CN111817798A - A channel measurement method and communication device - Google Patents

Abstract

The present application provides a channel measurement method and a communication device. The method includes: the terminal device receives first indication information, where the first indication information is used to indicate the first granularity corresponding to the precoding vector. The precoding reference signal transmitted on the resource to be measured is a precoding reference signal of the same port, and the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors. The multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signal transmitted on the same frequency domain unit corresponds to the same precoding vector; The coded reference signal performs channel measurement, and transmits CSI based on the result of the channel measurement. The network device may use different precoding vectors for precoding for the reference signal of the same port, so as to adapt to the frequency selection characteristics of the channel. Therefore, it is beneficial to obtain accurate CSI feedback.

Description

A channel measurement method and communication device

technical field

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

Background technique

In a massive multiple-input multiple-output (massive multiple-input multiple output, Massive MIMO) technology, a network device can reduce interference between multiple users and interference between multiple signal streams of the same user through a precoding technology. Thereby, signal quality is improved, space division multiplexing is realized, and spectrum utilization is improved.

Currently, a channel measurement method is known. For example, the terminal device may perform channel measurement according to the received reference signal, and determine the precoding vector to be fed back. The reference signal received by the terminal device may be a precoded reference signal, which may be referred to as a beamformed reference signal or a precoded reference signal. However, due to the frequency-selective nature of the channel, the network equipment uses the same precoding vector to precode the downlink reference signal on the broadband, and the obtained terminal equipment may not always give feedback on the channel state information (CSI) It can reflect the most real channel state. Therefore, the data transmission performance of the communication system may be degraded.

SUMMARY OF THE INVENTION

The present application provides a channel measurement method and a communication device, so as to obtain accurate feedback of the channel state from a terminal device, thereby improving data transmission performance.

In a first aspect, a channel measurement method is provided. The method can be executed by a terminal device, or can also be executed by a chip configured in the terminal device. This application does not limit this.

Specifically, the method includes: receiving first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used for The pre-configured reference signal on the resource to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple The time-frequency resources used for transmitting the precoding reference signal in the resource block RB, and the relative time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs in the RBs to which they belong The positions are the same; the multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit correspond to the same precoding vector; according to the Channel measurement is performed on the precoding reference signal received on the resource to be measured, and channel state information CSI is sent based on the result of the channel measurement.

In a second aspect, a channel measurement method is provided. The method may be performed by a network device, or may also be performed by a chip configured in the network device. This application does not limit this.

Specifically, the method includes: generating first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used for The pre-configured reference signal on the resource to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple The time-frequency resources used for transmitting the precoding reference signal in the resource block RB, and the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs are in the RBs to which they belong The relative positions are the same; the multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit are precoded by the same precoding vector Encoding is obtained; sending the first indication information.

Therefore, by configuring the first granularity for the resource to be measured, the network device can use different precoding vectors for precoding for reference signals configured on different frequency domain resources for the same CSI-RS resource, so as to be different from the different frequency domain resources. The channel state is adapted to the channel state, so as to adapt to the frequency selection characteristics of the channel. When performing channel measurement, the terminal device may independently perform channel measurement based on the frequency domain unit corresponding to the first granularity. Therefore, it is beneficial to obtain accurate feedback on the channel state when the channel frequency selection characteristic is obvious. Therefore, it is beneficial to improve the data transmission performance of the system.

With reference to the first aspect, in some possible implementations of the first aspect, the method further includes: receiving second indication information, where the second indication information is used to indicate that the resource to be measured is configured with the first indication a granularity.

Correspondingly, in some possible implementations of the second aspect, the method further includes: sending second indication information, where the second indication information is used to indicate that the resource to be measured is configured with the first granularity.

That is, the network device can autonomously choose whether to configure the first granularity for the resource to be measured, that is, whether to configure different precoding vectors on different frequency domain units for the resource to be measured. The terminal device may determine a channel measurement method based on the second indication information. For example, when the frequency domain resources occupy a large bandwidth and the frequency selection feature is obvious, the network device can use different precoding vectors to precode the reference signal of the same port, and the terminal device can use independent processing. measurement to obtain the feedback of the channel state that better matches the channel frequency selection characteristics; when the frequency domain resources occupy a small bandwidth and the frequency domain correlation is good, the network device can use the same precoding vector for the reference signal of the same port. During precoding, the terminal device may also perform channel measurement in a joint processing manner to improve measurement accuracy. Therefore, it can adapt to frequency domain resources of different bandwidths to meet different needs, and the handover is very flexible. At the same time, more accurate feedback of channel state information can also be obtained, which is beneficial to improve data transmission performance.

With reference to the first aspect or the second aspect, in some possible implementations, the precoding reference signals transmitted on at least two frequency domain units in the resource to be measured correspond to different precoding vectors.

That is, in the multiple frequency domain units corresponding to the first granularity, the precoding vectors corresponding to each frequency domain unit may be the same or different. The precoding reference signal transmitted on each frequency domain unit may be obtained by precoding the reference signal based on the same or different precoding vectors. This application does not limit this.

In a possible design, the precoding vectors corresponding to the precoding reference signals transmitted on each frequency domain unit in the resource to be measured are different from each other.

That is, a different precoding vector may be configured for each frequency domain unit corresponding to the first granularity to generate a precoding reference signal. The precoding vector corresponding to each frequency-domain unit can be adapted to the channel state of the frequency-domain unit, thereby facilitating accurate feedback from the terminal device.

With reference to the first aspect or the second aspect, in some possible implementations, the first granularity is the same as the second granularity, and the second granularity is the granularity of the frequency domain unit on which the CSI reporting is based.

That is, the granularity of the frequency domain unit corresponding to the precoding vector and the granularity of the frequency domain unit corresponding to the CSI reporting may be the same granularity. In this case, the first granularity and the second granularity can be simultaneously combined by only one field. Optionally, the first granularity and the second granularity are indicated by the same field. Indicating two granularities through the same field is beneficial to saving signaling overhead.

Of course, when the first granularity is the same as the second granularity, the first granularity and the second granularity may also be indicated by different fields or different signaling, which is not limited in this application.

With reference to the first aspect or the second aspect, in some possible implementation manners, the first indication information is carried in the CSI reporting configuration.

For example, the first indication information may be a field carried in the CSI reporting configuration, for example, an existing field may be reused, or a new field may be added. This application does not limit this.

With reference to the first aspect or the second aspect, in some possible implementations, the frequency domain unit is a subband, and the first indication information is carried by a subband granularity field in the CSI reporting configuration.

That is, the first indication information may be carried by the subband granularity field in the CSI reporting configuration defined in the existing protocol. In this case, the granularity indicated by the subband granularity is also the first granularity or the second granularity described above.

With reference to the first aspect or the second aspect, in some possible implementation manners, the first indication information is carried in the channel state information reference signal CSI-RS resource mapping configuration.

For example, the first indication information may carry a field in the CSI-RS resource mapping configuration, for example, an existing field may be multiplexed, or a new field may be added. This application does not limit this.

Two possible signalings for carrying the first indication information are listed above. However, this should not constitute any limitation to this application. This application does not limit the specific signaling used to carry the first indication information.

In a third aspect, a channel measurement method is provided. The method can be executed by a terminal device, or can also be executed by a chip configured in the terminal device. This application does not limit this.

Specifically, the method includes: receiving second indication information, where the second indication information is used to indicate whether a resource to be measured is configured with a first granularity; the resource to be measured includes a plurality of resource blocks RB used for transmission precoding the time-frequency resources of the reference signal, and the time-frequency resources used to transmit the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when When the resource to be measured is configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and corresponds to the first granularity The precoding reference signal transmitted on one frequency domain unit of the The reference signal is obtained by precoding; channel measurement is performed according to the precoded reference signal received on the resource to be measured, and channel state information CSI is sent based on the channel measurement result.

In a fourth aspect, a channel measurement method is provided. The method may be performed by a network device, or may also be performed by a chip configured in the network device. This application does not limit this.

Specifically, the method includes: generating second indication information, where the second indication information is used to indicate whether a first granularity is configured for the resource to be measured; the resource to be measured includes a plurality of resource blocks RB used for transmission precoding the time-frequency resources of the reference signal, and the time-frequency resources used to transmit the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when When the resource to be measured is configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and corresponds to the first granularity The precoding reference signal transmitted on one frequency domain unit of the The reference signal is obtained by precoding; and the second indication information is sent.

Therefore, the terminal device may determine, based on the second indication information, whether the network device is configured with the first granularity for the resource to be transmitted. That is, whether to configure different precoding vectors on different frequency domain units for the resource to be measured. The terminal device may determine a channel measurement method based on the second indication information. For example, when the frequency domain resources occupy a large bandwidth and the frequency selection feature is obvious, the network device can use different precoding vectors to precode the reference signal of the same port, and the terminal device can use independent processing. measurement to obtain the feedback of the channel state that better matches the channel frequency selection characteristics; when the frequency domain resources occupy a small bandwidth and the frequency domain correlation is good, the network device can use the same precoding vector for the reference signal of the same port. During precoding, the terminal device may also perform channel measurement in a joint processing manner to improve measurement accuracy. Therefore, it can adapt to frequency domain resources of different bandwidths to meet different needs, and the handover is very flexible. At the same time, more accurate feedback of channel state information can also be obtained, which is beneficial to improve data transmission performance.

