Communication method and device, storage medium, and chip system

Abstract

A communication method and apparatus, a storage medium, and a chip system are provided, which relate to the field of communication technologies and are used to provide a power control scheme used when a terminal device transmits a sidelink positioning reference signal. In this application, a first terminal device receives a power control parameter from a network device and transmits a first sidelink positioning reference signal based on a target transmission power determined by using the power control parameter. The power control parameter has an association relationship with a resource pool of the sidelink positioning reference signal. Therefore, the first terminal device may determine a more appropriate transmission power for the sidelink positioning reference signal based on the power control parameter, thereby improving the quality of the sidelink positioning reference signal, thereby not only improving the success rate of transmitting the sidelink positioning reference signal but also reducing mutual interference between signals transmitted between terminal devices as much as possible.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to Chinese Patent Application No. 202210966591.2, entitled "COMMUNICATION METHOD AND APPARATUS, STORAGE MEDIUM, AND CHIP SYSTEM," filed with the State Intellectual Property Office of the People's Republic of China on August 12, 2022, the entire contents of which are incorporated herein by reference.

[0002] [Technical field] This application relates to the field of communication technology, and in particular to a communication method and device, a storage medium and a chip system. [Background technology]

[0003] With the rapid development of communication technology, high-precision positioning has gradually been determined as a key research project in the 5th Generation Mobile Networks (5G) mobile communication system of the 3rd Generation Partnership Project (3GPP®). New Radio (NR) positioning scenarios mainly include enhanced Mobile Broadband (eMBB) outdoor, eMBB indoor, Ultra-Reliable Low-Latency Communication (URLLC), and massive Machine Type Communication (mMTC) / Internet of Things (IoT). NR positioning also requires characteristics such as high security, scalability, high availability, and guaranteed accuracy in high-speed applications.

[0004] Current positioning technologies mainly include uplink positioning, downlink positioning, and uplink and downlink positioning. In the uplink positioning process, a network device (e.g., a base station) measures a reference signal transmitted by a terminal device. In the downlink positioning process, a terminal device measures a positioning reference signal transmitted by a network device. In uplink and downlink positioning, both the terminal device and the network device need to measure received signals. With the development of technologies such as Internet of Vehicles technology and autonomous driving technology, research based on future sidelink positioning is gradually attracting attention from academia and industry.

[0005] Furthermore, controlling the transmission power of signals in wireless communication systems is very important. For example, by controlling the power of uplink signals, a terminal device can not only ensure the quality of uplink data, but also reduce interference to the system and other users as much as possible, thereby extending the battery life of the terminal device. By controlling the power of uplink signals, a base station can enable uplink transmission to adapt to different wireless transmission environments, including path loss, shadows, fast fading, interference from other terminal devices within and between cells, etc. However, in a scenario based on sidelink positioning, there is currently no power control mechanism. Summary of the Invention

[0006] Embodiments of the present application provide a communication method and apparatus, a storage medium, and a chip system for providing a power control scheme used when a terminal device transmits a sidelink positioning reference signal.

[0007] According to a first aspect, this application provides a first communication method. The method may be performed by a first terminal device, or may be performed by a module, unit, or chip inside the first terminal device. In this application, an example in which the method is performed by the first terminal device is used for explanation. The method includes:

[0008] The first terminal device receives a power control parameter from the network device, the power control parameter having an association relationship with a resource pool of the sidelink positioning reference signal, determines a target transmit power based on the power control parameter, and transmits the first sidelink positioning reference signal based on the target transmit power.

[0009] The network device indicates the power control parameter to the terminal device, and the power control parameter has an association relationship with the resource pool of the sidelink positioning reference signal. Thus, the first terminal device may determine a more appropriate transmission power of the sidelink positioning reference signal based on the power control parameter, thereby improving the quality of the sidelink positioning reference signal, thereby not only improving the success rate of transmitting the sidelink positioning reference signal, but also ensuring that mutual interference between signals transmitted between terminal devices is reduced as much as possible.

[0010] In some applications, the network device may configure a resource pool for transmission data and / or transmission signals. For example, the network device may configure a resource pool for a sidelink positioning reference signal of a first terminal device, and resources in the resource pool are used by the first terminal device to transmit the sidelink positioning reference signal. Furthermore, the network device may further configure parameters for the resource pool. For example, the network device may configure parameters (including power control parameters) for the resource pool for the sidelink positioning reference signal. When the first terminal device needs to perform power control on the transmitted sidelink positioning reference signal, the first terminal device may determine the transmission power of the sidelink positioning reference signal based on the configured parameters for the resource pool for the sidelink positioning reference signal. As a result, the quality of the sidelink positioning reference signal can be improved, thereby not only improving the success rate of transmitting the sidelink positioning reference signal but also reducing mutual interference between the sidelink positioning reference signals transmitted between terminal devices as much as possible.

[0011] In a possible implementation, the power control parameters may include a first parameter. The first parameter may include a third parameter and / or a downlink path loss adjustment factor. The third parameter is an initial power control value based on the downlink path loss of the first terminal device. In this way, in the process of determining the transmission power of the sidelink positioning reference signal, the first terminal device may take into account the effect of the downlink path loss, thereby enabling a more appropriate determination of the transmission power of the sidelink positioning reference signal. Furthermore, the downlink path loss obtained through measurement may be adjusted based on the downlink path loss adjustment factor, thereby enabling a more appropriate transmission power of the sidelink positioning reference signal to be obtained.

[0012] In a possible implementation, when the network device does not configure the downlink path loss adjustment factor, the downlink path loss adjustment factor is 1. In this way, when the network device does not configure the downlink path loss adjustment factor, the first terminal device may determine the target transmission power based on the downlink path loss obtained through measurement. In this way, the target transmission power can be determined based on the maximum impact that may be caused by the downlink path loss, so that the target transmission power is more appropriate.

[0013] In another possible implementation, the power control parameters may include a second parameter. The second parameter may include a fourth parameter and / or a sidelink pathloss adjustment factor, where the fourth parameter is an initial power control value based on the sidelink pathloss of the first terminal device. In this way, in the process of determining the transmission power of the sidelink positioning reference signal, the first terminal device may take into account the effect of the sidelink pathloss, thereby enabling a more appropriate determination of the transmission power of the sidelink positioning reference signal. Furthermore, the sidelink pathloss obtained through measurement may be adjusted based on the sidelink pathloss adjustment factor, thereby enabling a more appropriate transmission power of the sidelink positioning reference signal to be obtained.

[0014] In another possible implementation, when the network device does not configure the sidelink pathloss adjustment factor, the sidelink pathloss adjustment factor is 1. In this way, when the network device does not configure the sidelink pathloss adjustment factor, the first terminal device may determine the target transmission power based on the sidelink pathloss obtained through measurements. In this way, the target transmission power can be determined based on the maximum impact that may be caused by the sidelink pathloss, thereby making the target transmission power more appropriate.

[0015] In a possible implementation, the first parameter and / or the second parameter may be carried in a SL-resource Pool message, e.g., in a SL-power control field in the SL-resource Pool message, which is thus more compatible with prior art.

[0016] In a possible implementation, the first terminal device determines a target transmission power based on a first transmission power. The first transmission power is determined based on a first parameter and a downlink path loss. In this way, in the process of determining the target transmission power, the first terminal device may take into account the influence caused by the downlink path, thereby enabling a more appropriate target transmission power to be determined. In another example, the first transmission power is determined based on the first parameter, the downlink path loss, and the number of resources occupied by the first sidelink positioning reference signal. In this way, the target transmission power may be determined with reference to the number of resources occupied by the first sidelink positioning reference signal, thereby enabling a more appropriate result.

[0017] In a possible implementation, the first terminal device determines a target transmission power based on a second transmission power. The second transmission power is determined based on the second parameter and the sidelink path loss. In this way, in the process of determining the target transmission power, the first terminal device may take into account the influence caused by the sidelink path, thereby enabling a more appropriate target transmission power to be determined. In another example, the second transmission power is determined based on the second parameter, the sidelink path loss, and the number of resources occupied by the first sidelink positioning reference signal. In this way, the target transmission power may be determined with reference to the number of resources occupied by the first sidelink positioning reference signal, thereby enabling a more appropriate result.

[0018] In a possible implementation, when the network device does not configure the third parameter, the first transmission power includes the smaller value of the third transmission power and the fourth transmission power. The third transmission power includes the transmission power of the first terminal device based on a Channel Busy Ratio (CBR) of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal. The fourth transmission power includes the transmission power of the first terminal device. Thus, when the network device does not configure the third parameter, the first terminal device may determine a target transmission power based on the capabilities of the terminal device and the capabilities of the terminal device under the conditions of the CBR and the transmission priority, so that the determined target transmission power better matches the actual capabilities of the first terminal device.

[0019] In a possible implementation, when the network device does not configure the fourth parameter, the second transmission power comprises the smaller value of the third transmission power and the fourth transmission power. In this way, when the network device does not configure the fourth parameter, the first terminal device may determine the target transmission power based on the capabilities of the terminal device and the capabilities of the terminal device under the conditions of CBR and transmission priority, so that the determined target transmission power can better match the actual capabilities of the first terminal device.

[0020] In a possible implementation, the first terminal device determines the target transmission power based on the smaller value of the first transmission power and the second transmission power, so that the target transmission power can be reduced as much as possible, thereby reducing the power consumption of the terminal device.

[0021] In a possible implementation, the first terminal device may estimate a downlink path loss based on a downlink signal, for example, the first terminal device receives a downlink signal from a network device, and the first terminal device estimates a downlink path loss based on a measurement result obtained by measuring the downlink signal.

[0022] In this application, the first terminal device estimates the sidelink pathloss in multiple ways. For example, in a possible implementation, the first terminal device receives first information from the second terminal device, the first information including information on the received power of the sidelink signal from the first terminal device or information on the sidelink pathloss. The first terminal device determines the sidelink pathloss based on the first information. In this implementation, the first terminal device may transmit a sidelink signal used to determine the sidelink pathloss, thereby causing the second terminal device to measure the sidelink signal. In this solution, the sidelink pathloss is determined based on information transmitted between the first terminal device and the second terminal device via the sidelink, thereby improving the accuracy of the sidelink pathloss.

[0023] In a possible implementation, the first information may further include a resource identifier of a sidelink signal from the first terminal device and / or a resource set identifier corresponding to the resource of the sidelink signal from the first terminal device. Part or all of the two pieces of information may be included in the first information, or they may not be included in the first information. Next, some of the contents will be described using an example in which the two pieces of information are included in the first information. In this way, the first terminal device may determine a sidelink signal corresponding to the received power included in the first information, and then determine a sidelink pathloss based on the transmit power of the sidelink signal and the received power in the first information.

[0024] For example, the first information may include one of the following: information on the received power of a first sidelink signal, the first sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and the type of the first sidelink signal including a sidelink positioning reference signal; information on the received power of a second sidelink signal, the second sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and the type of the second sidelink signal including a physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) or a physical sidelink control channel (PSCCH) DMRS; or information on sidelink pathloss, the information on sidelink pathloss being determined based on the first sidelink signal or the second sidelink signal. The sidelink path loss may be determined between the first and second terminal devices based on the sidelink positioning reference signal, the PSSCH DMRS or the PSCCH DMRS, thereby allowing for improved solution flexibility.

[0025] In a possible implementation, before the first terminal device receives the first information from the second terminal device, the first terminal device transmits first configuration information to the second terminal device, the first configuration information indicating information about sidelink signals used to determine the sidelink pathloss. In this way, the second terminal device may perform measurements based on the sidelink signals configured by using the first configuration information, thereby enabling better management and control of the process of determining the sidelink pathloss.

[0026] For example, the first configuration information may include at least one of information on a first signal type, a first resource identifier, or a first resource set identifier. The first signal type is a type of sidelink signal used to determine the sidelink pathloss. Referring to the above example, the first resource identifier may include a resource identifier of the first sidelink signal. The first resource set identifier may include a resource set identifier corresponding to the resources of the first sidelink signal. It can be seen that there are multiple ways to configure the sidelink signal by using the first configuration information, and the ways are flexible, thereby improving the flexibility of the solution.

[0027] In one possible implementation, the first signal type includes a sidelink positioning reference signal type, and since the determined target transmit power is the transmit power of the first sidelink positioning reference signal, the sidelink path loss determined based on the sidelink positioning reference signal can more accurately reflect the environment experienced by the first sidelink positioning reference signal, thereby improving the accuracy of the target transmit power.

[0028] In another possible implementation, the first signal type includes a PSSCH DMRS type and / or a PSCCH DMRS type. The second terminal device may further measure the PSSCH DMRS and / or the PSCCH DMRS and feed back the first information based on the measurement result, thereby improving the flexibility of the solution. Furthermore, if the first signal type does not include a sidelink positioning reference signal, the first terminal device may not need to transmit a sidelink positioning reference signal to determine the sidelink path loss, thereby reducing the number of signals transmitted by the first terminal device and reducing the power consumption of the first terminal device.

[0029] In another possible implementation, the first configuration information may further include information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. In this way, the flexibility of the solution can be improved.

[0030] In this application, the first terminal device may transmit the first configuration information to the second terminal device through the PC5 interface, or may transmit the first configuration information to the network device, so that the network device transmits the first configuration information to the second terminal device. In another possible implementation manner, the first configuration information may alternatively be configured by the network device for the second terminal device. For example, the network device may transmit the first configuration information to the second terminal device (e.g., may transmit the first configuration information by using a radio resource control (RRC) message).

[0031] This application provides another method for determining sidelink pathloss. The first information includes information about the transmission power of a sidelink signal transmitted by a second terminal device. In this implementation, the second terminal device may transmit a sidelink signal used to determine the sidelink pathloss, thereby causing the first terminal device to measure the sidelink signal. For example, the first information may include information about the transmission power of a third sidelink signal, the third sidelink signal being from the second terminal device, and the type of the third sidelink signal including a sidelink positioning reference signal, and / or information about the transmission power of a fourth sidelink signal, the fourth sidelink signal being from the second terminal device, the third sidelink signal including a sidelink positioning reference signal, and the type of the fourth sidelink signal including a PSSCH DMRS or a PSCCH DMRS. In this solution, the sidelink pathloss is determined based on information transmitted between the first and second terminal devices via the sidelink, thereby improving the accuracy of the sidelink pathloss determination.

[0032] In a possible implementation, when the first terminal device obtains the received power of the third sidelink signal, the first terminal device determines a sidelink pathloss based on the received power of the third sidelink signal and the transmit power of the third sidelink signal. Since the determined target transmit power is the transmit power of the first sidelink positioning reference signal, the sidelink pathloss determined based on the sidelink positioning reference signal can more accurately reflect the environment faced by the first sidelink positioning reference signal, and therefore the accuracy of the target transmit power can be improved.

[0033] In another possible implementation, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device determines the sidelink pathloss based on the received power of the fourth sidelink signal and the transmit power of the fourth sidelink signal. This improves the flexibility of the solution. Furthermore, since the fourth sidelink signal is a signal transmitted between the second terminal device and the first terminal device via the sidelink, the fourth sidelink signal can also accurately reflect the sidelink pathloss, thereby improving the accuracy of the target transmit power.

[0034] In a possible implementation, before the first terminal device determines the sidelink pathloss based on the first information, the first terminal device receives second configuration information, which second configuration information indicates information about sidelink signals used to determine the sidelink pathloss. In this way, the second terminal device may perform measurements based on the sidelink signals configured by using the first configuration information, thereby enabling better management and control of the process of determining the sidelink pathloss.

[0035] For example, the second configuration information may include at least one of information on a second signal type, a second resource identifier, or a second resource set identifier. Information on the second signal type. The second signal type is a type of sidelink signal used to determine the sidelink pathloss. Referring to the above example, the second resource identifier may include a resource identifier of a third sidelink signal. The second resource set identifier may include a resource set identifier corresponding to the resources of the third sidelink signal. It can be seen that there are multiple ways to configure the sidelink signal by using the first configuration information, and the ways are flexible, thereby improving the flexibility of the solution.

[0036] In a possible implementation, the second signal type includes a sidelink positioning reference signal type. When the second signal type includes a sidelink positioning reference signal type, the determined target transmit power is the transmit power of the first sidelink positioning reference signal, so that the sidelink path loss determined based on the sidelink positioning reference signal can more accurately reflect the environment experienced by the first sidelink positioning reference signal, thereby improving the accuracy of the target transmit power.

[0037] In another possible implementation, the second signal type may further include a PSSCH DMRS type and / or a PSCCH DMRS type. The first terminal device may further measure the PSSCH DMRS and / or the PSCCH DMRS and determine the sidelink pathloss based on the measurement results, thereby improving the flexibility of the solution. Furthermore, if the second signal type does not include a sidelink positioning reference signal, the second terminal device may not need to transmit a sidelink positioning reference signal to determine the sidelink pathloss. As a result, the number of signals transmitted by the second terminal device may be reduced, thereby reducing the power consumption of the first terminal device.

[0038] In another possible implementation, the second configuration information may further include information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. In this way, the flexibility of the solution can be improved.

[0039] The second terminal device may transmit the second configuration information to the first terminal device through the PC5 interface, or may transmit the second configuration information to the network device, so that the network device transmits the second configuration information to the first terminal device. In another possible implementation manner, the second configuration information may alternatively be configured by the network device for the first terminal device. For example, the network device may transmit the second configuration information to the first terminal device (for example, may transmit the second configuration information by using an RRC message).

[0040] Since the first sidelink positioning reference signal and the sidelink signal used for determining the sidelink pathloss may have different frequencies, in a possible implementation, the sidelink pathloss may be determined based on the difference between the frequencies of the first sidelink positioning reference signal and the sidelink signal. In this way, a more accurate sidelink pathloss can be obtained. In a possible implementation, the first terminal device determines the quasi-sidelink pathloss based on the first information, and the first terminal device determines the sidelink pathloss based on the quasi-sidelink pathloss and a first offset, where the first offset is determined based on the difference between the frequency of the sidelink signal associated with the quasi-sidelink pathloss and the frequency of the first sidelink positioning reference signal. For example, the sidelink pathloss is the sum of the sidelink pathloss and the first offset. In this way, the complexity of the solution can be reduced. In another example, the first offset is ΔP1=20lg(f n / f), where ΔP1 represents the first offset and f n where is the frequency of the sidelink signal associated with the quasi-sidelink pathloss and f is the frequency of the first sidelink positioning reference signal. It can be seen that this formula can accurately reflect the difference between the frequency of the sidelink signal associated based on the quasi-sidelink pathloss and the frequency of the first sidelink positioning reference signal.

[0041] In another possible implementation, the first terminal device determines the fifth transmit power based on the second parameter and the sidelink path loss, and the first terminal device determines the second transmit power based on the fifth transmit power and a second offset, where the second offset is determined based on the difference between the frequency of the sidelink signal associated with the sidelink path loss and the frequency of the first sidelink positioning reference signal. In this solution, the process of determining the second transmit power may be adjusted by using the second offset, resulting in a more accurate second transmit power, which in turn improves the accuracy of the target transmit power. For example, the second transmit power may be equal to the sum of the fifth transmit power and the second offset. In this way, the complexity of the solution can be reduced.

