Power control method and apparatus

Abstract

Provided in the present application are a power control method and apparatus. The method can be applied to a random access channelless (RACH-less) handover scenario. The method comprises: a terminal device receiving first information, which comprises a first power control parameter and a first threshold value; determining a first power on the basis of a first parameter and the first threshold value; and sending an access message at the first power, wherein the first parameter comprises at least one of the first power control parameter and a power control adjustment value. By determining a first power on the basis of a first parameter and a first threshold value, the power at which a terminal device sends an access message can be flexibly controlled, thereby reducing a handover interruption delay.

Description

A power control method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 28, 2023, with application number 202311295010.8, and priority to the Chinese patent application entitled “A Power Control Method and Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of communication technology, and more specifically, to a power control method and apparatus. Background Art

[0003] Compared with traditional mobile communication systems, satellite communication systems have a wider coverage range, support asymmetric transmission links, and communication costs are independent of transmission distance. They can overcome natural geographical obstacles such as oceans, deserts, and mountains. Satellite communication systems can provide seamless coverage for user equipment (UE) by deploying base stations or part of the base station functions on high-altitude platforms or satellites. When the base station is deployed on a low-Earth orbit satellite, the cell where the base station provides services to the UE on the ground also moves due to the fast movement speed of the satellite. In order to ensure the continuity of the connected UE service, when the UE moves to the edge of the cell, the UE will be triggered to perform cell switching. During the cell switching process, the UE needs to send an access message to access the access network equipment of the target cell. How to control the power of sending the access message to reduce the switching interruption delay is an issue that needs to be considered.

[0004] Summary of the Invention

[0005] An embodiment of the present application provides a power control method and apparatus, which can flexibly control the power of a terminal device sending an access message, thereby reducing a switching interruption delay.

[0006] In a first aspect, a power control method is provided. This method can be applied to a random access channel-less (RACH-less) handover scenario. The method can be executed by a terminal device or by a chip or circuit configured in the terminal device, and this application does not limit this. The following description uses execution by a terminal device as an example.

[0007] The method includes: a terminal device receives first information, the first information including a first power control parameter and a first threshold; determines a first power based on the first parameter and the first threshold; sends an access message at the first power; wherein the first parameter includes at least one parameter of the first power control parameter and a power control adjustment value.

[0008] Based on the above technical solution, by receiving the first information including the first power control parameter and the first threshold and determining the first power according to the first parameter and the first threshold, the power of the terminal device sending the access message can be flexibly controlled, thereby reducing the switching interruption delay.

[0009] In combination with the first aspect, in certain implementations of the first aspect, when the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, when the first value is less than the first threshold, the first power is determined by the first power control parameter; wherein the first value is determined based on at least one parameter of the first parameters.

[0010] In combination with the first aspect, in certain implementations of the first aspect, when it is determined that the switching condition is met, the access message is sent at the first power; before the first power is determined based on the first parameter and the first threshold, at least one transmission power control command is received from the first communication device; and the power control adjustment value is determined based on the at least one transmission power control command.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the first power control parameter includes at least one of the following: expected power for the terminal device to send PUSCH, and a path loss compensation factor.

[0012] In a second aspect, a power control method is provided. This method can be applied to a random access channel-less (RACH-less) handover scenario. The method can be performed by a first communication device. The second communication device can be a network device, or a chip or circuit configured in the network device, which is not limited in this application. The following description assumes that the method is performed by the second communication device.

[0013] The method includes: sending first information, the first information including a first power control parameter and a first threshold, the first power control is used to determine a first parameter, the first parameter and the first threshold are used to determine a first power for a terminal device to send an access message to a second communication device; wherein the first parameter includes at least one parameter of the first power control parameter and a power control adjustment value.

[0014] In combination with the second aspect, in certain implementations of the second aspect, when the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, when the first value is less than the first threshold, the first power is determined by the first power control parameter; wherein the first value is determined based on at least one parameter of the first parameters.

[0015] In combination with the second aspect, in certain implementations of the second aspect, a switching condition for switching to the second communication device is sent to the terminal device; and at least one transmission power control command is sent to the terminal device, and the at least one transmission power control command is used to determine the power control adjustment value.

[0016] In combination with the second aspect, in certain implementations of the second aspect, the first power control parameter includes at least one of the following: the expected power of the terminal device to send PUSCH, and a path loss compensation factor.

[0017] In a third aspect, a power control method is provided. This method can be applied to random access channel-less (RACH-less) handover scenarios. The method can be executed by a terminal device or by a chip or circuit configured in the terminal device, and this application does not limit this. The following description uses execution by a terminal device as an example.

[0018] The method includes: receiving a second parameter, which is determined based on second information; sending an access message at the first power, which is determined based on the second parameter; wherein the second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, which is determined based on the second power control parameter.

[0019] In combination with the third aspect, in certain implementations of the third aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0020] In combination with the third aspect, in certain implementations of the third aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining a path loss value between the first communication device and the terminal device, and the second power.

[0021] In combination with the third aspect, in certain implementations of the third aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal received by the terminal device from the first communication device, the second reference signal received power is the received power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0022] In combination with the third aspect, in certain implementations of the third aspect, if the second information includes the third parameter, the third parameter is determined based on the power control parameter corresponding to the target cell and the second power control parameter.

[0023] In a fourth aspect, a power control method is provided. The method can be applied to a random access channel-less (RACH-less) handover scenario. The method can be performed by a first communication device, which can be a network device or a chip or circuit configured in the network device, and is not limited in this application. The following description uses the execution by the first communication device as an example.

[0024] The method includes: a first communication device sending second information; receiving a second parameter, the second parameter being determined based on the second information and used to determine a first power at which a terminal device transmits an access message to the second communication device; and sending the second parameter to the terminal device. The second information includes a second power control parameter and / or a third parameter, the second power control parameter being used to determine a second power at which the terminal device transmits an uplink physical shared channel (PUSCH) to the first communication device, and the third parameter being used to determine the second parameter and being determined based on the second power control parameter.

[0025] In combination with the fourth aspect, in certain implementations of the fourth aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0026] In combination with the fourth aspect, in certain implementations of the fourth aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining the path loss value between the first communication device and the terminal device, and the second power.

[0027] In combination with the fourth aspect, in certain implementations of the fourth aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal received by the terminal device from the first communication device, the second reference signal received power is the received power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0028] In combination with the fourth aspect, in certain implementations of the fourth aspect, if the second information includes the third parameter, before the first communication device sends the second information, the first communication device receives third information, and the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell; the third parameter is determined based on the power control parameter corresponding to the target cell and the second power control parameter, and the target cell is one of the at least one candidate cell.

[0029] In a fifth aspect, a power control method is provided. This method can be applied to a random access channel-less (RACH-less) handover scenario. The method can be performed by a second communication device, which can be a network device or a chip or circuit configured in the network device, and is not limited in this application. The following description is based on the example of execution by the second communication device.

[0030] The method includes: receiving second information from a first communication device; sending a second parameter to a terminal device, where the second parameter is determined based on the second information and is used to determine a first power at which the terminal device sends an access message to the second communication device; wherein the second information includes a second power control parameter and / or a third parameter, where the second power control parameter is used to determine a second power at which the terminal device sends an uplink physical shared channel (PUSCH) to the first communication device, and the third parameter is used to determine the second parameter and is determined based on the second power control parameter.

[0031] In combination with the fifth aspect, in certain implementations of the fifth aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0032] In combination with the fifth aspect, in certain implementations of the fifth aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining a path loss value between the first communication device and the terminal device, and the second power.

[0033] In combination with the fifth aspect, in certain implementations of the fifth aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal received by the terminal device from the first communication device, the second reference signal received power is the received power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0034] In combination with the fifth aspect, in certain implementations of the fifth aspect, if the second information includes the third parameter, before the first communication device sends the second information, the third information is sent to the first communication device, and the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell, and the at least one candidate cell includes a target cell, and the third parameter is determined based on the power control parameter corresponding to the target cell and the second power control parameter.

[0035] In the sixth aspect, a communication device is provided, which may include a processing unit and a transceiver unit, the transceiver unit being used to receive first information, the first information including a first power control parameter and a first threshold; the processing unit being used to determine a first power based on the first parameter and the first threshold; the transceiver unit being further used to send an access message at the first power; wherein the first parameter includes at least one parameter among the first power control parameter and the power control adjustment value.

[0036] In combination with the sixth aspect, in certain implementations of the sixth aspect, when the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, when the first value is less than the first threshold, the first power is determined by the first power control parameter; wherein the first value is determined based on at least one parameter of the first parameters.

[0037] In combination with the sixth aspect, in certain implementations of the sixth aspect, the transceiver unit is specifically used to send the access message at the first power when it is determined that the switching condition is met; the transceiver unit is also used to receive at least one transmission power control command from the first communication device; and the processing unit is also used to determine the power control adjustment value based on the at least one transmission power control command.

[0038] In combination with the sixth aspect, in certain implementations of the sixth aspect, the first power control parameter includes at least one of the following: the expected power of the terminal device to send PUSCH, and a path loss compensation factor.