With reference to the first to fourth aspects, in some possible implementations, the precoding reference signals transmitted in the resources to be measured correspond to the same port.

The same port may refer to a port corresponding to a reference signal carried on multiple REs with the same relative position on each RB in the same CSI-RS resource. The reference signal referred to here may be, for example, a precoding reference signal. In this embodiment of the present application, the precoding reference signal of the same port may be obtained by precoding based on different precoding vectors. That is, the precoding reference signals of the same port may correspond to different precoding vectors.

In a fifth aspect, a communication apparatus is provided, including each module or unit for performing the method in the first aspect or the third aspect and any possible implementation manner of the first aspect or the third aspect.

In a sixth aspect, a communication apparatus is provided, including a processor. The processor is coupled to the memory and can be used to execute instructions in the memory to implement the method of the first aspect or the third aspect and any one of the possible implementations of the first aspect or the third aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

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

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

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

In a seventh aspect, a communication apparatus is provided, including various modules or units for performing the method in the second aspect or the fourth aspect and any possible implementation manner of the second aspect or the fourth aspect.

In an eighth aspect, a communication apparatus is provided, including a processor. The processor is coupled to the memory and can be used to execute instructions in the memory to implement the method of the second aspect or the fourth aspect and any possible implementation of the second aspect or the fourth aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

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

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

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

In a ninth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect method in .

In the specific implementation process, the above-mentioned processor may be one or more chips, the input circuit may be input pins, the output circuit may be output pins, and the processing circuit may be transistors, gate circuits, flip-flops and various logic circuits, etc. . The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and output The circuit can be the same circuit that acts as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In a tenth aspect, a processing apparatus is provided, including a processor and a memory. The processor is configured to read the instructions stored in the memory, and can receive signals through the receiver and transmit signals through the transmitter, so as to execute the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect Methods.

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

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

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

It should be understood that the relevant data interaction process, such as sending indication information, may be a process of outputting indication information from the processor, and receiving capability information may be a process of receiving input capability information by the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the receiver. Among them, the transmitter and the receiver may be collectively referred to as a transceiver.

The processing device in the tenth aspect above may be one or more chips. The processor in the processing device may be implemented by hardware or by software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, implemented by reading software codes stored in a memory, which can Integrated in the processor, can be located outside the processor, independent existence.

In an eleventh aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instructions), which, when the computer program is executed, causes a computer to execute the above-mentioned first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth aspect.

In a twelfth aspect, a computer-readable medium is provided, the computer-readable medium stores a computer program (also referred to as code, or instruction) when it is run on a computer, causing the computer to execute the above-mentioned first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth aspect.

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

Description of drawings

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

2 is a schematic diagram of a correspondence between CSI-RS resources, ports and precoding vectors provided by an embodiment of the present application;

3 is a schematic diagram of time-frequency resources of precoding reference signals of multiple ports in multiple RBs provided by an embodiment of the present application;

4 is a schematic flowchart of a method provided by an embodiment of the present application;

5 is a schematic diagram of a correspondence between resources to be measured, ports and precoding vectors provided by an embodiment of the present application;

6 is a schematic diagram of a first granularity and a second granularity provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a channel measurement method provided by another embodiment of the present application;

8 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application;

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

FIG. 10 is a schematic structural diagram of a network device provided by an embodiment of the present application.

Detailed ways

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

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a global system for mobile communications (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (wideband) system code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (long termevolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, future fifth generation (5th generation, 5G) system or new Wireless (new radio, NR) and so on.

To facilitate understanding of the embodiments of the present application, firstly, a communication system applicable to the embodiments of the present application is described in detail by taking the communication system shown in FIG. 1 as an example. FIG. 1 is a schematic diagram of a communication system 100 suitable for a vector indication method for constructing a precoding vector according to an embodiment of the present application. As shown in FIG. 1 , the communication system 100 may include at least one network device, such as the network device 110 shown in FIG. 1 ; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in FIG. 1 . The network device 110 and the terminal device 120 may communicate via a wireless link. Each communication device, such as the network device 110 or the terminal device 120, may be configured with multiple antennas. For each communication device in the communication system 100, the configured plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Therefore, communication between various communication devices in the communication system 100, such as between the network device 110 and the terminal device 120, can be communicated through the multi-antenna technology.

It should be understood that the network device in the wireless communication system may be any device with a wireless transceiver function. The equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), Radio Network Controller (RadioNetwork Controller, RNC), Node B (Node B, NB), Base Station Controller (Base Station Controller, BSC), Base Transceiver Station (BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), baseband unit (BaseBand Unit, BBU), access point in a wireless fidelity (Wireless Fidelity, WIFI) system (Access Point, AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc., and can also be 5G, such as NR, in the system The gNB, or, the transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of the base station in the 5G system, or, it can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or, distributed unit (distributed unit, DU), etc.

In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (active antenna unit, AAU for short). CU implements some functions of gNB, and DU implements some functions of gNB. For example, CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) layer. function. The DU is responsible for processing physical layer protocols and real-time services, and implementing functions of a radio link control (radio link control, RLC) layer, a media access control (media access control, MAC) layer, and a physical (physical, PHY) layer. AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, therefore, in this architecture, the higher-layer signaling, such as the RRC layer signaling, can also be considered to be sent by the DU. , or, sent by DU+AAU. It can be understood that the network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), and the CU may also be divided into network devices in a core network (core network, CN), which is not limited in this application. It should also be understood that the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user Terminal, terminal, wireless communication device, user agent or user equipment. The terminal device in the embodiments of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, and an augmented reality (augmented reality, AR) terminal device , wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation security Wireless terminals in safety), wireless terminals in smart cities, wireless terminals in smart homes, wireless terminals configured in vehicles, and so on. The embodiments of the present application do not limit application scenarios.

It should also be understood that FIG. 1 is only a simplified schematic diagram for easy understanding, and the communication system 100 may also include other network devices or other terminal devices, which are not shown in FIG. 1 .

To facilitate understanding of the embodiments of the present application, the following briefly describes the processing process of the downlink signal at the physical layer before sending. It should be understood that the processing of the downlink signal described below may be performed by a network device, or may be performed by a chip configured in the network device. For convenience of description, hereinafter collectively referred to as network devices.

The network device may process code words on the physical channel. The codewords may be coded bits that have been coded (eg, including channel coding). The codeword is scrambled to generate scrambled bits. The scrambled bits are subjected to modulation mapping to obtain modulation symbols. Modulation symbols are mapped to multiple layers, or transport layers, through layer mapping. The modulation symbols after layer mapping are precoded to obtain a precoded signal. The precoded signal is mapped to multiple REs after being mapped by resource elements (resource elements, REs). These REs are then modulated by orthogonal frequency division multiplexing (OFDM) and then transmitted through an antenna port (antenna port).

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

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

1. Channel state information (CSI) report (report): In a wireless communication system, a channel attribute used to describe a communication link reported by a receiving device (such as a terminal device) to a sending device (such as a network device) Information. The CSI report may also be referred to as CSI for short. In this embodiment of the present application, CSI report and CSI may express the same meaning.

For example, CSI may include, but is not limited to, precoding matrix indicator (PMI), rank indication (RI), channel quality indicator (CQI), channel state information reference (channel state information reference) signal, CSI-RS resource indicator (CSI-RS resource indicator, CRI), layer indicator (layer indicator, LI), etc. It should be understood that the specific contents included in the CSI reports listed above are only exemplary descriptions, and should not apply to this application. Any limitation is constituted. The CSI report may include one or more of the above-listed information, and may also include other information used to characterize CSI in addition to the above-listed information, which is not limited in this application.

Take the terminal equipment reporting CSI to the network equipment as an example. A terminal device may report one or more CSI reports in a time unit (eg, a slot), and each CSI report may correspond to a configuration condition of CSI reporting. The configuration condition of the CSI report may be determined by, for example, a CSI report configuration (CSI-ReportConfig). The terminal device may generate a CSI report based on a CSI report configuration.

2. CSI reporting configuration: a resource for channel measurement (resourceForChannelMeasurement) can be configured. A CSI resource configuration identifier (CSI-ResourceConfigId) can be associated with the CSI reporting configuration to associate one or more resource sets defined by the CSI resource configuration, such as non-zero power (NZP) CSI - RS resource sets (NZP-CSI-RS-ResourceSets). Since each resource set may include one or more resources, one or more resources may be associated with one CSI reporting configuration. For example, each NZP-CSI-RS resource set may include one or more NZP-CSI-RS resources (NZP-CSI-RS resources), and the same CSI reporting configuration may be associated with one or more NZP-CSI-RS resources. Since zero power (ZP)-CSI-RS is not involved in this application, NZP-CSI-RS is abbreviated as CSI-RS. In other words, the embodiment of the CSI-RS resource in the embodiment of the present application in the protocol may specifically be the NZP-CSI-RS resource.

