future agreements to represent the same or similar meanings.

6. Frequency domain unit: a unit of frequency domain resources, which can represent different granularity of frequency domain resources. The frequency domain unit may include, but is not limited to, a subband (subband), a resource block (RB), a resource block group (RBG), a precoding resource block group (PRG), etc. .

In this embodiment of the present application, the network device may determine a precoding matrix corresponding to each frequency domain unit based on feedback from the terminal device.

7. Terminal device-specific (can be called UE-specific) delay: user-specific delay, for the terminal device, the network device shifts the delay observed by each port on the terminal side to the delay (in the delay It can be embodied as a certain delay tap in the domain, the delay is specific to the terminal equipment, the delay of different terminal equipment can be different or the same), which is equivalent to the specific delay component to which the equivalent channel of the terminal equipment is moved , is the offset to which the path delay is offset, the path delay is the centering delay of the angle delay corresponding to a certain path (it can be a relative delay or an absolute delay), and the angle delay is the Can be a combination of an angle vector and a delay vector. Each angle-delay pair may include an angle vector and a delay vector. The angle vectors and/or delay vectors contained in any two angle-delay pairs are different. In other words, each angle-delay pair can be uniquely determined by an angle vector and a delay vector. It should be understood that the angle-delay pair can be understood as a representation of the space-frequency basic unit determined by an angle vector and a time-delay vector, but it is not necessarily the only representation. For example, it can also be expressed as a space-frequency component matrix, a space-frequency component vector, and the like.

A space-frequency component matrix can be determined by an angle-delay pair. In other words, a space-frequency component matrix can be uniquely determined by an angle vector and a delay vector. A space-frequency component matrix and an angle-delay pair can be converted to each other. The space-frequency matrix may be an intermediate quantity used to determine the precoding matrix.

Regarding the space-frequency component matrix and the space-frequency component vector, reference may be made to the description of the prior art, which is not limited in this embodiment of the present application.

8. Delay offset: The delay offset mentioned in this application is that the network side offsets the original channel delay (can be recorded as τ) to the destination delay (can be recorded as τ' or τ ^* ), and also That is, after performing the delay offset, the equivalent channel delay observed by the terminal side is τ' or τ ^* .

9. Reference signal resources: The reference signal resources can be used to configure the transmission properties of the reference signal, such as time-frequency resource location, port mapping relationship, power factor, and scrambling code, etc. For details, please refer to the prior art. The transmitting end device may transmit the reference signal based on the reference signal resource, and the receiving end device may receive the reference signal based on the reference signal resource. One reference signal resource may include one or more RBs.

In this embodiment of the present application, the reference signal resource may be, for example, a CSI-RS resource.

10. FDD downlink channel reconstruction (also known as CSI acquisition based on FDD partial reciprocity):

The CSI-based downlink channel reconstruction method of the FDD system includes the following steps:

Step 1: the network device receives the SRS sent by the terminal device, and uses the uplink SRS to estimate the information (for example, direction angle, time delay, etc.) that the uplink and downlink have reciprocity;

Step 2: The network device sends the downlink reference signal to the terminal device. Specifically, the network device loads the obtained uplink and downlink reciprocity information (which may include the offset of the delay component) on the downlink reference signal, and notifies the terminal The device measures and feeds back the supplementary information that the network device needs to obtain;

Step 3: The terminal device re-estimates and feeds back supplementary information by using the downlink reference signal (for example, it may be the full-band complex amplitude corresponding to each port, that is, the superposition coefficient corresponding to each port);

Step 4: The network device uses the information obtained in the first and third steps to reconstruct the downlink channel, that is, according to the obtained information and the predetermined codebook structure, determine a precoding matrix that matches the channel state to process the signal to be sent, The precoded signal to be sent is adapted to the channel.

11. Subband: It can also be called a subcarrier, which is used to carry signals, occupies a bandwidth in the frequency domain, and can be embodied as a resource element (RE). The subbands mentioned in this application are subbands used to transmit CSI-RS.

12. The superposition coefficient corresponding to the port: it can also be called the full-band complex amplitude corresponding to the port, and the superposition coefficient corresponding to the transmitting port. In a specific case, the superposition coefficient corresponding to the port can be the complex amplitude of the path. The projection coefficient on the precoding vector is the superposition coefficient corresponding to the CSI-RS port. The UE feeds back the superposition coefficient corresponding to each transmission port to the network device. The network device reconstructs the downlink channel by using the direction angle and time delay of each path estimated in the uplink and the superposition coefficient of each transmission port re-evaluated and fed back by the UE.

In addition, in order to facilitate understanding of the embodiments of the present application, the following points are described.

First, in this application, "for indicating" may include both for direct indication and for indirect indication. When describing a certain indication information for indicating A, the indication information may directly indicate A or indirectly indicate A, but it does not mean that A must be carried in the indication information.

The information indicated by the indication information is called the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the information to be indicated. Indicating the index of information, etc. The information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be implemented by means of a pre-agreed (for example, a protocol stipulated) arrangement order of various information, so as to reduce the indication overhead to a certain extent.

The information to be indicated may be sent together as a whole, or may be divided into multiple sub-information and sent separately, and the transmission periods and/or transmission timings of these sub-information may be the same or different. The specific sending method is not limited in this application. The sending period and/or sending timing of these sub-information may be predefined, for example, predefined according to a protocol, or configured by the transmitting end device by sending configuration information to the receiving end device. Wherein, the configuration information may include, for example, but not limited to, one or a combination of at least two of radio resource control signaling, media access control (media access control, MAC) layer signaling, and physical layer signaling. Among them, the radio resource control signaling, such as packet radio resource control (radio resource control, RRC) signaling; MAC layer signaling, for example, includes MAC control element (control element, CE); physical layer signaling, for example, includes downlink control information (downlink control information). information, DCI).

Second, in the embodiments shown below, the first, the second, and various numeral numbers are only for the convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, the first and the second may be distinguished as types in the embodiments of the present application, and not as object contents.

Third, the "storage" involved in the embodiments of the present application may refer to storage in one or more memories. The one or more memories may be set separately, or may be integrated in an encoder or a decoder, a processor, or a communication device. The one or more memories may also be partially provided separately and partially integrated in the decoder, processor, or communication device. The type of memory may be any form of storage medium, which is not limited in this application.

Fourth, the "protocols" involved in the embodiments of this application may refer to standard protocols in the communication field, such as LTE protocols, NR protocols, WLAN protocols, and related protocols in other communication systems, which are not limited in this application.

Fifth, "at least one" means one or more, and "plurality" means two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b and c can represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , b and c. Where a, b and c can be single or multiple respectively.

Sixth, the DFT involved in the embodiments of the present application may be oversampling or may not be oversampling. Therefore, hereinafter, "(oversampling) discrete Fourier transform DFT" or "(oversampling) DFT" is uniformly used to indicate that it can be either an oversampling DFT or a DFT without oversampling.

In 5G communication systems, large-scale multi-antenna technology plays a crucial role in the spectral efficiency of the system. When the MIMO technology is used, when the network device sends data to the terminal device, modulation coding and signal precoding need to be performed. How the network device sends data to the terminal device depends on the channel state information (CSI) fed back by the terminal device to the network device, which has a huge impact on the performance of the system.

In the TDD system, since the uplink channel and the downlink channel use the same bandwidth, the uplink channel and the downlink channel are reciprocal, and the network device side can use the reciprocity of the uplink channel and the downlink channel to obtain the CSI of the downlink channel through the uplink channel. Further, signal precoding is performed.

In the FDD system, the network device side can use the partial reciprocity of FDD to send reciprocal information to the pilot, and the terminal device only needs to feed back the information without reciprocity (such as information other than angle and delay) . The complete CSI of the downlink channel can be acquired by combining the reciprocal information obtained by the network device through the uplink channel and the non-reciprocal information fed back by the terminal device.

The network device needs to use the uplink channel information to estimate part of the prior information, including the angle and delay information of the uplink channel. The network equipment projects on a certain spatial base (S) ensemble or a frequency domain base (F) ensemble to obtain the corresponding optimal angle and delay estimates. H _UL represents the space-frequency matrix obtained by the uplink channel measurement.

