Communication method and apparatus

Abstract

Disclosed are a communication method and apparatus, which relate to the technical field of communications. In the method, a terminal is configured with a first maximum transmit power and a second maximum transmit power. The second maximum transmit power is greater than the first maximum transmit power. The method comprises: a terminal determining a first power headroom on the basis of a first maximum transmit power, and sending the first power headroom, thereby enabling the terminal to perform uplink transmission at a lower transmit power, so as to reduce the average transmit power of the terminal, such that the terminal complies with electromagnetic radiation regulations; and then, the terminal receiving first indication information, determining, upon receiving the first indication information, a second power headroom on the basis of the second maximum transmit power, and sending the second power headroom, thereby enabling the terminal to perform uplink transmission at a higher transmit power, so as to achieve better uplink coverage performance.

Description

A communication method and apparatus

[0001] This application claims priority to Chinese patent application filed on December 5, 2024, with application number 202411788375.9 and entitled "A Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0003] In communication systems, the transmit power of terminals must comply with electromagnetic radiation regulations. These regulations limit the transmit power of terminals, impacting uplink coverage performance and range, resulting in a poor user experience. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a communication method and apparatus that can improve uplink coverage performance and range. To achieve the above objective, this application adopts the following technical solution:

[0005] Firstly, a communication method is provided. This method can be executed by a terminal, by a component within the terminal (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the terminal's functions. The following description uses the terminal as the executing entity. The method includes:

[0006] A first power margin is determined based on a first maximum transmit power, and the first power margin is transmitted. A first indication information is received. Upon receiving the first indication information, a second power margin is determined based on a second maximum transmit power, where the second maximum transmit power is greater than the first maximum transmit power. The second power margin is transmitted.

[0007] Specifically, determining the first power margin based on the first maximum transmission power and transmitting the first power margin can be understood as the terminal being in a first working mode.

[0008] Specifically, determining the second power margin based on the second maximum transmit power and transmitting the second power margin can be understood as the terminal being in a second working mode.

[0009] In other words, the terminal can switch between different operating modes. For example, upon receiving the first indication information, it can switch from the first operating mode to the second operating mode. Because the terminal can transmit uplink at a higher transmit power in the second operating mode, it can achieve better uplink coverage performance. Furthermore, even if the transmit power of the terminal in the second operating mode may exceed the specific absorptivity (SAR) power limit, since the terminal spends very little time in the second operating mode and most of its time in the first operating mode, and the transmit power in the first operating mode is usually less than or far less than the SAR power limit, the average transmit power of the terminal within a SAR cycle is low, still meeting SAR regulations and temperature safety regulations.

[0010] In one possible design, after sending the second power margin, the method further includes: receiving second indication information, and, upon receiving the second indication information, determining a third power margin based on the first maximum transmit power, and sending the third power margin.

[0011] In other words, the terminal can switch based on the signaling of the network device, such as the second indication information, so as to facilitate the network device to control the terminal.

[0012] In one possible design, after transmitting the second power margin, the method further includes: determining a third power margin based on the first maximum transmit power, provided that the runtime of the first timer reaches a first duration, wherein the start time of the first timer is the reception time of the first indication information; and transmitting the third power margin.

[0013] In other words, the terminal switches according to the runtime of the first timer.

[0014] In one possible design, after sending the second power margin, the method further includes: sending a third indication message, and under the condition of sending the third indication message, determining a third power margin based on the first maximum transmit power, and sending the third power margin.

[0015] In other words, the sending of the third instruction information triggers the terminal to switch from the second working mode to the first working mode.

[0016] In one possible design, the third indication information instructs the terminal to determine the second power margin based on the second maximum transmit power. Alternatively, the third indication information can be understood as instructing the terminal to stop determining the second power margin based on the second maximum transmit power.

[0017] Alternatively, the third indication information instructs the terminal to determine the third power margin based on the first maximum transmit power. This can also be understood as the third indication information instructing the terminal to begin determining the third power margin based on the first maximum transmit power.

[0018] In other words, the terminal also reports its current working mode through the third indication information.

[0019] In one possible design, after sending the third power margin, the method further includes: sending a fourth indication information, and under the condition of sending the fourth indication information, determining a fourth power margin based on the second maximum transmit power, and sending the fourth power margin.

[0020] In other words, the transmission of the fourth instruction information triggers the terminal to switch from the first working mode to the second working mode.

[0021] In one possible design, the fourth indication information instructs the terminal to determine the third power margin based on the first maximum transmit power. Alternatively, the fourth indication information can be understood as instructing the terminal to stop determining the third power margin based on the first maximum transmit power.

[0022] Alternatively, the fourth indication information instructs the terminal to determine the fourth power margin based on the second maximum transmit power. This can also be understood as the fourth indication information instructing the terminal to begin determining the fourth power margin based on the second maximum transmit power.

[0023] In other words, the terminal also reports its current working mode through the fourth instruction information.

[0024] Secondly, a communication method is provided. This method can be executed by a network device, by a component within the network device (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the functions of the network device. The following description uses the network device as the executing entity. The method includes:

[0025] The terminal receives a first power margin, which is determined based on a first maximum transmit power. It then sends a first indication message instructing the terminal to determine a second power margin based on a second maximum transmit power, where the second maximum transmit power is greater than the first maximum transmit power. Finally, the terminal receives the second power margin.

[0026] In one possible design, after receiving the second power margin, the method further includes: sending second indication information, the second indication information instructing the terminal to determine a third power margin based on the first maximum transmit power; and receiving the third power margin.

[0027] In one possible design, after receiving the second power margin, the method further includes: receiving third indication information, the third indication information instructing the terminal to determine a third power margin based on the first maximum transmit power. The third power margin is then received.

[0028] In one possible design, after receiving the third power margin, the method further includes: receiving fourth indication information, the fourth indication information instructing the terminal to determine a fourth power margin based on the second maximum transmit power. The fourth power margin is then received.

[0029] The technical effects of any design method in the second aspect can be seen in the technical effects of any design method in the first aspect, and will not be repeated here.

[0030] Thirdly, a communication method is provided. This method can be executed by a terminal, by a component within the terminal (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the terminal's functions. The following description uses the terminal as the executing entity. The method includes:

[0031] Based on the energy margin, the first maximum transmit power, and the second maximum transmit power, a third maximum transmit power is determined. The energy margin indicates the energy margin for the first time period, and the second maximum transmit power is greater than the first maximum transmit power. Based on the third maximum transmit power, a fifth power margin is determined. The third maximum transmit power and the fifth power margin are then transmitted.

[0032] In other words, the terminal autonomously determines the third maximum transmit power for uplink transmission, such as determining the third maximum transmit power based on the energy margin, the first maximum transmit power, and the second maximum transmit power, and then determining the fifth power margin based on the third maximum transmit power, so that the network device indicates the transmit power to the terminal based on the fifth power margin and the third maximum transmit power.

[0033] Since the second maximum transmit power is greater than the first maximum transmit power, the terminal may perform uplink transmission at a higher transmit power. For example, when the terminal has a large energy margin in the first time period, the third maximum transmit power determined based on the energy margin, the first maximum transmit power, and the second maximum transmit power may be greater than the first maximum transmit power, thus enabling the terminal to perform uplink transmission at a higher transmit power and achieving better uplink coverage performance.

[0034] Conversely, when the terminal has a small energy margin during the first time period, the third maximum transmission power determined based on the energy margin, the first maximum transmission power, and the second maximum transmission power may be less than or equal to the first maximum transmission power, thereby enabling the terminal to perform uplink transmission at a lower transmission power, thus meeting SAR regulations and temperature safety regulations.

[0035] In one possible design, determining the third maximum transmission power based on the energy margin, the first maximum transmission power, and the second maximum transmission power includes: selecting a maximum transmission power from the first maximum transmission power and the second maximum transmission power according to the terminal's operating state, and determining the third maximum transmission power based on the energy margin and the selected maximum transmission power.

[0036] In other words, when determining the third maximum transmission power, the operating state of the terminal is also taken into account so that the third maximum transmission power can be adapted to different operating states of the terminal.

[0037] For example, when the temperature or power consumption of the terminal is high, the third maximum transmit power may be less than or equal to the first maximum transmit power, so that the terminal can perform uplink transmission with a lower transmit power, thereby meeting SAR regulations and temperature safety regulations.

