Power control method and apparatus

Abstract

Provided in the present application are a power control method and apparatus. In the method, a first apparatus can receive first indication information from a second apparatus, so as to acquire path loss information for calculating a transmission power for sending a first signal (e.g., an uplink signal for sensing), such that the calculation of the first apparatus with regard to the transmission power and / or a power headroom is more accurate, and the first apparatus can flexibly adjust a signal transmission power on the basis of a change in path loss information of a sensing situation, thereby improving the sensing performance.

Description

A power control method and device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 28, 2023, with application number 202311837257.8 and application name “A Power Control Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a power control method and device. Background Art

[0003] In a mobile communication network, path loss compensation for a communication link (from a signal transmitter to a signal receiver) can be performed based on uplink power control technology. For example, based on uplink power control technology, a terminal can send a reference signal to a network device to measure the path loss from the terminal to the network device, so that the terminal device can compensate for the path loss of the signal transmission power. The perception scenario based on integrated communication and perception technology also includes a perception link, which is from the signal transmitter to the environmental scatterer and from the environmental scatterer to the signal receiver. Therefore, in a perception scenario, if the terminal only uses the path loss of the communication link measured based on the reference signal to perform path loss compensation, it may lead to inaccurate transmit power and power margin calculated by the terminal and reduced perception performance. Summary of the Invention

[0004] The present application provides a power control method and device, which can improve the perception performance of a terminal in different perception scenarios.

[0005] In a first aspect, the present application provides a power control method. The method is performed by a first device, or by a component of the first device (e.g., a processor, chip, or chip system), or by a logic module that implements all or part of the functions of the first device. For example, the first device is a terminal. The first device receives first indication information from a second device, where the first indication information is used to indicate a path loss parameter of at least one first device. The at least one first device includes a first terminal, where the path loss parameter includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of a first signal transmitted by the first terminal; the path traversed by the first signal includes a path from the first terminal to the second device through environmental scatterers. The first device sends second indication information to the second device; the second indication information is used to indicate a first power headroom of the first terminal, where the first power headroom is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, where the transmit power of the first signal is determined based on the path loss parameter of the first terminal.

[0006] In this method, the first device can receive the first indication information, thereby obtaining the path loss information used to calculate the transmission power of sending the first signal (for example, the uplink signal used for perception), so that the first device can calculate the transmission power and / or power margin more accurately, which is beneficial for the first device to flexibly adjust the signal transmission power according to the changes in the path loss information of the perception scenario, thereby meeting the perception signal transmission power requirements and improving the perception performance.

[0007] In one possible implementation, the path passed by the first signal includes one or more paths of the first terminal; the first indication information is used to indicate the path loss parameter of a path of the first terminal; or; the first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal.

[0008] In one possible implementation, the multiple path loss parameters corresponding to the multiple paths include a path loss reference value and multiple related values; the first device performs a first operation on the path loss reference value and the multiple related values ​​to determine the multiple path loss parameters of the first terminal.

[0009] In the above method, the first indication information can be used to indicate multiple path loss parameters. For example, the first indication information can carry a path loss reference value and multiple related values, and the rules of the first operation are pre-agreed between the first device and the second device. Then, the first device can determine the multiple path loss parameters of the first terminal through the first operation; for example, the first operation can be basic operations such as addition, subtraction, multiplication, and division, or a variation based on basic operations such as addition, subtraction, multiplication, and division, which is not limited in this application.

[0010] In one possible implementation, the first device determines the maximum values ​​of multiple path loss parameters corresponding to multiple paths of the first terminal; the first device determines the transmission power of the first signal sent by the first terminal based on the maximum value of the path loss parameter.

[0011] In this method, the first device can determine the transmission power of the first signal based on the maximum value of the path loss parameter, so that the transmission power of the first signal sent by the first terminal can be larger, which is conducive to compensating for the path loss of the path passed by the first signal.

[0012] In one possible implementation, the first device determines the path loss parameter associated with the identifier of the first terminal in the first indication information based on the identifier of the first terminal; or; the first device determines the path loss parameter associated with the location information of the first terminal in the first indication information based on the location information of the first terminal.

[0013] In this method, the first device can determine the path loss parameter corresponding to the first terminal from the first indication information (which may include path loss parameters corresponding to multiple terminals) based on the identifier of the first terminal or the location information of the first terminal.

[0014] In one possible implementation, the first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of ​​the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; the first path loss change value is the difference between the first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of the reference signal determined based on the location information of the first terminal.

[0015] In a possible implementation manner, the second indication information is further used to instruct the first device to determine a path loss parameter used by the first power headroom.

[0016] In this method, the first device may also feed back the path loss parameter actually used by the first terminal to the second device, thereby feeding back the perception capability of the first terminal.

[0017] In a second aspect, the present application provides a power control method. The method is performed by a second device, or by a component of the second device (e.g., a processor, chip, or chip system), or by a logic module that implements all or part of the functions of the second device. For example, the second device is a network device (e.g., a base station). The second device sends first indication information to at least one first device, where the first indication information is used to indicate a path loss parameter of the at least one first device. The at least one first device includes a first terminal, where the path loss parameter includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of a first signal transmitted by the first terminal; the path traversed by the first signal includes a path from the first terminal through environmental scatterers to the second device. The second device receives second indication information from the first device, where the second indication information is used to indicate a first power headroom of the first terminal; the first power headroom is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, where the transmit power of the first signal is determined based on the path loss parameter of the first terminal.

[0018] In this method, the second device indicates to the first device the path loss information used to calculate the transmission power for sending the first signal by sending the first indication information, which is beneficial for the first device to flexibly adjust the signal transmission power according to the changes in the path loss information of the perception scene, thereby meeting the perception signal transmission power requirements and improving the perception performance.

[0019] In one possible implementation, the path passed by the first signal includes one or more paths of the first terminal; the first indication information is used to indicate the path loss parameter of a path of the first terminal; or; the first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal.

[0020] In one possible implementation, the multiple path loss parameters corresponding to the multiple paths include a path loss reference value and multiple related values; the path loss reference value and the multiple related values ​​are used by the first device to determine the multiple path loss parameters of the first terminal based on the first operation.

[0021] In the above method, the second device can indicate multiple path loss parameters of the first device. For example, the first indication information can carry a path loss reference value and multiple related values, and the first device and the second device have pre-agreed on the rules of the first operation. Then, the second device indicates the path loss reference value and multiple related values ​​used for the first operation to the first device.

[0022] In one possible implementation, the first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of ​​the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; the first path loss change value is the difference between the first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of the reference signal determined based on the location information of the first terminal.

[0023] In a possible implementation manner, the second indication information is further used to instruct the first device to determine a path loss parameter used by the first power headroom.

[0024] In the above method, the second device receives the path loss parameter actually used by the first terminal fed back by the first device, and the second device can obtain the perception capability of the first terminal.

[0025] In a third aspect, the present application provides a power control method that can be implemented through interaction between a first device and a second device. For example, the first device is a terminal and the second device is a network device. The second device sends first indication information to at least one first device, where the first indication information indicates a path loss parameter of the at least one first device; and the first device receives the first indication information accordingly. The at least one first device includes a first terminal, where the path loss parameter includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of a first signal transmitted by the first terminal; and the path traversed by the first signal includes a path from the first terminal to the second device through environmental scatterers. The first device sends second indication information to the second device, where the second indication information indicates a first power headroom of the first terminal; and the second device receives the second indication information accordingly. The first power headroom is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, where the transmit power of the first signal is determined based on the path loss parameter of the first terminal.

[0026] Optionally, other implementations of the power control method may refer to the corresponding descriptions in the first aspect and the second aspect, and will not be repeated here.

[0027] In a fourth aspect, the present application provides a communication device. The communication device may be a terminal, a device for a terminal, or a device capable of being used in conjunction with a terminal. In one possible implementation, the communication device may include a functional module, which may be implemented as a hardware circuit, software, or a combination of hardware circuit and software.

[0028] In one possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is configured to receive first indication information from a second device, the first indication information being used to indicate a path loss parameter of at least one first device. The at least one first device includes a first terminal, the path loss parameter including at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal in transmitting the first signal; the path traversed by the first signal includes a path from the first terminal through an environmental scatterer to the second device. The communication unit is further configured to send second indication information to the second device; the second indication information is used to indicate a first power margin of the first terminal, the first power margin being the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, the transmit power of the first signal being determined based on the path loss parameter of the first terminal.

