Communication method and device

Abstract

The invention provides a communication method and device, and relates to the technical field of communication. The method comprises the steps that the terminal equipment acquires a first parameter; the first parameter is used for indicating the maximum proportion of the uplink transmission duration in the first period, and the period length of the first period is determined according to an electromagnetic energy absorption ratio SAR standard. And the terminal equipment executes first frequency division duplex (FDD) uplink transmission by adopting the first transmitting power. The first transmit power is determined according to the first parameter. Wherein the proportion indicated by the first parameter can be the maximum proportion of the duration of FDD uplink transmission in the first period.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0002] In communication systems, electromagnetic radiation is usually measured by specific absorption rate (SAR). For example, electromagnetic radiation is reduced by reducing the transmit power of terminal equipment, so that the electromagnetic radiation of the terminal equipment meets the SAR standard.

[0003] However, for frequency division duplex (FDD) transmission, the related art does not provide a solution for determining the transmit power. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a communication method and apparatus, which enables a terminal device to determine the transmit power of a frequency division duplex (FDD) uplink transmission, and the transmit power of the FDD uplink transmission meets the specific absorption ratio (SAR) standard, thereby helping to ensure the flexibility of the FDD uplink transmission.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In the first aspect, a communication method is provided, which can be executed by a terminal device. The terminal device can refer to the terminal device itself, or a processor, module, chip, or chip system in the terminal device that implements the method. The method includes: obtaining a first parameter; the first parameter is used to indicate the maximum proportion of the duration of the uplink transmission in the first cycle, and the cycle length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard. A first frequency division duplex FDD uplink transmission is performed using a first transmission power; the first transmission power is determined according to the first parameter.

[0007] The first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, including: the first parameter is used to indicate the maximum proportion of the duration of FDD uplink transmission in the first cycle.

[0008] That is, for the first FDD uplink transmission, the terminal device can determine the first transmit power according to the acquired first parameter. Since the proportion indicated by the first parameter is the maximum proportion of the uplink transmission duration in the first cycle, and the period length of the first cycle is determined according to the SAR standard, the terminal device can know 'a maximum proportion of the FDD uplink transmission duration within a configuration period range determined based on the SAR standard', rather than the proportion for the time division duplex TDD frame structure.

[0009] In this way, when the terminal device performs the first FDD uplink transmission, it can determine the first transmission power that meets the SAR standard, so that the terminal device can flexibly perform FDD transmission, which not only meets the transmission power required by the SAR standard but also ensures the flexibility of FDD uplink transmission.

[0010] In one possible design, the method further includes: determining a power backoff amount based on the first parameter. The power backoff amount is used to determine the first transmit power.

[0011] That is, the terminal device determines the power backoff amount of the first transmit power according to the first parameter. Since the first parameter is determined according to the SAR standard, the power backoff amount determined based on the first parameter can make the first transmit power meet the SAR standard, thereby ensuring that the terminal device can flexibly perform FDD uplink transmission.

[0012] In one possible design, determining a power backoff amount based on the first parameter includes: determining the power backoff amount based on the first parameter and a current power level of the terminal device.

[0013] That is to say, in the process of determining the power backoff amount, the terminal device refers to the current power level in addition to the first parameter, which helps to improve the accuracy of the power backoff amount.

[0014] In one possible design, determining the power backoff amount according to the first parameter and the current power level of the terminal device includes: determining the power backoff amount according to the first parameter and the second parameter, and the current power level of the terminal device. Wherein, the second parameter indicates the maximum transmit power of the terminal device.

[0015] That is to say, in the process of determining the power backoff amount, the terminal device refers to the second parameter and the current power level in addition to the first parameter, which helps to improve the accuracy of the power backoff amount.

[0016] In one possible design, the proportion indicated by the first parameter is greater than a first ratio threshold, and the power indicated by the second parameter is less than or equal to a first power value.

[0017] If the current power level of the terminal device is the first level, the power backoff amount is the first value.

[0018] If the current power level of the terminal device is the second level, the power backoff amount is a second value.

[0019] For example, the first ratio threshold is 50%, the first power value is 23dBm, the first level is power level PC2, the second level is PC1.5, the first value is 3dB, and the second value is 6dB.

[0020] In one possible design, the proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold. The power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value.

[0021] The current power level of the terminal device is the second level, and the power backoff amount is the third value.

[0022] For example, the first ratio threshold is 50%, the second ratio threshold is 25%, the first power value is 23dBm, the second power value is 26dBm, the second level is PC1.5, and the third value is 6dB.

[0023] In one possible design, the power backoff amount is determined based on the first parameter and the second parameter, and the current power level of the terminal device, including: determining the power backoff amount based on the first parameter, the second parameter and the current power level of the terminal device, and the first capability.

[0024] Among them, the first capability indicates the maximum time proportion of the terminal device performing uplink transmission at a first power level in a first frequency band while meeting the SAR standard.

[0025] The uplink transmission involved in the first capability may include FDD uplink transmission or time division duplex TDD uplink transmission, without limitation.

[0026] That is to say, in the process of determining the power backoff amount, the terminal device not only refers to the first parameter, the second parameter, and the current power level of the terminal device, but also refers to the first capability, which helps to improve the accuracy of the power backoff amount.

[0027] In one possible design, the frequency of the first frequency band is less than a first frequency threshold, and the first power level is level 1. The proportion indicated by the first parameter is greater than the proportion indicated by the first capability. The power indicated by the second parameter is less than or equal to the first power value.

[0028] If the current power level of the terminal device is the first level, the power backoff amount is a fourth value.

[0029] If the current power level of the terminal device is the second level, the power backoff amount is the fifth value.

[0030] For example, the first frequency threshold is 6000 MHz. The first frequency band may be a low frequency FR1 band. The first power value is 23 dBm. The first level is PC2, and the second level is PC1.5. The fourth value is 3 dB, and the fifth value is 6 dB.

[0031] In one possible design, the frequency of the first frequency band is less than a first frequency threshold, and the first power level is a second level. The proportion indicated by the first parameter is greater than a first proportion threshold, and the proportion indicated by the first parameter is greater than the proportion indicated by the first capability. The power indicated by the second parameter is less than or equal to the first power value.

[0032] If the current power level of the terminal device is the first level, the power backoff amount is the sixth value. Or,

[0033] If the current power level of the terminal device is the second level, the power backoff amount is the seventh value.

[0034] For example, the first frequency threshold is 6000 MHz. The first frequency band may be a low frequency FR1 band. The first power value is 23 dBm. The first level is PC2, and the second level is PC1.5. The sixth value is 3 dB, and the seventh value is 6 dB. The first ratio threshold is 50%.

[0035] In one possible design, the frequency of the first frequency band is less than a first frequency threshold, and the first power level is a first level.

[0036] The first capability also indicates a maximum time proportion for the terminal device to perform uplink transmission at the first power level in a second frequency band when the SAR standard is met. The frequency of the second frequency band is greater than a second frequency threshold.

[0037] The proportion indicated by the first parameter is greater than the proportion of time when the first frequency band performs uplink transmission indicated by the first capability, and the proportion indicated by the first parameter is less than the proportion of time when the second frequency band performs uplink transmission indicated by the first capability. The power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value.

[0038] The current power level of the terminal device is the second level, and the power backoff amount is the fifteenth value.

[0039] For example, the first frequency threshold is 6000 MHz. The first frequency band may be a low frequency FR1 band. The second frequency threshold is 24250 MHz. The second frequency band may be a high frequency FR2 band. The first power value is 23 dBm, and the second power value is 26 dBm. The first level is PC2, and the second level is PC1.5. The fifteenth value is 3 dB.

[0040] In one possible design, the frequency of the first frequency band is less than a first frequency threshold, and the first power level is a second level.

[0041] The proportion indicated by the first parameter is greater than the proportion indicated by the first capability. The power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value.

[0042] The current power level of the terminal device is the second level, and the power backoff amount is the eighth value.

[0043] For example, the first frequency threshold is 6000 MHz. The first frequency band may be a low frequency FR1 band. The first power value is 23 dBm, and the second power value is 26 dBm. The second level is PC1.5. The eighth value is 3 dB.

[0044] In one possible design, the method also includes: sending a capability parameter, where the capability parameter is used to indicate the first capability, so that the network device side determines the first parameter based on the capability parameter, so that the first parameter better matches the capability of the terminal device.

[0045] In one possible design, the first cycle includes N sub-cycles, and each sub-cycle of the N sub-cycles allows the terminal device to perform FDD uplink transmission.

[0046] Determining a power backoff amount according to the first parameter includes: under a first condition, determining that the power backoff amount is zero.

[0047] The first condition includes: the terminal device does not perform the first FDD uplink transmission within N1 sub-periods of the N sub-periods, and the sub-periods configured for the first FDD uplink transmission in the N sub-periods do not exceed N2 sub-periods. N, N1 and N2 are positive integers, the sum of N1 and N2 is less than or equal to N, and each sub-period in the N1 sub-periods is earlier than each sub-period in the N2 sub-periods.

[0048] That is to say, compared with the first cycle, the granularity of the sub-cycle is smaller. In this way, due to the introduction of the sub-cycle, the terminal device can adjust the transmit power of the first FDD uplink transmission within a smaller granularity time range, thereby achieving a more refined transmit power adjustment range. In addition, in the first condition, the data scheduling situation is taken into account, which helps to improve the accuracy of the first power backoff amount, making the transmit power of the first FDD uplink transmission more accurate.

[0049] In one possible design, the power indicated by the second parameter is less than or equal to the first power value.

[0050] When the proportion indicated by the first parameter is greater than the first proportion threshold and less than the third proportion threshold,

[0051] If the current power level of the terminal device is the first level, the power backoff amount is the ninth value. Or,

[0052] If the current power level of the terminal device is the second level, the power backoff amount is the tenth value.

[0053] When the proportion indicated by the first parameter is greater than or equal to the third proportion threshold and less than the fourth proportion threshold,

[0054] If the current power level of the terminal device is the first level, the power backoff amount is the eleventh value. Or,

[0055] If the current power level of the terminal device is the second level, the power backoff amount is the twelfth value.

[0056] For example, the first ratio threshold is 50%, the third ratio threshold is 75%, and the fourth ratio threshold is 100%. The first power value is 23dBm. The first level is PC2, and the second level is PC1.5. The ninth value is 1.5dB, and the tenth value is 3dB. The eleventh value is 3dB, and the twelfth value is 6dB.

[0057] In one possible design, the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value.

[0058] When the proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the fifth proportion threshold, the current power level of the terminal device is the second level, and the power backoff amount is the thirteenth value.

[0059] When the proportion indicated by the first parameter is greater than the fifth proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold, and the current power level of the terminal device is the second level, the power backoff amount is the fourteenth value.

[0060] For example, the first ratio threshold is 50%, the second ratio threshold is 25%, and the fifth ratio threshold is 37.5%. The first power value is 23dBm, the second power value is 26dBm. The second level is PC1.5. The thirteenth value is 3dB, and the fourteenth value is 6dB.