[0038] For example, when the temperature or power consumption of the terminal is low, the third maximum transmit power may be equal to the second maximum transmit power, so that the terminal can transmit uplink at a higher transmit power, thereby achieving better uplink coverage performance.

[0039] In one possible design, the third maximum transmit power satisfies:

[0040] Wherein, min() represents the smaller value operator, EHR indicates the energy margin, select() represents the selection operator, and Pcmax represents the first maximum transmit power. This indicates the second maximum transmit power.

[0041] In one possible design, the method further includes: transmitting the second maximum transmit power to report the capabilities of the terminal.

[0042] In one possible design, the energy margin satisfies: T·SAR-∑ T P(i)

[0043] Where T represents the duration of the first time period, SAR represents the power limit of the specific absorption rate, and P(i) represents the actual transmit power of the i-th time unit, which is included in the first time period.

[0044] In one possible design, the method further includes: determining the energy margin based on the transmit power of the first channel. The first channel is located during the first time period, and the first channel includes at least one of a Physical Uplink Control Channel (PUCCH) and a Physical Uplink Shared Channel (PUSCH).

[0045] In one possible design, the energy margin satisfies: T·SAR-∑ T P(i)-P reserve

[0046] Where T represents the duration of the first time period, SAR represents the power limit of the specific absorption rate, P(i) represents the actual transmit power of the i-th time unit, which is included in the first time period, and P reserve This indicates the transmit power of the first channel.

[0047] Fourthly, a communication method is provided. This method can be executed by a network device, by a component within the network device (e.g., a processor, chip, or chip system), or by a logic module or software capable of implementing all or part of the functions of the network device. The following description uses the network device as the executing entity. The method includes:

[0048] The system receives a third maximum transmit power and a fifth power margin, which are determined based on a second maximum transmit power, which is greater than a first maximum transmit power. Based on the third maximum transmit power and the fifth power margin, a fifth Transmission Power Control (TPC) command is determined. The fifth TPC command is then sent.

[0049] In one possible design, the method further includes receiving the second maximum transmit power.

[0050] The technical effects of any design method in the fourth aspect can be seen in the technical effects of any design method in the third aspect, and will not be repeated here.

[0051] Fifthly, a communication device is provided for implementing the various methods described above. The communication device includes modules, units, or means corresponding to the methods, which can be implemented in hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the functions.

[0052] In one possible design, the communication device may include a processing module and a transceiver module. The processing module can be used to implement the processing functions performed by the communication device in any of the above aspects and any possible implementations thereof. The transceiver module, also referred to as a transceiver unit, is used to implement the sending and / or receiving functions performed by the communication device in any of the above aspects and any possible implementations thereof. The transceiver module may consist of transceiver circuitry, a transceiver, a transceiver unit, or a communication interface.

[0053] In one possible design, the transceiver module includes a transmitting module and / or a receiving module, which are used to implement the transmitting or receiving functions performed by the communication device in any of the above aspects and any possible implementations thereof.

[0054] In a sixth aspect, a communication device is provided for implementing the method performed by the communication device in any of the above aspects or any possible design of any of the above aspects.

[0055] In a seventh aspect, a communication device is provided, comprising: a processor; the processor being configured to execute a computer program or instructions to cause the communication device to perform the method described in any aspect or the method performed by the communication device in any possible design of any aspect.

[0056] Optionally, the communication device further includes a memory, which may be coupled to the processor, or the memory may exist independently of the processor; for example, the memory and the processor may be two separate modules. The memory may be located outside or inside the communication device.

[0057] Eighthly, a computer-readable storage medium is provided. This computer-readable storage medium stores a computer program or instructions that, when executed, cause the methods described in any of the preceding aspects or the methods executed by a communication device in any possible design of any of the preceding aspects to be implemented.

[0058] Ninthly, a computer program product containing instructions is provided, which, when run, causes the method described in any of the preceding aspects or the method executed by a communication device in any possible design of any of the preceding aspects to be implemented.

[0059] The communication device provided in any of the fifth to seventh aspects can be a terminal as described in the first or third aspect, or a component included in the terminal, such as a chip or chip system. Alternatively, the communication device can be a network device as described in the second or fourth aspect, or a component included in the network device, such as a chip or chip system. Wherein, when the device is a chip system, it can be composed of chips or may include chips and other discrete devices.

[0060] It is understandable that when the communication device provided in any of the fifth to seventh aspects is a chip, the sending action / function of the communication device can be understood as outputting information, and the receiving action / function of the communication device can be understood as inputting information.

[0061] The technical effects of any of the design methods in aspects five through nine can be seen in the technical effects of any of the design methods in aspects one through four, and will not be repeated here. Attached Figure Description

[0062] Figure 1 is a schematic diagram of the architecture of a communication system provided in an embodiment of this application;

[0063] Figure 2 is a schematic diagram of a power margin provided in an embodiment of this application;

[0064] Figure 3 is a schematic diagram illustrating the principle of a specific absorption rate evaluation method provided in an embodiment of this application;

[0065] Figure 4 is a schematic diagram illustrating the principle of another specific absorption rate evaluation method provided in the embodiments of this application;

[0066] Figure 5 is a flowchart illustrating a communication method provided in an embodiment of this application;

[0067] Figure 6 is a schematic diagram of a working mode switching process provided in an embodiment of this application;

[0068] Figure 7 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0069] Figure 8 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0070] Figure 9 is a schematic diagram of the principle of energy margin provided in an embodiment of this application;

[0071] Figure 10 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0072] Figure 11 is a schematic diagram of a transmission power control process provided in an embodiment of this application;

[0073] Figure 12 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0074] Figure 13 is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0075] Figure 14 is a schematic diagram of another communication device provided in an embodiment of this application. Detailed Implementation

[0076] Figure 1 is a schematic diagram of the architecture of a communication system 1000 provided in an embodiment of this application. As shown in Figure 1, the communication system 1000 includes a radio access network (RAN) 100, wherein the RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110), and may also include at least one terminal (120a-120j in Figure 1, collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). The terminal 120 is wirelessly connected to the RAN node 110. Terminals and RAN nodes can be interconnected via wired or wireless means. The communication system 1000 may also include a core network 200. The RAN node 110 is connected to the core network 200 via wireless or wired means. The core network equipment in core network 200 and the RAN node 110 in RAN 100 can be independent and different physical devices, or they can be the same physical device that integrates the logical functions of the core network equipment and the logical functions of the RAN node. Communication system 1000 may also include Internet 300.

[0077] RAN100 can be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, or a future radio access system as defined in the 3rd generation partnership project (3GPP), or it can be a WiFi system. RAN100 can also include two or more of the above-mentioned different radio access systems. RAN100 can also be an open RAN (O-RAN).

[0078] RAN nodes, also known as radio access network devices, RAN entities, or access nodes, are used to help terminals access communication systems wirelessly. In one application scenario, an RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. RAN nodes can be macro base stations (as shown in Figure 1, 110a), micro base stations or indoor stations (as shown in Figure 1, 110b), relay nodes, or donor nodes.

[0079] In another application scenario, multiple RAN nodes can collaborate to help terminals achieve wireless access, with different RAN nodes implementing different functions of the base station. For example, a RAN node can be a central unit (CU), a distributed unit (DU), or a radio unit (RU). Here, the CU performs the functions of the base station's Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP), and can also perform the functions of the Service Data Adaptation Protocol (SDAP). The DU performs the functions of the base station's Radio Link Control (RANC) and Medium Access Control (MAC) layers, and can also perform some or all of the physical layer functions. For specific descriptions of these protocol layers, refer to the relevant 3GPP technical specifications. The RU can be used to implement radio frequency signal transmission and reception. The CU and DU can be two independent RAN nodes or integrated into the same RAN node, such as within a baseband unit (BBU). The RU can be included in radio frequency equipment, such as in a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes: CU-control plane and CU-user plane.

[0080] In different systems, RAN nodes may have different names. For example, in an O-RAN system, a CU can be called an open CU (O-CU), a DU can be called an open DU (O-DU), and an RU can be called an open RU (O-RU). The RAN nodes in the embodiments of this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules. For example, a RAN node can be a server loaded with the corresponding software modules. The embodiments of this application do not limit the specific technology or device form used in the RAN nodes. For ease of description, a base station is used as an example of a RAN node in the following description.

[0081] A terminal is a device with wireless transceiver capabilities, capable of sending signals to or receiving signals from a base station. Terminals can also be called terminal equipment, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, etc. Terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, wearable devices, vehicles, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the specific technology or device form used in the terminal.

