WO2021134207A1

WO2021134207A1 - Method for indicating and determining channel state information, and communication device

Info

Publication number: WO2021134207A1
Application number: PCT/CN2019/129905
Authority: WO
Inventors: 金黄平; 尚鹏; 刘祥龙; 张碧军; 毕晓艳; 陈大庚
Original assignee: 华为技术有限公司
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

The present application provides a method for indicating and determining channel state information, and a communication device. The method is applicable to a system comprising a transmission apparatus and a receiving apparatus. The transmission apparatus comprises one or more transmission antenna units. Each transmission antenna unit comprises one reference transmission antenna port and at least one non-reference transmission antenna port. The receiving apparatus comprises one or more receiving antenna ports. Each reference transmission antenna port and one receiving antenna port constitute a reference transmission channel. The method comprises: a receiving apparatus generating and transmitting reference channel state information and port difference information, the reference channel state information being acquired on the basis of at least one reference transmission channel, and the port difference information being used to indicate a radiation characteristic difference between the reference transmission antenna port and the non-reference transmission antenna port in each transmission antenna unit; and a network apparatus determining channel state information according to the reference channel state information and the port difference information.

Description

Method and communication device for indicating and determining channel state information

Technical field

This application relates to the field of wireless communication, and more specifically, to a method and communication device for indicating and determining channel state information.

Background technique

In order to obtain a larger system throughput, it is hoped that the antenna's spatial resolution can be maximized through the design of the antenna. Generally speaking, the area of the antenna array determines the spatial resolution of the antenna array. However, the area of the antenna panel is often limited. In order to improve system throughput, consider deploying antenna units that can provide more ports (for example, four ports, or even more ports) in the antenna panel.

However, multiple ports provided by the same antenna unit may have different radiation characteristics. How to perform channel measurement for different radiation characteristics to obtain channel state information is a technical problem to be solved urgently.

Summary of the invention

The present application provides a method and communication device for indicating and determining channel state information, so as to be applicable to a transmitting device including antenna units with multiple transmitting antenna ports with different radiation characteristics.

In the first aspect, a method for indicating channel state information is provided. The method may be executed by, for example, a receiving device, or may also be executed by a component (such as a circuit, a chip, or a chip system, etc.) configured in the receiving device. This application does not limit this.

Specifically, the method can be applied to a system including a sending device and a receiving device. The transmitting device may include one or more transmitting antenna units. Each transmitting antenna unit may include multiple transmitting antenna ports, and the multiple transmitting antenna ports of each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port. The receiving device may include one or more receiving antenna ports. A reference transmitting antenna port and a receiving antenna port can form a reference transmission channel.

The method includes: generating reference channel state information and port difference information, where the reference channel state information is obtained based on at least one reference transmission channel, and the port difference information can be used to indicate the reference transmit antenna port and the non-reference transmit antenna port in each transmit antenna unit The radiation characteristic difference between the two; send the reference channel state information and port difference information.

Among them, the reference transmitting antenna port may be predefined. The reference transmitting antenna port and the non-reference transmitting antenna port are named only for easy distinction, and should not constitute any limitation in this application. Any antenna port in a transmitting antenna unit can be defined as a reference transmitting antenna port. This application does not limit the definition of the reference transmitting antenna port.

In the embodiment of the present application, the reference channel state information may be obtained based on one or more reference transmission channels, or in other words, the reference channel state information may be obtained based on part or all of the reference transmission channels between the sending device and the terminal device. The port difference information may include information corresponding to the multiple transmitting antenna units and used to indicate the radiation characteristic difference between the transmitting antenna ports in the transmitting antenna unit. The port difference information corresponding to the multiple transmitting antenna units may be the same or different, which is not limited in this application.

It should be understood that the receiving device described herein may specifically be a device that receives signals (such as reference signals) sent by the sending device through multiple transmitting antenna units. In one possible design, the receiving device is a terminal device and the sending device is a network device.

In the embodiment of the present application, by defining the reference transmitting antenna port and the non-reference antenna port for the multi-antenna transmitting antenna unit, the receiving device can convert the channel state information into two parts of the reference channel state information and the port difference information to indicate separately. On the one hand, it will not cause excessive instruction overhead, on the other hand, it can also guarantee a certain accuracy. In this way, the transmitting device can determine the channel state information based on the reference channel state information and the port difference information indicated by the receiving device, and then make reasonable decisions for subsequent data transmission, such as determining a precoding matrix adapted to the channel. Therefore, it is beneficial to improve the transmission performance of the communication system.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: receiving instruction information, where the instruction information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.

The number N of transmitting antenna ports of each transmitting antenna unit can be understood as the number of transmitting antenna ports provided by each transmitting antenna unit, or the number of transmitting antenna ports included in each transmitting antenna unit.

In the case that each transmitting antenna unit defines a reference transmitting antenna port, the number of non-reference transmitting antenna ports is related to the number of transmitting antenna ports of each transmitting antenna unit. Therefore, both the port difference information and the reference channel state information are related to the number of transmitting antenna ports.

It should be understood that the indication of the number N of transmitting antenna ports of each transmitting antenna unit by the transmitting device may be a direct indication or an indirect indication. This application does not limit the specific instructions of N.

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

Specifically, the method can be applied to indicate channel state information between the sending device and the receiving device. The transmitting device may include one or more transmitting antenna units. Each transmitting antenna unit may include multiple transmitting antenna ports, and the multiple transmitting antenna ports of each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port. The receiving device may include one or more receiving antenna ports. A reference transmitting antenna port and a receiving antenna port can form a reference transmission channel.

The method includes: receiving reference channel state information and port difference information, the reference channel state information may be used to indicate channel state information obtained based on at least one reference transmission channel, and the port difference information may be used to indicate a reference transmit antenna in each transmit antenna unit The radiation characteristic difference between the port and the non-reference transmitting antenna port; the channel state information is determined according to the reference channel state information and the port difference information.

It should be understood that the receiving device described here may specifically be a device that receives signals (such as reference signals) sent from the sending device through multiple transmitting antenna units. In one possible design, the receiving device is a terminal device and the sending device is a network device.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: sending instruction information, where the instruction information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.

In a third aspect, a communication device is provided. The communication device may be a receiving device or a component in the receiving 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.

Specifically, the communication device can be applied to a system including a receiving device and a transmitting device. The transmitting device may include one or more transmitting antenna units. Each transmitting antenna unit may include multiple transmitting antenna ports, and the multiple transmitting antenna ports of each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port. The receiving device may include one or more receiving antenna ports. A reference transmitting antenna port and a receiving antenna port can form a reference transmission channel. It is understandable that if the communication device is a receiving device, the receiving device described here can be replaced with the communication device.

The communication device may include a processing unit and a transceiving unit. Wherein, the processing unit can be used to generate reference channel state information and port difference information, the reference channel state information is obtained based on at least one reference transmission channel, and the port difference information can be used to indicate whether the reference transmission antenna port in each transmission antenna unit is different from the non-reference transmission. The difference in radiation characteristics between antenna ports; the transceiver unit can be used to send the reference channel state information and port difference information.

With reference to the third aspect, in some implementations of the third aspect, the transceiver unit is further used to receive indication information, and the indication information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.

In a fourth aspect, a communication device is provided. The communication device may be a sending device or a component in the sending 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.

Specifically, the communication device can be applied to a system including a receiving device and a transmitting device. The transmitting device may include one or more transmitting antenna units. Each transmitting antenna unit may include multiple transmitting antenna ports, and the multiple transmitting antenna ports of each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port. The receiving device may include one or more receiving antenna ports. A reference transmitting antenna port and a receiving antenna port can form a reference transmission channel. It is understandable that if the communication device is a sending device, the sending device described here can be replaced with the communication device.

The communication device may include a processing unit and a transceiving unit. Among them, the transceiver unit can be used to receive reference channel state information and port difference information, the reference channel state information is obtained based on at least one reference transmission channel, and the port difference information can be used to indicate the reference transmit antenna port and non-reference transmission in each transmit antenna unit The radiation characteristic difference between the antenna ports; the processing unit can be used to determine the channel state information according to the reference channel state information and the port difference information.

With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver unit is also used to send instruction information, and the instruction information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.

In a fifth aspect, a communication device is provided, including a processor. The processor is coupled with the memory and can be used to execute instructions in the memory to implement the foregoing first aspect and 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, and the processor is coupled with the communication interface.

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

In addition, the communication device may be configured with one or more receiving antenna ports.

In another implementation manner, the communication device is a chip configured in the receiving device. When the communication device is a chip configured in a receiving device, the communication interface may be an input/output interface. In addition, the communication device to which the communication device belongs may be configured with one or more receiving antenna ports.

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

In addition, the communication device equipped with the communication device may be equipped with one or more receiving antenna ports.

In a sixth aspect, a communication device is provided, including a processor. The processor is coupled with the memory, and can be used to execute instructions in the memory to implement the foregoing second aspect and 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, and the processor is coupled with the communication interface.

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

In addition, the communication device may be configured with one or more transmitting antenna units, and each transmitting antenna unit includes a plurality of transmitting antenna ports.

In another implementation manner, the communication device is a chip configured in the sending device. When the communication device is a chip configured in a sending device, the communication interface may be an input/output interface.

In addition, the communication device equipped with the communication device may be configured with one or more transmitting antenna units, and each transmitting antenna unit includes a plurality of transmitting antenna ports.

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 any one of the first aspect to the second aspect and the first aspect to the second aspect. The method in the way.

In the specific implementation process, the above-mentioned processor can be one or more chips, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits, etc. . 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 processor and a memory. The processor is used to read instructions stored in the memory, receive signals through a receiver, and transmit signals through a transmitter to execute any one of the first aspect to the second aspect and any one of the first aspect to the second aspect. In the method.

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 data interaction process, for example, sending instruction information may be a process of outputting instruction information from the processor, and receiving reference channel state information and port difference information may be a process of inputting reference channel state information and port difference information to the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver. Among them, the transmitter and receiver can be collectively referred to as a transceiver.

The processing device in the above eighth aspect may be one or more chips. The processor in the processing device can be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, integrated circuit, etc.; when implemented by software, the processor may be one or more general-purpose processors, which are 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 ninth 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 executed, causes a computer to execute the first aspect to the first aspect above. The method in the second aspect and any one of the possible implementation manners of the first aspect to the second aspect.

In a tenth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program (also called code, or instruction), which when it runs on a computer, causes the computer to execute the above-mentioned The method in any one of the possible implementation manners of the first aspect to the second aspect and the first aspect to the second aspect.

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

In combination with the foregoing aspects, in some possible implementation manners, the receiving device may be a terminal device, and the sending device may be a network device.

In combination with the foregoing aspects, in some possible implementation manners, each transmit antenna unit includes N transmit antenna ports.

Optionally, each transmit antenna unit includes N transmit antenna ports, the port difference information includes an indication of R sets of coefficients corresponding to each of the R transmission layers, and each set of coefficients includes N-1 coefficients , R≥1, N>1, R and N are integers.

The N-1 coefficients can be specifically used to represent the difference in radiation characteristics between the reference transmitting antenna port and the N-1 non-reference transmitting antenna ports in each transmitting antenna unit.

