Communication method and device

Abstract

This application provides a communication method and apparatus for reducing energy consumption of a UE, and relates to the field of wireless communication technology. In the method, a terminal device may receive reference signal configuration information and information about an area configured for the terminal device from an access network device. The terminal device may transmit a reference signal in the area based on the reference signal configuration information. Based on the above solution, the terminal device may transmit a reference signal in the area based on the reference signal configuration information, so that the terminal device does not need to access a network to reconfigure a reference signal every time the terminal device moves to a new cell, thereby reducing the energy consumption of the terminal device.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to PCT International Patent Application No. PCT / CN2020 / 139785, entitled "COMMUNATION METHOD AND APPARATUS," filed with the State Intellectual Property Office of China on December 27, 2020, the entire contents of which are incorporated by reference. This application claims priority to Chinese Patent Application No. 202110057999.3, entitled "COMMUNICATION METHOD AND APPARATUS," filed with the State Intellectual Property Office of China on January 15, 2021, the entire contents of which are incorporated by reference.

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

[0003] Positioning service is one of the key functions in new radio (NR) systems. In the current positioning service, user equipment (UE) needs to be in a connected state, or receive reference signal configuration information configured for the UE by a serving cell when in a connected state, and transmit reference signals to the serving cell when in a connected state.

[0004] If a UE that does not currently have a data service but only transmits reference signals to perform positioning services maintains a connected state, the UE's energy consumption will be wasted. Therefore, the UE may be released to an unconnected state to transmit reference signals. When a UE transmits a reference signal in an unconnected state, if the UE moves from a serving cell to a target cell, the reference signal configured for the UE by the serving cell may conflict with the uplink resources of the target cell. As a result, interference may occur in data transmission in the target cell, and UE positioning may fail. However, if the UE accesses the target cell and the target cell reconfigures the reference signal for the UE every time the UE moves from the serving cell to the target cell, the UE needs to initiate access frequently, resulting in high UE energy consumption. Summary of the Invention

[0005] This application provides a communication method and apparatus for reducing energy consumption of a UE.

[0006] According to a first aspect, there is provided a communication method. The method may be performed by a terminal device provided in an embodiment of this application, or may be performed by a chip having similar functions to those of the terminal device. In the method, the terminal device may receive reference signal configuration information and information about an area configured for the terminal device from an access network device. The terminal device may transmit a reference signal in the area based on the reference signal configuration information.

[0007] Based on the above solution, the terminal device may transmit a reference signal within the area based on the reference signal configuration information, so that the terminal device does not need to access the network to reconfigure the reference signal every time the terminal device moves to a new cell, thereby reducing the energy consumption of the terminal device. Furthermore, because the reference signal configuration information can be used within the area, interference caused by collision between the reference signal transmitted when the terminal device is in an unconnected state, i.e., the reference signal transmitted when the terminal device moves to a new cell and the signal in the new cell, can also be avoided.

[0008] In a possible implementation, the information about the area may comprise an identifier of the area, or may comprise information about at least one cell, for example a list of at least one cell.

[0009] Based on the above solution, the terminal device may use information about at least one cell or an identifier of the area to determine whether the cell in which the terminal device is located is within the area, so that the terminal device does not need to reconfigure the reference signal when moving to a new cell.

[0010] In a possible implementation, the terminal device may determine whether the cell in which the terminal device is located is within the area, and if the terminal device determines that the cell in which the terminal device is located is within the area, the terminal device may transmit a reference signal based on the reference signal configuration information.

[0011] Based on the above solution, when the cell in which the terminal device is located belongs to an area, the terminal device may transmit a reference signal based on the reference signal configuration information. When the terminal device moves within the area, the terminal device does not need to access the network to reconfigure the reference signal, which can reduce the energy of the terminal device.

[0012] In a possible implementation, the terminal device may determine whether the cell in which the terminal device is located is within the area. If the terminal device determines that the cell in which the terminal device is located is not within the area, the terminal device may send a second message to the LMF. Here, the second message may be used to notify the LMF that the terminal device has moved out of the area, or the second message may be used to request that reference signal configuration information be updated.

[0013] Based on the above solution, the terminal device may receive reference signal configuration information again when it moves out of the area, which can avoid transmitting reference signals by using the previously configured reference signal configuration information, and can avoid collision and interference between the transmitted reference signals and signals in the new cell.

[0014] In a possible implementation, the terminal device may further receive information regarding time from the access network device. After receiving the information regarding time, the terminal device may start timing. When the timing duration does not exceed the time, the terminal device may transmit a reference signal based on the reference signal configuration information. When the timing duration exceeds the time, the terminal device may send a second message to the LMF. Here, the second message may be used to notify the LMF that the timing has ended, or the second message may be used to request that the reference signal configuration information be updated.

[0015] Based on the above solution, the terminal device may determine whether to transmit a reference signal by using the configured reference signal configuration information based on information about time. When the time count does not end, the terminal device may transmit a reference signal based on the configured reference signal configuration information. When the time count ends, the terminal device receives the reference signal configuration information again. The terminal device may access the network to reconfigure the reference signal, thereby avoiding resource burdens on the network caused when the configuration information is used for a long period of time.

[0016] In a possible implementation manner, the terminal device may further receive uplink resource configuration information configured for the terminal device from the access network device. The terminal device may transmit a third message within the area based on the uplink resource configuration information. The third message may be used to transmit uplink data.

[0017] Based on the above solution, when a terminal device needs to transmit uplink data within an area, the terminal device may transmit the uplink data in an unconnected state based on the uplink resource configuration information. When a terminal device needs to transmit a small amount of data to the network, the terminal device may transmit the data based on the uplink resource configuration information, and does not need to transmit data after entering a connected state. This reduces the energy consumption of the terminal device.

[0018] In a possible implementation, the third message may include a cause, and the cause may indicate the type of uplink data.

[0019] Based on the above solution, the terminal device may send uplink data by using a third message and indicate the type of the uplink data, so that the network can process the uplink data based on the cause.

[0020] In a possible implementation, the third message may further include a first identifier, which may identify the LMF.

[0021] Based on the above solution, the terminal device may send uplink data to the LMF by using the first identifier, and may not need to access the network and send uplink data to the LMF in a connected state by using an LPP message, thereby reducing the energy consumption of the terminal device.

[0022] In a possible implementation, the third message may further include a NAS message. The NAS message may include an LPP PDU and a first identifier. The LPP PDU may include an LPP message to be sent to the LMF corresponding to the first identifier.

[0023] Based on the above solution, the terminal device may send uplink data to the LMF in an unconnected state by using an LPP message, and may not need to access the network to send the uplink data, thereby reducing the energy consumption of the terminal device.

[0024] According to a second aspect, a communication method is provided. The method may be performed by an LMF provided in an embodiment of this application, or may be performed by a chip having similar functions to those of the LMF. In the method, the LMF may send a fourth message to an access network device. Here, the fourth message may be used to request the access network device to determine reference signal configuration information for the terminal device, or the fourth message may be used to request reference signal configuration information for the terminal device. The fourth message may include information about an area, and the area may be an area where the terminal device transmits a reference signal.

[0025] Based on the above solution, the LMF may request the access network device to configure a reference signal that can be transmitted within the area for the terminal device, and the terminal device may transmit the reference signal when it moves to a new cell within the area, thereby reducing the energy consumption caused by the terminal device frequently accessing the network.

[0026] In a possible implementation, the information about the area may include an identifier of the area or information about at least one cell.

[0027] Based on the above solution, an area may be identified by an area identifier or information about at least one cell, so that the terminal device can transmit a reference signal within the area based on the configured reference signal configuration information, thereby reducing the energy consumption of the terminal device.

[0028] In a possible implementation, the fourth message may further include information about the time, the duration for which the terminal device transmits the reference signal in the area fills the time.

[0029] Based on the above solution, the terminal device may transmit a reference signal based on the configured reference signal configuration information within a time indicated by the information on time, and when the time expires, the terminal device may access the network to reconfigure the reference signal, thereby avoiding resource burdens on the network caused when the configuration information is used for a long period of time.

[0030] In a possible implementation, the fourth message may further include indication information, which may indicate that a reference signal to be transmitted by the terminal device in an unconnected state is configured, or may indicate that the terminal device has the capability to transmit a reference signal in an unconnected state.

[0031] Based on the above solution, the access network device may configure a reference signal to be transmitted in an unconnected state by using the indication information, and may determine reference signal configuration information for the terminal device.

[0032] In a possible implementation, the LMF may receive reference signal configuration information from an access network device. The reference signal configuration information may include information about reference signals configured by the access network device for the terminal device.

[0033] Based on the above solution, the LMF may learn the reference signal configuration information of the terminal device, determine the reference signals that need to be measured based on the reference signal configuration information, and instruct the access network device to measure the reference signals transmitted by the terminal device.

[0034] In a possible implementation, the LMF may transmit reference signal configuration information to access network devices included in the area.

[0035] Based on the above solution, an access network device in an area may learn the reference signal configuration information of a terminal device, and the access network device may reserve corresponding resources for transmitting reference signals for the terminal device, thereby avoiding collisions and interference between the reference signals transmitted by the terminal device and other signals.

[0036] In a possible implementation, the fourth message may be further used to request the access network device to configure uplink resources for the terminal device, which may be used by the terminal device to transmit uplink data.

[0037] Based on the above solution, the LMF may request the access network device to configure uplink resources available in the area for the terminal device by using the fourth message, so that the terminal device can transmit uplink data on the uplink resources in the area, thereby preventing the terminal device from frequently accessing the network to transmit uplink data and reducing the energy consumption of the terminal device.

[0038] In a possible implementation, the LMF may receive uplink resource configuration information from an access network device. The uplink resource configuration information may include information about uplink resources configured by the access network device for the terminal device.

[0039] Based on the above solution, the LMF may learn the uplink resource configuration information of the terminal device, and the LMF sends the uplink resource configuration information to other access network devices.

[0040] In a possible implementation, the LMF may send uplink resource configuration information to access network devices within the area.

[0041] Based on the above solution, an access network device within the area may reserve uplink resources indicated by the uplink resource configuration information for a terminal device, and the access network device within the area may receive uplink data transmitted by the terminal device on the resources.

[0042] According to a third aspect, there is provided a communication method. The method may be performed by an access network device provided in an embodiment of this application, or may be performed by a chip having similar functions to those of the access network device. In the method, the access network device may receive a fourth message from the LMF. Here, the fourth message may be used to request the access network device to determine reference signal configuration information for the terminal device, or the fourth message may be used to request reference signal configuration information for the terminal device. The access network device may transmit, to the terminal device, the reference signal configuration information configured for the terminal device and information about an area. The area may be an area where the terminal device transmits a reference signal.

[0043] Based on the above solution, the access network device may configure an area for transmitting reference signals for the terminal device, so that the terminal device can transmit the reference signals within the area, and the terminal device does not need to access the network when moving to a new cell within the area, thereby reducing the energy consumption of the terminal device.

[0044] In a possible implementation, the fourth message may include information about the area.

[0045] Based on the above solution, information about the area may be determined by the LMF and sent to the access network device, and the LMF may determine the area in which the terminal device transmits the reference signal.

[0046] In a possible implementation, the information about the area may include an identifier of the area or may include information about at least one cell.

[0047] Based on the above solution, an area may be identified by an area identifier or information about at least one cell, so that the terminal device can transmit a reference signal within the area based on the configured reference signal configuration information, thereby reducing the energy consumption of the terminal device.

[0048] In a possible implementation manner, the access network device may further transmit information about the time to the terminal device, and the duration for which the terminal device transmits the reference signal in the area may fill the time.

[0049] Based on the above solution, the terminal device may transmit a reference signal based on the configured reference signal configuration information within a time indicated by the information on time, and when the time expires, the terminal device may access the network to reconfigure the reference signal, thereby avoiding resource burdens on the network caused when the configuration information is used for a long period of time.

[0050] In a possible implementation manner, the access network device may further send a first identifier to the terminal device. The first identifier may identify the LMF.

[0051] Based on the above solution, the terminal device may send uplink data to the LMF based on the first identifier, and may not need to access the network and send the uplink data to the LMF in a connected state, thereby reducing the energy consumption of the terminal device.

[0052] In a possible implementation, the fourth message may include indication information, which may indicate that a reference signal to be transmitted by the terminal device in an unconnected state is configured, or may indicate that the terminal device has the capability to transmit a reference signal in an unconnected state.

[0053] Based on the above solution, the access network device may configure a reference signal to be transmitted in an unconnected state by using the indication information, and may determine reference signal configuration information for the terminal device.

[0054] In a possible implementation, the access network device may send reference signal configuration information to the LMF. The reference signal configuration information may include a reference signal configured for the terminal device.

[0055] Based on the above solution, the LMF may learn the reference signal configuration information of the terminal device, determine the reference signals that need to be measured based on the reference signal configuration information, and instruct the access network device to measure the reference signals transmitted by the terminal device.

[0056] In a possible implementation, the access network device may transmit reference signal configuration information to access network devices in the area.

[0057] Based on the above solution, an access network device in an area may learn the reference signal configuration information of a terminal device, and the access network device may reserve corresponding resources for transmitting reference signals for the terminal device, thereby avoiding collisions and interference between the reference signals transmitted by the terminal device and other signals.

[0058] In a possible implementation manner, the access network device may further send uplink resource configuration information of the terminal device to the terminal device, which may be used by the terminal device to transmit uplink data within the area.

[0059] Based on the above solution, when a terminal device needs to transmit uplink data within an area, the terminal device may transmit the uplink data in an unconnected state based on the uplink resource configuration information. When a terminal device needs to transmit a small amount of data to the network, the terminal device may transmit the data based on the uplink resource configuration information, and does not need to transmit data after entering a connected state. This reduces the energy consumption of the terminal device.

[0060] In a possible implementation, the access network device may send uplink resource configuration information to the LMF.

[0061] Based on the above solution, the LMF may learn the uplink resource configuration information of the terminal device, and the LMF sends the uplink resource configuration information to other access network devices.

[0062] In a possible implementation, the access network device may transmit uplink resource configuration information to access network devices in the area.

[0063] Based on the above solution, an access network device within the area may reserve uplink resources indicated by the uplink resource configuration information for a terminal device, and the access network device within the area may receive uplink data transmitted by the terminal device on the resources.

[0064] According to a fourth aspect, a communication method is provided. The method may be performed by a terminal device provided in the embodiments of this application, or may be performed by a chip having similar functions to those of the terminal device. In the method, the terminal device may receive a fifth message from an access network device. The fifth message may include uplink resource configuration information of the terminal device and information about an area. The terminal device may transmit a sixth message within the area based on the uplink resource configuration information. The sixth message may be used to transmit uplink data.

[0065] Based on the above solution, the terminal device may transmit uplink data in an unconnected state within the area based on the uplink resource configuration information, which can avoid the energy consumption caused by the terminal device accessing the network when the terminal device needs to transmit data to the network, and can reduce the energy consumption of the terminal device.

[0066] In a possible implementation, the information about the area may comprise an identifier of the area, or may comprise information about at least one cell, for example a list of at least one cell.

[0067] Based on the above solution, the terminal device may use information about at least one cell or an identifier of the area to determine whether the cell in which the terminal device is located is within the area, so that the terminal device does not need to reconfigure the reference signal when moving to a new cell.

[0068] In a possible implementation manner, the terminal device may determine whether the cell in which the terminal device is located is within the area, and if the terminal device determines that the cell in which the terminal device is located is within the area, the terminal device may send a sixth message based on the uplink resource configuration information.

[0069] Based on the above solution, when the cell in which the terminal device is located belongs to an area, the terminal device may transmit uplink data based on uplink resource configuration information. When the terminal device moves within the area, the terminal device does not need to access the network to reconfigure the uplink resource, which can reduce the energy consumption of the terminal device.

[0070] In a possible implementation, the terminal device may determine whether the cell in which the terminal device is located is within the area. If the terminal device determines that the cell in which the terminal device is located is not within the area, the terminal device may send a seventh message to the LMF. The seventh message may be used to notify the LMF that the terminal device has moved out of the area, or the seventh message may be used to request that uplink resource configuration information be updated.

[0071] Based on the above solution, the terminal device may receive the uplink resource configuration information again when it moves out of the area, which can avoid transmitting uplink data by using the previously configured uplink resource configuration information, and can avoid collision and interference between the transmitted uplink data and signals in the new cell.

