WO2022001177A1 - 一种上行功率控制方法、终端及芯片 - Google Patents

一种上行功率控制方法、终端及芯片 Download PDF

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Publication number
WO2022001177A1
WO2022001177A1 PCT/CN2021/080518 CN2021080518W WO2022001177A1 WO 2022001177 A1 WO2022001177 A1 WO 2022001177A1 CN 2021080518 W CN2021080518 W CN 2021080518W WO 2022001177 A1 WO2022001177 A1 WO 2022001177A1
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WIPO (PCT)
Prior art keywords
message
uplink
mpr
terminal
pusch
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Ceased
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PCT/CN2021/080518
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English (en)
French (fr)
Inventor
陈岩
彭炳光
郭翱
杨建华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Priority to EP21834077.6A priority Critical patent/EP4156800A4/en
Publication of WO2022001177A1 publication Critical patent/WO2022001177A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present application relates to the field of communication technologies, and in particular, to an uplink power control method, a terminal, and a chip.
  • the upper limit of the transmit power of the physical uplink shared channel is related to the maximum transmit power capability of the terminal and the maximum transmit power reduction (maximun output power reduction, MPR).
  • the MPR is determined according to the waveform, modulation mode and PUSCH resource position adopted by the PUSCH.
  • the MPRs of different waveforms, modulation methods and PUSCH resource locations are pre-stored in the terminal before the terminal leaves the factory.
  • the larger the value of MPR the larger the margin of indicators such as the adjacent channel leakage ratio (ACLR) and error vector magnitude (EVM), and the higher the quality of the uplink signal sent by the terminal.
  • the value of MPR is generally set to the maximum value specified by the communication protocol.
  • the embodiments of the present application provide an uplink power control method, a terminal, and a chip, which help to improve the PUSCH transmit power in the random access process, thereby helping to reduce the possibility of random access failure of the terminal and reduce the phenomenon of network freezes .
  • an uplink power control method provided in an embodiment of the present application specifically includes:
  • the terminal receives a downlink control message from the network device, and the downlink control message is used to indicate the modulation mode and/or PUSCH resource adopted by the PUSCH; when the uplink message to be sent is not the target message, the terminal uses the first uplink transmit power sending the to-be-sent uplink message to the network device; when the to-be-sent uplink message is a target message, the terminal sends the to-be-sent uplink message to the network device with the second uplink transmit power; wherein, The target message is a message carried on the PUSCH in the random access process, the first uplink transmit power is determined according to the first MPR and the maximum transmit power capability of the terminal, and the first MPR is determined according to the The second uplink transmit power is greater than the first uplink transmit power, obtained from the modulation mode adopted by the PUSCH, the PUSCH resource, and the waveform adopted by the PUSCH.
  • the terminal uses the first uplink transmit power determined according to the first MPR and the maximum transmit power capability of the terminal.
  • the terminal sends it with the second uplink transmit power, and the second uplink transmit power is smaller than the first uplink transmit power, which helps In order to improve the PUSCH transmission power in the random access process, it is helpful to reduce the possibility of random access failure of the terminal, reduce the phenomenon of network freeze, and improve the user experience.
  • the first uplink transmit power is equal to the maximum transmit power of the terminal minus the first MPR.
  • the maximum transmit power of the terminal refers to the maximum power that can be supported by the terminal's maximum transmit power capability.
  • the second uplink transmit power is equal to the maximum transmit power of the terminal minus the second MPR, and the second MPR is smaller than the first MPR.
  • the first MPR is obtained by reducing the second MPR with a first length, and the first length is greater than 0.
  • the first length is predefined, or the first length is determined by the terminal according to the second MPR. This helps to simplify the implementation.
  • the second MPR is zero. Therefore, it is helpful to simplify the implementation manner and improve the efficiency of the terminal accessing the network.
  • the target message is the Msg3 (message3) and/or the RRC connection establishment complete message in the random access process. This helps to improve the possibility that the Msg3 or RRC connection establishment complete message is sent successfully.
  • the uplink message to be sent is not a target message
  • the uplink message to be sent is a message carried on the PUSCH after the terminal accesses the network.
  • the modulation mode adopted by the PUSCH is one of Pi/2BPSK, QPSK, 16QAM, 64QAM and/or 256QAM.
  • the waveform used by the PUSCH is one of DFT-s-OFDM or CP-OFDM.
  • the downlink control message is also used to indicate the waveform adopted by the PUSCH; or,
  • the terminal receives RRC signaling from the network device, where the RRC signaling is used to indicate the waveform adopted by the PUSCH.
  • a terminal provided by an embodiment of the present application specifically includes: a receiving module and a sending module;
  • the receiving module is configured to receive a downlink control message from a network device, where the downlink control message is used to indicate the modulation mode and/or PUSCH resource adopted by the PUSCH;
  • the sending module is configured to send the uplink message to be sent to the network device with the first uplink transmit power when the uplink message to be sent is not the target message; or, when the uplink message to be sent is the target message When , send the to-be-sent uplink message to the network device with the second uplink transmit power;
  • the target message is a message carried on the PUSCH in the random access process
  • the first uplink transmit power is determined according to the first MPR and the maximum transmit power capability of the terminal
  • the first MPR is determined according to the
  • the second uplink transmit power is greater than the first uplink transmit power, obtained from the modulation mode adopted by the PUSCH, the PUSCH resource, and the waveform adopted by the PUSCH.
  • the first uplink transmit power is equal to the maximum transmit power of the terminal minus the first MPR.
  • the second uplink transmit power is equal to the maximum transmit power of the terminal minus the second MPR, and the second MPR is smaller than the first MPR.
  • the first MPR is obtained by reducing the second MPR with a first length, and the first length is greater than 0.
  • the first length is predefined, or the first length is determined by the terminal according to the second MPR.
  • the second MPR is zero.
  • the target message is the Msg3 and/or the RRC connection establishment complete message in the random access process.
  • the uplink message to be sent is not a target message
  • the uplink message to be sent is a message carried on the PUSCH after the terminal accesses the network.
  • the modulation mode adopted by the PUSCH is one of Pi/2BPSK, QPSK, 16QAM, 64QAM and/or 256QAM.
  • the waveform used by the PUSCH is one of DFT-s-OFDM or CP-OFDM.
  • the downlink control message is also used to indicate the waveform adopted by the PUSCH; or,
  • the receiving module is further configured to receive RRC signaling from the network device, where the RRC signaling is used to indicate the waveform adopted by the PUSCH.
  • an embodiment of the present application further provides a chip, which specifically includes: a processor and a communication interface;
  • the communication interface is used to receive a downlink control message from the network device, where the downlink control message is used to indicate the modulation mode and/or PUSCH resource adopted by the PUSCH;
  • the processor is configured to control the communication interface to send the uplink message to be sent to the network device with the first uplink transmit power when the uplink message to be sent is not the target message; or, when the uplink message to be sent is not the target message When the target message is the target message, control the communication interface to send the to-be-sent uplink message to the network device with the second uplink transmit power;
  • the target message is a message carried on the PUSCH in the random access process
  • the first uplink transmit power is determined according to the first MPR and the maximum transmit power capability of the chip
  • the first MPR is determined according to the
  • the second uplink transmit power is greater than the first uplink transmit power, obtained from the modulation mode adopted by the PUSCH, the PUSCH resource, and the waveform adopted by the PUSCH.
  • the first uplink transmit power is equal to the maximum transmit power of the chip minus the first MPR.
  • the second uplink transmit power is equal to the maximum transmit power of the chip minus the second MPR, and the second MPR is smaller than the first MPR.
  • the first MPR is obtained by reducing the second MPR with a first length, and the first length is greater than 0.
  • the first length is predefined, or the first length is determined according to the second MPR.
  • the second MPR is zero.
  • the target message is the Msg3 and/or the RRC connection establishment complete message in the random access process.
  • the uplink message to be sent is not a target message
  • the uplink message to be sent is a message carried on the PUSCH after accessing the network.
  • the modulation mode adopted by the PUSCH is one of Pi/2BPSK, QPSK, 16QAM, 64QAM and/or 256QAM.
  • the waveform used by the PUSCH is one of DFT-s-OFDM or CP-OFDM.
  • the downlink control message is also used to indicate the waveform adopted by the PUSCH; or,
  • the communication interface is further configured to receive RRC signaling from the network device, where the RRC signaling is used to indicate the waveform adopted by the PUSCH.
  • an apparatus in an embodiment of the present application, where the apparatus includes a processor, and is configured to implement the above-mentioned first aspect and any possible design method of the first aspect.
  • the apparatus may also include a memory for storing the computer program.
  • the memory is coupled to the processor, and when the processor executes the computer program stored in the memory, the first aspect and any possible design method of the first aspect can be implemented.
  • the apparatus may also include a communication interface, and the communication interface is used for the apparatus to communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces, and the other devices may be network equipment or terminals, etc.
  • a fifth aspect is a computer-readable storage medium provided in an embodiment of the present application, which stores a computer program, and when the computer program is executed on a computer, enables the computer to execute the first aspect and any possibility of the first aspect. method of design.
  • a computer program product provided by an embodiment of the present application includes a computer program that, when the computer program runs on a computer, enables the computer to execute the first aspect and any possible design method of the first aspect .
  • 1 is a schematic flowchart of a method for a traditional contention-based random access procedure
  • FIG. 2 is a schematic flowchart of a method for a 2-step contention-based random access procedure
  • FIG. 3 is a schematic diagram of resource locations in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a network architecture to which an embodiment of the present application is applicable.
  • FIG. 5 is a schematic flowchart of an uplink power control method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another uplink power control method according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of the application.
  • FIG. 8 is a schematic structural diagram of another apparatus according to an embodiment of the present application.
  • the uplink synchronization between the terminal and the network device is realized through the random access (RA) process.
  • the RA process is initiated: 1), initial access from the radio resource control idle (radio resource control idle, RRC_IDLE) state, that is, the RRC connection is established; 2), radio resource control (radio resource control, RRC) connection re-establishment; 3) cell handover; 4) the synchronization status of the uplink of the terminal is uplink asynchronous.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgement
  • NACK non-acknowledge
  • 5 switch from the radio resource control inactive state (transition from RRC_INACTIVE); 6) when adding a secondary cell (secondary cell, SCell) to establish time alignment (to establish time alignment at SCell addition); 7), other service information request (request for other SI); 8), beam recovery request (beam recovery Request).
  • RA procedures are classified into contention-based RA procedures and non-contention-based RA procedures.
  • the network device allocates a dedicated random access channel (RACH) resource for the terminal to access, but when the dedicated RACH resource is insufficient, the network device will instruct the terminal to initiate a random access channel (RACH) resource.
