Communication method and apparatus

Abstract

The present application relates to a communication method and apparatus. A remote device receives measurement configuration information used to configure a measurement event. The measurement event is an event in which the signal quality of a candidate relay device becomes better than the signal quality of a serving relay device by a first offset. The remote device transmits a measurement report to a network device, the measurement report including a first measurement result and first indication information. The first measurement result is a result of a measurement performed by the remote device based on the measurement event, and the first indication information indicates a measurement type corresponding to the first measurement result. The measurement report transmitted by the remote device to the network device may include the first indication information to indicate a measurement type corresponding to the measurement result. For example, whether the measurement result is SL-RSRP or SD-RSRP may be determined based on the first indication information. In this way, the network device can consider more factors when determining whether the remote device should perform a path switch, to improve the network device's decision accuracy.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202211558857.6 entitled "SL RELAY MEASUREMENT METHOD" filed with the State Intellectual Property Office of China on December 6, 2022, Chinese Patent Application No. 202211717133.1 entitled "COMMUNICATION METHOD AND APPARATUS" filed with the State Intellectual Property Office of China on December 29, 2022, and Chinese Patent Application No. 202310166316.7 entitled "COMMUNICATION METHOD AND APPARATUS" filed with the State Intellectual Property Office of China on February 16, 2023, all of which are incorporated herein by reference in their entireties.

[0002] The present application relates to the field of communication technologies, and more particularly to communication methods and devices. [Background technology]

[0003] A remote user equipment (UE) can access a network through a relay UE. Specifically, the remote UE may be connected to the network via an indirect path between the remote UE and a relay UE. In addition, to ensure service continuity for the remote UE, path switching of the remote UE between indirect paths is considered. In other words, the remote UE may switch from one indirect path to another. To perform path switching or relay UE reselection, the remote UE typically performs measurements before performing path switching or relay UE reselection based on measurement results. Therefore, it is currently under discussion whether Z2 measurement events are supported, i.e., whether a candidate relay UE has a better offset than the serving relay UE. A network device can configure Z2 measurement events for the remote UE. The remote UE may measure the sidelink (SL) channel quality of the candidate relay UE and the serving relay UE on the indirect link based on the configuration of the network device, and report the measurement result to the network device when the Z2 measurement event is met, so that the network device can decide whether the remote UE should perform path switching or relay UE reselection.

[0004] The remote UE may measure the SL-reference signal received power (RSRP) or sidelink discovery (SD)-RSRP of the relay UE, which is used as the measurement result of the SL channel quality of the relay UE. SL-RSRP is obtained by measuring SL unicast data, and SD-RSRP is obtained by measuring discovery messages on the SL path. The transmit power of the SL unicast data is the result of power control performed based on the SL path loss, and power control is not performed on the transmit power of the discovery message based on the SL path loss. Therefore, the SL-RSRP may not match the SD-RSRP. For example, the measurement result of the candidate relay UE is SD-RSRP, and the measurement result of the serving relay UE is SL-RSRP. The measurement result obtained by the remote UE indicates that the measurement result of the candidate relay UE is offset better than the measurement result of the serving relay UE, but the actual channel quality of the serving relay UE may be good. Because power control is performed on the transmission power of the SL unicast data based on the SL path loss, the SL-RSRP corresponding to the SL unicast data is low. In this case, the network device determines whether the remote UE should perform path switching or relay UE reselection based on the measurement result. The determination result may be inaccurate.

[0005] It can be seen that currently, the accuracy of determining whether the remote UE should perform path switching or relay UE reselection is not high. Alternatively, in another scenario in which another device may determine whether the remote UE should perform path switching or relay UE reselection, there is a similar problem that the accuracy of the determination result is not high. Summary of the Invention

[0006] SUMMARY OF THE INVENTION Embodiments of the present application provide a communication method and apparatus for improving the accuracy with which a remote device determines whether to perform a path switch.

[0007] In the description of this part, determining whether the remote UE performs a path switch may be understood as determining whether the remote UE performs a path switch, or determining whether the remote UE performs a relay UE reselection (e.g., reselecting a serving relay UE). [Means for solving the problem]

[0008] According to a first aspect, a first communication method is provided. The method may be executed by a remote device, or by another device including the functionality of the remote device, or by a chip system (or chip) or another functional module. The chip system or functional module may implement the functionality of the remote device. The chip system or functional module may be, for example, located in the remote device. The remote device may be, for example, a terminal device or a network device. The method includes: receiving measurement configuration information, the measurement configuration information including a measurement event, where the measurement event is an event in which the signal quality of a candidate relay device becomes better than the signal quality of a serving relay device by a first offset; and transmitting a measurement report to the network device, the measurement report including a first measurement result and first indication information, where the first measurement result is a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicates a measurement type corresponding to the first measurement result.

[0009] In this embodiment of the present application, the measurement report sent by the remote device to the network device may include first indication information to indicate a measurement type corresponding to the measurement result. For example, whether the measurement result is SL-RSRP or SD-RSRP may be determined based on the first indication information. In this way, the network device can consider more factors when determining whether the remote device should perform path switching, so as to improve the decision accuracy of the network device.

[0010] In an optional implementation, the measurement type corresponding to the first measurement result includes one or more of the following: the measurement result of the first relay device is SL-RSRP, the measurement result of the first relay device is SD-RSRP, the measurement result of the second relay device is SL-RSRP, the measurement result of the second relay device is SD-RSRP, whether the measurement result of the first relay device is SL-RSRP, or whether the measurement result of the second relay device is SL-RSRP. The first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device.

[0011] In an optional implementation, the measurement report further indicates a first path loss and / or a second path loss, or the first measurement result indicates the first path loss and / or the second path loss. The first path loss is a sidelink path loss between the remote device and the first relay device, the second path loss is a sidelink path loss between the remote device and the second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device. The remote device can further report the SL path loss together, so that the network device can further determine whether the remote device will perform a path switch by referring to the SL path loss, thereby further improving the decision accuracy of the network device.

[0012] In an optional implementation, indicating the first path loss includes including a value of the first path loss or including second indication information, where the second indication information indicates a range to which the first path loss value belongs or indicates whether the first path loss value is greater than a first threshold. The measurement report or the first measurement result may directly include the value of the first path loss if the indication is clear, or may indicate a range of the first path loss to help reduce the transmission overhead of the measurement report. The manner in which the measurement report or the first measurement result indicates the second path loss is similar.

[0013] In an optional implementation, the method further includes transmitting first request information to the first relay device, the first request information being used to inquire about sidelink power control information of the first relay device or to inquire about sidelink path loss of the first relay device, and receiving first information from the first relay device, the first information indicating whether the first relay device performs sidelink power control based on the sidelink path loss or indicating the first path loss. To report the first path loss, the remote device can first obtain the first path loss. For example, one way in which the remote device obtains the first path loss is for the remote device to calculate the first path loss by itself. In another example, another way in which the remote device obtains the first path loss is for the remote device to receive the first path loss from the first relay device.

[0014] In an optional implementation, the method further includes transmitting second request information to the second relay device, the second request information being used to inquire about sidelink power control information of the second relay device or to inquire about sidelink pathloss of the second relay device, and receiving second information from the second relay device, the second information indicating whether the second relay device performs sidelink power control based on the sidelink pathloss or indicating the second pathloss. To report the second pathloss, the remote device can first acquire the second pathloss. For example, one way in which the remote device acquires the second pathloss is for the remote device to calculate the second pathloss by itself. In another example, another way in which the remote device acquires the second pathloss is for the remote device to receive the second pathloss from the second relay device.

[0015] In an optional implementation, sending a measurement report corresponding to the measurement event to the network device includes sending a measurement report to the network device when the measurement result of the first relay device is smaller than a second threshold and / or the sidelink path loss between the remote device and the first relay device is greater than a third threshold, where the first relay device is a serving relay device of the remote device. When the measurement result of the first relay device acquired by the remote device is smaller than (or equal to or smaller than) the second threshold, it indicates that the SL channel quality between the first relay device and the remote device is not good. In this case, the remote device may consider a path switch and therefore may send the measurement report. When the SL path loss between the remote device and the first relay device is greater than (or equal to or greater than) the third threshold, it indicates that the distance between the remote device and the first relay device is long. In this case, if the measurement event is met, it may indicate that the SL channel quality between the remote device and the second relay device is greater than the SL channel quality between the remote device and the first relay device. In this case, the remote device can consider a path switch and send a measurement report accordingly.

[0016] In an optional implementation, the method further includes: determining, if a measurement result of the first relay device is smaller than a second threshold and / or a sidelink path loss between the remote device and the first relay device is larger than a third threshold, a first measurement offset to be used for measurements in the configured measurement event, the first measurement offset being one of the at least one first offset for the same measurement event; and determining, if a measurement result of the first relay device is larger than the second threshold and / or a sidelink path loss between the remote device and the first relay device is smaller than the third threshold, a second measurement offset to be used for measurements in the configured measurement event, the second measurement offset being one of the at least one first offset for the same measurement event. If the measurement result satisfies the measurement event, the remote device transmits a measurement report; if the measurement result does not satisfy the measurement event, the remote device skips transmitting the measurement report. In this way, the remote device determines a more appropriate first offset based on the condition between the remote device and the first relay device to appropriately trigger a report to the network device.

[0017] In an optional implementation, the method further includes skipping sending a measurement report if the measurement result of the first relay device is greater than (or equal to) a second threshold and / or the sidelink path loss between the remote device and the first relay device is less than (or equal to) a third threshold, where the first relay device is a serving relay device for the remote device. If the measurement result of the first relay device acquired by the remote device is greater than (or equal to) the second threshold, it indicates that the SL channel quality between the first relay device and the remote device is good. The remote device may not need to perform a path switch and therefore may not send a measurement report. In this case, the network device does not need to determine whether the remote device will perform a path switch. If the SL path loss between the remote device and the first relay device is less than (or equal to) the third threshold, it indicates that the distance between the remote device and the first relay device is short. In this case, if the measurement event is met, the first relay device performs SL power control based on the SL path loss, so the transmit power of the first relay device may be low. Therefore, the remote device may not need to perform a path switch and may not send a measurement report, in which case the network device does not need to determine whether the remote device will perform a path switch.

[0018] In an optional implementation, the method further includes starting measurements of candidate relay devices for the remote device when the measurement result of the first relay device is smaller than a second threshold and / or the sidelink path loss between the remote device and the first relay device is greater than a third threshold, where the first relay device is a serving relay device for the remote device. When the measurement result of the first relay device acquired by the remote device is smaller than (or equal to or smaller than) the second threshold, it indicates that the SL channel quality between the first relay device and the remote device is not good. In this case, the remote device can consider path switching and therefore start measurements for candidate relay devices. When the SL path loss between the remote device and the first relay device is greater than (or equal to or greater than) the third threshold, it indicates that the distance between the remote device and the first relay device is long. In this case, if a measurement event is met, it can indicate that the SL channel quality between the remote device and the second relay device is greater than the SL channel quality between the remote device and the first relay device. In this case, the remote device can consider switching paths and therefore initiate measurements on candidate relay devices.

[0019] In an optional implementation, the method further includes skipping measuring the candidate relay device for the remote device if the measurement result of the first relay device is greater than a second threshold and / or the sidelink path loss between the remote device and the first relay device is less than a third threshold, where the first relay device is a serving relay device for the remote device. If the measurement result of the first relay device acquired by the remote device is greater than (or greater than) the second threshold, it indicates that the SL channel quality between the first relay device and the remote device is good. The remote device may not need to perform path switching and therefore may not need to measure the candidate relay device. If the SL path loss between the remote device and the first relay device is less than (or equal to) the third threshold, it indicates that the distance between the remote device and the first relay device is short. In this case, if the measurement event is met, the first relay device performs SL power control based on the SL path loss, so the transmit power of the first relay device may be low. Therefore, the remote device may not need to measure the candidate relay device.

[0020] In an optional implementation, the measurement configuration information includes information about at least one measurement scheme corresponding to the measurement event, where different measurement schemes correspond to different first offsets, or different measurement schemes correspond to the same first offset. Different first offsets may be configured for different measurement schemes, so that the first offsets can compensate for errors caused by different measurement types in the corresponding measurement schemes. Alternatively, to simplify the configuration process and simplify the implementation of the remote device, the same first offset may be configured for different measurement schemes.

[0021] In an optional implementation, the at least one measurement scheme includes one or more of the following: measuring the SL-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay device; measuring the SD-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay device; measuring the SL-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay device; or measuring the SD-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay device.

[0022] In an optional implementation, the measurement configuration information is further used to configure one or more of the following: whether to report a measurement type corresponding to a measurement result of a measurement event, whether to report a sidelink path loss, a first threshold used by the remote device to determine the sidelink path loss indicated by the measurement report, a second threshold corresponding to a measurement result of a first relay device and used by the remote device to decide whether to send a measurement report or to measure a candidate relay device, the first relay device being the remote device's serving relay device, a second threshold, or a third threshold, the third threshold being a sidelink path loss threshold and used by the remote device to decide whether to send a measurement report or to measure a candidate relay device. The above-mentioned parameters may be configured by using the measurement configuration information, or may be predefined in the protocol, or may be preconfigured at the remote device.

[0023] According to a second aspect, a second communication method is provided. The method may be performed by a network device, another device including a function of the network device, or a chip system (or chip) or another functional module. The chip system or functional module can implement the function of the network device. The chip system or functional module may be disposed in, for example, the network device. The network device may include, for example, an access network device and / or a core network device. The access network device may be, for example, a base station. The method includes: transmitting measurement configuration information to a remote device, the measurement configuration information including a measurement event, where the measurement event is an event in which the signal quality of a candidate relay device becomes better than the signal quality of a serving relay device by a first offset; and receiving a measurement report corresponding to the measurement configuration information from the remote device, the measurement report including a first measurement result and first indication information, where the first measurement result is a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicates a measurement type corresponding to the first measurement result.

[0024] In an optional implementation, the measurement type corresponding to the first measurement result includes one or more of the following: the measurement result of the first relay device is SL-RSRP, the measurement result of the first relay device is SD-RSRP, the measurement result of the second relay device is SL-RSRP, the measurement result of the second relay device is SD-RSRP, whether the measurement result of the first relay device is SL-RSRP, or whether the measurement result of the second relay device is SL-RSRP. The first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device.

[0025] In an optional implementation, the measurement report further indicates a first path loss and / or a second path loss, or the first measurement result indicates a first path loss and / or a second path loss, where the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device.

[0026] In an optional implementation, indicating the first path loss includes including a value of the first path loss or including second indication information, where the second indication information indicates a range to which the first path loss value belongs or indicates whether the first path loss value is greater than a first threshold.

[0027] In an optional implementation, the measurement configuration information includes information about at least one measurement scheme corresponding to the measurement event, where different measurement schemes correspond to different first offsets or different measurement schemes correspond to the same first offset.

[0028] In an optional implementation, the at least one measurement scheme includes one or more of the following: measuring the SL-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay device; measuring the SD-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay device; measuring the SL-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay device; or measuring the SD-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay device.

[0029] In optional implementations, the measurement configuration information is further used to configure one or more of the following: whether to report a measurement type corresponding to a measurement result of a measurement event; whether to report a sidelink pathloss; a first threshold used by the remote device to determine a sidelink pathloss indicated by the measurement report; a second threshold corresponding to a measurement result of a first relay device and used by the remote device to decide whether to send a measurement report or to measure a candidate relay device, the first relay device being a serving relay device for the remote device; or a third threshold, the third threshold being a sidelink pathloss threshold and used by the remote device to decide whether to send a measurement report or to measure a candidate relay device.

[0030] For technical effects provided by the second aspect or optional implementations, please refer to the description of the technical effects of the first aspect or the corresponding implementations.

[0031] According to a third aspect, a third communication method is provided. The method may be performed by a remote device, or by another device including the functionality of the remote device, or by a chip system (or chip) or another functional module. The chip system or functional module may implement the functionality of the remote device. The chip system or functional module may be, for example, located in the remote device. The remote device may be, for example, a terminal device or a network device. The method includes receiving measurement configuration information, the measurement configuration information including measurement events, and transmitting a measurement report to the network device, the measurement report including measurement results corresponding to at least one measurement event in the measurement events. The measurement configuration information includes any one or more of the following measurement events: an event in which the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset; an event in which the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset; an event in which the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset; or an event in which the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset.

[0032] In this embodiment of the present application, the network device may configure different measurement events to distinguish measurement types, so that the network device can know the specific situation on the current SL and also obtain more information for the remote device to determine whether to perform path switching, which reduces the probability that the network device will inappropriately or erroneously determine whether the remote device will perform path switching.

[0033] In an optional implementation, any multiple items in the first offset, second offset, third offset, and fourth offset are equal or not exactly equal.

[0034] In an optional implementation, the measurement report further indicates a first path loss and / or a second path loss, or the first measurement result indicates a first path loss and / or a second path loss, where the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device.

[0035] In an optional implementation, indicating the first path loss includes including a value of the first path loss or including second indication information, where the second indication information indicates a range to which the first path loss value belongs or indicates whether the first path loss value is greater than a first threshold.

[0036] In an optional implementation, the method further includes transmitting first request information to the first relay device, the first request information being used to inquire about sidelink power control information of the first relay device or to inquire about a sidelink path loss of the first relay device; and receiving first information from the first relay device, the first information indicating whether the first relay device performs sidelink power control based on the sidelink path loss or indicating the first path loss.

[0037] In an optional implementation, the method further includes transmitting second request information to the second relay device, where the second request information is used to inquire about sidelink power control information of the second relay device or to inquire about a sidelink pathloss of the second relay device, and receiving second information from the second relay device, where the second information indicates whether the second relay device performs sidelink power control based on the sidelink pathloss or indicates the second pathloss.

[0038] In an optional implementation, sending a measurement report corresponding to the measurement event to the network device includes sending the measurement report to the network device if the measurement result of the first relay device is less than a second threshold and / or the sidelink path loss between the remote device and the first relay device is greater than a third threshold, and the first relay device is a serving relay device of the remote device.

[0039] In an optional implementation, the method further includes skipping sending the measurement report if the measurement result of the first relay device is greater than a second threshold and / or the sidelink path loss between the remote device and the first relay device is less than a third threshold, and the first relay device is a serving relay device of the remote device.

[0040] In an optional implementation, the method further includes initiating measurements of candidate relay devices for the remote device if the measurement result of the first relay device is less than a second threshold and / or the sidelink path loss between the remote device and the first relay device is greater than a third threshold, where the first relay device is a serving relay device for the remote device.

[0041] In an optional implementation, the method further includes skipping measuring the candidate relay devices of the remote device if the measurement result of the first relay device is greater than a second threshold and / or the sidelink path loss between the remote device and the first relay device is less than a third threshold, and the first relay device is a serving relay device of the remote device.

[0042] In optional implementations, the measurement configuration information is further used to configure one or more of the following: whether to report sidelink pathloss; a first threshold used by the remote device to determine the sidelink pathloss indicated by the measurement report; a second threshold corresponding to a measurement result of a first relay device, used by the remote device to decide whether to send a measurement report or to measure a candidate relay device, the first relay device being a serving relay device for the remote device; or a third threshold, the third threshold being a sidelink pathloss threshold, used by the remote device to decide whether to send a measurement report or to measure a candidate relay device.

[0043] For technical effects provided by optional implementation forms of the third aspect, please refer to the description of the technical effects of the first aspect or the corresponding implementation forms.

[0044] According to a fourth aspect, a fourth communication method is provided. The method may be performed by a network device, by another device including the functionality of the network device, or by a chip system (or chip) or another functional module. The chip system or functional module can implement the functionality of the network device. The chip system or functional module is, for example, located within the network device. The network device includes, for example, an access network device and / or a core network device. The access network device is, for example, a base station. The method includes transmitting measurement configuration information to a remote device, the measurement configuration information including measurement events; and receiving measurement reports from the remote device, the measurement reports including measurement results corresponding to at least one measurement event within the measurement events, the measurement configuration information including any one or more of the following measurement events: an event in which the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset; an event in which the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset; an event in which the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset; or an event in which the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset.