H _UL can be expressed as: H _UL =SC _UL F ^H .

Among them, S corresponds to airspace information, and physically corresponds to the arrival angle/departure angle of the network device. S can represent a matrix constructed from one or more angle vectors. F corresponds to frequency domain information, and physically corresponds to the multipath delay of the multipath signal reaching the network device. F can represent a matrix constructed from one or more delay vectors. C may represent weighting coefficients corresponding to an angle vector and a delay vector. C _UL represents the coefficient matrix corresponding to the uplink channel. The superscript H represents the conjugate transpose, for example, F ^H represents the conjugate transpose of the matrix (or vector) F.

The network device loads the angle-delay pair on the pilot, and the terminal device performs channel measurement according to the received pilot signal to obtain the superposition coefficient of the corresponding angle-delay pair.

When the network device loads the angle-delay pair on the pilot, it can do a delay offset, but if it is aimed at multiple users, it defaults to a unified delay offset, that is, the default equivalent channels of different UEs are uniformly offset to a certain delay. For example, as shown in Figure 2, the user-specific delay is not determined for different users, but is uniformly shifted to the position where the delay tap is 0 in the delay domain for all users. The interference between multi-user channel state information-reference signals (CSI-RS) reduces the CSI-RS multiplexing rate and the problems of excessive CSI-RS overhead.

In view of this, the present application proposes a method, which can reduce the influence of the delay deviation caused by the uplink and downlink timing errors, and reduce the multi-user CSI-RS by using the specific delay for each UE, that is, the UE-specific first delay. Interference, improve CSI-RS multiplexing rate and reduce CSI-RS overhead.

The various embodiments provided by the present application will be described in detail below with reference to the accompanying drawings. The description of the following embodiments mainly takes the system shown in FIG. 1a as an example, but is not limited thereto.

FIG. 3 is a schematic interaction diagram of a method 300 for channel measurement provided by an embodiment of the present application. Method 300 may include the following steps.

310. The terminal device receives a precoding reference signal.

Correspondingly, the network device generates the precoding reference signal, and sends the precoding reference signal, the precoding reference signal corresponds to one or more ports, and the port may be regarded as the port for sending the precoding reference signal.

The network device may precode the downlink reference signal based on information with reciprocity, and the information with reciprocity may be determined based on uplink channel measurement. For example, since the angle and the delay are reciprocal in the uplink and downlink channels, the network device may precode the downlink reference signal based on the angle vector and/or the delay vector determined based on the uplink channel measurement, so that the terminal device can use the precoded reference signal to precode the downlink reference signal. signal for channel estimation.

It should be understood that other information with reciprocity may also be used in the embodiments of the present application. The following mainly takes the angle and/or the time delay as an example for exemplary description.

Optionally, in this embodiment of the present application, the network device may precode the downlink reference signal based on the angle vector determined based on the uplink channel measurement.

Take T delay vectors as an example. where T≥1, and T is an integer. In this embodiment of the present application, each angle may be represented by an angle vector. Each delay can be characterized by a delay vector. Therefore, in this embodiment of the present application, an angle vector may represent an angle, and a delay vector may represent a delay. In the following, delay and delay vector are sometimes used interchangeably, and angle and angle vector are sometimes used interchangeably.

The T delay vectors may be determined based on uplink channel measurements. Alternatively, the T delay vectors may not be determined based on uplink channel measurements. For example, the T delay vectors may be predefined, as defined by a protocol; or, the T delay vectors may be statistically determined based on one or more previous downlink channel measurements. The present application does not limit the acquisition manner of the T delay vectors.

The number of delay vectors corresponding to one angle vector is not limited in this embodiment of the present application.

For example, in one possible design, T delay vectors correspond to each of the F angle vectors. In other words, any two angle vectors among the F angle vectors may correspond to the same T delay vectors.

For another example, in another possible design, one or more delay vectors among the T delay vectors may correspond to one angle vector among the F angle vectors. In other words, among the F angle vectors, delay vectors corresponding to at least two angle vectors are different.

The following takes F angle vectors as an example for illustration. Among them, F≥1, and F is an integer.

Optionally, the precoding reference signal is obtained by precoding the reference signal based on the F angle vectors.

The network device may precode a reference signal, such as a CSI-RS, based on each of the predetermined F angle vectors, to obtain precoded reference signals corresponding to the F ports. The precoding reference signal of each port may be obtained by precoding based on one angle vector among the F angle vectors.

Since the angle has the reciprocity of the uplink and downlink channels, the F angle vectors can be determined based on the uplink channel measurement. The network device may determine F stronger angles according to the uplink channel matrix obtained by pre-estimation. The F angles can be characterized by F angle vectors.

The F angle vectors may, for example, be taken from a predefined set of angle vectors. Optionally, each angle vector in the set of angle vectors is taken from an (oversampled) DFT matrix. Optionally, each angle vector in the angle vector set is a steering vector.

The network device may determine the F angle vectors by using, for example, a joint angle and delay estimation (joint angle and delay estimation, JADE) algorithm in the prior art. Specifically, the estimation algorithm can be, for example, a multiple signal classification algorithm (multiple signal classification algorithm, MUSIC), a Bartlett algorithm or a rotation invariant subspace algorithm (estimation of signal parameters via rotation invariant technique algorithm, ESPRIT), etc. . The network device may also determine the F angle vectors by performing (oversampling) DFT on the space-frequency matrix determined based on the uplink channel measurements. The present application does not limit the specific method for the network device to determine the F angle vectors.

It should be understood that the F angle vectors are not necessarily determined based on uplink channel measurements. For example, the F angle vectors may be predefined, as defined in a protocol; or, the F angle vectors may be statistically determined based on results fed back by one or more previous downlink channel measurements. The present application does not limit the manner of determining the F angle vectors.

The following will focus on the introduction from the perspective of the processing of the delay vector in the present application, and the processing of the angle vector will not be described in detail in the present application.

320. The terminal device performs channel measurement based on the precoding reference signal and the first time delay specific to the terminal device, and obtains a superposition coefficient corresponding to each of the ports.

The specific first delay of the terminal equipment may be indicated to the terminal equipment by the network equipment, may be determined by the terminal equipment within a predetermined delay range based on the indication of the network equipment, or may be determined by the terminal equipment through the estimation of the delay adjustment amount. Obtained, optionally, can be obtained by the terminal equipment in conjunction with each port (it can be said to be in conjunction with all ports) or in conjunction with some ports to estimate the delay adjustment amount. No matter how it is obtained, the first delay is a delay specific to the terminal device, or can also be said to be a delay dedicated to the terminal device. It should be understood that "the superposition coefficient corresponding to each of the ports" includes all superposition coefficients or part of the superposition coefficients corresponding to each of the ports. If there are 8 ports and all the superposition coefficients corresponding to each port are 4, then all the superposition coefficients corresponding to each of the ports have a total of 32 (8 times 4), and the "superposition coefficient corresponding to each of the ports" can be It is all the 32 superposition coefficients, and it can also be a part of the superposition coefficients (such as the superposition coefficients selected by the terminal device according to the preset rules), for example, the same number of superposition coefficients are selected for each port, or for each port. The port selects the superposition coefficients according to the preset rules. For port 1, there are 3 superposition coefficients that meet the predetermined conditions. For port 2, there are 4 superposition coefficients that meet the predetermined conditions. For port 3, there are 2 superposition coefficients that meet the predetermined conditions. , select 0 superposition coefficients that satisfy the predetermined condition for port 4, and so on. It should also be understood that if "the superposition coefficient corresponding to each of the ports" is a partial superposition coefficient corresponding to each of the ports, it is not excluded that the terminal device also obtained all the superposition coefficients corresponding to each of the ports, and it should be understood that "obtain" in 320 For the feedback information of the terminal device (the content indicated by the first indication information below), it is not excluded to obtain other information.