  • RACH random access channel
  • the terminal may initiate a contention-based RA procedure according to its own needs, so as to reduce the possibility of communication failure.
  • the traditional contention-based RA process may include four steps as shown in Figure 1, which are:
  • the terminal sends Msg1 (message1, message 1) to the network device.
  • Msg1 is carried on the RACH and is used to carry a preamble sent by the terminal to the network device.
  • the preamble is randomly selected by the terminal.
  • the preamble is sent on a physical random access channel (PRACH) resource indicated by a random access radio network temporary identifier (RA-RNTI).
  • PRACH physical random access channel
  • RA-RNTI random access radio network temporary identifier
  • the network device receives the Msg1 from the terminal, and returns the Msg2 to the terminal.
  • Msg2 can be understood as the response to Msg1 sent by the network device to the terminal, that is, the random access response (RAR), which is carried on the physical downlink shared channel (PDSCH), which can include temporary cell wireless networks.
  • RAR random access response
  • PDSCH physical downlink shared channel
  • Temporary cell radio network temporary identifier temporary C-RNTI
  • the uplink resources allocated for Msg3 are physical uplink shared channel (physical uplink shared channel, PUSCH) resources.
  • the terminal receives the Msg2 from the network device, and sends the Msg3 to the terminal.
  • Msg3 is carried on the PUSCH, and is used by the terminal to request the network device to establish a radio resource control (radio resource control, RRC) connection.
  • RRC radio resource control
  • the network device receives the Msg3 from the terminal, and returns the Msg4 to the terminal.
  • Msg4 is carried on the PDSCH and is used by the base station to notify the terminal that the random access competition is successful.
  • the terminal sends the MsgA to the network device.
  • MsgA includes the functions of Msg1 and Msg3 in the traditional competition-based SA process.
  • the network device receives the MsgA from the terminal, and sends the MsgB to the terminal.
  • MsgB includes the functions of Msg2 and Msg4 in the traditional competition-based SA process.
  • Msg1, Msg2, Msg3 and Msg4 can refer to the related introduction in FIG. 1 . It can be understood that although Msg1 and Msg3 are sent in parallel, Msg1 is carried on the RACH and Msg3 is carried on the PUSCH.
  • the terminal receives Msg4 or MsgB from the network device, and also sends a radio resource control (radio resource control, RRC) connection setup complete (RRC setup complete) message to the network device.
  • RRC radio resource control
  • the RRC establishment complete message is carried on the PUSCH, and is used by the terminal to notify the base station that the random access procedure is completed.
  • the uplink transmit power of the PUSCH can be understood as the transmit power used by the message carried on the PUSCH, which is limited by the upper limit of the transmit power of the PUSCH.
  • the upper limit of the PUSCH transmit power is related to the terminal's maximum transmit power capability and power backoff.
  • the upper limit of the PUSCH transmit power satisfies the following expression:
  • P cmax_H,f,c min ⁇ P EMAX,c ,P powerClass - ⁇ P powerClass ⁇
  • P cmax, f, c is the upper limit of PUSCH transmit power
  • P cmax_L, f, c is the minimum limit of PUSCH transmit power
  • P cmax_H, f, c is the maximum limit of PUSCH transmit power
  • P EMAX, c is the maximum transmit power indicated by the network device to the terminal through RRC signaling
  • ⁇ T C,c is a constant
  • P powerClass is the maximum transmit power capability of the terminal
  • ⁇ P powerClass is a constant
  • MPR c is the maximum transmit power fallback value
  • A- MPR c is the extra power back-off value
  • ⁇ T IB,c is the extra power offset
  • ⁇ T RxSRS,c is a constant
  • P-MPR c is the maximum power back-off value when the human body absorbs the electromagnetic radiation standard of the terminal.
  • P cmax is the upper limit of PUSCH transmit power
  • P max is the maximum transmit power capability of the terminal
  • MPR is the maximum transmit power fallback value
  • P-MPR is the maximum transmit power fallback value when the human body absorbs the terminal's electromagnetic radiation amount standard.
  • the amount of electromagnetic radiation absorbed by the human body can be measured by the specific absorption rate (SAR).
  • SAR refers to the amount of electromagnetic radiation absorbed per kilogram of human tissue in 6 minutes. Generally speaking, the larger the SAR, the greater the amount of electromagnetic radiation that people absorb from the terminal.
  • the Federal Communications Commission (FCC) stipulates that the electromagnetic radiation level of the human body to absorb the terminal is SAR less than 1.6 watts/kg.
  • the standard of electromagnetic radiation for human absorption terminals adopted in Europe and China is that the SAR is not higher than 2 W/kg.
  • the P-MPR is determined by the terminal according to the distance between the mobile phone and the human body and the standard of electromagnetic radiation absorbed by the human body from the terminal.
  • Expression 1 can be further simplified to Expression 2:
  • the MPR is determined according to the waveform adopted by the PUSCH, the modulation method and the position of the PUSCH resource.
  • the waveform, modulation mode and PUSCH resource location used by the PUSCH are indicated to the terminal by the network device.
  • the MPRs of different waveforms, modulation modes and PUSCH resource locations are pre-stored in the terminal before the terminal leaves the factory.
  • MPR will not exceed the provisions of the communication protocol.
  • the MPR provisions in the NR protocol can be found in Table 1:
  • the maximum value of MPR shall not exceed 1.5dB.
  • the maximum transmit power capability of the terminal is 23dB
  • the modulation method is QPSK
  • the PUSCH resource scheduled by the network device for the terminal is Inner RB
  • the terminal backs off at most 1.5dB, That is, the upper limit of the PUSCH transmit power of the terminal can reach 21.5dB.
  • edge resource block refers to the RB located on the frequency band boundary used for NR communication
  • outer resource block is located in the inner resource block ( between inner resource block, Inner RB) and Edge RB.
  • the bandwidth of the frequency band used for NR communication as 20M as an example, as shown in FIG.
  • FIG. 3 is a schematic diagram of a frequency band used for NR communication, the RB located between the frequency f1 and the frequency f2 or between the frequency f5 and the frequency f6 is Edge RB, the RB between frequency f2 and frequency f3 or between frequency f4 and frequency f5 is Outer RB, and the RB between frequency f3 and frequency f4 is Inner RB.
  • the MPR stored in the terminal is the maximum value specified by the communication protocol. Taking Table 1 as an example, for Outer RB, QPSK and CP-OFDM, the maximum value of MPR is 1.5dB. Therefore, for Outer RB, QPSK and CP-OFDM, the MPR stored in the terminal is 1.5dB.
  • the margin of ACLR refers to the difference between the ACLR when the terminal determines the upper limit of the PUSCH transmit power and uses a certain MPR and the ACLR when the uplink transmit performance requirements are met exactly. . Therefore, when the terminal determines that the MPR used by the upper limit of the PUSCH transmission power is the maximum value of the communication protocol, the margin of the ACLR is the largest.
  • the uplink transmission performance requirements can be defined by a communication protocol.
  • the margin of other indicators such as EVM is similar to that of ACLR, and will not be introduced one by one here. It can be understood that the MPR stored in the terminal for different waveforms, modulation methods and resources at different locations can also be a value that does not exceed the value specified in the communication protocol when indicators such as ACLR and EVM meet the uplink transmission performance requirements.
  • the maximum value of MPR is 1.5dB. Therefore, for Outer RB, QPSK and CP-OFDM, the MPR stored in the terminal can be less than 1.5 dB, for example, for Outer RB, QPSK and CP-OFDM, the MPR stored at the terminal is 1.3dB. In this case, if the maximum transmit power capability of the terminal is 23dB, the maximum value of the PUSCH transmit power of the terminal is 21.7dB.
  • the MPR is large, it is easy to limit the size of the upper limit of the PUSCH transmit power, which will lead to random access failure and network freezes.
  • the stored MPR for Inner RB, QPSK and CP-OFDM is 1.5dB.
  • the modulation method is QPSK
  • the waveform is CP-OFDM
  • the MPR determined by the terminal is 1.5dB.
  • the terminal uses 1.5dB for power back-off later, although the margin of ACLR, EVM and other indicators reaches the maximum, but it limits the size of the upper limit of the PUSCH transmission power, resulting in the failure of Msg3 transmission and the random access of the terminal. Fail.
  • the embodiments of the present application provide an uplink power control method, by reducing the size of the MPR in the random access process of the terminal, and increasing the upper limit of the PUSCH transmission power in the random access process, although ACLR, EVM, etc. are reduced.
  • the margin of the indicator but it helps to improve the probability of successful random access, reduces the number of network freezes, and helps to improve user experience.
  • the margin of indicators such as ACLR and EVM is maintained, and the signal quality is high.
  • At least one refers to one or more, and "a plurality” refers to two or more.
  • And/or which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects are an “or” relationship.
  • At least one (item) of the following or its similar expression refers to any combination of these items, including any combination of single item (item) or plural item (item).
  • At least one (a) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.
  • first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.
  • first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information without departing from the scope of the present application.
  • word "if” as used herein can be interpreted as "at the time of” or "when” or "in response to determining.”
  • FIG. 4 shows an architecture diagram of a communication system to which the embodiments of the present application are applied.
  • the communication system of the embodiment of the present application includes a network device and a terminal.
  • the communication mode between the terminal and the network device is wireless communication.
  • the terminal in this embodiment of the present application is a device with a wireless transceiver function, which may be referred to as a terminal equipment (terminal equipment), a user equipment (UE), a mobile station (mobile station, MS), and a mobile terminal (mobile terminal).
  • terminal, MT access terminal equipment, in-vehicle terminal equipment, industrial control terminal equipment, UE unit, UE station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, wireless communication equipment, UE proxy or UE device etc.
  • the location of the terminal can be fixed or mobile. It should be noted that the terminal can support at least one wireless communication technology, such as long term evolution (long term evolution, LTE), NR, wideband code division multiple access (wideband code division multiple access, WCDMA) and the like.
  • LTE long term evolution
  • NR wideband code division multiple access
  • WCDMA wideband code division multiple access
  • the terminal may be a mobile phone (mobile phone), a tablet computer (pad), a desktop computer, a notebook computer, an all-in-one computer, a vehicle-mounted terminal, a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial Wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, transportation safety ), wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop Wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, mobile devices in future mobile communication networks
  • the terminal in this embodiment of the present application may also be a device having a transceiver function, such as a chip system.
  • the chip system may include chips, and may also
  • the network device in the embodiment of the present application is a device that provides a wireless access function for a terminal, and may also be referred to as an access network device, a radio access network (radio access network, RAN) device, or the like.
  • the network device may support at least one wireless communication technology, such as LTE, NR, WCDMA, and the like.