[0072] In a possible implementation, the fifth message may further include information about time. After receiving the fifth message, the terminal device may start timing. When the timing duration does not exceed the time, the terminal device may send a sixth message based on the uplink resource configuration information. When the timing duration exceeds the time, the terminal device may send a seventh message to the LMF. Here, the seventh message may be used to notify the LMF that timing has ended, or may be used to request updating of the reference signal configuration information.

[0073] Based on the above solution, the terminal device may determine whether to transmit uplink resources by using the configured uplink resource configuration information based on information about time. When the time count does not expire, the terminal device may transmit uplink data based on the configured uplink resource configuration information. When the time count expires, the terminal device receives the uplink resource configuration information again. This can avoid resource burdens caused to the network when the configuration information is used for a long period of time.

[0074] In a possible implementation, the sixth message may include a cause, which may indicate the type of uplink data.

[0075] Based on the above solution, the terminal device may send uplink data by using a sixth message and indicate the type of the uplink data, so that the network can process the uplink data based on the cause.

[0076] In a possible implementation, the sixth message may further include a first identifier. The first identifier may identify the LMF.

[0077] Based on the above solution, the terminal device may send uplink data to the LMF by using the first identifier, and may not need to access the network and send uplink data to the LMF in a connected state by using an LPP message, thereby reducing the energy consumption of the terminal device.

[0078] In a possible implementation, the sixth message may further include a NAS message. The NAS message may include an LPP PDU and a first identifier. The LPP PDU may include an LPP message to be sent to the LMF corresponding to the first identifier.

[0079] Based on the above solution, the terminal device may send uplink data to the LMF in an unconnected state by using an LPP message, and may not need to access the network to send the uplink data, thereby reducing the energy consumption of the terminal device.

[0080] According to a fifth aspect, a communication method is provided. The method may be performed by an LMF provided in an embodiment of this application, or may be performed by a chip having similar functions to those of the LMF. In the method, the LMF may send an eighth message to an access network device. The eighth message may be used to request the access network device to configure uplink resources for a terminal device. The eighth message may include information about an area, and the area may be an area where the terminal device transmits uplink data.

[0081] Based on the above solution, the LMF may request the access network device to configure uplink resources that can be used to transmit uplink data within the area for the terminal device, and when the terminal device moves to a new cell within the area, the terminal device may transmit the uplink data by using the uplink resources, and thereby transmit reference signals, thereby reducing the energy consumption caused by the terminal device frequently accessing the network.

[0082] In a possible implementation, the information about the area may include an identifier of the area or information about at least one cell.

[0083] Based on the above solution, the area may be identified by an area identifier or information about at least one cell, so that the terminal device can transmit uplink data within the area based on the configured uplink resource configuration information, thereby reducing the energy consumption of the terminal device.

[0084] In a possible implementation manner, the eighth message may further include information about time, where the duration for which the terminal device transmits uplink data in the area according to the uplink resource fills the time.

[0085] Based on the above solution, the terminal device may transmit a reference signal based on the configured uplink resource configuration information within a time indicated by the information about time, and when the time expires, the terminal device may access the network to reconfigure the reference signal, thereby avoiding the resource burden caused to the network when the configuration information is used for a long period of time.

[0086] In a possible implementation manner, the eighth message may further include indication information, which may indicate configuring uplink resources for transmitting uplink data by the terminal device in an unconnected state, or may indicate that the terminal device has the ability to transmit uplink data in an unconnected state.

[0087] Based on the above solution, the access network device may configure uplink resources for transmitting uplink data in an unconnected state by using the indication information, and may determine uplink resource configuration information for the terminal device.

[0088] In a possible implementation, the LMF may receive uplink resource configuration information from an access network device. The uplink resource configuration information may include information about uplink resources configured by the access network device for the terminal device.

[0089] Based on the above solution, the LMF may learn the uplink resource configuration information of the terminal device, and the LMF sends the uplink resource configuration information to other access network devices.

[0090] In a possible implementation, the LMF may send uplink resource configuration information to access network devices within the area.

[0091] Based on the above solution, an access network device within the area may reserve uplink resources indicated by the uplink resource configuration information for a terminal device, and the access network device within the area may receive uplink data transmitted by the terminal device on the resources.

[0092] According to a sixth aspect, there is provided a communication method. The method may be performed by an access network device provided in the embodiments of this application, or may be performed by a chip having similar functions to those of the access network device. In the method, the access network device may receive an eighth message from the LMF. The access network device may send a fifth message to the terminal device. The fifth message may include uplink resource configuration information of the terminal device and information about an area. The area may be an area to which the terminal device transmits uplink data based on the uplink resource configuration information.

[0093] Based on the above solution, the access network device may configure an area for transmitting uplink data for the terminal device, so that the terminal device can transmit the uplink data within the area, and the terminal device does not need to access the network when moving to a new cell within the area, thereby reducing the energy consumption of the terminal device.

[0094] In a possible implementation, the eighth message may include information about the area.

[0095] Based on the above solution, information about the area may be determined by the LMF and sent to the access network device, and the LMF may determine the area in which the terminal device transmits the reference signal.

[0096] In a possible implementation, the information about the area may include an identifier of the area or may include information about at least one cell.

[0097] Based on the above solution, an area may be identified by an area identifier or information about at least one cell, so that the terminal device can transmit a reference signal within the area based on the configured reference signal configuration information, thereby reducing the energy consumption of the terminal device.

[0098] In a possible implementation manner, the fifth message may further include information about time. The duration for which the terminal device transmits uplink data in the area based on the uplink resource configuration information may fill the time.

[0099] Based on the above solution, the terminal device may transmit uplink data based on the configured uplink resource configuration information within the time indicated by the information about time. When the time expires, the terminal device may access the network to reconfigure the reference signal, thereby avoiding resource burdens on the network caused when the configuration information is used for a long period of time.

[0100] In a possible implementation, the fifth message may further include a first identifier, which may identify the LMF.

[0101] Based on the above solution, the terminal device may send uplink data to the LMF based on the first identifier, and may not need to access the network and send the uplink data to the LMF in a connected state, thereby reducing the energy consumption of the terminal device.

[0102] In a possible implementation manner, the eighth message may include indication information, which may indicate configuring uplink resources for transmitting uplink data by the terminal device in an unconnected state, or may indicate that the terminal device has the ability to transmit uplink data in an unconnected state.

[0103] Based on the above solution, the access network device may configure uplink resources for transmitting uplink data in an unconnected state by using the indication information, and may determine uplink resource configuration information for the terminal device.

[0104] In a possible implementation, the access network device may send uplink resource configuration information to the LMF.

[0105] Based on the above solution, the LMF may learn the uplink resource configuration information of the terminal device, and the LMF sends the uplink resource configuration information to other access network devices.

[0106] In a possible implementation, the access network device may transmit uplink resource configuration information to access network devices in the area.

[0107] Based on the above solution, an access network device within the area may reserve uplink resources indicated by the uplink resource configuration information for a terminal device, and the access network device within the area may receive uplink data transmitted by the terminal device on the resources.

[0108] According to a seventh aspect, there is provided a communication device. The communication device may include a module / unit configured to perform the first aspect or any one of the possible implementations of the first aspect, or may include a module / unit configured to perform the second aspect or any one of the possible implementations of the second aspect, or may include a module / unit configured to perform the third aspect or any one of the possible implementations of the third aspect, or may include a module / unit configured to perform the fourth aspect or any one of the possible implementations of the fourth aspect, or may include a module / unit configured to perform the fifth aspect or any one of the possible implementations of the fifth aspect, or may include a module / unit configured to perform the sixth aspect or any one of the possible implementations of the sixth aspect. For example, the communication device includes a communication unit and a processing unit.

[0109] For example, when a communication device performs the method of the first aspect or any one of the possible implementation manners of the first aspect, the communication unit is configured to receive, from an access network device, reference signal configuration information configured for the device and information about an area, the processing unit is configured to determine whether the device is within the area, and the communication unit is further configured to transmit a reference signal within the area based on the reference signal configuration information.

[0110] In one design, the information about the area includes an identifier of the area or information about at least one cell.

[0111] In one design, when determining whether the device is within the area, the processing unit is specifically configured to determine whether a cell serving the device is within the area, and when transmitting a reference signal within the area based on the reference signal configuration information, the communication unit is specifically configured to transmit a reference signal based on the reference signal configuration information if the cell serving the device is within the area.

[0112] In one design, when determining whether the device is within the area, the processing unit is specifically configured to determine whether a cell serving the device is within the area. When transmitting a reference signal within the area based on the reference signal configuration information, the communication unit is specifically configured to send a second message to a location management function (LMF) if it determines that the cell serving the device is not within the area. The second message is used to notify the LMF that the device has moved out of the area, or the second message is used to request that the reference signal configuration information be updated.

[0113] In one design, the communication unit is further configured to receive information related to time from the access network device. The processing unit is further configured to start timing after the communication unit receives the information related to time. The communication unit is further configured to transmit a reference signal based on the reference signal configuration information if the timing duration does not exceed the time, or to send a second message to the LMF if the timing duration exceeds the time. The second message is used to notify the LMF that the timing has ended, or the second message is used to request that the reference signal configuration information be updated.

[0114] In one design, the communication unit is further configured to receive uplink resource configuration information configured for the device from the access network device. The processing unit is further configured to determine whether the device is within an area. The communication unit is further configured to transmit a third message within the area based on the uplink resource configuration information. The third message is used to transmit uplink data.

[0115] In one design, the third message includes a cause, which indicates the type of uplink data.

[0116] In one design, the communication unit is further configured to receive a first identifier from the access network device, the first identifier identifying the LMF.

[0117] In one design, the third message further includes a non-access stratum message, the non-access stratum message including a Long Term Evolution Positioning Protocol LPP PDU and the first identifier, and the LPP PDU includes an LPP message to be sent to the LMF corresponding to the first identifier.

[0118] For example, when the communication device performs the method of the second aspect or any one of the possible implementation manners of the second aspect, the processing unit is configured to generate a fourth message. The communication unit is configured to transmit the fourth message to the access network device. The fourth message is used to request the access network device to determine reference signal configuration information for the terminal device, or is used to request reference signal configuration information for the terminal device. The fourth message includes information about an area, where the area is an area where the terminal device transmits a reference signal.

[0119] In one design, the information about the area includes an identifier of the area or information about at least one cell.

[0120] In one design, the fourth message further includes information regarding the time duration during which the terminal device transmits the reference signal in the area fills the time.

[0121] In one design, the fourth message further includes indication information indicating configuring a reference signal to be transmitted by the terminal device in an unconnected state, or indicating that the terminal device has the capability to transmit a reference signal in an unconnected state.

[0122] In one design, the communication unit is further configured to receive reference signal configuration information from the access network device, where the reference signal configuration information includes information regarding reference signals configured by the access network device for the terminal device.

[0123] In one design, the communication unit is further configured to transmit reference signal configuration information to access network devices included in the area.

[0124] In one design, the fourth message is further used to request the access network device to configure uplink resources for the terminal device, the uplink resources being used by the terminal device to transmit uplink data.

[0125] In one design, the communication unit is further configured to receive uplink resource configuration information from the access network device, the uplink resource configuration information including information regarding uplink resources configured by the access network device for the terminal device.

[0126] In one design, the communication unit is further configured to transmit uplink resource configuration information to access network devices in the area.

[0127] For example, when the communication apparatus performs the method of the third aspect or any one of the third aspects, the communication unit is configured to receive a fourth message from the Location Management Function (LMF). The fourth message is used to request an access network device to determine reference signal configuration information for the terminal device, or is used to request reference signal configuration information for the terminal device. The processing unit determines the reference signal configuration information and information about the area of ​​the terminal device. The communication unit is further configured to transmit the reference signal configuration information and the information about the area to the terminal device. The area is an area from which the terminal device transmits a reference signal.

[0128] In one design, the fourth message includes information about the area.

[0129] In one design, the information about the area includes an identifier of the area or information about at least one cell.

[0130] In one design, the communication unit is further configured to transmit information regarding a time, the duration for which the terminal device transmits the reference signal in the area, fills the time.

[0131] In one design, the communication unit is further configured to transmit a first identifier, the first identifier identifying the LMF.

[0132] In one design, the fourth message includes indication information indicating configuring a reference signal to be transmitted by the terminal device in an unconnected state or indicating that the terminal device has the capability to transmit a reference signal in an unconnected state.

[0133] In one design, the communication unit is further configured to send reference signal configuration information to the LMF, where the reference configuration information includes reference signals configured for the terminal device.

[0134] In one design, the communication unit is further configured to transmit reference signal configuration information to access network devices within the area.

[0135] In one design, the communication unit is further configured to transmit uplink resource configuration information for a terminal device, the uplink resource configuration information being used by the terminal device to transmit uplink data within the area.

[0136] In one design, the communication unit is further configured to send uplink resource configuration information to the LMF.

[0137] In one design, the communication unit is further configured to transmit uplink resource configuration information to access network devices in the area.

[0138] For example, when a communication device performs the method of the fourth aspect or any one of the possible implementation manners of the fourth aspect, the communication unit is configured to receive a fifth message from an access network device. The fifth message may include uplink resource configuration information of the device and information about an area. The processing unit is configured to determine whether the device is within the area. The communication unit is further configured to transmit a sixth message within the area based on the uplink resource configuration information. The sixth message may be used to transmit uplink data.

[0139] In one design, the information about the area may include an identifier of the area, or may include information about at least one cell.

[0140] In one design, when determining whether the device is within the area, the processing unit determines whether a cell serving the device is within the area. When transmitting the sixth message within the area based on the uplink resource configuration information, the communication unit is specifically configured to transmit the sixth message based on the uplink resource configuration information if it determines that the cell serving the device is within the area.

[0141] In one design, when determining whether the device is within the area, the processing unit determines whether a cell serving the device is within the area. When sending the sixth message within the area based on the uplink resource configuration information, the communication unit is specifically configured to send a seventh message to the LMF if it determines that a cell serving the terminal device is not within the area. The seventh message may be used to notify the LMF that the device has moved out of the area, or the seventh message may be used to request that the uplink resource configuration information be updated.

[0142] In one design, the fifth message may further include information regarding time. The processing unit is further configured to start timing after the fifth message is received. The communication unit is further configured to send a sixth message based on the uplink resource configuration information when the timing duration does not exceed the time, or the communication unit is further configured to send a seventh message to the LMF when the timing duration exceeds the time. Here, the seventh message may be used to notify the LMF that the timing has ended, or the seventh message may be used to request updating the reference signal configuration information.

[0143] In one design, the sixth message may include a cause, and the cause may indicate a type of uplink data.

[0144] In one design, the sixth message may further include a first identifier, which may identify the LMF.

[0145] In one design, the sixth message may further include an NAS message. The NAS message may include an LPP PDU and the first identifier. The LPP PDU may include an LPP message to be sent to the LMF corresponding to the first identifier.

[0146] For example, when the communication device performs the method of the fifth aspect or any one of the possible implementation manners of the fifth aspect, the processing unit is configured to generate an eighth message. The communication unit is configured to transmit the eighth message to the access network device. The eighth message may be used to request the access network device to configure uplink resources for the terminal device. The eighth message may include information about an area, and the area may be an area where the terminal device transmits uplink data.

[0147] In one design, the information about the area may include an identifier of the area or information about at least one cell.

[0148] In one design, the eighth message may further include information regarding the time, the duration during which the terminal device transmits uplink data in the area based on the uplink resource, fills the time.

[0149] In one design, the eighth message may further include indication information, which may indicate configuring uplink resources for transmitting uplink data by the terminal device in an unconnected state, or which may indicate that the terminal device has the capability to transmit uplink data in an unconnected state.

[0150] In one design, the communication unit is further configured to receive uplink resource configuration information from the access network device. The uplink resource configuration information may include information regarding uplink resources configured by the access network device for the terminal device.

[0151] In one design, the communication unit is further configured to transmit uplink resource configuration information to access network devices in the area.

[0152] For example, when the communication device performs the method of the sixth aspect or any one of the possible implementation manners of the sixth aspect, the communication unit is configured to receive an eighth message from the LMF. The processing unit is configured to determine a fifth message. The communication unit is further configured to send the fifth message to the terminal device. The fifth message may include uplink resource configuration information of the terminal device and information regarding an area. The area may be an area to which the terminal device transmits uplink data based on the uplink resource configuration information.

[0153] In one design, the eighth message may include information about the area.

[0154] In one design, the information about the area may include an identifier of the area, or may include information about at least one cell.

[0155] In one design, the fifth message may further include information regarding a time. A duration for which the terminal device transmits uplink data in the area based on the uplink resource configuration information may fill the time.