[0045] In an optional implementation, the measurement report further indicates a first path loss and / or a second path loss, or the first measurement result indicates a first path loss and / or a second path loss, where the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device.

[0046] In an optional implementation, indicating the first path loss includes including a value of the first path loss or including second indication information, where the second indication information indicates a range to which the first path loss value belongs or indicates whether the first path loss value is greater than a first threshold.

[0047] In optional implementations, the measurement configuration information is further used to configure one or more of the following: whether to report sidelink pathloss; a first threshold used by the remote device to determine the sidelink pathloss indicated by the measurement report; a second threshold corresponding to a measurement result of a first relay device, used by the remote device to decide whether to send a measurement report or to measure a candidate relay device, the first relay device being a serving relay device for the remote device; or a third threshold, the third threshold being a sidelink pathloss threshold, used by the remote device to decide whether to send a measurement report or to measure a candidate relay device.

[0048] For technical effects provided by the fourth aspect or optional implementation forms of the fourth aspect, please refer to the description of the technical effects of the third aspect or corresponding implementation forms.

[0049] According to a fifth aspect, a fifth communication method is provided. The method may be executed by a remote device, or by another device including the functionality of the remote device, or by a chip system (or chip) or another functional module. The chip system or functional module may implement the functionality of the remote device. The chip system or functional module may be, for example, disposed in the remote device. The remote device may be, for example, a terminal device or a network device. The method includes receiving configuration information, the configuration information including at least one parameter used to configure a first resource pool, the at least one parameter including a first parameter, the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device; and, if the remote device is out of coverage, ignoring the first parameter, or ignoring the at least one parameter, or considering the first parameter as not configured or provided, or disabling the first parameter, or disabling the sidelink power control performed based on the path loss between the remote device and the network device.

[0050] In this embodiment of the present application, the out-of-coverage remote device may ignore the first parameter, in which case the remote device does not need to perform SL power control based on the path loss of the Uu interface when the remote device is out of coverage, so as to improve the success rate of calculating the SL transmission power and thereby improve the success rate of SL transmission.

[0051] In optional implementations, receiving the configuration information includes receiving the configuration information from the network device via an intermediate device or receiving the configuration information from the intermediate device, where the intermediate device is a serving intermediate device for the remote device.

[0052] In an optional implementation, the configuration information is included in a system message or in an RRC message.

[0053] According to a sixth aspect, a sixth communication method is provided. The method may be executed by a remote device, or by another device including the functionality of the remote device, or by a chip system (or chip) or another functional module. The chip system or functional module may implement the functionality of the remote device. The chip system or functional module may be, for example, disposed in the remote device. The remote device may be, for example, a terminal device or a network device. The method includes: transmitting first indication information, the first indication information indicating that the remote device is out of coverage; and receiving first configuration information, the first configuration information including at least one parameter used to configure a first resource pool, the at least one parameter not including the first parameter, and the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device.

[0054] The remote device can indicate that it is out of coverage. In this case, the remote device does not receive the first parameter. In this way, the out-of-coverage remote device does not need to perform SL power control based on the path loss of the Uu interface, improving the success rate of calculating the SL transmission power and thereby improving the success rate of SL transmission. In addition, the remote device only needs to perform corresponding processing based on the received parameter without changing the execution logic of the remote device.

[0055] In an optional implementation, sending the first instruction information includes sending the first instruction information to the network device via an intermediate device or sending the first instruction information to the intermediate device, where the intermediate device is a serving intermediate device of the remote device.

[0056] In an optional implementation, the first indication information is included in an RRC message, an SUI, a PC5-RRC message, a PC5-S message, or a discovery message.

[0057] According to a seventh aspect, a seventh communication method is provided. The method may be performed by a network device, another device including a function of the network device, or a chip system (or chip) or another functional module. The chip system or functional module may implement the function of the network device. The chip system or functional module may be disposed within the network device. The network device may include, for example, an access network device and / or a core network device. The access network device may be, for example, a base station. The method includes receiving first indication information from a remote device via an intermediate device, the first indication information indicating that the remote device is out of coverage; and transmitting first configuration information, the first configuration information including at least one parameter used to configure a first resource pool, the at least one parameter not including the first parameter, and the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device. In this embodiment of the present application, the network device is enabled to know that the remote device is out of coverage, so that the parameters delivered by the network device can be reduced and transmission overhead can be reduced. In addition, the remote device needs to perform processing based only on the received parameters without changing the SL power control logic of the remote device.

[0058] According to an eighth aspect, an eighth communication method is provided. The method may be performed by a relay device, by another device including the function of the relay device, or by a chip system (or chip) or another functional module. The chip system or functional module can implement the function of the relay device. The chip system or functional module may be, for example, located in the relay device. The relay device may be, for example, a serving relay device of a remote device. The relay device may be, for example, a terminal device or a network device. The method includes receiving first indication information from a remote device, the first indication information indicating that the remote device is out of coverage; receiving second configuration information from a network device, the second configuration information including at least one parameter used to configure a first resource pool for the remote device, the at least one parameter including a first parameter, the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device; and transmitting the first configuration information to the remote device, the first configuration information including another parameter other than the first parameter among the at least one parameter, or ignoring the second configuration information. In this embodiment of the present application, the serving relay device is enabled to know that the remote device is out of coverage, so that parameters transmitted by the serving relay device can be reduced, and transmission overhead can be reduced. Additionally, the remote device needs to perform processing based only on the received parameters without modifying the SL power control logic of the remote device.

[0059] In an optional implementation, the method further includes removing a first parameter included in the second configuration information to obtain the first configuration information.

[0060] According to a ninth aspect, a communication device is provided. The communication device may be a remote device according to any one of the first to eighth aspects. The communication device has a function of the remote device. The communication device is, for example, a remote device, a larger device including the remote device, or a functional module within the remote device, for example, a baseband device or a chip system. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (which may also be referred to as a processing module) and a transceiver unit (which may also be referred to as a transceiver module). The transceiver unit can implement a transmitting function and a receiving function. When the transceiver unit implements a transmitting function, the transceiver unit may be referred to as a transmitting unit (or a transmitting module). When the transceiver unit implements a receiving function, the transceiver unit may be referred to as a receiving unit (or a receiving module). The transmitting unit and the receiving unit may be the same functional module, and the functional module is referred to as a transceiver unit, and the functional module can implement the transmitting function and the receiving function. Alternatively, the transmitting unit and the receiving unit may be different functional modules, and the transceiver unit is a collective term for these functional modules.

[0061] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive measurement configuration information. The measurement configuration information includes a measurement event, where the measurement event is an event where a signal quality of the candidate relay device becomes better than a signal quality of a serving relay device by a first offset. The transceiver unit (or the transmitting unit) is configured to send a measurement report to the network device. The measurement report includes a first measurement result and first indication information, where the first measurement result is a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicates a measurement type corresponding to the first measurement result.

[0062] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive measurement configuration information. The measurement configuration information includes measurement events. The transceiver unit (or the transmitting unit) is configured to transmit a measurement report to the network device. The measurement report includes a measurement result corresponding to at least one measurement event in the measurement events. The measurement configuration information includes any one or more of the following measurement events: an event in which the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset, an event in which the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset, an event in which the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset, or an event in which the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset.

[0063] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive configuration information. The configuration information includes at least one parameter used to configure a first resource pool, the at least one parameter including a first parameter, the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device. The processing unit is configured to ignore the first parameter, or ignore the at least one parameter, or consider the first parameter as not configured or provided, or disable the first parameter, or disable the sidelink power control performed based on the path loss between the remote device and the network device, when the remote device is out of coverage.

[0064] In an optional implementation, the transceiver unit (or the transmitting unit) is configured to transmit first indication information, the first indication information indicating that the remote device is out of coverage. The transceiver unit (or the receiving unit) is configured to receive first configuration information, the first configuration information including at least one parameter used to configure a first resource pool, the at least one parameter not including a first parameter, and the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device.

[0065] In an optional implementation, the communication device further includes a storage unit (sometimes referred to as a storage module). The processing unit is coupled to the storage unit and configured to execute programs or instructions in the storage unit to enable the communication device to perform functions of the remote device according to any one of the first to eighth aspects.

[0066] According to a tenth aspect, there is provided a communication device. The communication device may be a network device according to any one of the first to eighth aspects. The communication device has a function of a network device. The communication device is, for example, a network device, a larger device including a network device, or a functional module within a network device, for example, a baseband device or a chip system. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes referred to as a processing module) and a transceiver unit (sometimes referred to as a transceiver module). For an implementation of the transceiver unit, see the description in the ninth aspect.

[0067] In an optional implementation, the transceiver unit (or the transmitting unit) is configured to transmit measurement configuration information to the remote device. The measurement configuration information includes a measurement event, where the measurement event is an event where a signal quality of the candidate relay device becomes better than a signal quality of the serving relay device by a first offset. The transceiver unit (or the receiving unit) is configured to receive a measurement report corresponding to the measurement configuration information from the remote device. The measurement report includes a first measurement result and first indication information, where the first measurement result is a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicates a measurement type corresponding to the first measurement result.

[0068] In an optional implementation, the transceiver unit (or the transmitting unit) is configured to transmit measurement configuration information to the remote device. The measurement configuration information includes measurement events. The transceiver unit (or the receiving unit) is configured to receive measurement reports from the remote device. The measurement reports include measurement results corresponding to at least one measurement event in the measurement events. The measurement configuration information includes any one or more of the following measurement events: an event in which the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset; an event in which the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset; an event in which the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset; or an event in which the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset.

[0069] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive first indication information from the remote device via the relay device. The first indication information indicates that the remote device is out of coverage. The transceiver unit (or the transmitting unit) is configured to transmit first configuration information. The first configuration information includes at least one parameter used to configure a first resource pool, the at least one parameter not including a first parameter, and the first parameter is used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device.

[0070] In an optional implementation, the communication device further includes a storage unit (sometimes referred to as a storage module). The processing unit is coupled to the storage unit and configured to execute programs or instructions in the storage unit to enable the communication device to perform functions of a network device according to any one of the first to eighth aspects.

[0071] According to an eleventh aspect, there is provided a communication device. The communication device may be a relay device according to any one of the first to eighth aspects. The communication device has the function of the relay device. The communication device is, for example, a relay device, a larger device including the relay device, or a functional module within the relay device, for example, a baseband device or a chip system. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes referred to as a processing module) and a transceiver unit (sometimes referred to as a transceiver module). For an implementation of the transceiver unit, see the description in the ninth aspect.

[0072] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive first indication information from a remote device. The first indication information indicates that the remote device is out of coverage. The transceiver unit (or the receiving unit) is configured to receive second configuration information from the network device. The second configuration information includes at least one parameter used to configure a first resource pool for the remote device, the at least one parameter including a first parameter, and the first parameter is used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device. The transceiver unit (or the transmitting unit) is configured to send the first configuration information to the remote device, wherein the first configuration information includes another parameter other than the first parameter in the at least one parameter, or to ignore the second configuration information.

[0073] In an optional implementation, the communication device further includes a storage unit (sometimes referred to as a storage module). The processing unit is coupled to the storage unit and configured to execute programs or instructions in the storage unit to enable the communication device to perform functions of the relay device according to any one of the first to eighth aspects.

[0074] According to a twelfth aspect, there is provided a communication device. The communication device may be a remote device, or a chip or chip system used in the remote device. The communication device includes a communication interface and a processor, and optionally further includes a memory. The memory is configured to store a computer program. The processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions, the communication device is capable of executing the method performed by the remote device in the above-mentioned aspect.

[0075] According to a thirteenth aspect, there is provided a communication device. The communication device may be a network device, or a chip or chip system used in the network device. The communication device includes a communication interface and a processor, and optionally further includes a memory. The memory is configured to store a computer program. The processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions, the communication device is capable of performing the method performed by the network device in the above-mentioned aspect.

[0076] According to a fourteenth aspect, there is provided a communication device. The communication device may be a relay device, or a chip or chip system used in the relay device. The communication device includes a communication interface and a processor, and optionally further includes a memory. The memory is configured to store a computer program. The processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions, the communication device is capable of performing the method performed by the relay device in the above-mentioned aspect.

[0077] According to a fifteenth aspect, there is provided a communication system including a remote device and a network device. The remote device is configured to perform a remote-device-performed method according to any one of the first to eighth aspects, and the network device is configured to perform a network-device-performed method according to any one of the first to eighth aspects. For example, the remote device may be implemented by using a communication apparatus according to the ninth or twelfth aspect, and the network device may be implemented by using a communication apparatus according to the tenth or thirteenth aspect.

[0078] According to a sixteenth aspect, there is provided another communication system including a remote device and a relay device. The remote device is configured to perform the method performed by the remote device according to any one of the first to eighth aspects, and the relay device is configured to perform the method performed by the relay device according to any one of the first to eighth aspects. For example, the remote device may be implemented by using a communication apparatus according to the ninth or twelfth aspect, and the relay device may be implemented by using a communication apparatus according to the eleventh or fourteenth aspect.

[0079] According to a seventeenth aspect, there is provided a computer-readable storage medium configured to store computer programs or instructions that, when executed, implement the methods performed by the remote device, relay device, or network device in the above-described aspects.

[0080] According to an eighteenth aspect, there is provided a computer program product comprising instructions, which when run on a computer, perform the method in the above aspect.

[0081] According to a nineteenth aspect, there is provided a chip system including a processor and an interface, wherein the processor is configured to call and execute instructions via the interface to enable the chip system to implement the method in the above aspect. [Brief explanation of the drawings]

[0082] [Figure 1A] FIG. 1 is a diagram of an application scenario according to an embodiment of the present application. [Figure 1B] FIG. 1 is a diagram of another application scenario according to an embodiment of the present application. [Figure 2] 2 is a flowchart of a first communication method according to an embodiment of the present application; [Figure 3A]FIG. 2 is a diagram of measurement configuration information according to an embodiment of the present application. [Figure 3B] FIG. 2 is a diagram of measurement configuration information according to an embodiment of the present application. [Figure 4] 4 is a flowchart of a second communication method according to an embodiment of the present application. [Figure 5A] FIG. 2 is another diagram of measurement configuration information according to an embodiment of the present application. [Figure 5B] FIG. 2 is another diagram of measurement configuration information according to an embodiment of the present application. [Figure 6] FIG. 1 is a diagram of another application scenario according to an embodiment of the present application. [Figure 7] 1 is a flowchart of several communication methods according to embodiments of the present application. [Figure 8] 1 is a flowchart of several communication methods according to embodiments of the present application. [Figure 9] 1 is a flowchart of several communication methods according to embodiments of the present application. [Figure 10] 1 is a diagram of an apparatus according to an embodiment of the present application; [Figure 11] FIG. 10 is a diagram of another apparatus according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0083] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following further describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0084] In the embodiments of the present application, unless otherwise specified, the quantity of a noun refers to "singular or plural," i.e., "one or more." "At least one" means one or more, and "plural" means two or more. "And / or" describes an association relationship between associated objects and indicates that three relationships may exist. For example, A and / or B can indicate the following three cases: when only A is present, when both A and B are present, and when only B is present, and A and B may be singular or plural. The character " / " usually indicates an "or" relationship between associated objects. For example, A / B indicates A or B. "At least one of the following items (moieties)" or similar expressions indicates any combination of these items, including any combination of a single item (moiety) or multiple items (moieties). For example, at least one of a, b, or c refers to a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural.

[0085] Ordinal numbers such as "first" and "second" referred to in the embodiments of the present application are used to distinguish between multiple objects, and are not used to limit the size, content, sequence, time sequence, priority, importance, etc. of the multiple objects. In addition, the step numbers in the embodiments described in the present application are intended only to distinguish between different steps, and are not intended to limit the order of the steps. For example, S201 may be performed before S202, after S202, or simultaneously with S202.

[0086] In the following, some terms or concepts in the embodiments of the present application will be explained to facilitate understanding by those skilled in the art.

[0087] (1) In the embodiments of the present application, a terminal device is a device having a wireless transceiver function, and may be a fixed device, a mobile device, a handheld device (e.g., a mobile phone), a wearable device, an in-vehicle device, or a wireless device (e.g., a communication module, a modem, or a chip system) incorporated in the above-mentioned devices. The terminal device is configured to connect people, objects, machines, etc. Terminal devices may be widely used in various scenarios, including, but not limited to, the following scenarios: cellular communication, device-to-device (D2D) communication, V2X, machine-to-machine / machine-type communication (M2M / MTC), internet of things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, unmanned aerial vehicle, robot, etc. Terminal devices may also be referred to as UE, terminal, access station, UE station, remote station, wireless communication device, user equipment, etc.

[0088] In the embodiments of the present application, the communication device configured to implement the functions of the terminal device may be a terminal device, or may be a device, such as a chip system, that can support the terminal device in implementing the functions. The device may be mounted on the terminal device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by using an example in which the device configured to implement the functions of the terminal device is a terminal device.

[0089] For ease of explanation, an example in which the terminal device is a UE is used for description in the embodiments of the present application.

[0090] (2) In the embodiments of the present application, the network device includes, for example, an access network device and / or a core network device. The access network device is a device having a radio transceiver function and configured to communicate with a terminal device. The access network device includes, but is not limited to, a base transceiver station (BTS), NodeB, eNodeB / eNB, or gNodeB / gNB), a transmission reception point (TRP), a subsequent evolution base station in the 3rd generation partnership project (3GPP), an access node in a wireless fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul node, etc. The base station may be a macro base station, a micro base station, a picocell base station, a small cell, a relay station, etc. Multiple base stations may support a network using the same access technology or may support networks using different access technologies. The base station may include one or more co-site or non-co-site transmission reception points. Alternatively, the access network device may be a radio controller, a central unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. Alternatively, the access network device may be a server, etc. For example, a network device in a vehicle-to-everything (V2X) technology may be a road side unit (RSU). The following provides an explanation by using an example in which the access network device is a base station. The base station may communicate with a terminal device or may communicate with the terminal device via a relay station.A terminal device can communicate with multiple base stations using different access technologies. Core network devices are configured to implement functions such as mobility management, data processing, session management, and policy and charging. The names of devices implementing core network functions in systems using different access technologies may be different. This is not limited in the embodiments of the present application. A fifth-generation (5G) mobile communication system is used as an example. The core network devices include an access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), a user plane function (UPF), etc.

[0091] In the embodiments of the present application, the communication device configured to implement the functions of the network device may be a network device, or may be a device, such as a chip system, that can support the network device in implementing the functions. The device may be mounted in the network device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by using an example in which the device configured to implement the functions of the network device is a network device.

[0092] The following describes the technical features of the embodiments of the present application.

[0093] In addition, to ensure service continuity for the remote UE, path switching between indirect paths is considered. In other words, the remote UE may switch from one indirect path to another. To perform path switching, the remote UE typically performs measurements before performing path switching based on measurement results. Therefore, currently, it is being discussed whether a Z2 measurement event is supported, i.e., whether the candidate relay UE has a better offset than the serving relay UE. A candidate relay UE having a better offset than the serving relay UE may mean that the SL channel quality of the candidate relay UE has a better offset than the SL channel quality of the serving relay UE. The network device can configure a Z2 measurement event for the remote UE. The remote UE may measure the SL channel quality of the candidate relay UE and the serving relay UE on the indirect link based on the configuration of the network device, and report the measurement result to the network device when the Z2 measurement event is met, so that the network device can determine whether the remote UE should perform path switching.

