Power control method and apparatus

Abstract

The present application relates to the field of communications, and provides a power control method and apparatus. The method comprises: a network device sends first information to a terminal device, wherein the first information is used for updating a first power of a first uplink signal, and the first power is a maximum transmit power that the terminal device can use when transmitting the first uplink signal; on the basis of the first information, the terminal device acquires a second power, wherein the second power is the updated first power, and the terminal device transmits the first uplink signal to the network device, wherein the transmit power of the first uplink signal is determined on the basis of the second power. Thus, the first power is not fixed and can be updated, which helps improve the flexibility of an uplink power control method.

Description

Power control method and apparatus

[0001] This application claims priority from the Chinese patent application No. 202410956983.X filed on July 16, 2024, and entitled "Power control method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and in particular to a power control method and apparatus in the field of communication. BACKGROUND

[0003] A terminal device can communicate with a network device. For example, the terminal device can send an uplink signal to the network device. In response to the uplink signal, the network device can send a downlink signal to the terminal device.

[0004] Before the terminal device sends the uplink signal to the network device, the terminal device needs to determine the transmission power of the uplink signal by an uplink power control method. For example, the terminal device can determine the transmission power of the uplink signal by information such as maximum transmission power, path loss, open-loop power control, and closed-loop power control.

[0005] Currently, the flexibility of the uplink power control method is poor. SUMMARY

[0006] The present application provides a power control method and apparatus, which is beneficial to improve the flexibility of the uplink power control method.

[0007] In a first aspect, a power control method is provided. The method comprises: receiving first information, the first information being used to update a first power, the first power being a maximum transmission power that can be used by a first communication device when sending a first uplink signal; obtaining a second power, the second power being the updated first power; and sending the first uplink signal, a transmission power of the first uplink signal being determined based on the second power.

[0008] In an example, the method can be performed by the first communication device. The first communication device can be the first communication device or a chip or circuit that can be applied to the first communication device, and the embodiments of the present application do not limit this.

[0009] The power control method provided by the present application can update the first power by the first information. The first power is not fixed. In this way, in addition to the first communication device being able to perform power control based on other parameters such as open-loop power control and closed-loop power control, the first communication device can also determine the transmission power of the first uplink signal based on the updated first power, which is beneficial to improve the flexibility of the uplink power control.

[0010] In a possible implementation, the first information includes a first indication field, and the first indication field is used to indicate the second power, or the first indication field is used to indicate a difference between the second power and the first power.

[0011] In one case, the first indication field can be used to indicate the second power. In this way, the first indication field directly indicates the updated value, and implementation is simple.

[0012] In another case, the first indication field can be used to indicate a difference between the second power and the first power. In this way, the first indication field is used to indicate a difference between the second power and the first power, and does not directly indicate the updated value, which is beneficial to saving signaling overhead.

[0013] In a possible implementation, the first information includes a second indication field, and the second indication field is used to indicate at least one of a transmission waveform of the first uplink signal or a modulation mode of the first uplink signal.

[0014] In this way, the transmission waveform of the first uplink signal, the modulation mode of the first uplink signal, and the first power have a corresponding relationship, and the network device indicates the transmission waveform of the first uplink signal and / or the modulation mode of the first uplink signal, which is beneficial to the first communication device accurately determining the first power.

[0015] In a possible implementation, the first information further includes at least one third indication field, and the at least one third indication field is used to indicate updating at least one third power, the third power being a maximum transmit power that can be used by the first communication device when transmitting a second uplink signal, the first uplink signal corresponding to a first transmission reception point (TRP), the second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP; and the method further includes: obtaining at least one fourth power, the at least one fourth power being the updated at least one third power; and transmitting the at least one second uplink signal, a transmit power of the at least one second uplink signal being determined based on the at least one fourth power.

[0016] In this way, the first information can be used to indicate updating multiple powers at the same time, which is beneficial to saving signaling overhead.

[0017] In a possible implementation, the first information further includes at least one fourth indication field, and the at least one fourth indication field is used to indicate at least one of a transmission waveform of the at least one second uplink signal or a modulation mode of the at least one second uplink signal.

[0018] In this way, the fourth indication field indicates the transmission waveform of the at least one second uplink signal and / or the modulation mode of the at least one second uplink signal, and the first communication device can determine the at least one third power and update, which facilitates the first communication device to update the at least one third power.

[0019] In a possible implementation, before the first uplink signal is sent, the method further includes: receiving second information, the second information being used to activate a target mode, the target mode including determining the transmission power of the first uplink signal based on the second power.

[0020] In this way, after the first communication device receives the second information used to activate the target mode, the transmission power of the first uplink signal is determined based on the second power, which facilitates reducing the probability of misuse.

[0021] In a possible implementation, a logical channel ID (LCID) field or an extended logical channel identifier (eLCID) field in the second information is used to indicate the activation of the target mode.

[0022] In this way, the LCID field or the eLCID field is used to indicate the activation or deactivation of the target mode, which facilitates saving the field overhead.

[0023] In a possible implementation, the method further includes: sending third information, the third information including a difference between the second power and the transmission power of the first uplink signal.

[0024] In this way, the first communication device reports the difference between the second power and the transmission power of the first uplink signal to the network device, which facilitates the network device to issue more reasonable configurations, so that the first communication device can perform uplink power control more reasonably.

[0025] In a possible implementation, before the third information is sent, the method further includes: receiving information used to indicate that the difference is reported, and sending the third information can include: in response to the information used to indicate that the difference is reported, sending the third information.

[0026] In this way, the difference is reported when the network device indicates the first communication device to report the difference, which facilitates the network device to obtain the required information and improves the system stability.

[0027] In a possible implementation, after the third information is sent, the method further includes: receiving fourth information, the fourth information being used to indicate updating the second power; and wherein the fourth information is not effective before the third information is sent, or the fourth information is received after the third information is sent. In this way, the first communication device receives information (i.e., the fourth information) for updating the power again, which is effective after the third information is reported, or receives information for updating the power again after the difference value is reported by the third information, which is conducive to improving system stability.

[0028] In a second aspect, another power control method is provided, which includes: sending first information, the first information being used to update a first power, the first power being a maximum transmission power that can be used by a terminal device when sending a first uplink signal; and receiving the first uplink signal, a transmission power of the first uplink signal being determined based on a second power, the second power being the updated first power.

[0029] In a possible implementation, the method is performed by a second communication device. The second communication device can be a network device or a chip or circuit that can be applied to a network device.

[0030] In a possible implementation, the first information includes a first indication field, the first indication field being used to indicate the second power, or the first indication field being used to indicate a difference value between the second power and the first power.

[0031] In a possible implementation, the first information includes a second indication field, the second indication field being used to indicate at least one of a transmission waveform and a modulation mode of the first uplink signal.

[0032] In a possible implementation, the first information further includes at least one third indication field, the at least one third indication field being used to indicate updating at least one third power, the third power being a maximum transmission power that can be used by the terminal device when sending a second uplink signal, the first uplink signal corresponding to a first transmission and reception point (TRP), the second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP; and the method further includes: receiving the at least one second uplink signal, a transmission power of the at least one second uplink signal being determined based on at least one fourth power, the at least one fourth power being the updated at least one third power.

[0033] In a possible implementation, the first information further includes at least one fourth indication field, the at least one fourth indication field being used to indicate at least one of a transmission waveform and a modulation mode of the at least one second uplink signal.

[0034] In a possible implementation, before receiving the first uplink signal, the method further includes: sending second information, the second information being used to activate a target mode, the target mode including determining the transmission power of the first uplink signal based on the second power.

[0035] In a possible implementation, a logical channel identifier LCID field or an extended logical channel identifier eLCID field in the second information is used to indicate the activation of the target mode.

[0036] In a possible implementation, the method further includes: receiving third information, the third information including a difference between the second power and the transmission power of the first uplink signal.

[0037] In a possible implementation, before receiving the third information, the method further includes: sending information used to indicate reporting the difference, and receiving the third information can include: receiving the third information used to respond to the information used to indicate reporting the difference.

[0038] In a possible implementation, the method further includes: sending fourth information, the fourth information being used to indicate updating the second power; and wherein the fourth information is not effective before receiving the third information, or the fourth information is sent after receiving the third information.

[0039] In a possible implementation, the first information is carried in medium access control-control element (MAC-CE) signaling.

[0040] In a third aspect, a communication apparatus is provided, which is configured to execute the method in any possible implementation of the first aspect or the second aspect. Specifically, the communication apparatus includes modules configured to execute the method in any possible implementation of the first aspect or the second aspect.

[0041] In a fourth aspect, another communication apparatus is provided, which includes a processor and a memory coupled with the processor. The processor is configured to execute instructions in the memory to implement the method in any possible implementation of the first aspect or the second aspect. Optionally, the communication apparatus further includes the memory. Optionally, the communication apparatus further includes a communication interface, and the processor is coupled with the communication interface.

[0042] In an implementation, the communication apparatus is a terminal device or a network device. When the communication apparatus is a terminal device or a network device, the communication interface can be a transceiver, or an input / output interface.

[0043] In another implementation, the communication apparatus is a chip applicable to a terminal device or a network device. When the communication apparatus is a chip applicable to a terminal device or a network device, the communication interface can be an input / output interface.

[0044] In a fifth 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 performs the method in any possible implementation of the first aspect or the second aspect.

[0045] In a specific implementation process, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop, various logic circuits and the like. The input signal received by the input circuit can be received and input by, for example but not limited to, a receiver, the signal output by the output circuit can be output to and transmitted by, for example but not limited to, a transmitter, and the input circuit and the output circuit can be the same circuit which is used as the input circuit and the output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0046] In a sixth aspect, a communication apparatus is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory, and can receive a signal through a receiver and transmit a signal through a transmitter to perform the method in any possible implementation of the first aspect or the second aspect.

[0047] Optionally, the processor is one or more, and the memory is one or more.

[0048] Optionally, the memory can be integrated with the processor, or the memory and the processor can be separately arranged.

[0049] In a specific implementation process, the memory can be a non-transitory memory, for example, a read only memory (ROM), which can be integrated on the same chip with the processor, or can be arranged on different chips respectively. The type of the memory and the arrangement manner of the memory and the processor are not limited in the present application.

[0050] It should be understood that the related data interaction process, for example, the process of transmitting the indication information can be the process of outputting the indication information from the processor, and the process of receiving the capability information can be the process of receiving the input capability information by the processor. Specifically, the processed output data can be output to the transmitter, and the input data received by the processor can come from the receiver. The transmitter and the receiver can be collectively referred to as a transceiver.

[0051] The communication device in the sixth aspect can be a chip, and the processor can be implemented by hardware or 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 processor, which reads software codes stored in a memory to implement the processor. The memory can be integrated in the processor or exist independently of the processor.

[0052] In a seventh aspect, a computer program product is provided, which includes a computer program (also referred to as code or instructions), which, when executed, causes a computer to perform the method in any possible implementation of the first aspect or the second aspect.