[0029] In one possible implementation, the path passed by the first signal includes one or more paths of the first terminal; the first indication information is used to indicate the path loss parameter of a path of the first terminal; or; the first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal.

[0030] In one possible implementation, the multiple path loss parameters corresponding to the multiple paths include a path loss reference value and multiple correlation values. The processing unit is further configured to perform a first operation on the path loss reference value and the multiple correlation values ​​to determine the multiple path loss parameters of the first terminal.

[0031] In one possible implementation, the processing unit is further configured to determine a maximum value of multiple path loss parameters corresponding to multiple paths of the first terminal, and to determine a transmit power for the first terminal to send the first signal based on the maximum value of the path loss parameter.

[0032] In one possible implementation, the processing unit is further configured to determine, based on the identifier of the first terminal, a path loss parameter associated with the identifier of the first terminal in the first indication information. Alternatively, the processing unit is further configured to determine, based on the location information of the first terminal, the path loss parameter associated with the location information of the first terminal in the first indication information.

[0033] In one possible implementation, the first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of ​​the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; the first path loss change value is the difference between the first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of the reference signal determined based on the location information of the first terminal.

[0034] In a possible implementation manner, the second indication information is further used to instruct the first device to determine a path loss parameter used by the first power headroom.

[0035] In a fifth aspect, the present application provides a communication device. The communication device may be a network device, a device of a network device, or a device capable of being used in conjunction with a network device. In one possible implementation, the communication device may include a functional module, which may be implemented as a hardware circuit, software, or a combination of hardware circuit and software.

[0036] In one possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is used to send first indication information to at least one first device, and the first indication information is used to indicate a path loss parameter of the at least one first device. The at least one first device includes a first terminal, and the path loss parameter includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal sending the first signal; the path passed by the first signal includes a path from the first terminal to the second device through an environmental scatterer. The communication unit is also used to receive second indication information from the first device; the second indication information is used to indicate a first power margin of the first terminal, and the first power margin is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, and the transmit power of the first signal is determined based on the path loss parameter of the first terminal.

[0037] In one possible implementation, the path passed by the first signal includes one or more paths of the first terminal; the first indication information is used to indicate the path loss parameter of a path of the first terminal; or; the first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal.

[0038] In one possible implementation, the multiple path loss parameters corresponding to the multiple paths include a path loss reference value and multiple related values; the path loss reference value and the multiple related values ​​are used by the first device to determine the multiple path loss parameters of the first terminal based on the first operation.

[0039] In one possible implementation, the first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of ​​the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; the first path loss change value is the difference between the first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of the reference signal determined based on the location information of the first terminal.

[0040] In a possible implementation manner, the second indication information is further used to instruct the first device to determine a path loss parameter used by the first power headroom.

[0041] For the third and fourth aspects, as an example, the processing unit may be a processor, and the communication unit may be a transceiver unit, a transceiver, or a communication interface. It is understood that when the communication device is a communication device (such as a terminal or a network device), the communication unit may be a transceiver in the communication device (for example, a transceiver includes a transmitter and a receiver), for example, implemented by an antenna, a feeder, and a codec in the communication device, or, if the communication device is a chip provided in the device, the processing unit may be a processing circuit, a logic circuit, etc. of the chip, and the communication unit may be an input / output interface of the chip, such as an input / output circuit, a pin, etc.

[0042] In a sixth aspect, the present application provides a communication device, comprising: a processor configured to execute instructions; optionally, the communication device further comprising a memory configured to store the instructions, wherein when the instructions are executed by the processor, the communication device implements at least one of the following: the method according to the first aspect and any possible implementation of the first aspect, and the method according to the second aspect and any possible implementation of the second aspect. Optionally, the processor and the memory are coupled.

[0043] In the seventh aspect, the present application provides a computer-readable storage medium, which stores instructions. When the instructions are executed on a computer, the computer executes at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect.

[0044] In an eighth aspect, the present application provides a chip system. The chip system includes a processor and an interface. Optionally, it may also include a memory for implementing at least one of the following: the method in the first aspect and any possible implementation of the first aspect, and the method in the second aspect and any possible implementation of the second aspect. The chip system may be composed of a chip, or may include a chip and other discrete components.

[0045] In a ninth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, cause the computer to execute at least one of the following: the method of the first aspect and any possible implementation of the first aspect, the method of the second aspect and any possible implementation of the second aspect.

[0046] In the tenth aspect, the present application provides a communication system, which includes at least one device or equipment among the fourth to sixth aspects above, so that the at least one device or equipment above performs at least one of the following: the method in the first aspect and any possible implementation of the first aspect, the method in the second aspect and any possible implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a schematic diagram of a perception mode in a perception scene;

[0048] FIG2 is a schematic diagram of a power margin;

[0049] FIG3 is a schematic diagram of the architecture of a communication system provided by the present application;

[0050] FIG4 is a schematic flow chart of a power control method provided by the present application;

[0051] FIG5 is a schematic diagram of the positions of a network device, an environmental scatterer, and a first terminal provided by the present application;

[0052] FIG6 is a flow chart of another power control method provided by the present application;

[0053] FIG7 is a schematic diagram of a communication device provided by the present application;

[0054] FIG8 is a schematic diagram of another communication device provided in this application. DETAILED DESCRIPTION

[0055] In this application, "this" can indicate an "or" relationship between related objects. For example, A / B can mean either A or B. "And / or" can be used to describe three relationships between related objects. For example, "A and / or B" can mean: A exists alone, A and B exists simultaneously, or B exists alone. A and B can be singular or plural. To facilitate the description of the technical solutions of this application, terms such as "first" and "second" may be used to distinguish between technical features with the same or similar functions. Terms such as "first" and "second" do not limit the quantity or order of execution, and terms such as "first" and "second" do not necessarily indicate differences. In this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. The use of terms such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for easier understanding.

[0056] The technical solution of this application will be described below in conjunction with the accompanying drawings of this application.

[0057] 1. For ease of understanding, the following is a detailed introduction to the definitions of relevant terms involved in this application:

[0058] 1. Integrated sensing and communications (ISAC) technology: is a new information processing technology that combines communication technology and perception technology. Its core idea is to add new perception capabilities to mobile communication networks, build the ability to detect, track and image environmental scatterers, so that the two capabilities of communication and perception are integrated into the same network. Through ISAC technology, functions such as high-precision positioning, environmental perception, perception-assisted communication and improved frequency utilization can be achieved. Among them, environmental scatterers refer to various tangible objects in the environment that can reflect electromagnetic waves, such as mountains, forests or buildings, and can also include movable objects such as vehicles, drones, pedestrians, and terminal devices. Optionally, environmental scatterers can also be called perceived targets, detected targets, perceived objects, detected objects or perceived devices, etc., which are not limited in this application.

[0059] The principle of communication is that the transmitter modulates information onto radio waves and transmits them to the receiver, which then demodulates the signal carried on the radio waves to obtain the information. For example, a terminal sends an uplink signal to a network device, which in turn receives and demodulates it to obtain the information contained therein. The principle of perception, on the other hand, requires the transmitter to send radio waves in a specific direction. When these waves strike the surface of an ambient scatterer, they form reflected waves. The receiver can then receive and process these reflected waves to obtain information such as the location, speed, and type of the ambient scatterer. For example, a terminal sends an uplink signal to a network device, which then strikes the surface of a car, forming a reflected wave. The network device then receives and processes these reflected waves to obtain information such as the car's location and speed.

[0060] Figure 1 is a schematic diagram of a perception pattern in a perception scenario. As shown in Figure 1, the perception scenario includes six sub-scenarios: (1) a sub-scenario in which a network device sends and receives signals independently; (2) a sub-scenario in which network device A sends and network device B receives signals; (3) a sub-scenario in which a network device sends and a terminal receives signals; (4) a sub-scenario in which terminal C sends and receives signals independently; (5) a sub-scenario in which terminal A sends and the network device receives signals; and (6) a sub-scenario in which terminal A sends and terminal B receives signals. It is understood that sub-scenarios (1)-(3) in Figure 1 can be considered as downlink transmission scenarios in which a network device sends downlink signals, and sub-scenarios (4)-(6) can be considered as uplink transmission scenarios in which a terminal sends uplink signals.