The CSI-RS resource can be determined by configuring the identifier of the associated CSI resource configuration in the CSI report. The CSI-RS resource can be used to configure the transmission properties of the CSI-RS. For example, time-frequency resource location, port mapping relationship, power factor, and scrambling code, etc. For details, refer to the prior art. The network device may send the CSI-RS based on the CSI-RS resource, and the terminal device may receive the CSI-RS based on the CSI-RS resource.

Based on the CSI-RS resource, the time-frequency resource used to bear the reference signal may be determined, and may specifically be a resource element (resource element, RE). In the embodiments of the present application, for the convenience of distinction and description, the time-frequency resources used to bear the reference signal are recorded as the resources to be measured. The reference signal transmitted through the resource to be measured is used for channel measurement. For example, the network device may configure the resource to be measured for the terminal device through the above-mentioned CSI resource configuration. In other words, the terminal device may, for example, determine the resource to be measured through the above-mentioned CSI resource configuration.

In a possible design, the CSI reporting configuration may be an information element (information element, IE) in the RRC message. In other words, the CSI reporting configuration can be carried in the RRC message. This application does not limit the signaling carrying the CSI reporting configuration. Meanwhile, this application does not limit the name of the CSI reporting configuration. This application does not exclude the possibility of using other possible terms to replace the CSI reporting configuration to achieve the same or similar functions.

In addition, the CSI resource configuration is the configuration signaling used to configure the transmission resources of the CSI-RS in the current protocol. For example, it can be carried in an RRC message. However, it should be understood that the present application also does not limit the configuration signaling for configuring the transmission resources of the CSI-RS. The signaling for configuring CSI-RS transmission resources may be CSI-RS resource configuration or other signaling. Meanwhile, the present application does not limit the specific signaling carrying the CSI resource configuration. Meanwhile, this application also does not limit the name of the CSI resource configuration. This application does not exclude the possibility of using other possible properties to replace the CSI resource configuration to achieve the same or similar functions.

3. Precoding reference signal: also known as a beamformed reference signal. The beamforming reference signal may be a precoded reference signal, which may be similar to a Class B (Class B) reference signal in the LTE protocol. In contrast, the reference signal without precoding processing may be similar to the Class A (Class A) reference signal in the LTE protocol.

In the embodiments of the present application, for the convenience of distinction and description, the precoded reference signal is referred to as a precoded reference signal; the unprecoded reference signal is simply referred to as a reference signal.

It should be understood that the reference signal involved in this embodiment of the present application may be a reference signal used for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS). However, it should be understood that the above enumeration is only an example, and should not constitute any limitation to the present application, and the present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

4. Antenna port: referred to as port. It can be understood as a virtual antenna recognized by the receiving end. Or spatially distinguishable transmit antennas. One antenna port can be configured for each virtual antenna, each virtual antenna can be a weighted combination of multiple physical antennas, and each antenna port can correspond to a reference signal, therefore, each antenna port (or port for short) can be referred to as A reference signal port.

Reference signals on the same port (including unprecoded reference signals and precoded reference signals) may refer to time-frequency resources used to carry reference signals, such as resource elements (resource elements, REs), in multiple transport blocks. (resource block, RB) have the same relative position. Specifically, it may mean that, in any two RBs used to transmit reference signals of the same port, the distances between the REs used to carry the reference signals are the same with respect to the starting position of the frequency domain of the RB to which they belong, and the distance from the REs used to carry the reference signal is the same as the time of the RB to which they belong. The distance from the start of the domain is the same. For example, in any two RBs used to transmit the reference signal of the same port, the REs used to carry the reference signal have the same number of subcarriers as the starting subcarrier interval of the RB to which they belong, and are the same as the starting subcarriers of the respective RBs. The number of symbols is also the same. In simple terms, the reference signals of the same port correspond to time-frequency resources with the same relative position in multiple RBs.

In this embodiment of the present application, an antenna port may refer to a port of a precoded reference signal. In the current technology, the reference signal of each port may be a precoding reference signal obtained by precoding the reference signal based on the same precoding vector. The precoding reference signal for each port may be transmitted through one or more RBs. In other words, the precoding reference signal of the same port transmitted on the resource to be measured may be obtained by precoding the reference signal based on the same precoding vector.

FIG. 2 shows an example of the correspondence between CSI-RS resources, ports, and precoding vectors. As mentioned above, the terminal device may determine the time-frequency resources used to carry the reference signal, that is, the above-mentioned resources to be measured, according to the CSI-RS resource configuration. The reference signal transmitted based on the CSI-RS resource may be CSI-RS. In this embodiment of the present application, the CSI-RS may be precoded CSI-RS. The port corresponding to the CSI-RS may be a CSI-RS port.

The network device may configure one or more CSI-RS resources for one CSI-RS resource set. FIG. 2 shows an example in which one CSI-RS resource set includes two CSI-RS resources. A precoding reference signal corresponding to one or more ports may be transmitted based on one CSI-RS resource. FIG. 2 shows an example in which a precoding reference signal transmitted based on one CSI-RS resource corresponds to one port. The frequency domain occupied bandwidth of each CSI-RS resource may include one or more subbands, and each subband may include one or more RBs.

Specifically, the precoding reference signal transmitted based on CSI-RS resource 1 corresponds to CSI-RS port 1. The precoding reference signal corresponding to port 1 may be obtained by precoding the reference signal by precoding vector 1 . The precoding reference signal corresponding to port 1 is mapped to subband 1 and subband 2. That is to say, the ports corresponding to the precoding reference signals transmitted in subband 1 and subband 2 are configured by CSI-RS resource 1 .

The precoding reference signal transmitted based on CSI-RS resource 2 corresponds to CSI-RS port 2. The precoding reference signal corresponding to port 2 may be obtained by precoding the reference signal by precoding vector 2 . The precoding reference signal corresponding to port 2 is mapped to subband 3 and subband 4. That is to say, the ports corresponding to the precoding reference signals transmitted in subband 3 and subband 4 are configured by CSI-RS resource 2 .

In an implementation manner, the precoding reference signal corresponding to the same port is always obtained by precoding the reference signal with the same precoding vector in the frequency domain occupied bandwidth of the CSI-RS resource. Therefore, when the precoding reference signal transmitted based on a certain CSI-RS resource corresponds to one port, the precoding reference signal transmitted based on the CSI-RS resource can be obtained by precoding the reference signal based on a precoding vector.

It should be understood that FIG. 2 is only an example, showing an example in which a precoding reference signal transmitted based on one CSI-RS resource corresponds to one port. In fact, the precoding reference signal transmitted based on one CSI-RS resource may also correspond to multiple ports. When the precoding reference signal transmitted based on one CSI-RS resource corresponds to multiple ports, in the multiple RBs included in the frequency domain occupied bandwidth of the CSI-RS resource, the precoding reference signal transmitted on each RB can be Corresponds to multiple ports. The precoding reference signal of each port is carried in multiple RBs through time-frequency resources with the same relative position. And the precoding reference signals of the multiple ports in the same RB can be used to distinguish different ports by, for example, time division multiplexing (time division multiplexing, TDM) or frequency division multiplexing (frequency division multiplexing, FDM) and other methods.

As mentioned above, the resource to be measured is the time-frequency resource used to carry the reference signal of the same port. When the resource determined based on the CSI-RS resource includes multiple RBs, the resource to be measured may include multiple REs distributed in the multiple RBs. That is, the resource to be measured may correspond to multiple RBs. Among the multiple RBs, the relative positions of the time-frequency resources used to carry the precoding reference signals of the same port in the respective RBs are the same. FIG. 3 shows an example of time-frequency resources of precoding reference signals of multiple ports in multiple RBs. As shown, two sub-bands, sub-band 1 and sub-band 2, are exemplarily shown in FIG. 3 . Subband 1 includes RB1 and RB2, and subband 2 includes RB3 and RB4. The two subbands are configured by the same CSI-RS resource, and can be used to transmit reference signals of 4 ports, such as including port 1 to port 4. As shown in FIG. 3 , the relative positions of the REs occupied by the reference signals of the same port are the same in the RBs to which they belong. REs with the same shading in Figure 3 correspond to the same port. For example, the REs occupied by the reference signal of port 1 occupy the first subcarrier and the first symbol of each RB in RB 1, RB 2, RB 3 and RB 4. By analogy, I will not list them one by one here. Therefore, the REs with the same shade in FIG. 3 can be regarded as an example of the resource to be measured. Four resources to be measured corresponding to four ports are shown in FIG. 3 .

It should be understood that FIG. 3 is only for ease of understanding, and shows several examples of resources to be measured. However, this should not constitute any limitation to this application. The number of RBs corresponding to the resource to be measured in the frequency domain is not limited to that shown in FIG. 3 . When the network device configures the terminal device with a reference signal of one or more ports through one CSI-RS resource, the RBs distributed by the REs used to carry the reference signal of the same port all correspond to the resource to be measured.

However, considering the frequency-selective characteristics of the channel, if the same precoding vector is used to precode the reference signal in the wideband, the obtained feedback may not necessarily reflect the most real channel state. This situation may be particularly evident in, for example, frequency division duplexing (FDD) mode. Therefore, it is desirable to use different precoding vectors to precode the reference signal on different frequency domain resources.