It can be seen that each set of coefficients indicated by the port difference information can correspond to a transport layer. Each set of coefficients can be used to determine the corresponding precoding vector of the transmission layer.

Optionally, each transmit antenna unit includes N transmit antenna ports, and the port difference information includes an indication of N(N-1)/2 coefficients, where N>1 and an integer.

The N(N-1)/2 coefficients are used to express the difference in radiation characteristics between the reference transmitting antenna port and N-1 non-reference transmitting antenna ports in each transmitting antenna unit, and also to express each The radiation characteristic difference between every two non-reference transmitting antenna ports in the N-1 non-reference transmitting antennas in each transmitting antenna unit.

It can be seen that, unlike the N-1 coefficients described above, the N(N-1)/2 coefficients indicated by the port difference information do not correspond to the transmission layer. In fact, the N(N-1)/2 coefficients can be used to determine the covariance matrix of the channel.

It should be understood that the use of coefficients to indicate the difference in port radiation characteristics is only a possible implementation, and should not constitute any limitation in this application.

In combination with the foregoing aspects, in some possible implementation manners, the port difference information of the multiple transmitting antenna units is the same.

As mentioned above, the port difference information corresponding to the multiple transmitting antenna units may be the same or different. Therefore, the radiation characteristic difference between the transmitting antenna ports in each transmitting antenna unit can be represented by the same information, or can be represented by different information. In a possible design, the reference transmitting antenna ports in the multiple transmitting antenna units may have the same or similar (or close) radiation characteristics. For example, the reference transmitting antenna ports in each transmitting antenna unit may be The positions of the transmitting antenna units are the same. In this case, the radiation characteristic difference between the transmitting antenna ports in each transmitting antenna unit may be the same. The indication of the port difference information by the receiving device may only include an indication of the radiation characteristic difference between the transmitting antenna ports in one transmitting antenna unit, or in other words, it may only indicate the radiation characteristic difference between the transmitting antenna ports in one transmitting antenna unit Or, in other words, the radiation characteristic difference between the transmitting antenna ports in each transmitting antenna unit can be indicated by the same port difference information.

In combination with the foregoing aspects, in some possible implementation manners, the reference channel state information is specifically used to indicate R vectors corresponding to R transmission layers, and R is a positive integer.

The reference channel state information may be determined based on the covariance matrices of multiple reference transmission channels. Exemplarily, performing singular value decomposition on the covariance matrices of multiple reference transmission channels may obtain R eigenvectors, and the R eigenvectors may correspond to R transmission layers.

Among them, the receiving device can represent multiple reference transmission channels between the sending device and the receiving device through a reference transmission channel or a mathematical transformation of a reference transmission channel. For example, the difference between two reference transmission channels can be represented by a coefficient. . The receiving device may also separately indicate the channel state information of multiple reference transmission channels between the sending device and the receiving device. This application does not limit this.

Optionally, the rth vector in the R vectors is used to determine the precoding vector corresponding to the rth transmission layer in the R transmission layers, and 1≤r≤R, and r is a positive integer.

The R vectors are combined with the aforementioned port difference information and can be used to determine the precoding vectors respectively corresponding to the R transmission layers. However, it should be understood that the channel state information determined by the transmitting device based on the reference channel state information and the port difference information is not limited to the precoding vector, and may also be a channel, a covariance matrix of the channel, and the like. This application does not limit this.

Optionally, the R vectors are R basis vectors in a predefined basis vector set, and the reference channel state information includes an indication of the R basis vectors in the basis vector set.

That is, the receiving device can indicate the R vectors through port selection.

Optionally, each of the R vectors is a linear superposition sum of one or more base vectors in a predefined set of base vectors, and the reference channel state information includes the corresponding information to each of the R vectors. An indication of one or more basis vectors and their linear superposition coefficients.

That is, the receiving device can indicate the R vectors in a linear combination of beams.

Further, the reference channel state information is also used to indicate at least one power coefficient, and the at least one power coefficient is used to indicate a power ratio between vectors corresponding to each transmission layer.

That is, the receiving device may further indicate the R characteristic values corresponding to the R characteristic vectors obtained by the above SVD to the sending device. The R eigenvalues can represent the power ratio between the corresponding R eigenvectors. Therefore, in this application, the R eigenvalues are defined as information that can be used to indicate the power ratio between the vectors corresponding to the R transmission layers. In addition, the receiving device does not limit the way of indicating the R characteristic values. For example, use a normalized way to indicate and so on.

Compared with the aforementioned channel state information determined based on the R eigenvectors and port difference information, the channel state information determined by further combining the R eigenvalues is more accurate, and is more conducive to improving system transmission performance.

Description of the drawings

FIG. 1 is a schematic diagram of a communication system applicable to the method for indicating and determining channel state information according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a dual polarization direction antenna unit provided by an embodiment of the present application;

Figure 3 is a schematic diagram of a four-port QHA unit provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a channel between a sending device and a receiving device according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of indicating and determining channel state information provided by an embodiment of the present application;

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

FIG. 7 is a schematic block diagram of another communication device provided by an embodiment of the present application;

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

Fig. 9 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.

Long Term Evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide Interoperability for microwave access (worldwide interoperability for microwave access, WiMAX ) communication system, the fifth generation (5 ^th Generation, 5G) mobile communication system or a new radio access technology (new radio access technology, NR) or next generation communication, such as 6G. Among them, the 5G mobile communication system can be non-standalone (NSA) 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 Infrastructure (vehicle to infrastructure, V2I) communication, vehicle to pedestrian communication (V2P) or vehicle to network (V2N) communication, etc.

The technical solution provided herein can also be applied to future communication systems, such as the sixth generation (6 ^th Generation, 6G), mobile communication systems. 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 a baseband unit (BBU), or a distributed unit (DU), or a base station in the next-generation communication 6G system.

In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements part of the functions of gNB, and the DU implements part of the functions of gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implements radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer functions. 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 and AAU. It is understandable that the network device may be a device including one or more of the CU node, the DU node, and the 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 can also belong to the base station corresponding to the small cell. The small cell here can 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 the 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. .

To facilitate the understanding of the embodiments of the present application, a communication system suitable for the method provided in the embodiments of the present application will be described in detail with reference to FIG. 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 in the 5G system shown in FIG. 1; the communication system 100 may also include at least one terminal device, as shown in FIG. Terminal equipment 102 to 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 106 101 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.

To facilitate the understanding of the embodiments of the present application, the following briefly describes the processing procedure of the downlink signal at the physical layer before transmission. It should be understood that the processing of the downlink signal described below may be executed by a network device, or may be executed by a component (such as a chip or a chip system, etc.) configured in the network device. For the convenience of description, the following are collectively referred to as network devices.

Network equipment can process code words on physical channels. Wherein, the codeword may be coded bits that have been coded (for example, including channel coding). The codeword is scrambling to generate scrambled bits. The scrambled bits undergo modulation mapping (modulation mapping) to obtain modulation symbols. Modulation symbols are mapped to multiple layers, or transmission layers, after layer mapping. The modulation symbols after the layer mapping are precoding (precoding) to obtain a precoded signal. The precoded signal is mapped to multiple REs after resource element (resource element, RE) mapping. These REs are then modulated by orthogonal frequency division multiplexing (OFDM) and then transmitted through an antenna port (antenna port).

It should be understood that the processing procedure for the downlink signal described above is only an exemplary description, and should not constitute any limitation to this application. For the processing of the downlink signal, reference may be made to the prior art. For brevity, detailed description of the specific process is omitted here.

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. Antenna port: It can be abbreviated as a port. The antenna port may include a transmitting antenna port (or called a transmitting antenna port) and a receiving antenna port. In the embodiment of the present application, the transmitting antenna port may refer to the transmitting antenna port of the transmitting device. The receiving antenna port may refer to the receiving antenna port of the receiving device.

Among them, the transmitting antenna port can be understood as the transmitting antenna recognized by the receiving device, or the transmitting antenna that can be distinguished in space. For example, in downlink transmission, the transmitting antenna port may refer to the transmitting antenna port of the network device.

The receiving antenna 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.

2. Radiation characteristics: The radiation characteristics can specifically refer to the directional characteristics of the antenna radiation. The relationship between the relative field strength (for example, amplitude and phase) and the direction of the radiation field in the far area of the antenna is represented by a curve, and the radiation pattern of the antenna can be obtained. In the embodiment of the present application, since each transmitting antenna port of the antenna unit has radiation characteristics that are different from each other, the radiation direction characteristics of each transmitting antenna port are different. The radiation patterns corresponding to the transmitting antenna ports are also different from each other.

3. Antenna unit: In multi-antenna technology, transmitting equipment (such as network equipment) is usually equipped with a large-scale antenna array. The antenna array may include one or more antenna elements. Each antenna unit can be independent of each other.

In the embodiment of the present application, each antenna unit may include multiple transmitting antenna ports. Moreover, the radiation characteristics of the multiple transmitting antenna ports included in each antenna unit are different from each other.

For example, the antenna unit may be a two-port antenna unit. Each two-port antenna unit may include two transmitting antenna ports, and the two transmitting antenna ports have different radiation characteristics. As an example and not a limitation, the two-port antenna unit may be, for example, a dual polarization direction antenna unit. The so-called polarization direction refers to the direction of electric field oscillation formed when the antenna radiates. Therefore, polarization can be understood as a manifestation of radiation characteristics. The dual polarization direction antenna unit may include a transmitting antenna port in a first polarization direction and a transmitting antenna port in a second polarization direction. The first polarization direction and the second polarization direction may be two different polarization directions. That is to say, the transmitting antenna ports provided by the dual polarization direction antenna unit are two transmitting antenna ports with different polarization directions. As an example and not a limitation, the first polarization direction may be, for example, the horizontal polarization direction, and the second polarization direction may be, for example, the vertical polarization direction; the first polarization direction may also be, for example, the +45° direction, and the second polarization direction may be the +45° direction. The direction may also be a -45° direction, for example. This application does not limit this.

Fig. 2 is an example of a dual polarization direction antenna unit provided by an embodiment of the present application. As shown in the figure, Figure 2 shows 4 dual-polarized antenna elements, where, regardless of the coupling between the antenna elements in the antenna array, port 1, port 3, port 5, and port 7 are the first polarization directions Port 2, port 4, port 6, and port 8 are the transmitting antenna ports of the second polarization direction. In other words, port 1, port 3, port 5, and port 7 have the same polarization direction, or in other words, have the same radiation characteristics. Port 2, port 4, port 6, and port 8 have the same polarization direction, or in other words, have the same radiation characteristics.

For another example, the antenna unit may be a four-port antenna unit. Each four-port antenna unit may include four transmitting antenna ports, and the radiation characteristics of the four transmitting antenna ports are different from each other. As an example and not a limitation, the four-port antenna unit may be, for example, a quadrifilar helix antenna (QHA) unit (hereinafter referred to as a four-port QHA unit) independently driven by each spiral arm.

Fig. 3 is an example of a four-port QHA unit provided by an embodiment of the present application. As shown in the figure, Figure 3 shows two four-port QHA units, in which, regardless of the coupling between the antenna elements in the antenna array, ports 1 and 5 have the same radiation characteristics, and ports 2 and 6 have the same radiation Characteristics, ports 3 and 7 have the same radiation characteristics, and ports 4 and 8 have the same radiation characteristics.

