Channel state information determination method and device

Abstract

The invention discloses a channel state information determination method and device, and relates to the field of wireless communication. In the method, network equipment sends at least two reference signals including a first reference signal and a second reference signal and receives first information, and the first information is used for indicating that part or all of information in CSI (Channel State Information) corresponding to the second reference signal is determined based on the first reference signal. The transmission period of the first reference signal is smaller than that of the second reference signal. By adopting the design, the network equipment can efficiently acquire the CSI.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a method and device for determining channel state information. Background Art

[0002] Currently, the application of Massive Multiple Input Multiple Output (Massive MIMO) technology plays a vital role in improving the spectrum efficiency of the system. When using MIMO technology, before sending data to the terminal, the base station needs to rely on the channel state information (CSI) reported by the terminal to the base station to precode the data.

[0003] The basic process of CSI reporting between the base station and the terminal is as follows: the base station needs to first send a signaling for notifying the channel measurement configuration and notifying the terminal of the time and behavior of the channel measurement; then the base station sends a pilot to the terminal, which is used for channel measurement. The terminal measures according to the pilot sent by the base station, calculates the final CSI, and reports the CSI to the base station. The base station then precodes the data according to the CSI reported by the UE and sends it.

[0004] Among them, the base station can be configured with multiple pilots. How to improve the efficiency of the terminal updating CSI according to the pilot is an issue worthy of attention. Summary of the invention

[0005] The present application provides a method and apparatus for determining channel state information, so as to enable a terminal to efficiently update and report CSI.

[0006] In a first aspect, the present application provides a method for determining channel state information, which can be performed by a network device or a module (such as a chip) in the network device. The method includes: sending at least two reference signals; receiving first information, wherein the first information is used to indicate that part or all of the information in the channel state information CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; the sending period of the first reference signal is less than the sending period of the second reference signal.

[0007] By adopting the above method, the network device can receive the first information after sending at least two reference signals. When the first information indicates that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the network device can be enabled to schedule the terminal to report part or all of the information in the CSI corresponding to the second reference signal according to the sending period of the first reference signal after receiving the first information, without having to wait until the second reference signal is sent each time to schedule the terminal to report the updated CSI corresponding to the second reference signal. Therefore, the above method can enable the network device to obtain CSI more efficiently. Furthermore, since the sending period of the first reference signal is less than the sending period of the second reference signal, the network device can obtain part or all of the information in the CSI corresponding to the second reference signal in a timely manner, which can also reduce the aging of the CSI corresponding to the second reference signal and improve system performance.

[0008] In one possible design, after receiving the first information, part or all of the information in the CSI corresponding to the second reference signal is received according to a third period; wherein the third period is greater than or equal to the first period and less than the second period, and the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; and the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0009] By adopting the above design, it is possible to shorten the reporting period of part or all of the information in the CSI corresponding to the second reference signal, thereby reducing the aging of the CSI corresponding to the second reference signal.

[0010] In one possible design, the CSI reporting configuration of the second reference signal also includes the third period.

[0011] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period, or the difference between the third period and the second period.

[0012] In one possible design, after receiving the first information, part of the CSI corresponding to the second reference signal that is not indicated by the first information is received according to the second period.

[0013] In one possible design, the CSI corresponding to the second reference signal is reported non-periodically; after receiving the first information, part or all of the information in the CSI corresponding to the second reference signal is received at least twice; wherein the reception times of the at least two times are between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0014] By adopting the above design, the network device can schedule the terminal to report part or all of the information in the CSI corresponding to the second reference signal according to the sending period of the first reference signal. There is no need to wait until the second reference signal is sent before scheduling the terminal to report the updated CSI corresponding to the second reference signal. It can achieve timely acquisition of part or all of the information in the CSI corresponding to the second reference signal, thereby reducing the aging of the CSI corresponding to the second reference signal.

[0015] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of channel quality information CQI, precoding matrix indication PMI or rank indication RI.

[0016] In one possible design, before sending the at least two reference signals, configuration information of the at least two reference signals is sent, wherein the configuration information of the at least two reference signals includes a sending period of the first reference signal and a sending period of the second reference signal.

[0017] In a possible design, before receiving the first information, second information is sent, and the second information instructs the terminal to feed back the first information.

[0018] By adopting the above design, it is possible to instruct the terminal to determine whether part or all of the CSI information corresponding to another reference signal can be determined based on one reference signal.

[0019] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0020] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0021] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0022] The above design can be used to determine part or all of the CSI information corresponding to the high-frequency reference signal based on the low-frequency reference signal.

[0023] In one possible design, a correlation coefficient between a first reference signal and a second reference signal is received.

[0024] In a second aspect, the present application provides a method for determining channel state information, which can be performed by a terminal or a module (such as a chip) in the terminal. The method includes: receiving at least two reference signals; determining first information according to the at least two reference signals, the first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; sending the first information.

[0025] By adopting the above method, after receiving at least two reference signals, the terminal determines that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, and then sends the first information to the network device. Since different reference signals are usually used to measure the CSI corresponding to different antenna ports, the terminal determines that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, so that the terminal can measure only the first reference signal to update the CSI of the antenna port corresponding to the first reference signal and all or part of the CSI of the antenna port corresponding to the second reference signal, that is, the terminal does not need to update the CSI corresponding to the second reference signal every time after measuring the second reference signal. Therefore, the above method can enable the terminal to update and report the CSI more efficiently, thereby improving the efficiency of the terminal updating the CSI according to the reference signal, and can facilitate the network device to schedule CSI reporting more frequently, which can reduce the aging of the CSI corresponding to the second reference signal and improve system performance.

[0026] In one possible design, after sending the first information, part or all of the information in the CSI corresponding to the second reference signal is sent according to a third period; wherein the third period is greater than or equal to the first period and less than the second period, and the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; and the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0027] In one possible design, the CSI reporting configuration of the second reference signal further includes the third period;

[0028] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period.

[0029] In one possible design, after sending the first information, part of the CSI corresponding to the second reference signal that is not indicated by the first information is sent according to the second period.

[0030] In one possible design, the CSI corresponding to the second reference signal is reported non-periodically; after sending the first information, part or all of the information in the CSI corresponding to the second reference signal is sent at least twice; wherein the sending times of the at least two times are between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0031] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of CQI, PMI or RI.

[0032] In one possible design, before receiving at least two reference signals, configuration information of the at least two reference signals is received, wherein the configuration information of the at least two reference signals includes a sending period of the first reference signal and a sending period of the second reference signal.

[0033] In one possible design, before sending the first information, second information is received, and the second information instructs the terminal to feed back the first information.

[0034] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0035] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0036] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0037] In a third aspect, the present application provides a communication device. The device includes: a processing unit and a transceiver unit; the processing unit calls the transceiver unit to execute: sending at least two reference signals; receiving first information, the first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; the sending period of the first reference signal is less than the sending period of the second reference signal.

[0038] In one possible design, the transceiver unit is used to receive part or all of the information in the CSI corresponding to the second reference signal according to a third period after receiving the first information; wherein the third period is greater than or equal to the first period and less than the second period, the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0039] In one possible design, the CSI reporting configuration of the second reference signal also includes the third period.

[0040] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period.

[0041] In one possible design, the transceiver unit is used to receive, after receiving the first information, part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period.

[0042] In one possible design, the transceiver unit is used to receive part or all of the information in the CSI corresponding to the second reference signal at least twice after receiving the first information, when the CSI corresponding to the second reference signal is non-periodically reported; wherein the reception times of the at least two times are both between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0043] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of CQI, PMI or RI.

[0044] In one possible design, the transceiver unit is used to send configuration information of the at least two reference signals before sending the at least two reference signals, wherein the configuration information of the at least two reference signals includes the sending period of the first reference signal and the sending period of the second reference signal.

[0045] In one possible design, the transceiver unit is used to send second information before receiving the first information, and the second information instructs the terminal to feedback the first information.