[0053] In an eighth aspect, a computer readable storage medium is provided, which stores a computer program (also referred to as code or instructions), which, when executed on a computer, causes the computer to perform the method in any possible implementation of the first aspect or the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0054] FIG. 1 is a schematic diagram of DPD processing;

[0055] FIG. 2 is a function diagram;

[0056] FIG. 3 is a schematic diagram of a module for calculating a function corresponding to DPD;

[0057] FIG. 4 is an architecture diagram of HBF;

[0058] FIG. 5 is a schematic diagram of calculating ACLR;

[0059] FIG. 6 is a schematic diagram of calculating EVM;

[0060] FIG. 7 is a schematic diagram of coverage of uplink signals of different modulation orders;

[0061] FIG. 8 is a schematic diagram of structure of subPDU in MAC PDU;

[0062] FIG. 9 is a schematic diagram of function of LCID field;

[0063] FIG. 10 is a schematic diagram of a communication system to which embodiments of the present application are applied;

[0064] FIG. 11 is a schematic diagram of a flow of a power control method provided by embodiments of the present application;

[0065] FIG. 12 is a schematic diagram of an indication field of first information provided by embodiments of the present application;

[0066] FIG. 13 is a schematic diagram of another indication field of first information according to an embodiment of the present application;

[0067] FIG. 14 is a schematic diagram of yet another indication field of first information according to an embodiment of the present application;

[0068] FIG. 15 is a schematic diagram of another indication field of first information according to an embodiment of the present application;

[0069] FIG. 16 is a schematic diagram of yet another indication field of first information according to an embodiment of the present application;

[0070] FIG. 17 is a schematic diagram of a communication architecture according to an embodiment of the present application;

[0071] FIG. 18 is a schematic flowchart of a power control method according to an embodiment of the present application;

[0072] FIG. 19 is a schematic diagram of a time-frequency resource structure according to an embodiment of the present application;

[0073] FIG. 20 is a schematic diagram of another time-frequency resource structure according to an embodiment of the present application;

[0074] FIG. 21 is a schematic diagram of a MAC-CE signaling taking effect time according to an embodiment of the present application;

[0075] FIG. 22 is a schematic block diagram of a communication apparatus according to an embodiment of the present application;

[0076] FIG. 23 is a schematic diagram of another communication apparatus according to an embodiment of the present application;

[0077] FIG. 24 is a schematic diagram of a network element function division and protocol layer structure of an O-RAN device according to an embodiment of the present application. DETAILED DESCRIPTION

[0078] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0079] In the embodiments of the present application, the same items or similar items with basically the same functions and effects are distinguished by using "first", "second", etc. For example, the first information and the second information are only used to distinguish different information, and do not limit the order. Those skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. also do not necessarily mean different.

[0080] It should be noted that the words "exemplary" and "for example" are used herein to mean "serving as an example, instance, or illustration," in order to convey the sense of occasions disclosed herein. For example, any embodiment or design scheme described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or design schemes. Rather, use of the words "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0081] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described, and it is indicated that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character "or" generally represents the relationship between the preceding and following associated objects as "or". "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0082] It should be noted that the nomenclature of signaling and terms in the embodiments of the present application can also refer to the explanation in the 3rd generation partnership project (3rd generation partnership project, 3GPP) standard protocol, such as TS 38.211, 38.214, 38.321, 38.331, and 38.101. The letter case and space of signaling in the embodiments of the present application are only for example, and the specific provisions are subject to the provisions in the standard protocol.

[0083] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), worldwide interoperability for microwave access (worldwide interoperability for microwave access, WiMAX) communication system, 5th generation (5th generation, 5G) system or new radio (new radio, NR), future communication system, etc.

[0084] The terminal device in the embodiments of the present application can also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile terminal, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, etc.

[0085] The terminal device can be a device that provides voice / data connectivity to a user, such as a handheld device with wireless connectivity, a vehicle-mounted device, etc. Currently, some examples of terminal devices include a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc. The present application is not limited thereto.

[0086] By way of example, and without limitation, in the present application, the terminal device can be a terminal device in an internet of things (IoT) system. The internet of things is an important component of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection. Illustratively, the terminal device in the embodiments of the present application can be a wearable device. The wearable device can also be referred to as a wearable smart device, which is a general term for smart devices that can be worn, such as glasses, gloves, watches, clothing, and shoes, which are designed and developed by wearable technology. The wearable device is a portable device that can be directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also can realize powerful functions through software support, data interaction, and cloud interaction. The general wearable smart device includes a full function, large size, and can realize complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, and only focuses on a certain application function, and needs to cooperate with other devices such as a smart phone, such as various smart wristbands, smart jewelry, and the like for monitoring vital signs.

[0087] By way of example, and without limitation, in the embodiments of the present application, the terminal device can also be a terminal device in machine type communication (MTC). In addition, the terminal device can also be a vehicle-mounted module, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit, etc. built-in as one or more components or units in a vehicle. The vehicle can implement the method provided in the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit, etc. Therefore, the embodiments of the present application can also be applied to the Internet of Vehicles, such as vehicle to everything (V2X), long term evolution-vehicle (LTE-V), vehicle-to-vehicle (V2V) technology, etc.

[0088] The network device involved in the present application can be a device in communication with a terminal device, which can also be referred to as an access network device or a radio access network device, which can be a TRP, and can also be an evolved NodeB (eNB or eNodeB) in an LTE system, and can also be a home evolved NodeB (home NodeB, HNB), a baseband unit (BBU), and can also be a wireless controller in a cloud radio access network (CRAN) scenario, or can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a future evolved PLMN network, and can also be an access point (AP) in a WLAN, and can also be a gNB in an NR system, and the network device can also be a city base station, a micro base station, a pico base station, a femto base station, and the like, and the present application does not limit the network device.

[0089] In order to better understand the embodiments of the present application, first, the terms and prior art involved in the embodiments of the present application are introduced.

[0090] 1. Reference signal (RS)

[0091] According to the function, the reference signal can be divided into a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a phase tracking reference signal (PTRS), or a sounding reference signal (SRS), etc.

[0092] The reference signal can be used to obtain a known signal affected by the outside world (for example, a spatial channel, a non-ideal device in the transmitting or receiving end) in the transmission of the signal, which is generally used for channel estimation, auxiliary signal demodulation, or detection. For example, the DMRS and the CSI-RS can be used to obtain channel information, and the PTRS can be used to obtain phase change information.

[0093] 2. Physical downlink shared channel (PDSCH): a channel used to transmit downlink user data and the like.

[0094] 3. Physical uplink shared channel (PUSCH): a channel used for transmitting uplink user data and the like.

[0095] 4. Physical downlink control channel (PDCCH): a channel used for transmitting downlink control information (DCI), including scheduling allocation of a PDSCH, scheduling grant, and power control information. The resources carried can occupy the first {1, 2, 3} symbols of a slot in the time domain, can occupy the full bandwidth in the frequency domain, or can be configured by parameters, and embodiments of the present application do not limit this.

[0096] 5. Physical uplink control channel (PUCCH): a channel used for transmitting uplink control information (UCI), hybrid automatic repeat request-acknowledgement (HARQ-ACK), scheduling request (SR), and channel status information (CSI) feedback, and the like.

[0097] 6. Power amplifier (PA)

[0098] The PA can amplify a low-power signal generated by a network device or a terminal device to a power level that can be transmitted over a long distance, and is a core device of a wireless communication device. When power amplification is performed, the PA can introduce nonlinear distortion, resulting in deterioration of performance indicators of a transmitted signal.

[0099] 7. Digital predistortion (DPD) technology

[0100] The DPD technology is an effective means to improve the linearity of a PA output signal. The basic principle is to perform digital preprocessing on a signal before power amplification to improve the linearity of the PA output signal. In theory, the DPD corresponding function should be the inverse function of the PA response function.

[0101] Exemplarily, FIG. 1 shows a schematic diagram of a DPD process. As shown in FIG. 1, an input signal is input to the DPD, and the output of the PDP is the input of the PA. The DPD pre-processes the input signal before the PA amplifies the signal.

[0102] The DPD corresponding function is the inverse function of the PA response function, so that the DPD pre-processes the input signal before inputting the signal to the PA for amplification. The output signal of the PA can be linear.

[0103] For example, FIG. 2 shows a function diagram. As shown in FIG. 2, a in FIG. 2 can be a DPD corresponding function, b in FIG. 2 can be a PA response function, the DPD corresponding function is the inverse function of the PA response function, and the superposition of the DPD corresponding function and the PA response function can be linear, as shown by c in FIG. 3.

[0104] The DPD corresponding function can be obtained by the input signal of the PA and the output signal of the PA. Generally, a digital to analog converter (DAC) can be deployed before the PA, and the input signal of the PA can be the input signal of the DAC.

[0105] For example, FIG. 3 shows a module diagram for calculating the DPD corresponding function. As shown in FIG. 3, each transmitting module includes a DPD, a DAC, a PA, and an antenna. The DPD is connected to the DAC, the DAC is connected to the PA, and the PA is connected to the antenna.

[0106] The model extraction module can collect the input signal of the DAC and the output signal of the PA, calculate the PA response function by the input signal of the DAC and the output signal of the PA, calculate the inverse function of the PA response function, and obtain the DPD corresponding function. The model extraction module can store the DPD corresponding function in the DPD.

[0107] As shown in FIG. 3, the transmitting device can include multiple similar transmitting modules, and the PA in each transmitting module can have an independent feedback channel to obtain the DPD corresponding function, which is not described herein again.

[0108] 8. Hybrid beam forming (HBF)

[0109] In the millimeter wave frequency band, the transmitting device uses more antennas to obtain array gain to combat the greater propagation loss of high-frequency signals. For example, a network device in the 26-28 GHz frequency band includes several hundred or several thousand elements. In order to avoid high cost and power consumption caused by large-scale arrays, the terminal device can use HBF.

[0110] Exemplarily, FIG. 4 shows an architecture diagram of an HBF. As shown in FIG. 4, one DAC can correspond to multiple PAs, which are connected with an antenna array. An intermediate frequency (IF) module is connected before the DAC. After the IF module, the signal before the DAC can be the input signal of the PA.

[0111] Since the input signal of the PA corresponds to multiple output signals of the PA, the above-mentioned DPD technology cannot be applied to the HBF architecture.

[0112] 9. Nonlinear evaluation index

[0113] As mentioned above, when power amplification is performed, the PA can introduce nonlinear distortion, resulting in deterioration of the performance index of the transmitted signal. For example, the nonlinear distortion caused by the PA can cause the error vector magnitude (EVM) and the adjacent channel leakage power ratio (ACLR) performance of the transmitted signal to decline.

[0114] Among them, 1) ACLR: due to the nonlinear characteristics of the PA, it can cause intermodulation distortion, so that the spectrum of the original signal is widened to both sides. The ACLR index is used to measure the out-of-band radiation characteristics of the transmitting device, and is defined as the ratio of the signal power falling into the adjacent frequency band signal power and the main band signal power. Since there is signal expansion on both sides of the main channel, the average power of the left and right adjacent bands is usually taken, as follows:

[0115] Among them, P adj1 is the left adjacent band power, P adj2 is the right adjacent band power, and P main is the main channel power. The smaller the value of ACLR, the smaller the interference of the main channel to the adjacent channel, and the better the communication performance.

[0116] Exemplarily, FIG. 5 shows a diagram for calculating ACLR. As shown in FIG. 5, the horizontal axis is frequency and the vertical axis is power. There is signal expansion on both sides of the main channel. By the waveform shown in FIG. 5, the main channel power and the average power of the adjacent channels on both sides of the main channel can be calculated, and the average power of the adjacent channels on both sides of the main channel and the main channel power are brought into the above formula to obtain ACLR.

[0117] 2) EVM: In an actual communication system, due to the influence of factors such as the nonlinear characteristics of the PA of the transmitting device or the channel estimation error, there will be a deviation between the signal constellation diagram after demodulation of the receiving device and the ideal (original) signal constellation diagram. The more serious the nonlinear characteristics of the PA, the greater the deviation, and the EVM can well describe the in-band distortion of the signal.