[0082] Base stations and terminals can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can be deployed on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of the base stations and terminals.

[0083] The roles of base stations and terminals can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminals 120j that access the wireless access network 100 through 120i, terminal 120i is a base station; however, for base station 110a, 120i is a terminal, meaning that 110a and 120i communicate via a wireless air interface protocol. Of course, 110a and 120i can also communicate via a base station-to-base station interface protocol. In this case, relative to 110a, 120i is also a base station. Therefore, both base stations and terminals can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be called communication devices with base station functions, and 120a-120j in Figure 1 can be called communication devices with terminal functions.

[0084] Communication between base stations and terminals, between base stations, and between terminals can be conducted using licensed spectrum, unlicensed spectrum, or both simultaneously. Communication can be conducted using spectrum below 6 GHz, spectrum above 6 GHz, or both simultaneously. The embodiments of this application do not limit the spectrum resources used for wireless communication.

[0085] In the embodiments of this application, the functions of the base station can be executed by modules (such as chips) within the base station, or by a control subsystem that includes base station functions. This control subsystem, including base station functions, can be a control center in the aforementioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. Similarly, the functions of the terminal can be executed by modules (such as chips or modems) within the terminal, or by a device that includes terminal functions.

[0086] In this application, the base station sends downlink signals or downlink information to the terminal, with the downlink information carried on the downlink channel; the terminal sends uplink signals or uplink information to the base station, with the uplink information carried on the uplink channel. To communicate with the base station, the terminal needs to establish a radio connection on a cell controlled by the base station. The cell with which the terminal has established a radio connection is called the terminal's serving cell. When the terminal communicates with this serving cell, it is also susceptible to interference from signals from neighboring cells.

[0087] It is understood that in the embodiments of this application, the physical uplink control channel (PUCCH) is only an example of an uplink control channel. In different systems and different scenarios, the control channel may have different names, and the embodiments of this application do not limit this.

[0088] To facilitate understanding of the embodiments of this application, the terminology used in the embodiments of this application will be briefly explained below. It should be understood that these explanations are only for the purpose of understanding the embodiments of this application and should not constitute any limitation on this application.

[0089] 1. Power headroom (PH) and power headroom report (PHR)

[0090] The power margin report indicates the power margin, which represents the difference between the terminal's maximum allowed transmit power and the currently assessed transmit power of the physical uplink shared channel (PUSCH) or sounding reference signal (SRS). It indicates how much transmit power the terminal has available beyond the transmit power currently used for PUSCH / SRS transmission.

[0091] As shown in Figure 2, when the maximum allowed transmit power of the terminal is greater than the evaluated PUSCH transmit power, the power margin is a positive value. In this case, the terminal still has power margin to allocate, and the amount of transmission resources allocated to the terminal can be increased when the network device allocates transmission resources to the terminal.

[0092] If the maximum allowable transmit power of the terminal is less than the assessed PUSCH transmit power, the power margin is negative. In this case, the transmit power required for the uplink transmission rate scheduled by the network device for the terminal exceeds the maximum allowable transmit power of the terminal. Subsequently, when the network device allocates transmission resources to the terminal, it needs to reduce the amount of transmission resources allocated to the terminal.

[0093] 2. Electromagnetic radiation regulations and safety regulations

[0094] The terminal's transmission power must meet electromagnetic radiation regulations and safety regulations.

[0095] Among the indicators in electromagnetic radiation regulations are specific absorption ratio (SAR) and power density (PD). SAR refers to the electromagnetic energy absorbed per unit mass of biological tissue, measured in W / kg. PD refers to the power per unit area perpendicular to the direction of propagation, measured in W / m². 2 .

[0096] For example, the electromagnetic radiation regulatory limits for different regions are shown in Table 1:

[0097] Table 1

[0098] As shown in Table 1, in geographical region 1, for frequency bands below 6 GHz, the SAR limit for human body parts such as the head, body, or limbs is 2 W / kg. Here, 2 W / kg@10g can be understood as the SAR limit being 2 W / kg, and all biological tissues with a minimum test unit of 10g must meet this SAR limit.

[0099] Safety regulations constrain the surface temperature of components accessible to the human body, as shown in Table 2:

[0100] Table 2

[0101] As shown in Table 2, the surface temperature of the components on the terminal that come into contact with the human body should not exceed 48°C.

[0102] 3. SAR Assessment Methods

[0103] For a terminal, if the average transmit power of the terminal does not exceed the SAR index over a period of time, then the transmit power of the terminal complies with SAR regulations.

[0104] Taking Figure 3 or Figure 4 as an example, the power limit corresponding to the SAR index is assumed to be 23 dBm. This can be understood as follows: in one SAR cycle, the average transmit power of the terminal must not exceed 23 dBm to comply with SAR regulations. One SAR cycle can be 6 minutes (min) or other durations.

[0105] If a terminal's transmit power never exceeds 23 dBm, then the terminal complies with SAR regulations, as shown in Figure 3.

[0106] If the transmit power of a terminal varies over a SAR period, for example, exceeding 23 dBm in some time periods and not exceeding 23 dBm in others, but the average value over the SAR period does not exceed 23 dBm, then the terminal also complies with SAR regulations, as shown in Figure 4.

[0107] In other words, for terminals, electromagnetic radiation regulations limit their transmission power, affecting uplink coverage performance and range, resulting in a poor user experience.

[0108] In view of this, this application provides a communication method. This method can be applied to the system shown in Figure 1. In this method, the same terminal is configured with two maximum transmission powers, namely a first maximum transmission power and a second maximum transmission power. The terminal determines a first power margin based on the first maximum transmission power and transmits the first power margin. Then, the terminal receives first indication information, and upon receiving the first indication information, determines a second power margin based on the second maximum transmission power and transmits the second power margin. The second maximum transmission power is greater than the first maximum transmission power.

[0109] Below, with reference to Table 3, we introduce the two maximum transmit powers involved in this application, and the corresponding operating modes for different maximum transmit powers:

[0110] First, the first maximum transmit power and the first operating mode.

[0111] In this application, the terminal determines a first power margin based on a first maximum transmit power and transmits the first power margin. This can be understood as the terminal being in a first operating mode, or in a normal operating mode, or in a normal state. The following description uses the first operating mode as an example.

[0112] The first maximum transmit power is the maximum transmit power of the terminal in the first operating mode. It can be understood as the legacy maximum transmit power, denoted as Legacy P. cmax For example, the first maximum transmit power includes one of the following: 23dBm, 26dBm, or 29dBm, as shown in Table 3. Other values ​​for the first maximum transmit power are also possible and are not limited. The first transmit power can be determined based on at least one of the following parameters: P EMAX,c P PowerClass , or ΔP PowerClass Among them, P EMAX,c This indicates the maximum transmit power of the serving cell, such as 23dBm or 26dBm. P PowerClass This indicates the maximum power output of the terminal, such as 26dBm or 29dBm. ΔP PowerClass This indicates the offset value of the terminal's maximum power, such as 3dB or 6dB.

[0113] In the first operating mode, the terminal is able to transmit uplink data at a lower transmit power, thereby minimizing the terminal's average transmit power to meet SAR and temperature safety regulations.

[0114] Optionally, the duration of the first operating mode is unlimited and unrestricted, as shown in Table 3. Typically, the duration of the first operating mode is relatively long, such as 1 minute. This can be understood as the terminal spending most of its time in the first operating mode to reduce the terminal's average transmit power, thereby enabling the terminal to meet SAR regulations and temperature safety regulations as much as possible.

[0115] Optionally, when performing uplink transmission based on the first operating mode, the modulation and coding scheme (MCS) used is unrestricted and unconstrained, as shown in Table 3. For example, a lower MCS, such as quadrature amplitude modulation (QAM), can be used, or a higher MCS, such as 256QAM, can be used.

[0116] Optionally, when performing uplink transmission based on the first operating mode, the location of the occupied resources is unrestricted and unconstrained, as shown in Table 3. For example, it can occupy the center frequency band of the carrier bandwidth or the edge position of the carrier bandwidth.

[0117] Second, the second maximum transmit power and the second operating mode

[0118] In this application, the terminal determines a second power margin based on a second maximum transmit power and transmits the second power margin. This can be understood as the terminal being in a second operating mode, a high-power operating mode, or a high-power transmission (HPT) state. The following description uses the second operating mode as an example.