It can be understood that, based on the specific first delay of the terminal device, the terminal device may be directly based on the first delay, or may be indirectly based on the first delay, for example, based on information associated with the first delay (through the The associated information can be obtained from the first delay), for example, the (oversampled) DFT frequency-domain vector corresponding to the first delay (eg, w _q and/or w′ _q in the following).

In the following embodiments, channel measurements in different acquisition modes of the first delay will be described respectively.

330. The terminal device sends the first indication information.

The corresponding network device receives the first indication information, where the first indication information is used to indicate the superposition coefficient.

The first indication information may directly carry the superposition coefficient, or may carry a parameter associated with the superposition coefficient, or a deformation form of the superposition coefficient, etc. In a word, the first indication information can directly or indirectly indicate the the superposition factor. It can be understood that the first indication information may be delivered through one or more signalings, which is not limited in this application.

The superposition coefficients corresponding to the respective ports are used to determine the first codebook. It should be understood that all the descriptions referring to "each port" in this application are intended to emphasize that each port in all ports must be considered, "each port" should be considered. The superposition coefficient corresponding to the port" means that the superposition coefficient corresponding to each port is considered in all ports, that is, the collection of superposition coefficients corresponding to each port. Then "the superposition coefficients corresponding to each port are used to determine the first codebook" can be understood as "the superposition coefficients corresponding to each of all the ports are used to determine the first codebook together"; for example, there are P ports, and each port corresponds to The superposition coefficients (which can be all the superposition coefficients corresponding to each port, or the corresponding partial superposition coefficients) are L', then there are PL' superposition coefficients used to determine the first codebook, where P, L ' is an integer greater than or equal to 1, and PL' means P multiplied by L'.

The first codebook satisfies

That is to say, the structure of the first codebook can be directly

It can also be in other forms, as long as it meets the

That’s enough (for example, the first codebook structure may be W=W ₁ W ₂ W′ _f ^H , where W′ _f =QW _f , that is, the first codebook satisfies

). Wherein W ₁ is the port selection matrix of the port, W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports (denoted as case 1), or W ₂ can be the superposition coefficient of the superposition coefficients corresponding to the selected ports matrix (denoted as case 2), W _f is the frequency component matrix (also known as frequency domain basis vector matrix),

represents the conjugate transpose of W _f , Q is the diagonal matrix of the first delay correlation, and Q ^H represents the conjugate transpose of Q. In the following embodiments, the codebook structure will be described respectively according to the channel measurement in different acquisition modes of the first delay.

The above _- mentioned port selection matrix W1 can be any type of port selection matrix (including existing port selection matrix types and possible future port selection matrix types, which is not limited in this application), and can be used to indicate the port selection matrix. information. For example, for a dual-polarized antenna, the dimension of W ₁ can be P*2L ₀ , W ₁ is used to select 2L ₀ ports from P CSI-RS ports, and L ₀ means CSI-RS selected in one polarization direction The number of ports (spatial vector), where P means the number of ports of the CSI-RS. The values of L ₀ and P may be configured by the network side through one or more of RCC, MAC CE, and DCI signaling, or may be agreed by the protocol. In addition, if ports are divided into port groups, W1 can also be interpreted from the perspective _of port groups to realize the selection of corresponding ports. For example, for a dual _- polarized antenna, the dimension of W1 can be expressed as

represents the number of CSI-RS port groups in one polarization direction,

Indicates the number of CSI-RS port groups selected for one polarization direction. Assumption

If interpreted from the perspective of ports, each column of elements in W ₁ represents a port group, and an element with a value of 1 indicates that the corresponding CSI-RS port is selected. According to this W ₁ indicates that among the two CSI-RS port groups, select the first The first CSI-RS port in one group, and the third CSI-RS port in the second group. If interpreted from the perspective of port groups, each row of elements in W ₁ represents a port group, and the element with a value of 1 indicates that the corresponding CSI-RS port group is selected. According to the W ₁ , it indicates that among the four CSI-RS port groups, Select the first CSI-RS port group, and the third CSI-RS port group.

W _f can also be any type of frequency domain component matrix (including existing frequency domain component matrix types and possible future frequency domain component matrix types, which is not limited in this application), and W _f can include one or more A specific column vector (also referred to as a basis vector), for a column vector including a column vector, the length of the column vector can be N _f × 1, where N _f is the number of frequency units, which can be equal to the number of RBs in the CSI-RS transmission bandwidth Or the number of subbands, or it may be a function of the number of RBs or subbands, or it may be notified by the network side or a protocol agreement. For example, the network side can restrict W _f to be a specific K column of the (oversampling) DFT through signaling, where the K column represents K specific frequency component positions.

It can be understood that the above _- mentioned port selection matrix W1 may not be available, and the selected ports may be indicated by the terminal device to the network device in other forms, such as the form of a bitmap, so the first codebook can satisfy

in,

and Q ^H refer to the above explanation, W ₂ can be the same as the above explanation, and is still the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports (case 1), that is, combined with the bitmap indication and W ₂ , we can know which ports are selected from all ports port, and the superposition coefficient corresponding to the selected port; or W ₂ can be the superposition coefficient matrix of the superposition coefficient corresponding to the selected port (case 2), that is, combined with the bitmap indication and W ₂ , it can be known that all ports have selected which ports, and the superposition factor corresponding to the selected port.

It should be noted that, for case 1, W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and it only illustrates the structure size of W ₂ (or the number of matrix elements in W ₂ ) considering each port (also That is to say, the number of ports of all ports is considered), for example, the number of lines of W ₂ is the number of ports of all ports. But this does not mean that the information content of W ₂ (the content indicated by the matrix elements in W ₂ ) includes the superposition coefficient corresponding to each port in all ports. For example, if some ports are not selected, the corresponding ones in W ₂ The value on the matrix element may be 0, and only the selected port has its corresponding superposition coefficient _on the corresponding matrix element in W2. Similarly, for the second case, W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports, but it just shows that the structure size of W ₂ (or the number of matrix elements in W ₂ ) is taken into consideration of the selected ports (also That is to say, the port number of the selected port is considered), for example, the number of lines of W ₂ is the port number of the selected port. It can be seen that the size of the matrix may be smaller in case 2 than in case 1.

340. The terminal device sends third indication information.

Step 340 is an optional step, and the corresponding network device receives third indication information, where the third indication information is used to indicate the port selection matrix W ₁ . The indication to the port selection matrix W1 may be _a direct indication or an indirect indication. Optionally, the third indication information and the first indication information may be sent through one message or separately sent through different messages.

Through the embodiments of the present application, the channel measurement can be performed using the specific time delay for each UE, which can reduce the influence of the time delay deviation caused by the uplink and downlink timing errors, reduce the interference between multi-user CSI-RS, and improve the CSI-RS multiplexing. rate and reduce CSI-RS overhead.

FIG. 4 is a schematic interaction diagram of a method 400 for channel measurement provided by another embodiment of the present application. The difference between this embodiment and the embodiment shown in FIG. 3 is that the method for obtaining the first delay in this embodiment is indicated by the network device to the terminal device, and the method 400 may include the following steps.

410. The terminal device receives a precoding reference signal.

410 is similar to the above-mentioned 310, and reference is made to the description of 310, and details are not repeated here.

420. The terminal device receives the second indication information.

Correspondingly, the network device generates the second indication information, and sends the second indication information, where the second indication information is used to indicate the second delay specific to the terminal device. In this embodiment, the second delay is the first delay.

Optionally, the second indication information may directly carry the second delay, or may carry parameters associated with the second delay, or be a variant of the second delay, etc. In a word, the The second indication information can directly or indirectly indicate the second delay. It can be understood that the second indication information may be issued through one or more pieces of signaling, which is not limited in this application. It should be understood that 410 and 420 are not necessarily in order.

430. The terminal device determines the specific first delay of the terminal device according to the second indication information, and performs channel measurement based on the precoding reference signal and the final first delay, and obtains the corresponding port corresponding to each port. the superposition factor.

