Signal transmission method, terminal device, and network device

Embodiments of this application disclose a signal transmission method, a terminal device, and a network device. The method includes: determining, by a terminal device, information indicating a channel state information-reference signal (CSI-RS) resource, the information corresponding to a target uplink signal; determining, by the terminal device, a power control parameter of the target uplink signal according to the information indicating the CSI-RS resource; determining, by the terminal device, a transmit power of the target uplink signal according to the power control parameter; and sending, by the terminal device, the target uplink signal to the network device according to the transmit power. The method, the terminal device, and the network device in the embodiments of this application help improve the accuracy of power control, so that system transmission performance can be improved.

TECHNICAL FIELD

Embodiments of this application relate to the field of communications, and more specifically, to a signal transmission method, a terminal device, and a network device.

RELATED ART

For an uplink signal, power control of a terminal is of great significance for power conservation and suppression of inter-cell interference. Therefore, how to improve the accuracy of uplink power control is an issue that is continuously researched.

SUMMARY

In view of this, embodiments of this application provide a signal transmission method, a terminal device, and a network device, thereby helping improve the accuracy of uplink power control, so that system transmission performance can be improved.

According to a first aspect, a signal transmission method is provided, the method including: determining, by a terminal device, information indicating a channel state information-reference signal (CSI-RS) resource, the information corresponding to a target uplink signal; determining, by the terminal device, a power control parameter of the target uplink signal according to the information indicating the CSI-RS resource; determining, by the terminal device, a transmit power of the target uplink signal according to the power control parameter; and sending, by the terminal device, the target uplink signal to a network device according to the transmit power.

The information indicating the CSI-RS resource may be indication information used to indicate a CSI-RS resource. The network device may preconfigure or specify in a protocol one or more CSI-RS resources. The network device may further preconfigure that different CSI-RS resources or different pieces of information indicating the CSI-RS resource correspond to a group of independent power control parameters. The group of independent power control parameters includes a value of at least one power control parameter. The power control parameter may be any one or any combination of parameters in a calculation formula of the transmit power.

A transmit power of a target uplink signal is determined by referring to a power control parameter corresponding to information indicating the CSI-RS resource sent by a network device, thereby helping improve the accuracy of uplink power control, so that system transmission performance can be improved.

In a possible implementation, the target uplink signal is a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH) or a sounding reference signal (SRS).

In a possible implementation, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook.

In a possible implementation, a CSI-RS resource indicated by the information indicating the CSI-RS resource is used to obtain a precoding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

In a possible implementation, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in downlink control information (DCI) used to schedule the target uplink signal.

In a possible implementation, the method further includes: receiving, by the terminal device, first information sent by the network device, where the first information carries the information indicating the CSI-RS resource; and the determining, by a terminal device, information indicating the CSI-RS resource corresponding to a target uplink signal includes: determining, by the terminal device, the information indicating the CSI-RS resource in the first information.

In a possible implementation, if the target uplink signal is a PUSCH, the first information is DCI used to schedule the PUSCH or downlink signaling used to configure, trigger or activate a second SRS corresponding to the PUSCH.

In a possible implementation, the second SRS is an SRS used to obtain a transmission parameter of the PUSCH, or the second SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information included in DCI used to schedule the PUSCH.

In a possible implementation, the transmission parameter includes at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and transmitting beams.

In a possible implementation, if the target uplink signal is an SRS, the first information is downlink signaling used to configure, trigger or activate the SRS.

In a possible implementation, the method further includes: receiving, by the terminal device, configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the information indicating the CSI-RS resource, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the determining, by the terminal device, a power control parameter of the target uplink signal according to the information indicating the CSI-RS resource includes: determining, by the terminal device, the power control parameter according to the information indicating the CSI-RS resource and the configuration information.

In a possible implementation, the method further includes: receiving, by the terminal device, configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one piece of information indicating the CSI-RS resource information and at least one group of power control parameters, the at least one piece of information indicating the CSI-RS resource includes the information indicating the CSI-RS resource, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the determining, by the terminal device, a power control parameter of the target uplink signal according to the information indicating the CSI-RS resource includes: determining, by the terminal device, the power control parameter according to the information indicating the CSI-RS resource and the configuration information.

In a possible implementation, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate the transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

In a possible implementation, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index of a target power Po or an index of a path loss weighting factor a.

In a possible implementation, the closed-loop power control parameter includes an index of a closed-loop power control process.

In a possible implementation, before the determining, by a terminal device, CSI-RS resource indication information corresponding to a target uplink signal, the method further includes: determining, by the terminal device, the transmit power of the target uplink signal by using a power control parameter preconfigured by the network device.

According to a second aspect, a signal transmission method is provided, the method including: sending, by a network device, information indicating the CSI-RS resource corresponding to a target uplink signal to a terminal device, where the information indicating the CSI-RS resource is used by the terminal device to determine a power control parameter of the target uplink signal; and receiving, by the network device, the target uplink signal sent by the terminal device based on the power control parameter.