[0046] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0047] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0048] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0049] In a fourth aspect, the present application provides a communication device. The device includes: the device includes: a processing unit and a transceiver unit; the transceiver unit is used to receive at least two reference signals; the processing unit is used to determine first information according to the at least two reference signals, the first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; the transceiver unit is used to send the first information.

[0050] In one possible design, the transceiver unit is used to send part or all of the information in the CSI corresponding to the second reference signal according to a third period after sending the first information; wherein the third period is greater than or equal to the first period and less than the second period, and the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; and the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0051] In one possible design, the CSI reporting configuration of the second reference signal further includes the third period;

[0052] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period.

[0053] In one possible design, the transceiver unit is used to send part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period after sending the first information.

[0054] In one possible design, the transceiver unit is used to send part or all of the information in the CSI corresponding to the second reference signal at least twice after sending the first information, when the CSI corresponding to the second reference signal is non-periodically reported; wherein the sending times of the at least two times are between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0055] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of CQI, PMI or RI.

[0056] In one possible design, the transceiver unit is used to receive configuration information of the at least two reference signals before receiving the at least two reference signals, wherein the configuration information of the at least two reference signals includes a sending period of the first reference signal and a sending period of the second reference signal.

[0057] In one possible design, the transceiver unit is used to receive second information before sending the first information, and the second information indicates that the terminal feeds back the first information.

[0058] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0059] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0060] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0061] In a fifth aspect, the present application provides a communication device, which can be applied to a terminal device or a network device, and includes a unit for executing any of the methods described in any of the above aspects.

[0062] In a sixth aspect, the present application provides a communication device comprising at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used to read and execute the programs and data stored in the storage element, so that any method described in any one of the above aspects of the present application is implemented.

[0063] In a seventh aspect, the present application further provides a computer program, which, when executed on a computer, enables the computer to execute any of the methods described in any of the above aspects.

[0064] In an eighth aspect, the present application provides a communication device, comprising: an interface circuit; the interface circuit is used to provide input and / or output of programs or instructions to at least one processor; the at least one processor is used to execute the program or instructions so that the communication device can implement any method described in any of the above aspects.

[0065] In a possible manner, the communication device includes the at least one processor.

[0066] In a ninth aspect, the present application provides a computer storage medium storing a software program, which, when read and executed by one or more processors, can implement any of the methods described in any of the above aspects.

[0067] In a tenth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute any of the methods described in any of the above aspects.

[0068] In an eleventh aspect, a chip system is provided, comprising at least one chip and a memory, wherein the at least one chip is used to read and execute a program stored in the memory to implement any of the methods described in any of the above aspects.

[0069] In the twelfth aspect, a communication system is provided, the system comprising at least one terminal and a network device, the terminal executes any method described in the first aspect, and the network device executes any method described in the second aspect.

[0070] Based on the implementations provided in the above aspects, the present application can also be further combined to provide more implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 A schematic diagram of the architecture of a mobile communication system used in an embodiment of the present application;

[0072] Figure 2 A flowchart for summarizing a method for determining channel state information in the present application;

[0073] Figure 3 This is a schematic diagram of non-periodic reporting of CSI in this application;

[0074] Figure 4 This is a schematic diagram of non-periodic reporting and periodic reporting of CSI in this application;

[0075] Figure 5 This is a schematic diagram of the structure of a communication device in this application;

[0076] Figure 6 This is a schematic diagram of the structure of another communication device in this application. DETAILED DESCRIPTION

[0077] The embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), or applied to future communication systems or other similar communication systems.

[0078] Figure 1 FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. Figure 1 As shown, the communication system includes a wireless access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The wireless access network 100 may include at least one wireless access network device (such as Figure 1 110a and 110b), and may further include at least one terminal (such as Figure 1 120a-120j in the figure). The terminal is connected to the wireless access network device by wireless means, and the wireless access network device is connected to the core network by wireless or wired means. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated on the same physical device, or part of the functions of the core network device and part of the functions of the wireless access network device can be integrated on one physical device. Terminals and wireless access network devices can be connected to each other by wired or wireless means. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 Not drawn in.

[0079] The wireless access network equipment may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation base station in the sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; it may also be a module or unit that completes part of the functions of a base station, for example, it may be a central unit (CU) or a distributed unit (DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and may also complete the functions of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and may also complete the functions of part or all of the physical layer. For the specific description of each of the above protocol layers, please refer to the relevant technical specifications of the 3rd generation partnership project (3GPP). The wireless access network device may be a macro base station (such as Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b), may also be a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For ease of description, the following description takes the network device as an example of the wireless access network device.

[0080] The terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0081] The network equipment and terminal can be fixed or movable. The network equipment and terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; can also be deployed on airplanes, balloons and artificial satellites. The embodiments of the present application do not limit the application scenarios of the network equipment and terminals.

[0082] The roles of network devices and terminals can be relative, for example, Figure 1 The helicopter or drone 120i in the figure can be configured as a mobile network device. For the terminals 120j that access the wireless access network 100 through 120i, the drone 120i is a network device; but for the network device 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between network devices. In this case, relative to 110a, 120i is also a network device. Therefore, network devices and terminals can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure can be called communication devices with network device functions. Figure 1 120a-120j in the figure can be called communication devices with terminal functions.

[0083] Network devices and terminals, network devices and network devices, and terminals and terminals can communicate through authorized spectrum, unlicensed spectrum, or both; can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0084] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem including the network device function. The control subsystem including the network device function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, smart city, etc. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

[0085] In an embodiment of the present application, the network device sends a downlink signal or downlink information to the terminal, and the downlink information is carried on a downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on an uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection with the cell controlled by the base station. The cell with which the terminal has established a wireless connection is called the service cell of the terminal. When the terminal communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0086] It can be understood that in the embodiments of the present application, the physical downlink shared channel (PDSCH), the physical downlink control channel (PDCCH), the physical uplink control channel (PUCCH) and the physical uplink shared channel (PUSCH) are only used as examples of downlink data channels, downlink control channels, uplink control channels and uplink data channels, respectively. In different systems and different scenarios, data channels and control channels may have different names, and the embodiments of the present application do not limit this.

[0087] Based on the above Figure 1 The network system architecture shown in the figure and the contents of the above-mentioned related technical introduction, the execution subject of the method for determining new channel state information provided in the embodiment of the present application is introduced by taking the network device and the terminal as an example. For example, the network device can be the aforementioned Figure 1 The access network device 110a or the access network device 110b in the embodiment. The terminal may be the aforementioned Figure 1 Any terminal 120 shown. In addition, it should be understood that the network device can also be replaced by a communication device with a network device function or a chip, unit or module inside a communication device with a network device function. The terminal can also be replaced by a communication device with a terminal function or a chip, unit or module inside a communication device with a terminal function.

[0088] In a communication system, a pilot signal may also be referred to as a reference signal (RS), which is a signal provided by a transmitter to a receiver for channel estimation or channel detection and known to both the transmitter and the receiver. Reference signals are divided into uplink reference signals and downlink reference signals. Unless otherwise specified, the reference signal in this application is a downlink reference signal, and illustratively, the downlink reference signal may be a channel state information reference signal (CSI-RS).

[0089] In the present application, the network device may send configuration information of at least two reference signals. Exemplarily, the at least two reference signals may be CSI-RS, and the network device sends the configuration information of the at least two reference signals through CSI-ResourceConfig configured by the radio resource control (RRC) layer before sending the at least two reference signals (i.e., the following step 200).

[0090] The configuration information of at least two reference signals may include the measurement configuration of each reference signal in the at least two reference signals, and the measurement configuration of each reference signal may include the resource mapping (resourceMapping), period and offset (periodicityAndOffset) of the reference signal. Resource mapping includes the frequency domain location (frequencyDomainAllocation) within the resource block (resource block, RB), the time domain start symbol location (firstOFDMSymbolInTimeDomain), the code grouping type (cdm-Type), the frequency domain density (density), the frequency domain bandwidth (freqBand), etc. The period and offset include the transmission period of the reference signal (also called the reference signal period) and the offset (also called the time slot offset), wherein the measurement configuration of each reference signal can also be called the channel measurement configuration of each reference signal.