[0061] In one possible design, determining the power backoff amount according to the first parameter includes: determining the power backoff amount according to the first parameter and a signal type of an uplink signal. The uplink signal is sent via the first FDD uplink transmission to increase the possibility of successful transmission of the uplink signal, which helps to ensure the performance of some types of uplink signals.

[0062] In one possible design, the signal type of the uplink signal is a random access request, and the power backoff amount is zero.

[0063] In a possible design, the starting position of the first cycle is the starting position of a random access channel opportunity RO. Alternatively, there is a first offset between the starting position of the first cycle and the starting position of the RO. The RO is the opportunity for the terminal device to initiate a random access request.

[0064] In one possible design, the first parameter is carried by at least one of the following: radio resource control RRC signaling, media access control element MAC CE, downlink control information DCI or broadcast message.

[0065] In one possible design, performing a first FDD uplink transmission with a first transmit power includes: performing a first FDD uplink transmission with a first transmit power in a first time period of the first cycle. The first time period is an overlapping time period of: a time period in the first cycle during which the FDD uplink transmission is allowed to be performed, and a duration of discontinuous reception (DRX).

[0066] That is to say, in combination with the DRX mechanism, if the time period in the first cycle during which the FDD uplink transmission is allowed to be performed overlaps with the duration of DRX, then during the overlapping time period, the first FDD uplink transmission is performed according to the first transmission power to facilitate the combination of the terminal device with the DRX mechanism.

[0067] In one possible design, the cycle length and starting position of the first cycle are configured by the network device for the terminal device, so that the network device can flexibly configure the first cycle. Alternatively, the cycle length and starting position of the first cycle are predefined to save signaling overhead.

[0068] In a second aspect, a communication method is provided, which can be executed by a network device. The network device can refer to the network device itself, or a processor, module, chip, or chip system in the network device that implements the method. The method includes: determining a first parameter; the first parameter is used to indicate the maximum proportion of the duration of the uplink transmission in the first cycle, and the cycle length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard; sending the first parameter.

[0069] For example, the first parameter is used to determine a power backoff amount, and the power backoff amount is used to determine a first transmit power, where the first transmit power is a transmit power of a first FDD uplink transmission.

[0070] In one possible design, a first parameter is determined, including: a receiving capability parameter; the capability parameter is used to indicate a first capability, and the first capability indicates the maximum time proportion of a terminal device performing uplink transmission at a first power level in a first frequency band while meeting the SAR standard; the first parameter is determined based on the capability parameter.

[0071] In one possible design, the first parameter is carried by at least one of the following: radio resource control RRC signaling, media access control element MAC CE, downlink control information DCI or broadcast message.

[0072] In one possible design, the first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, including: the first parameter is used to indicate the maximum proportion of the duration of FDD uplink transmission in the first cycle.

[0073] In a third aspect, a communication device is provided for implementing various methods. The communication device may be the terminal device in the first aspect, or a device included in the terminal device, such as a chip or a chip system. Alternatively, the communication device may be the network device in the second aspect, or a device included in the network device, such as a chip or a chip system.

[0074] The communication device includes a module, unit, or means corresponding to the implementation method, and the module, unit, or means can be implemented by hardware, software, or by hardware executing the corresponding software implementation. The hardware or software includes one or more modules or units corresponding to the functions.

[0075] In some possible designs, the communication device may include a processing module and a transceiver module. The processing module may be used to implement the processing function in any of the above aspects and any possible implementations thereof. The transceiver module may include a receiving module and a sending module, respectively used to implement the receiving function and the sending function in any of the above aspects and any possible implementations thereof.

[0076] In some possible designs, the transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.

[0077] In a fourth aspect, a communication device is provided, comprising: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method described in any aspect. The communication device can be the terminal device in the first aspect, or a device included in the terminal device, such as a chip or a chip system. Alternatively, the communication device can be the network device in the second aspect, or a device included in the network device, such as a chip or a chip system.

[0078] In a fifth aspect, a communication device is provided, comprising: a processor and a communication interface; the communication interface is used to communicate with a module outside the communication device; the processor is used to execute a computer program or instruction so that the communication device executes the method described in any aspect. The communication device can be the terminal device in the first aspect, or a device included in the terminal device, such as a chip or a chip system. Alternatively, the communication device can be the network device in the second aspect, or a device included in the network device, such as a chip or a chip system.

[0079] In a sixth aspect, a communication device is provided, comprising: at least one processor; the processor is used to execute a computer program or instruction stored in a memory, so that the communication device performs the method described in any aspect. The memory may be coupled to the processor, or may be independent of the processor. The communication device may be the terminal device in the first aspect. Alternatively, the communication device may be the network device in the second aspect.

[0080] In a seventh aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer-readable storage medium is run on a communication device, the communication device can execute the method described in the first aspect and any possible design thereof.

[0081] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a communication device, enables the communication device to execute the method described in the first aspect and any possible design thereof.

[0082] In the ninth aspect, a communication device is provided (for example, the communication device may be a chip or a chip system), which includes a processor for implementing the functions involved in the first aspect and any possible design thereof, or for implementing the functions involved in the second aspect and any possible design thereof.

[0083] In some possible designs, the communication device includes a memory for storing necessary program instructions and data.

[0084] In some possible designs, when the device is a chip system, it can be composed of a chip or include a chip and other discrete devices.

[0085] In the tenth aspect, a communication system is provided, which includes a terminal device and a network device, wherein the terminal device is used to execute the method in the first aspect or any possible design of the first aspect, and the network device is used to execute the method in the second aspect or any possible design of the second aspect.

[0086] It can be understood that when the communication device provided in any one of the third aspect to the tenth aspect is a chip, the sending action / function of the communication device can be understood as output information, and the receiving action / function of the communication device can be understood as input information.

[0087] Among them, the technical effects brought about by any design method in the second aspect to the tenth aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Figure 1 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0089] Figure 2a A satellite network architecture diagram provided for this application;

[0090] Figure 2b A satellite network architecture diagram provided for this application;

[0091] Figure 2c A satellite network architecture diagram provided for this application;

[0092] Figure 3 A flow chart of a communication method provided in an embodiment of the present application;

[0093] Figure 4 A flowchart of another communication method provided in an embodiment of the present application;

[0094] Figure 5 A flowchart of another communication method provided in an embodiment of the present application;

[0095] Figure 6 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0096] Figure 7 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0097] Figure 8 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0098] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0099] In the description of this application, unless otherwise specified, " / " indicates that the objects associated with each other are in an "or" relationship, for example, A / B can represent A or B; "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0100] In the description of this application, unless otherwise specified, "plurality" means two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc.

[0101] In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference.

[0102] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0103] It is understood that the "embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the various embodiments in the entire specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It is understood that in various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and 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 embodiment of the present application.

[0104] It can be understood that in the present application, "when" and "if" both mean that corresponding processing will be carried out under certain objective circumstances, and do not limit the time, nor do they require any judgment action when implementing, nor do they mean the existence of other limitations.

[0105] It can be understood that some optional features in the embodiments of the present application may be implemented independently in certain scenarios without relying on other features, such as the solution on which they are currently based, to solve corresponding technical problems and achieve corresponding effects, or may be combined with other features according to needs in certain scenarios. Accordingly, the devices provided in the embodiments of the present application may also realize these features or functions accordingly, which will not be elaborated here.

[0106] In this application, unless otherwise specified, the same or similar parts between the various embodiments can refer to each other. In the various embodiments in this application, and the various implementation methods / implementation methods / implementation methods in each embodiment, if there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments and the various implementation methods / implementation methods / implementation methods in each embodiment are consistent and can be referenced to each other. The technical features in different embodiments and the various implementation methods / implementation methods / implementation methods in each embodiment can be combined to form new embodiments, implementation methods, implementation methods, or implementation methods according to their inherent logical relationships. The implementation methods of this application described below do not constitute a limitation on the scope of protection of this application.

[0107] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0108] Figure 1 FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. Figure 1 As shown, the communication system 1000 includes at least one network device (such as Figure 1110a and 110b) and at least one terminal device (such as Figure 1 120a-120j in FIG. 120b). The terminal device may communicate with the network device in a wireless manner. Optionally, different network devices may communicate with each other. Optionally, different terminal devices may communicate with each other.

[0109] It should be pointed out that Figure 1 It is only a schematic diagram. Although not shown, the communication system 1000 may also include other network devices. For example, the communication system 1000 may also include one or more core network (CN) devices, wireless relay devices and wireless backhaul devices, which are not specifically limited here.

[0110] The network device may be connected to the core network device wirelessly or wiredly. The core network device and the network device may be independent and different physical devices, or the functions of the core network device and the logical functions of the network device may be integrated on the same physical device, or the functions of some core network devices and some network devices may be integrated on one physical device, which is not specifically limited in the embodiments of the present application.

[0111] Optionally, the network device is a network-side device with wireless transceiver functions. The network device may be a device in a radio access network (RAN) that provides wireless communication functions for terminal devices, referred to as a RAN device. RAN may be an access network in the third generation partnership project (3GPP), for example, 4G, 5G, or a future-oriented 6G network. RAN may also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or a communication network of two or more of the above networks. RAN equipment may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation base station (next generation nodeB, gNB) in a fifth generation (5G) mobile communication system, a next generation base station in a sixth generation (6G) mobile communication system, a base station in a future mobile communication system, a wireless fidelity (WiFi) system, a long range radio (LoRa) system, or an access node in a vehicle networking system. The RAN device may also be a module or unit that completes part of the functions of the base station, for example, it may be a centralized unit (CU), a distributed unit (DU), or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and may also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and may also complete the functions of part or all of the physical layer. For the specific description of the above-mentioned protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The CU and DU may be set separately, or may also be included in the same network element, such as the baseband unit (BBU).The RU may be included in a radio frequency device or a radio frequency unit, for example, in a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH). In different systems, CU, DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, CU may also be referred to as O-CU (open CU), DU may also be referred to as O-DU, and RU may also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. The wireless access network device may be a macro base station (eg. Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b), may also be a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For ease of description, network device is used as the abbreviation of wireless access network device, and base station is used as an example of wireless access network device.

[0112] Optionally, the terminal device accesses the core network through a network device. The terminal device includes a device that provides voice and / or data connectivity to the user, specifically, a device that provides voice to the user, or a device that provides data connectivity to the user, or a device that provides voice and data connectivity to the user. For example, it may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The terminal device can communicate with the core network via a wireless access network, exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal device may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, D2D terminal equipment, V2X terminal equipment, machine-to-machine / machine-type communications (M2M / MTC) terminal equipment, Internet of Things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user equipment, etc. For example, it may include a mobile phone (or "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA) and other devices. It also includes limited devices, such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.

[0113] The various terminal devices introduced above, if located on a vehicle (eg, placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBU).

[0114] In the embodiment of the present application, the terminal device may also include a relay. Alternatively, it can be understood that anything that can communicate data with the base station can be regarded as a terminal device.

[0115] In the embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system, which may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, the device for realizing the function of the terminal is a terminal device as an example for introduction.