[0156] In one design, the fifth message may further include a first identifier, which may identify the LMF.

[0157] In one design, the eighth message may include indication information indicating configuring uplink resources for transmitting uplink data by the terminal device in an unconnected state, or indicating that the terminal device has the capability to transmit uplink data in an unconnected state.

[0158] In one design, the communication unit is further configured to send uplink resource configuration information to the LMF.

[0159] In one design, the communication unit is further configured to transmit uplink resource configuration information to access network devices in the area.

[0160] According to an eighth aspect, there is provided a communications device, the communications device including a processor and a transceiver, the transceiver being configured to perform transmitting and receiving steps of the method of the first aspect or any one of possible implementations of the first aspect, or to perform transmitting and receiving steps of the method of the second aspect or any one of possible implementations of the second aspect, or to perform transmitting and receiving steps of the method of the third aspect or any one of possible implementations of the third aspect, or to perform transmitting and receiving steps of the method of the fourth aspect or any one of possible implementations of the fourth aspect, or to perform transmitting and receiving steps of the method of the fifth aspect or any one of possible implementations of the fifth aspect, or to perform operating steps of the method of the sixth aspect or any one of possible implementations of the sixth aspect. The processor is configured to perform operational steps of the method of the first aspect or any one of the possible implementations of the first aspect, or to perform operational steps of the method of the second aspect or any one of the possible implementations of the second aspect, or to perform operational steps of the method of the third aspect or any one of the possible implementations of the third aspect, or to perform operational steps of the method of the fourth aspect or any one of the possible implementations of the fourth aspect, or to perform operational steps of the method of the fifth aspect or any one of the possible implementations of the fifth aspect, or to perform operational steps of the method of the sixth aspect or any one of the possible implementations of the sixth aspect.

[0161] In a possible implementation, the apparatus further includes a memory configured to store computer-executable instructions that, when executed by the controller, cause the processor to execute the computer-executable instructions in the memory to perform the method in the above aspect by using hardware resources in the controller.

[0162] In possible implementations, the memory may be located internal to the device, or the memory may be located external to the device.

[0163] In a possible implementation, the memory and the processor may be integrated.

[0164] According to a ninth aspect, a communication system is provided. The communication system may include at least one access network device and at least one LMF. The at least one LMF may perform the operations described in the second and fifth aspects, and the at least one access network device may perform the operations described in the third and sixth aspects. For example, the at least one LMF transmits a fourth message to the at least one access network device. The fourth message may be used to request the access network device to determine reference signal configuration information for the terminal device, or the fourth message may be used to request reference signal configuration information for the terminal device. The fourth message may include information about an area. The area is an area where the terminal device transmits a reference signal. The at least one access network device may transmit the reference signal configuration information configured for the terminal device and information about the area to the terminal device.

[0165] According to a tenth aspect, the present application provides a computer-readable storage medium storing instructions that, when executed on a computer, enable the computer to perform the method in the above aspect.

[0166] According to an eleventh aspect, the present application provides a computer program product storing instructions, which, when executed on a computer, enable the computer to perform the method in the above aspect.

[0167] Furthermore, for the beneficial effects of the seventh to eleventh embodiments, refer to the beneficial effects shown in the first to sixth embodiments. [Brief explanation of the drawings]

[0168] [Figure 1] 1 illustrates a communication system according to an embodiment of the present application. [Figure 2] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 3] 1 is a schematic diagram of an area according to an embodiment of the present application. [Figure 4] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 5] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 6] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 7] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 8A] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 8B] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 9] 1 is a schematic diagram of a communication device according to an embodiment of the present application; [Figure 10] 1 is a schematic diagram of a communication device according to an embodiment of the present application; [Figure 11] 1 is a schematic diagram of a terminal device according to an embodiment of the present application; [Figure 12] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. [Figure 13] 1 is an exemplary flowchart of a communication method according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0169] Currently, positioning services are one of the important functions in NR systems. When a caller initiates a positioning service, a location management function (LMF) may request the UE's serving cell to configure a sounding reference signal (SRS) for the UE. The UE is in a connected state when it receives SRS configuration information configured for the UE by the serving cell. The UE may transmit an SRS based on the SRS configuration information, and a measurement base station may measure the SRS transmitted by the UE to obtain a measurement amount and report the measurement amount to the LMF. The LMF may obtain the UE's location through calculations based on the measurement amount and feed the location back to the caller. When a UE is handed over from a serving cell to a destination cell, the UE needs to initiate access to the base station managing the destination cell. When the UE is in a connected state, the UE receives SRS configuration information from the serving cell. That is, in the current positioning service, to realize UE positioning, the UE needs to be in a connected state to receive SRS configuration information.

[0170] However, if a UE that does not have a data service but only transmits an SRS to perform a positioning service maintains a connected state, the UE's energy consumption will be wasted. Therefore, the UE may be released to an unconnected state to transmit an SRS. When a UE transmits an SRS in an unconnected state, if the UE moves from a serving cell to a destination cell, the SRS configured for the UE by the serving cell may conflict with the uplink resources of the destination cell. As a result, interference may be caused to data transmission in the destination cell, and UE positioning may fail. However, if the UE accesses the destination cell and receives SRS configuration information from the destination cell every time the UE moves from the serving cell to the destination cell, the UE needs to initiate access frequently, resulting in high UE energy consumption.

[0171] Furthermore, if the UE wants to send information to the LMF when it is in an unconnected state, it needs to enter a connected state and then send the information to the LMF by using a long term evolution positioning protocol (LPP) message. When the UE needs to send a small amount of information to the LMF, this information transmission method wastes the energy consumption of the UE.

[0172] Based on the above problem, embodiments of this application provide a communication method and device. In the method, a base station may configure information about a reference signal and an area for a UE. The UE may transmit a reference signal within the area based on the reference signal configuration information. Therefore, when a cell handover occurs for the UE, the UE does not need to enter a connected state to receive SRS configuration information, but may transmit an SRS within the area based on the information about the area configured by the base station for the UE, thereby reducing the energy consumption of the UE.

[0173] Hereinafter, some terms in the embodiments of this application will be explained to help those skilled in the art have a better understanding.

[0174] The terms "system" and "network" in the embodiments of this application may be used interchangeably. The term "plurality" means two or more, and similarly for other numbers. The term "and / or" describes an associative relationship for describing related objects and indicates that three relationships may exist. For example, A and / or B may represent the following three cases: the presence of only A, the presence of both A and B, and the presence of only B. Furthermore, the singular forms "a," "an," and "the" refer to "one or more," rather than "one or only one," unless otherwise specified in the context. For example, a "device" refers to one or more such devices. Furthermore, "at least one of" refers to one or any combination of the subsequent related objects. For example, "at least one of A, B, and C" includes A, B, C, AB, AC, BC, or ABC.

[0175] The technical solutions in the embodiments of this application may be applied to a conventional typical network or a future UE-centric network. The embodiments of this application may be applied to various communication systems, for example, a long term evolution (LTE) system, a worldwide interoperability for microwave access (WiMAX) communication system, a future 5th generation (5G) system such as a new radio access technology (NR), and a future communication system such as a 6G system.

[0176] All aspects, embodiments or features are presented in this application by describing a system that may include multiple devices, components, modules, etc. It should be understood that each system may include other devices, components, modules, etc. and / or may not include all of the devices, components, modules, etc. described with reference to the accompanying drawings. Furthermore, combinations of these solutions may also be used.

[0177] The network architectures and service scenarios described in the embodiments of this application are intended to more clearly describe the technical solutions in the embodiments of this application, and do not constitute limitations on the technical solutions provided in the embodiments of this application. Those skilled in the art may learn that with the evolution of network architectures and the emergence of new service scenarios, the technical solutions provided in the embodiments of this application can also be applied to similar technical problems.

[0178] To facilitate understanding of the embodiments of this application, a communication system applicable to the embodiments of this application will first be described in detail by using the communication system shown in FIG. 1 as an example. FIG. 1 is a schematic diagram of a communication system applicable to a communication method according to the embodiments of this application. As shown in FIG. 1, the communication system 100 includes a terminal device 101, an access network device 102, and a core network device 103. The core network device 103 may include an LMF 1031 and an access and mobility management function (AMF) 1032. The LMF 1031 may request the access network device 102 to configure a reference signal for the terminal device 101. The access network device 102 configures information about the reference signal and the area for the terminal device 101, so that the terminal device 101 can transmit the reference signal within the area. The LMF 1031 may select an access network device as a measurement access network device. It should be understood that the measurement access network device may be the access network device 102 or an access network device other than the access network device 102 that is not shown in the drawings. The measurement access network device measures the reference signal transmitted by the terminal device 101 and reports the measurement amount to the LMF 1031. The LMF 1031 may obtain the location information of the UE through calculation based on the measurement amount.

[0179] Each network element in the communication system will be described below.

[0180] The following describes in detail the functions of each network element or device in the communication system in the embodiment of this application.

[0181] A terminal device may also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., and is a device that provides a user with voice and / or data connectivity. For example, a terminal device may be a handheld device or an in-vehicle device with wireless connectivity. Currently, a terminal device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. In FIG. 1, the terminal device is illustrated by using a UE as an example, and the terminal device is not limited thereto.

[0182] An access network (AN) device provides wireless access services to terminal devices. An access network device is a device that enables terminal devices to access a wireless network in a communication system. An access network device is a node in a wireless access network and may also be called a base station or a radio access network (RAN) node (or device). Currently, some examples of access network devices are gNB, transmission reception point (TRP), evolved NodeB (eNB), radio network controller (RNC), NodeB (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB or home NodeB (HNB)), baseband unit (BBU), wireless fidelity (WiFi) access point (AP), etc.

[0183] The access and mobility management function (AMF) may be configured to manage access control and mobility of a terminal device. In practical application, the access and mobility management function includes the mobility management function of a mobility management entity (MME) in a network framework in long term evolution (LTE), and further includes an access management function. Specifically, the access and mobility management function may be responsible for terminal device registration, mobility management, tracking area update procedures, reachability detection, session management function selection, mobility state transition management, etc. For example, in 5G, the access and mobility management function may be an access and mobility management function (AMF), as shown in FIG. 1. In future communications, such as 6G, the access and mobility management function may still be an AMF or may have another name, which is not limited in this application. When the access and mobility management function is an AMF, the AMF may provide Namf services.

[0184] The location management function LMF may be configured to determine the location of the UE, obtain downlink position measurements or position estimates from the UE, etc. For example, in 5G, the location management function (LMF) is shown in Figure 1. In future communication systems, for example, 6G, the location management function may still be the LMF or may have another name, which is not limited in this application.

[0185] 2 is an exemplary flowchart of a communication method according to an embodiment of the present application. The method may include the following steps:

[0186] Step 201: The LMF sends a fourth message to the first access network device.

[0187] Here, the fourth message may be a positioning information request message or a newly defined message. The fourth message may be used to request the first access network device to configure a reference signal for the terminal device, and / or the fourth message may be used to request reference signal configuration information for the terminal device. The reference signal may be a sounding reference signal (SRS). Optionally, the fourth message may further include one or more of Examples 1 to 3.

[0188] Without loss of generality, the following description uses an example in which the reference signal of the terminal device is an SRS. It should be understood that the reference signal in this embodiment of this application may alternatively be a reference signal other than an SRS.

[0189] Example 1: Information about an area

[0190] Here, the area may mean that the terminal device may transmit the configured SRS in the unconnected state within the area, and may not need to enter the connected state and receive SRS configuration information again when moving to another cell. It should be understood that the unconnected state in this embodiment of the present application may include an inactive state and an idle state. For example, if the area includes cell 1, cell 2, and cell 3, the terminal device may transmit the configured SRS in the unconnected state within cell 1, cell 2, and cell 3.

[0191] The area may be determined by the LMF based on a first access network device serving the terminal device. For example, the LMF may determine the first access network device currently serving the terminal device and determine neighboring access network devices of the first access network device. The LMF may determine cells managed by the first access network device and cells managed by neighboring access network devices as one area. Alternatively, the LMF may determine the first access network device currently serving the terminal device and determine all or some access network devices having an Xn interface with the first access network device. The LMF may determine cells managed by the first access network device and cells managed by all or some access network devices having an Xn interface as one area. Alternatively, the LMF may determine a cell in which the terminal device currently serves and obtain neighboring cell information of the cell. The LMF may determine a cell in which the terminal device currently serves and neighboring cells of the cell as one area.

[0192] In one example, the information about the area may be an area identifier. Optionally, the identifier may be associated with a list, and the list may be a cell list. The cell list may include identifiers of one or more cells, and an area may be formed by one or more cells. Alternatively, the identifier may be associated with one piece of geographical location information, for example, one management area, and the area may be formed by the geographical location indicated by the geographical location information. Alternatively, the identifier may be associated with an area covered by at least one access network device. Access network devices within the area may broadcast the same area identifier. The area identifier broadcast by access network devices within the area may be transmitted to the access network device by the LMF, and the access network device may perform the broadcast based on the area identifier transmitted by the LMF. Alternatively, the area identifier may be determined by the access network device. For example, the area identifier may be pre-configured for the access network device by the OAM, and the access network device may perform the broadcast based on the OAM configuration.

[0193] In another example, the information about the area may be a cell list, which may include identifiers of one or more cells, and an area may be formed by one or more cells.

[0194] In this embodiment of the present application, the information about the area may alternatively be other information that can indicate the area, which is not particularly limited in the present application. For example, the information about the area may alternatively be an identifier list of the first access network device, and the area may be formed by cells managed by the first access network device.

[0195] Optionally, each cell may be associated with one piece of frequency information among the information about the area, and the terminal device may determine whether to transmit the SRS within the area based on the frequency information. For example, if a cell not associated with frequency information exists among the cells included in the area, even if the cell not associated with frequency information belongs to the area, when the terminal device is located in the cell not associated with frequency information, the terminal device needs to enter a connected state and request the network side to update the SRS configuration information. Furthermore, when the terminal device is located in a cell, if the cell belongs to the above area and is associated with frequency information, the terminal device may determine whether the frequency of the configured SRS satisfies the frequency information associated with the cell. If the frequency of the configured SRS satisfies the frequency information associated with the cell, the terminal device may transmit the configured SRS within the cell in an unconnected state. If the frequency of the configured SRS does not satisfy the frequency information associated with the cell, the terminal device needs to enter a connected state and request the network side to update the SRS configuration information.

[0196] It should be noted that the information about the area may alternatively be specified in a communication protocol. The LMF may obtain information about a first access network device serving the terminal device or information about a cell in which the terminal device is currently located, and determine the information about the area specified in the communication protocol based on the information about the first access network device or the information about the cell in which the terminal device is currently located.

[0197] Example 2: Time Information

[0198] Here, the time indicated by the information about time may be a time during which the terminal device may transmit an SRS configured in an unconnected state. The information about time may be a duration or a timer. The timer's time duration may be a duration during which the terminal device transmits an SRS configured in an unconnected state. Alternatively, the information about time may be a point in time. For example, the information about time may be one point in time. The point in time indicates that the terminal device may transmit an SRS configured in an unconnected state before the point in time arrives, and that the terminal device cannot continue to transmit an SRS configured in an unconnected state when the point in time arrives. Alternatively, the information about time may be two points in time. The terminal device may transmit an SRS configured in an unconnected state when a first point in time arrives, and the terminal device cannot continue to transmit an SRS configured in an unconnected state when a second point in time arrives.

[0199] It should be understood that the information about time in this embodiment of the present application may alternatively be other information that can indicate time. The time may be met when the terminal device sends the configured SRS in an unconnected state.

[0200] Example 3: First Instruction

[0201] The first indication information may indicate that a reference signal to be transmitted by the terminal device in an unconnected state is to be configured, or the first indication information may indicate that the terminal device has the capability to transmit a reference signal in an unconnected state.

[0202] In one example, the first indication information may trigger the first access network device to release the terminal device to an unconnected state and configure an SRS to be transmitted in the unconnected state for the terminal device. Upon receiving the first indication information, the first access network device may release the terminal device to the unconnected state. The first access network device may configure an SRS to be transmitted in the unconnected state for the terminal device. For example, the first access network device may configure time domain resources and frequency domain resources of the SRS for the terminal device. The first access network device may add the SRS configuration information to a radio resource control (RRC) release message.

