WO2021203373A1

WO2021203373A1 - Channel measurement method and communication apparatus

Info

Publication number: WO2021203373A1
Application number: PCT/CN2020/084017
Authority: WO
Inventors: 秦启波; 范利; 种稚萌; 葛士斌; 汪洁; 毕晓艳
Original assignee: 华为技术有限公司
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2021-10-14
Also published as: CN115315906A; CN115315906B

Abstract

The present application provides a channel measurement method and a communication apparatus, capable of reducing pilot overhead. The method comprises: a terminal device generates first indication information based on a received precoded reference signal, the first indication information indicating K weighting coefficients corresponding to K angular delay pairs, wherein precoding of the precoded reference signal is determined by the K angular delay pairs, and the K angular delay pairs and the corresponding K weighting coefficients thereof are used for constructing a precoding matrix, and each of the K weighting coefficients is determined based on precoded reference signals carried on some of N frequency-domain units, rather than based on precoded reference signals carried on all frequency-domain units, so that precoded reference signals corresponding to more angular delay pairs are carried on the same time-frequency resource; the terminal device sends the first indication information to a network device, so that the network device determines a precoding matrix corresponding to each frequency-domain unit, wherein K and N are integers greater than 1.

Description

Channel measurement method and communication device

Technical field

This application relates to the field of wireless communication, and more specifically, to a channel measurement method and communication device.

Background technique

In the massive multiple-input multiple-output (Massive MIMO) technology, network equipment can reduce the interference between multiple users and the interference between multiple signal streams of the same user through precoding. Conducive to improving signal quality, realizing space division multiplexing, and improving spectrum utilization.

The terminal device may determine the precoding matrix based on downlink channel measurement, and hopes to make the network device obtain the same or similar precoding matrix as the precoding matrix determined by the terminal device through feedback. Specifically, the terminal device may, for example, instruct to construct the precoding matrix by feeding back one or more spatial vectors, one or more frequency domain vectors, and one or more weighting coefficients. However, this feedback method brings a large feedback overhead.

In some communication technologies, such as frequency division duplexing (FDD) technology, there is partial reciprocity between uplink and downlink channels. The network equipment can use the estimation of the uplink channel to obtain the reciprocity information of the downlink channel, such as delay and angle. The network device can pre-code the downlink reference signal based on the delay and angle before sending it, so as to reduce the feedback overhead of the terminal device. However, since the network equipment separately performs the precoding and transmission of the downlink reference signal for each terminal device, the pilot overhead will increase with the increase in the number of terminal devices.

Summary of the invention

This application provides a channel measurement method and communication device in order to reduce pilot overhead.

In the first aspect, a channel measurement method is provided, which may be executed by a terminal device, or may also be executed by a component (such as a circuit, a chip, or a chip system, etc.) configured in the terminal device. This application does not limit this.

Specifically, the method includes: generating first indication information, the first indication information being determined based on the received precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and the K angle time delay Each angle delay pair in the delay pair includes an angle vector and a delay vector; the first indication information is used to indicate K weighting coefficients corresponding to the K angle delay pairs, and the K angle delay pairs And the corresponding K weighting coefficients are used to construct a precoding matrix; each of the K weighting coefficients is determined based on the precoding reference signal carried on part of the N frequency domain units; wherein, N is the number of frequency domain units included in the transmission bandwidth of the reference signal, K and N are both integers greater than 1, and the first indication information is sent.

In the second aspect, a channel measurement method is provided. The method may be executed by a network device, or may also be executed by a component (such as a circuit, a chip, or a chip system, etc.) configured in the network device. This application does not limit this.

Specifically, the method includes: receiving first indication information, the first indication information being determined based on a precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and the K angle delay pairs are centered Each angle delay pair includes an angle vector and a delay vector; the first indication information is used to indicate the K weighting coefficients corresponding to the K angle delay pairs, the K angle delay pairs and their corresponding The K weighting coefficients are used to construct the precoding matrix; each weighting coefficient of the K weighting coefficients is determined based on the precoding reference signal carried on part of the N frequency domain units; where N is the reference The number of frequency domain units included in the transmission bandwidth of the signal, K and N are both integers greater than 1, and the precoding matrix corresponding to each frequency domain unit is determined based on the first indication information.

Based on the above technical solution, the network device can load K angle delay pairs onto some of the N frequency domain units, so that the number of frequency domain units loaded into one angle delay pair can be reduced. If each angle delay pair is loaded on N frequency domain units, N frequency domain units are needed to carry the precoding reference signal corresponding to one angle delay pair; but if each angle delay pair is loaded on On some of the N frequency domain units, the N frequency domain units originally used to carry one angle delay pair can be used to carry precoding reference signals corresponding to more angle delay pairs. Therefore, when the number of angle delay pairs K is constant, the pilot overhead can be reduced, thereby facilitating full utilization of effective spectrum resources. The terminal device can also determine the weighting coefficient corresponding to the angle delay pair according to the channel estimation value on the frequency domain unit loaded with the same angle delay pair, which also reduces the calculation amount of the terminal device to a certain extent.

With reference to the first aspect or the second aspect, in some possible implementation manners, each weighting coefficient of the K weighting coefficients is precoded by received on at least one of the N frequency domain units. The reference signal determines that the at least one frequency domain unit is part of the N frequency domain units, and any two frequency domain units in the at least one frequency domain unit are separated by at least Q/D-1 frequency. Domain unit; Q is an integer greater than 1, Q<K; D is the pilot density, 0<D≤1; Q/D is an integer.

That is to say, the precoding reference signal corresponding to each angle delay pair can be evenly distributed in the frequency domain at intervals of Q/D-1 frequency domain units, which is like loading each angle delay pair evenly on N frequency domain units. Therefore, the terminal device can obtain the channel state information of each frequency domain position, which is beneficial to obtain more accurate measurement results.

Moreover, when the number of terminal devices increases sharply, the network device can reduce the pilot overhead by adjusting the angle delay logarithm Q corresponding to each reference signal port, which is very flexible and convenient.

Further, each of the K weighting coefficients is a sum of at least one estimated value determined based on the precoding reference signal received on the at least one frequency domain unit, and each of the at least one estimated value The estimated value is obtained by performing channel estimation based on the precoding reference signal received on one of the at least one frequency domain unit.

As an embodiment, the precoding reference signal corresponds to P reference signal ports, the precoding of the precoding reference signal corresponding to each reference signal port includes spatial weights and frequency domain weights, and the precoding corresponding to each reference signal port The precoding of the coded reference signal is determined by the Q angle delay pairs in the K angle delay pairs; P<K, and P is a positive integer.

In this way, the configuration of the reference signal port in the prior art can be continued. That is, the time-frequency resource configured as the same reference signal port is still used to carry the reference signal of the reference signal port, but the difference is that the reference signal of the reference signal port is precoding loaded with Q angle delay pairs Reference signal. The terminal device does not need to perceive the specific process of the network device generating the precoding reference signal, and only needs to determine how to calculate the weighting coefficient corresponding to each angle delay pair according to the Q value. Therefore, the compatibility is strong.

Optionally, the Q angle vectors included in the Q angle delay pairs are Q airspace weight vectors, and each airspace weight vector in the Q airspace weight vectors includes multiple airspace weights; the Q The spatial weight vector is used to alternately pre-encode the reference signals carried on the N frequency domain units; the Q delay vectors contained in the Q angle delay pair are used to determine the N frequency domain weights. The N frequency domain weights correspond to the N frequency domain units, and are used for precoding the reference signals carried on the N frequency domain units.

That is, each of the Q angle vectors can be used as a precoding spatial weight vector. The Q angle vectors corresponding to the same reference signal port can be polled on N frequency domain units. Part of the frequency domain weights in the Q delay vectors can be loaded on the N frequency domain units. Q time delay vectors can be recombined to obtain Q frequency domain weight vectors, and each frequency domain weight vector is smaller than the length of the time delay vector, thereby reducing the number of frequency domain units loaded.

Further, the precoding corresponding to the p-th reference signal port among the P reference signal ports received on the n-th frequency domain unit among the N frequency domain units includes a spatial weight vector and at least one frequency domain Weight; the spatial weight vector is the (p-1)Q+(n-1)%Q+1th angle vector among the K angle vectors included in the K angle delay pairs; the at least one frequency domain Weight matrix

The value of the nth row and pth column in the matrix;

Determined by the matrix F, the matrix F is a matrix constructed by the P delay vectors contained in the P angle delay pairs, the matrix

And matrix F are satisfied:

Among them,% means the remainder operation, q:Q:end means from the qth value to the last value, the value is taken with the increment of Q; 1≤n≤N, 1≤p≤P, n and p are both Positive integer.

A specific implementation method is provided above. Through the above formula, the spatial weight vector and frequency domain weight loaded on each frequency domain unit of each reference signal port can be determined. However, it should be understood that the formula shown above is only a possible implementation manner, and should not constitute any limitation to this application.

With reference to the first aspect, in some possible implementations of the first aspect, the method further includes: receiving second indication information, where the second indication information is used to indicate a reporting rule for the K weighting coefficients.

Correspondingly, with reference to the second aspect, in some possible implementations of the second aspect, the method further includes: sending second indication information, where the second indication information is used to indicate a reporting rule for the K weighting coefficients.

Since Q weighting coefficients can be determined for each reference signal port, the network device can further indicate the reporting rules of P×Q (ie, K) weighting coefficients corresponding to the P reference signal ports, so as to facilitate the terminal device Generate the first indication information and parse the first indication information according to the same reporting rule as the network device.

Optionally, the coefficients c _{p, q} in the K weighting coefficients correspond to the p-th reference signal port among the P reference signal ports, and the Q-th angle delay centering corresponding to the p-th reference signal port The q-th angle delay pair, 1≤p≤P, 1≤q≤Q, are all integers.

A possible reporting rule is: sequentially take values from 1 to P to p, and for each value of p, report the corresponding Q coefficients.

If the above K weighting coefficients are expressed as a P×Q-dimensional matrix, then the reporting rule is to give priority to reporting by row.

Another possible reporting rule is: sequentially take values from 1 to Q to q, and for each value of q, report the corresponding P coefficients.

If the above K weighting coefficients are expressed as a P×Q-dimensional matrix, the reporting rule is to report by column first.

As another embodiment, the precoding reference signal corresponds to K reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port is determined by one of the K angle delay pairs.

That is, each reference signal port corresponds to an angle delay pair, and the number of reference signal ports P is equal to the number K of angle delay pairs. Based on such a design, the K weighting coefficients determined by the terminal device are weighting coefficients corresponding to K reference signal ports, and also weighting coefficients corresponding to K angle delay pairs. The terminal device can report the K weighting coefficients in the existing manner.

Based on the above design, the frequency domain units corresponding to the precoding reference signal of each reference signal port are discretely distributed in the frequency domain. The frequency domain units corresponding to the same reference signal port are evenly distributed at intervals of Q/D-1 frequency domain units.

With reference to the first aspect, in some possible implementations of the first aspect, the precoding of the precoding reference signal corresponding to each of the K reference signal ports includes a spatial weight vector and a frequency domain. Weight vector; the spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the angle vector of the k-th angle-delay pair in the K angle-delay pairs, the The frequency domain weight vector corresponding to the k-th reference signal port is determined by the delay vector of the k-th angle delay pair.

That is, each of the K angle vectors can be used as a precoding spatial weight vector. Since frequency domain units corresponding to the same reference signal port are evenly distributed at intervals of Q/D-1 frequency domain units, corresponding to the same time-frequency position on the N frequency domain units, Q angle vectors are used alternately. Each angle vector corresponds to a reference signal port.

K time delay vectors can be reorganized to obtain K frequency domain weight vectors. Since the frequency domain units corresponding to the same reference signal port are evenly distributed at intervals of Q/D-1 frequency domain units, it corresponds to the same time-frequency position on the N frequency domain units. The frequency domain weights are used alternately. Part of the frequency domain weights in the Q delay vectors can be reorganized to obtain Q frequency domain weight vectors. The length of each frequency domain weight vector is reduced compared to the length of the delay vector, so that the number of loaded frequency domain units can be reduced.

Further, the precoding frequency domain weight of the precoding reference signal of the kth reference signal port received on the nth frequency domain unit of the N frequency domain units is the kth angle delay pair The nth element in the delay vector of; 1≤n≤N, 1≤k≤K, n and k are integers.

With reference to the first aspect, in some possible implementation manners of the first aspect, the method further includes: receiving third indication information, where the third indication information is used to indicate the value of Q.

Correspondingly, with reference to the second aspect, in some possible implementation manners of the second aspect, the method further includes: sending third indication information, where the third indication information is used to indicate the value of Q.

That is, the Q value can be flexibly configured.

The network device sends third indication information to the terminal device to indicate the value of Q, so that the terminal device can determine the frequency domain unit corresponding to each angle delay pair according to the Q value, and then determine the weighting coefficient corresponding to each angle delay pair .

There are many ways for network equipment to indicate the Q value, which can be indicated through existing signaling or newly-added signaling, and can be indicated explicitly or implicitly. This application does not limit this.

In combination with the first aspect or the second aspect, in some possible implementation manners, the value of Q is a predefined value.

That is, the Q value can be fixed.

In a third aspect, a communication device is provided. The communication device may be a terminal device or a component in the terminal device. The communication device may include various modules or units for executing the first aspect and the method in any one of the possible implementation manners of the first aspect.

In a fourth aspect, a communication device 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 method in any one of the possible implementation manners of the first aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, the processor is coupled with the communication interface, and the communication interface is used to input and/or output information, and the information includes at least one of instructions and data.

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

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

In another implementation manner, the communication device is a chip or a chip system configured in a terminal device. When the communication device is a chip or a chip system configured in a terminal device, 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. The processor may also be embodied as a processing circuit or a logic circuit.

In a fifth aspect, a communication device is provided. The communication device may be a terminal device or a component in the terminal device. The communication device may include various modules or units for executing the second aspect and the method in any one of the possible implementation manners of the second aspect.

In a sixth aspect, a communication device 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 method in any one of the possible implementation manners of the second aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, the processor is coupled with the communication interface, and the communication interface is used to input and/or output information, and the information includes at least one of instructions and data.

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

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

In a seventh aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any one of the foregoing first aspect and the second aspect.

In the specific implementation process, the above-mentioned processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to the transmitter and transmitted by the transmitter, and the input circuit and output The circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In an eighth aspect, a processing device is provided, including a communication interface and a processor. The communication interface is coupled with the processor. The communication interface is used to input and/or output information. The information includes at least one of instructions and data. The processor is configured to execute a computer program, so that the processing device executes the method in any one of the possible implementation manners of the first aspect and the second aspect.

Optionally, there are one or more processors, and one or more memories.

In a ninth aspect, a processing device is provided, including a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through a receiver, and transmit signals through a transmitter, so that the processing device executes the method in any one of the possible implementation manners of the first aspect and the second aspect .

Optionally, there are one or more processors, and one or more memories.

Optionally, the memory may be integrated with the processor, or the memory and the processor may be provided separately.

In the specific implementation process, the memory can be a non-transitory (non-transitory) memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be set in different On the chip, the embodiment of the present application does not limit the type of the memory and the setting mode of the memory and the processor.

It should be understood that the related information interaction process, for example, sending instruction information may be a process of outputting instruction information from the processor, and receiving instruction information may be a process of inputting received instruction information to the processor. Specifically, the information output by the processing may be output to the transmitter, and the input information received by the processor may come from the receiver. Among them, the transmitter and receiver can be collectively referred to as a transceiver.

The devices in the eighth and ninth aspects described above may be chips, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; When implemented by software, the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory. The memory may be integrated in the processor, may be located outside the processor, and exist independently.

In a tenth aspect, a computer program product is provided. The computer program product includes: a computer program (also called code, or instruction), which when the computer program is run, causes a computer to execute the first aspect and the first aspect described above. The method in any one of the two possible implementation modes.

In an eleventh aspect, a computer-readable medium is provided, and the computer-readable medium stores a computer program (also referred to as code, or instruction) when it runs on a computer, so that the computer executes the above-mentioned first aspect and The method in any possible implementation of the second aspect.

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

Description of the drawings

FIG. 1 is a schematic diagram of a communication system applicable to the channel measurement method provided by an embodiment of the present application;

Figure 2 is a schematic diagram of precoding a reference signal based on a delay vector;

Fig. 3 is a schematic diagram of loading an angle delay pair to a reference signal and determining a weighting coefficient;

FIG. 4 is a schematic flowchart of a channel measurement method provided by an embodiment of the present application;

Figures 5 and 6 show Q angle delay pairs corresponding to one reference signal port;

FIG. 7 shows the corresponding relationship between the weighting coefficients of each RB and each angle delay pair;

FIG. 8 is a schematic flowchart of a channel measurement method provided by another embodiment of the present application;

FIG. 9 shows a schematic diagram of the distribution of multiple reference signal ports on N RBs;

10 and 11 are schematic block diagrams of communication devices provided by embodiments of the present application;

FIG. 12 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

Fig. 13 is a schematic structural diagram of a network device provided by an embodiment of the present application.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

The technical solutions provided in this application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future 5th Generation (5G) mobile communication system or new wireless Access technology (new radio access technology, NR). Among them, the 5G mobile communication system may include non-standalone (NSA) and/or standalone (SA).

The technical solution provided in this application can also be applied to machine type communication (MTC), inter-machine communication long-term evolution technology (Long Term Evolution-machine, LTE-M), and device-to-device (D2D) Network, machine to machine (M2M) network, Internet of things (IoT) network or other networks. Among them, 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 vehicle to other devices (vehicle to X, V2X, X can represent anything), for example, the V2X may include: vehicle to vehicle (V2V) communication, and the vehicle communicates with Infrastructure (vehicle to infrastructure, V2I) communication, vehicle to pedestrian communication (V2P) or vehicle to network (V2N) communication, etc.

