Communication method and communication apparatus

Abstract

The present application provides a communication method and a communication apparatus. The communication method comprises: a terminal device receives a first reference signal from a network device on a first working frequency band, and on the basis of the first reference signal, determines first channel state information and reports same to the network device. In addition, the terminal device receives first instruction information for instructing to activate at least one working frequency band, and receives a second reference signal on a second working frequency band, the second working frequency band comprising at least one newly activated working frequency band and the activated first working frequency band. The terminal device, on the basis of the second reference signal, reports second channel state information, the second channel state information being associated with the first channel state information. In the communication method, when the terminal device reports the channel state information for the newly activated working frequency band, the reported channel state information for the activated working frequency band is considered, such that the amount of reported information is reduced, and therefore the empty interface resource overhead is reduced.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202311289764.2 and application name “Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of communications, and in particular to a communication method and a communication device. Background Art

[0003] The channel state measurement involved in the new radio (NR) system includes: the network device sends a channel state information reference signal (CSI-RS) to the terminal device, and the terminal device can report channel state information (CSI) based on the measurement result of the CSI-RS to realize the measurement of the channel between the network device and the terminal device.

[0004] Specifically, the CSI reported by the terminal device includes information such as the Precoding Matrix Indictor (PMI). Among them, PMI is obtained by quantizing the channel information measured by the terminal device based on the CSI-RS through the codebook. The PMI feedback of terminal devices using different codebooks is also different. When a new working frequency band is activated, the terminal device needs to report the channel information for the newly activated working frequency band through CSI, and the PMI feedback overhead is large. Therefore, how to reduce the overhead of PMI feedback in the scenario of activating a new working frequency band has become an urgent problem to be solved.

[0005] Summary of the Invention

[0006] The present application provides a communication method, so as to reduce the feedback overhead of channel state information for a newly activated working frequency band in the scenario of activating a new working frequency band.

[0007] In a first aspect, a communication method is provided. The method may be executed by a terminal device or by a component (such as a chip or circuit) of the terminal device. This application does not limit this.

[0008] The communication method includes: receiving a first reference signal on a first working frequency band; reporting first channel state information based on the first reference signal; receiving first indication information, wherein the first indication information is used to indicate activation of at least one working frequency band other than the first working frequency band; receiving a second reference signal on a second working frequency band, wherein the second working frequency band includes the at least one working frequency band and the first working frequency band; and reporting second channel state information based on the second reference signal, wherein the first channel state information and the second channel state information are associated.

[0009] Based on the above technical solution, the terminal device receives a first reference signal from the network device on the first working frequency band, and based on the first reference signal, determines the first channel state information to be reported to the network device. In addition, the terminal device receives a first indication information for indicating the activation of at least one working frequency band, and receives a second reference signal on the second working frequency band, and the second working frequency band includes at least one newly activated working frequency band and the activated first working frequency band. The terminal device reports the second channel state information based on the second reference signal, and the second channel state information is associated with the first channel state information. In this technical solution, the channel state information reported by the terminal device for the newly activated working frequency band is related to the channel state information already reported by the terminal device for the activated working frequency band, so that when the terminal device reports the channel state information for the newly activated working frequency band, the channel state information already reported for the activated working frequency band is taken into account, and the amount of information reported is reduced, thereby reducing the air interface resource overhead.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information and the second channel state information are associated, including: the parameter type included in the second channel state information is a subset, or a true subset, of the parameter type included in the first channel state information.

[0011] Based on the above technical solution, the types of parameters included in the second channel state information reported by the terminal device for the newly activated working frequency band can be a subset or a true subset of the types of parameters included in the first channel state information for the activated working frequency band that has been reported by the terminal device, that is, the types of parameters included in the second channel state message can be less than the types of parameters included in the first channel state information, thereby reducing the amount of information included in the second channel state information, and reducing the air interface resource overhead in the scenario of reporting channel state information for the newly activated working frequency band.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes two types of information, namely, spatial domain information and frequency domain information in the spatial domain information and frequency domain information corresponding to the first working frequency band, and the second channel state information includes one type of information, namely, frequency domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band.

[0013] Based on the above technical solution, the second channel state information reported by the terminal device for the newly activated working frequency band may include one type of information indicating the frequency domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band, while the first channel state information for the activated working frequency band already reported by the terminal device includes two types of information, namely, the spatial domain information and frequency domain information in the spatial domain information and frequency domain information corresponding to the first working frequency band. In comparison, the second channel state information may not carry the spatial domain information corresponding to the second working frequency band, thereby reducing the amount of information included in the second channel state information. In the scenario of reporting channel state information for the newly activated working frequency band, the air interface resource overhead is reduced.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the subband amplitude corresponding to the first working frequency band, and information indicating the subband phase corresponding to the first working frequency band, and the second channel state information includes information indicating the subband amplitude corresponding to the second working frequency band and information indicating the subband phase corresponding to the second working frequency band.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, and information indicating the subband phase corresponding to the first working frequency band, and the second channel state information includes information indicating the subband phase corresponding to the second working frequency band.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes three types of information, namely, spatial domain information, frequency domain information, and delay change domain information corresponding to the first working frequency band; the second channel state information includes one type of information, namely, delay change domain information, among the spatial domain information, frequency domain information, and delay change domain information corresponding to the second working frequency band.

[0017] Based on the above technical solution, the second channel state information reported by the terminal device for the newly activated working frequency band may include one type of information indicating the delay change domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band, while the first channel state information for the activated working frequency band already reported by the terminal device includes three types of information, namely, spatial domain information, frequency domain information and delay change domain information corresponding to the first working frequency band. In comparison, the second channel state information may not carry the spatial domain information corresponding to the second working frequency band, thereby reducing the amount of information included in the second channel state information. In the scenario of reporting channel state information for the newly activated working frequency band, the air interface resource overhead is reduced.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the delay change domain basis vectors corresponding to the first working frequency band, information indicating the delay change domain basis vector amplitude corresponding to the first working frequency band, and information indicating the delay change domain basis vector phase corresponding to the first working frequency band; the second channel state information includes information indicating the delay change domain basis vectors corresponding to the second working frequency band, information indicating the delay change domain basis vector amplitude corresponding to the second working frequency band, and information indicating the delay change domain basis vector phase corresponding to the second working frequency band.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, first information indicating the delay change domain basis vectors corresponding to the first working frequency band, second information indicating the delay change domain basis vector amplitude corresponding to the first working frequency band, and third information indicating the delay change domain basis vector phase corresponding to the first working frequency band; the second channel state information includes the difference between the delay change domain basis vector corresponding to the second working frequency band and the first information, the difference between the delay change domain basis vector amplitude corresponding to the second working frequency band and the second information, and the difference between the delay change domain basis vector phase corresponding to the second working frequency band and the third information.

[0020] Based on the above technical solution, the second channel state information reported by the terminal device for the newly activated working frequency band may include information indicating the delay change domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band, and the delay change domain information may be differential information from the delay change domain information included in the first channel state information, further reducing the air interface resource overhead.

[0021] In a second aspect, a communication method is provided. The method may be executed by a network device or by a component (such as a chip or circuit) of the network device. This application does not limit this.

[0022] The communication method includes: sending a first reference signal on a first working frequency band, where the first reference signal is used to determine first channel state information corresponding to the first working frequency band; receiving the first channel state information; sending first indication information, where the first indication information is used to indicate activation of at least one working frequency band other than the first working frequency band; sending a second reference signal on a second working frequency band, where the second reference signal is used to determine channel state information corresponding to the second working frequency band, where the second working frequency band includes the at least one working frequency band and the first working frequency band; and receiving second channel state information, where the first channel state information and the second channel state information are associated.

[0023] Specifically, for the description related to the first channel state information and the second channel information, reference may be made to the description on the first channel state information and the second channel information in the first aspect and no further details are given here.

[0024] The technical effects of the method shown in the above second aspect and its possible design can refer to the technical effects in the first aspect and its possible design.

