Power control method and device

Abstract

The invention provides a power control method and device. The method can be applied to a random access channel-less (RACH-less) switching scene, and the method comprises the following steps: the terminal equipment receives first information, and the first information comprises a first power control parameter and a first threshold value; determining first power according to a first parameter and the first threshold value; 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 the first power according to the first parameter and the first threshold value, the power of sending the access message by the terminal equipment can be flexibly controlled, so that the switching interruption time delay can be reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and more specifically, to a power control method and device. Background Art

[0002] Compared with traditional mobile communication systems, satellite communication systems have a wider coverage range, support asymmetric transmission links, and the communication cost is independent of the 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 on the ground where the base station provides services to the UE 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 switch cells. During the cell switching process, the UE needs to send an access message to access the access network equipment that serves the target cell. How to control the power of sending the access message to reduce the switching interruption delay is a problem that needs to be considered. Summary of the invention

[0003] The embodiments of the present application provide a power control method and device, which can flexibly control the power of a terminal device to send an access message, thereby reducing a switching interruption delay.

[0004] In a first aspect, a power control method is provided, which can be applied to a random access channel less (RACH-less) switching scenario, and the method can be executed by a terminal device, or by a chip or circuit configured in the terminal device, which is not limited in this application. The following is an example of execution by a terminal device for explanation.

[0005] 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 according to 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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 of the terminal device to send PUSCH, and a path loss compensation factor.

[0010] In a second aspect, a power control method is provided, which can be applied to a random access channel less (RACH-less) switching scenario, and the method can be performed by a first communication device, and 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 is an explanation of the method performed by the second communication device.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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 the PUSCH, and a path loss compensation factor.

[0015] In a third aspect, a power control method is provided, which can be applied to a random access channel less (RACH-less) switching scenario, and the method can be executed by a terminal device, or by a chip or circuit configured in the terminal device, which is not limited in this application. The following is an example of execution by a terminal device.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In combination with the third aspect, in certain implementations of the third aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a 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.

[0020] 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 a power control parameter corresponding to the target cell and the second power control parameter.

[0021] In a fourth aspect, a power control method is provided, which can be applied to a random access channel less (RACH-less) switching scenario, and 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, which is not limited in this application. The following is an example of execution by the first communication device.

[0022] The method includes: a first communication device sends second information; receives a second parameter, the second parameter is determined according to the second information, and the second parameter is used to determine a first power at which a terminal device sends an access message to the second communication device; and sends 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 a second power at which the terminal device sends an uplink physical shared channel PUSCH to the first communication device, the third parameter is used to determine the second parameter, and the third parameter is determined according to the second power control parameter.

[0023] 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.

[0024] 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 a path loss value between the first communication device and the terminal device, and the second power.

[0025] In combination with the fourth aspect, in certain implementations of the fourth aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a 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.

[0026] 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.

[0027] In a fifth aspect, a power control method is provided, which can be applied to a random access channel less (RACH-less) switching scenario, and 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, which is not limited in this application. The following is an example of execution by the second communication device.

[0028] The method includes: receiving second information from a first communication device; sending a second parameter to a terminal device, the second parameter being determined based on the second information, and the second parameter being 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, the second power control parameter being used to determine a second power at which the terminal device sends an uplink physical shared channel PUSCH to the first communication device, the third parameter being used to determine the second parameter, and the third parameter being determined based on the second power control parameter.

[0029] 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.

[0030] 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.

[0031] In combination with the fifth aspect, in certain implementations of the fifth aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a 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.

[0032] 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.

[0033] In a 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 of the first power control parameter and a power control adjustment value.

[0034] 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.

[0035] 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.

[0036] 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 the PUSCH, and a path loss compensation factor.

[0037] 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 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.

[0038] 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 of the first parameters.

[0039] 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.

[0040] 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 the PUSCH, and a path loss compensation factor.

[0041] In an 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 an 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.

[0042] 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.

[0043] 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.

[0044] In combination with the eighth aspect, in certain implementations of the eighth aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a 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.

[0045] 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.

[0046] In a ninth aspect, a communication device is provided, the device comprising a transceiver unit, the transceiver unit being used to send second information; receiving a second parameter, the second parameter being determined based on the second information, the second parameter being used to determine a first power at which a terminal device sends an access message to a second communication device; the transceiver unit is further used to send 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 sends an uplink physical shared channel PUSCH to the device, the third parameter being used to determine the second parameter, the third parameter being determined based on the second power control parameter.