  • the network equipment includes, but is not limited to: a next-generation base station (generation nodeB, gNB), an evolved node B (evolved node B, eNB), a wireless network control system in a fifth-generation mobile communication system (5th-generation, 5G) radio network controller (RNC), node B (node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved node B, Or home node B, HNB), baseband unit (baseband unit, BBU), transmitting and receiving point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, small station, micro station, etc.
  • RNC radio network controller
  • node B node B
  • BSC base station controller
  • BTS base transceiver station
  • home base station for example, home evolved node B, Or home node B, HNB
  • baseband unit baseband unit
  • TRP transmitting and
  • the network device may also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (CRAN) scenario, or the network device may It is a relay station, an access point, a vehicle-mounted device, a terminal device, a wearable device, and a network device in the future mobile communication or a network device in the future evolved PLMN.
  • the network device may also be an apparatus having a function of providing wireless communication for the terminal, such as a chip system.
  • the system-on-chip may include chips, and may also include other discrete devices.
  • the communication system shown in FIG. 4 is only an exemplary illustration, and does not constitute a limitation on the communication system of the embodiment of the present application.
  • the embodiments of the present application do not limit the number of network devices and the number of terminals in the communication system.
  • multi-point coordinated communication may be performed between the network devices and the network devices.
  • the communication system includes multiple macro base stations and multiple micro base stations, wherein the macro base station and the macro base station, the micro base station and the micro base station, and the macro base station and the micro base station can perform multi-point coordinated communication.
  • the uplink power control method according to the embodiment of the present application will be introduced below with reference to the communication system shown in FIG. 4 .
  • FIG. 5 it is an uplink power control method according to an embodiment of the present application, which specifically includes the following steps.
  • the terminal sends a random access request to a network device.
  • the random access request is used to initiate a contention-based random access procedure.
  • the terminal may send a random access request to the network device after receiving the first indication information of the network device.
  • the first indication information is used to instruct the terminal to initiate a contention-based random access procedure.
  • the terminal may also send a random access request to the network device during initial access.
  • the terminal may trigger initial access when the terminal is powered on or off the airplane mode.
  • the terminal may also send a random access request to the network device during cell handover.
  • the terminal sends a random access request to the network device when the uplink is out of synchronization, or when the RRC connection is reestablished, or when the transition from RRC_INACTIVE occurs.
  • the terminal may also be triggered to send a random access request to the network device in other ways.
  • the network device After receiving the random access request from the terminal, the network device sends an RAR to the terminal.
  • the RAR is used to indicate the modulation mode and/or PUSCH resource of the PUSCH.
  • the RAR includes PUSCH modulation information and PUSCH resource information, where the modulation information of the PUSCH is used to indicate the modulation mode of the PUSCH, and the PUSCH resource information is used to indicate the position and size of the PUSCH resource.
  • the network device may not need to indicate the waveform used by the terminal PUSCH.
  • the waveform supported in LTE is DTF-s-OFDM.
  • the network device does not need to indicate the waveform used by PUSCH to the terminal, and the terminal can default the waveform used by PUSCH to DFT-s-OFDM.
  • RAR may also be used to indicate the waveform adopted by PUSCH.
  • the RAR may also include PUSCH waveform indication information.
  • the waveform adopted by the PUSCH may be indicated to the terminal by the network device through RRC signaling. This is not limited.
  • the network device may allocate PUSCH resources to the terminal and determine the PUSCH modulation method according to the path loss and interference level between the terminal and the network device. Further, when the modulation information of PUSCH also indicates the waveform used by PUSCH, the network device can also determine the waveform used by PUSCH from all supported waveforms according to the path loss and interference level between the terminal and the network device. It should be noted that the above is only an example of allocating PUSCH resources and determining the PUSCH modulation mode and waveform. Allocating PUSCH resources and determining the PUSCH modulation mode and waveform are a specific implementation inside the network device, and the embodiments of the present application do not. Do limit.
  • the terminal After receiving the RAR sent from the network device, the terminal determines the first MPR according to the PUSCH resource, the modulation mode adopted by the PUSCH, and the waveform adopted by the PUSCH.
  • the first MPR is an MPR that is pre-stored in the terminal and corresponds to the modulation mode used by the PUSCH, the waveform used by the PUSCH, and the PUSCH resource.
  • the modulation mode is QPSK
  • the PUSCH resource is Inner RB
  • the MPR must not exceed 1.5dB at the maximum, so in this case, the MPR stored by the terminal for CP-OFDM, QPSK and Inner RB must not exceed 1.5dB. If the MPR stored by the terminal's true poison CP-OFDM, QPSK and Inner RB is 1dB, then the first MPR is 1dB.
  • the terminal reduces the first MPR by the first length to obtain the second MPR.
  • the first step length may be a fixed value, which may be predefined by a protocol.
  • different first step lengths can be set for different waveforms, modulation methods and resources through communication protocols.
  • the first step length for different waveforms, modulation methods and resource settings can be as shown in Table 2.
  • the terminal reduces the first MPR by N G1 to obtain the second MPR. It should be noted that, when the first MPR is less than N G1 , the terminal reduces the first MPR by N G1 , and the obtained second MPR is 0.
  • the first step length may be measured when the ACLR, EVM and other indicators meet the uplink transmission performance requirements and the margin of the ACLR, EVM and other indicators is the smallest, so as to avoid poor signal quality.
  • a first step length range may also be predefined through a protocol, and the terminal determines the actually used first step length according to its own needs.
  • the first length may also be indicated to the terminal by the network device.
  • the network device may indicate the first step length to the terminal through the RAR.
  • the terminal may first determine whether the first MPR is greater than the first length, and if the first MPR is greater than the first length, the terminal reduces the first MPR by the first length to obtain the second MPR. In other embodiments, if the first MPR is less than or equal to the first length, the terminal reduces the first MPR to 0, that is, the second MPR is 0. Thereby helping to avoid overflow.
  • the first step length may also be determined by the terminal according to a certain algorithm or strategy. For example, when the ACLR, EVM and other indicators meet the uplink transmission performance requirements, the terminal reduces the margin of the ACLR, EVM and other indicators to 0 or a value less than the maximum margin when the first MPR needs to be reduced as the first step. long.
  • the first step length is equal to the first MPR. In this case, the value of the second MPR is 0.
  • the strategy for the terminal to determine the first step length is as follows: the first step length is equal to the product of the first MPR and a weight coefficient. For example, if the weight coefficient is 0.5, the second MPR is half of the first MPR.
  • the weight coefficient may be predefined by a protocol, or may be indicated to the terminal by the network device.
  • the above is only described by taking the weight coefficient as 0.5 as an example, and the size of the weight coefficient is not limited in the embodiments of the present application. It can be understood that the weight coefficient here is a value greater than 0 and less than or equal to 1.
  • the weight coefficient may be determined according to the margin of indicators such as ACLR and EVM. It should be noted that, in the embodiment of the present application, the weight coefficient may also be determined in other manners, which is not limited.
  • the terminal determines, according to the maximum transmission power capability of the terminal and the second MPR, the upper limit of the PUSCH transmission power used to carry the MSG3 as the first upper limit of the transmission power.
  • the terminal uses the first uplink transmit power to send Msg3 to the network device.
  • the first uplink transmit power is determined according to the first transmit power upper limit.
  • the first uplink transmit power satisfies Expression 3:
  • ⁇ is the influence of the transmission bandwidth on the transmit power factor, is the transmission bandwidth
  • ⁇ b,f,c (j) is the path loss conversion factor
  • PL b,f,c (q d ) is the downlink path loss between the terminal and the network equipment
  • ⁇ TF,b,f,c ( i) is the influence amount of the code rate on the transmit power
  • f b, f, c (i, l) is the power adjustment amount indicated by the network device through the transmit power control (transmit power control, TPC) command.
  • P cmax,f,c (i) is determined according to the second MPR and the maximum transmit power capability of the terminal, for example, P cmax,f,c (i) satisfies Expression 4:
  • P max is the maximum transmit power capability of the terminal
  • MPR is the second MPR.
  • the upper limit of the PUSCH transmission power used to carry Msg3 is determined according to the maximum transmission capability of the terminal and the second MPR, and the second MPR is smaller than the first MPR, the upper limit of the PUSCH transmission power used to carry Msg3 is determined according to the first MPR. Compared with the above, it helps to increase the possibility of the upper limit of PUSCH transmit power, thereby helping to increase the uplink transmit power of Msg3, further helping to improve the possibility of successful access to the network through the contention-based random access process, reducing the network The number of freezes is improved to improve user experience.
  • the network device receives the Msg3 from the terminal, and sends the Msg4 to the terminal.
  • the terminal receives the Msg4 from the network device, firstly, according to the PUSCH resource used to carry the RRC connection establishment complete message, the adopted waveform and the modulation mode, determine the third MPR. . Secondly, the terminal reduces the third MPR by the second step to obtain the fourth MPR, and determines the upper limit of the PUSCH transmission power for carrying the RRC connection establishment complete message according to the fourth MPR and the maximum transmission power capability of the terminal. Then, the second transmission power is determined according to the upper limit of the PUSCH transmission power used to carry the RRC connection establishment complete message, and the RRC connection establishment complete message is sent to the network device with the second transmission power. The RRC connection establishment complete message is carried on the PUSCH and sent.
  • waveforms, modulation methods used in the RRC connection establishment complete message and the resource location used to carry the RRC connection complete message may be indicated to the terminal by the network device through Msg4 or Msg2 or other control information, Alternatively, sections can also be predefined.
  • the second step size used by the terminal to send the RRC connection establishment complete message may be the same as or different from the first step size used by the terminal to send Msg3.
  • the first step size used by the terminal to send Msg3. please refer to the introduction of the first step size when sending Msg3. Repeat.
  • the terminal After receiving the RAR, the terminal determines, according to the maximum transmit power capability of the terminal and the second MPR, that the upper limit of the PUSCH transmit power used to carry MSG3 is the first uplink transmit power upper limit.
  • the value of the second MPR is a fixed value, and is smaller than the first MPR, for example, 0. Therefore, it is not necessary to determine the first MPR, the computation amount is reduced, and the efficiency of random access is improved.
  • the terminal may also determine that the upper limit of the PUSCH transmit power is the first value according to the terminal's maximum transmit power capability and the second MPR.
  • the value of the second MPR is a fixed value and is smaller than the first MPR.
  • the upper limit of the uplink transmit power used by the terminal to send the uplink message is based on the maximum transmit power of the terminal.
  • the fifth MPR is the MPR stored in the terminal that corresponds to the waveform used by the uplink message, the modulation mode, and the location of the resource bearing the uplink message. That is, after the terminal accesses the network, there is no need to reduce the MPR.