[0091] Exemplarily, the configuration information of the at least two reference signals may include a transmission period and a time slot offset of a first reference signal, and a transmission period and a time slot offset of a second reference signal. The first reference signal and the second reference signal belong to at least two reference signals.

[0092] It can be understood that, currently, the transmission period and offset of the reference signal included in the period and offset are described in units of time slots. For example, the period of the reference signal includes N time slots, and the time slot offset is M time slots, where N and M are positive integers. With the evolution of technology, the transmission period and offset of the reference signal included in the period and offset can also be described in units of other time units, such as subframes, symbols, etc., which is not limited in the present application. In the following, the description of the transmission period and offset of the reference signal in units of time slots is only for example and does not constitute a limitation of the present application. The "time slot" in the following can be replaced by "time unit".

[0093] In addition, in a possible implementation, the configuration information of at least two reference signals may further include a CSI reporting configuration of each reference signal in the at least two reference signals. The CSI reporting configuration of each reference signal may be used to indicate whether the CSI corresponding to the reference signal is periodically reported or aperiodically reported. The CSI reporting configuration of each reference signal may also be referred to as a CSI feedback configuration of each reference signal.

[0094] It can be understood that the CSI reporting configuration of each reference signal and the measurement configuration information of the reference signal can be sent together or separately, and this application does not limit this.

[0095] In a possible implementation manner, the CSI reporting configuration of the reference signal may further include one or more CSI reporting periods, which may also be referred to as a CSI feedback period, or simply as a reporting period or feedback period.

[0096] Exemplarily, the number of CSI reporting periods included in the CSI reporting configuration for the reference signal can be specifically divided into the following two cases:

[0097] Case A: When the CSI reporting configuration of the reference signal includes a CSI reporting period, the CSI reporting period is greater than or equal to the transmission period of the reference signal.

[0098] For example, assuming that the transmission period of the reference signal A is 5 time slots, if the CSI reporting configuration of the reference signal A includes a CSI reporting period, the CSI reporting period is greater than or equal to 5 time slots.

[0099] For another example, assuming that the transmission period of the reference signal B is 20 time slots, if the CSI reporting configuration of the reference signal B includes a CSI reporting period, the CSI reporting period is greater than or equal to 20 time slots.

[0100] Case B: When the CSI reporting configuration of the reference signal includes multiple CSI reporting periods, there is a CSI reporting period greater than or equal to the transmission period of the reference signal among the multiple CSI reporting periods. Exemplarily, the number of CSI reporting periods greater than or equal to the transmission period of the reference signal is generally 1, and the CSI reporting period is the default CSI reporting period.

[0101] Optionally, there may be a CSI reporting period that is smaller than the transmission period of the reference signal among the multiple CSI reporting periods. For application scenarios of the CSI reporting period that is smaller than the transmission period of the reference signal, reference may be made to the relevant description of the following scenario 1.

[0102] In another possible implementation, the CSI reporting configuration of the reference signal may indicate that the CSI corresponding to the reference signal is reported aperiodically. At this time, the network device may schedule the terminal to report the CSI corresponding to the reference signal through downlink control information (DCI).

[0103] Figure 2 The following is a possible flow chart of a method for determining channel state information provided by an embodiment of the present application. Figure 2 As shown, the method includes:

[0104] Step 200: The network device sends at least two reference signals. Correspondingly, the terminal receives at least two reference signals.

[0105] It should be understood that the at least two reference signals include two or more than two CSI-RSs.

[0106] Step 210: The terminal determines first information based on at least two reference signals. The first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal. The first reference signal and the second reference signal belong to at least two reference signals, that is, the at least two reference signals include the first reference signal and the second reference signal.

[0107] In a possible implementation, when the number of at least two reference signals is large, the terminal may first group the at least two reference signals, and then determine whether part or all of the CSI information corresponding to a reference signal included in each group can be determined based on another reference signal based on at least one group of reference signals obtained by grouping. Each group of reference signals may include two reference signals. Exemplarily, each group of reference signals in the at least one group of reference signals obtained by grouping satisfies the following conditions:

[0108] Condition 1: The absolute value of the difference between the transmission times of the two reference signals is less than or equal to a first preset threshold.

[0109] For any reference signal, the transmission time of the reference signal can be determined according to the transmission period and the time slot offset of the reference signal.

[0110] For example,

[0111] in, is the number of time slots in a frame, n f is the frame number, is the time slot number in a frame, where It can be understood as the total time slot number, T offset is the time slot offset of the reference signal, T CSI-RS is the reference signal sending period.

[0112] Furthermore, the network device sends the reference signal at the time slot determined by the frame number and the time slot number that satisfy the above formula.

[0113] In a possible design, the two reference signals have the same transmission time, that is, the difference between the transmission times of the two reference signals is 0. The two reference signals having the same transmission time can be understood as the network device transmitting the two reference signals in the same time slot, that is, the two reference signals have the same transmission time slot. Alternatively, it can be described as the network device transmitting the two reference signals in the same time unit.

[0114] Exemplarily, the terminal can obtain the transmission period and time slot offset of the first reference signal, and the transmission period and time slot offset of the second reference signal according to the configuration information of at least two reference signals. For example, the transmission period of the first reference signal is 5 time slots, the time slot offset is 0 time slot, and the transmission period of the second reference signal is 20 time slots, and the time slot offset is 0 time slot. It can be seen that the network device sends the first reference signal and the second reference signal at the same time every 20 time slots. At this time, there is a transmission time of the first reference signal that is the same as the transmission time of the second reference signal. Therefore, the first reference signal and the second reference signal are a set of reference signals that meet condition 1.

[0115] In another possible design, the difference between the transmission times of two reference signals is less than or equal to a first preset threshold. For example, the first preset threshold may be 1 time slot or 2 time slots, which is not limited in the present application.

[0116] For example, if the transmission period of the first reference signal is 5 time slots, the time slot offset is 0 time slot, and the transmission period of the second reference signal is 20 time slots, the time slot offset is 1 time slot, then the difference between the transmission time of the first reference signal and the transmission time of the second reference signal is equal to 1 time slot. Therefore, the first reference signal and the second reference signal are a set of reference signals that meet condition 1.

[0117] Condition 2: The absolute value of the difference between the frequencies of the two reference signals is less than or equal to a second preset threshold.

[0118] The frequency of the reference signal may also be described as the frequency band where the reference signal is located, or the center frequency of the frequency band where the reference signal is located. For example, the center frequency of the frequency band where the reference signal is located is 2.6 GHz or 3.5 GHz.

[0119] Exemplarily, during the process of the terminal accessing the network device, the terminal determines the frequency band for communicating with the network device. After the terminal accesses the network device, the network device may notify the terminal to communicate on more frequency bands. Furthermore, the network device may send reference signals on multiple different frequency bands, and accordingly, the terminal may receive corresponding reference signals on multiple different frequency bands.

[0120] Exemplarily, when the absolute value of the difference between the frequency of the first reference signal and the frequency of the second reference signal is less than or equal to the second preset threshold, the first reference signal and the second reference signal are a group of reference signals that satisfy condition 2. The difference between the frequency of the first reference signal and the frequency of the second reference signal is also the difference between the center frequency of the frequency band where the first reference signal is located and the center frequency of the frequency band where the second reference signal is located. The second preset threshold may be 1 GHz, which is not limited in the present application.

[0121] In a possible implementation, the frequency of the first reference signal may be less than the frequency of the second reference signal. Alternatively, the frequency of the first reference signal may be greater than or equal to the frequency of the second reference signal.

[0122] It should be noted that at least one group of reference signals grouped may satisfy both condition 1 and condition 2, or may satisfy either condition 1 or condition 2. Condition 1 and condition 2 are merely examples, and other conditions may exist, which are not limited in this application.