In a possible implementation, the target uplink signal is a PUSCH, a PUSCH or an SRS.

In a possible implementation, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook.

In a possible implementation, a CSI-RS resource indicated by the information indicating the CSI-RS resource is used to obtain a precoding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

In a possible implementation, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in DCI used to schedule the target uplink signal.

In a possible implementation, if the target uplink signal is a PUSCH, the information indicating the CSI-RS resource is carried in DCI used to schedule the PUSCH or downlink signaling used to configure, trigger or activate a second SRS corresponding to the PUSCH.

In a possible implementation, the second SRS is an SRS used to obtain a transmission parameter of the PUSCH, or the second SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information included in DCI used to schedule the PUSCH.

In a possible implementation, the transmission parameter includes at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and transmitting beams.

In a possible implementation, if the target uplink signal is an SRS, the information indicating the CSI-RS resource is carried in downlink signaling used to configure, trigger or activate the SRS.

In a possible implementation, the method further includes: sending, by the network device, configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the information indicating the CSI-RS resource, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

In a possible implementation, the method further includes: sending, by the network device, configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one piece of information indicating the CSI-RS resource and at least one group of power control parameters, the at least one piece of information indicating the CSI-RS resource includes the information indicating the CSI-RS resource, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

In a possible implementation, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate a transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

In a possible implementation, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index of a target power Po or an index of a path loss weighting factor a.

In a possible implementation, the closed-loop power control parameter includes an index of a closed-loop power control process.

According to a third aspect, a terminal device is provided. The terminal device is configured to perform the method according to any one of the first aspect or the possible implementations of the first aspect. Specifically, the terminal device includes units configured to perform the method according to any one of the first aspect or the possible implementations of the first aspect.

According to a fourth aspect, a network device is provided. The network device is configured to perform the method according to any one of the second aspect or the possible implementations of the second aspect. Specifically, the network device includes units configured to perform the method according to any one of the second aspect or the possible implementations of the second aspect.

According to a fifth aspect, a terminal device is provided. The terminal device includes a memory, a processor, an input interface, and an output interface. The memory, the processor, the input interface, and the output interface are connected by using a bus system. The memory is configured to store an instruction, and the processor is configured to execute the instruction stored in the memory, to perform the method according to any one of the first aspect or the possible implementations of the first aspect.

According to a sixth aspect, a network device is provided. The network device includes a memory, a processor, an input interface, and an Output interface. The memory, the processor, the input interface, and the output interface are connected by using a bus system. The memory is configured to store an instruction, and the processor is configured to execute the instruction stored in the memory, to perform the method according to any one of the second aspect or the possible implementations of the second aspect.

According to a seventh aspect, a computer storage medium is provided, configured to store a computer software instruction used to perform the method according to any one of the first aspect or the possible implementations of the first aspect or the method according to any one of the second aspect or the possible implementations of the second aspect, and including a designed program used to perform the foregoing aspects.

According to an eighth aspect, a computer program product including an instruction is provided, and when the computer program product is executed on a computer, the computer is enabled to perform the method according to any one of the first aspect or the optional implementations of the first aspect or the method according to any one of the second aspect or the optional implementations of the second aspect.

These aspects or other aspects of this application are simpler and more comprehensible in descriptions of the following embodiments.

DETAILED DESCRIPTION

The technical solutions according to embodiments of this application are described below clearly with reference to the accompanying drawings in the embodiments of this application.

It should be understood that, the technical solutions according to the embodiments of this application may be applied to a variety of communications systems, such as a Global System for Mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS) system, a Long Term Evolution (LIE) system, an LTE Frequency Division Duplex (FDD) system, an LIE Time Division Duplex (TDD) system, a Universal Mobile Telecommunication System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communications system, a new radio (NR) system, a future 5G system or the like.

Particularly, the technical solutions of the embodiments of this application may be applied to various communications systems based on a Non-Orthogonal Multiple Access technology, for example, a Sparse Code Multiple Access (SCMA) system, and a Low Density Signature (LDS) system. Certainly, the SCMA system and the LDS system may also be referred to as other names in the communications field. Further, the technical solutions of the embodiments of this application may be applied to multi-carrier transmission systems in which the Non-Orthogonal Multiple Access technology is used, for example, an Orthogonal Frequency Division Multiplexing (OFDM) system, a Filter Bank Multi-Carrier (FBMC) system, a Generalized Frequency Division Multiplexing (GFDM) system, and a filtered-Orthogonal Frequency Division Multiplexing (F-OFDM) system in which the Non-Orthogonal Multiple Access technology is used.

A terminal device in the embodiments of this application may be user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communications device, a user agent or a user apparatus. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having a wireless communication function, a computing device, another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network, a terminal device in a future evolved public land mobile network (PLMN) or the like. This is not limited in the embodiments of this application.

