WO2020143835A1 - 功率控制方法及功率控制装置 - Google Patents

功率控制方法及功率控制装置 Download PDF

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Publication number
WO2020143835A1
WO2020143835A1 PCT/CN2020/071813 CN2020071813W WO2020143835A1 WO 2020143835 A1 WO2020143835 A1 WO 2020143835A1 CN 2020071813 W CN2020071813 W CN 2020071813W WO 2020143835 A1 WO2020143835 A1 WO 2020143835A1
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Prior art keywords
terminal device
signal
value
power
transmission power
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Ceased
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PCT/CN2020/071813
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English (en)
French (fr)
Inventor
薛祎凡
王键
张兴炜
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP20738985.9A priority Critical patent/EP3890409B1/en
Priority to JP2021540210A priority patent/JP7259049B2/ja
Priority to CN202080007933.7A priority patent/CN113302990A/zh
Priority to KR1020217021218A priority patent/KR102551990B1/ko
Priority to US17/421,869 priority patent/US11856393B2/en
Publication of WO2020143835A1 publication Critical patent/WO2020143835A1/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
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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
    • 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
    • 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
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • 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
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/322—Power control of broadcast channels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technology, and in particular to a power control method and power control device.
  • the technology of the Internet of Everything includes not only narrowband Internet of Things (NB-LOT) technology and enhanced machine type communication (eMTC), but also It can include IoT, end-to-end (device to device, D2D) technology, and so on.
  • NB-LOT narrowband Internet of Things
  • eMTC enhanced machine type communication
  • IoT end-to-end (device to device, D2D) technology
  • data can be directly sent between two terminal devices, that is, there is no need to send the data to the base station first, and then forwarded through the core network, etc., which can greatly reduce the data delay. That is to say, in the above-mentioned sidelink transmission, the terminal device and the terminal device communicate with each other. Specifically, in LTE D2D, when the terminal device communicates with the terminal device, the transmitting end transmits the signal with the maximum transmission power to ensure the transmission reliability.
  • This application provides a power control method and power control device, which can reasonably perform power control.
  • an embodiment of the present application provides a power control method, including: a first terminal device determines a transmission power of a first signal according to a first value; wherein, the first value is a value in a reference value set, The reference value set includes at least two power values, and the first value does not exceed the first power, and the first power is determined according to the maximum transmission power of the first signal; Two terminal devices send instruction information, the instruction information is used to indicate or include the first value; the first terminal device sends the first signal to the second terminal device with the transmission power of the first signal .
  • the first terminal device indicates the first value to the second terminal device, so that the second terminal device can obtain the estimated value of the path loss between the first terminal device and the second terminal device according to the first value, Therefore, the second terminal device effectively determines the transmission power of the signal (such as the second signal) during direct link transmission, and the reliability of signal transmission between the terminal devices is improved.
  • the signal such as the second signal
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the first value is determined by the path loss estimation value between the network device and the first terminal device, so that the transmission power of the first signal is too large, which may cause an uplink signal to be sent to the network device by other terminal devices Interference, thereby ensuring the reliability of transmission between terminal devices.
  • the reference value set is configured by the network device; or, the reference value set is predefined; or, the reference value set is The upper layer of the first terminal device is determined.
  • the first value is used to represent the transmit power on the first orthogonal frequency division multiplexing OFDM symbol where the first signal is located; or, The first value is used to represent the transmission power on the first resource element RE of the first OFDM symbol where the first signal is located; or, the first value is used to represent the first OFDM where the first signal is located The transmit power on the first resource block RB of the symbol.
  • the transmission power of the first signal is a power value corresponding to the first value; or, the transmission power of the first signal is the The sum of the power value corresponding to the first value and the offset power value.
  • the offset power value is predefined, or the offset power value is determined by the first terminal device.
  • the first signal includes a direct link synchronization signal block SSSB, and the SSSB includes a physical direct link broadcast channel PSBCH, a primary direct link A link synchronization signal PSSS and a secondary direct link synchronization signal SSSS; wherein the indication information includes at least one of the following: load information of the PSBCH; a sequence of the demodulation reference signal DMRS of the PSBCH; the PSBCH , The power difference between the PSSS and at least two of the SSSS.
  • the indication information includes a power difference between at least two of the PSBCH, the PSSS, and the SSSS
  • the first value There is a mapping relationship with the power difference; wherein, the mapping relationship is configured by the network device; or, the mapping relationship is predefined; or, the mapping relationship is determined by a high-level of the first terminal device .
  • the first signal includes a physical direct link shared channel PSSCH, and the indication information is carried in the PSSCH; or, the first A signal includes a physical direct link control channel PSCCH, and the indication information is carried in the PSCCH; or, the first signal includes a physical direct link feedback channel PSFCH, and the indication information is carried in the PSFCH.
  • the first signal includes a reference signal
  • the indication information includes a sequence of the reference signal
  • the reference signal is used to determine the first Channel state information between a terminal device and the second terminal device.
  • the The method further includes: the first terminal device receives a second signal from the second terminal device; wherein, the transmission power of the second signal is according to the difference between the first terminal device and the second terminal device The path loss estimate value is determined, and the path loss estimate value between the first terminal device and the second terminal device is determined according to the transmission power of the first signal and the reception power of the first signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • y(M) can also be understood as an expression or a relational expression of the bandwidth of the second signal, etc., which is not limited in the embodiments of the present application.
  • the transmission power of the second signal is based on an estimated path loss value between the first terminal device and the second terminal device and the The estimated value of the path loss between the network device and the second terminal device is determined.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • an embodiment of the present application further provides a power control method, including: a second terminal device receives a first signal and indication information from a first terminal device; wherein the indication information is used to indicate or include the first A value, the first value is a value in a reference value set, the reference value set includes at least two power values, and the first value does not exceed a first power, and the first power is based on the The maximum transmission power of a signal is determined; the second terminal device determines the path loss estimate value between the first terminal device and the second terminal device according to the indication information and the received power of the first signal.
  • the second terminal device can effectively determine the estimated value of the path loss between the first terminal device and the second terminal device through the indication information sent by the first terminal device and the received power of the first signal, so that The second terminal device may send other signals (such as the second signal) according to the estimated path loss between the first terminal device and the second terminal device, thereby avoiding the second terminal device from being unable to learn the first terminal device and the second terminal device
  • the estimated value of the path loss between the terminal devices causes the second terminal device to fail to effectively determine the transmission power of other signals, that is, the reliability of signal transmission between the terminal devices is improved.
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the second terminal device determines the first terminal device and the second terminal device according to the indication information and the received power of the first signal After the estimated path loss between, the method further includes: the second terminal device determining the transmission power of the second signal according to the estimated path loss between the first terminal device and the second terminal device; The second terminal device sends the second signal to the first terminal device at the transmission power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • the second terminal device determines the second signal according to an estimated path loss value between the first terminal device and the second terminal device Transmit power, including: the second terminal device according to the path loss estimate value between the first terminal device and the second terminal device and the path loss estimate between the network device and the second terminal device The value determines the transmission power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • the first terminal device includes a terminal device that has the largest path loss estimation value between the terminal device set and the second terminal device.
  • the terminal device set is a set of terminal devices that have established a connection with the second terminal device; or the terminal device set is a The second terminal device has established a connection and is a collection of terminal devices within a reference range from the second terminal device.
  • an embodiment of the present application provides a power control device, which can be used as a first terminal device, where the first terminal device includes: a processing unit configured to determine the transmission of the first signal according to the first value Power; wherein, the first value is a value in a reference value set, the reference value set includes at least two power values, and the first value does not exceed the first power, the first power is based on The maximum transmission power of the first signal is determined; a sending unit is used to send indication information to a second terminal device, the indication information is used to indicate or include the first value; the sending unit is also used to The transmission power of the first signal sends the first signal to the second terminal device.
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the reference value set is configured by the network device; or, the reference value set is predefined; or, the reference value set is The upper layer of the first terminal device is determined.
  • the first numerical value is used to represent the transmit power on the first orthogonal frequency division multiplexing OFDM symbol where the first signal is located; or, The first value is used to represent the transmission power on the first resource element RE of the first OFDM symbol where the first signal is located; or, the first value is used to represent the first OFDM where the first signal is located The transmit power on the first resource block RB of the symbol.
  • the transmission power of the first signal is a power value corresponding to the first value; or, the transmission power of the first signal is the The sum of the power value corresponding to the first value and the offset power value.
  • the offset power value is predefined, or the offset power value is determined by the first terminal device.
  • the first signal includes a direct link synchronization signal block SSSB, and the SSSB includes a physical direct link broadcast channel PSBCH and a primary direct link.
  • the indication information includes a power difference between at least two of the PSBCH, the PSSS, and the SSSS
  • the first value There is a mapping relationship with the power difference; wherein, the mapping relationship is configured by the network device; or, the mapping relationship is predefined; or, the mapping relationship is determined by a high-level of the first terminal device .
  • the first signal includes a physical direct link shared channel PSSCH, and the indication information is carried in the PSSCH; or, the first A signal includes a physical direct link control channel PSCCH, and the indication information is carried in the PSCCH; or, the first signal includes a physical direct link feedback channel PSFCH, and the indication information is carried in the PSFCH.
  • the first signal includes a reference signal
  • the indication information includes a sequence of the reference signal
  • the reference signal is used to determine the first Channel state information between a terminal device and the second terminal device.
  • the first terminal device further includes: a receiving unit configured to receive a second signal from the second terminal device; wherein, the first The transmission power of the two signals is determined according to the estimated value of the path loss between the first terminal device and the second terminal device, and the estimated value of the path loss between the first terminal device and the second terminal device is based on The transmission power of the first signal and the reception power of the first signal are determined.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • the transmission power of the second signal is based on an estimated path loss value between the first terminal device and the second terminal device and the The estimated value of the path loss between the network device and the second terminal device is determined.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • an embodiment of the present application further provides a power control device, which is used as a second terminal device, and the second terminal device includes: a receiving unit configured to receive the first terminal device from the first A signal and indication information; wherein the indication information is used to indicate or include a first value, the first value is a value in a reference value set, and the reference value set includes at least two power values, and the The first value does not exceed the first power, and the first power is determined according to the maximum transmission power of the first signal; the processing unit is configured to determine the first power according to the indication information and the received power of the first signal An estimated value of the path loss between a terminal device and the second terminal device.