[0116] It should be understood that the network equipment and terminal equipment can be fixed or movable. The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the network equipment and terminal equipment.

[0117] It is easy to understand that the technical solution of the embodiment of the present application can be used in non-terrestrial networks (NTN) systems such as satellite communication systems, high altitude platform station (HAPS) communications, and drones. In this case, the ground mobile terminal device accesses the network through the air interface, and the network equipment (such as base stations) can be deployed on the satellite, such as Figure 2b Network equipment (such as base stations) can also be deployed on the ground and connected to ground stations that communicate with satellites, such as Figure 2a As shown. The satellite is connected to the ground station via a wireless link. The ground station and the ground base station (i.e., the network equipment deployed on the ground) are connected to the core network via wired or wireless. There can be wireless links between satellites. If the satellite only has the transparent transmission and forwarding function (i.e., the corresponding network equipment is deployed on the ground), only transparent transmission and forwarding are implemented between satellites. If the network equipment or part of the network equipment functions are deployed on the satellite, the signaling interaction and user data transmission between network equipment (such as base stations) and network equipment (such as base stations) can be completed between satellites, as shown Figure 2c shown.

[0118] The roles of network devices and terminal devices can be relative. For example, Figure 1The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal devices 120j that access the wireless access network through 120i, the terminal device 120i is a network device; but for the network device 110a, 120i is a terminal device, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. At this time, relative to 110a, 120i is also a network device. Therefore, network devices and terminal devices can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having network device functions. Figure 1 120a-120j may be referred to as communication devices having terminal device functions.

[0119] Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices may communicate through authorized spectrum, unauthorized spectrum, or both; may communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0120] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem including the network device function. The control subsystem including the network device function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device including the terminal device function.

[0121] In an embodiment of the present application, a network device sends a downlink signal or downlink information to a terminal device, and the downlink information is carried on a downlink channel; the terminal device sends an uplink signal or uplink information to the network device, and the uplink information is carried on an uplink channel. In order to communicate with the network device, the terminal device needs to establish a wireless connection with the cell controlled by the network device. The cell with which the terminal device has established a wireless connection is called the service cell of the terminal device. When the terminal device communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0122] It should be noted that the solutions in the embodiments of the present application can also be applied to other communication systems, and the corresponding names can also be replaced by the names of corresponding functions in other communication systems.

[0123] In order to facilitate understanding of the embodiments of the present application, the following briefly describes the terms involved in the embodiments of the present application. It should be understood that these descriptions are only for facilitating understanding of the embodiments of the present application and should not constitute any limitation to the present application.

[0124] 1. Duplex mode

[0125] In the communication system, there are two duplex modes: frequency division duplex (FDD) and time division duplex (TDD). For FDD, uplink transmission and downlink transmission are performed on different carriers, which can be understood as uplink transmission and downlink transmission are performed on different frequency bands and can be performed simultaneously. For TDD, uplink transmission and downlink transmission are performed on different subframes on the same carrier, which can be understood as uplink transmission and downlink transmission are on the same frequency.

[0126] In the present application, FDD uplink transmission may be referred to as FDD uplink transmission, and TDD uplink transmission may be referred to as TDD uplink transmission.

[0127] It should be noted that in the present application, the following text also involves "uplink transmission", that is, FDD or TDD is not limited. In this case, uplink transmission may include TDD uplink transmission or FDD uplink transmission, which are uniformly explained here.

[0128] 2. SAR

[0129] SAR can also be called electromagnetic wave absorption ratio, electromagnetic energy absorption ratio, etc.

[0130] The electromagnetic energy incident on the human body by communication equipment (such as terminal equipment) is usually measured by SAR internationally. SAR refers to the electromagnetic energy absorbed by a unit mass of material per unit time, and the unit is watt per kilogram (W / kg).

[0131] At present, some countries have set a certain upper limit on the SAR value of communication equipment to ensure that communication equipment entering these countries will not cause excessive radio frequency (RF) radiation to the human body. The SAR upper limit refers to the maximum electromagnetic energy allowed to be absorbed per kilogram of human tissue within 6 minutes. For example, the SAR upper limit set by the Federal Communications Commission (FCC) of the United States is 1.6W / Kg, and the SAR upper limit set by the European Telecommunications Standard Institute (ESTI) is 2.0W / Kg. The SAR upper limit can also be called the SAR limit value.

[0132] In order to meet the SAR value requirements of the above countries for communication equipment, the transmission power of the communication equipment is generally controlled through a power backoff mechanism to meet the SAR standard. The power backoff mechanism refers to reducing the transmission power of the communication equipment antenna, thereby reducing the SAR value of the communication equipment.

[0133] 3. Power fallback mechanism for TDD uplink transmission

[0134] First, the relevant technical specifications define the transmit power supported by the terminal device on the TDD frequency band. If the transmit power of the terminal device is higher than 23dBm, the terminal device is a high-power terminal device, or the uplink transmission is a high-power uplink transmission. The transmit power supported by the terminal device on different frequency bands is shown in Table 1:

[0135] Table 1

[0136]

[0137]

[0138] In Table 1, NR band can be recorded as NR band. Class 1 can be recorded as Class 1. Class 1.5 can be recorded as Class 1.5. Class 2 can be recorded as Class 2. Class 3 can be recorded as Class 3. Error can be recorded as Tolerance.

[0139] It is easy to understand that in this application, if the current power class (PC) of the terminal device is class 2, it can be recorded as PC2. Similarly, if the current power class of the terminal device is class 1.5, it can be recorded as PC1.5.

[0140] Since the terminal equipment needs to meet the SAR standard, that is, the requirement for human body radiation, during the communication process, the existing standards stipulate a set of relatively strict processes to ensure that the high-power uplink sent by the terminal does not exceed a certain proportion. For high-power terminal equipment, it is necessary to follow the power fallback, that is, when the conditions are not met, the default transmission power of 23dBm is used to perform TDD uplink transmission. For example, the network equipment side can configure the maximum transmission power (such as P EMAX,c ). In the current configuration period, the terminal device determines whether the time proportion of TDD uplink transmission exceeds the threshold. If it exceeds the threshold, power backoff is performed. The power backoff amount is based on the maximum transmit power (such as P EMAX,c ) is confirmed.

[0141] In the related art, the power reduction amount is recorded as ΔP PowerClass The power fallback value is as follows:

[0142] Under any of the following conditions (i.e., at least one of the following conditions a1, a2, a3, and a4), for a terminal device whose current power level is PC2, ΔP PowerClass =3dB, for the terminal equipment with the current power level of PC1.5, ΔP PowerClass =6dB:

[0143] Condition a1, P EMAX,c 23dBm or less.

[0144] Condition a2: The terminal device does not report maxUplinkDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC1dot5-MPE-FR1, and the percentage of uplink symbols in the configuration period is greater than 50%.

[0145] Condition a3: The terminal device has reported maxUplinkDutyCycle-PC2-FR1, and the percentage of uplink symbols in the configuration period is greater than maxUplinkDutyCycle-PC2-FR1.

[0146] Condition a4: The terminal device has reported maxUplinkDutyCycle-PC1dot5-MPE-FR1, and the percentage of uplink symbols in the configuration period is greater than 50% and greater than maxUplinkDutyCycle-PC1dot5-MPE-FR1.

[0147] Under any of the following conditions (i.e., at least one of the following conditions b1, b2, b3, and b4), for a terminal device whose current power level is PC1.5, ΔPPowerClass =1.5dB:

[0148] Condition b1, P EMAX,c Between 23dBm-26dBm (which can be understood as P EMAX,c Greater than or equal to 23dBm, and P EMAX,c Less than or equal to 26dBm).

[0149] Condition b2: the terminal device does not report maxUplinkDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC1dot5-MPE-FR1, and the percentage of uplink symbols in the configuration period is between 25% and 50% (it can be understood that the percentage of uplink symbols is greater than or equal to 25%, and the percentage of uplink symbols is less than or equal to 50%).

[0150] Condition b3, the terminal device has reported maxUplinkDutyCycle-PC2-FR1, and the percentage of uplink symbols within the configuration period is between maxUplinkDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC2-FR2 (it can be understood that the percentage of uplink symbols is greater than or equal to the percentage indicated by maxUplinkDutyCycle-PC2-FR1, and the percentage of uplink symbols is less than or equal to the percentage indicated by maxUplinkDutyCycle-PC2-FR2).

[0151] Condition b4, the terminal device has reported maxUplinkDutyCycle-PC1dot5-MPE-FR1, and the percentage of uplink symbols in the configuration period is greater than maxUplinkDutyCycle-PC1dot5-MPE-FR1 (it can be understood that the percentage of uplink symbols is greater than the percentage indicated by maxUplinkDutyCycle-PC1dot5-MPE-FR1).

[0152] It should be noted that, in the present application, the period length of the configuration period is related to the frame structure of TDD, for example, the configuration period may be 10 ms, which is the length of a TDD radio frame.

[0153] In the present application, maxUplinkDutyCycle-PC2-FR1 can be understood as the maximum uplink ratio that meets the SAR requirement when the terminal device performs uplink transmission at the power level of PC2 in the FR1 frequency band.

[0154] In the present application, maxUplinkDutyCycle-PC2-FR2 can be understood as the maximum uplink ratio that meets the SAR requirement when the terminal device performs uplink transmission at the power level of PC2 in the FR2 frequency band.

[0155] In this application, maxUplinkDutyCycle-PC1dot5-MPE-FR1 can be understood as the maximum uplink ratio that meets the SAR requirement when the terminal device performs uplink transmission at a power level of PC1.5 in the FR1 frequency band.

[0156] It should be pointed out that in the present application, the uplink transmission involved in the above-mentioned capabilities (such as maxUplinkDutyCycle-PC2-FR1, maxUplinkDutyCycle-PC2-FR2, maxUplinkDutyCycle-PC1dot5-MPE-FR1) may include TDD uplink transmission or FDD uplink transmission, without limitation.

[0157] For the terminal device, the terminal device determines the power backoff amount ΔP PowerClass Afterwards, according to the power reduction amount ΔP PowerClass , determine the transmit power of TDD uplink transmission. The transmit power of TDD uplink transmission can be recorded as P CMAX,f,c , the transmit power of TDD uplink transmission satisfies the following formula (1):

[0158] P CMAX_L,f,c ≤P CMAX,f,c ≤P CMAX_H,f,c

[0159]

[0160] P CMAX_H,f,c =MIN{P EMAX,c ,P PowerClass -ΔP PowerClass}

[0161] Among them, P CMAX_L,f,c Indicates the lower limit of TDD uplink transmission power, P CMAX,f,c Indicates the actual transmit power of TDD uplink transmission, P CMAX_H,f,c Indicates the upper limit of TDD uplink transmission power.