It should be understood that the foregoing is only for ease of understanding, and an example of a two-port antenna unit and a four-port antenna unit are respectively shown. But this should not constitute any limitation to this application. This application does not limit the specific number and radiation characteristics of the transmitting antenna ports included in each antenna unit, and this application does not limit the specific type of antenna unit.

It should also be understood that the arrangement of the antenna units shown in FIG. 2 and FIG. 3 are only examples, and should not constitute any limitation to the present application. For example, the arrangement of the two-port antenna unit shown in FIG. 2 may be one row and four columns, two rows and two columns, or one column and four rows. For another example, the arrangement of the four-port antenna unit shown in FIG. 3 may be one row and two columns, or two rows and one column. This application does not limit this.

4. Channel matrix: In the multi-antenna technology, the dimension of the channel matrix between the transmitting device and the receiving device can be determined by the number of receiving antenna ports of the receiving device and the number of transmitting antenna ports of the transmitting device. Assuming that the number of receiving antenna ports of the receiving device is R and the number of transmitting antenna ports of the transmitting device is T, the channel matrix may be a matrix with a dimension of R×T. Each element in the matrix can represent channel information between a transmitting antenna port and a receiving antenna port.

Figure 4 shows a schematic diagram of a channel between a sending device and a receiving device. As shown in the figure, the number T of transmitting antenna ports of the transmitting device is 4, and the number of receiving antenna ports R of the receiving device is 2. If h is used to represent the channel between a transmitting antenna port and a receiving antenna port, h ₁₁ , h ₁₂ , h ₁₃ , and h ₁₄ can respectively represent port 1, port 2, port 3, and port 4 of the transmitting antenna port The channel between the port 1 and the receiving antenna port, h ₂₁ , h ₂₂ , h ₂₃ , and h ₂₄ can respectively represent the port 1, port 2, port 3, port 4 of the transmitting antenna port and the port of the receiving antenna port The channel between 2. From this, the channel matrix can be constructed

Among them, the first bit of the subscript of each channel corresponds to the receiving antenna port, and the last bit corresponds to the transmitting antenna port.

It should be understood that the above is only to facilitate the understanding of the following embodiments, and the channel matrix is described in detail. This application does not limit the dimensions of the transmitting antenna port, the receiving antenna port, and the channel matrix.

5. Reference antenna port and non-reference antenna port: As mentioned above, each antenna unit may include multiple antenna ports with different radiation characteristics. To facilitate distinction and description, in the embodiment of the present application, the multiple antenna ports included in each antenna unit are divided into reference antenna ports and non-reference antenna ports.

It should be noted that the reference antenna port and the non-reference antenna port are relative terms. Among the multiple antenna ports of the same antenna unit, the radiation characteristics of the antenna ports are different from each other. In order to facilitate the distinction, one of the ports is defined as a reference antenna port, and the other one or more antenna ports in the same antenna unit are defined as a non-reference transmitting antenna port.

For example, for a two-port antenna unit, each antenna unit may include a reference antenna port and a non-reference antenna port; for a four-port antenna unit, each antenna unit may include a reference antenna port and three non-reference antenna ports. Antenna port. Wherein, the reference antenna port in each antenna unit may be predefined, which is not limited in this application. Moreover, for multiple antenna units of the same type, the reference antenna port has the same or similar radiation characteristics.

For example, in the dual-polarization antenna unit described above in conjunction with FIG. 2, port 1, port 3, port 5, and port 7 are the antenna ports in the first polarization direction, which can be respectively defined as their respective antenna units. In the reference antenna port, port 2, port 4, port 6, and port 8 can be respectively defined as the non-reference antenna ports in the antenna unit to which they belong; or, port 2, port 4, port 6, and port 8 are the first The antenna ports in the two polarization directions can also be defined as the reference antenna ports in their respective antenna units, while port 1, port 3, port 5, and port 7 can be defined as non-standard antenna ports in their respective antenna units. Reference antenna port.

For another example, in the four-port QHA unit described above in conjunction with FIG. 3, port 1 and port 5 have the same radiation characteristics and can be respectively defined as the reference antenna port in the antenna unit to which they belong, and port 2, port 3 , Port 4, port 6, port 7, and port 8 can be respectively defined as non-reference antenna ports in the antenna unit to which they belong; or, port 2 and port 6 have the same radiation characteristics, or they can be defined as respective The reference antenna port in the antenna unit to which it belongs, and port 1, port 3, port 4, port 5, port 7, and port 8 can be respectively defined as non-reference antenna ports in the antenna unit to which they belong. By analogy, for the sake of brevity, I will not give an example here.

It should be understood that the above is only for ease of understanding. Taking dual-polarization direction antenna units and four-port QHA units as examples, the reference antenna ports and non-reference antenna ports are described in detail, but this does not apply to the antenna units applicable to this application. The type and number of ports included constitute any limit.

In addition, before introducing the instructions and methods for determining channel state information provided by the embodiments of the present application, the following descriptions are made.

First, in the embodiments of the present application, "used to indicate" may include used for direct indication and used for indirect indication. For example, when describing a certain indication information to indicate information I, it can include the indication information directly indicating I or indirectly indicating I, but it does not mean that I 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, when the port difference information in multiple transmitting antenna units is the same or similar, the port difference information of the multiple transmitting antenna units can be uniformly indicated. For example, one information element (IE) is used to indicate the port difference information, and the port difference information indicated by the information element may be applicable to the foregoing multiple transmit antenna units. In other words, the port difference information indicated by the information element is information that can be used by the above-mentioned multiple transmitting antenna units. As a result, the overhead of indicating port difference information can be reduced. In the following, there are many instructions for the same information. For the sake of brevity, the description of the same or similar situations is omitted hereafter.

For another example, the indication of multiple coefficients can be realized by means of pre-arrangement (for example, stipulated by agreement). For example, the indication of N-1 coefficients can be normalized. Specifically, the receiving device can indicate the position of the coefficient with the largest modulus among the N-1 coefficients and the quantized value of the other N-2 coefficients with respect to the coefficient with the largest modulus, but it is not necessary to The values of -1 coefficients are all indicated. However, the sending device can determine the N-1 coefficients in the same manner, so the indication can be regarded as an indication of the N-1 coefficients. In the following, many places involve the indication of multiple coefficients. For the sake of brevity, the description of the same or similar situations is omitted hereafter.

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 indication mode can be selected according to specific needs, and the embodiment of the present application does not limit the selected indication mode. In this way, the instruction methods involved in the embodiments of the present application should be understood to cover various methods that enable the party to be instructed to obtain the information to be instructed.

In addition, the information to be indicated may have other equivalent forms. For example, a row vector can be expressed as a column vector, a matrix can be expressed by the transpose matrix of the matrix, and a matrix can also be expressed in the form of a vector or an array. It can be formed by connecting each row vector or column vector of the matrix, and the Kronecker product of two vectors can also be expressed in the form of the product of one vector and the transposed vector of the other vector. The technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, some or all of the characteristics involved in the embodiments of the present application should be understood to cover various manifestations of the characteristics.

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. Wherein, the configuration information may include, but is not limited to, radio resource control signaling, such as radio resource control (RRC) signaling, medium access control (MAC) layer signaling, such as MAC-CE , And physical layer signaling, such as one or a combination of at least two of downlink control information (DCI).

Second, in the embodiments of the present application, for ease of description, when serial numbers are involved, serial numbers can be started from 0. For example, the R transport layers may include the first transport layer to the Rth transport layer. By analogy, I will not illustrate them one by one here. Of course, the specific implementation is not limited to this, for example, it can also be numbered consecutively starting from 1. For example, the R transport layers may include the 0th transport layer to the R-1th transport layer, and so on.

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, the transformation of matrices and vectors is involved in many places. For ease of understanding, the same explanation is given here. The superscript T represents transpose, for example, ^AT represents the transpose of matrix (or vector) A; the superscript H represents conjugate transpose, for example, A ^H represents the conjugate transpose of matrix (or vector) A. For the sake of brevity in the following text, the description of the same or similar situations is omitted; the superscript * represents the conjugate, for example, A ^* represents the conjugate of the matrix (or vector) A. In addition, the superscript * can also indicate the conjugate of a complex number. This application does not limit this. For the sake of brevity in the following text, the description of the same or similar situations is omitted.

Fourth, in the embodiments shown below, taking a terminal device as an example of a receiving device and a network device as an example of a sending device, the instructions provided by the embodiments of the present application and the method for determining channel state information are explained in detail. Therefore, the terminal device in the following embodiments can be replaced with a receiving device, and the network device can be replaced with a sending device.

However, it should be understood that this should not constitute any limitation to this application. This application does not limit the devices specifically referred to by the receiving device and the sending device. As long as the transmitting antenna unit configured by the transmitting device can provide multiple antenna ports, the method provided in this application can be used to indicate and determine the channel state information.

Fifth, the channel state information (channel state information, CSI) is the protocol information of the current feedback to the terminal apparatus for describing channel network device Third Generation Partnership state ^{(3 rd generation partnership project, 3GPP} ). But this should not constitute any limitation to this application. The receiving device in this application may also send channel state information to the sending device to indicate the channel state between the sending device and the receiving device. Moreover, the channel state information is not limited to the precoding matrix indicator (PMI) defined in the 3GPP protocol, and can also be used to indicate other information that can be used to indicate the channel state, such as the covariance of the channel described below. Matrix etc.

Sixth, the definitions listed in this application for many characteristics (such as Kronecker product, precoding vector, channel, etc.) are only used to explain the function of this characteristic by way of example. For details, please refer to current technology.

Seventh, 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.

Eighth, “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 equipment (for example, including terminal equipment and network equipment). 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.

Ninth, 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.

Tenth, "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.

Eleventh, 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.

Twelfth, in the embodiments of the present application, antenna ports (or called ports), transmitting antenna ports (or called transmitting antenna ports, transmitting ports), and receiving antenna ports (or called receiving ports) are mentioned in multiple places. The transmitting antenna port is the antenna port configured by the transmitting device, and the receiving antenna port is the antenna port configured by the receiving device. The "transmit" and "receive" indications are defined for the convenience of distinction, and the antenna ports are not distinguished by transmitting/receiving when the transmitting device or the receiving device is not involved.

Similarly, the embodiments of the present application also involve antenna units and transmitting antenna units, reference antenna ports and reference transmitting antenna ports, non-reference antenna ports and non-reference transmitting antenna ports. Among them, "transmit" is intended to emphasize that the antenna unit, or reference antenna port, or non-reference antenna port is the antenna unit, or reference antenna port, or non-reference antenna port configured in the transmitting device. In the case that the transmitting device is not involved, it may not be emphasized that it is a transmitting antenna unit, a reference transmitting antenna port, and a non-reference transmitting antenna port.

The following situations and the like can be understood with reference to the above, and for the sake of brevity, no examples are given.

The method for indicating and determining channel state information provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The method provided in the embodiments of the present application can be applied to a system including a sending device and a receiving device. This method can be used to indicate the channel state information between the sending device and the receiving device. In the embodiment of the present application, the transmitting device may include one or more transmitting antenna units, and each transmitting antenna unit includes multiple transmitting antenna ports. Moreover, the multiple transmitting antenna ports included in each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port. In the embodiment of the present application, the number of transmit antenna ports included in each transmit antenna unit is the same, for example, N (N>1 and an integer). The receiving device may also include one or more receiving antenna ports. This application does not limit this. The channel between a reference transmitting antenna port and a receiving antenna port can be referred to as a reference transmission channel. In other words, a reference transmitting antenna port and a receiving antenna port constitute a reference transmission channel.