[0039] In the seventh aspect, a communication device is provided, which includes a transceiver unit, wherein the transceiver unit is used to send first information, the first information including a first power control parameter and a first threshold, the first power control is used to determine a first parameter, and the first parameter and the first threshold are used to determine the first power of the terminal device to send an access message to the second communication device; wherein the first parameter includes at least one parameter of the first power control parameter and the power control adjustment value.

[0040] In combination with the seventh aspect, in certain implementations of the seventh aspect, when the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, when the first value is less than the first threshold, the first power is determined by the first power control parameter; wherein the first value is determined based on at least one parameter of the first parameters.

[0041] In combination with the seventh aspect, in certain implementations of the seventh aspect, the transceiver unit is also used to send a switching condition to the terminal device for switching to the second communication device; and send at least one transmission power control command to the terminal device, and the at least one transmission power control command is used to determine the power control adjustment value.

[0042] In combination with the seventh aspect, in certain implementations of the seventh aspect, the first power control parameter includes at least one of the following: the expected power of the terminal device to send PUSCH, and a path loss compensation factor.

[0043] In the eighth aspect, a communication device is provided, which includes a transceiver unit, which is used to receive a second parameter, which is determined based on second information; the transceiver unit is also used to send an access message at the first power, which is determined based on the second parameter; wherein the second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, which is determined based on the second power control parameter.

[0044] In combination with the eighth aspect, in certain implementations of the eighth aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0045] In combination with the eighth aspect, in certain implementations of the eighth aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining a path loss value between the first communication device and the terminal device, and the second power.

[0046] In combination with the eighth aspect, in certain implementations of the eighth aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal from the first communication device received by the terminal device, the second reference signal received power is the received power of the reference signal from the second communication device received by the terminal device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0047] In combination with the eighth aspect, in certain implementations of the eighth aspect, if the second information includes the third parameter, the third parameter is determined based on the power control parameter corresponding to the target cell and the second power control parameter.

[0048] In a ninth aspect, a communication device is provided, comprising a transceiver unit configured to transmit second information; receive a second parameter, the second parameter being determined based on the second information and used to determine a first power at which a terminal device transmits an access message to a second communication device; and the transceiver unit being further configured to transmit the second parameter to the terminal device. The second information comprises a second power control parameter and / or a third parameter, the second power control parameter being used to determine a second power at which the terminal device transmits an uplink physical shared channel (PUSCH) to the device, the third parameter being used to determine the second parameter and being determined based on the second power control parameter.

[0049] In combination with the ninth aspect, in certain implementations of the ninth aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0050] In combination with the ninth aspect, in certain implementations of the ninth aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining a path loss value between the apparatus and the terminal device, and the second power.

[0051] In combination with the ninth aspect, in certain implementations of the ninth aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal from the device received by the terminal device, the second reference signal received power is the received power of the reference signal from the second communication device received by the terminal device, the first path loss value represents the path loss value of the reference signal sent by the device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0052] In combination with the ninth aspect, in certain implementations of the ninth aspect, if the second information includes the third parameter, before the device sends the second information, the transceiver unit is also used to receive third information, and the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell; the device also includes a processing unit, which is used to determine the third parameter based on the power control parameter corresponding to the target cell and the second power control parameter, and the target cell is one of the at least one candidate cell.

[0053] In the tenth aspect, a communication device is provided, which includes a transceiver unit, which is used to receive second information from a first communication device; send a second parameter to a terminal device, the second parameter is determined based on the second information, and the second parameter is used to determine a first power for the terminal device to send an access message to the device; wherein the second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power for the terminal device to send an uplink physical shared channel PUSCH to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

[0054] In combination with the tenth aspect, in certain implementations of the tenth aspect, the second parameter is a first power control parameter; or, the second parameter includes a third power control parameter for determining a third power and / or a power adjustment parameter for adjusting the third power to the first power.

[0055] In combination with the tenth aspect, in certain implementations of the tenth aspect, the second information also includes any one of the following: a measurement report of the terminal device and configuration information for determining a path loss value between the first communication device and the terminal device, and the second power.

[0056] In combination with the tenth aspect, in certain implementations of the tenth aspect, the second information also includes any one of the following items: the difference between the first reference signal received power and the second reference signal received power, and the difference between the first path loss value and the second path loss value; wherein, the first reference signal received power is the received power of the reference signal from the first communication device received by the terminal device, the second reference signal received power is the received power of the reference signal from the device received by the terminal device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the device to the terminal device.

[0057] In combination with the tenth aspect, in certain implementations of the tenth aspect, if the second information includes the third parameter, before the first communication device sends the second information, the transceiver unit is also used to send third information to the first communication device, and the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell, and the at least one candidate cell includes a target cell, and the third parameter is determined based on the power control parameter corresponding to the target cell and the second power control parameter.

[0058] In an eleventh aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the first and third aspects, and any possible implementation of the first and third aspects. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

[0059] In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input / output interface.

[0060] In another implementation, the communication device is a chip configured in a terminal device. When the communication device is a chip configured in a terminal device, the communication interface may be an input / output interface.

[0061] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0062] In a twelfth aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and is configured to execute instructions in the memory to implement the method of the second and fourth aspects, and any possible implementation of the second and fourth aspects. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

[0063] In one implementation, the communication device is a first communication device. When the communication device is the first communication device, the communication interface may be a transceiver or an input / output interface.

[0064] In another implementation, the communication device is a chip configured in the first communication device. When the communication device is a chip configured in the first communication device, the communication interface may be an input / output interface.

[0065] In a thirteenth aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the fifth aspect and any possible implementation of the fifth aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

[0066] In one implementation, the communication device is a second communication device. When the communication device is the second communication device, the communication interface may be a transceiver or an input / output interface.

[0067] In another implementation, the communication device is a chip configured in the second communication device. When the communication device is a chip configured in the second communication device, the communication interface may be an input / output interface.

[0068] In a fourteenth aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method of any possible implementation of aspects 1 to 5.

[0069] In a specific implementation, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be received and input by a receiver, and the signal output by the output circuit may be output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0070] In a fifteenth aspect, a processing device is provided, comprising a processor and a memory. The processor is configured to read instructions stored in the memory and receive signals via a receiver and transmit signals via a transmitter to execute the method of any possible implementation of aspects 1 to 5.

[0071] Optionally, there are one or more processors and one or more memories.

[0072] Optionally, the memory may be integrated with the processor, or be provided separately from the processor.

[0073] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM). The memory can be integrated with the processor on the same chip, or can be set on different chips. The embodiments of the present application do not limit the type of memory and the setting method of the memory and the processor.

[0074] It should be understood that related data interaction processes, such as sending indication information, can be the process of outputting indication information from the processor, and receiving capability information can be the process of receiving input capability information from the processor. Specifically, data output by the processor can be output to the transmitter, and input data received by the processor can be received from the receiver. The transmitter and receiver can be collectively referred to as a transceiver.

[0075] The processing device in the fifteenth aspect may be one or more chips. The processor in the processing device may be implemented in hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated into the processor or located independently of the processor.

[0076] In the sixteenth aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instructions), which, when executed, enables a computer to execute a method in any possible implementation of the first to fifth aspects above.

[0077] In the seventeenth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions) which, when run on a computer, enables the method in any possible implementation of the above-mentioned first to fifth aspects to be executed.

[0078] In the eighteenth aspect, a communication system is provided, comprising the aforementioned terminal equipment, at least one of a first communication device and a second communication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] FIG1 is a schematic diagram of the architecture of satellite communications.

[0080] FIG2 is a schematic diagram of a communication system applicable to an embodiment of the present application.

[0081] FIG3 is a schematic flowchart of a power control method provided in an embodiment of the present application.

[0082] FIG4 is a schematic flowchart of another power control method provided in an embodiment of the present application.

[0083] FIG5 is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0084] FIG6 is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0085] FIG7 is a schematic block diagram of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0087] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, machine to machine (M2M) system, non-terrestrial network (NTN) system, the fifth generation mobile communication system (the 5 th Generation, 5G) system or New Radio (NR) or other future wireless communication systems.

[0088] The NTN system can also be referred to as a satellite communication system. An NTN system refers to a communication network that uses aerial or space platforms as transmission equipment, relay nodes, or base stations. These platforms include, but are not limited to, drones, hot air balloons, airplanes, and satellites. Furthermore, the NTN system can also include high altitude platform station (HAPS) communication systems.

[0089] FIG1 is a schematic diagram of the architecture of a satellite communication system applicable to an embodiment of the present application. The satellite communication system includes satellites 101, 102, and 103, as well as terminal devices. Each satellite can provide services to the terminal devices, such as communication services, navigation services, and positioning services. Satellites can communicate wirelessly with terminal devices via broadcast signals, navigation signals, and the like. Satellites (e.g., satellite 103) can connect to ground stations and communicate wirelessly with ground station equipment.

[0090] Ground stations can provide functions similar to gateways in terrestrial communication systems, such as establishing connections with terminal devices and communicating with servers. They also monitor satellites, perform fault detection, perform packet switching of communication data, and convert interface protocols. Ground stations can be devices in the core network (CN) of existing mobile communication architectures or in future mobile communication architectures, devices used to connect satellites to the core network, or relay devices used for satellite communications.