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the processing unit is further configured to determine the second according to an estimated path loss value between the first terminal device and the second terminal device The transmission power of the signal; the second terminal device further includes: a sending unit, configured to send the second signal to the first terminal device with the transmission power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • the processing unit is specifically configured to estimate the path loss between the first terminal device and the second terminal device and the The estimated value of the path loss between the network device and the second terminal device determines the transmission power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • the first terminal device includes the terminal device with the largest path loss estimated value between the terminal device set and the second terminal device.
  • the terminal device set is a set of terminal devices that have established a connection with the second terminal device; or the terminal device set is a The second terminal device has established a connection and is a collection of terminal devices within a reference range from the second terminal device.
  • an embodiment of the present application further provides a terminal device, the terminal device is used as a first terminal device, the first terminal device includes a processor, a memory, and a transceiver, and the processor and the memory Coupling, the processor is used to run instructions or programs in the memory, and the processor is used to determine the transmission power of the first signal according to the first value; wherein the first value is one of the reference value set Value, the reference value set includes at least two power values, and the first value does not exceed the first power, the first power is determined according to the maximum transmit power of the first signal; the transceiver and the The processor is coupled, the transceiver is used to send indication information to a second terminal device, the indication information is used to indicate or include the first value; the transceiver is also used to transmit with the first signal The power sends the first signal to the second terminal device.
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the reference value set is configured by the network device; or, the reference value set is predefined; or, the reference value set is The upper layer of the first terminal device is determined.
  • the first value is used to represent the transmit power on the first orthogonal frequency division multiplexing OFDM symbol where the first signal is located; or, The first value is used to represent the transmission power on the first resource element RE of the first OFDM symbol where the first signal is located; or, the first value is used to represent the first OFDM where the first signal is located The transmit power on the first resource block RB of the symbol.
  • the transmission power of the first signal is a power value corresponding to the first value; or, the transmission power of the first signal is the The sum of the power value corresponding to the first value and the offset power value.
  • the offset power value is predefined, or the offset power value is determined by the first terminal device.
  • the first signal includes a direct link synchronization signal block SSSB, and the SSSB includes a physical direct link broadcast channel PSBCH, a primary direct link A link synchronization signal PSSS and a secondary direct link synchronization signal SSSS; wherein the indication information includes at least one of the following: load information of the PSBCH; a sequence of the demodulation reference signal DMRS of the PSBCH; the PSBCH , The power difference between the PSSS and at least two of the SSSS.
  • the indication information includes a power difference between at least two of the PSBCH, the PSSS, and the SSSS
  • the first value There is a mapping relationship with the power difference; wherein, the mapping relationship is configured by the network device; or, the mapping relationship is predefined; or, the mapping relationship is determined by a high-level of the first terminal device .
  • the first signal includes a physical direct link shared channel PSSCH, and the indication information is carried in the PSSCH; or, the first A signal includes a physical direct link control channel PSCCH, and the indication information is carried in the PSCCH; or, the first signal includes a physical direct link feedback channel PSFCH, and the indication information is carried in the PSFCH.
  • the first signal includes a reference signal
  • the indication information includes a sequence of the reference signal
  • the reference signal is used to determine the Channel state information between a terminal device and the second terminal device.
  • the transceiver is further configured to receive a second signal from the second terminal device; wherein, the transmission power of the second signal is based on An estimated path loss value between the first terminal device and the second terminal device is determined, and an estimated path loss value between the first terminal device and the second terminal device is based on the transmission of the first signal The power and the received power of the first signal are determined.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • the transmission power of the second signal is based on an estimated path loss value between the first terminal device and the second terminal device and the The estimated value of the path loss between the network device and the second terminal device is determined.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • an embodiment of the present application further provides a terminal device, the terminal device is used as a second terminal device, the second terminal device includes a processor, a memory, and a transceiver, and the processor and the memory Coupling, the processor is used to run instructions or programs in the memory, the transceiver is coupled to the processor, and the transceiver is used to receive a first signal and indication information from a first terminal device;
  • the indication information is used to indicate or include a first value, the first value is a value in a reference value set, the reference value set includes at least two power values, and the first value does not exceed the first power ,
  • the first power is determined according to the maximum transmission power of the first signal; the processor is configured to determine the first terminal device and the first terminal according to the indication information and the received power of the first signal Estimated path loss between two terminal devices.
  • the first value does not exceed a second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the processor is further configured to determine the second according to an estimated path loss value between the first terminal device and the second terminal device The transmit power of the signal; the transceiver is also used to send the second signal to the first terminal device with the transmit power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device a path loss between the estimated value
  • the target power PO_1 is a path loss compensation factor
  • f is the adjustment parameter.
  • the processor is specifically configured to estimate the path loss between the first terminal device and the second terminal device and the The estimated value of the path loss between the network device and the second terminal device determines the transmission power of the second signal.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is the road loss compensation factor.
  • the transmission power of the second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • the PLSL is the first terminal device and the second terminal device
  • the PLDL is the estimated path loss between the network device and the second terminal device
  • the PO_1 and the PO_2 are the target power
  • the ⁇ 1 and the ⁇ 2 is a road loss compensation factor
  • f is an adjustment parameter.
  • the first terminal device includes a terminal device with the largest path loss estimation value between the terminal device set and the second terminal device.
  • the terminal device set is a set of terminal devices that have established a connection with the second terminal device; or the terminal device set is a The second terminal device has established a connection and is a collection of terminal devices within a reference range from the second terminal device.
  • an embodiment of the present application provides a computer-readable storage medium, in which instructions are stored in a computer-readable storage medium, which when executed on a computer, causes the computer to execute the method described in the above aspects.
  • an embodiment of the present application provides a computer program product including instructions, which, when run on a computer, causes the computer to execute the methods described in the above aspects.
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • 2a is a schematic diagram of a transmission path provided by an embodiment of the present application.
  • 2b is a schematic diagram of another transmission path provided by an embodiment of the present application.
  • 2c is a schematic diagram of yet another transmission path provided by an embodiment of the present application.
  • 3a is a schematic diagram of a scenario of direct link communication provided by an embodiment of the present application.
  • 3b is a schematic diagram of another scenario of direct link communication provided by an embodiment of the present application.
  • 3c is a schematic diagram of another scenario of direct link communication provided by an embodiment of the present application.
  • 3d is a schematic diagram of yet another scenario of direct link communication provided by an embodiment of the present application.
  • 3e is a schematic diagram of another scenario of direct link communication provided by an embodiment of the present application.
  • FIG. 3f is a schematic diagram of another scenario of direct link communication provided by an embodiment of the present application.
  • 3g is a schematic diagram of another scenario of direct link communication provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a power control method provided by an embodiment of the present application.
  • 5a is a schematic structural diagram of an S-SSB provided by an embodiment of the present application.
  • 5b is a schematic structural diagram of another S-SSB provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a power control device according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of another power control device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • At least one (item) refers to one or more
  • “multiple” refers to two or more
  • “at least two (items)” refers to two or three And more than three
  • "and/or” used to describe the association relationship of associated objects, indicating that there can be three kinds of relationships, for example, "A and/or B” can mean: there is only A, only B and A And B three cases, where A, B can be singular or plural.
  • the character “/” generally indicates that the related object is a "or” relationship.
  • “At least one of the following” or a similar expression refers to any combination of these items, including any combination of a single item or a plurality of items.
  • At least one (a) of a, b or c can be expressed as: a, b, c, "a and b", “a and c", “b and c", or "a and b and c ", where a, b, c can be a single or multiple.
  • the communication system used in this application may be understood as a wireless cellular communication system, or a wireless communication system based on a cellular network architecture.
  • FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application, and the solution in the present application may be applied to the communication system.
  • the communication system may include at least one network device, only one of which is shown, as shown in the next generation base station (the next generation Node B, gNB); and one or more terminal devices connected to the network device, as shown in the figure Terminal device 1 and terminal device 2.
  • the network device may be a device that can communicate with the terminal device.
  • the network device may be any device with wireless transceiver function, including but not limited to a base station.
  • the base station may be gNB, or the base station may be a base station in a future communication system.
  • the network device may also be an access node, a wireless relay node, a wireless backhaul node, etc. in a wireless local area network (wireless fidelity, WiFi) system.
  • the network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the network device may also be a wearable device or a vehicle-mounted device.
  • the network device may also be a small station, a transmission reference (TRP), and so on.
  • TRP transmission reference
  • Terminal equipment may also be referred to as user equipment (UE), terminal, etc.
  • Terminal equipment is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed on the water, such as ships, etc.; it can also be deployed in the air, such as deployed in Airplanes, balloons or satellites are fine.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, industrial control (industrial control) ), wireless terminals in self-driving, self-driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety , Wireless terminals in smart cities (smart cities), wireless terminals in smart homes (smart homes), etc.
  • VR virtual reality
  • AR augmented reality
  • industrial control industrial control
  • Wireless terminals in self-driving self-driving
  • wireless terminals in remote medical wireless terminals in smart grid, wireless terminals in transportation safety , Wireless terminals in smart cities (smart cities), wireless terminals in smart homes (smart homes), etc.
  • the terminal device 1 and the terminal device 2 can also be carried out through device-to-device (D2D) technology or vehicle-to-everything (V2X) technology Communication.
  • D2D device-to-device
  • V2X vehicle-to-everything
  • FIG. 2a is A schematic diagram of a transmission path between a terminal device and a terminal device provided by an embodiment of the present application.
  • the terminal device 1 may first send data to an evolved NodeB (evolved NodeB, eNodeB) 1, and then the eNB1 sends the data to a core network (CN).