[0119] The second maximum transmit power is greater than the first maximum transmit power. The second maximum transmit power is the maximum transmit power of the terminal in the second operating mode. However, the terminal is in the second operating mode for a very short period of time. Therefore, the second maximum transmit power can be understood as the instantaneous maximum transmit power, denoted as instantaneous P. cmax For example, the second maximum transmit power includes one of the following: 31dBm, 32dBm, 33dBm, or 34dBm. Other values ​​for the second maximum transmit power are not limited. The second transmit power can be determined based on at least one of the following parameters: P EMAX,c P PowerClass , or ΔP PowerClass Among them, P EMAX,c This indicates the maximum transmit power of the serving cell, such as 23dBm or 26dBm. P PowerClass This indicates the maximum power output of the terminal, such as 26dBm or 29dBm. ΔP PowerClass This indicates the offset value of the terminal's maximum power, such as 3dB or 6dB.

[0120] In the second operating mode, the terminal can transmit uplink data at a higher transmit power, thereby improving uplink coverage performance and range. However, the transmit power of the terminal in the second operating mode may exceed the SAR power limit.

[0121] Optionally, the duration of the second operating mode is shorter, as shown in Table 3. For example, the duration of the second operating mode is short, such as 20ms or 100ms, so that the terminal is in the first operating mode most of the time, thereby meeting SAR power limits and temperature safety regulations as much as possible.

[0122] Optionally, when uplink transmission is performed based on the second operating mode, a lower MCS is used, for example, a maximum MCS of 16QAM, thereby reducing the constraints on error vector magnitude (EVM) or adjacent channel leakage power ratio (ACLR).

[0123] Optionally, when performing uplink transmission based on the second working mode, the location of the frequency domain resources used by the terminal can be restricted. For example, the occupied resource location can be the center frequency domain location of the carrier bandwidth to avoid occupying the edge location of the carrier bandwidth, thereby reducing the impact on intermodulation distortion (IMD) or ACLR. The specific available frequency domain bandwidth can be reported by the terminal capability or predefined.

[0124] Table 3

[0125] In other words, the terminal can switch between different operating modes. For example, upon receiving a first indication, it can switch from a first operating mode to a second operating mode. Because the terminal can transmit uplink at higher power in the second operating mode, it achieves better uplink coverage performance. Furthermore, even if the terminal's transmit power in the second operating mode exceeds the SAR power limit, the terminal spends very little time in the second operating mode and most of the time in the first operating mode. Since the transmit power in the first operating mode is typically less than or far less than the SAR power limit, the terminal's average transmit power within a SAR cycle is low, still meeting SAR regulations and temperature safety regulations.

[0126] The communication method proposed in this application embodiment will now be described in detail with reference to Figure 5. The communication method 500 proposed in this application embodiment includes the following operations:

[0127] S501, The terminal determines the first power margin based on the first maximum transmit power.

[0128] The terminal can be referred to in Figure 1, and will not be described in detail here.

[0129] The first maximum transmit power is the maximum transmit power of the terminal in the first operating mode, as described in Table 3, and will not be repeated here. The first transmit power can be determined based on at least one of the following parameters: P EMAX,c P PowerClass , or ΔP PowerClass Among them, P EMAX,c This indicates the maximum transmit power of the serving cell, such as 23dBm or 26dBm. P PowerClass This indicates the maximum power output of the terminal, such as 26dBm or 29dBm. ΔP PowerClass This indicates the offset value of the terminal's maximum power, such as 3dB or 6dB.

[0130] It should be understood that in this application, the first maximum transmit power can be configured by the network device or it can be predefined. Similarly, parameters related to the first maximum transmit power, such as P... EMAX,c P PowerClass , or ΔP PowerClass These parameters can be configured by the network device or predefined.

[0131] Optionally, the terminal spends most of its time in the first working mode. For example, the duration of the first working mode is 1 minute.

[0132] For example, the first power margin satisfies: PH1 = P cmax1 –P1 Formula (1)

[0133] Where PH1 represents the first power margin, P cmax1 P1 represents the first maximum transmit power, and P2 represents the transmit power currently evaluated by the terminal, which is used by the terminal to perform uplink transmission.

[0134] Taking Figure 6 as an example, during the time period between t1 and t2, the terminal is in the first working mode, and the terminal determines the first power margin based on the first maximum transmission power. The first maximum transmission power is shown as a thin dashed line.

[0135] For the terminal, after determining the first power margin, it executes S502:

[0136] S502, The terminal sends a first power margin to the network device. Correspondingly, the network device receives the first power margin from the terminal.

[0137] The network device can be the RAN node in Figure 1, as detailed in Figure 1.

[0138] For example, the first power margin is included in the first power margin report. The terminal reports the first power margin to the network device through the first power margin report.

[0139] Optionally, after receiving the first power margin, the network device determines a first transmit power control (TPC) command based on the first power margin and sends the first TPC command to the terminal. The first TPC command indicates the terminal's transmit power. Accordingly, the terminal determines its transmit power based on the first TPC command and performs uplink transmission.

[0140] S503, the network device sends a first instruction message to the terminal. Correspondingly, the terminal receives the first instruction message from the network device.

[0141] The first indication information is used to trigger or instruct the terminal to switch states. For example, the first indication information instructs the terminal to determine a second power margin based on a second maximum transmission power. Alternatively, the first indication information instructs the terminal to enable or activate a second operating mode. Or, the first indication information instructs the terminal to stop or exit a first operating mode.

[0142] For example, the first indication information is carried in one of the following: radio resource control (RRC), or MAC control element (CE), or downlink control information (DCI).

[0143] Taking the first instruction information carried on RRC as an example, it can be understood that the network device configures the terminal to start the second working mode through RRC. Taking the first instruction information carried on MAC CE or DCI as an example, it can be understood that the network device activates the terminal to start the second working mode through MAC CE or DCI.

[0144] Taking Figure 6 as an example, at time t2, the network device sends the first instruction information to the terminal.

[0145] S504. Upon receiving the first instruction information, the terminal determines the second power margin based on the second maximum transmission power.

[0146] The second maximum transmit power is greater than the first maximum transmit power. The second maximum transmit power is the maximum transmit power of the terminal in the second operating mode, as described in Table 3, and will not be repeated here. The second transmit power can be determined based on at least one of the following parameters: P EMAX,c P PowerClass , or ΔP PowerClass Among them, P EMAX,cThis indicates the maximum transmit power of the serving cell, such as 23dBm or 26dBm. P PowerClass This indicates the maximum power output of the terminal, such as 26dBm or 29dBm. ΔP PowerClass This indicates the offset value of the terminal's maximum power, such as 3dB or 6dB.

[0147] It should be understood that in this application, the second maximum transmit power can be configured by the network device or it can be predefined. Similarly, parameters related to the second maximum transmit power, such as P... EMAX,c P PowerClass , or ΔP PowerClass These parameters can be configured by the network device or predefined.

[0148] Optionally, the terminal is in the second operating mode for very limited time. For example, the duration of the second operating mode is predefined as a fixed duration, such as 20ms or 100ms. The duration of the second operating mode can also be associated with the second maximum transmit power, or the duration of the second operating mode can also be associated with parameters related to the second maximum transmit power. The parameters related to the second maximum transmit power include at least one of the following: P EMAX,c P PowerClass , or ΔP PowerClass wait.

[0149] For example, 31dBm@100ms means that in the second operating mode, the second maximum transmit power is 31dBm and the duration is 100ms.

[0150] For example, 34dBm@20ms means that in the second working mode, the second maximum transmit power is 34dBm and the duration is 20ms.

[0151] For example, the second power margin satisfies: PH2 = P cmax2 –P2 formula (2)

[0152] Where PH2 represents the second power margin, P cmax2 P2 represents the second maximum transmit power, and P2 represents the transmit power currently evaluated by the terminal, which is used by the terminal to perform uplink transmission.

[0153] Taking Figure 6 as an example, during the time period between t2 and t3, the terminal is in the second operating mode, and the terminal determines the second power margin based on the second maximum transmission power. The second maximum transmission power is shown by the thick dashed line.

[0154] For the terminal, after determining the second power margin, it executes S505:

[0155] S505: The terminal sends a second power margin to the network device. Correspondingly, the network device receives the second power margin from the terminal.

[0156] For example, the second power margin is included in the second power margin report. The terminal reports the second power margin to the network device through the second power margin report.