A network device in the embodiments of this application may be a device configured to communicate with the terminal device. The network device may be a base transceiver station (BTS) in a GSM or a CDMA system, or may be a NodeB (NB) in a WCDMA system, or may be an evolved NodeB (eNB or eNodeB) in an LTE system, or may be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, a network device in a future evolved PLMN network or the like. This is not limited in the embodiments of this application.

FIG. 1is a schematic diagram of an application scenario according to an embodiment of this application. A communications system inFIG. 1may include a terminal device10and a network device20. The network device20is configured to provide a communications service to the terminal device10and access a core network, and the terminal device10accesses the network by searching for a synchronization signal, a broadcast signal, and the like sent by the network device20, thereby communicating with the network. An arrow shown inFIG. 1may indicate uplink/downlink transmission performed over a cellular link between the terminal device10and the network device20.

For an uplink signal, power control of a terminal device is of great significance for power conservation and suppression of inter-cell interference. Therefore, the uplink power control is a focus in LTE. The uplink power control in a cell includes control of powers of a PUSCH, a PUCCH, and an SRS.

Two uplink transmission manners, namely, a codebook-based transmission manner and a non-codebook-based transmission manner, are introduced in NR. For the codebook-based transmission manner, an uplink beam used in transmission is notified to a terminal device by using beam indication information in scheduling information. When using different transmitting beams, the terminal device needs to use different power control parameters. The beam indication information is associated with an uplink power control parameter. The corresponding power control parameter may be determined by using the beam indication information. The association relationship is notified to the terminal device in advance by using radio resource control (RRC) signaling.

For the non-codebook-based uplink transmission, a network side may configure a corresponding CSI-RS resource for an uplink SRS or PUSCH. The terminal device obtains downlink channel information based on the CSI-RS resource, then obtains uplink channel information based on the downlink channel information and channel reciprocity, and calculates a precoding matrix of the uplink SRS or PUSCH according to the uplink channel information. An uplink beam used in transmission may be correspondingly obtained by the terminal device by using uplink and downlink beams. That is, the terminal device may obtain a beam of transmitting of an uplink signal by using a receive beam of a downlink signal, and does not require a beam indication on the network side. In this case, how the terminal device determines corresponding power control parameters for different transmitting beams is an issue.

FIG. 2is a schematic block diagram of a signal transmission method100according to an embodiment of this application. As shown inFIG. 2, the method100includes some or all of the following content:

S110: A terminal device determines CSI-RS resource indication information corresponding to a target uplink signal.

S120: The terminal device determines a power control parameter of the target uplink signal according to the CSI-RS resource indication information.

S130: The terminal device determines a transmit power of the target uplink signal according to the power control parameter.

S140: The terminal device sends the target uplink signal to a network device according to the transmit power.

Specifically, the network device may preconfigure or specify in a protocol one or more CSI-RS resources. Different beams may be used for CSI-RSs sent on different CSI-RS resources, and the network device may preconfigure or specify in a protocol a correspondence between one or more CSI-RS resources and a power control parameter or a correspondence between one or more pieces of CSI-RS resource indication information and a power control parameter. That is, each CSI-RS resource or each piece of CSI-RS resource indication information may correspond to a group of independent power control parameters. The network device may indicate, to the terminal device, a power control parameter corresponding to a CSI-RS resource or CSI-RS resource indication information to transmit the target uplink signal. The terminal device may make a particular adjustment based on the power control parameter indicated by the network device to determine the power control parameter of the target uplink signal or may directly determine the power control parameter indicated by the network device as the power control parameter of the target uplink signal. The terminal device may further determine the transmit power of the target uplink signal according to the determined power control parameter, to send the target uplink signal to the network device according to the determined transmit power.

Therefore, in the signal transmission method in this embodiment of this application, a transmit power of a target uplink signal is determined by referring to a power control parameter corresponding to CSI-RS resource indication information sent by a network device, thereby helping improve the accuracy of uplink power control, so that system transmission performance can be improved.

The target uplink signal may be a PUSCH, a PUCCH, an SRS or the like. The type of the target uplink signal is not limited in this embodiment of this application. The technical solution in this embodiment of this application may be used to determine a transmit power for any uplink signal.

Further, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook. That is, the PUSCH is transmitted in a non-codebook transmission manner. For example, after receiving CSI-RS resource indication information, the terminal device may obtain downlink channel information according to a CSI-RS resource indicated by the CSI-RS resource indication information, then obtain uplink channel information based on the downlink channel information and channel reciprocity, and calculate precoded information of the PUSCH according to the uplink channel information. The terminal device may obtain a beam of transmitting of the PUSCH by using beam correspondence. That is, a receive beam for receiving a CSI-RS by the terminal device may be used to obtain a beam of transmitting for sending a PUSCH. The SRS may be transmitted in a non-codebook-based transmission manner. The target uplink signal may further be an SRS used to obtain a transmission parameter of the PUSCH.