[0203] In another example, the first instruction information may trigger the first access network device to configure the terminal device to continue transmitting SRS after the terminal device enters the unconnected state. The first access network device may decide to release the terminal to the unconnected state. For example, when the terminal device does not have data service within a certain time, the first access network device releases the terminal device to the unconnected state. The first access network device may add SRS configuration information to an RRC release message to release the terminal device to the unconnected state and configure the terminal device to continue transmitting SRS. Alternatively, before releasing the terminal device to the unconnected state, the first access network device may send the SRS configuration information to the terminal device by using an RRC message, for example, an RRC reconfiguration message. Furthermore, when the first access network device sends an RRC release message to the terminal device to release the terminal device to the unconnected state, the RRC release message may carry second instruction information, and the second instruction information may instruct the terminal device to continue transmitting SRS in the unconnected state.

[0204] Step 202: The first access network device sends reference signal configuration information and information about the area to the terminal device.

[0205] The first access network device may release the terminal device to the unconnected state based on the first indication information in Example 3. Alternatively, the first access network device may release the terminal device to the unconnected state when the terminal device does not have a data service within a specific time. The first access network device may release the terminal device to the unconnected state by using an RRC release message. Optionally, the RRC release message may carry second indication information, and the second indication information may instruct the terminal device to transmit an SRS in the unconnected state.

[0206] In a possible implementation manner, the first access network device may transmit reference signal configuration information and information about the area to the terminal device by using one message. For example, the first access network device may transmit reference signal configuration information and information about the area to the terminal device by using a first message. In one example, the first message may be an RRC release message. When the first access network device determines that the terminal device needs to be released to an unconnected state, the first access network device transmits the RRC release message to the terminal device. The first access network device may add SRS configuration information and information about the area to the RRC release message.

[0207] In another example, the first message may be an RRC reconfiguration message. The first access network device may add SRS configuration information and information about the area to the RRC reconfiguration message. When determining that the terminal device needs to be released to an unconnected state, the first access network device sends an RRC release message to the terminal device to release the terminal device to an unconnected state.

[0208] Based on the above solution, the first access network device may use a first message to send reference signal configuration information and information about the area to the terminal device, thereby reducing signaling overhead.

[0209] In another possible implementation manner, the first access network device may transmit the reference signal configuration information and the information about the area to the terminal device by using two messages. When the first access network device transmits the reference signal configuration information and the area information to the terminal device by using two messages, the first access network device may simultaneously transmit the message carrying the reference signal configuration information and the message carrying the information about the area, or may transmit the message carrying the reference signal configuration information before the message carrying the information about the area, or may transmit the message carrying the information about the area before the message carrying the reference signal configuration information.

[0210] In one example, the first access network device may send SRS configuration information to the terminal device by using an RRC reconfiguration message. When determining that the terminal device needs to be released to an unconnected state, the first access network device sends an RRC release message to the terminal device, carrying information about the area, to release the terminal device to an unconnected state.

[0211] In another example, when determining that the terminal device needs to be released to an unconnected state, the first access network device sends an RRC release message carrying SRS configuration information to the terminal device to release the terminal device to an unconnected state. The terminal device may also send information about the area to the terminal device by using an RRC reconfiguration message.

[0212] Based on the above solution, the first access network device may separately transmit reference signal configuration information and area-related information to the terminal device, and when the first access network device determines that the terminal device needs the area-related information, the first access network device may transmit the area-related information to the terminal device, which can reduce transmission resources.

[0213] The RRC release message or the RRC reconfiguration message may further include information about the area. The information about the area may be that shown in Example 1, and the details will not be described again here. The information about the area may be determined by the first access network device based on the fourth message from the LMF. For example, if the fourth message sent by the LMF includes information about the area, the first access network device may send the information about the area included in the fourth message to the terminal device.

[0214] Optionally, the information about the area may be determined by the first access network device. For example, the first access network device may determine information about neighboring first access network devices, and may determine a cell managed by the first access network device and a cell managed by the neighboring first access network device as one area. Alternatively, the first access network device may determine information about a cell in which the terminal device currently resides, and may obtain neighboring cell information of the cell and determine the cell and the neighboring cells as one area. The first access network device may use a cell identifier, geographical location information of the cell, etc. as information about the cell.

[0215] It should be noted that the information about the area may be a cell list, an area identifier, or other information that can indicate the area. The relevant description may be that shown in Example 1, and the details will not be described again here.

[0216] Optionally, the RRC release message or the RRC reconfiguration message may further include information related to time as shown in Example 2. The information related to time may be determined based on a fourth message from the LMF. For example, if the fourth message sent by the LMF includes information related to time, the first access network device may transmit the information related to time included in the fourth message to the terminal device. Alternatively, the information related to time may be determined by the first access network device.

[0217] Optionally, the RRC release message may further include a first identifier, where the first identifier may be a routing identifier (routing ID), and the first identifier may identify the LMF.

[0218] In a possible implementation manner, the first access network device may transmit SRS configuration information configured for the terminal device to the LMF. The first access network device may add the SRS configuration information of the terminal device to a positioning information response message. The first access network device may further transmit the SRS configuration information to other first access network devices in the area. Optionally, the SRS configuration information may alternatively be transmitted to other first access network devices by the LMF. After receiving the SRS configuration information from the first access network device, the LMF may transmit the SRS configuration information to other first access network devices in the area. After receiving the SRS configuration information, the other first access network devices in the area may reserve the SRS indicated by the SRS configuration information for the terminal device to avoid scheduling the time domain resources and frequency domain resources indicated by the SRS configuration information for other terminal devices. For example, the time domain resources and frequency domain resources indicated by the SRS configuration information may be reserved for the terminal device. If other first access network devices in the area have configured the time domain resources and frequency domain resources indicated by the SRS configuration information for other terminal devices, the first access network device may retrieve the time domain resources and frequency domain resources configured for the other terminal devices and reserve the time domain resources and frequency domain resources for the terminal device.

[0219] In another possible implementation manner, after receiving the SRS configuration information from the first access network device, the LMF may select a third access network device. Here, the third access network device may be a measurement access network device selected by the LMF and configured to measure the SRS transmitted by the terminal device, such as the above-mentioned first access network device, a second access network device in the above-mentioned area, or another access network device. The third access network device may measure the SRS transmitted by the terminal device. It should be understood that the third access network device may also be the second access network device in the area. The LMF may send measurement request information to the selected third access network device to request the third access network device to measure the SRS transmitted by the terminal device. The measurement request message may carry SRS configuration information of the terminal device. After receiving the measurement request information from the LMF, the third access network device may measure the SRS transmitted by the terminal device and send the measurement result to the LMF. The LMF may determine the location of the terminal device based on the received measurement result to position the terminal device.

[0220] Step 203: The terminal device transmits a reference signal in the area based on the reference signal configuration information.

[0221] Some or all of the access network devices within the area may receive the reference signal transmitted by the terminal device. Alternatively, some or all of the access network devices within the area and neighboring access network devices of some or all of the access network devices may receive the reference signal transmitted by the terminal device. The terminal device may obtain SRS configuration information from an RRC release message or an RRC reconfiguration message from the first access network device. The terminal device may determine time domain resources and frequency domain resources for the SRS based on the SRS configuration information. The terminal device may store at least one of information related to the area and information related to the time. For example, if the RRC release message or the RRC reconfiguration message includes information related to the area, the terminal device may store information related to the area. If the RRC release message or the RRC reconfiguration message includes information related to the time, the terminal device may store information related to the time. If the RRC release message or the RRC reconfiguration message includes information related to the area and information related to the time, the terminal device may store information related to the area and information related to the time.

[0222] In an unconnected state, the terminal device may determine whether to transmit the SRS based on at least one of the information about the area and the information about the time. If the SRS can be transmitted, the terminal device may transmit the SRS on the time domain resource and the frequency domain resource of the SRS.

[0223] In a possible implementation, the terminal device may determine whether the cell in which the terminal device is located belongs to the above-mentioned area. If the cell in which the terminal device is located belongs to the area, the terminal device may transmit SRS in an unconnected state based on the SRS configuration information. In one example, the terminal device may determine whether the cell in which the terminal device is located belongs to the area based on the cell identifier of the cell in which the terminal device is located. For example, the terminal device may demodulate the master information block (MIB) of the cell in which the terminal device is located, obtain the system information block (SIB) in the MIB, read the CGI of the cell in which the terminal device is located from the SIB1, and determine whether the cell in which the terminal device is located belongs to the above-mentioned area based on the read CGI. Alternatively, the terminal device may read the physical cell identifier (PCI) of the cell in which the terminal device is located from the SSB, and determine whether the cell in which the terminal device is located belongs to the above-mentioned area based on the read PCI. Optionally, the terminal device may determine whether the cell in which the terminal device is located belongs to the above area based on the read PCI and the read CGI.

[0224] If the information about the area includes a cell list, the terminal device may search the cell list for a cell identifier of the cell in which the terminal device is located. If the terminal device finds the cell identifier of the cell in which the terminal device is located, the terminal device may consider that the cell in which the terminal device is located belongs to said area. If the terminal device cannot find the cell identifier of the cell in which the terminal device is located in the cell list, the terminal device may consider that the cell in which the terminal device is located does not belong to the area.

[0225] If the information about the area includes an area identifier, the terminal device may determine whether the area identifier broadcast by the cell in which the terminal device is located matches the stored area identifier. If so, the terminal device may consider that the cell in which the terminal device is located belongs to the area. If not, the terminal device may consider that the cell in which the terminal device is located does not belong to the area. The area identifier broadcast by the cell in which the terminal device is located may be an area identifier broadcast by an access network device that manages the cell in which the terminal device is located using a system broadcast message.

[0226] Optionally, the information about the area may include an identifier of the area, and the identifier of the area may be associated with a cell list. The terminal device may determine the cell list associated with the identifier of the area based on the identifier of the area. The terminal device may determine whether the cell in which the terminal device is located belongs to the area based on the cell list and the cell identifier of the cell in which the terminal device is located.

[0227] If the cell in which the terminal device is located does not belong to the area, the terminal device may send a second message to the LMF. The second message may be used to request that the SRS configuration information be updated, or the second message may be used to notify the LMF that the terminal device has moved out of the area. After receiving the second message, the LMF may perform the steps shown in step 201 to update the SRS configuration information for the terminal device.

[0228] In one example, a terminal device may send a non-access stratum (NAS) message to a first access network device. The first access network device may forward the NAS message to an AMF. The NAS message includes a long term evolution positioning protocol (LPP) protocol data unit (PDU) sent by the terminal device to the LMF. The LPP PDU includes an LPP message. It should be noted that the NAS message further includes a first identifier that identifies the LMF. The first identifier may be a routing identifier (routing ID). After receiving the NAS message, the AMF may forward the LPP PDU to the LMF identified by the routing ID based on the routing ID.

[0229] 3, the first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message includes information about the area and at least one of SRS configuration information and second indication information. The information about the area includes a cell list, and the cell list includes cell identifier 1, cell identifier 2, and cell identifier 3. The terminal device 302 is served by cell A. The terminal device 302 may determine time domain resources and frequency domain resources for the SRS based on the SRS configuration information. The terminal device 302 may read the CGI of cell A and determine that the identifier of cell A is cell identifier 1. The terminal device 302 determines that cell A is within the area. Therefore, the terminal device 302 may transmit an SRS in an unconnected state on the time domain resources and frequency domain resources of the SRS. The terminal device 302 moves from cell A to cell B in a moving process. The terminal device 302 may read the CGI of cell B and determine that the identifier of cell B is cell identifier 4. The terminal device 302 may determine that cell B is not in area. Thus, the terminal device 302 may initiate random access and send an LPP message to the LMF to request an update of SRS configuration information or a message to move out of area.

[0230] Optionally, each cell may be associated with one piece of frequency information among the information about the area. After determining that the cell in which the terminal device serves belongs to the area, the terminal device may determine whether the cell in which the terminal device serves is associated with frequency information. If the cell in which the terminal device serves is not associated with frequency information, the terminal device may enter a connected state and request that the SRS configuration information be updated. If the cell in which the terminal device serves is associated with frequency information, the terminal device may determine whether the frequency of the configured SRS satisfies the frequency information associated with the cell in which the terminal device serves. If the frequency of the configured SRS satisfies the frequency information associated with the cell in which the terminal device serves, the terminal device may transmit the SRS in an unconnected state. If the frequency of the configured SRS does not satisfy the frequency information associated with the cell in which the terminal device serves, the terminal device needs to enter a connected state and request the LMF to update the SRS configuration information.

[0231] 3 , the first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message may include information about the area and at least one of SRS configuration information and second indication information. The information about the area includes an identifier of the area, and the identifier of the area is associated with a cell list. The cell list includes cell identifier 1, cell identifier 2, and cell identifier 3. Cell identifier 1 is associated with frequency information f1, cell identifier 2 is associated with frequency information f2, and cell identifier 3 is not associated with frequency information. The terminal device 302 may determine time domain resources and frequency domain resources f1 for the SRS based on the SRS configuration information. The terminal device 302 is served by cell A. The terminal device 302 may read the CGI of cell A and determine that the identifier of cell A is cell identifier 1. The terminal device 302 may determine that the frequency information associated with cell identifier 1 is f1, and the terminal device 302 may determine that cell A is within its area and that the frequency domain resource f1 of the SRS satisfies the frequency information f1 associated with cell A. Therefore, the terminal device 302 may transmit the SRS in an unconnected state on the frequency domain resource f1 and the time domain resource of the SRS.

[0232] In one example, the terminal device 302 moves from cell A to cell B in a movement process. The terminal device 302 may read the CGI of cell B and determine that the identifier of cell B is cell identifier 2. The terminal device 302 may determine that cell B is within the area. The terminal device 302 may further determine that frequency information associated with cell identifier 2 is f2. The terminal device 302 may determine that the frequency domain resource f1 of the SRS does not satisfy the frequency information f2 associated with cell identifier 2. Therefore, the terminal device 302 may initiate random access and send an LPP message to the LMF to request updating of SRS configuration information or a message for moving out of the area.

[0233] In another example, the terminal device 302 moves from cell A to cell C in a movement process. The terminal device 302 may read the CGI of cell C and determine that the identifier of cell C is cell identifier 3. The terminal device 302 may determine that cell identifier 3 is not associated with frequency information. Therefore, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that SRS configuration information be updated, or may indicate that the terminal device has moved out of range.

[0234] Optionally, the information about the area may include an identifier of the area. See FIG. 3 . The terminal device 302 may store the identifier of the area. The terminal device 302 may be located in cell A, and may receive the identifier of the area broadcast by the access network device that manages cell A. If the terminal device 302 determines that the identifier of the area is the same as the identifier stored in the terminal device 302, the terminal device 302 may determine that cell A is within the area. Therefore, the terminal device 302 may transmit an SRS in an unconnected state on the time-frequency resource of the SRS. The terminal device 302 moves from cell A to cell B in a mobility process. The terminal device 302 may receive the identifier of the area broadcast by the access network device that manages cell B. If the terminal device 302 determines that the identifier of the area is different from the identifier stored in the terminal device 302, the terminal device 302 may determine that cell B is not within the area. Thus, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the SRS configuration information be updated or to indicate that the terminal device has moved out of range.

[0235] Optionally, the RRC release message may further include information about time as shown in Example 2. The terminal device may start timing after receiving the RRC release message, and when the timing duration exceeds the above time, the terminal device may send an LPP message to the LMF. The LPP message may be used to notify the LMF that timing has ended, or to request that SRS configuration information be updated.

[0236] Refer to FIG. 3. The first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message may include a timer, information about the area, and at least one of SRS configuration information and second indication information. The timer's time duration is t1. The terminal device 302 may start the timer after receiving the RRC release message. The terminal device 302 is serving cell A. The terminal device 302 may determine that cell A is within the area and that the timer has not yet reached the specified time duration t1. Therefore, the terminal device 302 may transmit an SRS in an unconnected state on the frequency domain resource f1 and the time domain resource of the SRS. For a method for the terminal device 302 to determine whether cell A is within the area, please refer to the relevant description in the above embodiment. Details will not be described again here. The terminal device 302 moves from cell A to cell C in a movement process, and the terminal device 302 may determine that cell C is within the area. However, because the terminal device 302 determines that the timer has reached the specified duration t1, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the SRS configuration information be updated or may indicate that the timer has expired.

[0237] The communication method provided in this application will be described below with reference to specific embodiments.

[0238] 4 is an exemplary flowchart of a communication method according to an embodiment of the present application. The method may include the following steps:

[0239] Step 401: The LMF sends a positioning information request to a first access network device.

[0240] The positioning information request may include information about an area and / or a timer. The information about the area may be as shown in Example 1. For the timer, refer to the information about the time shown in Example 2. Here, the first access network device may be an access network device providing a service to the terminal device. Furthermore, the positioning information request may also include first indication information. The first indication information may indicate that the terminal device has the capability to transmit an SRS in an unconnected state, or may indicate that a reference signal to be transmitted by the terminal device in an unconnected state is to be configured.