The technical solution provided in this application can also be applied to future communication systems, such as the sixth-generation mobile communication system. This application does not limit this.

In the embodiment of the present application, the network device may be any device that has a wireless transceiver function. This equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC) , Base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (wireless fidelity, WiFi) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc., can also be 5G, such as NR , The gNB in the system, or the transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or it can also be a network node that constitutes a gNB or transmission point, Such as baseband unit (BBU), or distributed unit (DU), etc.

In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). CU implements some functions of gNB, and DU implements some functions of gNB. For example, CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) The function of the layer. The DU is responsible for processing physical layer protocols and real-time services, and implements the functions of the radio link control (RLC) layer, medium access control (MAC) layer, and physical (physical, PHY) layer. AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , Or, sent by DU+AAU. It can be understood that the network device may be a device that includes one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into network equipment in an access network (radio access network, RAN), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.

The network equipment provides services for the cell, and the terminal equipment communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network equipment, and the cell may belong to a macro base station (for example, a macro eNB or a macro gNB, etc.) , It may also belong to the base station corresponding to the small cell, where the small cell may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmit power, and are suitable for providing high-speed data transmission services.

In the embodiments of the present application, terminal equipment may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, Terminal, wireless communication equipment, user agent or user device.

The terminal device may be a device that provides voice/data connectivity to the user, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on. At present, some examples of terminals can be: mobile phones (mobile phones), tablets (pads), computers with wireless transceiver functions (such as laptops, palmtop computers, etc.), mobile Internet devices (mobile internet devices, MID), virtual reality Virtual reality (VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving (self-driving), and wireless in remote medical (remote medical) Terminals, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless Telephone, session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication function, computing device or connection Other processing equipment to wireless modems, in-vehicle equipment, wearable equipment, terminal equipment in the 5G network, or terminal equipment in the public land mobile network (PLMN) that will evolve in the future.

Among them, wearable devices can also be called wearable smart devices, which are the general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets and smart jewelry for physical sign monitoring.

In addition, the terminal device may also be a terminal device in an Internet of Things (IoT) system. IoT is an important part of the development of information technology in the future. Its main technical feature is to connect objects to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and interconnection of things. IoT technology can achieve massive connections, deep coverage, and power-saving terminals through, for example, narrowband (NB) technology.

In addition, terminal devices can also include sensors such as smart printers, train detectors, gas stations, etc. The main functions include collecting data (some terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices. .

In order to facilitate the understanding of the embodiments of the present application, a communication system suitable for the channel measurement method provided in the embodiments of the present application will be described in detail with reference to FIG. 1. FIG. 1 shows a schematic diagram of a communication system 100 applicable to the method provided in the embodiment of the present application. As shown in the figure, the communication system 100 may include at least one network device, such as the network device 101 shown in FIG. 1; the communication system 100 may also include at least one terminal device, such as the terminal devices 102 to 102 shown in FIG. 107. Wherein, the terminal devices 102 to 107 may be mobile or fixed. The network device 101 and one or more of the terminal devices 102 to 107 can communicate through a wireless link. Each network device can provide communication coverage for a specific geographic area, and can communicate with terminal devices located in the coverage area. For example, the network device may send configuration information to the terminal device, and the terminal device may send uplink data to the network device based on the configuration information; for another example, the network device may send downlink data to the terminal device. Therefore, the network device 101 and the terminal devices 102 to 107 in Fig. 1 constitute a communication system.

Optionally, the terminal devices can communicate directly. For example, D2D technology can be used to realize direct communication between terminal devices. As shown in the figure, between

terminal devices

105 and 106, and between

terminal devices

105 and 107, D2D technology can be used for direct communication. The terminal device 106 and the terminal device 107 may communicate with the terminal device 105 individually or at the same time.

The terminal devices 105 to 107 may also communicate with the network device 101, respectively. For example, it can directly communicate with the network device 101, as shown in the figure, the

terminal devices

105 and 106 can directly communicate with the network device 101; it can also communicate with the network device 101 indirectly, as the terminal device 107 in the figure communicates with the network device via the terminal device 105 101 communication.

It should be understood that FIG. 1 exemplarily shows a network device, multiple terminal devices, and communication links between each communication device. Optionally, the communication system 100 may include multiple network devices, and the coverage of each network device may include other numbers of terminal devices, for example, more or fewer terminal devices. This application does not limit this.

Each of the aforementioned communication devices, such as the network device 101 and the terminal devices 102 to 107 in FIG. 1, may be configured with multiple antennas. The plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. In addition, each communication device additionally includes a transmitter chain and a receiver chain. Those of ordinary skill in the art can understand that they can all include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, etc.). , Demodulator, demultiplexer or antenna, etc.). Therefore, multiple antenna technology can be used to communicate between network devices and terminal devices.

Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, and the embodiment of the present application is not limited thereto.

In order to better understand the embodiments of the present application, before introducing the embodiments of the present application, the following descriptions are made.

First, in order to facilitate understanding, the physical meanings of the letters involved in the embodiments of this application are described as follows:

K: the number of angle delay pairs, K>1 and an integer;

P: the number of reference signal ports, that is, the number of ports after spatial domain precoding and frequency domain precoding are performed on the reference signal, P≥1 and an integer;

Q-1: The number of frequency domain units between two adjacent frequency domain units corresponding to the same angular delay pair, used to describe the minimum between two frequency domain units corresponding to the same angular delay pair Interval, Q>1 and an integer;

D: Pilot frequency density, D>0;

N: the number of frequency domain units included in the transmission bandwidth of the reference signal, N>1 and an integer;

T: the number of transmitting antenna ports, T>1 and an integer;

F: a frequency domain weight matrix, which can be expressed as a matrix with a dimension of N×K in the embodiment of this application;

S: Spatial weight matrix, which can be expressed as a matrix with a dimension of T×K in the embodiment of this application;

C: A coefficient matrix, which can be expressed as a diagonal matrix with a dimension of K×K in the embodiment of the present application.

Second, in the embodiments of the present application, for ease of description, when serial numbers are involved, serial numbers can be started from 1. For example, N frequency domain units may include the first frequency domain unit to the Nth frequency domain unit, the K angle delay pairs may include the first angle delay pair to the Kth angle delay pair, and P references The signal port may include the first reference signal port to the P-th reference signal port, and so on. Of course, the specific implementation is not limited to this. For example, it can also be numbered consecutively from 0. For example, the N frequency domain units may include the 0th frequency domain unit to the N-1th frequency domain unit, and the K angle delay pairs may include the 0th angle delay pair to the K-1th angle delay pair, The P reference signal ports may include the 0th reference signal port to the P-1th reference signal port, etc., which are not listed here for brevity.

It should be understood that the above descriptions are all settings to facilitate the description of the technical solutions provided by the embodiments of the present application, and are not used to limit the scope of the present application.

Third, in this application, many places involve the transformation and sum of matrices and vectors, as well as the operation of functions. For ease of understanding, here is a unified description. The matrix A, parameters p, q, Q, a, b, N, etc. shown below are all examples.

For matrix A, the superscript T represents transpose, for example, ^AT represents the transpose of matrix (or vector) A. The superscript H represents the conjugate transpose, for example, A ^H represents the conjugate transpose of the matrix (or vector) A.

For matrix A, the function A(:, p) means to take the first row to the last row of the p-th column in the matrix A, that is, take the p-th column in the matrix A. A(q,:) represents taking the first column to the last column of the qth row in matrix A, that is, taking the qth row in matrix A.

Further, the function A(a, Q, b:, p) indicates that in the p-th column in the matrix, the starting behavior a and the ending behavior b are taken with Q as the incremental value. That is to say, the difference of the corresponding row number in matrix A of the obtained value is Q or an integer multiple of Q.

For example, the function A(1, Q, end:, p) indicates that the value of the p-th column of the matrix A is taken from the first row to the last row with the increment of Q. Assuming Q=2, if the total number of rows is an odd number, it means that starting from the first row of the p-th column of the matrix A, take the values of the first row, the third row, the fifth row, the seventh row and the last row; if If the total number of rows is an even number, it means that starting from the first row of the p-th column of the matrix A, the values of the first row, the third row, the fifth row, the seventh row, and the penultimate row are taken.

The function diag() represents a diagonal matrix.

The function N%Q means taking the remainder of N/Q.

function

Represents rounding up, and can also be expressed as floor().

Fourth, in the following, when it is described that there are Q-1 frequency domain units between two frequency domains, it can mean that the number of frequency domain units separated by not including these two frequency domain units is Q-1. . For example, there are 3 RBs between RB#1 and RB#5. It can be understood that the number of intervals is different from the increment value described above. When the increment value is Q, the number of intervals is Q-1. Among them, Q is only an example.

Fifth, in the embodiments shown below, the angle vector and the delay vector are both column vectors as an example to illustrate the embodiments provided in this application, but this should not constitute any limitation to this application. Based on the same concept, those skilled in the art can also think of other more possible expressions.

Sixth, in this application, "used to indicate" can include both used for direct indication and used 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 instruction 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 or the information to be indicated. Indicates the index of the information, etc. The information to be indicated can also be indicated indirectly 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, it is also possible to realize the indication of specific information by means of a pre-arranged order (for example, stipulated in an agreement) of various information, so as to reduce the indication overhead to a certain extent. At the same time, it can also identify the common parts of each information and give unified instructions, so as to reduce the instruction overhead caused by separately indicating the same information. For example, those skilled in the art should understand that the precoding matrix is composed of precoding vectors, and each precoding vector in the precoding matrix may have the same parts in terms of composition or other attributes.

In addition, the specific instruction manner may also be various existing instruction manners, such as but not limited to the foregoing instruction manners and various combinations thereof. For the specific details of the various indication modes, reference may be made to the prior art, which will not be repeated here. It can be seen from the above that, for example, when multiple pieces of information of the same type need to be indicated, a situation where different information is indicated in different ways may occur. In the specific implementation process, the required instruction method can be selected according to specific needs. The embodiment of the application does not limit the selected instruction method. As a result, the instruction method involved in the embodiment of the application should be understood as covering that can make the instruction to be instructed Various methods for obtaining information to be indicated.

The information to be instructed can be sent together as a whole, or divided into multiple sub-information to be sent separately, and the sending period and/or sending timing of these sub-information can 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 pre-defined, for example, pre-defined according to a protocol, or configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example, but not limited to, one or a combination of at least two of radio resource control signaling, medium access control (medium access control, MAC) layer signaling, and physical layer signaling. Among them, radio resource control signaling, such as packet radio resource control (RRC) signaling; MAC layer signaling, for example, includes MAC control element (CE); physical layer signaling, for example, includes downlink control information (downlink control). information, DCI).

Seventh, the definitions listed in this application for many characteristics (such as precoding matrix indicator (PMI), channel, RB, RBG, subband, PRG, RE, angle, and delay, etc.) are only used to The function of this feature is explained by way of example, and the detailed content can refer to the prior art.

Eighth, in the embodiments shown below, the first, second, and various numerical numbers are only for easy distinction for description, and are not used to limit the scope of the embodiments of the present application. For example, distinguish different instructions.

Ninth, "pre-defined" or "pre-configured" can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device (for example, including terminal devices and network devices). The specific implementation method is not limited. Wherein, "saving" may refer to storing in one or more memories. The one or more memories may be provided separately, or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partly provided separately, and partly integrated in a decoder, a processor, or a communication device. The type of the memory can be any form of storage medium, which is not limited in this application.

Tenth, the “protocols” involved in the embodiments of the present application may refer to standard protocols in the communication field, for example, may include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in this application.

Eleventh, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, and c can mean: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , B, and c. Among them, a, b, and c can be single or multiple.

Twelfth, in the embodiments of this application, the descriptions such as "when...", "under the condition of...", "if" and "if" all refer to the equipment under certain objective circumstances (such as terminal equipment). Or the network device) will make the corresponding processing, which is not a time limit, and the device (such as a terminal device or a network device) is not required to have a judging action when it is implemented, nor does it mean that there are other restrictions.

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

1. Channel reciprocity: In some communication modes, such as TDD, the uplink and downlink channels transmit signals on the same frequency domain resources and different time domain resources. In a relatively short time (for example, 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 equipment can measure the uplink channel based on the uplink reference signal, such as a sounding reference signal (SRS). The downlink channel can be estimated according to the uplink channel, so that the precoding matrix for downlink transmission can be determined.

However, in other communication modes, such as FDD, because the frequency band spacing between the uplink and downlink channels is much larger than the coherent bandwidth, the uplink and downlink channels do not have complete reciprocity, and the uplink channel is used to determine the precoding matrix for downlink transmission. It cannot be adapted to the downlink channel. However, the uplink and downlink channels in the FDD mode still have partial reciprocity, for example, the reciprocity of angle and the reciprocity of delay. Therefore, angle and delay can also be called reciprocity parameters.

When the signal is transmitted through the wireless channel, it can reach the receiving antenna through multiple paths from the transmitting antenna. Multipath time delay causes frequency selective fading, which is the change of frequency domain channel. The time delay is the transmission time of the wireless signal on different transmission paths, which is determined by the distance and speed, and has nothing to do with the frequency domain of the wireless signal. When signals are transmitted on different transmission paths, there are different transmission delays due to different distances. Since the physical location between the network equipment and the terminal equipment is fixed, the multipath distribution of the uplink and downlink channels is the same in terms of delay. Therefore, the uplink and downlink channels in the FDD mode with delay can be considered the same, or in other words, 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) at which the signal is transmitted through the transmitting antenna. In the embodiment of the present application, the angle may refer to the angle of arrival at which the uplink signal reaches the network device, and may also refer to the angle of departure at which the network device transmits the downlink signal. Due to the reciprocity of the transmission paths of the uplink and downlink channels on different frequencies, the arrival angle of the uplink reference signal and the departure angle of the downlink reference signal can be considered to be reciprocal.

In the embodiment of the present application, each angle can be characterized by an angle vector. Each delay can be characterized by a delay vector. Therefore, in the embodiment of the present application, an angle vector may represent an angle, and a delay vector may represent a time delay.

Each angle vector can be combined with a delay vector described below to obtain an angle delay pair. In other words, an angle delay pair may include an angle vector and a delay vector.

2. Angle vector: It can also be called a space vector, beam vector, etc. The angle vector can be understood as a precoding vector used for beamforming the reference signal. 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 angle vector can be a vector of length T. Among them, T can represent the number of transmitting antenna ports, T>1 and an integer. For an angle vector of length T, it contains T spatial weights (or weights for short), and the T weights can be used to weight the T transmit antenna ports so that the T transmit antennas The reference signal emitted by the port has a certain spatial directivity, so as to realize beamforming.

Precoding the reference signal based on different angle vectors is equivalent to beamforming the transmitting antenna port based on different angle vectors, so that the transmitted reference signals have different spatial directivities.

Optionally, the angle vector is a Discrete Fourier Transform (DFT) vector. The DFT vector may refer to the vector in the DFT matrix.

Optionally, the angle vector is the conjugate transpose vector of the DFT vector. The DFT conjugate transpose vector may refer to the column vector in the conjugate transpose matrix of the DFT matrix.

Optionally, the angle vector is an oversampled DFT vector. The oversampled DFT vector may refer to the vector in the oversampled DFT matrix.

In a possible design, the angle vector may be, for example, the 3rd Generation Partnership Project (3GPP) technical specification (TS) 38.214 version 15 (release 15, R15) or type II (type II) in R16. II) Two-dimensional (2dimensions, 2D)-DFT vector v _l,m defined in the codebook. In other words, the angle vector can be a 2D-DFT vector or an oversampled 2D-DFT vector.

It should be understood that the above examples of the specific form of the angle vector are only examples, and should not constitute any limitation to the application. For example, the delay vector can also be taken from the DFT matrix. This application does not limit the specific form of the delay vector.

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

If the real downlink channel is denoted as V, then V can be expressed as a matrix with a dimension of R×T. Among them, R is the number of receiving antenna ports, and T is the number of transmitting antenna ports; R and T are both positive integers. In downlink transmission, the precoded reference signal obtained by precoding the reference signal based on the angle vector can be transmitted to the terminal device through the downlink channel. Therefore, the channel measured by the terminal device according to the received precoding reference signal is equivalent to The channel with the angle vector loaded. For example, _{loading the angle vector ak} to the downlink channel V can be expressed as Va _k . In other words, the angle vector is loaded on the reference signal, that is, the angle vector is loaded on the channel.

3. Time delay vector: It can also be called a frequency domain vector. The delay vector is a vector used to represent the changing law of the channel in the frequency domain. As mentioned earlier, multipath delay causes frequency selective fading. According to the Fourier transform, the time delay of the signal in the time domain can be equivalent to the phase gradual change in the frequency domain.

Since the phase change of the channel in each frequency domain unit is related to the time delay, the change law of the phase of the channel in each frequency domain unit can be represented by a time delay vector. In other words, the delay vector can be used to represent the delay characteristics of the channel.

The delay vector can be a vector of length N. Wherein, N may represent the number of frequency domain units used to carry the reference signal, and N>1 and is an integer. For a delay vector of length N, it includes N frequency domain weights (or simply, weights), and the N weights can be used to perform phase rotation on N frequency domain units, respectively. By precoding the reference signals carried on the N frequency domain units, the frequency selection characteristics caused by the multipath delay can be precompensated. Therefore, the process of precoding the reference signal based on the delay vector can be regarded as the process of frequency domain precoding.