[0061] Among them, the sensing mode is divided into single-station sensing and dual-station sensing. Single-station sensing means that the transmitter and receiver of the sensing signal are the same device. From the perspective of the sensing signal process, the sensing station must not only send the sensing signal but also receive the signal reflected by the sensing signal on the surface of the environmental scatterer. For example, as shown in sub-scenario (4) in Figure 1, terminal C sends the sensing signal, and the sensing signal forms a reflection signal on the surface of the environmental scatterer (such as a car), and terminal C then receives the reflection signal. Therefore, the single-station sensing mode is also called the self-transmitting and self-receiving mode. Dual-station sensing means that the transmitter and receiver of the sensing signal are two different devices. From the perspective of the sensing signal process, after the sensing station A sends the sensing signal, the sensing signal is reflected on the surface of the environmental scatterer to generate a reflection signal, and the sensing station B receives the reflection signal. For example, as shown in sub-scenario (5) or sub-scenario (6) in Figure 1, terminal A sends the sensing signal, and the sensing signal forms a reflection signal on the surface of the environmental scatterer (such as a car), and the network device or terminal B receives the reflection signal. Therefore, the dual-station sensing mode is also called the A-transmitting and B-receiving mode. Among them, the communication method of the present application is mainly applicable to sub-scenes (4), (5) and (6) of Figure 1.

[0062] 2. Uplink power control: While ensuring each terminal's transmission performance (including rate, bit error rate, and latency), it also maximizes system throughput and minimizes terminal power consumption. Uplink power control essentially changes the terminal's transmit power and adjusts the number of resource blocks, enabling the terminal to transmit at an appropriate and low power level. Under varying path loss, noise, and interference conditions, the network equipment side consistently achieves an appropriate signal-to-noise ratio, thereby ensuring uplink demodulation performance.

[0063] Uplink power control is categorized into open-loop and closed-loop. In open-loop control, the terminal determines its transmit power using an algorithm whose inputs include internal terminal settings or measurement data. In closed-loop control, the network device sends power control commands to the terminal based on the received signal strength. The terminal then adjusts power based on feedback from the network device.

[0064] For example, assuming that the terminal sends a sounding reference signal (SRS) to the network device, for closed-loop power control, the uplink power control process can be: the network device receives the SRS sent by the terminal, the network device configures its expected physical uplink shared channel (PUSCH) receive power and power control parameters to the terminal, and the terminal calculates a transmit power based on its own estimated path loss, and determines the final transmit power under the constraint of the maximum transmit power.

[0065] For SRS power control, the SRS transmission power PSRS,b,f,c (i,q s ,l) satisfies formula (1):

[0066] Where c indicates that the terminal is in the serving cell c, f indicates the carrier frequency of the terminal, b indicates that the terminal is located in the uplink bandwidth part (UL BWP) b, i indicates the SRS transmission opportunity, and l indicates the power control adjustment state index configured by the higher layer. s The index identifier (identity document, ID) of the resource set of the current SRS. SRS,b,f,c (i,q s ,l) represents the transmission power of the signal, P CMAX,f,c (i) represents the maximum transmit power of the terminal, P OSRS,b,f,c (q s ) represents the transmission power of the signal that the network device expects to receive, M SRS,b,f,c (i) represents the number of resource blocks (RBs) of the SRS bandwidth at transmission opportunity i. SRS,b,f,c (q s ) represents the path loss compensation factor, which is the path loss compensation coefficient of the uplink power control configured by the higher layer; hb,f,c(i,l) represents the power adjustment amount, PL b,f,c (q d ) represents the index q of the terminal based on the downlink reference signal d Measured downlink path loss.

[0067] 3. Power headroom (PH): PH represents the difference between the maximum transmit power of the terminal and the transmit power of the signal. When the terminal performs uplink transmission, in addition to completing the uplink power control of the physical layer, it is also necessary to send the PH of the terminal to the network device through a power headroom report (PHR). For example, Figure 2 is a schematic diagram of a power headroom. As shown in Figure 2, the terminal reports the PH through the media access control layer control element (MAC CE) information. When the PH is a positive value, it means that in addition to the power used for the current transmission signal, the terminal has remaining power to use. For example, assuming that the maximum transmit power of the terminal is 23 decibels (dB) and the transmit power of the signal is 15dB, after the terminal sends the signal, the remaining power is 8dB (ie, the PH is 8dB). When the PH is a negative value, it means that the currently calculated signal transmit power has exceeded the maximum transmit power allowed by the terminal. For example, if the maximum transmit power of the terminal is 23dB and the transmit power of the signal is 30dB, the transmit power of the signal has exceeded the maximum transmit power allowed by the terminal, and the PH is -7dB.

[0068] For example, the power margin PH of SRS type3,b,f,c (i,q s ) satisfies formula (2):

[0069] The meanings of the various parameters in formula (2) can be referred to the corresponding descriptions in formula (1), which will not be repeated here.

[0070] 4. Path loss: The path loss can be calculated by modifying the existing path loss formula defined by the 3rd Generation Partnership Project (3GPP). For example, the path loss PL from the signal transmitter to the signal receiver is: s Satisfying formula (3):

[0071] Where d1 is the distance from the signal transmitter to the ambient scatterer, and d2 is the distance from the ambient scatterer to the signal receiver. PL(d1) is the path loss from the signal transmitter to the ambient scatterer, and PL(d2) is the path loss from the ambient scatterer to the signal receiver. λ is the wavelength of the signal, and RCS represents the radar cross section (RCS) area of ​​the ambient scatterer.

[0072] Among them, PL(d1) and PL(d2) satisfy formula (4): PL=28+22log10 d+20log 10 f (4)

[0073] Wherein, PL is PL(d1) or PL(d2); d represents the distance, which is determined based on the position information of the signal transmitter, the position information of the environmental scatterers, or the position information of the signal receiver, d is d1 or d2, and f represents the carrier frequency of the signal transmitter.

[0074] 2. The communication method provided by this application is described below.

[0075] 1. Communication system:

[0076] The communication method provided in this application can be applied to a variety of communication systems, for example, it can be: 5G (or called new radio (NR)) communication system, it can also be a transition system between the LTE communication system and the 5G communication system, the transition system can also be called a 4.5G communication system, and of course it can also be a future communication system, such as the sixth generation (6G) or even the seventh generation (7G) system. The network architecture and business scenarios described in this application are intended to more clearly illustrate the technical solutions of this application and do not constitute a limitation on the technical solutions provided in this application. It is known to those skilled in the art that with the evolution of the communication network architecture and the emergence of new business scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0077] Figure 3 is a schematic diagram of the architecture of a communication system provided by the present application. The communication system may include a network device 31, at least one environmental scatterer (such as 32a, 32b, 32c, 32d, and 32e in Figure 3), and at least one terminal (such as 33a, 33b, 33c, 33d, and 33e in Figure 3). Figure 1 is only an example. The network device and terminal in the communication system may also be other devices, such as a wireless relay device and a wireless backhaul device, and the terminal may also be an Internet of Things device and a surveillance camera.

[0078] The terminal is used to send uplink signals to network devices or receive downlink signals from network devices. The terminal may have radar sensing functions, such as signal transmission and reception, and signal processing.

[0079] The terminals provided herein may be fixed devices, mobile devices, handheld devices (e.g., mobile phones), wearable devices, vehicle-mounted devices, or wireless devices built into the above devices (e.g., communication modules, modems, or chip systems, etc.). Terminals include, but are not limited to, user equipment (UE), mobile stations, or mobile terminals. Terminals can be widely used for communication in various scenarios. For example, these technologies are being used in scenarios such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communications (mMTC), cellular communications, device-to-device (D2D) communications, vehicle-to-everything (V2X) communications, machine-to-machine / machine-type communications (M2M / MTC) communications, the Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, drones, and robots. For example, a terminal may be a mobile phone (such as mobile phones 33a, 33b, 33c, 33d, and 33e in Figure 3), a handheld terminal in cellular communication, a communication device in D2D, an IoT device in MTC, a surveillance camera in smart transportation and smart cities, or a communication device on a drone. A terminal may be referred to as a user terminal, user device, user unit, user station, terminal, access terminal, access station, UE station, remote station, mobile device, or wireless communication device. This application does not limit the specific technology and specific device form used by the terminal.