Optionally, the sending device is a network device, and the receiving device is a terminal device. The terminal device can indicate the channel state information of the downlink channel to the network device based on the method provided in the embodiment of the present application. The following will take the interaction between the network device and the terminal device as an example to describe in detail the method for indicating channel state information provided in the embodiment of the present application. It should be understood that this application does not limit the sending device and the receiving device. As long as the transmitting device is configured with antenna units including transmitting antenna ports with different radiation characteristics, the methods described below can be used.

It should also 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. The execution subject for executing the method provided by the embodiment of the present application only needs to be able to communicate according to the method provided by the embodiment of the present application by running a program that records the code of the method provided by the embodiment of the present application. For example, the terminal device shown in the following embodiments can be replaced with a functional module in the terminal device that can call and execute the program, such as a component (such as a circuit, a chip, or a chip system, etc.) configured in the terminal device. The network device shown in the following embodiment can also be replaced with a functional module in the network device that can call and execute the program, for example, a component (such as a circuit, a chip, or a chip system, etc.) configured in the network device.

It should also be understood that, in the embodiments of the present application, the terminal device and/or the network device may perform some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application may also perform other operations or various operations. Deformation of the operation. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it may not be necessary to perform all the operations in the embodiments of the present application.

The method for indicating and determining channel state information provided by the embodiment of the present application will be described in detail below with reference to FIG. 5. FIG. 5 is a schematic flowchart of a method 500 for indicating channel state information from the perspective of device interaction. As shown in FIG. 5, the method 500 may include step 510 to step 540. The steps in the method 500 are described in detail below.

In step 510, the terminal device generates reference channel state information and port difference information.

The reference channel state information may specifically refer to channel state information obtained from at least one reference transmission channel. Since each reference transmission channel is composed of a reference antenna port and a receiving antenna port, the reference channel state information can be composed of at least one of the multiple transmitting antenna units in the transmitting device and one or more of the receiving device. The channel between the receiving ports is determined.

The reference channel state information may be, for example, the channel itself of the reference transmission channel, or it may be obtained after performing mathematical transformation on the at least one reference transmission channel. For example, the matrix formed by at least one reference channel is obtained by mathematical transformation. The reference channel state information will be described below in conjunction with specific examples, and a detailed description of the reference channel state information will be omitted here.

Since each reference transmitting antenna port belongs to a transmitting antenna unit, and each transmitting antenna unit also includes at least one non-reference transmitting antenna port, the terminal device may further indicate the difference in radiation characteristics between the ports, so that the non-reference transmitting antenna The channel state information between the port and the receiving port is also indirectly expressed through the difference in radiation characteristics between the ports.

In the embodiment of the present application, the radiation characteristic difference between the reference transmitting antenna port and the non-reference transmitting antenna port in each transmitting antenna unit may be represented by port difference information.

In a possible implementation manner, the port difference information can be characterized by coefficients. The difference in radiation characteristics between any non-reference antenna port and the reference antenna port can be characterized by coefficients.

For example, suppose that the antenna port in the first polarization direction in the dual-polarization antenna unit is a reference antenna port, and the antenna port in the second polarization direction is a non-reference antenna port. The difference in radiation characteristics between the reference antenna port and the non-reference antenna port can be characterized by a coefficient α.

For another example, suppose that the difference in radiation characteristics between a reference antenna port in a four-port QHA unit and the other three non-reference antenna ports in the same antenna unit can also be characterized by coefficients α ₁ , α ₂ , and α _{3 respectively} .

Further, the difference in radiation characteristics between the other three non-reference antenna ports can also be characterized by coefficients. For example, the difference in radiation characteristics between each of the three non-reference antenna ports can be characterized by α ₄ , α ₅ , and α _{6 respectively} . The relationship between each coefficient and the port will be described in detail below in conjunction with specific embodiments, and will not be described in detail here.

In this way, the channel between any non-reference transmitting antenna port and a certain receiving antenna port and the channel between the reference transmitting antenna port and the same receiving antenna port can be correlated by the coefficient. For example, assuming that in a dual-polarization transmitting antenna unit, the difference in radiation characteristics between the transmitting antenna port in the first polarization direction and the transmitting antenna port in the second polarization direction can be characterized by the coefficient α, then the first polarization direction The difference between the channel between the transmitting antenna port and a certain receiving antenna port (for example, denoted as h ₁ ) and the channel between the transmitting antenna port in the second polarization direction and the same receiving antenna port (for example, denoted as h ₂ ) is also It can be related by the coefficient α. For example, h ₂ =αh ₁ .

It should be understood that the foregoing is only for ease of understanding, and exemplarily shows the channel relationship between the transmitting antenna ports of the two polarization directions and the same receiving antenna port. But this should not constitute any limitation to this application.

In another possible implementation manner, the port difference information can be obtained from the aforementioned coefficients. For example, the matrix formed by the above coefficients is obtained by mathematical transformation. Since the port difference information will be described below in conjunction with specific examples, a detailed description of the port difference information will be omitted for the time being.

For ease of understanding and description, the reference channel state information and port difference information will be described in detail below in conjunction with the two-port antenna unit and the four-port antenna unit listed above.

As an embodiment, the transmitting antenna unit configured by the transmitting device is a two-port antenna unit. For ease of understanding, it is assumed here that the number of receiving antenna ports configured by the receiving device is 1. The following embodiment firstly uses a transmitting antenna unit as an example to illustrate the channel between a two-port antenna unit and one receiving antenna port, and then further illustrates the channel between multiple two-port antenna units and one receiving antenna port.

For a two-port antenna unit, it may include a reference antenna port and a non-reference antenna port. It is assumed that the two-port antenna unit is one of the dual-polarized antenna units described above in conjunction with FIG. 2, such as including port 1 and port 2. Then the channel H between the two transmitting antenna ports and the receiving antenna port in the transmitting antenna unit can be expressed as H=[h ₁ h ₂ ].

As mentioned above, the difference in radiation characteristics between the two transmitting antenna ports can be characterized by the coefficient α, and the channels between the two transmitting antenna ports and the receiving antenna ports can be related by the coefficient α, that is, h ₂ =αh ₁ . Then, the channel between the two transmitting antennas and the receiving antenna port in the above transmitting antenna unit can be expressed as h ₁ [1 α]. Therefore, the channel between the non-reference transmitting antenna port and the receiving port can also be represented by the reference transmission channel.

Further, the covariance matrix H ^H H of the channel H can be expressed as [h ₁ h ₂ ] ^H [h ₁ h ₂ ], and h ₁ _{and h 2} can be correlated through the coefficient α, and we can get

Hereinafter, for convenience of explanation, H ^H H is denoted as R _HH . In the following examples, H ^H H and R _HH are used interchangeably, and unless otherwise specified, the meanings expressed are the same.

If the transmitting device includes multiple two-port antenna units, as shown in FIG. 2, the four dual-polarized antenna units include port 1 to port 8. Then the channel H between each transmitting antenna port and the receiving antenna port in the transmitting device can be expressed as H=[h ₁ h ₂ ... H ₇ h ₈ ]. If port 1, port 3, port 5, and port 7 are defined as reference transmitting antenna ports, based on the similar derivation above, the channel H can also be expressed as H=[h ₁ α ¹ h ₁ h ₃ α ² h ₃ h ₅ α ³ h ₅ h ₇ α ⁴ h ₇ ]. Among them, α ¹ , α ² , α ³ , and α ⁴ are the radiation characteristics between the reference transmitting antenna port and the non-reference transmitting antenna port in the transmitting antenna unit 1, the transmitting antenna unit 2, the transmitting antenna unit 3, and the transmitting antenna unit 4, respectively. difference.

Therefore, the covariance matrix of the channel between each transmitting antenna unit and a receiving port can be expressed as similar to

form. For example, for the transmitting antenna unit 1, the covariance matrix of the channel between it and the receiving antenna port can be expressed as

For the transmitting antenna unit 2, the covariance matrix of the channel between it and the receiving antenna port can be expressed as

For the transmitting antenna unit 3, the covariance matrix of the channel between it and the receiving antenna port can be expressed as

For the transmitting antenna unit 4, the covariance matrix of the channel between it and the receiving antenna port can be expressed as

Optionally, the radiation characteristic differences among the ports in the multiple transmitting antenna units are the same or similar. In other words, the difference in radiation characteristics between ports in multiple transmitting antenna units can be characterized by the same coefficient, or in other words, the difference in radiation characteristics between ports in the multiple transmitting antenna units can be uniformly indicated, for example, by the same cell. . Therefore, the difference in radiation characteristics between ports in a certain transmitting antenna unit can be applied to the above-mentioned multiple transmitting antenna units.

For example, the radiation characteristic difference between port 1 and port 2 in transmitting antenna unit 1, the radiation characteristic difference between port 3 and port 4 in transmitting antenna unit 2, and the port in transmitting antenna unit 3 shown above are The radiation characteristic difference between port 5 and port 6 and the radiation characteristic difference of port 7 and port 8 in the transmitting antenna unit 4 can all be represented by the same coefficient. That is, α ¹ =α ² =α ³ =α ⁴ . In this case, the covariance of the channel between the transmitting antenna port and one receiving antenna port in the multiple transmitting antenna units can be expressed as:

among them,

Represents Kronecker product.

In fact, the channel between each transmitting antenna port and the receiving antenna port does not necessarily have to be represented by the reference transmitting antenna port in each transmitting antenna unit. For example, the difference between each transmitting antenna unit can also be characterized by a coefficient, for example, h ₃ =βh ₁ . Alternatively, the transmitting antenna units may also be the same, which may be represented by the channel between the transmitting antenna port and the receiving antenna port in the same transmitting antenna unit, for example, h ₃ =h ₁ . In other words, the above-mentioned reference channel state information may be channel state information obtained based on at least one reference transmission channel corresponding to at least one of the above-mentioned multiple transmitting antenna units.

In the following, for ease of understanding and explanation, it is assumed that the radiation characteristic differences between the ports in the multiple transmitting antenna units are the same or similar. That is, the radiation characteristic differences between the reference transmitting antenna and the non-reference transmitting antenna in the multiple transmitting antenna units are all characterized by the coefficient α. Different channels are still distinguished by different subscripts, such as h ₁ , h ₃ , h ₅ and h ₇ .

For ease of understanding, among the multiple calculation formulas listed above,

The left part is denoted as R _AA ,

The part on the right is denoted as R _QQ . In other words,

Among them, R _{AA is} related to the reference transmission channel, and R _{QQ is} related to the radiation characteristics between ports. The above-mentioned reference channel state information may be _{, for example, R AA} or a result obtained by performing mathematical transformation on R _AA. The aforementioned port difference information may be _{, for example, R QQ} , or a result obtained by performing mathematical transformation _{on R QQ.}

Combining the above example,

Looking further at R _{AA, we} can find that R _AA can also pass

It is calculated, that is, R _AA can be calculated from [h ₁ h ₃ h ₅ h ₇ ] ^H [h ₁ h ₃ h ₅ h ₇ ]. If [h ₁ h ₃ h ₅ h ₇ ] is written as H', then R _AA =(H') ^H H'.