  • eNodeB evolved NodeB
  • CN core network
  • the CN may include, for example, a serving gateway ( serving gateway (SGW), PDN gateway (PDW gateway, PGW), and mobility management entity (mobility management entity, MME); after the CN receives the data, the CN sends the data to eNB2, which then receives the data ⁇ terminal ⁇ 2 ⁇ The data sent to the terminal 2.
  • SGW serving gateway
  • PDN gateway PDN gateway
  • MME mobility management entity
  • the transmission path shown in FIG. 2a is only an example.
  • the terminal device 1 and the terminal device 2 may belong to the same cell, etc., and the embodiment of the present application does not make the transmission path shown in FIG. 2a unique.
  • the new radio (NR) in the 5th-generation mobile communication technology (5th-generation, 5G) is a newly proposed topic in the 3rd generation partnership (3GPP) organization, which is located in the release 14.
  • 3GPP 3rd generation partnership
  • 4th-generation mobile communication technology (4th-generation, 4G) the LTE standard proposed by the 3GPP organization has been widely used all over the world and is called the 4th-generation mobile communication technology (4th-generation, 4G).
  • 4G 4th-generation mobile communication technology
  • TDD time division duplex
  • FDD frequency division duplex
  • the 3GPP specification introduces multiple technologies of Internet of Everything, NB-IOT technology, eMTC technology, etc. These are Internet of Things technologies, and 3GPP also introduces the Internet of Things.
  • end-to-end technology such as D2D.
  • D2D is an overview, and proximity service (proximity-based service, ProSe) is based on close-range services, which is a business name for implementing D2D technology in 3GPP.
  • the direct link (sidelink communication, SL) communication technology is a technology for implementing ProSe services.
  • vehicle-to-everything or vehicle-to-everything (V2X) is also a kind of IoT technology.
  • the transmission path may be as follows Shown in Figure 2b and Figure 2c.
  • data interaction can be performed directly between the terminal device 1 and the terminal device 2.
  • the terminal device 1 and the terminal device 2 may also perform data interaction through gNB only.
  • the base station shown in the figure is only an example, and should not be construed as limiting the present application.
  • a direct link (sidelink)
  • data can be directly transmitted between two terminal devices without first sending the data to the base station, forwarding it through the core network, and then sending it to the receiving terminal device.
  • This can greatly reduce the data delay, but due to the limited transmission power of the terminal equipment, the direct link is generally limited to short-distance communication.
  • D2D technology it can be applied to social applications based on proximity characteristics, such as data transmission between neighboring terminal devices such as content sharing and interactive games through D2D. It can also solve the problem of damage to the communication infrastructure caused by natural disasters, resulting in interruption of communication and obstacles to rescue.
  • wireless communication can still be established between two adjacent terminal devices.
  • information such as product discounts, theater announcements, etc. can also be pushed to the user based on D2D, and the embodiments of the present application do not uniquely limit the scenes applied by D2D.
  • FIG. 3a to FIG. 3g it is a schematic diagram of a scenario of direct link communication provided by embodiments of the present application. It can be understood that the figure takes the UE as an example to illustrate the direct link communication scenario, but it should not be understood as a limitation to the embodiments of the present application.
  • both terminal device 1 and terminal device 2 are outside the cell coverage.
  • the terminal device 1 is within the cell coverage, and the terminal device 2 is outside the cell coverage.
  • terminal device 1 and terminal device 2 are both within the coverage of the same cell, and are in a public land mobile network (PLMN), such as PLMN1.
  • PLMN public land mobile network
  • terminal device 1 and terminal device 2 are in the same PLMN as PLMN1, but are in different cell coverage areas.
  • terminal device 1 and terminal device 2 are in different PLMNs and different cells, respectively, and terminal device 1 and terminal device 2 are within the common coverage of two cells, respectively.
  • terminal device 1 is in PLMN1
  • terminal device 2 is in PLMN2.
  • terminal device 1 and terminal device 2 are respectively in different PLMNs and different cells, and terminal device 1 is within the common coverage of the two cells, and terminal device 2 is within the coverage of the serving cell.
  • the terminal device 1 and the terminal device 2 are respectively in different PLMNs and different cells, and the terminal device 1 and the terminal device 2 are within the coverage of their respective serving cells.
  • V2X vehicle-to-everything
  • V2X vehicle-to-everything
  • sidelink the direct link (sidelink) described in the embodiment of the present application may also be understood as a sidelink (sidelink), etc.
  • sidelink sidelink
  • the specific name of the sidelink is not uniquely defined in the embodiment of the present application.
  • the communication interface between the terminal device and the base station is called a UU interface
  • the communication interface between the terminal device and the terminal device is called a PC5 interface.
  • the following example introduces the uplink power control of the UU port in NR.
  • PUSCH physical uplink shared channel
  • the final transmit power is the smaller of the two items, the first of which is P CMAX,f,c (i), which can be expressed as the maximum transmit power of the PUSCH. Understandably, in some implementations, the maximum transmission power of the PUSCH can also be understood as the maximum transmission power of the terminal device.
  • the second term is a more complicated formula. Specifically, the whole formula is understood as follows: the terminal device should calculate the transmit power according to the formula of the second item, when the value calculated by the second formula exceeds the maximum transmit power of the terminal device (That is, the first formula), because the physical hardware of the terminal equipment is limited and the transmission power required by the second formula cannot be achieved, the terminal equipment can only transmit the signal with the maximum transmission power (that is, the first formula).
  • PO_PUSCH, f, c (j) is the target power of the PUSCH, which can be understood as the target power value of the PUSCH at the base station, that is, the power that the PUSCH can expect to reach when the PUSCH reaches the base station.
  • PL b, f, c (q d ) is estimated by the terminal device through the downlink signal sent by the base station.
  • the terminal device calculates the received power of the SSB according to a signal sent by the base station, such as a synchronization signal block (SSB).
  • the base station broadcasts the transmission power of the SSB in a physical broadcast channel (PBCH).
  • PBCH physical broadcast channel
  • the terminal device can obtain the estimated value of the downlink path loss between the base station and the terminal device by comparing the received power and the transmitted power of the SSB.
  • the terminal device can obtain uplink and downlink path loss estimates (such as the uplink path loss between the base station and the terminal device and the downlink path loss between the base station and the terminal device Roughly the same).
  • ⁇ b,f,c (j) ⁇ PL b,f,c (q d ) is the compensation value for path loss.
  • PL b,f,c (q d ) is the estimated value of path loss
  • ⁇ b,f,c (j) is the path loss compensation factor, when the value is 1, it means that the path loss is fully compensated.
  • the value of ⁇ b,f,c (j) can be configured by the base station.
  • P O_PUSCH,f,c (i)+ ⁇ b,f,c (j) ⁇ PL b,f,c (q d ) can be understood as path loss compensation for the target power after setting the target power of the base station , You can get the target transmit power of the terminal device.
  • the specific name of ⁇ is not limited in the embodiment of the present application.
  • P O_PUSCH,f,c (i)+ ⁇ b,f,c (j) ⁇ PL b,f,c (q d ) can be specifically understood as the target transmission power of a signal of unit bandwidth. It can be understood as the target transmission power of the signal of the entire PUSCH bandwidth. Further, the three-term sum can be called "open-loop power control", that is, the terminal device receives power through the target, estimates path loss and compensates, and determines the transmission power (that is, does not require feedback adjustment of the base station).
  • ⁇ TF, b, f, c (i) + f b, f, c (i) is the "closed-loop power adjustment" part.
  • ⁇ TF,b,f,c (i) can be expressed as the adjustment made by the terminal device for the current PUSCH transmission power. For example, the higher the modulation order adopted by the current PUSCH, the greater the transmission power required to ensure transmission reliability.
  • f b,f,c (i) is the “transmission power command” part of the base station directly adjusting the transmission power, and the base station directly indicates whether the current PUSCH transmission power needs to be increased or decreased through downlink control information (DCI) .
  • DCI downlink control information
  • the direct link transmission can also include the following channels: physical direct link shared channel (physical sidelink shared channel, PSSCH), physical direct link control channel (physical sidelink control channel, PSCCH ), physical direct link discovery channel (physical sidelink discovery channel, PSDCH).
  • PSSCH physical sidelink shared channel
  • PSCCH physical direct link control channel
  • PSDCH physical direct link discovery channel
  • P PSSCH min ⁇ P CMAX,PSSCH ,10log 10 (M PSSCH )+P O_PSSCH + ⁇ PSSCH ⁇ PL ⁇ (2)
  • P PSCCH min ⁇ P CMAX,PSCCH ,10log 10 (M PSCCH )+P O_PSCCH + ⁇ PSCCH ⁇ PL ⁇ (3)
  • P PSDCH min ⁇ P CMAX,PSDCH ,10log 10 (M PSDCH )+P O_PSDCH + ⁇ PSDCH ⁇ PL ⁇ (4)
  • PPSSCH is the transmission power of PSSCH
  • PPSCCH is the transmission power of PSCCH
  • PPSDCH is the transmission power of PSDCH
  • PCMAX PSSCH is the maximum transmission power of PSSCH
  • PCMAX PSCCH is the maximum transmission power of PSCCH
  • PCMAX PSDCH is the maximum of PSDCH Transmit power
  • MPSSCH is the bandwidth of PSSCH
  • MPSCCH is the bandwidth of PSCCH
  • MPSDCH is the bandwidth of PSDCH
  • PO_PSSCH is the target power of PSSCH
  • PO_PSCCH is the target power of PSCCH
  • PO_PSDCH is the target power of PSDCH
  • PL is between the base station and the terminal equipment Estimated path loss.
  • the PL is still the path loss estimate based on the downlink signal rather than the path loss estimate based on the direct link between the transmitting terminal device and the receiving terminal device value.
  • the reason is that, when designing the direct link of LTE, the hybrid automatic repeat request (HARQ) feedback is not supported at the physical layer, so the transmitting terminal device (or the sending end) can only be as large as possible.
  • the transmission power of the transmission signal to ensure the reliability of transmission.