[0047] 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.

[0048] 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.

[0049] In combination with the ninth aspect, in certain implementations of the ninth aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a second path loss value; wherein, the first reference signal received power is a received power of a reference signal from the device received by the terminal device, the second reference signal received power is a received power of a reference signal from the second communication device received by the terminal device, the first path loss value represents a path loss value of a reference signal sent by the device to the terminal device, and the second path loss value represents a path loss value of a reference signal sent by the second communication device to the terminal device.

[0050] 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.

[0051] In the tenth aspect, a communication device is provided, which includes a transceiver unit, the transceiver unit 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 a 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.

[0052] 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.

[0053] 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.

[0054] In combination with the tenth aspect, in certain implementations of the tenth aspect, the second information also includes any one of the following items: a difference between a first reference signal received power and a second reference signal received power, and a difference between a first path loss value and a 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.

[0055] 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.

[0056] In an eleventh aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the method in the first aspect and the third aspect and any possible implementation of the first aspect and the third aspect. Optionally, the communication device also includes a memory. Optionally, the communication device also includes a communication interface, and the processor is coupled to the communication interface.

[0057] 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.

[0058] 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.

[0059] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0060] In a twelfth aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the method in the second aspect and the fourth aspect and any possible implementation of the second aspect and the fourth aspect. Optionally, the communication device also includes a memory. Optionally, the communication device also includes a communication interface, and the processor is coupled to the communication interface.

[0061] 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.

[0062] 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.

[0063] In a thirteenth aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the method in the fifth aspect and any possible implementation of the fifth aspect. Optionally, the communication device also includes a memory. Optionally, the communication device also includes a communication interface, and the processor is coupled to the communication interface.

[0064] In one implementation, the communication device is a second communication device. When the communication device is a second communication device, the communication interface may be a transceiver, or an input / output interface.

[0065] 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.

[0066] In a fourteenth aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is used to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any possible implementation of the first to fifth aspects.

[0067] In the specific implementation process, the above-mentioned processor can be one or more chips, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a trigger, and various logic circuits. The input signal received by the input circuit can be received and input by a receiver, and the signal output by the output circuit can be output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiment of the present application does not limit the specific implementation of the processor and various circuits.

[0068] In a fifteenth aspect, a processing device is provided, comprising a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in any possible implementation of the first to fifth aspects.

[0069] Optionally, the number of the processors is one or more, and the number of the memories is one or more.

[0070] Optionally, the memory may be integrated with the processor, or provided separately from the processor.

[0071] 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 respectively. The embodiment of the present application does not limit the type of memory and the setting method of the memory and the processor.

[0072] It should be understood that the relevant data interaction process, such as sending indication information, can be a process of outputting indication information from the processor, and receiving capability information can be a process of receiving input capability information from the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver. Among them, the transmitter and the receiver can be collectively referred to as a transceiver.

[0073] The processing device in the fifteenth aspect may be one or more chips. The processor in the processing device may be implemented by hardware or by software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor may be a general-purpose processor implemented by reading software codes stored in a memory, which may be integrated in the processor or located outside the processor and exist independently.

[0074] In the sixteenth aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instruction), which, when executed, enables a computer to execute a method in any possible implementation of the first to fifth aspects above.

[0075] In the seventeenth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions). When the computer-readable storage medium is run on a computer, the method in any possible implementation of the first to fifth aspects above is executed.

[0076] In an eighteenth aspect, a communication system is provided, comprising the aforementioned terminal device, at least one of a first communication device and a second communication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is a schematic architecture diagram of satellite communication.

[0078] Figure 2 is a schematic diagram of a communication system applicable to an embodiment of the present application.

[0079] Figure 3 It is a schematic flow chart of a power control method provided in an embodiment of the present application.

[0080] Figure 4 It is a schematic flow chart of another power control method provided in an embodiment of the present application.

[0081] Figure 5 It is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0082] Figure 6 It is a schematic block diagram of a communication device provided in an embodiment of the present application.

[0083] Figure 7 It is a schematic block diagram of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0085] 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), 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 thGeneration, 5G) system or new wireless communication system such as New Radio (NR) or future wireless communication system.

[0086] Among them, the NTN system can also be called a satellite communication system. The NTN system refers to a communication network that uses an air or space platform as a transmission equipment relay node or base station. The air or space platform includes but is not limited to drones, hot air balloons, airplanes, satellites, etc. In addition, the NTN system can also include a high altitude platform station (HAPS) communication system.