[0118] Exemplarily, FIG. 6 shows a schematic diagram of calculating EVM. As shown in FIG. 6, EVM is the deviation between the actual vector of demodulated constellation points and the original constellation point vector. EVM can satisfy the following formula:

[0119] wherein (I r ,Q r ) is the constellation diagram of the received signal after demodulation, (I o ,Q o ) is the constellation diagram of the original signal.

[0120] 10. Maximum power reduction (MPR)

[0121] Since the demodulation EVM of different modulation signals is different, and the peak-to-average power ratio (PAPR) of different waveforms is different, the 38.101 protocol stipulates different MPRs to meet the performance indicators of the signals.

[0122] Exemplarily, Table 1 shows a schematic diagram of the correspondence between a modulation signal, a waveform and an MPR.

[0123] Table 1

[0124] As shown in Table 1, the unit of MPR is decibel (dB). The waveform of the signal can include discrete Fourier spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM).

[0125] The modulation mode can include: Pi / 2 binary phase shift keying (Pi / 2BPSK), quadrature phase shift keying (QPSK), 16-order quadrature amplitude modulation (QAM), 64-order QAM and 256-order QAM.

[0126] Different MPR values correspond to edge RB allocations, outer RB allocations, and inner RB allocations.

[0127] The correspondence between the waveform of the signal, the modulation mode, the edge RB allocation, the outer RB allocation, and the inner RB allocation can be as shown in Table 1, which is not described herein again.

[0128] The MPR causes the transmission power of the uplink signal of the terminal device to be small, resulting in a limited coverage area of the modulated uplink signal.

[0129] Exemplarily, FIG. 7 shows a schematic diagram of the coverage range of the uplink signal of each modulation order. As shown in FIG. 7, the modulation mode can include 256QAM, 64QAM, 16QAM, and QPSK. The higher the complexity of the modulation order, the smaller the coverage range of the modulated uplink signal. The complexity of 256QAM, 64QAM, 16QAM, and QPSK gradually decreases, and therefore the coverage range of the modulated uplink signal gradually increases.

[0130] In FIG. 7, a represents the coverage range of the uplink signal of each modulation order without MPR limitation. In FIG. 7, b represents the coverage range of the uplink signal of each modulation order with MPR limitation. As can be seen from the comparison between a and b in FIG. 7, the coverage range of the uplink signal of each modulation order with MPR limitation is smaller than the coverage range of the uplink signal of each modulation order without MPR limitation.

[0131] 11. MAC-CE format

[0132] A sub-header is connected to each MAC-CE in the MAC message, and the LCID field can be included in the sub-header. The LCID field can be used to indicate the specific meaning of the MAC-CE. Embodiments of the present application take the MAC protocol data unit (PDU) as an example to introduce the LCID field of the sub-protocol data unit (subPDU) in the MAC PDU.

[0133] Exemplarily, FIG. 8 shows a schematic diagram of the structure of the subPDU in the MAC PDU. As shown in FIG. 8, the MAC subPDU includes a MAC-CE of a fixed length, and a sub-header is connected to the MAC-CE. The sub-header includes the LCID field and the R field, wherein the LCID field can indicate that the MAC-CE has the functions of activation or deactivation. The R field can represent a reserved field.

[0134] The Downlink Shared Channel (DL-SCH) also includes an LCID field. In the DL-SCH, the LCID field is 6 bits long. When these 6 bits are 55, it indicates that the subsequent MAC-CE has the function of activating / deactivating the SP (Channel Status Information Reference Signal) / Channel State Information-Interference Measurement (CSI-IM) resource set.

[0135] For example, Figure 9 illustrates a schematic diagram of the LCID field function. As shown in Figure 9, the LCID field has a length of 6 bits. When the value of these 6 bits is 55, the LCID field can be used to activate or deactivate the SP CSI-RS / CSI-IM resource set function.

[0136] 12. Uplink power control technology

[0137] Before sending uplink signals, terminal equipment needs to determine the transmit power of the uplink signals. The method by which terminal equipment determines the transmit power of uplink signals can be called uplink power control technology.

[0138] In uplink power control, network devices can send transmit power control (TPC) to terminal devices through DCI in PDCCH. Terminal devices can map TPC to power adjustment amount and determine the transmit power of uplink signals based on their own maximum transmit power, path loss, number of RBs and transmission format.

[0139] In one example, the power P of PUSCH PUSCH It can be determined by the following formula:

[0140] Among them, P CMAX α is the maximum transmit power of the terminal device. PUSCH PL is the path loss compensation factor, where PL is the downlink path loss estimated by the terminal equipment, and M is the path loss compensation factor. PUSCH (i) represents the number of RBs, Δ TF (i) represents the MCS power adjustment amount. The network device expects a certain receive power level for each RB. For open-loop power control, f(i) represents closed-loop power control, and μ is related to the subcarrier spacing, corresponding to it. For example, μ is 0 when the subcarrier spacing is 15kHz; μ is 1 when the subcarrier spacing is 15kHz.

[0141] To make the present application more comprehensible, first, a communication system applicable to the embodiments of the present application is described in detail in combination with FIG. 10.

[0142] FIG. 10 is a schematic diagram of a communication system 1000 applicable to the embodiments of the present application. The communication system 1000 can include at least one network device, for example, the network device 1010 shown in FIG. 10, and can also include at least one terminal device, for example, the terminal device 1020 shown in FIG. 10. The network device 1010 and the terminal device 1020 can communicate through a wireless link. In one possible case, the network device 1010 can serve as a sending end, and the terminal device 1020 can serve as a receiving end, and the network device 1010 sends a downlink signal to the terminal device 1020. In another possible case, the network device 1010 can serve as a receiving end, and the terminal device 1020 can serve as a sending end, and the terminal device 1020 sends an uplink signal to the network device 1010.

[0143] FIG. 10 exemplarily shows one network device 1010 and one terminal device 1020. Optionally, the communication system 1000 can also include multiple network devices and / or multiple terminal devices. The network device 1010 can be a router, a base station, etc., and the terminal device 1020 can be a mobile phone, a tablet computer, a smart bracelet, etc., and the embodiments of the present application are not limited in this regard.

[0144] Each of the above communication devices, such as the network device 1010 or the terminal device 1020 in FIG. 10, can be configured with multiple antennas. The multiple antennas can include at least one transmitting antenna for transmitting a signal and at least one receiving antenna for receiving a signal. In addition, each communication device additionally includes a transmitter chain and a receiver chain, and those skilled in the art can understand that they can each include multiple components (such as a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or an antenna, etc.) related to signal transmission and reception. Therefore, the network device 1010 and the terminal device 1020 can communicate through multi-antenna technology.

[0145] Optionally, the above communication system 1000 can also include a network controller, a mobile management entity, and other network entities, and the embodiments of the present application are not limited in this regard.

[0146] It should also be understood that the method provided by the embodiments of the present application can be applicable to various communication systems including a 5G new radio (NR) system, and the communication system 1000 is only an example, and the present application does not limit the specific architecture of the applicable system, nor the number and form of various devices included in each communication system.

[0147] Currently, before the terminal device 1020 transmits the uplink signal to the network device 1010, the terminal device 1020 needs to determine the transmission power of the uplink signal. As can be known from the above power control technology, the transmission power of the uplink signal is related to the maximum transmission power P CMAX max of the terminal device 1020 CMAX correspondence relationship with the modulation mode, waveform and backoff value of the uplink signal. When the modulation mode, waveform and backoff value of the uplink signal are determined, the maximum transmission power is also determined and cannot be changed. CMAX After the determination, the terminal device 1020 can only perform power control by adjusting other parameters such as the open-loop power amount and the closed-loop power control amount in the power control formula, which leads to poor flexibility of uplink power control.

[0148] Therefore, embodiments of the present application provide a power control method and device, and the network device 1010 can update the P CMAX max of the terminal device 1020 CMAX max can be changed, and the terminal device can determine the transmission power of the uplink signal based on the updated P CMAX max, which is beneficial to improve the flexibility of uplink power control.

[0149] The updated P CMAX max can be greater than the P CMAX max before the update, which may cause the transmission power of the uplink signal to increase, and further cause the PA of the terminal device to appear nonlinear distortion. In this case, after receiving the uplink signal, the network device 1010 can use a receiver nonlinearity compensation (RNC) technology to estimate and compensate the nonlinearity of the PA, so as to meet the demodulation requirement.

[0150] In this way, the flexibility of uplink power control can be improved while reducing the influence of the nonlinear distortion of the PA. Next, in combination with FIGS. 11 to 21, the method provided by the embodiments of the present application will be described in detail. The embodiments shown in the embodiments of the present application show the method provided by the embodiments of the present application from the perspective of device interaction. The specific form and quantity of each device shown are only examples, and should not constitute any limitation on the implementation of the method provided by the embodiments of the present application. Next, taking the network device and the terminal device as the execution subject as an example, the method of the embodiments of the present application will be described in detail.

[0151] It should be understood that the terminal device can be a terminal device itself, a chip, a chip system or a processor supporting the terminal device to implement the method provided in the embodiments of the present application, and can also be a logic module or software capable of implementing all or part of the terminal device; the network device can be a network device itself, a chip, a chip system or a processor supporting the network device to implement the method provided in the embodiments of the present application, or a logic module or software capable of implementing all or part of the network device, and the present application does not make a specific limitation thereon.

[0152] FIG. 11 is a flow diagram of a power control method 1100 provided in the embodiments of the present application. As shown in FIG. 11, the method 1100 can be applicable to the communication system 1100 described above, but the embodiments of the present application are not limited thereto.

[0153] As shown in FIG. 11, the method 1100 can include the following steps:

[0154] S1101, the network device sends first information to the terminal device, and correspondingly, the terminal device receives the first information from the network device. The first information is used to update a first power, and the first power is the maximum transmit power that can be used by the terminal device when sending a first uplink signal.

[0155] In the communication system 1000 shown in FIG. 10 described above, the network device can be the network device 1010 described above, and the terminal device can be the terminal device 1020 described above.

[0156] The first power is the maximum transmit power of the terminal device, that is, the P CMAX MAX described above. The first information is used to update the first power, that is, the first information is used to update the P CMAX .

[0157] The first uplink signal can be a reference signal, such as SRS or DMRS, or the first uplink signal can be a signal used for data transmission, such as PUSCH, and the embodiments of the present application do not make a limitation thereon. The maximum transmit power that can be used when the terminal device sends different uplink signals can be different. In an example, the maximum transmit power that can be used when sending an uplink signal can be related to the modulation mode, the transmission waveform and the MPR of the uplink signal.

[0158] There can be various possible cases for the timing at which the network device sends the first information to the terminal device.

[0159] In a possible implementation, the network device sends the first information to the terminal device when the terminal device successfully accesses the network device.

[0160] Exemplarily, the terminal device sends an access request to the network device to request to access the network device. In response to the access request, the network device sends an access acceptance message to the terminal device to indicate that the access is successful. After sending the access acceptance message, the network device can send the first information to the terminal device.

[0161] In this way, the updated first power is used in the process of communication between the terminal device and the network device.

[0162] In another possible implementation, the network device sends the first information to the terminal device when instructing the terminal device to upload an uplink signal.

[0163] Exemplarily, the network device sends the first information to the terminal device when instructing the terminal device to upload an SRS, so that the terminal device uses the updated first power to determine the transmission power of the SRS.