Optionally, in this embodiment of this application, a CSI-RS resource indicated by the CSI-RS resource indication information is used to obtain a precoding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

How to use a CSI-RS resource indicated by CSI-RS resource indication information to obtain a precoding matrix or a beam of transmitting of a PUSCH has been described above. The method is also applicable to any uplink signal, for example, the PUCCH or SRS.

Further, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in DCI used to schedule the target uplink signal.

Optionally, in this embodiment of this application, transmission parameters of the various uplink signals may all be obtained by using the first SRS. The transmission parameter may include at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and a beam of transmitting. That is, after receiving CSI-RS resource indication information, the terminal device may determine a precoding matrix or a beam of transmitting of the first SRS according to a CSI-RS resource indicated by the CSI-RS resource indication information and channel reciprocity. After the terminal device sends the first SRS based on the precoding matrix or a beam of transmitting. A network side may determine the transmission parameter of the target uplink signal according to the first SRS, and indicate the determined transmission parameter to the terminal device, or schedule the terminal device according to the determined transmission parameter. The first SRS is used to obtain the transmission parameter of the target uplink signal. This may be implemented by making a quantity of antenna ports of the first SRS equal to a quantity of transmission ports of the target uplink signal.

In addition, the target uplink signal is associated with the SRS, or the DCI used to schedule the target uplink signal may carry the SRS resource indication information for indicating the SRS resource. Generally, the SRS resource indication information carried in the DCI is used to indicate the SRS resource associated with the target uplink signal. The SRS transmitted on the resource is the first SRS.

In this embodiment of this application, the “corresponding” in “the CSI-RS resource indication information corresponding to the target uplink signal” may indicate that the network device and the terminal device specify in advance or the network device configures that an indication manner belongs to a specific uplink signal. For example, it may be specified that a specific field in DCI used to schedule a PUSCH is the CSI-RS resource indication information corresponding to the PUSCH.

In addition, a person skilled in the art understands that the CSI-RS resource indication information may be indication information used to indicate a CSI-RS resource. For example, the network device and the terminal device specify in advance four CSI-RS resources, and specify in advance that two bits are used to indicate the four CSI-RS resources. Specifically, Indication information corresponding to a CSI-RS resource1is 00, indication information corresponding to a CSI-RS resource2is 01, indication information corresponding to a. CSI-RS resource3is 10, and indication information corresponding to a. CSI-RS resource4is 11.

It should be understood that, the power control parameter in this embodiment of this application may be any one or any combination of parameters in a calculation formula of the transmit power. For example, the calculation formula of the transmit power generally includes a maximum allowable transmit power of the terminal device, a power offset, a transmit bandwidth of an uplink signal on a subframe, a target receive power, a path loss compensation factor, a closed-loop power adjustment amount, a path loss, and the like. That is, in this embodiment of this application, a group of power control parameters corresponding to each CSI-RS resource or each piece of CSI-RS resource indication information includes a value of at least one of parameter.

An example in which the target uplink signal is a PUSCH and an example in which the target uplink signal is an SRS are separately used to describe below in detail a manner of carrying a CSI-RS in this embodiment of this application.

Optionally, in this embodiment of this application, the method further includes: receiving, by the terminal device, first information sent by the network device, where the first information carries the CSI-RS resource indication information; and the determining, by a terminal device, CSI-RS resource indication information corresponding to a target uplink signal includes: determining, by the terminal device, the CSI-RS resource indication information in the first information.

It should be understood that, the first information may be, for example, high layer signaling such as RRC signaling and media access control (MAC) signaling, DCI signaling, and system information.

If the target uplink signal is a PUSCH, the CSI-RS resource indication information is the CSI-RS resource indication information configured by the network device for the PUSCH, the CSI-RS resource indication information may be carried in DCI for scheduling the PUSCH.

If the target uplink signal is a PUSCH and the CSI-RS resource indication information is the CSI-RS resource indication information configured by the network device for the SRS corresponding to the PUSCH, the CSI-RS resource indication information may be carried in downlink signaling used by the network device to configure, trigger or activate transmission of the SRS. Specifically, if the SRS is a periodic SRS, RRC signaling used to configure transmission of the SRS may carry the CSI-RS resource indication information. If the SRS is a non-periodic SRS, DCI used to trigger transmission of the SRS may carry the CSI-RS resource indication information. In this case, the transmission resource of the DCI and the CSI-RS resource indicated by the CSI-RS resource indication information may be included in a same slot. If the SRS is a quasi-continuous SRS, MAC signaling used to activate transmission of the SRS or RRC signaling may carry the CSI-RS resource indication information.