[0241] Step 402: The first access network device determines the SRS configuration information of the terminal device.

[0242] The first access network device may release the terminal device to an unconnected state. For example, the first access network device may determine to release the terminal device to an unconnected state when the terminal device does not have data service within a certain time. Alternatively, the first access network device may release the terminal device to an unconnected state based on the first indication information. It should be understood that the first access network device may release the terminal device to an unconnected state in step 403.

[0243] Step 403: The first access network device sends an RRC release message to the terminal device.

[0244] Here, the RRC release message may include information about the area and / or the timer. Optionally, the RRC release message may further include at least one of a routing ID, second indication information, and SRS configuration information. For descriptions of the routing ID and the second indication information, please refer to the related descriptions in the embodiment of the method shown in FIG. 2.

[0245] It should be noted that if the RRC release message carries the second indication information, after step 402 and before step 403, the first access network device may send SRS configuration information to the terminal device by using an RRC message, for example, may send the SRS configuration information to the terminal device by using an RRC reconfiguration message.

[0246] Step 404: The first access network device sends a positioning information response to the LMF.

[0247] The positioning information response may include SRS configuration information of the terminal device. It should be understood that there is no fixed order between step 403 and step 404. The first access network device may perform step 403 before step 404, or may perform step 404 before step 403, or may perform step 403 and step 404 simultaneously.

[0248] Step 405a: The LMF sends the SRS configuration information to a second access network device in the area.

[0249] Step 405b: The first access network device sends the SRS configuration information to a second access network device in the area.

[0250] It should be noted that only one of step 405a and step 405b may be performed, for example, step 405a may be performed, or step 405b may be performed.

[0251] Step 406: The LMF selects a third access network device and sends a measurement request to the third access network device.

[0252] Here, the third access network device may be a measurement access network device selected by the LMF and configured to measure the SRS transmitted by the terminal device, for example, may be the above-mentioned first access network device, may be a second access network device in the above-mentioned area, or may be another access network device. The measurement request may include SRS configuration information of the terminal device.

[0253] In one design, the LMF may simultaneously perform step 405a and step 406. For example, the LMF may send SRS configuration information to a second access network device in the area by using a measurement request message without independently performing 405a.

[0254] Step 407: The terminal device transmits the SRS at an SRS transmission period based on the SRS configuration information.

[0255] The terminal device may determine whether the cell in which the terminal device is located has exceeded the area and / or whether the timer has expired, and may transmit an SRS at an SRS transmission period when the cell in which the terminal device is located has not exceeded the area and / or the timer has not expired.

[0256] The terminal device may transmit the SRS on the frequency domain resource for the SRS in an SRS transmission period based on the SRS configuration information.

[0257] Step 408: The third access network device measures the SRS sent by the terminal device, and sends a measurement response to the LMF.

[0258] Here, the third access network device may be a measurement access network device selected by the LMF and configured to measure the SRS transmitted by the terminal device, for example, the first access network device mentioned above, a second access network device in the area mentioned above, or another access network device.

[0259] The measurement response may carry measurement results of the SRS, such as the signal to interference plus noise ratio (SINR), the reference signal receiving power (RSRP) and / or the reference signal receiving quality (RSRQ), or the relative time of arrival (RTOA) or angle of arrival (AOA) of the SRS.

[0260] Step 409: The LMF obtains the location information of the terminal device through processing based on the measurement result.

[0261] The LMF may calculate the location information by using an uplink angle of arrival (UL-AOA) positioning technique or an uplink time difference of arrival (UL-TDOA) positioning technique. It should be noted that the LMF may alternatively determine the location information of the terminal device by using other positioning techniques, which are not particularly limited in this application.

[0262] Optionally, the terminal device may perform step 410a if the cell in which the terminal device is serving has moved beyond its coverage area and / or if the timer expires.

[0263] Step 410a: The terminal device sends an LPP message to the LMF.

[0264] The terminal device may use an LPP message to indicate to the LMF that the terminal device has moved out of the coverage area, or may request that SRS configuration information be updated, or may indicate that a timer has expired. The terminal device may initiate random access and send an RRC message to a fourth access network device in which the terminal device is located. Here, the RRC message may include a NAS message sent to the AMF and a routing ID. The NAS message may include an LPP PDU. The LPP PDU includes the LPP message sent to the LMF. The AMF may forward the LPP message included in the LPP PDU to the corresponding LMF based on the routing ID. The LPP message may be used to request that SRS configuration information for the terminal device be updated, or may indicate that the terminal device has moved out of the coverage area, or may indicate that a timer has expired.

[0265] In a possible implementation, after receiving the LPP message, the LMF may send a message to some or all of the access network devices in the above area to instruct the access network devices to release SRS resources, or to indicate that resources do not need to be reserved for the terminal device. Optionally, the message may include SRS configuration information. The SRS resources indicated by the SRS configuration information may be SRS resources that need to be released or SRS resources that do not need to be reserved for the terminal device.

[0266] After receiving the LPP message, the LMF may return to execute step 401. Based on this, steps 401 to 410a may be repeated, so that the terminal device transmits SRS in an unconnected state within the area.

[0267] In step 410a, the terminal device requests the LMF to update the SRS configuration information and / or the information about the area. Optionally, the terminal device may alternatively request the fourth access network device to update the SRS configuration information and / or the information about the area. The terminal device and the access network device may perform steps 410b to 413.

[0268] Step 410b: The terminal device initiates random access and sends an RRC message to a fourth access network device in which the terminal device serves, where the message is used to request the fourth access network device to update SRS configuration information and / or information related to the area. Optionally, the RRC message may further include a cause, and the cause may indicate a request to update the SRS configuration information and / or information related to the area. Optionally, the RRC message may further include a routing ID.

[0269] Step 411: The fourth access network device may determine SRS configuration information and / or information about the area for the terminal device.

[0270] Optionally, the fourth access network device may further determine a timer for the terminal device. For a method for determining SRS configuration information and / or information about the area by the fourth access network device, refer to the related descriptions in step 402 and step 403. Optionally, for a method for determining a timer by the fourth access network device, refer to the related descriptions in step 402 and step 403. Details will not be described again here.

[0271] Step 412: The fourth access network device sends SRS configuration information to the LMF.

[0272] For example, the fourth access network device may send the SRS configuration information to the LMF by using a positioning information update message, or may send the SRS configuration information to the LMF by using other messages, which are not particularly limited in this application.

[0273] Step 413: The fourth access network device sends the SRS configuration information to the terminal device.

[0274] The fourth access network device may further send information about the area and / or the timer to the terminal device. For a method for sending SRS configuration information to the terminal device by the fourth access network device, please refer to the related descriptions in step 402 and step 403. For a method for sending information about the area and / or the timer to the terminal device by the fourth access network device, please refer to the related descriptions in step 402 and step 403. The details will not be described again here.

[0275] It should be noted that step 412 may be performed before step 413, or step 413 may be performed before step 412, or step 413 and step 412 may be performed simultaneously, which is not particularly limited in this application.

[0276] Based on steps 401 to 409 and steps 410b to 413, the terminal device may also transmit an SRS in an unconnected state within the area. In the embodiment shown in Fig. 4, information about the area is determined by the LMF and transmitted to the first access network device. It should be understood that in this embodiment of the present application, all steps shown in Fig. 4 may be performed to configure a complete embodiment, or those skilled in the art may select and perform some steps from the steps shown in Fig. 4.

[0277] 5 is an exemplary flowchart of a communication method according to an embodiment of the present application. The method may include the following steps:

[0278] Step 501: The LMF sends a positioning information request to a first access network device.

[0279] Wherein, the first access network device may be an access network device serving the terminal device. Further, the positioning information request may include first indication information. The first indication information may indicate that the terminal device has the capability to transmit SRS in an unconnected state, or the first indication information may indicate that a reference signal to be transmitted by the terminal device in an unconnected state is configured.

[0280] Step 502: The first access network device determines information about the area, and determines SRS configuration information of the terminal device.

[0281] The first access network device may release the terminal device to an unconnected state. For example, the first access network device may determine to release the terminal device to an unconnected state when the terminal device does not have data service within a certain time. Alternatively, the first access network device may release the terminal device to an unconnected state based on the first indication information. It should be understood that the first access network device may release the terminal device to an unconnected state in step 503.

[0282] Step 503: The first access network device sends an RRC release message to the terminal device.

[0283] Here, the RRC release message may include information about the area and / or the timer. The information about the area and the timer may be determined by the first access network device. For details, please refer to the related description in the embodiment of the method shown in FIG. 2. The details will not be described again here. Optionally, the RRC release message may further include at least one of a routing ID, second indication information, and SRS configuration information. For descriptions of the routing ID and the second indication information, please refer to the related description in the embodiment of the method shown in FIG. 2.

[0284] It should be noted that if the RRC release message carries the second indication information, after step 502 and before step 503, the first access network device may send SRS configuration information to the terminal device by using an RRC message, for example, may send the SRS configuration information to the terminal device by using an RRC reconfiguration message.

[0285] Step 504: The first access network device sends a positioning information response to the LMF.

[0286] The positioning information response may include SRS configuration information of the terminal device and information about the area. Here, for the information about the area, refer to Example 1. The information about the area is determined by the first access network device. It should be understood that there is no fixed order between step 503 and step 504. The first access network device may perform step 503 before step 504, or may perform step 504 before step 503, or may perform step 503 and step 504 simultaneously.

[0287] Step 505a: The LMF sends the SRS configuration information to a second access network device in the area.

[0288] Step 505b: The first access network device sends the SRS configuration information to a second access network device in the area.

[0289] It should be noted that only one of step 405a and step 405b may be executed. For example, step 505a may be executed, or step 505b may be executed. When step 505a is executed, the positioning information response in step 504 includes SRS configuration information and at least one of information related to the area and information related to the time. When step 505b is executed, the positioning information response in step 504 includes SRS configuration information.

[0290] Steps 506 to 510a may be the same as steps 406 to 410a shown in FIG.

[0291] Based on this, steps 501 to 510a may be repeated, so that the terminal device transmits SRS in the area in an unconnected state.

[0292] In step 510a, the terminal device requests the LMF to update the SRS configuration information and / or the information about the area. Optionally, the terminal device may alternatively request the fourth access network device in which the terminal device is located to update the SRS configuration information and / or the information about the area. The terminal device and the fourth access network device may perform steps 510b to 513.

[0293] Steps 510b and 511 may be the same as steps 410b and 411 shown in FIG.

[0294] Step 512: The fourth access network device sends SRS configuration information to the LMF.

[0295] For example, the fourth access network device may send the SRS configuration information to the LMF by using a positioning information update message, or may send the SRS configuration information to the LMF by using another message. This is not particularly limited in this application. Optionally, the fourth access network device may further send information related to the area and / or the timer to the LMF. For a method for sending the SRS configuration information to the LMF by the fourth access network device, refer to steps 504, 505a, and 505b shown in FIG. 5. For a method for optionally sending the information related to the area and / or the timer to the LMF by the fourth access network device, refer to steps 504, 505a, and 505b shown in FIG. 5. Details will not be described again here.

[0296] Step 513: The fourth access network device sends the SRS configuration information to the terminal device.

[0297] The fourth access network device may further send information about the area and / or the timer to the terminal device. For a method for sending SRS configuration information to the terminal device by the fourth access network device, please refer to the related descriptions in steps 502 and 503. For a method for sending information about the area and / or the timer to the terminal device by the fourth access network device, please refer to the related descriptions in steps 502 and 503. The details will not be described again here.

[0298] It should be noted that step 512 may be performed before step 513, or step 513 may be performed before step 512, or step 513 and step 512 may be performed simultaneously, which is not particularly limited in this application.

[0299] Based on this, in steps 501 to 509 and steps 510b to 513, the terminal device may transmit an SRS in an unconnected state within the area. In the embodiment shown in Fig. 5, the information about the area and the time duration of the timer are determined by the first access network device. It should be understood that in this embodiment of the present application, all steps shown in Fig. 5 may be performed to configure a complete embodiment, or a person skilled in the art may select and perform some steps from the steps shown in Fig. 5.

[0300] In this embodiment of the present application, the first access network device may further configure uplink resources for the terminal device, and the terminal device may transmit uplink data to the LMF in an unconnected state on the uplink resources within the area. The following provides explanations and descriptions by using the accompanying drawings.

[0301] 6 is an exemplary flowchart of a communication method according to an embodiment of the present application. The method may include the following steps:

[0302] Step 601: The LMF sends a fourth message to the first access network device.

[0303] Here, the fourth message may be a positioning information request message or a newly defined message. The fourth message may be used to request the first access network device to configure an SRS for the terminal device, or the fourth message may be used to request reference signal configuration information for the terminal device. Optionally, the fourth message may further include one or more of Examples 1 to 3.

[0304] Example 1: Information about an area

[0305] Here, the area may mean that a terminal device may transmit uplink data in an unconnected state within the area by using the configured PUR, and may not need to enter a connected state and receive PUR configuration information again when moving to another cell. Here, the unconnected state may include an inactive state and an idle state. For example, if the area includes cell 1, cell 2, and cell 3, the terminal device may transmit uplink data in an unconnected state using the PURs configured in cell 1, cell 2, and cell 3.

[0306] The area may be determined by the LMF based on the first access network device serving the terminal device. For related descriptions, please refer to the description of determining the area by the LMF in the embodiment of the method shown in Figure 2. Furthermore, for information about the area, please refer to the related descriptions in Example 1 shown in Figure 2. The details will not be described again here.

[0307] Optionally, each cell may be associated with one piece of frequency information in the information about the area, and the terminal device may determine whether to transmit uplink data on the PUR configured in the area based on the frequency information. For example, if a cell not associated with frequency information exists in the cells included in the area, even if the cell not associated with frequency information belongs to the area, when the terminal device is located in the cell not associated with frequency information, the terminal device needs to enter a connected state and request the network side to update the PUR configuration information. Furthermore, when the terminal device is located in a cell, if the cell belongs to the above area and is associated with frequency information, the terminal device may determine whether the frequency of the configured PUR satisfies the frequency information associated with the cell. If the frequency of the configured PUR satisfies the frequency information associated with the cell, the terminal device may transmit uplink resources on the PUR in an unconnected state. If the frequency of the configured PUR does not satisfy the frequency information associated with the cell, the terminal device needs to enter a connected state and request the network side to update the PUR configuration information.

[0308] It should be noted that the information about the area may alternatively be specified in a communication protocol. The LMF may obtain information about a first access network device serving the terminal device or information about a cell in which the terminal device is currently located, and determine the information about the area specified in the communication protocol based on the information about the first access network device or the information about the cell in which the terminal device is currently located.

[0309] Example 2: Time Information

[0310] Here, the time indicated by the information about time may be a time when the terminal device may transmit uplink data in an unconnected state on the configured PUR. For a related description of the information about time, refer to Example 2 shown in Figure 2. Details will not be described again here.

[0311] Example 3: Third Instruction

[0312] The third indication information may indicate that the terminal device configures a preconfigured uplink resource (PUR) to be used when transmitting uplink data in an unconnected state, or the third indication information may indicate that the terminal device has the capability to transmit uplink data in an unconnected state on a PUR.

[0313] Optionally, the third indication information may be used to trigger the first access network device to release the terminal device to an unconnected state. Upon receiving the third indication information, the first access network device may release the terminal device to an unconnected state. The first access network device may configure a PUR for the terminal device to be used to transmit uplink data in the unconnected state. The first access network device may add the PUR configuration information to a first message and send the first message to the terminal device. The first message may be an RRC release message.

[0314] Optionally, the third indication information and the above first indication information may be the same indication information or may be represented by the same information element.

[0315] Step 602: A first access network device sends a first message to a terminal device.

[0316] The first message may be an RRC release message. The message may include PUR configuration information. Optionally, the message may further include other information, such as area-related information, time-related information, and SRS configuration information. For details, please refer to the related description in the embodiment of the method shown in Figure 2. To avoid repetition, the details will not be described again here.

[0317] In a possible implementation, the first access network device may further send the PUR configuration information to a second access network device in the area.

[0318] Optionally, the first access network device may send the PUR configuration information configured for the terminal device to the LMF, and the LMF may send the PUR configuration information to a second access network device in the area. The first access network device may add the PUR configuration information of the terminal device to a positioning information response message.