[0080] The network device 31 is used to receive uplink signals from a terminal or send downlink signals to a terminal. The network device 31 may have radar sensing functions, such as signal transmission and reception, and signal processing.

[0081] The network device 31 provided in the present application may be an access network device, such as a base station, a Node B, an evolved Node B (eNodeB or eNB), a transmission reception point (TRP), a next generation Node B (gNB) in a fifth generation (5G) mobile communication system, an access network device in an open radio access network (O-RAN or open RAN), a next generation base station in a sixth generation (6G) mobile communication system, or a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system. Alternatively, the network device may be a module or unit that performs part of the functions of a base station, for example, a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU-CP) module, or a centralized unit user plane (CU-UP) module.

[0082] The aforementioned environmental scatterers (32a, 32b, 32c, 32d, and 32e in FIG3 ) may be objects without communication capabilities. As shown in FIG3 , the environmental scatterers may specifically include environmental scatterers 32a, 32b, 32c, 32d, and 32e. Environmental scatterers include, but are not limited to, cars, low-altitude drones, pedestrians, trees, houses, and animals. For example, in an intelligent transportation scenario, environmental scatterers may include cars, pedestrians, trees along the road, or animals.

[0083] As shown in Figure 3, for different numbers of terminals and numbers of environmental scatterers, this application may have the following communication perception integration scenarios:

[0084] (1) Scenario 1: Assuming that there are a network device 31, an environmental scatterer 32a, and a terminal 33a, the possible sensing path between the terminal 33a and the network device 31 is from the terminal 33a to the network device 31 through the environmental scatterer 32a.

[0085] (2) Scenario 2: Assuming that there are network device 31, environmental scatterers 32b, environmental scatterers 32c, and terminal 33c, there may be multiple sensing paths between terminal 33c and network device 31. For example, multiple sensing paths may be formed from terminal 33c to network device 31 through different environmental scatterers, such as terminal 33c-environmental scatterers 32b-network device 31, or terminal 33c-environmental scatterers 32c-network device 31.

[0086] (3) Scenario 3: Assuming that there are network device 31, environmental scatterer 32d, environmental scatterer 32e, terminal 33d, and terminal 33e, there may be multiple perception paths between the terminal and the network device. For example, multiple perception paths are formed from terminal 33d to network device 31 through different environmental scatterers, such as terminal 33d - environmental scatterer 32d - network device 31, or terminal 33d - environmental scatterer 32e - network device 31. Multiple perception paths are formed from terminal 33e to network device 31 through different environmental scatterers, such as terminal 33e - environmental scatterer 32d - network device 31, or terminal 33e - environmental scatterer 32e - network device 31.

[0087] Optionally, for the same ambient scatterer, the RCS used to calculate path loss can vary significantly as the ambient scatterer moves. For example, RCS is significantly affected by the signal's incident angle and the material of the ambient scatterer's reflective surface. Multiple sensing paths may exist for the same ambient scatterer.

[0088] For example, in the communication system shown in Figure 3, the terminal can measure the path loss from the terminal to the network device based on sending SRS to the network device, so that the terminal performs path loss compensation for the one-way communication path (i.e., from the transmitting end to the receiving end), but the transmission power calculated by the terminal ignores the influence of environmental scatterers. Then for the communication and perception integration scenario, the path loss compensation of the one-way communication path cannot meet the path loss compensation of the perception scenario, that is, the terminal cannot flexibly adjust the signal transmission power according to the change of the path loss information of the perception scenario, which leads to the problem of inaccurate transmission power and power margin calculated by the terminal and reduced perception performance. Therefore, the present application provides a power control method, which can enable the terminal to adjust the signal transmission power according to the path loss information indicated by the network device in different perception scenarios, thereby improving the perception performance of the terminal.

[0089] 2. Communication method provided by this application:

[0090] For example, FIG4 is a flow chart of a power control method provided by the present application. The method can be implemented by interaction between a first device and a second device. For example, the first device is a terminal and the second device is a network device. The method includes but is not limited to the following steps:

[0091] S101, the second device sends first indication information; correspondingly, the first device receives the first indication information.

[0092] The first indication information is used to indicate a path loss parameter of at least one first device; the at least one first device includes a first terminal. For example, the first indication information may directly carry the path loss parameter of the at least one first device, or indicate the path loss parameter of the at least one first device through different bit values.

[0093] The first indication information is used to indicate a path loss parameter of the first terminal, and the path loss parameter of the first terminal includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal. For example, the first indication information is used to indicate the first path loss value of the first terminal; or the first indication information is used to indicate the first path loss change value of the first terminal; or the first indication information is used to indicate both the first path loss value and the first path loss change value of the first terminal.

[0094] Optionally, the first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of ​​the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal. For example, Figure 5 is a schematic diagram of the locations of a network device, an environmental scatterer, and a first terminal provided in this application. The network device can calculate the default path loss based on the current cell coverage and the expected perception range of the first terminal. Assuming that the distance between the first terminal and the network device is 500 meters, the distance between the environmental scatterer and the first terminal is d1 (100 meters), and the distance between the environmental scatterer and the network device is d2, the network device configures the expected perception range of the first terminal to be 100 meters. As shown in Figure 5, based on the above formulas (3) and (4), this application assumes that the network device calculates the first path loss value of the first terminal based on two position relationships:

[0095] (1) Position relationship 1: Assume that the distance d2 between the environmental scatterer and the network device is the same as the distance between the first terminal and the network device, that is, d1 = 100 meters (m), d2 = 500m, and assume RCS = 0.01m 2 , f = 4.9 GHz, the default path loss calculated based on formula (3) and formula (4) is 171.7 dB.

[0096] (2) Position relationship 2: Assume that the first terminal, the environmental scatterers and the network equipment are in a straight line, that is, d1 = 100m, d2 = 600m, and the default path loss calculated based on formula (3) and formula (4) is 173.4dB. For another example, assume that RCS = 0.01m 2, f = 26 GHz. Based on the above calculation method, the default path loss for position relationship 1 is 186.2 dB, and the default path loss for position relationship 2 is 187.9 dB. Optionally, the network device detects the location information of the first terminal and the location information of the ambient scatterers, and substitutes the acquired information into formulas (3) and (4), so that the network device can determine the path loss configured for the first terminal.

[0097] Optionally, when the second device does not obtain the location information of any environmental scatterer or the location information of the first terminal, the second device sends a predetermined default path loss to the first terminal. After the second device detects the location information of the environmental scatterer and the first terminal, the second device determines the path loss parameter configured for the first terminal in the first indication information based on the location information of the first terminal, the carrier frequency of the first signal, the location information of the environmental scatterer, and the area of ​​the radar scattering surface. For example, the network device detects the location of the first terminal and the environmental scatterer, assuming that the distance d1 from the first terminal to the environmental scatterer is 100m, the distance d2 from the environmental scatterer to the network device is 200m, and the area of ​​the radar scattering surface of the environmental scatterer RCS = 0.01m 2 , the carrier frequency f of the first terminal is 20 GHz, so the network device can determine the path loss parameter that needs to be configured for the first terminal based on formula (3) and formula (4).

[0098] Among them, the first path loss change value is the difference between the first measurement value and the first path loss value. The first path loss value is determined by the second device based on information such as the location information of the environmental scatterers and the location information of the first device. Optionally, the first measurement value may be the path loss value of the reference signal directly reaching the first device, calculated by the second device based on the location information of the first terminal. For example, the base station may calculate the path loss value of the direct path (not passing through the environmental scatterers) of the reference signal (such as the downlink reference signal preset by the base station for measurement) sent by the base station to the first terminal based on the location information of the first terminal as the first measurement value. Optionally, the first measurement value may be indicated by the second device to the first device. For example, the base station may send the first measurement value to the first terminal, so that when the first terminal calculates the first path loss value that needs to be compensated, it determines the first path loss value based on the first measurement value indicated by the base station and the first path loss change value.

[0099] The first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal for transmitting the first signal. For example, the path loss parameter of the first terminal in the first indication information includes the first path loss value of 2dB for the first terminal, so that the second device instructs the first device to compensate for the path loss of the first terminal for transmitting the first signal by 2dB. Optionally, the first signal is at least one of a sounding reference signal, a signal transmitted on a physical uplink shared channel, a physical uplink control channel, and a physical random access channel, or a perception signal.