[0042] For example, the second offset ΔP2 is ΔP2=α SL 20lg(f n / f), where α SL represents the sidelink path loss adjustment value, and f n where is the frequency of the sidelink signal associated with the quasi-sidelink pathloss and f is the frequency of the first sidelink positioning reference signal. It can be seen that this formula can accurately reflect the difference between the frequency of the sidelink signal associated based on the quasi-sidelink pathloss and the frequency of the first sidelink positioning reference signal.

[0043] In a possible implementation, the power control parameters further include a third transmission power. The third transmission power includes the transmission power of the first terminal device based on the CBR of the resource pool corresponding to the first sidelink positioning reference signal and the transmission priority corresponding to the first sidelink positioning reference signal. In this way, the first terminal device may determine a target transmission power based on the transmission power of the first terminal device under the conditions of the CBR and the transmission priority, so that the determined target transmission power can better match the actual transmission power of the first terminal device. For example, the third transmission power may be conveyed in a sidelink resource pool (SL-resource pool) message.

[0044] In a possible implementation, when the network device does not configure the third transmission power for the first terminal device, the third transmission power is equal to the fourth transmission power, and the fourth transmission power includes the transmission power of the first terminal device. In this way, the target transmission power can be determined based on the transmission power of the terminal device, so that the determined target transmission power is more closely matched to the transmission power of the terminal device.

[0045] In a possible implementation, the first terminal device determines a target transmission power based on the fourth transmission power and the power control parameter, where the fourth transmission power includes the transmission power of the first terminal device. In this way, the target transmission power can be determined based on the transmission power of the terminal device, so that the determined target transmission power is more closely matched to the transmission power of the terminal device.

[0046] In a possible implementation, the first terminal device determines the target transmission power based on the smaller of one or more of the first value, the third transmission power, or the fourth transmission power, where the first value is the smaller of the first transmission power and the second transmission power. For example, the first terminal device determines the target transmission power based on the first transmission power and / or the second transmission power. The first terminal device determines the target transmission power based on the smaller of the first value, the third transmission power, and the fourth transmission power. In this way, the target transmission power can be reduced as much as possible, thereby reducing the power consumption of the terminal device.

[0047] In order to be more compatible with the prior art and to determine the first transmission power more accurately, in a possible implementation, the first transmission power is determined by the following formula:

number

[0048] P PRS,D (i) represents the first transmission power;

number

[0049] In order to be more compatible with the prior art and to determine the first transmission power more accurately, in a possible implementation, the second transmission power is determined by the following formula:

number

[0050] P PRS,SL (i) represents the second transmission power;

number

[0051] In a possible implementation, before the first terminal device determines the target transmission power based on the power control parameter, the first terminal device transmits a second sidelink positioning reference signal, the first terminal device receives a power feedback parameter from the second terminal device, the power feedback parameter being determined based on the received power of the second sidelink positioning reference signal and the received power of the sidelink positioning reference signal that the second terminal device expects to receive, and the first terminal device determines the target transmission power based on the power control parameter and the power feedback parameter. In the solution provided in this embodiment of the present application, the first terminal device may determine the target transmission power based on the power feedback parameter, so that the shortcomings of an open-loop power control mechanism can be compensated for and the target transmission power can be better adjusted through feedback and adjustment.

[0052] In a possible implementation, the first terminal device adjusts the first transmission power based on the power feedback parameter and determines a target transmission power based on the adjusted first transmission power. For example, the first terminal device may multiply the power feedback parameter by a preset coefficient and then add the power feedback parameter to the first transmission power, where the obtained value is the adjusted first transmission power, where the preset coefficient may be equal to or not equal to 1. Since the first terminal device adjusts the first transmission power based on the power feedback parameter, the value of the adjusted first transmission power may be increased, thereby improving the target transmission power and alleviating the problem of insufficient transmission power of the first sidelink positioning reference signal. In other cases, the value of the adjusted first transmission power may be decreased, thereby reducing the target transmission power, thereby reducing the power consumption of the first terminal device and reducing interference between signals.

[0053] In another possible implementation, the first terminal device adjusts the second transmission power based on the power feedback parameter and determines the target transmission power based on the adjusted second transmission power. For example, the first terminal device may multiply the power feedback parameter by a preset coefficient and then add the power feedback parameter to the second transmission power, where the obtained value is the adjusted second transmission power, and the preset coefficient may be equal to or not equal to 1. Since the first terminal device adjusts the second transmission power based on the power feedback parameter, the value of the adjusted second transmission power may be increased, thereby improving the target transmission power and alleviating the problem of insufficient transmission power of the first sidelink positioning reference signal. In another case, the value of the adjusted second transmission power may be decreased, thereby reducing the target transmission power, thereby reducing the power consumption of the first terminal device and reducing interference between signals.

[0054] In another possible implementation, the first terminal device determines a sub-target transmit power based on the first transmit power and / or the second transmit power, and determines the target transmit power based on the sub-target transmit power and the power feedback parameter. For example, the first terminal device may add the power feedback parameter to the sub-target transmit power, or may multiply the power feedback parameter by the sub-target transmit power, and other operating parameters may also be added in the operating process. The first terminal device may adjust the sub-target transmit power based on the power feedback parameter, and then use the obtained value as the transmit power of the first sidelink positioning reference signal. This solution can reduce the complexity of the solution and improve the target transmit power.

[0055] In another possible implementation, the first terminal device adjusts the transmission power of the second SLRM based on the power feedback parameter to obtain a target transmission power, where the transmission power of the second SLRM is determined based on the power control parameter. For example, the first terminal device may add the power feedback parameter to the transmission power of the second SLRM, or may multiply the power feedback parameter by the transmission power of the second SLRM, and other operating parameters may also be added in the operating process. The first terminal device may adjust the transmission power of the second SLRM based on the power feedback parameter and then use the obtained value as the transmission power of the first SLRM. This solution can reduce the complexity of the solution and improve the target transmission power.

[0056] According to a second aspect, this application provides a first communication method. The method may be performed by a network device, or may be performed by a module, unit, or chip inside the network device. In this application, an example in which the method is performed by a network device is used for explanation. The method includes:

[0057] The network device determines a power control parameter, the power control parameter having an association relationship with a resource pool of the sidelink positioning reference signal, and transmits the power control parameter to a first terminal device, the power control parameter being used by the first terminal device to determine a target transmit power for transmitting the first sidelink positioning reference signal.

[0058] The network device indicates the power control parameter to the terminal device, and the power control parameter has an association relationship with the resource pool of the sidelink positioning reference signal. Thus, the first terminal device may determine a more appropriate transmission power of the sidelink positioning reference signal based on the power control parameter, thereby improving the quality of the sidelink positioning reference signal, thereby not only improving the success rate of transmitting the sidelink positioning reference signal, but also ensuring that mutual interference between signals transmitted between terminal devices is reduced as much as possible.

[0059] In a possible implementation manner, the power control parameters may include a first parameter and / or a second parameter. The first parameter includes a third parameter and / or a downlink path loss adjustment factor. The third parameter is an initial power control value based on the downlink path loss of the first terminal device. The second parameter includes a fourth parameter and / or a sidelink path loss adjustment factor, and the fourth parameter is an initial power control value based on the sidelink path loss of the first terminal device. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or a possible implementation manner of the first aspect. Details will not be described again.

[0060] In a possible implementation, the first parameter and / or the second parameter are carried in a Sidelink Resource Pool (SL-resource Pool) message. For related descriptions and beneficial effects, please refer to the first aspect or the related content in the possible implementation of the first aspect. Details will not be described again.

[0061] In a possible implementation, the first parameter and / or the second parameter are carried in a Sidelink Power Control (SL-power control) field in a Sidelink Resource Pool (SL-resource Pool) message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0062] In a possible implementation manner, the network device transmits first configuration information to the second terminal device, the first configuration information indicating information about a sidelink signal used to determine a sidelink pathloss, the first configuration information including at least one of the following: information about a first signal type, a first resource identifier, or a first resource set identifier. For related descriptions and beneficial effects, please refer to the first aspect or the related content in the possible implementation manner of the first aspect. Details will not be described again.

[0063] In a possible implementation, the first signal type includes a sidelink positioning reference signal, a PSSCH DMRS type, and / or a PSCCH DMRS type. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0064] In a possible implementation, the first configuration information further includes information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. For related descriptions and advantageous effects, please refer to the relevant content in the first aspect or possible implementations of the first aspect. Details will not be described again.

[0065] In a possible implementation, the first configuration information is carried in a PC5 RRC message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0066] In a possible implementation, the network device transmits second configuration information to the first terminal device, the second configuration information indicating information about a sidelink signal used to determine a sidelink pathloss, the second configuration information including information about a second signal type, a second resource identifier, and a second resource set identifier. For related descriptions and beneficial effects, please refer to the first aspect or related content in the possible implementation of the first aspect. Details will not be described again. The second signal type is a type of sidelink signal used to determine a sidelink pathloss. The second signal type includes a sidelink positioning reference signal type. The second resource identifier includes a resource identifier of a third sidelink signal. The second resource set identifier includes a resource set identifier corresponding to resources of the third sidelink signal.

[0067] In a possible implementation, the second signal type further includes a PSSCH DMRS type and / or a PSCCH DMRS type. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0068] In a possible implementation, the second configuration information further includes information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. For related descriptions and advantageous effects, please refer to the relevant content in the first aspect or possible implementations of the first aspect. Details will not be described again.

[0069] In a possible implementation, the second configuration information is carried in a PC5 RRC message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0070] In a possible implementation, the power control parameters further include a third transmission power, the third transmission power being determined based on a CBR of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal. For related descriptions and beneficial effects, please refer to the first aspect or the related content of the possible implementation of the first aspect. Details will not be described again.

[0071] In a possible implementation, the third transmission power is carried in a sidelink resource pool (SL-resource Pool) message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0072] In a possible implementation, the power control parameter includes a fourth transmission power, and the fourth transmission power includes the transmission power of the network device. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0073] According to a third aspect, this application provides a first communication method. The method may be performed by a second terminal device, or may be performed by a module, unit, or chip inside the second terminal device. In this application, an example in which the method is performed by the second terminal device is used for explanation. The method includes:

[0074] The second terminal device generates first information, the first information including information on the received power of a sidelink signal from the first terminal device or information on a sidelink pathloss, or information on the transmit power of a sidelink signal transmitted by the second terminal device, and transmits the first information to the first terminal device, where the first information is used by the first terminal device to determine the sidelink pathloss.

[0075] In this solution, the sidelink pathloss is determined based on information transmitted between the first terminal device and the second terminal device over the sidelink, thereby improving the accuracy of the sidelink pathloss.

[0076] In a possible implementation manner, when the first information includes information regarding the received power of the sidelink signal from the first terminal device, the first information further includes a resource identifier of the sidelink signal from the first terminal device or a resource set identifier corresponding to the resource of the sidelink signal from the first terminal device. For related descriptions and beneficial effects, please refer to the related content in the first aspect or the possible implementation manner of the first aspect. Details will not be described again.

[0077] In a possible implementation, the first information may include one of the following: information on the received power of a first sidelink signal, the first sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and the type of the first sidelink signal including a sidelink positioning reference signal; information on the received power of a second sidelink signal, the second sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and the type of the second sidelink signal including a PSSCH DMRS or a PSCCH DMRS; or information on a sidelink pathloss, the information on the sidelink pathloss being determined based on the first sidelink signal or the second sidelink signal. For related descriptions and advantageous effects, please refer to the first aspect or the related content in the possible implementation of the first aspect. Details will not be described again.

[0078] In a possible implementation manner, before the second terminal device generates the first information, the second terminal device receives first configuration information, the first configuration information indicating information about a sidelink signal used to determine a sidelink pathloss, the first configuration information including at least one of: information about a first signal type, the first signal type being a type of sidelink signal used to determine a sidelink pathloss, the first signal type including a sidelink positioning reference signal type; a first resource identifier, the first resource identifier including a resource identifier of the first sidelink signal; or a first resource set identifier, the first resource set identifier including a resource set identifier corresponding to a resource of the first sidelink signal. For related descriptions and beneficial effects, please refer to the first aspect or the related content in the possible implementation manner of the first aspect. Details will not be described again.

[0079] In a possible implementation, the first signal type further includes a PSSCH DMRS type and / or a PSCCH DMRS type. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0080] In a possible implementation, the first configuration information further includes information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. For related descriptions and advantageous effects, please refer to the relevant content in the first aspect or possible implementations of the first aspect. Details will not be described again.

[0081] In a possible implementation, the first configuration information is carried in a PC5 RRC message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0082] In a possible implementation manner, the first information includes information regarding a transmission power of a third sidelink signal, the third sidelink signal being from the second terminal device, and a type of the third sidelink signal including a sidelink positioning reference signal, and the method further includes transmitting the third sidelink signal from the second terminal device before the second terminal device generates the first information. For related descriptions and advantageous effects, please refer to the first aspect or the related content in the possible implementation manner of the first aspect. Details will not be described again.

[0083] In a possible implementation, the first information includes information regarding the transmit power of a fourth sidelink signal, the fourth sidelink signal being from a second terminal device, the third sidelink signal including a sidelink positioning reference signal, the type of the fourth sidelink signal including a PSSCH DMRS or a PSCCH DMRS, and the second terminal device transmitting the fourth sidelink signal before generating the first information. For related descriptions and beneficial effects, please refer to the first aspect or the related content in the possible implementation of the first aspect. Details will not be described again.

[0084] In a possible implementation, the second terminal device transmits second configuration information to the first terminal device, the second configuration information indicating information about sidelink signals used for determining sidelink pathloss, the second configuration information including at least one of: information about a second signal type, the second signal type being a type of sidelink signal used for determining sidelink pathloss, the second signal type including a sidelink positioning reference signal type; a second resource identifier, the second resource identifier including a resource identifier of a third sidelink signal; or a second resource set identifier, the second resource set identifier including a resource set identifier corresponding to a resource of the third sidelink signal. For related descriptions and beneficial effects, please refer to the first aspect or the related content in the possible implementation of the first aspect. Details will not be described again.

[0085] In a possible implementation, the second signal type further includes a PSSCH DMRS type and / or a PSCCH DMRS type. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0086] In a possible implementation, the second configuration information further includes information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss, and / or information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. For related descriptions and advantageous effects, please refer to the relevant content in the first aspect or possible implementations of the first aspect. Details will not be described again.

[0087] In a possible implementation, the second configuration information is carried in a PC5 RRC message. For related descriptions and beneficial effects, please refer to the relevant content in the first aspect or the possible implementation of the first aspect. Details will not be described again.

[0088] According to a fourth aspect, there is provided a communication device. The communication device may be a first terminal device, a network device, or a second terminal device. The communication device may include a communication unit and a processing unit for performing any one of the implementation manners of any of the methods in the first to third aspects. The communication unit is configured to perform functions related to transmission and reception. Optionally, the communication unit includes a receiving unit and a transmitting unit. In a design, the communication device is a communication chip, and the processing unit may be one or more processors or processor cores, and the communication unit may be input / output circuits or ports of the communication chip.

[0089] In other designs, the communication unit may be a transmitter and a receiver, or the communication unit may be a transmitter machine and a receiver machine.

[0090] Optionally, the communication device further includes a module that may be configured to execute any one of the implementation methods of any of the methods in the first to third aspects.

[0091] According to a fifth aspect, there is provided a communication device. The communication device may be a first terminal device, a network device, or a second terminal device, and may include a processor and a memory. Optionally, the communication device further includes a transceiver. The memory is configured to store a computer program or instructions. The processor is configured to retrieve the computer program or instructions from the memory and execute the computer program or instructions. When the processor executes the computer program or instructions in the memory, the communication device is capable of performing any one of the implementations of any of the methods in the first to third aspects.

[0092] Optionally, there are one or more processors and one or more memories.

[0093] Optionally, the memory may be integrated with the processor, or the memory and processor may be located separately.

[0094] Optionally, the transceiver may include a transmitter machine and a receiver machine.

[0095] According to a sixth aspect, there is provided a communication device. The communication device may be a first terminal device, a network device, or a second terminal device, and the communication device may include a processor. The processor may be coupled to a memory and configured to execute a method according to any one of the first to third aspects and any one of possible implementation manners of the first to third aspects. Optionally, the communication device further includes the memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

[0096] In an implementation, when the communication device is a wireless communication device, the communication interface may be a transceiver or an input / output interface. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0097] In other implementations, when the communication device is a chip or chip system, the communication interface may be an input / output interface, interface circuitry, output circuitry, input circuitry, pins, associated circuitry, etc. on the chip or chip system. The processor may alternatively be embodied as a processing circuit or logic circuitry.

[0098] According to a seventh aspect, there is provided a system including a first terminal device, a network device, and a second terminal device.

[0099] According to an eighth aspect, there is provided a computer program product. The computer program product includes a computer program (which may also be referred to as code or instructions). When the computer program is executed, the computer is enabled to perform a method according to any one of the possible implementations of the first aspect, or the computer is enabled to perform a method according to any one of the implementations of the first to third aspects.

[0100] According to a ninth aspect, there is provided a computer-readable storage medium. The computer-readable medium stores a computer program (which may also be referred to as code or instructions). When the computer program is executed on a computer, the computer is enabled to perform a method according to any one of the possible implementations of the first aspect, or the computer is enabled to perform a method according to any one of the implementations of the first to third aspects.

[0101] According to a tenth aspect, there is provided a chip system. The chip system may include a processor. The processor may be coupled to a memory and configured to execute a method according to any one of the first to third aspects and any one of the possible implementations of any one of the first to third aspects. Optionally, the chip system further includes a memory. The memory is configured to store a computer program (which may also be referred to as code or instructions). The processor is configured to call the computer program from the memory and execute the computer program to enable a device in which the chip system is installed to execute a method according to any one of the first to third aspects and any one of the possible implementations of any one of the first to third aspects.

[0102] According to an eleventh aspect, there is provided a communication device. The communication device may be a first terminal device or a second terminal device, and may include an interface circuit and a processing circuit. The interface circuit may include an input circuit and an output circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, thereby realizing a method according to any one of the first to third aspects and any one of the possible implementation manners of any one of the first to third aspects.

[0103] In a particular implementation, the processing unit may be a chip, the input circuits may be input pins, the output circuits may be output pins, and the processing circuits may be transistors, gate circuits, triggers, various logic circuits, etc. An input signal received by an input circuit may be, for example, but not limited to, received and input by a receiver, and a signal output by an output circuit may be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit may be the same circuit, or a circuit may be used as an input circuit and an output circuit at different times. The particular implementation of the processor and various circuits is not limited by this application.