[0162] P EMAX,c Indicates the maximum transmission power indicated by the network device to the terminal device, P PowerClass Indicates the TDD uplink transmission power corresponding to the current power level of the terminal device, ΔP PowerClass Indicates the power reduction amount. MPR cIndicates the maximum power back-off value, which is the power back-off value under different bandwidths and resource blocks (RB) allocations under the requirements of multiple radio frequency indicators. c Indicates the additional power fallback value, which can be further reduced based on the maximum output power reduction (MPR) under certain network signaling. c Indicates the power back-off value defined considering the SAR standard. ΔT IB,c represents the relaxation of transmit power considering carrier aggregation, ΔT C,c represents the relaxation of the transmit power at the band edge, ΔT RXSRS Indicates that the transmit power of the received sounding reference signal (SRS) is relaxed, MIN indicates a minimum operator, and MAX indicates a maximum operator.

[0163] It should be added that the parameters involved in formula (1) can be found in the introduction of the relevant technical specifications of 3GPP and will not be described in detail.

[0164] From formula (1), we can see that ΔP PowerClass It not only affects the upper limit of TDD uplink transmission power, but also affects the lower limit of TDD uplink transmission power.

[0165] In formula (1), the upper limit of TDD uplink transmission power (i.e., P CMAX_H,f,c ) is the smaller value of the following two parameters: the maximum power P configured on the network device side EMAX,c Subtract the power reduction amount ΔP PowerClass , the power level P supported by the terminal device PowerClass Subtract the power reduction amount ΔP PowerClass .

[0166] In formula (1), the lower limit of TDD uplink transmission power (i.e., P CMAX_L,f,c ) is the smaller value of the following two parameters: the maximum power P configured on the network device side EMAX,c The current power level P of the terminal device is the transmit power after considering various power fallback factors. PowerClass The transmit power after considering various power back-off factors. PowerClass Please refer to the introduction in Table 1, which will not be described in detail.

[0167] In summary, in the power backoff mechanism of TDD uplink transmission, the power backoff amount ΔP PowerClassIt is determined according to the frame structure and ratio of TDD (such as the percentage of uplink symbols in the configuration period). For example, in the frame structure of TDD, the frame length is 10ms. Correspondingly, the cycle length of the configuration period can be 10ms. In the configuration of TDD, the maximum proportion of uplink symbols is 50%.

[0168] However, the power reduction amount ΔP PowerClass The determination method is no longer applicable to FDD communication scenarios. The specific reasons are as follows:

[0169] In the FDD communication scenario, it is very flexible for the terminal device to perform FDD upload transmission. For example, in the SAR observation cycle, such as 6 minutes (min), the terminal device can perform 3 minutes of FDD uplink transmission and 3 minutes of FDD downlink transmission. If the TDD uplink transmission method is still used, the proportion of FDD uplink transmission performed by the terminal device within every 10ms does not exceed 50%. This means that the network equipment cannot plan FDD uplink transmission for a longer time, such as FDD uplink transmission with a duration of 3 minutes, which affects the communication performance of FDD uplink transmission.

[0170] Therefore, for FDD transmission scenarios, how to determine the transmit power of terminal equipment is a technical problem that needs to be solved urgently.

[0171] In view of this, the present application provides a communication method. The method can be applied to Figure 1 , Figure 2a , Figure 2b and Figure 2c The method includes: the terminal device obtains a first parameter. The first parameter is used to indicate the maximum proportion of the duration of the uplink transmission (such as FDD uplink transmission) in the first cycle, and the cycle length of the first cycle is determined according to the SAR standard. The terminal device uses a first transmission power to perform a first FDD uplink transmission. The first transmission power is determined according to the first parameter.

[0172] In the present application, for the first FDD uplink transmission, the terminal device can determine the first transmit power of the uplink transmission according to the acquired first parameter. Since the proportion indicated by the first parameter is the maximum proportion of the FDD uplink transmission duration in the first cycle, and the cycle length of the first cycle is determined according to the SAR standard, the terminal device can know the 'maximum proportion of the FDD uplink transmission duration within a configuration cycle range determined based on the SAR standard', rather than the proportion for the TDD frame structure.

[0173] In this way, when the terminal device performs the first FDD uplink transmission, it can determine the first transmission power that meets the SAR standard, so that the terminal device can flexibly perform FDD transmission, which not only meets the transmission power required by the SAR standard, but also ensures the flexibility of FDD uplink transmission.

[0174] Next, combine Figure 3 , the communication method proposed in the embodiment of the present application is described in detail. The communication method 300 proposed in the embodiment of the present application includes the following operations:

[0175] S301. The terminal device obtains a first parameter.

[0176] Among them, the introduction of the first parameter is as follows:

[0177] The first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, such as indicating the maximum proportion of the duration of FDD uplink transmission in the first cycle. The period length of the first cycle is determined according to the SAR standard.

[0178] For example, in the SAR standard, the SAR upper limit refers to the maximum electromagnetic energy allowed to be absorbed per kilogram of human tissue within 6 minutes. In this case, the cycle length of the first cycle can be 6 minutes. Of course, the cycle length of the first cycle can also be other time lengths, which is not limited in this application. The first cycle can be recorded as SAR Mask.

[0179] Exemplarily, the first cycle (eg, SAR Mask) includes two states: on and off.

[0180] The time period when the SAR Mask state is on can be referred to as SAR Mask on (or Mask on). During this time period, the terminal device is allowed to perform FDD uplink transmission. Accordingly, the terminal device may perform FDD uplink transmission or not, and this application does not limit this. In addition, the time period when the SAR Mask state is on can be understood as the first type of time period included in the first cycle.

[0181] The period when the SAR Mask state is off can be referred to as SAR Mask off (or Mask off). During this period, the terminal device is not allowed to perform FDD uplink transmission. Accordingly, the terminal device does not perform FDD uplink transmission during this period. In addition, the period when the SAR Mask state is off can be understood as the second type of period included in the first cycle.

[0182] In this case, the first parameter may indicate the proportion of Mask on in the SAR Mask. For example, the first parameter may be in the form of a percentage or other forms, which is not limited in this application.

[0183] It should be pointed out that in the present application, in the period corresponding to the SAR Mask, the time period corresponding to the Mask on may be continuous or discontinuous in the time domain, and the present application does not limit this.

[0184] Optionally, the cycle length and starting position of the first cycle are configured by the network device for the terminal device, which helps the network device to flexibly configure the first cycle. Alternatively, the cycle length and starting position of the first cycle are predefined, which helps to save system signaling overhead.

[0185] Optionally, the starting position of the first period is the starting position of a random access channel occasion (RO), or there is a certain offset between the starting position of the first period and the starting position of the RO, such as a first offset. The RO is the timing when the terminal device initiates a random access request. The first offset can be configured by the network device for the terminal device, or it can be predefined, and this application does not limit this.

[0186] Optionally, the implementation process of S301 includes the following two methods (the following method 1 and method 2):

[0187] Mode 1, for the first cycle at the cell level, S301 includes:

[0188] The terminal device obtains the first parameter from the first broadcast message.

[0189] For example, the network device sends a first broadcast message to the terminal device. Correspondingly, the terminal device receives the first broadcast message from the network device. The first broadcast message includes a first parameter.

[0190] In mode 1, the first period at the cell level can be understood as the network device configuring the first period according to the cell granularity. In this way, the configuration of the first period is the same for different terminal devices in the same cell. The configuration of the first period can be the same or different for terminal devices in different cells, and this application does not limit this.

[0191] That is to say, under the first period configuration at the cell level, the network device can provide the first parameter to the terminal device through the first broadcast message.

[0192] Mode 2, for the first cycle at the terminal device level, S301 includes:

[0193] The terminal device obtains the first parameter from radio resource control (RRC) signaling, a medium access control-control element (MAC-CE) or downlink control information (DCI).

[0194] For example, the network device sends RRC signaling (or MAC CE, or DCI) to the terminal device. Correspondingly, the terminal device receives RRC signaling (or MAC CE, or DCI) from the network device. The RRC signaling (or MAC CE, or DCI) includes a first parameter.

[0195] In mode 2, the first period at the terminal device level (or described as UE level) can be understood as the network device configuring the first period according to the terminal device granularity. In this way, for different terminal devices, the configuration of the first period can be the same or different, and this application does not limit this.

[0196] For the terminal device, after obtaining the first parameter, the terminal device executes S302:

[0197] S302. The terminal device uses a first transmission power to perform a first FDD uplink transmission.

[0198] The first transmit power is determined according to the first parameter.

[0199] Exemplarily, the terminal device determines a first power backoff amount based on a first parameter, determines a first transmit power based on the first power backoff amount, and then uses the first transmit power to perform a first FDD uplink transmission.

[0200] Optionally, under a discontinuous reception (DRX) mechanism, S302 may include:

[0201] During a first time period of a first cycle, the terminal device performs a first FDD uplink transmission using a first transmit power.

[0202] The first time period is an overlapping time period of the following two: a time period in the first cycle during which FDD uplink transmission is allowed, and a duration (OnDuration) of DRX.

[0203] Exemplarily, in the present application, the first cycle includes two types of time periods, such as a first type of time period and a second type of time period. In the first type of time period, the terminal device is allowed to perform FDD uplink transmission. For example, the first type of time period includes a time period when the SAR Mask state is on. In the second type of time period, the terminal device is not allowed to perform FDD uplink transmission. For example, the second type of time period includes a time period when the SAR Mask state is off.

[0204] In the first type of time period, if the current time point is within the duration of the DRX cycle, the terminal device follows the behavior of the duration in the DRX cycle. For example, the transmit power of the terminal device performing the first FDD uplink transmission is the first transmit power. The first transmit power is determined according to the first parameter, such as performing power fallback.

[0205] It is easy to understand that under the DRX mechanism, the following additional explanations are also made:

[0206] First, in the first type of time period, if the current time point is not within the duration of the DRX cycle, the terminal device follows the behavior of not within the duration of the DRX cycle. For example, the terminal device is in a sleep state and does not perform FDD uplink transmission.

[0207] Second, in the second type of time period, if the current time point is within the duration of the DRX cycle, the terminal device follows the Mask off behavior. It can be understood that if the current time point is within the second type of time period, even within the duration of the DRX cycle, the terminal device does not perform FDD uplink transmission. Optionally, the terminal device also does not perform physical downlink control channel (PDCCH) monitoring.

[0208] The PDCCH is used to transmit uplink scheduled DCI, or the PDCCH is used to transmit uplink scheduled DCI and downlink scheduled DCI.

[0209] In the case where PDCCH is used to transmit uplink scheduled DCI, it can be understood that the terminal device does not monitor the uplink scheduled DCI, but can monitor the downlink scheduled DCI so that the terminal device can perform downlink scheduling normally.

[0210] In the case where PDCCH is used to transmit uplink scheduled DCI and downlink scheduled DCI, it can be understood that the terminal device does not monitor the uplink scheduled DCI, but can also monitor the downlink scheduled DCI.

[0211] Third, during the second type of time period, if the current time point is not within the duration of the DRX cycle, the terminal device follows the behavior of not within the duration in the DRX cycle.

[0212] In some embodiments, Figure 4 As shown, after the terminal device executes S301 and before executing S302, it also executes S303 and S304:

[0213] S303. The terminal device determines a first power backoff amount according to the first parameter.