[0025] In a third aspect, a terminal device is provided. A first device is configured to execute the first aspect and any one of its embodiments. Specifically, the terminal device includes a processor and a memory, the memory being configured to store a computer program; the processor being configured to retrieve and execute the computer program from the memory, so that the terminal device executes the first aspect and any one of its embodiments.

[0026] In a fourth aspect, a network device is provided. The network device is configured to execute the second aspect and any one of its embodiments. Specifically, the network device includes a processor and a memory, the memory being configured to store a computer program; the processor being configured to retrieve and execute the computer program from the memory, so that the network device executes the second aspect and any one of its embodiments.

[0027] In a fifth aspect, a communication device is provided. The communication device is configured to perform the methods provided in the first and second aspects above, and any of their embodiments. Specifically, the communication device may include units and / or modules (e.g., processing units, transceiver units) configured to perform the methods provided in the first and second aspects above, and any of their embodiments.

[0028] In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the transceiver unit may be a transceiver or an input / output interface. The processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input / output interface may be an input / output circuit.

[0029] In another implementation, the communication device may be a chip, chip system, or circuit in a terminal device. In this case, the transceiver unit may be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; and the processing unit may be at least one processor, processing circuit, or logic circuit.

[0030] In a sixth aspect, the present application provides a processor for executing the methods provided in the first and second aspects above.

[0031] For the operations such as sending and acquiring / receiving involved in the processor, unless otherwise specified, or if they do not conflict with their actual functions or internal logic in the relevant descriptions, they can be understood as processor output, reception, input and other operations, and can also be understood as sending and receiving operations performed by the radio frequency circuit and antenna. This application does not limit this.

[0032] In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, which, when executed on a communication device, causes the communication device to execute the method of any one of the implementations of the first and second aspects.

[0033] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, causes the computer to execute the method provided in any one of the implementations of the first and second aspects.

[0034] In a ninth aspect, a chip is provided, which includes a processor and a communication interface. The processor reads instructions through the communication interface and executes the method provided by any one of the implementations of the first and second aspects.

[0035] Optionally, as an implementation method, the chip also includes a memory, the memory stores a computer program or instructions, and the processor is used to execute the computer program or instructions stored in the memory. When the computer program or instructions are executed, the processor is used to execute the method provided by any one of the implementation methods of the first and second aspects above.

[0036] In the tenth aspect, a communication system is provided, comprising the terminal device of the third aspect and the network device of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of a communication system to which the present application is applicable.

[0038] FIG2 is a schematic flowchart of a communication method provided in an embodiment of the present application.

[0039] FIG3 is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0040] FIG4 is a schematic diagram of another communication device provided in an embodiment of the present application.

[0041] FIG5 is a schematic diagram of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to facilitate understanding of the embodiments of the present application, the following explanations are made.

[0043] First, in this application, "used to indicate" can include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used to indicate A, it can include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must include A.

[0044] The information indicated by the indication information is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. The information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and / or sending time of these sub-information can be predefined, for example, predefined according to the protocol, or configured by the transmitting device by sending configuration information to the receiving device. Among them, the configuration information can be, but is not limited to, one or a combination of at least two of radio resource control (RRC) signaling, medium access control (MAC) layer signaling and physical layer signaling. Among them, MAC layer signaling, for example, includes a MAC control unit (CE); physical layer signaling, for example, includes downlink control information (DCI).

[0045] Second, "at least one" shown in the present application refers to one or more, and "a plurality of" refers to two or more. In addition, in the embodiments of the present application, "first", "second" and various digital numbers (for example, "#1", "#2", etc.) are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of each process below does not mean the order of execution. The execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. It should be understood that the objects described in this way can be interchanged where appropriate, so that solutions other than the embodiments of the present application can be described. In addition, in the embodiments of the present application, words such as "S210", "S220" are only for the convenience of description and are not used to limit the order of execution of steps.

[0046] Third, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] Fourth, the term "storage" used in the embodiments of this application may refer to storage in one or more memories. The one or more memories may be provided separately or integrated into an encoder or decoder, a processor, or a communication device. The one or more memories may also be provided in part separately and in part integrated into a decoder, a processor, or a communication device. The memory may be any type of storage medium, and this application is not limited thereto.

[0048] Fifth, the "protocol" involved in the embodiments of the present application may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems. This application does not limit this.

[0049] Sixth, in the embodiments of the present application, "under the circumstances", "when", and "if" can sometimes be used interchangeably. It should be pointed out that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

[0050] Seventh, in the embodiments of this application, various terms and English abbreviations, such as radio resource control (RRC), are provided for ease of description and should not constitute any limitation on this application. This application does not exclude the possibility of defining other terms in existing or future protocols that can achieve the same or similar functions.

[0051] Eighth, the term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0052] The technical solution in this application will be described below with reference to the accompanying drawings.

[0053] The technical solutions of the embodiments of the present application can be applied to various communication systems. For example: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in the present application can also be applied to future communication systems, such as the sixth generation mobile communication system. The technical solutions of the embodiments of the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication system or other communication systems.

[0054] The terminal equipment in the embodiments of the present application may refer to an access terminal, a user unit, a user station, a mobile station, a mobile station, a relay station, a remote station, a remote terminal, a mobile device, a user terminal, a user equipment (UE), a terminal, a wireless communication device, a user agent, or a user device. The terminal equipment may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network, a terminal device in a future evolved public land mobile network (PLMN), or a terminal device in a future Internet of Vehicles, etc., and the embodiments of the present application are not limited thereto.

[0055] For example, in the embodiments of the present application, wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear. Such as glasses, gloves, watches, clothing and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured devices that can achieve complete or partial functions without relying on smartphones. For example: smart watches or smart glasses. In addition, it can also be a portable device that only focuses on a certain type of application function and needs to be used in conjunction with other devices such as smartphones. Such as various smart bracelets and smart jewelry for vital sign monitoring.

[0056] Furthermore, in the embodiments of the present application, the terminal device may also be a terminal device in an IoT system. IoT is an important component of future information technology development. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network that interconnects humans and machines, and objects and things. In the embodiments of the present application, IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrowband (NB) technology.

[0057] In addition, in an embodiment of the present application, the terminal device may also include a sensor, whose main functions include collecting data (part of the terminal device), receiving control information and downlink data from the network device, and sending electromagnetic waves to transmit uplink data to the network device.

[0058] The network device in the embodiment of the present application can be any communication device with wireless transceiver functions for communicating with a terminal device. The device includes but is not limited to: an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a home evolved Node B (HeNB, or home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc., and can also be a 5G system, such as a gNB in ​​an NR system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), etc.

[0059] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0060] In the embodiment of the present application, the terminal device or network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, for example, operating system, operating system, operating system, Operating system or Operating system, etc. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

[0061] In addition, various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier, or medium. For example, computer-readable media include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0062] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application will first be described in detail using the communication system shown in FIG1 as an example. As shown in FIG1 , the communication system 100 may include at least one network device 101 and at least one terminal device 102 to 107. Terminal devices 102 to 107 may be mobile or fixed. Network device 101 and one or more of terminal devices 102 to 107 may communicate via wireless links. Each network device may provide communication coverage for a specific geographic area and may communicate with terminal devices within that coverage area.

[0063] Optionally, terminal devices can communicate directly with each other. For example, direct communication between terminal devices can be achieved using device-to-device (D2D) technology. As shown in Figure 1, terminal devices 105 and 106, and terminal devices 105 and 107 can communicate directly using D2D technology. Terminal devices 106 and 107 can communicate with terminal device 105 individually or simultaneously.

[0064] Terminal devices 105 to 107 may also communicate with network device 101. For example, they may communicate directly with network device 101, as shown in the figure, where terminal devices 105 and 106 may communicate directly with network device 101. They may also communicate indirectly with network device 101, as shown in FIG1 , where terminal device 107 communicates with network device 101 via terminal device 105.

[0065] Each communication device can be configured with multiple antennas. For each communication device in communication system 100, the multiple antennas configured may include at least one transmit antenna for sending signals and at least one receive antenna for receiving signals. Therefore, communication devices in communication system 100 can communicate with each other using multi-antenna technology.