[0157] Optionally, after receiving the second power margin, the network device determines a second TPC command based on the second power margin and sends the second TPC command to the terminal. The second TPC command indicates the terminal's transmit power. Accordingly, the terminal determines its transmit power based on the second TPC command and performs uplink transmission, thereby achieving better uplink coverage performance.

[0158] In other words, the terminal can switch from the first operating mode to the second operating mode to achieve better uplink coverage performance. Furthermore, the terminal operates in the first operating mode most of the time, and the transmit power in the first operating mode is typically less than or far less than the SAR power limit. Therefore, within a SAR cycle, the terminal's average transmit power is low, still meeting SAR regulations and temperature safety regulations.

[0159] In some embodiments, the terminal can also switch from a second operating mode to a first operating mode, as shown in FIG7. This application further includes the following operations:

[0160] Scenario 1: The network device instructs the terminal to switch via signaling. The specific process is as follows:

[0161] S511, The network device sends a second instruction message to the terminal. Accordingly, the terminal receives the second instruction message from the network device.

[0162] The second indication information is used to trigger or instruct the terminal to switch states. For example, the second indication information instructs the terminal to determine a third power margin based on the first maximum transmission power. Alternatively, the second indication information instructs the terminal to activate or enable the first operating mode. Or, the second indication information instructs the terminal to stop or exit the second operating mode.

[0163] For example, the second indication information is carried in one of the following: RRC, MAC CE, or DCI.

[0164] Taking the second instruction information carried on RRC as an example, it can be understood that the network device reconfigures the terminal to start the first working mode through RRC. Taking the second instruction information carried on MAC CE or DCI as an example, it can be understood that the network device instructs the terminal to start the first working mode through MAC CE or DCI.

[0165] It should be understood that in some embodiments, taking the first signaling as an example, a new field is added to the first signaling, denoted as the first field. If the first field has a first value, then the first field with the first value is interpreted as first indication information. Alternatively, if the first field has a second value, then the first field with the second value is interpreted as second indication information. That is, the network device instructs the terminal to switch using the same field in the same signaling. For example, if the first field has a first value, it means that the network device sends first indication information to cause the terminal to switch from a first operating mode to a second operating mode. Similarly, if the first field has a second value, it means that the network device sends second indication information to cause the terminal to switch from a second operating mode to a first operating mode. The first field occupies at least one bit; for example, the first field occupies 1 bit, with a first value of 0 and a second value of 1, or a first value of 1 and a second value of 0. The first signaling includes one of the following: RRC, MAC CE, or DCI.

[0166] It should be understood that in some embodiments, taking the first signaling as an example, a new field is added to the first signaling, denoted as the first field. The first signaling with the added first field is interpreted as first indication information. Alternatively, the first signaling without the added first field is interpreted as second indication information. That is, the network device instructs the terminal to switch by whether or not the first field is added to the same signaling. For example, adding the first field to the first signaling means that the network device sends first indication information to cause the terminal to switch from a first operating mode to a second operating mode. Conversely, not adding the first field to the first signaling means that the network device sends second indication information to cause the terminal to switch from a second operating mode to a first operating mode. The first field occupies at least one bit. The first signaling includes one of the following: RRC, MAC CE, or DCI.

[0167] Taking Figure 6 as an example, at time t3, the network device sends the second instruction information to the terminal.

[0168] S512. Upon receiving the second instruction information, the terminal determines the third power margin based on the first maximum transmission power.

[0169] For example, the third power margin satisfies: PH3 = P cmax1 –P3 formula (3)

[0170] Where PH3 represents the third power margin, P cmax1 P1 represents the first maximum transmit power, and P3 represents the transmit power currently evaluated by the terminal, which is used by the terminal to perform uplink transmission.

[0171] Taking Figure 6 as an example, during the time period between t3 and t4, the terminal is in the first working mode, and the terminal determines the third power margin based on the first maximum transmission power. The first maximum transmission power is shown as a thin dashed line.

[0172] For the terminal, after determining the third power margin, it executes S513:

[0173] S513, The terminal sends a third power margin to the network device. Accordingly, the network device receives the third power margin from the terminal.

[0174] For example, the third power margin is included in the third power margin report. The terminal reports the third power margin to the network device through the third power margin report.

[0175] Optionally, after receiving the third power margin, the network device determines a third TPC command based on the third power margin and sends the third TPC command to the terminal. The third TPC command indicates the terminal's transmit power. Accordingly, the terminal determines its transmit power based on the third TPC command and performs uplink transmission.

[0176] In other words, in scenario 1, the network device instructs the terminal to switch via the second instruction information to achieve the switch from the second working mode to the first working mode.

[0177] Scenario 2: The terminal determines to perform the handover based on the first timer. The specific process is as follows:

[0178] S521. When the first timer reaches the first duration, the terminal determines the third power margin based on the first maximum transmit power.

[0179] The start time of the first timer is the time when the first indication information is received.

[0180] Alternatively, the start time of the first timer may be the start time of the first uplink transmission. The first uplink transmission is the first uplink transmission after receiving the first indication information. The start time of the first uplink transmission can be the start time of the first uplink transmission, the end time of the first uplink transmission, the start time of the time slot in which the first uplink transmission occurs, or the end time of the time slot in which the first uplink transmission occurs.

[0181] The first duration can be a predefined duration or can be configured by the network device, such as through RRC, MAC CE, or DCI signaling. It can be understood as the duration of the second operating mode. For example, the first duration could be 20ms or 100ms.

[0182] For example, the process of determining the third power margin can be found in the introduction of formula (3), and will not be repeated here.

[0183] Taking Figure 6 as an example, the first duration is the time between t2 and t3. At time t2, the first timer is started or restarted. At time t3, the first timer's runtime reaches the first duration. The terminal switches from the second operating mode to the first operating mode at time t3. During the time period between t3 and t4, the terminal is in the first operating mode, and the terminal determines the third power margin based on the first maximum transmit power. The first maximum transmit power is shown by the thin dashed line.

[0184] For the terminal, after determining the third power margin, it executes S522:

[0185] S522, The terminal sends a third power margin to the network device. Accordingly, the network device receives the third power margin from the terminal.

[0186] For S522, please refer to the description of S513, which will not be repeated here.

[0187] In other words, in scenario 2, the terminal determines the switching based on the first timer to achieve the switching from the second working mode to the first working mode.

[0188] Scenario 3: The terminal autonomously determines to perform the handover, and the specific process is as follows:

[0189] S531, The terminal sends third instruction information to the network device. Accordingly, the network device receives the third instruction information from the terminal.

[0190] The third instruction information instructs the terminal to stop determining the second power margin based on the second maximum transmission power, so as to report to the terminal to exit the second working mode through the third instruction information.

[0191] Alternatively, the third instruction information instructs the terminal to (start) determine the third power margin based on the first maximum transmission power, so as to report to the terminal via the third instruction information to enter the first working mode.

[0192] For example, the third instruction information is carried on the MAC CE or the PUCCH.

[0193] For example, S531 includes:

[0194] For example, when the terminal's temperature reaches a third value, the terminal sends a third indication message, indicating that the terminal has begun to determine a third power margin based on the first maximum transmit power. The third value is 45°C, or another value, to prevent the terminal from overheating.

[0195] For example, when the terminal's power consumption reaches the fourth value, the terminal sends a third indication message, indicating that the terminal has begun to determine the third power margin based on the first maximum transmit power. The fourth value is 40dBm, or another value, to prevent excessive power consumption and overheating of the terminal.

[0196] S532. Under the condition of sending the third instruction information, the terminal determines the third power margin based on the first maximum transmission power.

[0197] In other words, the transmission of the third instruction information triggers the terminal to determine the third power margin based on the first maximum transmission power.

[0198] For example, the process of determining the third power margin can be found in the introduction of formula (3), and will not be repeated here.

[0199] Taking Figure 6 as an example, at time t3, the terminal's temperature reaches the third value, or the terminal's power consumption reaches the fourth value. In this case, the terminal switches at time t3 from the second operating mode to the first operating mode. During the time period between t3 and t4, the terminal is in the first operating mode, and the terminal determines the third power margin based on the first maximum transmit power. The first maximum transmit power is shown by the thin dashed line.

[0200] For the terminal, after determining the third power margin, it executes S533:

[0201] S533: The terminal sends a third power margin to the network device. Correspondingly, the network device receives the third power margin from the terminal.

[0202] For S533, please refer to the introduction of S513, and it will not be repeated here.