[0087] Figure 1 1 is a schematic architecture diagram of a satellite communication system applicable to an embodiment of the present application. The satellite communication system includes satellite 101, satellite 102, satellite 103 and terminal equipment. Each satellite can provide services to the terminal equipment, such as communication services, navigation services and positioning services. The satellite can communicate wirelessly with the terminal equipment through broadcast signals, navigation signals, etc. The satellite (for example, satellite 103) can be connected to a ground station and communicate wirelessly with the ground station equipment.

[0088] Among them, the ground station can be used to provide functions similar to the gateway in the terrestrial communication system, such as establishing a connection with a terminal device, communicating with a server, etc. The ground station also has the functions of monitoring the satellite, troubleshooting, packet switching of communication data, interface protocol conversion, etc. The ground station can be a device in the core network (CN) of the existing mobile communication architecture or a device in the core network of the future mobile communication architecture, a device for connecting satellites and core networks, or a relay device for satellite communications, etc.

[0089] In addition, satellite communication systems can include transparent satellite architecture and non-transparent satellite architecture. Transparent transmission is also called bent-pipe forwarding transmission: the signal is only processed by frequency conversion, signal amplification, etc. on the satellite, and the satellite is transparent to the signal. Non-transparent transmission is also called regenerative (on-board access / processing) transmission: the satellite has some or all base station functions. For example, Figure 1 Satellites 101 and 102 in the embodiment are non-transparent satellite architectures, and satellite 103 is a transparent satellite architecture. In addition, the satellites can operate in a quasi earth-fixed mode or a satellite-fixed mode.

[0090] The terminal device mentioned in the present application may include a communication kit with wireless communication function (the kit may include an antenna, a power supply template, a cable, and a Wi-Fi module, etc.), a handheld device, a vehicle-mounted device, or other processing equipment connected to a wireless modem, and may specifically refer to user equipment (UE), access terminal, user unit, user 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 function, a satellite phone or its components, a very small aperture terminal (VSAT), a wireless modem, a machine type communication device, or other processing equipment 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, a modem, a system on a chip (SoC) or a communication platform that may include a radio frequency (RF) part, etc., which is mainly responsible for the relevant communication functions in the terminal device.

[0091] The communication device mentioned in the embodiment 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, a TRP or a 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), a vehicle network communication system, or a device that undertakes network-side functions in other communication systems.

[0092] 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.

[0093] As a possible application scenario, the NTN system may include a satellite system. According to the satellite altitude, that is, the satellite orbit altitude, the satellite system 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 a high altitude platform station (HAPS) communication system. The aerial network equipment involved in this application is not limited to the above examples.

[0094] As an example, see Figure 2(a) shows 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 may be a satellite, such as a HEO satellite, a GEO satellite, a MEO satellite or a LEO satellite, or a HAPS, etc., which is not limited here. The second network device may be a gateway (also called a ground station, an earth station, a gateway station, a gateway station), which can be used to connect the first network device and the base station. The second network device may also be a base station, which is not limited here. One or more first network devices may be connected to one or more second network devices, and one or more first network devices may be connected to one or more ground base stations through one or more second network devices, which is not limited here. In Figure 1 In the example, the communication mode of the first network device is transparent mode, that is, the first network device acts as an analog RF repeater to achieve wireless frequency conversion and amplification, and can transparently transmit or copy the signal between the base station and the terminal. For example, the signal sent by the terminal can be transparently transmitted through the first network device, forwarded by the second network device, and enter the ground base station.

[0095] The present application embodiment 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. Figure 2 (b) shows another schematic diagram of the NTN network architecture. Figure 2 In the embodiment, the communication mode of the first network device is a regeneration mode, that is, the first network device can be used 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 can be a base station carried on an artificial earth satellite or a high-altitude aircraft, for example, the base station can be an evolved base station (eNB) or a 5G base station (gNB). The second network device can forward signaling between the first network device (i.e., the base station) and the core network.

[0096] It should be noted that Figure 2 (b) shows only one first network device and one second network device. In actual use, a plurality of first network devices and / or a plurality of second network devices may be used as required. 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, which is not specifically limited in the embodiments of the present application.

[0097] As an example, see Figure 2 (c) shows another schematic diagram of the architecture of the NTN network. Figure 2(c) is taken as an example including two first network devices and two second network devices. The communication mode of the two first network devices is a regeneration mode, that is, the two first network devices can be used as base stations for wireless communication. Figure 2 The difference from (b) is that there is an inter-satellite link (ISL) between the two first network devices. Under this network architecture, different first network devices can communicate with each other and can also be connected to the same ground core network.