[0066] The interface between the network device and the terminal device can be a Uu interface (or air interface). Of course, in future communications, the names of these interfaces may remain unchanged, or may be replaced by other names, and this application is not limited to this. For example, the communication between the network device and the terminal device follows a certain protocol layer structure. The network layering is to send, forward, package or unpack data of the network nodes (such as network devices and terminal devices), and control the loading or unpacking of information, etc., which are completed by different hardware and software modules respectively. This can make the complex problem of communication and network interconnection simpler.

[0067] It should be understood that Figure 1 is merely a simplified schematic diagram for ease of understanding, and the communication system 100 may also include other network devices or other terminal devices (not shown in Figure 1). For example, the communication system 100 may also include core network devices. On the one hand, the access network device provides wireless access connections for terminal devices and can send data to or receive data from terminal devices. On the other hand, the access network device also has a connection with the core network device and can forward data received from the terminal device to the core network, or receive data from the core network that needs to be sent to the terminal device.

[0068] For example, the communication system 100 may further include an application function (AF) network element, which is a control plane network function provided by the operator network and is used to provide application layer information; the communication system 100 may further include a session management function (SMF) network element, which is a control plane network function provided by the operator network. In the embodiment of the present application, when the communication system 100 includes the AF network element and the SMF network element, the AF can send service-related information to the network device via the SMF.

[0069] To facilitate understanding of the embodiments of the present application, some basic concepts involved in the present application are briefly described. It should be understood that the basic concepts introduced below are illustrated by taking the basic concepts specified in the NR protocol as an example, but the embodiments of the present application are not limited to being applicable only to NR systems. Therefore, the standard names that appear when describing the NR system as an example are all functional descriptions. The specific names are not limited and only indicate the functions of the device, which can be extended to other systems in the future.

[0070] 1. Precoding technology: When the channel state is known, the network device can process the signal to be transmitted with the help of a precoding matrix that matches the channel state, so that the precoded signal to be transmitted is adapted to the channel, thereby reducing the complexity of the receiving device in eliminating the influence between channels. Therefore, by precoding the signal to be transmitted, the quality of the received signal (such as signal to interference plus noise ratio (SINR)) is improved. Therefore, by adopting the precoding technology, the transmitting device and multiple receiving devices can be transmitted on the same time-frequency resources, that is, multiple user multiple input multiple output (MU-MIMO) is realized. It should be understood that the relevant description of the precoding technology in this article is only for ease of understanding and is not intended to limit the scope of protection of the embodiments of the present application. In the specific implementation process, the transmitting device can also perform precoding in other ways. For example, when the channel information (such as but not limited to the channel matrix) cannot be obtained, a pre-set precoding matrix or a weighted processing method is used for precoding. For the sake of brevity, its specific content is not repeated here.

[0071] 2. Precoding matrix indicator (PMI): used to indicate the precoding matrix. The precoding matrix can be, for example, a precoding matrix determined by the terminal device based on the channel matrix of each frequency domain unit. The precoding matrix can be determined by the terminal device through channel estimation or other methods or based on channel reciprocity. However, it should be understood that the specific method for the terminal device to determine the precoding matrix is ​​not limited to the above. The specific implementation method can refer to the existing technology. For the sake of brevity, they are not listed here one by one.

[0072] For example, the precoding matrix can be obtained by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix, or by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix. It should be understood that the methods for determining the precoding matrix listed above are only examples and should not constitute any limitation to this application. The methods for determining the precoding matrix can refer to the prior art and are not listed here for the sake of brevity.

[0073] The precoding matrix determined by the terminal device can be referred to as the precoding matrix to be fed back, or in other words, the precoding matrix to be reported. The terminal device can indicate the precoding matrix to be fed back through the PMI, so that the network device can recover the precoding matrix based on the PMI. The precoding matrix recovered by the network device based on the PMI can be the same as or similar to the precoding matrix to be fed back.

[0074] In downlink channel measurement, the higher the degree of similarity between the precoding matrix determined by the network device based on the PMI and the precoding matrix determined by the terminal device, the more adaptable the precoding matrix determined by the network device for data transmission will be to the downlink channel, thereby improving the signal transmission quality.

[0075] It should be understood that PMI is only a name and should not constitute any limitation to this application. This application does not exclude the possibility of defining signaling with other names in future protocols for the same or similar functions.

[0076] 3. Reference signal (RS)

[0077] RS may also be referred to as a pilot, a reference sequence, etc. In an embodiment of the present application, a reference signal may be a reference signal for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI-RS) for downlink channel measurement, or a sounding reference signal (SRS) for uplink channel measurement. It should be understood that the reference signals listed above are only examples and should not constitute any limitation to the present application. The present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0078] In addition, it should be noted that if there is reciprocity between channels, the above-mentioned CSI-RS and / or SRS can also be understood as reference signals for channel measurement. The CSI-RS referred to below in this application can be understood as a reference signal for channel measurement, and no distinction is made between specific uplink channel measurement and downlink channel measurement.

[0079] 4. Codebook: The codebook referred to in the embodiments of this application may refer to a set of time-domain vectors. Multiple time-domain vectors in the same codebook may be vectors of the same dimension. For example, if all time-domain vectors in the same codebook are M-dimensional vectors, then the codebook is an M-dimensional codebook.

[0080] Optionally, all time-domain vectors in the same codebook are DFT vectors. The codebook may include M time-domain vectors, and each of the M time-domain vectors may be orthogonal to each other. In other words, the codebook is an orthogonal codebook, and the M time-domain vectors in the codebook may be used to construct a DFT matrix. Alternatively, the time-domain vectors may be vectors derived from a DFT matrix.

[0081] For example, the M time-domain vectors in an M-dimensional codebook may be vectors taken from a discrete Fourier transform (DFT) matrix of dimension M×M. The mth (m=0, 1, ..., M-1) vector in the M-dimensional codebook may be, for example: [e-j2π×0×m / M e-j2π×1×m / M ... e-j2π×(N-1)×m / M] T .

[0082] It should be understood that the vectors shown above are only examples and should not constitute any limitation to the present application. The present application does not limit the specific form of the time domain vector.

[0083] Optionally, the time domain vectors in the same codebook are all oversampled DFT vectors. The oversampled DFT vectors may refer to vectors in the oversampled DFT matrix. For example, the above-mentioned orthogonal codebook composed of DFT vectors can be expanded into multiple subsets by the oversampling factor Ot (Ot is a positive integer greater than 1). Each subset may include M time domain vectors, and the M time domain vectors are mutually orthogonal to each other. The time domain vectors in the multiple subsets can construct an oversampled DFT matrix. The sum (or union) of the multiple subsets can be defined as a codebook. The above-mentioned time domain vectors may be vectors taken from multiple subsets, or vectors taken from a subset of multiple subsets. This application does not limit this.

[0084] It should be understood that when the orthogonal codebook composed of the DFT vectors is expanded into multiple orthogonal subsets through an oversampling factor, the multiple orthogonal subsets can also be defined as multiple codebooks, which is not limited in this application.

[0085] The codebooks involved in this application include but are not limited to: Type 2 (Type-2) codebook and Enhanced Type-2 (Enhanced Type-2) codebook. The definitions of Type-2 codebook and Enhanced Type-2 codebook can refer to the definitions in the current relevant protocols, which are not described in detail in this application.

[0086] 5. Channel Measurement: Channel measurement between a network device and a terminal device involves the network device sending a CSI-RS signal to the terminal device for channel measurement. Upon receiving the CSI-RS signal, the terminal device reports the CSI based on the CSI-RS measurement results. The reported CSI includes the PMI. The PMI is channel information obtained by the terminal device based on CSI-RS measurement, quantized using a codebook. Terminal devices using different codebooks will report different PMIs.

[0087] For example, if the terminal device uses the Type-2 codebook to quantize the channel information obtained based on the CSI-RS measurement, the PMI in the channel state information reported by the terminal device includes the following information:

[0088] The parameter i indicating the beam in the spatial domain 1,1 and i 1,2 , parameter i indicating the strongest beam per transmission stream 1,3,l ; Parameter i indicating the beam width amplitude in the frequency domain 1,4,l , and the parameter i indicating the beam subband amplitude phase 2,2,l and i 2,1,l Specifically, the parameter i 1,1 、i 1,2 、i 1,3,l 、i 1,4,l 、i 2,2,l and i 2,1,l The definition and determination method of may refer to the description in the existing protocol (eg, 3GPP TS 38.214 5.2.2.2.3), which will not be described in detail here.