In order to introduce different precoding vectors to precode reference signals transmitted on different frequency domain resources, for example, the network device can configure more CSI-RS resources for the terminal device according to the method described above, and configure more CSI-RS resources for each CSI - The RS resource configures the precoding reference signal of one or more ports, and the precoding reference signal of each port corresponds to one port. For example, if the network device wishes to use different precoding vectors to precode the reference signals carried on the time-frequency resources at the same relative position in subband 1, subband 2, subband 3, and subband 4, respectively, the subband 1, subband 2, subband 3, and subband 4 can be respectively Band 1, sub-band 2, sub-band 3 and sub-band 4 are configured with one CSI-RS resource. That is, it is configured by four CSI-RS resources.

It can be seen that if more precoding vectors are introduced to precode the reference signal, more CSI-RS resources need to be configured. This will greatly increase the signaling overhead for configuring CSI-RS resources.

Based on this, the present application provides a channel measurement method, in order to use different precoding vectors on different frequency domain resources to precode the reference signal, so as to obtain accurate feedback of the channel state from the terminal device without bringing overhead. a substantial increase.

The channel measurement method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Before introducing the embodiments of the present application, the following points are first made.

First, in this embodiment, for the convenience of description, when the numbering is involved, the numbering may start from 1 consecutively. For example, the K CSI-RS resources may include CSI-RS resource 1 to CSI-RS resource K. The N subbands may include subband 1 to subband N, and so on. And so on. For the sake of brevity, no examples are provided here. Of course, the specific implementation is not limited to this, for example, the numbers can also be consecutively numbered from 0. It should be understood that the above descriptions are all settings for the convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Second, in this embodiment of the present application, "for indicating" may include direct indicating and indirect indicating. For example, when describing a certain indication information for indicating information I, the indication information may directly indicate I or indirectly indicate I, but it does not mean that the indication information must carry I.

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

In addition, the specific indication manner may also be various existing indication manners, such as, but not limited to, the above indication manner and various combinations thereof. For the specific details of the various indication modes, reference may be made to the prior art, and details are not described herein again. It can be seen from the above that, for example, when multiple pieces of information of the same type need to be indicated, different information may be indicated in different manners. In the specific implementation process, the required indication mode can be selected according to specific needs. The selected indication mode is not limited in this embodiment of the present application. In this way, the indication mode involved in the embodiment of the present application should be understood as covering the ability to make the indication to be indicated. Various methods for the party to learn the information to be indicated.

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

Third, in the embodiments shown below, the first, second, and various numeral numbers are only used to distinguish for convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, different indication information, different granularity, etc. are distinguished.

Fourth, in the embodiments shown below, "pre-definition" can be achieved by pre-saving corresponding codes, tables or other means that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), This application does not limit its specific implementation. Wherein, "saving" may refer to saving in one or more memories. The one or more memories may be provided separately, or may be integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partially provided separately and partially integrated in the decoder, processor, or communication device. The type of memory may be any form of storage medium, which is not limited in this application.

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

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

Seventh, the embodiments of the present application are only for the convenience of understanding, and the channel measurement method provided by the present application is described in detail by taking the CSI-RS as an example of a reference signal used for channel measurement. Correspondingly, the transmission resource of the CSI-RS can be configured through CSI-RS resource configuration or the like. However, this should not constitute any limitation to this application. For example, the above-mentioned CSI-RS can also be replaced by SRS or a signal that can be used to achieve the same or similar functions. The corresponding CSI-RS resources can also be replaced with SRS resources or reference signal resources that can be used to implement the same or similar functions.

The channel measurement method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The methods provided in the embodiments of the present application may be applied to a system that communicates through a multi-antenna technology, for example, the communication system 100 shown in FIG. 1 . The communication system may include at least one network device and at least one terminal device. Communication between network equipment and terminal equipment is possible through multi-antenna technology.

It should be understood that the methods provided in the embodiments of the present application are not limited to the communication between the network device and the terminal device, and can also be applied to the communication between the terminal device and the terminal device, and the like. The present application does not limit the scenarios in which the method is applied. In the embodiments shown below, for ease of understanding and description, the channel measurement method provided by the embodiments of the present application is described in detail by taking the interaction between a network device and a terminal device as an example.

It should also be understood that the embodiments shown below do not particularly limit the specific structure of the execution body of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be executed according to the present application. The method provided by the embodiment of the application can be used for communication. For example, the execution body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute a program.

Hereinafter, without loss of generality, the channel measurement method provided by the embodiment of the present application is described in detail by taking the interaction between the network device and the terminal device as an example.

FIG. 4 is a schematic flowchart of a channel measurement method 400 provided by an embodiment of the present application from the perspective of device interaction. As shown in FIG. 4 , the method 400 may include steps 410 to 460 . The steps in the method 400 are described in detail below.

In step 410, the network device generates first indication information, where the first indication information is used to indicate the first granularity.

Specifically, the first granularity is defined for the convenience of being distinguished from the CSI reporting granularity mentioned later. In this embodiment of the present application, the first granularity is the granularity corresponding to the precoding vector. The precoding vector mentioned here may refer to a precoding vector used for precoding the reference signal transmitted on the preconfigured resource to be measured. In this embodiment of the present application, the first granularity may refer to frequency domain granularity. Based on the first granularity, multiple RBs corresponding to the resource to be measured in the frequency domain may be divided into one or more frequency domain units. Each frequency domain unit may include one or more RBs. Each frequency domain unit may be referred to as a subband. The frequency domain units divided based on the first granularity may be referred to as subbands corresponding to the first granularity.

Wherein, the multiple RBs corresponding to the resource to be measured in the frequency domain may refer to, when the reference signal is configured by the CSI-RS resource, the REs that are configured by the same CSI-RS resource and have the same relative position in each RB are distributed of multiple RBs. For example, one resource to be measured in FIG. 3 may include 4 RBs, that is, RB 1 to RB 4 .

In the resource to be measured, the precoding reference signal transmitted on each subband can be obtained by precoding the reference signal by the same precoding vector. The precoding reference signals of the same port transmitted on different subbands may be obtained by precoding the reference signals with the same precoding vector, or may be obtained by precoding the reference signals with different precoding vectors. Therefore, the precoding reference signal transmitted on the multiple RBs corresponding to the resource to be measured may be obtained by precoding the reference signal by one or more precoding vectors. Simply put, the above-mentioned first granularity is the granularity corresponding to the precoding vector.

In this embodiment of the present application, the precoding reference signal carried by one resource to be measured corresponds to the same port. That is to say, in a resource to be measured, although the precoding reference signal may be obtained by precoding the reference signal through different precoding vectors, it can still be defined as the precoding reference signal of one port. However, it should be understood that defining the precoding reference signal carried by the resource to be measured as the precoding reference signal of one port is only a possible way of definition, and should not constitute any limitation to this application. The present application also does not exclude the possibility that, in future protocols, multiple REs with the same relative positions in multiple RBs used for transmitting reference signals in the same CSI-RS resource configuration carry precoding reference signals of multiple ports. In this case, the same precoding vector may correspond to one port. Those skilled in the art can understand that no matter how the port is defined, it does not affect the understanding of the first granularity corresponding to the precoding vector in this application. In the following, for ease of understanding and description, the precoding reference signal carried by one resource to be measured is defined as the precoding reference signal of one port.

For ease of understanding, the relationship between ports, subbands and precoding reference signals will be described in detail below with reference to the accompanying drawings. FIG. 5 shows the correspondence between ports, subbands and precoding vectors. As shown in FIG. 4 , the network device may configure one or more CSI-RS resources for one CSI-RS resource set. FIG. 4 shows an example in which a network device configures one CSI-RS resource for one CSI-RS resource set. A precoding reference signal transmitted on one CSI-RS resource may correspond to one or more ports. FIG. 4 shows an example in which the precoding reference signal transmitted on the CSI-RS resource corresponds to one port. The RB corresponding to the resource to be measured determined based on the CSI-RS resource in the frequency domain may be divided into 4 subbands based on the first granularity, that is, subband 1 to subband 4 are included. It can be understood that the relative positions of the REs used to carry the precoding reference signal in the four subbands in the RBs to which they belong are the same. The precoding reference signals transmitted in the 4 subbands may correspond to the same port, such as port 1 as shown in FIG. 4 .

Each subband in FIG. 4 may correspond to a precoding vector. The precoding reference signal transmitted on each subband may be obtained by precoding the reference signal based on a precoding vector. As shown in FIG. 4 , the precoding reference signal corresponding to port 1 in subband 1 may be obtained by precoding the reference signal by precoding vector 1 . The precoding reference signal corresponding to port 1 in subband 2 may be obtained by precoding the reference signal by precoding vector 2 . The precoding reference signal corresponding to port 1 in subband 3 may be obtained by precoding the reference signal by precoding vector 3 . The precoding reference signal corresponding to port 1 in subband 4 may be obtained by precoding the reference signal by precoding vector 4 . By analogy, for the sake of brevity, they will not be listed here.