[0094] The remote UE can measure the SL-RSRP or SD-RSRP of the relay UE, which is used as a measurement result of the SL channel quality of the relay UE. SL-RSRP is obtained by measuring SL unicast data, and SD-RSRP is obtained by measuring discovery messages on the SL path. If an SL unicast connection exists between the remote UE and the relay UE being measured, both SL unicast data and discovery message transmissions can occur between the two UEs. Therefore, the remote UE can measure the SD-RSRP and / or SL-RSRP of the relay UE. If an SL unicast connection does not exist between the remote UE and the relay UE being measured, discovery messages can occur between the two UEs, but SL unicast data transmissions cannot occur between the two UEs. Therefore, the remote UE can measure the SD-RSRP of the relay UE but cannot measure the SL-RSRP of the relay UE. It is clear that there is an SL unicast connection between the remote UE and its serving relay UE. Therefore, the remote UE can measure the SD-RSRP and / or SL-RSRP of the serving relay UE. There may be an SL unicast connection between the remote UE and the candidate relay UE for the remote UE, or there may be no SL unicast connection between the remote UE and the candidate relay UE for the remote UE. Therefore, the remote UE can measure the SD-RSRP and / or SL-RSRP of the candidate relay UE, or it can measure the SD-RSRP of the candidate relay UE but cannot measure the SL-RSRP of the candidate relay UE. For example, the remote UE can determine whether the measurement result satisfies the Z2 event using the following several determination methods.

[0095] 1. Compare the SL-RSRP of the serving relay UE with the SD-RSRP of the candidate relay UE to determine if the Z2 event is met.

[0096] 2. Compare the SD-RSRP of the serving relay UE with the SD-RSRP of the candidate relay UE to determine if the Z2 event is met.

[0097] 3. Compare the SL-RSRP of the serving relay UE with the SL-RSRP of the candidate relay UE to determine if the Z2 event is met.

[0098] 4. Compare the SD-RSRP of the serving relay UE with the SL-RSRP of the candidate relay UE to determine if the Z2 event is met.

[0099] Currently, a power control mechanism is also used on SL, and the transmitting end UE can perform power control when transmitting SL unicast data. For example, the power control on SL can be performed according to the following relationship: P PSSCH (i)=min(P CMAX ,P MAX,CBR ,min(P PSSCH,D (i),P PSSCH,SL (i)))[dBm] (Formula 1) where P PSSCH (i) represents the transmission power of SL information, for example, SL unicast data. Since the transmission of SL unicast data can be performed through a physical sidelink shared channel (PSSCH), the transmission power of SL unicast data is P PSSCH (i) can be expressed as P CMAX represents the configured maximum output power, e.g., the maximum output power configured for the transmitting UE. P MAX、CBRdepends on the priority of the PSSCH (or SL unicast data) and the channel busy ratio (CBR) range. min(x,y) represents the smaller value of x and y.

[0100] P in Equation 1 PSSCH,D (i) relates to the downlink (DL) parameter dl-P0-PSSCH-physical sidelink control channel (PSCCH). For example, when a network device configures dl-P0-PSSCH-PSCCH for a transmitting end UE,

number

[0101] P O,D is the value given by dl-P0-PSSCH-PSCCH. D is provided by the dl-Alpha-PSSCH-PSCCH configured by the network device. If the network device does not configure a dl-Alpha-PSSCH-PSCCH or if the configured dl-Alpha-PSSCH-PSCCH is D If you do not provide α D is 1.

number

[0102] P in Equation 1 PSSCH,SL (i) is related to the SL parameter sl-P0-PSSCH-PSCCH. For example, if the network device configures sl-P0-PSSCH-PSCCH for the transmitting end UE, and the scheduling instruction of the PSSCH (or SL unicast data) carries a unicast instruction, or the format of the scheduling instruction is format 2-C, then:

number

[0103] P O,SL represents the value given by sl-P0-PSSCH-PSCCH. SLis provided by the sl-Alpha-PSSCH-PSCCH configured by the network device. If the network device does not configure an sl-Alpha-PSSCH-PSCCH or if the configured sl-Alpha-PSSCH-PSCCH is SL If you do not provide α SL is equal to 1.

number

[0104] From the above description, it can be seen that for communication between a remote UE and a relay UE over SL, power control based on SL path loss is applied to SL unicast data. In other words, measurement results corresponding to SL-RSRP may be affected by SL path loss. However, power control based on SL path loss is not applied to discovery messages, i.e., measurement results corresponding to SD-RSRP are not affected by SL path loss. Based on the above description, the remote UE can determine whether the measurement results satisfy the Z2 event using several determination methods. Two different types of measurement results, namely, SL-RSRP and SD-RSRP, are used in the above-mentioned determination method 1 and determination method 4. In this case, the measurement results obtained by the remote UE indicate that the measurement results of the candidate relay UE are offset better than the measurement results of the serving relay UE, but the actual SL channel quality of the serving relay UE may also be good. Because power control is performed on the transmit power of SL unicast data based on SL path loss, the SL-RSRP corresponding to the SL unicast data is lower. In this case, the network device determines whether the remote UE should perform path switching or relay UE reselection based on the measurement result. The determination result may be inaccurate. Similarly, in network-controlled UE-to-UE relay communication, when the remote UE communicates with the UE through the relay UE, whether the remote UE needs to perform path switching to another candidate relay UE to communicate with the UE also has a similar problem.

[0105] Alternatively, in UE-to-UE relay communication determined by a remote UE, the remote UE can determine whether the measurement result satisfies a path switching condition or a relay UE reselection condition using any one of the above-mentioned determination methods. For example, a network device may configure an offset for the remote UE, and the remote UE may compare the measurement result of the serving relay UE with the measurement result of the candidate relay UE based on the offset. However, the remote UE does not know whether the offset applies to SD-RSRP or SL-RSRP. Therefore, the comparison result obtained by the remote UE may be inaccurate. Therefore, the remote UE determines whether the remote UE should perform path switching or relay UE reselection based on the comparison result, and the decision result may also be inaccurate.

[0106] It can be seen that currently, the accuracy of the result of determining whether the network device should make the remote UE perform route switching or whether the remote UE should perform route switching is not high.

[0107] In consideration of this, in an embodiment of the present application, when the network device makes the decision, the measurement report sent by the remote UE to the network device may include first indication information to indicate a measurement type corresponding to the measurement result. For example, whether the measurement result is SL-RSRP or SD-RSRP may be determined based on the first indication information. In this way, the network device can consider more factors when determining whether the remote UE should perform a path switch, so as to improve the decision accuracy of the network device. When the remote UE makes the decision, the remote UE is clear about the correspondence between the first offset and the measurement type, and as a result, the decision result obtained by the remote UE on whether to perform a path switch or relay UE reselection may be more accurate.

[0108] The technical solutions provided in the embodiments of the present application may be applied to a fourth-generation mobile communication technology (4G) system, such as a long-term evolution (LTE) system, or a fifth-generation mobile communication technology (5G) system, such as a new radio (NR) system, or a next-generation mobile communication system or another similar communication system, such as a sixth-generation mobile communication technology (6G) system. This is not particularly limited. The technical solutions provided in the embodiments of the present application may be applied to a device-to-device (D2D) scenario, such as an NR-D2D scenario, or a vehicle-to-everything (V2X) scenario, such as an NR-V2X scenario. For example, the technical solutions may be used in fields such as intelligent driving, assisted driving, or intelligent connected vehicles.

[0109] 1A and 1B illustrate a communication network architecture to which the embodiments of the present application can be applied. FIG. 1A includes a remote UE (remote UE in FIG. 1A), a serving relay UE (serving relay UE in FIG. 1A) for the remote UE, and candidate relay UEs (candidate relay UE1 and candidate relay UE2 in FIG. 1A) for the remote UE. In FIG. 1A, two candidate relay UEs are used as an example. In practice, there may be one or more candidate relay UEs for the remote UE. In addition, FIG. 1A further includes a network device (network device 1 in FIG. 1A) serving the serving relay UE and network devices (network device 2 and network device 3 in FIG. 1A) serving the two candidate relay UEs, respectively. The remote UE may communicate with network device 1, network device 2, or network device 3 through different relay UEs, or may camp on network device 1, network device 2, or network device 3.

[0110] FIG. 1B includes a remote UE (remote UE in FIG. 1B), a serving relay UE (serving relay UE in FIG. 1B) of the remote UE, and a UE communicating with the remote UE through the serving relay UE, and further includes candidate relay UEs (candidate relay UE1 and candidate relay UE2 in FIG. 1B) of the remote UE. In FIG. 1B, two candidate relay UEs are used as an example. In practice, there may be one or more candidate relay UEs for the remote UE. In addition, FIG. 1B further includes a network device serving the remote UE (network device 1 in FIG. 1B) and network devices serving the two candidate relay UEs, respectively (network device 2 and network device 3 in FIG. 1B). The remote UE can communicate with the UE in FIG. 1B via the serving relay UE, candidate relay UE1, or candidate relay UE2. Network device 1, network device 2, or network device 3 may be the same network device or different network devices. For example, in FIG. 1B , the remote UE, the relay UE, and the UEs communicating with the remote UE are all within the coverage of the network device. However, none of the remote UE, the relay UE, and the UEs communicating with the remote UE may be within the area covered by any network device, or only some of the remote UE, the relay UE, and the UEs communicating with the remote UE may be within the coverage of the network device. Whether the remote UE, the relay UE, and the UEs communicating with the remote UE are within the coverage of the network device is not limited.

[0111] 1A and 1B illustrate an example in which relay UEs camp on different network devices. In actual application, a remote UE and a serving relay UE for the remote UE may camp on the same network device or on different network devices. A remote UE and a candidate relay UE for the remote UE may camp on the same network device or on different network devices. A serving relay UE for the remote UE and a candidate relay UE for the remote UE may camp on the same network device or on different network devices. Different candidate relay UEs for the remote UE may camp on the same network device or on different network devices. The network devices in FIGS. 1A and 1B include, for example, access network devices and / or core network devices. Alternatively, FIG. 1B may not include any network devices.

[0112] In order to better describe the embodiments of the present application, the methods provided in the embodiments of the present application will be described below with reference to the accompanying drawings. Optionally, unless otherwise specified, all steps represented by dashed lines in the accompanying drawings herein are optional steps.

[0113] In the description of the embodiments of the present application, determining (or determining) whether a remote UE should perform a path switch may be understood as determining (or determining) whether a remote UE should perform a path switch, or determining (or determining) whether a remote UE should perform relay UE reselection (e.g., reselect a serving relay UE).

[0114] First, a first communication method according to an embodiment of the present application will be described. Figure 2 is a flowchart of the method. The method may be applied to the network architecture shown in Figure 1A or 1B. For example, the remote UE in the method may be the remote UE in Figure 1A or 1B, the first relay UE in the method may be the serving relay UE in Figure 1A or 1B, the second relay UE in the method may be the candidate relay UE 1 or candidate relay UE 2 in Figure 1A or 1B, and the network device in the method may be the network device 1 in Figure 1A or 1B.

[0115] S201: A network device transmits measurement configuration information. Correspondingly, a remote UE (represented as a remote UE in FIG. 2) receives the measurement configuration information from the network device. For example, in the architecture of FIG. 1A, the network device may transmit the measurement configuration information to the remote UE through a serving relay UE of the remote UE (e.g., the first relay UE represented as a first relay UE in FIG. 2). Alternatively, in the architecture of FIG. 1B, the network device may transmit the measurement configuration information directly to the remote UE. Optionally, the network device may transmit the measurement configuration information to the remote UE through an RRC message, or may transmit the measurement configuration information to the remote UE through a system message.

[0116] The measurement configuration information is used to configure measurements, and the measurement configuration may include a measurement report configuration. The measurement report configuration may include a measurement event, and the measurement event is, for example, a Z2 measurement event (event Z2). In an embodiment of the present application, the Z2 measurement event is an event in which a candidate relay UE becomes a better (or larger) offset than a serving relay UE. In an embodiment of the present application, the offset in the Z2 measurement event is, for example, a first offset. In the Z2 measurement event, the candidate relay UE becoming better than the serving relay UE by the first offset can be understood as the signal quality of the candidate relay UE becoming better than the signal quality of the serving relay UE by the first offset. For example, the measurement configuration information includes a measurement identifier, for example, a measurement ID. The measurement ID may be associated with the measurement report configuration, i.e., with the measurement event. The measurement report configuration is used to configure the conditions for a remote UE to send a measurement report to a network device corresponding to the measurement event and the content of the measurement report. The measurement report configuration is, for example, a report configuration NR (reportConfigNR).

[0117] Optionally, the measurement configuration information may include information about an offset used for a Z2 measurement event. Based on the configured Z2 measurement event, a manner in which a remote UE can compare a measurement result of a serving relay UE with a measurement result of a candidate relay UE (or a manner in which a remote UE measures a serving relay UE and a candidate relay UE) may include at least one of Measurement Scheme 1 to Measurement Scheme 4, and an offset for at least one measurement scheme may be included in the measurement report configuration.

[0118] Measurement method 1 is to measure the SL-RSRP of the serving relay UE and the SL-RSRP of the candidate relay UE.

[0119] Measurement method 2 is to measure the SD-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE.

[0120] Measurement method 3 is to measure the SL-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE.

[0121] Measurement method 4 is to measure the SD-RSRP of the serving relay UE and the SL-RSRP of the candidate relay UE.

[0122] Consider an application scenario. For example, the remote UE uses measurement method 3. Specifically, the remote UE measures the SL-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE. When the distance between the serving relay UE and the remote UE is short, the serving relay UE takes into account the SL path loss between the serving relay UE and the remote UE, so the serving relay UE uses low transmit power when transmitting SL unicast data. As a result, the SL-RSRP value obtained by the remote UE by measuring the SL unicast data from the serving relay UE is small. However, the candidate relay UE may not consider the SL path loss when transmitting discovery messages and may use high transmit power. In this case, the SD-RSRP value obtained by the remote UE by measuring the discovery messages from the candidate relay UE is large. In this case, the SD-RSRP may be larger than the SL-RSRP. Therefore, the remote UE can compare the measured SL-RSRP with the measured SD-RSRP and draw a conclusion that the measurement result satisfies the Z2 measurement event. In this case, the remote UE can send a measurement report to the network device. If the network device makes a decision based on the measurement report, the network device is likely to determine that the remote UE should perform a path switch, for example, to switch from the indirect path between the remote UE and the serving relay UE to the indirect path between the remote UE and the candidate relay UE. However, in this case, the SL channel quality of the serving relay UE may not be poor. Because the serving relay UE takes SL path loss into account when transmitting SL unicast data, the SL-RSRP value measured by the remote UE is small. In other words, the network device may have an inaccurate decision result and determine that the remote UE should perform a path switch when it does not need to.

[0123] Therefore, optionally, the measurement configuration information may be used to separately configure a first offset for at least one measurement scheme. For example, at least one first offset may be configured in total, and the first offset may have a one-to-one correspondence with the measurement scheme, with different measurement schemes corresponding to different first offsets. Optionally, the measurement scheme and the first offset may be configured together by using the measurement configuration information. For example, if a measurement scheme is not configured, the first offset corresponding to the measurement scheme does not need to be configured. At least one first offset corresponding to at least one measurement scheme may be included in the measurement report configuration. If the remote UE uses a measurement scheme, the remote UE may use the first offset corresponding to the measurement scheme. For example, the first offset corresponding to measurement scheme 1 is offset1, the first offset corresponding to measurement scheme 2 is offset2, the first offset corresponding to measurement scheme 3 is offset3, and the first offset corresponding to measurement scheme 4 is offset4. offset1, offset2, offset3, and offset4 are different from each other. FIG. 3A is a diagram illustrating the configuration of offsets 1 to 4 using measurement configuration information. In FIG. 3A, offsets 1 to 4 are denoted as offset 1 to offset 4, respectively. The first offset corresponding to the measurement scheme may be configured based on the measurement type corresponding to the measurement scheme. For example, for measurement scheme 3, if the scenario described in the previous paragraph is considered, offset 3 corresponding to measurement scheme 3 may be large. As a result, it is difficult for the SL channel quality of the candidate relay UE to satisfy the condition that the SL channel quality is higher than offset 3. This reduces the probability that the remote UE will send a measurement report to the network device when the SL channel quality of the serving relay UE is good, thereby facilitating the path switching process of the remote UE.

[0124] Alternatively, the same measurement scheme may correspond to multiple first offsets separately, and the remote UE determines the first offset to be used based on a configured condition. Measurement Scheme 3 is used as an example. The remote UE can determine the first offset to be used among the multiple first offsets based on the SL channel quality of the current serving relay UE or the SL path loss between the serving relay UE and the remote UE. For example, a threshold or a value range is provided, and the remote UE determines the first offset to be used based on whether the threshold condition or the value range condition is met. This solution is applicable to any one of Measurement Schemes 1 to 4. For example, for Measurement Scheme 3, the multiple corresponding first offsets are respectively associated with SL channel quality ranges of the serving relay UE. For example, offset1 in the multiple first offsets corresponds to the SL-RSRP of the relay UE being greater than (greater than) a second threshold. The offset2 in the plurality of first offsets corresponds to the SL-RSRP of the relay UE being less than or equal to a second threshold. After receiving the configuration, the remote UE determines whether to use offset1 or offset2 in a Z2 event based on the SL channel measurement result of the current serving relay UE. In another example, for measurement scheme 3, the plurality of corresponding first offsets are respectively associated with the SL path loss range of the serving relay UE. For example, the offset1 in the plurality of first offsets corresponds to the SL-RSRP of the relay UE being greater than or equal to a third threshold. The offset2 in the plurality of first offsets corresponds to the SL-RSRP of the relay UE being less than or equal to the third threshold. After receiving the configuration, the remote UE determines whether to use offset1 or offset2 in a Z2 event based on the SL path loss result between the remote UE and the current serving relay UE.In this configuration manner, the remote UE can determine the decision conditions for the Z2 measurement event based on the measurement status of the remote UE, so as to provide more accurate results to the network device.

[0125] Alternatively, different measurement schemes may correspond to the same first offset. For example, any multiple of offset1, offset2, offset3, and offset4 may be the same. For example, offset1 may be the same as offset2 but different from both offset3 and offset4, or offset2, offset3, and offset4 may be the same but different from offset1, or offset1, offset2, offset3, and offset4 may all be the same. Optionally, if offset1 to offset4 are all the same, the measurement configuration information may still be used to configure the first offset separately for at least one measurement scheme, but the configured first offset values ​​are all the same. Alternatively, the measurement configuration information may be used to configure one first offset for at least one measurement scheme, and different measurement schemes all correspond to the first offset, thereby reducing the overhead of the measurement configuration information. For example, offset is configured using the measurement configuration information, and offset is applicable to each of measurement schemes 1 to 4. When the measurement configuration information is used to configure one first offset for at least one measurement scheme, the first offset may be configured on the condition that any measurement scheme is configured using the measurement configuration information. Alternatively, when the measurement configuration information is used to configure one first offset for at least one measurement scheme, the measurement configuration information may be used to configure the first offset instead of configuring the measurement scheme. The first offset may be used regardless of the measurement scheme used by the remote UE. Figure 3B is a diagram illustrating configuring one offset using the measurement configuration information. This configuration method may simplify the configuration process and may also simplify the process by which the remote UE determines whether the Z2 measurement event is satisfied.When performing a measurement based on a measurement ID included in the measurement configuration information, the remote UE may perform the measurement based on a measurement target associated with the measurement ID and may evaluate whether to perform reporting based on a measurement event in the measurement reporting configuration included in the measurement configuration information. Optionally, the fact that the measurement configuration information is used to configure a measurement scheme or a first offset corresponding to the measurement scheme cannot be understood as a restriction on the measurement process of the remote UE. For example, the measurement configuration information is used to configure a first offset corresponding to measurement scheme 1 and measurement scheme 2, which does not mean that the remote UE needs to perform measurements in measurement scheme 1 and measurement scheme 2. The measurement scheme used by the remote UE may be determined by the remote UE. For example, the remote UE may determine the measurement scheme based on measurement information currently acquired by the remote UE. However, when a measurement scheme configured by using the measurement configuration information is used, whether the measurement reporting condition is met may be determined based on the configuration (e.g., the first offset) provided by using the measurement configuration information.