[0123] Exemplarily, when the terminal determines that the first reference signal and the second reference signal satisfy the above-mentioned condition 1 and / or condition 2, the terminal may determine the relevant parameters of the first reference signal and the second reference signal, and then compare the relevant parameters with the preset threshold value, and judge whether part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal according to the comparison result. In addition, if it is determined according to the comparison result that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, then correspondingly, part or all of the information in the CSI corresponding to the first reference signal can also be determined based on the second reference signal. The following is only explained by taking the example that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal.

[0124] The following only takes the first reference signal and the second reference signal of the at least two reference signals as an example to introduce a specific calculation method of the related parameters of the first reference signal and the second reference signal.

[0125] Method 1:

[0126] The terminal measures the first reference signal according to the transmission period of the first reference signal, and measures the second reference signal according to the transmission period of the second reference signal. Further, the terminal obtains a channel measurement matrix obtained by measuring the first reference signal and the second reference signal at T same times, which can be specifically expressed as H 1,t and H 2,t , where t=1,2,…,T, T is a positive integer, H 1,t represents the channel measurement matrix measured for the first reference signal at time t, H 2,t represents the channel measurement matrix measured for the second reference signal at time t, H 1,t is a column vector of N1×1, the absolute value of the difference between the center frequency of the frequency band where the first reference signal is located and the center frequency of the frequency band where the second reference signal is located is less than or equal to the second preset threshold, H 2,t is a column vector of N2×1, where N1 and N2 are both positive integers. 1,t and H 2,t It can be obtained by performing channel estimation on the measurement result of the first reference signal, H 2,t It can be obtained by performing channel estimation on the measurement result of the second reference signal, for example Y 1,t is the received signal corresponding to the first reference signal, X 1,t is a sending pilot corresponding to the first reference signal.

[0127] Exemplarily, assuming that the transmission period of the first reference signal is 5 time slots, the time slot offset of the first reference signal is 0 time slots, the transmission period of the second reference signal is 20 time slots, and the time slot offset of the second reference signal is 0 time slots, the terminal can simultaneously receive the first reference signal and the second reference signal every 20 time slots. When simultaneously receiving the first reference signal and the second reference signal, the terminal records the channel measurement matrix measured for the first reference signal and the channel measurement matrix measured for the second reference signal.

[0128] Then, the terminal can 1,t and H 2,t Calculate R, where H t =[H 1,t ;H 2,t ], H t , t=1,2,…,T is T column vectors of length N1+N2, Yes H t The conjugate transpose of . Then, the terminal performs singular value decomposition on R to obtain the (N1+N2) eigenvalues ​​corresponding to R, and determines U based on the eigenvectors corresponding to the largest first K eigenvalues ​​among the (N1+N2) eigenvalues, where U is a (N1+N2)×K matrix, K is a positive integer less than or equal to N1, and the value of K can be determined by the terminal based on computing power or predefined by the protocol. Each column in U is an eigenvector.

[0129] Further, it is assumed that at time T+1, the terminal obtains H by measuring the first reference signal 1,T+1 , and obtain H by measuring the second reference signal 2,T+1 The T+1 time is the time when the network device sends the first reference signal and the second reference signal at the same time. The terminal can be based on H 1,T+1 and U Computing Among them, C T+1 is a column vector of length K, is the pseudo-inverse of U1, where U1 is the matrix formed by the first N1 rows of U. Then, the terminal can T+1 and U calculates H T+1 =UC T+1 , and the column vector H T+1 The column vector consisting of the last N2 elements in is denoted as h 2,T+1 , calculate h 2,T+1 and H 2,T+1 The correlation coefficient c1, Among them, h 2,T+1 and H 2,T+1 The correlation coefficient c1 can also be called the correlation coefficient between the first reference signal and the second reference signal.

[0130] Further, if the correlation coefficient between the first reference signal and the second reference signal is greater than a preset threshold value of 0.8, the terminal determines that the channel quality information (channel quality indication, CQI) corresponding to the second reference signal can be obtained based on the first reference signal; if the correlation coefficient between the first reference signal and the second reference signal is greater than the preset threshold value of 0.9, the terminal determines that the precoding matrix indicator (precoding matrix indicator, PMI) corresponding to the second reference signal can be obtained based on the first reference signal; if the correlation coefficient between the first reference signal and the second reference signal is greater than the preset threshold value of 0.95, the terminal determines that all information of the CSI corresponding to the second reference signal can be obtained based on the first reference signal.

[0131] It can be understood that the larger the correlation coefficient between the first reference signal and the second reference signal, the higher the reliability or accuracy of the CSI corresponding to the second reference signal determined based on the first reference signal, and vice versa, the lower the reliability or accuracy of the CSI corresponding to the second reference signal determined based on the first reference signal. The above 0.8, 0.9, and 0.95 are only examples and are not intended to be limiting of this application. In actual applications, the above preset threshold values ​​can be changed according to factors such as the wireless environment.

[0132] Method 2:

[0133] Terminal calculation H 1,t and H 2,t The correlation coefficient c2, Then, T c2 values ​​are obtained and the average of the obtained T c2 values ​​is calculated. 1,t and H 2,t Please refer to the relevant description in the above-mentioned method 1. The average value of the above-mentioned T c2 values ​​can also be called the correlation coefficient between the first reference signal and the second reference signal.

[0134] Among them, if H 1,t The length of the column vector and H 2,t If the lengths of the column vectors are different, that is, N1≠N2, the longer column vectors can be uniformly sampled to calculate the c2 value. It can be understood that the present application does not limit the specific method of sampling.

[0135] For example, H 1,t The length of the column vector of H is 8. 2,t The length of the column vector is 32, so take H 2,t The 1st, 5th, 9th, 13th, 17th, 21st, 25th, 29th elements in each column of form a new column vector H' 2,t ,calculate

[0136] Similar to the above-mentioned method 1, the larger the correlation coefficient between the first reference signal and the second reference signal, the higher the reliability or accuracy of determining the CSI corresponding to the second reference signal based on the first reference signal; conversely, the lower the reliability or accuracy of determining the CSI corresponding to the second reference signal based on the first reference signal.

[0137] Method 3:

[0138] Terminal calculation H 1,t and H 2,t The covariance matrix correlation coefficient c3, in, R 12 H 1,t and H 2,t The cross-covariance matrix of H 1,t and H 2,t The autocovariance matrix of , |·| F is the matrix F-norm. 1,t and H 2,t The covariance matrix correlation coefficient c3 of H can also be called the correlation coefficient between the first reference signal and the second reference signal. 1,t and H 2,t Please refer to the relevant description in the above method 1.

[0139] Further, if the correlation coefficient between the first reference signal and the second reference signal is greater than a preset threshold value of 1 / 4, the terminal determines that the CQI corresponding to the second reference signal can be obtained based on the first reference signal; if the correlation coefficient between the first reference signal and the second reference signal is greater than the preset threshold value of 1 / 3, the terminal determines that the PMI corresponding to the second reference signal can be obtained based on the first reference signal; if the correlation coefficient between the first reference signal and the second reference signal is greater than the preset threshold value of 2 / 5, the terminal determines that all information of the CSI corresponding to the second reference signal can be obtained based on the first reference signal.

[0140] It can be understood that the larger the correlation coefficient between the first reference signal and the second reference signal, the higher the reliability or accuracy of the CSI corresponding to the second reference signal determined based on the first reference signal, and vice versa, the lower the reliability or accuracy of the CSI corresponding to the second reference signal determined based on the first reference signal. The preset threshold values ​​1 / 4, 1 / 3, and 2 / 5 are only examples and are not intended to be limiting of this application. In actual applications, the preset threshold values ​​may be changed according to factors such as the wireless environment.

[0141] It can be understood that the above-mentioned methods 1 to 3 are applicable to any two reference signals among the at least two reference signals, that is, the terminal can use any of the above-mentioned methods to determine whether part or all of the information in the CSI corresponding to one reference signal among the at least two reference signals can be determined based on the other reference signal.

[0142] In addition, the above-mentioned methods 1 to 3 are only examples and are not intended to be limiting of the present application, and the above-mentioned threshold values ​​are also only examples. The above-mentioned methods 1 to 3 are only described by taking the case where the first reference signal and the second reference signal have the same transmission time as an example. In addition, if the absolute value of the difference between the transmission time of the first reference signal and the transmission time of the second reference signal is less than the first preset threshold, the above-mentioned methods 1 to 3 may also be used.