Precoding the reference signal based on different delay vectors is equivalent to performing phase rotation on each frequency domain unit of the channel based on different delay vectors. Moreover, the angle of phase rotation of the same frequency domain unit can be different.

Optionally, the delay vector is a DFT vector. The DFT vector may be a vector in the DFT matrix.

For example, the delay vector can be expressed as b _k ,

Among them, k = 1, 2, ..., K; K can represent the number of delay vectors; f ₁ , f ₂ , ..., f _N respectively represent the first, second to Nth frequency domain unit The carrier frequency.

Optionally, the delay vector is a conjugate transpose vector of the DFT vector. The DFT conjugate transpose vector may refer to the column vector in the conjugate transpose matrix of the DFT matrix.

Optionally, the delay vector is an oversampled DFT vector. The oversampled DFT vector may refer to the vector in the oversampled DFT matrix.

It should be understood that the above examples of the specific form of the delay vector are only examples, and should not constitute any limitation to the application. For example, the delay vector can also be taken from the DFT matrix. This application does not limit the specific form of the delay vector.

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

In downlink transmission, after the reference signal is precoded based on the delay vector, the precoded reference signal can be transmitted to the terminal device through the downlink channel. Therefore, the channel measured by the terminal device according to the received precoding reference signal is equivalent to The channel with the delay vector loaded. In other words, the delay vector is loaded on the reference signal, that is, the delay vector is loaded on the channel. Specifically, multiple weights in the delay vector are respectively loaded on multiple frequency domain units of the channel, and each weight is loaded on a frequency domain unit.

Taking the frequency domain unit as a resource block (resource block, RB) as an example, if the reference signal is pre-coded based on a delay vector of length N, the N weights in the delay vector can be loaded into the load on the On the reference signal of the N RBs, that is, the N elements in the delay vector are respectively loaded on the N RBs. Load the nth element in the delay vector b _k _{onto the channel V n} on the nth RB, for example, it can be expressed as

It should be understood that precoding the reference signal based on the delay vector is similar to the processing method of spatial precoding, except that the spatial vector (or angle vector) is replaced with a delay vector.

It should be noted that the frequency domain precoding of the reference signal based on the delay vector may be performed before or after the resource mapping, which is not limited in this application.

For ease of understanding, the process of precoding the reference signal _{based on the delay vector b k will be} described in detail below in conjunction with FIG. 2.

Fig. 2 shows a schematic diagram of precoding the reference signals carried on N RBs _{based on the delay vector bk.} The N RBs may include RB#1, RB#2 to RB#N, for example. Each square in the figure represents an RB. Although not shown in the figure, it can be understood that each RB in the figure may include one or more resource elements (RE) for carrying reference signals.

If the delay vector b _{k is} loaded on N RBs, corresponding phase rotations can be performed on the N RBs respectively. The N weights in the delay vector may correspond to the N RBs in a one-to-one correspondence. For example, the elements in the frequency domain vector b _k

Can be loaded on RB#1, the elements in _{the delay vector b k}

Can be loaded on RB#2, the elements in the _{delay vector b k}

Can be loaded on RB#N. By analogy, the nth element in the _{delay vector b k}

Can be loaded on RB#n. For the sake of brevity, I will not list them all here.

It should be understood that FIG. 2 is only an example, and shows an example of _{loading the delay vector b k} to N RBs. But this should not constitute any limitation to this application. The N RBs used to carry the reference signal in FIG. 2 may be consecutive N RBs or discontinuous N RBs, which is not limited in this application.

It should also be understood that the foregoing is only for ease of understanding, and a delay vector is taken as an example to illustrate the correspondence between weights in the delay vector and frequency domain units, but this should not constitute any limitation to the application. The network device can load more delay vectors on the above N RBs.

An example in which the RB is a frequency domain unit is shown above in conjunction with FIG. 2. However, it should be understood that this application does not limit the specific definition of the frequency domain unit.

The frequency domain unit may be, for example, a subband, or RB, or RB group (resource block group, RBG), precoding resource block group (precoding resource block group, PRG), and so on. This application does not limit this.

Optionally, each frequency domain unit is an RB. Each element in the delay vector can be loaded on one RB. In this case, the length N of the delay vector can be equal to the number of RBs in the broadband. For a delay vector, each weight in it corresponds to one RB.

Optionally, each frequency domain unit is a subband. Each element in the delay vector can be loaded on a subband. In this case, the length N of the delay vector can be equal to the number of subbands in the broadband. For a delay vector, each weight in it corresponds to a subband.

4. Reference signal (RS): It can also be called a pilot (pilot), reference sequence, etc. In the 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 it may be an 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 this application. This application does not exclude the possibility of defining other reference signals in future agreements to achieve the same or similar functions.

In the embodiment of the present application, the network device may precode the reference signal based on the angle vector and the delay vector to generate a precoded reference signal, or simply a precoded reference signal. The process of precoding the reference signal based on the angle vector and the delay vector has been described above, and for brevity, it will not be repeated here.

Since the reference signals involved in this application are all pre-coded reference signals, in the following for convenience of description, the pre-coded reference signals are simply referred to as reference signals.

5. Port: It can also be called an antenna port. In the embodiment of the present application, the port may include a transmitting antenna port, a reference signal port, and a receiving port.

Among them, the transmitting antenna port may refer to an actual independent transmitting unit (transceiver unit, TxRU). For example, in downlink transmission, the transmitting antenna port may refer to the TxRU of the network device. In the embodiment of the present application, the letter T can be used to indicate the number of transmitting antenna ports, and T>1 and is an integer.

The reference signal port may refer to a port corresponding to the reference signal. Since the reference signal is pre-coded based on the angle vector and the delay vector, the reference signal port may refer to the port of the pre-coded reference signal. For example, each reference signal port corresponds to an angle vector and a delay vector. In the embodiment of the present application, the letter P can be used to indicate the number of reference signal ports, and P≥1 and is an integer.

The receiving port can be understood as the receiving antenna of the receiving device. For example, in downlink transmission, the receiving port may refer to the receiving antenna of the terminal device. In the embodiment of the present application, the letter R can be used to indicate the number of receiving ports, and R≥1 and is an integer.

Corresponding to the receiving port, both the transmitting antenna port and the reference signal port can be referred to as the transmitting port.

6. The transmission bandwidth of the reference signal: it can refer to the bandwidth used to transmit the reference signal, which is a reference signal used for channel measurement, such as CSI-RS. The transmission bandwidth of the reference signal may be, for example, the total bandwidth of the resource of the reference signal sent by a certain terminal device as described below, for example, the precoding reference signal resource occupied by the P reference signal ports sent by a certain terminal device The total bandwidth of the resource.

In a possible design, the transmission bandwidth of the reference signal may be the frequency domain occupied bandwidth of the CSI measurement resource. The frequency-domain occupied bandwidth of the CSI measurement resource may be configured by high-level signaling, such as CSI-Frequency Occupation (CSI-Frequency Occupation).

It should be understood that the transmission bandwidth of the reference signal is named only for ease of description, and should not constitute any limitation in this application. This application does not exclude the possibility of using other names to express the same or similar meanings.

7. Pilot density: the ratio of resource elements (resource elements, RE) occupied by reference signals of the same reference signal port to the number of frequency domain units N in the transmission bandwidth of the reference signal. For example, the pilot density of the reference signal of a certain reference signal port is 1, which can indicate that in the bandwidth occupied by the reference signal of this reference signal port, each RB has an RE used to carry the reference signal port. Reference signal; for another example, the pilot density of the reference signal of a certain reference signal port is 0.5, which can indicate that in the bandwidth occupied by the reference signal of this reference signal port, one of every two RBs includes this The RE of the reference signal of the reference signal port, or in other words, there is at least one RB between two RBs used to carry the reference signal of this port.

In the embodiment of the present application, the pilot density may be a value less than or equal to 1. Optionally, the pilot density is 1 or 0.5.

8. Space-frequency matrix: It can be understood as a channel matrix in the frequency domain, which can be used to determine the precoding matrix.

In the embodiment of the present application, the space-frequency matrix can be used to determine the downlink channel matrix of each frequency domain unit, and then the precoding matrix corresponding to each frequency domain unit can be determined. The channel matrix corresponding to a certain frequency domain unit may be, for example, a conjugate transpose of a matrix constructed from column vectors corresponding to the same frequency domain unit in the space frequency matrix corresponding to each receiving port. For example, extracting the nth column vector in the space-frequency matrix corresponding to each receiving port, and arranging it from left to right according to the order of the receiving ports, a matrix of dimension T×R can be obtained. R represents the number of receiving ports, R≥ 1 and is an integer. After the matrix is conjugate transposed, the channel matrix V _{n of} the nth frequency domain unit can be obtained.

The channel matrix V _{n of} the nth frequency domain unit can be used to determine the precoding matrix of the nth frequency domain unit. For example, the channel matrix V _{n is} subjected to singular value decomposition (SVD) to obtain the Conjugate transpose. Or, performing SVD on the conjugate transpose of the channel matrix V _{n to obtain the precoding matrix.}

It should be understood that the method of determining the channel matrix from the space-frequency matrix and then determining the precoding matrix described above is only a possible implementation provided by this application, and should not constitute any limitation to this application.

It should also be understood that the space-frequency matrix is an intermediate quantity used to determine the precoding matrix. In the above process of determining the precoding matrix, the concept of the space-frequency matrix is introduced for the convenience of understanding and description, but this does not mean that the space-frequency matrix will be generated. Based on the same concept, those skilled in the art can obtain different forms such as vectors or ordered arrays through different algorithms to replace the space-frequency matrix, thereby determining the precoding matrix. This application does not limit this.

The space-frequency matrix can be denoted as H, and the space-frequency matrix can satisfy: H=FCS ^H. Among them, F can represent a matrix constructed from one or more delay vectors, S can represent a matrix constructed from one or more angle vectors, and C can represent a weighting coefficient construction corresponding to each angle vector and each delay vector Of the matrix.

In the embodiments of the present application, for ease of understanding and explanation, the matrix F constructed by one or more delay vectors is recorded as a frequency domain weight matrix, and the matrix S constructed by one or more angle vectors is recorded as a spatial weight matrix , The matrix C constructed by the weighting coefficient corresponding to each angle vector and each delay vector is recorded as the coefficient matrix.

Among them, the coefficient matrix C can be a K×K diagonal matrix, for example, it can be expressed as

The frequency domain weight matrix F may be, for example, a matrix with a dimension of N×K, for example, it may be expressed as [b ₁ ... b _K ]. The spatial weight matrix S may be, for example, a matrix with a dimension of T×K, for example, it may be expressed as [a ₁ ... a _K ]. Therefore, the space frequency matrix can satisfy:

It can be seen that each weighting coefficient in the coefficient matrix C corresponds to a delay vector in the frequency domain weight matrix F and an angle vector in the spatial domain weight matrix S. For example, for any integer value k from 1 to K, the element c _k,k in the kth row and kth column of the coefficient matrix C corresponds to the kth delay vector and the spatial domain in the frequency domain weight matrix F The weighting coefficient of the k-th angle vector in the weight matrix S.

The k-th delay vector in the frequency-domain weight matrix F and the k-th angle vector in the spatial weight matrix S can be combined to obtain an angle-delay pair, or space-frequency vector pair, space-frequency pair, etc. . Therefore, from the K delay vectors in the frequency domain weight matrix and the K angle vectors in the spatial weight matrix, K angle delay pairs can be combined, and each angle delay pair contains an angle vector and a time delay. Extension vector. The K angle delay pairs may correspond to the K weighting coefficients in the coefficient matrix C in a one-to-one correspondence. For example, the weighting coefficient c _{k, k} in the coefficient matrix C may correspond to the angle delay pair of the k-th delay vector and the k-th angle vector, that is, the k-th angle delay pair.

The above K angle delay pairs are different from each other. Any two angle delay pairs include different angle vectors, and/or any two angle delay pairs include different delay vectors. In other words, any two angle delay pairs are different at least in at least one of the following: the angle vector and the delay vector. Therefore, it can be understood that there may be one or more repeated delay vectors in the K delay vectors in the frequency domain weight matrix F, and there may also be one or more in the K angle vectors in the spatial weight matrix S. The repeated angle vectors are not limited in this application, as long as the K angle delay pairs obtained by the combination are different from each other. In other words, the above K angle delay pairs may be obtained by combining one or more mutually different angle vectors and one or more mutually different delay vectors. The subscripts 1 to K in the above delay vectors b ₁ to b ₄ and the angle vectors a ₁ to a ₄ are only convenient for distinguishing the delay vector and the angle vector corresponding to different angle delay pairs, and the delay vector in the vector Or the angle has nothing to do.

It should be understood that the frequency domain weight matrix F, the spatial domain weight matrix S, and the coefficient matrix C listed above are only examples for ease of understanding. For example, the coefficient matrix C may not be expressed in the form of a diagonal matrix. The coefficient matrix C can be expressed as a matrix of dimension L×M, L represents the number of delay vectors, M represents the number of angle vectors, L and M are both positive integers; the frequency domain weight matrix F can be expressed as N ×L matrix; the spatial weight matrix S can be expressed as a T×M matrix. For any integer value l from 1 to L and any integer value m from 1 to M, the element c _l,m in the lth row and mth column of the coefficient matrix C can correspond to the L delay vectors The m-th angle vector in the l-th delay vector and the M-th angle vector is the weighting coefficient corresponding to the l-th delay vector and the m-th angle vector.

If the coefficient matrix C is expressed as

The frequency-domain weight matrix F is expressed as [b ₁ ... b _L ], and the spatial-domain weight matrix S is expressed as [a ₁ ... a _M ], then the above-mentioned space-frequency matrix H can satisfy:

It can be understood that the L delay vectors in the frequency domain weight matrix F are different from each other, and the M angle vectors in the angle weight matrix S are also different from each other. The angle vectors can be combined to obtain L×M angle delay pairs.

It should be understood that the specific forms of the frequency domain weight matrix, the spatial domain weight matrix, and the coefficient matrix are only examples for ease of understanding, and should not constitute any limitation to the application. Based on the same concept, those skilled in the art can make mathematical transformations or equivalent replacements for the frequency domain weight matrix, spatial domain weight matrix and coefficient matrix listed above, such as transforming a matrix into a vector, or transforming a matrix As an ordered array, etc. These mathematical transformations or equivalent substitutions do not affect the scope of application of the method provided in this application, and therefore should fall within the scope of protection of this application.

It should also be understood that based on the same concept, those skilled in the art can perform mathematical transformations or equivalent replacements on the relationships between the space-frequency matrix and the frequency-domain weight matrix, the space-domain weight matrix, and the coefficient matrix listed above. For example, in another definition method, the space-frequency matrix can satisfy: H=SCF ^H , and so on. These mathematical transformations or equivalent substitutions do not affect the scope of application of the method provided in this application, and therefore should fall within the scope of protection of this application.

From the relational expression satisfied by the space-frequency matrix above, the space-frequency matrix can be determined by the weighted sum of one or more angle delay pairs. For example, if the space-frequency matrix H satisfies H=FCS ^H , the dimension of the space-frequency matrix H can be N×T; if the space-frequency matrix H satisfies H=SCF ^H , the dimension of the space-frequency matrix H can be T× N.

In combination with the foregoing, it can be known that the network device may pre-load multiple angle delay pairs on the reference signal, or in other words, precode the reference signal based on the multiple angle delay pairs. After the reference signal is transmitted to the terminal device via the downlink channel, the terminal device can perform channel estimation based on the received reference signal, and determine it based on the reference signal received on the same frequency domain unit corresponding to the same angle delay pair Perform full-band accumulation of the channel estimation value to obtain the weighting coefficient corresponding to the angle delay pair. The terminal device may feed back the weighting coefficients corresponding to the multiple angle delay pairs to the network device, so that the network device can reconstruct the downlink channel, and then determine the precoding matrix adapted to the downlink channel.

Fig. 3 shows the process of determining the weighting coefficient corresponding to the angle delay pair after loading the angle delay pair on N RBs. As shown in the figure, the network device can pre-encode the reference signal based on the k-th angle delay in the above K angle-delay pairs, that is, the angle vector a _k in the k-th angle delay pair and the time The delay vector b _{k is} respectively loaded on the N RBs shown in Fig. 3, and then channel estimation can be performed on the reference signals received on the N RBs to obtain N estimated values. The estimated value on the nth RB is recorded for

Then the weighting coefficient corresponding to the k-th angle delay pair can be obtained as

Since the network equipment separately pre-encodes and transmits the reference signal for each terminal equipment, the pilot overhead will increase linearly with the increase in the number of terminal equipment. If the number of terminal devices in the cell is large, the pilot overhead will become unacceptable.

In view of this, this application provides a channel measurement method in order to reduce pilot overhead.

In the following, the channel measurement method provided by the embodiment of the present application will be described in detail with reference to the accompanying drawings.

It should be understood that the following is only for ease of understanding and description, and the interaction between the network device and the terminal device is taken as an example to describe in detail the method provided in the embodiment of the present application. However, this should not constitute any limitation on the execution subject of the method provided in this application. For example, the terminal device shown in the following embodiments can be replaced with components configured in the terminal device (such as circuits, chips, chip systems, or other functional modules that can call and execute programs, etc.); the network devices shown in the following embodiments can be replaced For configuration and network equipment components (such as circuits, chips, chip systems or other functional modules that can call and execute programs, etc.). As long as the program recording the code of the method provided in the embodiment of the present application can be used to implement the channel measurement according to the method provided in the embodiment of the present application.