[0098] As an example, the first network device can also serve as a DU of the base station, separated from the CU of the ground base station, to form a CUDU distributed architecture. Figure 2 (d) shows another schematic diagram of the architecture of the NTN network. Figure 2 (d) and Figure 2 The difference of (a) is that the first network device, as the DU of the base station, can understand, process and regenerate the signal from the ground, rather than just transparently transmitting or copying it, while the ground base station only acts 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, on top of which the F1 interface signal between the DU and the CU is transmitted.

[0099] The power control method provided by the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. In the following introduction process, the method can be applied to Figure 2 Any communication system shown.

[0100] To facilitate understanding of the embodiments of the present application, the following first briefly introduces the terms and background involved in the present application.

[0101] 1. No random access channel (RACH-less) switching

[0102] RACH-less switching means that the terminal device does not need to trigger a random access process to access the target cell. Usually, the goal of RACH is to obtain the timing advance (TA) and uplink grant (UL grant) of the target cell. If the terminal device can obtain relevant 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 the switching interruption delay to a certain extent.

[0103] 2. Conditional switching (multi-round trip time, CHO)

[0104] CHO means that after receiving the CHO configuration, the terminal device continues to measure and evaluate the candidate cells, and when the switching conditions are met, it selects the corresponding cell for access. In the NTN scenario, there are two main types of CHO: time-based CHO and location-based CHO.

[0105] (1) Time-based CHO: The definition of the CHO triggering event is the 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. When the UE enters the time period, CHO is executed.

[0106] (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.

[0107] The following describes the power control method when the UE sends PUSCH. The UE can implement power control when sending PUSCH by the following formula (1):

[0108]

[0109] Among them, P PUSCH,b,f,c (i,j,q d ,l) represents the power of UE to transmit PUSCH on the uplink bandwidth part (BWP) b activated by carrier f of 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 index of the power control adjustment state; if there is no special description, 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.

[0110] P CMAX,f,c (i) represents the maximum transmission power configured for the UE to transmit the PUSCH on the transmission opportunity i of the carrier f of the 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).

[0111] 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 receiving power of the transmitted PUSCH.

[0112] is the bandwidth allocated for PUSCH transmission opportunity i of carrier f 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.

[0113] 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 )=referenceSignalPower and the difference between the reference signal received power (RSRP) of the higher layer filter, where referenceSignalPower is provided by the higher layer, the RSRP of the reference serving cell is defined in the 3GPP protocol [7, TS38.215], and the higher layer filter configuration of the reference serving cell is provided by the QuantityConfig configuration in the 3GPP protocol [12, TS38.331]; PL 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).

[0114] 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.

[0115] 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, ΔTF,b,f,c (i) = 0, Ks is provided by deltaMCS for each carrier f and uplink BWP b in serving cell c. TF,b,f,c (i) can be abbreviated as Δ.

[0116] 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 PUSCH power control adjustment state l at the activated uplink BWP b of carrier f in serving cell c and PUSCH transmission opportunity i is Among them, δ PUSCH,b,f,c The values ​​are provided in Table 7.1.1-1. It is the sum of the values ​​indicated by the UE in the Transmit power control (TPC) command, and the values ​​indicated by these TPC commands are all in the set D i The cardinality of the set is c(D i ), where TPC command is the first K of the UE at PUSCH transmission opportunity i-i0 PUSCH (i-i0)-1 symbol to PUSCH transmission opportunity i before K PUSCH The activated uplink BWP b of carrier f of serving cell c for (i) symbols 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.

[0117] In the above power control process, if the higher 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 accumulation of PUSCH power control adjustment state l to f on BWP b activated on carrier f of serving cell c. b,f,c (k,l), where k = 0, 1, ..., i. When the UE switches, the network side generally needs to reconfigure Po and α for the UE, that is, configure the P corresponding to the target cell. oAccording to the existing standards, α will cause the UE to reset the accumulated value of TPCcommand, that is, to reset f to 0. If f is 0 during RACH-less handover, the UE may send an access message (e.g., msg3, an example of PUSCH) to the target cell with a lower power, which may cause the power of msg3 received by the target cell to decrease, thereby reducing the handover success rate.

[0118] In satellite communications, when intra-satellite handover occurs, such as cell handover under a single satellite, or when the gateway or gNB connected to the ground of a single satellite 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 a handover failure.