[0089] For example, if the terminal device uses the Enhanced Type-2 codebook to quantize the channel information obtained based on the CSI-RS measurement, the PMI in the channel state information reported by the terminal device includes the following information:

[0090] The parameter i indicating the beam in the spatial domain 1,1 and i 1,2 , parameter i indicating the strongest beam per transmission stream 1,8,l ; Parameter i indicating the beam width amplitude in the frequency domain 2,3,l ; Parameter i indicating the channel multipath position in the delay variation domain 1,5,l 、i 1,6,l and i 1,7,l , and the parameter i indicating the channel multipath amplitude and phase 2,4,l and i 2,5,l Specifically, the parameter i 1,1 、i 1,2 、i 1,8,l 、i 2,3,l 、i 1,5,l、i 1,6,l 、i 1,7,l 、i 2,4,l and i 2,1,l The definition and determination method of may refer to the description in the existing protocol (eg, 3GPP TS 38.214 5.2.2.2.5), which will not be described in detail here.

[0091] The above, in combination with Figure 1, briefly introduces the scenarios in which the communication method provided in the embodiment of the present application can be applied, as well as the basic concepts that may be involved in the embodiment of the present application. The channel measurement process defined in the existing standard is introduced in the basic concepts. When a new working frequency band is activated, the terminal device needs to report the channel information for the newly activated working frequency band through CSI. If the channel measurement process introduced in the above basic concepts is followed, the terminal device can perform CSI feedback based on different codebooks. The problem is that the PMI feedback overhead for the newly activated working frequency band is large, and the PMI feedback amount will occupy more air interface resources.

[0092] In order to solve the problem of high PMI feedback overhead caused by directly applying the channel measurement specified in the existing protocol in the scenario of activating a new working frequency band, the present application provides a communication method, which reduces the PMI feedback overhead for the newly activated bandwidth by designing the information included in the PMI fed back by the terminal device in the scenario of activating a new working frequency band.

[0093] It should be understood that the communication method provided in the embodiments of the present application can be applied to a system that communicates using multi-antenna technology, such as the communication system 100 shown in Figure 1. The communication system may include at least one network device and at least one terminal device. The network device and the terminal device can communicate using multi-antenna technology.

[0094] It should also be understood that the embodiments shown below do not specifically limit the specific structure of the execution subject of the method provided in the embodiments of the present application. As long as it is possible to communicate according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application. For example, the execution subject of the method provided in the embodiments of the present application can be a terminal device and a network device, or a functional module in the terminal device and the network device that can call and execute the program.

[0095] FIG2 is a schematic flow chart of a communication method provided by the present application. The method includes the following steps:

[0096] S210: The network device sends a first reference signal to the terminal device, or in other words, the terminal device receives the first reference signal from the network device.

[0097] Specifically, in this embodiment, the network device sends a first reference signal to the terminal device on a first working frequency band, where the first reference signal is used to measure channel state information between the terminal device and the network device corresponding to the first working frequency band.

[0098] In this embodiment, the first working frequency band may be understood as an activated working frequency band.

[0099] Exemplarily, the first reference signal is the CSI-RS shown above, or the first reference signal is other signals capable of implementing channel measurement. This embodiment does not impose any limitation on the specific form of the first reference signal.

[0100] Furthermore, after receiving the first reference signal, the terminal device can measure information about the channel between the terminal device and the network device corresponding to the first operating frequency band based on the first reference signal to determine the first channel state information. The method flow shown in FIG2 further includes:

[0101] S220: The terminal device performs channel measurement based on the first reference signal to determine first channel state information.

[0102] This embodiment does not limit the process of how the terminal device performs channel measurement based on the received first reference signal. Reference may be made to the description of the terminal device performing channel measurement based on the reference signal in the existing related art.

[0103] The terminal device reports the channel state information based on the measurement result of the first reference signal, and the method flow shown in FIG2 further includes:

[0104] S230: The terminal device sends first channel state information to the network device, or in other words, the network device receives the first channel state information from the terminal device.

[0105] The first channel state information includes a first PMI, which is used to indicate a first precoding matrix, so that the network device can process the signal to be transmitted based on the first precoding matrix, so that the precoded signal to be transmitted is adapted to the channel, thereby reducing the complexity of the receiving device in eliminating the influence between channels.

[0106] As a possible implementation manner, the first PMI is obtained by the terminal device through quantization based on a first codebook.

[0107] In this implementation, the first channel state information includes spatial domain information and frequency domain information corresponding to the first working frequency band.

[0108] For example, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the subband amplitude corresponding to the first working frequency band, and information indicating the subband phase corresponding to the first working frequency band.

[0109] For example, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, and information indicating the phase corresponding to the first working frequency band.

[0110] It should be understood that the above is only an example to illustrate the possible forms of the spatial domain information and frequency domain information corresponding to the first working frequency band included in the first channel state information under this implementation method, and does not constitute any limitation on the scope of protection of this application. The spatial domain information and frequency domain information corresponding to the first working frequency band can also be in other forms, which will not be illustrated one by one here.

[0111] For example, the first codebook may be the Type-2 codebook shown above, and the first channel state information includes a parameter i indicating the beam corresponding to the first working frequency band in the spatial domain. 1,1 and i 1,2 , indicating the parameter i of the strongest beam per transmission stream corresponding to the first working frequency band 1,3,l ; In the frequency domain, the parameter i indicates the beam width amplitude corresponding to the first operating frequency band 1,4,l , and parameter i indicating the beam subband amplitude phase corresponding to the first working frequency band 2,2,l and i 2,1,l .

[0112] As another possible implementation, the first PMI is obtained by the terminal device through quantization based on a second codebook, where the second codebook is different from the first codebook.

[0113] In this implementation, the first channel state information includes spatial domain information, frequency domain information, and delay variation domain information corresponding to the first working frequency band.

[0114] For example, the first channel state information includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the delay change domain basis vectors corresponding to the first working frequency band, information indicating the delay change domain basis vector amplitude corresponding to the first working frequency band, and information indicating the delay change domain basis vector phase corresponding to the first working frequency band.

[0115] It should be understood that the above is only an example to illustrate the possible forms of the information in the spatial domain and the information in the delay variation domain corresponding to the first working frequency band included in the first channel state information under this implementation method, and does not constitute any limitation on the scope of protection of this application. The information in the spatial domain and the information in the delay variation domain corresponding to the first working frequency band can also be in other forms, which will not be illustrated one by one here.

[0116] For example, the first codebook may be the Enhanced Type-2 codebook shown above, and the first channel state information includes a parameter i indicating the beam corresponding to the first working frequency band in the spatial domain. 1,1 and i 1,2 , indicating the parameter i of the strongest beam per transmission stream corresponding to the first working frequency band 1,8,l ; In the frequency domain, the parameter i indicates the beam width amplitude corresponding to the first operating frequency band 2,3,l ; In the delay variation domain, the parameter i indicating the channel multipath position corresponding to the first operating frequency band 1,5,l 、i 1,6,l and i 1,7,l , and the parameter i indicating the channel multipath amplitude and phase corresponding to the first operating frequency band 2,4,l and i 2,5,l .

[0117] Optionally, the terminal device may also quantize to obtain the first PMI based on other codebooks except the first codebook and the second codebook mentioned above, which will not be described one by one here.

[0118] As shown above, this embodiment is applied to how the terminal device reports channel state information for the newly activated working bandwidth in the scenario of activating a new working frequency band. The method flow shown in FIG2 further includes:

[0119] S230, the network device sends first indication information to the terminal device, or in other words, the terminal device receives the first indication information from the network device.

[0120] The first indication information is used to instruct activation of at least one operating frequency band other than the first operating frequency band. In this embodiment, before the network device instructs activation of the at least one operating frequency band through the first indication information, the terminal device and the network device operate in the first operating frequency band. For example, the network device transmits a first reference signal to the terminal device in the first operating frequency band.