  • the MPR stored by the terminal for Outer RB, QPSK and DFT-OFDM is 1dB, that is, the first MPR is 1dB, and the MPR stored by the terminal for Outer RB, QPSK and DFT-OFDM is 1dB.
  • the second MPR for RB, QPSK and DFT-OFDM is 0.5dB.
  • the upper limit of the PUSCH transmit power used to carry the Msg3 or RRC connection establishment complete message is 22.5dB, and when the terminal accesses the network After that, the upper limit of the PUSCH transmit power used to carry the uplink message is 22dB.
  • uplink power control method shown in FIG. 5 can also be applied to the contention-based random access procedure shown in FIG. 2 .
  • an embodiment of the present application provides an uplink power control method, as shown in FIG. 6 , which specifically includes the following steps:
  • the network device sends a downlink control message to the terminal, where the downlink control message is used to indicate the modulation mode and/or PUSCH resource adopted by the PUSCH. Further, in some embodiments, the downlink control information is also used to indicate the waveform adopted by the PUSCH. Alternatively, the waveform adopted by the PUSCH is indicated to the terminal by the network device through RRC signaling. Alternatively, the waveform used by the PUSCH is predefined by a protocol, etc., which is not limited.
  • the downlink control message in this embodiment of the present application may be downlink control information (downlink control information, DCI) in format 0_0 or 0_1.
  • DCI format 0_0 it can be determined by cell-radio network temporary identifier (C-RNTI) or configured scheduling radio network temporary identifier (CS-RNTI) or MCS- C-RNTI scrambling.
  • C-RNTI cell-radio network temporary identifier
  • CS-RNTI configured scheduling radio network temporary identifier
  • MCS- C- C-RNTI MCS- C-RNTI scrambling.
  • the frequency domain resource assignment (frequency domain resource assignment) is used to indicate the PUSCH resources
  • the modulation and coding strategy modulation and code scheme, MCS
  • MCS modulation and code scheme
  • the terminal receives the downlink control message from the network device, and generates an uplink message to be sent according to the modulation mode, waveform and PUSCH resource adopted by the PUSCH.
  • the terminal sends the uplink message to be sent to the network device with the first uplink transmit power.
  • the first uplink transmit power is the maximum transmit power of the terminal minus the first MPR
  • the first MPR is the MPR stored in the terminal and corresponding to the waveform and modulation mode used by the PUSCH and the PUSCH resource.
  • the terminal determines the upper limit of the PUSCH transmission power according to the first MPR. Then, the terminal determines the upper limit of the PUSCH transmission power according to the first MPR to determine the first uplink transmission power, and then sends the to-be-sent uplink message to the network device with the first uplink transmission power.
  • the target message is the message carried on the PUSCH in the contention-based SA process, such as Msg3, and the RRC connection establishment complete message.
  • the terminal sends the to-be-sent uplink message with the second uplink transmit power.
  • the second uplink transmit power is greater than the first uplink transmit power.
  • the second uplink transmit power is the maximum transmit power of the terminal minus the second MPR, and the second MPR is smaller than the first MPR.
  • the terminal determines the upper limit of the PUSCH transmission power according to the second MPR. Then, the terminal determines the upper limit of the PUSCH transmission power according to the second MPR to determine the second uplink transmission power, and then sends the to-be-sent uplink message to the network device with the second uplink transmission power.
  • the second MPR is smaller than the first MPR, and may be obtained by reducing the first MPR by the first length, or may be a fixed value, such as 0.
  • the first MPR is the MPR that is stored in the terminal and corresponds to the waveform and modulation mode used by the PUSCH and the location of the PUSCH resource.
  • determining the upper limit of the PUSCH transmission power according to the second MPR helps to increase the possibility of increasing the upper limit of the terminal transmission power, thereby helping to improve the uplink transmission power in the RA process, This further helps to improve the possibility of successful network access through the RA process, reduces the number of network freezes, and improves user experience.
  • the communication methods provided by the embodiments of the present application are introduced from the perspective of a terminal as an execution subject.
  • the terminal may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is performed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • an embodiment of the present application further provides an apparatus 700 , where the apparatus 700 includes a receiving module 701 and a sending module 702 .
  • the receiving module 701 is configured to receive the downlink control message from the network device, and the sending module 702 is configured to send the to-be-sent uplink message to the network device with the first uplink transmit power when the to-be-sent uplink message is the target message; When the sent uplink message is not the target message, the to-be-sent uplink message is sent to the network device with the second uplink transmit power.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
  • an embodiment of the present application further provides an apparatus 800 .
  • the apparatus 800 is used to implement the function of the terminal in the above method, and the apparatus may be a terminal, or may be a chip or a chip system in the terminal.
  • the apparatus 800 includes at least one processor 801 for implementing the functions of the terminal in the above method.
  • the processor 801 may be configured to send the uplink message to be sent to the network device with the first uplink transmit power when the uplink message to be sent is the target message; when the uplink message to be sent is not the target message, send the uplink message to the network device with the first uplink transmit power