In order to avoid confusion, the following definition is made: K angle delay pairs included K delay vectors are used to construct the frequency domain weight matrix F, and the dimension of the frequency domain weight matrix F is N×K; K angles The K angle vectors included in the delay pair are used to construct the spatial weight matrix S, and the dimension of the constructed spatial weight matrix S is T×K. The frequency domain unit is RB. The number of RBs included in the reference signal resource is N.

In addition, for ease of understanding and description, the following embodiments all use a transmitting antenna and a receiving antenna port in a polarization direction as examples to illustrate the channel measurement method provided in the embodiments of the present application. However, it should be understood that a receiving port is taken as an example to illustrate the channel measurement method provided in the embodiment of the present application. It can be understood that, in the following embodiments, the polarization direction of the transmitting antenna of the network device is not limited, and the number of receiving antenna ports of the terminal device is also not limited.

If the transmitting antenna of the network device has multiple polarization directions, such as a dual-polarization antenna, the angle vector can still be a vector of length T. The network device may transmit the precoding reference signal corresponding to the same angle delay pair through the transmitting antennas in the two polarization directions. The space-frequency matrix satisfying H=FCS ^H can be expressed as an N×2T-dimensional matrix, and ^{the space-frequency matrix satisfying H=SCF H} can be expressed as a 2T×N-dimensional matrix, and so on.

If the terminal device has multiple receiving antenna ports, the terminal device can perform measurement and feedback based on the same method described below. For example, the first indication information generated by the terminal device in the following embodiment may be used to indicate R groups of weighting coefficients, and each group of weighting coefficients includes K weighting coefficients corresponding to K angle delay pairs.

FIG. 4 is a schematic flowchart of a channel measurement method 400 provided by an embodiment of the present application. As shown in FIG. 4, the method 400 may include step 410 to step 450. Hereinafter, each step in the method 400 will be described in detail with reference to the accompanying drawings.

In step 410, the network device generates a precoding reference signal.

The network device may pre-encode the reference signal based on the K angle delay pairs to obtain the pre-encoded reference signal. As mentioned above, the K angle delay pairs include one or more angle vectors and one or more delay vectors. The relationship between the angle delay pair and the angle vector and the delay vector has been described in detail above, and for the sake of brevity, it will not be repeated here.

The above-mentioned one or more angle vectors and one or more delay vectors may be based on the reciprocity of the uplink and downlink channels, and the stronger one or more angle vectors and the stronger one or more are determined by the network equipment based on the uplink channel measurement. Multi-delay vector. For example, the network device can determine the uplink channel by DFT in the space domain and the frequency domain, or use existing estimation algorithms, such as joint angle and delay estimation (JADE) algorithms. This application does not limit this.

The aforementioned one or more angle vectors and one or more delay vectors may also be statistically determined by the network device based on feedback results of one or more previous downlink channel measurements. This application does not limit this.

In the embodiment of the present application, in order to reduce the pilot overhead, the network device may reduce the delay of each angle to the number of loaded RBs. For example, each delay vector is loaded on a part of the N RBs, so that the RBs loaded with the reference signal of the same angle delay pair are discretely distributed among the N RBs. That is, the RB corresponding to each angular delay pair is a part of the N RBs.

As an embodiment, the network device may configure P reference signal ports for each terminal device, and each reference signal port corresponds to Q angle delay pairs, that is, the reference signal configured by the network device for each terminal device may be a load A precoding reference signal with a total of P×Q angle delay pairs is obtained. In other words, the precoding reference signal received by each terminal device corresponds to P reference signal ports. Since each reference signal port corresponds to Q angle delay pairs, that is, the network device generates a precoding reference signal for each terminal device. The coded reference signal may correspond to P×Q angle delay pairs. If the number of angle delay pairs corresponding to the precoding reference signal generated for each terminal device is denoted as K, then K=P×Q.

For each reference signal port, each of the Q angle vectors included in the Q angle delay pairs includes multiple spatial weights, and the Q angle vectors can be used as Q spatial weight vectors. In turn, the reference signals on the N RBs are pre-coded. That is, Q angle vectors corresponding to one reference signal port are used to perform precoding polling on N RBs.

For each reference signal port, the Q delay vectors included in the Q angle delay pairs are used to determine N frequency domain weights, and the N frequency domain weights can correspond to the N RBs for Precoding the reference signals carried on N RBs. That is, N frequency domain weights are determined from Q delay vectors corresponding to one reference signal port. The N frequency domain weights may be extracted from Q delay vectors.

For ease of understanding, the following describes Q angle delay pairs corresponding to one reference signal port in conjunction with FIG. 5 and FIG. 6. Assume that the reference signal port is the p-th reference signal port among the P reference signal ports, and p is any integer value from 1 to P. The precoding reference signals shown in FIG. 5 and FIG. 6 are carried on 18 RBs, and each reference signal port corresponds to 4 angle delay pairs. Among them, N=18 and Q=4. The 18 RBs may include RB#1 to RB#18.

Fig. 5 shows an example where the pilot density D is 1. The pilot density is 1, which means that each RB has an RE used to carry the reference signal of the same reference signal port. Although the RE in each RB is not shown in the figure, it can be understood that each RB in RB#1 to RB#18 in the figure has an RE for carrying the precoding reference signal of the same reference signal port. Since each reference signal port can correspond to Q angle delay pairs, consecutive Q RBs corresponding to the same reference signal port can correspond to Q different angle delay pairs, that is, each reference signal port corresponds to each reference signal port. The consecutive Q RBs may respectively correspond to Q different angle delay pairs. Therefore, in FIG. 5, every 4 consecutive RBs corresponding to the same reference signal port may correspond to 4 different angle delay pairs.

Assume that the four angular delay pairs corresponding to the same reference signal port shown in the figure include (a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), (a ₄ , b ₄ ). Then RB#1, RB#5, RB#9, RB#13, RB#17 can correspond to the same angle delay pair (a ₁ , b ₁ ), RB#2, RB#6, RB#10, RB #14, RB#18 can correspond to the same angle delay pair (a ₂ , b ₂ ), RB#3, RB#7, RB#11, RB#15 can correspond to the same angle delay pair (a ₃ ,b ₃ ), RB#4, RB#8, RB#12, and RB#16 may correspond to the same angle delay pair (a ₄ , b ₄ ). It can be seen that the minimum interval between RBs corresponding to each angular delay pair in FIG. 5 is 3 RBs. It can be seen that the number of RBs corresponding to each angle delay pair does not exceed

indivual. As in Fig. 5, the number of RBs corresponding to each angular delay pair is 4 or 5.

To avoid confusion, (a) in FIG. 5 shows an _{example of loading angle vectors a 1} to a ₄ on each RB, and (b) in FIG. 5 shows loading _{delay vectors b 1} to b ₄ To the examples on each RB.

_First look at (a) in Figure 5, the angle vector a 1 can be loaded on RB#1, RB#5, RB#9, RB#13, RB#17, and the angle vector a ₂ can be loaded on RB#2 , RB#6, RB#10, RB#14, RB#18, angle vector a ₃ can be loaded on RB#3, RB#7, RB#11, RB#15, angle vector a ₄ can be loaded On RB#4, RB#8, RB#12, RB#16. It can be found that on the 18 RBs arranged in sequence from RB#1 to RB#18, the angle vectors a ₁ to a ₄ are loaded on each RB in turn, forming multiple cycles, that is, corresponding to the same reference signal port. Every 4 consecutive RBs can correspond to 4 different angle vectors respectively.

Look at (b) in Figure 5. In the case of N=18 and D=1, the delay vectors b ₁ to b ₄ are expressed as follows:

As shown in the figure, the first weight in the _{delay vector b 1}

Can be loaded on RB#1, the second weight in the _{delay vector b 2}

Can be loaded on RB#2, the third weight in the _{delay vector b 3}

Can be loaded on RB#3, the fourth weight in the _{delay vector b 4}

Can be loaded on RB#4, the 5th weight in the _{delay vector b 1}

Can be loaded on RB#5, the sixth weight in the _{delay vector b 2}

Can be loaded on RB#6, the seventh weight in the _{delay vector b 3}

Can be loaded on RB#7, the 8th weight in the _{delay vector b 4}

Can be loaded on RB#8, and so on, until the 18th weight in the _{delay vector b 2}

Loaded on RB#18, that is, every 4 consecutive RBs corresponding to the same reference signal port can correspond to 4 different delay vectors.

As can be seen in conjunction with the figure, the pilot density D is 1, and the length of the delay vector is N. In the case of N=18 and Q=4, among the 18 weights in each delay vector, 1 of every 4 weights is loaded on one RB. The weights in the four delay vectors are loaded onto each RB in turn. That is to say, every 4 RBs of the 18 RBs form a cycle, from RB#1 to RB#4, the 4 RBs are loaded in turn and are taken from the 4 weights in the _{delay vectors b 1} to b _{4 respectively.} , From RB#5 to RB#8, the 4 RBs are loaded in turn and are taken from _{the 4 weights of the delay vectors b 1} to b ₄ , from RB#9 to RB#12, the 4 RBs are again _{The four weights in the delay vectors b 1} to b ₄ are taken in turn to be loaded, and so on, until each of the 18 RBs is loaded with a frequency domain weight.

Thus, the 18 RBs are loaded with 4 angle vectors and 4 delay vectors, that is, 4 angle delay pairs are loaded. It can be seen that when the pilot density is 1, there are at least 3 RBs between every two RBs loaded with the same angular delay pair, that is, Q-1 RBs.

For each reference signal port, the network device can load the Q angle delay pairs corresponding to the reference signal port onto the N RBs based on the method described above.

In an implementation manner, the network device can reorganize the frequency domain weight matrix F constructed from the K delay vectors to obtain a new frequency domain weight matrix

Then based on the frequency domain weight matrix obtained by recombination

Perform frequency domain precoding on the reference signal.

Specifically, the matrix

Between and F can meet:

q=1,...; Q, p=1,...,P. Among them, q:Q:end means from the qth to the last, the value is taken in increments of Q. For the specific meaning of the function, please refer to the previous description, for the sake of brevity, I will not repeat it here.

Exemplarily, for the p-th reference signal port, from the corresponding Q delay vectors, q is traversed from 1 to Q to determine the N frequency domain weights corresponding to the p-th reference signal port .

Substitute q=1, 2, 3, 4 into the above matrix

In the relational expression satisfied with F, we can get:

When q=1, starting from the first row of the first column in the matrix F, the weights are extracted with Q as the increment, and the extracted weights are used as the matrix

For example, in the above example, N=18, Q=4, then take the first row, fifth row, nineteenth row, thirteenth row, and thirteenth row of the first column in matrix F. 17 lines.

When q=2, starting from the second row of the second column of the matrix F, the weights are extracted with the increment of Q, and the extracted weights are used as the matrix

The weight of the second column of, for example, in the above example, take the second row, sixth row, tenth row, fourteenth row, and eighteenth row of the first column in matrix F.

When q=3, starting from the third row of the third column of the matrix F, the weights are extracted with Q as the increment, and the extracted weights are used as the matrix

The weight of the third column of, for example, in the above example, take the third row, the seventh row, the 11th row, and the 15th row of the third column in the matrix F.

When q=4, starting from the 4th row of the 4th column of the matrix F, the weights are extracted with Q as the increment, and the extracted weights are used as the matrix

For example, in the above example, take the 4th row, 8th row, 12th row, and 16th row of the 4th column in matrix F.

For example, it can be determined from the delay vectors b ₁ to b ₄ that the N frequency domain weights corresponding to the N RBs are as follows:

Based on the same method described above, the network device can determine the N×P frequency domain weights corresponding to the P reference signal ports from the K delay vectors. The N×P frequency domain weights can construct an N×P-dimensional matrix, that is, the matrix

It is an N×P dimensional matrix.

Network equipment based on matrix

When precoding the reference signal in the frequency domain, the matrix

The weight value of the nth row and pth column in is loaded on the nth RB corresponding to the pth reference signal port.

It should be understood that the matrix is reorganized based on matrix F

Furthermore, precoding the reference signal in the frequency domain is only a possible implementation manner, and should not constitute any limitation in this application. In the actual implementation process, the matrix

It may not necessarily be generated. Those skilled in the art can implement the above process through different algorithms based on the same concept. This application does not limit this.

When the network device performs spatial precoding on the reference signal, the spatial weight vector used may also be determined based on the reference signal port and the RB number. The spatial weight vector used by the nth RB corresponding to the pth reference signal port may be the (p-1)Q+(n-1)%Q+1th angle vector among the K angle vectors.

Combining the above example, Q=4, N=18, when p=1, n=1, the corresponding spatial weight vector is the first angle vector among K angle vectors; when p=1, n=2 , The corresponding airspace weight vector is the second angle vector among the K angle vectors; when p=1 and n=3, the corresponding airspace weight vector is the third angle vector among the K angle vectors; when When p=1 and n=4, the corresponding spatial weight vector is the fourth angle vector among the K angle vectors; when p=1 and n=5, the corresponding spatial weight vector is the K angle vector When p=1 and n=6, the corresponding airspace weight vector is the second angle vector in K angle vectors; when p=1 and n=7, the corresponding airspace weight The value vector is the third angle vector among the K angle vectors; when p=1 and n=8, the corresponding spatial weight vector is the fourth angle vector among the K angle vectors; and so on. It can be found that the first angle vector to the fourth angle vector among the K angle vectors can be loaded onto the N RBs in turn.

For ease of understanding, the process of loading multiple angle delay pairs corresponding to each reference signal port to the reference signal in the embodiment of the present application is described in combination with specific examples. However, these examples are only shown for ease of understanding. The above-listed spatial domain weight vectors, the corresponding relationship between each frequency domain weight and each reference signal port, each RB, and the corresponding relationship shown in order to facilitate understanding The formulas are just examples. Based on the same concept, those skilled in the art can make various possible mathematical transformations or equivalent substitutions to the above formulas. These mathematical transformations or equivalent substitutions should fall within the scope of protection of this application.

In order to better understand this embodiment, an example will be combined for description below. Fig. 6 shows an example where the pilot density D is 0.5. The pilot density is 0.5, which means that there is one RE in every two RBs for carrying the reference signal of the same reference signal port. To facilitate distinction, the RBs carrying the precoding reference signal are shown in squares with filling patterns in the figure, and the RBs not carrying the precoding reference signal are shown as blank squares. However, it should be understood that FIG. 6 only shows the RB carrying the precoding reference signal for one reference signal port. In the case where there are multiple reference signal ports, it is also possible that some of the precoding reference signals corresponding to the reference signal ports are carried on the RBs shown in blank squares in the figure. In addition, although the RE in each RB is not shown in the figure, it can be understood that every other RB in RB#1 to RB#18 in the figure contains an RE for carrying the reference signal of the same reference signal port. . As shown in the figure, RB#1, RB#3, RB#5, RB#7, RB#9, RB#11, RB#13, RB#15, RB#17 are used to carry the same reference signal port Reference signal, other RBs are not used to carry the reference signal of the reference signal port. The figure shown in the figure is only for illustration, and 9 RBs such as RB#2, RB#4, RB#6, RB#8, RB#10, RB#12, RB#14, RB#16, and RB#18 To carry the reference signal of the same reference signal port. There is no limitation here.

Since each reference signal port can correspond to Q angle delay pairs, consecutive Q/D RBs corresponding to the same reference signal port can correspond to Q different angle delay pairs. Therefore, in FIG. 6, consecutive 8 RBs corresponding to the same reference signal port can correspond to 4 different angle delay pairs.

Assume that the four angular delay pairs corresponding to the same reference signal port shown in the figure include (a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), (a ₄ , b ₄ ). Then RB#1, RB#9, RB#17 can correspond to the same angle delay pair (a ₁ ,b ₁ ), and RB#3, RB#11 can correspond to the same angle delay pair (a ₂ ,b ₂ ), RB#5, RB#13 can correspond to the same angle delay pair (a ₃ ,b ₃ ), RB#7, RB#15 can correspond to the same angle delay pair (a ₄ ,b ₄ ) .

Figure 6 shows that the angle vectors are loaded on different RBs. It can be found that on the 18 RBs arranged in sequence from RB#1 to RB#18, the angle vectors a ₁ to a ₄ are alternately loaded on 9 of the RBs used to carry the reference signal, forming multiple cycles.

In the case of N=18 and D=0.5, the delay vector may be a vector of length 9. Weight vectors for the frequency domain in the frequency domain may be weighted, for example from a delay _{vector. 1} b to b _4, it can be reconstructed from the portion by weight of ₄ vectors extracted _{delay. 1} b to b vector.

The following shows an example of the frequency domain weight vectors b ₁ ′ to b ₄ ′ _{reconstructed from the time delay vectors b 1} to b _4. According to the interval between the loaded RBs, the _{corresponding weights are extracted from the delay vectors b 1} to b ₄ , and the frequency domain weight vectors b ₁ ′ to b ₄ ′ are obtained as follows:

Then, as shown in Figure 6, the first weight in the _{delay vector b 1 '}

Can be loaded on RB#1, the second weight in the _{delay vector b 2 '}

Can be loaded on RB#3, the third weight in the _{delay vector b 3 '}

Can be loaded on RB#5, the fourth weight in the _{delay vector b 4 '}

Can be loaded on RB#7, the fifth weight in the _{delay vector b 1 '}

Can be loaded on RB#9, the sixth weight in the _{delay vector b 2 '}

Can be loaded on RB#11, the seventh weight in the _{delay vector b 3 '}

Can be loaded on RB#13, the eighth weight in the _{delay vector b 4 '}

Can be loaded on RB#15, the 9th weight in the _{delay vector b 1 '}

It is loaded on RB#17.