[0143] Furthermore, in a possible implementation, the terminal may also send a correlation coefficient of the first reference signal and the second reference signal to the network device. Exemplarily, the correlation coefficient of the first reference signal and the second reference signal may be included in the first information or sent separately, which is not limited in the present application.

[0144] Step 220: The terminal device sends the first information.

[0145] Exemplarily, the terminal device sends the first information to the network device. Correspondingly, the network device receives the first information from the terminal device.

[0146] The following is an explanation of possible implementation methods of the first information:

[0147] In a possible implementation, when the first information indicates that part of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, the first information may also include an identifier of the part of the information in the CSI corresponding to the second reference signal, or indicate the part of the information in the CSI corresponding to the second reference signal by means of a bitmap. Exemplarily, the part of the information in the CSI corresponding to the second reference signal includes at least one of CQI, PMI, or rank indicator (RI). It can be understood that CQI, PMI, and RI are identifiers of different parts of the information in the CSI, respectively.

[0148] It can be understood that if the first information does not include an identifier of part of the information in the CSI corresponding to the second reference signal, it indicates that all the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal.

[0149] In addition, as a possible implementation method, the range of some information in the CSI corresponding to the second reference signal can also be determined by network device indication or protocol pre-definition. For example, the network device can indicate to the terminal or pre-define through the protocol that some information in the CSI corresponding to the second reference signal includes PMI, and the terminal sends the first information, and reports through 1 bit whether the PMI corresponding to the second reference signal can be determined based on the first reference signal. At this time, the terminal can ignore whether the CQI, RI, etc. corresponding to the second reference signal can be determined by the first reference signal, and only judge whether the PMI corresponding to the second reference signal can be determined based on the first reference signal.

[0150] For another example, the network device may indicate to the terminal or predefine through a protocol that part of the information in the CSI corresponding to the second reference signal includes PMI and CQI, and the terminal sends the first information, and reports through 2 bits whether the PMI and CQI corresponding to the second reference signal can be determined based on the first reference signal. At this time, the terminal may not consider whether the RI corresponding to the second reference signal can be determined by the first reference signal, but only determine whether the PMI and CQI corresponding to the second reference signal can be determined based on the first reference signal.

[0151] In a possible implementation manner, when the number of the at least two reference signals is greater than 2, the first information may include information used to identify the first reference signal and information used to identify the second reference signal.

[0152] For example, at least two reference signals include reference signal 1, reference signal 2, reference signal 3 and reference signal 4, wherein, if the terminal determines that part of the information in the CSI corresponding to reference signal 1 can be determined based on reference signal 3, and the CSI corresponding to reference signal 2 can only be determined based on reference signal 2, the CSI corresponding to reference signal 3 can only be determined based on reference signal 3, and the CSI corresponding to reference signal 4 can only be determined based on reference signal 4, then the first information may also include an identifier of reference signal 1 and an identifier of reference signal 3.

[0153] In a possible implementation, when the number of at least two reference signals is 2, the first information may include indication information for indicating whether part or all of the information in the CSI corresponding to one of the two reference signals can be determined based on the other reference signal. For example, if the transmission periods of the two reference signals are different, the indication information may be 1 bit. When the value of the 1 bit is "1", it indicates that the CSI corresponding to the reference signal with a longer transmission period among the at least two reference signals can be determined based on the reference signal with a shorter transmission period. When the value of the 1 bit is "0", it indicates that the CSI corresponding to the reference signal with a longer transmission period among the at least two reference signals cannot be determined based on the reference signal with a shorter transmission period. Alternatively, if the frequencies of the two reference signals are different, the indication information may be 1 bit. When the value of the 1 bit is "1", it indicates that the CSI corresponding to the reference signal with a higher frequency among the at least two reference signals can be determined based on the reference signal with a lower frequency. When the value of the 1 bit is "0", it indicates that the CSI corresponding to the reference signal with a higher frequency among the at least two reference signals cannot be determined based on the reference signal with a lower frequency.

[0154] It should be understood that the above implementation is only an example and is not intended to be a limitation of the present application.

[0155] In addition, in a possible implementation, before step 210, the network device may also send second information to the terminal, wherein the second information instructs the terminal to feed back the first information. Further, the terminal determines the first information according to at least two reference signals in response to the second information.

[0156] Exemplarily, the second information may be included in the configuration information of at least two reference signals, or sent separately, which is not limited in this application. For example, the second information may occupy 1 bit, and when the value of the 1 bit is "1", it indicates that the terminal is instructed to feedback the first information, and when the value of the 1 bit is "0", it indicates that the terminal does not need to feedback the first information. Among them, the bit field occupied by the second information may be a newly added bit field, or the existing bit field may be reused, which is not limited in this application.

[0157] The second information instructs the terminal to feed back the first information, which can also be described as the second information instructs the terminal to determine whether the CSI corresponding to any one of the at least two reference signals can be determined based on other reference signals.

[0158] Using the above method, the network device sends at least two reference signals. After the terminal receives the at least two reference signals, the terminal determines that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, and then sends the first information to the network device. The terminal determines that part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, so that the terminal can measure only the first reference signal to update the CSI of the antenna port corresponding to the first reference signal and all or part of the CSI of the antenna port corresponding to the second reference signal, that is, the terminal does not need to update the CSI corresponding to the second reference signal every time after measuring the second reference signal. Therefore, the above method can enable the terminal to update and report the CSI more efficiently, thereby improving the efficiency of the terminal updating the CSI according to the reference signal, and at the same time, it can facilitate the network device to schedule CSI reporting more frequently, reduce the aging of the CSI corresponding to the second reference signal, and improve system performance. Correspondingly, the above method can enable the network device to schedule the terminal to report part or all of the information in the CSI corresponding to the second reference signal according to the sending period of the first reference signal after receiving the first information. There is no need to wait until the second reference signal is sent before scheduling the terminal to report the updated CSI corresponding to the second reference signal. Therefore, the above method can enable the network device to obtain CSI more efficiently.

[0159] Generally, at least two reference signals configured by a network device have different transmission periods, and the reference signal with a longer transmission period is more likely to have CSI aging problems. CSI aging, also known as CSI expiration, means that for a reference signal with a longer transmission period, the reporting period of the CSI corresponding to the reference signal is also longer or the CSI of the reference signal pair needs a longer time to be fed back, which makes it impossible for the network device to obtain effective CSI in time, thus affecting system performance.

[0160] In the present application, the transmission period of the first reference signal may be greater than, less than, or equal to the transmission period of the second reference signal.

[0161] For example, the first reference signal is sent in time slot 0, time slot 10, time slot 20, and time slot 30, and the second reference signal is sent in time slot 0, time slot 15, and time slot 30. At this time, the transmission period of the first reference signal (10 time slots) is less than the transmission period of the second reference signal (15 time slots). In the case where part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the terminal can determine part or all of the information in the CSI corresponding to the second reference signal based on the first reference signal received in time slot 10, thereby reducing CSI aging during time slot 10 to time slot 15, and / or the terminal can determine part or all of the information in the CSI corresponding to the second reference signal based on the first reference signal received in time slot 20, thereby reducing CSI aging during time slot 20 to time slot 30.

[0162] For another example, the first reference signal is sent in time slot 0, time slot 15, and time slot 30, and the second reference signal is sent in time slot 0, time slot 10, time slot 20, and time slot 30. At this time, the transmission period of the first reference signal (15 time slots) is less than the transmission period of the second reference signal (10 time slots). In the case where part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the terminal can determine part or all of the information in the CSI corresponding to the second reference signal based on the first reference signal received in time slot 15, thereby reducing CSI aging during time slot 15 to time slot 20.

[0163] Therefore, by adopting the above method, when part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the aging of the CSI corresponding to the second reference signal is reduced and the system performance is improved.