It should be understood that the precoding vectors acting on different subbands may be the same or different. For example, the four precoding vectors in the precoding vector 1 to the precoding vector 4 may be different from each other, may be partially the same, or may be completely the same.

It should be noted that although the precoding vectors acting on different subbands may be exactly the same, for example, the four precoding vectors in the preceding precoding vector 1 to precoding vector 4 are the same precoding vector, the terminal device still considers that the The precoding reference signals received on the four subbands are generated based on four different precoding vectors. Therefore, the terminal device still performs channel estimation separately based on the precoded reference channel received on each subband.

It should also be understood that FIG. 4 is only an example, showing an example that the precoding reference signal transmitted on each subband corresponds to one port. In fact, the precoding reference signal transmitted on each subband may also correspond to multiple ports. For example, the precoding reference signal transmitted on subband 1 may be obtained by precoding the reference signal by precoding vector 1 and another precoding vector (eg, precoding vector 5); the precoding reference signal transmitted on subband 2 It can be obtained by precoding the reference signal by precoding vector 2 and another precoding vector (such as precoding vector 6); the precoding reference signal transmitted on subband 3 can be obtained by precoding vector 3 and another precoding A vector (such as precoding vector 7) is obtained by precoding the reference signal; the precoding reference signal transmitted on subband 4 can be obtained by precoding vector 4 and another precoding vector (such as precoding vector 8) on the reference signal. precoded. At this time, precoding vector 1 to precoding vector 4 may correspond to one port (eg, port 1 above), and precoding vector 5 to precoding vector 8 may correspond to another port (eg, denoted as port 2).

It can be seen from this that, in the embodiment of the present application, the precoding reference signal mapped to the same time-frequency resource in each RB in the resource to be measured is recorded as the precoding reference signal of the same port. That is, the precoding reference signal of the same port transmitted on the resource to be measured may be obtained by precoding the reference signal based on one or more precoding vectors. This is equivalent to expanding the definition of the port. Among the resources to be measured, one port is not limited to corresponding to one precoding vector, but may also correspond to multiple precoding vectors. In the subbands divided based on the first granularity, one port can be associated with one precoding vector. In other words, the precoding reference signal of the same port transmitted on the subband corresponding to the first granularity may correspond to one precoding vector.

It should be noted that when the number of ports is greater than 1, multiple precoding vectors acting on the same subband are different from each other. For example, the above precoding vector 1 is different from precoding vector 5, precoding vector 2 is different from precoding vector 6, precoding vector 3 is different from precoding vector 7, and precoding vector 4 is different from precoding vector 8.

However, it should be understood that this application does not limit the relationship between precoding vector 1 and precoding vector 6 to precoding vector 8, nor does it limit the relationship between precoding vector 2 and precoding vector 5, precoding vector 7 and precoding vector 8 , the relationship between precoding vector 3 and precoding vector 5, precoding vector 6 and precoding vector 8 is not limited, and the relationship between precoding vector 4 and precoding vector 5 to precoding vector 7 is not limited.

In an optional embodiment, the precoding reference signals of the same port transmitted on at least two subbands in the resource to be measured correspond to different precoding vectors. That is to say, the precoding reference signals of the same port transmitted on at least two subbands in the resource to be measured are obtained by precoding the reference signals with different precoding vectors. Taking the example shown in FIG. 4 , among the precoding vectors 1 to 4 corresponding to the subbands 1 to 4 respectively, at least two precoding vectors are different.

Further, the precoding vectors corresponding to the precoding reference signals of the same port transmitted on each subband in the resource to be measured are different from each other. Taking the example shown in FIG. 4 , in the precoding vector 1 to the precoding vector 4 corresponding to the subband 1 to the subband 4, any two precoding vectors are different from each other.

When the frequency domain occupied bandwidth of the resource to be measured is large, different precoding vectors are used to precode reference signals transmitted on different frequency domain resources, so that the network device can use different precoding vectors to precode the reference signals. This fully takes into account the frequency-selective characteristics of the channel, so that the precoding vector acting on the CSI-RS can match the channel states of different frequency bands. Especially when the system bandwidth is wide or the channel multipath delay is large, it is beneficial for the terminal equipment to feed back more accurately, so that the CSI fed back by the terminal equipment can be closer to the real channel to a greater extent. Accurate feedback is helpful for the network device to use a precoding matrix adapted to the channel state for data transmission, thereby helping to improve data transmission performance.

For example, the network device may indicate the above-mentioned first granularity through existing signaling. That is, the first indication information may be carried in the existing signaling. The network device may also indicate the first granularity through newly added signaling. That is, the first indication information may also be carried in the newly added signaling. This application does not limit the specific signaling used to carry the first indication information.

In one possible design, the first particle size is the same as the second particle size. Here, the second granularity is named for the convenience of being distinguished from the above-mentioned first granularity. The second granularity may specifically refer to the granularity of the subband on which the CSI reporting is based. The subbands divided based on the second granularity may be referred to as subbands corresponding to the second granularity.

In the NR protocol, the network device may indicate the second granularity through the CSI reporting configuration. Specifically, the CSI reporting configuration includes a subband size (subband size) field, and the granularity specifically indicated by the subband size field is the above-mentioned second granularity. If the first granularity and the second granularity are defined as the same granularity, the granularity corresponding to the precoding vector and the granularity on which the CSI reporting is based may be the same frequency domain granularity. In this case, the network device may multiplex the subband granularity field to indicate both the first granularity and the second granularity. That is, optionally, the first indication information is carried in the subband granularity field of the CSI reporting configuration. That is, the network device may reuse the existing field in the existing signaling to indicate the first granularity.

Looking at FIG. 5 again, when the first granularity is the same as the second granularity, any one of the subbands from subband 1 to subband 4 may be a subband corresponding to the first granularity or a subband corresponding to the second granularity. Subband. That is, the terminal device may perform channel estimation based on each of subbands 1 to 4, and may report CSI based on each of subbands 1 to 4, respectively. Defining the first granularity and the second granularity as the same granularity can reduce the signaling overhead caused by indicating the first granularity. At the same time, the granularity of the precoding vector performed by the terminal device and the granularity of the CSI feedback can also be unified, which is convenient for the terminal. Handling of equipment.

In another possible design, the first particle size is different from the second particle size.

When the first granularity is different from the second granularity, the network device may also indicate the first granularity in the CSI reporting configuration. That is, optionally, the first indication information is carried in the CSI reporting configuration. The network device indicates the first granularity by, for example, adding a new field to the CSI reporting configuration. Specifically, the CSI reporting configuration may include a first granularity field and a second granularity field. The first granularity field may be used to indicate the first granularity, and the second granularity field may be used to indicate the second granularity. Optionally, the second granularity field may be a subband granularity field in the CSI reporting configuration in the current protocol.

When the first granularity is different from the second granularity, the network device may also indicate the first granularity in the CSI-RS resource mapping. That is, optionally, the first indication information is carried in the CSI-RS resource mapping.

In one implementation, the network device may add a subband granularity field to the CSI-RS resource mapping to indicate the first granularity. For example, the subband granularity field can be expressed as:

Subband granularity enum {value 1, value 2} (subbandSize ENUMERATED{value 1, value 2}).

Among them, value 1 and value 2 can be understood as two optional values of the first granularity. The network device may indicate through the signaling which value of the two optional values the first granularity is specifically. The value 1 and value 2 may be, for example, 0 and 1, respectively, corresponding to two optional values respectively. For example, if 0 is carried in the signaling, it means that the first value of the two optional values is adopted; if 1 is carried in the signaling, it means that the second of the two optional values is adopted. value.

As an embodiment, the first granularity may have a corresponding relationship with a bandwidth part (BWP). The protocol may predefine the correspondence between a bandwidth part (bandwidth part, BWP) and the first granularity. The BWP may be specifically represented by the number of physical resource blocks (physical resource blocks, PRBs) included in the BWP, and the first granularity may be specifically represented by the number of PRBs included in the subband corresponding to the first granularity. The following table shows an example of the correspondence between BWP and the first granularity:

Therefore, the network device can also indirectly indicate the two optional values of the first granularity through the BWP. When the terminal device determines the BWP, it can also determine two optional values of the first granularity according to the predefined correspondence. The terminal device may further determine the first granularity according to the value indicated in the CSI-RS resource mapping.

It should be understood that the above is just an example, showing an example in which the first granularity corresponds to the BWP. However, this should not constitute any limitation to this application. This application does not limit the number of PRBs included in the first granularity corresponding to the BWP that includes different PRBs. The first granularity is not limited to corresponding to the BWP, but may also correspond to other parameters, which are not listed here for brevity.

Optionally, the first particle size is greater than or equal to the second particle size.

FIG. 6 shows an example of the first particle size and the second particle size. As shown in FIG. 6 , sub-band 1 to sub-band 4 are sub-bands divided based on the first granularity. Subbands I to VIII are subbands divided based on the second granularity. It can be seen that each subband corresponding to the first granularity may include two subbands corresponding to the second granularity. The same CSI-RS port in subband 1 to subband 4 corresponds to different precoding vectors respectively. The terminal device may perform channel measurement based on the precoding reference signal received on subband 1, and obtain CSI measurement results corresponding to subband I and subband II, respectively. Thereafter, the terminal device can feed back the CSI corresponding to the subband I to the network device; at the same time, the terminal device can also feed back the CSI corresponding to the subband II to the network device. By analogy, for the sake of brevity, they will not be listed here.