[0121] Exemplarily, the triggering conditions for the network device to send the first indication information to the terminal device include but are not limited to the following possible implementations:

[0122] As a possible implementation manner, due to the increase in services transmitted by the network device, it is necessary to activate the at least one working frequency band mentioned above.

[0123] As another possible implementation, due to an increase in the load of the network device, it is necessary to activate the at least one working frequency band mentioned above.

[0124] It should be understood that this embodiment does not impose any limitation on the reason for triggering the activation of the at least one working frequency band mentioned above. The activation of the at least one working frequency band mentioned above may be due to an increase in business and / or load, or may be triggered by other reasons.

[0125] It should be noted that this embodiment considers that after activating the above-mentioned at least one working frequency band, it is necessary to trigger the network device to send a second reference signal and trigger the terminal device to report channel state information, so that the network device can obtain the channel state corresponding to the at least one newly activated working frequency band based on the feedback of the terminal device, so as to facilitate signal transmission on the at least one working frequency band. The method flow shown in Figure 2 also includes:

[0126] S240: The network device sends a second reference signal to the terminal device, or in other words, the terminal device receives the second reference signal from the network device.

[0127] Specifically, in this embodiment, the network device transmits a second reference signal to the terminal device on a second operating frequency band, where the second reference signal is used to measure channel state information between the terminal device and the network device corresponding to the second operating frequency band. The second operating frequency band includes at least one operating frequency band and the first operating frequency band.

[0128] Exemplarily, the second reference signal is the CSI-RS shown above, or the second reference signal is other signals capable of implementing channel measurement. This embodiment does not impose any limitation on the specific form of the second reference signal.

[0129] Furthermore, after receiving the second reference signal, the terminal device may measure information about the channel between the terminal device and the network device corresponding to the second operating frequency band based on the second reference signal to determine channel state information #1. However, in this embodiment, in order to reduce the overhead of the terminal device reporting the channel state information, the terminal device, when determining the second channel state information to be reported, takes into account the content of the already reported first channel state information and multiplexes part of the reported first channel state information to reduce the overhead of reporting the channel state information. The method flow shown in FIG2 further includes:

[0130] S250: The terminal device receives second channel state information based on a second reference signal.

[0131] Specifically, the first channel state information and the second channel state information are associated.

[0132] Exemplarily, in this embodiment, the second channel state information is channel state information associated with the first channel state information for the activated first working frequency band reported by the terminal device.

[0133] Optionally, the first channel state information and the second channel state information are associated, including: a parameter type included in the second channel state information is a subset, or a true subset, of a parameter type included in the first channel state information.

[0134] For example, the above-mentioned first channel state information includes two types of information, namely, spatial domain information and frequency domain information in the spatial domain information and frequency domain information corresponding to the first working frequency band, and the second channel state information includes one type of information, namely, frequency domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band, that is, the second channel state information may not include the spatial domain information corresponding to the second working frequency band.

[0135] For example, the above-mentioned first channel state information includes three types of information, namely, spatial domain information, frequency domain information, and delay change domain information corresponding to the first working frequency band; the second channel state information includes one type of information, namely, delay change domain information, among the spatial domain information, frequency domain information, and delay change domain information corresponding to the second working frequency band; that is, the second channel state information may not include the spatial domain information corresponding to the second working frequency band.

[0136] Optionally, the first channel state information and the second channel state information are associated, including: the terminal device considers parameters included in the first channel state information when determining the second channel state information.

[0137] Specifically, the second channel state information is the channel state information reported by the terminal device, and the second channel state information includes a second PMI obtained based on the second reference signal measurement, and the second PMI may not carry certain information corresponding to the second working frequency band (such as spatial domain information), which can reduce the PMI feedback overhead of the terminal device for the newly activated working frequency band.

[0138] For example, before the terminal device reports the second channel state information, the terminal device and the network device negotiate that for the newly activated working frequency band, there is no need to report the complete information of the PMI corresponding to the working frequency band. Instead, in order to reduce the PMI feedback overhead, only partial information of the PMI needs to be reported.

[0139] For example, the network device sends indication information #1 to the terminal device, where the indication information #1 indicates that the terminal device does not need to report the complete information of the PMI corresponding to the newly activated working frequency band. The indication information #1 may be the first indication information mentioned above, that is, the first indication information implicitly indicates that the complete information of the PMI corresponding to the at least one working frequency band does not need to be reported for the at least one working frequency band when indicating the activation of the at least one working frequency band.

[0140] As a possible implementation manner, the second PMI is obtained by the terminal device based on quantization of the first codebook.

[0141] In this implementation, the second channel state information includes information indicating a frequency domain corresponding to the second working frequency band.

[0142] For example, the second channel state information includes information indicating a sub-band amplitude corresponding to the second working frequency band and information indicating a sub-band phase corresponding to the second working frequency band.

[0143] For another example, the second channel state information includes information indicating a sub-band phase corresponding to the second working frequency band.

[0144] It should be understood that the above is only an example to illustrate the possible form of the information indicating the frequency domain corresponding to the second working frequency band included in the second channel state information under this implementation method, and does not constitute any limitation on the scope of protection of this application. The information of the frequency domain corresponding to the second working frequency band can also be in other forms, which will not be illustrated one by one here.

[0145] For example, the first codebook may be the Type-2 codebook shown above, and the second channel state information includes a parameter i indicating the beam width amplitude corresponding to the second working frequency band in the frequency domain. 1,4,l , and the parameter i indicating the beam subband amplitude phase corresponding to the second working frequency band 2,2,l and i 2,1,l .

[0146] It should be noted that, in this implementation, the parameters indicating the beam and indicating the strongest beam of each transmission layer (such as the above i 1,1 ,i 1,2 and i 1,3,l ) and the parameter indicating the beam width amplitude (i 1,4,l ) corresponds to the spatial domain. The specific physical meaning can be considered as the specific index of the beam group and the beam, and the frequency domain changes caused by the newly activated working frequency band will not cause significant changes in the spatial domain. Therefore, these parameters can reuse the spatial domain parameters in the first channel state information mentioned above after activating the new working frequency band, without the need to re-report.

[0147] The parameter indicating the beam width amplitude (i1,4,l ) corresponds to the frequency domain. The specific physical meaning is the relative value of the amplitude of different beams in the frequency domain and the strongest beam. Therefore, after the newly activated working frequency band, the spatial domain parameters in the above-mentioned first channel state information can be reused without re-reporting.

[0148] For the parameters indicating the beam subband amplitude and phase (i 2,2,l and i 2,1,l )The physical quantity corresponding to it belongs to the frequency domain, and will have different values ​​in different frequency domain sub-bands and will be reported again.

[0149] As another possible implementation manner, the second PMI is obtained by the terminal device through quantization based on a second codebook.

[0150] In this implementation, the second channel state information includes information indicating a delay variation domain corresponding to the second working frequency band.

[0151] For example, the second channel state information includes information indicating the delay variation domain basis vector corresponding to the second working frequency band, information indicating the amplitude of the delay variation domain basis vector corresponding to the second working frequency band, and information indicating the phase of the delay variation domain basis vector corresponding to the second working frequency band.

[0152] For example, in order to further reduce the overhead of reporting channel state information, the second channel state information includes a differential value between the delay variation domain basis vector corresponding to the second working frequency band and the first information, a differential value between the delay variation domain basis vector amplitude corresponding to the second working frequency band and the second information, and a differential value between the delay variation domain basis vector phase corresponding to the second working frequency band and the third information. The first information is the information indicating the delay variation domain basis vector corresponding to the first working frequency band in the first channel state information, the second information is the information indicating the delay variation domain basis vector amplitude corresponding to the first working frequency band in the first channel state information, and the third information is the information indicating the delay variation domain basis vector phase corresponding to the first working frequency band in the first channel state information.

[0153] It should be understood that the above is only an example to illustrate the possible form of the information indicating the delay variation domain corresponding to the second working frequency band included in the second channel state information under this implementation method, and does not constitute any limitation on the scope of protection of this application. The information of the delay variation domain corresponding to the second working frequency band can also be in other forms, which will not be illustrated one by one here.