[0091] Furthermore, satellite communication systems can include both transparent and non-transparent satellite architectures. Transparent transmission, also known as bent-pipe transmission, involves signals being processed only on the satellite, such as frequency conversion and amplification, making the satellite transparent to the signal. Non-transparent transmission, also known as regenerative (on-board access / processing) transmission, involves satellites performing some or all of the base station functions. For example, satellites 101 and 102 in Figure 1 represent non-transparent satellite architectures, while satellite 103 represents a transparent satellite architecture. Furthermore, satellites can operate in either quasi-Earth-fixed or satellite-fixed modes.

[0092] The terminal device referred to in this application may include a communication kit with wireless communication capabilities (the kit may include an antenna, power supply module, cable, and Wi-Fi module, etc.), a handheld device, a vehicle-mounted device, or other processing device connected to a wireless modem. Specifically, it may refer to user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device may also be a communication module with satellite communication capabilities, a satellite phone or its components, a very small aperture terminal (VSAT), a wireless modem, a machine type communication device, or other processing device connected to a wireless modem. The terminal device may also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a terminal in self-driving, remote medical, smart grid, transportation safety, smart city or smart home, or a terminal device in a future communication network. The terminal device in this application may also refer to a chip, modem, system on a chip (SoC) or a communication platform that may include a radio frequency (RF) part, which is mainly responsible for the relevant communication functions in the terminal device.

[0093] The communication device mentioned in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as a network device. The communication device includes, but is not limited to, an evolved node B (eNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission reception point (TRP), etc. The communication device may also be a gNB, TRP or TP in a 5G system, or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system. In addition, the communication device may also be a network node constituting a gNB or TP, such as a BBU, or a distributed unit (DU), etc. Alternatively, the communication device may also be a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT), an Internet of Vehicles communication system, or a device that undertakes network-side functions in other communication systems.

[0094] The satellite mentioned in the embodiments of the present application may be a satellite base station, and may also include an orbital receiver or repeater for relaying information, or a network device carried on a satellite.

[0095] As a possible application scenario, the NTN system may include a satellite system. Based on satellite altitude, i.e., satellite orbit height, satellite systems can be divided into high elliptical orbit (HEO) satellites, GEO satellites, medium Earth orbit (MEO) satellites, and low Earth orbit (LEO) satellites. In addition, the NTN system may also include aerial network equipment such as high altitude platform station (HAPS) communication systems. The aerial network equipment involved in this application is not limited to the above examples.

[0096] As an example, see Figure 2(a), which illustrates a schematic diagram of the architecture of an NTN network. The NTN network includes a first network device, a second network device, a ground base station, a ground core network, and a terminal. The first network device can be a satellite, such as a HEO satellite, GEO satellite, MEO satellite, LEO satellite, or HAPS, without limitation. The second network device can be a gateway (also known as a ground station, earth station, gateway, or gateway station), which can be used to connect the first network device and the base station. The second network device can also be a base station, without limitation. One or more first network devices can be connected to one or more second network devices, and one or more first network devices can be connected to one or more ground base stations through one or more second network devices, without limitation. In Figure 1, the communication mode of the first network device is transparent mode. That is, the first network device acts as an analog RF repeater, performing wireless frequency conversion and amplification, and can transparently transmit or replicate signals between the base station and the terminal. For example, a signal sent by the terminal can be transparently transmitted through the first network device and forwarded by the second network device to the ground base station.

[0097] The embodiment of the present application does not limit the communication mode of the first network device. For example, the communication mode of the first network device may also be a regenerative mode. Please refer to (b) of Figure 2, which shows another architectural diagram of the NTN network. In Figure 2, the communication mode of the first network device is a regenerative mode, that is, the first network device can serve as a base station for wireless communication to regenerate signals received from the ground, and can understand and process these signals. For example, the first network device may be a base station mounted on an artificial earth satellite or a high-altitude aircraft, for example, the base station may be an evolved base station (eNB) or a 5G base station (gNB), etc. The second network device may forward signaling between the first network device (i.e., the base station) and the core network.

[0098] It should be noted that Figure 2(b) only shows one first network device and one second network device. In actual use, an architecture with multiple first network devices and / or multiple second network devices may be adopted as needed. Each first network device may provide services to one or more terminals, each second network device may correspond to one or more first network devices, and each first network device may correspond to one or more second network devices. This embodiment of the present application does not specifically limit this.

[0099] As an example, see Figure 2(c), which shows another NTN network architecture diagram. Figure 2(c) uses two first network devices and two second network devices as an example. The communication mode between the two first network devices is regeneration mode, meaning the two first network devices can serve as base stations for wireless communication. This differs from Figure 2(b) in that an inter-satellite link (ISL) exists between the two first network devices. In this network architecture, different first network devices can communicate with each other and can also be connected to the same terrestrial core network.

[0100] As an example, the first network device can also serve as the DU of the base station, separated from the CU of the ground base station, forming a CU DU distributed architecture. For example, please refer to Figure 2 (d), which shows another architectural diagram of the NTN network. The difference between Figure 2 (d) and Figure 2 (a) is that the first network device, as the DU of the base station, can understand, process and regenerate signals from the ground, rather than just transparently transmitting or copying, while the ground base station only serves as a CU. Under this network architecture, the service link between the terminal device and the first network device can transmit the NR-Uu wireless interface signal, and the feeder link between the first network device and the second network device transmits the satellite radio interface (SRI) signal, and on top of the SRI signal, the F1 interface signal between the DU and the CU is transmitted.

[0101] The power control method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings. In the following description, the method can be applied to any communication system shown in FIG2 .

[0102] To facilitate understanding of the embodiments of the present application, the following first briefly introduces the terms and background involved in the present application.

[0103] 1. Random access channel less (RACH-less) switching

[0104] RACH-less handover means that the terminal device accesses the target cell without triggering a random access procedure. The RACH process typically aims to obtain the target cell's timing advance (TA) and uplink grant (UL grant). If the terminal device can obtain this information (TA and / or UL grant) in advance through other mechanisms, it can directly send message 3 (msg3) to the target cell. This mechanism can reduce handover interruption delay to a certain extent.

[0105] 2. Conditional switching (multi-round trip time, CHO)

[0106] CHO means that after receiving the CHO configuration, the terminal device continues to measure and evaluate candidate cells. When the handover conditions are met, it selects the corresponding cell for access. In NTN scenarios, there are two main types of CHO: time-based CHO and location-based CHO.

[0107] (1) Time-based CHO: The CHO triggering event is defined as a time period configured for each candidate cell, for example, [t1, t2], where t1 is the start time of the time period and t2 is the end time of the time period. CHO is executed when the UE enters the time period.

[0108] (2) Location-based CHO: When the distance between the UE and the reference location of the primary cell (Pcell) is greater than an absolute threshold 1 and the distance between the UE and the conditionally configured candidate cell is less than a decision threshold 2, CHO is performed.

[0109] The following describes the power control method when the UE sends PUSCH. The UE can implement power control when sending PUSCH using the following formula (1):

[0110] Among them, P PUSCH,b,f,c (i,j,q d ,l) represents the power of UE transmitting PUSCH on the uplink bandwidth part (BWP) b activated by carrier f in serving cell c, i is the index of transmission opportunity, j is the index of parameter set configuration, q d is the index of the reference signal; l is the power control adjustment state index; if there is no special instructions, P PUSCH,b,f,c (i,j,q d ,l) can be abbreviated as P PUSCH , P PUSCH It can also be understood as the actual transmit power (in dBm) of the UE sending the PUSCH.

[0111] P CMAX,f,c (i) represents the maximum transmission power configured for the UE to transmit PUSCH on transmission opportunity i of carrier f in serving cell c; P CMAX,f,c (i) can be abbreviated as Pmax, which can also be understood as the maximum PUSCH transmit power (in dBm).

[0112] P O_PUSCH,b,f,c (j) is P O_NOMINAL,PUSCH,f,c (j) and P O_UE_PUSCH,b,f,c(j) and the parameters composed of the sum; where P O_NOMINAL,PUSCH,f,c (j) is a cell-specific parameter, P O_UE_PUSCH,b,f,c (j) is a UE-specific parameter. O_PUSCH,b,f,c (j) is abbreviated as Po. Po can be understood as the expected received power of the transmitted PUSCH.

[0113] is the bandwidth allocated for PUSCH transmission opportunity i of carrier f in serving cell c, in RBs, and μ is the subcarrier spacing (SCS) configuration factor; It can be abbreviated as M. It can be simply expressed as 10log 10 (2M), where M may represent the transmission bandwidth of the PUSCH, or in other words, the number of resource blocks occupied by transmitting the PUSCH.

[0114] PL b,f,c (q d ) is used by the UE with index q d The estimated downlink loss (also called path loss or path loss) value of the reference signal on the activated downlink BWP of carrier f in serving cell c, in dB. b,f,c (q d ) = the difference between referenceSignalPower and the higher-layer filtered reference signal received power (RSRP), where referenceSignalPower is provided by the higher layers, the RSRP of the reference serving cell is defined in 3GPP [7, TS38.215], and the higher-layer filtering configuration of the reference serving cell is provided by the QuantityConfig configuration in 3GPP [12, TS38.331]; b,f,c (q d ) can be abbreviated as PL, which can be understood as the downlink path loss estimated by the UE (in dB).