[0164] In the following, when the transmission period of the first reference signal is less than or equal to the transmission period of the second reference signal, two different scenarios are combined to further illustrate how to solve the CSI aging problem, so as to increase the CSI reporting frequency of a longer CSI reporting period and reduce CSI aging.

[0165] In the following scenario 1, the CSI corresponding to the second reference signal is reported periodically. In the following scenario 2, the CSI corresponding to the second reference signal is reported aperiodically. For scenario 1 and scenario 2, the CSI corresponding to the first reference signal may be reported periodically or aperiodically, and this application does not limit this.

[0166] Scenario 1: The CSI corresponding to the second reference signal is reported periodically

[0167] Exemplarily, after the terminal sends the first information, the terminal may send part or all of the information in the CSI corresponding to the second reference signal according to the third period. Accordingly, the network device may receive part or all of the information in the CSI corresponding to the second reference signal according to the third period. It can be understood that part or all of the information in the CSI corresponding to the second reference signal is determined by the first reference signal. In addition, in the case where part of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the terminal sends part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period. Accordingly, the network device receives part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period.

[0168] The third period is greater than or equal to the first period and less than the second period, the first period is the transmission period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal, and the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal. The second period is greater than or equal to the transmission period of the second reference signal. Here, a CSI reporting period in the CSI reporting configuration of the first reference signal is greater than or equal to the transmission period of the first reference signal.

[0169] In a possible scenario, the CSI reporting configuration of the second reference signal includes a CSI reporting period, then the CSI reporting period is greater than or equal to the sending period of the second reference signal, and the CSI reporting period is the second period. At this time, the terminal can determine the third period and notify the network device through the first information. Exemplarily, the first information may also include the third period, or the difference between the third period and the first period, or the difference between the third period and the second period. In addition, the above content may not be carried by the first information, but sent separately, and this application does not limit this. Among them, the terminal can determine the third period based on the correlation coefficient of the above-mentioned first reference signal and the second reference signal. For example, when the correlation coefficient of the first reference signal and the second reference signal is larger, the third period is closer to the first period, the difference between the third period and the first period is smaller, or the third period may be equal to the first period.

[0170] Exemplarily, the transmission period of the first reference signal is 5 time slots, and the CSI reporting configuration of the first reference signal includes a CSI reporting period, which is also 5 time slots. The transmission period of the second reference signal is 20 time slots, and the CSI reporting configuration of the second reference signal includes a CSI reporting period, which is 20 time slots. In the case where part or all of the information of the CSI corresponding to the second reference signal can be determined based on the first reference signal, the terminal determines that the third period is greater than or equal to 5 time slots and less than 20 time slots. The terminal can send a specific value of the third period (for example, 5 time slots or 10 time slots or 15 time slots) to the network device, or the difference between the third period and the first period (for example, the third period differs from the first period by 5 time slots, then the third period is 10 time slots), or the difference between the third period and the second period (for example, the third period differs from the second period by 5 time slots, then the third period is 15 time slots).

[0171] In another possible scenario, the CSI reporting configuration of the second reference signal includes multiple CSI reporting periods, and the CSI reporting configuration of the second reference signal may also include a third period, that is, the multiple CSI reporting periods include the second period and the third period. Among them, the third period is less than the transmission period of the second reference signal. That is to say, when part or all of the information in the CSI corresponding to the second reference signal can be determined based on other signals (such as the first reference signal), the terminal can use the CSI reporting period that is less than the transmission period of the second reference signal to send part or all of the information in the CSI corresponding to the second reference signal. Among them, the CSI reporting period that is less than the transmission period of the second reference signal is greater than or equal to the transmission period of the other reference signal.

[0172] If the number of CSI reporting periods that are smaller than the sending period of the second reference signal is one, the terminal may not need to notify the network device of the CSI reporting period that is smaller than the sending period of the second reference signal.

[0173] If there are multiple CSI reporting periods that are smaller than the sending period of the second reference signal, the terminal can select a CSI reporting period from multiple CSI reporting periods that are smaller than the sending period of the reference signal based on the sending period of the other reference signals, and can notify the network device of the selected CSI reporting period.

[0174] Taking part or all of the information in the CSI corresponding to the second reference signal as an example, determined based on the first reference signal:

[0175] Example 1, assuming that the transmission period of the second reference signal is 20 time slots, if the CSI reporting configuration of the second reference signal includes the CSI reporting period, the CSI reporting period includes 20 time slots and 5 time slots. Among them, 20 time slots are the default CSI reporting period, and 5 time slots are the CSI reporting period that may be used. The CSI reporting period that may be used is applicable to the following scenarios: when part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, and the transmission period of the first reference signal is 5 time slots, part or all of the information in the CSI corresponding to the second reference signal can be reported with a period of 5 time slots.

[0176] Example 2, assuming that the transmission period of the second reference signal is 20 time slots, if the CSI reporting configuration of the second reference signal includes a CSI reporting period, the CSI reporting period includes 20 time slots, 10 time slots, and 5 time slots. Among them, 20 time slots are the default CSI reporting period, and 10 time slots and 5 time slots are CSI reporting periods that may be used. When part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, and the transmission period of the first reference signal is 10 time slots, the terminal can select 10 time slots from the 10 time slots and 5 time slots included in the CSI reporting period as the CSI reporting period for part or all of the information in the CSI corresponding to the second reference signal based on the transmission period of the first reference signal being 10 time slots.

[0177] In another possible scenario, after receiving the first information, the network device reconfigures a CSI reporting period, that is, a third period, for the second reference signal, and the network device sends the third period to the terminal.

[0178] By adopting the above design, the network device can obtain part or all of the information in the CSI corresponding to the second reference signal in a timely manner multiple times, without having to wait until the second reference signal is sent each time to obtain part or all of the information in the CSI corresponding to the updated second reference signal. That is, the terminal does not have to report the CSI every time after measuring the second reference signal, which can shorten the reporting period of part or all of the information in the CSI corresponding to the second reference signal, thereby reducing the aging of the CSI corresponding to the second reference signal and improving the system performance.

[0179] Scenario 2: The CSI corresponding to the second reference signal is reported aperiodically

[0180] Exemplarily, after receiving the first information, the network device may receive part or all of the information in the CSI corresponding to the second reference signal at least twice. The reception time of the part or all of the information in the CSI corresponding to the at least two second reference signals is located between the sending time of two adjacent second reference signals, and the part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0181] The reception time of part or all of the information in the CSI corresponding to the second reference signal can be understood as the time of receiving the above information, or can be understood as the time of receiving the above information minus Z', where Z' is the CSI calculation time specified by the protocol.

[0182] Correspondingly, the terminal may send part or all of the information in the CSI corresponding to the second reference signal at least twice. The sending time of part or all of the information in the CSI corresponding to the at least two second reference signals is located between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0183] In a possible implementation manner, part or all of the information in the CSI corresponding to the at least two second reference signals received by the network device is obtained through non-periodic scheduling.

[0184] Exemplarily, the network device may send fourth information 1, where the fourth information 1 is used to request part or all of the information in the CSI corresponding to the second reference signal. Exemplarily, the fourth information 1 may be DCI 1. The terminal sends part or all of the information in the CSI corresponding to the second reference signal for the first time according to the fourth information 1, which is recorded as part or all of the information 1 in the CSI corresponding to the second reference signal.

[0185] The network device may also send fourth information 2, where the fourth information 2 is used to request part or all of the information in the CSI corresponding to the second reference signal. Exemplarily, the fourth information 2 may be DCI 2. The terminal sends part or all of the information in the CSI corresponding to the second reference signal for the second time according to the fourth information 2, which is recorded as part or all of the information 2 in the CSI corresponding to the second reference signal.

[0186] Among them, the sending time of part or all of the information 1 in the CSI corresponding to the second reference signal and the sending time of part or all of the information 1 in the CSI corresponding to the second reference signal are both located between two adjacent sending times of the second reference signal, and part or all of the information 1 in the CSI corresponding to the second reference signal and part or all of the information 2 in the CSI corresponding to the second reference signal are different.