[0154] For example, the first codebook may be the Enhanced Type-2 codebook shown above, and the second channel state information includes a parameter i indicating the channel multipath position corresponding to the first working frequency band in the delay variation domain. 1,5,l 、i 1,6,l and i1,7,l , and the parameter i indicating the channel multipath amplitude and phase corresponding to the first operating frequency band 2,4,l and i 2,5,l .

[0155] It should be noted that, in this implementation, the parameters indicating the beam and indicating the strongest beam of each transmission layer (such as the above i 1,1 ,i 1,2 and i 1,3,l ) and the parameter indicating the beam width amplitude (i 1,8,l ) belongs to the spatial domain. The specific physical meaning can be considered as the specific index of the beam group and beam. The frequency domain changes caused by activating the new working bandwidth will not cause significant changes in the spatial domain. Therefore, these parameters can be reused after activating the new working bandwidth without the need to re-report.

[0156] The parameter indicating the beam width amplitude (i 2,3,l ) belongs to the frequency domain. Its specific physical meaning is the relative value of the amplitude of different beams in the frequency domain compared with the strongest beam. Therefore, it can be considered that there is no change in the newly activated working bandwidth and no need to re-report.

[0157] For the parameter indicating the delay variation domain multipath (i 1,5,l 、i 1,6,l and i 1,7,l ) then report the differential change of the corresponding parameters on the activated working bandwidth, for the parameters indicating the amplitude and phase of the delay variation domain multipath (i 2,4,l and i 2,5,l ) and also reports its differential change. This is because activating a new operating bandwidth increases the frequency domain bandwidth, and the corresponding increase in the delay variation domain resolution. For example, assuming the original delay variation domain resolution is 1 and the position of a channel multipath is quantized to 1, when the delay variation domain resolution is increased to 0.5, the position of the same channel multipath will be quantized to 1.5. In this case, the terminal does not need to report the specific location of the channel multipath, but instead reports the differential change after the delay variation domain resolution is increased.

[0158] S260: The terminal device sends the second channel state information to the network device, or in other words, the network device receives the second channel state information from the terminal device.

[0159] The second channel state information includes the second PMI. After acquiring the second PMI, the network device can determine the complete PMI corresponding to the second working frequency band according to the second PMI and partial information in the received first PMI, so as to perform subsequent signal processing.

[0160] Exemplarily, the network device may determine the complete PMI corresponding to the second working frequency band according to the first PMI carried by the first channel state information and the second PMI carried by the second channel state information.

[0161] In the first approach, the second PMI is obtained by the terminal device based on quantization of the first codebook, and the first PMI is also obtained by the terminal device based on quantization of the first codebook.

[0162] For example, the first codebook is the Type-2 codebook shown above, and the first PMI includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the subband amplitude corresponding to the first working frequency band, and information indicating the subband phase corresponding to the first working frequency band. The second PMI includes information indicating the subband amplitude corresponding to the second working frequency band and information indicating the subband phase corresponding to the second working frequency band.

[0163] As a possible implementation method, the information indicating the spatial basis vectors corresponding to the second working frequency band is directly multiplexed with the information indicating the spatial basis vectors corresponding to the first working frequency band; the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band is directly multiplexed with the information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band; the information indicating the broadband amplitude corresponding to the second working frequency band is directly multiplexed with the information indicating the broadband amplitude corresponding to the first working frequency band.

[0164] In this implementation, the network device can determine the complete PMI corresponding to the second working frequency band based on partial information in the first PMI (such as information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, and information indicating the wideband amplitude corresponding to the first working frequency band), and information indicating the subband amplitude corresponding to the second working frequency band and information indicating the subband phase corresponding to the second working frequency band included in the second PMI included in the second channel state information.

[0165] As another possible implementation method, the information indicating the spatial basis vectors corresponding to the second working frequency band is indirectly determined by the information indicating the spatial basis vectors corresponding to the first working frequency band; the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band is indirectly determined by the information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band; and the information indicating the wideband amplitude corresponding to the second working frequency band is indirectly determined by the information indicating the wideband amplitude corresponding to the first working frequency band.

[0166] For example, the information indicating the spatial basis vectors corresponding to the second working frequency band is determined by the information indicating the spatial basis vectors corresponding to the first working frequency band and predefined information #1, the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band is determined by the information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band and predefined information #2, and the information indicating the broadband amplitude corresponding to the second working frequency band is determined by the information indicating the broadband amplitude corresponding to the first working frequency band and predefined information #3. Among them, the predefined information #1, the defined information #2, and the predefined information #3 can be determined by negotiation between the terminal device and the network device, can be configured by the management device, or can be predefined by the protocol, which is not limited in this embodiment.

[0167] It should be understood that in this embodiment, the spatial domain information corresponding to the second working frequency band, such as the information indicating the spatial basis vectors corresponding to the second working frequency band, the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band, and the information indicating the wideband amplitude corresponding to the second working frequency band, can be determined through known information without the need to report through the second channel state information, thereby reducing the air interface overhead of the terminal device in reporting the second channel state information.

[0168] In the second mode, the first PMI is obtained by quantizing the terminal device based on the second codebook, and the second PMI is also obtained by quantizing the terminal device based on the second codebook.

[0169] Exemplarily, the second codebook is the Enhanced Type-2 codebook shown above, and the first PMI includes information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, information indicating the delay change domain basis vectors corresponding to the first working frequency band, information indicating the delay change domain basis vector amplitude corresponding to the first working frequency band, and information indicating the delay change domain basis vector phase corresponding to the first working frequency band. The second PMI includes information indicating the delay change domain basis vectors corresponding to the second working frequency band, information indicating the delay change domain basis vector amplitude corresponding to the second working frequency band, and information indicating the delay change domain basis vector phase corresponding to the second working frequency band.

[0170] As a possible implementation method, the information indicating the spatial basis vectors corresponding to the second working frequency band is directly multiplexed with the information indicating the spatial basis vectors corresponding to the first working frequency band; the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band is directly multiplexed with the information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band; the information indicating the broadband amplitude corresponding to the second working frequency band is directly multiplexed with the information indicating the broadband amplitude corresponding to the first working frequency band.

[0171] In this implementation, the network device can determine the complete PMI corresponding to the second working frequency band based on partial information in the first PMI (such as information indicating the spatial basis vectors corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, and information indicating the wideband amplitude corresponding to the first working frequency band), and information indicating the subband amplitude corresponding to the second working frequency band and information indicating the subband phase corresponding to the second working frequency band included in the second PMI included in the second channel state information.

[0172] As another possible implementation method, the information indicating the spatial basis vectors corresponding to the second working frequency band is indirectly determined by the information indicating the spatial basis vectors corresponding to the first working frequency band; the information indicating the strongest coefficient on each transmission layer corresponding to the second working frequency band is indirectly determined by the information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band; and the information indicating the wideband amplitude corresponding to the second working frequency band is indirectly determined by the information indicating the wideband amplitude corresponding to the first working frequency band.

[0173] Exemplarily, the second codebook is the Enhanced Type-2 codebook shown above, and the first PMI includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the wideband amplitude corresponding to the first working frequency band, first information indicating the delay change domain basis vector corresponding to the first working frequency band, second information indicating the delay change domain basis vector amplitude corresponding to the first working frequency band, and third information indicating the delay change domain basis vector phase corresponding to the first working frequency band; the second PMI includes the difference between the delay change domain basis vector corresponding to the second working frequency band and the first information, the difference between the delay change domain basis vector amplitude corresponding to the second working frequency band and the second information, and the difference between the delay change domain basis vector phase corresponding to the second working frequency band and the third information.

[0174] The network device can determine the information indicating the delay variation domain basis vector corresponding to the second working frequency band, the information indicating the delay variation domain basis vector amplitude corresponding to the second working frequency band, and the information indicating the delay variation domain basis vector phase corresponding to the second working frequency band based on partial information in the first PMI (such as first information indicating the delay variation domain basis vector corresponding to the first working frequency band, second information indicating the delay variation domain basis vector amplitude corresponding to the first working frequency band, and third information indicating the delay variation domain basis vector phase corresponding to the first working frequency band), and the differential information included in the second PMI included in the second channel state information. Further, the network device can determine the complete PMI corresponding to the second working frequency band based on partial information in the first PMI (such as information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, and information indicating the broadband amplitude corresponding to the first working frequency band).