  • the second uplink transmit power sends the to-be-sent uplink message to the network device.
  • apparatus 800 may also include at least one memory 802 for storing program computer programs.
  • Memory 802 is coupled to processor 801 .
  • the coupling in the embodiments of the present application is the spaced coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between the devices, units or modules.
  • memory 802 may also be located external to apparatus 800 .
  • the processor 801 may cooperate with the memory 802 .
  • the processor 801 may execute computer programs stored in the memory 802 . At least one of the at least one memory may be included in the processor.
  • the apparatus 800 may further include a communication interface 803 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 800 may communicate with other devices.
  • the communication interface 803 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be other terminal or network device.
  • the processor 801 uses the communication interface 803 to send and receive messages, and is used to implement the methods in the above embodiments.
  • the communication interface 803 may be used to receive downlink control messages from network devices.
  • the embodiment of the present application does not limit the connection medium between the communication interface 803 , the processor 801 , and the memory 802 .
  • the memory 802 , the processor 801 , and the communication interface 803 may be connected by a bus, and the bus may be divided into an address bus, a data bus, a control bus, and the like.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can implement or
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or may also be a volatile memory (volatile memory), for example Random-access memory (RAM).
  • Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and/or data.
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented in software, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable apparatus.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server or data center by wire (eg coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available mediums integrated.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, digital video discs (DVD)), or semiconductor media (eg, SSDs), and the like.

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Abstract

一种上行功率控制方法、终端及芯片，涉及通信技术领域。其方法包括：终端接收来自网络设备的用于指示PUSCH采用的调制方式和/或PUSCH资源的下行控制消息。当待发送的上行消息不为目标消息时，终端以第一上行发射功率发送待发送的上行消息；当待发送的上行消息为目标消息时，终端以第二上行发射功率发送待发送的上行消息；目标消息为随机接入过程中承载在PUSCH上的消息，第一上行发射功率是根据第一MPR确定的，第二上行发射功率大于第一上行发射功率，第一MPR是根据PUSCH采用的调制方式、波形和PUSCH资源得到的。这种技术方案有助于提高随机接入过程中PUSCH发射功率，从而有助于降低终端随机接入失败的可能性。

Description

一种上行功率控制方法、终端及芯片
相关申请的交叉引用
本申请要求在2020年06月30日提交中国专利局、申请号为202010617617.3、申请名称为“一种上行功率控制方法及终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别涉及一种上行功率控制方法、终端及芯片。
背景技术
目前，物理上行共享信道(physical uplink shared channel，PUSCH)发射功率的上限与终端的最大发射功率能力和最大发射功率回退(maximun output power reduction，MPR)有关。其中，MPR是根据PUSCH采用的波形、调制方式和PUSCH资源位置确定的。不同的波形、调制方式和PUSCH资源位置的MPR是终端出厂之前预先存储在终端的。通常，MPR取值越大，相邻信道泄漏比(adjacent channel leakage ratio，ACLR)和误差向量幅度(error vector magnitude，EVM)等指标的余量越大，终端发送的上行信号质量也就越高，因此，现有技术中，一般将MPR的取值设置为通信协议规定的最大值。然而，在采用基于竞争随机接入过程实现终端与基站之间上行同步的情况下，如果MPR较大，则容易限制PUSCH发射功率上限的大小，从而导致随机接入失败，造成网络卡顿等现象。
发明内容
本申请实施例提供了一种上行功率控制方法、终端及芯片，有助于提高随机接入过程中PUSCH发射功率，从而有助于降低终端随机接入失败的可能性，减少网络卡顿的现象。
第一方面，为本申请实施例提供的一种上行功率控制方法，具体包括：
终端接收来自网络设备的下行控制消息，所述下行控制消息用于指示PUSCH采用的调制方式和/或PUSCH资源；当待发送的上行消息不为目标消息时，所述终端以第一上行发射功率向所述网络设备发送所述待发送的上行消息；当待发送的上行消息为目标消息时，所述终端以第二上行发射功率向所述网络设备发送所述待发送的上行消息；其中，所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一MPR和所述终端的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
本申请实施例中，由于终端在待发送的上行消息不为随机接入过程中承载在PUSCH上的消息的情况下，以根据第一MPR和终端的最大发射功率能力确定的第一上行发射功率发送，而终端在待发送的上行消息为随机接入过程中承载在PUSCH上的消息的情况下，以第二上行发射功率发送，而第二上行发射功率小于第一上行发射功率，从而有助于提高随机接入过程中PUSCH发射功率，有助于降低终端随机接入失败的可能性，减少网络卡 顿的现象，提高用户体验。
在一种可能的设计中，所述第一上行发射功率等于所述终端的最大发射功率减去所述第一MPR。其中，所述终端的最大发射功率指的是所述终端的最大发射功率能力所能支撑的最大功率。
在一种可能的设计中，所述第二上行发射功率等于所述终端的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
在一种可能的设计中，所述第一MPR为以第一步长降低所述第二MPR得到的，所述第一步长大于0。
在一种可能的设计中，所述第一步长为预定义的，或者所述第一步长是所述终端根据所述第二MPR确定的。从而有助于简化实现方式。
在一种可能的设计中，所述第二MPR为0。从而有助于简化实现方式，提高终端接入网络的效率。
在一种可能的设计中，所述目标消息为随机接入过程中的Msg3(message3)和/或RRC连接建立完成消息。从而有助于提高Msg3或者RRC连接建立完成消息发送成功的可能性。
在一种可能的设计中，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为所述终端接入网络后承载在PUSCH上的消息。
在一种可能的设计中，所述PUSCH采用的调制方式为Pi/2BPSK、QPSK、16QAM、64QAM和/或256QAM中的一种。
在一种可能的设计中，所述PUSCH采用的波形为DFT-s-OFDM或CP-OFDM中的一种。
在一种可能的设计中，所述下行控制消息还用于指示所述PUSCH采用的波形；或者，
所述终端接收来自所述网络设备的RRC信令，所述RRC信令用于指示所述PUSCH采用的波形。
第二方面，为本申请实施例提供的一种终端，具体包括：接收模块和发送模块；
所述接收模块，用于接收来自网络设备的下行控制消息，所述下行控制消息用于指示PUSCH采用的调制方式和/或PUSCH资源；
所述发送模块，用于当待发送的上行消息不为目标消息时，以第一上行发射功率向所述网络设备发送所述待发送的上行消息；或者，当待发送的上行消息为目标消息时，以第二上行发射功率向所述网络设备发送所述待发送的上行消息；
所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一MPR和所述终端的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
在一种可能的设计中，所述第一上行发射功率等于所述终端的最大发射功率减去所述第一MPR。
在一种可能的设计中，所述第二上行发射功率等于所述终端的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
在一种可能的设计中，所述第一MPR为以第一步长降低所述第二MPR得到的，所述第一步长大于0。
在一种可能的设计中，所述第一步长为预定义的，或者所述第一步长是所述终端根据 所述第二MPR确定的。
在一种可能的设计中，所述第二MPR为0。
在一种可能的设计中，所述目标消息为随机接入过程中的Msg3和/或RRC连接建立完成消息。
在一种可能的设计中，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为所述终端接入网络后承载在PUSCH上的消息。
在一种可能的设计中，所述PUSCH采用的调制方式为Pi/2BPSK、QPSK、16QAM、64QAM和/或256QAM中的一种。
在一种可能的设计中，所述PUSCH采用的波形为DFT-s-OFDM或CP-OFDM中的一种。
在一种可能的设计中，所述下行控制消息还用于指示所述PUSCH采用的波形；或者，
所述接收模块还用于接收来自所述网络设备的RRC信令，所述RRC信令用于指示所述PUSCH采用的波形。
第三方面，本申请实施例还提供了一种芯片，具体包括：处理器和通信接口；
所述通信接口用于接收来自网络设备的下行控制消息，所述下行控制消息用于指示PUSCH采用的调制方式和/或PUSCH资源；
所述处理器用于当待发送的上行消息不为目标消息时，控制所述通信接口以第一上行发射功率向所述网络设备发送所述待发送的上行消息；或者，当待发送的上行消息为目标消息时，控制所述通信接口以第二上行发射功率向所述网络设备发送所述待发送的上行消息；
所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一MPR和所述芯片的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
在一种可能的设计中，所述第一上行发射功率等于所述芯片的最大发射功率减去所述第一MPR。
在一种可能的设计中，所述第二上行发射功率等于所述芯片的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
在一种可能的设计中，所述第一MPR为以第一步长降低所述第二MPR得到的，所述第一步长大于0。
在一种可能的设计中，所述第一步长为预定义的，或者所述第一步长是根据所述第二MPR确定的。
在一种可能的设计中，所述第二MPR为0。
在一种可能的设计中，所述目标消息为随机接入过程中的Msg3和/或RRC连接建立完成消息。
在一种可能的设计中，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为接入网络后承载在PUSCH上的消息。
在一种可能的设计中，所述PUSCH采用的调制方式为Pi/2BPSK、QPSK、16QAM、64QAM和/或256QAM中的一种。
在一种可能的设计中，所述PUSCH采用的波形为DFT-s-OFDM或CP-OFDM中的一种。