  • the transmit power cannot be too large to avoid interference with the uplink signals of other terminal devices (for example, the base station is supposed to receive the uplink signals of other terminal devices, but the signal power of the transmitting terminal device in the direct link is too large for other terminals
  • the uplink signal of the device generates large interference, which causes the base station to fail to normally receive the uplink signal of the other terminal device). Therefore, the embodiment of the present application provides a power control method, that is, the transmission power of the terminal device in the direct link uses the path loss estimation between the transmission terminal device and the reception terminal device as a reference to determine the transmission power.
  • FIG. 4 is a schematic flowchart of a power control method provided by an embodiment of the present application.
  • the power control method can be applied to any scenario shown in FIGS. 3a to 3g, and the power control method can also be applied to the power control method shown in FIG. 1. Communication Systems.
  • the power control method includes:
  • the first terminal device determines the transmission power of the first signal according to the first value; wherein the first value is a value in a reference value set, the reference value set includes at least two power values, and the first value The first power is not exceeded, and the first power is determined according to the maximum transmission power of the first signal.
  • the reference value set may include at least two power values, and the power value may specifically be understood as the transmission power value of the signal. That is to say, the reference value set may include K optional power values, where K is an integer greater than or equal to 2. As an example, the reference value set may include a first value, a second value, a third value, and so on. The embodiment of the present application does not limit how many power values are specifically included in the reference value set.
  • the reference value set may be configured by a network device such as a base station, may also be predefined, or may be determined by a higher layer of the first terminal device.
  • the reference value set may be configured by the base station, so that both the first terminal device and the second terminal device can learn The reference value set.
  • the reference value set may be predefined. By predefining the reference value set, the first terminal device cannot be prevented from knowing the reference value set and the first signal cannot be determined. Transmit power.
  • the first terminal device can determine the reference value set through an application layer or a radio resource control (RRC) layer, etc., or if the first terminal device can also communicate with the second terminal through the application layer or RRC layer
  • RRC radio resource control
  • the first terminal device may select a first value from the K power selectable values, and the limiting condition of the first value includes that if the first power is not exceeded, the first power may be based on the maximum transmit power of the first signal determine. It can be understood that in some implementations, for example, when the terminal device only sends the first signal, the maximum transmit power of the first signal may also be understood as the maximum transmit power of the terminal device.
  • the maximum transmission power of the first terminal device may be understood as the maximum transmission power limited by the physical hardware of the first terminal device, or may also be understood as the maximum transmission power allowed by the hardware of the first terminal device. As an example, the maximum transmission power of the first terminal device may be calculated according to the high-level configuration parameters of the base station.
  • the limiting condition of the first value may further include if the second power is not exceeded, The second power is determined according to the estimated value of the path loss between the network device such as the base station and the first terminal device.
  • the first terminal device determines the first value from the K optional power values
  • the other values included in the K optional power values such as the second value or the third value and the first power
  • the relationship with the second power is not limited in the embodiments of the present application.
  • the first terminal device determines the power value that satisfies the first power and the second power from the K optional power values not only includes the first value, but also includes the second value.
  • the first terminal The device may randomly determine a value such as the first value from the first value and the second value. Or in this case, the first terminal device may also determine a larger value from the first value and the second value. If the first value is greater than the second value, the first value may be determined.
  • the first value determined by the first terminal device from the K power selectable values can satisfy both the first power and the second power, and the second value only satisfies the first power, but does not satisfy the second power. .
  • the first terminal device sends instruction information to a second terminal device, where the instruction information is used to indicate or include the first value; the second terminal device receives the instruction information from the first terminal device.
  • the indication information may be carried in different information according to different first signals. Alternatively, it may be understood that the indication information may be included in different information according to different first signals. In other words, the indication information may include different types of indication forms or indication manners.
  • the first terminal device sends the first signal to the second terminal device with the transmit power of the first signal; the second terminal device receives the first signal from the first terminal device.
  • the channel may also be understood as a signal, so in the embodiment of the present application, the first signal may include not only a certain signal but also a certain channel.
  • the first signal may further include physical direct link shared channel (physical sidelink shared channel, PSSCH), physical direct link control channel (physical sidelink control channel, PSCCH), and physical direct link feedback Channel (physical sidelink feedback channel, PSFCH) and so on.
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • PSFCH physical direct link feedback Channel
  • the second terminal device determines an estimated path loss value between the first terminal device and the second terminal device according to the instruction information and the received power of the first signal.
  • the second terminal device may obtain the transmission power of the first signal according to the first value indicated by the indication information.
  • the transmission power of the first signal may be the power value corresponding to the first value, or the transmission power of the first signal may also be the sum of the power value corresponding to the first value and the offset power value. Therefore, the second terminal device can obtain the path loss estimation value between the first terminal device and the second terminal device according to the transmission power of the first signal and the reception power of the first signal.
  • the second terminal device determines the transmission power of the second signal according to the estimated path loss between the first terminal device and the second terminal device.
  • the second signal may not only refer to a certain signal, but also refer to a certain channel.
  • the second signal reference may be made to the specific description of the first signal, and no more details will be given here.
  • the second terminal device sends the second signal to the first terminal device with the transmit power of the second signal; the first terminal device receives the second signal.
  • the first terminal device indicates the first value to the second terminal device, so that the second terminal device can obtain the estimated value of the path loss between the first terminal device and the second terminal device according to the first value, Therefore, the second terminal device effectively determines the transmission power of the second signal during direct link transmission, and improves the efficiency of interaction between the terminal devices, that is, the second terminal device uses the direct link to connect the terminal device and the terminal device
  • the estimated path loss between them is used as a reference to determine the transmission power of the second signal, which not only better determines the transmission power of the second signal, but also avoids interference with the uplink signals of other terminal devices (that is, the second signal does not exceed the base station
  • the estimated value of the path loss with the second terminal device ensures the reliability of signal transmission.
  • the first signal may include a direct link synchronization signal block (sidelink synchronization signal block, S-SSB).
  • S-SSB sidelink synchronization signal block
  • FIG. 5a is a schematic structural diagram of an S-SSB provided by an embodiment of the present application.
  • the S-SSB may include a direct link physical broadcast channel (physical sidelink broadcast channel, PSBCH), a direct link Primary synchronization signal (primary sidelink synchronization signal, PSSS) and direct link secondary synchronization signal (secondary sidelink synchronization signal, SSSS).
  • PSBCH physical sidelink broadcast channel
  • PSSS direct link Primary synchronization signal
  • SSSS secondary sidelink synchronization signal
  • the transmission power of the S-SSB may be determined according to the first value.
  • S-SSB occupies four orthogonal frequency division multiplexing (OFDM) symbols in the time domain. It can be seen from Figure 5a that PSSS and SSSS each occupy one OFDM symbol, while PSBCH occupies two OFDM symbols.
  • OFDM orthogonal frequency division multiplexing
  • the four OFDM symbols occupied by S-SSB can be divided into a first OFDM symbol and a second OFDM symbol Symbol, the third OFDM symbol and the fourth OFDM symbol, such as the OFDM symbol occupied by the PSSS can be called the first OFDM symbol, the OFDM symbol occupied by the SSSS can be called the second OFDM symbol, and the two OFDM symbols occupied by the PSBCH can be called respectively The third OFDM symbol and the fourth OFDM symbol.
  • the structure of the S-SSB shown in FIG. 5a is only an example.
  • the bandwidth relationship between the PSSS, PSBCH, and SSSS is not limited in this embodiment of the present application.
  • the bandwidth of the PSSS and SSSS may be the same. , Can also be different, etc.
  • the first value can be used to indicate the transmit power on the first OFDM symbol where the S-SSB is located.
  • the embodiments of the present application may determine whether the transmission power on the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol are the same To provide the following embodiments. Understandably, the transmission power on the third OFDM symbol and the fourth OFDM symbol may be considered to be the same.
  • the transmission power of the S-SSB may satisfy the following formula:
  • PS-SSB is the transmission power of S-SSB
  • P′ S-SSB is the first value.
  • the P′ S-SSB also satisfies the following formula:
  • P S-SSB, K is the Kth power selectable value.
  • PS-SSB, MAX is the maximum transmit power of S-SSB
  • the maximum transmit power of S-SSB can be understood as the maximum transmit power of the physical hardware of the first terminal device is limited, or, it can also be It is understood as the maximum transmit power allowed by the hardware of the first terminal device.
  • the maximum transmission power of the S-SSB can also be calculated by the first terminal device according to the parameters configured by the base station, etc. The embodiment of the present application does not limit the calculation method of the maximum transmission power of the S-SSB.
  • PS-SSB is the transmission power of S-SSB
  • P′ S-SSB is the first value
  • PO_SSSB, DL is the target received power of S-SSB, this value can be configured by the base station
  • PLDL is the base station and the first terminal equipment Estimated path loss between channels
  • ⁇ S-SSB, DL is the path loss compensation factor for S-SSB, which can be configured by the base station.
  • the transmission power may not be specified in units of S-SSB, but the transmission power of PSSS, SSSS, and PSBCH may be set separately. Therefore, the transmission power of PSSS, SSSS, and PSBCH can satisfy the following formulas:
  • PPSSS is the transmission power of PSSS
  • PSSSS is the transmission power of SSSS
  • PPSBCH is the transmission power of PSBCH
  • P′ S-SSB is the first value.
  • the P′ S-SSB not only satisfies formula (6), but also satisfies the following formula:
  • PPSSS, MAX, PSSSS, MAX, PPSBCH, MAX are the maximum transmit power of PSSS, SSSS and PSBCH respectively;
  • PO_PSSS, DL is the target received power of PSSS (ie target power), PO_SSSS, DL is the target received power of SSSS, PO_PSBCH, DL is the target received power of PSBCH.
  • PLDL is the estimated value of the path loss between the base station and the first terminal device, ⁇ PSSS, DL is the path loss compensation factor of PSSS, ⁇ SSSS, DL is the path loss compensation factor of SSSS, ⁇ PSBCH, DL is the PSBCH path loss compensation factor .
  • the path loss compensation factors of different signals or channels or the target received power are expressed as different parameters.