[0187] For example, Figure 3As shown, assuming that the transmission period of the first reference signal is 5 time slots, the time slot offset of the first reference signal is 0 time slots, the transmission period of the second reference signal is 20 time slots, and the time slot offset of the second reference signal is 0 time slots, the terminal can simultaneously receive the first reference signal and the second reference signal every 20 time slots. After the terminal simultaneously receives the first reference signal and the second reference signal, the terminal receives DCI1, and DCI1 is used to request part or all of the information in the CSI corresponding to the second reference signal. The terminal sends part or all of the information in the CSI corresponding to the second reference signal based on the second reference signal received previously, which is recorded as information 1. If the terminal receives DCI2 after receiving DCI1, DCI2 is used to request part or all of the information in the CSI corresponding to the second reference signal. If the network device has not yet reached the time to send the next second reference signal, but the terminal has received a new first reference signal, the terminal can determine part or all of the information in the CSI corresponding to the second reference signal based on the new first reference signal and the measurement results of the first reference signal and the second reference signal previously received, and send part or all of the information in the CSI corresponding to the second reference signal again, which is recorded as information 2.

[0188] In another possible implementation, part or all of the CSI corresponding to the at least two second reference signals received by the network device may include part or all of the CSI corresponding to the second reference signal obtained through non-periodic scheduling, and may also include part or all of the CSI corresponding to the second reference signal reported through the second period. In this case, the CSI corresponding to the second reference signal may be reported periodically or non-periodically.

[0189] For example, Figure 4 As shown, assuming that the sending period of the first reference signal is 5 time slots, the time slot offset of the first reference signal is 0 time slot, the sending period of the second reference signal is 20 time slots, the time slot offset of the second reference signal is 0 time slot, and the CSI reporting configuration of the second reference signal includes a CSI reporting period of 20 time slots and a time slot offset of 10 time slots, then the terminal can simultaneously receive the first reference signal and the second reference signal every 20 time slots, and the terminal periodically sends the CSI corresponding to the second reference signal, wherein the moment when the terminal sends the CSI corresponding to the second reference signal each time is 10 time slots after the network device sends the second reference signal each time.

[0190] After the terminal simultaneously receives the first reference signal and the second reference signal at a certain time, and before the time when the network device sends the second reference signal next time, the terminal receives DCI 1, where DCI 1 is used to request part or all of the information in the CSI corresponding to the second reference signal. The terminal responds to DCI1 and sends part or all of the information in the CSI corresponding to the second reference signal, which is recorded as information A. In addition, the terminal also sends part or all of the information in the CSI corresponding to the second reference signal according to the CSI reporting configuration of the second reference signal, which is recorded as information B, where information A is different from information B.

[0191] With the above design, the network device can obtain part or all of the information in the CSI corresponding to the second reference signal in a timely manner, without having to wait until the second reference signal is sent each time to schedule the terminal to report the updated CSI corresponding to the second reference signal, thereby reducing the aging of the CSI corresponding to the second reference signal and improving system performance.

[0192] Exemplarily, the following method is a possible implementation manner in which a terminal determines part or all of the information in the CSI corresponding to the second reference signal based on the first reference signal. It should be noted that the following method is only an example and is not intended to be a limitation of the present application.

[0193] The terminal first determines U, and for details, please refer to the relevant description in the above method 1.

[0194] When the CSI corresponding to the second reference signal can be determined based on the first reference signal, the terminal can measure the first reference signal at time t′ to obtain H 1，t’ Wherein, time t′ is the sending time of the first reference signal, and is not the sending time of the second reference signal.

[0195] Terminal based on H 1,t’ and U Computing Among them C t′ is a column vector of length K, is the pseudo-inverse of the matrix U1, where U1 is the matrix formed by the first N1 rows of U. Further, based on C t′ and U, the terminal can calculate H t′ =UC t′ , and H t′ The last N2 elements in each column of 2,t’ , where h 2,t’ That is H 2,t’ That is, at time t′, the terminal cannot measure the second reference signal to obtain H because the network device does not send the second reference signal. 2,t’ , but the terminal can obtain H based on U and the first reference signal measured at time t′ 1,t’ , calculate H 2,t’ The inferred value of h2,t’ . Then the terminal can be based on h 2,t’ The CSI corresponding to the second reference signal is determined by using the existing CSI calculation method.

[0196] In addition, as a possible implementation, the terminal may also send the correlation coefficient of the first reference signal and the second reference signal to the network device, but does not send the first information, and then the network device determines whether part or all of the CSI information corresponding to the second reference signal can be determined based on the first reference signal according to a preset threshold value. When the network device determines that part or all of the CSI information corresponding to the second reference signal can be determined based on the first reference signal, the network device may send third information to the terminal, where the third information is similar to the first information.

[0197] It is understandable that in order to implement the functions in the above embodiments, the network device and the terminal include hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0198] Figure 5 and Figure 6 The following is a schematic diagram of the structure of possible communication devices provided in the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or network device in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be as follows: Figure 1 One of the terminals 120a-120j shown may also be Figure 1 The base station 110a or 110b shown may also be a module (such as a chip) applied to a terminal or a base station.

[0199] like Figure 5 As shown, the communication device 500 includes a processing unit 510 and a transceiver unit 520. The communication device 500 is used to implement the above Figure 2 The functions of the terminal or network device in the method embodiment shown in FIG.

[0200] When the communication device 500 is used to implement Figure 2When the functions of the network device in the method embodiment shown are: the processing unit 510 calls the transceiver unit 520 to execute sending at least two reference signals; receives first information, wherein the first information is used to indicate that part or all of the information in the channel state information CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; the sending period of the first reference signal is less than the sending period of the second reference signal.

[0201] In one possible design, the transceiver unit 520 is used to receive part or all of the information in the CSI corresponding to the second reference signal according to a third period after receiving the first information; wherein the third period is greater than or equal to the first period and less than the second period, the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0202] In one possible design, the CSI reporting configuration of the second reference signal also includes the third period.

[0203] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period.

[0204] In one possible design, the transceiver unit 520 is used to receive, after receiving the first information, part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period.

[0205] In one possible design, the transceiver unit 520 is used to receive part or all of the information in the CSI corresponding to the second reference signal at least twice after receiving the first information, when the CSI corresponding to the second reference signal is non-periodically reported; wherein the reception times of the at least two times are both between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0206] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of channel quality information CQI, precoding matrix indication PMI or rank indication RI.

[0207] In one possible design, the transceiver unit 520 is used to send configuration information of the at least two reference signals before sending the at least two reference signals, wherein the configuration information of the at least two reference signals includes the sending period of the first reference signal and the sending period of the second reference signal.

[0208] In one possible design, the transceiver unit 520 is used to send second information before receiving the first information, and the second information indicates that the terminal feeds back the first information.

[0209] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0210] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0211] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0212] When the communication device 500 is used to implement Figure 2 The functions of the terminal in the method embodiment shown are: a transceiver unit 520, used to receive at least two reference signals; a processing unit 510, used to determine first information based on the at least two reference signals, the first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; the transceiver unit 520 is used to send the first information.

[0213] In one possible design, the transceiver unit 520 is used to send part or all of the information in the CSI corresponding to the second reference signal according to a third period after sending the first information; wherein the third period is greater than or equal to the first period and less than the second period, and the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; and the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

[0214] In one possible design, the CSI reporting configuration of the second reference signal further includes the third period;

[0215] In a possible design, the first information is also used to indicate the third period, or the difference between the third period and the first period.

[0216] In one possible design, the transceiver unit 520 is used to send part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information according to the second period after sending the first information.

[0217] In one possible design, the transceiver unit 520 is used to send part or all of the information in the CSI corresponding to the second reference signal at least twice after sending the first information, when the CSI corresponding to the second reference signal is non-periodically reported; wherein the sending times of the at least two times are between the sending times of two adjacent second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

[0218] In a possible design, when the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of channel quality information CQI, precoding matrix indication PMI or rank indication RI.