[0126] The measurement scheme may be predefined in the protocol. For example, it may be predefined that only the SD-RSRP of the candidate relay UE is allowed to be used. In this case, the measurements performed by the remote UE based on the measurement configuration information may be only Measurement Scheme 2 and / or Measurement Scheme 3. Measurement Scheme 1 and Measurement Scheme 4 are not used to compare the results of measurement events. Alternatively, it may be predefined that only the SD-RSRP of the candidate relay UE is allowed to be used and that comparisons are only performed for measurement results of the same measurement type. This is equivalent to the remote UE being allowed to measure only the SD-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE. In this case, only Measurement Scheme 2 may be used for measurements performed by the remote UE based on the measurement configuration information. Measurement Scheme 1, Measurement Scheme 3, and Measurement Scheme 4 are not used. The measurement results of the SD-RSRP of the serving relay UE are compared with the measurement results of the SD-RSRP of the candidate relay UE. The comparison is fair because neither of the two measurement results is affected by power control caused by SL path loss. When the serving relay UE does not send a discovery message, the remote UE can trigger the serving relay UE to send a discovery message, e.g., send a discovery message to the relay UE in mode b to trigger the relay UE to respond. The remote UE can measure the discovery message to determine which discovery message is from the serving relay UE by performing a comparison between the source layer 2 (L2) ID of the received discovery message or the source user information (User Info) carried in the discovery message and obtain the SD-RSRP of the serving relay UE. Alternatively, it may be predefined in the protocol that the SD-RSRP and SL-RSRP of the candidate relay are allowed to be used.In this case, the measurements performed by the remote UE based on the measurement configuration information may be any one or more of Measurement Scheme 1 to Measurement Scheme 4. Alternatively, it may be further predefined in the protocol that the SD-RSRP and SL-RSRP of the candidate relay are allowed to be used, and comparison is allowed to be performed only on measurement results of the same measurement type. In this case, based on the measurement configuration information, Measurement Scheme 1 and / or Measurement Scheme 2 may be used, but Measurement Scheme 3 and Measurement Scheme 4 are not used. When the SD-RSRP of the serving relay UE or candidate relay UE needs to be measured or is requested to be measured, the remote UE may trigger the relay UE to send a discovery message. The remote UE can determine the discovery message from the serving relay UE or the target candidate relay UE by performing a comparison between the source L2 ID or source User Info carried in the discovery message, and measure the discovery message to obtain the SD-RSRP of the relay UE (serving relay UE or target candidate relay UE).

[0127] Optionally, the measurement configuration information may be further used to configure one or more of the following: whether to report a measurement type corresponding to the measurement result of the measurement event, whether to report SL path loss, a first threshold, a second threshold, or a third threshold.

[0128] The measurement configuration information may be used to configure reporting of a measurement type corresponding to the measurement result of a triggered measurement event. In this case, when sending a measurement report to a network device, the remote UE may also send the measurement type corresponding to the measurement result of the triggered measurement event. Alternatively, the measurement configuration information may be used to configure not to report the measurement type corresponding to the measurement result of a triggered measurement event. In this case, the remote UE may not need to send the measurement type corresponding to the measurement result of the triggered measurement event. The measurement event is a measurement event configured through the measurement report configuration in the measurement configuration information, for example, a Z2 measurement event. For example, the measurement type may include SL-RSRP or SD-RSRP, or may include SL unicast data measurement results or discovery message measurement results. For example, the measurement configuration information may be used to configure one or more of the following: reporting whether the measurement result of the serving relay UE is SL-RSRP, reporting whether the measurement result of the candidate relay UE is SL-RSRP, reporting whether the measurement result of the serving relay UE is SL-RSRP or SD-RSRP, or reporting whether the measurement result of the candidate relay UE is SL-RSRP or SD-RSRP.

[0129] Optionally, if the protocol predefines that only the SD-RSRP of the candidate relay UE is allowed to be used and that comparison is only allowed for measurement results of the same measurement type, or if the measurement configuration information is used to configure measurement method 2 but not measurement method 1, measurement method 3, and measurement method 4, it indicates that the remote UE does not need to measure SL-RSRP and only needs to measure SD-RSRP for comparison. In this case, the measurement configuration information does not need to be used to configure reporting of the measurement type corresponding to the measurement result of the triggered measurement event, or may be used to configure not to report the measurement type corresponding to the measurement result of the triggered measurement event. Alternatively, the measurement configuration information may not be used to configure whether to report the measurement type corresponding to the measurement result of the triggered measurement event. For example, a parameter indicating whether to report the measurement type corresponding to the measurement result of the triggered measurement event is not configured, and the remote UE does not need to transmit the measurement type corresponding to the measurement result.

[0130] When the measurement scheme configured by using the measurement configuration information includes measuring SL-RSRP (SL-RSRP of the serving relay UE and / or SL-RSRP of the candidate relay UE), for example, when the measurement configuration information is used to configure one or more of Measurement Scheme 1, Measurement Scheme 3, or Measurement Scheme 4, the measurement configuration information may be used to configure whether to report a measurement type corresponding to a measurement result of a triggered measurement event. Alternatively, even when the measurement configuration information is used to configure one or more of Measurement Scheme 1, Measurement Scheme 3, or Measurement Scheme 4, the measurement configuration information may not be used to configure whether to report a measurement type corresponding to a measurement result of a triggered measurement event, for example, may not be used to configure a parameter indicating whether to report a measurement type corresponding to a measurement result of a measurement event.

[0131] The measurement configuration information may be used to configure whether to report SL path loss or not to report SL path loss. The SL path loss may include the SL path loss between the remote UE and the serving relay UE and / or the SL path loss between the remote UE and the candidate relay UE. For example, the measurement configuration information may be used to configure whether to report SL path loss through a parameter. If the parameter indicates to report SL path loss, the remote UE may transmit the SL path loss between the remote UE and the serving relay UE and / or the SL path loss between the remote UE and the candidate relay UE to the network device. In another example, the measurement configuration information may be used to configure whether to report SL path loss between the remote UE and the serving relay UE through parameter 1 and whether to report SL path loss between the remote UE and the candidate relay UE through parameter 2. In this case, the network device may separately configure whether to report the two types of SL path loss. Alternatively, the remote UE may separately perform corresponding operations based on different configured parameters, and the operations of whether to report different SL path losses do not interfere with each other.

[0132] For example, if the measurement scheme that can be used based on the measurement configuration information is related to SL-RSRP measurements, e.g., if the measurement scheme used for comparison in the Z2 measurement event includes any one or more of Measurement Scheme 1, Measurement Scheme 3, or Measurement Scheme 4, the measurement configuration information can be used to configure reporting of SL path loss. If the measurement scheme that can be used based on the measurement configuration information is not related to SL-RSRP measurements, e.g., if the measurement scheme used for comparison in the Z2 measurement event is Measurement Scheme 2, the measurement configuration information can be used to configure not to report SL path loss. Furthermore, the measurement configuration information is used to configure whether to report SL path loss between the remote UE and the serving relay UE via parameter 1, and is used to configure whether to report SL path loss between the remote UE and the serving relay UE via parameter 2, and if the measurement scheme that can be used based on the measurement configuration information relates to SL-RSRP measurement of the serving relay UE, the measurement configuration information can be used to configure reporting SL path loss between the remote UE and the serving relay UE via parameter 1, and / or if the measurement scheme that can be used based on the measurement configuration information relates to SL-RSRP measurement of the candidate relay UE, the measurement configuration information can be used to configure reporting SL path loss between the remote UE and the serving relay UE via parameter 2.

[0133] The first threshold may be used by the remote UE to determine the SL path loss indicated by the measurement report. For example, an optional manner in which the remote UE transmits the SL path loss is for the remote UE to transmit a specific value of the SL path loss. Alternatively, another optional manner in which the remote UE transmits the SL path loss is for the remote UE to transmit second indication information, where the second indication information may indicate a range to which the SL path loss belongs or whether the value of the SL path loss is greater than (or equal to) the first threshold. For example, the remote UE may determine a specific value of the SL path loss, further determine a range to which the SL path loss belongs, and indicate the range via the second indication information without needing to indicate a specific value of the SL path loss. Alternatively, the remote UE can determine a specific value of the SL path loss, and then further determine whether the SL path loss is greater than a first threshold (or whether the SL path loss is equal to or greater than the first threshold), and indicate whether the SL path loss is greater than the first threshold (or whether the SL path loss is equal to or greater than the first threshold) via the second indication information. This part will be further described below.

[0134] The second threshold may be a threshold corresponding to a measurement result, such as an RSRP threshold. For example, the second threshold is a threshold configured for a measurement result of a serving relay UE of the remote UE. Based on the second threshold, the remote UE can determine whether to send a measurement report, whether to trigger a report of a configured measurement event (e.g., a Z2 measurement event), whether to measure candidate relay UEs, or whether to trigger an offset used in a configured measurement event. For example, if a measurement result obtained by the remote UE for the serving relay UE is less than (or equal to or less than) the second threshold and the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using the measurement configuration information, the remote UE may transmit a measurement report, or if a measurement result obtained by the remote UE for the serving relay UE is greater than (or equal to or greater than) the second threshold, the remote UE may not transmit a measurement report regardless of whether the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using the measurement configuration information. In another example, the second threshold is a condition for a measurement event. If the measurement result obtained by the remote UE for the serving relay UE is less than (or equal to or less than) the second threshold and the measurement result satisfies a measurement event configured by using the measurement configuration information (e.g., a Z2 measurement event), the remote UE may send a measurement report; or if the measurement result obtained by the remote UE for the serving relay UE is greater than or equal to (or greater than) the second threshold, the remote UE may not trigger a measurement report, i.e., does not send a measurement report due to the measurement event, regardless of whether the measurement result satisfies a measurement event configured by using the measurement configuration information (e.g., a Z2 measurement event).In another example, if the measurement result acquired by the remote UE for the serving relay UE is less than (or less than or equal to) the second threshold, the remote UE may measure the candidate relay UE of the remote UE to determine whether the measurement event (e.g., Z2 measurement event) configured by using the measurement configuration information is satisfied; or if the measurement result acquired by the remote UE for the serving relay UE is greater than (or equal to) the second threshold, the remote UE may not measure the candidate relay UE even if a measurement is configured to be performed on the candidate relay UE, and therefore does not trigger a measurement report. In another example, the measurement event configuration received by the remote UE includes at least one first offset (e.g., offset1 and offset2). If the measurement result acquired by the remote UE for the serving relay UE is less than (or less than or equal to) the second threshold, it is determined that offset1 is to be used as the offset condition for the configured measurement event measurement (e.g., Z2 measurement event). If the measurement result obtained by the remote UE for the serving relay UE is greater than (or equal to or greater than) the second threshold, it is determined that offset2 is used as the offset condition for the configured measurement event measurement (e.g., Z2 measurement event). When the measurement result satisfies the measurement event, the remote UE may send a measurement report, or when the measurement result does not satisfy the measurement event, the remote UE may not send a measurement report.

[0135] The third threshold may be a threshold corresponding to SL path loss. For example, the third threshold is a threshold configured for SL path loss between the remote UE and the serving relay UE. Based on the third threshold, the remote UE can determine whether to send a measurement report, whether to trigger a report of a configured measurement event (e.g., a Z2 measurement event), whether to measure a candidate relay UE, or whether to trigger an offset used in a configured measurement event. For example, if the SL path loss between the remote UE and the serving relay UE is greater than (or equal to or greater than) the third threshold and the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using measurement configuration information, the remote UE can send a measurement report. Alternatively, if the SL path loss between the remote UE and the serving relay UE is less than (or less than) the third threshold, the remote UE may not send a measurement report, regardless of whether the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using measurement configuration information. In another example, if the SL path loss between the remote UE and the serving relay UE is greater than (or equal to or greater than) the third threshold and the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using measurement configuration information, the remote UE may send a measurement report. Alternatively, if the SL path loss between the remote UE and the serving relay UE is less than (or equal to) the third threshold, the remote UE may not trigger a measurement report, i.e., not send a measurement report due to a measurement event, regardless of whether the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using measurement configuration information. Alternatively, when the SL path loss between the remote UE and the serving relay UE is less than (or equal to) the third threshold, the configured measurement event (e.g., a Z2 measurement event) may always be considered not to be satisfied.Therefore, a measurement report is not triggered due to the measurement event. In another example, if the SL path loss between the remote UE and the serving relay UE is less than (or less than or equal to) the third threshold, the remote UE may measure its candidate relay UEs to determine whether a configured measurement event (e.g., a Z2 measurement event) is satisfied by using the measurement configuration information. Alternatively, if the SL path loss between the remote UE and the serving relay UE is greater than (or equal to) the third threshold, the remote UE may not measure the candidate relay UEs and thus not trigger a measurement report. In another example, the measurement event configuration received by the remote UE includes at least one first offset (e.g., offset1 and offset2). If the SL path loss between the remote UE and the serving relay UE is less than (or less than or equal to) the third threshold, it is determined that offset1 is used as the offset condition for the configured measurement event measurement (e.g., a Z2 measurement event). If the SL path loss between the remote UE and the serving relay UE is greater than (or equal to or greater than) the third threshold, it is determined that offset2 is used as the offset condition for the configured measurement event measurement (e.g., Z2 measurement event). When the measurement result acquired by the remote UE satisfies the measurement event, the remote UE may send a measurement report, or when the measurement result acquired by the remote UE does not satisfy the measurement event, the remote UE may not send a measurement report.

[0136] The measurement configuration information may be used to configure the second threshold and / or the third threshold. When both the second threshold and the third threshold are configured, the two thresholds may be used in combination. For example, if the SL path loss between the remote UE and the serving relay UE is greater than (or equal to or greater than) the third threshold, the measurement result obtained by the remote UE for the serving relay UE is less than (or equal to or less than) the second threshold, and the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using the measurement configuration information, the remote UE can send a measurement report. Alternatively, if the SL path loss between the remote UE and the serving relay UE is less than or equal to the third threshold (or less than the third threshold) and / or the measurement result obtained by the remote UE for the serving relay UE is greater than the second threshold (or greater than or equal to the second threshold), the remote UE may not send a measurement report, regardless of whether the measurement result satisfies a measurement event (e.g., a Z2 measurement event) configured by using the measurement configuration information. In another example, if the SL path loss between the remote UE and the serving relay UE is greater than the third threshold (or greater than or equal to the third threshold) and the measurement result obtained by the remote UE for the serving relay UE is less than the second threshold (or less than or equal to the second threshold), the remote UE may measure its candidate relay UEs to determine whether a measurement event (e.g., a Z2 measurement event) configured by using the measurement configuration information is satisfied. Alternatively, if the SL path loss between the remote UE and the serving relay UE is less than or equal to the third threshold (or less than the third threshold), and / or the measurement result obtained by the remote UE for the serving relay UE is greater than or equal to the second threshold (or greater than or equal to the second threshold), the remote UE may not measure the candidate relay UE and therefore will not trigger a measurement report.

[0137] By using the second threshold and / or the third threshold, the process of the remote UE reporting the measurement report can be reduced, thereby reducing unnecessary path switching processes performed by the remote UE. For example, if the measurement result of the serving relay UE is greater than (or equal to or greater than) the second threshold, it indicates that the SL channel quality of the serving relay UE is good. In this case, the remote UE may not perform a path switch. Therefore, the remote UE may not send a measurement report, and the network device does not determine whether the remote UE should perform a path switch. In another example, if the measurement result of the serving relay UE is greater than (or equal to or greater than) the second threshold, it indicates that the SL channel quality of the serving relay UE is good. In this case, the remote UE may not perform a path switch. Therefore, the first offset associated with the configured measurement event (e.g., Z2 measurement event) in this case is large. In this way, the remote UE determines that a large offset is used and the measurement event is not easily satisfied. Therefore, the remote UE may not send a measurement report, and the network device does not determine whether the remote UE should perform a path switch. In another example, if the SL path loss between the remote UE and the serving relay UE is smaller than (or equal to) a third threshold, it indicates that the distance between the serving relay UE and the remote UE is short. Because the distance is short, the SL channel quality of the serving relay UE may also be good. Therefore, the remote UE may not need to perform a path switch. In this case, the remote UE may not send a measurement report, and the network device does not determine whether the remote UE should perform a path switch. In another example, if the SL path loss between the remote UE and the serving relay UE is smaller than (or equal to) a third threshold, it indicates that the SL channel quality of the serving relay UE is good.In this case, the remote UE may not need to perform a path switch. Therefore, the first offset associated with the configured measurement event (e.g., the Z2 measurement event) in this case is large. In this way, the remote UE determines that a large offset is used and the measurement event is not easily satisfied. Therefore, the remote UE may not send a measurement report, and the network device does not determine whether the remote UE should perform a path switch.

[0138] Alternatively, one or more of the first threshold, the second threshold, or the third threshold may not be configured by using measurement configuration information, but may, for example, be predefined in the protocol, or preconfigured in the UE, or configured by a higher layer of the UE (e.g., a radio resource control (RRC) layer).

[0139] Optionally, the method further includes S202: the remote UE sending a measurement report to the network device. Correspondingly, the network device receives the measurement report from the remote UE. For example, the remote UE may send the measurement report to the network device via a first relay UE. The measurement report may include a first measurement result. The first measurement result is a result obtained by the remote UE by performing a measurement based on measurement configuration information from the network device, or the first measurement result is a result obtained by the remote UE by performing a measurement based on a measurement event configured by using the measurement configuration information from the network device. In another example, in the architecture of FIG. 1B, the remote UE may directly send the measurement report to the network device.

[0140] The remote UE may perform measurements based on the measurement configuration information. If neither the second threshold nor the third threshold is configured by using the measurement configuration information (or the second threshold and / or the third threshold are not defined in the protocol), the remote UE may send a measurement report to the network device when a measurement result satisfies a measurement event configured by using the measurement configuration information. Alternatively, if the second threshold and / or the third threshold are configured by using the measurement configuration information (or the second threshold and / or the third threshold are predefined in the protocol), the remote UE may send a measurement report to the network device when the second threshold and / or the third threshold are met and the measurement result satisfies a measurement event configured by using the measurement configuration information. Alternatively, if the second threshold and / or the third threshold are configured by using the measurement configuration information (or the second threshold and / or the third threshold are predefined in the protocol), an offset parameter of the measurement event may be determined based on the second threshold and / or the third threshold to determine the measurement event. The method for satisfying the second and third thresholds is described in S201.

[0141] Optionally, the measurement report may further include first indication information, where the first indication information may indicate a measurement type corresponding to the first measurement result. The first indication information may or may not be included in the first measurement result. As described in S201, the network device can configure whether to report a measurement type corresponding to a measurement result of a measurement event by using measurement configuration information. If the measurement configuration information is used to configure reporting a measurement type corresponding to a measurement result of a triggered measurement event, the measurement report may include the first indication information. If the measurement configuration information is used to configure not to report a measurement type corresponding to a measurement result of a triggered measurement event, the measurement report may not include the first indication information. Alternatively, the measurement configuration information may not be used to configure whether to report a measurement type corresponding to a measurement result of a measurement event. For example, the measurement configuration information does not include a parameter used to configure whether to report a measurement type corresponding to a measurement result of a triggered measurement event. In this case, the remote UE may transmit the first indication information. For example, the measurement report includes the first indication information. Alternatively, the remote UE may not send the first indication information in this case. For example, the measurement report does not include the first indication information. Alternatively, if the measurement configuration information includes the first threshold, the second threshold, and / or the third threshold, the measurement report may include the first indication information when reporting is performed after the threshold is met.