[0104] In an implementation, when the communication apparatus is a wireless communication device, the wireless communication device may be a terminal, for example, a smartphone, or a radio access network device, for example, a base station. The interface circuit may be a radio frequency processing chip in the wireless communication device, and the processing circuit may be a baseband processing chip in the wireless communication device.

[0105] In other implementations, the communication unit may be several components within a wireless communication device, such as an integrated circuit product, such as a system chip or a communication chip. The interface circuit may be an input / output interface, interface circuit, output circuit, input circuit, pin, associated circuit, etc. on a chip or chip system. The processing circuit may be a logic circuit on a chip. [Brief explanation of the drawings]

[0106] [Figure 1] 1A-1C are diagrams of some possible system architectures to which embodiments of the present application are applicable. [Figure 2] 1 is a diagram of a possible system architecture to which embodiments of the present application are applicable; [Figure 3] 1 is a possible schematic flowchart of a communication method according to an embodiment of the present application; [Figure 4] 1 is a possible schematic flowchart of a method for determining sidelink path loss according to an embodiment of the present application; [Figure 5] 1 is a possible schematic flowchart of a method for determining sidelink path loss according to an embodiment of the present application; [Figure 6] 1 is a possible schematic flowchart of another communication method according to an embodiment of the present application. [Figure 7] 1 is a diagram of a possible communication device structure according to an embodiment of the present application; [Figure 8] 10 is a diagram of another possible communication device structure according to an embodiment of the present application. [Figure 9]10 is a diagram of another possible communication device structure according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0107] The technical solutions provided in the embodiments of this application are mainly applicable to wireless communication systems. The wireless communication system may comply with the wireless communication standard of the 3rd generation partnership project (3GPP). For example, the solutions provided in the embodiments of this application may be applied to a fourth generation (4G) communication system, such as a long term evolution (LTE) communication system, a fifth generation (5G) communication system, such as a 5G new radio (NR) communication system, or various future communication systems, such as a sixth generation (6G) communication system. th generation (6G) communication systems. Alternatively, the technical solutions provided in the embodiments of this application may comply with other wireless communication standards, such as the Institute of Electrical and Electronics Engineers (IEEE) 802 series (e.g., 802.11, 802.15, or 802.20) wireless communication standards.

[0108] The method provided in the embodiments of this application may further be applied to a Bluetooth system, a Wi-Fi system, a LoRa system, or a vehicle-to-everything (V2X) system. The method provided in the embodiments of this application may further be applied to a satellite communication system, and the satellite communication system may be integrated with the above communication systems.

[0109] Figure 1 is a diagram example of some possible system architectures to which the embodiments of this application can be applied. In Figure 1, two terminal devices and one network device are used as an example for explanation. The communication system may further include more terminal devices and network devices.

[0110] FIG. 1(a) shows an architecture within the coverage of a network device. A PC5 connection is established between terminal devices, and each terminal device establishes a connection with a network device (e.g., a base station). It should be understood that the terminal devices may be connected to the same base station or different base stations. In FIG. 1(a), an example in which the terminal devices are connected to the same base station is used for explanation. In an embodiment of this application, a connection may be established between the terminal device and the base station through a Uu interface. The first terminal device and the second terminal device in the solution provided in the embodiment of this application may be terminal devices within the coverage of the network device shown in FIG. 1(a).

[0111] (b) in Figure 1 shows an architecture within a portion of the coverage of a network device. A PC5 connection is established between terminal devices, and some of the terminal devices do not establish a connection to a network device (e.g., a base station), while the remaining portion of the terminal devices establish a connection to a network device (e.g., a base station). In the solution provided in the embodiment of this application, some of the first terminal devices and the second terminal devices (e.g., the first terminal devices) may be terminal devices within the coverage of the network device shown in (b) in Figure 1, and other portions of the first terminal devices and the second terminal devices (e.g., the second terminal devices) may be terminal devices outside the coverage of the network device in (b) in Figure 1.

[0112] (c) in Fig. 1 shows an architecture outside the coverage of the network device. A PC5 connection is established between the terminal devices, and not all the terminal devices establish a connection to the network device. Some or all of the first terminal device and the second terminal device in the solution provided in the embodiment of this application may be terminal devices outside the coverage of the network device shown in (c) in Fig. 1.

[0113] In the above scenario, since the first terminal device and the second terminal device are in a moving state, when moving into the coverage of the network device, the first terminal device and / or the second terminal device may communicate with the network device to transmit some information, parameters, etc. In another possible implementation manner, for example, if the first terminal device does not move into the coverage of the network device within a certain period of time (when the first terminal device is located outside the coverage of the network device), the first terminal device may then determine the transmission power of the first sidelink positioning reference signal based on Equation (1) provided in the embodiments of this application. For example, the transmission power of the first terminal device (e.g., the maximum transmission power of the first terminal device) may be determined as the transmission power of the first sidelink positioning reference signal. It can be understood that in the solution provided in the embodiments of this application, the first terminal device and / or the second terminal device may be located outside the coverage of the network device or within the coverage of the network device.

[0114] 2 is a diagram example of a possible network architecture to which the embodiments of this application are applicable, by using a 5G network architecture as an example. As shown in FIG. 2, the possible network architecture to which this application is applicable includes three parts: a terminal device (e.g., UE1 and UE2 shown in FIG. 2), an access network device (e.g., a next generation (NG) radio access network ((R)AN) device), and a core network.

[0115] (1) Terminal Device In this embodiment of the present application, a terminal device (for example, UE1 and UE2 shown in FIG. 2) may include a user equipment (UE)-location management component (LMC). The UE-LMC may be a component or application deployed on the terminal device and having some LMF functions, and is configured to support positioning services of the PC5 interface. The LMC in each terminal device in FIG. 2 is shown as a dashed line to indicate that the terminal device side may or may not include an LMC. In FIG. 2, an example is used in which both of the two terminal devices include an LMC.

[0116] The terminal device shown in Figure 2 in this embodiment of this application (for example, UE1 or UE2 shown in Figure 2) may be a terminal device in the communication system shown in Figure 1. For example, UE1 and UE2 may be two terminal devices located within the coverage of a network device and shown in (a) in Figure 1. In another example, some of the terminal devices of UE1 and UE2 may be terminal devices located within the coverage of a network device and shown in (b) in Figure 1, and other parts of the terminal devices of UE1 and UE2 may be terminal devices located outside the coverage of the network device and shown in (b) in Figure 1. UE1 and UE2 may be two terminal devices located outside the coverage of a network device and shown in (c) in Figure 1.

[0117] The terminal devices in the embodiments of this application (e.g., UE1 and UE2 shown in FIG. 2 and the first terminal device and the second terminal device in the embodiments of this application) may include devices that provide voice and / or data connections to users, and may include, for example, handheld devices with wireless connection capabilities or processing devices connected to wireless modems. The terminal devices may communicate with a core network through a radio access network (RAN) and exchange voice and / or data with the RAN. The terminal device may be a user equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device (D2D) terminal device, a vehicle-to-everything (V2X) terminal device (V2X may specifically include several application requirements such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication and interaction), a machine-to-machine / machine-type communications (M2M / MTC) terminal device, an internet of things (IoT) terminal device, a subscriber unit, a subscriber station, a mobile station, a remote station, an access point, a It may also include an AP, a remote terminal, an access terminal, a user terminal, a user agent, a user device, etc.For example, a terminal device may include a mobile phone (also called a "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-embedded mobile device, etc. For example, a terminal device may be a device such as a personal communication service (PCS) phone, a cordless telephone set, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, or a personal digital assistant (PDA). Alternatively, a terminal device may be a tablet computer or a computer with wireless transceiver functionality. Alternatively, a terminal device may be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. The terminal device alternatively includes a limited device, such as a device with low power consumption, a device with limited storage capability, or a device with limited computing capability. For example, the terminal device includes an information sensing device such as a barcode, radio frequency identification (RFID), sensor, global positioning system (GPS), or laser scanner.

[0118] By way of example and not limitation, in the embodiments of this application, the terminal device may alternatively be a wearable device. A wearable device may also be referred to as a wearable intelligent device, an intelligent wearable device, etc., and is a general term for wearable devices, such as glasses, gloves, watches, clothes, and shoes, that are intelligently designed and developed for everyday wear by using wearable technology. A wearable device is a portable device that can be worn directly on the body or integrated into a user's clothing or accessories. A wearable device is not only a hardware device, but also realizes powerful functions through software support, data exchange, and cloud interaction. In a broad sense, a wearable intelligent device includes a full-featured large device, such as a smart watch or smart glasses, that can realize all or part of its functions without relying on a smartphone, and a device that focuses only on a specific type of application function and needs to operate in cooperation with other devices such as a smartphone, such as various smart bands, smart helmets, or smart jewelry for monitoring physical symptoms.

[0119] When the above various terminal devices are located in a vehicle (e.g., arranged or installed in a vehicle), the terminal devices may all be considered as on-board terminal devices. For example, the on-board terminal device may also be called an on-board unit (OBU). The terminal device in the embodiments of this application may alternatively be a vehicle-mounted module, on-board unit, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit that is incorporated into the vehicle as one or more components or units. The vehicle implements the method in this application using the vehicle-mounted module, vehicle-mounted component, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit incorporated into the vehicle.

[0120] In an embodiment of this application, the terminal device may further include a relay. Alternatively, it is understood that any device capable of performing data communication with a base station may be considered a terminal device.

[0121] The terminal device in the embodiments of this application may be understood as a device, or may be a module configured to realize the function of the terminal device. The module may be disposed in the terminal device or may be disposed independently of the terminal device. The module is, for example, a chip system.

[0122] (2) Network Devices The network devices may include access network devices and / or core network devices.

[0123] (2.1) Access Network Devices An access network (AN) device (e.g., a base station) may be a device that communicates with wireless terminal devices over the air interface within an access network through one or more cells. For example, an access network device may include an evolved NodeB (eNB, e-NodeB, or evolved NodeB) in an LTE system or a long term evolution-advanced (LTE-A) system, a next generation NodeB (gNB) in a fifth generation (5G) new radio (NR) system, or a central unit (CU) and a distributed unit (DU) in a cloud radio access network (Cloud RAN) system. This is not limited to the embodiments of this application.

[0124] eNBs may include various types of macro base stations, micro base stations (also called small cells), relay stations, access points, wearable devices, and vehicle-mounted devices. An eNB may also be a Transmission Reception Point (TRP).

[0125] The gNB may include various types of macro base stations, micro base stations (also called small cells), relay stations, access points, wearable devices, and vehicle-mounted devices. The gNB may also be a TRP or Transmission Measurement Function (TMF). The gNB may include a CU and DU integrated into the gNB.

[0126] A terminal device may communicate with a serving base station through a Uu link. For example, a terminal device may communicate with an Ng-eNB through an LTE-Uu link or with a gNB through an NR-Uu link. The Ng-eNB is an LTE base station, and the gNB is an NR base station. The base stations may communicate with each other through an Xn interface.

[0127] (2.2) Core Network Devices Positioning-related network elements in the core network mainly include an access and mobility management function (AMF) network element, a location management function (LMF) network element, etc. The network elements may further include an evolved serving mobile location center (E-SMLC) network element, a unified data management (UDM) network element, and an application function (AF) network element. The base station may communicate with the AMF network element through an NG-C interface, and the AMF network element may be equivalent to a router for communication between the gNB and the LMF.

[0128] The LMF network element may estimate the location of the terminal device, and the AMF communicates with the LMF over the NL interface.

[0129] The location management device in the embodiment of this application may be the LMF, UE-LMC, etc. in Fig. 2, or may be a network element having the function of the LMF or UE-LMC in a future communication network such as a 6th generation (6G) network, which is not limited in this application.

[0130] (3) Transmission mode between terminal devices For the transmission mode between terminal devices, the current standard protocol supports a broadcast mode, a multicast mode and a unicast mode.

[0131] Broadcast mode: The broadcast mode means that a terminal device functioning as a transmitter transmits data in a broadcast mode, and all of the terminal devices can receive sidelink control information (SCI) or a sidelink shared channel (SSCH) from the transmitter.

[0132] The scheme for ensuring that all terminal devices can interpret the control information from the transmitting end on the sidelink is as follows: The transmitting end either does not scramble the control information or scrambles the control information by using a scrambling code known to all terminal devices.

[0133] Multicast mode: The multicast mode is similar to the broadcast mode. A terminal device acting as a sender transmits data in broadcast mode. A group of terminal devices can parse the SCI or SSCH.

[0134] Unicast mode: In unicast mode, a terminal device transmits data to other terminal devices, and the other terminal devices do not need or can interpret the data.

[0135] (4) Sidelink: A sidelink is a link between terminal devices. An uplink is a link between a terminal device and a network device.

[0136] In some applications, the network device may configure a resource pool for transmission data and / or transmission signals. For example, the network device may configure a resource pool for a PSSCH of a first terminal device, where resources in the resource pool are used by the first terminal device to transmit the PSSCH. In another example, the network device may configure a resource pool for a sidelink positioning reference signal of a first terminal device, where resources in the resource pool are used by the first terminal device to transmit the sidelink positioning reference signal.

[0137] Furthermore, the network device may further configure parameters for the resource pool. For example, the network device configures parameters for the resource pool of the PSSCH (e.g., parameters used to perform power control on the PSSCH). When the first terminal device needs to perform power control on the transmitted PSSCH, the first terminal device may determine the transmission power of the PSSCH based on the configured parameters for the resource pool of the PSSCH, so that the quality of the PSSCH can be improved, thereby not only improving the success rate of transmitting the PSSCH but also reducing the mutual interference of the PSSCH transmitted between terminal devices as much as possible.

[0138] In practical applications, the resource pools configured by the network device may be different. For example, the resource pool configured by the network device for the PSSCH of the first terminal device may be different from the resource pool configured for the sidelink positioning reference signal of the first terminal device. One of the parameters configured by the network device for the resource pool of the PSSCH may be the same as or different from the parameter (e.g., power control parameter) configured by the network device for the resource pool of the sidelink positioning reference signal. There is not necessarily a relationship between the two parameters. If the transmission power of the sidelink positioning reference signal is still determined based on the parameter configured by the network device for the resource pool of the PSSCH, the transmission power of the sidelink positioning reference signal will not be determined properly.

[0139] For the above problem, this embodiment of the present application provides a possible implementation scheme. In this implementation scheme, a network device transmits power control parameters having an association relationship with a resource pool of a sidelink positioning reference signal to a first terminal device, and the first terminal device determines the sidelink positioning reference signal based on the power control parameters. Compared with a scheme in which configuration parameters of another resource pool (e.g., a resource pool of a PSSCH) are used to determine the sidelink positioning reference signal, this scheme can more appropriately determine the transmission power of the sidelink positioning reference signal, thereby improving the quality of the sidelink positioning reference signal, thereby not only improving the success rate of transmitting the sidelink positioning reference signal but also minimizing mutual interference between signals transmitted between terminal devices. The solution provided in the embodiment of the present application is further described below with reference to the accompanying drawings.

[0140] Based on the embodiments shown in Figures 1 and 2 and other contents described above, Figure 3 is an example of a possible schematic flowchart of a communication method according to an embodiment of this application. The method is illustrated by using an example in which the execution entities are a first terminal device, a second terminal device, and a network device. In practical application, the solution executed on the first terminal device side may also be executed by a unit, module, or chip inside the first terminal device, the solution executed on the second terminal device side may also be executed by a unit, module, or chip inside the second terminal device, and the solution executed on the network device side may also be executed by a unit, module, or chip inside the network device.

[0141] The first terminal device and the second terminal device in FIG. 3 may be the two terminal devices in the above scenario in FIG. 1. For example, the first terminal device and the second terminal device in this embodiment of the present application may be two terminal devices located within the coverage of the network device and shown in (a) of FIG. 1. In another example, in this embodiment of the present application, either the first terminal device or the second terminal device (e.g., the first terminal device) may be one terminal device located within the coverage of the network device and shown in (b) of FIG. 1, and the other of the first terminal device and the second terminal device (e.g., the second terminal device) may be one terminal device located outside the coverage of the network device and shown in (b) of FIG. 1. The second terminal device does not establish a connection to the network device, and the first terminal device establishes a connection to the network device. In another example, the first terminal device and the second terminal device in this embodiment of the present application may be two terminal devices located outside the coverage of the network device and shown in (c) of FIG. 1. The first terminal device and the second terminal device in FIG. 3 may be UE1 and UE2 in FIG.

[0142] The network device in Figure 3 may be the network device shown in Figure 1, or may be the network device in Figure 2, such as the access network device and / or the core network device shown in Figure 2. This is not limited in this embodiment of the application.

[0143] As shown in FIG. 3, the method includes the following steps:

[0144] Step 301: A network device determines power control parameters.

[0145] The power control parameters have an association relationship with the resource pool of the sidelink positioning reference signal.

[0146] The power control parameter is used by the first terminal device to determine a target transmit power for transmitting the first sidelink positioning reference signal.

[0147] Step 302: The network device sends power control parameters to the first terminal device.

[0148] In response, the first terminal device receives a power control parameter from the network device.

[0149] Step 303: The first terminal device determines a target transmission power based on the power control parameters.

[0150] Step 304: The first terminal device transmits a first sidelink positioning reference signal based on a target transmit power.

[0151] A sidelink positioning reference signal (e.g., a first sidelink positioning reference signal or a second sidelink positioning reference signal) in this embodiment of the application may be understood as a signal that can be used for positioning and that is transmitted between terminal devices, or as a signal that is used for positioning and that is transmitted between sidelinks of terminal devices.

[0152] The sidelink positioning reference signal in this embodiment of the application may be a sidelink positioning reference signal (PRS), or a sounding reference signal (SRS), or a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a phase-tracking reference signal (PTRS), or a sidelink synchronization signal / physical sidelink broadcast channel block (S-SS / PSBCH block).

[0153] In this embodiment of the present application, a network device configures a resource pool for a sidelink positioning reference signal of a first terminal device, and resources in the resource pool are used by the first terminal device to transmit the sidelink positioning reference signal. The network device configures parameters for the resource pool, and the power control parameter is a parameter among the parameters configured by the network device for the resource pool. The network device instructs the terminal device about the power control parameter, and the power control parameter has an association relationship with the resource pool for the sidelink positioning reference signal. Therefore, the first terminal device may determine a more appropriate transmission power for the sidelink positioning reference signal based on the power control parameter, thereby improving the quality of the sidelink positioning reference signal, thereby not only improving the success rate of transmitting the sidelink positioning reference signal but also reducing mutual interference between signals transmitted between terminal devices as much as possible.

[0154] The power control parameters in this embodiment of the present application may include one or more of the first parameter, the second parameter, and the third transmission power. Separate descriptions are provided below.

[0155] (1) First parameter The first parameter includes the third parameter and / or a downlink path loss adjustment factor.