Similarly, if the number of receiving antenna ports is greater than 1, for example, the number of receiving antenna ports is 2 (such as port 1 and port 2), then channel H can be expressed as

Further seeking the covariance matrix for this channel H, we can get

If it passes the above

To express, you can get:

That is,

For ease of understanding, the process of deriving R _AA and R _QQ _{from R HH is exemplarily given below.} It should be understood that the formula derivation process shown below is only an example for ease of understanding, and should not constitute any limitation to the application.

If h ₁ =[h ₁₁ h ₁₂ … h ₁₈ ], h ₂ = [h ₂₁ h ₂₂ … h ₂₈ ], we can get:

Substituting h ₁ =[h ₁₁ h ₁₂ … h ₁₈ ], h ₂ = [h ₂₁ h ₂₂ … h ₂₈ ] can be obtained:

Looking further at R _{AA, we} can find that R _AA can also pass

Calculated. If will

Denoted as H', then R _AA =(H') ^H H'.

By analogy, if the number of transmitting antenna ports is greater than 1, such as the number of transmitting antenna ports is T (for example, including port 1 to port T, T>1 and an integer); if the number of receiving antenna ports is also greater than 1, such as the number of receiving antenna ports Is M (for example, including port 1 to port M, M>1 and an integer), then channel H can be expressed as:

Further seeking the covariance matrix for this channel H, we can get

Further derivation can be obtained:

If it passes the above

To express, you can get:

Further observation of R _AA can reveal that R _AA can also pass

Calculated. If will

Denoted as H', then R _AA =(H') ^H H'.

It should be understood that the above is only for ease of understanding, and shows the channel, the covariance matrix of the channel, the reference transmission channel, etc. in the case of different numbers of transmitting antenna ports and different numbers of receiving antenna ports. However, the formula shown above is only an example, and should not constitute any limitation to this application. For example, if the naming rules for port numbers are different, the subscripts in the above formula may change. Based on the same concept, those skilled in the art can perform mathematical transformations or equivalent replacements on the formulas listed above, and these mathematical transformations or equivalent replacements should fall within the protection scope of this application.

As another embodiment, the transmitting antenna unit configured by the transmitting device is a four-port antenna unit. For ease of understanding, it is assumed here that the number of receiving antenna ports configured by the receiving device is 1. The following embodiment first uses a transmitting antenna unit as an example to illustrate the channel between a four-port antenna unit and one receiving antenna port, and then further illustrates the channel between multiple four-port antenna units and one receiving antenna port.

For a four-port antenna unit, it can include one reference antenna port and three non-reference antenna ports. It is assumed that the four-port antenna unit is one of the four-port QHA units described above with reference to FIG. 3, such as including port 1, port 2, port 3, and port 4. Then the channel H between the four transmitting antenna ports and one receiving antenna port in the transmitting antenna unit can be expressed as H=[h ₁ h ₂ h ₃ h ₄ ].

As mentioned above, the difference in radiation characteristics between the three non-reference transmitting antenna ports and the reference transmitting antenna port among the four transmitting antenna ports can be characterized by the coefficients α ₁ , α ₂ , and α ₃ , and each non-reference transmitting antenna The channel between the port and the reference transmitting antenna port can be related by coefficients, for example, h ₂ =α ₁ h ₁ , h ₃ =α ₂ h ₁ , and h ₄ =α ₃ h ₁ . Then, the channel between the two transmitting antennas and the receiving antenna port in the above transmitting antenna unit can be expressed as h ₁ [1 α ₁ α ₂ α ₃ ]. Therefore, the channel between the non-reference transmitting antenna port and the receiving port can also be represented by the reference transmission channel.

Further, the covariance matrix H ^H H of the channel H can be expressed as [h ₁ h ₂ h ₃ h ₄ ] ^H [h ₁ h ₂ h ₃ h ₄ ], which can be correlated through the coefficients α ₁ , α ₂ , and α ₃ h ₁ and h ₂ , h ₃ , h ₄ , we can get

Among them, h ₂ =α ₁ h ₁ , h ₃ =α ₂ h ₁ , h ₄ =α ₃ h ₁ , and h ₂ ^* h ₃ =α ₁ ^* h ₁ ^* α ₂ h ₁ , h ₂ ^* h ₄ = α ₁ ^* h ₁ ^* α ₃ h ₁ , h ₃ ^* h ₄ = α ₂ ^* h ₁ ^* α ₃ h ₁ . Further associate port 2 and port 3, port 2 and port 4, and port 3 and port 4 through coefficients α ₄ , α ₅ , α ₆ _{, α 4} =α ₁ ^* α ₂ , α ₅ = α ₁ ^* α ₃ , α ₆ = α ₂ ^* α ₃ . From this, it can be obtained: h ₂ ^* h ₃ =α ₄ h ₁ ^* h ₁ , h ₂ ^* h ₄ = α ₅ h ₁ ^* h ₁ , and h ₃ ^* h ₄ = α ₆ h ₁ ^* h ₁ . Therefore, the covariance matrix H ^H H of channel H can be expressed as:

It can be seen that in the above process of correlating port 2 and port 3, port 2 and port 4, and port 3 and port 4 _{through the coefficients α 4} , α ₅ , and α _{6, the reference transmission channel corresponding to port 1 is also used as the benchmark.} To associate. _{In other words, the coefficient α 4} used to indicate the difference in radiation characteristics between port 2 and port 3, the coefficient α 5 used to indicate the difference in radiation characteristics between port 2 and port 4, and the coefficient α ₅ used to indicate the difference in radiation characteristics between port 3 and port 4 in the above _{The coefficient α 6 of the} difference in radiation characteristics can be understood as a value relative to the reference transmission channel corresponding to port 1.

If the transmitting device includes multiple four-port antenna units, as shown in FIG. 3, the two four-port QHA antenna units include port 1 to port 8. Then the channel between each transmitting antenna port in the transmitting device and the receiving antenna port can be expressed as H=[h ₁ h ₂ ... H ₇ h ₈ ]. If ports 1 and 5 are defined as reference transmitting antenna ports, based on the similar derivation above, the channel H can also be expressed as:

Wherein, the superscript of each coefficient indicates the antenna unit to which it belongs, and the subscript indicates the difference in radiation characteristics between the non-reference transmitting antenna port and the reference transmitting antenna port in the corresponding antenna unit. Such as,

Can be used to indicate the difference in radiation characteristics between port 2 and port 1 in the transmitting antenna unit 1,

It can be used to indicate the difference in radiation characteristics between port 2 and port 1 in the transmitting antenna unit 2, and so on, and it is not listed here.

For example, for the transmitting antenna unit 1, the covariance matrix of the channel between it and the receiving antenna port can be expressed as

Optionally, the radiation characteristic difference among the ports in the multiple transmitting antenna units is the same. In other words, the difference in radiation characteristics between ports in multiple transmitting antenna units can be characterized by the same coefficient. For example, the radiation characteristic difference between the port 1 and the port 2 in the transmitting antenna unit 1 and the radiation characteristic difference between the port 5 and the port 6 in the transmitting antenna unit 2 shown above can be represented by the same coefficient. which is,

The radiation characteristic difference between the port 1 and the port 3 in the transmitting antenna unit 1, and the radiation characteristic difference between the port 5 and the port 7 in the transmitting antenna unit 2 can be represented by the same coefficient. which is,

The radiation characteristic difference between the port 1 and the port 4 in the transmitting antenna unit 1, and the radiation characteristic difference between the port 5 and the port 8 in the transmitting antenna unit 2 can be represented by the same coefficient. which is,

Ruo Ling

Then the covariance matrix of the channel between the transmitting antenna port and one receiving antenna port in the multiple transmitting antenna units can be expressed as

In fact, the channel between each transmitting antenna port and the receiving antenna port does not necessarily have to be represented by the reference transmitting antenna port in each transmitting antenna unit. For example, the difference between each transmitting antenna unit can also be characterized by a coefficient, for example, h ₅ =βh ₁ . Alternatively, the transmitting antenna units may also be the same, which may be represented by the channel between the transmitting antenna port and the receiving antenna port in the same transmitting antenna unit, for example, h ₅ =h ₁ . In other words, the above-mentioned reference channel state information may be channel state information obtained based on at least one reference transmission channel corresponding to at least one of the above-mentioned multiple transmitting antenna units.

In the following, for ease of understanding and description, it is assumed that the radiation characteristic differences between the ports in the multiple transmitting antenna units are the same or similar. That is, the radiation characteristic differences between the reference transmitting antenna and the non-reference transmitting antenna in the multiple transmitting antenna units are all characterized by coefficients α ₁ to α ₆ . Different channels are still distinguished by different subscripts, such as h ₁ , h ₅ .

Based on the above description of the reference channel state information and port difference information of the two-port antenna unit, it can be known that the covariance matrix of channel H can satisfy:

In this embodiment,

Among them, R _AA can pass

It is calculated, that is, R _AA can be calculated from [h ₁ h ₅ ] ^H [h ₁ h ₅ ]. If [h ₁ h ₅ ] will be recorded as H', then R _AA =(H') ^H H'.

Similarly, if the number of transmitting antenna ports is greater than 1, such as the number of transmitting antenna ports is T (for example, including port 1 to port T, T>1 and an integer); if the number of receiving antenna ports is greater than 1, such as the number of receiving antenna ports Is M (for example, including port 1 to port M), then channel H can be expressed as:

Further seeking the covariance matrix for this channel H, we can get

Further derivation can be obtained:

If it passes the above

To express, you can get:

Looking further at R _{AA, we} can find that R _AA can also pass

Calculated. If will

Denoted as H', then R _AA =(H') ^H H'.

The following describes in detail the indication of the reference channel state information and the port difference information by the terminal device in combination with a variety of different implementation manners.

For example, the terminal device may indicate the covariance matrix of the channel to the network device, so that the network device can restore the covariance matrix of the channel based on the instruction of the terminal device. The indication of the covariance matrix of the channel by the terminal device may be based on the above formula, for example

To indicate R _AA and R _{QQ respectively} .

The terminal device may also indicate the precoding matrix adapted to the channel to the network device, so that the network device can determine the precoding matrix adapted to the signal based on the instruction of the terminal device. The indication of the precoding matrix by the terminal device may be, for example, an indication of the precoding vector corresponding to each of the R transmission layers. For the rth transport layer in R transport layers, you can pass

To indicate the corresponding precoding vector. Where p _r is the precoding vector corresponding to the r-th transmission layer; v _r may be the r-th eigenvector among the R eigenvectors obtained by performing singular value decomposition (SVD) _{on R AA; q} _r may be the r-th eigenvector among the R eigenvectors obtained by performing SVD _{on R QQ.} Among them, r can traverse the value from 1 to R. That is, r=1, 2, ..., R.

The following is a detailed description of the indication of the reference channel state information and the indication of the port difference information.