As can be seen in conjunction with the figure, the pilot density D is 0.5, and the length of the delay vector is N/2. In the case of N=18 and Q=4, among the 9 weights in each delay vector, 1 of every 4 weights is loaded on one RB. The weights in the four delay vectors are loaded onto each RB in turn. In other words, every 4 RBs among the 18 RBs form a cycle. Starting from RB#1, the 4 RBs, RB#1, RB#3, RB#5, and RB#7, are loaded in turn and are respectively taken from the 4 weights in the _{frequency domain weight vector b 1} 'to b _4'; RB # 9, RB # 11, RB # 13, RB # 15 and RB four turns are loaded from 'to ₄ b' ₄ weightings frequency domain values b ₁ weight vectors, respectively; RB # 17 is the last One RB corresponding to the same reference signal port, RB#17 is loaded with 1 weight _{taken from the frequency domain weight vector b 1 ′.} Thus, among the 18 RBs, every RB has 1 RB loaded into a frequency domain weight.

Thus, the 18 RBs are loaded with 4 angle vectors and 4 delay vectors, that is, 4 angle delay pairs are loaded. It can be seen that when the pilot density D is 0.5, there are at least 7 RBs between every two RBs loaded with the same angular delay pair, that is, Q/D-1 RBs.

Of course, when the pilot density D is not 1, the network device can still reorganize the frequency domain weight matrix F based on the method described above to obtain the frequency domain weight matrix

Then based on the frequency domain weight matrix obtained by recombination

Perform frequency domain precoding on the reference signal. The specific process is the same as that described above, for the sake of brevity, it will not be repeated here.

In addition, the spatial weight vector used when the network device performs spatial precoding on the reference signal may also be determined based on the method described above. The spatial weight vector used by the nth RB corresponding to the pth reference signal port may be the (p-1)Q+(n-1)%Q+1th angle vector among the K angle vectors. The specific process is the same as that described above, for the sake of brevity, it will not be repeated here.

It should be understood that the above is only for ease of understanding, taking the pilot density D of 1 and 0.5 as an example to illustrate in detail the Q angle delay pairs corresponding to a reference signal port, and how to load the Q angle delay pairs. The process to N RBs. Those skilled in the art can understand that, for any value of the pilot density, the network device can perform spatial and frequency precoding on the reference signal based on the method described above.

In addition, it can be seen from the two examples above that the RBs corresponding to the same angular delay pair are arranged at intervals of Q/D-1 RBs. The network device can configure the value of Q and/or D so that the value of Q/D is an integer.

It should also be understood that, although the foregoing describes in detail the process of performing spatial precoding and frequency domain precoding on the reference signal of a reference signal port by the network device in conjunction with FIG. 5 and FIG. 6. But this should not constitute any limitation to this application. The same RB may correspond to multiple reference signal ports, and is used to carry reference signals of multiple reference signal ports. The multiple reference signal ports can be multiplexed by means of frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM), etc., for example. RB resources. This application does not limit this.

In addition, the values of D, Q, N, etc. mentioned above are all examples, and should not constitute any limitation to this application.

Step 420: The network device sends a precoding reference signal. Correspondingly, in step 420, the terminal device receives the precoding reference signal.

The network device may transmit the precoding reference signal to the terminal device through the pre-configured reference signal resource. The process of the network device sending the precoding reference signal to the terminal device may be the same as the prior art, and for brevity, it will not be described in detail here.

It is understandable that the network device sends the reference signals of the P reference signal ports, and the terminal device can receive the reference signals of the P reference signal ports.

In step 430, the terminal device generates first indication information, which is used to indicate K weighting coefficients corresponding to K angle delay pairs.

The terminal device may perform channel estimation based on the precoding reference signal received in step 420 to obtain a channel estimation value corresponding to each reference signal port on each RB. In the embodiment of the present application, each reference signal port corresponds to Q angle delay pairs, and the terminal device can determine Q weighting coefficients based on the precoding reference signal of each reference signal port. Corresponding to P reference signal ports, a total of P×Q weighting coefficients can be determined, that is, K weighting coefficients.

When determining the K weighting coefficients, the terminal device needs to predetermine the number P of reference signal ports, the number Q of angle delay pairs corresponding to each reference signal port, and which RBs each angle delay pair is loaded on. That is, the D value, Q value, and P value need to be known in advance.

Wherein, the pilot density D and the number of reference signal ports P can be indicated by existing signaling, for example, by configuration signaling of reference signal resources.

In this embodiment, Q and P can satisfy: K=P×Q, so the terminal device only needs to know the values of any two of K, P, and Q.

One possibility is that Q can be a fixed value. Optionally, Q is a predefined value, for example, the protocol defines the Q value in advance. In this case, the network device only needs to indicate the D value and P value through existing signaling, and the terminal device can determine the D value, P value, and Q value.

Another possibility is that Q can be flexibly configured. Optionally, the method further includes: the network device sends third indication information, where the third indication information is used to indicate the value of Q. Correspondingly, the terminal device receives the third indication information. In other words, the third indication information is used for the terminal device to determine the value of Q.

Among them, the indication of Q may be an explicit indication or an implicit indication.

For example, the network device and the terminal device pre-appoint the correspondence between multiple possible values of Q and multiple indexes, and the network device may indicate the index corresponding to the current Q value through the third indication information to indicate the Q value.

Alternatively, the network device and the terminal device pre-agreed on the correspondence between multiple possible values of K/P and multiple indexes, and the network device may indirectly indicate Q through the third indication information indicating the ratio of the currently used K to P Value.

For another example, the protocol may predefine the correspondence between multiple possible values of Q and multiple values of the transmission bandwidth of the reference signal. For example, when the transmission bandwidth of the reference signal is 20 megabytes (M), Q=8; when the transmission bandwidth of the reference signal is 10M, Q=4, and so on. The network device may indicate the bandwidth currently allocated to the terminal device through the third indication information to implicitly indicate the Q value currently allocated to the terminal device. In this case, the third indication information may be, for example, existing configuration signaling about the transmission bandwidth of the reference signal. For example, the signaling may be CSI-Frequency Occupation.

For another example, the network device may directly indicate the value of Q or indicate the value of Q-1 through the third indication information.

For another example, the network device may indicate the value of K through the third indication information to indirectly indicate the value of Q.

It should be understood that the third indication information may be, for example, existing signaling, or carried in existing signaling, or may also be newly-added signaling. This application does not limit this.

Of course, the network device may also indicate the value of one or more of D, K, P, and Q through an additional signaling. This application is not limited to this.

After determining the D value, P value, and Q value, the terminal device can determine the above K weighting coefficients. In this embodiment, each of the K weighting coefficients may be determined by the precoding reference signal received on the RBs corresponding to the same angle delay pair among the N RBs, which may be specifically determined by the above corresponding to the same angle delay pair. The channel estimation value on the RB of an angle delay pair is accumulated and summed. As mentioned above, the RB corresponding to each angular delay pair is a part of the RBs in the N RBs, that is, the weighting coefficient corresponding to each angular delay pair is determined by the channel estimation value on the part of the RBs in the N RBs. It is obtained by accumulation and summation, without the need to accumulate and sum the channel estimation values on the N RBs.

Take the example shown in Figure 5 as an example below. _{The terminal device can receive the precoding reference signal corresponding to the angle delay pair (a 1} , b ₁ ) on RB#1, RB#5, RB#9, RB#13, and RB#17, and on RB#2, The precoding reference signal _{corresponding to the angle delay pair (a 2} , b ₂ ) is received on RB#6, RB#10, RB#14, and RB#18. _{The precoding reference signal corresponding to the angle delay pair (a 3} , b ₃ ) is received on RB#15, and the corresponding angle delay pair is received on RB#4, RB#8, RB#12, and RB#16. (a ₄ , b ₄ ) precoding reference signal. As mentioned above, the above four angle delay pairs (a ₁ , b ₁ ), (a ₂ , b ₂ ), (a ₃ , b ₃ ), (a ₄ , b ₄ ) correspond to the p-th reference signal port. Therefore, the terminal device can receive the precoding reference signal corresponding to the same reference signal port on RB#1 to RB#18.

The weighting coefficient corresponding to each angle delay pair may be determined by the channel estimation value of the precoding reference signal corresponding to the angle delay pair, and specifically may be the channel estimation value of each RB loaded with the angle delay pair. Cumulative summation. Each reference signal port in FIG. 5 corresponds to 4 angle delay pairs, so the terminal device performs channel estimation for the precoding reference signal of each reference signal port, and can obtain weighting coefficients corresponding to the 4 angle delay pairs.

As shown in Figure 5, _{the weighting coefficient corresponding to the angle delay pair (a 1} , b ₁ ) can be determined based on the precoding reference signals received on RB#1, RB#5, RB#9, RB#13, and RB#17. . The terminal equipment performs channel estimation based on the precoding reference signal _{corresponding to the angle delay pair (a 1} , b ₁ ) received on RB#1, RB#5, RB#9, RB#13, and RB#17, which can be Get 5 channel estimates. The cumulative sum of the five channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 1} , b _{1 ).}

The weight coefficient corresponding to the angle delay pair (a ₂ , b ₂ ) may be determined based on the precoding reference signals received on RB#2, RB#6, RB#10, RB#14, and RB#18. The terminal device performs channel estimation based on the precoding reference signal _{corresponding to the angle delay pair (a 2} , b ₂ ) received on RB#2, RB#6, RB#10, RB#14, and RB#18, and can Get 5 channel estimates. The cumulative sum of the five channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 2} , b _{2 ).}

Similarly, the weighting coefficients corresponding to the angle delay pair (a ₃ , b ₃ ) can be four determined based on the precoding reference signals received on RB#3, RB#7, RB#11, and RB#15. The cumulative sum of the channel estimation value; _{the weighting coefficient corresponding to the angle delay pair (a 4} , b ₄ ) may be determined based on the precoding reference signal received on RB#4, RB#8, RB#12, and RB#16 The cumulative sum of the 4 channel estimates.

FIG. 7 shows the corresponding relationship between each RB in FIG. 5 and the weighting coefficient of each angle delay pair. As shown in the figure, the channel estimation values determined based on the precoding reference signals received on RB#1, RB#5, RB#9, RB#13, and RB#17 are:

The 5 channel estimation values are accumulated and summed, and the weighting coefficient corresponding to the _{angle delay pair (a 1} , b _{1) can be obtained.} Therefore, the weighting coefficient c _p,1 corresponding to the angle delay pair (a ₁ ,b ₁ ) can satisfy:

Among them, the subscript p,1 indicates the first angle delay pair corresponding to the p-th reference signal port; the superscript n indicates the nth RB, and Γ ₁ indicates that the first corresponding to the p-th reference signal port is loaded. RBs of a pair of angle delays, for example, Γ ₁ includes RB#1, RB#5, RB#9, RB#13, and RB#17.

The channel estimation values determined based on the precoding reference signals received on RB#2, RB#6, RB#10, RB#14, and RB#18 are:

The 5 channel estimation values are accumulated and summed, and the weighting coefficient corresponding to the _{angle delay pair (a 2} , b _{2) can be obtained.} Therefore, the weighting coefficient c _p,2 corresponding to the angle delay pair (a ₂ ,b ₂ ) can satisfy:

Among them, the subscript p,2 represents the first angle delay pair corresponding to the p-th reference signal port; Γ ₂ represents the RB loaded with the second angle delay pair corresponding to the p-th reference signal port, for example, Γ ₂ includes RB#2, RB#6, RB#10, RB#14, and RB#18.

Based on the same method described above, the terminal device can determine that the weighting coefficient c _p,4 _{corresponding to the angle delay pair (a 3} , b ₃ ) can satisfy:

The weighting coefficient c _p,4 corresponding to the angle delay pair (a ₄ ,b ₄ ) can satisfy:

Among them, the subscript p,3 represents the third angle delay pair corresponding to the p-th reference signal port; Γ ₃ represents the RB loaded with the third angle delay pair corresponding to the p-th reference signal port, for example, Γ ₃ includes RB#3, RB#7, RB#11, RB#15; the subscript p, 4 indicates the fourth angle delay pair corresponding to the p-th reference signal port; Γ ₄ indicates that the p-th above is loaded The RB of the fourth angle delay pair corresponding to the reference signal port, for example, Γ ₄ includes RB#4, RB#8, RB#12, and RB#16.

Therefore, the terminal device can determine 4 weighting coefficients corresponding to the p-th reference signal port.

Based on the same method described above, the terminal device can traverse the value of p from 1 to P to obtain Q weighting coefficients corresponding to each reference signal port. Therefore, the terminal equipment can determine a total of P×Q weighting coefficients, that is, K weighting coefficients. If the K weighting coefficients are expressed by a matrix, they can be expressed as a coefficient matrix C as follows:

_{Wherein, c p,q} in the coefficient matrix C can represent the q-th angle time corresponding to the p-th reference signal port among the P reference signal ports and the Q-th angle delay pair corresponding to the p-th reference signal port. The weighting factor of the extension.

If the coefficient matrix C is expressed as a P×Q-dimensional matrix, each row of the matrix corresponds to a reference signal port, and each row includes the weighting coefficients of Q angle delay pairs corresponding to the reference signal port. If the coefficient matrix C is expressed as a Q×P-dimensional matrix, each column of the matrix corresponds to a reference signal port, and each column includes the weighting coefficients of Q angle delay pairs corresponding to the reference signal port.

The feedback of the K weighting coefficients by the terminal device may be reported in sequence according to the reporting rule indicated by the network device. Optionally, the method further includes: the network device sends second indication information, where the second indication information is used to indicate a reporting rule. Correspondingly, the terminal device receives the second indication information.

After the network device indicates the reporting rule to the terminal device through the second instruction information, the terminal device can generate the first instruction information based on the reporting rule, and then in step 440, send the first instruction information to the network device.

The different reporting rules will be explained in detail below with specific examples.

Exemplarily, a possible reporting rule is to sequentially report Q weighting coefficients corresponding to each reference signal port in a sequence from the first reference signal port to the P-th reference signal port. That is, the values of p are sequentially taken from 1 to P, and for each value of p, the corresponding Q weighting coefficients are reported,

Taking the coefficient matrix C as the above-mentioned P×Q-dimensional matrix as an example, the terminal device may preferentially report by row, from the first row to the P-th row, sequentially reporting the Q weighting coefficients in each row. For example, according to c _1,1 , c _1,2 , …, c _1,Q , c _2,1 , c _2,2 , …, c _2,Q , …, c _P,1 , c _P,2 ,..., c _{P, Q} are reported in the order of K weighting coefficients.

Another possible reporting rule is to first report the weighting coefficient of the first angle delay pair corresponding to P reference signal ports, and then report the weighting coefficient of the second angle delay pair corresponding to P reference signal ports , And so on, until finally, report the weighting coefficient of the Q-th angle delay pair corresponding to the P reference signal ports. That is, the values of q are sequentially taken from 1 to Q, and for each value of q, the corresponding P weighting coefficients are reported.

Taking the coefficient matrix C as the above-mentioned P×Q-dimensional matrix as an example, the terminal device may preferentially report by column, from the first column to the Q-th column, sequentially reporting the P weighting coefficients in each column. For example, according to c _1,1 , c _2,1 , …, c _P,1 , c _1,2 , c _2,2 , …, c _P,2 , …, c _1,Q , c _2,Q ,..., c _{P, Q} are reported in the order of K weighting coefficients.

The report of the above K weighting coefficients by the terminal device may, for example, use the quantized value, the index of the quantized value, or other forms to report. This application does not limit this.

In a possible implementation manner, the terminal device may perform normalization processing on the K weighting coefficients, and quantize and report the result of the normalization processing. The so-called normalization process is the process of controlling the amplitude value of all weighting coefficients within the range of not exceeding 1 within the range of the normalization unit.

Exemplarily, the terminal device may use the weighting coefficient with the largest magnitude among the K weighting coefficients as a reference to perform normalization processing. The terminal device may divide the amplitudes of the remaining weighting coefficients except the weighting coefficient with the largest amplitude by the amplitude of the weighting coefficient with the largest amplitude to obtain the ratio corresponding to each weighting coefficient. After the normalization process, the amplitude of the weighting coefficient with the largest amplitude is normalized to 1, and the remaining weighting coefficients are their respective ratios to the maximum amplitude. The terminal device may generate the first indication information according to the above-mentioned reporting rule based on the quantized value of each normalized result. The terminal device can use the first indication information to indicate the position of the weighting coefficient of the maximum amplitude, for example, the row and column in the coefficient matrix with the largest amplitude, and can use the first indication information to indicate the quantization of the remaining weighting coefficients. value.

In another example, the terminal device may use the first weighting coefficient among the K weighting coefficients, for example, c _1,1 in the aforementioned coefficient matrix C as a reference to perform normalization processing. The specific processing method is similar to that described above, for the sake of brevity, it will not be repeated here. Since it is pre-defined that the first weighting coefficient of the K weighting coefficients is used as a reference for normalization processing, when the terminal device indicates the K weighting coefficients through the first indication information, it may not indicate the weighting as the reference. The position of the coefficient directly indicates the quantized value corresponding to the remaining weighting coefficients.

In fact, the terminal device can use any one of the K weighting coefficients as a reference to normalize the K weighting coefficients. For specific implementation methods, please refer to the above description. For brevity, it will not be repeated here.

It should be understood that when the terminal device indicates the aforementioned K weighting coefficients through the quantized value after the normalization process, it does not necessarily indicate all the quantized values of the K weighting coefficients to the network device. For example, in the above example, the quantized value of the weighting coefficient used as the reference may not be indicated, but the network device can still recover the above K weighting coefficients according to the information indicated by the terminal device. Therefore, it can be considered that the first indication information is used to indicate K weighting coefficients.