[0203] In other words, in scenario 3, the terminal determines to perform a handover upon sending the third instruction information, thereby switching from the second operating mode to the first operating mode. Furthermore, the terminal also reports its current operating mode to the network device via the third instruction information, enabling the network device to be aware of the terminal's operating mode.

[0204] In some embodiments, the terminal can also switch from the first operating mode to the second operating mode, as shown in FIG8. This application further includes the following operations:

[0205] Scenario 4: The terminal autonomously determines to perform the handover, and the specific process is as follows:

[0206] S541. The terminal sends a fourth instruction message to the network device. Accordingly, the network device receives the fourth instruction message from the terminal.

[0207] The fourth instruction information instructs the terminal to stop determining the third power margin based on the first maximum transmission power, so as to report to the terminal to exit the first working mode through the fourth instruction information.

[0208] Alternatively, the fourth instruction information instructs the terminal to (start) determine the fourth power margin based on the second maximum transmission power, so as to report to the terminal via the fourth instruction information to enter the second working mode.

[0209] For example, the fourth instruction information is carried in one of the following: MAC CE, or PUCCH.

[0210] For example, S541 includes:

[0211] For example, when the terminal's temperature reaches the fifth value, the terminal sends a fourth indication message, indicating that the reporting terminal has begun to determine a fourth power margin based on the second maximum transmit power. Here, the fifth value is 35°C, or another value. In other words, when the terminal's temperature is relatively low, it can be enabled to enter a second operating mode, transmitting uplink data at a higher power to achieve better uplink coverage performance.

[0212] For example, when the terminal's power consumption reaches the sixth value, the terminal sends a fourth indication message, indicating that the reporting terminal has begun to determine the fourth power margin based on the second maximum transmit power. Here, the sixth value is 20dBm, or another value. In other words, when the terminal's power consumption is relatively low, it can be enabled to enter the second operating mode, performing uplink transmission with a higher transmit power to achieve better uplink coverage performance.

[0213] S542. Under the condition of sending the fourth instruction information, the terminal determines the fourth power margin based on the second maximum transmission power.

[0214] In other words, the transmission of the fourth indication information triggers the terminal to determine the fourth power margin based on the second maximum transmission power.

[0215] For example, the fourth power margin satisfies: PH4 = P cmax2 –P4 formula (4)

[0216] Where PH4 represents the fourth power margin, P cmax2 P4 represents the second maximum transmit power, and P4 represents the transmit power currently evaluated by the terminal, which is used by the terminal to perform uplink transmission.

[0217] For the terminal, after determining the fourth power margin, it executes S543:

[0218] S543. The terminal sends a fourth power margin to the network device. Accordingly, the network device receives the fourth power margin from the terminal.

[0219] For example, the fourth power margin is included in the fourth power margin report. The terminal reports the fourth power margin to the network device through the fourth power margin report.

[0220] Optionally, after receiving the fourth power margin, the network device determines a fourth TPC command based on the fourth power margin and sends the fourth TPC command to the terminal. The fourth TPC command indicates the terminal's transmit power. Accordingly, the terminal determines its transmit power based on the fourth TPC command and performs uplink transmission, thereby achieving better uplink coverage performance.

[0221] In other words, in scenario 4, the terminal determines to perform a handover upon sending the fourth instruction information, thereby switching from the first operating mode to the second operating mode. Furthermore, the terminal reports its current operating mode to the network device via the fourth instruction information, enabling the network device to be aware of the terminal's operating mode.

[0222] Scenario 5: The network device instructs the terminal to switch via signaling. The specific process is as follows:

[0223] S551, the network device sends the fifth instruction information to the terminal. Accordingly, the terminal receives the fifth instruction information from the network device.

[0224] The fifth indication information is used to instruct or trigger the terminal to switch states. For example, the fifth indication information instructs the terminal to determine the fourth power margin based on the second maximum transmit power. Alternatively, the fifth indication information instructs the terminal to enable or activate the second operating mode. Or, the fifth indication information instructs the terminal to stop or exit the first operating mode.

[0225] For example, the fifth instruction information is carried in one of the following: RRC, MAC CE, or DCI.

[0226] Taking the fifth instruction information carried on RRC as an example, it can be understood that the network device reconfigures the terminal to enable the second working mode through RRC. Taking the fifth instruction information carried on MAC CE or DCI as an example, it can be understood that the network device instructs the terminal to enable the second working mode through MAC CE or DCI.

[0227] It should be understood that the fifth instruction information can be found in the description of the first instruction information.

[0228] S552. Upon receiving the fifth instruction information, the terminal determines the fourth power margin based on the second maximum transmission power.

[0229] For example, the process of determining the fourth power margin can be found in formula (4), and will not be repeated here.

[0230] For the terminal, after determining the fourth power margin, it executes S553:

[0231] S553, The terminal sends a fourth power margin to the network device. Accordingly, the network device receives the fourth power margin from the terminal.

[0232] For S553, please refer to the description of S542, which will not be repeated here.

[0233] In other words, in scenario 5, the network device instructs the terminal to switch via the fifth instruction information to achieve the switch from the first working mode to the second working mode.

[0234] It should be understood that, in this application, switching between different operating modes includes: switching from a first operating mode to a second operating mode, and / or switching from a second operating mode to a first operating mode.

[0235] The switching from the first working mode to the second working mode includes two situations: one is that the network device instructs the terminal to switch via signaling, as detailed in situation 5 (or S501-S505); the other is that the terminal autonomously determines to perform the switch, as detailed in situation 4.

[0236] The switching from the second working mode to the first working mode includes three scenarios: one is that the network device instructs the terminal to switch via signaling, as detailed in scenario 1; another is that the terminal determines to perform the switch based on the first timer, as detailed in scenario 2; and the third is that the terminal determines to perform the switch autonomously, as detailed in scenario 3.

[0237] It should be understood that, in this application, the switching order between different working modes can have multiple combinations:

[0238] Combination 1 involves first switching from the first working mode to the second working mode, and then switching back from the second working mode to the first working mode. In other words, the terminal executes either scenario 4 or scenario 5 first, and then scenario 1, scenario 2, or scenario 3.

[0239] Combination 2 involves first switching from the second working mode to the first working mode, and then switching from the first working mode back to the second working mode. In other words, the terminal first executes either case 1, case 2, or case 3, and then executes either case 4 or case 5.

[0240] In this application, combination 1 is used as an example for description and should not be construed as a limitation of this application.

[0241] This application provides another communication method. This method can be applied to the system shown in Figure 1. In this method, the terminal determines a third maximum transmission power based on energy margin, a first maximum transmission power, and a second maximum transmission power. The energy margin indicates the energy margin for a first time period, and the second maximum transmission power is greater than the first maximum transmission power. Then, the terminal determines a fifth power margin based on the third maximum transmission power and transmits both the third maximum transmission power and the fifth power margin.

[0242] The first time period can be a SAR period or a predefined or configured period. In this application, the SAR period is used as an example.

[0243] The first maximum transmission power and the second maximum transmission power can be found in the description of communication method 500, and will not be repeated here.

[0244] The following section, with reference to Figure 9, introduces the energy headroom and energy headroom reporting involved in this application:

[0245] The energy margin report indicates the energy margin, which represents the energy reserve of the terminal in one SAR cycle to ensure that the terminal meets SAR regulations. The energy margin refers to the difference between the total energy allowed for the terminal in one SAR cycle and the actual accumulated transmit energy of the terminal, as shown in Figure 9.

[0246] For example, the energy margin satisfies: EH=T·SAR-∑ T P(i) Formula (5)

[0247] Where EH represents the energy margin, T represents the SAR period length, SAR represents the power limit of the specific absorptivity, P(i) represents the actual transmit power of the i-th time unit, the i-th time unit is included in the SAR period, and ∑ represents the summation operator.

[0248] Optionally, when determining the energy margin, a certain amount of reserved power is also considered, such as the PUCCH used for feedback in the SAR period, or the PUSCH in the scheduling-free period. The PUCCH used for feedback and the PUSCH in the scheduling-free period are denoted as the first channel. In this case, the energy margin satisfies: EH = T·SAR - ∑ T P(i)-P reserve Formula (6)

[0249] Where EH represents the energy margin, T represents the SAR period length, SAR represents the power limit of specific absorptivity, P(i) represents the actual transmit power of the i-th time unit, the i-th time unit is included in the SAR period, ∑ represents the addition operator, P reserve This indicates the transmit power of the first channel.