[0100] Optionally, the first indication information can be used to indicate a path loss value or a range of path loss values.

[0101] For example, assuming that the first indication information is used to indicate a path loss value, the first indication information may include 8 bits of information, which corresponds to a total of 256 states, and each state directly corresponds to a path loss value, as shown in Table 1:

[0102] Table 1 Correspondence between the first indication information and the path loss value

[0103] It should be noted that the corresponding relationship in Table 1 is predefined, and the value of the first indication information has no direct relationship with the value of the path loss. That is, the value 00000000 on the left can correspond to any PL value, and the one in the table is just an example.

[0104] For another example, assuming that the first indication information is used to indicate a range of path loss values, that is, each state of the first indication information corresponds to an indication range in which the path loss value is located. The first indication information may include 6 bits of information, corresponding to a total of 64 states, each state directly corresponding to a range of path loss values, as shown in Table 2:

[0105] Table 2 Correspondence between the first indication information and the path loss value range

[0106] It should be noted that the correspondence in Table 2 is predefined, and the value of the first indication information has no direct relationship to the indicated range of the path loss value. Optionally, when the first indication information sent by the second device indicates a range of path loss values, the first device uses the middle value of the range to calculate the transmit power for sending the first signal. For example, if the range of path loss values ​​is greater than or equal to 52dB and less than 54dB, the middle value of the range is 53dB, and the first device can use this middle value of 53dB to calculate the transmit power for sending the first signal.

[0107] Optionally, the first indication information may be used to indicate a path loss change value or a range of a path loss change value.

[0108] For example, assuming that the first indication information is used to indicate a path loss change value, the first indication information may include 6 bits of information, which corresponds to a total of 64 states, and each state directly corresponds to a path loss change value, as shown in Table 3:

[0109] Table 3 Correspondence between the first indication information and the path loss change value

[0110] It should be noted that the corresponding relationship in Table 3 is predefined, and the value of the first indication information has no direct relationship with the value of the path loss change value. That is, the value of 000000 on the left can correspond to any ΔPL value, and the one in the table is just an example.

[0111] For example, assuming that the first indication information is used to indicate a range of a path loss change value, that is, each state of the first indication information corresponds to an indication range in which the path loss change value is located. The first indication information may include 6 bits of information, corresponding to a total of 64 states, each state directly corresponding to a range of a path loss change value, as shown in Table 4:

[0112] Table 4 Correspondence between the first indication information and the path loss change value range

[0113] It should be noted that the correspondence in Table 4 is predefined, and the value of the first indication information has no direct relationship with the indication range of the path loss change value. Optionally, when the first indication information sent by the second device is used to indicate the range of the path loss change value, the first device uses the middle value of the range to calculate the transmit power for sending the first signal. For example, if the range of the path loss change value is greater than or equal to -31dB and less than -30dB, the middle value of the range is -30.5dB, so that the first device can use this middle value -30.5dB to calculate the transmit power for sending the first signal.

[0114] Optionally, the first indication information may be carried in at least one of radio resource control (RRC), downlink control information (DCI) or MAC CE information.

[0115] The path through which the first signal passes includes the path from the first terminal to the second device through the environmental scatterer. For example, when the power control method provided in the present application is applied to sub-scenario (4) or sub-scenario (6) in FIG1 , the path through which the first signal sent by the first device (for example, terminal C in sub-scenario (4) or terminal A in sub-scenario (6)) passes includes the path from terminal C to terminal C through the environmental scatterer, or the path from terminal A to terminal B through the environmental scatterer. For another example, when the power control method provided in the present application is applied to the scenario described in sub-scenario (5) in FIG1 with dual-station perception and terminal A sending and network equipment receiving, the path through which the first signal sent by the first device (for example, terminal A in sub-scenario (5)) passes includes the path from terminal A to the network equipment through the environmental scatterer.

[0116] Optionally, the path traversed by the first signal includes one or more paths of the first terminal. For example, assuming that the second device receives an uplink signal sent by the first terminal, the uplink signal passes through an environmental scatterer 1, and the uplink signal is reflected by the environmental scatterer 1 and transmitted to the second device via a path, then the path traversed by the first terminal in sending the first signal is from the first terminal through the environmental scatterer 1 to the second device, and the first indication information is used to indicate a path loss parameter of the path.

[0117] Optionally, the first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal, and the multiple paths of the first terminal include multiple paths from the first terminal to the second device through multiple environmental scatterers. For example, assume that the second device receives an uplink signal sent by the first terminal, and the uplink signal passes through environmental scatterer 1 and environmental scatterer 2, and the uplink signal is reflected by environmental scatterer 1 and environmental scatterer 2 and transmitted to the second device through two paths. The two paths through which the first terminal sends the first signal are from the first terminal to the second device through environmental scatterer 1, and from the first terminal to the second device through environmental scatterer 2. The first indication information is used to indicate the path loss parameters corresponding to the two paths.

[0118] Optionally, the multiple paths of the first terminal include multiple paths from the first terminal to the second device through the first environmental scatterer. For example, assuming that the first environmental scatterer is a low-altitude drone or a car, the path through which the first terminal sends the first signal is from the first terminal to the second device through the low-altitude drone or car. The RCS used for calculating the path loss value will change due to the constant movement of the low-altitude drone, or due to changes in scattering from the front or rear of the car. Therefore, there will be different path loss values ​​through the first environmental scatterer, and thus there will be multiple paths from the first terminal to the second device through the first environmental scatterer. Correspondingly, the first indication information is used to indicate the path loss parameters corresponding to the multiple paths.

[0119] Optionally, assuming that at least one first device includes a first terminal and a second terminal, the first indication information is used to indicate the path loss parameters of the first terminal and the second terminal respectively. The path loss parameter of the first terminal includes at least one of the first path loss value of the first terminal or the first path loss change value of the first terminal; the path loss parameter of the second terminal includes at least one of the second path loss value of the second terminal or the second path loss change value of the second terminal. For example, the second device sends a first indication information to the first terminal and the second terminal, and the first indication information includes the first path loss value of 15dB for the first terminal and the second path loss value of 10dB for the second terminal, so that the second device instructs the first terminal and the second terminal to compensate for the path losses of the first terminal and the second terminal in sending the first signal respectively. Optionally, the specific implementation method of the path loss parameter of the second terminal can refer to the description of the path loss parameter of the first terminal, which will not be repeated here.

[0120] S102, the first device sends second indication information; correspondingly, the second device receives the second indication information.

[0121] The second indication information is used to indicate the first power headroom of the first terminal. The second indication information may directly carry the power headroom of the first terminal, for example, the second indication information includes the first power headroom of the first terminal; or the second indication information indicates the power headroom of the first terminal through values ​​of different bits, so that the first device indicates the remaining power of the first device to the second device.

[0122] The first power headroom is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal. For example, assuming the maximum transmit power of the first terminal is 30 dB, and assuming the first device calculates that the transmit power of the first signal is 12 dB, the first device can determine that the first power headroom of the first terminal is 18 dB.

[0123] The transmit power of the first signal is determined based on a path loss parameter of the first terminal, where the path loss parameter of the first terminal is at least one of a first path loss value of the first terminal and a first path loss change value of the first terminal.

[0124] (1) Case 1: When the path loss parameter of the first terminal is the first path loss value of the first terminal, the transmission power P of the first signal SRS,b,f,c (i,q s ,l) satisfies formula (5):

[0125] Among them, P OSRS,b,f,c (q s ) represents the transmission power of the first signal that the second device expects to receive, PL b,f,cThe specific meanings of other parameters in formula (5) can be referred to the corresponding description of formula (1) above, and will not be repeated here.

[0126] Based on the above formula (5), the first power headroom can be determined. For example, the first power headroom PH type3,b,f,c (i,q s ) satisfies formula (6):

[0127] Among them, PH type3,b,f,c (i,q s ) represents the first power headroom of the first terminal. The specific meanings of other parameters in formula (6) can be referred to the corresponding descriptions of formula (1) and formula (5) above, and will not be repeated here.

[0128] (2) Case 2: When the path loss parameter of the first terminal is the first path loss change value of the first terminal, the transmission power P of the first signal SRs,b,f,c (i,q s ,l) satisfies formula (7):

[0129] Wherein, ΔPL represents the first path loss change value. The specific meanings of other parameters in formula (7) can be referred to the corresponding description of formula (1) above, and will not be repeated here.