As can be seen in the previous description in conjunction with Figure 2, when the network device generates the precoding reference signal, each angle delay pair can be loaded on each of the N RBs, and the terminal device is determined to be with each RB. When the angle delay is used for the corresponding weighting coefficient, the channel estimation values obtained on the N RBs are accumulated in the full band, that is, the N channel estimation values are accumulated and summed. This method can coexist with the method provided in this embodiment. For example, the network device may select one of them to perform downlink channel measurement according to factors such as current resource usage and the number of terminal devices. In other words, the precoding reference signal sent by the network device may be the reference signal of the K reference signal ports corresponding to the K angle delay pairs, and each angle delay pair is loaded on the N RBs; it is also possible that each reference signal is loaded on the N RBs. The signal port corresponds to Q angle delay pairs, and each angle delay pair is loaded on part of the N RBs.

However, since the terminal device is not aware of the specific implementation of the precoding reference signal generated by the network device, the terminal device does not know whether a reference signal port corresponds to one angle delay pair or multiple angle delay pairs, in other words, the terminal device It is not known whether the angle delay pair loaded by the network device at the same position on the N RBs is the same angle delay pair or different delay pairs, that is, the terminal device does not know whether the received precoding reference signal is according to What is generated in the manner shown in FIG. 2 is still generated in the manner shown in FIG. 5 or FIG. 6. Therefore, the terminal device does not know whether to perform full-band accumulation on the channel estimation values on N RBs or to perform full-band accumulation on the channel estimation values of part of the N RBs when determining the corresponding weighting coefficient of an angle delay pair. Cumulative summation.

In an implementation manner, the network device may pre-configure the behavior of the terminal device through signaling. For example, the network device can notify the terminal device through signaling to perform full-band accumulation on the channel estimation values on N RBs when determining the corresponding weighting coefficient of an angle delay pair, or how many every N RBs The RB performs accumulation and summation of channel estimation values.

In another implementation manner, the network device can be implicitly indicated by the Q value. For example, if the network device indicates that the Q value is 1, it means that the minimum interval between two RBs corresponding to the same angular delay pair is 0, that is, the RBs corresponding to the same angular delay pair are consecutive in N RBs For distribution, the weighting coefficient corresponding to the angle delay pair can be determined by performing full-band accumulation on the channel estimation values on the N RBs. If the network device indicates that the Q value is greater than 1, it means that the minimum interval between two RBs corresponding to the same angular delay pair is 1 RB, that is, the RBs corresponding to the same angular delay pair are not among the N RBs. Continuous distribution, the channel estimation value can be accumulated and summed every Q/D-1 RB among the N RBs.

Among them, there may be many methods for the network device to indicate whether the Q value is greater than 1. For example, it is indicated by 1 indicator bit, such as "1" means greater than 1, and "0" means equal to 1; for example, it is indicated by indicating the specific value of Q. The indication of the specific value of Q has been described in detail above. Concise, I won't repeat it here.

In addition, as described above, the Q value may also be a fixed value. In this case, the system can agree to perform precoding and channel measurement on the reference signal according to the method described above.

In step 440, the terminal device sends first indication information. Correspondingly, the network device receives the first indication information.

The first indication information may be, for example, channel state information (channel state information, CSI), may also be part of information elements in the CSI, or may also be other information. Exemplarily, the first indication information is a precoding matrix indicator (precoding matrix indicator, PMI). This application does not limit this. The first indication information may be carried in one or more messages in the prior art and sent by the terminal device to the network device, or carried in one or more newly designed messages and sent by the terminal device to the network device. For example, the terminal device may send the first indication information to the network device through physical uplink resources, such as physical uplink share channel (PUSCH) or physical uplink control channel (PUCCH), to facilitate the network device The precoding matrix is determined based on the first indication information.

The specific method for the terminal device to send the first indication information to the network device through the physical uplink resource may be the same as the prior art. For brevity, a detailed description of the specific process is omitted here.

In step 450, the network device determines the precoding matrix corresponding to each frequency domain unit according to the first indication information.

Based on the received first indication information, the network device can recover K weighting coefficients corresponding to K angle delay pairs, and then can combine the frequency domain weighting matrix F and the spatial domain weighting matrix S used in the previous precoding, Determine the precoding matrix.

Exemplarily, the network device may obtain Q weighting coefficients corresponding to each of the P reference signal ports based on the rule of reporting K weighting coefficients by the terminal device. The network device may generate a K×K-dimensional diagonal matrix based on the K weighting coefficients, and the K elements on the diagonal of the K×K-dimensional diagonal matrix are the above K weighting coefficients. The K weighting coefficients have a one-to-one correspondence with the K delay vectors in the frequency domain weighting matrix F and the K angle vectors in the spatial weighting matrix S. Therefore, the network equipment can determine the space-frequency matrix H as shown in the following formula:

in,

Elements in

Indicates the recovery value, the diagonal matrix

It can be K weighting coefficients recovered by the above network equipment

to

Constructed K×K dimensional diagonal matrix. in,

The corresponding relationship with the above c _{p, q} can be determined by the following formula: k=(p-1)×Q+q. E.g,

Can correspond to c _1,1 above,

Can correspond to c _1,2 in the above,

Can correspond to c _{P,Q above} . For the sake of brevity, I will not list them all here.

After determining the space-frequency matrix H, the network device can determine the precoding suitable for each RB according to the downlink channel corresponding to each RB. Here, the precoding matrix corresponding to the RB may refer to the precoding matrix determined based on the channel matrix corresponding to the RB with the granularity of the RB, or in other words, the precoding matrix determined based on the precoding reference signal received on the RB , Can be used to pre-code the data transmitted through the RB. The downlink channel corresponding to the RB may refer to a downlink channel determined based on the precoding reference signal received on the RB, and may be used to determine the precoding matrix corresponding to the RB.

It should be understood that the calculation formula for determining the space-frequency matrix H shown above is only a possible implementation manner provided by this application, and should not constitute any limitation to this application. The technicians of this application can make mathematical transformations or equivalent substitutions based on the same concept to determine the space-frequency matrix H. In addition, the space-frequency matrix H does not necessarily have to be generated. By using different algorithms, those skilled in the art can even directly obtain the precoding matrix corresponding to each RB.

Based on the above technical solution, the network device can load K angle delay pairs on part of the N RBs, so that the number of RBs loaded on one angle delay pair can be reduced. If each angle delay pair is loaded on N RBs, N RBs are needed to carry the precoding reference signal corresponding to one angle delay pair; but if each angle delay pair is loaded into N RBs On the part of RBs, the N RBs originally used to carry one angular delay pair can be used to carry the precoding reference signals corresponding to more angular delay pairs. When the angular delay pair number K is constant, the pilot overhead can be reduced. In the case of a sharp increase in the number of terminal devices, the pilot overhead can be reduced by adjusting the angle delay logarithm Q corresponding to each reference signal port, so as to ensure that effective spectrum resources are fully utilized.

Correspondingly, in the embodiment of the present application, the terminal device can also determine the weighting coefficient corresponding to the angle delay pair according to the channel estimation value on the RB loaded with the same angle delay pair, which reduces the calculation of the terminal device. quantity.

At the same time, the configuration of the reference signal port in the prior art can still be used in the embodiments of the present application. That is, the time-frequency resources configured as the same reference signal port are used to carry the precoding reference signals corresponding to Q angle delay pairs. The terminal device does not need to perceive the specific process of the network device generating the precoding reference signal, and only needs to determine how to calculate the weighting coefficient corresponding to each angle delay pair according to the Q value. Therefore, the compatibility is strong, and the realization is flexible and convenient.

FIG. 8 is a schematic flowchart of a channel measurement method 800 provided by another embodiment of the present application. Different from the method shown in FIG. 4 above, the reference signal port in the channel measurement method shown in FIG. 8 corresponds to the angle delay on a one-to-one basis. In other words, the number P of reference signal ports is equal to the logarithm K of the angle delay. The precoding reference signals corresponding to the same reference signal port are discretely distributed on N RBs.

As shown in FIG. 8, the method 800 may include steps 810 to 850. The method shown in FIG. 8 will be described in detail below with reference to the accompanying drawings.

In step 810, the network device generates a precoding reference signal.

The network device may pre-encode the reference signal based on the K angle delay pairs to obtain the pre-encoded reference signal. As mentioned above, the K angle delay pairs include one or more angle vectors and one or more delay vectors. The relationship between the angle delay pair, the angle vector and the delay vector, and the method for determining the K angle delay pairs have been explained above, and for the sake of brevity, it will not be repeated here.

In order to reduce the pilot overhead, the network device may reduce the number of RBs loaded for each angular delay pair, so that the RBs corresponding to each angular delay pair are part of the N RBs. For example, when the pilot density D is 1, the RBs corresponding to each angular delay pair may be distributed at intervals of Q-1. In other words, the RBs corresponding to each angular delay pair can be distributed at intervals of Q/D-1. That is to say, among the N RBs, one RB in each Q/D RB corresponds to the same angle delay pair. The minimum distance between any two RBs corresponding to the same angular delay pair is Q/D-1 RBs.

As an embodiment, the network device may configure K reference signal ports for each terminal device, and each reference signal port corresponds to an angle delay pair. That is, the reference signal configured by the network device for each terminal device may be a precoding reference signal loaded with K angle delay pairs. In other words, the precoding reference signal received by each terminal device corresponds to K reference signal ports. Since the network equipment loads each angle delay pair on part of the N RBs, and each reference signal port corresponds to an angle delay pair, each reference signal port is also discrete on the N RBs. distributed. That is, the RBs corresponding to each reference signal port may be distributed at intervals of Q/D-1. The minimum distance between any two RBs corresponding to the same reference signal port is Q/D-1 RBs.

FIG. 9 shows an example of the distribution of multiple reference signal ports on N RBs. As shown in Figure 9, N=18, Q=4, and D=1. The 18 RBs may include RB#1 to RB#18. Although not shown in the figure, those skilled in the art can understand that when the pilot density D is 1, each RB in the figure has an RE for carrying the precoding reference signal of the same reference signal port. .

FIG. 9 shows the precoding reference signal of 4 reference signal ports, and the 4 reference signal ports can be denoted as port #1 to port #4. The different filling patterns in the figure represent different reference signal ports. Wherein, port #1 may correspond to the angle delay pair (a ₁ , b ₁ ), which is carried on RB#1, RB#5, RB#9, RB#13, and RB#17 of the 18 RBs in the figure. Port #2 can correspond to the angle delay pair (a ₂ , b ₂ ), and is carried on RB#2, RB#6, RB#10, RB#14, and RB#18 of the 18 RBs in the figure. Port #3 can correspond to the angle delay pair (a ₃ , b ₃ ), and is carried on RB#3, RB#7, RB#11, and RB#15 among the 18 RBs in the figure. Port #4 can correspond to the angle delay pair (a ₄ , b ₄ ), and is carried on RB#4, RB#8, RB#12, and RB#16 of the 18 RBs in the figure. It can be seen that the minimum interval between RBs corresponding to each reference signal port in FIG. 9 is 3 RBs.

Since each reference signal port corresponds to an angle delay pair, the precoding of the precoding reference signal corresponding to each reference signal port may be determined by an angle delay pair. Specifically, the precoding of the precoding reference signal corresponding to each reference signal port may include a spatial weight vector and a frequency domain weight vector. Wherein, each spatial domain weight vector is an angle vector in K angle delay pairs, and each frequency domain weight vector is determined by a delay vector in K angle delay pairs.

Assuming that K reference signal ports have a one-to-one correspondence with K angle delay pairs, the spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the first of the K angle delay pairs. k angle vectors. The frequency domain weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is determined by the k-th delay vector in the K angle delay pairs.

In one possible design, each delay vector is a vector of length N. Each delay vector includes N weights. The frequency domain weight of the precoding of the k-th reference signal port on the n-th RB among the N RBs is the n-th weight in the k-th delay vector.

To avoid confusion, (a) in FIG. 9 shows an _{example of loading angle vectors a 1} to a ₄ on each RB, and (b) in FIG. 9 shows loading _{delay vectors b 1} to b ₄ To the examples on each RB.

Looking at (a) in Figure 9 first, the RBs corresponding to each angle vector are evenly distributed in 18 RBs at intervals of 3 RBs. Each angle vector is used as a spatial weight vector and loaded onto the corresponding RB of the pair.

Looking at (b) in Figure 9, the RBs corresponding to each delay vector are also evenly distributed in 18 RBs at intervals of 3 RBs. Each delay vector can be used to determine a frequency domain weight vector. As shown in the figure, _{the first, fifth, ninth, thirteenth, and seventeenth weights in the delay vector b 1} can be used to form a frequency domain weight vector, of which 5 weights It is loaded on RB#1, RB#5, RB#9, RB#13, and RB#17 respectively. The second, sixth, tenth, fourteenth, and eighteenth weights in the delay vector b ₂ can be used to form a frequency domain weight vector, and the five weights are loaded in RB#. 2. On RB#6, RB#10, RB#14, RB#18. The third, seventh, eleventh, and fifteenth weights in the delay vector b ₃ can be used to form a frequency domain weight vector, and the four weights are loaded on RB#3 and RB# respectively. 7. On RB#11, RB#15. The 4th, 8th, 12th, and 16th weights in b ₄ in the delay vector can be used to form a frequency domain weight vector, and the 4 weights are loaded on RB#4 and RB respectively. #8, RB#12, RB#16. It can be seen that the frequency domain weight loaded on each reference signal port is reduced, that is, the length of the frequency domain weight vector is smaller than the length of the delay vector.

In an implementation manner, the network device may reorganize based on the frequency domain weight matrix F constructed by the above K delay vectors to obtain a new frequency domain weight matrix

Then based on the frequency domain weight matrix obtained by recombination

Perform frequency domain precoding on the reference signal. Network equipment based on matrix F recombination matrix

For the specific implementation manner of, please refer to the related description in the above method 400, for the sake of brevity, it will not be repeated here.

Understandably, the new frequency domain weight matrix

Compared with each frequency domain weight vector in the frequency domain weight matrix F, the length of each frequency domain weight vector in F is reduced.

It should be understood that the matrix is reorganized based on matrix F

In addition, although not shown in the figure, those skilled in the art can understand that the RB may also include more REs for carrying reference signals to carry precoding reference signals of more reference signal ports.

For ease of understanding, the process of loading an angle delay pair corresponding to each reference signal port to the reference signal in the embodiment of the present application is described in conjunction with specific examples. However, these examples are only shown for ease of understanding. The above-listed spatial domain weight vectors, the corresponding relationship between each frequency domain weight and each reference signal port, each RB, and the corresponding relationship shown in order to facilitate understanding The formulas are just examples. Based on the same concept, those skilled in the art can make various possible mathematical transformations or equivalent substitutions to the above formulas. These mathematical transformations or equivalent substitutions should fall within the scope of protection of this application.

This embodiment is also applicable to the case where the pilot density is not 1. For example, the pilot density is 0.5 and so on. Because its specific implementation process is similar to that shown in Figure 9 above. Based on the above description in conjunction with FIG. 6 and FIG. 9, those skilled in the art can easily think of each spatial weight vector, each frequency domain weight, each reference signal port, and each RB when the pilot density is 0.5. For the sake of brevity, the corresponding relationship between is not described in detail with the accompanying drawings.

In addition, similar to the method 400, in this embodiment, the RBs corresponding to the same angular delay pair (or corresponding to the same reference signal port) are arranged at intervals of Q/D-1 RBs. . The network device can configure the value of Q and/or D so that the value of Q/D is an integer.

It should also be understood that the process of precoding the reference signals of the multiple reference signal ports by the network device may refer to the specific description above, and for the sake of brevity, it will not be repeated here. It can be understood that the same RB may correspond to multiple reference signal ports, and is used to carry reference signals of multiple reference signal ports. The multiple reference signal ports may multiplex the resources of the N RBs by means of FDD, TDD, CDD, etc., for example. This application does not limit this.

In step 820, the network device transmits a precoding reference signal. Correspondingly, in step 820, the terminal device receives the precoding reference signal.

It can be understood that the network device sends the reference signals of K reference signal ports, and the terminal device can receive the reference signals of K reference signal ports.

In step 830, the terminal device generates first indication information, where the first indication information is used to indicate K weighting coefficients corresponding to K angle delay pairs.

The terminal device may perform channel estimation based on the precoding reference signal received in step 420 to obtain a channel estimation value corresponding to each reference signal port on each RB. In the embodiment of the present application, each reference signal port corresponds to an angle delay pair, and the terminal device can determine a weighting coefficient based on the precoding reference signal of each reference signal port. Corresponding to K reference signal ports, a total of K weighting coefficients can be determined.

When determining the K weighting coefficients, the terminal device needs to determine in advance which RBs are loaded on the angle delay pair corresponding to each reference signal port, that is, it needs to know the interval between the RBs loaded by each angle delay pair . Therefore, the terminal device needs to know the D value, Q value and K value in advance.

Wherein, the pilot density D and the number of reference signal ports K can be indicated through existing signaling, for example, through configuration signaling of reference signal resources.

For the specific indication manner of the Q value, please refer to the relevant description in step 430 of the method 400 above. For brevity, it will not be repeated here.

Of course, the network device may also indicate the value of one or more of D, K, and Q through an additional signaling. This application is not limited to this.