[0164] In this way, the first power can be updated flexibly for part of the uplink signal.

[0165] The first information can be carried in existing signaling in existing communication technology, or can be carried in newly defined signaling, and the embodiments of the present application do not limit this.

[0166] If the first information is carried in existing signaling in existing communication technology, in an example, the first information can be carried in MAC-CE, DCI, or radio resource control (RRC) signaling.

[0167] In this way, using existing signaling in existing communication technology helps to increase the scalability of existing signaling.

[0168] Before sending the first information to the terminal device, the network device can first determine that the maximum transmission power of the terminal device is the first power. The network device determining that the maximum transmission power of the terminal device is the first power can include various possible implementation manners.

[0169] In a possible implementation, the terminal device sends information that the maximum transmission power of the terminal device is the first power to the network device, and the network device can determine that the maximum transmission power of the terminal device is the first power based on the information, and instruct the terminal device to update the first power through the first information.

[0170] Exemplarily, the terminal device can send P CMAX (i) to the network device to indicate the maximum transmission power of the terminal device in the time domain resource i. The network device receives P CMAX (i), and instructs the terminal device to update P CMAX (i) through the first information.

[0171] In this way, the terminal device directly reports the maximum transmit power of the terminal device to the network device, and the network device directly receives the maximum transmit power of the terminal device without the need for complex calculation, and the implementation is simple.

[0172] In another possible implementation, the network device can instruct the terminal device to send a signal same as the modulation mode and the transmission waveform of the first uplink signal, and the network device can determine the first power through the correspondence between the modulation mode, the transmission waveform, and the power.

[0173] In this way, the terminal device does not need to directly report the first power, and the network device can determine the first power without awareness of the terminal device.

[0174] S1102, based on the first information, the terminal device can obtain the second power, and the second power is the updated first power.

[0175] Based on the first information, the terminal device can update the first power to obtain the second power.

[0176] S1103, the terminal device can send the first uplink signal to the network device, and the transmit power of the first uplink signal is determined based on the second power.

[0177] The terminal device can determine the transmit power of the first uplink signal based on the second power and the above-mentioned uplink power control technology. The second power can be greater than the first power, or can be less than the first power, which is not limited in the embodiments of the present application.

[0178] The power control method provided by the embodiments of the present application can update the first power through the first information, and the first power is not fixed. In this way, in addition to the power control based on the open-loop power amount, the closed-loop power control amount and other parameters, the terminal device can also determine the transmit power of the first uplink signal based on the updated first power, which is conducive to improving the flexibility of uplink power control.

[0179] In the above method 1100, after receiving the first information, the terminal device can use the updated first power (i.e. the second power) to determine the transmit power of the first uplink signal. In other examples, the network device can send activation signaling to the terminal device, and after receiving the activation signaling, the terminal device uses the updated first power to determine the transmit power of the first uplink signal. If the terminal device does not receive the activation signaling, the terminal device can use the first power to determine the transmit power of the first uplink signal.

[0180] Exemplarily, before the terminal device sends the first uplink signal to the network device at S1103, the method 1100 further includes: the network device can send second information to the terminal device, and correspondingly, the terminal device can receive the second information from the network device. The second information is used to activate the target mode, and the target mode includes determining the transmission power of the first uplink signal based on the second power.

[0181] The second information can be understood as activation signaling. In this way, the network device can flexibly control whether the terminal device uses the second power to determine the transmission power of the first uplink signal.

[0182] The second information can share the same signaling or message as the first information, or can use different signaling or messages respectively, and the embodiments of the present application do not limit this. The second information shares the same signaling as the first information, so that one signaling can indicate multiple information, which is beneficial to saving signaling overhead.

[0183] Optionally, the activation of the target mode can be indicated by a field in the second information. The field can be a reserved field in the second information, or can be an original field in the second information.

[0184] If the reserved field in the second information is used to indicate the activation of the target mode, it is beneficial to not affect other fields in the signaling.

[0185] If the original field in the second information is used to indicate the activation of the target mode, in addition to including the original function, the field also includes the function of indicating the activation of the target mode, which is beneficial to saving field overhead.

[0186] As shown in FIG. 6, there is a header before the MAC-CE, and the header includes an LCID field. As shown in FIG. 7, when the LCID field takes the value 55, it has the function of activating or deactivating a resource set, so the embodiments of the present application can use the LCID field or an extended logical channel identifier eLCID field in the second information to indicate the activation of the target mode.

[0187] The LCID field or the eLCID field can include one or more bits, and the embodiments of the present application do not limit this. If the LCID field or the eLCID field includes multiple bits, in an example, the LCID field or the eLCID field can include 4 bits, 6 bits, or 8 bits.

[0188] In an example, the embodiments of the present application can use a reserved value of the LCID field in the MAC-CE to indicate the activation of the target mode. Table 2 shows an example of using a reserved value of the LCID field to indicate the activation of the target mode.

[0189] Table 2

[0190] As shown in Table 2, the code points can be represented by binary bits. The LCID field can include 6 bits, the bit values 37-42 of the 6 bits are reserved values, the bit value 43 (101011) of the 6 bits can be used to indicate the activation target mode. The bit value 44 (101100) of the 6 bits can be used to indicate the timing advance report (Timing Advance Report). The bit value 57 (111001) of the 6 bits can be used to indicate the single power headroom report (Single Entry PHR).

[0191] In another example, the embodiment of the present application can use the reserved value of the eLCID field to indicate the activation target mode. Table 3 shows a schematic for indicating the activation target mode using the reserved value of the eLCID field.

[0192] Table 3

[0193] As shown in Table 3, the code points can be represented by binary bits, and each code point corresponds to an index. The eLCID field can include 8 bits, the bit values 0-248 of the 8 bits are reserved values, and the corresponding indexes are 64-312. The bit value 249 (11111001) of the 8 bits, corresponding to the index 313, can be used to indicate the activation target mode. The bit value 250 (11111010) of the 8 bits, corresponding to the index 314, can be used to indicate the beam failure recovery (BFR). The bit value 255 (11111111) of the 8 bits, corresponding to the index 319, can be used to indicate the pre-emptive buffer status report (Pre-emptive BSR).

[0194] After the network device activates the target mode through the LCID field or the eLCID field, the network device can also deactivate the target mode. For example, the network device activates the target mode through the LCID field or the eLCID field in the second information, and indicates to update the first power through the first information. The terminal device determines the transmission power of the first uplink signal based on the second power, and the terminal device sends the first uplink signal to the network device. When it is not necessary to determine the transmission power based on the updated power, the network device can indicate to the terminal device to deactivate the target mode.

[0195] The network device can use a field different from the above LCID field or eLCID field to indicate to deactivate the target mode, or can indicate to deactivate the target mode through the above LCID field or eLCID field, and the embodiment of the present application does not limit this.

[0196] If the LCID field or the eLCID field is also used to indicate the deactivation target mode, code point 43 in Table Two can correspond to the activation or deactivation target mode, and code point 249 in Table Three can correspond to the activation or deactivation target mode.

[0197] In this way, the LCID field or the eLCID field is used to indicate the activation or deactivation target mode, which facilitates saving field overhead. In addition, the network device can control the timing at which the terminal device activates or deactivates the target mode, which is more flexible.

[0198] To better communicate, before the network device indicates to the terminal device to activate the target mode, the terminal device can report to the network device whether the terminal device has the capability to support the target mode, and if the terminal device has the capability to support the target mode, the network device can activate the target mode. If the terminal device does not have the capability to support the target mode, the network device can not activate the target mode.

[0199] In this way, the terminal device reports to the network device whether the terminal device has the capability to support the target mode, which facilitates the network device to more reasonably activate the target mode of the terminal device.

[0200] As an optional embodiment, the first information can include a first indication field, and the first indication field is used to indicate the second power, or the first indication field is used to indicate a difference between the second power and the first power.

[0201] The first indication field is only an example of a name, and embodiments of the present application do not limit the same. The first indication field can include one or more bits. If the first indication field includes multiple bits, in an example, the first indication field can include 4 bits, 5 bits, or 6 bits.

[0202] The first indication field used to indicate the updated first power can include various possible implementation manners.

[0203] In a possible implementation manner, the first indication field can be used to indicate the second power.

[0204] The second power is the updated first power, and the second power can be referred to as P CMAX (i+1).

[0205] For example, in the time domain resource i, the first power can be represented by P CMAX (i), the second power can be represented by P CMAX (i+1), and the first indication field can directly indicate P CMAX (i+1).

[0206] In this way, the first indicator field directly indicates the updated value, which is simple to implement.

[0207] In another possible implementation, the first indicator field can be used to indicate the difference between the second power and the first power.

[0208] The difference between the second power and the first power can be called P. CMAX The change value. Since the second power can be greater than or less than the first power, the difference between the second power and the first power can be positive or negative.

[0209] For example, within time-domain resource i, the first power can be represented by P. CMAX (i) indicates that the second power can be represented by P. CMAX (i+1) represents the difference between the second power and the first power, denoted by ΔP. CMAX It means that ΔP CMAX =P CMAX (i+1)-P CMAX (i). The first indicator field can be used to indicate ΔP. CMAX ΔP CMAX If the value is positive, then the second power is greater than the first power. ΔP CMAX If the value is negative, then the second power is less than the first power.

[0210] If the first indicator field includes 4 bits, then the value of these 4 bits can range from 0000 to 1111. If ΔP CMAX If ∈-7dB~8dB, then ΔP CMAX Each bit value corresponds one-to-one with the others. For example, a bit value of 0000 indicates that ΔPCMAX is -7dB; a bit value of 0001 indicates that ΔP is -7dB. CMAX The value is -6dB, and so on. When the bit value is 1111, this bit value is used to indicate ΔP. CMAX It is 8dB. Alternatively, when the bit value is 0000, this bit value is used to indicate ΔP. CMAX The value is 8dB; when the bit value is 0001, this bit value is used to indicate ΔP. CMAX The value is 7dB, and so on. When the bit value is 1111, this bit value is used to indicate ΔP. CMAX It is -7dB.

[0211] In this way, the first indication field is used to indicate the difference between the second power and the first power, instead of directly indicating the updated value, which helps to save signaling overhead.

[0212] The above method can be described below with specific examples.

[0213] In an example, the first uplink signal can be a PUSCH, a PUCCH, a physical random access channel (PRACH), or an SRS. The terminal device can determine the transmit power of the first uplink signal based on the first power. The first power can also be referred to as P CMAX (old). The terminal device receives the first information from the network device, and can update the first power to obtain a second power. The second power can also be referred to as P CMAX (new). ΔP CMAX = P CMAX (new) - P CMAX (old). ΔP CMAX may be obtained indirectly or directly through a first indication field of the first information. That is, when the first indication field is used to indicate the second power, ΔP CMAX is obtained indirectly through the first indication field. When the first indication field is used to indicate the difference between the second power and the first power, ΔP CMAX is obtained directly through the first indication field.

[0214] The first power P CMAX is related to the transmission waveform of the first uplink signal and the modulation mode of the first uplink signal, and the first power P CMAX is determined after the transmission waveform of the first uplink signal and the modulation mode of the first uplink signal are determined. The transmission waveform of the first uplink signal and the modulation mode of the first uplink signal can be indicated by the network device, and the indication information can be the same as or different from the first information.

[0215] Exemplarily, the indication information of the transmission waveform and the modulation mode of the first uplink signal and the first information used to update the first power can be one information. For example, the first information includes a second indication field, and the second indication field is used to indicate at least one of the transmission waveform of the first uplink signal or the modulation mode of the first uplink signal.