[0219] In one possible design, the transceiver unit 520 is used to receive configuration information of the at least two reference signals before receiving the at least two reference signals, wherein the configuration information of the at least two reference signals includes the sending period of the first reference signal and the sending period of the second reference signal.

[0220] In one possible design, the transceiver unit 520 is used to receive second information before sending the first information, and the second information indicates that the terminal feeds back the first information.

[0221] In a possible design, an absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

[0222] In a possible design, an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

[0223] In one possible design, a frequency of the first reference signal is less than a frequency of the second reference signal.

[0224] For more detailed description of the processing unit 510 and the transceiver unit 520, please refer to Figure 2 The relevant description in the method embodiment shown is directly obtained and will not be repeated here.

[0225] like Figure 6As shown, the communication device 600 includes a processor 610 and an interface circuit 620. The processor 610 and the interface circuit 620 are coupled to each other. It is understood that the interface circuit 620 can be a transceiver or an input-output interface. Optionally, the communication device 600 may also include a memory 630 for storing instructions executed by the processor 610 or storing input data required by the processor 610 to execute instructions or storing data generated after the processor 610 executes instructions.

[0226] When the communication device 600 is used to implement Figure 2 When the method is shown, the processor 610 is used to implement the function of the above-mentioned processing unit 510, and the interface circuit 620 is used to implement the function of the above-mentioned transceiver unit 520.

[0227] When the above communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiment. The terminal chip receives information from other modules in the terminal (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal; or the terminal chip sends information to other modules in the terminal (such as a radio frequency module or an antenna), and the information is sent by the terminal to the network device.

[0228] When the above-mentioned communication device is a module applied to a network device, the network device module implements the function of the network device in the above-mentioned method embodiment. The network device module receives information from other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the terminal to the network device; or, the network device module sends information to other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal. The network device module here can be a baseband chip of the network device, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

[0229] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0230] In the present application, another example of a device is provided, the notification device includes at least one processor and at least one memory, the at least one processor is coupled to the at least one memory, the at least one memory is used to store instructions, when the instructions are executed by the at least one processor, the communication device executes the method in the above embodiment. Take the communication device including a processor and a memory as an example, Figure 6 As shown, the communication device 600 includes a processor 610 and a memory 630. The processor 610 and the memory 630 are coupled, and the memory 630 stores instructions. When the instructions stored in the memory 630 are executed by the processor 610, the communication device 600 executes the method executed by the network device or terminal in the above embodiment.

[0231] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. The processor and the storage medium can also be present in a network device or a terminal as discrete components.

[0232] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by 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 programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0233] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0234] In the present application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of the present application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of the present application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0235] It is understood that the various numbers involved in the embodiments of the present application 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 the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A method for determining channel state information, characterized in that: The method includes: sending at least two reference signals; Receive first information, where the first information is used to indicate that part or all of the channel state information CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; and the sending period of the first reference signal is less than the sending period of the second reference signal.

2. The method according to claim 1, characterized in that After receiving the first information, the method further includes: receiving part or all of the information in the CSI corresponding to the second reference signal according to a third period; The third period is greater than or equal to the first period and less than the second period, the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

3. The method according to claim 2, characterized in that The CSI reporting configuration of the second reference signal also includes the third period.

4. The method according to claim 2, characterized in that The first information is further used to indicate the third period, or a difference between the third period and the first period.

5. The method according to any one of claims 2 to 4, characterized in that: After receiving the first information, the method further includes: Part of the CSI corresponding to the second reference signal that is not indicated by the first information is received according to the second period.

6. The method according to claim 1, characterized in that When the CSI corresponding to the second reference signal is reported aperiodically, after receiving the first information, the method further includes: receiving part or all of the information in the CSI corresponding to the second reference signal at least twice; The at least two reception times are both located between two adjacent transmission times of the second reference signal, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

7. The method according to any one of claims 1 to 6, characterized in that: In the case where the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of channel quality information CQI, precoding matrix indication PMI or rank indication RI.

8. The method according to any one of claims 1 to 7, characterized in that: Before sending at least two reference signals, the method further includes: The configuration information of the at least two reference signals is sent, wherein the configuration information of the at least two reference signals includes a sending period of the first reference signal and a sending period of the second reference signal.

9. The method according to any one of claims 1 to 8, characterized in that Before receiving the first information, the method further includes: Sending second information, where the second information instructs the terminal to feed back the first information.

10. The method according to any one of claims 1 to 9, characterized in that: An absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

11. The method according to any one of claims 1 to 10, characterized in that: An absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

12. The method according to any one of claims 1 to 11, characterized in that: The frequency of the first reference signal is lower than the frequency of the second reference signal.

13. A method for determining channel state information, characterized in that: The method includes: receiving at least two reference signals; Determine first information according to the at least two reference signals, where the first information is used to indicate that part or all of the information in the CSI corresponding to the second reference signal is determined based on the first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; The first information is sent.

14. The method according to claim 13, characterized in that After sending the first information, the method further includes: Send part or all of the information in the CSI corresponding to the second reference signal according to a third period; The third period is greater than or equal to the first period and less than the second period, the first period is the sending period of the first reference signal, or a CSI reporting period in the CSI reporting configuration of the first reference signal; the second period is a CSI reporting period in the CSI reporting configuration of the second reference signal.

15. The method according to claim 14, characterized in that The CSI reporting configuration of the second reference signal also includes the third period.

16. The method according to claim 14, characterized in that The first information is further used to indicate the third period, or a difference between the third period and the first period.

17. The method according to any one of claims 14 to 16, characterized in that: After sending the first information, the method further includes: Part of the information in the CSI corresponding to the second reference signal that is not indicated by the first information is sent according to the second period.

18. The method according to claim 13, characterized in that When the CSI corresponding to the second reference signal is reported aperiodically; After sending the first information, the method further includes: Sending part or all of the information in the CSI corresponding to the second reference signal at least twice; The at least two transmission times are both located between two adjacent transmission times of the second reference signals, and part or all of the information in the CSI corresponding to the at least two second reference signals is different.

19. The method according to any one of claims 13 to 18, characterized in that: In the case where the first information indicates partial information in the CSI corresponding to the second reference signal, the first information also includes an identifier of the partial information in the CSI corresponding to the second reference signal, and the partial information in the CSI corresponding to the second reference signal includes at least one of CQI, PMI or RI.

20. The method according to any one of claims 13 to 19, characterized in that: Before receiving at least two reference signals, the method further includes: Configuration information of the at least two reference signals is received, wherein the configuration information of the at least two reference signals includes a transmission period of the first reference signal and a transmission period of the second reference signal.

21. The method according to any one of claims 13 to 20, characterized in that: Before sending the first information, the method further includes: Second information is received, where the second information instructs the terminal to feed back the first information.

22. The method according to any one of claims 13 to 21, characterized in that: An absolute value of a difference between a sending time of the first reference signal and a sending time of the second reference signal is less than or equal to a first preset threshold.

23. The method according to any one of claims 13 to 22, characterized in that An absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.

24. The method according to any one of claims 13 to 23, characterized in that The frequency of the first reference signal is lower than the frequency of the second reference signal.

25. A communication device, characterized in that: The method comprises a unit or a module for executing the method according to any one of claims 1 to 12, or comprises a unit or a module for executing the method according to any one of claims 13 to 24.

26. A communication device, characterized in that: include: One or more processors and one or more memories; wherein the one or more memories store one or more programs, and when the programs are executed by the one or more processors, the device executes the method as described in any one of claims 1-12, or executes the method as described in any one of claims 13-24.

27. A chip system, characterized in that: The chip system includes at least one chip and a memory, and the at least one chip is used to read and execute a program stored in the memory to implement the method as described in any one of claims 1 to 12, or to implement the method as described in any one of claims 13 to 24.

28. A readable storage medium, characterized in that: The readable storage medium includes a program, and when the program is executed on a device, the device executes the method according to any one of claims 1 to 12, or executes the method according to any one of claims 13 to 24.

29. A computer program product comprising instructions, characterized in that When the instructions are executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 12, or execute the method according to any one of claims 13 to 24.

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