After determining the D value, K value, and Q value, the terminal device can determine the above K weighting coefficients. In this embodiment, each of the K weighting coefficients may be determined by the precoding reference signal received on the RBs corresponding to the same angle delay pair among the N RBs, which may be specifically determined by the above corresponding to the same angle delay pair. The channel estimation value on the RB of an angle delay pair is accumulated and summed. As mentioned above, the RB corresponding to each angular delay pair is a part of the RBs in the N RBs, that is, the weighting coefficient corresponding to each angular delay pair is determined by the channel estimation value on the part of the RBs in the N RBs. It is obtained by accumulation and summation, without the need to accumulate and sum the channel estimation values on the N RBs.

The specific method for the terminal device to determine the weighting coefficient corresponding to each angle delay pair is similar to the method in method 400. Taking the example shown in Figure 9 as an example, the terminal equipment is based on the angle delay pair (a ₁ , b ₁ ) received on RB#1, RB#5, RB#9, RB#13, and RB#17. The precoding reference signal is used for channel estimation, and 5 channel estimation values can be obtained, for example:

The cumulative sum of the five channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 1} , b _{1 ).} Therefore, the weighting coefficient c ₁ corresponding to the angle delay pair (a ₁ , b ₁ ) can satisfy:

Among them, the subscript 1 represents the first angle delay pair of K angle delay pairs; the superscript n represents the nth RB, and Γ ₁ represents the RB loaded with the first angle delay pair, for example, Γ ₁ includes RB#1, RB#5, RB#9, RB#13, and RB#17. It can be understood that the weighting coefficient corresponding to the above-mentioned angle delay pair (a ₁ , b ₁ ) is also the weighting coefficient corresponding to the first reference signal port.

Similarly, the terminal equipment performs processing based on the precoding reference signal _{corresponding to the angle delay pair (a 2} , b ₂ ) received on RB#2, RB#6, RB#10, RB#14, and RB#18. For channel estimation, 5 channel estimation values can be obtained, for example:

The cumulative sum of the five channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 2} , b _{2 ).} Therefore, the weighting coefficient c ₂ corresponding to the angle delay pair (a ₂ , b ₂ ) can satisfy:

Among them, the subscript 2 represents the second angle delay pair among the K angle delay pairs; the superscript n represents the nth RB, and Γ ₂ represents the loading of the above second angle delay pair (a ₂ ,b ₂ ) RB, for example, Γ ₂ includes RB#2, RB#6, RB#10, RB#14, and RB#18.

The terminal equipment performs channel estimation on the precoding reference signal _{corresponding to the angle delay pair (a 3} , b ₃ ) received on RB#3, RB#7, RB#12, RB#15, and can obtain 4 channels Estimated values, for example:

The cumulative sum of the four channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 3} , b _{3 ).} Therefore, the weighting coefficient c ₃ corresponding to the angle delay pair (a ₃ , b ₃ ) can satisfy:

Among them, the subscript 3 represents the third angle delay pair among the K angle delay pairs; the superscript n represents the nth RB, and Γ ₃ represents the third angle delay pair (a ₃ ,b ₃ ) RB, for example, Γ ₃ includes RB#3, RB#7, RB#12, and RB#15.

The terminal equipment performs channel estimation on the precoding reference signal _{corresponding to the angle delay pair (a 4} , b ₄ ) received on RB#4, RB#8, RB#12, RB#16, and can obtain 4 channels Estimated values, for example:

The cumulative sum of the four channel estimation values is the weighting coefficient corresponding _{to the angle delay pair (a 4} , b _{4 ).} Therefore, the weighting coefficient c ₄ corresponding to the angle delay pair (a ₄ , b ₄ ) can satisfy:

Among them, the subscript 4 represents the fourth angle delay pair among the K angle delay pairs; the superscript n represents the nth RB, and Γ ₄ represents the fourth angle delay pair (a ₄ ,b ₄ ) RB, for example, Γ ₄ includes RB#4, RB#8, RB#12, and RB#16.

Thus, the terminal device can determine the 4 weighting coefficients corresponding to the above-mentioned 4 angle delay pairs, that is, the weighting coefficients corresponding to the 4 reference signal ports are determined.

Based on the same method described above, the terminal device can traverse the value of k from 1 to K to obtain the weighting coefficient corresponding to each angle delay pair. Therefore, the terminal equipment can determine a total of K weighting coefficients. If the K weighting coefficients are expressed by a K×K-dimensional diagonal matrix, they can be expressed as a coefficient matrix C as follows:

_{C k} in the coefficient matrix C may represent the weighting coefficient corresponding to the k-th angle-delay pair in the K angle-delay pairs, or the weighting coefficient corresponding to the k-th reference signal port among the K reference signal ports coefficient.

The terminal device may sequentially report the K weighting coefficients corresponding to the K angle delay pairs in the order of the K angle delay pairs pre-arranged with the network device. Therefore, the terminal device may generate the first indication information in the order of the K angle delay pairs in step 830 to indicate the K weighting coefficients, and in step 840, send the first indication information.

In an implementation manner, the terminal device may perform normalization processing on the K weighting coefficients, and quantize and report the result of the normalization processing. Since the normalization process is described in detail in step 430 of the method 400 above, for the sake of brevity, it will not be repeated here.

In step 840, the terminal device sends the first indication information. Correspondingly, the network device receives the first indication information.

In step 850, the network device determines the precoding matrix corresponding to each frequency domain unit according to the first indication information.

It should be understood that the specific process of step 840 and step 850 can be referred to the related description of step 440 and step 450 in the method 400 above, and for the sake of brevity, it will not be repeated here.

It should be noted that the precoding matrix determined by the channel measurement method provided in the foregoing embodiment of the application may be a precoding matrix directly used for downlink data transmission; it may also undergo some beamforming methods, such as zero forcing (zero forcing, ZF), minimum mean-squared error (MMSE), maximum signal-to-leakage-and-noise (SLNR), etc., to obtain the final precoding matrix for downlink data transmission. This application does not limit this. The precoding matrices involved in the embodiments of this application may all refer to a precoding matrix determined based on the channel measurement method provided in this application.

It should be understood that, in the above embodiments, the terminal device and/or the network device may perform part or all of the steps in the embodiments. These steps or operations are only examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, each step may be performed in a different order presented in each embodiment, and it may not be necessary to perform all operations in the embodiments of the present application. Moreover, the size of the sequence number of each step does not mean the order of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Above, the channel measurement method provided by the embodiment of the present application has been described in detail with reference to FIG. 4 to FIG. 9. Hereinafter, the communication device provided by the embodiment of the present application will be described in detail with reference to FIG. 10 to FIG. 13.

FIG. 10 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown in FIG. 10, the communication device 1000 may include a processing unit 1100 and a transceiving unit 1200.

Optionally, the communication device 1000 may correspond to the terminal device in the above method embodiment, for example, it may be a terminal device, or a component (such as a circuit, a chip, or a chip system, etc.) configured in the terminal device.

It should be understood that the communication device 1000 may correspond to the terminal device in the method 400 or the method 800 according to an embodiment of the present application, and the communication device 1000 may include a terminal device for executing the method 400 in FIG. 4 or the method 800 in FIG. The unit of the method performed by the device. In addition, each unit in the communication device 1000 and other operations and/or functions described above are used to implement the corresponding process of the method 400 in FIG. 4 or the method 800 in FIG. 8, respectively.

Wherein, when the communication device 1000 is used to execute the method 400 in FIG. 4, the processing unit 1100 can be used to execute step 430 in the method 400, and the transceiver unit 1200 can be used to execute step 420 and step 440 in the method 400. It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.

When the communication device 1000 is used to perform the method 800 in FIG. 8, the processing unit 1100 may be used to perform step 830 in the method 800, and the transceiver unit 1200 may be used to perform step 820 and step 840 in the method 800. It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.

It should also be understood that when the communication device 1000 is a terminal device, the transceiver unit 1200 in the communication device 1000 may be implemented by a transceiver, for example, it may correspond to the transceiver 2020 in the communication device 2000 shown in FIG. 11 or the transceiver 2020 in FIG. The transceiver 3020 in the terminal device 3000 shown, the processing unit 1100 in the communication device 1000 may be implemented by at least one processor, for example, may correspond to the processor 2010 in the communication device 2000 shown in FIG. 11 or FIG. 12 The processor 3010 in the terminal device 3000 shown in.

It should also be understood that when the communication device 1000 is a chip or a chip system configured in a terminal device, the transceiver unit 1200 in the communication device 1000 can be implemented through input/output interfaces, circuits, etc., and the processing unit 1100 in the communication device 1000 It can be implemented by a processor, microprocessor, or integrated circuit integrated on the chip or chip system.

Optionally, the communication device 1000 may correspond to the network device in the above method embodiment, for example, it may be a network device, or a component (such as a circuit, a chip, or a chip system, etc.) configured in the network device.

It should be understood that the communication device 1000 may correspond to the network device in the method 400 or the method 800 according to the embodiment of the present application, and the communication device 1000 may include a network device for executing the method 400 in FIG. 4 or the method 800 in FIG. The unit of the method performed by the device. In addition, each unit in the communication device 1000 and other operations and/or functions described above are used to implement the corresponding process of the method 400 in FIG. 4 or the method 800 in FIG. 8, respectively.

Wherein, when the communication device 1000 is used to execute the method 400 in FIG. 4, the processing unit 1100 can be used to execute steps 410 and 450 in the method 400, and the transceiver unit 1200 can be used to execute steps 420 and 440 in the method 400. It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.

When the communication device 1000 is used to execute the method 800 in FIG. 8, the processing unit 1100 can be used to execute step 810 and step 850 in the method 800, and the transceiver unit 1200 can be used to execute step 820 and step 840 in the method 800. It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.

It should also be understood that when the communication device 1000 is a network device, the transceiver unit 1200 in the communication device 1000 may be implemented by a transceiver, for example, it may correspond to the transceiver 2020 in the communication device 2000 shown in FIG. 11 or the transceiver 2020 in FIG. 13 In the shown RRU 4100 in the network device 4000, the processing unit 1100 in the communication device 1000 may be implemented by at least one processor, for example, may correspond to the processor 2010 in the communication device 2000 shown in FIG. 11 or in FIG. 13 The processing unit 4200 or the processor 4202 in the network device 4000 is shown.

It should also be understood that when the communication device 1000 is a chip or a chip system configured in a network device, the transceiver unit 1200 in the communication device 1000 can be implemented through input/output interfaces, circuits, etc., and the processing unit 1100 in the communication device 1000 It can be implemented by a processor, microprocessor, or integrated circuit integrated on the chip or chip system.

FIG. 11 is another schematic block diagram of a communication device 2000 provided by an embodiment of the present application. As shown in FIG. 6, the communication device 2000 includes a processor 2010, a transceiver 2020, and a memory 2030. The processor 2010, the transceiver 2020, and the memory 2030 communicate with each other through an internal connection path. The memory 2030 is used to store instructions, and the processor 2010 is used to execute the instructions stored in the memory 2030 to control the transceiver 2020 to send signals and / Or receive the signal.

It should be understood that the communication apparatus 2000 may correspond to the terminal device in the foregoing method embodiment, and may be used to execute various steps and/or processes performed by the network device or terminal device in the foregoing method embodiment. Optionally, the memory 2030 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A part of the memory may also include a non-volatile random access memory. The memory 2030 may be a separate device or integrated in the processor 2010. The processor 2010 may be used to execute instructions stored in the memory 2030, and when the processor 2010 executes the instructions stored in the memory, the processor 2010 is used to execute each of the above method embodiments corresponding to the network device or the terminal device. Steps and/or processes.

Optionally, the communication device 2000 is the terminal device in the foregoing embodiment.

Optionally, the communication device 2000 is the network device in the foregoing embodiment.

Among them, the transceiver 2020 may include a transmitter and a receiver. The transceiver 2020 may further include an antenna, and the number of antennas may be one or more. The processor 2010, the memory 2030, and the transceiver 2020 may be devices integrated on different chips. For example, the processor 2010 and the memory 2030 may be integrated in a baseband chip, and the transceiver 2020 may be integrated in a radio frequency chip. The processor 2010, the memory 2030, and the transceiver 2020 may also be devices integrated on the same chip. This application does not limit this.

Optionally, the communication device 2000 is a component configured in a terminal device, such as a circuit, a chip, a chip system, and so on.

Optionally, the communication device 2000 is a component configured in a network device, such as a circuit, a chip, a chip system, and the like.

Among them, the transceiver 2020 may also be a communication interface, such as an input/output interface, a circuit, and so on. The transceiver 2020, the processor 2010 and the memory 2020 may be integrated in the same chip, such as integrated in a baseband chip.

FIG. 12 is a schematic structural diagram of a terminal device 3000 provided by an embodiment of the present application. The terminal device 3000 can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiment. As shown in the figure, the terminal device 3000 includes a processor 3010 and a transceiver 3020. Optionally, the terminal device 3000 further includes a memory 3030. Among them, the processor 3010, the transceiver 3020, and the memory 3030 can communicate with each other through an internal connection path to transfer control and/or data signals. The memory 3030 is used to store computer programs, and the processor 3010 is used to download from the memory 3030. Call and run the computer program to control the transceiver 3020 to send and receive signals. Optionally, the terminal device 3000 may further include an antenna 3040 for transmitting the uplink data or uplink control signaling output by the transceiver 3020 through a wireless signal.

The aforementioned processor 3010 and the memory 3030 can be combined into a processing device, and the processor 3010 is configured to execute the program code stored in the memory 3030 to realize the aforementioned functions. During specific implementation, the memory 3030 may also be integrated in the processor 3010 or independent of the processor 3010. The processor 3010 may correspond to the processing unit 1100 in FIG. 10 or the processor 2010 in FIG. 11.

The aforementioned transceiver 3020 may correspond to the transceiver unit 1200 in FIG. 10 or the transceiver 2020 in FIG. 11. The transceiver 3020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.

It should be understood that the terminal device 3000 shown in FIG. 12 can implement various processes involving the terminal device in the method embodiment shown in FIG. 4 or FIG. 8. The operations and/or functions of each module in the terminal device 3000 are respectively for implementing the corresponding processes in the foregoing method embodiments. For details, please refer to the description in the foregoing method embodiment, and to avoid repetition, detailed description is omitted here as appropriate.

The above-mentioned processor 3010 can be used to execute the actions described in the previous method embodiments implemented by the terminal device, and the transceiver 3020 can be used to execute the terminal device described in the previous method embodiments to send to or receive from the network device. action. For details, please refer to the description in the previous method embodiment, which will not be repeated here.

Optionally, the aforementioned terminal device 3000 may further include a power supply 3050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the function of the terminal device more complete, the terminal device 3000 may also include one or more of the input unit 3060, the display unit 3070, the audio circuit 3080, the camera 3090, and the sensor 3100. The audio circuit It may also include a speaker 3082, a microphone 3084, and so on.

FIG. 13 is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, it may be a schematic structural diagram of a base station. The base station 4000 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiment. As shown in the figure, the base station 4000 may include one or more radio frequency units, such as a remote radio unit (RRU) 4100 and one or more baseband units (BBU) (also known as distributed unit (DU) )) 4200. The RRU 4100 may be called a transceiver unit, and may correspond to the transceiver unit 1200 in FIG. 10 or the transceiver 2020 in FIG. 11. Optionally, the RRU 4100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 4101 and a radio frequency unit 4102. Optionally, the RRU 4100 may include a receiving unit and a sending unit. The receiving unit may correspond to a receiver (or receiver or receiving circuit), and the sending unit may correspond to a transmitter (or transmitter or transmitting circuit). The RRU 4100 part is mainly used for receiving and sending radio frequency signals and conversion between radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment. The 4200 part of the BBU is mainly used for baseband processing, base station control, and so on. The RRU 4100 and the BBU 4200 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 4200 is the control center of the base station, and can also be called a processing unit, which can correspond to the processing unit 1100 in FIG. 10 or the processor 2010 in FIG. 11, and is mainly used to complete baseband processing functions such as channel coding and multiplexing. , Modulation, spread spectrum and so on. For example, the BBU (processing unit) may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 4200 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access standard (such as an LTE network), or support different access standards. Wireless access network (such as LTE network, 5G network or other networks). The BBU 4200 further includes a memory 4201 and a processor 4202. The memory 4201 is used to store necessary instructions and data. The processor 4202 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment. The memory 4201 and the processor 4202 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

It should be understood that the base station 4000 shown in FIG. 13 can implement various processes involving network devices in the method embodiment shown in FIG. 4 or FIG. 8. The operations and/or functions of the various modules in the base station 4000 are to implement the corresponding procedures in the foregoing method embodiments. For details, please refer to the description in the foregoing method embodiment, and to avoid repetition, detailed description is omitted here as appropriate.

The above-mentioned BBU 4200 can be used to perform the actions described in the previous method embodiments implemented by the network device, and the RRU 4100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device. For details, please refer to the description in the previous method embodiment, which will not be repeated here.

It should be understood that the base station 4000 shown in FIG. 13 is only a possible form of network equipment, and should not constitute any limitation to this application. The method provided in this application can be applied to other types of network equipment. For example, it may include AAU, it may also include CU and/or DU, or it may include BBU and adaptive radio unit (ARU), or BBU; it may also be customer premises equipment (CPE), or it may be For other forms, this application does not limit the specific form of the network device.

Among them, the CU and/or DU can be used to perform the actions described in the previous method embodiment implemented by the network device, and the AAU can be used to perform the network device described in the previous method embodiment to send to or receive from the terminal device Actions. For details, please refer to the description in the previous method embodiment, which will not be repeated here.

The present application also provides a processing device including at least one processor, and the at least one processor is configured to execute a computer program stored in a memory, so that the processing device executes the terminal device or the network device in any of the foregoing method embodiments The method performed.