The direct or indirect indication means for the second indication information may specifically be:

Means (1): the second indication information directly indicates the second delay (denoted as τ ^* )

It should be noted that τ ^* here is the quantized delay information. The network device estimates the angular delay information (θ _i , τ _i ) for the i-th path (or the i-th port) from the uplink channel estimation, where θ _i is the angle information, and τ _i is the delay information. Load the angle and pre-bias post-delay (θ _i ,τ _i -τ ^* ) onto the pilot, and use the pilot to estimate the equivalent channel, assuming that the number of subbands is K (that is, the number of subbands used to transmit CSI-RS number of bands), the number of transmitting antennas on the network device side is M (the UE may not need to perceive the M), the number of receiving antennas on the UE side is N, the number of ports is P, the K, M, N, and P are all integers, and K and P can be indicated to the UE by the network device, and the equivalent channel on the nth (1≤n≤N) UE antenna can be expressed as:

in,

represents the field of complex numbers with P rows and K columns,

Represents the downlink channel on the kth subband on the nth receiving antenna of the UE, where dl represents the downlink, n=1, 2,...,N,

Indicates the precoding weight vector on the pth port and the kth subband of the network device. Among them, k=1,2,...,K;

Represents a complex number field with M rows and 1 column;

Elements

Represents the equivalent channel estimated by the UE on the nth receiving antenna, the pth (p=1, 2, ..., P) port and the kth subband, where eq represents equivalent.

The UE performs channel estimation based on a specific delay τ ^* to obtain an equivalent channel, denoted as

(in

is the equivalent channel obtained without considering τ ^* ):

Q is a diagonal matrix used for channel estimation using τ ^* , which satisfies the following form:

in,

Represents a field of complex numbers with K rows and K columns, and the elements on the diagonal of this diagonal matrix are

f _k represents the frequency of the k-th subband, k=1, 2, ..., K, where K is the number of subbands.

The UE calculates the PL superposition coefficients corresponding to the nth receiving antenna of the UE as follows (PL represents P multiplied by L, and the PL superposition coefficients are the sum of the superposition coefficients corresponding to each of the P ports, where the superposition corresponding to each port is The coefficients can be L):

in,

Represents a complex number domain with PL row and 1 column, vec(A) means to expand the matrix A into a column vector, L is the number of columns of the frequency domain component matrix W _f , W _f can be indicated to the UE by the network device, or by the protocol Predefined. The cn is the superposition coefficient corresponding to each port corresponding to the _nth receiving antenna of the UE.

Thus, the superposition coefficient cn corresponding to each port for the _nth receiving antenna of the UE is obtained.

Means (2): the second indication information indirectly indicates the second delay by indicating other information

It is assumed that the number of subbands is K, the number of transmitting antennas of the network device is M, the number of receiving antennas at the UE side is N, and the number of ports is P. The network device sends signaling to instruct the UE to feed back the path coefficients (optionally, it can indicate (oversampling) the value of the DFT codebook) on the specific frequency domain component w _q (related to the τ ^* , which is equivalent to the indirect indication τ ^* ). The index (index) is equivalent to indicating the related information of 0 and o. Optionally, 0 and o can be indicated to the UE together, or can be indicated to the UE through different messages, and the ratio of o/0 can also be indicated; where 0 is the number of columns of the (oversampling) DFT codebook, o=0,1,...,O-1), it can be understood that O is associated with τ ^* ;

in,

Represents a complex number field with K rows and 1 column, o=0,1,...,O-1, O is the number of columns of the (oversampling) DFT codebook, and the column vector elements of w _q are

K is the number of subbands; the network device can deliver the relevant information of o and 0 to the UE.

The network equipment obtains the angle delay information (θ _i ,τ _i ) from the uplink channel estimation and loads it on the pilot frequency, and performs

pre-offset, where

is the conjugate of w _q .

The UE uses the pilot to estimate the equivalent channel, and the equivalent channel on the nth (n=1, 2, ..., N) antenna of the UE can be expressed as:

in,

represents the field of complex numbers with P rows and K columns,

Represents the downlink channel on the kth subband on the nth receiving antenna of the UE, where dl represents the downlink,

Represents a complex number field with M rows and 1 column;

Elements

Indicates the equivalent channel estimated by the UE on the nth receiving antenna, the pth (p=1, 2, ..., P) port and the kth subband, where eq represents equivalent.

After the UE performs channel estimation based on w _q , the equivalent channel is obtained, which is denoted as

(in

is the equivalent channel obtained without considering w _q ):

is a diagonal matrix used for channel estimation using w _q , which satisfies the following form and is determined by the relevant information of o and o indicated by the network device:

Among them, w _q (k) represents the k-th element of w _q , and the elements on the diagonal of this diagonal matrix are

K is the number of subbands, o=0,1,...,O-1.

in,

440. The terminal device sends the first indication information.

Correspondingly, the network device receives the first indication information, where the first indication information is used to indicate the superposition coefficients corresponding to the respective ports. 440 is similar to 330. For the same content, reference may be made to the description of 330, and details are not repeated here.

For one receiving antenna, the UE can report the feedback coefficients according to the instructions of the network device or select some coefficients from P×L coefficients for reporting. The following is a simple description. It is assumed that the UE selects P' coefficients from the PL coefficients for feedback, where P' is greater than or equal to 1 and less than or equal to PL, that is to say, all or part of the superposition coefficients corresponding to each port can be fed back, which is hereby explained. .

Feedback methods for all receiving antennas of the UE:

If for all the receiving antennas of the UE, there are _N cn to be fed back. It is assumed that for each receiving antenna, the same number of P' coefficients are selected from the PL coefficients for feedback (of course, it can also be selected for different receiving antennas. different numbers of coefficients for feedback), feedback the coefficients corresponding to all receiving antennas

A complex number field representing N rows and P' columns. Among them, c _n is the superposition coefficient corresponding to each port corresponding to the nth (n=1, 2, ..., N) UE antenna, and [c ₁ ... c _N ] ^T represents [c ₁ ... c _N ] transpose.

Feedback for Rank:

Perform singular value decomposition (SVD) decomposition on the coefficients C=[c ₁ ... c _N ] ^T on all receiving antennas, and feed back the equivalent coefficients of all Ranks corresponding to the rank indicator (RI), A total of RP' equivalent coefficients, where R is the Rank number, and R is less than or equal to N.

It can be understood that there is no limitation on which feedback manner the UE adopts, and may be the feedback manner in the prior art.

Similar to the embodiment in FIG. 3 , the superposition coefficients corresponding to the respective ports are used to determine the first codebook, and the first codebook satisfies:

or,

For a specific description, refer to the embodiment in FIG. 3 , which will not be repeated here.

It should be understood that the above formula satisfied by the first codebook is from the perspective of one receiving antenna, considering the collection of superposition coefficients corresponding to each port in all ports corresponding to one receiving antenna, there is one W ₂ ; _The root receive antenna, W2 has N or can be an equivalent variant of N _W2 .

Exemplary, optional, wherein for a dual-polarized antenna, the dimension of W ₁ may be P*2L ₀ , W ₁ is used to select 2L ₀ ports from the P CSI-RS ports, and L ₀ means a polar is the number of CSI-RS ports (spatial vector) selected in the direction of LD, and the meaning of P is the number of CSI-RS ports. W ₂ is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W ₂ may be the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports, and W _f is the frequency component matrix (also referred to as the frequency domain basis vector matrix ), W _f can include one or more specific column vectors (also called basis vectors), the network side can restrict W _f to be a specific K column of DFT or oversampling DFT through signaling, and K column represents K specific frequency component location.

For means (1) in 430, Q is a diagonal matrix of the following form (see above for a detailed explanation, and will not be repeated here):

For means (2) in 430, Q is a diagonal matrix of the following form (see above for a detailed explanation, and will not be repeated here):

450. The terminal device sends third indication information.

Step 450 is an optional step, and the corresponding network device receives the third indication information, where the third indication information is used to indicate the port selection matrix W ₁ . The indication to the port selection matrix W1 may be _a direct indication or an indirect indication. Optionally, the third indication information and the first indication information may be sent through one message or separately sent through different messages.