[0130] Based on the above formula (7), the first power headroom can be determined. For example, the first power headroom PH type3,b,f,c (i,q s ) satisfies formula (8):

[0131] Among them, PH type3,b,f,c (i,q s ) represents the first power headroom of the first terminal. The specific meanings of other parameters in formula (8) can be referred to the corresponding descriptions of formula (1) and formula (7) above, and will not be repeated here.

[0132] (3) Case 3: When the path loss parameter of the first terminal is the first path loss value and the first path loss change value of the first terminal, the transmission power P of the first signal SRS,b,f,c (i,q s ,l) satisfies formula (9):

[0133] The specific meanings of the parameters in formula (9) can be found in the corresponding description of formula (1) above and will not be repeated here.

[0134] Based on the above formula (9), the first power headroom can be determined. For example, the first power headroom PH type3,b,f,c (i,qs ) satisfies formula (10):

[0135] The specific meanings of the parameters in formula (10) can be found in the corresponding descriptions of formula (1) and formula (7) above, and will not be repeated here.

[0136] Optionally, the first indication information may also include the transmit power of the first signal that the second device expects to receive, the number of RBs in the SRS bandwidth, the path loss compensation factor, the power adjustment amount, or the index q of the reference signal. d ; or the above parameters may be pre-configured by the first device. For example, the first device receives first indication information from the second device, and the first device determines the transmit power of the first signal based on at least one of the first path loss value or the first path loss change value in the first indication information, the transmit power of the first signal that the second device expects to receive, the number of RBs in the SRS bandwidth, the path loss compensation factor, and the power adjustment amount. Under the condition that the transmit power is less than or equal to the maximum transmit power of the first terminal, the first device determines the final transmit power of the first signal. Or, for example, the first device receives first indication information, and the first device determines the transmit power of the first signal sent by the first terminal based on at least one of the first path loss value or the first path loss change value in the first indication information and the parameters pre-configured by the first terminal itself.

[0137] Optionally, the second indication information is also used to indicate the path loss parameter used by the first device to determine the power margin. For example, assuming that the first indication information is used to indicate multiple path loss values ​​of the first terminal, the first device receives multiple path loss values ​​and can calculate multiple transmit powers and multiple power margins based on the multiple path loss values, thereby determining the transmit power of the first signal sent by the first terminal and the corresponding power margin. The second indication information can also be used to indicate the path loss parameter corresponding to the power margin. For example, the second indication information includes a first field, which is used to indicate the path loss parameter used by the first device to determine the power margin. Assume that the first field contains 2 bits of information. Assume that the multiple path loss values ​​of the first terminal include a first PL of 12dB, a second PL of 8dB, a third PL of 10dB, and a fourth PL of 6dB. Assume that the first device determines the transmit power and the first power headroom for the first terminal to send the first signal based on the first PL (12dB). The first device sends second indication information to the second device. The value of the first field in the second indication information is 00, which is used to indicate that the path loss value used by the first device to determine the first power headroom is the first PL (12dB). The specific bit information values ​​and meanings are shown in Table 5:

[0138] Table 5 Correspondence between the first field of the second indication information and the path loss value

[0139] It should be noted that the corresponding relationship in Table 5 is predefined, and the value of the first field of the second indication information has no direct relationship with the path loss value. The table is just an example of one type.

[0140] Optionally, if the first power margin calculated by the first device is a negative value, it means that the transmit power determined by the first device through formula (5) or formula (7) has exceeded the maximum transmit power of the first terminal. In this case, the first device can reselect another path loss parameter from the multiple path loss parameters of the first terminal to calculate the transmit power of the first signal and the corresponding power margin. For example, the first device selects another path loss parameter that is smaller than the maximum value in descending order, or selects the average value of multiple path loss parameters to calculate the transmit power of the first signal. For example, assume that the multiple path loss parameters of the first terminal include 6dB, 11dB, 13dB and 18dB. If the first power margin obtained by the first device to calculate the transmit power of the first signal based on the maximum value (18dB) is a negative value, the first device can select a second maximum value (13dB) or an average value (12dB) other than the maximum value (18dB) to calculate the transmit power of the first signal and the first power margin. Optionally, if the first power margin calculated by the first device using the second maximum value (13dB) and the average value (12dB) are both negative values, the first device can select another path loss parameter that is smaller than the second maximum value and smaller than the average value from large to small (first select 11dB, then select 6dB) to calculate the transmission power of the first signal and the first power margin, until the first power margin is a positive value.

[0141] In this embodiment, the first device can receive the first indication information, thereby obtaining the path loss information used to calculate the transmission power for sending the first signal (for example, the uplink signal for perception), so that the first device can calculate the transmission power and / or power margin more accurately, which is beneficial for the first device to flexibly adjust the signal transmission power according to the changes in the path loss information of the perception scenario, thereby meeting the perception signal transmission power requirements and improving the perception performance.

[0142] For example, FIG6 is a flow chart of another power control method provided by the present application. The method can be implemented by interaction between a first device and a second device. For example, the first device is a terminal and the second device is a network device. The method includes but is not limited to the following steps:

[0143] S201: A second device determines a path loss parameter of at least one first device.

[0144] For example, the at least one first device includes a first terminal and a second terminal, and the path loss parameter of the at least one device includes a path loss parameter of the first terminal and a path loss parameter of the second terminal.

[0145] Among them, the specific implementation of S201 can refer to the relevant description of S101 in the aforementioned embodiment. For example, the second device determines the path loss parameter configured for the first terminal in the first indication information based on the location information of the first terminal, the carrier frequency of the first signal, the location information of the environmental scatterer and the area of ​​the radar scattering surface, which will not be repeated here.

[0146] S202, the second device sends first indication information; correspondingly, the first device receives the first indication information.

[0147] Among them, the specific implementation of S202 can refer to the relevant description of S101 in the above embodiment. For example, the second device sends the first indication information to the first device, and the second device instructs the first device to compensate for the path loss of sending the first signal, which will not be repeated here.

[0148] S203: The first device determines multiple path loss parameters of the first terminal.

[0149] The first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal, respectively, where the multiple path loss parameters include a path loss reference value and multiple related values. For example, assuming that the first indication information includes multiple fields, a first field among the multiple fields is used to indicate the path loss reference value, and the remaining fields among the multiple fields are used to indicate the remaining path loss values ​​and related values ​​of the path loss reference value, respectively.

[0150] Optionally, the path loss reference value is the maximum value or average value of multiple path loss parameters. For example, the first device receives multiple paths to the first terminal indicated by the second device, and the multiple path loss parameters corresponding to the multiple paths are 6dB, 11dB, 13dB, and 18dB, respectively. The path loss reference value indicated by the first field is the maximum value (18dB) or the average value (12dB). The specific method for determining the path loss reference value can be found in the relevant description of Table 1, Table 2, Table 3, or Table 4 in S101 in the aforementioned embodiment, and will not be repeated here.

[0151] For example, assuming that the path loss reference value is the maximum value, each field in the first indication information may contain 3 bits of information, and the multiple fields in the first indication information are assumed to be four (the first field, the second field, the third field, and the fourth field). Among them, the first field indicates the path loss reference value, and the specific bit values ​​and meanings of the remaining fields (such as the second field, the third field, and the fourth field) are as shown in Table 6 below:

[0152] Table 6 Correspondence between other fields and related values

[0153] It should be noted that the corresponding relationship in Table 6 is predefined, and the values ​​of the remaining fields except the first field in the first indication information have no direct relationship with the related values. The table is just an example of one kind.

[0154] Optionally, a correlation value may be a fixed value, and the first operation is assumed to be an addition or subtraction operation (or a similar variation of the addition or subtraction operation), and the path loss reference value is added or subtracted from multiple fixed values ​​to obtain multiple path loss values. For example, assuming that the first operation is subtracting the path loss reference value from multiple correlation values, the path loss reference value indicated by the first field is 18dB, and the correlation values ​​indicated by the remaining fields are 1dB, 5dB, and 8dB (i.e., the fixed values ​​are 1dB, 5dB, and 8dB), then the first device can determine, based on the first operation, that the multiple path loss parameters of the first terminal are 18dB, 17dB, 13dB, and 10dB, respectively.