[0216] The second indication field and the first indication field described above can be different indication fields, which are not limited in the embodiments of the present application. The second indication field can include one or more fields, which are not limited in the embodiments of the present application.

[0217] The transmission waveform of the first uplink signal and the modulation mode of the first uplink signal can be indicated through one indication field, or can be indicated through different indication fields.

[0218] In an example, the transmission waveform of the first uplink signal and the modulation mode of the first uplink signal can be indicated through different indication fields, for example, the second indication field can be used to indicate the transmission waveform of the first uplink signal or the modulation mode of the first uplink signal.

[0219] Exemplarily, the second indication field can be used to indicate the transmission waveform of the first uplink signal. For example, when the second indication field is 0, the second indication field can be used to indicate the transmission waveform of CP-OFDM, and when the second indication field is 1, the second indication field can be used to indicate the transmission waveform of DFT-s-OFDM. Alternatively,

[0220] The second indication field can be used to indicate the modulation mode of the first uplink signal. For example, when the second indication field is 0000, the second indication field can be used to indicate the modulation mode of pi / 2 BPSK, when the second indication field is 0001, the second indication field can be used to indicate the modulation mode of QPSK. When the second indication field is 0010, the second indication field can be used to indicate the modulation mode of 16QAM, and when the second indication field is 0011, the second indication field can be used to indicate the modulation mode of 64QAM. When the second indication field is 0100, the second indication field can be used to indicate the modulation mode of 1KQAM, and when the second indication field is 0101, the second indication field can be used to indicate the modulation mode of 4KQAM.

[0221] In this way, one indication field indicates one information, and after the terminal device receives it, the probability of correctly obtaining the information is high, which is beneficial to improve the stability of communication.

[0222] In another example, the transmission waveform of the first uplink signal and the modulation mode of the first uplink signal can be indicated by one indication field, for example, the second indication field can be used to indicate the transmission waveform of the first uplink signal and the modulation mode of the first uplink signal.

[0223] Exemplarily, the corresponding relationship between the second indication field, the transmission waveform of the first uplink signal, and the modulation mode of the first uplink signal can satisfy the following relationship:

[0224] 0000->DFT-s, pi / 2 BPSK; 0001->DFT-s, QPSK; 0010->DFT-s, 16QAM; 0011->DFT-s, 64QAM; 0100->DFT-s, 256QAM; 0101->CP-OFDM, QPSK; 0110->CP-OFDM, 16QAM; 0111->CP-OFDM, 256QAM; 1000->CP-OFDM, 1KQAM; 1001->CP-OFDM, 4KQAM.

[0225] In this way, one indication field indicates multiple information, which is beneficial to save field overhead and improve communication efficiency.

[0226] In the method, the first information can be used to indicate updating one power. In other examples, the first information can be used to indicate updating multiple powers.

[0227] In an example, the first information can further include at least one third indication field, the at least one third indication field being used to indicate updating at least one third power, the third power being a maximum transmit power that can be used by the terminal device when transmitting a second uplink signal, the first uplink signal corresponding to the first TRP, the second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP; the method further includes: obtaining at least one fourth power, the at least one fourth power being the updated at least one third power, the terminal device transmitting the at least one second uplink signal to the network device, a transmit power of the at least one second uplink signal being determined based on the at least one fourth power.

[0228] The network device includes multiple TRPs, and the terminal device can transmit an uplink signal to each of the multiple TRPs. For example, the network device includes a first TRP and at least one second TRP, the network device can transmit a first uplink signal to the first TRP, and can transmit a second uplink signal to each of the at least one second TRP.

[0229] In this scenario, the first information can be used to indicate updating the first power, and can be used to indicate updating the at least one third power. The third indication field can refer to the first indication field. For example, the third indication field can directly indicate the updated third power, or can indicate a difference between the updated third power and the third power.

[0230] In an example, the first indication field and the third indication field can both be used to indicate an updated value. The first indication field can be represented as Pcmax State0, and the third indication field can be represented as Pcmax State1, the Pcmax State0 being used to indicate the updated first power, and the Pcmax State1 being used to indicate the updated third power.

[0231] In a case where the second uplink signal is multiple, the third indication field can indicate multiple values, and therefore the third indication field can further indicate a relationship between the values. For example, the relationship between the values can be in the form of an increment.

[0232] In an example, the third power of a first second uplink signal can be represented as P1, the updated third power of the first second uplink signal can be represented as P1+D1, the third power of a second second uplink signal can be represented as P2, and the updated third power of the second second uplink signal can be represented as P2+D2. In an example, the third power of a first second uplink signal can be represented as P1, the updated third power of the first second uplink signal can be represented as P1+D1, the third power of a second second uplink signal can be represented as P2, and the updated third power of the second second uplink signal can be represented as P2+D2. ​​The third indication field can indicate ΔPcmax State0 and ΔPcmax State1.

[0233] wherein, and may satisfy and may satisfy

[0234] In this way, one information can indicate the update of the maximum transmission power of multiple uplink signals at the same time, which is beneficial to save signaling overhead.

[0235] It can be understood that the third power is similar to the first power described above, and the third power is related to the transmission waveform of the second uplink signal and the modulation mode of the second uplink signal. When the transmission waveform of the second uplink signal and the modulation mode of the second uplink signal are determined, the third power is determined. The transmission waveform of the second uplink signal and the modulation mode of the second uplink signal can be indicated by the network device, and the indication information can be the same as the first information described above, or can be different.

[0236] Exemplarily, the indication information of the transmission waveform and the modulation mode of the second uplink signal can be one information with the first information for updating the first power. For example, the first information further includes at least one fourth indication field, and the at least one fourth indication field is used to indicate the transmission waveform of at least one second uplink signal and / or the modulation mode of at least one second uplink signal.

[0237] The fourth indication field can refer to the second indication field described above.

[0238] In this way, the network device indicates the transmission waveform of at least one second uplink signal and / or the modulation mode of at least one second uplink signal through the fourth indication field, and the terminal device can determine at least one third power and update it, which is beneficial to realize the terminal device to update at least one third power.

[0239] From the above-described method, it can be known that the first information can include the first indication field, and can further include one or more of the second indication field, the third indication field and the fourth indication field. The first information can also be the same as the second information, and is used to indicate the activation target mode. In some other examples, the first information can also indicate the serving cell index and the partial bandwidth identifier of the terminal device. In order to better understand the first information, the fields in the first information are exemplarily described below.

[0240] In a possible implementation, the first information can include 6 indication fields, which can include indication field 1, indication field 2, indication field 3, indication field 4, indication field 5, and indication field 6. The indication field 1 is used to indicate the first power of the first uplink signal. The indication field 2 is used to indicate whether the indication field 1 exists. The indication field 3 is used to indicate the activation or deactivation of the target mode. The indication field 4 is used to indicate the serving cell index of the terminal device. The indication field 5 is used to indicate the partial bandwidth identification. The indication field 6 is used to indicate the reserved field. It can be understood that the indication field 1 is the first indication field shown in the above.

[0241] Exemplarily, FIG. 12 shows a schematic diagram of indication fields of the first information. As shown in FIG. 12, the first information includes 2 bytes, which are byte 1 (Oct 1) and byte 2 (Oct 2). The byte 1 and the byte 2 each include 8 bits.

[0242] The byte 1 includes ‘A / D’, ‘Serving Cell ID’, and ‘BWP ID’ indication fields. The ‘A / D’ indication field is the indication field 3, which includes 1 bit, and is used to indicate the activation or deactivation of the target mode. The ‘Serving Cell ID’ is the indication field 4, which includes 5 bits, and is used to indicate the serving cell index of the terminal device. The ‘BWP ID’ indication field is the indication field 5, which includes 2 bits, and is used to indicate the partial bandwidth identification.

[0243] The byte 2 includes a ‘C’ field, two ‘R’ fields, and a ‘Pcmax State’ field. The ‘Pcmax State’ field is the indication field 1, which includes 5 bits, and is used to indicate the first power of the first uplink signal. The ‘C’ field is the indication field 2, which includes 1 bit, and is used to indicate whether the ‘Pcmax State’ field exists. The two ‘R’ fields are the indication field 6, each of which includes 1 bit, and is used to indicate the reserved field.

[0244] In another possible implementation, the first information can include 8 indication fields, which can include the above-mentioned 6 indication fields, and can further include indication field 7 and indication field 8. The indication field 7 is used to indicate the transmission waveform of the first uplink signal, and the indication field 8 is used to indicate the modulation mode of the first uplink signal. The indication field 7 and the indication field 8 can be understood as the second indication field shown in the above.

[0245] Exemplarily, FIG. 13 shows a schematic diagram of another indication field of the first information. As shown in FIG. 13, the first information includes 3 bytes, namely byte 1, byte 2 and byte 3 (Oct 3). Byte 1, byte 2 and byte 3 each include 8 bits. Byte 1 and byte 2 are the same as those shown in FIG. 12, and will not be described herein again.

[0246] Byte 3 can include a ‘T’ field, 3 ‘R’ fields and a ‘Modulation State’ field. The ‘T’ field is indication field 7, including 1 bit, used to indicate the transmission waveform of the first uplink signal. The ‘Modulation State’ field is indication field 8, including 4 bits, used to indicate the modulation mode of the first uplink signal.

[0247] In yet another possible implementation, the first information can include 7 indication fields, which can include the 6 indication fields shown in FIG. 12, and can further include indication field 9 and indication field 10. Indication field 9 is used to indicate the third power of updating the second uplink signal. Indication field 10 is used to indicate whether indication field 9 exists. Indication field 9 can be understood as the third indication field shown above.

[0248] Exemplarily, FIG. 14 shows a schematic diagram of another indication field of the first information. As shown in FIG. 14, the first information includes 3 bytes, namely byte 1, byte 2 and byte 3. Byte 1, byte 2 and byte 3 each include 8 bits. Byte 1 is the same as that shown in FIG. 12, and will not be described herein again. It should be noted that the ‘C0’ field corresponds to the ‘C’ field in FIG. 12, and the ‘Pcmax State0’ field corresponds to the ‘Pcmax State’ field in FIG. 12.

[0249] Byte 3 can include a ‘C1’ field, 2 ‘R’ fields and a ‘Pcmax State1’ field. The ‘Pcmax State1’ field is indication field 9, including 5 bits, used to indicate the third power of updating the second uplink signal. The ‘C1’ field is indication field 10, including 1 bit, used to indicate whether the ‘Pcmax State1’ field exists. The 2 ‘R’ fields are indication field 6, each including 1 bit, used to indicate a reserved field.

[0250] In another possible implementation, the first information can include 11 indication fields, which can include the 7 indication fields shown in FIG. 14, and further include indication field 11, indication field 12, indication field 13, and indication field 14. The indication field 11 is used to indicate the transmission waveform of the first uplink signal. The indication field 12 is used to indicate the modulation mode of the first uplink signal. The indication field 13 is used to indicate the transmission waveform of the second uplink signal. The indication field 14 is used to indicate the modulation mode of the second uplink signal. The indication field 11 and the indication field 12 can be understood as the second indication field shown above, and the indication field 13 and the indication field 14 can be understood as the fourth indication field shown above.

[0251] Exemplarily, FIG. 15 shows a schematic diagram of indication fields of another first information. As shown in FIG. 15, the first information includes 5 bytes, which are byte 1, byte 2, byte 3, byte 4, and byte 5. Each of the byte 1, the byte 2, the byte 3, the byte 4, and the byte 5 includes 8 bits. The byte 1, the byte 2, and the byte 4 are the same as shown in FIG. 14, and will not be described herein again.