[0142] The first indication information indicates a measurement type corresponding to the first measurement result, or the first indication information indicates a measurement type corresponding to the first measurement result used in the triggered measurement event. Optionally, the measurement type corresponding to the first measurement result may include one or more of the following: the measurement result of the first relay UE is SL-RSRP, the measurement result of the first relay UE is SD-RSRP, the measurement result of the second relay UE is SL-RSRP, the measurement result of the second relay UE is SD-RSRP, whether the measurement result of the first relay UE is SL-RSRP, or whether the measurement result of the second relay UE is SL-RSRP. The first relay UE is a serving relay UE for the remote UE, and the second relay UE is a candidate relay UE for the remote UE. There may be multiple candidate relay UEs for the remote UE. In this case, the first indication information may indicate the measurement types of the measurement results of these candidate relay UEs. In this specification, the second relay UE is used as an example, and the second relay UE is, for example, any one of the candidate relay UEs.

[0143] For example, it is predefined in the protocol that SD-RSRP and SL-RSRP of the candidate relay are allowed to be used. Based on the measurement configuration information, any one or more of measurement schemes 1 to 4 may be used to determine whether the configured measurement event is met. For example, the four measurement schemes mentioned above may be used based on the measurement configuration information. Comparisons may be performed for multiple types of quantities, and the configuration is flexible, so that the remote UE can more easily obtain measurement results. Alternatively, it is predefined in the protocol that SD-RSRP and SL-RSRP of the candidate relay are allowed to be used, and comparisons may be performed only for measurement results of the same measurement type. Based on the measurement configuration information, measurement scheme 1 and / or measurement scheme 2 may be used for comparison in the configured measurement event, but measurement schemes 3 and 4 may not be used. Comparisons are performed between measurement results of the same type of serving relay UE and candidate relay UE. The comparison is fair because either neither of the two measurement results is affected by power control caused by SL path loss, or both measurement results are affected by power control caused by SL path loss. When the serving relay UE or the candidate relay UE does not send a discovery message but the SD-RSRP needs to be measured, the remote UE may trigger the relay UE to send a discovery message, for example, in mode b, to trigger the relay UE to respond. The remote UE can determine the discovery message from the relay UE (serving relay UE or candidate relay UE) by performing a comparison between the source L2 ID or source User Info carried in the discovery message, and measure the discovery message to obtain the SD-RSRP of the relay UE (serving relay UE or candidate relay UE). The measurement configuration information is used to configure whether to report the measurement type corresponding to the measurement result of the triggered measurement event.After the trigger, the remote UE reports a measurement type corresponding to the measurement result of the triggered measurement event. For example, in a reporting manner, the measurement configuration information is used to configure whether the measurement result of the serving relay UE is SL-RSRP and / or whether the measurement result of the candidate relay UE is SL-RSRP. In this case, the first indication information may indicate whether the measurement result of the first relay UE is SL-RSRP and / or whether the measurement result of the second relay UE is SL-RSRP. In another example, the measurement configuration information is used to configure whether the measurement type corresponding to the measurement result of the triggered measurement event is reported. In another configuration manner, the measurement configuration information is used to configure whether the measurement result of the serving relay UE is SL-RSRP or SD-RSRP and / or whether the measurement result of the candidate relay UE is SL-RSRP or SD-RSRP. In this case, the first indication information may indicate one or more of the following: the measurement result of the first relay UE is SL-RSRP, the measurement result of the first relay UE is SD-RSRP, the measurement result of the second relay UE is SL-RSRP, or the measurement result of the second relay UE is SD-RSRP. In another example, if comparison is allowed to be performed only for measurement results of the same measurement type, the remote UE may report whether the measurement scheme used is SL-RSRP or SD-RSRP. Specifically, the first indication information may indicate whether the type of measurement result used in the currently triggered measurement event is SL-RSRP or SD-RSRP. Since comparison is allowed to be performed only for results of the same measurement type, the measurement type reported by the remote UE may be that of the serving relay UE or that of the candidate relay UE.

[0144] Alternatively, it is predefined in the protocol that only SD-RSRP of the candidate relay UE is allowed to be used. Based on the measurement configuration information, measurement method 2 and / or measurement method 3 may be used to trigger a measurement event, instead of measurement method 1 and measurement method 4. The measurement configuration information is used to configure whether to report a measurement type corresponding to the measurement result of the measurement event. For example, in the reporting method, the measurement configuration information is used to configure whether to report the measurement result of the serving relay UE is SL-RSRP. In this case, the first indication information may indicate whether the measurement result of the first relay UE is SL-RSRP. In another example, the measurement is used to configure whether to report a measurement type corresponding to the measurement result of the measurement event. In another configuration method, the measurement configuration information is used to configure whether to report the measurement result of the serving relay UE is SL-RSRP or SD-RSRP. In this case, the first indication information may indicate that the measurement result of the first relay UE is SL-RSRP or SD-RSRP.

[0145] However, if it is predefined in the protocol based on the measurement configuration information that only the SD-RSRP of the candidate relay UE is allowed to be used and that comparison is only allowed for measurement results of the same measurement type, then measurement method 2 may be used, but measurement method 1, measurement method 3, and measurement method 4 are not used. In this case, the measurement configuration information may be used to configure not to report the measurement type corresponding to the measurement result of the measurement event, or the measurement configuration information may not be used to configure whether to report the measurement type corresponding to the measurement result of the measurement event. When the configured measurement event triggers a measurement report, the network device may learn that the SD-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE are used for comparison and a report is triggered.

[0146] Optionally, the measurement report may indicate a first path loss and / or a second path loss. The first path loss is the SL path loss between the remote UE and the first relay UE, and the second path loss is the SL path loss between the remote UE and the second relay UE. For example, if the measurement configuration information is used to configure reporting SL path loss, the measurement report may indicate the first path loss if the first measurement result relates to the SL-RSRP of the serving relay UE, and the measurement report may indicate the second path loss if the first measurement result relates to the SL-RSRP of the candidate relay UE. In another example, if the measurement configuration information is used to configure reporting SL path loss between the remote UE and the serving relay UE via parameter 1, the measurement report may indicate the first path loss, and if the measurement configuration information is used to configure reporting SL path loss between the remote UE and the serving relay UE via parameter 2, the measurement report may indicate the second path loss. In yet another example, the measurement configuration information is not used to configure whether to report SL path loss. For example, the measurement configuration information does not include a parameter indicating whether to report SL path loss. Optionally, if the first measurement result is related to SL-RSRP, the remote UE may alternatively report SL path loss itself.

[0147] The measurement report indicates the first path loss and / or the second path loss. For example, in an indication manner, the measurement report may further indicate the first path loss and / or the second path loss. This is understood as meaning that in addition to including the first measurement result, the measurement report may further indicate the first path loss and / or the second path loss. In other words, the first measurement result does not indicate the first path loss and / or the second path loss. Alternatively, another manner in which the measurement report indicates the first path loss and / or the second path loss is that the first measurement result indicates the first path loss and / or the second path loss.

[0148] The measurement report or the first measurement result indicates the first path loss, for example, in an indication manner, the measurement report or the first measurement result includes a value of the first path loss.

[0149] Alternatively, another indication manner for indicating the first path loss by the measurement report or the first measurement result is that the measurement report or the first measurement result includes second indication information, which may indicate a range to which the first path loss value belongs or whether the first path loss value is greater than a first threshold. The range to which the path loss value belongs may be predefined in the protocol or configured by using the measurement configuration information in S201. For example, if the first path loss is smaller than (or less than) a first value, the range to which the first path loss belongs is "small." If the first path loss is larger than (or greater than) the first value and smaller than (or less than) a second value, the range to which the first path loss belongs is "medium." If the first path loss is larger than (or greater than) the second value, the range to which the first path loss belongs is "large." For example, the first value is 10 dB and the second value is 30 dB. In the above example, the same decision threshold is used for the different ranges. For example, a first value is used as both the upper limit of the "small" range and the lower limit of the "medium" range. Alternatively, different decision thresholds may be used for the different ranges. For example, if the first path loss is smaller than (or less than) the first value, the range to which the first path loss belongs is "small." If the first path loss is larger than (or greater than) the second value and smaller than (or less than) the third value, the range to which the first path loss belongs is "medium." If the first path loss is larger than (or greater than) the fourth value, the range to which the first path loss belongs is "large." The first value may be different from the second value, and / or the third value may be different from the fourth value.

[0150] In another example, if the first path loss is smaller than (or smaller than) a third value, the range to which the first path loss belongs is "near," and if the first path loss is larger than (or equal to) the third value, the range to which the first path loss belongs is "far." The third value is, for example, 20 dB. Similarly, in the above example, the same decision threshold is used for different ranges. For example, the third value is used as both the upper limit of the "near" range and the lower limit of the "far" range. Alternatively, different decision thresholds may be used for different ranges. In another example, if the first path loss is smaller than (or smaller than) a third value, the range to which the first path loss belongs is "near," and if the first path loss is larger than (or equal to) a fourth value, the range to which the first path loss belongs is "far." The third value may be different from the fourth value.

[0151] In another example, if the first path loss is equal to or less than the first threshold, the second indication may indicate that the first path loss is not greater than the first threshold, and if the first path loss is greater than the second threshold, the second indication may indicate that the first path loss is greater than the second threshold. The first threshold may be the same as or different from the second threshold. For example, the second indication occupies one bit. If the bit value is "0", it indicates that the first path loss is not greater than the first threshold. If the bit value is "1", it indicates that the first path loss is greater than the second threshold.

[0152] In another example, the second indication information only indicates that the first path loss is greater than (or equal to) a threshold (e.g., a first threshold). Specifically, when the measurement report includes the second indication information, it indicates that the first path loss is greater than (or equal to) the first threshold. The measurement report includes the second indication information only when the threshold condition is met. When the threshold condition is not met, the measurement report does not include the second indication information.

[0153] The manner in which the second path loss is indicated by the measurement report or the first measurement result is the same as the manner in which the first path loss is indicated. Details will not be described. The manner in which the first path loss is indicated by the measurement report or the first measurement result may be the same as the manner in which the second path loss is indicated. For example, a specific value is included in both. Alternatively, the two indication manners may be different. For example, the measurement report or the first measurement result may include a first path loss value and second indication information, and the second indication information may indicate a range to which the second path loss value belongs.

[0154] If the measurement report indicates an SL path loss, the remote UE can first obtain the SL path loss. The remote UE obtains the first path loss by calculating the first path loss. For example, the remote UE may transmit an SL signal to a first relay UE and instruct the first relay UE to return a measurement result of the SL signal to the remote UE. After receiving the measurement result, the remote UE can obtain the first path loss based on the transmission power of the SL signal and the measurement result. For example, the first path loss is the difference between the transmission power of the SL signal and the measurement result.

[0155] Alternatively, another manner in which the remote UE obtains the first path loss is for the remote UE to receive the first path loss from the first relay UE. For example, the first relay UE may transmit first information to the remote UE. See S203. The first information may indicate whether the first relay UE should perform SL power control based on the SL path loss and / or indicate the first path loss. When transmitting the first information to the remote UE, the first relay UE may have performed SL power control based on the SL path loss, or may not have performed SL power control based on the SL path loss and, if transmitting SL unicast data, may have performed SL power control based on the SL path loss, or may have performed SL power control based on the SL path loss. Optionally, see S204. The remote UE may first transmit first request information to the first relay UE. The first information may be transmitted in response to the first request information. Alternatively, the first information may be transmitted periodically. Alternatively, the first information may be transmitted when the SL power control status of the first relay UE changes. For example, if the distance between the first relay UE and the remote UE gradually increases, the transmission power of the SL unicast data may become high even if the first relay UE performs SL power control on the transmission power of the SL unicast data based on the SL path loss. In this case, the SL-RSRP of the first relay UE measured by the remote UE may match the measured SD-RSRP of the second relay UE. From Equation 1, it can be seen that in this case, the SL path loss is no longer the reason for limiting the transmission power of the SL unicast data. In this case, the first relay UE may transmit the first information to the remote UE.

[0156] The first request information may be used to inquire about SL power control information of the first relay UE (e.g., inquire about whether the first relay UE should perform SL power control based on SL path loss, or inquire about whether the SL path loss of the first relay UE affects the transmit power of SL unicast data), or to inquire about the SL path loss of the first relay UE. The SL path loss of the first relay UE is the SL path loss between the first relay UE and the remote UE. After receiving the first request information, the first relay UE may transmit first information to the remote UE. The first information may indicate whether the first relay UE should perform SL power control based on SL path loss, or may indicate the first path loss. For example, if the first request information is used to inquire about SL power control information of the first relay UE, the first information may indicate to the first relay UE to perform SL power control based on SL path loss, or not to perform SL power control based on SL path loss. Alternatively, when the first request information is used to inquire about the SL path loss of the first relay UE, the first information may indicate the first path loss. The manner of indicating the first path loss by the first information may be the same as the manner of indicating the first path loss by the measurement report or the first measurement result described above. Details will not be described.

[0157] The manner in which the remote UE obtains the second path loss may be similar to the manner in which the remote UE obtains the first path loss, and details will not be described.

[0158] For example, if the first measurement result indicates that the SL channel quality of the first relay UE is a first offset higher than the SL channel quality of the second relay UE, the measurement report further includes first indication information, indicating that the SL-RSRP of the first relay UE is measured and the SD-RSRP of the second relay UE is measured. In this case, optionally, the network device may instruct the remote UE to report the measurement result of the first relay UE. After receiving the measurement result of the first relay UE, the network device may determine whether the remote UE should perform a path switch. For example, if the measurement result of the first relay UE is greater than (or equal to) a fourth threshold, it indicates that the SL channel quality between the first relay UE and the remote UE is good. In this case, the network device may determine that the remote UE should not perform a path switch. If the measurement result of the first relay UE is less than or equal to (or less than) the fourth threshold, the network device may determine that the remote UE performs a path switch.

[0159] In another example, if the first measurement result indicates that the SL channel quality of the first relay UE is a first offset higher than the SL channel quality of the second relay UE, the measurement report includes first indication information indicating that the SL-RSRP of the first relay UE is measured and the SD-RSRP of the second relay UE is measured, and the measurement report further indicates a first path loss. In this case, the determination result of the network device may be that if the first path loss is less than (or equal to or less than) a fifth threshold, the distance between the first relay UE and the remote UE is short. In this case, the SL channel quality between the first relay UE and the remote UE may be good, and the network device may determine that the remote UE should not perform a path switch. If the first path loss is equal to or greater than (or equal to) the fifth threshold, it indicates that the distance between the first relay UE and the remote UE is long, and the network device may determine that the remote UE should perform a path switch.

[0160] Alternatively, when the remote UE determines whether to perform a path switch or a relay UE reselection, step S202 may not be executed. For example, in this case, the method may further include step S205. The remote UE determines whether to perform a path switch or a relay UE reselection based on the first measurement result.

[0161] In this case, information such as measurement configuration information and thresholds (e.g., one or more of the first threshold, the second threshold, or the third threshold) may be pre-configured or distributed by a network device. If the measurement configuration information is determined through pre-configuration, the method may not include S201. The remote UE may perform measurements and measurement comparisons based on the configured information, but does not need to report measurement reports to the network. Instead, the remote UE makes a decision by itself to determine whether to perform relay UE reselection. Optionally, in this case, the measurement configuration information may not include a measurement identifier or measurement report configuration, but may include, for example, a first offset, and optionally may include a measurement scheme (or a correspondence between the measurement scheme and the first offset) and / or thresholds (e.g., one or more of the first threshold, the second threshold, or the third threshold).

[0162] In this embodiment of the present application, when the network device determines whether the remote UE should perform path switching or relay UE reselection, the network device can know the specific status on the current SL through the report by the remote UE, so that the network device can obtain more information to determine whether the remote UE should perform path switching or relay UE reselection, which reduces the probability that the network device inappropriately or erroneously determines whether the remote UE should perform path switching or relay UE reselection.

[0163] When the remote UE determines whether to perform path switching or relay UE reselection, the remote UE is clear about the correspondence between the first offset and the measurement manner, and can therefore determine the measurement type corresponding to the first offset, so that the decision result obtained by the remote UE on whether to perform path switching or relay UE reselection may be more accurate. Optionally, the remote UE can further determine a corresponding threshold, so that the remote UE can decide whether to perform path switching or relay UE reselection when it is more appropriate. This further improves the decision accuracy of the remote UE.

[0164] A second communication method according to an embodiment of the present application is described below. Figure 4 is a flowchart of the method. The method may be applied to the network architectures shown in Figures 1A and 1B. For example, the remote UE in the method may be the remote UE in Figure 1A or 1B, the first relay UE in the method may be the serving relay UE in Figure 1A or 1B, the second relay UE in the method may be the candidate relay UE 1 or candidate relay 2 in Figure 1A or 1B, and the network device in the method may be the network device 1 in Figure 1A or 1B.

[0165] S401: A network device transmits measurement configuration information. Correspondingly, a remote UE (represented as a remote UE in FIG. 4) receives the measurement configuration information from the network device. For example, in the architecture of FIG. 1A, the network device may transmit the measurement configuration information to the remote UE through a serving relay UE of the remote UE (e.g., a first relay UE represented as a first relay UE in FIG. 4). Alternatively, in the architecture of FIG. 1B, the network device may transmit the measurement configuration information directly to the remote UE. Optionally, the network device may transmit the measurement configuration information to the remote UE through an RRC message, or may transmit the measurement configuration information to the remote UE through a system message.

[0166] The measurement configuration information includes a measurement reporting configuration, and the measurement reporting configuration may include a measurement event. Optionally, the measurement configuration information may include one or more measurement reporting configurations, and one measurement reporting configuration may include one measurement event. In other words, the measurement configuration information may include one or more measurement events. Measurement events included in different measurement reporting configurations may all be Z2 measurement events, but the measurement types associated with the measurement events included in the different measurement reporting configurations may be different. Once the measurement event is determined, the measurement type can also be determined. For Z2 measurement events, see the description of the embodiment shown in FIG. 2. For example, the measurement configuration information includes multiple measurement identifiers, such as measurement IDs. The measurement identifiers have a one-to-one correspondence with the measurement reporting configurations (or measurement events). One measurement identifier may be associated with one measurement reporting configuration, or in other words, one measurement event. Optionally, the measurement identifiers, measurement events, and measurement reporting configurations may have a one-to-one correspondence with each other. One measurement identifier may be associated with one measurement event and one measurement reporting configuration. The measurement report configuration is used by the remote UE to send a measurement report corresponding to a measurement event to the network device. The measurement report configuration is, for example, reportConfigNR.

[0167] In this embodiment of the present application, it is equivalent to different measurement events being associated with different measurement types. When sending a measurement report to a network device, the remote UE may indicate the measurement event corresponding to the measurement report (e.g., the measurement report may include a measurement identifier corresponding to the measurement event). After receiving the measurement report from the remote UE, the network device may be clear about the measurement type corresponding to the measurement result. For example, the network device may be clear about whether the SL-RSRP or SD-RSRP of the serving relay UE and the SL-RSRP or SD-RSRP of the candidate relay UE are used in the measurement result obtained by the UE. Therefore, the remote UE does not need to further indicate the measurement type corresponding to the measurement result to the network device. This helps reduce transmission overhead.

[0168] Alternatively, the measurement configuration information may not include the measurement report configuration, but may include only the measurement identifier. For example, the correspondence between the measurement identifier and the measurement event (or the correspondence between the measurement identifier, the measurement report configuration, and the measurement event) may be preconfigured in the network device and the remote UE, or preconfigured by the network device for the remote UE (e.g., the network device sends the correspondence to the remote UE through a separate message), or may be predefined in a protocol. In this case, the network device only needs to send the measurement identifier through the measurement configuration information, and the remote UE can determine one or more specific measurement events configured by the network device based on the measurement identifier. When sending a measurement report to the network device, the remote UE may include a measurement identifier corresponding to the measurement report in the measurement report. In this case, after receiving the measurement report from the remote UE, the network device may be clear about the measurement event corresponding to the measurement result or about the measurement type based on the measurement identifier. For example, the network device may be clear about whether the remote UE acquires the measurement result by using the SL-RSRP or SD-RSRP of the serving relay UE and the SL-RSRP or SD-RSRP of the candidate relay UE. Similarly, in this configuration method, the remote UE does not need to additionally indicate the measurement type corresponding to the measurement result to the network device, and the measurement configuration information does not need to include excessive content, thereby significantly reducing the transmission overhead.