If the target uplink signal is an SRS, the CSI-RS resource indication information may be carried in downlink signaling used by the network device to configure, trigger or activate transmission of the SRS. Specifically, if the SRS is a periodic SRS, RRC signaling used to configure transmission of the SRS may carry the CSI-RS resource indication information. If the SRS is a non-periodic SRS, DCI used to trigger transmission of the SRS may cam/the CSI-RS resource indication information. In this case, the transmission resource of the DCI and the CSI-RS resource indicated by the CSI-RS resource indication information may be included in a same slot. If the SRS is a quasi-continuous SRS, MAC signaling used to activate transmission of the SRS or RRC signaling may carry the CSI-RS resource indication information.

Optionally, in this embodiment of this application, the method further includes: receiving, by the terminal device, configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the determining, by the terminal device, a power control parameter of the target uplink signal according to the CSI-RS resource indication information includes: determining, by the terminal device, the power control parameter according to the CSI-RS resource indication information and the configuration information.

Optionally, in this embodiment of this application, the method further includes: receiving, by the terminal device, configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one piece of CSI-RS resource indication information and at least one group of power control parameters, the at least one piece of CSI-RS resource indication information includes the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the determining, by the terminal device, a power control parameter of the target uplink signal according to the CSI-RS resource indication information includes: determining, by the terminal device, the power control parameter according to the CSI-RS resource indication information and the configuration information.

Specifically, the network side preconfigures values of a group of power control parameters corresponding to each of the at least one CSI-RS resource or each piece of the at least one piece of CSI-RS resource indication information, so that the terminal device may determine values of a corresponding group of power control parameters according to the currently indicated CSI-RS resource or the current CSI-RS resource indication information. Herein, one group of power control parameters may include only one power control parameter, for example, an open-loop power control parameter or a path loss value, or may include a plurality of parameters, for example, open-loop power control parameters and path loss values.

For example, the network device and the terminal device specify in advance four CSI-RS resources, and the four CSI-RS resources respectively have independent power control parameters. In this case, the network device and the terminal device may further specify in advance that two bits are used to indicate the four CSI-RS resources. Specifically, indication information corresponding to a CSI-RS resource1is 00, indication information corresponding to a CSI-RS resource2is 01, indication information corresponding to a CSI-RS resource3is 10, and indication information corresponding to a CSI-RS resource4is 11. That is, the network device may configure that 00 corresponds to a power control parameter group1, 01 corresponds to a power control parameter group2, 10 corresponds to a power control parameter group3, and 11 corresponds to a power control parameter group4. The network device may also configure that the CSI-RS resource1corresponds to the power control parameter group1, the CSI-RS resource2corresponds to the power control parameter group2, the CSI-RS resource3corresponds to the power control parameter group3, and the CSI-RS resource4corresponds to the power control parameter group4. The power control parameter groups1to4correspond to different values of a same group of the power control parameters.

At least one of the CSI-RS resource and the CSI-RS resource indication information has a correspondence with the power control parameter. That is, after receiving the CSI-RS resource indication information, the terminal device determines, according to a value of the indication information, the power control parameter corresponding to the value. Alternatively, after receiving the CSI-RS resource indication information, the terminal device may first determine, according to the indication information, a CSI-RS resource indicated by the indication information, and further determine, according to the CSI-RS resource, the power control parameter corresponding to the CSI-RS resource. This is not limited in this application.

Optionally, in this embodiment of this application, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate the transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

The information about a downlink signal used to measure a path loss value used to calculate the transmit power may be considered as path loss reference association information. That is, the downlink signal may be a subset of downlink signals used to estimate a path loss of the target uplink signal. For example, path loss reference association information of a PUSCH may be downlink pilot signals that are in a configuration set of downlink pilot signals and are used to measure a path loss, so as to estimate a path loss of the PUSCH. The downlink signal may be a downlink synchronous signal block (SSB), a CSI-RS, a physical broadcast channel (PBCH) or a demodulation reference signal (DMRS). For example, the terminal device measures a downlink path loss based on the CSI-RS resource indicated by the CSI-RS resource indication information, so as to obtain the path loss value. For another example, the terminal device determines an index k of a corresponding downlink signal according to the CSI-RS resource indication information, and measures a downlink path loss based on a downlink signal indicated by the index k, so as to obtain the path loss value. Herein, a correspondence between CSI-RS resource indication information and an index k of a downlink signal is preconfigured by the network side by using high layer signaling.

Optionally, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index j of the target power Po or an index p of the path loss weighting factor a. An index j indicates one target power from values of a plurality of target powers preconfigured by using high layer signaling, and an index p indicates one path loss weighting factor from values of a path plurality of loss weighting factors preconfigured by using high layer signaling. Herein, a correspondence among the value of the target power Po, the value of the path loss weighting factor a, the index j of the target power Po, and the index p of the path loss weighting factor and the CSI-RS resource indication information may be preconfigured by using high layer signaling.