  • the path loss compensation factors of the PSSS, SSSS, and PSBCH may also be the same
  • the transmission power of the first signal, S-SSB is the power value corresponding to the first value, for example, the transmission power of the SSSB is equal to the power value corresponding to the first value.
  • the indication information sent by the first terminal device to the second terminal device may include at least one of the following:
  • the indication information can be determined not only by the load information of the PSBCH, but also by the sequence of the DMRS of the PSBCH.
  • the indication information may include load information of the PSBCH, that is, the first terminal device may indicate or include the first numerical value through the load information of the PSBCH.
  • the first terminal device may pass Bits to indicate the first value.
  • the indication information may further include the DMRS sequence of the PSBCH, that is, the first terminal device may also indicate the first value through the DMRS sequence of the PSBCH.
  • the K selectable sequences may correspond to K selectable power values, that is, each selectable sequence corresponds to each selectable power value in one-to-one relationship. Therefore, when the second terminal device receives the PSBCH, it may blindly detect K optional sequences, thereby determining the sequence of the DMRS, and then determining the first value.
  • the indication information may be included in the load information of the PSBCH or the sequence of the DMRS, that is, the first terminal device may also indicate the first value through the load information of the PSBCH and the sequence of the DMRS of the PSBCH.
  • 8 kinds of optional power values can be divided into 2 groups, and each group corresponds to a DMRS optional sequence.
  • 2bit information is used in the load information of the PSBCH to indicate one of the four selectable power values in each group.
  • the selectable values of the K powers are ⁇ 16dBm, 18dBm, 20dBm, 22dBm ⁇ , respectively, and the transmission power determined by the first terminal device is 20.31dBm.
  • the indication information may indicate a first value of 20 dBm (that is, the indication information may indicate 20 dBm through a 2-bit information amount), that is, the indication information is determined based on the value of the first value, and the first terminal device finally determines The transmit power of the S-SSB is 20dBm.
  • the first terminal device may also transmit S-SSB at 20.31 dBm, and the indication information may indicate 20.31 dBm through an information amount such as 10 bits, in which case 20.31 dBm is also one of K power selectable values , K is less than and equal to 1024 (that is, 2 to the 10th power).
  • the embodiments of the present application do not limit the above specific implementation.
  • the first terminal device can keep the transmission power within 4 OFDM symbols of the first terminal device transmitting S-SSB constant (that is, for the first terminal For equipment, the amplification factor of the power amplifier is easy to determine), thereby helping to ensure the stability of the transmission power of the first terminal device.
  • the transmission power of the S-SSB may satisfy the following formula:
  • A, B, and C represent offset power values, respectively, or may also be referred to as offset values.
  • A, B, and C may be predefined, or may be determined by the first terminal device.
  • the first signal that is, the transmission power of the S-SSB is the sum of the power value corresponding to the first value and the offset power value. Understandably, for the detailed description of the other parameters in formula (14) to formula (18), reference may be made to the detailed description of formula (9) to formula (13), which will not be elaborated here.
  • both the first terminal device and the second terminal device know the value.
  • the indication information can be indicated by the load information of the PSBCH, or by the DMRS sequence of the PSBCH, etc.
  • the load information of the PSBCH or by the DMRS sequence of the PSBCH, etc.
  • the first terminal device may indicate the first value by the power difference of at least two of PSBCH, PSSS, and SSSS. That is to say, in this case, the indication information can be indicated by the power difference of at least two of PSBCH, PSSS, and SSSS.
  • there is a mapping relationship between the first value and the power difference that is, there is a one-to-one correspondence between the first value and the power difference.
  • the mapping relationship may be configured by the base station, or is predefined, or determined by a higher layer of the first terminal device.
  • the first terminal device may indicate the first value through the power difference between PSSS, SSSS, and PSBCH.
  • the selectable values of the PSSS transmit power are 14dBm, 16dBm, 18dBm and 20dBm.
  • the selectable values of the PSSS transmit power are 14dBm, 16dBm, 18dBm and 20dBm.
  • the first terminal device may also indicate the first value through the load information of the PSBCH and the DMRS sequence of the PSBCH.
  • the first terminal device can express the information amount of 1 bit by the difference between the transmission power of the PSBCH and the transmission power of the PSSS (the two are equal or the former is better than the latter 3dB higher), the remaining 2 bits can be indicated by the load information of the PSBCH and/or the DMRS sequence using the PSBCH.
  • the transmission power of the S-SSB may also satisfy the following formula:
  • MPSSS is the bandwidth of PSSS
  • MSSSS is the bandwidth of PSSS
  • MPSBCH is the bandwidth of PSBCH
  • MS-SSB is the bandwidth of S-SSB
  • MPSSS may be specifically understood as the number of resource blocks (resources, RBs) or resource elements (REs) occupied by PSSS on frequency domain resources
  • MSSSS may be understood as SSSSs in the frequency domain
  • the number of occupied RBs or REs and the MPSBCH can be understood as the number of occupied RBs or REs in the frequency domain by the PSBCH.
  • This embodiment can be understood as that the transmission power of each resource block (RB) or each resource element (RE) occupied by the PSSS, SSSS, and PSBCH contained in the S-SSB is the same.
  • the indication manner of the indication information may refer to the foregoing embodiment, and details are not described here one by one.
  • it can be indicated by the load information of the PSBCH, or by the DMRS sequence of the PSBCH, and so on.
  • the indication information may include one or more items in the load information of the PSBCH and the DMRS sequence of the PSBCH.
  • the first value may also represent the transmit power on the first RE or the first RB of the first OFDM symbol where the S-SSB is located.
  • the RE or RB of the first OFDM symbol where the S-SSB is located may not only include the first RE or the first RB, but may also include the second RE or the second RB, etc. Therefore, as shown in this embodiment
  • the first RE or the first RB is just an example, and should not be construed as limiting the present embodiment.
  • the embodiments of the present application may also be based on the first OFDM symbol, the second OFDM symbol and the first Whether the transmission power on the three OFDM symbols is the same, provides the following embodiments.
  • the transmission power of the S-SSB may satisfy the following formula:
  • PS-SSB is the transmission power of S-SSB
  • P′ S-SSB is the first value
  • MS-SSB is the bandwidth of S-SSB
  • PS-SSB and MAX are the maximum transmission power of S-SSB
  • PO_S-SSB is the target received power of one RB or one RE
  • ⁇ S-SSB, DL is the path loss compensation factor of S-SSB.
  • the value of ⁇ in formula (24) and formula (25) may be determined according to the subcarrier interval.
  • the MS-SSB can be understood as the number of RBs or REs occupied by the S-SSB in the frequency domain.
  • the transmission power may not be specified in units of S-SSB, but the transmission power of PSSS, SSSS, and PSBCH may be set separately. Therefore, the transmission power of PSSS, SSSS, and PSBCH can satisfy the following formulas:
  • P PSBCH 10log 10 (2 ⁇ ⁇ M S-SSB )+P′ S-SSB (29)
  • the first value represents the transmission power on the RE or RB
  • the first value can be understood as the granularity of the RE or RB to determine the transmission power of the S-SSB Reference.
  • the power value on each RE or RB is For SSSS
  • the power value on each RE or RB is For PSBCH
  • the power value on each RE or RB is
  • the first signal that is, the transmission power of the S-SSB is the power value corresponding to the first value.
  • the indication information may include one or more items in the load information of the PSBCH and the DMRS sequence of the PSBCH.
  • the transmission power of the S-SSB may satisfy the following formula:
  • P PSBCH 10log 10 (2 ⁇ ⁇ M S-SSB )+P′ S-SSB +C (34)
  • A, B, and C respectively represent offset power values, or may also be referred to as offset values.
  • A, B, and C may be predefined, or may be determined by the first terminal device.
  • the first signal that is, the transmission power of the S-SSB is the sum of the power value corresponding to the first value and the offset power value.
  • the indication information may include one or more of the load information of the PSBCH and the DMRS sequence of the PSBCH.
  • the indication information may include the power difference between at least two of PSBCH, PSSS, and SSSS.
  • P′ S-SSB does not represent the power value of each signal or channel (such as PSBCH, PSSS, SSSS) on each RE or RB, but represents the reference value for determining the transmission power. It can be understood that, for a detailed description of each parameter, reference may be made to the foregoing embodiment, and no detailed description is given here.
  • the transmission power of the S-SSB may also satisfy the following formula:
  • P PSBCH P′ S-SSB +10log 10 (2 ⁇ ⁇ M PSBCH ) (39)
  • the transmission power of each RB or RE on the four symbols occupied by the S-SSB is the same.
  • the transmission power of the first signal, S-SSB is the power value corresponding to the first value.
  • the indication information may include one or more items in the load information of the PSBCH and the DMRS sequence of the PSBCH. For a detailed description of the indication information, reference may be made to the foregoing embodiment, and no more details are given here.
  • FIG. 5b is another S-SSB provided by the embodiments of the present application.
  • the S-SSB can occupy four OFDM symbols in the time domain.
  • SSSS and PSBCH occupy one OFDM symbol at the same time.
  • the OFDM symbol occupied by the S-SSB may also be divided into a first OFDM symbol, a second OFDM symbol, a third OFDM symbol, and a fourth OFDM symbol.
  • the OFDM symbol occupied by the PSSS may be called the first The OFDM symbol, the OFDM symbol occupied by the SSSS and the PSBCH(2) may be called a second OFDM symbol, and the two OFDM symbols occupied by the PSBCH(1) may be called a third OFDM symbol and a fourth OFDM symbol, respectively.
  • the structure of the S-SSB shown in FIG. 5b is only an example.
  • the bandwidth relationship between PSSS, PSBCH, and SSSS is not limited in the embodiments of the present application.
  • the bandwidth of PSSS and SSSS may be the same. It can also be different.
  • the first value can be used to indicate the transmit power on the first OFDM symbol where the S-SSB is located.
  • the embodiments of the present application may determine whether the transmission power on the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol are the same To provide the following embodiments.