In step 420, the terminal device receives the first indication information. Correspondingly, in step 420, the network device sends the first indication information. The first indication information is used to indicate the first granularity.

For example, the network device may carry the first indication information through high-layer signaling, so as to indicate the first granularity to the terminal device. The specific signaling for carrying the first indication information is enumerated in step 410 above, which is not repeated here for brevity.

Optionally, the method further includes: Step 430, the network device sends a precoding reference signal on the resource to be transmitted. Correspondingly, the terminal device receives the precoding reference signal on the resource to be transmitted. The precoding reference signal transmitted on the resource to be transmitted may be obtained by precoding the reference signal by one or more precoding vectors.

The network device may precode the reference signal of the same port based on the first granularity. As mentioned above, in the subbands corresponding to the first granularity, the precoding reference signals on the same subband are generated based on the same precoding vector; the precoding reference signals on different subbands may be based on the same or different precoding vectors generate. The network device can independently select a precoding vector for precoding the reference signal on each subband according to the frequency selection characteristic of the channel. Therefore, although the precoding reference signal transmitted on the resource to be transmitted is the precoding reference signal of the same port, it may correspond to one or more precoding vectors.

The terminal device may receive the precoding reference signal on the resource to be transmitted, and in step 440, perform channel measurement according to the precoding reference signal received on the resource to be measured.

Specifically, the terminal device may estimate the channel matrix according to the precoding reference signal received on the resource to be measured, and then determine the CSI according to the estimated channel matrix. The CSI may include, for example, one or more of the following: RI, CQI, PMI, CRI, LI, and the like.

The following describes in detail the difference in the processing manner of the terminal device in the two cases where the first granularity is not configured and when the first granularity is configured.

If the network device is not configured with the first granularity, for example, reference may be made to FIG. 2 for the correspondence between ports, precoding vectors and subbands. Take the correspondence between CSI-RS resource 1, port 1, precoding vector 1 and subband 1 and subband 2 shown in FIG. 2 as an example. The terminal device may perform channel measurement based on the reference CSI-RS received on each CSI-RS pilot RE on the time-frequency resource corresponding to CSI-RS port 1. Then, channel measurement results can be obtained based on subband 1 and subband 2, respectively. In addition, in order to improve the measurement accuracy, the measurement results obtained based on the subband 1 and the subband 2 may be jointly filtered to obtain the channel measurement result after filtering. It can be understood that the channel measured by the terminal device based on the precoding reference signal is an equivalent channel, that is, the channel on which the precoding operation has been performed. Thereafter, the terminal device may perform CSI feedback based on the channel measurement result obtained after the filtering process. For the convenience of distinction and description, the manner in which the terminal device performs joint channel measurement on the time-frequency resource corresponding to one CSI-RS port is denoted as the channel measurement manner of joint processing. It can be understood that filtering the measurement results of multiple subbands utilizes the correlation of the channels in the frequency domain. However, if the channel frequency selection characteristics are obvious and the frequency domain correlation is not good, the CSI obtained by filtering the measurement results of multiple subbands may not be very accurate.

If the network device is configured with the first granularity, for example, reference may be made to FIG. 6 for the correspondence between ports, precoding vectors and subbands. Take the correspondence between CSI-RS resource 1, port 1, precoding vectors 1 to 4, subbands 1 to 4, and subband 1 to subband VIII shown in FIG. 6 as an example. The terminal device may perform channel measurement based on the precoding reference signals received on subband 1, subband 2, subband 3, and subband 4, respectively, to obtain channel measurement results corresponding to each subband. Therefore, the network device can configure different precoding vectors for reference signals transmitted on different subbands according to the frequency selection characteristics of the channel, so as to obtain more accurate feedback from the terminal device. Thereafter, the terminal device may perform CSI feedback based on the channel measurement result obtained by measuring each subband in subband 1 to subband 4 with the second granularity as the granularity. That is, the channel measurement results are fed back based on subband I to subband VIII. In order to be easily distinguished from the above-mentioned joint processing, the method in which the terminal device estimates the channel based on the first granularity and performs the channel measurement is referred to as the channel measurement method of independent processing. It can be understood that in the case of obvious channel frequency selection characteristics, if a separate precoding vector is used for precoding for each subband to perform channel measurement of each subband, compared with the channel measurement method of joint processing. In other words, the obtained CSI feedback is more accurate.

It should be understood that joint processing and independent processing are only two different processing manners when the terminal equipment performs channel measurement. This application is only named to distinguish these two different processing methods, and the naming should not constitute any limitation to the present application.

As mentioned above, the network device may reuse the existing signaling, and the existing field indicates the first granularity. If the network device does not additionally notify the terminal device that the resource to be measured has been configured with the first granularity. The terminal device may still only perform CSI measurement and feedback based on the second granularity. Therefore, the network device may notify the terminal device that the resource to be measured has been configured with the first granularity.

Optionally, the method further includes: Step 450, the terminal device receives second indication information, where the second indication information is used to instruct the network device to configure the first granularity for the resource to be measured. Correspondingly, in step 450, the network device sends the second indication information, where the second indication information is used to indicate that the resource to be measured is configured with the first granularity.

The network device may notify the terminal device whether the first granularity is configured through signaling. The terminal device may determine a specific processing manner in the channel estimation and measurement process according to whether the first granularity is configured. It can be understood that, if the network device configures the first granularity for the resource to be measured, the terminal device can determine that the precoding reference signal on the resource to be measured can be obtained by precoding the reference signal based on one or more precoding vectors. If the network device does not configure the first granularity for the resource to be measured, the terminal device can determine that the precoding reference signal transmitted on the resource to be measured is based on a precoding vector pair The reference signal is obtained by precoding, and the terminal device can perform channel measurement in a joint processing manner.

In a possible design, the second indication information is carried in the CSI reporting configuration. The second indication information may be specifically carried in a frequency domain restriction (freqRestrictionForChannelMeasurements) parameter used for channel measurement in the CSI reporting configuration. For example, the parameter can be specifically:

enumeration of frequency domain limits for channel measurements {configured, unconfigured}

(freqRestrictionForChannelMeasurements ENUMERATED{configured,notConfigured}).

For example, the network device may indicate the frequency domain restriction parameter used for channel measurement in the CSI reporting configuration through a one-bit indication field. For example, when the indication field is 0, it means that it is not configured; when the indication field is 1, it means that it has been configured. It should be understood that the indication field exemplified here is only a possible implementation manner for indicating the frequency domain restriction parameter used for channel measurement, and the information indicated by different values in the indication field is also only an example, and therefore neither No limitation of this application shall be constituted.

It should also be understood that carrying the second indication information through the CSI reporting configuration is only a possible implementation manner, and should not constitute any limitation to this application. The present application does not limit the specific signaling and the specific indication manner for carrying the second indication information.

Thus, the terminal device can perform channel estimation based on the first granularity, and when performing channel measurement, independently process the channel matrices of each subband corresponding to the first granularity, and perform channel measurement based on the second granularity.

In step 460, the terminal device transmits CSI according to the result of the channel measurement. Correspondingly, in step 460, the network device receives the CSI, where the CSI is obtained by performing channel measurement according to the precoding reference signal sent on the resource to be measured.

As mentioned above, when the terminal device feeds back the CSI, the feedback may be based on the second granularity. For each subband corresponding to the second granularity, one or more of the following are respectively fed back: RI, CQI, PMI, CRI, and LI, etc. After the terminal device feeds back the CSI based on the subband corresponding to the second granularity, the network device can determine the number of transmission layers, modulation and coding scheme (MCS), precoding matrix, etc. used to transmit data through the subband Wait.

It should be noted that the second granularity is the granularity of the subband on which the terminal device reports the CSI. However, it does not mean that the terminal device needs to report CSI based on each subband corresponding to the second granularity in the multiple RBs corresponding to the resource to be transmitted. For example, subbands I to VIII corresponding to the second granularity are shown in FIG. 6 . However, it does not mean that the terminal device needs to report CSI based on each of the subbands I to VIII. The terminal device may, for example, determine the subband to which the CSI needs to be reported according to an indication of the network device, such as the CSI reporting bandwidth (csi-ReportingBand) in the CSI reporting configuration. The subbands for which CSI needs to be reported may be part or all of the subbands corresponding to the second granularity in the above-mentioned RB corresponding to the resource to be measured.

Therefore, by configuring the first granularity for the resource to be measured in the embodiment of the present application, the network device can use different precoding vectors for precoding for reference signals configured on different frequency domain resources for the same CSI-RS resource, so as to adapt to the channel frequency selection characteristics. When performing channel measurement, the terminal device may also perform processing based on the first granularity and the second granularity. Therefore, it is beneficial to obtain accurate feedback on the channel state when the channel frequency selection characteristic is obvious. Therefore, it is beneficial to improve the data transmission performance of the system.