Optionally, the closed-loop power control parameter includes an index1of a closed-loop power control process. The index1indicates one power control process in at least one predefined power control process. A correspondence between an index1and CSI-RS resource indication information may be preconfigured by using high layer signaling.

Optionally, in this embodiment of this application, before the determining, by a terminal device, CSI-RS resource indication information corresponding to a target uplink signal, the method further includes: determining, by the terminal device, the transmit power of the target uplink signal by using a power control parameter preconfigured by the network device.

Specifically, if the terminal device does not receive CSI-RS resource indication information sent by the network side, the power control parameter preconfigured by the network side for the target uplink signal is used until the CSI-RS resource indication information is received. Specifically, after the CSI-RS resource indication information is received, a power control parameter corresponding to the CSI-RS resource indication information is used to replace a value preconfigured by the network side.

FIG. 3is a schematic block diagram of a signal transmission method200according to an embodiment of this application. As shown inFIG. 3, the method200includes some or all of the following content:

S210: A network device sends CSI-RS resource indication information corresponding to a target uplink signal to a terminal device, where the CSI-RS resource indication information is used by the terminal device to determine a power control parameter of the target uplink signal.

S220: The network device receives the target uplink signal sent by the terminal device based on the power control parameter.

Therefore, in the signal transmission method in this embodiment of this application, a transmit power of a target uplink signal is determined by referring to a power control parameter corresponding to CSI-RS resource indication information sent by a network device, thereby helping improve the accuracy of uplink power control, so that system transmission performance can be improved.

Optionally, in this embodiment of this application, the target uplink signal is a PUSCH, a PUCCH or an SRS

Optionally, in this embodiment of this application, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook.

Optionally, in this embodiment of this application, a CSI-RS resource indicated by the CSI-RS resource indication information is used to obtain a precoding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

Optionally, in this embodiment of this application, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in DCI used to schedule the target uplink signal.

Optionally, in this embodiment of this application, if the target uplink signal is a PUSCH, the CSI-RS resource indication information is carried in DCI used to schedule the PUSCH or downlink signaling used to configure, trigger or activate a second SRS corresponding to the PUSCH.

Optionally, in this embodiment of this application, the second SRS is an SRS used to obtain a transmission parameter of the PUSCH, or the second. SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information included in DCI used to schedule the PUSCH.

Optionally, in this embodiment of this application, the transmission parameter includes at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and transmitting beams.

Optionally, in this embodiment of this application, if the target uplink signal is an SRS, the CSI-RS resource indication information is carried in downlink signaling used to configure, trigger or activate the SRS.

Optionally, in this embodiment of this application, the method further includes: sending, by the network device, configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

Optionally, in this embodiment of this application, the method further includes: sending, by the network device, configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one piece of CSI-RS resource indication information and at least one group of power control parameters, the at least one piece of CSI-RS resource indication information includes the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

Optionally, in this embodiment of this application, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate the transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

Optionally, in this embodiment of this application, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index of a target power Po or an index of a path loss weighting factor a.

Optionally, in this embodiment of this application, the closed-loop power control parameter includes an index of a closed-loop power control process.

It should be understood that, the terms “system” and “network” in this specification are usually interchangeably used in this specification. The term “and/or” in this specification is only an association relationship for describing the associated objects, and represents that three relationships may exist, for example, A and/or B may represent the following three cases: A exists separately, both A and B exist, and B exists separately. In addition, the character “/” in this specification generally indicates an “or” relationship between the associated objects.

It should be understood that, interaction between the network device and the terminal device and related characteristics, functions, and the like described for the network device correspond to related characteristics and functions of the terminal device. Moreover, related content has been described in detail in the foregoing method100. For brevity, details are not described herein again.

The signal transmission method according to the embodiments of this application is described above in detail. The signal transmission apparatuses according to the embodiments of this application are described below with reference toFIG. 4toFIG. 7. Technical features described in the method embodiments are applicable to the following apparatus embodiments.

FIG. 4is a schematic block diagram of a terminal device300according to an embodiment of this application. As shown inFIG. 4, the terminal device300includes:

a first determining unit310, configured to determine CSI-RS resource indication information corresponding to a target uplink signal;

a second determining unit320, configured to determine a power control parameter of the target uplink signal according to the CSI-RS resource indication information;

a third determining unit330, configured to determine a transmit power of the target uplink signal according to the power control parameter; and

a sending unit340, configured to send the target uplink signal to a network device according to the transmit power.

Therefore, the terminal device in this embodiment of this application helps improve the accuracy of power control, so that system transmission performance is improved.

Optionally, in this embodiment of this application; the target uplink signal is a PUSCH, a PUCCH or an SRS.

Optionally, in this embodiment of this application, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook.

Optionally, in this embodiment of this application, a CSI-RS resource indicated by the CSI-RS resource indication information is used to obtain a preceding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

Optionally, in this embodiment of this application, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in DCI used to schedule the target uplink signal.