[0250] In other words, the terminal autonomously determines the third maximum transmit power for uplink transmission. For example, it determines the third maximum transmit power based on the energy margin, the first maximum transmit power, and the second maximum transmit power, and then determines the fifth power margin based on the third maximum transmit power, so that the network device indicates the transmit power to the terminal based on the fifth power margin and the third maximum transmit power.

[0251] Since the second maximum transmit power is greater than the first maximum transmit power, the terminal may transmit uplink at a higher transmit power. For example, when the terminal has a large energy margin in the first time period, the third maximum transmit power, determined based on the energy margin, the first maximum transmit power, and the second maximum transmit power, may be greater than the first maximum transmit power, thus enabling the terminal to transmit uplink at a higher transmit power and achieve better uplink coverage performance.

[0252] Conversely, when the terminal has a small energy margin in the first time period, the third maximum transmission power determined based on the energy margin, the first maximum transmission power, and the second maximum transmission power may be less than or equal to the first maximum transmission power, thus enabling the terminal to transmit uplink at a lower transmission power, thereby meeting SAR regulations and temperature safety regulations.

[0253] The communication method proposed in this application embodiment will now be described in detail with reference to Figures 10 and 11. The communication method 1000 proposed in this application embodiment includes the following operations:

[0254] S1001. The terminal determines the third maximum transmission power based on the energy margin, the first maximum transmission power, and the second maximum transmission power.

[0255] Here, the energy margin indicates the energy margin in the first time period. Taking Figure 9 as an example, the first time period can be a SAR cycle or a time period corresponding to a SAR time window, and the energy margin can be the energy shown by the vertical line.

[0256] The second maximum transmission power is greater than the first maximum transmission power, which can be found in the description of communication method 500, and will not be repeated here.

[0257] Optionally, the second maximum transmit power is one of a plurality of maximum transmit powers. Each of the plurality of maximum transmit powers is greater than the first maximum transmit power. The plurality of maximum transmit powers can be configured by the network device or can be predefined.

[0258] For example, the multiple maximum transmit powers include 31dBm, 32dBm, 33dBm, and 34dBm, but other values ​​are also possible and are not limited. The terminal selects one of the multiple maximum transmit powers as the second maximum transmit power. In some embodiments, the terminal reports the second maximum transmit power to the network device so that the network device is aware of the terminal's capabilities.

[0259] Optionally, the third maximum transmit power is the smaller of the energy margin, the first maximum transmit power, and the second maximum transmit power, so that the terminal can perform uplink transmission at the highest possible transmit power while meeting SAR regulations.

[0260] For the terminal, after determining the third maximum transmit power, it executes steps S1002 and S1003:

[0261] S1002, The terminal sends the third maximum transmit power to the network device. Accordingly, the network device receives the third maximum transmit power from the terminal.

[0262] For example, the third maximum transmit power is included in the fifth power margin report. The terminal reports the third maximum transmit power to the network device through the fifth power margin report.

[0263] S1003. The terminal determines the fifth power margin based on the third maximum transmit power.

[0264] For example, the fifth power margin satisfies: PH5 = P cmax3 –P5 Formula (7)

[0265] Where PH5 represents the fifth power margin, P cmax3 P5 represents the third maximum transmit power, and P5 represents the transmit power currently evaluated by the terminal, which is used by the terminal to perform uplink transmission.

[0266] It should be understood that the terminal can execute S1002 first and then S1003, or it can execute S1003 first and then S1002, or it can execute S1002 and S1003 simultaneously.

[0267] For the terminal, after determining the fifth power margin, it executes S1004:

[0268] S1004. The terminal sends a fifth power margin to the network device. Correspondingly, the network device receives the fifth power margin from the terminal.

[0269] For example, the fifth power margin is included in the fifth power margin report. The terminal reports the fifth power margin to the network device through the fifth power margin report.

[0270] In other words, in this application, the terminal sends a third maximum transmit power and a fifth power margin to the network device, as shown in Figure 11. For details on the terminal sending the third maximum transmit power, please refer to the description of S1002. For details on the terminal sending the fifth power margin, please refer to the description of S1004. The terminal can execute S1002 first, then S1004, or S1004 first, then S1002, or both simultaneously.

[0271] For network devices, after receiving the third maximum transmit power and the fifth power margin, S1005 is executed:

[0272] S1005. The network device determines the fifth TPC command based on the third maximum transmit power and the fifth power margin.

[0273] The fifth TPC command is used to indicate the terminal's transmit power.

[0274] S1006. The network device sends the fifth TPC command to the terminal. Correspondingly, the terminal receives the fifth TPC command from the network device.

[0275] For example, the terminal determines the transmit power according to the fifth TPC command and performs uplink transmission.

[0276] In other words, the terminal determines the third maximum transmit power based on the energy margin, the first maximum transmit power, and the second maximum transmit power. Since the second maximum transmit power is greater than the first maximum transmit power, the terminal may perform uplink transmission at a higher transmit power. Furthermore, because the terminal also considers the energy margin when determining the third maximum transmit power, even if the terminal performs uplink transmission at a higher transmit power, it still meets SAR regulations and temperature safety regulations.

[0277] In some embodiments, as shown in FIG12, for S1001, the terminal determines the third maximum transmission power based on the energy margin, the first maximum transmission power, and the second maximum transmission power, specifically including:

[0278] S10011. The terminal selects a maximum transmission power from the first maximum transmission power and the second maximum transmission power according to its own working status.

[0279] For example, the terminal's operating status includes temperature. The terminal makes selections based on temperature thresholds. These thresholds include a third value and a fifth value. The third value is greater than the fifth value. For example, the third value is 45℃, and the fifth value is 35℃.

[0280] Specifically, when the terminal's temperature reaches the third value, the terminal selects the first maximum transmit power from the first maximum transmit power and the second maximum transmit power. In other words, when the terminal's temperature is relatively high, the terminal can be enabled to transmit uplink data at a lower transmit power to ensure that the terminal complies with SAR regulations and temperature safety regulations as much as possible.

[0281] When the terminal temperature reaches the fifth value, the terminal selects the second maximum transmit power from the first and second maximum transmit power. In other words, when the terminal temperature is relatively low, the terminal can be enabled to transmit uplink at a higher transmit power to achieve better uplink coverage performance.

[0282] For example, the terminal's operating status includes power consumption. The terminal selects based on power thresholds. These power thresholds include a fourth value and a sixth value. The fourth value is greater than the sixth value. For instance, the fourth value might be 40dBm, and the sixth value might be 20dBm.

[0283] Specifically, when the terminal's power consumption reaches the fourth value, the terminal selects the first maximum transmit power from the first maximum transmit power and the second maximum transmit power. In other words, when the terminal's power consumption is relatively high, the terminal can be enabled to perform uplink transmission at a lower transmit power, so that the terminal can meet SAR regulations and temperature safety regulations as much as possible.

[0284] When the terminal's power consumption reaches the sixth value, the terminal selects the second maximum transmit power from the first and second maximum transmit powers. In other words, when the terminal's power consumption is relatively low, it can be enabled to transmit uplink data at a higher transmit power to achieve better uplink coverage performance.

[0285] For the terminal, after selecting a maximum transmit power, it executes S10011:

[0286] S10012. The terminal determines the third maximum transmission power based on the energy margin and the selected maximum transmission power.

[0287] For example, the third maximum transmit power is the smaller of the energy margin and the selected maximum transmit power. For instance, the third maximum transmit power satisfies:

[0288] Among them, P cmax3This indicates the third maximum transmit power, min() is the smaller value operator, EHR indicates the energy margin, select() is the selection operator, and P cmax Indicates the first maximum transmission power. This indicates the second maximum transmission power.

[0289] In other words, the third maximum transmit power is the smaller of the energy margin, the first maximum transmit power, and the second maximum transmit power, so that the terminal can transmit uplink at the highest possible transmit power while meeting SAR regulations.

[0290] It is understood that, in order to achieve the functions in the above embodiments, the network devices and terminals include hardware structures and / or software modules corresponding to perform each function. Those skilled in the art should readily recognize that, based on the units and method steps described in conjunction with the embodiments disclosed in this application, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0291] Figures 13 and 14 are schematic diagrams illustrating possible communication devices provided in embodiments of this application. These communication devices can be used to implement the functions of terminals or network devices in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of this application, the communication device can be a terminal as shown in Figure 1, a network device as shown in Figure 1, or a module (such as a chip) applied to a terminal or network device.