[0115] α b,f,c (j) is the path loss compensation factor, which is dynamically indicated by the network side. b,f,c (j) can be abbreviated as α.

[0116] Δ TF,b,f,c (i) is the power compensation amount related to the modulation and coding scheme (MCS). When Ks = 1.25, When Ks=0, Δ TF,b,f,c(i) = 0, Ks is provided by deltaMCS for each carrier f and uplink BWP b in the serving cell c. TF,b,f,c (i) can be simply expressed as Δ.

[0117] f b,f,c (i,l) represents the closed-loop power control adjustment value corresponding to power control adjustment state l. If the UE is not provided with the RRC layer configuration parameter tpc-Accumulation, the UE's activated uplink BWP b on carrier f in serving cell c and the PUSCH power control adjustment state l on PUSCH transmission opportunity i is Where, the values ​​of δPUSCH,b,f,c are provided in Table 7.1.1-1. It is the sum of the values ​​indicated by the UE's Transmit Power Control (TPC) command, which are all in the set D i The cardinality of the set is c(Di), where the TPC command is the first K UE TPCs at PUSCH transmission opportunity i-i0. PUSCH (i-i0)-1 symbol to K before PUSCH transmission opportunity i PUSCH The activated uplink BWP b of carrier f of serving cell c for symbol (i) is the value received in PUSCH power control adjustment state l, where i0>0 is the smallest integer, and the first K of PUSCH transmission opportunity i-i0 PUSCH (i-i0)-1 symbol before PUSCH transmission opportunity i K PUSCH (i) symbol. If no special instructions are given later, f b,f,c (i,l) can be abbreviated as f.

[0118] In the above power control process, if the upper layer provides the corresponding P O_UE_PUSCH,b,f,c (j) and the configuration corresponding to α b,f,c (j) Configuration, the UE will reset the accumulated PUSCH power control adjustment state l to f on the BWP b activated on the carrier f of the serving cell c. b,f,c (k, l), where k = 0, 1, ..., i. When the UE switches, the network side generally needs to reconfigure P for the UE. o and α, that is, the configuration corresponding to the target cell P oAccording to existing standards, α will cause the UE to reset the accumulated value of the TPC command, that is, to reset f to 0. If f is 0 during RACH-less handover, the UE may send an access message (for example, msg3, a PUSCH example) to the target cell at a lower power. This may cause the power of msg3 received by the target cell to decrease, thereby reducing the handover success rate.

[0119] In satellite communications, when intra-satellite handover occurs, such as cell handover under a single satellite, or when the gateway or gNB connecting a single satellite to the ground changes, if the terminal is reconfigured with P o and α, the UE will reset the power adjustment amount f for sending PUSCH by default, which may result in a reduction in the transmission power of PUSCH sent to the target cell, thereby causing handover failure.

[0120] The embodiments of the present application provide a power control method and device, which are beneficial to improving and solving the above-mentioned problems.

[0121] In order to facilitate understanding of the embodiments of the present application, the following explanations are made before introducing the embodiments of the present application.

[0122] First, in the embodiments of the present application, "pre-configuration" and "pre-selected settings" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, an access network device or a terminal device). The present application does not limit its specific implementation method.

[0123] Second, the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily indicate the order in which they are executed. The order in which the processes are executed should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation of the embodiments of this application.

[0124] Third, in the embodiments of the present application, “first”, “second” and various numerical numbers are used to distinguish for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, different indication information is used to distinguish.

[0125] Fourth, in the embodiments of the present application, "used to indicate" can include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used to indicate A, it can include that the indication information directly indicates A or indirectly indicates A, and it does not mean that the indication information must carry A.

[0126] In addition, the specific indication method can also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can be referred to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, there may be a situation where the indication methods for different information are different. In the specific implementation process, the required indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

[0127] Fifth, in the embodiments of the present application, descriptions such as "when...", "under...", and "if" all mean that the device will perform corresponding processing under certain objective circumstances. It does not limit the time, nor does it require the device to perform judgment actions when implemented, nor does it mean that there are other limitations.

[0128] Sixth, in the embodiments of the present application, "indication information" and "configuration information" may be explicit indications, i.e., directly indicated by signaling, or obtained by combining other rules, other parameters, or deduction based on parameters indicated by signaling. Alternatively, they may be implicit indications, i.e., obtained by combining rules or relationships, other parameters, or deduction. This application does not impose specific limitations on this.

[0129] FIG3 is a schematic interactive diagram of a power control method 300 provided by the present application. The method can be applied to a RACH-less handover scenario. The method can include the following steps.

[0130] S310: A first communication device sends first information to a terminal device. Correspondingly, the terminal device receives the first information from the first communication device.

[0131] The first information may include a first power control parameter and a first threshold value. The first power control parameter and the first threshold value may be used to determine the power of the terminal device to send a PUSCH to the second communication apparatus.

[0132] The first power control parameter may include the expected transmission power P of the terminal device for sending the PUSCH to the second communication device. o (denoted as P o2 ), a path loss compensation factor α (denoted as α2) for adjusting the path loss value PL2 of the downlink transmission path between the terminal device and the second communication device.

[0133] Exemplarily, when the first communication device determines to switch the terminal device from the serving cell to the target cell, the first communication device sends the first information to the terminal device, wherein the serving cell may be the cell served by the first communication device, and the target cell may be the cell served by the second communication device.

[0134] Exemplarily, the first information may be carried in an RRC reconfiguration message, that is, when the first communication device determines to switch the terminal device to the target cell served by the second communication device, the first communication device sends the relevant configuration of the target cell to the terminal device, which may include the first power control parameter and the first threshold; or, the first information may be carried by a media access control (MAC) control element (CE) or other downlink signaling, such as a signaling dedicated to carrying the first power control parameter and the first threshold, or, the first power control parameter and the first threshold may be carried by different downlink signaling respectively. This application does not limit the specific method of sending the first power control parameter and the first threshold.

[0135] Among them, the specific method by which the first communication device determines to switch the terminal device from the serving cell to the target cell can refer to the existing relevant description. For example, when the first communication device or the terminal device moves, the cell switching process of the terminal device may be triggered, that is, the terminal device can measure the signal quality of at least one candidate cell based on the cell switching measurement configuration, and send a measurement report to the first communication device; the measurement report includes the measurement result of the signal strength of the candidate cell. If the first communication device determines that the measurement result of the target cell meets the switching condition, for example, the switching condition is a condition for determining whether the terminal device can be switched from the serving cell to the candidate cell, and the switching condition is, for example, a switching condition in CHO, if the measurement result of the target cell meets the switching condition, then the first communication device can determine to perform cell switching on the terminal device, or determine to switch the terminal device from the serving cell to the target cell.

[0136] S320: The terminal device determines a first power according to the first parameter and the first threshold.

[0137] The first parameter includes at least one parameter among the first power control parameter and the power control adjustment value, or the first parameter is determined by at least one parameter among the first power control parameters, or the first parameter is determined by at least one parameter among the first power control parameters and the transmission power adjustment value.

[0138] The following is combined with specific examples, taking the first parameter as a different parameter, to illustrate the specific manner in which the terminal device determines the first power based on the first parameter and the first threshold.

[0139] Example 1: The first parameter is a power control adjustment value (denoted as f1).

[0140] The power control adjustment value f1 may be used to adjust the power of the PUSCH sent by the terminal device to the first communication apparatus, and f1 may be determined based on a TPC command sent by the first communication apparatus to the terminal device.

[0141] Specifically, the f1 can be the accumulation of the value indicated by a TPC command; or, the f1 is the accumulation of the power control adjustment value determined based on multiple TPC commands. For example, in the case where the above-mentioned cell switching is CHO switching, after the terminal device receives the first information, and before determining that the CHO switching condition is met to perform cell switching, the first communication device can send at least one TPC command to the terminal device. The terminal device can determine the f1 based on the at least one TPC command (that is, the f1 is a cumulative value), or determine the f1 based on any TPC command (for example, the most recently received TPC command). The present application does not limit the method for determining the power control adjustment value. Among them, the specific method for determining the power control adjustment value based on the TPC command can refer to the above-mentioned method for determining f b,f,c Related description of (i,l).

[0142] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0143] When f1 is greater than threshold #1 (an example of the first threshold), the first power can be determined according to the first power control parameter and f1.

[0144] Specifically, the first power P2=P o2 +10log10(2M)+α2PL2+Δ+f1.

[0145] Among them, P o2 , α2 is an example of the first power control parameter, P o2 The specific meanings of α2 refer to P in formula (1). O_PUSCH,b,f,c (j), α b,f,c (j) means: PL2 can represent the downlink path loss value between the terminal device and the second communication device; the specific meanings of M and Δ refer to formula (1). o2 For the specific determination of α2, PL2, M, and Δ, please refer to the existing relevant description.

[0146] It can be understood that the above parameter P o2 , α2, PL2 are related to the second communication device and / or the target cell. For example, the configuration information used to determine the parameter may be configuration information corresponding to the second communication device and / or the target cell.

[0147] When f1 is less than threshold #1, the first power may be determined according to the first power control parameter. In other words, the value of f1 may not be considered when determining the first power.