[0119] The embodiments of the present application provide a power control method and device, which are beneficial to improving and solving the above-mentioned problems.

[0120] In order to facilitate understanding of the embodiments of the present application, the following points are explained before introducing the embodiments of the present application.

[0121] 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), and the present application does not limit its specific implementation method.

[0122] Second, the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0123] 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, to distinguish different indication information.

[0124] Fourth, in the embodiments of the present application, "used for indication" may 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 may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must carry A.

[0125] In addition, the specific indication method may 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 refer 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, different indication methods may be used for different information. In the specific implementation process, the desired 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.

[0126] Fifth, in the embodiments of the present application, descriptions such as "when...", "under..." and "if" all mean that the device will make corresponding processing under certain objective circumstances. It does not limit the time, nor does it require the device to have a judgment action when implementing it, nor does it mean that there are other limitations.

[0127] 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 or other parameters or by deduction according to the parameters indicated by the signaling. It may also be implicit indications, i.e., obtained by combining other rules or other parameters or by deduction according to the rules or relationships, or according to other parameters, or by deduction. The present application does not make specific restrictions on this.

[0128] Figure 3 3 is a schematic interactive diagram of a power control method 300 provided in the present application. The method can be applied to a RACH-less switching scenario. The method can include the following steps.

[0129] 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.

[0130] 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 the PUSCH to the second communication device.

[0131] 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 ) is used to adjust the path loss compensation factor α (denoted as α2) of the path loss value PL2 of the downlink transmission path between the terminal device and the second communication device.

[0132] 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. The serving cell may be a cell served by the first communication device, and the target cell may be a cell served by the second communication device.

[0133] 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, and the configuration may include the first power control parameter and the first threshold; alternatively, 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; alternatively, the first power control parameter and the first threshold may be carried by different downlink signalings, respectively. The present application does not limit the specific method of sending the first power control parameter and the first threshold.

[0134] Among them, the specific method in which the first communication device determines to switch the terminal device from the service cell to the target cell can refer to the existing relevant description. Exemplarily, 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 service 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 a cell switching on the terminal device, or determine to switch the terminal device from the service cell to the target cell.

[0135] S320: The terminal device determines a first power according to the first parameter and the first threshold.

[0136] The first parameter includes at least one parameter of the first power control parameter and the power control adjustment value, or the first parameter is determined by at least one parameter of the first power control parameter, or the first parameter is determined by at least one parameter of the first power control parameter and the transmission power adjustment value.

[0137] The following is combined with a specific example, taking the first parameter as a different parameter, to illustrate the specific manner in which the terminal device determines the first power according to the first parameter and the first threshold.

[0138] Example 1: The first parameter is a power control adjustment value (denoted as f1).

[0139] The power control adjustment value f1 may be used to adjust the PUSCH power 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.

[0140] Specifically, the f1 may be the accumulation of the value indicated by a TPC command; or, the f1 may be the accumulation of the power control adjustment value determined according to multiple TPC commands. For example, in the case where the cell switching is a CHO switching, after the terminal device receives the first information, and before determining that the CHO switching condition is met to perform the cell switching, the first communication device may send at least one TPC command to the terminal device. The terminal device may determine the f1 according to the at least one TPC command (that is, the f1 is the accumulated value), or determine the f1 according to 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. The specific method for determining the power control adjustment value according to the TPC command may refer to the method for determining f1 according to the above method. b,f,c The relevant description of (i,l).

[0141] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0142] 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.

[0143] Specifically, the first power P2=P o2 +10log10(2M)+α2PL2+Δ+f1.

[0144] 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 method of α2, PL2, M, and Δ, please refer to the existing relevant description.

[0145] 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.

[0146] 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.

[0147] Specifically, the first power P2=P o2 +10log10(2M)+α2PL2+Δ, where P o2 ,α2,M,PL2,ΔRefer to the description in the case where f1 is greater than threshold #1.

[0148] 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.

[0149] Example 2: The first parameter is at least one parameter of the first power control parameters.

[0150] That is, the first parameter can be P o2 or α2.

[0151] 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.

[0152] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0153] 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. The specific determination method refers to the case where f1 is less than threshold #1.

[0154] When the first parameter is less than threshold #2, the first power can be determined according to 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 refers to the case where f1 is greater than threshold #1.

[0155] Similarly, the embodiment of the present application does not limit the case where the first parameter is equal to threshold #2.

[0156] It can be 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.