Through the embodiments of the present application, it is possible to perform channel measurement by using the specific time delay for each UE based on the indication of the network device, which can reduce the influence of the time delay deviation caused by the uplink and downlink timing errors, and also reduce the interference between multi-user CSI-RS. Improve CSI-RS multiplexing rate and reduce CSI-RS overhead.

FIG. 5 is a schematic interaction diagram of a method 500 for channel measurement provided by another embodiment of the present application. The difference between this embodiment and the embodiment shown in FIG. 4 is that the method for obtaining the first delay in this embodiment is obtained by the UE performing delay estimation (the network device may impose a delay offset, or it may not impose a delay offset). time delay offset), the method 500 may include the following steps.

510. The terminal device receives a precoding reference signal.

510 is similar to the above-mentioned 310 and 410. Refer to the description of 310 and 410, and details are not repeated here.

520. The terminal device receives the second indication information.

520 is an optional step in this embodiment, and the UE may receive the second indication information for indicating the second delay specific to the terminal device. In this embodiment, the second delay is not the first delay, the second delay is a specific delay offset by the network device for the UE, and the first delay is a requirement finally determined by the UE A specific delay used for channel measurement (ie, channel estimation). Optionally, the second delay may not be specific to the UE. Optionally, the second indication information may directly carry the second delay, or may carry parameters associated with the second delay, or be a variant of the second delay, etc. In a word, the The second indication information can directly or indirectly indicate the second delay. It can be understood that the second indication information may be issued through one or more pieces of signaling, which is not limited in this application. It should be understood that 510 and 520 are not necessarily in order.

530. The terminal device performs channel measurement based on the precoding reference signal and the first time delay specific to the terminal device, and obtains a superposition coefficient corresponding to each of the ports.

Similar to 320 and 430, the same parts are not repeated here; the difference is that, in this embodiment, the first delay is obtained by the UE performing delay estimation, and may include:

Mode 1: The UE estimates the delay within a predetermined delay range corresponding to the second delay according to the indication of the second indication information, and the predetermined delay range may be a certain delay value range agreed in the protocol , the UE may perform delay estimation within a predetermined delay range based on the indication of the network device and take the second delay as a reference to obtain the first delay.

Taking the means (1) in the embodiment of FIG. 4 as an example, the parts with the same content as the means (1) in 430 will not be repeated in this embodiment. After the UE performs channel estimation based on a specific delay τ ^* (that is, the second delay, or called uplink delay), the equivalent channel is obtained, that is, the

in

is the equivalent channel obtained without considering τ ^* ,

is the diagonal matrix used for channel estimation using τ ^* , and is a diagonal matrix of the form:

Due to the uplink and downlink delay timing deviation, the UE cannot obtain the correct delay tap after channel estimation based on the delay τ _* . Therefore, it is necessary to additionally perform channel estimation based on the uplink and downlink timing deviation to obtain the equivalent channel. The uplink and downlink timing deviation can be determined by the UE side. is calculated and denoted as τ _TA , then the equivalent channel after channel estimation based on the uplink and downlink timing offset is denoted as

Q _TA is a diagonal matrix used for channel estimation using τ _TA , which satisfies the following form

Optionally, the above two steps can be combined into one step, that is, channel estimation is performed based on τ ^* and τ _TA at the same time, that is,

(τ ^* +τ _TA ) is the first time delay specific to the terminal device.

The UE calculates the P×L coefficients corresponding to the nth UE antenna as follows:

Taking the means (2) in the embodiment of FIG. 4 as an example, the parts with the same content as the means (2) in 430 will not be repeated in this embodiment. For w _q related to the τ ^* , the diagonal matrix for channel estimation using w _q satisfies the following form, which is determined by the relevant information of o and o indicated by the network device:

For the τ _TA , the (oversampled) DFT frequency domain vector is w′ _q , and the related information of the index (index) of the corresponding (oversampled) DFT codebook is O′ and o′. The diagonal matrix for channel estimation using w' _q satisfies the following form, where O' and o' are determined by the UE:

Mode 2: The network device does not send the second indication information, or even if the network device does not perform delay offset, the UE performs delay adjustment amount estimation to obtain the first delay (which is also equivalent to obtaining the corresponding Sampling) DFT frequency domain vector), optionally, the UE can perform delay adjustment amount estimation in conjunction with each port (it can be said to combine all ports) or in conjunction with some ports. Different from mode 1, UE does not obtain τ ^* and τ _TA respectively in mode 2, so mode 2 is equivalent to performing channel estimation directly based on (τ ^* +τ _TA ), or it can be said that UE directly performs channel estimation based on a specific τ′ It is estimated that τ' is the first time delay specific to the terminal device, and τ' is equivalent to (τ ^* +τ _TA ). Alternatively, the UE does not obtain w _q and w' _q respectively in the second way, so the second way is equivalent to directly performing channel estimation based on w _q and w' _q , or it can be said that the UE directly based on the specific

perform channel estimation,

Equivalent to w _q and w′ _q ,

The related information of the index of the corresponding (oversampled) DFT codebook is o ^* and O ^* , which are determined by the UE.

540. The terminal device sends the first indication information.

540 is similar to 440. For the same content, reference may be made to the description of 440, which will not be repeated here. The difference is that in this embodiment, the codebook structure

Q in is a diagonal matrix of the following form for means (1) in way one:

Among them, the elements on the diagonal are

f _k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ ^* +τ _TA ) is the first delay, and τ ^* is the uplink delay , τ _TA is the uplink and downlink timing deviation.

For the second way, Q can be equivalently deformed as:

Among them, the elements on the diagonal are

f _k represents the frequency of the k-th subband, k=1, 2, . . . , K, and K is the number of subbands.

For the means (2) in the first way, Q is a diagonal matrix of the following form:

Among them, the diagonal elements of the diagonal matrix are

K is the number of subbands, where o=0,1,...,O-1, o'=0,1,...,O'-1, O is the first (oversampling) DFT codebook The number of columns of , O' is the number of columns of the second (oversampled) DFT codebook, and O and O' are associated with the first delay. It can be understood that the first (oversampling) DFT codebook may be determined by the network device, and the second (oversampling) DFT codebook may be determined by the terminal device, that is, O is determined by the network device, and O' is determined by the UE Sure.

For the second way, Q can be equivalently deformed as:

Among them, the diagonal elements of the diagonal matrix are

K is the number of subbands, where o ^* =0,1,...,O ^* -1.

550. The terminal device sends third indication information.

Step 550 is an optional step, and the corresponding network device receives third indication information, where the third indication information is used to indicate the port selection matrix W ₁ . The indication to the port selection matrix W1 may be _a direct indication or an indirect indication.

560. The terminal device sends fourth indication information.

Step 560 is an optional step, and the corresponding network device receives fourth indication information, where the fourth indication information is used to indicate the first delay. Optionally, the fourth indication information may directly indicate or indirectly indicate the first delay. For example, the fourth indication information includes information of the first delay (eg, τ ^* +τ _TA , τ '), or the fourth indication information includes a delay adjustment amount (eg, τ _TA ) for obtaining the first delay, or includes other information (eg o/O, o'/O', etc.) to to instruct.

Optionally, the third indication information, the fourth indication information and the first indication information may be sent through one message or sent through different messages respectively.

Through the embodiments of the present application, for possible uplink and downlink timing deviations, the UE performs delay estimation to determine the channel measurement for the specific delay of the UE, which can reduce the influence of the uplink and downlink timing errors caused by the delay deviation, and at the same time reduce the Interference between multi-user CSI-RS, improve CSI-RS multiplexing rate and reduce CSI-RS overhead.

It should be noted that, in the above embodiments of FIG. 3 to FIG. 5 , the first indication information, the third indication information, and the fourth indication information can be sent through the same signaling or through different signaling, and this application does not carry out this. limit.