[0292] As shown in Figure 13, the communication device 1300 includes a processing unit 1310 and a transceiver unit 1320. The communication device 1300 is used to implement the functions of the terminal or network device in the method embodiments shown in Figures 5, 7, 8, 10, and 12.

[0293] When the communication device 1300 is used to implement the functions of the terminal in the method embodiment shown in FIG5: the transceiver unit 1320 is used to execute S502, S503 and S505, and the processing unit 1310 is used to execute S501 and S504.

[0294] When the communication device 1300 is used to implement the function of the network device in the method embodiment shown in FIG5: the transceiver unit 1320 is used to execute S502, S503 and S505, and the processing unit 1310 is used to determine the first instruction information.

[0295] When the communication device 1300 is used to implement the functions of the terminal in the method embodiment shown in FIG7: the transceiver unit 1320 is used to execute S502, S503, S505, S511, S513, S522, S531 and S533, and the processing unit 1310 is used to execute S501, S504, S512, S521 and S532.

[0296] When the communication device 1300 is used to implement the function of the network device in the method embodiment shown in FIG7: the transceiver unit 1320 is used to execute S502, S503, S505, S511, S513, S522, S531 and S533, and the processing unit 1310 is used to determine the first instruction information and the second instruction information.

[0297] When the communication device 1300 is used to implement the functions of the terminal in the method embodiment shown in FIG8: the transceiver unit 1320 is used to execute S502, S503, S505, S541, S543, S551 and S553, and the processing unit 1310 is used to execute S501, S504, S542 and S552.

[0298] When the communication device 1300 is used to implement the function of the network device in the method embodiment shown in FIG8: the transceiver unit 1320 is used to execute S502, S503, S505, S541, S543, S551 and S553, and the processing unit 1310 is used to determine the first instruction information and the fifth instruction information.

[0299] When the communication device 1300 is used to implement the functions of the terminal in the method embodiment shown in FIG10: the transceiver unit 1320 is used to execute S1002, S1004 and S1006, and the processing unit 1310 is used to execute S1001 and S1003.

[0300] When the communication device 1300 is used to implement the function of the network device in the method embodiment shown in FIG10: the transceiver unit 1320 is used to execute S1002, S1004 and S1006, and the processing unit 1310 is used to execute S1005.

[0301] When the communication device 1300 is used to implement the functions of the terminal in the method embodiment shown in FIG12: the transceiver unit 1320 is used to execute S1002, S1004 and S1006, and the processing unit 1310 is used to execute S10011, S10012 and S1003.

[0302] When the communication device 1300 is used to implement the function of the network device in the method embodiment shown in FIG12: the transceiver unit 1320 is used to execute S1002, S1004 and S1006, and the processing unit 1310 is used to execute S1005.

[0303] For a more detailed description of the processing unit 1310 and the transceiver unit 1320, please refer to the relevant descriptions in the method embodiments shown in Figures 5, 7, 8, 10, and 12.

[0304] As shown in Figure 14, the communication device 1400 includes a processor 1410 and an interface circuit 1420. The processor 1410 and the interface circuit 1420 are coupled to each other. It is understood that the interface circuit 1420 can be a transceiver or an input / output interface. Optionally, the communication device 1400 may also include a memory 1430 for storing instructions executed by the processor 1410, or storing input data required by the processor 1410 to execute instructions, or storing data generated after the processor 1410 executes instructions. Sometimes, the interface circuit 1420 can also be understood as part of the processor 1410, in which case the communication device 1400 includes the processor 1410.

[0305] When the communication device 1400 is used to implement the methods shown in Figures 5, 7, 8, 10, and 12, the processor 1410 is used to implement the functions of the processing unit 1310, and the interface circuit 1420 is used to implement the functions of the transceiver unit 1320.

[0306] When the aforementioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiments. The terminal chip receives information from the base station, which can be understood as the information being first received by other modules in the terminal (such as an RF module or antenna), and then sent to the terminal chip by these modules. The terminal chip sends information to the base station, which can be understood as the information being first sent to other modules in the terminal (such as an RF module or antenna), and then sent to the base station by these modules.

[0307] When the aforementioned communication device is a chip applied to a base station, the base station chip implements the functions of the base station in the above method embodiments. The base station chip receives information from the terminal, which can be understood as the information being first received by other modules in the base station (such as an RF module or antenna), and then sent to the base station chip by these modules. The base station chip sends information to the terminal, which can be understood as the information being sent down to other modules in the base station (such as an RF module or antenna), and then sent to the terminal by these modules.

[0308] In this application, entity A sends information to entity B, either directly or indirectly through other entities. Similarly, entity B receives information from entity A, either directly or indirectly through other entities. Entities A and B can be RAN nodes or terminals, or modules within RAN nodes or terminals. Information transmission and reception can be between RAN nodes and terminals, such as between a base station and a terminal; between two RAN nodes, such as between a CU and a DU; or between different modules within a single device, such as between a terminal chip and other modules of the terminal, or between a base station chip and other modules of the base station.

[0309] It is understood that the processor in the embodiments of this application can be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, field-programmable gate arrays, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0310] The method steps in the embodiments of this application can be implemented in hardware or in software instructions executable by a processor. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, optical discs, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the ASIC can reside in a base station or terminal. The processor and the storage medium can also exist as discrete components in the base station or terminal.

[0311] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both types of storage media.

[0312] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0313] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates an "or" relationship between the preceding and following related objects; in the formulas of this application, the character " / " indicates a "division" relationship between the preceding and following related objects. "Including at least one of A, B, and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B, and C.

[0314] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

Claims

1. A communication method characterized by comprising: include: The first power margin is determined based on the first maximum transmit power; Send the first power margin; Receive the first instruction message; Upon receiving the first indication information, a second power margin is determined based on the second maximum transmission power, wherein the second maximum transmission power is greater than the first maximum transmission power; Send the second power margin.

2. The method of claim 1, wherein, After sending the second power margin, the method further includes: Receive the second instruction information; Upon receiving the second indication information, a third power margin is determined based on the first maximum transmission power; Send the third power margin.

3. The method of claim 1, wherein, After sending the second power margin, the method further includes: Under the condition that the running time of the first timer reaches the first duration, the third power margin is determined according to the first maximum transmission power. The start time of the first timer is the receiving time of the first indication information or the first uplink transmission time. The first uplink transmission is the first uplink transmission after receiving the first indication information. Send the third power margin.

4. The method of claim 1, wherein, After sending the second power margin, the method further includes: Send a third instruction message; Under the condition of sending the third indication information, the third power margin is determined based on the first maximum transmission power; Send the third power margin.

5. The method according to any one of claims 2-4, characterized in that, After sending the third power margin, the method further includes: Send the fourth instruction message; Under the condition of sending the fourth indication information, the fourth power margin is determined according to the second maximum transmission power; Send the fourth power margin.

6. A communication method characterized by comprising: include: Receive a first power margin, which is determined based on a first maximum transmit power; Send a first indication message, which instructs the terminal to determine a second power margin based on a second maximum transmission power, wherein the second maximum transmission power is greater than the first maximum transmission power; Receive the second power margin.

7. The method of claim 6, wherein, After receiving the second power margin, the method further includes: Send a second instruction message, which instructs the terminal to determine a third power margin based on the first maximum transmit power; Receive the third power margin.

8. The method of claim 6, wherein, After receiving the second power margin, the method further includes: Receive a third indication information, the third indication information instructing the terminal to determine a third power margin based on the first maximum transmit power; Receive the third power margin.

9. The method according to claim 7 or 8, characterized in that, After receiving the third power margin, the method further includes: Receive a fourth indication information, the fourth indication information instructing the terminal to determine a fourth power margin based on the second maximum transmit power; Receive the fourth power margin.

10. A communications device, characterized by The communication device includes a module for performing the method as described in any one of claims 1-9.

11. A communications device, characterized by The device includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices and transmit them to the processor or to send signals from the processor to other communication devices, and the processor is used to implement the method as described in any one of claims 1-9 through logic circuits or executing code instructions.

12. A computer-readable storage medium, characterized in that, The computer readable storage medium has stored therein computer instructions, which, when executed on a communication device, cause the communication device to perform the method of any of claims 1-9.

13. A computer program product, characterised in that, comprising computer instructions, which, when executed on a communication device, cause the communication device to perform the method of any of claims 1-9.

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