[0157] Example three: The first parameter is determined by at least one parameter of the first power control parameter and the power control adjustment value.

[0158] Exemplarily, the first parameter (denoted as P0) can be expressed as: P0=P o2 +10log10(2M)+α2PL2+Δ+f1.

[0159] Among them, P o2 , α2 is an example of the first power control parameter, M, PL2, Δ can refer to the description in the case where f1 is greater than threshold #1.

[0160] The terminal device determining the first power according to the first parameter and the first threshold may include:

[0161] 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. The specific determination method refers to the case where f1 is less than threshold #1.

[0162] When the first parameter is less than threshold #3, the first power can be determined according to 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 refers to the case where f1 is greater than threshold #1.

[0163] Similarly, the embodiment of the present application does not limit the case where the first parameter is equal to threshold #3.

[0164] 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.

[0165] Exemplarily, if the cell switching is a 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.

[0166] In the RACH-less handover scenario, the access message may be a msg3 message, that is, the terminal device sends a msg3 message for accessing the second communication device to the second communication device at the first power in the target cell.

[0167] Optionally, the method further includes: the second communication device sends an acknowledgement (ACK) message to the terminal device, indicating that the terminal device has switched successfully.

[0168] 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.

[0169] The first communication device and the second communication device mentioned above may be different nodes in the NTN communication scenario, and the first communication device and the second communication device may be used to carry part or all of the functions of the gNB; optionally, the first communication device and the second communication device may be different gNBs or ground stations in the NTN communication scenario. Taking the satellite communication scenario as an example, the first communication device may be the first satellite, and the second communication device may be the second satellite; or, the first communication device may be different ground stations or ground gNBs corresponding to the satellite for accessing the ground network.

[0170] Figure 4 4 is a schematic interactive diagram of another power control method 400 provided in the present application. The method can be applied to a RACH-less switching scenario. The method can include the following steps.

[0171] S410: The first communication device sends second information to the second communication device. Correspondingly, the second communication device receives the second information from the first communication device.

[0172] 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 sends a PUSCH to the first communication device.

[0173] 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 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, 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 the present application.

[0174] 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 an instruction) or data sent by the first communication device.

[0175] Optionally, the second information may also include configuration information for determining the second power control parameters, 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.

[0176] Optionally, the second information further includes any one of the following:

[0177] 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.

[0178] The measurement report of the terminal device may be obtained by measuring at least one candidate cell based on the measurement configuration information, and the at least one candidate cell includes the target cell; the configuration information for determining PL1 may be, for example, referenceSingnalPower, high-level filtered RSRP. The second power is the power of the terminal device to send 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.

[0179] Furthermore, the second information also includes any one of the following:

[0180] 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;

[0181] 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.

[0182] 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. Among them, 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.

[0183] 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 according to 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.

[0184] In the case where the second information includes the third parameter, before the first communication device sends the second information, the method includes:

[0185] 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.

[0186] 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).

[0187] 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.

[0188] 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 a difference between Po0 and Po1 (or an absolute value of the difference, denoted as ΔPo), and a difference between α0 and α1 (or an absolute value of the difference, denoted as Δα).

[0189] 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.

[0190] Optionally, the method further includes S420a or S420b:

[0191] 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.

[0192] 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.

[0193] 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 parameter 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.

[0194] 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.

[0195] 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.

[0196] Among them, P o2 And α2 is determined based on the second information.

[0197] 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 satisfies a preset condition (for example, greater than or equal to a threshold).

[0198] Optionally, the second parameter may further include a power adjustment parameter (denoted as β), which is determined based on the second information, and the power adjustment parameter may be used to adjust the power (third power) determined based on the first power control parameter to the first power.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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 PUSCH to the second communication device. The first communication device may send the first indication information and / or the power adjustment parameter to the terminal device.

[0203] 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.

[0204] 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 adjustment of Po2.

[0205] The first indication information may be determined based on the second information. The first indication information is used to indicate whether the first power is determined 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 the first power is adjusted based on the power control adjustment value when the first power is determined based on the first power control parameter.

[0206] Exemplarily, the first indication information is configured by reset-disable. When reset-disable takes the value of "0" or "1", it indicates that the first power is determined based on the first power control parameter and the power control adjustment value, or 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), respectively; 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).

[0207] Optionally, the second parameter may include the first power control parameter, a power adjustment parameter β and the first indication information.

[0208] 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, the first power is not determined based on the power control adjustment value), the terminal device may also adjust the first power based on the power adjustment value.