[0169] An example in which the measurement configuration information includes a measurement reporting configuration is used below in this embodiment of the present application.

[0170] Optionally, the measurement events configured by using the measurement configuration information may include any one or more of measurement event 1 to measurement event 4.

[0171] Measurement event 1 is the event where the SL-RSRP of the candidate relay UE is better than the SL-RSRP of the serving relay UE by a first offset.

[0172] Measurement event 2 is the event where the SD-RSRP of the candidate relay UE is better than the SD-RSRP of the serving relay UE by a second offset.

[0173] Measurement event 3 is the event where the SL-RSRP of the candidate relay UE is better than the SD-RSRP of the serving relay UE by a third offset.

[0174] Measurement event 4 is the event where the SD-RSRP of the candidate relay UE is better than the SL-RSRP of the serving relay UE by a fourth offset.

[0175] Optionally, the measurement configuration information may configure offsets for one or more measurement events, respectively. For example, a total of one or more offsets may be configured. The offsets correspond one-to-one to the measurement events, and different measurement events may correspond to different offsets. The measurement events and offsets may be configured together. For example, if a measurement event is not configured, the offset corresponding to the measurement event does not need to be configured. The offset corresponding to the measurement event may be included in the measurement report configuration for the measurement event. When the remote UE performs a measurement event, the remote UE may use the offset corresponding to the measurement event. For example, the first offset corresponding to measurement event 1 is offset1, and both measurement event 1 and offset1 are included in measurement report configuration 1; the second offset corresponding to measurement event 2 is offset2, and both measurement event 2 and offset2 are included in measurement report configuration 2; the third offset corresponding to measurement event 3 is offset3, and both measurement event 3 and offset3 are included in measurement report configuration 3; and the fourth offset corresponding to measurement event 4 is offset4, and both measurement event 4 and offset4 are included in measurement report configuration 4. offset1, offset2, offset3, and offset4 are different from each other. Figure 5A is a diagram illustrating configuring multiple measurement events using measurement configuration information. For details on why different offsets are configured for different measurement events and factors considered during offset configuration, please refer to the description of configuring a first offset for different measurement modes in the embodiment shown in Figure 2.

[0176] Alternatively, the same measurement event may correspond to multiple first offsets, and the remote UE determines the first offset to be used based on configured conditions. Measurement event 3 is used as an example. The remote UE can determine the offset to be used among the multiple offsets based on the SL channel quality of the current serving relay UE or the SL path loss between the serving relay UE and the remote UE. For example, a threshold or a value range is provided, and the remote UE determines the offset to be used based on whether the threshold or value range condition is met. This solution is applicable to any one of measurement events 1 to 4. For example, for measurement event 4, the multiple corresponding offsets are respectively associated with the SL channel quality ranges of the serving relay UE. For example, offset 1 in the multiple fourth offsets corresponds to the SL-RSRP of the relay UE being greater than (equal to or greater than) the second threshold. Offset 2 in the multiple fourth offsets corresponds to the SL-RSRP of the relay UE being less than (less than) the second threshold. After receiving the configuration, the remote UE determines whether to use offset1 or offset2 in the Z2 event based on the SL channel measurement result of the current serving relay UE. In another example, for measurement event 4, multiple corresponding offsets are associated with the SL path loss ranges of the serving relay UE, respectively. For example, offset1 in the multiple fourth offsets corresponds to the SL-RSRP of the relay UE being greater than (equal to or greater than) the third threshold. Offset2 in the multiple fourth offsets corresponds to the SL-RSRP of the relay UE being less than (less than) the third threshold. After receiving the configuration, the remote UE determines whether to use offset1 or offset2 in the Z2 event based on the SL path loss result between the remote UE and the current serving relay UE.In this configuration manner, the remote UE can determine the decision conditions for the Z2 measurement event based on the measurement status of the remote UE, so as to provide more accurate results to the network.

[0177] Alternatively, different measurement events may correspond to the same offset. For example, any multiple of offset1, offset2, offset3, and offset4 may be the same. For example, offset1 may be the same as offset2 but different from both offset3 and offset4, or offset2, offset3, and offset4 may be the same but different from offset1, or offset1, offset2, offset3, and offset4 may all be the same. Optionally, if offset1 to offset4 are all the same, the measurement configuration information may still be used to configure offsets for multiple measurement events separately, but the configured offset values ​​are the same. Alternatively, the measurement configuration information may be used to configure one offset for multiple measurement events, with different measurement events all corresponding to the offset, thereby reducing the overhead of the measurement configuration information. For example, an offset is configured using the measurement configuration information, and the offset is applicable to each of measurement event 1 to measurement event 4. When the measurement configuration information is used to configure one offset for multiple measurement events, the offset can be configured on the condition that any measurement event is configured using the measurement configuration information. The offset can be used regardless of the measurement event used by the remote UE. Figure 5B is a diagram illustrating configuring one offset using the measurement configuration information. This configuration method can simplify the configuration process and also simplify the process by which the remote UE determines whether the Z2 measurement event is satisfied.

[0178] When performing a measurement based on a measurement ID included in the measurement configuration information, the remote UE may perform the measurement based on a measurement target associated with the measurement ID, and may evaluate whether to perform reporting based on a measurement event in the measurement reporting configuration included in the measurement configuration information. It should be understood that when the measurement event in the measurement reporting configuration associated with the measurement ID is refined into a measurement scheme, for example, when the only measurement event included in the measurement reporting configuration is an event where the SD-RSRP of the candidate relay UE is a third offset better than the SL-RSRP of the serving relay UE, the measurement performed by the remote UE for the measurement ID needs to be performed based on a comparison between the SD-RSRP of the candidate relay UE and the SL-RSRP of the serving relay UE.

[0179] Optionally, the remote UE can further determine the offset configured in the measurement event based on the measurement result of the serving relay UE or the path loss result between the remote UE and the serving relay UE. For details, see the embodiment of Figure 2 and the description of the second and third thresholds.

[0180] Measurement events may be predefined in the protocol. For example, it may be predefined that only the SD-RSRP of the candidate relay UE is allowed to be used. In this case, measurement configuration information may be used to configure measurement event 2 and / or measurement event 3, but not to configure measurement event 1 and measurement event 4. Alternatively, it may be predefined in the protocol that only the SD-RSRP of the candidate relay UE is allowed to be used, and comparison is only allowed for measurement results of the same measurement type. This is equivalent to the remote UE being allowed to measure only the SD-RSRP of the serving relay UE and the SD-RSRP of the candidate relay UE. In this case, measurement configuration information may be used to configure only measurement event 2, but not to configure measurement event 1, measurement event 3, and measurement event 4. The measurement results of the SD-RSRP of the serving relay UE are compared with the measurement results of the SD-RSRP of the candidate relay UE. The comparison is fair because neither of the two measurements is affected by power control caused by SL path loss. Alternatively, it may be predefined in the protocol that SD-RSRP and SL-RSRP of the candidate relay are allowed to be used. In this case, measurement configuration information may be used to configure any one or more of measurement event 1 to measurement event 4. Alternatively, it may be predefined in the protocol that SD-RSRP and SL-RSRP of the candidate relay are allowed to be used, and comparison is only allowed for measurement results of the same measurement type. In this case, measurement configuration information may be used to configure measurement event 1 and / or measurement event 2, but may not be used to configure measurement event 3 and measurement event 4. A comparison is performed between measurement results of the serving relay UE and candidate relay UE of the same type. The comparison is fair because either neither of the two measurement results is affected by power control caused by SL path loss, or both measurement results are affected by power control caused by SL path loss.

[0181] Optionally, the measurement configuration information may be further used to configure one or more of the following: whether to report SL path loss, the first threshold, the second threshold, or the third threshold. For the content of this part, please refer to the related description of the embodiment shown in Figure 2. In the reference, the "measurement scheme" in the embodiment shown in Figure 2 may be replaced with the "measurement event" in this embodiment of the present application.

[0182] Alternatively, one or more of the first threshold, the second threshold, or the third threshold may not be configured by using measurement configuration information, but may, for example, be predefined in the protocol, or preconfigured in the UE, or configured by a higher layer of the UE (e.g., the RRC layer).

[0183] Optionally, the method further includes: S402: the remote UE transmitting a measurement report to the network device. Correspondingly, the network device receives the measurement report from the remote UE. For example, the remote UE may transmit the measurement report to the network device via a first relay UE. The measurement report may include a first measurement result, which is a measurement result obtained by the remote UE for at least one of the measurement events configured by using the measurement configuration information. In another example, in the architecture of FIG. 1B, the remote UE may directly transmit the measurement report to the network device.

[0184] The remote UE may perform measurements based on the measurement configuration information. If neither the second threshold nor the third threshold is configured by using the measurement configuration information (or the second threshold and / or the third threshold are not defined in the protocol), the remote UE may send a measurement report to the network device when the measurement result satisfies the measurement event configured by using the measurement configuration information, or if the second threshold and / or the third threshold are configured by using the measurement configuration information (or the second threshold and / or the third threshold are predefined in the protocol), the remote UE may send a measurement report to the network device when the second threshold and / or the third threshold are met and the measurement result satisfies the measurement event configured by using the measurement configuration information. Alternatively, if the second threshold and / or the third threshold are configured by using the measurement configuration information (or the second threshold and / or the third threshold are predefined in the protocol), an offset parameter of the measurement event may be determined based on the second threshold and / or the third threshold to determine the measurement event. The method for satisfying the second and third thresholds is described in S201.

[0185] Optionally, the measurement report can indicate a first path loss and / or a second path loss. The first path loss is the SL path loss between the remote UE and the first relay UE, and the second path loss is the SL path loss between the remote UE and the second relay UE. For further explanation of this part of the related content, for example, when the measurement report indicates a path loss, how the measurement report indicates the path loss and how the remote UE obtains the SL path loss, please refer to the embodiment shown in Figure 2 (for example, this embodiment of the present application may further include S403 and S404, which are similar to S203 and S204, respectively, in the embodiment shown in Figure 2).

[0186] For example, if the first measurement result indicates that the SL channel quality of the first relay UE is a first offset higher than the SL channel quality of the second relay UE, the network device determines, based on the measurement identifier included in the measurement report, that the remote UE measures the SL-RSRP of the first relay UE and measures the SD-RSRP of the second relay UE. In this case, optionally, the network device may instruct the remote UE to report the measurement result of the first relay UE. After receiving the measurement result of the first relay UE, the network device can determine whether the remote UE should perform a path switch. For example, if the measurement result of the first relay UE is greater than (or equal to) a fourth threshold, it indicates that the SL channel quality between the first relay UE and the remote UE is good. In this case, the network device can determine that the remote UE should not perform a path switch. If the measurement result of the first relay UE is less than or equal to (or less than) the fourth threshold, the network device may determine that the remote UE performs a path switch.

[0187] In another example, if the first measurement result indicates that the SL channel quality of the first relay UE is higher than the SL channel quality of the second relay UE by a first offset, the network device determines, based on the measurement identifier included in the measurement report, that the remote UE measures the SL-RSRP of the first relay UE and the SD-RSRP of the second relay UE, and that the measurement report further indicates a first path loss. In this case, the determination result of the network device may be that if the first path loss is less than (or equal to or less than) a fifth threshold, it indicates that the distance between the first relay UE and the remote UE is short. In this case, the SL channel quality between the first relay UE and the remote UE may be good, and the network device may determine that the remote UE should not perform a path switch. If the first path loss is equal to or greater than the fifth threshold, it indicates that the distance between the first relay UE and the remote UE is long, and the network device may determine that the remote UE should perform a path switch.

[0188] Alternatively, when the remote UE determines whether to perform a path switch or a relay UE reselection, step S402 may not be executed. For example, in this case, the method may further include step S405. The remote UE determines whether to perform a path switch or a relay UE reselection based on the first measurement result.

[0189] In this case, information such as measurement configuration information and thresholds (e.g., one or more of the first threshold, the second threshold, or the third threshold) may be pre-configured or distributed by a network device. If the measurement configuration information is determined through pre-configuration, the method may not include S401. The remote UE may perform measurements and measurement comparisons based on the configured information, but does not need to report measurement reports to the network. Instead, the remote UE makes a decision by itself to determine whether to perform relay UE reselection. Optionally, in this case, the measurement configuration information may not include a measurement identifier and a measurement report configuration, but may include, for example, an offset (e.g., one or more of the first to fourth offsets, or one offset applicable to various types of measurement events), and optionally, a measurement event (or a correspondence between a measurement event and an offset) and / or a threshold (e.g., one or more of the first threshold, the second threshold, or the third threshold).

[0190] In this embodiment of the present application, when the network device determines whether the remote UE should perform path switching or relay UE reselection, the network device may configure different measurement events to distinguish measurement types, so that the network device can know the specific status on the current SL and also obtain more information to determine whether the remote UE should perform path switching or relay UE reselection, which reduces the probability that the network device inappropriately or erroneously determines whether the remote UE should perform path switching or relay UE reselection.

[0191] When the remote UE determines whether to perform path switching or relay UE reselection, the remote UE is clear about the correspondence between the offset and the measurement event, and can therefore determine the measurement type corresponding to the corresponding offset, so that the decision result obtained by the remote UE regarding whether to perform path switching or relay UE reselection may be more accurate. Optionally, the remote UE can further determine a corresponding threshold, so that the remote UE can decide whether to perform path switching or relay UE reselection when it is more appropriate. This further improves the decision accuracy of the remote UE.

[0192] Equation 1 is explained above and is the power control equation for PSSCH over SL. PSSCH,D (i) is used in Equation 1, and the parameters relate to the dl-P0-PSSCH-PSCCH parameters configured by the network device. When the network device configures the dl-P0-PSSCH-PSCCH,

number

[0193] Similarly, the parameters used by the UE to determine the SL power based on the path loss on the Uu interface (also referred to as downlink path loss) further include dl-P0-PSBCH, which is used to configure the physical sidelink broadcast channel (PSBCH), and dl-P0-PSFCH, which is used to configure the physical sidelink feedback channel (PSFCH).

[0194] However, the remote UE may be located out of coverage (OOC) on the Uu interface, i.e., outside the coverage of the network device. Figure 6 illustrates this scenario. In Figure 6, the remote UE is referred to as a remote UE. In this case, if the network device still configures power control configuration parameters, such as dl-P0-PSSCH-PSCCH parameters, for the remote UE based on downlink path loss (e.g., the network device configures dl-P0-PSSCH-PSCCH parameters for the remote UE directly or via a relay path), when performing SL transmission, the remote UE needs to calculate transmit power based on the path loss on the Uu interface for transmission on the corresponding channel. However, because the remote UE is in an OOC state on the Uu interface, the remote UE may not obtain the Uu interface path loss. As a result, the remote UE cannot calculate SL transmit power and cannot perform SL transmission.

[0195] In view of this, an embodiment of the present application provides a third communication method. According to this method, a remote UE can perform SL transmission even in an OOC state. Figure 7 is a flowchart of this method. The method can be applied to the network architecture shown in Figure 6. For example, the remote UE in the method may be the remote UE in Figure 6, the serving relay UE in the method may be the serving relay UE in Figure 6, and the network device in the method may be the network device in Figure 6.

[0196] S701: A network device sends configuration information. Correspondingly, a remote UE (represented as a remote UE in FIG. 7) receives the configuration information.

[0197] Optionally, the network device may send configuration information to a serving relay UE (represented as a serving relay UE in FIG. 7) of the remote UE. After receiving the configuration information, the serving relay UE determines that the configuration information is information used by the remote UE for configuration. In this case, the serving relay UE can send the configuration information to the remote UE. In this case, the remote UE can receive the configuration information from the serving relay UE.

[0198] Alternatively, the network device may directly transmit the configuration information to the remote UE via a relay path between the network device and the remote UE, in which case the remote UE can receive the configuration information from the network device via a serving relay UE.

[0199] Optionally, the configuration information may be included in a system message, such as system information block 12 (SIB12), or another system message. For example, in a scenario where a remote UE can receive configuration information from a serving relay UE, the network device may transmit the configuration information via SIB12. In this case, the serving relay UE can receive SIB12. The serving relay UE then transmits SIB12 to the remote UE.

[0200] Alternatively, the configuration information may be included in dedicated signaling, such as an RRC message. The RRC message may be, for example, an RRC reconfiguration message or another RRC message. For example, in a scenario in which the remote UE receives configuration information from the network device via a serving relay UE, the network device may transmit the configuration information to the remote UE via dedicated signaling.

[0201] The configuration information may include at least one parameter used to configure a first resource pool. The resource pool in this embodiment of the present application is, for example, a SL resource pool that can be used to perform SL transmission between a remote UE and another UE. Optionally, the configuration information may be used to configure one or more resource pools. In this case, the configuration information may include one or more sets of parameters used to configure the one or more resource pools. One set of parameters is used to configure one resource pool, the first resource pool is any resource pool in the one or more resource pools, and the at least one parameter is a set of parameters used to configure the first resource pool.

[0202] The at least one parameter may include a first parameter, which may be used by the remote UE to perform SL power control based on a path loss between the remote UE and a network device. For example, the first parameter may indicate performing SL power control based on a path loss between the remote UE and a network device, or the first parameter may indicate a value of P0 in SL power control performed based on the downlink path loss of the remote UE, or the first parameter may be used by the remote UE to perform SL power control based on the downlink path loss of the remote UE. For example, the first parameter is a dl-P0-PSSCH-PSCCH parameter, or the first parameter is a dl-P0-PSBCH parameter, or the first parameter is a dl-P0-PSFCH parameter or another power control parameter. This is not limited herein. For example, in one or more sets of parameters, each set of parameters in the at least one set of parameters may include the first parameter. In other words, among the parameters included in the configuration information and used to configure one or more resource pools, the parameters that can be used to configure each resource pool in at least one of the resource pools include a first parameter, and the first resource pool is any one of the at least one resource pool. The manner in which the remote UE processes the parameters used to configure the at least one resource pool may be similar. The first resource pool is used as an example in this specification.

[0203] In this embodiment, the first parameter may be dl-P0-PSSCH-PSCCH, which indicates the value of parameter P0 in power control performed by the remote UE for the PSCCH / PSSCH based on downlink path loss. Alternatively, the first parameter may be dl-P0-PSBCH, which indicates the value of parameter P0 in power control performed by the remote UE for the PSBCH based on downlink path loss. Alternatively, the first parameter may be dl-P0-PSFCH, which indicates the value of parameter P0 in power control performed by the remote UE for the PSFCH based on downlink path loss. The first parameter may further include another parameter affecting SL power control, which is not limited herein. Upon receiving the first parameter, the terminal performs SL power control by taking downlink path loss into account based on the first parameter provided by the network. When the first parameter is not received, power control based on downlink path loss is considered to be disabled. For example, if the terminal does not receive dl-P0-PSSCH-PSCCH, power control based on downlink path loss on PSCCH / PSSCH is considered to be ineffective.

[0204] S702: If the remote UE is out of coverage, ignore the first parameter, and consider the first parameter to be not configured or not provided, or ignore at least one parameter, and consider the at least one parameter to be not configured or not provided, or disable the first parameter, or disable sidelink power control performed based on the path loss between the remote UE and the network device.

[0205] When the remote UE is out-of-context, it is likely that the remote UE cannot obtain the Uu interface path loss between the remote UE and the network device. Therefore, the remote UE may ignore the first parameter. For example, the remaining parameters other than the first parameter in the at least one parameter are normally used, but the first parameter is not used. In this case, it is equivalent to the first resource pool being configured for the remote UE. The remote UE may use the first resource pool, but the first resource pool may not be configured or the first parameter may not be provided. When the remote UE performs SL transmission by using resources in the first resource pool, the path loss between the remote UE and the network device does not need to be considered. For example, the remote UE may ignore the first parameter as follows: An upper layer (e.g., an RRC layer) of the remote UE submits another parameter other than the first parameter in the at least one parameter to a lower layer (e.g., a medium access control (MAC) layer or a physical (PHY) layer) of the remote UE, and does not submit the first parameter in the at least one parameter to the lower layer.