在一种可能的设计中，所述下行控制消息还用于指示所述PUSCH采用的波形；或者，
所述通信接口还用于接收来自所述网络设备的RRC信令，所述RRC信令用于指示所述PUSCH采用的波形。
第四方面，为本申请实施例提供的一种装置，所述装置包括处理器，用于实现上述第一方面以及第一方面任一种可能的设计的方法。所述装置还可以包括存储器，用于存储计算机程序。所述存储器与所述处理器耦合，所述处理器执行所述存储器中存储的计算机程序时，可以实现上述第一方面以及第一方面任一种可能的设计的方法。所述装置还可以包括通信接口，所述通信接口用于该装置与其它设备进行通信，示例性的，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口，其它设备可以为网络设备或终端等。
第五方面，为本申请实施例提供的一种计算机可读存储介质，存储有计算机程序，当所述计算机程序在计算机上执行时，使得计算机执行第一方面以及第一方面任一种可能的设计的方法。
第六方面，为本申请实施例提供的一种计算机程序产品，包括计算机程序，当所述计算机程序在计算机上运行时，使得计算机执行第一方面以及第一方面任一种可能的设计的方法。
另外，第二方面至第六方面中任一种可能设计方式所带来的技术效果可参见方法部分中不同设计方式所带来的技术效果，此处不再赘述。
附图说明
图1为传统的基于竞争的随机接入过程的方法的流程示意图；
图2为2-step基于竞争的随机接入过程的方法的流程示意图；
图3为本申请实施例中资源位置的示意图；
图4为本申请实施例适用的一种网络架构示意图；
图5为本申请实施例的一种上行功率控制方法的流程示意图；
图6为本申请实施例的另一上行功率控制方法的流程示意图；
图7为本申请实施例的一种装置的结构示意图；
图8为本申请实施例的另一装置的结构示意图。
具体实施方式
无线通信中是通过随机接入(random access，RA)过程实现终端与网络设备之间的上行同步的。通常，当终端处于以下场景时，发起RA过程：1)、从无线资源控制空闲(radio resource control idle，RRC_IDLE)状态初始接入，即RRC连接建立；2)、无线资源控制(radio resource control，RRC)连接重建；3)小区切换(handover)；4)终端的上行链路的同步状态为上行不同步。例如，终端在下行数据到达时，需要回应(混合自动重传请求(hybrid automatic repeat request，HARQ)信息(如确认(acknowledge，ACK)、或否认(non-acknowledge，NACK))而上行不同步；或者，上行数据到达时，上行不同步。5)、从无线资源控制未激活状态切换(transition from RRC_INACTIVE)；6)在添加辅小区 (secondary cell，SCell)时建立时间对齐(to establish time alignment at SCell addition)；7)、其他服务信息请求(request for other SI)；8)、波束恢复请求(beam recovery Request)。
一般来说，RA过程分为基于竞争的RA过程和基于非竞争的RA过程。其中，在基于非竞争的RA过程中，网络设备为终端分配专用的随机接入信道(random access channel，RACH)资源进行接入，但当专用的RACH资源不足时，网络设备会指示终端发起基于竞争的RA过程。或者，终端可以根据自身需要，发起基于竞争的RA过程，以降低通信失败的可能性。
具体的，传统的基于竞争的RA过程可以如图1所示包括4个步骤，分别为：
101、终端向网络设备发送Msg1(message1，消息1)。Msg1承载在RACH上，用于承载终端发送给网络设备的前导序列(preamble)。其中，对于基于竞争的RA过程来说，preamble是由终端随机选择的。通常，preamble是承载在随机接入无线网络临时标识(random access radio network temporary identifier，RA-RNTI)指示的物理随机接入信道(physical random access channel，PRACH)资源上发送的。
102、网络设备接收到来自终端的Msg1，向终端返回Msg2。Msg2可以理解为网络设备发送给终端的对Msg1的响应，即随机接入响应(random access response，RAR)，承载在物理下行共享信道(physical downlink shared channel，PDSCH)上，可以包括临时小区无线网络临时标识(temporary cell radio network temporary identifier，temporary C-RNTI)、用于指示为Msg3分配的上行资源的信息、时间提前量(time advancing，TA)等。其中，为Msg3分配的上行资源为物理上行共享信道(physical uplink shared channel，PUSCH)资源。
103、终端接收到来自网络设备的Msg2，向终端发送Msg3。Msg3承载在PUSCH上，用于终端向网络设备请求建立无线资源控制(radio resource control，RRC)连接。
104、网络设备接收到来自终端的Msg3，向终端返回Msg4。Msg4承载在PDSCH上，用于基站通知终端随机接入竞争成功。
随着无线通信技术的发展，为了减少基于竞争的随机接入过程的时延，引入了2步(2-step)的基于非竞争的随机接入过程，具体如图2所示，分别为：
201、终端向网络设备发送MsgA。MsgA包括了传统的基于竞争的SA过程中Msg1和Msg3的功能。
202、网络设备接收到来自终端的MsgA，向终端发送MsgB。MsgB包括了传统的基于竞争的SA过程中Msg2和Msg4的功能。
其中，Msg1、Msg2、Msg3和Msg4可以参见图1中的相关介绍。可以理解的是，Msg1和Msg3虽然是并行发送的，但是Msg1承载在RACH上，Msg3承载在PUSCH上。
进一步的，在一些实施例中，终端接收到来自网络设备的Msg4或MsgB，还向网络设备发送无线资源控制(radio resource control，RRC)连接建立完成(RRC setup complete)消息。其中，RRC建立完成消息承载在PUSCH上，用于终端通知基站随机接入过程完成。
PUSCH的上行发射功率可以理解为承载在PUSCH上的消息所使用的发射功率，受PUSCH发射功率的上限的限制。其中，PUSCH发射功率的上限与终端的最大发射功率能力和功率回退有关。
示例的，PUSCH发射功率的上限满足下述表达式：
P cmax_L,f,c≤P cmax,f,c≤P cmax_H,f,c；
P cmax_H,f,c＝min{P EMAX,c-ΔT C,c，
(P powerClass-ΔP powerClass)-max(max(MPR c，A-MPR c)+ΔT IB,c+ΔT C,c+ΔT RxSRS,c),P-MPR c)}；
P cmax_H,f,c＝min{P EMAX,c,P powerClass-ΔP powerClass}
其中，P cmax,f,c为PUSCH发射功率的上限，P cmax_L,f,c为PUSCH发射功率的上限的最小值，P cmax_H,f,c为PUSCH发射功率的上限的最大值，P EMAX,c为网络设备通过RRC信令指示给终端的最大发射功率，ΔT C,c为常数，P powerClass为终端的最大发射功率能力，ΔP powerClass为常数，MPR c为最大发射功率回退值，A-MPR c为额外功率回退值，ΔT IB,c为额外功率偏移量，ΔT RxSRS,c为常数，P-MPR c为满足人体吸收终端的电磁辐射量标准时的最大功率回退值。具体的，关于P cmax,f,c、P cmax_L,f,c、P cmax_H,f,c、P EMAX,c、ΔT C,c、P powerClass、ΔP powerClass、MPR c、A-MPR c、ΔT IB,c、ΔT RxSRS,c和P-MPR c可以参见3GPP TS 38.101-1 V15.6.0中的相关介绍，在此不再赘述。
在忽略上述关于PUSCH发射功率的上限的表达式中一些与场景相关的常量，仅考虑终端的最大发射功率能力、MPR c和P-MPR c的情况下，PUSCH发射功率的上限的表达式可以简化为表达式1：
P cmax＝P max-max(MPR，P-MPR)             1
P cmax为PUSCH发射功率的上限，P max为终端的最大发射功率能力，MPR为最大发射功率回退值，P-MPR为满足人体吸收终端的电磁辐射量标准时最大发射功率回退值。
人体吸收终端的电磁辐射量可以通过特殊吸收比率(specific asorption rate，SAR)衡量。SAR指的是6分钟内，每千克人体组织吸收的电磁辐射量。一般来说，SAR越大，表示人吸收终端的电磁辐射量越大。美国联邦通信委员会(federal communications commission，FCC)规定人体吸收终端的电磁辐射量标准为SAR低于1.6瓦/千克。欧洲和中国采用的人体吸收终端的电磁辐射量标准是SAR不高于2瓦/千克。具体的，P-MPR是终端根据手机与人体之间的距离和人体吸收终端的电磁辐射量标准确定的。
进一步的，如果不考虑P-MPR对终端发射功率的上限的影响，表达式1还可以进一步简化为表达式2：
P cmax＝P max-MPR                2
需要说明的是，MPR是根据PUSCH采用的波形、调制方式和PUSCH资源位置确定的。PUSCH采用的波形、调制方式和PUSCH资源位置是网络设备指示给终端的。其中，不同的波形、调制方式和PUSCH资源位置的MPR是终端出厂之前预先存储在终端的。一般来说，MPR不会超过通信协议的规定。例如，在NR协议中关于MPR的规定可以参见表1：
表1
Figure PCTCN2021080518-appb-000001
例如，当终端采用的波形为CP-OFDM、调制方式为QPSK、且网络设备为终端调度的PUSCH资源为Inner RB时，MPR的取值最大不得超过1.5dB。比如，终端的最大发射功率能力为23dB，则在终端采用的波形为CP-OFDM、调制方式为QPSK、且网络设备为终端调度的PUSCH资源为Inner RB的情况下，终端最多回退1.5dB，即终端的PUSCH发射功率上限可以达到21.5dB。
需要说明的是，表1中边界资源块(edge resource block，Edge RB)指的是位于用于NR通信的频带边界上的RB，外部资源块(outere resource block，Outer RB)位于内部资源块(inner resource block，Inner RB)和Edge RB之间。例如，以用于NR通信的频带的带宽为20M为例，如图3所示为一个用于NR通信的频带的示意图，位于频率f1和频率f2之间或频率f5和频率f6之间的RB为Edge RB，位于频率f2和频率f3之间或频率f4和频率f5之间的RB为Outer RB，位于频率f3和频率f4之间的RB为Inner RB。
一般来说，MPR越大，ACLR、EVM等上行发送信号的性能指标的余量也越大，上行发送信号质量也就越高。因此，通常，针对不同位置的PUSCH资源、不同的调度方式和波形来说，终端中存储的MPR为通信协议规定的最大值。以表1为例，对于Outer RB、QPSK和CP-OFDM来说，MPR的最大值为1.5dB，因此，针对Outer RB、QPSK和CP-OFDM来说，存储在终端的MPR为1.5dB。
需要说明的是，以ACLR为例，ACLR的余量指的是：终端确定PUSCH发射功率的上限使用某一MPR时的ACLR与在恰好满足上行发射性能要求的情况下的ACLR之间的差量。因此，当终端确定PUSCH发射功率的上限使用的MPR为通信协议的最大值时，ACLR的余量最大。其中，上行发射性能要求可以通过通信协议定义。EVM等其他指标的余量与ACLR的余量类似，在此不再一一介绍。可以理解的是，终端中针对不同波形、调制方式和不同位置的资源存储的MPR也可以为在ACLR、EVM等指标满足上行发射性能 要求时的一个不超过通信协议规定的值。
例如，以表1为例，对于Outer RB、QPSK和CP-OFDM来说，MPR的最大值为1.5dB，因此，针对Outer RB、QPSK和CP-OFDM来说，存储在终端的MPR可以小于1.5dB，例如，针对Outer RB、QPSK和CP-OFDM来说，存储在终端的MPR为1.3dB。在这种情况下，如果终端的最大发射功率能力为23dB，则终端的PUSCH发射功率的最大值为21.7dB。
但是，在采用基于竞争随机接入过程实现终端与基站之间上行同步的情况下，如果MPR较大，则容易限制PUSCH发射功率上限的大小，从而导致随机接入失败，造成网络卡顿等现象。例如，针对Inner RB、QPSK和CP-OFDM存储的MPR为1.5dB，在网络设备针对Msg3调度的资源为Inner RB，调制方式为QPSK，波形为CP-OFDM的情况下，则终端确定的MPR为1.5dB。因此，终端后续则使用1.5dB进行功率回退，虽然使得ACLR、EVM等指标的余量达到了最大，但是限制了PUSCH发射功率的上限的大小，从而导致Msg3发射失败，造成终端的随机接入失败。
有鉴于此，本申请实施例提供了一种上行功率控制方法，通过降低终端随机接入过程中MPR的大小，提高随机接入过程中PUSCH发射功率的上限，这样虽然减小了ACLR、EVM等指标的余量，但是有助于提高随机接入成功的可能性，减少网络卡顿的次数，有助于提高用户体验。进一步的，当终端随机接入后的上行通信来说，可以无需降低MPR，虽然可能会限制PUSCH发射功率上限，但是保持了ACLR、EVM等指标的余量，信号质量较高。
应理解，本申请实施例中“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A、B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一(项)个”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a、b或c中的至少一项(个)，可以表示：a，b，c，a和b，a和c，b和c，或a、b和c，其中a、b、c可以是单个，也可以是多个。
应当理解，在本申请使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。