[0156] The third parameter is an initial power control value based on the downlink path loss of the first terminal device. In a possible implementation, the third parameter may be understood as an initial power control value of the transmitting end of the first sidelink positioning reference signal based on the downlink path loss, or as a received power value of one of the sidelink positioning reference signals expected by the receiving end of the first sidelink positioning reference signal. The third parameter may be indicated by a parameter (the parameter may have multiple names, for example, the parameter may be called dl-P0-SLPRS) delivered by the network device.

[0157] The downlink path loss adjustment factor may be used to adjust the downlink path loss when the first transmit power is calculated based on the first parameter. The downlink path loss adjustment factor may be indicated by a parameter (the parameter may have multiple names, for example, the parameter may be called dl-Alpha-SLPRS) delivered by the network device. The downlink path loss adjustment factor may also be called by other names, for example, a filter parameter, a downlink path filter parameter, etc. This is not limited in this embodiment of the application.

[0158] Since the first parameter includes the third parameter and / or the downlink path loss adjustment factor, the first terminal device may consider the influence of the downlink path loss in the process of determining the target transmission power, so that the target transmission power can be more appropriately determined. Furthermore, the downlink path loss obtained through measurement may be adjusted based on the downlink path loss adjustment factor, so that the target transmission power can be more appropriately determined.

[0159] The first parameter (e.g., the third parameter and / or the downlink path loss adjustment factor) may be carried in a sidelink resource pool (SL-resource pool) message. For example, the first parameter may be carried in a sidelink power control (SL-power control) field in the sidelink resource pool (SL-resource pool) message. In this way, this is more compatible with the prior art. For example, the parameter dl-P0-SLPRS and / or the parameter dl-Alpha-SLPRS may be carried in the sidelink power control (SL-power control) field. The first terminal device may determine the third parameter based on the received parameter dl-P0-SLPRS. The first terminal device may determine the downlink path loss adjustment factor based on the received parameter dl-Alpha-SLPRS.

[0160] In a possible implementation, the network device does not configure a downlink path loss adjustment factor for the first terminal device. For example, the network device does not configure a downlink path loss adjustment factor for a resource pool of sidelink positioning reference signals. In another example, the network device does not transmit a downlink path loss adjustment factor to the first terminal device (the network device may or may not configure a downlink path loss adjustment factor for a resource pool of sidelink positioning reference signals). In another example, the sidelink resource pool (SL-resource pool) message transmitted by the network device to the first terminal device does not include the parameter dl-Alpha-SLPRS. In another example, the first terminal device cannot determine the downlink path loss adjustment factor from the parameter dl-Alpha-SLPRS transmitted by the network device. For example, the parameter dl-Alpha-SLPRS indicates one preset value. When the network device does not instruct the first terminal device of a downlink path loss adjustment factor, in a possible implementation, the first terminal device may determine that the downlink path loss adjustment factor is 1. In this way, when the network device does not configure the downlink path loss adjustment factor, the first terminal device may determine the target transmission power based on the downlink path loss obtained through measurement. In this way, the target transmission power can be determined based on the maximum impact that the downlink path loss may cause to avoid interference with uplink signal transmission, so that the target transmission power is more appropriate.

[0161] (2) Second parameter The second parameter includes the fourth parameter and / or a sidelink path loss adjustment factor.

[0162] The fourth parameter is an initial power control value based on the sidelink path loss of the first terminal device. In a possible implementation, the fourth parameter may be understood as an initial power control value of the transmitting end of the first sidelink positioning reference signal based on the sidelink path loss, or as another received power value of the sidelink positioning reference signal expected by the receiving end of the first sidelink positioning reference signal. The fourth parameter is the received power of the sidelink positioning reference signal expected by the receiving end of the first sidelink positioning reference signal. The fourth parameter may be indicated by a parameter (the parameter may have multiple names, for example, the parameter may be called sl-P0-SLPRS) delivered by the network device.

[0163] The sidelink path loss adjustment factor may be used to adjust the sidelink path loss when the second transmission power is calculated based on the second parameter. The sidelink path loss adjustment factor may be indicated by a parameter delivered by the network device (the parameter may have multiple names, for example, the parameter may be called sl-Alpha-SLPRS). The sidelink path loss adjustment factor may also be called by other names, for example, a filter parameter, a sidelink path filter parameter, etc. This is not limited in this embodiment of the application.

[0164] The second parameter (e.g., the fourth parameter and / or the sidelink path loss adjustment factor) may be carried in a sidelink resource pool (SL-resource pool) message. For example, the second parameter may be carried in a sidelink power control (SL-power control) field in the sidelink resource pool (SL-resource pool) message. In this way, this is more compatible with the prior art. For example, the parameter sl-P0-SLPRS and / or the parameter sl-Alpha-SLPRS may be carried in the sidelink power control (SL-power control) field. The first terminal device may determine the fourth parameter based on the received parameter sl-P0-SLPRS. The first terminal device may determine the sidelink path loss adjustment factor based on the received parameter sl-Alpha-SLPRS.

[0165] Since the first parameter includes the fourth parameter and / or the sidelink path loss adjustment factor, in the process of determining the transmission power of the sidelink positioning reference signal, the first terminal device may take into account the effect of the sidelink path loss, so as to more appropriately determine the transmission power of the sidelink positioning reference signal. Furthermore, the sidelink path loss obtained through measurement may be adjusted based on the sidelink path loss adjustment factor, so as to more appropriately obtain the transmission power of the sidelink positioning reference signal, thereby reducing interference between terminal devices.

[0166] In a possible implementation, the network device does not configure a sidelink pathloss adjustment factor for the first terminal device. For example, the network device does not configure a sidelink pathloss adjustment factor for a resource pool of sidelink positioning reference signals. In another example, the network device does not transmit a sidelink pathloss adjustment factor to the first terminal device (the network device may or may not configure a sidelink pathloss adjustment factor for a resource pool of sidelink positioning reference signals). In another example, the sidelink resource pool (SL-resource pool) message transmitted by the network device to the first terminal device does not include the parameter sl-Alpha-SLPRS. In another example, the first terminal device cannot determine the sidelink pathloss adjustment factor from the parameter sl-Alpha-SLPRS transmitted by the network device. For example, the parameter sl-Alpha-SLPRS indicates one preset value. When the network device does not indicate a sidelink pathloss adjustment factor to the first terminal device, in a possible implementation, the first terminal device may determine that the sidelink pathloss adjustment factor is 1. In this way, when the network device does not configure a sidelink pathloss adjustment factor, the first terminal device may determine the target transmission power based on the sidelink pathloss obtained through measurements. In this way, the target transmission power can be determined based on the maximum impact that may be caused by the sidelink pathloss, thereby making the target transmission power more appropriate.

[0167] (3) Third transmission power The third transmit power includes a transmit power of the first terminal device based on a CBR of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal. In this way, the first terminal device may determine a target transmit power based on the transmit power of the first terminal device under the conditions of the CBR and the transmission priority, so that the determined target transmit power can better match the actual transmit power of the first terminal device.

[0168] For example, the third power may be a maximum transmit power of the first terminal device based on a CBR of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal. The third transmit power may be indicated by a parameter delivered by the network device (the parameter may have multiple names, for example, the parameter may be called sl-MaxTxPower-SLPRS).

[0169] The third transmission power may be carried in a sidelink resource pool (SL-resource pool) message. For example, a parameter sl-MaxTxPower-SLPRS may be carried in the sidelink resource pool (SL-resource pool) message. The first terminal device may determine the third transmission power based on the received parameter sl-MaxTxPower-SLPRS.

[0170] In a possible implementation, the network device does not configure a third transmission power for the first terminal device. For example, the network device does not configure a third transmission power for the resource pool of the sidelink positioning reference signal. In another example, the network device does not transmit a third transmission power to the first terminal device (the network device may or may not configure a third transmission power for the resource pool of the sidelink positioning reference signal). In another example, the sidelink resource pool (SL-resource pool) message transmitted by the network device to the first terminal device does not include the parameter sl-MaxTxPower-SLPRS. In another example, the first terminal device cannot determine the third transmission power from the parameter sl-MaxTxPower-SLPRS transmitted by the network device. For example, the parameter sl-MaxTxPower-SLPRS indicates a preset value.

[0171] When the network device does not instruct the first terminal device to the third transmission power, in a possible implementation, the first terminal device may not consider the third transmission power when determining the target transmission power. In another possible implementation, the first terminal device may determine that the third transmission power is equal to the fourth transmission power. The fourth transmission power includes the transmission power of the first terminal device. For example, the fourth transmission power includes the maximum transmission power of the first terminal device. In this manner, the target transmission power can be determined based on the transmission power of the terminal device, so that the determined target transmission power more closely matches the transmission power of the terminal device. In this embodiment of the present application, the fourth transmission power may be configured for the first terminal device. The first terminal device may know the fourth transmission power from configuration information of the first terminal device. Alternatively, the fourth transmission power may be instructed to the first terminal device by another device (e.g., a network device).

[0172] In step 303, the first terminal device determines a target transmission power based on the power control parameters. Specifically, for example, the first terminal device may determine the target transmission power based on one or more of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power.

[0173] The first transmission power is determined based on the first parameter and the downlink path loss. Thus, in the process of determining the target transmission power, the first terminal device may take into account the influence caused by the downlink path, so that a more appropriate target transmission power can be determined, thereby avoiding the influence of the uplink signal transmission. In another example, the first transmission power is determined based on the first parameter, the downlink path loss, and the number of resources occupied by the first sidelink positioning reference signal. Thus, the target transmission power may be determined with reference to the number of resources occupied by the first sidelink positioning reference signal, so that a more appropriate result can be achieved.

[0174] The second transmission power is determined based on the second parameter and the sidelink path loss. Thus, in the process of determining the target transmission power, the first terminal device may take into account the influence caused by the sidelink path, so that a more appropriate target transmission power can be determined, thereby avoiding interference between terminal devices. In another example, the second transmission power is determined based on the second parameter, the sidelink path loss, and the number of resources occupied by the first sidelink positioning reference signal. Thus, the target transmission power may be determined with reference to the number of resources occupied by the first sidelink positioning reference signal, so that a more appropriate result can be achieved.

[0175] The fourth transmission power includes the transmission power of the first terminal device, and may be, for example, the maximum transmission power of the first terminal device. In this way, the target transmission power can be determined based on the transmission power of the terminal device, so that the determined target transmission power is more closely matched to the transmission power of the terminal device.

[0176] In a possible implementation manner, the first terminal device determines the target transmission power based on a smaller value of one or more of the first value, the third transmission power, and the fourth transmission power. For example, the first terminal device determines the target transmission power based on a smaller value of the first value, the third transmission power, and the fourth transmission power. For example, the first terminal device may determine the minimum value of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power as the target transmission power, and the first value is the smaller value of the first transmission power and the second transmission power.

[0177] The target transmit power is obtained by using the following formula: P PRS (i)=min(P CMAX ,P MAX,CBR ,min(P PRS,D (i),P PRS,SL )(i)))[dBm] Equation (1)

[0178] In equation (1), P PRS (i) represents the target transmission power, and P CMAX represents the fourth transmission power, and P MAX,CBR represents the third transmission power, and P PRS,D (i) represents the first transmission power, and P PRS,SL (i) represents the second transmission power, and min(a, b) represents the minimum value of the parameters a and b. The parameters a and b are used as an example in this specification to explain the meaning of min, and dBm represents decibels relative to one milliwatt (dBm). In equation (1), P PRS (i) may also be understood as the transmit power of the SL bandwidth part (BWP) b of carrier f on transmit opportunity i.

[0179] In addition to the above example, the first terminal device may alternatively determine the target transmission power in other manners. For example, the first terminal device may determine the minimum value of one or more of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power as the target transmission power. For example, the first terminal device may determine the smaller value of the first transmission power and the second transmission power as the target transmission power. In this manner, the target transmission power can be reduced as much as possible, thereby reducing the power consumption of the terminal device. In another example, the first terminal device may determine the minimum value of the first transmission power, the second transmission power, and the first value as the target transmission power, where the first value is the minimum or maximum value of the third transmission power and the fourth transmission power. For example, the distance between the first terminal device and the network device is long, but the distance between the first terminal device and the second terminal device is short. Therefore, the sidelink path loss may be large, and the fourth transmission power may be large. When the first value is selected as the maximum value among the third transmission power and the fourth transmission power, i.e., when the first value is the fourth transmission power, the first terminal device may further determine a target transmission power based on the fourth transmission power, so that the requirements for communication between the terminal devices are as large as possible.

[0180] The first transmit power and the second transmit power are further described separately below.

[0181] (1) First transmission power The first transmit power is determined based on the first parameter, a downlink path loss, and a number of resources occupied by the first sidelink positioning reference signal.

[0182] The first transmit power is obtained by using the following formula:

number

[0183] In equation (2), P PRS,D (i) represents the first transmission power;

number

[0184] In a possible implementation, the network device does not configure the third parameter. For example, the network device does not configure the third parameter for the resource pool of the sidelink positioning reference signal. In another example, the network device does not transmit the third parameter to the first terminal device (the network device may or may not configure the third parameter for the resource pool of the sidelink positioning reference signal). In another example, the sidelink resource pool (SL-resource Pool) message transmitted by the network device to the first terminal device does not include the parameter dl-P0-SLPRS. In another example, the first terminal device cannot determine the third parameter from the parameter dl-P0-SLPRS transmitted by the network device. For example, the parameter dl-P0-SLPRS indicates a preset value.

[0185] In a possible implementation, when the network device does not configure the third parameter, in a possible implementation, the first transmission power includes the smaller value of the third transmission power and the fourth transmission power, and the formula P PRS,D (i)=min(P CMAX ,P MAX,CBR ) [dBm]. For the meaning of the parameters in this formula, please refer to the contents of the above formula (1) and formula (2). The details will not be described again. In this way, when the network device does not configure the third parameter, the first terminal device may determine the target transmission power based on the capability of the terminal device and the capability of the terminal device under the conditions of CBR and transmission priority, so that the determined target transmission power can better match the actual capability of the first terminal device. In another possible implementation manner, when determining the target transmission power, the first terminal device may not take the first transmission power into consideration.

[0186] In this embodiment of the present application, the first transmit power may alternatively be determined in other manners. For example, the first transmit power is the sum of the first parameter and the downlink path loss. In another example, the first transmit power is determined by using the first parameter and the number of resources occupied by the first sidelink positioning reference signal.

[0187] (1.1) Downlink path loss The first terminal device may estimate a downlink path loss based on the downlink signal. For example, in Equation 1, PL D =PL b,f,c (q d ), and specifically, the first terminal device uses the reference signal resource index q d The downlink path loss may be estimated by using the reference signal of q. Specifically, the downlink path loss is calculated by d The RSRP may be obtained by subtracting the measured RSRP from the transmit power of the reference signal, which may be obtained from the network device.

[0188] (2) Second transmission power The second transmit power is determined based on the second parameter, the sidelink path loss, and the number of resources occupied by the first sidelink positioning reference signal.

[0189] The second transmit power is obtained by using the following formula:

number

[0190] In equation (3), P PRS,SL (i) represents the second transmission power;

number

[0191] In a possible implementation, the network device does not configure the fourth parameter. For example, the network device does not configure the fourth parameter for the resource pool of the sidelink positioning reference signal. In another example, the network device does not transmit the fourth parameter to the first terminal device (the network device may or may not configure the fourth parameter for the resource pool of the sidelink positioning reference signal). In another example, the sidelink resource pool (SL-resource Pool) message transmitted by the network device to the first terminal device does not include the parameter sl-P0-SLPRS. In another example, the first terminal device cannot determine the fourth parameter from the parameter sl-P0-SLPRS transmitted by the network device. For example, the parameter sl-P0-SLPRS indicates a preset value.

[0192] In a possible implementation, when the network device does not configure the fourth parameter, in a possible implementation, the second transmission power includes the smaller value of the third transmission power and the fourth transmission power, and the formula P PRS,SL (i)=min(P CMAX ,P MAX,CBR) [dBm]. For the meaning of the parameters in this formula, please refer to the contents of the above formulas (1), (2), and (3). The details will not be described again. In this way, when the network device does not configure the fourth parameter, the first terminal device may determine the target transmission power based on the capability of the terminal device and the capability of the terminal device under the conditions of CBR and transmission priority, so that the determined target transmission power can better match the actual capability of the first terminal device. In another possible implementation manner, when determining the target transmission power, the first terminal device may not take the second transmission power into consideration.

[0193] In this embodiment of the present application, the second transmit power may alternatively be determined in other manners. For example, the second transmit power is the sum of the second parameter and the sidelink path loss. In another example, the second transmit power is determined by using the second parameter and the number of resources occupied by the first sidelink positioning reference signal.

[0194] (2.1) Sidelink path loss In a possible implementation, the second terminal device generates first information and transmits the first information to the first terminal device. The first information includes information on the received power of a sidelink signal from the first terminal device, information on a sidelink pathloss, or information on the transmission power of a sidelink signal transmitted by the second terminal device. The first terminal device receives the first information from the second terminal device. The first terminal device determines the sidelink pathloss based on the first information. The first terminal device determines the sidelink pathloss in multiple ways, thereby improving the flexibility of the solution. Furthermore, the sidelink pathloss is determined based on information transmitted between the first terminal device and the second terminal device via the sidelink, thereby improving the accuracy of the sidelink pathloss. The sidelink signal in this embodiment of the present application may be a sidelink PRS, an SRS, a CSI-RS, a DMRS, a PTRS, or an S-SS / PSBCH block.

[0195] There are several ways to transmit the first information between the second terminal device and the first terminal device. For example, the second terminal device may send the first information to the first terminal device through a PC5 interface, for example, the first information is carried in a PC5 RRC message. In another example, the second terminal device and the first terminal device transmit the first information through a device such as another terminal device or a network device. For example, the second terminal device may transmit the first information to the network device (for example, the first terminal device transmits the first information through a Uu interface between the first terminal device and the network device). After receiving the first information, the network device forwards the first information to the second terminal device.

[0196] In another possible implementation manner, when the first information includes information regarding the received power of a sidelink signal from the first terminal device, the second terminal device may further transmit to the first terminal device a resource identifier (ID) of the sidelink signal from the first terminal device and / or a resource set identifier (ID) corresponding to the resource of the sidelink signal from the first terminal device. Part or all of the two pieces of information may be included in the first information, or may not be included in the first information. Next, some of the contents will be described using an example in which the two pieces of information are included in the first information. In this way, the first terminal device may determine the sidelink signal corresponding to the received power included in the first information, and then determine the sidelink path loss based on the transmission power of the sidelink signal and the received power in the first information. One resource set identifier corresponds to one resource set, and one resource set includes one or more resources.

[0197] Two possible schemes are described below using Scheme 1 and Scheme 2. In Scheme 1, the first information includes information on the received power of a sidelink signal from a first terminal device or information on a sidelink path loss. In Scheme 2, the first information includes information on the transmit power of a sidelink signal transmitted by a second terminal device.

[0198] Method 1: The first information includes information on the received power of a sidelink signal from the first terminal device or information on a sidelink path loss.