[0214] Exemplarily, the first power backoff amount is recorded as ΔP1.

[0215] Alternatively, as a first example, Figure 5 As shown, S303 includes S3031:

[0216] S3031. The terminal device determines a first power backoff amount based on the first parameter and the current power level.

[0217] Next, the process of determining the first power backoff amount is introduced in two ways (the following way 1 and way 2):

[0218] Method 1: The terminal device determines the first power backoff amount according to the first parameter, the second parameter, and the current power level, wherein the second parameter indicates the maximum transmit power of the terminal device, such as the maximum transmit power configured by the network device for the terminal device.

[0219] It is easy to understand that in the present application, the maximum transmit power indicated by the second parameter can be the maximum transmit power of TDD uplink transmission or the maximum transmit power of FDD uplink transmission, and the present application does not limit this. The maximum transmit power indicated by the second parameter can be recorded as P EMAX,c For details, please refer to the relevant introduction of the power backoff mechanism for TDD uplink transmission, which will not be repeated here.

[0220] In method 1, as the first possible implementation method:

[0221] If the proportion indicated by the first parameter is greater than the first proportion threshold, and the power indicated by the second parameter is less than or equal to the first power value, then:

[0222] If the current power level of the terminal device is the first level, the first power backoff amount is a first value.

[0223] If the current power level of the terminal device is the second level, the first power backoff amount is the second value.

[0224] Alternatively, the proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold; the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value, then:

[0225] If the current power level of the terminal device is the second level, the first power backoff amount is the third value.

[0226] For example, the first ratio threshold is 50%, and the second ratio threshold is 25%. The first power value is 23dBm, and the second power value is 26dBm. The first level is PC2, and the second level is PC1.5. The first value is 3dB, and the second and third values ​​are 6dB. In this case, it can be understood that:

[0227] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 23 dBm, and the maximum proportion of the duration of the FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is greater than 50%, then:

[0228] For a terminal device whose current power level is PC2, the first power backoff amount is 3dB.

[0229] For a terminal device whose current power level is PC1.5, the first power backoff amount is 6dB.

[0230] When the maximum transmit power of the terminal device is between 23dBm and 26dBm (i.e., the maximum transmit power of the terminal device is greater than 23dBm, and the maximum transmit power of the terminal device is less than or equal to 26dBm), and the maximum proportion of the duration of FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is between 25% and 50% (i.e., the maximum proportion of the duration of FDD uplink transmission in the first cycle is greater than 25%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle is less than or equal to 50%), then:

[0231] For a terminal device whose current power level is PC1.5, the first power backoff amount is 6dB.

[0232] That is to say, in the first possible implementation method of method one, the terminal device determines a first power backoff amount based on the first parameter, the second parameter and the current power level, and then determines a first transmit power of the first FDD uplink transmission based on the first power backoff amount, so that the transmit power of the FDD uplink transmission meets the SAR standard.

[0233] In method 1, as the second possible implementation method:

[0234] The power indicated by the second parameter is less than or equal to the first power value.

[0235] When the proportion indicated by the first parameter is greater than the first proportion threshold and less than the third proportion threshold, then:

[0236] If the current power level of the terminal device is the first level, the first power backoff amount is the ninth value.

[0237] If the current power level of the terminal device is the second level, the first power backoff amount is the tenth value.

[0238] When the proportion indicated by the first parameter is greater than or equal to the third proportion threshold and less than the fourth proportion threshold, then:

[0239] If the current power level of the terminal device is the first level, the first power backoff amount is the eleventh value.

[0240] If the current power level of the terminal device is the second level, the first power backoff amount is the twelfth value.

[0241] Alternatively, the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value:

[0242] When the proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the fifth proportion threshold, and the current power level of the terminal device is the second level, the first power backoff amount is the thirteenth value.

[0243] When the proportion indicated by the first parameter is greater than the fifth proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold, and the current power level of the terminal device is the second level, the first power backoff amount is the fourteenth value.

[0244] Exemplarily, the first ratio threshold is 50%, the second ratio threshold is 25%, the third ratio threshold is 75%, the fourth ratio threshold is 100%, and the fifth ratio threshold is 37.5%. The first power value is 23dBm, and the second power value is 26dBm. The first level is PC2, and the second level is PC1.5. The ninth value is 1.5dB, the tenth value, the eleventh value, and the thirteenth value are 3dB, and the twelfth value and the fourteenth value are 6dB. In this case, it can be understood that:

[0245] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 23dBm:

[0246] When the maximum proportion of the duration of FDD uplink transmission in the first period (i.e., the proportion indicated by the first parameter) is greater than 50% and less than 75%, then:

[0247] If the current power level of the terminal device is PC2, the first power backoff amount is 1.5dB.

[0248] If the current power level of the terminal device is PC1.5, the first power backoff amount is 3dB.

[0249] When the maximum proportion of the duration of FDD uplink transmission in the first period (ie, the proportion indicated by the first parameter) is greater than or equal to 75% and less than 100%, then:

[0250] If the current power level of the terminal device is PC2, the first power backoff amount is 3dB.

[0251] If the current power level of the terminal device is PC1.5, the first power backoff amount is 6dB.

[0252] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is greater than 23dBm, and the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 26dBm:

[0253] When the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than 25%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is less than or equal to 37.5%, then:

[0254] The current power level of the terminal device is PC1.5, and the first power backoff amount is 3dB.

[0255] When the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than 37.5%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is less than or equal to 50%, then:

[0256] The current power level of the terminal device is PC1.5, and the first power backoff amount is 6dB.

[0257] That is to say, in the second possible implementation of method 1, a more refined power backoff capability is provided. For example, in the relevant standards, the first power backoff amount is a multiple of 3, see the first possible implementation method for details. In the second possible implementation method, the first power backoff amount is a multiple of 1.5, so that the terminal device supports the power backoff capability with a granularity of 1.5dB, expands the power adjustment level that the terminal device may support, and improves the flexibility of power backoff.

[0258] In method 2, the terminal device determines the first power backoff amount according to the first parameter, the second parameter, the current power level, and the first capability. The second parameter indicates the maximum transmit power of the terminal device, which can be found in the introduction of method 1 and will not be described in detail.

[0259] Among them, the first capability indicates the maximum time proportion that the terminal device performs uplink transmission at a first power level in a first frequency band while meeting the SAR standard.

[0260] It should be noted that, in the present application, the uplink transmission involved in the first capability may include FDD uplink transmission or TDD uplink transmission, and the present application does not limit this.

[0261] Among them, the introduction of the first frequency band is as follows:

[0262] For example, the frequency of the first frequency band may be less than the first frequency threshold. For example, the first frequency threshold is 6000 MHz. The first frequency band may be a low-frequency FR1 band. Accordingly, the first capability may refer to maxUplinkDutyCycle-PC2-FR1 or maxUplinkDutyCycle-PC1dot5-MPE-FR1. For details, see the introduction of the TDD power fallback mechanism, which will not be repeated here.

[0263] For another example, the frequency of the first frequency band may be greater than the second frequency threshold. For example, the second frequency threshold is 24250 MHz. The first frequency band may be a high frequency FR2 band. Accordingly, the first capability may refer to maxUplinkDutyCycle-PC2-FR2. For details, see the introduction of the TDD power fallback mechanism, which will not be repeated here.

[0264] Among them, the first power level is introduced as follows:

[0265] For example, the first power level may be PC2. Accordingly, the first capability may refer to maxUplinkDutyCycle-PC2-FR1, or maxUplinkDutyCycle-PC2-FR2.

[0266] For another example, the first power level may be PC1.5. Correspondingly, the first capability may refer to maxUplinkDutyCycle-PC1dot5-MPE-FR1.

[0267] It is easy to understand that in this application, the capability parameters of the first capability are set when the terminal device leaves the factory to meet the SAR standard. In different regions, the SAR standards may be different. Accordingly, the capability parameters of the first capability are also different.

[0268] In the second method, as a first possible implementation method:

[0269] The frequency of the first frequency band is less than the first frequency threshold, and the first power level is the first level. The proportion indicated by the first parameter is greater than the proportion indicated by the first capability. The power indicated by the second parameter is less than or equal to the first power value, then:

[0270] If the current power level of the terminal device is the first level, the first power backoff amount is the fourth value.

[0271] If the current power level of the terminal device is the second level, the first power backoff amount is the fifth value.

[0272] or,

[0273] The frequency of the first frequency band is less than the first frequency threshold, and the first power level is the second level. The proportion indicated by the first parameter is greater than the first proportion threshold, and the proportion indicated by the first parameter is greater than the proportion indicated by the first capability. The power indicated by the second parameter is less than or equal to the first power value, then:

[0274] If the current power level of the terminal device is the first level, the first power backoff amount is the sixth value.

[0275] If the current power level of the terminal device is the second level, the first power backoff amount is the seventh value.

[0276] Exemplarily, the first frequency threshold is 6000MHz. This means that the first frequency band can be the low frequency FR1 band. The first power value is 23dBm. The first level is PC2, and the second level is PC1.5. The fourth and sixth values ​​are 3dB, and the fifth and seventh values ​​are 6dB. The first ratio threshold is 50%. In this case, it can be understood that:

[0277] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 23dBm:

[0278] When the first capability of the terminal device is maxUplinkDutyCycle-PC2-FR1, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than the proportion indicated by the first capability, then:

[0279] If the current power level of the terminal device is PC2, the first power backoff amount is 3dB.

[0280] If the current power level of the terminal device is PC1.5, the first power backoff amount is 6dB.

[0281] When the first capability of the terminal device is maxUplinkDutyCycle-PC1dot5-MPE-FR1, the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than 50%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than the proportion indicated by the first capability, then:

[0282] If the current power level of the terminal device is PC2, the first power backoff amount is 3dB.

[0283] If the current power level of the terminal device is PC1.5, the first power backoff amount is 6dB.

[0284] In method 2, as a second possible implementation method:

[0285] The first capability also indicates the maximum time proportion of the terminal device performing uplink transmission at the first power level in the second frequency band while meeting the SAR standard. The frequency of the second frequency band is greater than the second frequency threshold. The frequency of the first frequency band is less than the first frequency threshold, and the first power level is the first level. If the proportion indicated by the first parameter is greater than the time proportion of uplink transmission in the first frequency band indicated by the first capability, and the proportion indicated by the first parameter is less than the time proportion of uplink transmission in the second frequency band indicated by the first capability. The power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value, then:

[0286] The current power level of the terminal device is the second level, and the first power backoff amount is the fifteenth value.

[0287] Alternatively, the first capability indicates the maximum time proportion of the terminal device performing uplink transmission at the first power level in the first frequency band when the SAR standard is met. The frequency of the first frequency band is less than the first frequency threshold, and the first power level is the second level. If the proportion indicated by the first parameter is greater than the proportion of time for performing uplink transmission in the first frequency band indicated by the first capability, the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value, then:

[0288] The current power level of the terminal device is the second level, and the first power backoff amount is the eighth value.