[0155] Optionally, a correlation value is a proportional coefficient, and the first operation is assumed to be a multiplication or division operation (or a similar variation of the multiplication or division operation), and the path loss reference value is multiplied or divided by multiple proportional coefficients to obtain multiple path loss values. For example, assuming that the first operation is the multiplication of the path loss reference value by multiple correlation values, the path loss reference value indicated by the first field is 18dB, and the correlation values ​​indicated by the remaining fields are 0.9, 0.6, and 0.4 (i.e., the proportional coefficients are 0.9, 0.6, and 0.4), then the first device can determine that the multiple path loss parameters of the first terminal are 18dB, 16.2dB, 10.8dB, and 7.2dB based on the first operation.

[0156] Optionally, a specific implementation manner in which the first device determines the path loss parameter associated with the first terminal from the first indication information may include the following:

[0157] Case 1: If there are multiple first devices and the first indication information is used to indicate multiple path loss parameters, the first device determines, based on the identifier of the first terminal, the path loss parameter associated with the identifier of the first terminal in the first indication information. Optionally, the first indication information may further include the identifier of the first terminal, and the first device may determine, based on the identifier, the path loss parameter associated with the identifier of the first terminal in the first indication information.

[0158] For example, assume that a first device includes a first terminal and a second terminal. The paths along which the first terminal transmits a first signal include path 1 and path 2, and the paths along which the second terminal transmits the first signal include path 3 and path 4. For paths 1 and 2, the first terminal receives first indication information from the second device. The two path loss parameters corresponding to paths 1 and 2, respectively, carried in the first indication information, are associated with the first terminal's identifier. Therefore, after receiving the first indication information, the first terminal can compare its own identifier with the identifier of the first terminal in the first indication information. If they match, the first terminal determines the path loss parameters associated with the first terminal's identifier in the first indication information. Optionally, for paths 3 and 4, the second terminal receives first indication information from the second device. The two path loss parameters corresponding to paths 3 and 4, respectively, carried in the first indication information, are associated with the identifier of the second terminal. Therefore, after receiving the first indication information, the second terminal can compare its own identifier with the identifier of the second terminal in the first indication information. If they match, the second terminal determines the path loss parameters associated with the second terminal's identifier in the first indication information.

[0159] Optionally, the first indication information is scrambled using the identifier of the first terminal; if the first device can descramble the first indication information based on the identifier, it means that the first indication information includes a path loss parameter associated with the identifier of the first terminal. Optionally, the first indication information can be scrambled using a radio network temporary identity (RNTI) using the identifier of the first terminal. For example, based on the above-mentioned hypothetical information, the second device uses the identifier of the first terminal to scramble the message (such as an RRC message, a DCI message, etc.) carrying the first indication information. After the first device receives the first indication information, assuming that the first device can descramble the message carrying the first indication information based on the identifier of the first terminal to obtain the path loss parameter carried in the first indication information, the first device can determine the path loss parameter corresponding to the first terminal.

[0160] Case 2: If there are multiple first devices and the first indication information is used to indicate multiple path loss parameters, the first device determines the path loss parameter associated with the location information of the first terminal in the first indication information based on the location information of the first terminal. Optionally, the first indication information may also include the location information of the first device, and the first device may determine the path loss parameter associated with the location information of the first terminal in the first indication information based on the location information.

[0161] For example, the second device can determine the path loss parameter of the first terminal based on the location information and other relevant parameters of the first device, and the location information of the first terminal can be associated with the path loss parameter corresponding to the first terminal. For example, assuming that the first device includes a first terminal and a second terminal, the two path loss parameters corresponding to path 1 and path 2 respectively carried in the first indication information are associated with the location information of the first terminal, and the two path loss parameters corresponding to path 3 and path 4 respectively are associated with the location information of the second terminal. After the first terminal and the second terminal receive the first indication information, they can compare the location information of their own terminals with the location information of the terminals in the first indication information. If they are consistent, the first terminal determines the path loss parameter associated with the location information of the first terminal in the first indication information, and the second terminal determines the path loss parameter associated with the location information of the second terminal in the first indication information.

[0162] Optionally, a specific implementation method for the first device to determine the path loss parameter used for the first power margin may include: if the number of the first devices is one or more, and the first indication information is used to indicate multiple path loss parameters, the first device determines that the maximum value of the multiple path loss parameters associated with the first terminal is the path loss parameter used by the first device to determine the first power margin. For example, the first device receives the first indication information from the second device. Assuming that the first indication information carries multiple path loss parameters associated with the first terminal, which are 12dB, 8dB, 10dB, and 6dB, respectively, the first device can determine that the maximum value of the above path loss parameters is 12dB, that is, the path loss parameter used by the first device to determine the first power margin is 12dB.

[0163] S204: The first device determines the transmit power and the first power headroom of the first signal sent by the first terminal.

[0164] The specific implementation of S204 can refer to the relevant description of S102 in the above embodiment. For example, the transmission power of the first signal is determined based on the path loss parameter of the first terminal. The transmission power P of the first signal is SRS,b,f,c (i,q s ,l) satisfies formula (5) or formula (7), and the first power margin satisfies formula (6) or formula (8), which will not be repeated here.

[0165] S205, the first device sends second indication information; correspondingly, the second device receives the second indication information.

[0166] Among them, the specific implementation of S205 can refer to the relevant description of S102 in the aforementioned embodiment. For example, the first device sends a second indication information to the second device, thereby indicating the first power margin to the second device and the path loss parameter used by the first device to determine the first power margin. It will not be repeated here.

[0167] FIG7 is a schematic diagram of a communication device provided by the present application. The device may include a module corresponding to the method / operation / step / action described in any of the embodiments shown in FIG4 and FIG6 , and the module may be implemented as a hardware circuit, software, or a combination of hardware circuit and software.

[0168] The apparatus 700 includes a communication unit 701 and a processing unit 702, which are used to implement the methods executed by the devices in the above embodiments. The communication unit 701 is also called a transceiver unit, which includes a sending unit and a receiving unit. The sending unit is used to send signals, and the receiving unit is used to receive signals.

[0169] In one possible implementation, the communication device may be a terminal, a device of a terminal, or a device capable of being used in conjunction with a terminal. Specifically, the communication unit 701 is configured to receive first indication information from a second device, the first indication information being used to indicate a path loss parameter of at least one first device. The at least one first device includes a first terminal, the path loss parameter including at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for a path loss of a first signal transmitted by the first terminal; the path traversed by the first signal includes a path from the first terminal to the second device through environmental scatterers. The processing unit is configured to determine a first power headroom of the first terminal based on the path loss parameter of the first terminal. The communication unit 701 is further configured to send second indication information to the second device; the second indication information being used to indicate a first power headroom of the first terminal; the first power headroom being the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, the transmit power of the first signal being determined based on the path loss parameter of the first terminal.

[0170] Optionally, the processing unit 702 is configured to process information sent or received by the communication unit 701. For example, the processing unit 702 is configured to process first indication information received by the communication unit 701; and perform a first operation on the path loss reference value and multiple related values ​​to determine multiple path loss parameters of the first terminal.

[0171] The specific execution process of the communication unit 701 and the processing unit 702 in this embodiment can refer to the description of the steps performed by the first device in the method embodiment above, as well as the related description, which will not be repeated here. In this method, the first device can receive the first indication information, thereby obtaining the path loss information used to calculate the transmission power of the first signal (for example, the uplink signal for perception), so that the first device can calculate the transmission power and / or power margin more accurately, which is beneficial for the first device to flexibly adjust the signal transmission power according to the change of the path loss information of the perception scene, thereby meeting the perception signal transmission power requirement and improving the perception performance.

[0172] In one possible implementation, the communication device may be a network device, or a device of a network device, or a device that can be used in conjunction with a network device. Specifically, the communication unit 701 is used to send first indication information to at least one first device, where the first indication information is used to indicate a path loss parameter of the at least one first device. The at least one first device includes a first terminal, and the path loss parameter includes at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; the first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal sending the first signal; the path passed by the first signal includes a path from the first terminal to the second device through an environmental scatterer. The communication unit 701 is also used to receive second indication information from the first device; the second indication information is used to indicate a first power margin of the first terminal; the first power margin is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, and the transmit power of the first signal is determined based on the path loss parameter of the first terminal.