It should be understood that the aforementioned processing device may be one or more chips. 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 It is a central processor unit (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or it can be a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.

The embodiment of the present application also provides a processing device, including a processor and a communication interface. The communication interface is coupled with the processor. The communication interface is used to input and/or output information. The information includes at least one of instructions and data. The processor is used to execute a computer program, so that the processing apparatus executes the method executed by the terminal device or the network device in any of the foregoing method embodiments.

An embodiment of the present application also provides a processing device, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the processing device executes the method executed by the terminal device or the network device in any of the foregoing method embodiments.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components . The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), and synchronous dynamic random access memory (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 connection 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 memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

According to the method provided in the embodiments 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 runs on a computer, the computer executes the steps shown in FIG. 4 or FIG. 8 The method executed by the terminal device or the method executed by the network device in the embodiment is shown.

According to the method provided in the embodiments of the present application, the present application also provides a computer-readable storage medium that stores program code, and when the program code runs on a computer, the computer executes FIG. 4 or FIG. The method executed by the terminal device or the method executed by the network device in the embodiment shown in 8.

According to the method provided in the embodiment of the present application, the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

The network equipment in each of the above-mentioned device embodiments corresponds completely to the network equipment or terminal equipment in the terminal equipment and method embodiments, and the corresponding modules or units execute the corresponding steps. For example, the communication unit (transceiver) executes the receiving or the terminal equipment in the method embodiments. In the sending step, other steps except sending and receiving can be executed by the processing unit (processor). For the functions of specific units, refer to the corresponding method embodiments. Among them, there may be one or more processors.

In the foregoing embodiment, the terminal device may be used as an example of the receiving device, and the network device may be used as an example of the sending device. But this should not constitute any limitation to this application. For example, the sending device and the receiving device may both be terminal devices and the like. This application does not limit the specific types of sending equipment and receiving equipment.

The terms "component", "module", "system", etc. used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, the component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, and/or a computer running on a processor. Through the illustration, both the application running on the computing device and the computing device can be components. One or more components may reside in processes and/or threads of execution, and components may be located on one computer and/or distributed among two or more computers. In addition, these components can be executed from various computer readable media having various data structures stored thereon. The component can be based on, for example, a signal having one or more data packets (e.g. data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through a signal) Communicate through local and/or remote processes.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, 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 the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A channel measurement method, characterized in that it comprises:

Generate first indication information, the first indication information is determined based on the received precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and among the K angle delay pairs Each angle delay pair includes an angle vector and a delay vector; the first indication information is used to indicate K weighting coefficients corresponding to the K angle delay pairs, the K angle delay pairs and The corresponding K weighting coefficients are used to construct a precoding matrix; each weighting coefficient of the K weighting coefficients is determined based on the precoding reference signal carried on part of the N frequency domain units; where , N is the number of frequency domain units included in the pilot transmission bandwidth, K and N are both integers greater than 1;

Sending the first instruction information.
The method according to claim 1, wherein each of the K weighting coefficients is determined by a precoding reference signal received on at least one of the N frequency domain units , The at least one frequency domain unit is part of the N frequency domain units, and any two frequency domain units in the at least one frequency domain unit are separated by at least Q/D-1 frequency Domain unit; Q is an integer greater than 1, Q<K; D is the pilot density, 0<D≤1; Q/D is an integer.
The method according to claim 2, wherein each of the K weighting coefficients is based on at least one estimated value determined based on the precoding reference signal received on the at least one frequency domain unit Each of the at least one estimated value is obtained by performing channel estimation based on a precoding reference signal received on one of the at least one frequency domain unit.
The method according to claim 2 or 3, wherein the precoding reference signal corresponds to P reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port includes spatial weights and frequency domains. The weight value, the precoding of the precoding reference signal corresponding to each reference signal port is determined by the Q angle delay pairs among the K angle delay pairs; P<K, and P is a positive integer.
The method according to claim 4, wherein the Q angle vectors included in the Q angle delay pairs are Q airspace weight vectors, and each airspace weight in the Q airspace weight vectors The vector includes multiple spatial weights; the Q spatial weight vectors are used to alternately precode the reference signals carried on the N frequency domain units;

The Q delay vectors included in the Q angle delay pairs are used to determine N frequency domain weights, and the N frequency domain weights correspond to the N frequency domain units for the The reference signals on the N frequency domain units are pre-encoded.
The method according to claim 4 or 5, wherein the method further comprises:

Receiving second indication information, where the second indication information is used to indicate a reporting rule for the K weighting coefficients.
The method according to claim 6, wherein the coefficients c p, q in the K weighting coefficients correspond to the p-th reference signal port among the P reference signal ports, and the p-th reference signal port is different from the p-th reference signal port. The qth angle delay pair of the Q angle delay pairs corresponding to the reference signal port, 1≤p≤P, 1≤q≤Q, all integers;

The reporting rules include: sequentially taking values from 1 to P to p, for each value of p, reporting the corresponding Q coefficients; or, taking values from 1 to Q to q in turn, and taking values for each q Value, P coefficients corresponding to the report.
The method according to claim 2 or 3, wherein the precoding reference signal corresponds to K reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port is determined by the K angles. One of the extensions is confirmed.
8. The method according to claim 8, wherein the precoding of the precoding reference signal corresponding to each of the K reference signal ports comprises a spatial domain weight vector and a frequency domain weight vector; The spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the angle vector of the k-th angle-delay pair in the K-th angle-delay pair, and the The frequency domain weight vector corresponding to the k reference signal ports is determined by the delay vector of the k-th angle delay pair.
The method according to any one of claims 2 to 9, wherein the method further comprises:

Receive third indication information, where the third indication information is used to indicate the value of Q.
The method according to any one of claims 2 to 9, wherein the value of Q is a predefined value.
A channel measurement method, characterized in that it comprises:

Receive first indication information, where the first indication information is determined based on a precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and each angle of the K angle delay pairs The delay pair includes an angle vector and a delay vector; the first indication information is used to indicate K weighting coefficients corresponding to the K angle delay pairs, the K angle delay pairs and their corresponding The K weighting coefficients are used to construct a precoding matrix; each weighting coefficient of the K weighting coefficients is determined based on the precoding reference signal carried on some of the N frequency domain units; where N is The number of frequency domain units included in the pilot transmission bandwidth, K and N are both integers greater than 1;

The precoding matrix corresponding to each frequency domain unit is determined based on the first indication information.
The method of claim 12, wherein each of the K weighting coefficients is determined by a precoding reference signal received on at least one of the N frequency domain units , The at least one frequency domain unit is part of the N frequency domain units, and any two frequency domain units in the at least one frequency domain unit are separated by at least Q/D-1 frequency Domain unit; Q is an integer greater than 1, Q<K; D is the pilot density, 0<D≤1; Q/D is an integer.
The method according to claim 13, wherein the precoding reference signal corresponds to P reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port includes spatial domain weights and frequency domain weights , The precoding of the precoding reference signal corresponding to each reference signal port is determined by the Q angle delay pairs among the K angle delay pairs; P<K, and P is a positive integer.
The method according to claim 14, wherein the Q angle vectors contained in the Q angle delay pairs are Q airspace weight vectors, and each airspace weight in the Q airspace weight vectors The vector includes multiple spatial weights; the Q spatial weight vectors are used to alternately precode the reference signals carried on the N frequency domain units;

The Q delay vectors included in the Q angle delay pairs are used to determine N frequency domain weights, and the N frequency domain weights correspond to the N frequency domain units for the The reference signals on the N frequency domain units are pre-encoded.
The method according to claim 14 or 15, wherein the method further comprises:

Sending second indication information, where the second indication information is used to indicate a reporting rule for the K weighting coefficients.
The method according to claim 16, wherein the coefficients c p, q in the K weighting coefficients correspond to the p-th reference signal port among the P reference signal ports, and the p-th reference signal port is the same as the p-th reference signal port. The qth angle delay pair of the Q angle delay pairs corresponding to the reference signal port, 1≤p≤P, 1≤q≤Q, all integers;

The reporting rules include: sequentially taking values from 1 to P to p, and for each value of p, reporting the corresponding Q coefficients; or, taking values from 1 to Q to q in turn, and taking values for each q Value, P coefficients corresponding to the report.
The method according to claim 13, wherein the precoding reference signal corresponds to K reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port is determined by the K angle delay pair One of them is ok.
The method according to claim 18, wherein the precoding of the precoding reference signal corresponding to each of the K reference signal ports includes a spatial domain weight vector and a frequency domain weight vector; The spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the angle vector of the k-th angle-delay pair in the K-th angle-delay pair, and the The frequency domain weight vector corresponding to the k reference signal ports is determined by the delay vector of the k-th angle delay pair.
The method according to any one of claims 13 to 19, wherein the method further comprises:

Send third indication information, where the third indication information is used to indicate the value of Q.
The method according to any one of claims 13 to 19, wherein the value of Q is a predefined value.
A communication device, characterized in that it comprises:

The processing unit is configured to generate first indication information, the first indication information being determined based on the received precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and the K angles Each angle delay pair in the delay pair includes an angle vector and a delay vector; the first indication information is used to indicate K weighting coefficients corresponding to the K angle delay pairs, and the K The angle delay pair and the corresponding K weighting coefficients are used to construct a precoding matrix; each of the K weighting coefficients is based on the precoding carried on part of the N frequency domain units Reference signal determination; where N is the number of frequency domain units included in the pilot transmission bandwidth, and both K and N are integers greater than 1;

The transceiver unit is configured to send the first indication information.
The apparatus according to claim 22, wherein each of the K weighting coefficients is determined by a precoding reference signal received on at least one of the N frequency domain units , The at least one frequency domain unit is part of the N frequency domain units, and any two frequency domain units in the at least one frequency domain unit are separated by at least Q/D-1 frequency Domain unit; Q is an integer greater than 1, Q<K; D is the pilot density, 0<D≤1; Q/D is an integer.
The apparatus of claim 23, wherein each of the K weighting coefficients is based on at least one estimated value determined based on a precoding reference signal received on the at least one frequency domain unit Each of the at least one estimated value is obtained by performing channel estimation based on a precoding reference signal received on one of the at least one frequency domain unit.
The apparatus according to claim 23 or 24, wherein the precoding reference signal corresponds to P reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port includes spatial weights and frequency domains. The weight value, the precoding of the precoding reference signal corresponding to each reference signal port is determined by the Q angle delay pairs among the K angle delay pairs; P<K, and P is a positive integer.
The device of claim 25, wherein the Q angle vectors included in the Q angle delay pairs are Q airspace weight vectors, and each airspace weight in the Q airspace weight vectors The vector includes multiple spatial weights; the Q spatial weight vectors are used to alternately precode the reference signals carried on the N frequency domain units;

The Q delay vectors included in the Q angle delay pairs are used to determine N frequency domain weights, and the N frequency domain weights correspond to the N frequency domain units for the The reference signals on the N frequency domain units are pre-encoded.
The apparatus according to claim 25 or 26, wherein the transceiver unit is further configured to receive second indication information, and the second indication information is used to indicate a reporting rule for the K weighting coefficients.
The apparatus according to claim 27, wherein the coefficients c p and q in the K weighting coefficients correspond to the p-th reference signal port among the P reference signal ports, and the p-th reference signal port is the same as the p-th reference signal port. The qth angle delay pair of the Q angle delay pairs corresponding to the reference signal port, 1≤p≤P, 1≤q≤Q, all integers;

The reporting rules include: sequentially taking values from 1 to P to p, for each value of p, reporting the corresponding Q coefficients; or, taking values from 1 to Q to q in turn, and taking values for each q Value, P coefficients corresponding to the report.
The apparatus according to claim 23 or 24, wherein the precoding reference signal corresponds to K reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port is determined by the K angles. One of the extensions is confirmed.
The apparatus according to claim 29, wherein the precoding of the precoding reference signal corresponding to each of the K reference signal ports includes a spatial domain weight vector and a frequency domain weight vector; The spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the angle vector of the k-th angle-delay pair in the K-th angle-delay pair, and the The frequency domain weight vector corresponding to the k reference signal ports is determined by the delay vector of the k-th angle delay pair.
The apparatus according to any one of claims 23 to 30, wherein the transceiver unit is further configured to receive third indication information, and the third indication information is used to indicate the value of Q.
The device according to any one of claims 23 to 30, wherein the value of Q is a predefined value.
The device according to any one of claims 22 to 32, wherein the processing unit is a processor, and the transceiving unit is a transceiver.
The device according to any one of claims 22 to 33, wherein the device is a terminal device.
A communication device, characterized in that it comprises:

The transceiver unit is configured to receive first indication information, the first indication information being determined based on a precoding reference signal, the precoding of the precoding reference signal is determined by K angle delay pairs, and the K angle delay pairs Each angle delay pair in includes an angle vector and a delay vector; the first indication information is used to indicate K weighting coefficients corresponding to the K angle delay pairs, and the K angle delay pairs The K weighting coefficients and the corresponding K weighting coefficients are used to construct a precoding matrix; each weighting coefficient of the K weighting coefficients is determined based on the precoding reference signal carried on part of the N frequency domain units ; Among them, N is the number of frequency domain units included in the pilot transmission bandwidth, and both K and N are integers greater than 1;

The processing unit is configured to determine a precoding matrix corresponding to each frequency domain unit based on the first indication information.
The apparatus according to claim 35, wherein each of the K weighting coefficients is determined by a precoding reference signal received on at least one of the N frequency domain units , The at least one frequency domain unit is part of the N frequency domain units, and any two frequency domain units in the at least one frequency domain unit are separated by at least Q/D-1 frequency Domain unit; Q is an integer greater than 1, Q<K; D is the pilot density, 0<D≤1; Q/D is an integer.
The apparatus according to claim 36, wherein the precoding reference signal corresponds to P reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port includes a spatial domain weight and a frequency domain weight , The precoding of the precoding reference signal corresponding to each reference signal port is determined by the Q angle delay pairs among the K angle delay pairs; P<K, and P is a positive integer.
The device of claim 37, wherein the Q angle vectors included in the Q angle delay pairs are Q airspace weight vectors, and each airspace weight in the Q airspace weight vectors The vector includes multiple spatial weights; the Q spatial weight vectors are used to alternately precode the reference signals carried on the N frequency domain units;

The Q delay vectors included in the Q angle delay pairs are used to determine N frequency domain weights, and the N frequency domain weights correspond to the N frequency domain units for the The reference signals on the N frequency domain units are pre-encoded.
The apparatus according to claim 37 or 38, wherein the transceiver unit is further configured to send second indication information, and the second indication information is used to indicate a reporting rule for the K weighting coefficients.
The apparatus according to claim 39, wherein the coefficients c p, q in the K weighting coefficients correspond to the p-th reference signal port among the P reference signal ports, and the p-th reference signal port is different from the p-th reference signal port. The qth angle delay pair of the Q angle delay pairs corresponding to the reference signal port, 1≤p≤P, 1≤q≤Q, all integers;

The reporting rules include: sequentially taking values from 1 to P to p, for each value of p, reporting the corresponding Q coefficients; or, taking values from 1 to Q to q in turn, and taking values for each q Value, P coefficients corresponding to the report.
The apparatus according to claim 36, wherein the precoding reference signal corresponds to K reference signal ports, and the precoding of the precoding reference signal corresponding to each reference signal port is determined by the K angle delay pair One of them is ok.
The apparatus according to claim 41, wherein the precoding of the precoding reference signal corresponding to each of the K reference signal ports comprises a spatial domain weight vector and a frequency domain weight vector; The spatial weight vector in the precoding corresponding to the k-th reference signal port among the K reference signal ports is the angle vector of the k-th angle-delay pair in the K-th angle-delay pair, and the The frequency domain weight vector corresponding to the k reference signal ports is determined by the delay vector of the k-th angle delay pair.
The device according to any one of claims 36 to 42, wherein the transceiver unit is further configured to send third indication information, and the third indication information is used to indicate the value of Q.
The device according to any one of claims 36 to 42, wherein the value of Q is a predefined value.
The device according to any one of claims 35 to 44, wherein the processing unit is a processor, and the transceiving unit is a transceiver.
The device according to any one of claims 35 to 45, wherein the device is a network device.
A processing device, characterized by comprising at least one processor configured to execute a computer program stored in a memory, so that the device implements the method according to any one of claims 1 to 11 .
A processing device, characterized by comprising at least one processor configured to execute a computer program stored in a memory, so that the device implements the method according to any one of claims 12 to 21 .
A processing device, characterized in that it comprises:

Communication interface, used to input and/or output information;

The processor is configured to execute a computer program, so that the device implements the method according to any one of claims 1 to 11.
A processing device, characterized in that it comprises:

Communication interface, used to input and/or output information;

The processor is configured to execute a computer program, so that the device implements the method according to any one of claims 12 to 21.
A processing device, characterized in that it comprises:

Memory, used to store computer programs;

The processor is configured to call and run the computer program from the memory, so that the device implements the method according to any one of claims 1 to 11.
A processing device, characterized in that it comprises:

Memory, used to store computer programs;

The processor is configured to call and run the computer program from the memory, so that the device implements the method according to any one of claims 12 to 21.
A computer-readable storage medium, characterized by comprising a computer program, which when the computer program runs on a computer, causes the computer to execute the method according to any one of claims 1 to 11.
A computer-readable storage medium, characterized by comprising a computer program, which when the computer program runs on a computer, causes the computer to execute the method according to any one of claims 12 to 21.
A computer program product, the computer program product comprising a computer program, when the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 1 to 11.
A computer program product, the computer program product comprising a computer program, when the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 12 to 21.