For the above embodiments of FIG. 3 to FIG. 5 , the inter-user interference can be reduced when multiple users perform CSI-RS multiplexing in the delay domain, and two users are taken as an example below. For simplicity of description, the angle domain information is ignored in this example, and it is assumed that both the network device and the UE are configured with one antenna, there are K subbands in the frequency domain, each user has only one path, and the precoding reference signal corresponds to only one port. , the user's channel looks like this:

where α ₁ and α ₂ are the superposition coefficients corresponding to users 1 and 2 respectively (that is, the superposition coefficient corresponding to the one port may also be called a complex path coefficient), and τ ₁ and τ ₂ are the paths of users 1 and 2 respectively. Time delay (assuming τ ₁ ≠τ ₂ ), UE1 and UE2 multiplex the same CSI-RS port.

When the network side uniformly offsets UE 1 and UE 2 to a certain delay component (for example, delay point 0), the network side delivers the CSI-RS weight precoding as w=(w ₁ +w ₂ ) ^* , w ₁ and w ₂ are the frequency domain phase change vectors corresponding to the path delays of users 1 and 2 respectively, (w ₁ +w ₂ ) ^* is the conjugate of (w ₁ +w ₂ ), and the UE side estimates the path complex coefficients as follows:

can get

and

The signal-to-interference ratio of , respectively, is,

When the network device offsets UE1 to the UE1-specific first delay (assuming that the delay is 0 point), and the network device offsets UE2 to the UE2-specific first delay (assuming that it is τ ^* ), the network side The precoding of the delivered CSI-RS weights is w=(w ₁ +Qw ₂ ) ^* , where Q is a diagonal matrix:

The estimated path coefficient on the UE side is

can get

and

The signal-to-interference ratio of

K is the number of subbands described by _γ1 and

← ₂ with

It can be seen from the comparison that the matrix Q can be designed such that

That is, the signal-to-interference ratio of the estimated path complex coefficients is improved, especially when w ₁ and w ₂ are not orthogonal, Q can be selected so that Q ^H w ₁ and w ₂ are orthogonal. At this time, the CSI-RS is multiplexed, and there is no interference.

The methods provided by the embodiments of the present application are described in detail above. Hereinafter, the communication apparatus provided by the embodiments of the present application will be described in detail with reference to FIG. 6 to FIG. 8 .

FIG. 6 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1000 may include a communication unit 1100 and a processing unit 1200 .

In a possible design, the communication apparatus 1000 may correspond to the terminal equipment in the above apparatus embodiments, for example, may be a terminal equipment, or a chip configured in the terminal equipment.

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 300 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method performed by the terminal device in the method 300 in FIG. 3 . Moreover, each unit in the communication apparatus 1000 and the above-mentioned other operations and/or functions are respectively for realizing the corresponding flow of the method 300 in FIG. 3 .

Wherein, when the communication device 1000 is used to execute the method 300 in FIG. 3 , the communication unit 1100 can be used to execute the step 310 in the method 300 involving terminal reception, and to execute the steps 330 and 340 involve the terminal sending, the processing unit 1200 may be used to perform step 320 in method 300 .

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 400 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method performed by the terminal device in the method 400 in FIG. 4 . Moreover, each unit in the communication device 1000 and the other operations and/or functions mentioned above are respectively for realizing the corresponding flow of the method 400 in FIG. 4 .

Wherein, when the communication device 1000 is used to execute the method 400 in FIG. 4 , the communication unit 1100 can be used to execute the steps 410 and 420 of the method 400 involving terminal reception, and the processing unit 1200 to execute the steps 440 and 450 involve the terminal transmission. may be used to perform step 430 in method 400 .

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 500 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method performed by the terminal device in the method 500 in FIG. 5 . Moreover, each unit in the communication device 1000 and the other operations and/or functions mentioned above are respectively for realizing the corresponding flow of the method 500 in FIG. 5 .

Wherein, when the communication device 1000 is used to execute the method 500 in FIG. 5 , the communication unit 1100 can be used to execute the steps 510 and 520 in the method 500 involving terminal reception, and the processing unit 1200 to execute the steps 540, 550 and 560 involve the terminal sending. may be used to perform step 530 in method 500 .

It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned apparatus embodiments, and for the sake of brevity, it will not be repeated here.

It should also be understood that when the communication device 1000 is a terminal device, the communication unit 1100 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 7 , and the processing unit 1200 in the communication device 1000 may Corresponds to the processor 2010 in the terminal device 2000 shown in FIG. 7 .

It should also be understood that when the communication apparatus 1000 is a chip or a chip system configured in a terminal device, the communication unit 1100 in the communication apparatus 1000 may be an input/output interface, an interface circuit, an output/input circuit, a pin or a related circuit etc., the processing unit 1200 may be a processor, a processing circuit or a logic circuit.

Specifically, the communication apparatus 1000 may correspond to the network device in the method 300 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method performed by the network device in the method 300 of FIG. 3 . Moreover, each unit in the communication apparatus 1000 and the above-mentioned other operations and/or functions are respectively for realizing the corresponding flow of the method 300 in FIG. 3 .

Wherein, when the communication device 1000 is used to execute the method 300 in FIG. 3 , the communication unit 1100 can be used to execute the step 310 of the method 300 involving sending by the network device, and be used to execute the steps 330 and 340 involving the receiving of the network device. Unit 1200 may be configured to perform the steps of method 300 for generating a precoding reference signal.

Specifically, the communication apparatus 1000 may correspond to the network device in the method 400 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the apparatus executed by the network device in the method 400 of FIG. 4 . Moreover, each unit in the communication device 1000 and the other operations and/or functions mentioned above are respectively for realizing the corresponding flow of the method 400 in FIG. 4 .

Wherein, when the communication apparatus 1000 is used to execute the method 400 in FIG. 4 , the communication unit 1100 can be used to execute the steps 410 and 420 of the method 400 involving sending by the network device, and to execute the steps 440 and 450 involving the receiving of the network device, and the processing The unit 1200 may be configured to perform the steps of generating the precoding reference signal and the second indication information in the method 400 .

Specifically, the communication apparatus 1000 may correspond to the network device in the method 500 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the apparatus executed by the network device in the method 500 of FIG. 5 . Moreover, each unit in the communication device 1000 and the other operations and/or functions mentioned above are respectively for realizing the corresponding flow of the method 500 in FIG. 5 .

Wherein, when the communication apparatus 1000 is used to execute the method 500 in FIG. 5 , the communication unit 1100 can be used to execute the steps 510 and 520 of the method 500 involving sending by the network device, and be used to execute the steps 540, 550 and 560 involving the receiving of the network device. The unit 1200 may be configured to perform the step of generating the precoding reference signal and/or the second indication information in the method 500 .

It should also be understood that when the communication apparatus 1000 is a network device, the communication unit in the communication apparatus 1000 may correspond to the transceiver 3200 in the network apparatus 3000 shown in FIG. 8 , and the processing unit 1200 in the communication apparatus 1000 may Corresponds to the processor 3100 in the network device 3000 shown in FIG. 8 .

It should also be understood that when the communication apparatus 1000 is a chip or a chip system configured in a network device, the communication unit 1100 in the communication apparatus 1000 may be an input/output interface, an interface circuit, an output/input circuit, a pin or a related circuit etc., the processing unit 1200 may be a processor, a processing circuit or a logic circuit.

FIG. 7 is a schematic structural diagram of a terminal device 2000 provided by an embodiment of the present application. The terminal device 2000 can be applied to the systems shown in FIGS. 1 a and 1 b to perform the functions of the terminal device in the foregoing method embodiments.

As shown in the figure, the terminal device 2000 includes a processor 2010 and a transceiver 2020 . Optionally, the terminal device 2000 further includes a memory 2030 . The processor 2010, the transceiver 2020 and the memory 2030 can communicate with each other through an internal connection path to transmit control and/or data signals. The memory 2030 is used to store computer programs, and the processor 2010 is used to retrieve data from the memory 2030 The computer program is called and executed to control the transceiver 2020 to send and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for sending the uplink data or uplink control signaling output by the transceiver 2020 through wireless signals.

The above-mentioned processor 2010 and the memory 2030 can be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to realize the above-mentioned functions. During specific implementation, the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010 . The processor 2010 may correspond to the processing unit in FIG. 6 .