[0209] The power adjustment value and the first indication information may be carried in RRCreconfiguration, MAC CE or DCI signaling respectively or simultaneously, or may be sent separately, and this application does not impose any limitation on this.

[0210] For example, when it is a configured grant under RACH-less, 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.

[0211] The following takes the simultaneous sending of the first indication information and the power adjustment value as an example to introduce the sending method of 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:

[0212]

[0213]

[0214] The handover command may be in the RRC reconfiguration or may be sent separately, and the handover command may be sent in the form of RRC / MAC CE / DCI signaling. Therefore, the first indication information and the power adjustment value may also be sent in the handover command, and this application does not impose any limitation thereon.

[0215] Exemplarily, the second communication device may configure the first indication information and the power adjustment value through P0-PUSCH-AlphaSet, and indicate 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:

[0216]

[0217] The relevant parameters may also be configured in P0-PUSCH-Set-r16 / SRI-PUSCH-PowerControl, which is not limited in this application.

[0218] 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.

[0219] 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.

[0220] For details of this step, please refer to the description in S330.

[0221] In the present application, when configuring RACH-less switching related parameters, the first communication device and / or the second communication device may also choose to configure power-ramping-enable and send it to the terminal device at the same time. At the same time, the power boost value (powerRampingStep) and the maximum number of retransmissions (TransMax) may also be sent. Among them, power-ramping-enable indicates whether the UE can perform a power boost (power ramping) operation after the first failure to send PUSCH. For example, when power-ramping-enable = 1, it can indicate that the terminal device can increase the transmission power through powerRampingStep for retransmission when the first PUSCH fails to send.

[0222] Above, combined Figure 3 and Figure 4 The power control method provided by the embodiment of the present application is described in detail. Figures 5 to 7 The communication device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and will not be repeated here for the sake of brevity.

[0223] Figure 5 A schematic diagram of a communication device 500 provided in an embodiment of the present application is shown. The device 500 includes a transceiver unit 510, which can be used to implement corresponding communication functions, and the transceiver unit 510 can also be called a communication interface or a communication unit.

[0224] Optionally, the device 500 may further include a processing unit 520, which may be used to perform data processing.

[0225] Optionally, the device 500 also includes a storage unit, which can be used to store instructions and / or data, and the processing unit 520 can read the instructions and / or data in the storage unit so that the device implements the actions of different devices in the aforementioned method embodiments.

[0226] In a possible design, the apparatus 500 may be the terminal device in the aforementioned embodiment, or may be a component (such as a chip) of the terminal device. The apparatus 500 may implement the steps or processes executed by the terminal device in the above method embodiment. The transceiver unit 510 may be used to perform the operations related to the transceiver of the terminal device in the above method embodiment, such as Figure 3 to Figure 4 The processing unit 520 may be used to perform the processing-related operations of the terminal device in the above method embodiment, such as Figure 3 to Figure 4The processing-related operations of the terminal device in the illustrated embodiment.

[0227] In another possible design, the device 500 may be the first communication device in the aforementioned embodiment, or may be a component (such as a chip) of the first communication device. The device 500 may implement the steps or processes performed by the first communication device in the above method embodiment. The transceiver unit 510 may be used to perform the operations related to the transceiver of the first communication device in the above method embodiment, such as Figure 3 to Figure 4 The processing unit 520 may be used to perform the processing-related operations of the first communication device in the above method embodiment, such as Figure 3 to Figure 4 The processing-related operations of the first communication device in the illustrated embodiment.

[0228] In another possible design, the device 500 may be the second communication device in the aforementioned embodiment, or may be a component (such as a chip) of the second communication device. The device 500 may implement the steps or processes performed by the second communication device in the above method embodiment. The transceiver unit 510 may be used to perform the operations related to the transceiver of the second communication device in the above method embodiment, such as Figure 3 to Figure 4 The processing unit 520 may be used to perform the processing-related operations of the second communication device in the above method embodiment, such as Figure 3 to Figure 4 The processing-related operations of the second communication device in the illustrated embodiment.

[0229] Figure 6 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, and the processor 610 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, and 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, so as to execute the methods in the above method embodiments.

[0230] Optionally, there are one or more processors 610 .

[0231] Optionally, the memory 620 is one or more.

[0232] Optionally, the memory 620 is integrated with the processor 610 or is separately provided.

[0233] Alternatively, if Figure 6 As shown, the device 600 further includes a transceiver 630, which is used to receive and / or send signals. For example, the processor 610 is used to control the transceiver 630 to receive and / or send signals.