Optionally, in this embodiment of this application, the terminal device further includes: a first receiving unit, configured to receive first information sent by the network device, where the first information carries the CSI-RS resource indication information; and the first determining unit is specifically configured to determine the CSI-RS resource indication information in the first information.

Optionally, in this embodiment of this application, if the target uplink signal is a PUSCH, the first information is DCI used to schedule the PUSCH or downlink signaling used to configure, trigger or activate a second SRS corresponding to the PUSCH.

Optionally, in this embodiment of this application, the second SRS is an SRS used to obtain a transmission parameter of the PUSCH, or the second SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information included in DCI used to schedule the PUSCH.

Optionally, in this embodiment of this application, the transmission parameter includes at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and transmitting beams.

Optionally, in this embodiment of this application, if the target uplink signal is an SRS, the first information is downlink signaling used to configure, trigger or activate the SRS.

Optionally, in this embodiment of this application, the terminal device further includes: a second receiving unit, configured to receive configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the second determining unit is specifically configured to determine the power control parameter according to the CSI-RS resource indication information and the configuration information.

Optionally, in this embodiment of this application, the terminal device further includes: a second receiving unit, configured to receive configuration information sent by the network device, where the configuration information is used to indicate a correspondence between at least one piece of CSI-RS resource indication information and at least one group of power control parameters, the at least one piece of CSI-RS resource indication information includes the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter; and the second determining unit is specifically configured to determine the power control parameter according to the CSI-RS resource indication information and the configuration information.

Optionally, in this embodiment of this application, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate the transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

Optionally, in this embodiment of this application, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index of a target power Po or an index of a path loss weighting factor a.

Optionally, in this embodiment of this application, the closed-loop power control parameter includes an index of a closed-loop power control process.

Optionally, in this embodiment of this application, before the determining, by a terminal device, CSI-RS resource indication information corresponding to a target uplink signal, the terminal device further includes: a fourth determining unit, configured to: before the first determining unit determines the CSI-RS resource indication information corresponding to the target uplink signal, determine the transmit power of the target uplink signal by using a power control parameter preconfigured by the network device.

It should be understood that, the terminal device300in this embodiment of this application may correspond to the terminal device in the method embodiments of this application, and the foregoing operations and/or functions and other operations and/or functions of the units in the terminal device300are respectively for implementing corresponding procedures of the terminal device in the method shown inFIG. 2. For brevity, details are not described herein again.

FIG. 5is a schematic block diagram of a network device400according to an embodiment of this application. As shown inFIG. 5, the network device400includes:

a first sending unit410, configured to send CSI-RS resource indication information corresponding to a target uplink signal to a terminal device, where the CSI-RS resource indication information is used by the terminal device to determine a power control parameter of the target uplink signal; and

a receiving unit420, configured to receive the target uplink signal sent by the terminal device based on the power control parameter.

Therefore, the network device in this embodiment of this application, thereby helping improve the accuracy of power control, so that system transmission performance is improved.

Optionally, in this embodiment of this application, the target uplink signal is a PUSCH, a PUCCH or an SRS.

Optionally, in this embodiment of this application, the target uplink signal is a PUSCH precoded based on a non-codebook or is an SRS used to obtain a transmission parameter of a PUSCH precoded based on a non-codebook.

Optionally, in this embodiment of this application, a CSI-RS resource indicated by the CSI-RS resource indication information is used to obtain a precoding matrix or a beam of transmitting of the target uplink signal or is used to obtain a precoding matrix or a beam of transmitting of a first SRS corresponding to the target uplink signal.

Optionally, in this embodiment of this application, the first SRS is an SRS used to obtain a transmission parameter of the target uplink signal, or the first SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information carried in DCI used to schedule the target uplink signal.

Optionally, in this embodiment of this application, if the target uplink signal is a PUSCH, the CSI-RS resource indication information is carried in DCI used to schedule the PUSCH or downlink signaling used to configure, trigger or activate a second SRS corresponding to the PUSCH.

Optionally, in this embodiment of this application, the second SRS is an SRS used to obtain a transmission parameter of the PUSCH, or the second. SRS is an SRS transmitted on an SRS resource indicated by SRS resource indication information included in DCI used to schedule the PUSCH.

Optionally, in this embodiment of this application, the transmission parameter includes at least one of the following information: a used frequency domain resource, layer number, precoding matrix, modulation and coding scheme, and transmitting beams.

Optionally, in this embodiment of this application, if the target uplink signal is an SRS, the CSI-RS resource indication information is carried in downlink signaling used to configure, trigger or activate the SRS.

Optionally, in this embodiment of this application, the network device further includes: a second sending unit, configured to send configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one CSI-RS resource and at least one group of power control parameters, the at least one CSI-RS resource includes the CSI-RS resource indicated by the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

Optionally, in this embodiment of this application, the network device further includes: a second sending unit, configured to send configuration information to the terminal device, where the configuration information is used to indicate a correspondence between at least one piece of CSI-RS resource indication information and at least one group of power control parameters, the at least one piece of CSI-RS resource indication information includes the CSI-RS resource indication information, and each group of power control parameters of the at least one group of power control parameters includes a value of at least one power control parameter.