1. Reference channel status information:

Assuming that SVD is performed on H', it can be expressed as H'=UΛV ^H. Then the process of performing SVD on R _AA _{is as follows: R AA} =(H') ^H H'=(UΛV ^H ) ^H UΛV ^H =VΛU ^H UΛV ^H =VΛ ² V ^H. If V=[v ₁ v ₂ … v _R ], then

Among them, diag[] represents a diagonal array.

Among them, R represents the maximum number of transmission layers, or in other words, the rank of the channel determined based on channel measurement. R≥1 and is an integer. v ₁ to v _R represent eigenvectors corresponding to the first transmission layer to the Rth transmission layer, and a ₁ to a _R represent eigenvalues corresponding to the first transmission layer to the Rth transmission layer. The R eigenvalues may be used to indicate the power ratio between the vectors (eg, eigenvectors, or precoding vectors) corresponding to the R transmission layers. Therefore, the R eigenvalues can be called R power coefficients.

That is, the reference channel state information can be used to indicate information corresponding to R transport layers. As described above, the remembered channel information can be used to indicate R vectors corresponding to R transport layers.

It can be seen that in _{the result of performing SVD on R AA} , the unitary matrix on the left side of the diagonal matrix and the unitary matrix on the right have the same conjugate transpose, that is, the R eigenvectors obtained by performing SVD _{on R AA} It can be understood as a precoding vector corresponding to R transmission layers determined by the reference transmission channel H′. _{If the R eigenvectors obtained by performing SVD on the R AA} determined by the reference transmission channel are further combined with the port difference information described above, they can be used to determine the precoding vectors corresponding to the R transmission layers. Therefore, the _{indication of R AA} described below can also be understood as a part of the indication of the precoding vector in a certain sense.

Exemplarily, if the number of receiving antenna ports is 1, _{performing SVD on R AA} can obtain a precoding vector of at most one transmission layer. That is, in this embodiment, R _AA =v ₁ a ₁ v ₁ ^* . The precoding vector can be determined by the aforementioned feature vector v ₁ and feature value a ₁ .

If the number of receiving antenna ports is 2, _{performing SVD on R AA} can obtain up to two transmission layer precoding vectors. That is, in this embodiment,

The precoding vector may be determined by the aforementioned feature vectors v ₁ , v ₂ and feature values a ₁ , a ₂ . It can be seen from this that _{the indication of R AA and} the indication of v _r are essentially the same, and both are indications of the above R eigenvectors. Therefore, the indication of the reference channel state information by the terminal device may include the indication of the above-mentioned R feature vectors.

Several possible implementations of the R eigenvectors are exemplarily given below.

In an implementation manner, the R feature vectors may be indicated by way of port selection, for example. For example, each feature vector of the R feature vectors may be indicated by the index of a basis vector closest to it in the predefined basis vector set.

Assuming that the vector in the basis vector set is denoted as b, for example, the r-th eigenvector among R eigenvectors can be indicated _{by the basis vector b r.} When the terminal device indicates the basis vector b _r , for example, it may indicate the index of the basis vector b _r in the basis vector set.

In another implementation manner, the R eigenvectors may also be indicated by beam combining. For example, each of the R eigenvectors may be approximately characterized by the linear superposition and sum of one or more basis vectors in the predefined basis vector set. In this case, the indication of the R feature vectors may be, for example, one or more selected basis vectors and their corresponding linear superposition coefficients in the basis vector set.

For example, each feature vector in the R feature vectors may be indicated by the linear superposition sum of one or more basis vectors in the basis vector set. Assuming that the vector in the basis vector set is denoted as b, for example, the r-th eigenvector in R eigenvectors can be passed through L basis vectors

to

The linear superposition and sum to indicate.

The terminal device's indication of the linear superposition sum of one or more basis vectors in the basis vector set may include an indication of the one or more basis vectors and an indication of the linear superposition coefficient corresponding to the one or more basis vectors.

Wherein, the indication of one or more basis vectors, such as the indication of the above L basis vectors, can be indicated by the index of the one or more basis vectors in the basis vector set, or can indicate the one or more basis vectors. The combination of the two basis vectors is indicated by the index in the basis vector set. For the specific manner of indicating one or more basis vectors, reference may be made to the prior art. This application does not limit this.

An indication of the linear superposition coefficient corresponding to the above one or more basis vectors, such as the above

to

The indication of can be indicated in a normalized manner, or indicated by a quantized value or an index of a quantized value, or a combination of the above two methods. For the specific manner of indicating one or more linear superposition coefficients, reference may be made to the prior art. This application does not limit this. It should be understood that the indication of one or more linear superposition coefficients does not necessarily indicate each linear superposition coefficient. For example, when the normalization method is used to indicate, it may only indicate the value of some of the linear superposition coefficients. , But the one or more linear superposition coefficients can still be determined based on the indicated information.

Further, the reference channel state information can also be used to indicate the R eigenvalues corresponding to the above R eigenvectors obtained by performing SVD _{on R AA.} The indication of the R feature values can be, for example, normalized, or can also be indicated by indicating the quantized value of each feature value or the index of the quantized value, or can also be a combination of the above two methods To indicate each coefficient, or to indicate each feature value in other prior art methods. This application does not limit this.

It can be understood that the eigenvalue can represent the power ratio between the eigenvectors of each transmission layer. Therefore, in this embodiment, the characteristic value is indicated in the reference channel state information, which can improve the feedback accuracy. For example, by indicating the characteristic value, the power ratio between the precoding vectors corresponding to each transmission layer is indicated, thereby improving the codebook feedback accuracy.

2. Port difference information:

The terminal device's indication of the port difference information may be, for example, an indication of the aforementioned R _QQ , or an indication of R feature vectors obtained by performing SVD _{on the R QQ.}

_{As mentioned above, the R QQ} determined by the terminal device based on the covariance matrix of the channel H includes N(N-1)/2 coefficients. If SVD is performed on R _QQ , R eigenvectors can be obtained, and each eigenvector includes N-1 coefficients. The terminal device's indication of the port difference information may be an indication of R _QQ, an indication of R eigenvectors, or an indication of the first eigenvector among them. This application does not limit this.

Wherein, _{the indication of R QQ} is combined with the indication of R _AA described above to determine the covariance matrix of the channel. Combining the indications of the R eigenvectors obtained by performing SVD on R _QQ with the indications _{of the R eigenvectors obtained by performing SVD on R AA} as described above, the precoding vectors corresponding to the R transmission layers can be determined. The indication of the first feature vector among the R feature vectors obtained by performing SVD on the R _QQ may be to apply the feature vector to the R transmission layers to determine the precoding vector corresponding to the R transmission layers. The above indication of the R eigenvectors can be understood as indicating respectively _{q 1} to q _R. In contrast, the indication of the first eigenvector of the R eigenvectors can be understood as _{a unified indication of q 1} to q _R , or, assuming that q ₁ =...=q _R , then The R feature vectors are approximately indicated by only one feature vector.

As mentioned above, the difference in radiation characteristics between ports in the multiple transmitting antenna units may be different from each other. Therefore, the radiation difference characteristics between the reference transmitting antenna port and the non-reference transmitting antenna port in the transmitting antenna unit included in the port difference information can be represented by multiple R _QQs similar to those described above. The terminal device's indication of the port difference information may include an indication of multiple R _QQ or multiple q _r indications. Here, each group of q _r may correspond to one transmitting antenna unit, and may include q ₁ to q _R.

The ports in the multiple transmitting antenna units can also be the same in terms of radiation difference characteristics. Therefore, the radiation difference characteristics between the reference transmitting antenna port and the non-reference transmitting antenna port in the transmitting antenna unit included in the port difference information can be represented by the same R _QQ . The terminal device's indication of the port difference information may only include an indication of one R _QQ or a group of q _r . Here, the set of q _r may include q ₁ to q _R.

The following uses an R _QQ as an example to illustrate the instructions for port difference information. For ease of understanding and description, it is assumed that each transmitting antenna unit includes N (N≥2 and an integer) transmitting antenna ports with different radiation characteristics.

Optionally, the port difference information includes an indication of N(N-1)/2 coefficients in _{R QQ.} For example, for a four-port antenna unit, assuming that port 1 is the reference transmitting antenna port, _{the indication of R QQ} may include an indication of 6 coefficients. The six coefficients can be used to represent: the difference in radiation characteristics between port 1 and port 2, the difference in radiation characteristics between port 1 and port 3, the difference in radiation characteristics between port 1 and port 4, and port 2 and port The difference in radiation characteristics among 3 relative to the value of port 1, the difference in radiation characteristics between port 2 and port 4 relative to the value of port 1, and the difference in radiation characteristics between port 3 and port 4 relative to the value of port 1.

Optionally, the port difference information includes an indication of the N-1 coefficient in each of the R feature vectors obtained by performing SVD _{on the R QQ.}

For example, _{performing SVD on R QQ} can obtain R feature vectors q ₁ to q _R. Each feature vector includes N-1 coefficients. The terminal device may indicate N-1 coefficients for each feature vector, so that the network device can determine the R feature vectors q ₁ to q _R.

The R feature vectors q ₁ to q _R can be combined with the R feature vectors v ₁ to v _R described above, respectively, to determine the precoding vectors p ₁ to p _R corresponding to the R transmission layers. As mentioned earlier, by

The precoding vector corresponding to the rth transmission layer can be determined.

Optionally, the port difference information includes an indication of N-1 coefficients in one of the R feature vectors obtained by performing SVD _{on the R QQ.}

The terminal device may indicate the N-1 coefficients in a certain characteristic vector of the R characteristic vectors, so that the network device can determine the N-1 coefficients applicable to the R transmission layers. In other words, the feature vectors used to determine the precoding vectors of the R transmission layers may be the same. That is, the terminal device can _{uniformly indicate the feature vectors q 1} to q _R corresponding to the R transmission layers, for example, indicate a certain feature vector through the same cell. For the network device, the precoding vector corresponding to each transmission layer can be determined by the feature vector uniformly indicated by the terminal device.

Exemplarily, the terminal device may indicate N-1 coefficients _{in the first q 1 of the R feature vectors.} _{The feature vector q 1} determined by the network device from the N-1 coefficients can be combined with the R feature vectors v ₁ to v _R described above to determine the precoding vector corresponding to the R transmission layers. p ₁ to p _R. As mentioned earlier, by

The precoding vector corresponding to the rth transmission layer can be determined. In this embodiment, q _r can be replaced with q ₁ .

Of course, the terminal device may also indicate other feature vectors in the R feature vectors to the network device to apply to the R transport layers, which is not limited in this application.

Because the indication of a certain feature vector can be used to determine the precoding vector of any one of the R transmission layers. That is, this feature vector can be regarded as q ₁ to q _r corresponding to R transmission layers. Therefore, in a sense, the indication of the feature vector can also be understood as an indication of the R feature vectors from _{q 1} to q _r.

The terminal equipment can indicate various coefficients in many ways. For example, the terminal device can indicate in a normalized manner, or the terminal device can indicate each coefficient by indicating the quantized value of each coefficient or the index of the quantized value, or it can also be a combination of the above two methods To indicate the coefficients, or to indicate the coefficients in other prior art methods. This application does not limit this.

It can be seen that regardless of the number of transmitting antenna ports and receiving antenna ports included in the transmitting antenna unit, the terminal device can convert the channel state information into reference channel state information and port difference information for indication. For example, in the embodiment of the present application, the covariance matrix of the channel may be indicated _{by the indication of R AA and} the indication of R _QQ _{, or the indication of v 1} to v _{R and} the indication of q ₁ to q _{R may be used} . To indicate the precoding vectors corresponding to R transport layers.