[0234] As a solution, the apparatus 600 is used to implement the operations performed by the terminal device in each of the above method embodiments.

[0235] For example, the processor 610 is used to execute the computer program or instructions stored in the memory 620 to implement the relevant operations of the terminal device in the above various method embodiments. Figure 3 to Figure 4 The method executed by the terminal device in the illustrated embodiment.

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

[0237] For example, the processor 610 is configured to execute the computer program or instructions stored in the memory 620 to implement the relevant operations of the first communication device in each of the above method embodiments. Figure 3 to Figure 4 The method is performed by the first communication device in the illustrated embodiment.

[0238] As another solution, the device 600 is used to implement the operations performed by the second communication device in the above method embodiments.

[0239] For example, the processor 610 is configured to execute the computer program or instructions stored in the memory 620 to implement the relevant operations of the second communication device in each of the above method embodiments. Figure 3 to Figure 4 The method is performed by the second communication device in the illustrated embodiment.

[0240] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor 610 or an instruction in the form of software. The method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in the processor for execution. The software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory 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 conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0241] It should be understood that in the embodiments of the present application, the processor may be one or more integrated circuits for executing related programs to execute the embodiments of the methods of the present application.

[0242] The 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), a gating logic, a transistor logic, a discrete hardware circuit, a processing circuit or other suitable hardware, firmware and / or a combination of hardware and software for performing the various functions described in the present disclosure. The processor may be a general-purpose processor or a dedicated processor. For example, processor 610 may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data. The central processing unit may be used to enable the device to execute a software program and process data in the software program. In addition, a portion of the processor may also include a non-volatile random access memory. For example, the processor may also store information about the type of device.

[0243] Program in this application is used to refer to software in a broad sense. Non-limiting examples of software include: program code, program, subroutine, instruction, instruction set, code, code segment, software module, application, or software application, etc. The program can be run in a processor and / or computer. So that the device performs various functions and / or processes described in this application.

[0244] 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 dynamic random access memory (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, remote mounted storage, local or remote storage 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.

[0245] 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 in 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).

[0246] Figure 7 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 .

[0247] Among them, the logic circuit 710 can be a processing circuit in the chip system 700. The logic circuit 710 can be coupled to the storage unit and call the instructions in the storage unit so that the chip system 700 can implement the methods and functions of each embodiment of the present application. The input / output interface 720 can 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.

[0248] As a solution, the chip system 700 is used to implement the operations performed by the terminal device in the above method embodiments.

[0249] For example, the logic circuit 710 is used to implement the processing-related operations performed by the terminal device in the above method embodiment, for example, Figure 3 as well as Figure 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 embodiment, for example, Figure 4 as well as Figure 7 The terminal device in the illustrated embodiment performs operations related to sending and / or receiving.

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

[0251] For example, the logic circuit 710 is used to implement the processing-related operations performed by the first communication device in the above method embodiment, for example, Figure 3 as well as Figure 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 embodiment, for example, Figure 3 as well as Figure 4 The first communication device in the illustrated embodiment performs operations related to sending and / or receiving.

[0252] As another solution, the chip system 700 is used to implement the operations performed by the second communication device in the above method embodiments.

[0253] For example, the logic circuit 710 is used to implement the processing-related operations performed by the second communication device in the above method embodiment, for example, Figure 3 as well as Figure 4 The processing-related operations performed by the second communication device in the embodiment shown; 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 embodiment, for example, Figure 3 as well as Figure 4The second communication device in the illustrated embodiment performs operations related to sending and / or receiving.

[0254] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions 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 are stored.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] In the several embodiments provided in the present 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 units is only a logical function division. There may be other division methods in actual implementation, such as 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.

[0259] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement the solution provided by this application.

[0260] In addition, each functional unit in each embodiment of the present application may be integrated into one unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0261] Those of ordinary skill 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 to be beyond the scope of this application.

[0262] 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 loading and executing computer program instructions 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 instruction can be stored in a computer-readable storage medium, or transmitted from a computer-readable storage medium to another computer-readable storage medium, for example, the computer instruction can be transmitted from a website site, a computer, a server or a data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. About computer-readable storage medium, it can be described with reference to the above.

[0263] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope 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 used to determine a third power and / or a power adjustment parameter used to adjust the third power to the first 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 communication device is used to execute the communication method according to any one of claims 1 to 23.

25. 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.

26. 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.

27. 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.

28. 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.

29. 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.

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