Optionally, in this embodiment of this application, the power control parameter includes at least one piece of information of the following information: a path loss value used to calculate a transmit power, information about a downlink signal used to measure a path loss value used to calculate the transmit power, an open-loop power control parameter, and a closed-loop power control parameter.

Optionally, in this embodiment of this application, the open-loop power control parameter includes a value of a target power Po, a value of a path loss weighting factor a, an index of a target power Po or an index of a path loss weighting factor a.

Optionally, in this embodiment of this application, the closed-loop power control parameter includes an index of a closed-loop power control process.

It should be understood that, the network device400in this embodiment of this application may correspond to the network device in the method embodiments of this application, and the foregoing operations and/or functions and other operations and/or functions of the units in the network device400are respectively for implementing corresponding procedures of the network device in the method shown inFIG. 3. For brevity, details are not described herein again.

As shown inFIG. 6, an embodiment of this application further provides a terminal device500. The terminal device500may be the terminal device300inFIG. 4, and can be configured to perform the content of the terminal device corresponding to the method100inFIG. 2. The terminal device500includes an input interface510, an output interface520, a processor530, and a memory540. The input interface510, the output interface520, the processor530, and the memory540may be connected by using a bus system. The memory540is configured to store a program, an instruction or code. The processor530is configured to execute the program, instruction or code in the memory540, to control the input interface510to receive a signal and control the output interface520to send a signal, to complete the operations in the method embodiments.

Therefore, the terminal device in this embodiment of this application, thereby helping improve the accuracy of uplink power control, so that system transmission performance can be improved.

The memory540may include a read-only memory (ROM) and a random access memory (RAM), and provide an instruction and data to the processor530. A part of the memory540may further include a non-volatile RAM. For example, the memory540may further store device type information.

In an implementation process, each piece of content of the foregoing methods may be implemented by a hardware-integrated logic circuit in the processor530or by an instruction in a software form. The content of the method disclosed with reference to the embodiments of this application may be directly performed by a hardware processor, or may be performed by using a combination of hardware in the processor and a software module. The software module may be located in a mature storage medium in the field, such as a RAM, a flash memory, a ROM, a programmable read-only memory (PROM), an electrically-erasable programmable memory or a register. The storage medium is located in the memory540, and the processor530reads information in the memory540and completes the content in the foregoing methods in combination with hardware of the processor. To avoid repetition, details are not described herein again.

In a specific implementation, the first determining unit, the second determining unit, the third determining unit, and the fourth determining unit in the terminal device300may be implemented by the processor530inFIG. 6. The sending unit of the terminal device300may be implemented by the output interface520inFIG. 6. The first receiving unit and the second receiving unit in the terminal device300may be implemented by the input interface510inFIG. 6.

As shown inFIG. 7, an embodiment of this application further provides a network device600. The network device600may be the network device400inFIG. 5, and can be configured to perform the content of the network device corresponding to the method200inFIG. 3. The network device600includes an input interface610, an output interface620, a processor630, and a memory640. The input interface610, the output interface620, the processor630, and the memory640may be connected by using a bus system. The memory640is configured to store a program, an instruction or code. The processor630is configured to execute the program, instruction or code in the memory640, to control the input interface610to receive a signal and control the output interface620to send a signal, to complete the operations in the method embodiments.

Therefore, the network device in this embodiment of this application, thereby helping improve the accuracy of power control, so that system transmission performance is improved.

It should be understood that, in this embodiment of this application, the processor630may be a CPU. The processor630may be another general purpose processor, a DSP, an ASIC, an FPGA or another programmable logic device, a discrete gate or a transistor logic device, or a discrete hardware component or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor and the like.

The memory640may include a ROM and a RAM, and provide an instruction and data to the processor630. A part of the memory640may further include a non-volatile RAM. For example, the memory640may further store device type information.

In an implementation process, each piece of content of the foregoing methods may be implemented by a hardware-integrated logic circuit in the processor630or by an instruction in a software form. The content of the method disclosed with reference to the embodiments of this application may be directly performed by a hardware processor, or may be performed by using a combination of hardware in the processor and a software module. The software module may be located in a mature storage medium in the field, such as a RAM, a flash memory, a ROM, a PROM, an electrically-erasable programmable memory or a register. The storage medium is located in the memory640, and the processor630reads information in the memory640and completes the content in the foregoing methods in combination with hardware of the processor. To avoid repetition, details are not described herein again.

In a specific implementation, the first sending unit and the second sending unit in the network device400may be implemented by the output interface620inFIG. 7, and the receiving unit in the network device400may be implemented by the input interface610inFIG. 7.