[0206] Alternatively, when the remote UE is in the out-of-band (OOC) state, the remote UE may ignore at least one parameter. In other words, none of the at least one parameter is used. This is equivalent to the remote UE not accepting the configuration of the first resource pool. In this case, the remote UE cannot use the first resource pool. Therefore, this method can also be described as the remote UE ignoring the first resource pool or ignoring the configuration of the first resource pool. This implementation method is simple. The remote UE does not need to identify the first parameter from the at least one parameter, but completely ignores the at least one parameter. For example, the remote UE can ignore at least one parameter by having the upper layer (e.g., RRC layer) of the remote UE not deliver the at least one parameter to the lower layer (e.g., MAC layer or physical layer) of the remote UE.

[0207] For example, in the code, the configuration information is a code block, and the code block includes multiple code segments. One code segment within the code segments (e.g., referred to as code segment A) is used to configure a first resource pool and includes information on at least one parameter. For example, in the code, the remote UE ignoring the first parameter may be expressed as the remote UE may ignore information A in code segment A, and information A represents the first parameter. For example, in the code, the remote UE ignoring the at least one parameter (or ignoring the first resource pool, or ignoring the configuration of the first resource pool) may be expressed as the remote UE may ignore code segment A.

[0208] Alternatively, when the remote UE is in OOC, the remote UE disables the first parameter. In other words, when the remote UE receives the first parameter, the remote UE considers that downlink path loss-based SL power control is disabled in the resource pool configuration. For example, when it is determined that the remote UE is in OOC and the at least one parameter received by the remote UE includes the first parameter, the remote UE considers that downlink path loss-based SL power control is disabled or not configured, and therefore does not provide the first parameter to lower layers.

[0209] In this embodiment, the first parameter may be dl-P0-PSSCH-PSCCH, which indicates the value of parameter P0 in power control performed by the remote UE for the PSCCH / PSSCH based on the downlink path loss. Alternatively, the first parameter may be dl-P0-PSBCH, which indicates the value of parameter P0 in power control of the PSBCH by the remote UE based on the downlink path loss. Alternatively, the first parameter may be dl-P0-PSFCH, which indicates the value of parameter P0 in power control performed by the remote UE for the PSFCH based on the downlink path loss. The first parameter may further include another parameter affecting SL power control, which is not limited herein. After receiving the first parameter, the remote UE has different behaviors depending on the coverage status of the remote UE. Upon receiving the first parameter, the in-coverage remote UE performs SL power control by taking the downlink path loss into account based on the first parameter provided by the network. When an out-of-coverage remote UE receives the first parameter, it assumes that downlink path loss-based power control is disabled. For example, when an in-coverage remote UE receives the dl-P0-PSSCH-PSCCH, it assumes that downlink path loss-based power control on the PSCCH / PSSCH is disabled, or ignores the dl-P0-PSSCH-PSCCH, or assumes that the dl-P0-PSSCH-PSCCH is not configured. In another example, when an in-coverage remote UE receives the dl-P0-PSFCH, it assumes that downlink path loss-based power control on the PSFCH is disabled, or ignores the dl-P0-PSFCH, or assumes that the dl-P0-PSFCH is not configured. In another example, upon receiving the dl-P0-PSBCH, the remote UE in the OOC may assume that downlink path loss based power control on the PSBCH is disabled, or may ignore the dl-P0-PSBCH, or may assume that the dl-P0-PSBCH is not configured.

[0210] In this embodiment of the present application, even if a remote UE in an OOC environment receives the first parameter, the remote UE may ignore the first parameter, not use the first parameter, or consider the first parameter to be unconfigured or not provided, or consider downlink path loss-based power control to be disabled or not configured. In this case, the remote UE in an OOC environment does not need to perform SL power control based on the path loss of the Uu interface to improve the success rate of calculating the SL transmission power. This improves the success rate of SL transmission. In addition, in this embodiment of the present application, the upper layer of the remote UE may determine whether to send corresponding parameters to the lower layer. Alternatively, in the OOC environment, the upper layer determines whether the current function is configured or disabled, and the lower layer only needs to perform corresponding operations based on the received parameters, and does not need to change the SL power control logic of the lower layer.

[0211] Next, an embodiment of the present application provides a fourth communication method. According to this method, a remote UE can perform SL transmission even in an OOC state. Figure 8 is a flowchart of this method. The method can be applied to the network architecture shown in Figure 6. For example, the remote UE in the method may be the remote UE in Figure 6, the serving relay UE in the method may be the serving relay UE in Figure 6, and the network device in the method may be the network device in Figure 6.

[0212] S801: A remote UE (represented as a remote UE in FIG. 8) sends first indication information. In response, a network device receives the first indication information. The first indication information may indicate that the remote UE is out of coverage, for example, that the remote UE is out of coverage.

[0213] Optionally, the remote UE may send first indication information to the network device when the coverage status of the remote UE changes, so that the network device can know the coverage status of the remote UE in a timely manner. For example, when the coverage status of the remote UE changes from in-coverage to out-of-coverage, the remote UE may send the first indication information to the network device.

[0214] Optionally, the remote UE may periodically send the first indication information to the network device so that the network device can continuously know the coverage status of the remote UE. For example, the remote UE may send the first indication information to the network device based on a network-configured period T1 or a preconfigured period T2. T1 may be the same as or different from T2.

[0215] The first indication information may be carried by dedicated signaling and transmitted to the network device via a serving relay UE of the remote UE (represented as a serving relay UE in FIG. 8 ). The dedicated signaling may be, for example, an RRC message, sidelink user equipment information (SUI), etc.

[0216] For example, if a relay path (e.g., an RRC connection) between the remote UE and the network device has not been established, the remote UE may send first indication information to the network device via an RRC message. The RRC message may be used to request the establishment of a relay path (e.g., an RRC connection) between the remote UE and the network device and may further include the first indication information. Thus, the first indication information does not need to be transmitted through additional signaling to reduce transmission overhead. The RRC message may be, for example, an RRC connection setup request message, an RRC connection resume request message, or an RRC connection re-establishment request message.

[0217] In another example, if a relay path (e.g., an RRC connection) between the remote UE and the network device is established, the remote UE may send first indication information to the network device via the SUI.

[0218] Alternatively, the first indication information may be sent to a serving relay UE of the remote UE. Then, the first indication information is sent to the network device by the serving relay UE. For example, the remote UE can send the first indication information to the serving relay UE through a PC5-signaling (S) message, a discovery message, a PC5-RRC message, etc. Then, the serving relay UE sends the first indication information to the network device through an RRC message or another message.

[0219] This step can be used separately from the subsequent steps or in combination with other embodiments, which are not limited herein.

[0220] S802: The network device transmits first configuration information, and the remote UE receives the first configuration information in response.

[0221] The network device may send the first configuration information to the remote UE via the serving relay UE, for example, by sending the first configuration information through dedicated signaling, for example, an RRC message.

[0222] Alternatively, the network device may transmit the first configuration information to a serving relay UE of the remote UE, and the serving relay UE may transmit the first configuration information to the remote UE. For example, the network device may transmit the first configuration information through a system message such as SIB12, and the serving relay UE may receive SIB12 and transmit SIB12 to the remote UE.

[0223] The first configuration information may include at least one parameter used to configure a first resource pool. The resource pool in this embodiment of the present application is, for example, a SL resource pool that can be used to perform SL transmission between a remote UE and another UE. Optionally, the first configuration information may be used to configure one or more resource pools. In this case, the first configuration information may include one or more sets of parameters used to configure the one or more resource pools. One set of parameters is used to configure one resource pool, the first resource pool is any resource pool in the one or more resource pools, and the at least one parameter is a set of parameters used to configure the first resource pool.

[0224] The network device receives the first indication information and determines that the remote UE is out-of-band. Therefore, at least one parameter does not include the first parameter. This is equivalent to the network device not transmitting the first parameter. The first parameter may indicate that SL power control is performed based on a path loss between the remote UE and the network device. For example, the first parameter is a dl-P0-PSSCH-PSCCH parameter. For a remote UE that does not transmit the first indication information, the at least one parameter delivered by the network device may include the first parameter. For example, in one or more parameter sets, each parameter set in the at least one parameter set may not include the first parameter. In other words, in the parameters included in the configuration information and used to configure one or more resource pools, a parameter that may be used to configure each resource pool in at least one of the resource pools does not include the first parameter, and the first resource pool is any one of the at least one resource pools. The first resource pool is used as an example in this specification.

[0225] In this embodiment of the present application, the network device is able to know that the remote UE is in OOC, so that the parameters delivered by the network device can be reduced, and the transmission overhead can be reduced. In addition, the remote UE only needs to perform processing based on the received parameters, and does not need to change the SL power control logic of the remote UE.

[0226] Next, an embodiment of the present application provides a fifth communication method. According to this method, a remote UE can perform SL transmission even in an OOC state. Figure 9 is a flowchart of this method. The method can be applied to the network architecture shown in Figure 6. For example, the remote UE in the method may be the remote UE in Figure 6, the serving relay UE in the method may be the serving relay UE in Figure 6, and the network device in the method may be the network device in Figure 6.

[0227] S901: A remote UE (represented as a remote UE in FIG. 8) sends first indication information. Correspondingly, a serving relay UE (represented as a serving relay UE in FIG. 8) receives first indication information. The serving relay UE is a serving relay UE of the remote UE. The first indication information may indicate that the remote UE is out of coverage, for example, that the remote UE is in OOC.

[0228] Optionally, the remote UE may send first indication information to the serving relay UE when the coverage status of the remote UE changes, so that the serving relay UE can know the coverage status of the remote UE in a timely manner. For example, when the coverage status of the remote UE changes from in-coverage to out-of-coverage, the remote UE may send the first indication information to the serving relay UE.

[0229] Optionally, the remote UE may periodically transmit the first indication information to the serving relay UE, so that the serving relay UE can continuously know the coverage status of the remote UE. For example, the remote UE transmits the first indication information to the relay UE based on a network-configured period T1 or a preconfigured period T2. T1 may be the same as or different from T2.

[0230] Optionally, the remote UE may send the first indication information to the serving relay UE via a PC5-S message, a discovery message, a PC5-RRC message, or the like.

[0231] This step can be used separately from the subsequent steps or in combination with other embodiments, which are not limited herein.

[0232] S902: The network device transmits second configuration information. In response, the serving relay UE receives the second configuration information. S901 may be performed before S902, after S902, or simultaneously with S902.

[0233] For example, the network device may send second configuration information to the serving relay UE. The serving relay UE then sends the corresponding configuration to the remote UE. For example, the network device may send the second configuration information through a system message such as SIB12, and the serving relay UE may receive SIB12.

[0234] The second configuration information may include at least one parameter used to configure a first resource pool. The resource pool in this embodiment of the present application is, for example, a SL resource pool that can be used to perform SL transmission between a remote UE and another UE. Optionally, the second configuration information may be used to configure one or more resource pools. In this case, the second configuration information may include one or more sets of parameters used to configure the one or more resource pools. One set of parameters is used to configure one resource pool, the first resource pool is any resource pool in the one or more resource pools, and the at least one parameter is a set of parameters used to configure the first resource pool.

[0235] The at least one parameter may include a first parameter, and the first parameter may indicate performing SL power control based on a path loss between the remote UE and the network device. For example, the first parameter is a dl-P0-PSSCH-PSCCH parameter. For example, in one or more sets of parameters, each of the at least one set of parameters may include the first parameter. In other words, in the parameters included in the second configuration information and used to configure one or more resource pools, a parameter that may be used to configure each resource pool in at least one of the resource pools includes the first parameter, and the first resource pool is any one of the at least one resource pool. A manner in which the serving relay UE processes the parameters used to configure the at least one resource pool may be similar. The first resource pool is used as an example in this specification.

[0236] Because the serving relay UE receives the first indication information and determines that the remote UE is out of control, the serving relay UE does not need to directly forward the second configuration information to the remote UE. Optionally, the method may further include S903. The serving relay UE transmits the first configuration information to the remote UE. Correspondingly, the remote UE receives the first configuration information from the serving relay UE. For example, the serving relay UE may obtain the first configuration information based on the second configuration information and transmit the first configuration information to the remote UE. The first configuration information may include remaining parameters other than the first parameter in the at least one parameter. An optional manner in which the serving relay UE obtains the first configuration information based on the second configuration information is as follows: To obtain the first configuration information, the serving relay UE removes the first parameter from the at least one parameter included in the second configuration information. The serving relay UE may only remove the first parameter, and another parameter may still be sent to the remote UE, so that the remote UE can obtain the configuration of the network device.

[0237] Alternatively, optionally, the method may further include S904. The serving relay UE ignores the second configuration information or ignores at least one parameter. For example, if the second configuration information includes only at least one parameter but does not include a parameter used to configure another resource pool, the serving relay UE may ignore the second configuration information. Alternatively, if the second configuration information includes multiple sets of parameters used to configure multiple resource pools, and each set of parameters includes the first parameter, the serving relay UE may also ignore the second configuration information. Alternatively, if the second configuration information includes multiple sets of parameters used to configure multiple resource pools, and each set of parameters in at least one set of parameters does not include the first parameter, the serving relay UE may ignore at least one parameter but does not ignore the second configuration information. For example, the serving relay UE may send the remaining parameters included in the second configuration information to the remote UE, and the remaining parameters may not include the first parameter. The serving relay UE may ignore the entire set of configuration parameters of the resource pool or ignore the configuration information, which is easier to implement for the serving relay UE and may also reduce the transmission overhead between the serving relay UE and the remote UE.

[0238] In this embodiment of the present application, the serving relay UE is enabled to know that the remote UE is in the OOC, so that the parameters transmitted by the serving relay UE can be reduced, and the transmission overhead can be reduced. In addition, the remote UE only needs to perform processing based on the received parameters, and does not need to change the SL power control logic of the remote UE.

[0239] FIG. 10 is a diagram of the structure of a communication device according to an embodiment of the present application. The communication device 1000 may be a remote UE or a circuit system of a remote UE in the embodiments shown in any one of FIG. 2, FIG. 4, FIG. 7, FIG. 8, or FIG. 9, and is configured to implement a method corresponding to the remote UE in the above-mentioned method embodiments. Alternatively, the communication device 1000 may be a network device or a circuit system of a network device in the embodiments shown in any one of FIG. 2, FIG. 4, FIG. 7, FIG. 8, or FIG. 9, and is configured to implement a method corresponding to the network device in the above-mentioned method embodiments. Alternatively, the communication device 1000 may be a serving relay UE or a circuit system of a serving relay UE in the embodiment shown in FIG. 9, and is configured to implement a method corresponding to the serving relay UE in the above-mentioned method embodiments. For specific functions, please refer to the description of the above-mentioned method embodiments. For example, the circuit system is a chip system.

[0240] The communications device 1000 includes at least one processor 1001. The processor 1001 may be configured to perform internal processing of the device to implement certain control processing functions. Optionally, the processor 1001 includes instructions. Optionally, the processor 1001 may store data. Optionally, different processors may be independent components, may be located in different physical locations, or may be located on different integrated circuits. Optionally, different processors may be integrated into one or more processors, for example, integrated into one or more integrated circuits.

[0241] Optionally, the communications device 1000 includes one or more memories 1003 configured to store instructions. Optionally, the memory 1003 may further store data. The processor and memory may be located separately or integrated together.

[0242] Optionally, communication device 1000 includes communication line 1002 and at least one communication interface 1004. Memory 1003, communication line 1002, and communication interface 1004 are all optional and therefore are all represented by dashed lines in FIG.

[0243] Optionally, the communication device 1000 may further include a transceiver and / or an antenna. The transceiver may be configured to transmit information to or receive information from another device. The transceiver may also be referred to as a transceiver machine, transceiver circuit, input / output interface, etc., and is configured to implement the receiving and transmitting functions of the communication device 1000 via the antenna. Optionally, the transceiver includes a transmitter and a receiver. For example, the transmitter may be configured to generate a radio frequency signal based on a baseband signal, and the receiver may be configured to convert the radio frequency signal into a baseband signal.

[0244] The processor 1001 may include a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to control program execution in the solutions of the present application.

[0245] Communication lines 1002 may include paths for transmitting information between the above components.

[0246] The communication interface 1004 may be any device, such as a transceiver, configured to communicate with another device or a communication network, such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), or a wired access network.

[0247] The memory 1003 may be, but is not limited to, a read-only memory (ROM) or another type of static storage device capable of storing static information and instructions, or a random access memory (RAM) or another type of dynamic storage device capable of storing information and instructions, or may be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, an optical disk storage (including a compact optical disk, a laser disk, an optical disk, a digital versatile optical disk, a blue light disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing expected program code in the form of instructions or data structures and accessible by a computer. The memory 1003 may exist independently or be connected to the processor 1001 via communication line 1002. Alternatively, the memory 1003 may be integrated with the processor 1001.

[0248] The memory 1003 is configured to store computer-executable instructions for executing the solutions of the present application, and the processor 1001 controls the execution. The processor 1001 is configured to execute the computer-executable instructions stored in the memory 1003 to implement the communication methods provided in the above-mentioned embodiments of the present application.

[0249] Optionally, the computer-executable instructions in this embodiment of the present application may also be referred to as application program code, which is not particularly limited in this embodiment of the present application.

[0250] Among specific implementations, in one embodiment, processor 1001 may include one or more CPUs, such as CPU 0 and CPU 1 of FIG.

[0251] Among specific implementations, in one embodiment, communications device 1000 may include multiple processors, such as processor 1001 and processor 1005 of FIG. 10. Each of the processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may be one or more devices, circuits, and / or processing cores configured to process data (e.g., computer program instructions).

[0252] 10 is a chip, for example, a chip of a remote UE, a chip of a network device, or a chip of a serving relay UE, the chip includes a processor 1001 (which may further include a processor 1005), a communication line 1002, and a communication interface 1004. Optionally, the device may further include a memory 1003. For example, the communication interface 1004 may be an input interface, a pin, a circuit, etc. The memory 1003 may be a register, a buffer, etc. The processor 1001 and the processor 1005 may each be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits configured to control program execution of the method in any one of the above-mentioned embodiments.

[0253] In the embodiments of the present application, the device may be divided into functional modules based on the above-described method examples. For example, each functional module may be obtained through division based on its corresponding function, or two or more functions may be integrated into one processing module. The integrated module may be implemented in the form of hardware or software functional module. Note that in the embodiments of the present application, the module division is an example and is merely a logical functional division. In actual implementation, other division schemes may be used. For example, FIG. 11 illustrates a diagram of the device when each functional module is obtained through division based on its corresponding function. The device 1100 may be a remote UE, a network device, or a serving relay UE in the above-described method embodiments, or a chip in the remote UE, a chip in the network device, or a chip in the serving relay UE. The device 1100 includes a transmitting unit 1101, a processing unit 1102, and a receiving unit 1103.

[0254] It should be understood that the apparatus 1100 may be configured to implement steps performed by a remote UE, a network device, or a serving relay UE in the method in the embodiments of the present application. For related features, please refer to the above-mentioned embodiments. The details will not be described again in this specification.

[0255] Optionally, the functions / implementation processes of the transmitting unit 1101, the receiving unit 1103, and the processing unit 1102 in Figure 11 may be implemented by the processor 1001 in Figure 10 by invoking computer-executable instructions stored in memory 1003. Alternatively, the functions / implementation processes of the processing unit 1102 in Figure 11 may be implemented by the processor 1001 in Figure 10 by invoking computer-executable instructions stored in memory 1003, and the functions / implementation processes of the transmitting unit 1101 and the receiving unit 1103 in Figure 11 may be implemented via the communication interface 1004 in Figure 10.