[0199] For example, the first information may include one of the following: information on the received power of a first sidelink signal, the first sidelink signal being a sidelink signal received by the second terminal device from the first terminal device and the type of the first sidelink signal including a sidelink positioning reference signal; information on the received power of a second sidelink signal, the second sidelink signal being a sidelink signal received by the second terminal device from the first terminal device and the type of the second sidelink signal including a PSSCH DMRS or a PSCCH DMRS; or information on a sidelink pathloss, the information on the sidelink pathloss being determined based on the first sidelink signal or the second sidelink signal. The sidelink pathloss may be determined between the first terminal device and the second terminal device based on the sidelink positioning reference signal, the PSSCH DMRS or the PSCCH DMRS, thereby improving the flexibility of the solution.

[0200] 4 is an example of a possible schematic flowchart of a method for determining sidelink path loss according to an embodiment of the present application. As shown in FIG. 4, the method includes the following steps:

[0201] Step 400: A first terminal device sends first configuration information to a second terminal device.

[0202] In response, the second terminal device receives the first configuration information.

[0203] The first configuration information indicates information about the sidelink signals used to determine the sidelink pathloss. In this way, the second terminal device may perform measurements based on the sidelink signals configured by using the first configuration information, thereby enabling a better management and control of the process of determining the sidelink pathloss.

[0204] In step 400, the first terminal device may transmit the first configuration information to the second terminal device through the PC5 interface, or may transmit the first configuration information to the network device, so that the network device transmits the first configuration information to the second terminal device. In another possible implementation manner, the first configuration information may alternatively be configured by the network device for the second terminal device. For example, the network device may transmit the first configuration information to the second terminal device (e.g., may transmit the first configuration information by using an RRC message). In FIG. 4, an example in which the first terminal device transmits the first configuration information to the second terminal device is used for explanation.

[0205] The first configuration information may include one or more of information on a first signal type, a first resource identifier, or a first resource set identifier. It can be seen that using the first configuration information allows for multiple ways of configuring sidelink signals, making the ways flexible and thus improving the flexibility of the solution. The first signal type is the type of sidelink signal used to determine the sidelink pathloss. The first signal type may include one or more of a sidelink positioning reference signal, a PSSCH DMRS, or a PSCCH DMRS. If the first signal type includes a sidelink positioning reference signal, the determined target transmit power is the transmit power of the first sidelink positioning reference signal. Therefore, the sidelink pathloss determined based on the sidelink positioning reference signal can more accurately reflect the environment experienced by the first sidelink positioning reference signal, thereby improving the accuracy of the target transmit power. If the first signal type includes a PSSCH DMRS and / or a PSCCH DMRS, the second terminal device may further measure the PSSCH DMRS and / or the PSCCH DMRS and feed back the first information based on the measurement result, thereby improving the flexibility of the solution.If the first signal type does not include a sidelink positioning reference signal, the first terminal device may not need to transmit a sidelink positioning reference signal to determine the sidelink path loss, thereby reducing the number of signals transmitted by the first terminal device and reducing the power consumption of the first terminal device.

[0206] The first resource identifier may include an identifier of one or more resources. The first resource set identifier may also include an identifier of one or more resource sets.

[0207] After receiving the first configuration information, the second terminal device may determine, based on the first configuration information, sidelink signals whose received powers need to be measured. For example, the first signal type may include a sidelink positioning reference signal, and the second terminal device may measure the received sidelink positioning reference signal. In another example, the first configuration information may include a first resource identifier. The second terminal device may measure sidelink signals received on resources within the one or more resources indicated by the first resource identifier and feed back first information based on one or more received powers obtained through the measurement. For example, the first information may include a maximum, average, or larger value of one or more received powers obtained through the measurement by the second terminal device. In another example, the first configuration information may include a first resource set identifier. The second terminal device may measure sidelink signals received on resources within the one or more resources indicated by the first resource set identifier and feed back first information based on one or more received powers obtained through the measurement. For example, the first information may include a maximum, average, or larger value of one or more received powers.

[0208] Step 400 may be an optional step, and the second terminal device may not receive the first configuration information. In this case, in a possible implementation, the second terminal device may measure the received SLRS resource on the SLRS resource and feed back the first information based on one or more received power values ​​obtained through the measurement. For example, the first information may include a maximum value, an average value, a larger value, etc., of the one or more received power values.

[0209] Step 401: A first terminal device transmits a first sidelink signal.

[0210] The second terminal device may receive a first sidelink signal, the type of which includes a sidelink positioning reference signal.

[0211] Step 402: The first terminal device transmits a second sidelink signal.

[0212] The second terminal device may receive a second sidelink signal, the type of which includes a PSSCH DMRS or a PSCCH DMRS.

[0213] There is no order between step 401 and step 402, and step 402 may be performed before step 401.

[0214] Step 403: The second terminal device determines whether to acquire the received power of the first sidelink signal.

[0215] Step 404 is executed when the second terminal device acquires the received power of the first sidelink signal.

[0216] When the second terminal device does not acquire the received power of the first sidelink signal, step 406 is executed.

[0217] In this embodiment of the present application, an example in which the first sidelink signal is a sidelink positioning reference signal and the second sidelink signal is not a sidelink positioning reference signal (e.g., a PSSCH DMRS or a PSCCH DMRS) is used for explanation. In this embodiment of the present application, the received power of the first sidelink signal fed back by the second terminal device may be understood as the transmit power of the sidelink positioning reference signal.

[0218] In a possible implementation, prior to step 403, the second terminal device may receive first configuration information. For example, the first signal type may include a type of the first sidelink signal. After receiving the first configuration information, the second terminal device may measure the received sidelink positioning reference signals and feed back the received power of the first sidelink signal based on the obtained received power of one or more sidelink signals. For example, the maximum, largest, or average of the received powers of the one or more sidelink signals may be used as the received power of the first sidelink signal. In another example, the first resource identifier may include a resource identifier of the first sidelink signal. In another example, the first resource set identifier may include a resource set identifier of the resources of the first sidelink signal. Similarly, the second terminal device may perform measurements based on the first resource identifier and / or the first resource set identifier included in the first configuration information and feed back the received power of the first sidelink signal based on the obtained received power of one or more sidelink signals. For example, the maximum, largest or average of the received powers of one or more sidelink signals may be used as the received power of the first sidelink signal. For related content, please refer to the relevant description of step 400. Details will not be described again.

[0219] In step 403, the second terminal device may not acquire the received power of the first sidelink signal. For example, the second terminal device may not receive the first sidelink signal successfully. Alternatively, the second terminal device may receive the first sidelink signal successfully but not be able to measure the received power of the first sidelink signal, or may fail to measure the first sidelink signal or experience a measurement error. When the second terminal device does not acquire the received power of the first sidelink signal, there may be several implementations for the second terminal device. For example, as shown in FIG. 4, when the second terminal device does not acquire the received power of the first sidelink signal (e.g., a sidelink positioning reference signal), the second terminal device may measure the second sidelink signal (e.g., a PSSCH DMRS or a PSCCH DMRS) and feed back the acquired received power of the second sidelink signal to the first terminal device. This example is used for the description of FIG. 4.

[0220] In the implementation illustrated in FIG. 4, the first signal type in the first configuration information may include the type of the second sidelink signal. For example, the first signal type may include a PSSCH DMRS and / or a PSCCH DMRS. In this manner, when the second terminal device does not acquire the received power of the first sidelink signal, the second terminal device may measure the PSSCH DMRS and / or the PSCCH DMRS (e.g., the second sidelink signal) and include the acquired measurement result (e.g., received power) in the first information.

[0221] In another possible implementation manner, the first signal type in the first configuration information may not include the type of the second sidelink signal. Thus, when the second terminal device does not acquire the received power of the first sidelink signal, the second terminal device may measure the PSSCH DMRS and / or PSCCH DMRS (e.g., the second sidelink signal) according to a preset rule or a default rule, and include the acquired measurement result (e.g., received power) in the first information.

[0222] In another possible implementation manner, the first configuration information may include information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. The first configuration information may also include information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. In this way, when the second terminal device does not acquire the received power of the first sidelink signal, the second terminal device may measure the PSSCH DMRS and / or the PSCCH DMRS (e.g., the second sidelink signal) according to a preset rule or a default rule and include the acquired measurement result (e.g., received power) in the first information.

[0223] For example, a special bit may be set in a field of the first configuration information. If the bit value of the bit is 1, this may indicate that the PSSCH DMRS belongs to the sidelink signals used to determine the sidelink pathloss. If the bit is 0, this may indicate that the PSSCH DMRS does not belong to the sidelink signals used to determine the sidelink pathloss. In another example, a special bit may be set in a field of the first configuration information. If the bit value of the bit is 1, this may indicate that the PSSCH DMRS and the PSCCH DMRS belong to the sidelink signals used to determine the sidelink pathloss. If the bit is 0, this may indicate that the PSSCH DMRS and the PSCCH DMRS do not belong to the sidelink signals used to determine the sidelink pathloss.

[0224] In this embodiment of the present application, step 406 performed by the second terminal device shown in Figure 4 is a possible example. When the second terminal device does not acquire the received power of the first sidelink signal, other implementation manners may also be performed.

[0225] For example, when the second terminal device does not acquire the received power of the first sidelink signal, the second terminal device may report information indicating a measurement error to the network device. Based on the information indicating the measurement error, the network device may instruct the first terminal device to continue transmitting the sidelink positioning reference signal, or may instruct the second terminal device to measure the PSSCH DMRS or PSCCH DMRS from the first terminal device and feed back the acquired received power of the PSSCH DMRS or PSCCH DMRS included in the first information to the first terminal device.

[0226] In another example, when the second terminal device does not acquire the received power of the first sidelink signal, the second terminal device may continue to wait for the next sidelink positioning reference signal from the first terminal device until the second terminal device successfully acquires the received power of one sidelink positioning reference signal, and then feeds back information about the received power of the sidelink positioning reference signal to the first terminal device.

[0227] In another example, when the second terminal device does not obtain the received power of the first sidelink signal, the second terminal device may feed back to the first terminal device information included in the first information, which information is about the received power of the previous sidelink positioning reference signal, PSSCH DMRS or PSCCH DMRS from the first terminal device, so that the first terminal device estimates the sidelink pathloss based on the received power and transmit power of the previous sidelink positioning reference signal, PSSCH DMRS or PSCCH DMRS.

[0228] Step 404: The second terminal device transmits information regarding the received power of the first sidelink signal to the first terminal device.

[0229] Correspondingly, the first terminal device receives information regarding the received power of the first sidelink signal.

[0230] In step 404, the second terminal device may transmit information regarding the received power of the first sidelink signal to the network device, and the network device then transmits the information regarding the received power of the first sidelink signal to the first terminal device. In another possible implementation manner, the second terminal device may directly transmit the information regarding the received power of the first sidelink signal to the first terminal device over the PC5 interface.

[0231] In this embodiment of the application, the information on the received power of the first sidelink signal may be, for example, reference signal received power (RSRP) of the first sidelink signal, in which case the first information includes information on the received power of the first sidelink signal.

[0232] Step 405: Upon receiving the received power of the first sidelink signal, the first terminal device determines a sidelink path loss based on the received power of the first sidelink signal and the transmit power of the first sidelink signal.

[0233] In another possible implementation manner, when the first information includes information regarding the received power of the first sidelink signal, the first information may further include a resource identifier of the first sidelink signal and / or a resource set identifier corresponding to the resources of the first sidelink signal. In this way, the first terminal device may determine the sidelink signal corresponding to the received power included in the first information based on the resource identifier and / or resource set identifier included in the first information, and then determine the sidelink pathloss based on the transmission power of the sidelink signal and the received power in the first information.

[0234] In another possible implementation manner, in step 404, the second terminal device may transmit information regarding the sidelink pathloss to the first terminal device. The first information includes information regarding the sidelink pathloss. The information regarding the sidelink pathloss may be determined based on the first sidelink signal. For example, the first terminal device may further transmit information regarding the transmit power of the first sidelink signal to the second terminal device, and the second terminal device may determine the sidelink pathloss based on the receive power and transmit power of the first sidelink signal.

[0235] Step 406: The second terminal device acquires the received power of the second sidelink signal.

[0236] Step 407: The second terminal device transmits information regarding the received power of the second sidelink signal to the first terminal device.

[0237] Correspondingly, the first terminal device receives information regarding the received power of the second sidelink signal from the second terminal device.

[0238] In step 407, the second terminal device may transmit information regarding the received power of the second sidelink signal to the network device, which then transmits the information regarding the received power of the second sidelink signal to the first terminal device. In another possible implementation manner, the second terminal device may directly transmit the information regarding the received power of the second sidelink signal to the first terminal device over the PC5 interface.

[0239] In this embodiment of the present application, the information on the received power of the second sidelink signal may be, for example, the RSRP of the second sidelink signal, in which case the first information includes information on the received power of the second sidelink signal.

[0240] Step 408: Upon receiving the received power of the second sidelink signal, the first terminal device determines a sidelink pathloss based on the received power of the second sidelink signal and the transmit power of the second sidelink signal.

[0241] In another possible implementation manner, if the first terminal device receives the received power of multiple sidelink signals, the first terminal device may determine the sidelink pathloss based on the received power of one or more sidelink signals.

[0242] In another possible implementation manner, when the first information includes information regarding the received power of the second sidelink signal, the first information may further include a resource identifier of the second sidelink signal and / or a resource set identifier corresponding to the resources of the second sidelink signal. In this manner, the first terminal device may determine a sidelink signal (e.g., the second sidelink signal) corresponding to the received power included in the first information based on the resource identifier and / or resource set identifier included in the first information, and then determine a sidelink pathloss based on the transmission power of the sidelink signal and the received power in the first information.

[0243] In another possible implementation manner, in step 407, the second terminal device may transmit information about the sidelink pathloss to the first terminal device. The first information includes information about the sidelink pathloss. The information about the sidelink pathloss may be determined based on the second sidelink signal. For example, the first terminal device may further transmit information about the transmission power of the second sidelink signal to the second terminal device, and the second terminal device may determine the sidelink pathloss based on the reception power and transmission power of the second sidelink signal.

[0244] In this embodiment of the present application, the first terminal device may not successfully receive information about the received power of the first sidelink signal. For example, the second terminal device does not feed back information about the received power of the first sidelink signal, or the first terminal device fails to receive the received power of the first sidelink signal. In this case, there may be several possible implementation ways for the first terminal device.

[0245] For example, in the embodiment shown in FIG. 4, the first terminal device may determine whether information regarding the received power of the second sidelink signal has been received, and, if the received power of the second sidelink signal is successfully received, determine the sidelink pathloss based on the received power of the second sidelink signal and the transmit power of the second sidelink signal.

[0246] In another example, the first terminal device may determine the sidelink pathloss based on the received power of one or more of the past positioning sidelink signals, the PSSCH DMRS, or the PSCCH DMRS previously fed back by the second terminal device and the transmit power of these signals.

[0247] Scheme 2: The first information includes information regarding the transmission power of the sidelink signal transmitted by the second terminal device.

[0248] In this implementation, the second terminal device may transmit a sidelink signal used to determine the sidelink pathloss, thereby causing the first terminal device to measure the sidelink signal. For example, the first information may include information on the transmission power of a third sidelink signal, the third sidelink signal being from the second terminal device, and a type of the third sidelink signal including a sidelink positioning reference signal, and / or information on the transmission power of a fourth sidelink signal, the fourth sidelink signal being from the second terminal device, and a type of the third sidelink signal including a PSSCH DMRS or a PSCCH DMRS. In this solution, the sidelink pathloss is determined based on information transmitted between the first and second terminal devices via the sidelink, thereby improving the accuracy of the sidelink pathloss determination.

[0249] 5 is an example of a possible schematic flowchart of a method for determining sidelink path loss according to an embodiment of the present application. As shown in FIG. 5, the method includes the following steps:

[0250] Step 500: The second terminal device sends second configuration information to the first terminal device.

[0251] In response, the first terminal device receives second configuration information.

[0252] The second configuration information indicates information about the sidelink signals used to determine the sidelink pathloss. In this way, the second terminal device may perform measurements based on the sidelink signals configured by using the first configuration information, thereby enabling a better management and control of the process of determining the sidelink pathloss.

[0253] In step 500, the second terminal device may transmit the second configuration information to the first terminal device through the PC5 interface, or may transmit the second configuration information to the network device, so that the network device transmits the second configuration information to the first terminal device. In another possible implementation manner, the second configuration information may alternatively be configured by the network device for the first terminal device. For example, the network device may transmit the second configuration information to the first terminal device (e.g., may transmit the second configuration information by using an RRC message). In FIG. 5, an example in which the second terminal device transmits the second configuration information to the first terminal device is used for explanation.

[0254] The second configuration information may include one or more of information on a second signal type, a second resource identifier, or a second resource set identifier. It can be seen that using the second configuration information allows multiple ways of configuring sidelink signals, and the ways are flexible, thereby improving the flexibility of the solution. The second signal type is a type of sidelink signal used to determine sidelink pathloss. The second signal type may include one or more of a sidelink positioning reference signal, a PSSCH DMRS, or a PSCCH DMRS. The second resource identifier may include identifiers of one or more resources. The second resource set identifier may also include identifiers of one or more resource sets.

[0255] If the second signal type includes a sidelink positioning reference signal, the determined target transmission power is the transmission power of the first sidelink positioning reference signal. Therefore, the sidelink path loss determined based on the sidelink positioning reference signal can more accurately reflect the environment experienced by the first sidelink positioning reference signal, thereby improving the accuracy of the target transmission power. In another possible implementation, the second signal type further includes a PSSCH DMRS type and / or a PSCCH DMRS type. Furthermore, the first terminal device may further measure the PSSCH DMRS and / or the PSCCH DMRS and determine the sidelink path loss based on the measurement results, thereby improving the flexibility of the solution. Furthermore, if the second signal type does not include a sidelink positioning reference signal, the second terminal device may not need to transmit a sidelink positioning reference signal to determine the sidelink path loss. Consequently, the number of signals transmitted by the second terminal device may be reduced, thereby reducing the power consumption of the first terminal device.

[0256] After receiving the second configuration information, the first terminal device may determine, based on the second configuration information, sidelink signals whose received powers need to be measured. For example, the second signal type may include a sidelink positioning reference signal, and the first terminal device may measure the received sidelink positioning reference signal. In another example, the second configuration information may include a second resource identifier. The first terminal device may measure the received sidelink signals on resources within the one or more resources indicated by the second resource identifier to obtain the received powers of the one or more sidelink signals, and then determine the sidelink pathloss based on the maximum, largest, average, etc., of the received powers of the one or more sidelink signals. In another example, the second configuration information may include a second resource set identifier. The first terminal device may measure the received sidelink signals on resources within the one or more resources indicated by the second resource set identifier to obtain the received powers of the one or more sidelink signals, and then determine the sidelink pathloss based on the maximum, largest, average, etc., of the received powers of the one or more sidelink signals. For example, the first terminal device determines the sidelink pathloss based on the maximum value among the obtained received powers of one or more sidelink signals and the transmit power of the sidelink signal corresponding to the maximum value.