[0289] Exemplarily, the first frequency threshold is 6000MHz. This means that the first frequency band can be the low frequency FR1 band. The second frequency threshold is 24250MHz. This means that the second frequency band can be the high frequency FR2 band. The first power value is 23dBm, and the second power value is 26dBm. The first level is PC2, and the second level is PC1.5. The eighth value and the fifteenth value are 3dB. In this case, it can be understood as:

[0290] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is greater than 23dBm, and the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 26dBm:

[0291] If the first capability of the terminal device includes maxUplinkDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC2-FR2, the maximum proportion of the duration of FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is greater than maxUplinkDutyCycle-PC2-FR1, and the maximum proportion of the duration of FDD uplink transmission in the first cycle is less than maxUplinkDutyCycle-PC2-FR2, then:

[0292] The current power level of the terminal device is PC1.5, and the first power backoff amount is 3dB.

[0293] If the first capability of the terminal device includes maxUplinkDutyCycle-PC1dot5-MPE-FR1, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is greater than maxUplinkDutyCycle-PC1dot5-MPE-FR1, then:

[0294] The current power level of the terminal device is PC1.5, and the first power backoff amount is 3dB.

[0295] That is to say, in method 2, the terminal device determines the first power backoff amount based on the first parameter, the second parameter and the current power level, and the first capability, and then determines the first transmit power of the first FDD uplink transmission based on the first power backoff amount, so that the transmit power of the FDD uplink transmission meets the SAR standard.

[0296] Optionally, in the second mode, the terminal device may further perform the following operations before performing S301:

[0297] The terminal device sends a capability parameter to the network device. Correspondingly, the network device receives the capability parameter from the terminal device. The capability parameter is used to indicate the first capability.

[0298] For example, the capability parameters include parameters of the following capabilities: maxUplinkDutyCycle-PC2-FR1, maxUplinkDutyCycle-PC2-FR2, or maxUplinkDutyCycle-PC1dot5-MPE-FR1, etc.

[0299] In this way, after receiving the capability parameter, the network device can determine the first parameter according to the capability parameter so that the first parameter matches the capability of the terminal device.

[0300] It is easy to understand that in S3031, the first power backoff amount is not zero, which means that the terminal device has performed power backoff when performing the first FDD uplink transmission.

[0301] The above describes the situation of executing power fallback in combination with S3031.

[0302] The following describes the case where power fallback is not performed in combination with case a and case b:

[0303] Case a: Under the first condition, the terminal device determines that the first power backoff amount is zero.

[0304] The first power backoff amount is zero, which can be understood as: no power backoff is performed.

[0305] The first condition includes the following two items:

[0306] Condition A1: the terminal device does not perform the first FDD uplink transmission within N1 sub-periods of N sub-periods.

[0307] Condition A2: the number of sub-cycles configured in the N sub-cycles for the first FDD uplink transmission does not exceed N2 sub-cycles.

[0308] In case a, the first cycle includes N sub-cycles, each of which allows the terminal device to perform FDD uplink transmission. N, N1 and N2 are positive integers, the sum of N1 and N2 is less than or equal to N, and each of the N1 sub-cycles is earlier than each of the N2 sub-cycles.

[0309] In the present application, each sub-period in the above N sub-periods may include one or more system frames, or may include X seconds, where X is a positive integer.

[0310] In the present application, the first condition includes two items, namely, condition A1 and condition A2. That is, only when condition A1 and condition A2 are satisfied (or established) at the same time can it be described as: under the first condition. In other words, only when condition A1 and condition A2 are satisfied (or established) at the same time can the first power backoff amount be zero.

[0311] In the present application, condition A1 and condition A2 are satisfied (or established) at the same time, which can be understood as: for the first cycle, during the time period in which the terminal device is allowed to perform FDD uplink transmission, the terminal device has not performed the first FDD uplink transmission in N1 sub-cycles, and once the terminal device is about to perform the first FDD uplink transmission, and the sub-cycle of the first FDD uplink transmission to be performed does not exceed N2 sub-cycles. In this case, when the terminal device actually performs the first FDD uplink transmission, power backoff is not performed, thereby increasing the possibility of success of the first FDD uplink transmission.

[0312] That is, compared with the first period, the granularity of the sub-period is smaller.

[0313] In this way, due to the introduction of the above sub-cycle, the terminal device can adjust the transmit power of the first FDD uplink transmission within a smaller granularity time range, thereby achieving a more refined transmit power adjustment range. In addition, in the first condition, the data scheduling situation is taken into account, which helps to improve the accuracy of the first power backoff amount, making the transmit power of the first FDD uplink transmission more accurate.

[0314] Furthermore, the first condition may also be combined with various implementations of S3031, specifically:

[0315] Combined with the first implementation method in method 1:

[0316] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 23dBm, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than 50%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is less than or equal to a certain threshold, such as 75%, then:

[0317] Under the first condition, if the terminal device has not been scheduled to perform the first FDD uplink transmission within N1 sub-periods during the time period in which the terminal device is allowed to perform FDD uplink transmission, once the terminal device is scheduled to perform the first FDD uplink transmission, and the sub-period of the first FDD uplink transmission to be performed does not exceed N2 sub-periods, then:

[0318] When the terminal device performs the first FDD uplink transmission, no power backoff is performed.

[0319] Otherwise, the terminal device performs backoff, that is, for a terminal device whose current power level is PC2, the first power backoff amount is 3dB, and for a terminal device whose current power level is PC1.5, the first power backoff amount is 6dB.

[0320] When the maximum transmit power of the terminal device is between 23dBm and 26dBm (i.e., the maximum transmit power of the terminal device is greater than 23dBm, and the maximum transmit power of the terminal device is less than or equal to 26dBm), and the maximum proportion of the duration of FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is between 25% and 50% (i.e., the maximum proportion of the duration of FDD uplink transmission in the first cycle is greater than 25%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle is less than or equal to 50%), then:

[0321] Under the first condition, if the terminal device has not been scheduled to perform the first FDD uplink transmission within N1 sub-periods during the time period in which the terminal device is allowed to perform FDD uplink transmission, once the terminal device is scheduled to perform the first FDD uplink transmission, and the sub-period of the first FDD uplink transmission to be performed does not exceed N2 sub-periods, then:

[0322] When the terminal device performs the first FDD uplink transmission, no power backoff is performed.

[0323] Otherwise, the terminal device performs backoff, that is, for a terminal device whose current power level is PC1.5, the first power backoff amount is 6dB.

[0324] Here, this application also provides a possible expansion method:

[0325] When the maximum transmit power of the terminal device is between 23dBm and 26dBm (i.e., the maximum transmit power of the terminal device is greater than 23dBm, and the maximum transmit power of the terminal device is less than or equal to 26dBm), and the maximum proportion of the duration of FDD uplink transmission in the first cycle (i.e., the proportion indicated by the first parameter) is between 25% and 50% (i.e., the maximum proportion of the duration of FDD uplink transmission in the first cycle is greater than 25%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle is less than or equal to 50%), then:

[0326] Under the second condition, if during the time period in which the terminal device is allowed to perform FDD uplink transmission, the terminal device has not been scheduled to perform the first FDD uplink transmission for N3 sub-cycles, once the terminal device is scheduled to perform the first FDD uplink transmission, and the sub-cycle of the first FDD uplink transmission to be performed does not exceed N4 sub-cycles, then: the first power backoff amount is 3dB, so that the first power backoff amount is between 0dB and 6dB, so as to make the first FDD uplink transmission a compromise between the transmission success rate and the electromagnetic wave radiation energy.

[0327] In the second condition, the first cycle includes N sub-cycles, and each sub-cycle of the N sub-cycles allows the terminal device to perform FDD uplink transmission. N, N3 and N4 are positive integers, the sum of N3 and N4 is less than or equal to N, and each sub-cycle in the N3 sub-cycles is earlier than each sub-cycle in the N4 sub-cycles. For example, when the values ​​of N3 and N1 are the same, the values ​​of N4 and N2 are different. For example, when the values ​​of N3 and N1 are different, the values ​​of N4 and N2 can be the same or different.

[0328] Combined with the first implementation method in method 2:

[0329] When the maximum transmit power of the terminal device (such as the maximum transmit power configured by the network device for the terminal device) is less than or equal to 23dBm:

[0330] When the first capability of the terminal device is maxUplinkDutyCycle-PC2-FR1, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than the proportion indicated by the first capability, then:

[0331] Under the first condition, if the terminal device has not been scheduled to perform the first FDD uplink transmission for N1 sub-periods during the time period in which the terminal device is allowed to perform FDD uplink transmission, once the terminal device is scheduled to perform the first FDD uplink transmission, and the sub-period for performing the first FDD uplink transmission does not exceed N2 sub-periods, then:

[0332] When the terminal device performs the first FDD uplink transmission, no power backoff is performed.

[0333] Otherwise, the terminal device performs backoff, that is, if the current power level of the terminal device is PC2, the first power backoff amount is 3dB. If the current power level of the terminal device is PC1.5, the first power backoff amount is 6dB.

[0334] When the first capability of the terminal device is maxUplinkDutyCycle-PC1dot5-MPE-FR1, the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than 50%, and the maximum proportion of the duration of FDD uplink transmission in the first cycle (that is, the proportion indicated by the first parameter) is greater than the proportion indicated by the first capability, then:

[0335] Under the first condition, if the terminal device has not been scheduled to perform the first FDD uplink transmission for N1 sub-periods during the time period in which the terminal device is allowed to perform FDD uplink transmission, once the terminal device is scheduled to perform the first FDD uplink transmission, and the sub-period for performing the first FDD uplink transmission does not exceed N2 sub-periods, then:

[0336] When the terminal device performs the first FDD uplink transmission, no power backoff is performed.

[0337] Otherwise, the terminal device performs backoff, that is, if the current power level of the terminal device is PC2, the first power backoff amount is 3dB. If the current power level of the terminal device is PC1.5, the first power backoff amount is 6dB.

[0338] It is easy to understand that when either condition A1 or condition A2 is not met, the first condition is not met, and the terminal device can determine the first power backoff amount according to the introduction of S3031, which will not be repeated.

[0339] Case b: The terminal device determines the first power backoff amount based on the first parameter and the signal type of the uplink signal.

[0340] The first power backoff amount is used to determine the first transmit power, and the uplink signal is sent through the first FDD uplink transmission.

[0341] Exemplarily, the signal type of the uplink signal is a special signal, for example, a signal carrying a random access request in a physical random access channel (PRACH) process.

[0342] For example, the PRACH process executed by the terminal device triggered by the network device can be recorded as a PDCCH ordered PRACH process. In this process, when the terminal device sends a random access request through the first FDD uplink transmission, power backoff is not performed, that is, the first power backoff amount is zero, so as to increase the possibility of successful uplink signal transmission, which helps to ensure the performance of some types of uplink signals.

[0343] It is easy to understand that, on the contrary, if the signal type of the uplink signal is a common signal, such as a data signal, the first power backoff amount can refer to the introduction of S3031 and / or situation a, and will not be repeated here.