The foregoing transceiver 2020 may correspond to the communication unit in FIG. 6 , and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that the terminal device 2000 shown in FIG. 7 can implement various processes involving the terminal device in the method embodiments shown in FIG. 3 to FIG. 4 . The operations and/or functions of each module in the terminal device 2000 are respectively to implement the corresponding processes in the foregoing apparatus embodiments. For details, reference may be made to the descriptions in the foregoing apparatus embodiments. To avoid repetition, detailed descriptions are appropriately omitted here.

The above-mentioned processor 2010 may be used to perform the actions described in the foregoing apparatus embodiments that are implemented inside the terminal device, and the transceiver 2020 may be used to perform the operations described in the foregoing apparatus embodiments that the terminal equipment sends to or receives from the network device. action. For details, please refer to the descriptions in the foregoing apparatus embodiments, which will not be repeated here.

Optionally, the above terminal device 2000 may further include a power supply 2050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, etc., the audio circuit Speakers 2082, microphones 2084, etc. may also be included.

FIG. 8 is a schematic structural diagram of a network device provided by an embodiment of the present application. The network device 3000 may be applied to the system shown in FIG. 1a to perform the functions of the network device in the foregoing method embodiments.

In the 5G communication system, the network device 3000 may include CU, DU, and AAU. Compared with the network device in the LTE communication system, the network device is composed of one or more radio frequency units, such as a remote radio unit (RRU) and one or more radio frequency units. For a base band unit (BBU):

The non-real-time part of the original BBU will be divided and redefined as CU, which is responsible for processing non-real-time protocols and services. Part of the physical layer processing function of the BBU is merged with the original RRU and passive antenna into AAU, and the remaining functions of the BBU are redefined as DU. Responsible for handling physical layer protocols and real-time services. In short, CU and DU are distinguished by the real-time nature of processing content, and AAU is a combination of RRU and antenna.

CU, DU, and AAU can be separated or co-located. Therefore, there will be various network deployment forms. One possible deployment form is shown in Figure 8, which is consistent with traditional 4G network equipment. CU and DU share hardware deployment. It should be understood that FIG. 8 is only an example, and the protection scope of the present application is not limited. For example, the deployment form may also be that DUs are deployed in the BBU equipment room, CUs are deployed in a centralized manner, or DUs are centrally deployed, and CUs are centralized at higher levels.

The AAU 3100 can implement a transceiving function and is called a transceiving unit 3100, which corresponds to the communication unit 1100 in FIG. 6 . Optionally, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102 . Optionally, the transceiver unit 3100 may include a receiving unit and a sending unit, the receiving unit may correspond to a receiver (or called a receiver, a receiving circuit), and the sending unit may correspond to a transmitter (or called a transmitter, a sending circuit). The CU and DU 3200 can implement an internal processing function called a processing unit 3200, which corresponds to the processing unit 1200 in FIG. 6 . Optionally, the processing unit 3200 may control network devices, etc., and may be referred to as a controller. The AAU, the CU and the DU may be physically set together, or may be physically separated.

In addition, the network device is not limited to the form shown in FIG. 8, and can also be in other forms: for example: including BBU and adaptive radio unit (adaptive radio unit, ARU), or including BBU and active antenna unit (active antenna unit, AAU) ); may also be customer terminal equipment (customer premises equipment, CPE), or may be other forms, which are not limited in this application.

In an example, the processing unit 3200 may be composed of one or more boards, and the multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may support different access standards respectively. wireless access network (such as LTE network, 5G network or other networks). The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is configured to control the network device to perform necessary actions, for example, configured to control the network device to execute the operation flow of the network device in the foregoing method embodiments. The memory 3201 and processor 3202 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.

It should be understood that the network device 3000 shown in FIG. 8 can implement the network device functions involved in the method embodiments of FIGS. 3-5 . The operations and/or functions of each unit in the network device 3000 are respectively to implement the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, the detailed description is appropriately omitted here. The structure of the network device illustrated in FIG. 8 is only a possible form, and should not constitute any limitation to the embodiments of the present application. This application does not exclude the possibility of other forms of network device structures that may appear in the future.

The above-mentioned CU and DU 3200 can be used to perform the actions implemented by the network device described in the previous method embodiments, and the AAU 3100 can be used to perform the network device described in the previous method embodiments. Send to or receive from the terminal device. action. For details, please refer to the descriptions in the foregoing method embodiments, which will not be repeated here.

Embodiments of the present application further provide a processing apparatus, including a processor and a communication interface; the processor is configured to execute a computer program, so that the processing apparatus implements the methods in the above method embodiments.

It should be understood that the above processing device may be a chip or a chip system. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or a It is a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips. The communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip or the chip system. The processor may also be embodied as a processing circuit or a logic circuit.

In the implementation process, each step of the above-mentioned apparatus may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The steps of the apparatus disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above device in combination with its hardware. To avoid repetition, detailed description is omitted here.

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the foregoing apparatus embodiment may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processors may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components . Each device, step, and logic block diagram disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the apparatus disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above device in combination with its hardware.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memory of the systems and devices described herein is intended to include, but not be limited to, these and any other suitable types of memory.

According to the device provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute the steps shown in FIGS. 3 to 5 . The method of any one of the illustrated embodiments.

According to the device provided by the embodiment of the present application, the present application further provides a computer-readable medium, where the computer-readable medium stores program codes, and when the program codes are run on a computer, the computer is made to execute the programs shown in FIGS. 3-5 . The method of any one of the illustrated embodiments.

According to the apparatus provided by the embodiment of the present application, the present application further provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can 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 the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The network equipment in the above-mentioned various apparatus embodiments completely corresponds to the terminal equipment and the network equipment or terminal equipment in the apparatus For the sending step, other steps except sending and receiving may be performed by a processing unit (processor). For the functions of specific units, reference may be made to the corresponding device embodiments. The number of processors may be one or more.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware accomplish. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different means for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing device embodiments, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and devices may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

In the above embodiments, the functions of each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it can 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 (programs). When the computer program instructions (programs) are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the apparatus described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific implementations of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method for channel measurement, characterized in that the method comprises:

receiving a precoding reference signal, the precoding reference signal corresponding to one or more ports;

Based on the precoding reference signal and the terminal-specific first delay, channel measurement is performed to obtain a superposition coefficient corresponding to each of the ports;

Send first indication information, where the first indication information is used to indicate the superposition coefficient.
The method according to claim 1, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 1 is the port selection matrix of the port, W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The method according to claim 1, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports in the superposition coefficients corresponding to the respective ports; W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The method according to claim 2 or 3, wherein the Q is:

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,...,K, K is the number of subbands, and τ * is the first delay; or

Where o=0,1,...,O-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the oversampled discrete Fourier transform DFT codebook, and O is associated with the first delay; or

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ * +τ TA ) is the first delay, and τ * is the uplink delay , τ TA is the uplink and downlink timing offset; or

Where o=0,1,...,O-1, o'=0,1,...,O'-1, the elements on the diagonal are
K is the number of subbands, O is the number of columns of the first oversampling DFT codebook, O' is the number of columns of the second oversampling DFT codebook, and O and O' are associated with the first delay.
The method according to any one of claims 1-4, wherein the method further comprises:

Second indication information is received, where the second indication information is used to indicate a second delay specific to the terminal device.
The method of claim 5, wherein:

The second indication information includes the information of the second delay, or

The second indication information includes an index of the oversampled DFT codebook.
The method according to claim 5 or 6, wherein the second delay is the first delay.
The method according to claim 5 or 6, wherein the first delay is a delay determined within a predetermined delay range corresponding to the second delay.
The method according to any one of claims 1-4, wherein the first delay is a delay obtained by estimating a delay adjustment amount.
The method according to claim 8 or 9, wherein the method further comprises:

Send fourth indication information, where the fourth indication information is used to indicate the first delay.
The method of claim 10, wherein:

The fourth indication information includes the information of the first delay, or

The fourth indication information includes information for obtaining a delay adjustment amount of the first delay.
The method according to any one of claims 1-11, wherein the method further comprises:

Send third indication information, where the third indication information is used to indicate the port selection matrix of the port.
A method for channel measurement, characterized in that the method comprises:

generating a precoding reference signal, the precoding reference signal corresponding to one or more ports;

sending the precoding reference signal;

First indication information is received, where the first indication information is used to indicate a superposition coefficient corresponding to each of the ports, where the superposition coefficient is associated with a first delay specific to the terminal device.
The method according to claim 13, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 1 is the port selection matrix of the port, W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The method according to claim 13, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports in the superposition coefficients corresponding to the respective ports; W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The method according to claim 14 or 15, wherein the Q is:

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,...,K, K is the number of subbands, and τ * is the first delay; or

Where o=0,1,...,O-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the oversampled discrete Fourier transform DFT codebook, and O is associated with the first delay; or

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ * +τ TA ) is the first delay, and τ * is the uplink delay , τ TA is the uplink and downlink timing offset; or

Where o=0,1,...,O-1, o'=0,1,...,O'-1, the elements on the diagonal are
K is the number of subbands, O is the number of columns of the first oversampling DFT codebook, O' is the number of columns of the second oversampling DFT codebook, and O and O' are associated with the first delay.
The method according to any one of claims 13-16, wherein the method further comprises:

Send second indication information, where the second indication information is used to indicate a second delay specific to the terminal device.
The method of claim 17, wherein:

The second indication information includes the information of the second delay, or

The second indication information includes an index of the oversampled DFT codebook.
The method according to claim 17 or 18, wherein the second delay is the first delay.
The method according to claim 17 or 18, wherein the first delay is a delay determined within a predetermined delay range corresponding to the second delay.
The method according to any one of claims 13-16, wherein the first delay is a delay obtained by the terminal device estimating the delay adjustment amount.
The method according to claim 20 or 21, wherein the method further comprises:

Fourth indication information is received, where the fourth indication information is used to indicate the first delay.
The method of claim 22, wherein:

The fourth indication information includes the information of the first delay, or

The fourth indication information includes information for obtaining a delay adjustment amount of the first delay.
The method according to any one of claims 13-23, wherein the method further comprises:

Third indication information is received, where the third indication information is used to indicate a port selection matrix of the port.
A device for channel measurement, characterized in that the device comprises:

a communication unit, configured to receive a precoding reference signal, where the precoding reference signal corresponds to one or more ports;

a processing unit, configured to perform channel measurement based on the precoding reference signal and the first time delay specific to the terminal device, and obtain a superposition coefficient corresponding to each of the ports;

The communication unit is further configured to send first indication information, where the first indication information is used to indicate the superposition coefficient.
The apparatus according to claim 25, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 1 is the port selection matrix of the port, W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The apparatus according to claim 25, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports in the superposition coefficients corresponding to the respective ports; W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The device according to claim 26 or 27, wherein the Q is:

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1,2,...,K, K is the number of subbands, and τ * is the first delay; or

Where o=0,1,...,O-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the oversampled discrete Fourier transform DFT codebook, and O is associated with the first delay; or

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ * +τ TA ) is the first delay, and τ * is the uplink delay , τ TA is the uplink and downlink timing offset; or

Where o=0,1,...,O-1, o'=0,1,...,O'-1, the elements on the diagonal are
K is the number of subbands, O is the number of columns of the first oversampling DFT codebook, O' is the number of columns of the second oversampling DFT codebook, and O and O' are associated with the first delay.
The device according to any one of claims 25-28, wherein the communication unit is further configured to:

Second indication information is received, where the second indication information is used to indicate a second delay specific to the terminal device.
The apparatus of claim 29, wherein:

The second indication information includes the information of the second delay, or

The second indication information includes an index of the oversampled DFT codebook.
The apparatus according to claim 29 or 30, wherein the second delay is the first delay.
The apparatus according to claim 29 or 30, wherein the first delay is a delay determined within a predetermined delay range corresponding to the second delay.
The apparatus according to any one of claims 25-28, wherein the first delay is a delay obtained by estimating a delay adjustment amount.
The device according to claim 32 or 33, wherein the communication unit is further configured to:

Send fourth indication information, where the fourth indication information is used to indicate the first delay.
The apparatus of claim 34, wherein:

The fourth indication information includes the information of the first delay, or

The fourth indication information includes information for obtaining a delay adjustment amount of the first delay.
The device according to any one of claims 25-35, wherein the communication unit is further configured to:

Send third indication information, where the third indication information is used to indicate the port selection matrix of the port.
The apparatus according to any one of claims 25-36, wherein the apparatus is a terminal device, the communication unit is a transceiver, and the processing unit is a processor.
A device for channel measurement, characterized in that the device comprises:

a processing unit, configured to generate a precoding reference signal, where the precoding reference signal corresponds to one or more ports;

a communication unit, configured to send the precoding reference signal;

The communication unit is further configured to receive first indication information, where the first indication information is used to indicate a superposition coefficient corresponding to each of the ports, and the superposition coefficient is associated with a first delay specific to the terminal device.
The apparatus according to claim 38, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 1 is the port selection matrix of the port, W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, and W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The apparatus according to claim 38, wherein the superposition coefficient corresponding to each port is used to determine a first codebook, and the first codebook satisfies
Wherein W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the respective ports, or W 2 is the superposition coefficient matrix of the superposition coefficients corresponding to the selected ports in the superposition coefficients corresponding to the respective ports; W f is the frequency component matrix,
represents the conjugate transpose of W f , Q is the diagonal matrix of the first delay correlation, and Q H represents the conjugate transpose of Q.
The device according to claim 39 or 40, wherein the Q is:

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,...,K, K is the number of subbands, and τ * is the first delay; or

Where o=0,1,...,O-1, the elements on the diagonal are

K is the number of subbands, O is the number of columns of the oversampled discrete Fourier transform DFT codebook, and O is associated with the first delay; or

The elements on the diagonal are
f k represents the frequency of the kth subband, k=1, 2,..., K, K is the number of subbands, (τ * +τ TA ) is the first delay, and τ * is the uplink delay , τ TA is the uplink and downlink timing offset; or

Where o=0,1,...,O-1, o'=0,1,...,O'-1, the elements on the diagonal are
K is the number of subbands, O is the number of columns of the first oversampling DFT codebook, O' is the number of columns of the second oversampling DFT codebook, and O and O' are associated with the first delay.
The device according to any one of claims 38-41, wherein the communication unit is further configured to:

Send second indication information, where the second indication information is used to indicate a second delay specific to the terminal device.
The apparatus of claim 42, wherein

The second indication information includes the information of the second delay, or

The second indication information includes an index of the oversampled DFT codebook.
The apparatus according to claim 42 or 43, wherein the second delay is the first delay.
The apparatus according to claim 42 or 43, wherein the first delay is a delay determined within a predetermined delay range corresponding to the second delay.
The apparatus according to any one of claims 38-41, wherein the first delay is a delay obtained by the terminal equipment estimating the delay adjustment amount.
The apparatus according to claim 45 or 46, wherein the communication unit is further configured to:

Fourth indication information is received, where the fourth indication information is used to indicate the first delay.
The apparatus of claim 47, wherein:

The fourth indication information includes the information of the first delay, or

The fourth indication information includes information for obtaining a delay adjustment amount of the first delay.
The device according to any one of claims 38-48, wherein the communication unit is further configured to:

Third indication information is received, where the third indication information is used to indicate a port selection matrix of the port.
The apparatus according to any one of claims 38-49, wherein the apparatus is a network device, the communication unit is a transceiver, and the processing unit is a processor.
A processing device, characterized in that it comprises at least one processor and a communication interface;

the communication interface is used to input and/or output information;

The processor is adapted to execute a computer program such that the method of any of claims 1-24 is implemented.
The processing device according to claim 51, wherein the processing device further comprises a memory for storing the computer program.
The processing device according to claim 51 or 52, wherein the processing device is a chip or a chip system.
A computer-readable storage medium, characterized by comprising a computer program, which, when the computer program runs on a computer, enables the method according to any one of claims 1-24 to be implemented.
A computer program product, characterized in that it comprises a computer program which, when run on a computer, causes the method according to any one of claims 1-24 to be implemented.