[0252] The byte 3 can include a ‘T0’ field, 3 ‘R’ fields, and a ‘Modulation State0’ field. The ‘T0’ field is the indication field 11, includes 1 bit, and is used to indicate the transmission waveform of the first uplink signal. Each of the 3 ‘R’ fields includes 1 bit, and is used to represent a reserved field. The ‘Modulation State0’ field is the indication field 12, includes 4 bits, and is used to indicate the modulation mode of the first uplink signal.

[0253] The byte 5 can include a ‘T1’ field, 3 ‘R’ fields, and a ‘Modulation State1’ field. The ‘T1’ field is the indication field 13, includes 1 bit, and is used to indicate the transmission waveform of the second uplink signal. Each of the 3 ‘R’ fields includes 1 bit, and is used to represent a reserved field. The ‘Modulation State1’ field is the indication field 14, includes 4 bits, and is used to indicate the modulation mode of the second uplink signal.

[0254] In the example shown in FIG. 15, the first uplink signal can correspond to the first TRP, and the second uplink signal can correspond to the second TRP. In other examples, there can be multiple second uplink signals, and the multiple second uplink signals can correspond to multiple TRPs. The first information can include multiple fourth indication fields.

[0255] Exemplarily, FIG. 16 shows a schematic diagram of another indication field of the first information. As shown in FIG. 16, the first information can be used to indicate the updated first power of the first uplink signal, and can also be used to indicate the updated third power of the n second uplink signals. The first information can also be used to indicate the transmission waveform and modulation mode of the first uplink signal, and can also be used to indicate the transmission waveform and modulation mode of each of the n second uplink signals.

[0256] In FIG. 16, the ‘Pcmax State n ’ field includes 5 bits, which are used to indicate the updated third power of the n th second uplink signal. The ‘C n ’ field includes 1 bit, which is used to indicate whether the ‘Pcmax State n ’ field exists. Each of the 2 ‘R’ fields includes 1 bit, which is used to indicate a reserved field. The ‘T n ’ field includes 1 bit, which is used to indicate the transmission waveform of the n th second uplink signal. Each of the 3 ‘R’ fields includes 1 bit, which is used to indicate a reserved field. The ‘Modulation State n ’ field includes 4 bits, which are used to indicate the modulation mode of the n th second uplink signal. Other fields are similar and will not be described here. After the step 1102, the method 1100 can further include that the terminal device sends third information to the network device, and correspondingly, the network device receives the third information, where the third information is used to feed back the difference between the second power and the transmission power of the first uplink signal.

[0257] The second power is the updated maximum transmission power of the terminal device, and the transmission power of the first uplink signal is the power of the uplink signal currently transmitted by the terminal device. In the embodiment of the application, the difference between the second power and the transmission power of the first uplink signal can be referred to as a power headroom (PH), and the first information can be referred to as a power headroom report (PHR), and in other examples, there can be other names, which are not limited in the embodiment of the application.

[0258] The PH can be positive or negative. When the PH is positive, it can represent how much remaining power the terminal device has in addition to the power used by the current transmission signal. When the PH is negative, it can represent that the power used by the current transmission signal has exceeded the maximum transmission power of the terminal device.

[0259] In this way, the terminal device feeds back the difference between the second power and the transmission power of the first uplink signal to the network device, which is beneficial for the network device to issue more reasonable configurations, so that the terminal device can more reasonably perform uplink power control.

[0260] Optionally, before the terminal device sends the third information to the network device, the network device can send information for instructing the terminal device to report the difference to the terminal device; and the terminal device sends the third information to the network device, including the information for instructing the terminal device to report the difference.

[0261] In this way, the terminal device sends the third information when the network device instructs the terminal device to report the difference, which is beneficial to the network device to obtain the required information and improve the system stability.

[0262] In the method shown above, the first information is used to update the first power, the first power is the maximum transmission power of the terminal device, and the first power is related to the modulation mode, the transmission waveform and the MPR of the first uplink signal. If the first power is updated, the updated first power, i.e., the second power, can be greater than the first power. The second power is greater than the first power, the transmission power of the first uplink signal is less than the second power, compared with the scheme that the first power is not updated, the upper limit of the transmission power of the first uplink signal is improved, which can cause the PA of the terminal device to appear nonlinear distortion. In this case, the network device can use the RNC technology to estimate and compensate the nonlinear distortion of the PA, thereby meeting the demodulation requirements.

[0263] The RNC technology will be described below with reference to FIG. 17.

[0264] Exemplarily, FIG. 17 shows a schematic diagram of a communication architecture. As shown in FIG. 17, the terminal device can include a DAC and a PA, one DAC can correspond to multiple PAs, and the multiple PAs are respectively connected with antennas. The network device can include an ADC, an EQ and an RNC module.

[0265] The terminal device can send a reference signal through the DAC and the PA, and the reference signal experiences the same devices as the uplink signal sent by the terminal device. After the reference signal is sent through the PA, the reference signal will have nonlinear distortion. The network device can receive the reference signal with nonlinear distortion, and the network device also has a reference signal without nonlinear distortion, so the network device can calculate the response function of the PA based on the reference signal with nonlinear distortion and the reference signal without nonlinear distortion. The network device can calculate the inverse function of the response function of the PA to obtain the DPD corresponding function, and store the DPD corresponding function in the RNC. The response function of the PA can also be referred to as the nonlinear function of the PA, and the reference signal is used for the network device to train the response function of the PA, which can also be referred to as a training signal, and the embodiments of the present application do not limit this.

[0266] The terminal device can send the uplink signal via the DAC and the PA. After the uplink signal is sent via the PA, the uplink signal can have nonlinear distortion. The network device can receive the uplink signal having the nonlinear distortion. The uplink signal having the nonlinear distortion can reach the RNC module via the ADC and the EQ of the network device. The RNC module of the network device can compensate for the nonlinear distortion of the uplink signal using the DPD corresponding function.

[0267] In this way, the network device can obtain a more accurate uplink signal in the case that the PA of the terminal device has nonlinear distortion, which is beneficial to improving demodulation performance. In addition, the PA of the terminal device has nonlinear distortion, which indicates that the terminal device has a large transmission power, and is beneficial to improving the coverage range of the uplink signal.

[0268] In order to better understand the NRC technology, the embodiments of the present application will be described in conjunction with FIG. 18.

[0269] Exemplarily, FIG. 18 shows a schematic flowchart of a power control method 1800 provided by the embodiments of the present application. The method can be applicable to the communication architecture shown in FIG. 17. As shown in FIG. 18, the method 1800 can include the following steps:

[0270] S1801, the network device configures signaling to the terminal device, and correspondingly, the terminal device receives the configuration signaling. The configuration signaling is used to indicate configuration information of the first uplink signal and the reference signal.

[0271] The first uplink signal can be used to transmit data, and can also be referred to as a data transmission signal.

[0272] In an example, the configuration signaling can be RRC signaling.

[0273] The configuration information of the first uplink signal and the reference signal can be indicated by the same configuration signaling, as shown in S1801, or can be indicated by different configuration information, which is not limited in the embodiments of the present application. If the configuration information of the first uplink signal and the reference signal is indicated by the same configuration signaling, it is beneficial to save signaling overhead.

[0274] The configuration information of the first uplink signal can be the same as or different from the configuration information of the reference signal, which is not limited in the embodiments of the present application. If the configuration information of the first uplink signal is the same as the configuration information of the reference signal, it is simple to implement. If the configuration information of the first uplink signal is different from the configuration information of the reference signal, it has strong flexibility.

[0275] The configuration information of the first uplink signal or the configuration information of the reference signal can include one or more of the following:

[0276] a type of the signal, time-frequency resources carrying the signal, a transmission time of the signal, a transmission period of the signal, a time slot offset of the signal, or an antenna port used for transmitting the signal.

[0277] The type of the signal can be SRS, PRACH, DMS, or PUSCH, etc. The time-frequency resources carrying the signal can include a number of time domain symbols of the signal in time domain resources and a number of REs of the signal in frequency domain resources. The transmission time of the signal can be a certain frame, or a certain time slot in a certain frame, or a certain OFDM symbol of a certain time slot.

[0278] To better understand the configuration information of the first uplink signal and the reference information, the following describes specific examples.

[0279] The reference signal can be a DMRS. The configuration information of the DMRS can include time-frequency resources. The configuration information of the first uplink signal can also include time-frequency resources.

[0280] The time-frequency resources of the DMRS and the time-frequency resources of the first uplink signal can be different. The DMRS can occupy one or more symbols in the time domain. The first uplink signal can occupy one or more symbols in the time domain. The symbol can be an OFDM or DFT-s-OFDM symbol.

[0281] In one example, the DMRS can occupy one symbol in the time domain, and the first uplink signal can occupy multiple symbols in the time domain. FIG. 19 shows a schematic diagram of a time-frequency resource structure. As shown in FIG. 19, the DMRS can occupy two symbols in a time slot and multiple REs in the frequency domain. The first uplink signal can occupy one symbol in a time slot and multiple resource elements (REs) in the frequency domain.

[0282] In one example, the DMRS can occupy multiple symbols in the time domain, and the first uplink signal can occupy multiple symbols in the time domain. FIG. 20 shows a schematic diagram of a time-frequency resource structure. As shown in FIG. 20, the DMRS can occupy two symbols in a time slot and multiple REs in the frequency domain. The first uplink signal can occupy multiple symbols in a time slot and multiple REs in the frequency domain.

[0283] S1802, the network device sends first information to the terminal device, and correspondingly, the terminal device receives the first information. The first information is used to update the first power of the first uplink signal, and the updated first power is the second power.

[0284] This step can refer to S1101 described above, which will not be described here.

[0285] S1803, the network device sends second information to the terminal device, and correspondingly, the terminal device receives the second information. The second information is used to activate a target mode, and the target mode includes determining the transmission power of the first uplink signal based on the second power.

[0286] The field in the second information can be used to activate the target mode, and the specific implementation can refer to Table 2 or Table 3.

[0287] S1804, the terminal device sends a reference signal to the network device, and correspondingly, the network device receives the reference signal.

[0288] The structure of the terminal device can be shown in FIG. 3, or can be shown in FIG. 4, or can be shown in FIG. 17. The terminal device can send the reference signal through the PA.

[0289] The structure of the network device can be shown in FIG. 17. The network device can calculate the response function of the PA based on the received reference signal and the preset reference signal, calculate the inverse function of the response function of the PA, obtain the DPD corresponding function, and store the DPD corresponding function in the RNC.

[0290] S1805, the terminal device sends a first uplink signal to the network device, and correspondingly, the network device receives the first uplink signal.

[0291] The structure of the terminal device can be shown in FIG. 3, or can be shown in FIG. 4, or can be shown in FIG. 17. The terminal device can send the first uplink signal through the PA. The transmission power of the first uplink signal is determined based on the second power.

[0292] The structure of the network device can be shown in FIG. 17. The RNC module in the network device can demodulate the received first uplink signal based on the DPD corresponding function.

[0293] S1806, the network device sends information for indicating reporting PH to the terminal device, and correspondingly, the terminal device receives the information for indicating reporting PH.

[0294] The network device instructs the terminal device to report PH, so as to regulate and control the terminal device, and make the terminal device determine more appropriate transmission power.

[0295] S1807, in response to the information for indicating reporting PH, the terminal device sends PHR to the network device.