[0257] Step 500 may be an optional step, and the first terminal device may not receive the second configuration information. In this case, in a possible implementation, the first terminal device may measure the received sidelink positioning reference signals on the sidelink positioning reference signal resources and determine the sidelink path loss based on one or more received powers obtained through the measurement.

[0258] Step 501: A second terminal device transmits a third sidelink signal.

[0259] The first terminal device may receive a third sidelink signal, the type of which includes a sidelink positioning reference signal.

[0260] Step 502: The second terminal device transmits information regarding the transmission power of the third sidelink signal to the first terminal device.

[0261] Correspondingly, the first terminal device receives information regarding the transmission power of the third sidelink signal.

[0262] In step 502, the second terminal device may transmit information regarding the transmission power of the third sidelink signal to the network device, which then transmits the information regarding the transmission power of the third sidelink signal to the first terminal device. In another possible implementation manner, the second terminal device may transmit the information regarding the transmission power of the third sidelink signal directly to the first terminal device over the PC5 interface. In another possible implementation manner, the second terminal device may further transmit a resource identifier and / or a resource set identifier of the third sidelink signal to the first terminal device, so that the first terminal device knows the resource and / or resource set of the sidelink signal corresponding to the information regarding the transmission power transmitted by the second terminal device in step 502. The resource identifier and / or resource set identifier of the third sidelink signal and the information regarding the transmission power of the third sidelink signal may be carried in the same message.

[0263] Step 502 may be performed before step 506, and there is no absolute order between step 502 and any one of steps 500 to 505. For example, step 502 may be performed first, and then one or more of steps 500 to 505 are performed.

[0264] Step 503: The second terminal device transmits a fourth sidelink signal.

[0265] The first terminal device may receive a fourth sidelink signal, the type of which includes a PSSCH DMRS or a PSCCH DMRS.

[0266] There is no order between step 501 and step 503, and step 503 may be performed before step 501.

[0267] Step 504: The second terminal device transmits information regarding the transmission power of the fourth sidelink signal to the first terminal device.

[0268] Correspondingly, the first terminal device receives information regarding the transmission power of the fourth sidelink signal from the second terminal device.

[0269] In step 504, the second terminal device may transmit information regarding the transmission power of the fourth sidelink signal to the network device, which then transmits the information regarding the transmission power of the fourth sidelink signal to the first terminal device. In another possible implementation manner, the second terminal device may transmit the information regarding the transmission power of the fourth sidelink signal directly to the first terminal device over the PC5 interface. In another possible implementation manner, the second terminal device may further transmit a resource identifier and / or a resource set identifier of the fourth sidelink signal to the first terminal device, so that the first terminal device knows the resource and / or resource set of the sidelink signal corresponding to the received information regarding the transmission power transmitted by the second terminal device in step 504. The resource identifier and / or resource set identifier of the fourth sidelink signal and the information regarding the transmission power of the fourth sidelink signal may be carried in the same message.

[0270] Step 504 may be performed before step 508, and there is no absolute order between step 504 and any one of steps 500 to 507. For example, step 504 may be performed first, and then one or more of steps 500 to 507 are performed.

[0271] Step 505: The first terminal device determines whether to acquire the received power of the third sidelink signal.

[0272] Step 506 is executed when the first terminal device acquires the received power of the third sidelink signal.

[0273] When the first terminal device does not acquire the received power of the third sidelink signal, step 507 is executed.

[0274] In this embodiment of the present application, an example in which the third sidelink signal is a sidelink positioning reference signal and the fourth sidelink signal is not a sidelink positioning reference signal (e.g., the fourth sidelink signal is a PSSCH DMRS or a PSCCH DMRS) is used for illustration purposes. In this embodiment of the present application, the received power of the third sidelink signal obtained by the first terminal device may be understood as the received power of the sidelink positioning reference signal.

[0275] In a possible implementation, prior to step 505, the first terminal device may receive second configuration information. For example, the second signal type may include a type of a third sidelink signal. After receiving the second configuration information, the first terminal device may measure the received sidelink positioning reference signals and determine the received power of the third sidelink signal based on the obtained received powers of one or more sidelink signals. For example, the maximum, largest, or average of the received powers of the one or more sidelink signals may be used as the received power of the third sidelink signal. In another example, the second resource identifier may include a resource identifier of the third sidelink signal. In another example, the second resource set identifier may include a resource set identifier of the resources of the third sidelink signal. Similarly, the first terminal device may perform measurements based on the second resource identifier and / or the second resource set identifier included in the second configuration information and determine the received power of the third sidelink signal based on the obtained received powers of one or more sidelink signals. For example, the maximum, largest or average of the received powers of one or more sidelink signals may be used as the received power of the third sidelink signal. For related content, please refer to the relevant description of step 500. Details will not be described again.

[0276] In step 505, the first terminal device may not acquire the received power of the third sidelink signal. For example, the first terminal device may not receive the third sidelink signal successfully. Alternatively, the second terminal device may receive the third sidelink signal successfully but not measure the received power of the third sidelink signal, or may fail to measure the third sidelink signal or experience a measurement error. When the first terminal device does not acquire the received power of the third sidelink signal, there may be several implementations for the first terminal device. For example, as shown in FIG. 5, when the first terminal device does not acquire the received power of the third sidelink signal (e.g., a sidelink positioning reference signal), the first terminal device may measure the fourth sidelink signal (e.g., a PSSCH DMRS or a PSCCH DMRS) and determine the sidelink path loss based on the acquired received power of the fourth sidelink signal. This example is used for the explanation of FIG. 5.

[0277] In the implementation illustrated in FIG. 5, the second signal type in the second configuration information may include a fourth sidelink signal type. For example, the second signal type may include a PSSCH DMRS and / or a PSCCH DMRS. In this manner, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may measure the PSSCH DMRS and / or the PSCCH DMRS (e.g., the fourth sidelink signal) and determine the sidelink pathloss based on the acquired measurement results.

[0278] In another possible implementation manner, the first signal type in the second configuration information may not include the type of the fourth sidelink signal. Thus, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may measure the PSSCH DMRS and / or PSCCH DMRS (e.g., the fourth sidelink signal) according to a preset rule or a default rule and determine the sidelink path loss based on the acquired measurement result.

[0279] In another possible implementation manner, the second configuration information may include information indicating that the PSSCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSSCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. The second configuration information may also include information indicating that the PSCCH DMRS belongs to the sidelink signals used for determining the sidelink pathloss, or information indicating that the PSCCH DMRS does not belong to the sidelink signals used for determining the sidelink pathloss. In this way, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may measure the PSSCH DMRS and / or the PSCCH DMRS (e.g., the fourth sidelink signal) according to a preset rule or a default rule and determine the sidelink pathloss based on the acquired measurement result.

[0280] For example, a special bit may be set in the field of the second configuration information. If the bit value of the bit is 1, this may indicate that the PSSCH DMRS belongs to the sidelink signals used to determine the sidelink pathloss. If the bit is 0, this may indicate that the PSSCH DMRS does not belong to the sidelink signals used to determine the sidelink pathloss. In another example, a special bit may be set in the field of the second configuration information. If the bit value of the bit is 1, this may indicate that the PSSCH DMRS and the PSCCH DMRS belong to the sidelink signals used to determine the sidelink pathloss. If the bit is 0, this may indicate that the PSSCH DMRS and the PSCCH DMRS do not belong to the sidelink signals used to determine the sidelink pathloss.

[0281] In this embodiment of the present application, step 507 performed by the first terminal device shown in Figure 5 is a possible example. When the first terminal device does not acquire the received power of the third sidelink signal, other implementation manners may also be performed.

[0282] For example, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may report information indicating a measurement error to the network device, and the network device may instruct the second terminal device to continue transmitting a sidelink positioning reference signal based on the information indicating the measurement error, or may instruct the first terminal device to measure the PSSCH DMRS or PSCCH DMRS from the second terminal device and determine a sidelink pathloss based on the acquired received power of the PSSCH DMRS or PSCCH DMRS.

[0283] In another example, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may continue to wait for the next sidelink positioning reference signal from the second terminal device until the first terminal device successfully acquires the received power of one sidelink positioning reference signal, and then determine the sidelink pathloss based on the acquired received power of the sidelink positioning reference signal.

[0284] In another example, when the first terminal device does not acquire the received power of the third sidelink signal, the first terminal device may estimate the sidelink pathloss based on the received power and transmit power of the previous sidelink positioning reference signal, PSSCH DMRS, or PSCCH DMRS from the second terminal device.

[0285] Step 506: The first terminal device determines a sidelink path loss based on the transmit power of the third sidelink signal and the received power of the third sidelink signal.

[0286] In this implementation, when the first terminal device obtains the received power of the third sidelink signal, the first terminal device determines the sidelink pathloss based on the received power of the third sidelink signal and the transmit power of the third sidelink signal. Since the determined target transmit power is the transmit power of the first sidelink positioning reference signal, the sidelink pathloss determined based on the sidelink positioning reference signal can more accurately reflect the environment faced by the first sidelink positioning reference signal, and therefore the accuracy of the target transmit power can be improved.

[0287] Step 507: The first terminal device acquires the received power of the fourth sidelink signal.

[0288] Step 508: The first terminal device determines a sidelink path loss based on the transmit power of the fourth sidelink signal and the received power of the fourth sidelink signal.

[0289] In this embodiment of the present application, the first terminal device may not successfully receive the information regarding the transmission power of the third sidelink signal. For example, the second terminal device does not feed back the information regarding the transmission power of the third sidelink signal, or the first terminal device fails to receive the information regarding the transmission power of the third sidelink signal. In this case, there may be several possible implementation ways for the first terminal device.

[0290] For example, in the embodiment shown in Fig. 5, the first terminal device may determine whether information regarding the transmission power of the fourth sidelink signal has been received, and, if the transmission power of the fourth sidelink signal is successfully received, determine the sidelink pathloss based on the transmission power of the fourth sidelink signal and the received power of the fourth sidelink signal. In this way, the flexibility of the solution can be improved. Furthermore, since the fourth sidelink signal is a signal transmitted between the second terminal device and the first terminal device via the sidelink, the fourth sidelink signal can also accurately reflect the sidelink pathloss, thereby improving the accuracy of the target transmission power.

[0291] In another example, the first terminal device may determine the sidelink pathloss based on the transmit power of one or more of the past positioning sidelink signals, the PSSCH DMRS, or the PSCCH DMRS previously fed back by the second terminal device and the received power of these signals.

[0292] In this embodiment of the present application, since the first sidelink positioning reference signal and the sidelink signal used to determine the sidelink pathloss may have different frequencies, in a possible implementation, the sidelink pathloss may be determined based on the difference between the frequencies of the first sidelink positioning reference signal and the sidelink signal. In this way, a more accurate sidelink pathloss can be obtained. Two possible implementations are described below.

[0293] Implementation method 1 In the first implementation, the first terminal device determines a quasi-sidelink pathloss based on the first information, and the first terminal device determines a sidelink pathloss based on the quasi-sidelink pathloss and a first offset, where the first offset is determined based on the difference between the frequency of a sidelink signal associated with the quasi-sidelink pathloss and the frequency of a first sidelink positioning reference signal. For example, the sidelink pathloss is the sum of the sidelink pathloss and the first offset. In this way, the complexity of the solution can be reduced.

[0294] In this embodiment of the present application, the sidelink signal associated with the quasi-sidelink pathloss may be the sidelink signal used to determine the sidelink pathloss. For example, if the first terminal device determines the sidelink pathloss based on the first sidelink signal in FIG. 4, the sidelink signal associated with the quasi-sidelink pathloss may be the first sidelink signal, and the first terminal device may use the difference between the transmit power and the received power of the first sidelink signal as the quasi-sidelink pathloss. Similarly, the sidelink signal associated with the quasi-sidelink pathloss may alternatively be the second sidelink signal in FIG. 4 or the third or fourth sidelink signal in FIG. 5. Related solutions are similar to those for the first sidelink signal. Details will not be described again.

[0295] For example, the first terminal device determines the sidelink path loss according to the following formula: PL PRS,SL (i)=PL PRS,SL_n (i)+ΔP1 formula (4)

[0296] In equation (4), PL PRS,SL (i) represents the sidelink path loss, and PL PRS,SL_n (i) represents the quasi-path loss, and ΔP1 represents the first offset.

[0297] For example, the first offset ΔP1 in equation (4) is calculated by the equation ΔP1=20lg(f n / f), where f n where is the frequency of the sidelink signal associated with the quasi-sidelink pathloss and f is the frequency of the first sidelink positioning reference signal. It can be seen that this formula can accurately reflect the difference between the frequency of the sidelink signal associated based on the quasi-sidelink pathloss and the frequency of the first sidelink positioning reference signal.

[0298] Implementation method 2 In the second implementation, the first terminal device determines the fifth transmit power based on the second parameter and the sidelink path loss. The sidelink path loss may be determined using the above-described content, for example, the related content in FIG. 4 or FIG. 5. The first terminal device determines the second transmit power based on the fifth transmit power and a second offset, where the second offset is determined based on the difference between the frequency of the sidelink signal associated with the sidelink path loss and the frequency of the first sidelink positioning reference signal. In this solution, the process of determining the second transmit power may be adjusted by using the second offset, resulting in a more accurate second transmit power, which in turn improves the accuracy of the target transmit power. For example, the second transmit power is equal to the sum of the fifth transmit power and the second offset. In this way, the complexity of the solution can be reduced.

[0299] In this embodiment of the present application, the sidelink signal associated with the quasi-sidelink pathloss may be the sidelink signal used to determine the sidelink pathloss. For example, if the first terminal device determines the sidelink pathloss based on the first sidelink signal in FIG. 4, the sidelink signal associated with the quasi-sidelink pathloss may be the first sidelink signal, and the first terminal device may use the difference between the transmit power and the received power of the first sidelink signal as the sidelink pathloss. Similarly, the sidelink signal associated with the quasi-sidelink pathloss may alternatively be the second sidelink signal in FIG. 4 or the third or fourth sidelink signal in FIG. 5. Related solutions are similar to those for the first sidelink signal. Details will not be described again.

[0300] For example, the first terminal device determines the second transmission power according to the following formula: P PRS,SL (i)=P PRS,SL_n (i)+ΔP2 formula (5)

[0301] In equation (5), P PRS,SL (i) represents the second transmission power, and P PRS,SL_n (i) represents the fifth transmission power, and ΔP2 represents the second offset.

[0302] For example, the second offset ΔP2 in equation (5) is ΔP2=α SL 20lg(f n / f), where α SL represents the sidelink path loss adjustment value, and f n is the frequency of the sidelink signal associated with the quasi-sidelink pathloss, and f is the frequency of the first sidelink positioning reference signal. It can be seen that this formula can accurately reflect the difference between the frequency of the sidelink signal associated based on the quasi-sidelink pathloss and the frequency of the first sidelink positioning reference signal. The sidelink pathloss adjustment value α in this formula SL may also be changed to other coefficients, which is not limited in this embodiment of this application.

[0303] Based on the embodiments shown in Figures 1, 2, 3, 4 and 5 and other contents, Figure 6 is an example of a possible schematic flowchart of another communication method according to an embodiment of the present application. For the relevant contents of the performers of Figure 6, please refer to the relevant description in Figure 3. The details will not be described again.

[0304] As shown in FIG. 6, the method includes the following steps:

[0305] Step 601: A first terminal device transmits a second sidelink positioning reference signal.

[0306] Correspondingly, the second terminal device may receive a second sidelink positioning reference signal.

[0307] Step 602: The second terminal device determines a power feedback parameter based on the second sidelink positioning reference signal.

[0308] The power feedback parameter is determined based on the received power of the second sidelink positioning reference signal and the received power of the sidelink positioning reference signal that the second terminal device expects to receive.

[0309] Step 603: The second terminal device sends a power feedback parameter to the first terminal device.

[0310] Correspondingly, the first terminal device receives a power feedback parameter from the second terminal device.

[0311] In step 603, the power feedback parameters may be carried in a request message, a measurement feedback message, a PC5 RRC message, a media access control control element (MAC CE), an SCI, or the like.

[0312] Step 604: The first terminal device determines a target transmission power based on the power control parameter, and the first terminal device determines the target transmission power based on the power control parameter and the power feedback parameter.

[0313] For example, the distance between the first terminal device and the second terminal device is greater than the distance between the first terminal device and the network device. Specifically, the distance between the first terminal device and the second terminal device is long, while the distance between the first terminal device and the network device is short. The longer distance may cause a larger path loss, and the sidelink path loss may be greater than the downlink path loss. Then, the second transmit power obtained based on the sidelink path loss may be greater than the first transmit power calculated based on the downlink path loss. If the first terminal device selects a smaller value of the first transmit power and the second transmit power (i.e., the first transmit power) or selects a value smaller than the smaller value as the target transmit power, the sidelink path loss may be large, so the target transmit power selected by the first terminal device may be small. As a result, the transmit power of the first sidelink positioning reference signal transmitted by the first terminal device may be insufficient.

[0314] However, in the solution provided in this embodiment of the present application, the first terminal device may determine the target transmission power based on the power feedback parameter, so that the shortcomings of the open-loop power control mechanism can be compensated for and the target transmission power can be better adjusted through feedback and adjustment. For example, when the second terminal device may instruct the first terminal device to increase the transmission power of the sidelink positioning reference signal by using the power feedback parameter, the first terminal device may increase the target transmission power based on the power feedback parameter to alleviate the problem of insufficient transmission power of the first sidelink positioning reference signal. In another example, when the second terminal device may instruct the first terminal device to decrease the transmission power of the sidelink positioning reference signal by using the power feedback parameter, the first terminal device may decrease the target transmission power based on the power feedback parameter to reduce the power consumption of the first terminal device and reduce interference to other transmission signals.

[0315] A number of possible implementation methods may be included in step 604. In the following, implementation methods 1 to 5 are used as examples for explanation.

[0316] Implementation method 1 The first terminal device adjusts the first transmission power based on the power feedback parameter, and determines the target transmission power based on the adjusted first transmission power. For example, the first terminal device may multiply the power feedback parameter by a preset coefficient and then add the power feedback parameter to the first transmission power, where the obtained value is the adjusted first transmission power, and the preset coefficient may be equal to 1 or not.

[0317] There are several ways in which the first terminal device determines the target transmission power based on the adjusted first transmission power. For example, the first terminal device may determine the target transmission power based on one or more of the adjusted first transmission power, second transmission power, third transmission power, and fourth transmission power. The related solution is similar to the previous solution in which the first terminal device determines the target transmission power based on one or more of the first transmission power, second transmission power, third transmission power, and fourth transmission power. The difference is that the first transmission power is replaced with the adjusted first transmission power. For the solution for determining the first transmission power, please refer to the above content. Details will not be described again.