[0344] For the terminal device, after determining the first power backoff amount, the terminal device executes S304:

[0345] S304. The terminal device determines a first transmit power according to the first power backoff amount.

[0346] Exemplarily, the terminal device determines the transmit power of the first FDD uplink transmission according to the first power backoff amount and formula (1), which will not be described in detail.

[0347] That is to say, the terminal device determines a first power backoff amount according to the acquired first parameter, and then determines a first transmit power according to the first power backoff amount, thereby achieving power backoff for FDD uplink transmission.

[0348] It should be added that the first parameter can be updated dynamically.

[0349] For example, when the first parameter is transmitted via RRC signaling (see the introduction of S301 for details), the first parameter can be updated by RRC reconfiguration, thereby realizing flexible configuration of the parameter. Alternatively, when the first parameter is transmitted via a broadcast message (see the introduction of S301 for details), the first parameter can be updated via a broadcast message, thereby realizing flexible configuration of the parameter.

[0350] For another example, when the first parameter is transmitted through RRC signaling (see the introduction of S301 for details), before the terminal device obtains the first parameter through RRC signaling, the following operations may also be performed:

[0351] The terminal device determines a second power backoff amount based on the third parameter.

[0352] Among them, the third parameter is introduced as follows:

[0353] As a possibility, the third parameter is a preset parameter. For example, the third parameter is a fixed value preset by the communication system. It can be understood that before the terminal device obtains the first parameter through RRC signaling, determining the second power fallback amount according to the preset parameter helps to improve the transmission power of the FDD uplink transmission.

[0354] As another possibility, the third parameter is a parameter indicated by the second broadcast message. It can be understood that before the terminal device obtains the first parameter through RRC signaling, the second power fallback amount is determined according to the parameter indicated by the second broadcast message, so as to meet the configuration requirements of the network side for the FDD uplink transmission power. Among them, the network device can determine the third parameter according to the current network side form, such as the orbital height or elevation angle of the network device in the satellite communication scenario.

[0355] The second power backoff amount is described as follows:

[0356] The second power backoff amount is used to determine the transmit power of the second FDD uplink transmission. The second FDD uplink transmission is earlier than the first FDD uplink transmission.

[0357] For another example, when the first parameter is transmitted via RRC signaling (see the introduction of S301 for details), before the terminal device obtains the first parameter via RRC signaling, the terminal device determines that the transmit power of the second FDD uplink transmission is a fixed value, such as 23dBm, to meet the SAR standard.

[0358] It should be added that, when the first parameter is not updated, the first period is implemented in a periodic manner, which helps to save signaling overhead. The first period is implemented in a periodic manner, which can be understood as: when the terminal device performs FDD uplink transmission in different periods, the first parameter is used to determine the power backoff amount.

[0359] For example, taking the case where the length of the first cycle is equal to the observation cycle of the SAR as an example: in the observation cycle 1 of the SAR, the terminal device needs to perform FDD uplink transmission. In this case, the power backoff amount for the FDD uplink transmission in the observation cycle 1 of the SAR is determined based on the first parameter. In the observation cycle 2 of the SAR, the terminal device needs to perform FDD uplink transmission. In this case, the power backoff amount for the FDD uplink transmission in the observation cycle 2 of the SAR is also determined based on the first parameter.

[0360] It is understandable that in the above embodiments, the methods and / or steps implemented by the terminal device may also be implemented by components (such as processors, chips, chip systems, circuits, logic modules, or software) that can be used in the terminal device. The chip system may be composed of chips, or the chip system may include chips and other discrete devices.

[0361] It is understandable that, in order to realize the above functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware 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.

[0362] The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0363] Optional, Figure 6 The structure diagram of a communication device 600 is shown. The communication device 600 includes a processing module 601 and a transceiver module 602 .

[0364] For example, the communication device 600 can be used to implement the functions of the above-mentioned terminal device.

[0365] In some embodiments, the communication device 600 may further include a storage module ( Figure 6 ), for storing program instructions and data.

[0366] In some embodiments, the transceiver module 602, which may also be referred to as a transceiver unit, is used to implement the sending and / or receiving functions. The transceiver module 602 may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.

[0367] In some embodiments, the transceiver module 602 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the terminal device in the above-mentioned method embodiment, and / or used to support other processes of the technology described in this document; the processing module 601 may be used to execute the processing steps (such as determination, etc.) performed by the terminal device in the above-mentioned method embodiment, and / or used to support other processes of the technology described in this document.

[0368] Exemplarily, when the communication device 600 is used to implement the functions of the above terminal device:

[0369] The processing module 601 is used to obtain a first parameter. The first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, and the length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard.

[0370] The transceiver module 602 is configured to perform a first FDD uplink transmission using a first transmit power. The first transmit power is determined by the processing module 601 according to the first parameter.

[0371] In one possible design, the processing module 601 is further configured to determine a power backoff amount based on the first parameter. The power backoff amount is used to determine the first transmit power.

[0372] In one possible design, the processing module 601 is used to determine the power backoff amount based on the first parameter, including: determining the power backoff amount based on the first parameter and the current power level of the terminal device.

[0373] In one possible design, the processing module 601 is used to determine the power backoff amount according to the first parameter and the current power level of the terminal device, including: determining the power backoff amount according to the first parameter and the second parameter, and the current power level of the terminal device. Wherein, the second parameter indicates the maximum transmit power of the terminal device.

[0374] In one possible design, the processing module 601 is used to determine the power backoff amount based on the first parameter and the second parameter, and the current power level of the terminal device, including: determining the power backoff amount based on the first parameter, the second parameter and the current power level of the terminal device, and the first capability.

[0375] Among them, the first capability indicates the maximum time proportion of the terminal device performing uplink transmission at a first power level in a first frequency band while meeting the SAR standard.

[0376] In one possible design, the transceiver module 602 is also used to send capability parameters, where the capability parameters are used to indicate the first capability.

[0377] In one possible design, the transceiver module 602 is used to perform a first FDD uplink transmission using a first transmission power, including: performing a first FDD uplink transmission using a first transmission power within a first time period of the first cycle, wherein the first time period is an overlapping time period of the following two: a time period in the first cycle during which the FDD uplink transmission is allowed to be performed, and a duration of DRX.

[0378] In one possible design, the first cycle includes N sub-cycles, and each of the N sub-cycles allows the terminal device to perform the FDD uplink transmission.

[0379] The processing module 601 is used to determine the power backoff amount according to the first parameter, including: under a first condition, determining that the power backoff amount is zero.

[0380] The first condition includes: the terminal device does not perform the first FDD uplink transmission within N1 sub-periods of the N sub-periods, and the sub-periods configured for the first FDD uplink transmission in the N sub-periods do not exceed N2 sub-periods. N, N1 and N2 are positive integers, the sum of N1 and N2 is less than or equal to N, and each sub-period in the N1 sub-periods is earlier than each sub-period in the N2 sub-periods.

[0381] In one possible design, the processing module 601 is used to determine the power backoff amount according to the first parameter, including: determining the power backoff amount according to the first parameter and a signal type of an uplink signal. The uplink signal is sent via the first FDD uplink transmission.

[0382] Exemplarily, when the communication device 600 is used to implement the functions of the above network device:

[0383] The processing module 601 is used to determine a first parameter. The first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, and the length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard.

[0384] The transceiver module 602 is used to send the first parameter.

[0385] In one possible design, the processing module 601 is configured to determine the first parameter, including: receiving a capability parameter through the transceiver module 602. The capability parameter is used to indicate a first capability, and the first capability indicates a maximum time proportion of uplink transmission at a first power level in a first frequency band performed by a terminal device when the SAR standard is met. The first parameter is determined according to the capability parameter.

[0386] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

[0387] In the present application, the communication device 600 may be presented in the form of dividing various functional modules in an integrated manner. The "module" here may refer to a specific application-specific integrated circuit (ASIC), a circuit, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.

[0388] In some embodiments, when Figure 6 When the communication device 600 is a chip or a chip system, the function / implementation process of the transceiver module 602 can be implemented through the input and output interface (or communication interface) of the chip or the chip system, and the function / implementation process of the processing module 601 can be implemented through the processor (or processing circuit) of the chip or the chip system.

[0389] Since the communication device 600 provided in this embodiment can execute the above method, the technical effects that can be obtained can refer to the above method embodiments and will not be repeated here.

[0390] As a possible product form, the terminal device described in the embodiment of the present application can also be implemented using the following: one or more field programmable gate arrays (FPGA), programmable logic devices (PLD), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits that can perform the various functions described throughout the present application.

[0391] As another possible product form, the terminal device described in the embodiment of the present application can be implemented by a general bus architecture. Figure 7 , Figure 77 is a schematic diagram of the structure of a communication device 700 provided in an embodiment of the present application, and the communication device 700 includes a processor 701 and a transceiver 702. The communication device 700 may be a terminal device, or a chip or chip system therein. Figure 7 Only the main components of the communication device 700 are shown. In addition to the processor 701 and the transceiver 702, the communication device may further include a memory 703 and an input and output device (not shown in the figure).

[0392] Optionally, the processor 701 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program. The memory 703 is mainly used to store the software program and data. The transceiver 702 may include a radio frequency circuit and an antenna. The radio frequency circuit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. The input and output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.

[0393] Optionally, the processor 701, the transceiver 702, and the memory 703 may be connected via a communication bus.

[0394] When the communication device is turned on, the processor 701 can read the software program in the memory 703, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 701 performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 701. The processor 701 converts the baseband signal into data and processes the data.

[0395] In another implementation, the RF circuit and antenna may be arranged independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be arranged remotely from the communication device.

[0396] In some embodiments, in terms of hardware implementation, those skilled in the art may imagine that the communication device 600 may be implemented as Figure 7 The form of the communication device 700 is shown.

[0397] As an example, Figure 6 The function / implementation process of the processing module 601 in Figure 7 The processor 701 in the communication device 700 shown calls the computer execution instructions stored in the memory 703 to implement. Figure 6 The function / implementation process of the transceiver module 602 can be Figure 7 The transceiver 702 in the communication device 700 is shown to be implemented.

[0398] As another possible product form, the terminal device in this application can adopt Figure 8 The structure shown, or including Figure 8 Parts shown. Figure 8 A schematic diagram of the composition of a communication device 800 provided in the present application, wherein the communication device 800 may be a terminal device or a module or chip or system on chip in the terminal device.

[0399] like Figure 8 As shown, the communication device 800 includes at least one processor 801 and at least one communication interface ( Figure 8 The communication device 800 is merely exemplary and is described by taking a communication interface 804 and a processor 801 as an example. Optionally, the communication device 800 may further include a communication bus 802 and a memory 803.

[0400] The processor 801 may be a general-purpose central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 801 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0401] The communication bus 802 is used to connect different components in the communication device 800 so that the different components can communicate. The communication bus 802 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0402] The communication interface 804 is used to communicate with other devices or communication networks. Exemplarily, the communication interface 804 can be a module, a circuit, a transceiver, or any device capable of implementing communication. Optionally, the communication interface 804 can also be an input / output interface located in the processor 801 to implement signal input and signal output of the processor.