[0175] In the communication method shown in FIG2 , after activating the new working frequency band, the complete PMI corresponding to the new working bandwidth may not be included in the CSI-RS and CSI reporting, thereby saving air interface resource overhead.

[0176] It should be understood that the size of the serial numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0177] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0178] It should also be understood that in some of the above embodiments, the devices in the existing network architecture are mainly used as examples for illustrative description (such as network devices, terminal devices, etc.), and it should be understood that the embodiments of the present application are not limited to the specific form of the devices. For example, devices that can achieve the same functions in the future are applicable to the embodiments of the present application.

[0179] It is understandable that in the above-mentioned various method embodiments, the methods and operations implemented by devices (such as network devices, terminal devices) can also be implemented by components of the devices (such as chips or circuits).

[0180] The communication method provided in the embodiment of the present application is described in detail above in conjunction with FIG2 . The communication method is mainly described from the perspective of the interaction between the terminal device and the network device. It is understood that in order to implement the above functions, the terminal device and the network device include hardware structures and / or software modules corresponding to the execution of each function.

[0181] Those skilled in the art should be aware that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0182] The communication device provided in this application is described in detail below in conjunction with Figures 3 to 5. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for matters not described in detail, please refer to the method embodiment above. For the sake of brevity, some contents will not be repeated.

[0183] In the embodiment of the present application, the functional modules of the transmitting device or the receiving device can be divided according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation. The following is an example of dividing each functional module according to each function.

[0184] Figure 3 is a schematic block diagram of a communication device 10 provided in an embodiment of the present application. The device 10 includes a transceiver module 11 and a processing module 12. The transceiver module 11 can implement corresponding communication functions, and the processing module 12 is used to process data. In other words, the transceiver module 11 is used to perform operations related to receiving and sending, while the processing module 12 is used to perform operations other than receiving and sending. The transceiver module 11 can also be referred to as a communication interface or a communication unit.

[0185] Optionally, the device 10 may further include a storage module 13, which may be used to store instructions and / or data. The processing module 12 may read the instructions and / or data in the storage module so that the device implements the actions of the devices in the aforementioned method embodiments.

[0186] In one design, the apparatus 10 may correspond to the terminal device in the above method embodiment, or a component (such as a chip) of the terminal device.

[0187] The device 10 can implement the steps or processes executed by the terminal device in the above method embodiment, wherein the transceiver module 11 can be used to execute the transceiver-related operations of the terminal device in the above method embodiment, and the processing module 12 can be used to execute the processing-related operations of the terminal device in the above method embodiment.

[0188] In one possible implementation, the transceiver module 11 is used to receive a first reference signal on a first working frequency band; the processing module 12 is used to report first channel state information based on the first reference signal; the transceiver module 11 is used to receive first indication information, and the first indication information is used to indicate the activation of at least one working frequency band other than the first working frequency band; the transceiver module 11 is used to receive a second reference signal on a second working frequency band, and the second working frequency band includes the at least one working frequency band and the first working frequency band; the processing module 12 is used to report second channel state information based on the second reference signal, wherein the first channel state information and the second channel state information are associated.

[0189] When the device 10 is used to execute the method in Figure 2, the transceiver module 11 can be used to execute the steps of sending and receiving information in the method, such as steps S210, S230, S240, S250 and S270; the processing module 12 can be used to execute the processing steps in the method, such as steps S220 and S260.

[0190] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0191] In another design, the apparatus 10 may correspond to the network device in the above method embodiment, or a component (such as a chip) of the network device.

[0192] The device 10 can implement the steps or processes executed by the network device in the above method embodiment, wherein the transceiver module 11 can be used to perform the transceiver-related operations of the network device in the above method embodiment, and the processing module 12 can be used to perform the processing-related operations of the network device in the above method embodiment.

[0193] In one possible implementation, the transceiver module 11 is used to send a first reference signal on a first working frequency band, where the first reference signal is used to determine first channel state information corresponding to the first working frequency band; the transceiver module 11 is used to receive the first channel state information; the transceiver module 11 is used to send first indication information, where the first indication information is used to indicate activation of at least one working frequency band other than the first working frequency band; the transceiver module 11 is used to send a second reference signal on a second working frequency band, where the second reference signal is used to determine channel state information corresponding to the second working frequency band, where the second working frequency band includes the at least one working frequency band and the first working frequency band; the transceiver module 11 is used to receive second channel state information, where the first channel state information and the second channel state information are associated.

[0194] When the device 10 is used to execute the method in Figure 2, the transceiver module 11 can be used to execute the steps of sending and receiving information in the method, such as steps S210, S230, S240, S250 and S270; the processing module 12 can be used to execute the processing steps in the method.

[0195] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0196] It should also be understood that the device 10 here is embodied in the form of a functional module. The term "module" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and memory for executing one or more software or firmware programs, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 10 may be specifically the mobile management network element in the above-mentioned embodiment, and may be used to execute the various processes and / or steps corresponding to the mobile management network element in the above-mentioned method embodiments; or, the device 10 may be specifically the terminal device in the above-mentioned embodiment, and may be used to execute the various processes and / or steps corresponding to the terminal device in the above-mentioned method embodiments. To avoid repetition, it will not be described here.

[0197] The apparatus 10 of each of the above-described solutions has the function of implementing the corresponding steps performed by the devices (such as terminal devices and network devices) in the above-described methods. This function can be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above-described functions; for example, the transceiver module can be replaced by a transceiver (for example, the transmitting unit in the transceiver module can be replaced by a transmitter, and the receiving unit in the transceiver module can be replaced by a receiver), and other units, such as the processing module, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0198] In addition, the transceiver module 11 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing module may be a processing circuit.

[0199] FIG4 is a schematic diagram of another communication device 20 provided in an embodiment of the present application. Device 20 includes a processor 21, which is configured to execute computer programs or instructions stored in memory 22, or read data / signaling stored in memory 22, to perform the methods described in the above method embodiments. Optionally, there may be one or more processors 21.

[0200] Optionally, as shown in FIG4 , the apparatus 20 further includes a memory 22 for storing computer programs or instructions and / or data. The memory 22 may be integrated with the processor 21 or may be separately provided. Optionally, there may be one or more memories 22 .

[0201] Optionally, as shown in Figure 4, the device 20 further includes a transceiver 23, which is used to receive and / or send signals. For example, the processor 21 is used to control the transceiver 23 to receive and / or send signals.

[0202] As a solution, the apparatus 20 is used to implement the operations performed by the terminal device in each of the above method embodiments.

[0203] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0204] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0205] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0206] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0207] 5 is a schematic diagram of a chip system 30 provided in an embodiment of the present application. The chip system 30 (or also referred to as a processing system) includes a logic circuit 31 and an input / output interface 32.

[0208] The logic circuit 31 may be a processing circuit in the chip system 30. The logic circuit 31 may be coupled to a storage unit and call instructions in the storage unit so that the chip system 30 can implement the methods and functions of the various embodiments of the present application. The input / output interface 32 may be an input / output circuit in the chip system 30, outputting information processed by the chip system 30 or inputting data or signaling information to be processed into the chip system 30 for processing.

[0209] As a solution, the chip system 30 is used to implement the operations performed by the terminal device in the above various method embodiments.

[0210] For example, the logic circuit 31 is used to implement the processing-related operations performed by the terminal device in the above method embodiment; the input / output interface 32 is used to implement the sending and / or receiving-related operations performed by the terminal device in the above method embodiment.

[0211] An embodiment of the present application further provides a computer-readable storage medium on which computer instructions for implementing the methods executed by the device in the above-mentioned method embodiments are stored.

[0212] For example, when the computer program is executed by a computer, the computer can implement the methods executed by the terminal device or the network device in each embodiment of the above method.