[0148] Specifically, the first power P2=P o2 +10log10(2M)+α2PL2+Δ, where P o2 ,α2,M,PL2,ΔRefer to the description of the case where f1 is greater than threshold #1.

[0149] It should be understood that the embodiment of the present application does not limit the case where f1 is equal to threshold #1. For example, when f1 is equal to threshold #1, the first power can be determined by the first power control parameter and f1; or, when f1 is equal to threshold #1, the first power is determined by the first power control parameter and f1.

[0150] Example 2: The first parameter is at least one parameter of the first power control parameters.

[0151] That is, the first parameter can be P o2 or α2.

[0152] Optionally, the first parameter may be P o2 , any parameter in M, PL2 (or α2PL2), Δ, or the sum of any two or more parameters.

[0153] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0154] When the first parameter is greater than threshold #2 (an example of the first threshold), the first power can be determined according to the first power control parameter. Specific determination methods refer to the case where f1 is less than threshold #1.

[0155] When the first parameter is less than threshold #2, the first power can be determined based on the first power control parameter and f1. In other words, the value of f1 can be considered when determining the first power. The specific determination method is similar to the case where f1 is greater than threshold #1.

[0156] Similarly, the embodiment of the present application does not limit the case where the first parameter is equal to threshold #2.

[0157] It is understood that when the first parameter is a different parameter, the value of the threshold #2 may be different. In other words, the threshold #2 may include thresholds corresponding to different first parameters.

[0158] Example 3: The first parameter is determined by at least one parameter of the first power control parameter and the power control adjustment value.

[0159] For example, the first parameter (denoted as P0) can be expressed as: P0=P o2 +10log10(2M)+α2PL2+Δ+f1.

[0160] Among them, P o2 , α2 is an example of the first power control parameter, M, PL2, Δ can refer to the description of the case where f1 is greater than the threshold #1.

[0161] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0162] When the first parameter is greater than threshold #3 (an example of the first threshold), the first power can be determined according to the first power control parameter. Specific determination methods refer to the case where f1 is less than threshold #1.

[0163] When the first parameter is less than threshold #3, the first power can be determined based on the first power control parameter and the power control adjustment value. In other words, the value of f1 can be considered when determining the first power. The specific determination method is similar to the case where f1 is greater than threshold #1.

[0164] Similarly, the embodiment of the present application does not limit the case where the first parameter is equal to threshold #3.

[0165] S330: The terminal device sends an access message to the second communication apparatus at the first power. Correspondingly, the second communication apparatus receives the access message from the terminal device.

[0166] Exemplarily, if the cell switching is CHO switching, sending the access message to the second communication device at the first power may be sending the access message at the first power when it is determined that the CHO switching condition is met.

[0167] In a RACH-less handover scenario, the access message may be a msg3 message, that is, the terminal device sends the msg3 message for accessing the second communication device to the second communication device at the first power in the target cell.

[0168] Optionally, the method further includes: the second communication device sending an acknowledgement (ACK) message to the terminal device, indicating that the terminal device has switched successfully.

[0169] Optionally, during subsequent communication between the terminal device and the second communication apparatus, the second communication apparatus may send a TPC command to the terminal device to adjust the power of an uplink signal or uplink data sent by the terminal device to the second communication apparatus.

[0170] The first and second communication devices described above may be different nodes in an NTN communication scenario, and may be used to carry some or all of the gNB functionality. Alternatively, the first and second communication devices may be different gNBs or ground stations in the NTN communication scenario. Taking a satellite communication scenario as an example, the first communication device may be a first satellite, and the second communication device may be a second satellite. Alternatively, the first communication device may be different ground stations or terrestrial gNBs corresponding to the satellites for accessing the terrestrial network.

[0171] FIG4 is a schematic interactive diagram of another power control method 400 provided by the present application. The method can be applied to RACH-less handover scenarios. The method can include the following steps.

[0172] S410: A first communication device sends second information to a second communication device. Correspondingly, the second communication device receives the second information from the first communication device.

[0173] The second information may include a second power control parameter, wherein the second power control parameter may be used to determine a second power at which the terminal device transmits the PUSCH to the first communication apparatus.

[0174] Exemplarily, the second power control parameter may include P o1 , α1, and f1. Among them, P o1 The specific meanings of α1 refer to P in formula (1). O_PUSCH,b,f,c (j), α b,f,c (j) means. f1 is the power control parameter, which can be used to control the power of the o1 The power determined by α1 is adjusted to the second power, and f1 can be determined according to the at least one TPC command (ie, f1 is a cumulative value), or determined according to any TPC command, which is not limited in this application.

[0175] Understandable, P. o1 , α1 and f1 are related to the first communication device and / or the serving cell. For example, the configuration information used to determine the parameter may be configuration information corresponding to the first communication device and / or the serving cell, or may be determined by a signal (e.g., a reference signal or instruction) or data sent by the first communication device.

[0176] Optionally, the second information may also include configuration information for determining the second power control parameter, such as one or more of P0-PUSCH-AlphaSet, P0-PUSCH-AlphaSeID, P0-PUSCH-Set-r16, p0-PUSCH-SetID, p0-List, PUSCH-PowerControl, SRI-PUSCH-PowerControl, sri-PUSCH-PowerControlID, and sri-P0-PUSCH-AlphaSetID.

[0177] Optionally, the second information further includes any one of the following:

[0178] The measurement report of the terminal device is used to determine the configuration information of the path loss value PL1 between the first communication device and the terminal device, PL2 and the high-layer filtered RSRP of the reference signal received from the second communication device, or the second power.

[0179] The measurement report of the terminal device may be obtained by the terminal device measuring at least one candidate cell based on the measurement configuration information, where the at least one candidate cell includes the target cell; the configuration information used to determine PL1 may be, for example, referenceSingnalPower and high-layer filtered RSRP. The second power is the power at which the terminal device sends the PUSCH to the first communication device. By sending the second power control parameter and the second power to the second communication device, the second communication device can determine the path loss value PL1 between the first communication device and the terminal device.

[0180] Furthermore, the second information also includes any one of the following:

[0181] a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value;

[0182] Among them, the first reference signal receiving power is the receiving power of the reference signal received by the terminal device from the first communication device, and the second reference signal receiving power is the receiving power of the reference signal received by the terminal device from the second communication device; the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, that is, PL1, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

[0183] Exemplarily, when the first communication device determines to switch the terminal device from the serving cell to the target cell, the first communication device sends the second information to the terminal device. For example, the second information may be carried by a switching request message sent by the first communication device to the second communication device, or the second information may be carried by a dedicated message (i.e., a message dedicated to carrying the second information), which is not limited in this application. The serving cell may be the cell served by the first communication device, and the target cell may be the cell served by the second communication device.

[0184] Optionally, the second information includes a third parameter, that is, the second information may include at least one of the second power control parameter and the third parameter. The third parameter is determined based on the second power control parameter, the third parameter is used to determine the second parameter, and the second parameter is used to determine the power of the terminal device to send the PUSCH to the second communication device.

[0185] In a case where the second information includes the third parameter, before the first communication device sends the second information, the method includes:

[0186] S401: The second communication device sends third information to the first communication device. Correspondingly, the first communication device receives the third information from the second communication device.

[0187] The third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell. The at least one candidate cell includes the target cell. That is, before the first communication device sends the second information, the first communication device knows the power control parameter corresponding to the target cell, and the power control parameter is, for example, P o , α (for the convenience of description, the power control parameter corresponding to the target cell known to the second communication device is recorded as Po0, α0).

[0188] S402: The first communication device determines the third parameter according to the power control parameter corresponding to the target cell and the second power control parameter.

[0189] Exemplarily, the third parameter includes a change in the second power control parameter relative to the power control parameter corresponding to the target cell. In other words, the third parameter includes an adjustment amount of the power control parameter of the target cell by the first communication device. For example, the third parameter may include the difference between Po0 and Po1 (or the absolute value of the difference, denoted as ΔPo), and the difference between α0 and α1 (or the absolute value of the difference, denoted as Δα).

[0190] Optionally, the second communication device may adjust the power control parameter of the target cell based on the third parameter, that is, adjust the power control parameter of the target cell to the first power control parameter, for example, Po2 =Po0+ΔPo, α2=α0+Δα.

[0191] Optionally, the method further includes S420a or S420b:

[0192] S420a: The second communication device sends a second parameter to the first communication device. Correspondingly, the first communication device receives the second parameter from the second communication device.

[0193] The second parameter is determined based on the second information, and the second parameter is used to determine a first power at which the terminal device sends an access message to the second communication apparatus.

[0194] That is, the first communication device sends information related to determining the power of the terminal device to send PUSCH to the first communication device (i.e., the second information) to the second communication device, so that the second communication device determines the parameters related to determining the power of the terminal device to send PUSCH to the second communication device (i.e., the second parameter) based on the second information.

[0195] Specifically, the second parameter may include a first power control parameter for determining the first power. The first power control parameter may include P o2 ,α2. Among them, P o2 The specific meanings of α2 refer to P in formula (1). O_PUSCH,b,f,c (j), α b,f,c (j) The meaning indicated.

[0196] That is, the first power (denoted as P2) can be expressed as: P2 = P o2 +10log10(2M)+α2PL2+Δ, or, P2=P o2 +10log10(2M)+α2PL2+Δ+f1.