  • the transmission power of the S-SSB may satisfy the following formula:
  • PPSSS is the transmission power of PSSS
  • PSSSS is the transmission power of SSSS
  • PPSBCH(1) is the transmission power of PSBCH(1)
  • PPSBCH(2) is the transmission power of PSBCH(2)
  • P′ S-SSB is the first Numerical value
  • MPSSS is the bandwidth of PSSS
  • MSSSS is the bandwidth of PSSS
  • MPSBCH is the bandwidth of PSBCH.
  • the first signal that is, the transmission power of the S-SSB is the power value corresponding to the first value.
  • SSSS and PSBCH (2) occupy the same OFDM symbol at the same time. Therefore, when the first terminal device needs to ensure that the transmission power of each OFDM symbol is the same, it is necessary to perform power conversion on the SSSS and PSBCH on the same OFDM symbol, and then determine the respective transmission power.
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (12) and formula (13).
  • the indication information sent by the first terminal device to the second terminal device may include at least one of the following:
  • the transmission power of the SSSB may satisfy the following formula:
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (17) and formula (18).
  • A, B, and C represent offset power values, respectively, or may also be referred to as offset values.
  • A, B, and C may be predefined, or may be determined by the first terminal device. It can be understood that in this embodiment, the first signal, that is, the transmission power of the SSSB is the sum of the power value corresponding to the first value and the offset power value.
  • the indication information may be indicated by the load information of the PSBCH, or by the DMRS sequence of the PSBCH, etc.
  • the load information of the PSBCH or by the DMRS sequence of the PSBCH, etc.
  • the first terminal device may indicate the first value by the power difference of at least two of PSBCH, PSSS, and SSSS. That is to say, in this case, the indication information can be indicated by the power difference of at least two of PSBCH, PSSS, and SSSS.
  • the transmission power of the S-SSB may also satisfy the following formula:
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (22) and formula (23).
  • each resource block (RB) or each resource element (RE) occupied by the PSSS, SSSS, and PSBCH contained in the SSSB can be understood to be the same.
  • the first value may also represent the transmit power on the first RE or the first RB of the first OFDM symbol where the SSSB is located.
  • the RE or RB of the first OFDM symbol where the S-SSB is located may not only include the first RE or the first RB, but may also include the second RE or the second RB, etc. Therefore, as shown in this embodiment
  • the first RE or the first RB is just an example, and should not be construed as limiting the present embodiment.
  • the embodiments of the present application may also be based on the first OFDM symbol, the second OFDM symbol and the third OFDM Whether the transmission powers on the symbols are the same, the following embodiments are provided.
  • the transmission power of the S-SSB may satisfy the following formula:
  • P PSBCH(1) 10log 10 (2 ⁇ ⁇ M S-SSB )+P′ S-SSB (55)
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (30) and formula (31).
  • the first signal that is, the transmission power of the S-SSB is the power value corresponding to the first value.
  • the indication information may include one or more items in the load information of the PSBCH and the DMRS sequence of the PSBCH.
  • the transmission power of the S-SSB may satisfy the following formula:
  • P PSBCH(1) 10log 10 (2 ⁇ ⁇ M S-SSB )+P′ S-SSB +B (59)
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (35) and formula (36).
  • the transmission power of the S-SSB may also satisfy the following formula:
  • P PSBCH(1) P′ S-SSB +10log 10 (2 ⁇ ⁇ M PSBCH ) (63)
  • P′ S-SSB not only satisfies formula (6), but also satisfies formula (40) and formula (41).
  • the first terminal device determines the transmission power of the S-SSB according to the above specific embodiment, it can send the S-SSB and the indication information to the second terminal device according to the transmission power of the S-SSB, the second terminal After receiving the S-SSB and the indication information, the device may determine the estimated value of the path loss between the first terminal device and the second terminal device. Specifically, after the second terminal device determines the estimated path loss PLSL between the first terminal device and the second terminal device, the second terminal device can send a second signal to the first terminal device according to the PLSL. Next, a method of determining the transmission power of the second signal by the second terminal device is described in detail.
  • the second signal may include a physical direct link shared channel (PSSCH).
  • PSSCH physical direct link shared channel
  • P PSSCH min[P PSSCH,MAX ,10log 10 (2 ⁇ ⁇ M PSSCH )+P O_PSSCH,1 + ⁇ PSSCH,1 ⁇ PL SL ] (66)
  • PPSSCH is the transmission power of PSSCH
  • PPSSCH MAX is the maximum transmission power of PSSCH
  • MPSSCH is the bandwidth of PSSCH
  • PO_PSSCH 1 is the target received power of PSSCH, the value can be configured by the base station, or the value can be predefined, Or it can also be indicated by high-level negotiation
  • ⁇ PSSCH, 1 is the path loss compensation factor, which can be configured by the base station, or the value can be predefined, or can also be indicated by high-level negotiation
  • PLSL is the first terminal device and the second Estimated path loss between terminal devices.
  • the transmission power of the PSSCH can also satisfy the following formula:
  • PO_PSSCH, 1 is the target received power of PSSCH, this value can be configured by the base station, can also be indicated by high-level negotiation, or can be predefined; ⁇ PSSCH, 1 is the path loss factor, this value can be configured by the base station, It may also be indicated by high-level negotiation or may be predefined; PLSL is an estimated value of the path loss between the first terminal device and the second terminal device.
  • PO_PSSCH, 2 is the target received power of PSSCH, this value can be configured by the base station; ⁇ PSSCH, 2 is the path loss factor, this value can be configured by the base station; PLDL is the estimated value of the path loss between the base station and the second terminal device.
  • the transmit power of the PSCCH is determined by formula (67), and the transmit power of the PSCCH can also be constrained to avoid interference with the uplink signal and ensure the reliability of transmission.
  • the transmission power of the PSSCH can also satisfy the following formula:
  • P PSSCH min(P PSSCH,MAX ,10log 10 (2 ⁇ ⁇ M PSSCH )+P O_PSSCH,1 + ⁇ PSSCH,1 ⁇ PL SL +f PSSCH ) (68)
  • f PSSCH is an adjustment parameter, which may be indicated by the base station through DCI, or may be indicated by the second terminal device, and so on. Understandably, this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • the transmission power of the PSSCH can also satisfy the following formula:
  • not only closed-loop power control is used to determine the transmission power of the second signal, but also the transmission power of the second signal can be determined according to the estimated path loss between the base station and the second terminal device to further determine the second
  • the transmit power of the signal is not only determined by the estimated path loss between the directly connected links, but also avoids interference with the upstream signal and ensures the reliability of signal transmission.
  • the second signal may further include a physical direct link control channel (PSCCH).
  • PSCCH physical direct link control channel
  • the transmission power of the PSCCH can satisfy the following formula:
  • P PSCCH min(P PSCCH,MAX ,10log 10 (2 ⁇ ⁇ M PSCCH )+P O_PSCCH,1 + ⁇ PSCCH,1 ⁇ PL SL ) (70)
  • PPSCCH is the transmission power of PSCCH
  • PPSCCH MAX is the maximum transmission power of PSCCH
  • MPSCCH is the bandwidth of PSCCH
  • PO_PSCCH, 1 is the target received power of PSCCH, the value can be configured by the base station, or the value can be predefined, Or it can also be indicated by high-level negotiation
  • ⁇ PSCCH, 1 is the path loss compensation factor, the value can be configured by the base station, or the value can be predefined, or can also be indicated by high-level negotiation
  • PLSL is the first terminal device and the second Estimated path loss between terminal devices.
  • the transmission power of the PSCCH can also satisfy the following formula:
  • PO_PSCCH, 1 is the target received power of PSCCH, this value can be configured by the base station, can also be indicated by high-level negotiation, or can be predefined; ⁇ PSCCH, 1 is the path loss factor, this value can be configured by the base station, It may also be indicated by high-level negotiation or may be predefined; PLSL is an estimated value of the path loss between the first terminal device and the second terminal device.
  • PO_PSCCH, 2 is the target received power of PSCCH, this value can be configured by the base station; ⁇ PSCCH, 2 is the path loss factor, this value can be configured by the base station; PLDL is the estimated value of the path loss between the base station and the second terminal device.
  • the transmission power of the PSCCH can also satisfy the following formula:
  • P PSCCH min(P PSCCH,MAX ,10log 10 (2 ⁇ ⁇ M PSCCH )+P O_PSCCH,1 + ⁇ PSCCH,1 ⁇ PL SL +f PSCCH ) (72)
  • f PSCCH is an adjustment parameter, which may be indicated by the base station through DCI, or may be indicated by the second terminal device, and so on. Understandably, this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • the transmission power of the PSCCH can also satisfy the following formula:
  • the second signal may further include a physical direct link feedback channel (physical sidelink feedback channel, PSFCH).
  • PSFCH physical sidelink feedback channel
  • P PSFCH min(P PSFCH,MAX ,10log 10 (2 ⁇ ⁇ M PSFCH )+P O_PSFCH,1 + ⁇ PSFCH,1 ⁇ PL SL ) (74)
  • PPSFCH is the transmission power of PSFCH
  • PPSFCH MAX is the maximum transmission power of PSFCH
  • MPSFCH is the bandwidth of PSFCH
  • PO_PSFCH, 1 is the target received power of PSFCH, this value can be configured by the base station, or this value can be predefined, Or it can also be indicated by high-level negotiation
  • ⁇ PSFCH, 1 is the path loss compensation factor, this value can be configured by the base station, or this value can be predefined, or it can also be indicated by high-level negotiation
  • PLSL is the first terminal device and the second Estimated path loss between terminal devices.
  • the transmission power of the PSFCH can also satisfy the following formula:
  • PO_PSFCH, 1 is the target received power of PSFCH, this value can be configured by the base station, can also be indicated by high-level negotiation, or can be predefined; ⁇ PSFCH, 1 is the path loss factor, this value can be configured by the base station, It may also be indicated by high-level negotiation or may be predefined; PLSL is an estimated value of the path loss between the first terminal device and the second terminal device.
  • PO_PSFCH, 2 is the target received power of PSFCH, this value can be configured by the base station; ⁇ PSFCH, 2 is the path loss factor, this value can be configured by the base station; PLDL is the estimated value of the path loss between the base station and the second terminal device.