The channel measurement method provided by the embodiments of the present application is described in detail above with reference to FIG. 4 to FIG. 6 . It should be understood that the above-mentioned second indication information and the first indication information do not necessarily need to be used together. The network device may individually send the second indication information to the terminal device, so that the terminal device can determine the channel measurement method.

FIG. 7 is a schematic flowchart of a channel measurement method 700 provided by another embodiment of the present application. As shown in FIG. 7 , the method 700 may include steps 710 to 740 .

In step 710, the network device generates second indication information, where the second indication information is used to indicate whether the resource to be measured is configured with the first granularity.

The relevant content about the resource to be measured, the first granularity, and the second indication information has been described in detail in the method 400 above, and for brevity, it will not be repeated here.

In step 720, the network device sends the second indication information. Correspondingly, in step 720, the terminal device receives the second indication information.

For example, the network device may send the second indication information through high-layer signaling. The CSI reporting configuration, etc., as listed in the method 400 above. This application does not limit the specific signaling carrying the second indication information.

Since step 450 in the above method 400 describes in detail the specific process of sending the second indication information by the network device, for the sake of brevity, the specific description of step 710 and step 720 is omitted here.

In step 730, the terminal device performs channel measurement based on the received precoding reference signal.

Specifically, if the second indication information indicates that the resource to be measured is configured with the first granularity, the terminal device may perform channel measurement based on each subband corresponding to the first granularity according to the received precoding reference signal, and measure the subbands corresponding to the first granularity. Band measurements are processed independently to determine CSI.

If the second indication information indicates that the resource to be measured is not configured with the first granularity, the terminal device may perform joint processing on the measurement result of the reference signal according to the received precoding reference signal to determine the CSI.

Since step 440 in the above method 400 describes the specific process of performing channel measurement by the terminal device in detail, for the sake of brevity, the specific description of step 730 is omitted here.

In step 740, the terminal device transmits CSI based on the result of the channel measurement. Accordingly, the network device receives CSI, which is determined based on the results of the channel measurements.

Since step 460 in the above method 400 describes the specific process of sending CSI by the terminal device in detail, for the sake of brevity, the specific description of step 740 is omitted here.

Based on the above technical solutions, the terminal device can determine whether the network device is configured with the first granularity for the resource to be transmitted based on the second indication information, that is, the terminal device can determine, based on the second indication information, how to perform channel measurement, for example, using Joint processing or independent processing. When the frequency domain resources occupy a large bandwidth and the frequency selection feature is obvious, the network device can use different precoding vectors to precode the reference signal of the same port, and the terminal device can use independent processing to perform channel measurement. In order to obtain the feedback of the channel state that better matches the channel frequency selection characteristics; when the frequency domain resources occupy a small bandwidth and the frequency domain correlation is good, the network device can use the same precoding vector to precode the reference signal of the same port. When , the terminal equipment can also perform channel measurement by means of joint processing to improve the measurement accuracy. Therefore, it can adapt to frequency domain resources of different bandwidths to meet different needs, and the handover is very flexible. At the same time, more accurate feedback of channel state information can also be obtained, which is beneficial to improve data transmission performance.

It should be understood that, in the above-mentioned embodiments, the size of the sequence numbers of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. .

In the above, the channel measurement method provided by the embodiment of the present application is described in detail with reference to FIG. 4 to FIG. 7 . Hereinafter, the communication apparatus provided by the embodiments of the present application will be described in detail with reference to FIG. 8 to FIG. 10 .

FIG. 8 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application. As shown in the figure, the communication apparatus 1000 may include a transceiver unit 1100 and a processing unit 1200 .

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

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 400 or the method 700 according to the embodiment of the present application, and the communication apparatus 1000 may include a terminal device for executing the method 400 in FIG. 4 or the method 700 in FIG. 7 . The unit of the method to execute. Moreover, each unit in the communication apparatus 1000 and the above-mentioned other operations and/or functions are respectively to implement the corresponding flow of the method 400 in FIG. 4 or the method 700 in FIG. 7 .

Wherein, when the communication device 1000 is used to execute the method 400 in FIG. 4 , the transceiver unit 1100 can be used to execute steps 420 and 430 and steps 450 and 460 in the method 400 , and the processing unit 1200 can be used to execute the steps of the method 400 . Step 440. It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

When the communication device 1000 is used to perform the method 700 in FIG. 7 , the transceiver unit 1100 can be used to perform steps 720 and 740 in the method 700 , and the processing unit 1200 can be used to perform the step 730 in the method 700 . It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

It should also be understood that when the communication device 1000 is a terminal device, the transceiver unit 1100 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 9 , and the processing unit 1200 in the communication device 1000 may Corresponds to the processor 2010 in the terminal device 2000 shown in FIG. 9 .

It should also be understood that when the communication apparatus 1000 is a chip configured in a terminal device, the transceiver unit 1100 in the communication apparatus 1000 may be an input/output interface.

In another possible design, the communication apparatus 1000 may correspond to the network device in the above method embodiments, for example, may be a network device or a chip configured in the network device.

Specifically, the communication apparatus 1000 may correspond to the network device in the method 400 or the method 700 according to the embodiment of the present application, and the communication apparatus 1000 may include a network device for executing the method 400 in FIG. 4 or the method 700 in FIG. 7 . The unit of the method to execute. In addition, each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively to implement the corresponding flow of the method 400 in FIG. 4 or the method 700 in FIG. 7 .

Wherein, when the communication device 1000 is used to execute the method 400 in FIG. 4 , the transceiver unit 1100 can be used to execute steps 420 and 430 and steps 450 and 460 in the method 400 , and the processing unit 1200 can be used to execute the steps of the method 400 . Step 410. It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

When the communication device 1000 is used to perform the method 700 in FIG. 7 , the transceiver unit 1100 can be used to perform steps 720 and 740 in the method 700 , and the processing unit 1200 can be used to perform the step 710 in the method 700 . It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments, and for the sake of brevity, it will not be repeated here.

It should also be understood that when the communication device 1000 is a network device, the transceiver unit in the communication device 1000 may correspond to the transceiver 3200 in the network device 3000 shown in FIG. 10 , and the processing unit 1200 in the communication device 1000 may Corresponds to the processor 3100 in the network device 3000 shown in FIG. 10 .

It should also be understood that when the communication apparatus 1000 is a chip configured in a network device, the transceiver unit 1100 in the communication apparatus 1000 may be an input/output interface.

FIG. 9 is a schematic structural diagram of a terminal device 2000 provided by an embodiment of the present application. The terminal device 2000 can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiments. As shown in the figure, the terminal device 2000 includes a processor 2010 and a transceiver 2020 . Optionally, the terminal device 2000 further includes a memory 2030 . Among them, the processor 2010, the transceiver 2002 and the memory 2030 can communicate with each other through an internal connection path to transmit control and/or data signals. The computer program is called and executed to control the transceiver 2020 to send and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for receiving wireless signals, to output downlink data or downlink signaling carried in the wireless signals to the transceiver 2020, and also for transmitting the uplink data or the downlink signaling output by the transceiver 2020. Uplink control signaling is sent out through wireless signals.

The above-mentioned processor 2010 and the memory 2030 can be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to realize the above-mentioned functions. During specific implementation, the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010 . The processor 2010 may correspond to the processing unit in FIG. 8 .

The foregoing transceiver 2020 may correspond to the transceiver unit in FIG. 8 , and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that the terminal device 2000 shown in FIG. 9 can implement each process involving the terminal device in the method embodiment shown in FIG. 4 or FIG. 7 . The operations and/or functions of each module in the terminal device 2000 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

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

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

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

FIG. 10 is a schematic structural diagram of a network device provided by an embodiment of the present application, which may be, for example, a schematic structural diagram of a base station. The base station 3000 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiments. As shown, the base station 3000 may include one or more radio frequency units, such as a remote radio unit (RRU) 3100 and one or more baseband units (BBUs) (also referred to as distributed units (DUs) )) 3200.

The RRU 3100 may be called a transceiver unit, which corresponds to the transceiver unit 1200 in FIG. 8 . Optionally, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102 . Optionally, the transceiver unit 3100 may include a receiving unit and a sending unit, the receiving unit may correspond to a receiver (or called a receiver, a receiving circuit), and the sending unit may correspond to a transmitter (or called a transmitter, a sending circuit). The part of the RRU 3100 is mainly used for sending and receiving radio frequency signals and converting radio frequency signals to baseband signals, for example, for sending indication information to terminal equipment. The part of the BBU 3200 is mainly used to perform baseband processing, control the base station, and so on. The RRU 3100 and the BBU 3200 may be physically set together or physically separated, that is, a distributed base station.

The BBU 3200 is the control center of the base station, and can also be called a processing unit, which can correspond to the processing unit 1100 in FIG. For example, the BBU (processing unit) may be used to control the base station to perform the operation procedure of the network device in the above method embodiments, for example, to generate the above-mentioned first indication information and second indication information, to precode the reference signal, and so on.

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

It should be understood that the base station 3000 shown in FIG. 10 can implement various processes involving network devices in the method embodiment shown in FIG. 4 or FIG. 7 . The operations and/or functions of each module in the base station 3000 are respectively to implement the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and to avoid repetition, the detailed descriptions are appropriately omitted here.