[0319] After receiving the PUR configuration information, a second access network device in the area may reserve the time domain resources and frequency domain resources indicated by the PUR configuration information for the terminal device, and avoid scheduling the time domain resources and frequency domain resources indicated by the PUR configuration information for other terminal devices. If the second access network device in the area configures the time domain resources and frequency domain resources indicated by the PUR configuration information for other terminal devices, the second access network device may reclaim the time domain resources and frequency domain resources configured for the other terminal devices and reserve the time domain resources and frequency domain resources for the terminal device.

[0320] Step 603: The terminal device sends a third message to the PUR in the area.

[0321] Here, the third message may be an RRC message. The RRC message may be used to transmit uplink data to the first access network device, or the RRC message may be used to transmit uplink data to the LMF. Optionally, the RRC message may include a cause, and the cause may indicate a type of uplink data, for example, positioning data, NAS data, or terminal-initiated data (mo-data). The RRC message may further include a NAS container used to carry a NAS message transmitted to the AMF. The NAS message may include an LPP PDU and a routing ID, and the LPP PDU includes an LPP message transmitted by the terminal device to the LMF. The AMF may forward the LPP message in the LPP PDU to a corresponding LMF based on the routing ID.

[0322] The terminal device may acquire PUR configuration information from a first message from the first access network device. The terminal device may determine time domain resources and frequency domain resources for PUR based on the PUR configuration information. Optionally, the terminal device may determine an area where uplink data can be transmitted in an unconnected state based on information about the area.

[0323] The terminal device may determine whether the cell in which the terminal device is located belongs to the area. If the cell in which the terminal device is located belongs to the area, the terminal device may transmit uplink data in an unconnected state based on the PUR configuration information.

[0324] Referring to FIG. 3 , the first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message includes PUR configuration information and information about the area. The information about the area includes a cell list, which includes cell identifier 1, cell identifier 2, and cell identifier 3. The terminal device 302 is served by cell A. The terminal device 302 may determine time domain resources and frequency domain resources for transmitting uplink data based on the PUR configuration information. The terminal device 302 may read the CGI of cell A and determine that the identifier of cell A is cell identifier 1. The terminal device 302 determines that cell A is within the area. Therefore, the terminal device 302 may transmit uplink data via the LMF in an unconnected state over PUR. The terminal device 302 moves from cell A to cell B in a mobility process. The terminal device 302 may read the CGI of cell B and determine that the identifier of cell B is cell identifier 4. The terminal device 302 may determine that cell B is not in range. Thus, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the PUR configuration information be updated or to indicate that the terminal device has moved out of range.

[0325] In a possible implementation, each cell may be associated with one frequency information. After determining that the cell in which the terminal device serves belongs to the area, the terminal device may determine whether uplink data can be transmitted over the PUR in the cell in which the terminal device serves in an unconnected state based on the information about the area and the frequency information. See FIG. 3. The first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message may include PUR configuration information and information about the area. The information about the area includes an area identifier, and the area identifier is associated with a cell list. The cell list includes cell identifier 1, cell identifier 2, and cell identifier 3. Cell identifier 1 is associated with frequency information f1, cell identifier 2 is associated with frequency information f2, and cell identifier 3 is not associated with frequency information. The terminal device 302 may determine time domain resources and frequency domain resources f1 for the PUR based on the PUR configuration information. The terminal device 302 serves in cell A. The terminal device 302 may read the CGI of cell A and determine that the identifier of cell A is cell identifier 1. The terminal device 302 may determine that frequency information associated with cell identifier 1 is f1, and the terminal device 302 may determine that cell A is within its area and that the frequency domain resource f1 of the PUR satisfies the frequency information f1 associated with cell A. Therefore, the terminal device 302 may transmit uplink data in an unconnected state on the frequency domain resource f1 and the time domain resource.

[0326] In one example, the terminal device 302 moves from cell A to cell B in a movement process. The terminal device 302 may read the CGI of cell B and determine that the identifier of cell B is cell identifier 2. The terminal device 302 may determine that cell B is within the area. The terminal device 302 may further determine that frequency information associated with cell identifier 2 is f2. The terminal device 302 may determine that the frequency domain resource f1 of the PUR does not satisfy the frequency information f2 associated with cell identifier 2. Therefore, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the PUR configuration information be updated, or may indicate that the terminal device has moved out of the area.

[0327] In another example, the terminal device 302 moves from cell A to cell C in a movement process. The terminal device 302 may read the CGI of cell C and determine that the identifier of cell C is cell identifier 3. The terminal device 302 may determine that cell identifier 3 is not associated with frequency information. Therefore, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the PUR configuration information be updated or to indicate that the terminal device has moved out of range.

[0328] Optionally, the information about the area may be an area identifier. See FIG. 3 . The terminal device 302 may store the area identifier. The terminal device 302 may be located in cell A, and may receive the area identifier broadcast by the access network device managing cell A. If the terminal device 302 determines that the area identifier is the same as the identifier stored in the terminal device 302, the terminal device 302 may determine that cell A is within the area. Therefore, the terminal device 302 may transmit uplink data in an unconnected state on the time-frequency resource of the configured PUR. The terminal device 302 moves from cell A to cell B in a mobility process. The terminal device 302 may receive the area identifier broadcast by the access network device managing cell B. If the terminal device 302 determines that the area identifier is different from the identifier stored in the terminal device 302, the terminal device 302 may determine that cell B is not within the area. Thus, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the PUR configuration information be updated or to indicate that the terminal device has moved out of range.

[0329] In another possible example, the RRC release message may further include information about time. The terminal device may start timing after receiving the RRC release message, and when the timing duration exceeds the above time, the terminal device may send an LPP message to the LMF. The LPP message may be used to notify the LMF that timing has ended or to request updating of PUR configuration information. See FIG. 3. The first access network device 301 sends an RRC release message to the terminal device 302 to release the terminal device 302 to an unconnected state. The RRC release message may include SRS configuration information, a timer, and information about the area. The timer's timing duration is t1. The terminal device 302 may start the timer after receiving the RRC release message. The terminal device 302 is serving cell A. When the terminal device 302 determines that cell A is within its area and the timer's timing duration has not reached t1, the terminal device 302 may transmit uplink data in an unconnected state using the configured PUR. The terminal device 302 may move from cell A to cell C in a movement process, and the terminal device 302 may determine that cell C is within the area. However, because the terminal device 302 determines that the timer has reached the specified duration t1, the terminal device 302 may initiate random access and send an LPP message to the LMF to request that the PUR configuration information be updated, or may indicate that the terminal device has moved out of the area, or may indicate that the timer has expired.

[0330] The communication method provided in this application will be described below with reference to specific embodiments.

[0331] 7 is an exemplary flowchart of a communication method according to an embodiment of the present application. The method may include the following steps:

[0332] Step 701: The LMF sends a positioning information request to a first access network device.

[0333] If the information about the area and / or the timer is determined by the LMF, the location information request may include information about the area and / or the timer. For the information about the area, see the related description in Example 1. For the information about the timer, see the related description of the information about the time in Example 2. Here, the first access network device may be an access network device providing a service to the terminal device. Furthermore, the positioning information request may also include third indication information, which may indicate configuring PUR for the terminal device. Optionally, the third indication information may further have the function of the above-mentioned first indication information. For example, the third indication information may indicate configuring PUR for the terminal device and configuring SRS to be transmitted in an unconnected state for the terminal device.

[0334] Step 702: The first access network device determines SRS configuration information and PUR configuration information of the terminal device.

[0335] The first access network device may configure, for the terminal device, an SRS to be transmitted in an unconnected state based on the third indication information or the first indication information, and may configure, for the terminal device, a PUR to be used when the terminal device transmits uplink data in an unconnected state based on the third indication information. Optionally, the first access network device may decide to release the terminal device to the unconnected state. For example, the first access network device may determine to release the terminal device to the unconnected state when the terminal device does not have a data service within a specific time. Alternatively, the first access network device may release the terminal device to the unconnected state based on the third indication information or the first indication information. It should be understood that the first access network device may release the terminal device to the unconnected state in step 703.

[0336] Step 703: The first access network device sends an RRC release message to the terminal device.

[0337] Here, the RRC release message may include PUR configuration information and at least one of information related to the area and the timer. Optionally, the RRC release message may further include a routing ID, SRS configuration information, and second indication information. The information related to the area and the timer may be configured by the first access network device or may be sent to the first access network device by the LMF. For descriptions of the routing ID and the second indication information, please refer to the related descriptions in the embodiment of the method shown in FIG. 2.

[0338] It should be noted that if the RRC release message carries the second indication information, after step 702 and before step 703, the first access network device may send SRS configuration information to the terminal device by using an RRC message, for example, may send the SRS configuration information to the terminal device by using an RRC reconfiguration message.

[0339] Step 704: The first access network device sends a positioning information response to the LMF.

[0340] The positioning information response may include SRS configuration information of the terminal device. Optionally, the positioning information response may further include PUR configuration information. It should be understood that there is no fixed order between step 703 and step 704. The first access network device may perform step 703 before step 704, or may perform step 704 before step 703, or may perform step 703 and step 704 simultaneously.

[0341] Step 705a: The LMF sends the SRS configuration information and / or the PUR configuration information to a second access network device in the area.

[0342] In one example, it is assumed that the information regarding the timer and / or area is determined by the LMF. In this case, if the LMF sends SRS configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information. If the LMF sends SRS configuration information and PUR configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information and the PUR configuration information. If the LMF sends PUR configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information and the PUR configuration information. The SRS configuration information is used by the LMF when the LMF initiates a measurement request.

[0343] In another example, it is assumed that the information regarding the timer and / or area is determined by the first access network device. In this case, if the LMF sends SRS configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information and at least one of the information regarding the timer and the area determined by the first access network device. If the LMF sends SRS configuration information and PUR configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information, the PUR configuration information, and at least one of the information regarding the timer and the area determined by the first access network device. If the LMF sends PUR configuration information to the second access network device in step 705a, the positioning information response in step 704 may include the SRS configuration information, the PUR configuration information, and at least one of the information regarding the timer and the area determined by the first access network device.

[0344] Step 705b: The first access network device sends the SRS configuration information and / or the PUR configuration information to a second access network device in the area.

[0345] In one example, it is assumed that the information regarding the timer and / or area is determined by the LMF. In this case, if the LMF sends SRS configuration information to the second access network device in step 705b, the LMF sends PUR configuration information to the second access network device in step 705a. The positioning information response in step 704 may include SRS configuration information and PUR configuration information. The SRS configuration information is used when the LMF sends a measurement request. If the first access network device sends SRS configuration information and PUR configuration information to the second access network device in step 705b, step 705a may not be executed. The positioning information response in step 704 may include SRS configuration information. The SRS configuration information is used when the LMF sends a measurement request. If the first access network device sends PUR configuration information to the second access network device in step 705b, the LMF sends SRS configuration information to the second access network device in step 705a. The positioning information response in step 704 may include SRS configuration information.

[0346] In another example, it is assumed that the information on the timer and / or area is determined by the first access network device. In this case, if the first access network device sends SRS configuration information to the second access network device in step 705b, the LMF sends PUR configuration information to the second access network device in step 705a. The positioning information response in step 704 may include information on the timer and / or area determined by the first access network device, the SRS configuration information, and the PUR configuration information. The SRS configuration information is used when the LMF sends a measurement request. If the first access network device sends SRS configuration information and PUR configuration information to the second access network device in step 705b, step 705a may not be executed. The positioning information response in step 704 may include information on the timer and / or area determined by the first access network device and the SRS configuration information. The SRS configuration information is used when the LMF sends a measurement request. In step 705b, if the first access network device sends PUR configuration information to the second access network device, in step 705a, the LMF sends SRS configuration information to the second access network device. The positioning information response in step 704 may include information about the timer and / or area determined by the first access network device and the SRS configuration information.

[0347] Step 706: The LMF selects a third access network device and sends a measurement request to the third access network device.

[0348] Here, the third access network device may be a measurement access network device selected by the LMF and configured to measure the SRS transmitted by the terminal device, for example, may be the above-mentioned first access network device, may be a second access network device in the above-mentioned area, or may be another access network device. The measurement request may include SRS configuration information of the terminal device.

[0349] In one design, the LMF may simultaneously perform step 705a and step 706. The LMF may send SRS configuration information and / or PUR configuration information to second access network devices in the area by using a measurement request message.

[0350] Step 707: The terminal device transmits the SRS based on the SRS configuration information.

[0351] The terminal device may determine whether the cell in which the terminal device is located exceeds the area and / or whether the timer has expired, and may transmit an SRS at an SRS transmission period based on the SRS configuration information when the cell in which the terminal device is located does not exceed the area and / or when the timer has not expired.

[0352] Step 708: The terminal device sends an RRC message on the PUR.

[0353] When the terminal device needs to transmit uplink data, the terminal device may determine whether the cell in which the terminal device serves has exceeded the coverage area and / or whether the timer has expired. When the cell in which the terminal device serves has not exceeded the coverage area and / or the timer has not expired, the terminal device may transmit an RRC message. Here, the RRC message includes an NAS message. Optionally, the RRC message may further include a cause. The NAS message includes an LPP PDU and a routing ID. The LPP PDU includes an LPP message to be sent to the LMF. The LPP message includes uplink data. The first access network device may forward the NAS message to the AMF, and the AMF may forward the LPP message included in the LPP PDU to the LMF based on the routing ID. The cause may indicate the type of uplink data. For related descriptions, refer to the embodiment shown in FIG. 6. Details will not be described again here.

[0354] It should be noted that step 708 may be executed after step 703, and the execution order of step 708 and other steps after step 703 is not limited.

[0355] Step 709: The third access network device measures the SRS sent by the terminal device, and sends a measurement response to the LMF.

[0356] The measurement response may carry measurement results of the SRS, such as the signal to interference plus noise ratio (SINR), the reference signal receiving power (RSRP) and / or the reference signal receiving quality (RSRQ), or the relative time of arrival (RTOA) or angle of arrival (AOA) of the SRS.

[0357] Step 710: The LMF obtains location information of the terminal device through processing based on the measurement results and uplink data.

[0358] The LMF may calculate the location information by using an uplink angle of arrival (UL-AOA) positioning technique or an uplink time difference of arrival (UL-TDOA) positioning technique. It should be understood that the LMF may alternatively calculate the location information of the terminal device by using other positioning techniques. This is not particularly limited in this application. It should be understood that in this embodiment of this application, all steps shown in FIG. 7 may be executed to constitute a complete embodiment, or a person skilled in the art may select and execute some steps from the steps shown in FIG. 7.

[0359] 8A and 8B are exemplary flowcharts of a communication method according to an embodiment of the present application. The method may include the following steps:

[0360] Steps 801 to 810 may be the same as steps 701 to 710 shown in FIG.

[0361] Optionally, the terminal device may perform step 811a when the cell in which the terminal device is located has moved beyond its coverage area and / or when the timer expires.

[0362] Step 811a: The terminal device sends an LPP message to the LMF.

[0363] The terminal device may use an LPP message to indicate to the LMF that the terminal device has moved out of the coverage area, or may indicate that a timer has expired, or may request that SRS configuration information or PUR configuration information be updated. The terminal device may initiate random access and send an RRC message to a fourth access network device in which the terminal device is located. Here, the RRC message may include a NAS message and a routing ID sent to the AMF. The NAS message may include an LPP PDU. The LPP PDU includes the LPP message sent to the LMF. The AMF may forward the LPP message in the LPP PDU to the corresponding LMF based on the routing ID.

[0364] In some embodiments, after receiving the LPP message, the LMF may send a message to some or all of the access network devices in the above area to instruct the access network devices to release SRS resources or to indicate that no resources need to be reserved for the terminal device. Optionally, the message may include SRS configuration information. The SRS resources indicated by the SRS configuration information may be SRS resources that need to be released or SRS resources that do not need to be reserved for the terminal device.

[0365] After receiving the LPP message, the LMF may return to perform step 801. Based on this, steps 801 to 811a may be repeated, so that the terminal device transmits SRS and uplink data in an unconnected state within the area.

[0366] In step 811a, the terminal device requests the LMF to update at least one of SRS configuration information, PUR configuration information, and information related to the area. Optionally, the terminal device may alternatively request the fourth access network device to update at least one of SRS configuration information, PUR configuration information, and information related to the area. The terminal device and the access network device may perform steps 811b to 814.

[0367] Step 811b: The terminal device initiates random access and sends an RRC message to a fourth access network device in which the terminal device serves, requesting the fourth access network device to update at least one of SRS configuration information, PUR configuration information, and area-related information. Optionally, the RRC message may further include a cause, and the cause may indicate a request to update at least one of SRS configuration information, PUR configuration information, and area-related information. Optionally, the RRC message may further include a routing ID.