[0213] An embodiment of the present application also provides a computer program product, comprising instructions, which, when executed by a computer, implement the methods performed by a terminal device or a network device in the above-mentioned method embodiments.

[0214] An embodiment of the present application also provides a communication system, including the aforementioned terminal device and network device.

[0215] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0216] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0217] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instructions can 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 can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)). For example, the aforementioned available medium includes, but is not limited to, various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0218] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: Receiving a first reference signal at a first operating frequency band; Reporting first channel state information based on the first reference signal; receiving first indication information, where the first indication information is used to indicate activation of at least one working frequency band other than the first working frequency band; Receiving a second reference signal on a second working frequency band, wherein the second working frequency band includes the at least one working frequency band and the first working frequency band; Based on the second reference signal, second channel state information is reported, wherein the first channel state information is associated with the second channel state information.

2. The method according to claim 1, characterized in that The first channel state information and the second channel state information are associated with each other, including: The parameter type included in the second channel state information is a subset of the parameter type included in the first channel state information, or a true subset.

3. The method according to claim 1 or 2, characterized in that: The first channel state information includes two types of information, namely, spatial domain information and frequency domain information in the spatial domain information and frequency domain information corresponding to the first working frequency band, and the second channel state information includes one type of information, namely, frequency domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band.

4. The method according to claim 3, characterized in that The first channel state information includes information indicating a spatial basis vector corresponding to the first working frequency band, information indicating a strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating a wideband amplitude corresponding to the first working frequency band, information indicating a subband amplitude corresponding to the first working frequency band, and information indicating a subband phase corresponding to the first working frequency band. The second channel state information includes information indicating a sub-band amplitude corresponding to the second working frequency band and information indicating a sub-band phase corresponding to the second working frequency band.

5. The method according to claim 3, characterized in that: The first channel state information includes information indicating a spatial basis vector corresponding to the first working frequency band, information indicating a strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating a wideband amplitude corresponding to the first working frequency band, and information indicating a subband phase corresponding to the first working frequency band. The second channel state information includes information indicating a sub-band phase corresponding to the second working frequency band.

6. The method according to claim 1 or 2, characterized in that: The first channel state information includes three types of information, namely, spatial domain information, frequency domain information, and delay variation domain information corresponding to the first working frequency band; the second channel state information includes one type of information, namely, delay variation domain information, among the spatial domain information, frequency domain information, and delay variation domain information corresponding to the second working frequency band.

7. The method according to claim 6, characterized in that The first channel state information includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the broadband amplitude corresponding to the first working frequency band, information indicating the delay variation domain basis vector corresponding to the first working frequency band, information indicating the delay variation domain basis vector amplitude corresponding to the first working frequency band, and information indicating the delay variation domain basis vector phase corresponding to the first working frequency band. The second channel state information includes information indicating the delay variation domain basis vector corresponding to the second working frequency band, information indicating the amplitude of the delay variation domain basis vector corresponding to the second working frequency band, and information indicating the phase of the delay variation domain basis vector corresponding to the second working frequency band.

8. The method according to claim 6, characterized in that The first channel state information includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the broadband amplitude corresponding to the first working frequency band, first information indicating the delay variation domain basis vector corresponding to the first working frequency band, second information indicating the amplitude of the delay variation domain basis vector corresponding to the first working frequency band, and third information indicating the phase of the delay variation domain basis vector corresponding to the first working frequency band; The second channel state information includes a differential value between a delay variation domain basis vector corresponding to the second working frequency band and the first information, a differential value between an amplitude of a delay variation domain basis vector corresponding to the second working frequency band and the second information, and a differential value between a phase of a delay variation domain basis vector corresponding to the second working frequency band and the third information.

9. A communication method, characterized in that: include: A first reference signal is sent on a first working frequency band, wherein the first reference signal is used to determine a first signal corresponding to the first working frequency band. Channel status information; receiving the first channel state information; Sending first indication information, where the first indication information is used to indicate activation of at least one working frequency band other than the first working frequency band; Sending a second reference signal on a second working frequency band, where the second reference signal is used to determine channel state information corresponding to the second working frequency band, where the second working frequency band includes the at least one working frequency band and the first working frequency band; Second channel state information is received, wherein the first channel state information and the second channel state information are associated.

10. The method according to claim 9, characterized in that The first channel state information and the second channel state information are associated with each other, including: The parameter type included in the second channel state information is a subset of the parameter type included in the first channel state information, or a true subset.

11. The method according to claim 9 or 10, characterized in that: The first channel state information includes two types of information, namely, spatial domain information and frequency domain information in the spatial domain information and frequency domain information corresponding to the first working frequency band, and the second channel state information includes one type of information, namely, frequency domain information in the spatial domain information and frequency domain information corresponding to the second working frequency band.

12. The method according to claim 11, characterized in that The first channel state information includes information indicating a spatial basis vector corresponding to the first working frequency band, information indicating a strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating a wideband amplitude corresponding to the first working frequency band, information indicating a subband amplitude corresponding to the first working frequency band, and information indicating a subband phase corresponding to the first working frequency band. The second channel state information includes information indicating a sub-band amplitude corresponding to the second working frequency band and information indicating a sub-band phase corresponding to the second working frequency band.

13. The method according to claim 11, characterized in that The first channel state information includes information indicating a spatial basis vector corresponding to the first working frequency band, information indicating a strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating a wideband amplitude corresponding to the first working frequency band, and information indicating a subband phase corresponding to the first working frequency band. The second channel state information includes information indicating a sub-band phase corresponding to the second working frequency band.

14. The method according to claim 9 or 10, characterized in that The first channel state information includes three types of information, namely, spatial domain information, frequency domain information, and delay variation domain information corresponding to the first working frequency band; the second channel state information includes one type of information, namely, delay variation domain information, among the spatial domain information, frequency domain information, and delay variation domain information corresponding to the second working frequency band.

15. The method according to claim 14, characterized in that The first channel state information includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the broadband amplitude corresponding to the first working frequency band, information indicating the delay variation domain basis vector corresponding to the first working frequency band, information indicating the delay variation domain basis vector amplitude corresponding to the first working frequency band, and information indicating the delay variation domain basis vector phase corresponding to the first working frequency band. The second channel state information includes information indicating the delay variation domain basis vector corresponding to the second working frequency band, information indicating the amplitude of the delay variation domain basis vector corresponding to the second working frequency band, and information indicating the phase of the delay variation domain basis vector corresponding to the second working frequency band.

16. The method according to claim 14, characterized in that The first channel state information includes information indicating the spatial basis vector corresponding to the first working frequency band, information indicating the strongest coefficient on each transmission layer corresponding to the first working frequency band, information indicating the broadband amplitude corresponding to the first working frequency band, first information indicating the delay variation domain basis vector corresponding to the first working frequency band, second information indicating the amplitude of the delay variation domain basis vector corresponding to the first working frequency band, and third information indicating the phase of the delay variation domain basis vector corresponding to the first working frequency band; The second channel state information includes a differential value between a delay variation domain basis vector corresponding to the second working frequency band and the first information, a differential value between an amplitude of a delay variation domain basis vector corresponding to the second working frequency band and the second information, and a differential value between a phase of a delay variation domain basis vector corresponding to the second working frequency band and the third information.

17. A communication device, characterized in that: The communication device includes a processor and a memory, wherein the processor and the memory are coupled, and the memory is used to store a computer program. When the processor runs the computer program, the communication device executes the method described in any one of claims 1 to 8; or, the communication device executes the method described in any one of claims 9 to 16.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 16.

19. A computer program product, characterized in that The method comprises instructions, which, when the computer instructions are executed on a communication device, cause the communication device to execute the method according to any one of claims 1 to 16.

20. A chip, characterized in that: The chip includes a processor and a communication interface. The processor reads and runs instructions through the communication interface. When the chip is installed in a communication device, the communication device executes the method as described in any one of claims 1-16.

21. A communication system, characterized in that: The communication system comprises a terminal device and a network device, wherein the terminal device is used to execute the method according to any one of claims 1 to 8, and the network device is used to execute the method according to any one of claims 9 to 16.

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