[0318] The first terminal device may adjust the first transmission power based on the power feedback parameter, so that the value of the adjusted first transmission power may be increased, so that the target transmission power can be improved, and then the problem of insufficient transmission power of the first sidelink positioning reference signal can be alleviated. In other cases, the value of the adjusted first transmission power may be decreased, so that the target transmission power can be reduced, so that the power consumption of the first terminal device can be reduced and interference between signals can also be reduced.

[0319] For example, the first terminal device may adjust the first transmission power according to the formula: For example, the adjusted first transmission power may be calculated by using the following formula (6): Adjusted first transmit power = P PRS,D (i)+α*ΔP Equation (6)

[0320] In equation (6), P PRS,D (i) represents the first transmission power, ΔP represents a power feedback parameter, e.g., the difference between the received power of the second sidelink positioning reference signal and the received power of the sidelink positioning reference signal that the second terminal device expects to receive, and α may be a preset value.

[0321] Based on equation (6), the above equation (1) may be replaced by the following equation (7): P PRS (i)=min(P CMAX ,P MAX,CBR ,min(P PRS,D (i)+α*ΔP,P PRS,SL (i))) Equation (7)

[0322] For the meaning of the parameters in equation (7), please refer to the relevant contents in equations (1) and (6) above, and the details will not be explained again.

[0323] In a possible implementation, α in equations (6) and (7) may be 1. In this case, equation (7) may be replaced by the following equation (8): P PRS (i)=min(P CMAX ,P MAX,CBR ,min(P PRS,D (i)+ΔP,P PRS,SL (i))) Equation (8)

[0324] For the meaning of the parameters in equation (8), please refer to the relevant contents in equations (1) and (6) above, and the details will not be explained again.

[0325] Implementation method 2 The first terminal device adjusts the second transmission power based on the power feedback parameter, and determines a target transmission power based on the adjusted second transmission power. For example, the first terminal device may multiply the power feedback parameter by a preset coefficient and then add the power feedback parameter to the second transmission power, where the obtained value is the adjusted second transmission power, and the preset coefficient may be equal to 1 or not.

[0326] There are several ways in which the first terminal device determines the target transmission power based on the adjusted second transmission power. For example, the first terminal device may determine the target transmission power based on one or more of the adjusted second transmission power, the first transmission power, the third transmission power, and the fourth transmission power. The related solution is similar to the previous solution in which the first terminal device determines the target transmission power based on one or more of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power. The difference is that the second transmission power is replaced with the adjusted second transmission power. For the solution for determining the second transmission power, please refer to the above content. Details will not be described again.

[0327] The first terminal device may adjust the second transmission power based on the power feedback parameter, so that the value of the adjusted second transmission power may be increased, thereby improving the target transmission power and alleviating the problem of insufficient transmission power of the first sidelink positioning reference signal. In other cases, the value of the adjusted second transmission power may be decreased, thereby reducing the target transmission power, thereby reducing the power consumption of the first terminal device and also reducing interference between signals.

[0328] For example, the first terminal device may adjust the second transmission power according to the formula: For example, the adjusted second transmission power may be calculated by using the following formula (9): Adjusted second transmit power = P PRS,SL (i)+α*ΔP Equation (9)

[0329] In equation (9), P PRS,SL (i) represents the second transmission power, ΔP represents a power feedback parameter, e.g., the difference between the received power of the second sidelink positioning reference signal and the received power of the sidelink positioning reference signal that the second terminal device expects to receive, and α may be a preset value.

[0330] Based on equation (9), the above equation (1) may be replaced by the following equation (10): P PRS (i)=min(P CMAX ,P MAX,CBR ),min(P PRS,D (i),P PRS,SL (i)+α*ΔP)) Equation (10)

[0331] For the meaning of the parameters in equation (10), please refer to the relevant contents in equations (1) and (9) above, and the details will not be explained again.

[0332] In a possible implementation, α in equations (10) and (9) may be 1. In this case, equation (10) may be replaced by the following equation (11). P PRS (i)=min(P CMAX ,P MAX,CBR ),min(P PRS,D (i),P PRS,SL (i)+ΔP)) Equation (11)

[0333] For the meaning of the parameters in equation (11), please refer to the relevant contents in equations (1) and (6) above, and the details will not be explained again.

[0334] Implementation method 3 The first terminal device determines a sub-target transmission power based on the first transmission power and / or the second transmission power, and determines a target transmission power based on the sub-target transmission power and the power feedback parameter. For example, the first terminal device may add the power feedback parameter to the sub-target transmission power, or may multiply the power feedback parameter by the sub-target transmission power, and other operating parameters may also be added in the operating process.

[0335] There are several ways in which the first terminal device determines the sub-target transmission power based on the first transmission power and / or the second transmission power. For example, the first terminal device may determine the sub-target transmission power based on one or more of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power. For example, the first terminal device may select the minimum value of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power as the sub-target transmission power. A related solution is similar to the previous solution in which the first terminal device determines the target transmission power based on one or more of the first transmission power, the second transmission power, the third transmission power, and the fourth transmission power.

[0336] The first terminal device may adjust the sub-target transmission power based on the power feedback parameter and then use the obtained value as the transmission power of the first sidelink positioning reference signal, which may reduce the complexity of the solution and improve the target transmission power.

[0337] In a possible implementation, equation (1) may be replaced by equation (12) below: P PRS (i)=min(P CMAX ,P MAX,CBR ,min(P PRS,D (i),P PRS,SL (i)))+ΔP Equation (12)

[0338] In equation (12), ΔP represents a power feedback parameter. For the meanings of other parameters in equation (12), please refer to the relevant content in equation (1) above. The details will not be described again.

[0339] In another possible implementation, equation (1) may be replaced by equation (13) below: P PRS (i)=min(P CMAX ,P MAX,CBR ,min(P PRS,D (i),P PRS,SL (i)))*ΔP Equation (13)

[0340] In Equation (13), ΔP represents the power feedback parameter, and * represents multiplication. For the meanings of other parameters in Equation (13), please refer to the relevant content in Equation (1) above. The details will not be described again.

[0341] Implementation method 4 The first terminal device adjusts the transmission power of the second sidelink positioning reference signal (SLRS) based on the power feedback parameter to obtain a target transmission power. For example, the first terminal device may add the power feedback parameter to the transmission power of the second SLRS, or may multiply the power feedback parameter by the transmission power of the second SLRS, and other operating parameters may also be added in the operating process. The transmission power of the second SLRS is determined based on the power control parameter. The transmission power of the second SLRS may be determined based on the method for determining the target transmission power described in any one of the above contents in Figures 3, 4, and 5. Details will not be described again.

[0342] The first terminal device may adjust the transmit power of the second sidelink positioning reference signal based on the power feedback parameter and then use the obtained value as the transmit power of the first sidelink positioning reference signal, which may reduce the complexity of the solution and improve the target transmit power.

[0343] In a possible implementation, equation (1) may be replaced by equation (14) below: P PRS (i)=P PRS (i-1)+ΔP Equation (14)

[0344] In equation (14), ΔP represents the power feedback parameter, and P PRS (i-1) represents the transmission power of the second sidelink positioning reference signal. For the meanings of the other parameters in Equation (14), please refer to the relevant content in Equation (1) above. The details will not be described again.

[0345] In another possible implementation, equation (1) may be replaced by equation (15) below: P PRS (i)=P PRS (i-1)*ΔP Equation (15)

[0346] In equation (15), ΔP represents the power feedback parameter, * represents multiplication, and P PRS (i-1) represents the transmission power of the second sidelink positioning reference signal. For the meanings of the other parameters in Equation (15), please refer to the relevant content in Equation (1) above. The details will not be described again.

[0347] It should be noted that in this embodiment of the application, a network element (e.g., network element A) receiving information from another network element (e.g., network element B) may mean that network element A receives the information directly from network element B, or that network element A receives the information from network element B through another network element (e.g., network element C). When network element A receives information from network element B through network element C, network element C may transmit the information transparently, or may process the information, for example, include the information in a different message for transmission, or may screen the information and send only the information obtained through screening to network element A. Similarly, in various embodiments of the application, a network element A sending information to network element B may mean that network element A sends the information directly to network element B, or may mean that network element A sends the information to network element B through another network element (e.g., network element C).

[0348] The terms "system" and "network" may be used interchangeably in the embodiments of this application. "At least one" means one or more, and "plurality" means two or more. The term "and / or" describes an association relationship between related objects and indicates that three relationships may exist. For example, A and / or B may mean that only A exists, that both A and B exist, and that only B exists, and A and B may be singular or plural. The character " / " typically indicates an "or" relationship between related objects. Furthermore, "at least one of the following items" or similar expressions refers to any combination of these items, including any combination of a singular item or multiple items. For example, at least one of a, b, or c may refer to a, b, c, a and b, a and c, b and c, or a, b, and c, and a, b, and c may be singular or plural.

[0349] Furthermore, unless otherwise specified, ordinal numbers such as "first" and "second" in the embodiments of this application are used to distinguish between multiple objects, and are not used to limit the order, chronological order, priority, or importance of the multiple objects.

[0350] It should be noted that the names of the above messages are merely examples. With the development of communication technology, the name of any one of the above messages may change. However, regardless of how the name of the message changes, the message will fall within the protection scope of this application, provided that the meaning of the message remains the same as the meaning of the above message in this application.

[0351] According to the above method, FIG. 7 is a diagram of the structure of a communication device according to an embodiment of this application. As shown in FIG. 7, the communication device may be a first terminal device, a network device, or a second terminal device, or may be a chip or a circuit. For example, the communication device may be a chip or a circuit that may be disposed in the first terminal device. In another example, the communication device may be a chip or a circuit that may be disposed in the network device. In another example, the communication device may be a chip or a circuit that may be disposed in the second terminal device. The communication device may be configured to perform the method performed by the first terminal device, the network device, or the second terminal device in any one of the related solutions in FIG. 3, FIG. 4, FIG. 5, or FIG. 6.

[0352] The communication device 1801 includes a processor 1802 and a transceiver 1803 .

[0353] Additionally, the communication device 1801 may include a memory 1804. In the drawing, the memory 1804 is shown with a dashed line, which further indicates that the memory is optional.

[0354] Furthermore, the communication device 1801 may further include a bus system. The processor 1802, the memory 1804, and the transceiver 1803 may be connected through the bus system.

[0355] It should be understood that the processor 1802 may be a chip. For example, the processor 1802 may be a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on a chip (SoC), a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chip.

[0356] In the implementation process, the steps in the above-mentioned methods may be completed through a hardware integrated logic circuit in the processor 1802 or by using instructions in the form of software. The steps in the methods disclosed with reference to the embodiments of this application may be directly executed and completed by a hardware processor, or may be executed and completed by using a combination of hardware and software modules in the processor 1802. The software modules may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, or a register. The storage medium is located in the memory 1804. The processor 1802 reads information in the memory 1804 and completes the steps in the above-mentioned methods in combination with the hardware in the processor 1802.

[0357] It should be noted that the processor 1802 in the embodiments of this application may be an integrated circuit chip and have signal processing capabilities. In the implementation process, the steps in the above-mentioned method embodiments may be completed through hardware integrated logic circuits in the processor or by using instructions in the form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The processor may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc. The steps in the methods disclosed with reference to the embodiments of this application may be directly executed and completed by a hardware decoding processor, or may be executed and completed by using a combination of hardware and software modules in the decoding processor. The software modules may be located in mature storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps in the above method in combination with the hardware in the processor.

[0358] It may be understood that the memory 1804 in the embodiment of this application may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory. For the relevant description of the memory in the embodiment of this application, please refer to the above content. The details will not be described again in this specification.

[0359] When the communications apparatus 1801 is a first terminal device, the processor 1802 is configured to receive, through the transceiver 1803, a power control parameter from the network device and to transmit a first sidelink positioning reference signal based on a target transmit power, the target transmit power being determined based on the power control parameter, and the power control parameter having an association relationship with a resource pool of the sidelink positioning reference signal.

[0360] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to determine a target transmission power based on the first transmission power and / or the second transmission power.

[0361] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to receive a downlink signal from a network device through the transceiver 1803. The processor 1802 is specifically configured to estimate a downlink path loss based on a measurement result obtained by measuring the downlink signal.

[0362] When the communication apparatus 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to receive first information from a second terminal device through the transceiver 1803, the first information including information on a received power of a sidelink signal from the first terminal device or information on a sidelink pathloss, or information on a transmit power of a sidelink signal transmitted by the second terminal device, and to determine a sidelink pathloss based on the first information.

[0363] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to transmit the first configuration information to a second terminal device through the transceiver 1803.

[0364] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to, when obtaining the received power of the third sidelink signal, determine a sidelink pathloss based on the received power of the third sidelink signal and the transmit power of the third sidelink signal.

[0365] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to determine the sidelink pathloss based on the received power of the fourth sidelink signal and the transmit power of the fourth sidelink signal when the received power of the third sidelink signal is not obtained.

[0366] When the communication device 1801 is a first terminal device, in a possible implementation, the processor 1802 is specifically configured to receive second configuration information through the transceiver 1803 .

[0367] When the communication apparatus 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to: determine a quasi-sidelink pathloss based on the first information; and determine the sidelink pathloss based on the quasi-sidelink pathloss and a first offset, the first offset being determined based on a difference between a frequency of a sidelink signal associated with the quasi-sidelink pathloss and a frequency of a first sidelink positioning reference signal.

[0368] When the communication apparatus 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to determine a fifth transmission power based on the second parameter and the sidelink path loss, and to determine a second transmission power based on the fifth transmission power and a second offset, where the second offset is determined based on a difference between the frequency of the sidelink signal associated with the sidelink path loss and the frequency of the first sidelink positioning reference signal.

[0369] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to determine the target transmission power based on a smaller value among the first value, the third transmission power, and the fourth transmission power, where the first value is the smaller value among the first transmission power and the second transmission power.

[0370] When the communication apparatus 1801 is a first terminal device, in a possible implementation, the processor 1802 is specifically configured to transmit a second sidelink positioning reference signal through the transceiver 1803 and receive a power feedback parameter from the second terminal device, where the power feedback parameter is determined based on a received power of the second sidelink positioning reference signal and a received power of the sidelink positioning reference signal expected to be received by the second terminal device. The processor 1802 is specifically configured to determine a target transmit power based on the power control parameter and the power feedback parameter.

[0371] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to adjust a first transmission power based on a power feedback parameter and determine a target transmission power based on the adjusted first transmission power.

[0372] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to adjust the second transmission power based on the power feedback parameter, and the first terminal device determines a target transmission power based on the adjusted second transmission power.

[0373] When the communication device 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to determine a sub-target transmission power based on the first transmission power and / or the second transmission power, and to determine a target transmission power based on the sub-target transmission power and a power feedback parameter.

[0374] When the communication apparatus 1801 is a first terminal device, in a possible implementation manner, the processor 1802 is specifically configured to adjust the transmission power of the second sidelink positioning reference signal based on the power feedback parameter to obtain a target transmission power, and the transmission power of the second sidelink positioning reference signal is determined based on the power control parameter.

[0375] When the communications apparatus 1801 is a network device, the processor 1802 is configured to transmit, through the transceiver 1803, a power control parameter to a first terminal device, the power control parameter having an association relationship with a resource pool of sidelink positioning reference signals, the power control parameter being used by the first terminal device to determine a target transmit power for transmitting the first sidelink positioning reference signal.

[0376] When the communication device 1801 is a network device, in a possible implementation, the processor 1802 is further configured to transmit the first configuration information to the second terminal device through the transceiver 1803.

[0377] When the communication apparatus 1801 is a network device, in a possible implementation, the processor 1802 is further configured to transmit the second configuration information to the first terminal device through the transceiver 1803.

[0378] When the communication apparatus 1801 is a second terminal device, the processor 1802 is configured to transmit first information through the transceiver 1803, the first information being used by the first terminal device to determine a sidelink pathloss, the first information including information on the received power of a sidelink signal from the first terminal device or information on the sidelink pathloss, or information on the transmit power of a sidelink signal transmitted by the second terminal device.

[0379] When the communication device 1801 is a second terminal device, in a possible implementation, the processor 1802 is further configured to receive first configuration information through the transceiver 1803 .

[0380] When the communication device 1801 is a second terminal device, in a possible implementation, the processor 1802 is further configured to transmit a third sidelink signal through the transceiver 1803.

[0381] When the communication device 1801 is a second terminal device, in a possible implementation, the processor 1802 is further configured to transmit a fourth sidelink signal through the transceiver 1803.

[0382] When the communication device 1801 is a second terminal device, in a possible implementation, the processor 1802 is further configured to transmit the second configuration information to the first terminal device through the transceiver 1803.

[0383] For the concepts, descriptions, detailed descriptions and other steps of the communication device related to the technical solutions provided in the embodiments of this application, please refer to the content descriptions in the above methods or other embodiments, and details will not be described in this specification.

[0384] According to the above method, FIG. 8 is a diagram of the structure of a communication device according to an embodiment of this application. As shown in FIG. 8, the communication device 1901 may include a communication interface 1903 and a processor 1902. Furthermore, the communication device 1901 may include a memory 1904. In the drawing, the memory 1904 is shown with a dashed line, which further indicates that the memory is optional. The communication interface 1903 is configured to input and / or output information. The processor 1902 is configured to execute computer programs or instructions, such that the communication device 1901 implements the first terminal device-side method in any one of the related solutions in FIG. 3, FIG. 4, FIG. 5, or FIG. 6, or the communication device 1901 implements the second terminal device-side method in any one of the related solutions in FIG. 3, FIG. 4, FIG. 5, or FIG. 6. In this embodiment of the application, the communication interface 1903 may implement the solution implemented by the transceiver 1803 in Fig. 7, the processor 1902 may implement the solution implemented by the processor 1802 in Fig. 7, and the memory 1904 may implement the solution implemented by the memory 1804 in Fig. 7. The details will not be described again in this specification.

[0385] Based on the above embodiment and the same concept, Figure 9 is a diagram of a communication device according to an embodiment of this application. As shown in Figure 9, the communication device 2001 may be a first terminal device or a second terminal device, or may be a chip or circuit, for example, a chip or circuit that can be disposed in the first terminal device or the second terminal device.

[0386] The communication device 2001 includes a processing unit 2002 and a communication unit 2003. Furthermore, the communication device 2001 may include a storage unit 2004 or may not include the storage unit 2004. In the drawing, the storage unit 2004 is shown with a dashed line, which further indicates that the memory is optional.

[0387] When the communication apparatus 2001 is a first terminal device, the processing unit 2002 is configured to receive, through the communication unit 2003, a power control parameter from the network device and transmit a first sidelink positioning reference signal based on a target transmit power, where the target transmit power is determined based on the power control parameter, and the power control parameter has an association relationship with a resource pool of the sidelink positioning reference signal.

[0388] When the communication apparatus 2001 is a network device, the processing unit 2002 is configured to send a power control parameter to the first terminal device through the communication unit 2003, the power control parameter having an association relationship with a resource pool of the sidelink positioning reference signal, and the power control parameter is used by the first terminal device to determine a target transmit power for transmitting the first sidelink positioning reference signal.