Since the indication of the reference channel state information and the indication of the port difference information have been described in detail above in conjunction with multiple possible implementation manners, for the sake of brevity, it will not be repeated here.

It should be noted that in the multiple examples listed above, the reference transmit antenna port may be predefined. For example, the protocol can be predefined, or the network device and the terminal device can negotiate in advance the port number used as the reference transmitting antenna port in each antenna unit. This application does not limit how to determine the reference transmitting antenna port and the port number used as the reference transmitting antenna port.

It should be understood that in the above multiple examples, for ease of understanding and explanation, SVD is used to describe the mathematical transformation process _{of the matrices R AA} , R _{QQ, etc. in many places.} But this should not constitute any limitation to this application. The mathematical transformation of the matrix by the terminal device is the internal realization process of the device, which can be realized through different algorithms. This application does not limit this.

Before generating the reference channel state information and port difference information, the terminal device needs to predetermine the number N of transmit antenna ports in each transmit antenna unit. In the embodiment of the present application, since each transmitting antenna unit may include one reference transmitting antenna port and at least one non-reference transmitting antenna port, N>1 and an integer.

Optionally, the method further includes step 520. The terminal device receives indication information, where the indication information is used to indicate the value of N. Correspondingly, in step 520, the network device sends instruction information, which is used to indicate the value of N.

Among them, N represents the number of transmitting antenna ports included in each transmitting antenna unit.

The network device may, for example, carry the indication information through high-level signaling, and the high-level signaling may include, for example, an RRC message, MAC-CE, etc., to carry the indication information. The network device may also carry the indication information through physical layer signaling, and the physical layer signaling may include, for example, DCI. This application does not limit the specific signaling used to carry the indication information.

In addition, the indication of the N value by the network device may be a direct indication or an indirect indication. For example, the network device may directly indicate the specific value of N; for another example, the network device may indirectly indicate the value of N by indicating the number of transmit antenna units and the total number of transmit ports. This application does not limit the specific manner in which the network device indicates the value of N.

In step 530, the terminal device sends reference channel state information and port difference information. Correspondingly, in step 530, the network device receives reference channel state information and port difference information.

Specifically, the reference channel state information and the port difference information may be carried in the same signaling, or may be carried in different signaling, which is not limited in this application.

In a possible design, the reference channel state information and port difference information can be carried in the CSI report. For example, it may be the information in the PMI reported by the CSI. The CSI report can be carried on the physical uplink resource and transmitted to the network device. The physical uplink resource may be, for example, a physical uplink control channel (PUCCH) resource or a physical uplink shared channel (PUSCH) resource. This application does not limit this.

It should be understood that the specific process of the terminal device sending information to the network device can refer to the prior art. For brevity, a detailed description of the process is omitted here.

In step 540, the network device determines channel state information according to the reference state information and port difference information.

The specific process for the network device to obtain the reference channel state information and port difference information from the information received by the terminal device may correspond to the specific process for the terminal device to generate the reference channel state information and port difference information. The two parties can pre-arrange the indication mode for the reference channel state information and the indication mode for the port difference information, and respectively generate and analyze the information based on the same method.

_{It should be noted that R AA} , R _QQ , R _HH , v _r , q _r , p _r, etc. determined by the network devices listed below based on the analysis of the reference state information and port difference information are the same as those of the terminal in step 510 above _{R AA} , R _QQ , R _HH , v _r , q _r , p _r, etc. determined by the equipment are the same or close. The former is determined based on the quantification and instructions of the latter. The closeness of the two depends largely on the quantization accuracy. Those skilled in the art can understand the difference.

Based on different indication methods for the reference channel state information and port difference information, the network device can obtain the R feature vectors determined by _{the reference channel state information R AA} and N in the _{port difference information R QQ by analyzing the received information.} (N-1)/2 coefficients; R feature vectors from v ₁ to v _{R in} _{the reference channel state information R AA} and R from q ₁ to q _R determined by the port difference information R _{QQ can also be obtained} Feature vector.

_{The network device may determine R AA} according to the reference channel state information sent by the terminal device. It can be understood that the _{determination of R AA} by the network device is equivalent to determining the R feature vectors from v ₁ to v _R _{in R AA.}

For example, if the terminal device indicates R base vectors corresponding to R feature vectors (such as b ₁ to b _R _{above), R AA} determined based on the R base vectors may satisfy the following formula:

R _AA =[b ₁ … b _R ] ^H [b ₁ … b _R ].

If the terminal device further indicates R eigenvalues (or power coefficients) corresponding to R eigenvectors, R _AA determined based on the R basis vectors and R eigenvalues may satisfy the following formula:

For another example, if the terminal device performs the linear superposition and linear superposition of one or more base vectors for each of the R feature vectors (as described above)

to

_{Based on the linear superposition and the determined R AA} of one or more basis vectors indicated by each feature vector, the following formula can be satisfied:

If the terminal device further indicates R eigenvalues (or power coefficients) corresponding to R eigenvectors, it is based on the linear superposition sum of one or more basis vectors indicated by each eigenvector and R _{R AA} determined by the characteristic value can satisfy the following formula:

It should be understood that _{the formulas satisfied by R AA} listed above are only examples and should not constitute any limitation to this application. Those skilled in the art, based on the same concept, can also obtain different ways of determining _{R AA by performing mathematical transformations or equivalent substitutions on the above formulas.} For example, adding coefficients, such as normalization coefficients or correction coefficients, etc.; for another example, defining some coefficients as 0 and so on. For the sake of brevity, I will not list them all here. However, it should be understood that these mathematical transformations or equivalent substitutions should fall within the protection scope of this application.

Network equipment port difference information transmitted from the terminal equipment, R _QQ can be determined in the N (N-1) / 2 coefficients, or may be determined according to the N-1 R _QQ for SVD eigenvalues obtained. It depends on how the terminal device indicates _{R QQ.}

If the port difference information includes an indication of N(N-1)/2 coefficients in _{R QQ} , the network device determines the N(N-1)/2 coefficients _{in R QQ according to the port difference information sent by the terminal device} , It can be further determined that the channel state information is:

Wherein, R _HH may correspond to the covariance matrix H ^{H H of} channel H described in step 510 above. In other words, the channel state information that the network device can determine based on the reference channel state information and the port difference information sent by the terminal device may be the covariance matrix of the channel. After determining the covariance matrix of the channel, the network device may further determine the precoding vector corresponding to each of the R transmission layers.

It should be understood that the covariance matrix of the channel is not limited to determining the precoding vector corresponding to each transmission layer. This application does not limit the operation after the network device determines the covariance matrix of the channel.

If the port difference information includes an indication of N-1 coefficients in each of the R feature vectors from _{q 1} to q _R _{, or an indication of N-1 coefficients in the first feature vector q 1} , then _{The network device determines the R eigenvectors q 1} to q _R obtained by performing SVD _{on R QQ} according to the port difference information sent by the terminal device, and the channel state information can be further determined as:

Where, p _r is a precoding vector corresponding to the rth transmission layer determined by the network device based on the reference channel state information and port difference information indicated by the terminal device. v _r is the rth eigenvector among the R eigenvectors determined by the network device based on the reference channel state information indicated by the terminal device, which may correspond to the rth eigenvector obtained by performing SVD _{on R AA in step 510 above} Feature vector. q _r is the rth eigenvector determined by the _{network device by performing SVD on the R QQ} based on the terminal device's instruction. As mentioned above, q _r can be the r-th eigenvector determined by SVD _{on R QQ} _{, or a eigenvector determined by SVD on R QQ} that is applicable to the precoding vectors of R transmission layers. . This application does not limit this.

In this case, the network device can determine the channel state information based on the reference channel state information and the port difference information sent by the terminal device, which may be a precoding vector corresponding to each transmission layer adapted to the channel.

It should be understood that the specific implementation process and related formulas in which the network device listed above determines the channel state information based on the reference channel state information and port difference information indicated by the terminal device are only examples, and should not constitute any limitation in this application. Those skilled in the art can still determine the channel state information by transforming or replacing the foregoing specific implementation process or formula based on the same concept. However, these changes or replacements should fall within the scope of protection of this application.

In the embodiment of the present application, by defining the reference transmitting antenna port and the non-reference antenna port for the multi-antenna transmitting antenna unit, the receiving device can convert the channel state information into two parts of the reference channel state information and the port difference information to indicate separately. On the one hand, it will not cause excessive instruction overhead, on the other hand, it can also guarantee a certain accuracy. In this way, the transmitting device can determine the channel state information based on the reference channel state information and the port difference information indicated by the receiving device, and then make reasonable decisions for subsequent data transmission, such as determining a precoding matrix adapted to the channel. Therefore, it is beneficial to improve the performance of the communication system.

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 each embodiment. 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 method for indicating and determining channel state information provided by the embodiment of the present application has been described in detail with reference to the figure. Hereinafter, the communication device provided by the embodiment of the present application will be described in detail with reference to the figure.

Fig. 6 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown in FIG. 6, the communication device 600 may include a processing unit 610 and a transceiving unit 620.

In a possible design, the communication device 600 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 600 may correspond to the terminal device in the method 500 according to the embodiment of the present application, and the communication device 600 may include a unit for executing the method executed by the terminal device in the method 500 in FIG. 5. In addition, the units in the communication device 600 and the other operations and/or functions described above are respectively intended to implement the corresponding process of the method 500 in FIG. 5.

Wherein, when the communication device 600 is used to execute the method 500 in FIG. 5, the processing unit 610 can be used to execute step 510 in the method 500, and the transceiver unit 620 can be used to execute step 520 and step 530 in the method 500. 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 600 is a terminal device, the transceiver unit 620 in the communication device 600 may be implemented by a transceiver, for example, it may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. The processing unit 610 in 600 may be implemented by at least one processor, for example, may correspond to the processor 2010 in the terminal device 2000 shown in FIG. 8.

It should also be understood that when the communication device 600 is a component (such as a circuit, a chip, or a chip system, etc.) configured in a terminal device, the transceiver unit 620 in the communication device 600 may be implemented through an input/output interface.

In another possible design, the communication device 600 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 600 may correspond to the network device in the method 500 according to the embodiment of the present application, and the communication device 600 may include a unit for executing the method executed by the network device in the method 500 in FIG. 5. In addition, the units in the communication device 600 and the other operations and/or functions described above are respectively intended to implement the corresponding process of the method 500 in FIG. 5.

Wherein, when the communication device 600 is used to execute the method 500 in FIG. 5, the processing unit 610 can be used to execute step 540 in the method 500, and the transceiver unit 620 can be used to execute step 520 and step 540 in the method 500. 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 600 is a network device, the transceiver unit 620 in the communication device 600 may be implemented by a transceiver, for example, it may correspond to the transceiver 3200 in the network device 3000 shown in FIG. The processing unit 610 in 600 may be implemented by at least one processor, for example, may correspond to the processor 3100 in the network device 3000 shown in FIG. 9.

It should also be understood that when the communication device 600 is a component (such as a circuit, a chip, or a chip system, etc.) configured in a network device, the transceiver unit 620 in the communication device 600 may be implemented through an input/output interface.