  • the transmission power of the PSFCH can also satisfy the following formula:
  • P PSFCH min(P PSFCH,MAX ,10log 10 (2 ⁇ ⁇ M PSFCH )+P O_PSFCH,1 + ⁇ PSFCH,1 ⁇ PL SL +f PSFCH ) (76)
  • f PSFCH is an adjustment parameter, which may be indicated by the base station through DCI, or may be indicated by the second terminal device, and so on. Understandably, this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • the transmission power of the PSFCH can also satisfy the following formula:
  • the second signal may further include a physical direct link discovery channel (physical side link discovery channel, PSDCH).
  • PSDCH physical side link discovery channel
  • the transmission power of the PSDCH can satisfy the following formula:
  • P PSDCH min(P PSDCH,MAX ,10log 10 (2 ⁇ ⁇ M PSDCH )+P O_PSDCH,1 + ⁇ PSDCH,1 ⁇ PL SL ) (78)
  • PPSDCH is the transmission power of PSDCH
  • PPSDCH MAX is the maximum transmission power of PSDCH
  • MPSDCH is the bandwidth of PSDCH
  • PO_PSDCH 1 is the target received power of PSDCH, this value can be configured by the base station, or this value can be predefined, Or it can also be indicated by high-level negotiation
  • ⁇ PSDCH, 1 is the path loss compensation factor, the value can be configured by the base station, or the value can be predefined, or can also be indicated by high-level negotiation
  • PLSL is the first terminal device and the second Estimated path loss between terminal devices.
  • the transmission power of the PSDCH can also satisfy the following formula:
  • PO_PSDCH, 2 is the target received power of PSDCH, this value can be configured by the base station; ⁇ PSDCH, 2 is the path loss factor, this value can be configured by the base station; PLDL is the estimated value of the path loss between the base station and the second terminal device.
  • the transmission power of the PSDCH can also satisfy the following formula:
  • P PSDCH min(P PSDCH,MAX ,10log 10 (2 ⁇ ⁇ M PSDCH )+P O_PSDCH,1 + ⁇ PSDCH,1 ⁇ PL SL +f PSDCH ) (80)
  • f PSDCH is an adjustment parameter, which may be indicated by the base station through DCI, or may be indicated by the second terminal device, and so on. Understandably, this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • the transmission power of the PSDCH can also satisfy the following formula:
  • the second signal may further include a physical direct link channel state reference signal (sidelink channel state information reference signal (S-CSI-RS).
  • S-CSI-RS sidelink channel state information reference signal
  • the transmission power of the PSDCH can satisfy the following formula:
  • P S-CSI-RS min(P S-CSI-RS,MAX ,10log 10 (2 ⁇ ⁇ M S-CSI-RS )+P O_S-CSI-RS,1 + ⁇ S-CSI-RS,1 ⁇ PL SL ) (82)
  • PS-CSI-RS is the transmission power of S-CSI-RS
  • PS-CSI-RS, MAX is the maximum transmission power of S-CSI-RS
  • MS-CSI-RS is the bandwidth of S-CSI-RS
  • PO_S -CSI-RS,1 is the target received power of S-CSI-RS, this value can be configured by the base station, or this value can be predefined, or can also be indicated by high-level negotiation
  • ⁇ S-CSI-RS,1 is the path Loss compensation factor, the value can be configured by the base station, or the value can be predefined, or can also be indicated by high-level negotiation
  • PLSL is the estimated value of the path loss between the first terminal device and the second terminal device.
  • the transmission power of S-CSI-RS can also satisfy the following formula:
  • P S-CSI-RS min(P S-CSI-RS,MAX ,10log 10 (2 ⁇ ⁇ M S-CSI-RS )+P O_S-CSI-RS,1 + ⁇ S-CSI-RS,1 ⁇ PL SL ,
  • PO_S-CSI-RS, 1 is the target received power of S-CSI-RS, this value can be configured by the base station, it can also be indicated by high-level negotiation, or it can also be predefined;
  • ⁇ S- CSI-RS RS,1 is a path loss factor. This value can be configured by the base station, can also be indicated by high-level negotiation, or can be predefined;
  • PLSL is the estimated value of the path loss between the first terminal device and the second terminal device.
  • PO_S-CSI-RS 2 is the target received power of S-CSI-RS, this value can be configured by the base station; ⁇ S-CSI-RS, 2 is the path loss factor, this value can be configured by the base station; PLDL is the base station and the first Estimated path loss between two terminal devices.
  • the transmission power of S-CSI-RS can also satisfy the following formula:
  • P S-CSI-RS min(P S-CSI-RS,MAX ,10log 10 (2 ⁇ ⁇ M S-CSI-RS )+P O_S-CSI-RS,1 + ⁇ S-CSI-RS,1 ⁇ PL SL +f S-CSI-R S )(84)
  • f S-CSI-RS is an adjustment parameter, which may be indicated by the base station through DCI, or may be indicated by the second terminal device, and so on. Understandably, this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • this embodiment uses closed-loop power control to determine the transmission power of the second signal.
  • the transmission power of S-CSI-RS can also satisfy the following formula:
  • the second terminal device After the second terminal device determines the transmission power of the second signal according to the transmission power of the above signals, the second signal can be sent to the first terminal device.
  • the power control method provided by the embodiments of the present application described above is the case where the first signal is the S-SSB as an example. That is, the power control method shown above takes the first signal including S-SSB as an example, how the first terminal device sends indication information and the first signal to the second terminal device, and the second signal includes PSSCH, PSCCH, PSFCH, Taking PSDCH and S-CSI-RS as examples, how the second terminal device sends the second signal to the first terminal device.
  • the first signal may also include other signals.
  • the first signal may also include PSSCH.
  • the indication information may include the DMRS sequence of PSSCH. That is, the first value can be indicated by the DMRS sequence of PSSCH. Therefore, after receiving the PSSCH, the second terminal device determines the path loss estimation value between the first terminal device and the second terminal device according to the transmission power and the reception power of the PSSCH. Then, the second terminal device can determine the transmission power of the second signal according to the estimated value of the path loss between the first terminal device and the second terminal device.
  • the formula or condition satisfied by the transmission power of the second signal can refer to the foregoing embodiment, and will not be elaborated one by one here.
  • the first signal may also include PSCCH.
  • the indication information may include the DMRS sequence of the PSCCH. That is, the first value can be indicated by the DMRS sequence of PSCCH. Therefore, after receiving the PSCCH, the second terminal device determines the path loss estimation value between the first terminal device and the second terminal device according to the transmission power and the reception power of the PSCCH. Then, the second terminal device can determine the transmission power of the second signal according to the estimated value of the path loss between the first terminal device and the second terminal device.
  • the formula or condition satisfied by the transmission power of the second signal can refer to the foregoing embodiment, and will not be elaborated one by one here.
  • the first signal may also include PSFCH.
  • the indication information may include the DMRS sequence of the PSFCH. That is, the first value can be indicated by the DMRS sequence of PSFCH. Therefore, after receiving the PSFCH, the second terminal device determines the path loss estimation value between the first terminal device and the second terminal device according to the transmission power and the reception power of the PSFCH. Then, the second terminal device can determine the transmission power of the second signal according to the estimated value of the path loss between the first terminal device and the second terminal device.
  • the formula or condition satisfied by the transmission power of the second signal can refer to the foregoing embodiment, and will not be elaborated one by one here.
  • the first signal may also include C-SCI-RS. Since the S-CSI-RS itself is a reference signal, unlike other channels that can carry indication information, it can be indicated by the sequence used by the S-CSI-RS.
  • S-CSI-RS has four optional sequences, and each sequence can represent a transmission power. That is to say, the four selectable sequences of S-CSI-RS can correspond one-to-one to K (ie, 4) selectable power values.
  • the first terminal device may also indicate the transmission power of the S-CSI-RS through high-layer signaling (such as RRC signaling or MAC CE signaling). However, because the delay generated by each transmission of the high-layer signaling is relatively large, this situation The transmission power of the lower S-CSI-RS may not be dynamically changed, but semi-static.
  • the embodiments shown above are all shown in the case of unicast, that is, in the case where a first terminal device sends a first signal to a second terminal device.
  • there may be multiple terminal devices sending the first signal to the second terminal device that is, the terminal devices in the terminal device set send the first signal to the second terminal device.
  • the first The two terminal devices may separately determine the path loss estimation value between each terminal device in the terminal device set and the second terminal device to obtain a path loss estimation value set.
  • the second terminal device may determine the maximum path loss estimation value from the path loss estimation value set, so as to determine the transmission power of the second signal according to the maximum path loss estimation value.
  • the terminal device set may be understood as a terminal device in a multicast set or a terminal device in a multicast set.
  • the terminal device set may be understood as a set of terminal devices that have established a connection with the second terminal device.
  • the transmission power of the second signal is determined according to the maximum path loss estimation value, it can effectively ensure that each terminal device in the terminal device set can receive the second signal, ensuring reliable signal transmission Sex.
  • the terminal device set may also be understood as a set of terminal devices in a multicast set, and the distance from the second terminal device is within a reference range.
  • the terminal device set may be understood as a set of terminal devices that have established a connection with the second terminal device, and the distance between the terminal device and the second terminal device in the terminal device set is within a reference range.
  • the reference range may be configured by the base station, or is predefined, or determined by a higher layer, etc.
  • the embodiment of the present application does not limit the range specifically included in the reference range.
  • the power control method provided by the embodiment of the present application is shown above. Next, the power control device in the embodiment of the present application will be described in detail.
  • the device may be used to perform the method described in the embodiment of the present application.
  • the device may be a terminal device (Such as the first terminal device or the second terminal device), or a component in the terminal device that implements the above-mentioned functions, or a chip.
  • the power control device will be described below by taking terminal equipment as an example.
  • FIG. 6 is a schematic structural diagram of a power control device provided by an embodiment of the present application.