[0389] When the communication apparatus 2001 is a second terminal device, the processing unit 2002 is configured to transmit first information through the communication unit 2003, the first information being used by the first terminal device to determine a sidelink pathloss, the first information comprising information on the received power of a sidelink signal from the first terminal device or information on the sidelink pathloss, or information on the transmission power of a sidelink signal transmitted by the second terminal device.

[0390] The communication unit 2003 in this embodiment of the present application is configured to input and / or output information. The processing unit 2002 is configured to execute a computer program or instruction, so that the communication device 2001 implements the first terminal device-side method in any one of the related solutions in Figure 3, Figure 4, Figure 5, or Figure 6, or the communication device 2001 implements the second terminal device-side method in any one of the related solutions in Figure 3, Figure 4, Figure 5, or Figure 6. In this embodiment of the present application, the communication unit 2003 may implement the solution implemented by the transceiver 1803 in Figure 7, the processing unit 2002 may implement the solution implemented by the processor 1802 in Figure 7, and the storage unit 2004 may implement the solution implemented by the memory 1804 in Figure 7. Details will not be described again in this specification.

[0391] According to the method provided in the embodiments of this application, this application further provides a computer program product, which includes computer program code or instructions, which, when executed on a computer, enables the computer to perform the method in any one of the embodiments shown in Figure 3, Figure 4, Figure 5 or Figure 6.

[0392] According to the method provided in the embodiment of this application, this application further provides a computer-readable storage medium. The computer-readable storage medium stores program code. When the program code is executed on a computer, the computer can execute the method in any one of the embodiments shown in Figure 3, Figure 4, Figure 5, or Figure 6.

[0393] According to the method provided in the embodiments of this application, this application also provides a chip system. The chip system may include a processor. The processor may be coupled to a memory and configured to execute the method in any one of the embodiments shown in FIG. 3, FIG. 4, FIG. 5, or FIG. 6. Optionally, the chip system further includes a memory. The memory is configured to store a computer program (which may also be referred to as code or instructions). The processor is configured to call the computer program from the memory and execute the computer program, so that a device in which the chip system is installed executes the method in any one of the embodiments shown in FIG. 3, FIG. 4, FIG. 5, or FIG. 6.

[0394] According to the method provided in the embodiment of this application, this application further provides a system, which includes one or more first terminal devices described above, one or more second terminal devices described above, and the network device described above.

[0395] All or part of the above embodiments may be realized by software, hardware, firmware, or any combination thereof. When software is used to realize the embodiments, all or part of the embodiments may be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded into a computer and executed, the procedures or functions according to the embodiments of this application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, or digital subscriber line (DSL)) or wireless (e.g., infrared, radio, or microwave) method. The computer-readable storage medium may be any available medium accessible by a computer, or a data storage device integrating one or more available media, such as a server or data center. The media that can be used may be magnetic media (e.g., floppy disks, hard disks, or magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), semiconductor media (e.g., solid state drives (SSDs)), etc.

[0396] It should be noted that parts of this patent application document contain copyrighted material. With the exception of reproducing the patent document or the contents of the patent document recorded at the State Intellectual Property Office of China, the copyright holder reserves the copyright.

[0397] The first terminal device, the network device, and the second terminal device in the above apparatus embodiments correspond to the first terminal device, the network device, and the second terminal device in the above method embodiments. Corresponding modules or units perform corresponding steps. For example, a communication unit (transceiver) performs the receiving or transmitting step in the method embodiments, and steps other than the transmitting and receiving steps may be performed by a processing unit (processor). For the functions of specific units, please refer to the corresponding method embodiments. There may be one or more processors.

[0398] As used herein, terms such as "component," "module," and "system" refer to computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. As illustrated through the use of figures, both computing devices and applications running on computing devices may be components. One or more components may reside within a process and / or thread of execution, and a component may be located on one computer and / or distributed between two or more computers. Furthermore, these components may execute from various computer-readable media that store various data structures. For example, components may communicate by using local and / or remote processes, for example, based on signals comprising one or more data packets (e.g., data from two components interacting with other components in a local system, a distributed system, and / or data across a network such as the Internet interacting with other systems using signals).

[0399] Those skilled in the art may recognize that, in combination with the illustrative logical blocks described in the embodiments disclosed herein, the steps may be realized by electronic hardware or a combination of computer software and electronic hardware. Whether a function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to realize the described functions for each specific application, but the implementation method should not be considered to go beyond the scope of this application.

[0400] Those skilled in the art can clearly understand that for the purpose of convenient and concise description, the detailed operation processes of the above systems, devices and units may be referred to the corresponding processes in the above method embodiments, and the details will not be described again in this specification.

[0401] In some embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are merely examples. For example, the division into units is merely a logical division of function, and other divisions may be used in actual implementations. For example, multiple units or components may be combined or integrated into other systems, or some features may be omitted or not implemented. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be realized through some interfaces. Indirect couplings or communication connections between devices or units may be realized in electrical, mechanical, or other forms.

[0402] The units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units, in other words, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

[0403] Furthermore, the functional units in the embodiments of this application may be integrated into one processing unit, each of the units may exist physically alone, or two or more units may be integrated into one unit. When the functions are realized in the form of software functional units and sold or used as independent products, the functions may be stored in a computer-readable storage medium.

[0404] The above description is merely a specific implementation of this application and is not intended to limit the scope of protection of this application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. 1. A communication method comprising: receiving, by a first terminal device, a power control parameter from a network device, the power control parameter having an association relationship with a resource pool of sidelink positioning reference signals; determining, by the first terminal device, a target transmit power based on the power control parameter; transmitting, by the first terminal device, a first sidelink positioning reference signal based on the target transmission power; A method comprising:

2. the power control parameters include one or more of a first parameter, a second parameter, or a third transmit power; The first parameter includes a third parameter and / or a downlink path loss adjustment factor, and the third parameter is an initial power control value based on a downlink path loss of the first terminal device; the second parameter includes a fourth parameter and / or a sidelink pathloss adjustment factor, the fourth parameter being an initial power control value based on a sidelink pathloss of the first terminal device; 2. The method of claim 1, wherein the third transmit power comprises a transmit power of the network device based on a channel busy ratio (CBR) of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal.

3. determining, by the first terminal device, a target transmission power based on the power control parameter, determining, by the first terminal device, the target transmission power based on a first transmission power and / or a second transmission power; 3. The method of claim 2, wherein the first transmit power is determined based on the first parameter and the downlink path loss, and the second transmit power is determined based on the second parameter and the sidelink path loss.

4. Before determining, by the first terminal device, the target transmission power based on the first transmission power and / or the second transmission power, the method includes: receiving, by the first terminal device, first information from a second terminal device, the first information including information on a received power of a sidelink signal from the first terminal device or information on the sidelink path loss, or information on a transmission power of a sidelink signal transmitted by the second terminal device; determining, by the first terminal device, the sidelink path loss based on the first information; The method of claim 3 further comprising:

5. The first information includes the following content: information regarding a received power of a first sidelink signal, the first sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and a type of the first sidelink signal including a sidelink positioning reference signal; information regarding a received power of a second sidelink signal, the second sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and a type of the second sidelink signal including a Physical Sidelink Shared Channel (PSSCH) Demodulation Reference Signal (DMRS) or a Physical Sidelink Control Channel (PSCCH) DMRS; information about the sidelink pathloss, wherein the information about the sidelink pathloss is determined based on the first sidelink signal or the second sidelink signal; information regarding a transmission power of a third sidelink signal, the third sidelink signal being from a second terminal device, and a type of the third sidelink signal including a sidelink positioning reference signal; or and information regarding a transmit power of a fourth sidelink signal, the fourth sidelink signal being from the second terminal device, the third sidelink signal including a sidelink positioning reference signal, and a type of the fourth sidelink signal including a PSSCH DMRS or a PSCCH DMRS. The method of claim 4, comprising at least one of:

6. Before receiving, by the first terminal device, the first information from the second terminal device, the method includes: transmitting, by the first terminal device, first configuration information to the second terminal device, the first configuration information indicating information regarding a sidelink signal used to determine the sidelink pathloss; The first configuration information includes the following content: information regarding a first signal type, the first signal type being a type of the sidelink signal used to determine the sidelink pathloss, the first signal type comprising a sidelink positioning reference signal type; a first resource identifier, the first resource identifier comprising a resource identifier of the first sidelink signal; or a first resource set identifier, the first resource set identifier comprising a resource set identifier corresponding to a resource of the first sidelink signal; The method of claim 5 , comprising at least one of:

7. determining, by the first terminal device, the sidelink path loss based on the first information, determining, by the first terminal device, a quasi-sidelink path loss based on the first information; determining, by the first terminal device, the sidelink pathloss based on the quasi-sidelink pathloss and a first offset, the first offset being determined based on a difference between a frequency of a sidelink signal associated with the quasi-sidelink pathloss and a frequency of the first sidelink positioning reference signal; 7. The method of any one of claims 4 to 6, comprising:

8. Before determining, by the first terminal device, the target transmission power based on the first transmission power and / or the second transmission power, the method includes: determining, by the first terminal device, a fifth transmission power based on the second parameter and the sidelink path loss; determining, by the first terminal device, the second transmission power based on the fifth transmission power and a second offset, the second offset being determined based on a difference between a frequency of a sidelink signal associated with the sidelink path loss and a frequency of the first sidelink positioning reference signal; The method of any one of claims 4 to 6, further comprising:

9. determining, by the first terminal device, the target transmission power based on a first transmission power and / or a second transmission power, 9. The method according to claim 3, further comprising: determining, by the first terminal device, the target transmission power based on a smaller value of one or more of a first value, the third transmission power, or a fourth transmission power, wherein the first value is the smaller value of the first transmission power and the second transmission power, and the fourth transmission power comprises a transmission power of the first terminal device.

10. Before determining, by the first terminal device, a target transmission power based on the power control parameter, the method further comprises: transmitting, by the first terminal device, a second sidelink positioning reference signal; receiving, by the first terminal device, a power feedback parameter from a second terminal device, the power feedback parameter being determined based on a received power of the second sidelink positioning reference signal and a received power of a sidelink positioning reference signal that the second terminal device expects to receive; Further comprising: determining, by the first terminal device, a target transmission power based on the power control parameter, The method according to any one of claims 3 to 9, comprising determining, by the first terminal device, the target transmission power based on the power control parameter and the power feedback parameter.

11. 1. A communication method comprising: determining, by a network device, a power control parameter, the power control parameter having an association relationship with a resource pool of sidelink positioning reference signals; transmitting, by the network device, the power control parameter to a first terminal device, the power control parameter being used by the first terminal device to determine a target transmit power for transmitting a first sidelink positioning reference signal; A method comprising:

12. the power control parameters include one or more of a first parameter, a second parameter, or a third transmit power; The first parameter includes a third parameter and / or a downlink path loss adjustment factor, and the third parameter is an initial power control value based on a downlink path loss of the first terminal device; the second parameter includes a fourth parameter and / or a sidelink pathloss adjustment factor, the fourth parameter being an initial power control value based on a sidelink pathloss of the first terminal device; 12. The method of claim 11, wherein the third transmit power comprises a transmit power of the network device based on a channel busy ratio (CBR) of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal.

13. The method comprises: transmitting, by the network device, first configuration information to a second terminal device, the first configuration information indicating information regarding a sidelink signal used to determine a sidelink pathloss; The first configuration information includes the following content: information regarding a first signal type, the first signal type being a type of the sidelink signal used to determine the sidelink pathloss, the first signal type comprising a sidelink positioning reference signal type; a first resource identifier, the first resource identifier comprising a resource identifier of the first sidelink signal; or a first resource set identifier, the first resource set identifier comprising a resource set identifier corresponding to a resource of the first sidelink signal; 13. The method of claim 11 or 12, comprising at least one of:

14. A communication apparatus for use in a first terminal device, the communication apparatus including a communication interface and a processor, The processor: and configured to receive, via the communication interface, a power control parameter from a network device, the power control parameter having an association relationship with a resource pool of sidelink positioning reference signals; determining a target transmit power based on the power control parameters; 11. The communications device configured to transmit, via the communications interface, a first sidelink positioning reference signal based on the target transmit power.

15. the power control parameters include one or more of a first parameter, a second parameter, or a third transmit power; The first parameter includes a third parameter and / or a downlink path loss adjustment factor, and the third parameter is an initial power control value based on a downlink path loss of the first terminal device; the second parameter includes a fourth parameter and / or a sidelink pathloss adjustment factor, the fourth parameter being an initial power control value based on a sidelink pathloss of the first terminal device; 15. The communication apparatus of claim 14, wherein the third transmit power comprises a transmit power of the network device based on a channel busy ratio (CBR) of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal.

16. The processor: specifically configured to determine the target transmission power based on a first transmission power and / or a second transmission power; 16. The communication device according to claim 15, wherein the first transmission power is determined based on the first parameter and the downlink path loss, and the second transmission power is determined based on the second parameter and the sidelink path loss.

17. The processor: and further configured to receive first information from a second terminal device through the communication interface, the first information comprising information on a received power of a sidelink signal from the first terminal device or information on the sidelink path loss, or information on a transmission power of a sidelink signal transmitted by the second terminal device.

17. The communications device of claim 16, further configured to determine the sidelink path loss based on the first information.

18. The first information includes the following content: information regarding a received power of a first sidelink signal, the first sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and a type of the first sidelink signal including a sidelink positioning reference signal; information regarding a received power of a second sidelink signal, the second sidelink signal being a sidelink signal received by the second terminal device from the first terminal device, and a type of the second sidelink signal including a Physical Sidelink Shared Channel (PSSCH) Demodulation Reference Signal (DMRS) or a Physical Sidelink Control Channel (PSCCH) DMRS; information about the sidelink pathloss, wherein the information about the sidelink pathloss is determined based on the first sidelink signal or the second sidelink signal; information regarding a transmission power of a third sidelink signal, the third sidelink signal being from a second terminal device, and a type of the third sidelink signal including a sidelink positioning reference signal; or and information regarding a transmit power of a fourth sidelink signal, the fourth sidelink signal being from the second terminal device, the third sidelink signal including a sidelink positioning reference signal, and a type of the fourth sidelink signal including a PSSCH DMRS or a PSCCH DMRS.

18. The communication device of claim 17, comprising at least one of:

19. The processor: and transmitting, via the communication interface, first configuration information to the second terminal device, the first configuration information indicating information about a sidelink signal used to determine the sidelink pathloss. The first configuration information includes the following content: information regarding a first signal type, the first signal type being a type of the sidelink signal used to determine the sidelink pathloss, the first signal type comprising a sidelink positioning reference signal type; a first resource identifier, the first resource identifier comprising a resource identifier of the first sidelink signal; or a first resource set identifier, the first resource set identifier comprising a resource set identifier corresponding to a resource of the first sidelink signal; 20. The communication device of claim 18, comprising at least one of:

20. The processor: determining a quasi-sidelink path loss based on the first information; 20. The communications device of claim 17, wherein the communications device is specifically configured to determine the sidelink pathloss based on the quasi-sidelink pathloss and a first offset, the first offset being determined based on a difference between a frequency of a sidelink signal associated with the quasi-sidelink pathloss and a frequency of the first sidelink positioning reference signal.

21. The processor: determining a fifth transmission power based on the second parameter and the sidelink path loss; 20. The communications device of claim 17, wherein the communications device is specifically configured to determine the second transmission power based on the fifth transmission power and a second offset, the second offset being determined based on a difference between a frequency of a sidelink signal associated with the sidelink path loss and a frequency of the first sidelink positioning reference signal.

22. The processor: specifically configured to determine the target transmit power based on a smaller value of one or more of a first value, the third transmit power, or a fourth transmit power; 22. The communication device according to claim 16, wherein the first value is a smaller value of the first transmission power and the second transmission power, and the fourth transmission power includes a transmission power of the first terminal device.

23. The processor: transmitting a second sidelink positioning reference signal over the communication interface; and receiving a power feedback parameter from a second terminal device, the power feedback parameter being determined based on a received power of the second sidelink positioning reference signal and a received power of a sidelink positioning reference signal that the second terminal device expects to receive.

23. The communications device of claim 16, wherein the processor is specifically configured to determine the target transmit power based on the power control parameter and the power feedback parameter.

24. 1. A communication device including a communication interface and a processor, The processor: and configured to determine a power control parameter, the power control parameter having an association relationship with a resource pool of sidelink positioning reference signals; 11. The communications apparatus of claim 10, wherein the power control parameter is configured to transmit, via the communications interface, to a first terminal device, the power control parameter being used by the first terminal device to determine a target transmit power for transmitting a first sidelink positioning reference signal.

25. the power control parameters include one or more of a first parameter, a second parameter, or a third transmit power; The first parameter includes a third parameter and / or a downlink path loss adjustment factor, and the third parameter is an initial power control value based on a downlink path loss of the first terminal device; the second parameter includes a fourth parameter and / or a sidelink pathloss adjustment factor, the fourth parameter being an initial power control value based on a sidelink pathloss of the first terminal device; 25. The communications apparatus of claim 24, wherein the third transmit power comprises a transmit power of the network device based on a channel busy ratio (CBR) of a resource pool corresponding to the first sidelink positioning reference signal and a transmission priority corresponding to the first sidelink positioning reference signal.

26. The processor: and transmitting, via the communication interface, first configuration information to a second terminal device, the first configuration information indicating information about a sidelink signal used to determine a sidelink pathloss. The first configuration information includes the following content: information regarding a first signal type, the first signal type being a type of the sidelink signal used to determine the sidelink pathloss, the first signal type comprising a sidelink positioning reference signal type; a first resource identifier, the first resource identifier comprising a resource identifier of the first sidelink signal; or a first resource set identifier, the first resource set identifier comprising a resource set identifier corresponding to a resource of the first sidelink signal; 26. A communication device according to claim 24 or 25, comprising at least one of:

27. A communications device including a processor and a memory, the memory is configured to store computer programs or instructions; 14. A communications device, wherein the processor is configured to execute the computer program or instructions in the memory, such that a method according to any one of claims 1 to 10 is performed, or such that a method according to any one of claims 11 to 13 is performed.

28. A communication device including a processing module and a communication module, A communication device, wherein the processing module is configured to perform the method of any one of claims 1 to 10 or to perform the method of any one of claims 11 to 13 through the communication module.

29. 1. A computer-readable storage medium, comprising: The computer-readable storage medium stores computer-executable instructions that, when invoked by a computer, cause the method of any one of claims 1 to 10 to be performed, or the method of any one of claims 11 to 13 to be performed.

30. A chip system including a communication interface and a processor, the communication interface is configured to input and / or output signaling or data; A chip system, wherein the processor is configured to execute a computer-executable program, such that a device in which the chip system is installed performs the method of any one of claims 1 to 10 or the method of any one of claims 11 to 13.

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