[0197] Among them, P o2 And α2 is determined based on the second information.

[0198] Exemplarily, the second communication device can determine whether to set the first power control parameter to be greater than or equal to the second power control parameter based on the second power control parameter and / or third parameter included in the second information, and / or based on whether the power value determined based on the second power control parameter meets a preset condition (for example, greater than or equal to a threshold).

[0199] Optionally, the second parameter may further include a power adjustment parameter (denoted as β), which is determined based on the second information and may be used to adjust the power (third power) determined based on the first power control parameter to the first power.

[0200] For example, the third power (denoted as P3) can be expressed as: P3 = P o2 +10log10(2M)+α2PL2+Δ, or, P3=P o2 +10log10(2M)+α2PL2+Δ+f1, then the first power can be expressed as: P2=βP3. Or, P2=βP3.

[0201] Alternatively, the power adjustment parameter can be used to adjust P in the P3 determination formula. o2 , 10log10(2M), α2PL2, Δ and any one or more of f1 to obtain P2. For example, P2 = βP o2 +10log10(2M)+α2PL2+Δ; or, P2=β(P o2 +10log10(2M)+10log10(2M)+α2PL2+Δ)+f1, or, P2=P o2 +10log10(2M)+10log10(2M)+α2PL2+Δ+βf1, etc., are not listed here one by one.

[0202] Optionally, in S310, the second communication device may also send β to the first communication device and / or the terminal device, so that the terminal device adjusts the first power according to the parameter β after determining that the first parameter is greater than the first threshold.

[0203] Optionally, the second communication device may o2 , α2, is sent to the first communication device, so that the first communication device, after receiving the measurement report from the terminal device, determines whether the terminal device needs to reset the power control adjustment value f1 when sending the PUSCH to the second communication device. The first communication device can send the first indication information and / or the power adjustment parameter to the terminal device.

[0204] S420b: The second communication device sends a first power control parameter and first indication information to the first communication device. Correspondingly, the first communication device receives the first power control parameter and first indication information from the second communication device.

[0205] The first power control parameter may include P o2 ,α2.P o2 The specific meanings of α2 refer to P in formula (1). O_PUSCH,b,f,c (j), α b,f,c (j) means the following. o2 , the determination method of α2 can refer to the existing related description. Optionally, the first communication device and / or the second communication device can also adjust P O_NOMINAL,PUSCH,f,c(j) and / or P O_UE_PUSCH,b,f,c (j) Implement adjustments to Po2.

[0206] The first indication information may be determined based on the second information. The first indication information is used to indicate whether to determine the first power based on the first power control parameter and the power control adjustment value, or in other words, the first indication information is used to indicate whether to adjust the first power based on the power control adjustment value when the first power is determined based on the first power control parameter.

[0207] Exemplarily, the first indication information is configured by reset-disable. When the reset-disable value is "0" or "1", it respectively indicates that the first power is determined based on the first power control parameter and the power control adjustment value, or the first power is determined based only on the first power control parameter (or, the first power is not determined based on the power control adjustment value); or, when the reset-disable is sent to the terminal device, it indicates that the first power is determined based on the first power control parameter and the power control adjustment value, and when the reset-disable is not sent to the terminal device, it indicates that the first power is determined based only on the first power control parameter (or, the first power is not determined based on the power control adjustment value).

[0208] Optionally, the second parameter may include the first power control parameter, a power adjustment parameter β and the first indication information.

[0209] For example, when the terminal device determines, based on the first indication information, that the first power is determined based on the first power control parameter and the power control adjustment value, the terminal device may also adjust the first power based on the power adjustment value; or, when the terminal device determines, based on the first indication information, that the first power is determined only based on the first power control parameter (or, not based on the power control adjustment value), the terminal device may also adjust the first power based on the power adjustment value.

[0210] The power adjustment value and the first indication information may be carried in RRC reconfiguration, MAC CE or DCI signaling respectively or simultaneously, or may be sent separately, and this application does not impose any limitation on this.

[0211] For example, when the RACH-less is a configured grant, the second parameter can be sent to the terminal device in the RRC signaling, following the configured grant or in the configured grant; when it is a dynamic grant, it can be sent in the RRC signaling or through the DCI, and this application does not limit this.

[0212] The following takes the simultaneous delivery of the first indication information and the power adjustment value as an example to introduce a method for delivering the first indication information and the power adjustment value. When the first indication information and the power adjustment value are configured in RRC signaling, the first indication information and the power adjustment value can be configured in RACH-lessHO-r18 in the RRC signaling, for example:

[0213] The handover command can be included in the RRC reconfiguration or sent separately. The handover command can be sent in the form of RRC / MAC CE / DCI signaling. Therefore, the first indication information and the power adjustment value can also be sent in the handover command, which is not limited in this application.

[0214] Exemplarily, the second communication device may configure the first indication information and the power adjustment value through P0-PUSCH-AlphaSet and indicate it through p0-PUSCH-AlphaSetID. The first indication information and the power adjustment value may be configured in P0-PUSCH-AlphaSet, and the specific configuration is as follows:

[0215] The relevant parameters may also be configured in P0-PUSCH-Set-r16 / SRI-PUSCH-PowerControl, which is not limited in this application.

[0216] S430: The first communication device sends the second parameter to the terminal device. Correspondingly, the terminal device receives the second parameter from the first communication device.

[0217] S440: The terminal device sends an access message to the second communication apparatus at the first power. Correspondingly, the second communication apparatus receives the access message from the terminal device.

[0218] For details of this step, please refer to the description in S330.

[0219] In the present application, when configuring RACH-less switching related parameters, the first communication device and / or the second communication device may also simultaneously choose to configure power-ramping-enable and send it to the terminal device. At the same time, the power boost value (powerRampingStep) and the maximum number of retransmissions (TransMax) may also be sent. Power-ramping-enable indicates whether the UE can perform a power boost (power ramping) operation after the first PUSCH transmission fails. For example, when power-ramping-enable=1, it can indicate that the terminal device can increase the transmission power by powerRampingStep for retransmission when the first PUSCH transmission fails.

[0220] The power control method provided in the embodiment of the present application is described in detail above with reference to Figures 3 and 4. Below, the communication device provided in the embodiment of the present application is described in detail with reference to Figures 5 to 7. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for matters not described in detail, reference can be made to the method embodiment above. For the sake of brevity, they will not be repeated here.

[0221] 5 shows a schematic diagram of a communication device 500 provided in an embodiment of the present application. The device 500 includes a transceiver unit 510, which can be used to implement corresponding communication functions and can also be referred to as a communication interface or a communication unit.

[0222] Optionally, the apparatus 500 may further include a processing unit 520 , which may be configured to perform data processing.

[0223] Optionally, the device 500 also includes a storage unit, which can be used to store instructions and / or data. The processing unit 520 can read the instructions and / or data in the storage unit so that the device can implement the actions of different devices in the aforementioned method embodiments.

[0224] In one possible design, the apparatus 500 may be the terminal device in the aforementioned embodiment, or may be a component of the terminal device (e.g., a chip). The apparatus 500 may implement steps or processes corresponding to those performed by the terminal device in the above method embodiment. The transceiver unit 510 may be used to perform transceiver-related operations of the terminal device in the above method embodiment, such as the transceiver-related operations of the terminal device in the embodiment shown in Figures 3 and 4; the processing unit 520 may be used to perform processing-related operations of the terminal device in the above method embodiment, such as the processing-related operations of the terminal device in the embodiment shown in Figures 3 and 4.

[0225] In another possible design, the device 500 can be the first communication device in the aforementioned embodiment, or it can be a component (such as a chip) of the first communication device. The device 500 can implement the steps or processes corresponding to those performed by the first communication device in the above method embodiment. Among them, the transceiver unit 510 can be used to perform the transceiver-related operations of the first communication device in the above method embodiment, such as the transceiver-related operations of the first communication device in the embodiment shown in Figures 3 and 4; the processing unit 520 can be used to perform the processing-related operations of the first communication device in the above method embodiment, such as the processing-related operations of the first communication device in the embodiment shown in Figures 3 and 4.

[0226] In another possible design, the device 500 can be the second communication device in the aforementioned embodiment, or it can be a component (such as a chip) of the second communication device. The device 500 can implement the steps or processes corresponding to those performed by the second communication device in the above method embodiment. Among them, the transceiver unit 510 can be used to perform the transceiver-related operations of the second communication device in the above method embodiment, such as the transceiver-related operations of the second communication device in the embodiment shown in Figures 3 and 4; the processing unit 520 can be used to perform the processing-related operations of the second communication device in the above method embodiment, such as the processing-related operations of the second communication device in the embodiment shown in Figures 3 and 4.

[0227] Figure 6 is a schematic block diagram of a communication device 600 provided in an embodiment of the present application. The device 600 includes a processor 610, which is coupled to a memory 620. Optionally, the memory 620 is further included. The memory 620 is used to store computer programs or instructions and / or data. The processor 610 is used to execute the computer programs or instructions stored in the memory 620, or read the data stored in the memory 620, to perform the methods described in the above method embodiments.

[0228] Optionally, there are one or more processors 610 .

[0229] Optionally, there are one or more memories 620 .