[0173] The specific execution process of the communication unit 701 and the processing unit 702 in this embodiment can refer to the description of the steps performed by the second device in the method embodiment above, as well as the related description, and will not be repeated here. In this method, the second device indicates the path loss information used to calculate the transmit power for sending the first signal to the first device by sending the first indication information. This helps the first device flexibly adjust the signal transmit power according to changes in the path loss information of the perceived scene, thereby meeting the perceived signal transmit power requirement and improving the perception performance.

[0174] In one possible implementation, when the communication device is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor, microprocessor, integrated circuit, or logic circuit integrated on the chip.

[0175] Figure 8 is a schematic diagram of another communication device provided by the present application. The communication device can be used to execute the steps executed by the first device or the second device in the above method embodiment, and reference can be made to the relevant description in the above method embodiment.

[0176] The communication device includes a processor 801. Optionally, the communication device further includes a memory 802 and a transceiver 803.

[0177] In a possible implementation, the processor 801, the memory 802, and the transceiver 803 are connected via buses, and computer instructions are stored in the memory.

[0178] Optionally, the processing unit 702 in the aforementioned embodiment may specifically be the processor 801 in this embodiment, so the specific implementation of the processor 801 is not repeated. The communication unit 701 in the aforementioned embodiment may specifically be the transceiver 803 in this embodiment, so the specific implementation of the transceiver 803 is not repeated.

[0179] In this application, a processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in this application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in this application may be directly executed by a hardware processor, or by a combination of hardware and software modules within the processor.

[0180] In the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the present application may also be a circuit or any other device that can implement a storage function, for storing program instructions and / or data.

[0181] The present application provides another communication device, which includes a processor and an interface. Optionally, it also includes a memory, the processor is coupled to the memory, and the processor is used to read and execute computer instructions stored in the memory to implement the communication method in the embodiments shown in Figures 4 and 6.

[0182] The present application provides a computer-readable storage medium. The computer-readable storage medium stores a program or instruction. When the program or instruction is executed on a computer, the computer executes the communication method in the embodiments shown in Figures 4 and 6.

[0183] The present application provides a chip or chip system, which includes at least one processor and an interface, the interface and the at least one processor are interconnected by lines, and the at least one processor is used to run computer programs or instructions to execute the communication method in the embodiments shown in Figures 4 and 6.

[0184] The interface in the chip may be an input / output interface, a pin, or a circuit.

[0185] The chip system may be a system on chip (SOC) or a baseband chip, wherein the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, and the like.

[0186] In one implementation, the chip or chip system described above in this application further includes at least one memory, in which instructions are stored. The memory may be a storage unit within the chip, such as a register, a cache, etc., or a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

[0187] The present application provides a computer program product. The computer program product includes instructions. When the instructions are executed on a computer, the computer executes the communication method in the embodiments shown in Figures 4 and 6.

[0188] The present application also provides a communication system including a first communication device and a second communication device. The first communication device is configured to execute all or part of the steps executed by the first device in the above embodiment. The second communication device is configured to execute all or part of the steps executed by the second device in the above embodiment.

[0189] The technical solutions provided in this application can be implemented in whole or in part through software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in this application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a terminal, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium.

[0190] In this application, under the premise that there is no logical contradiction, the various embodiments may reference each other, for example, the methods and / or terms between method embodiments may reference each other, for example, the functions and / or terms between device embodiments may reference each other, for example, the functions and / or terms between device embodiments and method embodiments may reference each other.

[0191] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A power control method, characterized in that, Including: Receiving first indication information from a second device, where the first indication information is used to indicate path loss parameters of at least one first device; The at least one first device includes a first terminal, and the path loss parameters include at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; The first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal when transmitting a first signal; the path through which the first signal passes includes the path from the first terminal to the second device via an environmental scatterer; Sending second indication information to the second device, where the second indication information is used to indicate a first power margin of the first terminal, and the first power margin is the difference between the maximum transmit power of the first terminal and the transmit power of the first signal, and the transmit power of the first signal is determined based on the path loss parameters of the first terminal.

2. The method according to claim 1, wherein The path through which the first signal passes includes one or more paths of the first terminal; The first indication information is used to indicate the path loss parameter of one path of the first terminal; or; The first indication information is used to indicate multiple path loss parameters corresponding to multiple paths of the first terminal respectively.

3. The method according to claim 2, wherein The multiple path loss parameters corresponding to the multiple paths respectively include a path loss reference value and multiple correlation values; the method further includes: Performing a first operation on the path loss reference value and the multiple correlation values to determine multiple path loss parameters of the first terminal.

4. The method according to claim 3, characterized in that The method further includes: Determining the maximum value of multiple path loss parameters corresponding to multiple paths of the first terminal respectively; Determining the transmit power of the first terminal for transmitting the first signal based on the maximum value of the path loss parameters.

5. The method according to any one of claims 1 to 4, characterized in that The method further includes: Based on the identifier of the first terminal, determining the path loss parameter associated with the identifier of the first terminal in the first indication information; or; Based on the location information of the first terminal, determining the path loss parameter associated with the location information of the first terminal in the first indication information.

6. The method according to any one of claims 1 to 4, characterized in that The first path loss value is determined based on the location information of the first terminal, the location information of the environmental scatterer, the area of the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; The first path loss change value is the difference between a first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of a reference signal determined based on the location information of the first terminal.

7. The method according to claim 1, wherein The second indication information is further used to indicate the path loss parameter used by the first device to determine the first power margin.

8. A power control method, characterized in that, Including: Sending first indication information to at least one first device, where the first indication information is used to indicate path loss parameters of at least one first device; The at least one first device includes a first terminal, and the path loss parameters include at least one of a first path loss value of the first terminal or a first path loss change value of the first terminal; The first path loss value or the first path loss change value is used to compensate for the path loss of the first terminal transmitting the first signal; the path through which the first signal passes includes the path from the first terminal to the second device via the environmental scatterer; Receiving second indication information from the first device, the second indication information being used to indicate a first power margin of the first terminal, the first power margin being the difference between the maximum transmission power of the first terminal and the transmission power of the first signal, and the transmission power of the first signal being determined based on the path loss parameter of the first terminal.

9. The method according to claim 8, characterized in that, The path through which the first signal passes includes one path or multiple paths of the first terminal; The first indication information is used to indicate the path loss parameter of one path of the first terminal; or; The first indication information is used to indicate multiple path loss parameters respectively corresponding to multiple paths of the first terminal.

10. The method according to claim 9, characterized in that, The multiple path loss parameters respectively corresponding to the multiple paths include a path loss reference value and multiple correlation values; the path loss reference value and the multiple correlation values are used by the first device to determine multiple path loss parameters of the first terminal based on a first operation.

11. The method according to any one of claims 8 to 10, characterized in that, The first path loss value is determined based on the position information of the first terminal, the position information of the environmental scatterer, the area of the radar scattering surface of the environmental scatterer, and the carrier frequency of the first signal; The first path loss change value is the difference between a first measurement value and the first path loss value, and the first measurement value is the path loss value of the direct path of the reference signal determined based on the position information of the first terminal.

12. The method according to claim 8, characterized in that The second indication information is further used to indicate the path loss parameter used by the first device to determine the first power margin.

13. A communication device, characterized in that, Comprising a communication unit and a processing unit, the communication unit and the processing unit are used to execute the method according to any one of claims 1 to 7 or claims 8 to 12.

14. A communication device, characterized in that, Comprising a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices, and the processor is used to implement the method according to any one of claims 1 to 7 or claims 8 to 12 through logic circuits or by executing code instructions.

15. A computer-readable storage medium, characterized in that, A computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is executed by a communication device, the method according to any one of claims 1 to 7 or claims 8 to 12 is implemented.

16. A chip system, characterized in that, The chip system comprises a processor and an interface, and the processor is used to execute a computer program, so that the chip system implements the method according to any one of claims 1 to 7 or claims 8 to 12.

17. A computer program product, characterized in that, Comprising instructions, when the instructions run on a computer, the computer is made to execute the method according to any one of claims 1 to 7 or claims 8 to 12.

18. A communication system, characterized in that, The communication system comprises a device for executing the method according to any one of claims 1 to 7, and a device for executing the method according to any one of claims 8 to 12.

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