另外，尽管在本申请可能采用术语第一、第二、第三等来描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本申请范围的情况下，第一信息也可以被称为第二信息，类似地，第二信息也可以被称为第一信息。取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”。
图4示出了本申请实施例适用的一种通信系统的架构图。如图所示，本申请实施例的通信系统包括网络设备和终端。终端与网络设备之间的通信方式为无线通信。其中，本申请实施例的终端是一种具有无线收发功能的设备，可以称为终端设备(terminal equipment)、用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)、接入终端设备、车载终端设备、工业控制终端设备、UE单元、UE站、移动站、远方站、远程终端设备、移动设备、UE终端设备、无线通信设备、UE代理或UE装置等。终端的位置可以是固定的或者移动的。需要说明的是，终端可以支持至少一种无线通信技 术，例如长期演进(long term evolution，LTE)、NR、宽带码分多址(wideband code division multiple access，WCDMA)等。例如，终端可以是手机(mobile phone)、平板电脑(pad)、台式机、笔记本电脑、一体机、车载终端、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、可穿戴设备、未来移动通信网络中的终端或者未来演进的公共移动陆地网络(public land mobile network，PLMN)中的终端等。又例如，本申请实施例的终端还可以是具有收发功能的装置，例如芯片系统。其中，芯片系统可以包括芯片，还可以包括其它分立器件。
本申请实施例的网络设备是一种为终端提供无线接入功能的设备，也可称之为接入网设备、无线接入网(radio access network，RAN)设备等。其中，网络设备可以支持至少一种无线通信技术，例如LTE、NR、WCDMA等。示例的，网络设备包括但不限于：第五代移动通信系统(5th-generation，5G)中的下一代基站(generation nodeB，gNB)、演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved node B、或home node B，HNB)、基带单元(baseband unit，BBU)、收发点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心、小站、微型站等。网络设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)、和/或分布单元(distributed unit，DU)，或者网络设备可以为中继站、接入点、车载设备、终端设备、可穿戴设备以及未来移动通信中的网络设备或者未来演进的PLMN中的网络设备等。在一些实施例中，网络设备还可以为具有为终端提供无线通信功能的装置，例如芯片系统。示例的，芯片系统可以包括芯片，还可以包括其它分立器件。
应理解，图4所示的通信系统仅是一种示例性说明，并不构成对本申请实施例的通信系统的限定。示例的，本申请实施例不限定通信系统中网络设备的个数、终端的个数。例如，当本申请实施例的通信系统中包括多个网络设备时，网络设备与网络设备之间可以进行多点协同通信。例如，通信系统中包括多个宏基站、多个微基站，其中宏基站与宏基站、微基站与微基站、宏基站与微基站间可以进行多点协同通信。
需要说明的是，本申请实施例描述的通信系统的架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着通信系统的架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
以下结合图4所示的通信系统对本申请实施例的上行功率控制方法进行介绍。
示例的，如图5所示，为本申请实施例的一种上行功率控制方法，具体包括以下步骤。
501、终端向网络设备发送随机接入请求。该随机接入请求用于发起基于竞争的随机接入过程。
示例的，终端可以在接收到网络设备的第一指示信息后，向网络设备发送随机接入请求。第一指示信息用于指示终端发起基于竞争的随机接入过程。又示例的，终端还可以在初始接入时，向网络设备发送随机接入请求。例如，终端可以在开机或关闭飞行模式时，触发初始接入。又示例的，终端还可以在小区切换时，向网络设备发送随机接入请求。或者，终端在上行不同步、或RRC连接重建、或者transition from RRC_INACTIVE等时，向网络设备发送随机接入请求。
需要说明的是，上述仅为触发终端向网络设备发送随机接入请求的举例说明，并不够成对本申请实施例触发终端向网络设备发送随机接入请求的限定。本申请实施例中，还可以通过其它方式触发终端向网络设备发送随机接入请求。
502、网络设备接收到来自终端的随机接入请求后，向终端发送RAR。该RAR用于指示PUSCH的调制方式和/或PUSCH资源。例如，RAR包括PUSCH调制信息和PUSCH资源信息，其中，PUSCH的调制信息用于指示PUSCH的调制方式，PUSCH资源信息用于指示PUSCH资源的位置和大小。
需要说明的是，在无线通信系统仅支持一个波形的情况下，网络设备可以无需指示终端PUSCH所使用的波形。例如，LTE中支持的波形为DTF-s-OFDM，对于终端来说，网络设备可以无需向终端指示PUSCH所使用的波形，终端可以默认PUSCH使用的波形为DFT-s-OFDM。进一步的，在支持多个波形的情况下，例如NR中，支持CP-OFDM和DFT-s-OFDM两种波形，在一些实施例中，RAR还可以用于指示PUSCH采用的波形。在这种情况下，RAR还可以包括PUSCH波形指示信息。或者，PUSCH采用的波形可以是由网络设备通过RRC信令将PUSCH采用的波形指示给终端的。对此不作限定。
在一些实施例中，网络设备在接收到来自终端的随机接入请求后，可以根据终端和网络设备之间的路径损耗和干扰水平等，为终端分配PUSCH资源以及确定PUSCH调制方式等。进一步的，在PUSCH的调制信息还指示PUSCH使用的波形的情况下，网络设备还可以根据终端和网络设备之间的路径损耗和干扰水平等，从支持的所有波形中确定PUSCH所使用的波形。需要说明的是，上述仅为一种分配PUSCH资源、确定PUSCH调制方式和波形的举例说明，分配PUSCH资源、确定PUSCH调制方式和波形为网络设备内部的一种具体实现，本申请实施例并不做限定。
503、终端接收到来自网络设备发送的RAR后，根据PUSCH资源、PUSCH采用的调制方式和PUSCH采用的波形，确定第一MPR。其中，第一MPR为终端中预先存储的与PUSCH采用的调制方式、PUSCH采用的波形以及PUSCH资源对应的MPR。
例如，以PUSCH采用的波形为CP-OFDM、调制方式为QPSK，PUSCH资源为Inner RB为例，如表1所示，在波形为CP-OFDM、调制方式为QPSK且PUSCH资源为Inner RB时，MPR最大不得超过1.5dB，因此，在这种情况下，终端针对CP-OFDM、QPSK和Inner RB存储的MPR不得超过1.5dB。如果终端真毒CP-OFDM、QPSK和Inner RB存储的MPR为1dB，则第一MPR为1dB。
504、终端以第一步长降低第一MPR，得到第二MPR。
示例的，第一步长可以是一个固定的值，可以是通过协议预定义的。例如，通过通信协议可以针对不同波形、调制方式和资源设置不同的第一步长。例如，针对不同波形、调制方式和资源设置的第一步长可以如表2所示。
表2
Figure PCTCN2021080518-appb-000002
例如，以PUSCH采用的波形为CP-OFDM、调制方式为QPSK，PUSCH资源为Inner RB为例，如表1所示与CP-OFDM、QPSK和Inner RB对应的第一步长为N G1，则终端将第一MPR减小N G1，得到第二MPR。需要说明的是，在第一MPR小于N G1的情况下，终端将第一MPR减小N G1，得到的第二MPR为0。
在一些实施例中，第一步长可以是在ACLR、EVM等指标满足上行发射性能要求的情况下，ACLR、EVM等指标的余量最小时测量得到的，以避免信号质量过差。
需要说明的是，上述仅为一种通过协议预定义第一步长的举例说明，并不构成对本申请实施例的限定。当然，在本申请实施例中，还可以通过协议预定义一个第一步长范围，由终端根据自身需要确定实际所使用的第一步长。
又示例的，第一步长还可以是网络设备指示给终端的。例如，网络设备可以通过RAR将第一步长指示给终端。在这种情况下，终端可以先判断第一MPR是否大于第一步长，若第一MPR大于第一步长，则终端以第一步长降低第一MPR，得到第二MPR。在另一些实施例中，若第一MPR小于或等于第一步长，则终端将第一MPR降低为0，即第二MPR为0。从而有助于避免溢出。
又示例的，第一步长还可以是终端根据某一算法或策略确定的。例如，终端在ACLR、EVM等指标满足上行发射性能要求的情况下，将ACLR、EVM等指标的余量降低为0或者一个小于最大余量的值时第一MPR需要降低的值作为第一步长。再例如，第一步长等于第一MPR。在这种情况下，第二MPR的取值为0。再例如，终端确定第一步长的策略为：第一步长等于第一MPR与一个权重系数的乘积，比如该权重系数为0.5，则第二MPR为第一MPR的一半。其中，该权重系数可以是通过协议预定义的，也可以是由网络设备指示给终端的。上述仅是以权重系数为0.5为例进行说明的，本申请实施例中不限定权重系数的大小。可以理解的是，这里的权重系数为一个大于0、且小于或等于1的值。示例的，权重系数可以是根据ACLR、EVM等指标的余量大小确定的。需要指出的是，本申请 实施例中还可以通过其它方式确定权重系数，对此不作限定。
上述仅是对第一步长的获取方式的举例说明，本申请实施例对第一步长的具体获取方式并不做限定。
505、终端根据终端的最大发射功率能力和第二MPR，确定用于承载MSG3的PUSCH发射功率的上限为第一发射功率上限值。
506、终端采用第一上行发射功率，向网络设备发送Msg3。其中，第一上行发射功率是根据第一发射功率上限值确定的。
示例的，第一上行发射功率满足表达式3：
Figure PCTCN2021080518-appb-000003
其中，
Figure PCTCN2021080518-appb-000004
为第一上行发射功率，P cmax,f,c(i)为PUSCH发射功率的上限，P o_PUSCH,b,f,c(j)为PUSCH的初始发射功率，μ为传输带宽对发送功率的影响因子，
Figure PCTCN2021080518-appb-000005
为传输带宽，α b,f,c(j)为路损折算因子，PL b,f,c(q d)为终端与网络设备之间的下行路径损耗，Δ TF,b,f,c(i)为码率对发射功率的影响量，f b,f,c(i，l)为网络设备通过发射功率功控(transmit power control，TPC)命令所指示的功率调整量。具体的，关于
Figure PCTCN2021080518-appb-000006
P o_PUSCH,b,f,c(j)、μ、
Figure PCTCN2021080518-appb-000007
α b,f,c(j)、PL b,f,c(q d)、Δ TF,b,f,c(i)、f b,f,c(i，l)可以参见3GPP TS 38.213 V15.6.0中的相关介绍。
而P cmax,f,c(i)是根据第二MPR和终端的最大发射功率能力确定的，例如，P cmax,f,c(i)满足表达式4：
P cmax.f.c(i)＝P max-MPR               4
P max为终端的最大发射功率能力，MPR为第二MPR。
由于用于承载Msg3的PUSCH发射功率的上限是根据终端的最大发射能力和第二MPR确定的，而第二MPR小于第一MPR，与根据第一MPR确定用于承载Msg3的PUSCH发射功率的上限相比，有助于提高PUSCH发射功率的上限的可能性，从而有助于提高Msg3的上行发射功率，进一步有助于提高通过基于竞争的随机接入过程接入网络成功的可能性，减少网络卡顿的次数，提高用户体验。
507、网络设备接收到来自终端的Msg3，向终端发送Msg4。
进一步的，在一些实施例中，还包括506、终端接收到来自网络设备的Msg4后，首先，根据用于承载RRC连接建立完成消息的PUSCH资源、所采用的波形和调制方式，确定第三MPR。其次，终端以第二步长降低第三MPR得到第四MPR，并根据第四MPR和终端的最大发射功率能力，确定用于承载RRC连接建立完成消息的PUSCH发射功率的上限。然后，根据用于承载RRC连接建立完成消息的PUSCH发射功率的上限，确定第二发射功率，并以第二发射功率向网络设备发送RRC连接建立完成消息。其中，RRC连接建立完成消息是承载在PUSCH上发送的。
需要说明的是，RRC连接建立完成消息所使用的波形、调制方式和承载RRC连接完成消息所使用的资源位置中的部分或全部可以是网络设备通过Msg4或Msg2或其他控制信息指示给终端的，或者，部分也可以是预先定义的。
终端发送RRC连接建立完成消息所使用的第二步长，与终端发送Msg3所使用的第一步长可以相同，也可以不同，具体可以参见发送Msg3时关于第一步长的介绍，在此不再赘述。
需要说明的是，本申请实施例中，在另一些实施例中，上述步骤503～步骤504还可以替换为下述步骤：
终端在接收到RAR后，根据终端的最大发射功率能力和第二MPR，确定用于承载MSG3的PUSCH发射功率的上限为第一上行发射功率上限值。其中，第二MPR的取值为固定值，且小于第一MPR，例如0。从而无需确定第一MPR，减少运算量，提高随机接入的效率。类似的，对于RA过程中的承载在PUSCH上的RRC连接建立完成消息来说，终端也可以根据终端的最大发射功率能力和第二MPR，确定PUSCH发射功率的上限为第一值。其中，第二MPR的取值为固定值，且小于第一MPR。
在本申请的另一些实施例中，而对于终端随机接入后，某一承载在PUSCH上的上行消息来说，终端发送该上行消息所使用的上行发射功率的上限，是根据终端的最大发射功率能力和第五MPR确定的，第五MPR为终端中存储的与该上行消息所使用的波形、调制方式和承载该上行消息的资源位置对应的MPR。也就是说，在终端接入网络后，无需降低MPR。
例如，以PUSCH资源为Outer RB、调制方式为QPSK、波形为DFT-o-OFDM为例，终端针对Outer RB、QPSK和DFT-OFDM存储的MPR为1dB，即第一MPR为1dB，而针对Outer RB、QPSK和DFT-OFDM的第二MPR为0.5dB。在终端的最大发射能力为23dB的情况下，则对于Msg3或者RRC连接建立完成消息来说，用于承载Msg3或者RRC连接建立完成消息的PUSCH发射功率的上限为22.5dB，而在终端接入网络后，用于承载上行消息的PUSCH发射功率的上限为22dB。