[0256] Optionally, when the device 1100 is a chip or a circuit, the functions / implementation processes of the sending unit 1101 and the receiving unit 1103 may alternatively be implemented by pins, circuits, etc.

[0257] The present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program or instructions. When the computer program or instructions are executed, the method performed by the remote UE, the network device, or the serving relay UE in the above-described method embodiments is implemented. In this manner, the functions in the above-described embodiments may be implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application may essentially be implemented in the form of a software product, or a portion of the technical solution may be implemented in the form of a software product. The computer software product may be stored in a storage medium and include instructions for instructing a computer device (such as a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The storage medium may include any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0258] The present application further provides a computer program product, which includes computer program code, which, when executed on a computer, enables the computer to perform the method performed by the remote UE, the network device, or the serving relay UE in any one of the above-described method embodiments.

[0259] An embodiment of the present application further provides a processing device, including a processor and an interface, wherein the processor is configured to perform a method performed by a remote UE, a network device, or a serving relay UE in any one of the above-mentioned method embodiments.

[0260] All or part of the above-described embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement an embodiment, all or part of the embodiment may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded into a computer and executed, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or another 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 wired (e.g., coaxial cable, optical fiber, or digital subscriber line (DSL)) or wireless (e.g., infrared, radio, or microwave) transmission. The computer-readable storage medium may be any available medium accessible by a computer or a data storage device, such as a server or data center integrating one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, hard disk, or magnetic tape), an optical medium (e.g., a DVD), a semiconductor medium (e.g., a solid-state drive (SSD)), or the like.

[0261] The various exemplary logic units and circuits described in the embodiments of the present application may implement or perform the described functions by designing a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor. Optionally, a general-purpose processor may alternatively be any conventional processor, controller, microcontroller, or state machine. A processor may alternatively be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other similar configuration.

[0262] The steps of a method or algorithm described in the embodiments of the present application may be embodied directly in hardware, in a software unit executed by a processor, or a combination thereof. The software unit may be stored in a RAM, a flash memory, a ROM, an erasable programmable read-only memory (EPROM), an EEPROM, a register, a hard disk, a removable magnetic disk, a CD-ROM, or any other form of storage medium known in the art. For example, the storage medium may be connected to the processor so that the processor can read information from and write information to the storage medium. Alternatively, the storage medium may be integrated into the processor. The processor and the storage medium may be located in an ASIC, and the ASIC may be located in a terminal device. Alternatively, the processor and the storage medium may be located in different parts of the terminal device.

[0263] These computer program instructions may alternatively be loaded into a computer or other programmable data processing device such that a sequence of operations and steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing a particular function in one or more processes in the flowcharts and / or one or more blocks in the block diagrams.

[0264] Although the embodiments of the present application have been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made to the embodiments of the present application without departing from the scope of the embodiments of the present application. Correspondingly, the embodiments of the present application and the accompanying drawings are merely exemplary illustrations of the embodiments of the present application as defined by the appended claims, and are deemed to encompass any or all modifications, variations, combinations, or equivalents within the scope of the embodiments of the present application. It is apparent that those skilled in the art may make various modifications and variations to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, the embodiments of the present application are also intended to encompass these modifications and variations as long as they fall within the scope of the claims of the embodiments of the present application and their equivalent technology. [Explanation of symbols]

[0265] 1. Network Devices 2. Network Devices 3. Network Devices 12 System Information Block 1000 Communication Equipment 1001 processor 1002 Communication lines 1003 memory 1004 Communication Interface 1005 processor 1100 equipment 1101 Transmitting unit 1102 Processing Unit 1103 receiving unit

Claims

1. 1. A communication method applied to a remote device, the method comprising: receiving measurement configuration information, the measurement configuration information including a measurement event, the measurement event being an event in which a signal quality of a candidate relay device becomes better than a signal quality of a serving relay device by a first offset; sending a measurement report to a network device, the measurement report including a first measurement result and first indication information, the first measurement result being a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicating a measurement type corresponding to the first measurement result; A method comprising:

2. The measurement type corresponding to the first measurement result is: the measurement result of the first relay device is the sidelink reference signal received power (SL-RSRP); the measurement result of the first relay device is Sidelink Discovery Reference Signal Received Power (SD-RSRP); The measurement result of the second intermediate device is SL-RSRP; The measurement result of the second intermediate device is SD-RSRP; whether the measurement result of the first intermediate device is SL-RSRP, or Whether the measurement result of the second intermediate device is SL-RSRP; and the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device; The method of claim 1.

3. the measurement report further indicates a first path loss and / or a second path loss; or the first measurement indicates a first path loss and / or a second path loss; the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is the serving relay device of the remote device, and the second relay device is the candidate relay device of the remote device; 3. The method according to claim 1 or 2.

4. The step of indicating a first path loss includes: including the first path loss value; or including a step of including a second indication, the second indication indicating a range to which the first path loss value belongs or indicating whether the value of the first path loss is greater than a first threshold. The method of claim 3.

5. The method comprises: sending first request information to the first relay device, the first request information being used to inquire about sidelink power control information of the first relay device or to inquire about the sidelink path loss of the first relay device; receiving first information from the first relay device, the first information indicating whether the first relay device performs sidelink power control based on the sidelink path loss or indicating the first path loss; 5. The method of claim 3 or 4, further comprising:

6. The method comprises: sending second request information to the second relay device, the second request information being used to inquire about sidelink power control information of the second relay device or to inquire about the sidelink path loss of the second relay device; receiving second information from the second relay device, the second information indicating whether the second relay device performs sidelink power control based on the sidelink pathloss or indicating the second pathloss; The method of any one of claims 3 to 5, further comprising:

7. transmitting the measurement report corresponding to the measurement event to the network device, sending the measurement report to the network device if the measurement result of a first relay device is smaller than a second threshold and / or a sidelink path loss between the remote device and the first relay device is larger than a third threshold, wherein the first relay device is the serving relay device of the remote device. The method according to any one of claims 1 to 6, comprising:

8. The method comprises: skipping transmitting the measurement report if the measurement result of the first relay device is greater than the second threshold and / or the sidelink path loss between the remote device and the first relay device is less than the third threshold, wherein the first relay device is the serving relay device of the remote device. The method of any one of claims 1 to 7, further comprising:

9. The method comprises: if the measurement result of the first relay device is smaller than a second threshold and / or the sidelink path loss between the remote device and the first relay device is larger than a third threshold, initiating measurements on candidate relay devices for the remote device, wherein the first relay device is the serving relay device of the remote device. The method of any one of claims 1 to 6, further comprising:

10. The method comprises: skipping measuring the candidate relay devices for the remote device if the measurement result of a first relay device is greater than the second threshold and / or the sidelink path loss between the remote device and the first relay device is less than the third threshold, wherein the first relay device is the serving relay device for the remote device.

10. The method of any one of claims 1 to 6 or 9, further comprising:

11. The method according to any one of claims 1 to 10, wherein the measurement configuration information includes information about at least one measurement scheme corresponding to the measurement event.

12. The at least one measurement method is as follows: measuring the SL-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay devices; measuring the SD-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay devices; measuring the SL-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay devices; or measuring the SD-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay devices; The method of claim 11 , comprising one or more of:

13. The measurement configuration information includes: whether to report a measurement type corresponding to the measurement result of the measurement event; Whether to report sidelink path loss, the first threshold value, which is used by the remote device to determine a sidelink path loss indicated by the measurement report; the second threshold value, the second threshold value corresponding to the measurement result of the first relay device, the second threshold value being used by the remote device to determine whether to send the measurement report, or the second threshold value being used by the remote device to determine the first offset of the measurement event, or the second threshold value being used by the remote device to determine whether to measure the candidate relay device, the first relay device being the serving relay device of the remote device; or the third threshold, the third threshold being a sidelink path loss threshold, the third threshold being used by the remote device to determine whether to transmit the measurement report, or to determine whether to measure the candidate relay device, or to determine the first offset for the measurement event; The method of any one of claims 1 to 12, further used to configure one or more of:

14. 1. A communication method applied to a network device, the method comprising: sending measurement configuration information to a remote device, the measurement configuration information including a measurement event, the measurement event being an event in which a signal quality of a candidate relay device becomes better than a signal quality of a serving relay device by a first offset; receiving a measurement report corresponding to the measurement configuration information from the remote device, the measurement report including a first measurement result and first indication information, the first measurement result being a result of a measurement performed by the remote device based on the measurement configuration information, and the first indication information indicating a measurement type corresponding to the first measurement result; A communication method, including:

15. The measurement type corresponding to the first measurement result is: The measurement result of the first intermediate device is SL-RSRP; The measurement result of the first intermediate device is SD-RSRP; The measurement result of the second intermediate device is SL-RSRP; The measurement result of the second intermediate device is SD-RSRP; whether the measurement result of the first intermediate device is SL-RSRP, or Whether the measurement result of the second intermediate device is SL-RSRP; and the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device; The method of claim 14.

16. the measurement report further indicates a first path loss and / or a second path loss; or the first measurement indicates a first path loss and / or a second path loss; the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is the serving relay device of the remote device, and the second relay device is the candidate relay device of the remote device; 16. The method of claim 14 or 15.

17. The step of indicating a first path loss includes: including the first path loss value; or including a step of including a second indication, the second indication indicating a range to which the first path loss value belongs or indicating whether the value of the first path loss is greater than a first threshold.

17. The method of claim 16.

18. The method according to any one of claims 14 to 17, wherein the measurement configuration information includes information about at least one measurement scheme corresponding to the measurement event.

19. The at least one measurement method is as follows: measuring the SL-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay devices; measuring the SD-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay devices; measuring the SL-RSRP of the serving relay device and measuring the SD-RSRP of the candidate relay devices; or measuring the SD-RSRP of the serving relay device and measuring the SL-RSRP of the candidate relay devices; 20. The method of claim 18, comprising one or more of:

20. The measurement configuration information includes: whether to report a measurement type corresponding to the measurement result of the measurement event; Whether to report sidelink path loss, the first threshold value, which is used by the remote device to determine a sidelink path loss indicated by the measurement report; a second threshold value corresponding to the measurement result of the first relay device, the second threshold value being used by the remote device to determine whether to send the measurement report, or the second threshold value being used by the remote device to determine the first offset of the measurement event, or the second threshold value being used by the remote device to determine whether to measure the candidate relay device, the first relay device being the serving relay device of the remote device; or a third threshold, the third threshold being a sidelink path loss threshold, the third threshold being used by the remote device to determine whether to transmit the measurement report, or to determine whether to measure the candidate relay device, or to determine the first offset for the measurement event; The method according to any one of claims 14 to 19, further used to configure one or more of:

21. 1. A communication method applied to a remote device, the method comprising: receiving measurement configuration information, the measurement configuration information including measurement events; sending a measurement report to a network device, the measurement report including a measurement result corresponding to at least one measurement event in the measurement events; Including, The measurement configuration information includes the following measurement events: the event that the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset; the event that the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset; The event that the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset; or The event that the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset. A method comprising any one or more of the following:

22. the measurement report further indicates a first path loss and / or a second path loss; or the first measurement indicates a first path loss and / or a second path loss; the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device; 22. The method of claim 21.

23. The step of indicating a first path loss includes: including the first path loss value; or including a step of including a second indication, the second indication indicating a range to which the first path loss value belongs or indicating whether the value of the first path loss is greater than a first threshold.

23. The method of claim 22.

24. The method comprises: sending first request information to the first relay device, the first request information being used to inquire about sidelink power control information of the first relay device or to inquire about the sidelink path loss of the first relay device; receiving first information from the first relay device, the first information indicating whether the first relay device performs sidelink power control based on the sidelink path loss or indicating the first path loss; 24. The method of claim 22 or 23, further comprising:

25. The method comprises: sending second request information to the second relay device, the second request information being used to inquire about sidelink power control information of the second relay device or to inquire about the sidelink path loss of the second relay device; receiving second information from the second relay device, the second information indicating whether the second relay device performs sidelink power control based on the sidelink pathloss or indicating the second pathloss; The method of any one of claims 22 to 24, further comprising:

26. transmitting the measurement report corresponding to the measurement event to the network device, sending the measurement report to the network device if the measurement result of the first relay device is smaller than a second threshold and / or the sidelink path loss between the remote device and the first relay device is larger than a third threshold, wherein the first relay device is the serving relay device of the remote device.

26. The method according to any one of claims 21 to 25, comprising:

27. The method comprises: skipping transmitting the measurement report if the measurement result of the first relay device is greater than the second threshold and / or the sidelink path loss between the remote device and the first relay device is less than the third threshold, wherein the first relay device is the serving relay device of the remote device.

27. The method of any one of claims 21 to 26, further comprising:

28. The method comprises: if the measurement result of the first relay device is smaller than a second threshold and / or the sidelink path loss between the remote device and the first relay device is larger than a third threshold, initiating measurements on the candidate relay devices for the remote device, wherein the first relay device is the serving relay device of the remote device.

26. The method of any one of claims 21 to 25, further comprising:

29. The method comprises: skipping measuring the candidate relay devices for the remote device if the measurement result of the first relay device is greater than the second threshold and / or the sidelink path loss between the remote device and the first relay device is less than the third threshold, wherein the first relay device is the serving relay device for the remote device.

29. The method of any one of claims 21 to 25 or claim 28, further comprising:

30. The measurement configuration information includes: Whether to report sidelink path loss, the first threshold value, which is used by the remote device to determine a sidelink path loss indicated by the measurement report; the second threshold value, the second threshold value corresponding to the measurement result of the first relay device, the second threshold value being used by the remote device to determine whether to send the measurement report, or the second threshold value being used by the remote device to determine the first offset of the measurement event, or the second threshold value being used by the remote device to determine whether to measure the candidate relay device, the first relay device being the serving relay device of the remote device; or the third threshold, the third threshold being a sidelink path loss threshold, the third threshold being used by the remote device to determine whether to transmit the measurement report, or to determine whether to measure the candidate relay device, or to determine the first offset for the measurement event; The method of any one of claims 21 to 29, further used to configure one or more of:

31. 1. A communication method applied to a network device, the method comprising: sending measurement configuration information to a remote device, the measurement configuration information including a measurement event; receiving a measurement report from the remote device, the measurement report including a measurement result corresponding to at least one measurement event within the measurement events; Including, The measurement configuration information includes the following measurement events: the event that the SL-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a first offset; the event that the SD-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a second offset; The event that the SL-RSRP of the candidate relay device is better than the SD-RSRP of the serving relay device by a third offset; or The event that the SD-RSRP of the candidate relay device is better than the SL-RSRP of the serving relay device by a fourth offset. and a step including any one or more of the steps:

32. the measurement report further indicates a first path loss and / or a second path loss; or the first measurement indicates a first path loss and / or a second path loss; the first path loss is a sidelink path loss between the remote device and a first relay device, the second path loss is a sidelink path loss between the remote device and a second relay device, the first relay device is a serving relay device of the remote device, and the second relay device is a candidate relay device of the remote device; 32. The method of claim 31.

33. The step of indicating a first path loss includes: including the first path loss value; or including a step of including a second indication, the second indication indicating a range to which the first path loss value belongs or indicating whether the value of the first path loss is greater than a first threshold.

33. The method of claim 32.

34. The measurement configuration information includes: Whether to report sidelink path loss, the first threshold value, which is used by the remote device to determine a sidelink path loss indicated by the measurement report; a second threshold value corresponding to a measurement result of the first relay device, the second threshold value being used by the remote device to determine whether to send the measurement report, or to determine the first offset of the measurement event, or to determine whether to measure the candidate relay device, the first relay device being the serving relay device of the remote device; or a third threshold, the third threshold being a sidelink path loss threshold, the third threshold being used by the remote device to determine whether to transmit the measurement report, or to determine whether to measure the candidate relay device, or to determine the first offset for the measurement event; The method of any one of claims 31 to 33, further used to configure one or more of:

35. 1. A communication method applied to a remote device, the method comprising: receiving configuration information, the configuration information including at least one parameter used to configure a first resource pool, the at least one parameter including a first parameter, the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and a network device; if the remote device is out of coverage, ignoring the first parameter, or ignoring the at least one parameter, or assuming that the first parameter is not configured or provided, or disabling the first parameter, or disabling the sidelink power control performed based on the path loss between the remote device and the network device. A method comprising:

36. The step of receiving the configuration information includes: receiving the configuration information from the network device via an intermediate device; or receiving the configuration information from an intermediate device; the relay device is a serving relay device of the remote device; 36. The method of claim 35.

37. 37. The method of claim 35 or 36, wherein the configuration information is included in a system message or in an RRC message.

38. 1. A communication method applied to a remote device, the method comprising: transmitting a first indication, the first indication indicating that the remote device is out of coverage; receiving first configuration information, the first configuration information including at least one parameter used to configure a first resource pool, the at least one parameter not including a first parameter, the first parameter being used by the remote device to perform sidelink power control based on a path loss between the remote device and a network device; A method comprising:

39. The step of transmitting the first instruction information includes: sending the first indication information to the network device via an intermediate device; or transmitting the first instruction information to a relay device; the relay device is a serving relay device of the remote device; 39. The method of claim 38.

40. The method of claim 38 or 39, wherein the first indication information is included in a radio resource control (RRC) message, a sidelink user equipment information (SUI), a PC5-RRC message, a PC5-signaling (S) message, or a discovery message.

41. 1. A communication method applied to a network device, the method comprising: receiving a first indication from a remote device via a relay device, the first indication indicating that the remote device is out of coverage; transmitting first configuration information, the first configuration information including at least one parameter used to configure a first resource pool, the at least one parameter not including a first parameter, the first parameter being used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device; A method comprising:

42. 1. A communication method applied to a relay device, the method comprising: receiving a first indication from a remote device, the first indication indicating that the remote device is out of coverage; receiving second configuration information from a network device, the second configuration information including at least one parameter used to configure a first resource pool for the remote device, the at least one parameter including a first parameter, the first parameter used by the remote device to perform sidelink power control based on a path loss between the remote device and the network device; sending first configuration information to the remote device, the first configuration information including a parameter other than the first parameter among the at least one parameter, or ignoring the second configuration information; A method comprising:

43. The method comprises: removing the first parameter included in the second configuration information to obtain the first configuration information; 43. The method of claim 42, further comprising:

44. A communications device comprising a processor and a memory, the memory coupled to the processor, the processor configured to perform the method of any one of claims 1 to 13, the method of any one of claims 14 to 20, the method of any one of claims 21 to 30, the method of any one of claims 31 to 34, the method of any one of claims 35 to 37, the method of any one of claims 38 to 40, the method of claim 41, or the method of claim 42 or 43.

45. 1. A computer readable storage medium configured to store a computer program which, when run on a computer, enables the computer to perform the method of any one of claims 1 to 13, the method of any one of claims 14 to 20, the method of any one of claims 21 to 30, the method of any one of claims 31 to 34, the method of any one of claims 35 to 37, the method of any one of claims 38 to 40, the method of claim 41, or the method of claim 42 or 43.

46. A chip system, comprising: a processor and an interface, the processor being configured to call instructions via the interface and to execute the instructions, and execution of the instructions by the processor implementing the method of any one of claims 1 to 13, the method of any one of claims 14 to 20, the method of any one of claims 21 to 30, the method of any one of claims 31 to 34, the method of any one of claims 35 to 37, the method of any one of claims 38 to 40, the method of claim 41, or the method of claim 42 or 43; Chip system.

47. 10. A computer program product comprising a computer program which, when run on a computer, enables the computer to carry out the method of any one of claims 1 to 13, the method of any one of claims 14 to 20, the method of any one of claims 21 to 30, the method of any one of claims 31 to 34, the method of any one of claims 35 to 37, the method of any one of claims 38 to 40, the method of claim 41, or the method of claim 42 or 43.

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