FIG. 7 shows a schematic block diagram of another communication device 700 according to an embodiment of the present application. The antenna device 700 includes a processor 710, a transceiver 720, and a memory 730. The processor 710, the transceiver 720, and the memory 730 communicate with each other through an internal connection path. The memory 730 is used to store instructions, and the processor 710 is used to execute the instructions stored in the memory 730 to control the transceiver 720 to send signals and / Or receive the signal.

It should be understood that the communication apparatus 700 may correspond to the network device or 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 the terminal device in the foregoing method embodiment. Optionally, the memory 730 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 730 may be a separate device or integrated in the processor 710. The processor 710 may be used to execute instructions stored in the memory 730, and when the processor 710 executes the instructions stored in the memory, the processor 710 is configured to execute each of the above method embodiments corresponding to the network device or the terminal device. Steps and/or processes.

Optionally, the aforementioned communication apparatus 700 is a communication device, such as the aforementioned network device or terminal device.

The transceiver 720 may include a transmitter and a receiver. The transceiver 720 may further include an antenna, and the number of antennas may be one or more. The processor 710, the memory 730, and the transceiver 720 may be integrated on different chips. For example, the processor 710 and the memory 730 may be integrated in a baseband chip, and the transceiver 720 may be integrated in a radio frequency chip. The processor 710, the memory 730, and the transceiver 720 may also be devices integrated on the same chip. This application does not limit this.

When the communication device 700 is a network device, the communication device 700 may be configured with one or more transmitting antenna units, and each transmitting antenna unit may include multiple transmitting antenna ports.

When the communication device 700 is a terminal device, the communication device 700 may be configured with one or more receiving antenna ports.

Optionally, the aforementioned communication device 700 is a component in a communication device (such as the aforementioned network device or terminal device), such as a chip.

The transceiver 720 in FIG. 7 may also be a communication interface, such as an input/output interface. The transceiver 720, the processor 710 and the memory 720 may be integrated in the same chip, such as integrated in a baseband chip.

When the communication device 700 is a component in a network device, the network device configured with the communication device 700 may be configured with one or more transmitting antenna units, and each transmitting antenna unit may include multiple transmitting antenna ports.

When the communication device 700 is a component in a terminal device, the terminal device configured with the communication device 700 may be configured with one or more receiving antenna ports.

FIG. 8 is a schematic structural diagram of a terminal device 2000 provided by an embodiment of the present application. The terminal device 2000 can be applied to the 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 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further includes a memory 2030. Among them, the processor 2010, the transceiver 2002, and the memory 2030 can communicate with each other through an internal connection path to transfer control and/or data signals. The memory 2030 is used for storing computer programs, and the processor 2010 is used for downloading from the memory 2030. Call and run the computer program to control the transceiver 2020 to send and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for transmitting the reference channel state information and port difference information output by the transceiver 2020 through a wireless signal.

The above-mentioned processor 2010 and the memory 2030 may be combined into a processing device, and the processor 2010 is configured to execute the program code stored in the memory 2030 to realize the above-mentioned functions. During specific implementation, the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010. The processor 2010 may correspond to the processing unit 610 in FIG. 6 or the processor 710 in FIG. 7.

The above-mentioned transceiver 2020 may correspond to the transceiver unit 620 in FIG. 6, or may also correspond to the transceiver 720 in FIG. 7. The transceiver 2020 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 2000 shown in FIG. 8 can implement various processes involving the terminal device in the method embodiment shown in FIG. 5. The operations and/or functions of each module in the terminal device 2000 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 2010 can be used to execute the actions described in the previous method embodiments implemented by the terminal device, and the transceiver 2020 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 2000 may further include a power supply 2050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the function of the terminal device more complete, the terminal device 2000 may also include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, and a sensor 2100. The audio circuit It may also include a speaker 2082, a microphone 2084, and so on.

FIG. 9 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 3000. The base station 3000 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 3000 may include one or more radio frequency units, such as a remote radio unit (RRU) 3100 and one or more baseband units (BBU) (also known as distributed unit (DU) )) 3200. The RRU 3100 may be referred to as a transceiver unit, which corresponds to the transceiver unit 620 in FIG. 6 or corresponds to the transceiver 720 in FIG. 7. Optionally, the transceiver unit 3100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 3101 and a radio frequency unit 3102. Optionally, the transceiver unit 3100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter or transmitting circuit). The RRU 3100 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals to baseband signals, for example, for sending instruction information to terminal equipment. The 3200 part of the BBU is mainly used for baseband processing, control of the base station, and so on. The RRU 3100 and the BBU 3200 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 3200 is the control center of the base station, and may also be called a processing unit. It may correspond to the processing unit 610 in FIG. 6 or the processor 710 in FIG. 7, and is mainly used to complete baseband processing functions, such as channel coding. , 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, or to determine the channel state information.

In an example, the BBU 3200 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) of a single access standard, or support different access standards. Wireless access network (such as LTE network, 5G network or other networks). The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is configured to control the 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 3201 and the processor 3202 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 3000 shown in FIG. 9 can implement various processes involving network devices in the method embodiment shown in FIG. 5. The operations and/or functions of the various modules in the base station 3000 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 3200 can be used to perform the actions described in the previous method embodiments implemented by the network device, and the RRU 3100 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 3000 shown in FIG. 9 is only a possible architecture of the network device, and should not constitute any limitation in this application. The method provided in this application can be applied to network devices of other architectures. For example, network equipment including CU, DU, and AAU. This application does not limit the specific architecture of the network device.

An embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute a method executed by a terminal device or a network device in any of the foregoing method embodiments.

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.

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 execution and completion by a hardware processor, or execution and completion 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 by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the embodiment shown in FIG. 5 In the method.

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 the program shown in FIG. 5 The method executed by the terminal device or the network device in the embodiment.

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 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.

In the foregoing embodiments, the functions of each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.

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 disks or optical disks and other media that can store program codes. .

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 method for indicating channel state information, characterized in that the method is applied to a system including a transmitting device and a receiving device, the transmitting device includes one or more transmitting antenna units, and each transmitting antenna unit includes multiple transmitting antennas. An antenna port, the multiple transmitting antenna ports include a reference transmitting antenna port and at least one non-reference transmitting antenna port, the receiving device includes one or more receiving antenna ports, a reference transmitting antenna port and a receiving antenna port form one For a reference transmission channel, the method includes:

Generate reference channel state information and port difference information, where the reference channel state information is obtained based on at least one reference transmission channel, and the port difference information is used to indicate the difference between the reference transmit antenna port and the non-reference transmit antenna port in each transmit antenna unit The difference in radiation characteristics;

Sending the reference channel state information and the port difference information.
The method according to claim 1, wherein the port difference information of the multiple transmitting antenna units is the same.
The method of claim 2, wherein each transmit antenna unit includes N transmit antenna ports, and the port difference information includes an indication of N(N-1)/2 coefficients, where N>1 and is Integer.
The method according to claim 2, wherein each transmit antenna unit includes N transmit antenna ports, and the port difference information includes an indication of R group coefficients corresponding to each of the R transmission layers, Each set of coefficients includes N-1 coefficients, R≥1, N>1, and R and N are integers.
The method according to any one of claims 1 to 4, wherein the reference channel state information is specifically used to indicate R vectors corresponding to R transmission layers, and R is a positive integer.
The method according to claim 5, wherein the rth vector among the R vectors is used to determine the precoding vector corresponding to the rth transmission layer in the R transmission layers, and 1≤r ≤R, r is a positive integer.
The method according to claim 5 or 6, wherein the R vectors are R basis vectors in a predefined basis vector set, and the reference channel state information includes a reference to all the basis vectors in the basis vector set. The indication of the R basis vectors.
The method according to claim 5 or 6, wherein each of the R vectors is a linear superposition sum of one or more basis vectors in a predefined basis vector set, and the reference channel state The information includes an indication of one or more basis vectors and their linear superposition coefficients corresponding to each of the R vectors.
The method according to claim 7 or 8, wherein the reference channel state information is further used to indicate at least one power coefficient, and the at least one power coefficient is used to indicate the power ratio between the vectors corresponding to each transmission layer .
The method according to any one of claims 1 to 9, wherein the method further comprises:

Receive instruction information, where the instruction information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.
A method for determining channel state information, characterized in that the method is applied to a system including a transmitting device and a receiving device. The transmitting device includes one or more transmitting antenna units, and each transmitting antenna unit includes multiple transmitting antennas. An antenna port, the multiple transmitting antenna ports include a reference transmitting antenna port and at least one non-reference transmitting antenna port, the receiving device includes one or more receiving antenna ports, a reference transmitting antenna port and a receiving antenna port form one For a reference transmission channel, the method includes:

Receive reference channel state information and port difference information, where the reference channel state information is obtained based on at least one reference transmission channel, and the port difference information is used to indicate the difference between the reference transmit antenna port and the non-reference transmit antenna port in each transmit antenna unit The difference in radiation characteristics;

The channel state information is determined according to the reference channel state information and the port difference information.
The method according to claim 11, wherein the port difference information of the multiple transmitting antenna units is the same.
The method according to claim 12, wherein each transmit antenna unit includes N transmit antenna ports, and the port difference information includes an indication of N(N-1)/2 coefficients, where N>1 and is Integer.
The method according to claim 12, wherein each transmitting antenna unit includes N transmitting antenna ports, and the port difference information includes an indication of R group coefficients corresponding to each of the R transmission layers, Each set of coefficients includes N-1 coefficients, R≥1, N>1, and R and N are integers.
The method according to any one of claims 11 to 14, wherein the reference channel state information is specifically used to indicate R vectors corresponding to R transmission layers, and R is a positive integer.
The method according to claim 15, wherein the rth vector among the R vectors is used to determine the precoding vector corresponding to the rth transmission layer in the R transmission layers, and 1≤r ≤R, r is a positive integer.
The method according to claim 15 or 16, wherein the R vectors are R basis vectors in a predefined basis vector set, and the reference channel state information includes a reference to all the basis vectors in the basis vector set. The indication of the R basis vectors.
The method according to claim 15 or 16, wherein each of the R vectors is a linear superposition sum of one or more basis vectors in a predefined basis vector set, and the reference channel state The information includes an indication of one or more basis vectors and their linear superposition coefficients corresponding to each of the R vectors.
The method according to claim 17 or 18, wherein the reference channel state information is further used to indicate at least one power coefficient, and the at least one power coefficient is used to indicate the power ratio between the vectors corresponding to each transmission layer .
The method according to any one of claims 11 to 19, wherein the method further comprises:

Send instruction information, where the instruction information is used to indicate the number N of transmit antenna ports of each transmit antenna unit.
A communication device, characterized by comprising a unit for executing the method according to any one of claims 1 to 10.
A communication device, characterized by comprising a unit for executing the method according to any one of claims 11 to 20.
A communication device, characterized in that it comprises at least one processor, and the at least one processor is used to execute a computer program stored in a memory, so that the communication device implements any one of claims 1 to 10 method.
A communication device, characterized in that, a communication device, characterized in that it comprises at least one processor, and the at least one processor is configured to execute a computer program stored in a memory, so that the communication device realizes the following To the method of any one of 20.
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 10.
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 11 to 20.