[0403] The memory 803 may be a device with a storage function, used to store instructions and / or data, wherein the instructions may be computer programs.

[0404] Exemplarily, the memory 803 may be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0405] It should be noted that the memory 803 may exist independently of the processor 801 or may be integrated with the processor 801. The memory 803 may be located in the communication device 800 or outside the communication device 800, without limitation. The processor 801 may be used to execute instructions stored in the memory 803 to implement the method provided in the following embodiments of the present application.

[0406] As an optional implementation, the communication device 800 may further include an output device 805 and an input device 806. The output device 805 communicates with the processor 801 and may display information in a variety of ways. For example, the output device 805 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. The input device 806 communicates with the processor 801 and may receive user input in a variety of ways. For example, the input device 806 may be a mouse, a keyboard, a touch screen device, or a sensor device.

[0407] In some embodiments, in terms of hardware implementation, those skilled in the art may think of the above Figure 6 The communication device 600 shown may be used Figure 8 The form of the communication device 800 is shown.

[0408] As an example, Figure 6 The function / implementation process of the processing module 601 in Figure 8 The processor 801 in the communication device 800 shown calls the computer execution instructions stored in the memory 803 to implement. Figure 6 The function / implementation process of the transceiver module 602 can be Figure 8 The communication interface 804 in the communication device 800 is shown to be implemented.

[0409] It should be pointed out that Figure 8 The structure shown does not constitute a specific limitation on the terminal device. For example, in other embodiments of the present application, the terminal device may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0410] In some embodiments, an embodiment of the present application further provides a communication device, which includes a processor for implementing a method in any of the above method embodiments.

[0411] As a possible implementation, the communication device further includes a memory. The memory is used to store necessary computer programs and data. The computer program may include instructions, and the processor may call the instructions in the computer program stored in the memory to instruct the communication device to execute the method in any of the above method embodiments. Of course, the memory may not be in the communication device.

[0412] As another possible implementation, the communication device also includes an interface circuit, which is a code / data read / write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.

[0413] As another possible implementation manner, the communication device further includes a communication interface, and the communication interface is used to communicate with a module outside the communication device.

[0414] It can be understood that the communication device can be a chip or a chip system. When the communication device is a chip system, it can be composed of chips, or it can include chips and other discrete devices. The embodiments of the present application do not specifically limit this.

[0415] The present application also provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a computer, the functions of any of the above method embodiments are implemented.

[0416] The present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0417] Those skilled in the art will appreciate that, for the sake of convenience and brevity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0418] It is understood that the systems, devices and methods described in the present application can also be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the 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. Another point is that 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.

[0419] The units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed over multiple network units. The components shown as units may or may not be physical units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0420] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0421] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with the medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state drive (SSD)), etc. In the embodiment of the present application, the computer may include the aforementioned device.

[0422] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in a claim. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0423] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A communication method, characterized in that: include: Obtaining a first parameter; the first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, and the cycle length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard; A first frequency division duplex (FDD) uplink transmission is performed using a first transmit power; the first transmit power is determined according to the first parameter.

2. The method according to claim 1, characterized in that The method further comprises: A power backoff amount is determined according to the first parameter; the power backoff amount is used to determine the first transmit power.

3. The method according to claim 2, characterized in that Determining a power backoff amount according to the first parameter includes: The power backoff amount is determined according to the first parameter and the current power level of the terminal device.

4. The method according to claim 3, characterized in that Determining the power backoff amount according to the first parameter and the current power level of the terminal device includes: Determining the power backoff amount according to the first parameter and the second parameter, and the current power level of the terminal device; The second parameter indicates the maximum transmission power of the terminal device.

5. The method according to claim 4, characterized in that The proportion indicated by the first parameter is greater than a first proportion threshold, and the power indicated by the second parameter is less than or equal to a first power value; If the current power level of the terminal device is the first level, the power backoff amount is the first value; or, If the current power level of the terminal device is the second level, the power backoff amount is a second value.

6. The method according to claim 4, characterized in that The proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold; the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value; The current power level of the terminal device is the second level, and the power backoff amount is the third value.

7. The method according to claim 4, characterized in that Determining the power backoff amount according to the first parameter and the second parameter, and the current power level of the terminal device, includes: Determine the power backoff amount according to the first parameter, the second parameter, the current power level of the terminal device, and the first capability; Among them, the first capability indicates the maximum time proportion of the terminal device performing uplink transmission at a first power level in a first frequency band while meeting the SAR standard.

8. The method according to claim 7, characterized in that The frequency of the first frequency band is less than a first frequency threshold, and the first power level is a first level; the proportion indicated by the first parameter is greater than the proportion indicated by the first capability; and the power indicated by the second parameter is less than or equal to a first power value; If the current power level of the terminal device is the first level, the power backoff amount is a fourth value; or, If the current power level of the terminal device is the second level, the power backoff amount is the fifth value.

9. The method according to claim 7, characterized in that: The frequency of the first frequency band is less than a first frequency threshold, and the first power level is a second level; the proportion indicated by the first parameter is greater than a first proportion threshold, and the proportion indicated by the first parameter is greater than the proportion indicated by the first capability; the power indicated by the second parameter is less than or equal to the first power value; If the current power level of the terminal device is the first level, the power backoff amount is the sixth value; or, If the current power level of the terminal device is the second level, the power backoff amount is the seventh value.

10. The method according to claim 7, characterized in that The frequency of the first frequency band is less than a first frequency threshold, and the first power level is a second level; The proportion indicated by the first parameter is greater than the proportion indicated by the first capability; the power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value; The current power level of the terminal device is the second level, and the power backoff amount is the eighth value.

11. The method according to any one of claims 7 to 10, characterized in that: The method further comprises: A capability parameter is sent, where the capability parameter is used to indicate the first capability.

12. The method according to any one of claims 2 to 4 and 7, characterized in that: The first cycle includes N sub-cycles, and each sub-cycle of the N sub-cycles allows the terminal device to perform FDD uplink transmission; Determining a power backoff amount according to the first parameter includes: Under a first condition, determining that the power backoff amount is zero; The first condition includes: The terminal device does not perform the first FDD uplink transmission within N1 sub-periods of the N sub-periods; and, The sub-period configured in the N sub-periods for the first FDD uplink transmission does not exceed N2 sub-periods; N, N1 and N2 are positive integers, the sum of N1 and N2 is less than or equal to N, and each sub-period in the N1 sub-periods is earlier than each sub-period in the N2 sub-periods.

13. The method according to claim 4, characterized in that The power indicated by the second parameter is less than or equal to the first power value; When the proportion indicated by the first parameter is greater than the first proportion threshold and less than the third proportion threshold, If the current power level of the terminal device is the first level, the power backoff amount is a ninth value; or, If the current power level of the terminal device is the second level, the power backoff amount is the tenth value; When the proportion indicated by the first parameter is greater than or equal to the third proportion threshold and less than the fourth proportion threshold, If the current power level of the terminal device is the first level, the power backoff amount is the eleventh value; or, If the current power level of the terminal device is the second level, the power backoff amount is the twelfth value.

14. The method according to claim 4, characterized in that The power indicated by the second parameter is greater than the first power value, and the power indicated by the second parameter is less than or equal to the second power value; When the proportion indicated by the first parameter is greater than the second proportion threshold, and the proportion indicated by the first parameter is less than or equal to the fifth proportion threshold, the current power level of the terminal device is the second level, and the power backoff amount is the thirteenth value; When the proportion indicated by the first parameter is greater than the fifth proportion threshold, and the proportion indicated by the first parameter is less than or equal to the first proportion threshold, and the current power level of the terminal device is the second level, the power backoff amount is the fourteenth value.

15. The method according to any one of claims 2 to 14, characterized in that: Determining a power backoff amount according to the first parameter includes: Determining a power backoff amount according to the first parameter and a signal type of the uplink signal; The uplink signal is sent via the first FDD uplink transmission.

16. The method according to claim 15, characterized in that The signal type of the uplink signal is a random access request, and the power backoff amount is zero.

17. The method according to any one of claims 1 to 16, characterized in that: The method is applied to a terminal device; The starting position of the first cycle is the starting position of a random access channel opportunity RO; or, there is a first offset between the starting position of the first cycle and the starting position of the RO; The RO is the timing at which the terminal device initiates a random access request.

18. The method according to any one of claims 1 to 17, characterized in that: The first parameter is carried in at least one of the following: radio resource control RRC signaling, access media control element MAC CE, downlink control information DCI or broadcast message.

19. The method according to any one of claims 1 to 18, characterized in that: Performing a first FDD uplink transmission using a first transmit power includes: In a first time period of the first cycle, a first FDD uplink transmission is performed using a first transmit power, The first time period is an overlapping time period of the following two: a time period in the first cycle during which FDD uplink transmission is allowed, and a duration of discontinuous reception DRX.

20. The method according to any one of claims 1 to 19, characterized in that: The method is applied to a terminal device; The cycle length and starting position of the first cycle are configured by the network device for the terminal device; or, The cycle length and starting position of the first cycle are predefined.

21. A communication method, characterized in that: include: Determine a first parameter; the first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, and the cycle length of the first cycle is determined according to the electromagnetic energy absorption ratio SAR standard; The first parameter is sent.

22. The method according to claim 21, characterized in that Determine the first parameter, including: Receiving capability parameter; the capability parameter is used to indicate a first capability, the first capability indicating the maximum time proportion of uplink transmission performed by the terminal device at a first power level in a first frequency band when the SAR standard is met; The first parameter is determined according to the capability parameter.

23. The method according to claim 21 or 22, characterized in that The first parameter is carried in at least one of the following: radio resource control RRC signaling, access media control element MAC CE, downlink control information DCI or broadcast message.

24. The method according to any one of claims 1 to 23, characterized in that The first parameter is used to indicate the maximum proportion of the duration of uplink transmission in the first cycle, including: the first parameter is used to indicate the maximum proportion of the duration of FDD uplink transmission in the first cycle.

25. A communication device, characterized in that: The communication device comprises a processor; the processor is used to run a computer program or instruction so that the communication device executes the method according to any one of claims 1-20 and 24, or so that the communication device executes the method according to any one of claims 21-24.

26. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions or programs, and when the computer instructions or programs are executed on a computer, the method according to any one of claims 1 to 20 and 24 is executed, or the method according to any one of claims 21 to 24 is executed.

27. A computer program product, characterized in that The computer program product includes computer instructions; when part or all of the computer instructions are run on a computer, the method according to any one of claims 1 to 20 and 24 is executed, or the method according to any one of claims 21 to 24 is executed.

28. A chip, characterized in that: include: a memory for storing computer program instructions; A processor, configured to execute the computer program instructions so that a communication device including the chip performs the method according to any one of claims 1-20 and 24, or a communication device including the chip performs the method according to any one of claims 21-24.

29. A communication system, characterized in that: include: A terminal device and a network device, wherein the terminal device is used to execute the method according to any one of claims 1-20 and 24, and the network device is used to execute the method according to any one of claims 21-24.

Images