[0368] Step 812: The fourth access network device may determine at least one of SRS configuration information, PUR configuration information, information about the area, and a timer for the terminal device.

[0369] For a method for determining at least one of the SRS configuration information, the PUR configuration information, the information about the area, and the timer by the fourth access network device, please refer to the relevant description in step 702 and step 703 shown in Figure 7. The details will not be described again here.

[0370] Step 813: The fourth access network device sends SRS configuration information to the LMF.

[0371] For example, the fourth access network device may send the SRS configuration information to the LMF by using a positioning information update message, or may send the SRS configuration information to the LMF by using another message. This is not particularly limited in this application. Optionally, the above message may be further used to send PUR configuration information and / or information related to the area to the LMF. When the fourth access network device sends at least one of the SRS configuration information, the PUR configuration information, and information related to the area to the LMF by using the above message, refer to step 704, step 705a, and step 705b shown in FIG. 7. The details will not be described again here.

[0372] Step 814: The fourth access network device sends at least one of SRS configuration information, PUR configuration information, information about the area, and a timer to the terminal device.

[0373] For a method for the fourth access network device to send at least one of the SRS configuration information, the PUR configuration information, the area-related information, and the timer to the terminal device, please refer to the relevant description of step 702 and step 703 shown in Figure 7. The details will not be described again here.

[0374] It should be noted that step 813 may be performed before step 814, or step 814 may be performed before step 813, or step 813 and step 814 may be performed simultaneously, which is not particularly limited in this application.

[0375] Based on this, the terminal device may transmit SRS and uplink data in an unconnected state within the area in steps 801 to 810 and steps 811b to 814. It should be understood that in this embodiment of the present application, all steps shown in Figures 8A and 8B may be executed to configure a complete embodiment, or those skilled in the art may select and execute some steps from the steps shown in Figures 8A and 8B. This application further provides an embodiment of a communication method for realizing positioning. An example flowchart of the embodiment is shown in Figure 12, which may include the following steps: Step 1201: The terminal is in an unconnected state, and the terminal device determines whether the cell in which the terminal device is located has changed. For example, the terminal device detects the SSB to obtain the physical cell identifier PCI of the cell, and / or detects the SIB1 to obtain the cell global identifier CGI of the cell. If the cell detected by the terminal is different from the previous PCI, this may be considered to be a cell change. Alternatively, if the CGI detected by the terminal is different from the previous CGI, this may also be considered to be a cell change. If the terminal device determines that the cell has not changed, step 1202 is performed. If the terminal device determines that the cell has changed, for example, if the terminal performs cell reselection or detects that the cell ID of the cell in which the terminal is located has changed, the terminal device does not transmit the SRS. The terminal may perform step 1203a or steps 1203b to 1206. Step 1202: The terminal device transmits the SRS. The terminal device may transmit the SRS based on SRS configuration information, or the terminal device may transmit the SRS based on SRS resources previously configured by the serving cell. For example, the terminal device may transmit the SRS based on SRS resources configured for the terminal by the serving cell by using an RRC reconfiguration message before the serving cell releases the terminal to an unconnected state, or the terminal device may transmit the SRS based on SRS resources / resource identifiers carried in an RRC release message by the serving cell. The terminal device may transmit the SRS in a reference signal SRS transmission period. Step 1203a: The terminal device sends an LPP message to the LMF. The terminal device may use an LPP message to indicate to the LMF that the terminal device has performed cell reselection or that the cell has changed, or may request an SRS configuration update. The terminal device may send an RRC message to a fourth access network device in which the terminal device is located. The RRC message may be an RRC message sent by the terminal device during initial access. For example, an example of the RRC message is an RRC Resume Request message. Alternatively, the message may be another RRC message, for example, an UL Information Transfer message, which is not limited in the present invention. The RRC message here may include a NAS message sent to the AMF and a routing ID. The NAS message may include an LPP PDU. The LPP PDU includes an LPP message sent to the LMF. The AMF may forward the LPP message included in the LPP PDU to the corresponding LMF based on the routing ID. The LPP message may be used to request an SRS configuration update for the terminal device, or may indicate that the terminal device has moved out of the cell, or may indicate that the terminal device has performed cell reselection or that the cell has changed. Optionally, the LPP message may further include a cell ID of the new cell in which the terminal device is located. Optionally, the LPP message may further carry SRS configuration parameters, such as SRS ID, bandwidth, and frequency, which is not limited in this application. After receiving the LPP message, the LMF may send a positioning information request message to the base station in which the newly serving cell is located. After receiving the message, the base station determines an SRS configuration for the terminal device and sends the SRS configuration to the terminal device. Based on this, the terminal device can continue to send SRS in an unconnected state after the cell change. Optionally, after the terminal device sends an RRC message to the fourth access network device in which the terminal device is located, the fourth access network device may release the terminal device to an unconnected state, for example, may send an RRC release message to the terminal device, which avoids the waste of power consumption caused by the terminal device needing to enter a connected state every time the terminal device performs an SRS update, thereby reducing the power consumption of the terminal device. It should be understood that in step 1203a, the terminal device requests the LMF to update the SRS configuration. Optionally, the terminal device may alternatively request the fourth access network device to update the SRS configuration. The terminal device and the access network device may perform steps 1203b to 1206 shown below. Step 1203b: The terminal device sends an RRC message or a MAC message to a fourth access network device in which the terminal device serves, where the message is used to request the fourth access network device to update the SRS. The RRC message may be an RRC message sent by the terminal device during initial access. For example, an example of the RRC message is an RRC Resume Request message. Alternatively, the message may be another RRC message. For example, the RRC message is an RRC Resume Complete message. This is not limited in the present invention. Optionally, the RRC message may further include a reason, which may be used to indicate a request to update the SRS. Optionally, the RRC message or the MAC message may further include a routing ID. Optionally, the RRC message or the MAC message may further carry SRS configuration parameters, such as an SRS ID, a bandwidth, and a frequency. This is not limited in this application. Optionally, after the terminal device sends an RRC message to the fourth access network device in which the terminal device is located, the fourth access network device may immediately release the terminal device to an unconnected state, for example, may send an RRC release message to the terminal device, which avoids the waste of power consumption caused by the terminal device needing to enter a connected state every time the terminal device performs an SRS update, thereby reducing the power consumption of the terminal device. The terminal device sends a MAC message, which prevents the terminal device from entering a connected state when performing an SRS update, thereby reducing the power consumption of the terminal device for updating the SRS configuration. Step 1204: The fourth access network device may determine an SRS configuration for the terminal device. For example, the fourth access network device may autonomously determine the SRS configuration, or the fourth access network device may determine the SRS configuration based on SRS configuration parameters recommended by the terminal. Step 1205: The fourth access network device sends SRS configuration information to the LMF. For example, the fourth access network device may send the SRS configuration information to the LMF by using a positioning information update message, or may send the SRS configuration information to the LMF by using other messages, which are not specifically limited in this application. Step 1206: The fourth access network device sends the SRS configuration information to the terminal device. The fourth access network device may send the SRS configuration to the terminal device by using an RRC message. For example, the RRC message may be an RRC release message, or the RRC message may be an RRC reconfiguration message. The RRC message is not limited in this application. It should be noted that in step 1205 and step 1206, step 1205 may be performed before step 1206, or step 1205 may be performed before step 1206, or step 1205 and step 1206 may be performed simultaneously, which is not specifically limited in this application. After receiving the SRS configuration sent by the fourth access network device, the terminal device transmits the SRS based on the SRS configuration. According to the method in this embodiment, the terminal can transmit the SRS in an unconnected state, thereby achieving positioning. Furthermore, after moving to a new cell or performing cell reselection, the terminal can update the SRS in a timely manner and continue to transmit the SRS, thereby ensuring the continuity of positioning. This application further provides an embodiment of a communication method for realizing positioning. An example flowchart of the embodiment is shown in Figure 13, which may include the following steps: Step 1301: The LMF sends a positioning information request to a first access network device. The positioning information request includes first indication information, which may be used to indicate that the terminal device has the capability of transmitting an SRS in an unconnected state, or the first indication information is used to indicate that a reference signal to be transmitted by the terminal device in an unconnected state is configured. Step 1302: The first access network device determines the SRS configuration information of the terminal device. The first access network device may release the terminal device to an unconnected state. For example, the first access network device may determine to release the terminal device to an unconnected state when the terminal device does not have data service within a certain period of time. Alternatively, the first access network device may release the terminal device to an unconnected state based on the first indication information. It should be understood that the first access network device may release the terminal device to an unconnected state by using the following step 1203. Step 1303: The first access network device sends an RRC release message to the terminal device. Optionally, the RRC release message may include at least one of the following: a routing ID, second indication information, or SRS configuration information. For descriptions of the routing ID and the second indication information, please refer to the related descriptions in the embodiment of the method shown in Figure 2. It should be noted that if the RRC release message carries the second indication information, after step 1032 and before step 1303, the first access network device may send SRS configuration information to the terminal device by using an RRC message. For example, the SRS configuration information may be sent to the terminal device by using an RRC reconfiguration message. Step 1304: The first access network device sends a positioning information response to the LMF. The positioning information response may include SRS configuration information of the terminal device. It should be understood that there is no fixed order between step 1303 and step 1304. The first access network device may first perform step 1303 and then perform step 1304, or may first perform step 1204 and then perform step 1203, or may perform step 1303 and step 1304 simultaneously. Step 1305: The LMF selects a third access network device and sends a measurement request to the third access network device. The third access network device here may be a measurement access network device selected by the LMF and configured to measure the SRS transmitted by the terminal device, for example, may be the above-mentioned first access network device, or may be the above-mentioned second access network device in the area, or may be another access network device. The measurement request may include SRS configuration information of the terminal device. Step 1306: The terminal device transmits the SRS based on the SRS configuration information. The terminal device may determine whether the cell in which the terminal device is located has changed. For example, the terminal device may detect the SSB to obtain the physical cell identifier PCI of the cell and / or detect the SIB1 to obtain the cell global identifier CGI of the cell. When the serving cell has not changed, the terminal device transmits the SRS. For example, the terminal device may transmit an SRS on an SRS frequency domain resource at an SRS transmission period based on the SRS configuration information. If the cell in which the terminal device is located changes, for example, if the terminal device performs cell reselection, or if the terminal detects that the cell ID has changed, the terminal does not transmit the SRS, but directly executes step 1309a or step 1309b and step 1310. Step 1307 is the same as that described in step 408, and the details will not be described again here. Step 1308 is the same as that described in step 409, and the details will not be described again here. Optionally, step 1309a is performed, or step 1309b and step 1310 are performed, when the cell in which the terminal device is serving changes, for example, when the terminal performs cell reselection or when the terminal detects that the cell ID has changed. Step 1309a: The terminal device sends an LPP message to the LMF. The terminal device may use an LPP message to indicate to the LMF that the terminal device has performed cell reselection or that the cell has changed, or may request an SRS configuration update. The terminal device may send an RRC message to a fourth access network device in which the terminal device is located. The RRC message may be an RRC message sent by the terminal device during initial access. For example, an example of the RRC message is an RRC Resume Request message. Alternatively, the message may be another RRC message, for example, an UL Information Transfer message, which is not limited in the present invention. The RRC message here may include a NAS message sent to the AMF and a routing ID. The NAS message may include an LPP PDU. The LPP PDU includes an LPP message sent to the LMF. The AMF may forward the LPP message included in the LPP PDU to the corresponding LMF based on the routing ID. The LPP message may be used to request an SRS configuration update for the terminal device, or may indicate that the terminal device has moved out of the cell, or may indicate that the terminal device has performed cell reselection or that the cell has changed. Optionally, the LPP message may further include a cell ID of the new cell in which the terminal device is located. Optionally, the LPP message may further carry SRS configuration parameters, such as SRS ID, bandwidth, and frequency, which is not limited in this application. After receiving the LPP message, the LMF may return to performing step 1301, i.e., may send a positioning information request message to the base station in the newly serving cell. Based on this, steps 1301 to 1309a may be repeated, so that the terminal device can send SRS in an unconnected state. Optionally, after the terminal device sends an RRC message to the fourth access network device in which the terminal device is located, the fourth access network device may immediately release the terminal device to an unconnected state, for example, may send an RRC release message to the terminal device, which avoids the waste of power consumption caused by the terminal device needing to enter a connected state every time the terminal device performs an SRS update, thereby reducing the power consumption of the terminal device. It should be understood that in step 1309a, the terminal device requests the LMF to update the SRS configuration. Optionally, the terminal device may alternatively request the fourth access network device to update the SRS configuration. The terminal device and the access network device may perform steps 1309b to 1312 shown below. Step 1309b: The terminal device sends an RRC message or a MAC message to a fourth access network device in which the terminal device serves, where the message is used to request the fourth access network device to update the SRS. The RRC message may be an RRC message sent by the terminal device during initial access. For example, an example of the RRC message is an RRC Resume Request message. Optionally, the RRC message may further include a reason, which may be used to indicate a request to update the SRS. Optionally, the RRC message or the MAC message may further include a routing ID. Optionally, the RRC message or the MAC message may further carry SRS configuration parameters, such as an SRS ID, a bandwidth, and a frequency. This is not limited in this application. Optionally, after the terminal device sends an RRC message to the fourth access network device in which the terminal device is located, the fourth access network device may release the terminal device to an unconnected state, for example, may send an RRC release message to the terminal device, which avoids the waste of power consumption caused by the terminal device needing to enter a connected state every time the terminal device performs an SRS update, thereby reducing the power consumption of the terminal device. The terminal device sends a MAC message, which prevents the terminal device from entering a connected state when performing an SRS update, thereby reducing the power consumption of the terminal device for updating the SRS configuration. Step 1310: The fourth access network device may determine an SRS configuration for the terminal device. For the method for determining the SRS configuration information by the fourth access network device, please refer to the related descriptions in step 1202 and step 1203. The details will not be described again here. Step 1311: The fourth access network device sends SRS configuration information to the LMF. For example, the fourth access network device may send the SRS configuration information to the LMF by using a positioning information update message, or may send the SRS configuration information to the LMF by using other messages, which are not specifically limited in this application. Step 1312: The fourth access network device sends SRS configuration information to the terminal device. For the method for sending SRS configuration information to the terminal device by the fourth access network device, please refer to the related descriptions in step 1302 and step 1303. The details will not be described again here. It should be noted that in step 1311 and step 1312, step 1311 may be performed before step 1312, or step 1311 may be performed before step 1312, or step 1311 and step 1312 may be performed simultaneously, which is not specifically limited in this application. According to the method in this embodiment, the terminal can transmit the SRS in an unconnected state, thereby ensuring positioning. According to the method in this embodiment, after cell reselection, the SRS can be updated in a timely manner, and the SRS can be transmitted continuously, thereby ensuring continuity of positioning. Based on the same technical concept as the above-mentioned communication method, an apparatus 900 having a communication function is provided, as shown in FIG. 9 . The apparatus 900 can perform steps performed by a terminal device, an access network device, or an LMF in the above-mentioned method. To avoid repetition, details will not be described again here. The apparatus 900 includes a communication unit 910 and a processing unit 920. Optionally, the apparatus 900 further includes a storage unit 930. The storage unit 930 may be internal to the apparatus 900, or the storage unit 930 may be external to the apparatus 900. The processing unit 920 may be integrated with the storage unit 930. The communication unit 910 may also be referred to as a transceiver, a transceiver device, etc. The processing unit 920 may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, a component in the communication unit 910 configured to realize a receiving function may be considered a receiving unit, and a component in the communication unit 910 configured to realize a transmitting function may be considered a transmitting unit. That is, the communication unit 910 includes a receiving unit and a transmitting unit. The communication unit may also be referred to as a transceiver, a transceiver circuit, etc. The receiving unit may also be referred to as a receiver, a receiver circuit, etc. The transmitting unit may also be referred to as a transmitter, a transmitter circuit, etc.

[0376] In the above method embodiments, the communication unit 910 is configured to perform a sending operation and a receiving operation at the terminal device side, the access network device side, or the LMF side, and the processing unit 920 is configured to perform an operation other than a sending and receiving operation at the terminal device, the access network device, or the LMF in the above method embodiments.