The above-mentioned BBU 3200 may be used to perform the actions implemented by the network device described in the foregoing method embodiments, and the RRU 3100 may be used to perform the actions that the network device sends to or receives from the terminal device described in the foregoing method embodiments. For details, please refer to the descriptions in the foregoing method embodiments, which will not be repeated here.

It should be understood that the base station 3000 shown in FIG. 10 is only a possible architecture of a network device, and should not constitute any limitation to the present application. The methods provided in this application may be applicable to network devices of other architectures. For example, network equipment including CUs, DUs, and Active Antenna Units (AAUs). This application does not limit the specific architecture of the network device.

An embodiment of the present application further provides a processing apparatus, including a processor and an interface, where the processor is configured to execute the method in any of the foregoing method embodiments.

It should be understood that the above-mentioned processing device may be one or more chips. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or a The central processing unit (CPU) may also be a network processor (NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller unit, MCU). ), it can also be a programmable logic device (PLD) or other integrated chips.

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

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

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

According to the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute the program shown in FIG. 4 or FIG. 7 . method in the example.

According to the method provided by the embodiments of the present application, the present application further provides a computer-readable medium, where the computer-readable medium stores program codes, and when the program codes are run on a computer, the computer is made to execute the program shown in FIG. 4 or FIG. 7 . method in the example.

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

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

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

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

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

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

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

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

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

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

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

Claims (30)

1. a channel measurement method, is characterized in that, comprises: Receive first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used to transmit data on a preconfigured resource to be measured The reference signal to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple resource blocks RB for transmission The time-frequency resources of the precoding reference signal, and the relative positions of the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs are the same in the RBs to which they belong; the to-be-measured The multiple RBs corresponding to the resource include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit correspond to the same precoding vector; Channel measurement is performed according to the precoding reference signal received on the resource to be measured, and channel state information CSI is sent based on the result of the channel measurement. 2. The method of claim 1, wherein the method further comprises: Second indication information is received, where the second indication information is used to indicate that the first granularity is configured for the resource to be measured. 3. A channel measurement method, comprising: Generate first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used to transmit data on a preconfigured resource to be measured The reference signal to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple resource blocks RB for transmission The time-frequency resources of the precoding reference signal, and the relative positions of the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the plurality of RBs are the same in the RBs to which they belong; the The multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit are obtained by precoding with the same precoding vector; Send the first indication information. 4. The method of claim 3, wherein the method further comprises: Send second indication information, where the second indication information is used to indicate that the first granularity is configured for the resource to be measured. The method according to claim 2 or 4, wherein the second indication information is carried in a frequency domain restriction parameter used for channel measurement in a CSI reporting configuration. 6 . The method according to claim 1 , wherein the precoding reference signals transmitted on at least two frequency domain units in the resource to be measured correspond to different precoding vectors. 7 . The method according to any one of claims 1 to 6, wherein the first granularity is the same as the second granularity, and the second granularity is the granularity of the frequency domain unit on which CSI reporting is based. 8. The method of claim 7, wherein the first granularity and the second granularity are indicated by the same field. 9 . The method according to claim 1 , wherein the first indication information is carried in a CSI reporting configuration. 10 . 10 . The method of claim 9 , wherein the frequency domain unit is a subband, and the first indication information is carried by a subband granularity field in the CSI reporting configuration. 11 . The method according to any one of claims 1 to 7, wherein the first indication information is carried in a channel state information reference signal CSI-RS resource mapping configuration. 12. A channel measurement method, comprising: receiving second indication information, where the second indication information is used to indicate whether the resource to be measured is configured with the first granularity; the resource to be measured includes time-frequency resources used for transmitting precoding reference signals in multiple resource blocks RB, And the time-frequency resources used to transmit the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when the resource to be measured is configured with At the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal by one or more precoding vectors, and is transmitted on a frequency domain unit corresponding to the first granularity The precoding reference signal corresponding to the same precoding vector; when the resource to be measured is not configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with a precoding vector ; Channel measurement is performed according to the precoding reference signal received on the resource to be measured, and channel state information CSI is sent based on the result of the channel measurement. 13. A channel measurement method, comprising: generating second indication information, where the second indication information is used to indicate whether the resource to be measured is configured with the first granularity; the resource to be measured includes time-frequency resources used for transmitting precoding reference signals in multiple resource blocks RB, And the time-frequency resources used to transmit the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when the resource to be measured is configured with At the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal by one or more precoding vectors, and is transmitted on a frequency domain unit corresponding to the first granularity The precoding reference signal corresponding to the same precoding vector; when the resource to be measured is not configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with a precoding vector ; Send the second indication information. The method according to any one of claims 1 to 13, wherein the precoding reference signals transmitted in the resources to be measured correspond to the same port. 15. A communication device, comprising: A transceiver unit, configured to receive first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used for pre-configuring the transmission The reference signal on the resource to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple resource blocks The time-frequency resources used for transmitting the precoding reference signal in the RB, and the relative positions of the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs are the same in the RBs to which they belong ; the multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit correspond to the same precoding vector; The processing unit is configured to perform channel measurement according to the precoding reference signal received on the resource to be measured, and send channel state information CSI based on the result of the channel measurement. 16. The apparatus according to claim 15, wherein the transceiver unit is further configured to receive second indication information, wherein the second indication information is used to indicate that the first granularity is configured for the resource to be measured . 17. A communication device, comprising: The processing unit is configured to generate first indication information, where the first indication information is used to indicate a first granularity, where the first granularity is a granularity corresponding to a precoding vector, and the precoding vector is used for pre-configuring the transmission The reference signal on the resource to be measured is precoded; the precoded reference signal transmitted on the resource to be measured is obtained by precoding the reference signal with one or more precoding vectors, and the resource to be measured includes multiple resource blocks The time-frequency resources used for transmitting the precoding reference signal in the RB, and the relative time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs in the RBs to which they belong. The positions are the same; the multiple RBs corresponding to the resource to be measured include multiple frequency domain units corresponding to the first granularity, and the precoding reference signals transmitted on the same frequency domain unit are obtained by precoding with the same precoding vector ; A transceiver unit, configured to send the first indication information. 18. The apparatus according to claim 17, wherein the transceiver unit is further configured to receive second indication information, wherein the second indication information is used to indicate that the first granularity is configured for the resource to be measured . The apparatus according to claim 16 or 18, wherein the second indication information is carried in a frequency domain restriction parameter used for channel measurement in a CSI reporting configuration. 20 . The apparatus according to claim 15 , wherein the precoding reference signals transmitted on at least two frequency domain units in the resource to be measured correspond to different precoding vectors. 21 . The apparatus according to any one of claims 15 to 20, wherein the first granularity is the same as the second granularity, and the second granularity is the granularity of the frequency domain unit on which CSI reporting is based. 22. The apparatus of claim 21, wherein the first granularity and the second granularity are indicated by the same field. 23. The apparatus according to any one of claims 15 to 22, wherein the first indication information is carried in a CSI reporting configuration. 24. The apparatus of claim 23, wherein the frequency domain unit is a subband, and the first indication information is carried by a subband granularity field in the CSI reporting configuration. 25. The apparatus according to any one of claims 15 to 24, wherein the first indication information is carried in a channel state information reference signal CSI-RS resource mapping configuration. 26. A communication device, characterized in that it comprises: a transceiver unit, configured to receive second indication information, where the second indication information is used to indicate whether a first granularity is configured for the resource to be measured; the resource to be measured includes a plurality of resource blocks RB used for transmitting precoding reference signals time-frequency resources, and the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when the When the resource to be measured is configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal by one or more precoding vectors, and the one corresponding to the first granularity is obtained. The precoding reference signal transmitted on the frequency domain unit corresponds to the same precoding vector; when the resource to be measured is not configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is referenced by a precoding vector The signal is obtained by precoding; The processing unit is configured to perform channel measurement according to the precoding reference signal received on the resource to be measured, and send channel state information CSI based on the result of the channel measurement. 27. A communication device, characterized in that it comprises: a processing unit, configured to generate second indication information, where the second indication information is used to indicate whether the resource to be measured is configured with a first granularity; the resource to be measured includes a plurality of resource blocks RB used for transmitting precoding reference signals time-frequency resources, and the time-frequency resources used for transmitting the precoding reference signal in any two RBs in the multiple RBs are the same; the first granularity is the granularity corresponding to the precoding vector; when the When the resource to be measured is configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is obtained by precoding the reference signal by one or more precoding vectors, and the one corresponding to the first granularity is obtained. The precoding reference signal transmitted on the frequency domain unit corresponds to the same precoding vector; when the resource to be measured is not configured with the first granularity, the precoding reference signal transmitted on the resource to be measured is referenced by a precoding vector The signal is obtained by precoding; A transceiver unit, configured to send the second indication information. 28. The apparatus according to any one of claims 15 to 27, wherein the precoding reference signals transmitted in the resources to be measured correspond to the same port. 29. A communications apparatus comprising at least one processor for performing the method of any of claims 1 to 14. 30. A computer-readable medium comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 14.

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