[0296] The PHR can refer to the third information.

[0297] S1808, in response to the PHR, the network device can send TPC to the terminal device, and correspondingly, the terminal device receives the TPC.

[0298] The network device can adjust the TPC according to the difference between the second power and the transmission power of the first uplink signal, so that the terminal device adjusts the transmission power of the uplink signal based on the uplink power control technology. For example, the terminal device can adjust the transmission power of the uplink signal by referring to the formula for calculating the power of PUSCH.

[0299] In an example, the TPC can be carried in DCI.

[0300] The power control method provided by the embodiments of the present application can accurately demodulate the signal received by the network device in the presence of nonlinear distortion of the signal transmitted by the terminal device, which is conducive to improving the communication efficiency.

[0301] In the method shown above, the network device can instruct the terminal device to update the maximum transmission power of the terminal device, and such instruction can be periodic or intermittent. As can be known from the method shown in FIG. 18, the terminal device can feed back the PHR to the network device through the third information. The terminal device needs to send the PHR to the network device between two adjacent instructions of the network device, so that the network device can accurately calculate the TPC.

[0302] For example, the maximum transmission power of the terminal device in the time domain resource i is represented by P CMAX (i) and the maximum transmission power of the terminal device in the time domain resource i+1 is represented by P CMAX (i+1). The network device can first instruct the terminal device to update P CMAX (i), and then instruct the terminal device to update P CMAX (i+1). The terminal device needs to report the PHR before the network device instructs the terminal device to update P CMAX (i+1), so that the network device cannot misjudge that the PHR is calculated according to the updated P CMAX (i+1).

[0303] To meet the above requirements, the embodiments of the present application provide a plurality of possible implementation manners.

[0304] In a possible implementation manner, when the network device instructs the terminal device to report the PH, the terminal device reports the PHR, as shown in S1806 and S1807 in FIG. 18.

[0305] In this way, the network device can instruct the terminal device to report the PHR at a suitable time, which is conducive to reducing the probability of misjudgment.

[0306] In another possible implementation, the method further includes: the network device sending fourth information to the terminal device, the fourth information being used to indicate updating the second power; and the fourth information being invalid before the network device receives the PHR, or the fourth information being sent to the terminal device after receiving the PHR.

[0307] The fourth information being invalid before the network device receives the PHR means that the fourth information does not take effect before the network device receives the PHR, and can take effect after the network device receives the PHR. In this way, the terminal device can update the second power based on the fourth information after reporting the PHR.

[0308] In this way, the fourth information is invalid before the PHR is reported, and the PHR and the information indicating updating the power are paired, which is beneficial to reducing the probability of misjudgment and improving system stability.

[0309] The fourth information being sent to the terminal device after receiving the PHR means that the network device sends the fourth information after receiving the PHR. The terminal device can update the second power based on the fourth information.

[0310] Exemplarily, the maximum transmission power of the terminal device in the time domain resource i is represented by P CMAX (i) and the maximum transmission power of the terminal device in the time domain resource i+1 is represented by P CMAX (i+1). The network device can first instruct the terminal device to update P CMAX (i), and then instruct the terminal device to update P CMAX (i+1) after receiving the PHR reported through the third information.

[0311] In this way, the network device instructs the next update after receiving the PHR reported through the third information, which is beneficial to reducing the probability of misjudgment.

[0312] In order to better understand the above method, the embodiments of the present application are described below in combination with specific examples.

[0313] In one example, the first information can be carried in MAC-CE signaling. The MAC-CE signaling is invalid upon receiving, and the time of taking effect can be 3 milliseconds (ms) after the terminal device performs HARQ-ACK feedback. The time of the terminal device reporting the PHR can be after the MAC-CE signaling takes effect.

[0314] Exemplarily, FIG. 21 shows a schematic diagram of a MAC-CE signaling validity time. As shown in FIG. 21, the terminal device receives the MAC-CE in time slot 2, and reports the PHR in time slot x, which is later than 3 ms after the terminal device performs HARQ-ACK feedback. The 3 ms after the terminal device performs HARQ-ACK feedback can be expressed as HARQ-ACK+3 ms.

[0315] In this way, the PHR is received after the MAC-CE signaling takes effect, compared with the PHR received before the MAC-CE signaling takes effect, which is conducive to reducing the probability of misjudgment.

[0316] In this example, in order to make the time of the PHR reported by the terminal device be after the MAC-CE signaling takes effect, the protocol can agree that the PHR is not fed back before the MAC-CE signaling takes effect. In addition, the network device can instruct the terminal device to report the PHR after the MAC-CE signaling takes effect.

[0317] Exemplarily, the network device can instruct the terminal device to report the PH after obtaining the HARQ-ACK.

[0318] In this way, it is conducive to making the network device receive the PHR after the MAC-CE signaling takes effect, and reducing the probability of misjudgment.

[0319] In another example, the first information can be carried in the RCC signaling or the DCI signaling. The time of the PHR reported by the terminal device can be after the RCC signaling or the DCI signaling takes effect.

[0320] It should be noted that the size of the serial number of the above methods does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic.

[0321] The power control method of the embodiments of the present application is described in detail above in combination with FIGS. 11 to 21, and the communication apparatus of the embodiments of the present application is described in detail below in combination with FIGS. 22 to 24. The communication apparatus includes modules or units for executing each part of the above-described embodiments. The modules or units can be software, hardware, or a combination of software and hardware. The communication apparatus is only briefly exemplified below, and for the details of the scheme implementation, reference can be made to the description of the foregoing method embodiments, which will not be described herein again.

[0322] Exemplarily, FIG. 22 is a schematic block diagram of a communication apparatus 2200 provided by an embodiment of the present application. As shown in FIG. 22, the communication apparatus 2200 includes a transceiver module 2210 and a processing module 2220.

[0323] In a possible implementation, the communication apparatus 2200 is configured to implement the steps corresponding to the terminal device in the method 1100.

[0324] The transceiver 2210 is configured to receive first information, the first information being used to update a first power, the first power being a maximum transmit power that can be used when transmitting a first uplink signal; the processing module 2220 is configured to: obtain a second power, the second power being the updated first power; and the transceiver 2210 is further configured to: transmit the first uplink signal, a transmit power of the first uplink signal being determined based on the second power, the second power being the updated first power.

[0325] Optionally, the first information includes a first indication field, the first indication field being used to indicate the second power, or the first indication field being used to indicate a difference between the second power and the first power.

[0326] Optionally, the first information includes a second indication field, the second indication field being used to indicate at least one of a transmission waveform of the first uplink signal or a modulation mode of the first uplink signal.

[0327] Optionally, the first information further includes at least one third indication field, the at least one third indication field being used to indicate updating at least one third power, the third power being a maximum transmit power that can be used when a first communication apparatus transmits a second uplink signal, the first uplink signal corresponding to a first TRP, the second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP; the processing module 2220 is further configured to: obtain at least one fourth power, the at least one fourth power being the updated at least one third power; and the transceiver 2210 is further configured to: transmit the at least one second uplink signal, a transmit power of the at least one second uplink signal being determined based on the at least one fourth power.

[0328] Optionally, the first information further includes at least one fourth indication field, the at least one fourth indication field being used to indicate at least one of a transmission waveform of the at least one second uplink signal or a modulation mode of the at least one second uplink signal.

[0329] Optionally, before transmitting the first uplink signal, the transceiver 2210 is further configured to: receive second information, the second information being used to activate a target mode, the target mode including determining the transmit power of the first uplink signal based on the second power.

[0330] Optionally, an LCID field or an eLCID field in the second information is used to indicate activating the target mode.

[0331] Optionally, the transceiver 2210 is further configured to: transmit third information, the third information including a difference between the second power and the transmit power of the first uplink signal.

[0332] Optionally, before sending the third information, the transceiver module 2210 is further configured to: receive information indicating that the above-mentioned difference should be reported; and send the third information in response to the information indicating that the above-mentioned difference should be reported.

[0333] Optionally, after sending the third information, the transceiver module 2210 is further configured to: receive a fourth information, the fourth information being used to indicate an update of the second power; wherein the fourth information is not effective before sending the third information, or the fourth information is received after sending the third information.

[0334] In another possible implementation, the communication device 2200 is used to implement the steps corresponding to the network device in the method 1100 described above.

[0335] The transceiver module 2210 is used to send first information, which is used to update the first power, which is the maximum transmission power that the terminal device can use when sending the first uplink signal; and to receive the first uplink signal, the transmission power of which is determined based on the second power, which is the updated first power.

[0336] Optionally, the first information includes a first indication field, which is used to indicate the second power, or the first indication field is used to indicate the difference between the second power and the first power.

[0337] Optionally, the first information includes a second indication field, which is used to indicate at least one of the transmission waveform and modulation scheme of the first uplink signal.

[0338] Optionally, the first information further includes at least one third indication field, which is used to indicate an updated third power. The third power is the maximum transmit power that the terminal device can use when transmitting a second uplink signal. The first uplink signal corresponds to a first TRP, and the second uplink signal corresponds to at least one second TRP. The at least one second TRP is different from the first TRP. The transceiver module 2210 is further configured to: receive at least one second uplink signal, the transmit power of which is determined based on at least one fourth power, which is the updated at least one third power.

[0339] Optionally, the first information may further include at least one fourth indication field, which is used to indicate at least one of the transmission waveform and modulation scheme of at least one second uplink signal.

[0340] Optionally, before receiving the first uplink signal, the transceiver module 2210 is further configured to: send second information, the second information being used to activate a target mode, the target mode including determining the transmit power of the first uplink signal based on a second power.

[0341] Optionally, the Logical Channel Identifier (LCID) field or the Extended Logical Channel Identifier (eLCID) field in the second information is used to indicate the activated target mode.

[0342] Optionally, the transceiver module 2210 is further configured to: receive third information, the third information including the difference between the second power and the transmit power of the first uplink signal.

[0343] Optionally, before receiving the third information, the transceiver module 2210 is further configured to: send information indicating that the above-mentioned difference should be reported; and receive the third information, which is used in response to the information indicating that the above-mentioned difference should be reported.

[0344] Optionally, the transceiver module 2210 is further configured to: send a fourth message, the fourth message being used to indicate an update to the second power; wherein the fourth message is not effective before receiving the third message, or the fourth message is sent after receiving the third message.

[0345] Optionally, the first information is carried in the MAC-CE signaling.

[0346] It should be understood that the communication device 2200 here is embodied in the form of a functional module. The term "module" here can refer to application-specific integrated circuits (ASICs), electronic circuits, processors (e.g., shared processors, proprietary processors, or group processors, etc.) and memories for executing one or more software or firmware programs, integrated logic circuits, and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art will understand that the communication device 2200 can specifically be a terminal device or network device as described in the above embodiments. The communication device 2200 can be used to execute the various processes and / or steps corresponding to the terminal device or network device in the above method embodiments; to avoid repetition, these will not be described again here.

[0347] The aforementioned communication device 2200 has the function of implementing the corresponding steps performed by the terminal device or network device in the above method; the above functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In embodiments of this application, the communication device 2200 in FIG22 can also be a chip, such as a System-on-a-Chip (SoC).

[0348] Figure 23 shows a schematic diagram of the structure of the communication device 2300 provided in an embodiment of this application. As shown in Figure 23, the communication device 2300 includes a processor 2301, a transceiver 2302, and a memory 2303. The processor 2301, transceiver 2302, and memory 2303 communicate with each other through an internal connection path. The memory 2303 is used to store instructions, such as computer code, and the processor 2301 is used to execute the instructions stored in the memory 2303 to control the transceiver 2302 to send and / or receive signals.