[0377] For example, in one embodiment, the communication unit 910 is configured to perform an LMF-side transmitting operation or an access network device-side receiving operation in step 201 in Figure 2, and to perform an access network device-side transmitting operation or a terminal device-side receiving operation in step 202 in Figure 2, and / or the communication unit 910 is configured to perform other terminal device-side, network device-side, or LMF-side receiving and transmitting steps in embodiments of this application. The processing unit 920 is configured to perform terminal device-side processing steps in step 203 in Figure 2, and / or the processing unit 920 is configured to perform other terminal device-side, network device-side, or LMF-side processing steps in embodiments of this application.

[0378] The storage unit 930 is configured to store a computer program.

[0379] For example, when the apparatus 900 performs the steps performed by a terminal device in the above method, the communication unit 910 is configured to receive, from an access network device, reference signal configuration information configured for the apparatus and information about an area. The processing unit 920 is configured to determine whether the apparatus is within the area. The communication unit 910 is configured to transmit a reference signal within the area based on the reference signal configuration information. For related descriptions of the reference signal configuration information and the information about the area, please refer to the embodiment of the method shown in FIG. 2. The details will not be described again here.

[0380] In one design, the information about the area may include an identifier of the area or information about at least one cell, for which reference is made to the method embodiment shown in FIG.

[0381] In one design, when determining whether the device is within the area, processing unit 920 is specifically configured to determine whether a cell in which the device is located is within the area. When transmitting a reference signal within the area based on reference signal configuration information, communication unit 910 is specifically configured to transmit a reference signal based on the reference signal configuration information if the cell in which the device is located is within the area. For a method for determining whether a cell in which the device is located is within the area, refer to the related description of the embodiment of the method shown in FIG. 2.

[0382] In one design, when determining whether the device is within the area, the processing unit 920 is specifically configured to determine whether a cell serving the device is within the area. When transmitting a reference signal within the area based on the reference signal configuration information, the communication unit 910 is specifically configured to send a second message to the location management function (LMF) if it determines that the cell serving the device is not within the area. The second message is used to notify the LMF that the device has moved out of the area, or the second message is used to request updating of the reference signal configuration information. For a related description of the second message, please refer to the related description of the embodiment of the method shown in FIG. 2 . Details will not be described again here.

[0383] In one design, the communication unit 910 is further configured to receive information related to time from the access network device. The processing unit 920 is further configured to start timing after the communication unit 910 receives the information related to time. The communication unit is further configured to transmit a reference signal based on the reference signal configuration information if the timing duration does not exceed the time, or to send a second message to the LMF if the timing duration exceeds the time. The second message is used to notify the LMF that the timing has ended, or the second message is used to request that the reference signal configuration information be updated. For a related description of the information related to time, refer to the related description of the embodiment of the method shown in FIG. 2 . Details will not be described again here.

[0384] In one design, the communication unit 910 is further configured to receive uplink resource configuration information configured for the device from the access network device. The processing unit 920 is further configured to determine whether the device is within an area. The communication unit 910 is further configured to transmit a third message within the area based on the uplink resource configuration information. The third message is used to transmit uplink data. For the uplink resource configuration information and the third message, refer to the related description of the method embodiment shown in FIG. 2 . Details will not be described again here.

[0385] In one design, the communication unit 910 is further configured to receive a first identifier from the access network device, the first identifier identifying the LMF.

[0386] For example, when the apparatus 900 performs the steps performed by the LMF in the above method, the processing unit 920 is configured to generate a fourth message. The communication unit 910 is configured to send the fourth message to the access network device. The fourth message is used to request the access network device to determine reference signal configuration information for the terminal device, or is used to request reference signal configuration information for the terminal device. The fourth message includes information about the area, where the area is the area where the terminal device transmits the reference signal. For the fourth message and the information about the area, please refer to the related description in the embodiment of the method shown in FIG. 2. The details will not be described again here.

[0387] In one design, the communication unit 910 is further configured to receive reference signal configuration information from the access network device, for which reference signal configuration information, refer to the related description in the method embodiment shown in FIG.

[0388] In one design, communication unit 910 is further configured to transmit reference signal configuration information to access network devices included in the area.

[0389] In one design, the fourth message is further used to request the access network device to configure uplink resources for the terminal device. The uplink resources are used by the terminal device to transmit uplink data. For uplink resource configuration information, refer to the related description in the embodiment of the method shown in FIG. 2. Details will not be described again here.

[0390] In one design, the communication unit 910 is further configured to receive uplink resource configuration information from the access network device. The uplink resource configuration information includes information about uplink resources configured by the access network device for the terminal device.

[0391] In one design, communication unit 910 is further configured to send uplink resource configuration information to access network devices in the area.

[0392] For example, when the apparatus 900 performs the steps performed by the access network device in the above method, the communication unit 910 is configured to receive a fourth message from the location management function (LMF). The processing unit 920 determines reference signal configuration information and information about the area of ​​the terminal device. The communication unit 910 is also further configured to send the reference signal configuration information and information about the area to the terminal device. The area is an area where the terminal device transmits a reference signal. For descriptions of the fourth message, the reference signal configuration information, and the information about the area, please refer to the related descriptions in the embodiment of the method shown in FIG. 2. The details will not be described again here.

[0393] In one design, the communication unit 910 is further configured to transmit information regarding the time. The duration for which the terminal device transmits the reference signal in the area fills the time. For a description of the information regarding the time, refer to the related description in the embodiment of the method shown in FIG. 2. The details will not be described again here.

[0394] In one design, communication unit 910 is further configured to transmit a first identifier, the first identifier identifying the LMF.

[0395] In one design, the communication unit 910 is further configured to send reference signal configuration information to the LMF. For a description of the reference signal configuration information, refer to the related description in the embodiment of the method shown in Figure 2. The details will not be described again here.

[0396] In one design, communication unit 910 is further configured to transmit reference signal configuration information to access network devices within the area.

[0397] In one design, the communication unit 910 is further configured to transmit uplink resource configuration information of the terminal device. The uplink resource configuration information is used by the terminal device to transmit uplink data within the area. For a description of the uplink resource configuration information, refer to the related description in the embodiment of the method shown in FIG. 2 . The details will not be described again here.

[0398] In one design, communication unit 910 is further configured to send uplink resource configuration information to the LMF.

[0399] In one design, communication unit 910 is further configured to send uplink resource configuration information to access network devices in the area.

[0400] When the apparatus is a chip-type apparatus or circuit, the apparatus may include a communication unit and a processing unit. The communication unit may be an input / output circuit and / or a communication interface. The processing unit may be an integrated processor, a microprocessor, or an integrated circuit. The communication unit may input data and output data, and the processing unit may determine output data based on the input data. For example, when the apparatus performs an operation performed by a terminal device, the communication unit may input a first message, the processing unit may determine a reference signal, and the communication unit may output the reference signal. When the apparatus performs an operation performed by an LMF, the communication unit may output a fourth message. When the apparatus performs an operation performed by an access network device, the communication unit may input the fourth message, the processing unit may determine the first message, and the communication unit may output the first message.

[0401] FIG. 10 shows an apparatus 1000 having a communication function according to an embodiment of this application. The apparatus 1000 is configured to implement the functions of a terminal device, an access network device, or an LMF in the above method. In the above method, when the apparatus is configured to implement the functions of a terminal device, the apparatus may be a terminal device, or a chip having the same functions as a terminal device, or a device that can be used with a terminal device. In the above method, when the apparatus is configured to implement the functions of an access network device, the apparatus may be an access network device, or a chip having the same functions as an access network device, or a device that can be used with an access network device. In the above method, when the apparatus is configured to implement the functions of an LMF, the apparatus may be an LMF, or a chip having the same functions as an LMF, or a device that can be used with an LMF.

[0402] The apparatus 1000 includes at least one processor 1020 configured to implement the functions of a terminal device, an access network device, or an LMF in the methods provided in the embodiments of this application. The apparatus 1000 may further include a communication interface 1010. In this embodiment of this application, the communication interface may be a transceiver, a circuit, a bus, a module, or another type of communication interface, configured to communicate with other devices through a transmission medium. For example, the communication interface 1010 is used by a device in the apparatus 1000 to communicate with other devices. The processor 1020 may implement the functions of the processing unit 920 shown in FIG. 9, and the communication interface 1010 may implement the functions of the communication unit 910 shown in FIG. 9.

[0403] The device 1000 may further include at least one memory 1030 configured to store program instructions and / or data. The memory 1030 is coupled to the processor 1020. The coupling in this embodiment of the application may be an electrical, mechanical, or other type of indirect coupling or communication connection between devices, units, or modules, used for information exchange between the devices, units, or modules. The processor 1020 may cooperate with the memory 1030. The processor 1020 may execute program instructions stored in the memory 1030. At least one of the at least one memory may be included in the processor.

[0404] The specific connection medium between the communication interface 1010, the processor 1020, and the memory 1030 is not limited in this embodiment. In this embodiment of the application, the memory 1030, the processor 1020, and the communication interface 1010 are connected through a bus 1040 in FIG. 10. In FIG. 10, the bus is indicated by using a thick line. The connection manner between other components is merely an example for explanation and is not limited thereto. The bus may be classified as an address bus, a data bus, a control bus, etc. For ease of explanation, only one thick line is used to represent a bus in FIG. 10, but this does not mean that there is only one bus or one type of bus.

[0405] An embodiment of the present application further provides a terminal device, which may be a terminal device or a circuit, and may be configured to perform the actions performed by the terminal device in the above method embodiments.

[0406] FIG. 11 is a simplified schematic diagram of the configuration of a terminal device. For ease of explanation, an example in which the terminal device is a mobile phone is used in FIG. 11. As shown in FIG. 11, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input / output device. The processor is mainly configured to process communication protocols and communication data, control the terminal device, execute software programs, process data of the software programs, etc. The memory is mainly configured to store software programs and data. The radio frequency circuit is mainly configured to convert between baseband signals and radio frequency signals and process radio frequency signals. The processor may execute software programs stored in the memory, thereby causing the terminal device to perform the steps performed by the terminal device in the above-mentioned method embodiments. Details will not be described here. The antenna is mainly configured to receive and transmit radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display, or a keyboard, is mainly configured to receive data input by a user and output data to the user. It should be noted that some types of terminal devices may not have input / output devices.

[0407] When data needs to be transmitted, the processor performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal in the form of electromagnetic waves through an antenna. When data needs to be transmitted to a terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, FIG. 11 shows only one memory and one processor. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium, a storage device, etc. The memory may be located independently of the processor or integrated with the processor. This is not limited to this embodiment of the present application.

[0408] In this embodiment of the application, the antenna and radio frequency circuit having transceiver functionality may be considered as a communication unit of the terminal device, for example, communication unit 1110 shown in FIG. 11, and the processor having processing functionality may be considered as a processing unit of the terminal device, for example, processing unit 1120 shown in FIG. 11.

[0409] In another aspect of this embodiment, a computer-readable storage medium is provided, the computer-readable storage medium storing instructions that, when executed, perform the method performed by the terminal device, the access network device, or the LMF in the method embodiments described above.

[0410] In another aspect of this embodiment, there is provided a computer program product comprising instructions that, when executed, cause the method to be performed by the terminal device, the access network device or the LMF in the method embodiments described above.

[0411] In another form of this embodiment, there is provided a communication system, which may include at least one terminal device as described above, at least one access network device, and at least one LMF. The method embodiments shown in Figures 12 and 13 may be realized by using the devices shown in Figures 9 to 11. For specific implementation methods, please refer to the above description.

[0412] It should be understood that the processor referred to in the embodiments of the present invention may be a Central Processing Unit (CPU), or may be other general-purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), Field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0413] It should be further understood that memory referred to in embodiments of the present invention may be volatile memory or nonvolatile memory, or may include volatile memory and nonvolatile memory. Nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) used as an external cache. Many forms of RAM are available, such as, by way of example and not limitation, static random access memory (Static RAM, SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), Synchlink dynamic random access memory (Synchlink DRAM, SLDRAM), and direct Rambus random access memory (Direct Rambus RAM, DR RAM).

[0414] It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (storage module) may be integrated into the processor.

[0415] It should be noted that memory as described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0416] It should be understood that the sequence numbers of the above processes do not mean the execution order in various embodiments of this application, and should be determined according to the execution order, function and internal logic of the processes, and should not be construed as any limitation on the implementation process of the embodiments of the present invention.

[0417] Those skilled in the art may recognize that, in combination with the examples described in the embodiments disclosed in this specification, the units and algorithm steps can be realized by electronic hardware, or a combination of computer software and electronic hardware. Whether a function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to realize the described functions for each specific application, but the implementation method should not be considered to go beyond the scope of this application.

[0418] For the sake of convenience and concise description, the detailed operation processes of the above systems, devices and units may be referred to the corresponding processes in the above method embodiments, and the details will not be described again here, which can be clearly understood by those skilled in the art.

[0419] In some embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are merely examples. For example, the division into units is merely a logical division of function, and other divisions may be used in actual implementations. For example, multiple units or components may be combined or integrated into other systems, or some functions may be omitted or not performed. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be realized using some interfaces. Indirect couplings or communication connections between devices or units may be realized in electronic, mechanical, or other forms.

[0420] Units described as separate parts may or may not be physically separate, and parts shown as units may or may not be physical units, and may be located in one place or distributed across multiple network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

[0421] Furthermore, the functional units in the embodiments of this application may be integrated into one processing unit, or each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0422] When a function is realized in the form of a software functional unit and sold or used as an independent product, the function may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application may essentially be realized, or a portion contributing to the prior art or some of the technical solutions may be realized in the form of a software product. A computer software product is stored in a storage medium and includes some instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or some of the steps of the method described in the embodiments of this application. The above storage medium includes any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0423] The above description is merely a specific implementation of this application and is not intended to limit the scope of protection of this application. Any modifications or replacements that are easily understood by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A communication method applied to a terminal device or a chip of said terminal device, comprising: receiving a Radio Resource Control (RRC) release message from an access network device, the RRC release message including reference signal configuration information and information about an area configured for the terminal device, the information about the area being determined by the access network device based on area information in a positioning information request sent by a Location Management Function (LMF) network element; transmitting a reference signal within the area based on the reference signal configuration information; A method comprising:

2. The method of claim 1 , wherein the information about the area includes an identifier of the area or information about at least one cell.

3. The step of transmitting a reference signal in the area based on the reference signal configuration information includes: determining whether a cell in which the terminal device is located is within the area; transmitting the reference signal based on the reference signal configuration information when the cell in which the terminal device is located is within the area; 3. The method of claim 1 or 2, comprising:

4. The step of transmitting a reference signal in the area based on the reference signal configuration information includes: determining whether a cell in which the terminal device is located is within the area; If the cell in which the terminal device is located is not within the area, sending a second message to the LMF network element, the second message being used to notify the LMF network element that the terminal device has moved out of the area, or the second message being used to request updating of the reference signal configuration information; 4. The method of claim 1, further comprising:

5. A communication device including a processing unit and a communication unit, the processing unit is configured to determine whether the device is within an area; The communication unit is configured to receive a Radio Resource Control (RRC) release message from an access network device, the RRC release message including reference signal configuration information configured for the terminal device and information about the area, and the information about the area is determined by the access network device based on area information in a positioning information request sent by a Location Management Function (LMF) network element; The apparatus, wherein the communication unit is further configured to transmit a reference signal in the area based on the reference signal configuration information.

6. The apparatus of claim 5 , wherein the information about the area includes an identifier of the area or information about at least one cell.

7. When determining whether the device is within the area, the processing unit is specifically configured to determine whether a cell in which the device is located is within the area; 7. The device according to claim 5 or 6, wherein when transmitting the reference signal in the area based on the reference signal configuration information, the communication unit is specifically configured to transmit the reference signal based on the reference signal configuration information if the cell in which the device is located is within the area.

8. When determining whether the device is within the area, the processing unit is specifically configured to determine whether a cell in which the device is located is within the area; The device according to any one of claims 5 to 7, wherein when transmitting the reference signal within the area based on the reference signal configuration information, the communication unit is specifically configured to send a second message to the LMF network element if the cell in which the device is located is not within the area, and the second message is used to notify the LMF network element that the terminal device has moved outside the area, or the second message is used to request that the reference signal configuration information be updated.

9. A communication device including a processor and a memory, the memory is configured to store computer programs or instructions; Apparatus, wherein the processor is configured to execute the computer program or instructions in the memory, thereby performing the method of any one of claims 1 to 4.

10. 1. A computer-readable storage medium, comprising: The computer-readable storage medium stores computer-executable instructions; A computer-readable storage medium, the computer-executable instructions of which, when invoked by a computer, enable the computer to carry out the method of any one of claims 1 to 4.

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