需要说明的是，图5所示的上行功率控制方法还可以应用于图2所示的基于竞争的随机接入流程。
基于上述各实施例，本申请实施例提供了一种上行功率控制方法，如图6所示，具体包括以下步骤：
601、网络设备向终端发送下行控制消息，该下行控制消息用于指示PUSCH采用的调制方式和/或PUSCH资源。进一步的，在一些实施例中，该下行控制信息还用于指示PUSCH采用的波形。或者，PUSCH采用的波形是由网络设备通过RRC信令指示给终端的。又或者，PUSCH采用的波形是通过协议预定义的等，对此不作限定。
示例的，本申请实施例中的下行控制消息可以为format 0_0或0_1的下行控制信息(downlink control information，DCI)。例如，对于DCI format 0_0来说，可以由小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)或配置调度无线网络临时标识(configured scheduling radio network temporary identifier，CS-RNTI)或MCS-C-RNTI加扰。其中，频域资源分配(frequency domain resource assignment)用于指示PUSCH资源，调制与编码策略(modulation and code scheme，MCS)用于指示PUSCH的调制方式，通常为5bite。关于DCI format 0_0和0_1的相关介绍可以参见3GPP TS 38.212V15.6.0中的相关描述，在此不再赘述。
602、终端接收到来自网络设备的下行控制消息，根据PUSCH采用的调制方式、波形以及PUSCH资源，生成待发送的上行消息。
603、当待发送的上行消息不为目标消息时，终端以第一上行发射功率向网络设备发送该待发送的上行消息。
例如，第一上行发射功率为终端的最大发射功率减去第一MPR，第一MPR为终端中存储的与PUSCH采用的波形和调制方式、PUSCH资源对应的MPR。又例如，终端根据第一MPR确定PUSCH发射功率的上限。然后，终端根据第一MPR确定PUSCH发射功率的上限确定第一上行发射功率，再以第一上行发射功率向网络设备发送该待发送的上行消息。
其中，目标消息为基于竞争的SA过程中承载在PUSCH上的消息，例如Msg3,、RRC连接建立完成消息。
604、当待发送的上行消息为目标消息时，终端以第二上行发射功率发送该待发送的上行消息。其中，第二上行发射功率大于第一上行发射功率。
例如，第二上行发射功率为终端的最大发射功率减去第二MPR，第二MPR小于第一MPR。又例如，终端根据第二MPR确定PUSCH发射功率的上限。然后，终端根据第二MPR确定PUSCH发射功率的上限确定第二上行发射功率，再以第二上行发射功率向网络设备发送该待发送的上行消息。第二MPR小于第一MPR，可以是以第一步长降低第一MPR得到的，也可以为一个固定值，例如0。第一MPR为终端中存储的与PUSCH采用的波形和调制方式、PUSCH资源位置对应的MPR。
由于待发送的上行消息为目标消息的情况下，根据第二MPR确定PUSCH发射功率的上限，有助于提高终端发射功率的上限的可能性，从而有助于提高RA过程中的上行发射功率，进一步有助于提高通过RA过程接入网络成功的可能性，减少网络卡顿的次数，提高用户体验。
以上各个实施例可以单独使用，也可以相互结合使用，以实现不同的技术效果。
上述本申请提供的实施例中，从终端作为执行主体的角度对本申请实施例提供的通信方法进行了介绍。为了实现上述本申请实施例提供的通信方法中的各功能，终端可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
与上述构思相同，如图7所示，本申请实施例还提供一种装置700，该装置700包括接收模块701和发送模块702。
其中，接收模块701用于接收来自网络设备的下行控制消息，发送模块702用于当待发送的上行消息为目标消息时，以第一上行发射功率向网络设备发送待发送的上行消息；当待发送的上行消息不为目标消息时，以第二上行发射功率向网络设备发送待发送的上行消息。
关于接收模块701、发送模块702的具体执行过程，可参见上方法实施例中的记载。本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，另外，在本申请各个实施例中的各功能模块可以集成在一个处理器中，也可以是单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
与上述构思相同，如图8所示，本申请实施例还提供一种装置800。
一示例中，该装置800用于实现上述方法中终端的功能，该装置可以是终端，也可以 是终端中的芯片或芯片系统。装置800包括至少一个处理器801，用于实现上述方法中终端的功能。示例地，处理器801可以用于当待发送的上行消息为目标消息时，以第一上行发射功率向网络设备发送待发送的上行消息；当待发送的上行消息不为目标消息时，以第二上行发射功率向所述网络设备发送待发送的上行消息，具体参见方法中的详细描述，此处不再说明。
在一些实施例中，装置800还可以包括至少一个存储器802，用于存储程序计算机程序。存储器802和处理器801耦合。本申请实施例中的耦合是装置、单元或模块之间的间隔耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。作为另一种实现，存储器802还可以位于装置800之外。处理器801可以和存储器802协同操作。处理器801可能执行存储器802中存储的计算机程序。所述至少一个存储器中的至少一个可以包括于处理器中。
在一些实施例中，装置800还可以包括通信接口803，用于通过传输介质和其它设备进行通信，从而用于装置800中的装置可以和其它设备进行通信。示例性地，通信接口803可以是收发器、电路、总线、模块或其它类型的通信接口，该其它设备可以是其它终端或网络设备。处理器801利用通信接口803收发消息，并用于实现上述实施例中的方法。示例性的，通信接口803可以用于接收来自网络设备的下行控制消息。
本申请实施例中不限定上述通信接口803、处理器801以及存储器802之间的连接介质。例如，本申请实施例在图8中以存储器802、处理器801以及通信接口803之间可以通过总线连接，所述总线可以分为地址总线、数据总线、控制总线等。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中，存储器可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
本申请实施例提供的方法中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、网络设备、用户设备或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，简称DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机可以存取的任何可用介质或者是包含一个或多个 可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(digital video disc，简称DVD))、或者半导体介质(例如,SSD)等。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种上行功率控制方法，其特征在于，所述方法包括：
    终端接收来自网络设备的下行控制消息，所述下行控制消息用于指示物理上行共享信道PUSCH采用的调制方式和/或PUSCH资源；
    所述终端当待发送的上行消息不为目标消息时，以第一上行发射功率向所述网络设备发送所述待发送的上行消息；
    所述终端当待发送的上行消息为目标消息时，以第二上行发射功率向所述网络设备发送所述待发送的上行消息；
    所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一最大功率回退MPR和所述终端的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
  2. 如权利要求1所述的方法，其特征在于，所述第一上行发射功率等于所述终端的最大发射功率减去所述第一MPR。
  3. 如权利要求1或2所述的方法，其特征在于，所述第二上行发射功率等于所述终端的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
  4. 如权利要求3所述的方法，其特征在于，所述第二MPR为以第一步长降低所述第一MPR得到的，所述第一步长大于0。
  5. 如权利要求4所述的方法，其特征在于，所述第一步长为预定义的，或者所述第一步长是所述终端根据所述第二MPR确定的。
  6. 如权利要求3所述的方法，其特征在于，所述第二MPR为0。
  7. 如权利要求1至6任一所述的方法，其特征在于，所述目标消息为随机接入过程中的消息Msg3、和/或无线资源控制RRC连接建立完成消息。
  8. 如权利要求1至7任一所述的方法，其特征在于，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为所述终端接入网络后承载在PUSCH上的消息。
  9. 如权利要求1至8任一所述的方法，其特征在于，所述PUSCH采用的调制方式为Pi/2BPSK、QPSK、16QAM、64QAM和/或256QAM中的一种。
  10. 如权利要求1至9任一所述的方法，其特征在于，所述PUSCH采用的波形为离散傅立叶变换扩展正交频分复用DFT-s-OFDM或循环前缀-正交频分复用CP-OFDM中的一种。
  11. 如权利要求1至10任一所述的方法，其特征在于，所述下行控制消息还用于指示所述PUSCH采用的波形；或者，
    所述终端接收来自所述网络设备的RRC信令，所述RRC信令用于指示所述PUSCH采用的波形。
  12. 一种终端，其特征在于，包括：接收模块和发送模块；
    所述接收模块，用于接收来自网络设备的下行控制消息，所述下行控制消息用于指示物理上行共享信道PUSCH采用的调制方式和/或PUSCH资源；
    所述发送模块，用于当待发送的上行消息不为目标消息时，以第一上行发射功率向所述网络设备发送所述待发送的上行消息；或者，当待发送的上行消息为目标消息时，以第 二上行发射功率向所述网络设备发送所述待发送的上行消息；
    所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一最大功率回退MPR和所述终端的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
  13. 如权利要求12所述的终端，其特征在于，所述第一上行发射功率等于所述终端的最大发射功率减去所述第一MPR。
  14. 如权利要求12或13所述的终端，其特征在于，所述第二上行发射功率等于所述终端的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
  15. 如权利要求14所述的终端，其特征在于，所述第二MPR为以第一步长降低所述第一MPR得到的，所述第一步长大于0。
  16. 如权利要求15所述的终端，其特征在于，所述第一步长为预定义的，或者所述第一步长是所述终端根据所述第二MPR确定的。
  17. 如权利要求14所述的终端，其特征在于，所述第二MPR为0。
  18. 如权利要求12至17任一所述的终端，其特征在于，所述目标消息为随机接入过程中的消息Msg3、和/或无线资源控制RRC连接建立完成消息。
  19. 如权利要求12至18任一所述的终端，其特征在于，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为所述终端接入网络后承载在PUSCH上的消息。
  20. 如权利要求12至19任一所述的终端，其特征在于，所述PUSCH采用的调制方式为Pi/2BPSK、QPSK、16QAM、64QAM和/或256QAM中的一种。
  21. 如权利要求12至20任一所述的终端，其特征在于，所述PUSCH采用的波形为离散傅立叶变换扩展正交频分复用DFT-s-OFDM或循环前缀-正交频分复用CP-OFDM中的一种。
  22. 一种芯片，其特征在于，包括：处理器和通信接口；
    所述通信接口，用于接收来自网络设备的下行控制消息，所述下行控制消息用于指示物理上行共享信道PUSCH采用的调制方式和/或PUSCH资源；
    所述处理器，用于当待发送的上行消息不为目标消息时，控制所述通信接口以第一上行发射功率向所述网络设备发送所述待发送的上行消息；或者，当待发送的上行消息为目标消息时，控制所述通信接口以第二上行发射功率向所述网络设备发送所述待发送的上行消息；
    所述目标消息为随机接入过程中承载在PUSCH上的消息，所述第一上行发射功率是根据第一最大功率回退MPR和所述芯片的最大发射功率能力确定的，所述第一MPR是根据所述PUSCH采用的调制方式、所述PUSCH资源和PUSCH采用的波形得到的，所述第二上行发射功率大于所述第一上行发射功率。
  23. 如权利要求22所述的芯片，其特征在于，所述第一上行发射功率等于所述芯片的最大发射功率减去所述第一MPR。
  24. 如权利要求22或23所述的芯片，其特征在于，所述第二上行发射功率等于所述芯片的最大发射功率减去所述第二MPR，所述第二MPR小于所述第一MPR。
  25. 如权利要求24所述的芯片，其特征在于，所述第二MPR为以第一步长降低所述第一MPR得到的，所述第一步长大于0。
  26. 如权利要求25所述的芯片，其特征在于，所述第一步长为预定义的，或者所述第一步长是根据所述第二MPR确定的。
  27. 如权利要求24所述的芯片，其特征在于，所述第二MPR为0。
  28. 如权利要求22至27任一所述的芯片，其特征在于，所述目标消息为随机接入过程中的消息Msg3、和/或无线资源控制RRC连接建立完成消息。
  29. 如权利要求22至28任一所述的芯片，其特征在于，当所述待发送的上行消息不为目标消息，所述待发送的上行消息为接入网络后承载在PUSCH上的消息。
  30. 一种计算机可读存储介质，其特征在于，存储有计算机程序，所述计算机程序被计算机执行时，使得所述计算机执行如权利要求1至11任一项所述的方法。
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