[0230] Optionally, the memory 620 is integrated with the processor 610 or provided separately.

[0231] 6 , the apparatus 600 further includes a transceiver 630 , which is configured to receive and / or transmit signals. For example, the processor 610 is configured to control the transceiver 630 to receive and / or transmit signals.

[0232] As a solution, the apparatus 600 is used to implement the operations performed by the terminal device in each of the above method embodiments.

[0233] For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 620 to implement the relevant operations of the terminal device in the above various method embodiments, such as the methods executed by the terminal device in the embodiments shown in Figures 3 and 4.

[0234] As another solution, the device 600 is used to implement the operations performed by the first communication device in the above various method embodiments.

[0235] For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 620 to implement the relevant operations of the first communication device in the above various method embodiments, such as the methods performed by the first communication device in the embodiments shown in Figures 3 and 4.

[0236] As another solution, the device 600 is used to implement the operations performed by the second communication device in the above various method embodiments.

[0237] For example, the processor 610 is configured to execute computer programs or instructions stored in the memory 620 to implement the relevant operations of the second communication device in the above various method embodiments, such as the methods performed by the second communication device in the embodiments shown in Figures 3 and 4.

[0238] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor 610 or by instructions in the form of software. The method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 620, and the processor 610 reads the information in the memory 620 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0239] It should be understood that in the embodiments of the present application, the processor may be one or more integrated circuits for executing relevant programs to execute the method embodiments of the present application.

[0240] A processor (e.g., processor 610) may include one or more processors and be implemented as a combination of computing devices. The processor may include one or more of the following: a microprocessor, a microcontroller, a digital signal processor (DSP), a digital signal processing device (DSPD), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), gating logic, transistor logic, discrete hardware circuits, processing circuits, or other suitable hardware, firmware, and / or a combination of hardware and software to perform the various functions described in this disclosure. The processor may be a general-purpose processor or a special-purpose processor. For example, processor 610 may be a baseband processor or a central processing unit. A baseband processor may be used to process communication protocols and communication data. A central processing unit may be used to enable the device to execute software programs and process data in the software programs. In addition, a portion of the processor may also include non-volatile random access memory. For example, the processor may also store information about the device type.

[0241] In this application, the term "program" is used broadly to refer to software. Non-limiting examples of software include program code, program, subroutine, instruction, instruction set, code, code segment, software module, application, or software application. The program can be executed in a processor and / or computer to cause the device to perform the various functions and / or processes described in this application.

[0242] The memory (e.g., memory 620) can store data required by the processor (e.g., processor 610) when executing software. The memory can be implemented using any suitable storage technology. For example, the memory can be any available storage medium that can be accessed by the processor and / or computer. Non-limiting examples of storage media include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM), removable media, optical disk storage, magnetic disk storage media, magnetic storage devices, flash memory, registers, state memory, remotely mounted storage, local or remote memory components, or any other medium capable of carrying or storing software, data, or information and accessible by a processor / computer. It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0243] The memory (e.g., memory 620) and the processor (e.g., processor 610) may be provided separately or integrated together. The memory may be used to connect to the processor so that the processor can read information from the memory and store and / or write information in the memory. The memory may be integrated into the processor. The memory and the processor may be provided in an integrated circuit (e.g., the integrated circuit may be provided in a UE or other network node).

[0244] 7 is a schematic block diagram of a chip system 700 provided in an embodiment of the present application. The chip system 700 (or also referred to as a processing system) includes a logic circuit 710 and an input / output interface 720.

[0245] The logic circuit 710 may be a processing circuit in the chip system 700. The logic circuit 710 may be coupled to a storage unit and call instructions in the storage unit so that the chip system 700 can implement the methods and functions of the various embodiments of the present application. The input / output interface 720 may be an input / output circuit in the chip system 700, outputting information processed by the chip system 700 or inputting data or signaling information to be processed into the chip system 700 for processing.

[0246] As a solution, the chip system 700 is used to implement the operations performed by the terminal device in the above various method embodiments.

[0247] For example, the logic circuit 710 is used to implement the processing-related operations performed by the terminal device in the above method embodiments, for example, the processing-related operations performed by the terminal device in the embodiments shown in Figures 3 and 4; the input / output interface 720 is used to implement the sending and / or receiving-related operations performed by the terminal device in the above method embodiments, for example, the sending and / or receiving-related operations performed by the terminal device in the embodiments shown in Figures 4 and 7.

[0248] As another solution, the chip system 700 is used to implement the operations performed by the first communication device in the above various method embodiments.

[0249] For example, the logic circuit 710 is used to implement the processing-related operations performed by the first communication device in the above method embodiments, for example, the processing-related operations performed by the first communication device in the embodiments shown in Figures 3 and 4; the input / output interface 720 is used to implement the sending and / or receiving-related operations performed by the first communication device in the above method embodiments, for example, the sending and / or receiving-related operations performed by the first communication device in the embodiments shown in Figures 3 and 4.

[0250] As another solution, the chip system 700 is used to implement the operations performed by the second communication device in the above various method embodiments.

[0251] For example, the logic circuit 710 is used to implement the processing-related operations performed by the second communication device in the above method embodiments, for example, the processing-related operations performed by the second communication device in the embodiments shown in Figures 3 and 4; the input / output interface 720 is used to implement the sending and / or receiving-related operations performed by the second communication device in the above method embodiments, for example, the sending and / or receiving-related operations performed by the second communication device in the embodiments shown in Figures 3 and 4.

[0252] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions are stored for implementing the methods executed by a communication device (such as a terminal device, a first communication device, or a second communication device) in the above-mentioned method embodiments.

[0253] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed by a computer, implement the methods performed by a communication device (such as a terminal device, a first communication device, or a second communication device) in the above-mentioned method embodiments.

[0254] An embodiment of the present application also provides a communication system, which includes one or more of the terminal equipment, the first communication device and the second communication device in the above embodiments.

[0255] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0256] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above-mentioned units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0257] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to implement the solutions provided in this application.

[0258] In addition, each functional unit in each embodiment of the present application may be integrated into one unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0259] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0260] When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). About computer-readable storage media, reference can be made to the above description.

[0261] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A power control method, characterized in that: Applied to a RACH-less handover scenario, the method includes: The terminal device receives first information, where the first information includes a first power control parameter and a first threshold; Determine a first power according to a first parameter and the first threshold; sending an access message at the first power; The first parameter includes at least one of the first power control parameter and a power control adjustment value.

2. The method according to claim 1, characterized in that: The determining the first power according to the first parameter and the first threshold comprises: In a case where the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, In a case where the first value is less than the first threshold, the first power is determined by the first power control parameter; The first value is determined according to at least one parameter of the first parameters.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: Receiving a switching condition from a first communication device to a second communication device, wherein sending the access message to the second communication device at the first power comprises: When it is determined that the switching condition is met, sending the access message at the first power; Before determining the first power according to the first parameter and the first threshold, the method further includes: receiving at least one transmission power control command from the first communication device; The power control adjustment value is determined based on the at least one transmit power control command.

4. The method according to any one of claims 1 to 3, characterized in that The first power control parameter includes at least one of the following: The expected power of the PUSCH sent by the terminal device and the path loss compensation factor.

5. A power control method, characterized in that: Applied to a RACH-less handover scenario, the method includes: Sending first information, where the first information includes a first power control parameter and a first threshold, where the first power control parameter is used to determine a first parameter, where the first parameter and the first threshold are used to determine a first power at which a terminal device sends an access message to a second communication device; The first parameter includes at least one of the first power control parameter and a power control adjustment value.

6. The method according to claim 5, characterized in that The first parameter and the first threshold are used to determine a first power at which the terminal device sends an access message to the second communication device, including: In a case where the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, In a case where the first value is less than the first threshold, the first power is determined by the first power control parameter; The first value is determined according to at least one parameter of the first parameters.

7. The method according to claim 5 or 6, characterized in that: The method further comprises: Sending a switching condition to the second communication device to the terminal device; The method further comprises: At least one transmission power control command is sent to the terminal device, where the at least one transmission power control command is used to determine the power control adjustment value.

8. The method according to any one of claims 5 to 7, characterized in that The first power control parameter includes at least one of the following: The expected power of the PUSCH sent by the terminal device and the path loss compensation factor.

9. A power control method, characterized in that: Applied to a RACH-less handover scenario, the method includes: receiving a second parameter, wherein the second parameter is determined according to the second information; sending an access message at the first power, where the first power is determined according to the second parameter; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

10. The method according to claim 9, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first power.

11. The method according to claim 9 or 10, characterized in that: The second information also includes any one of the following: The measurement report of the terminal equipment and the configuration information for determining the path loss value between the first communication device and the terminal equipment, and the second power.

12. The method according to claim 9 or 10, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; Among them, the first reference signal reception power is the reception power of the reference signal received by the terminal device from the first communication device, the second reference signal reception power is the reception power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

13. The method according to any one of claims 9 to 12, characterized in that If the second information includes the third parameter, the third parameter is determined according to the power control parameter corresponding to the second communication device and the second power control parameter.