[0349] It should be understood that the communication device 2300 may specifically be a network device or a terminal device in the above embodiments, and may be used to execute the various steps and / or processes corresponding to the network device or terminal device in the above method embodiments. Optionally, the memory 2303 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 2301 may be used to execute instructions stored in the memory, and when the processor 2301 executes instructions stored in the memory, the processor 2301 is used to execute the various steps and / or processes of the above method embodiments. The transceiver 2302 may include a transmitter 23021, a receiver 23022, and an antenna 23023. The transmitter 23021 may be used to implement the various steps and / or processes corresponding to the transceiver for performing the transmission action. For example, the transmitter 23021 may be used to transmit information to another device through the antenna 23023. Receiver 23022 can be used to implement the various steps and / or processes corresponding to the transceiver described above for performing the receiving action. For example, receiver 23022 can be used to receive information from another device via antenna 23023.

[0350] It should be understood that, in the embodiments of this application, the processor may be a central processing unit (CPU), or it may be other 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, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0351] In implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware processor, or as a combination of hardware and software modules within the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor executes the instructions in the memory, combining them with its hardware to complete the steps of the above method. To avoid repetition, detailed descriptions are omitted here.

[0352] Furthermore, the method provided in the embodiments of this application described above can also be applied to O-RAN systems. In an O-RAN system, the O-RAN device can perform the steps performed by the network device described above.

[0353] The network device in this application embodiment can also be referred to as an access network device. The access network device (i.e., RAN, such as an eNB, gNB, or next-generation access network device) can communicate with the core network (CN) through a backhaul link, or it can communicate with the terminal device through an air interface.

[0354] To better understand O-RAN equipment, the following section introduces the network element function division and protocol layer of O-RAN equipment.

[0355] For example, Figure 24 is a diagram illustrating the network element function division and protocol layer structure of an O-RAN device according to an embodiment of this application. As shown in Figure 24, the CU is a logical node that carries the RRC layer, Service Data Adaptation Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, and other control functions of the access network device. The CU is connected to network nodes such as core network devices through some interfaces, which may be E2 interfaces, etc. Optionally, the CU may have some functions of the core network device. The CU (e.g., PDCP layer and higher layers) is connected to the DU (e.g., RLC layer and lower layers) through some interfaces, which may be F1 interfaces, etc. In some examples, these interfaces (e.g., F1 interfaces) can provide control plane (C-Plane) and user plane (U-Plane) functions, such as interface management, system information management, UE context management, and RRC message transmission. F1AP is the application protocol of the F1 interface, and in some examples, it defines the signaling procedures of F1. The F1 interface supports the control plane F1-C and the user plane F1-U.

[0356] In some examples, the CU can be split into CU-CP (control unit-control plane) and CU-UP (control unit-user plane). CU-CP is a logical node carrying the RRC layer and PDCP-C (control plane part of PDCP) layer, used to implement the CU's control plane functions. CU-CP can interact with network elements in the core network used to implement control plane functions. These network elements in the core network can be access and mobility function (AMF) network elements, such as the access and mobility management function (AMF) in a 5G system. AMF network elements are responsible for mobility management in the mobile network, such as terminal device location updates, terminal device registration with the network, and terminal device handover. CU-UP is a logical node carrying the SDAP layer and PDCP-U (user plane part of PDCP) layer, used to implement the CU's user plane functions. CU-UP can interact with network elements in the core network used to implement user plane functions. These network elements in the core network, such as the UPF (user plane function) in a 5G system, are responsible for data forwarding and receiving in terminal devices. The above CU and DU configurations are merely examples; the functions of the CU and DU can be configured as needed. For instance, the CU or DU can be configured to have more protocol layer functions, or only some protocol layer processing functions. For example, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of the CU or DU can be divided according to service type or other system requirements, such as by latency. Functions that require low latency can be placed in the DU, while functions that do not require low latency can be placed in the CU.

[0357] In some examples, a DU is a logical node that carries the radio link control (RLC) layer, medium access control (MAC) layer, higher physical layer (PHY) layer, and other functions. In some examples, a DU can control at least one RU. The DU connects to the RU through interfaces, which may be fronthaul interfaces. In some examples, the higher PHY layer includes the PHY layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation, and demodulation.

[0358] In some examples, the RU is a logical node carrying both lower physical layer (PHY) and radio frequency (RF) processing, also known as an RF chain. In some examples, the RU can be a 3GPP TRP, a remote radio head (RRH), or other similar entity. In some examples, the low-PHY includes PHY processing functions such as fast Fourier transform (FFT), inverse fast Fourier transform (IFFT), digital beamforming, and filtering. The RU communicates with one or more UEs via a radio link.

[0359] The DU and RU can be co-located or not. The DU and RU exchange control plane and user plane information via a lower-layer split-control, user, and synchronization (LLS-CUS) interface through a fronthaul link. LLS-CUS may include LLS-C and LLS-U interfaces, respectively providing the control plane (C-plane) and user plane (U-plane). In some examples, the control plane (C-plane) refers to real-time control between the DU and RU. The DU and RU exchange management information via an LLS-M interface on the fronthaul link; the management plane (M-plane) refers to non-real-time management operations between the DU and RU.

[0360] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0361] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples.

[0362] In this embodiment of the application, if the CU executes the method provided in this embodiment, the CU can send the first signaling through the RRC layer, and the first signaling can be RCC signaling. If the DU executes the method provided in this embodiment, the DU can send the first signaling through the MAC layer, and the first signaling can be MAC-CE signaling, or it can send the first signaling through the higher physical layer, and the first signaling can be DCI signaling.

[0363] This application also provides a computer-readable storage medium for storing a computer program for implementing the methods shown in the above-described method embodiments.

[0364] This application also provides a computer program product, which includes a computer program (also referred to as code or instructions) that, when run on a computer, allows the computer to perform the methods shown in the above-described method embodiments.

[0365] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0366] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0367] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0368] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0369] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0370] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0371] The above description is merely a specific embodiment of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A power control method, characterized by, The method is applied to a first communication device, and the method comprises: receiving first information, the first information being used to indicate updating a first power, the first power being a maximum transmit power that can be used by the first communication device when transmitting a first uplink signal; obtaining a second power, the second power being the updated first power; transmitting the first uplink signal, a transmit power of the first uplink signal being determined based on the second power.

2. The method of claim 1, wherein, The first information comprises a first indication field, the first indication field being used to indicate the second power, or the first indication field being used to indicate a difference between the second power and the first power.

3. The method according to claim 1 or 2, characterized in that, The first information comprises a second indication field, the second indication field being used to indicate at least one of a transmission waveform and a modulation mode of the first uplink signal.

4. The method according to any one of claims 1 to 3, characterized in that, The first information further comprises at least one third indication field, the at least one third indication field being used to indicate updating at least one third power, the third power being a maximum transmit power that can be used by the first communication device when transmitting a second uplink signal, the first uplink signal corresponding to a first transmission and reception point (TRP), the at least one second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP; The method further comprises: obtaining at least one fourth power, the at least one fourth power being the updated at least one third power; transmitting the at least one second uplink signal, a transmit power of the at least one second uplink signal being determined based on the at least one fourth power.

5. The method of claim 4, wherein, The first information further comprises at least one fourth indication field, the at least one fourth indication field being used to indicate at least one of a transmission waveform and a modulation mode of the at least one second uplink signal.

6. The method according to any one of claims 1 to 5, characterized in that, Before the transmitting the first uplink signal, the method further comprises: receiving second information, the second information being used to activate a target mode, the target mode comprising determining the transmit power of the first uplink signal based on the second power.

7. The method of claim 6, wherein, A logical channel identifier (LCID) field or an extended logical channel identifier (eLCID) field in the second information is used to indicate activating the target mode.

8. The method according to any one of claims 1 to 7, characterized in that, The method further comprises: transmitting third information, the third information comprising a difference between the second power and the transmit power of the first uplink signal.

9. The method of claim 8, wherein, The method further comprises: receiving fourth information, the fourth information being used to indicate updating the second power; wherein the fourth information is not effective before transmitting the third information, or the fourth information is received after transmitting the third information.

10. The method according to any one of claims 1 to 9, characterized in that, The first information is carried in medium access control-control element (MAC-CE) signaling.

11. A power control method, characterized by, The method is applied to a second communication device, and the method comprises: transmitting first information, the first information being used to update a first power, the first power being a maximum transmit power that can be used by a first communication device when transmitting a first uplink signal; receiving the first uplink signal, a transmit power of the first uplink signal being determined based on a second power, the second power being the updated first power.

12. The method of claim 11, wherein, The first information includes a first indication field, and the first indication field is used to indicate the second power, or the first indication field is used to indicate a difference between the second power and the first power.

13. The method according to claim 11 or 12, characterized in that, The first information includes a second indication field, and the second indication field is used to indicate at least one of a transmission waveform and a modulation mode of the first uplink signal.

14. The method according to any one of claims 11 to 13, characterized in that, The first information further includes at least one third indication field, and the at least one third indication field is used to indicate updating at least one third power, the third power being a maximum transmission power that can be used by the first communication device when transmitting a second uplink signal, the first uplink signal corresponding to a first transmission and reception point (TRP), and the second uplink signal corresponding to at least one second TRP, the at least one second TRP being different from the first TRP. The method further includes: receiving at least one second uplink signal, a transmission power of the at least one second uplink signal being determined based on at least one fourth power, the at least one fourth power being the updated at least one third power.

15. The method of claim 14, wherein, The first information further includes at least one fourth indication field, and the at least one fourth indication field is used to indicate at least one of a transmission waveform and a modulation mode of the at least one second uplink signal.

16. The method according to any one of claims 11 to 15, characterized in that, Before the receiving the first uplink signal, the method further includes: transmitting second information, the second information being used to activate a target mode, the target mode including determining a transmission power of the first uplink signal based on the second power.

17. The method of claim 16, wherein, A logical channel identifier (LCID) field or an extended logical channel identifier (eLCID) field in the second information is used to indicate activating the target mode.

18. The method according to any one of claims 11 to 17, characterized in that, The method further includes: receiving third information, the third information including a difference between the second power and the transmission power of the first uplink signal.

19. The method of claim 18, wherein, The method further includes: transmitting fourth information, the fourth information being used to indicate updating the second power; wherein the fourth information is not effective before receiving the third information, or the fourth information is transmitted after receiving the third information.

20. The method of any one of claims 11 to 19, wherein, The first information is carried in medium access control-control element (MAC-CE) signaling.

21. A communications device, characterized by The apparatus includes a module for performing the method of any one of claims 1-10, or a module for performing the method of any one of claims 11-20.

22. A communications device, characterized by The apparatus includes: a processor coupled to a memory, the memory being used to store a computer program, when the processor invokes the computer program, the apparatus performs the method of any one of claims 1-10, or the apparatus performs the method of any one of claims 11-20.

23. A chip, characterized by The apparatus includes: a processor, used to read instructions stored in a memory, when the processor executes the instructions, the chip implements the method of any one of claims 1-10, or the chip implements the method of any one of claims 11-20.

24. A computer-readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium, and when the computer program is run on the computer, causes the method of any one of claims 1-10 to be performed, or causes the method of any one of claims 11-20 to be performed.

25. A computer program product, characterised in that, The computer program product comprises instructions which, when executed, cause the method of any one of claims 1-10 to be performed, or cause the method of any one of claims 11-20 to be performed.

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