14. A power control method, characterized in that: Applied to a RACH-less handover scenario, the method includes: The first communication device sends the second information; receiving a second parameter, where the second parameter is determined according to the second information, and the second parameter is used to determine a first power at which the terminal device sends an access message to the second communication device; Sending the second parameter to the terminal device; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

15. The method according to claim 14, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first power.

16. The method according to claim 14 or 15, characterized in that The second information also includes any one of the following: A measurement report of a terminal device and configuration information for determining a path loss value between the first communication device and the terminal device, and the second power.

17. The method according to claim 14 or 15, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; Among them, the first reference signal reception power is the reception power of the reference signal received by the terminal device from the first communication device, the second reference signal reception power is the reception power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

18. The method according to any one of claims 14 to 17, characterized in that If the second information includes the third parameter, before the first communication device sends the second information, the method includes: The first communication device receives third information, where the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell; The third parameter is determined according to a power control parameter corresponding to a target cell and the second power control parameter, and the target cell is one of the at least one candidate cell.

19. A power control method, characterized in that: Applied to a RACH-less handover scenario, the method includes: receiving second information from the first communication device; Sending a second parameter to the terminal device, where the second parameter is determined according to the second information, and the second parameter is used to determine a first power at which the terminal device sends an access message to the second communication apparatus; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

20. The method according to claim 19, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter for determining a third power and / or a third power control parameter for adjusting the third power to the first power. Power adjustment parameters for power.

21. The method according to claim 19 or 20, characterized in that The second information also includes any one of the following: The measurement report of the terminal equipment and the configuration information for determining the path loss value between the first communication device and the terminal equipment, and the second power.

22. The method according to claim 19 or 20, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; Among them, the first reference signal reception power is the reception power of the reference signal received by the terminal device from the first communication device, the second reference signal reception power is the reception power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

23. The method according to any one of claims 19 to 22, characterized in that If the second information includes the third parameter, before the first communication device sends the second information, the method includes: Sending third information to the first communication device, the third information including a power control parameter corresponding to each candidate cell in at least one candidate cell, the at least one candidate cell including a target cell, the third parameter being determined based on the power control parameter corresponding to the target cell and the second power control parameter.

24. A communication device, characterized in that: The device comprises a transceiver unit and a processing unit. The transceiver unit is used to receive first information, where the first information includes a first power control parameter and a first threshold; The processing unit is used to determine the first power according to the first parameter and the first threshold; The transceiver unit is further configured to send an access message at the first power; The first parameter includes at least one of the first power control parameter and a power control adjustment value.

25. The device according to claim 24, characterized in that The processing unit is specifically used for: In a case where the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, When the first value is less than the first threshold, determining the first power by the first power control parameter; The first value is determined according to at least one parameter of the first parameters.

26. The device according to claim 24 or 25, characterized in that The transceiver unit is also used for: receiving a switching condition from the first communication device to the second communication device; The transceiver unit is specifically used for: When it is determined that the switching condition is met, sending the access message at the first power; The transceiver unit is further configured to receive at least one transmission power control command from the first communication device; The processing unit is further configured to determine the power control adjustment value according to the at least one transmission power control command.

27. The device according to any one of claims 24 to 26, characterized in that The first power control parameter includes at least one of the following: The expected power of the PUSCH sent by the terminal device and the path loss compensation factor.

28. A communication device, characterized in that: The device comprises a transceiver unit, The transceiver unit is used to send first information, the first information includes a first power control parameter and a first threshold, the first power control parameter is used to determine a first parameter, and the first parameter and the first threshold are used to determine a first power for a terminal device to send an access message to a second communication device; The first parameter includes at least one of the first power control parameter and a power control adjustment value.

29. The device according to claim 28, characterized in that The first parameter and the first threshold are used to determine a first power at which the terminal device sends an access message to the second communication device, including: In a case where the first value is greater than or equal to the first threshold, the first power is determined by the first power control parameter and the power control adjustment value, or, In a case where the first value is less than the first threshold, the first power is determined by the first power control parameter; The first value is determined according to at least one parameter of the first parameters.

30. The device according to claim 28 or 29, characterized in that The transceiver unit is also used for: Sending a switching condition to the second communication device to the terminal device; Send at least one transmission power control command to the terminal device, wherein the at least one transmission power control command is used to determine the power Rate control adjustment value.

31. The device according to any one of claims 28 to 30, characterized in that The first power control parameter includes at least one of the following: The expected power of the PUSCH sent by the terminal device and the path loss compensation factor.

32. A communication device, characterized in that: The device comprises a transceiver unit, The transceiver unit is used to receive a second parameter, where the second parameter is determined according to the second information; The transceiver unit is further configured to send an access message at the first power, where the first power is determined according to the second parameter; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

33. The device according to claim 32, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first power.

34. The device according to claim 32 or 33, characterized in that The second information also includes any one of the following: a measurement report of the device and configuration information for determining a path loss value between the first communication device and the device, and the second power.

35. The device according to claim 32 or 33, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; The first reference signal reception power is the reception power of the reference signal received by the device from the first communication device, the second reference signal reception power is the reception power of the reference signal received by the device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the device.

36. The device according to any one of claims 32 to 35, characterized in that If the second information includes the third parameter, the third parameter is determined according to the power control parameter corresponding to the second communication device and the second power control parameter.

37. A communication device, characterized in that: The device comprises a transceiver unit, The transceiver unit is used to send second information; The transceiver unit is further used to receive a second parameter, where the second parameter is determined according to the second information, and the second parameter is used to determine a first power at which the terminal device sends an access message to the second communication device; Sending the second parameter to the terminal device; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

38. The device according to claim 37, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first power.

39. The device according to claim 37 or 38, characterized in that The second information also includes any one of the following: A measurement report of a terminal device and configuration information for determining a path loss value between the apparatus and the terminal device, and the second power.

40. The device according to claim 37 or 38, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; Among them, the first reference signal reception power is the reception power of the reference signal received by the terminal device from the device, the second reference signal reception power is the reception power of the reference signal received by the terminal device from the second communication device, the first path loss value represents the path loss value of the reference signal sent by the device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the second communication device to the terminal device.

41. The device according to any one of claims 37 to 40, characterized in that If the second information includes the third parameter, the transceiver unit is further configured to: receiving third information, wherein the third information includes a power control parameter corresponding to each candidate cell in at least one candidate cell; The device also includes a processing unit, which is configured to process the target cell according to the power control parameter corresponding to the target cell and the second power control The third parameter is determined by a control parameter, and the target cell is one of the at least one candidate cell.

42. A communication device, characterized in that: The device comprises a transceiver unit, The transceiver unit is used to receive second information from the first communication device; The transceiver unit is further used to send a second parameter to the terminal device, where the second parameter is determined according to the second information, and the second parameter is used to determine a first power at which the terminal device sends an access message to the second communication device; The second information includes a second power control parameter and / or a third parameter, the second power control parameter is used to determine the second power of the uplink physical shared channel PUSCH sent by the terminal device to the first communication device, and the third parameter is used to determine the second parameter, and the third parameter is determined based on the second power control parameter.

43. The device according to claim 42, characterized in that The second parameter is a first power control parameter; or, The second parameter includes a third power control parameter used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first power.

44. The device according to claim 42 or 43, characterized in that The second information also includes any one of the following: The measurement report of the terminal equipment and the configuration information for determining the path loss value between the first communication device and the terminal equipment, and the second power.

45. The device according to claim 42 or 43, characterized in that The second information also includes any one of the following: a difference between the first reference signal received power and the second reference signal received power, and a difference between the first path loss value and the second path loss value; Among them, the first reference signal reception power is the reception power of the reference signal received by the terminal device from the first communication device, the second reference signal reception power is the reception power of the reference signal received by the terminal device from the device, the first path loss value represents the path loss value of the reference signal sent by the first communication device to the terminal device, and the second path loss value represents the path loss value of the reference signal sent by the device to the terminal device.

46. ​​The device according to any one of claims 42 to 45, characterized in that If the second information includes the third parameter, the device transceiver unit is further used for: Sending third information to the first communication device, the third information including a power control parameter corresponding to each candidate cell in at least one candidate cell, the at least one candidate cell including a target cell, the third parameter being determined based on the power control parameter corresponding to the target cell and the second power control parameter.

47. A communication device, characterized in that: The communication device is used to execute the communication method according to any one of claims 1 to 23.

48. A communication device, characterized in that: The communication device comprises: a processor and a memory; the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory, so that the communication device executes the communication method according to any one of claims 1 to 23.

49. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is caused to execute the communication method according to any one of claims 1 to 23.

50. A chip system, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a communication device equipped with the chip system executes a communication method as claimed in any one of claims 1 to 23.

51. A communication system, characterized in that: The invention comprises a terminal device and a first communication apparatus, wherein the terminal device is used to execute the communication method according to any one of claims 1 to 4, and the first communication apparatus is used to execute the communication method according to any one of claims 5 to 8.

52. A communication system, characterized in that: It includes a terminal device, a first communication device and a second communication device, the terminal device is used to execute the communication method described in any one of claims 9 to 13, the first communication device is used to execute the communication method described in any one of claims 14 to 18, and the first communication device is used to execute the communication method described in any one of claims 19 to 23.

53. A computer program product, characterized in that It comprises a computer program which, when being executed, causes the method according to any one of claims 1 to 23 to be performed.

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