  • the power control device may be used as a first terminal device, and the power control device may be used to perform the method described in the embodiment of the present application
  • the power control device includes:
  • the processing unit 601 is configured to determine the transmission power of the first signal according to the first value; wherein the first value is a value in a reference value set, the reference value set includes at least two power values, and the first value Does not exceed the first power, the first power is determined according to the maximum transmit power of the first signal;
  • the sending unit 602 is used to send instruction information to the second terminal device, where the instruction information is used to indicate or include the first numerical value; the sending unit is also used to send the second terminal device with the transmit power of the first signal The above-mentioned first signal.
  • the first terminal device indicates the first value to the second terminal device, so that the second terminal device can obtain the estimated value of the path loss between the first terminal device and the second terminal device according to the first value, Therefore, the second terminal device effectively determines the transmission power of the signal during direct link transmission, and the reliability of signal transmission between the terminal devices is improved.
  • the first value does not exceed the second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • the reference value set is configured by the network device; or, the reference value set is predefined; or, the reference value set is determined by a higher layer of the first terminal device.
  • the above-mentioned first value is used to represent the transmission power on the first orthogonal frequency division multiplexing OFDM symbol where the above-mentioned first signal is located; or, the above-mentioned first value is used to represent the first OFDM where the above-mentioned first signal is located The transmission power on the first resource element RE of the symbol; or, the first numerical value is used to indicate the transmission power on the first resource block RB of the first OFDM symbol where the first signal is located.
  • the transmission power of the first signal is the power value corresponding to the first value; or, the transmission power of the first signal is the sum of the power value corresponding to the first value and the offset power value.
  • the offset power value is predefined, or the offset power value is determined by the first terminal device.
  • the first signal includes a direct link synchronization signal block SSSB
  • the SSSB includes a physical direct link broadcast channel PSBCH, a primary direct link synchronization signal PSSS, and an auxiliary direct link synchronization signal SSSS
  • the instruction information includes at least one of the following: the load information of the PSBCH; the sequence of the demodulation reference signal DMRS of the PSBCH; the power difference of at least two of the PSBCH, the PSSS, and the SSSS.
  • the first value has a mapping relationship with the power difference; wherein, the mapping relationship is configured by the network device Or, the above mapping relationship is predefined; or, the above mapping relationship is determined by the upper layer of the first terminal device.
  • the first signal includes a physical direct link shared channel PSSCH, and the indication information is carried in the PSSCH; or, the first signal includes a physical direct link control channel PSCCH, and the indication information is carried in In the aforementioned PSCCH; or, the aforementioned first signal includes a physical direct link feedback channel PSFCH, and the aforementioned indication information is carried in the aforementioned PSFCH.
  • the first signal includes a reference signal
  • the indication information includes a sequence of the reference signal.
  • the reference signal is used to determine channel state information between the first terminal device and the second terminal device.
  • the above power control device further includes:
  • the receiving unit 603 is configured to receive a second signal from the second terminal device; wherein, the transmission power of the second signal is determined according to an estimated value of the path loss between the first terminal device and the second terminal device.
  • the estimated path loss between a terminal device and the second terminal device is determined according to the transmission power of the first signal and the reception power of the first signal.
  • the sending unit 602 and the receiving unit 603 may be integrated into one device, for example, the sending unit 602 and the receiving unit 603 may be transceivers.
  • the sending unit 602 and the receiving unit 603 may also be separated into different devices, and the specific manner of the sending unit 602 and the receiving unit 603 is not limited in this application.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device
  • the above PO_1 is the target power
  • the above ⁇ 1 is the path loss compensation factor
  • the above f is the adjustment parameter.
  • the transmission power of the second signal is determined according to an estimated path loss value between the first terminal device and the second terminal device and an estimated path loss value between the network device and the second terminal device.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device
  • the PLDL is an estimated path loss value between the network device and the second terminal device
  • the PO_1 and the PO_2 are target powers
  • the ⁇ 1 and the ⁇ 2 are path loss compensation factors.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device the PLDL path loss between the network device and the second terminal apparatus estimates the above PO_2 PO_1 target power
  • f is the above-mentioned adjustment parameter.
  • the processing unit 601 may be one or more processors, the sending unit 602 may be a transmitter, and the receiving unit 603 may be a receiver The transmitter, or the sending unit 602 and the receiving unit 603 are integrated into one device, such as a transceiver.
  • the processing unit 601 may be one or more processors, the sending unit 602 may be an output interface, the receiving unit 603 may be an input interface, or the sending unit 602 and the receiving unit 603 are integrated into one unit, For example, input and output interfaces.
  • FIG. 7 is a schematic structural diagram of another power control device provided by an embodiment of the present application.
  • the power control device may be used as a second terminal device, and the power control device may be used to perform the description of the embodiment of the present application.
  • the power control device includes:
  • the receiving unit 701 is configured to receive a first signal and indication information from a first terminal device; wherein the indication information is used to indicate or include a first value, the first value is a value in a reference value set, and the reference value The set includes at least two power values, and the first value does not exceed the first power, and the first power is determined according to the maximum transmit power of the first signal;
  • the processing unit 702 is configured to determine an estimated path loss value between the first terminal device and the second terminal device according to the instruction information and the received power of the first signal.
  • the first value does not exceed the second power
  • the second power is determined according to an estimated path loss value between the network device and the first terminal device.
  • processing unit 702 is further configured to determine the transmission power of the second signal according to the estimated path loss between the first terminal device and the second terminal device;
  • the above power control device further includes:
  • the sending unit 703 is configured to send the second signal to the first terminal device with the transmit power of the second signal.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device
  • the above PO_1 is the target power
  • the above ⁇ 1 is the path loss compensation factor
  • the above f is the adjustment parameter.
  • the processing unit 702 is specifically configured to determine the above based on the estimated path loss between the first terminal device and the second terminal device and the estimated path loss between the network device and the second terminal device The transmit power of the second signal.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device
  • the PLDL is an estimated path loss value between the network device and the second terminal device
  • the PO_1 and the PO_2 are target powers
  • the ⁇ 1 and the ⁇ 2 are path loss compensation factors.
  • the transmission power of the above second signal satisfies the following formula:
  • P 2 min ⁇ P CMAX_2 ,y(M)+P O_1 + ⁇ 1 ⁇ PL SL ,y(M)+P O_2 + ⁇ 2 ⁇ PL DL +f ⁇
  • PCMAX_2 is the maximum transmit power of the second signal
  • y(M) is a function of the bandwidth of the second signal
  • PLSL is an estimated path loss value between the first terminal device and the second terminal device the PLDL path loss between the network device and the second terminal apparatus estimates the above PO_2 PO_1 target power
  • f is the above-mentioned adjustment parameter.
  • the first terminal device includes a terminal device with the largest path loss estimation value between the terminal device set and the second terminal device.
  • the terminal device set is a set of terminal devices that have established a connection with the second terminal device; or the terminal device set is a connection that has been established with the second terminal device and is within a distance of the second terminal device.
  • the processing unit 702 may be one or more processors, the sending unit 703 may be a transmitter, and the receiving unit 701 may be a receiver The transmitter, or the sending unit 703 and the receiving unit 701 are integrated into one device, such as a transceiver.
  • the processing unit 702 may be one or more processors, the sending unit 703 may be an output interface, the receiving unit 701 may be an input interface, or the sending unit 703 and the receiving unit 701 are integrated into one unit, For example, input and output interfaces.
  • FIG. 8 is a schematic structural diagram of a terminal device 800 according to an embodiment of the present application.
  • the terminal device may perform the method shown in FIG. 4, or the terminal device may also perform the operation of the power control device shown in FIGS. 6 and 7.
  • FIG. 8 shows only the main components of the terminal device.
  • the terminal device 800 includes a processor, a memory, a radio frequency link, an antenna, and input and output devices.
  • the processor is mainly used to process the communication protocol and communication data, and control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to execute the process described in FIG. 4.
  • the memory is mainly used to store software programs and data.
  • the radio frequency link is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • the terminal device 800 may further include input and output devices, such as a touch screen, a display screen, a keyboard, etc., which are mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminal devices may not have input/output devices.
  • the processor can read the software program in the storage unit, interpret and execute the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency link.
  • the radio frequency link processes the baseband signal after radio frequency processing, and then transmits the radio frequency signal in the form of electromagnetic waves through the antenna.
  • the radio frequency link receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data .
  • FIG. 8 shows only one memory and processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc. This embodiment of the present application does not limit this.
  • the processor may include a baseband processor and a central processing unit (CPU).
  • the baseband processor is mainly used to process communication protocols and communication data, and the CPU is mainly used to process the entire terminal.
  • the device controls, executes the software program, and processes the data of the software program.
  • the processor may also be a network processor (NP) or a combination of CPU and NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • the PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field programmable logic gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL), or any combination thereof.
  • the memory may include volatile memory (volatile memory), such as random access memory (random-access memory, RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) , Hard disk drive (HDD) or solid-state drive (SSD); storage can also include a combination of the above types of storage.
  • the antenna and the radio frequency link with the transceiver function may be regarded as the transceiver unit 801 of the terminal device 800, and the processor with the processing function may be regarded as the processing unit 802 of the terminal device 800.
  • the terminal device 800 may include a transceiver unit 801 and a processing unit 802.
  • the transceiver unit may also be called a transceiver, a transceiver, a transceiver device, or the like.
  • the device used to implement the receiving function in the transceiver unit 801 can be regarded as a receiving unit
  • the device used to implement the sending function in the transceiver unit 801 can be regarded as a sending unit, that is, the transceiver unit 801 includes a receiving unit and a sending unit.
  • the receiving unit may also be referred to as a receiver, receiver, receiving circuit, etc.
  • the transmitting unit may be referred to as a transmitter, transmitter, or transmitting circuit, etc.
  • the transceiver unit 801 and the processing unit 802 may be integrated into one device, or may be separated into different devices.
  • the processor and the memory may also be integrated into one device, or separated into different devices.
  • the transceiver unit 801 may be used to perform the methods shown in step 402 and step 403 shown in FIG. 4.
  • the transceiver unit 801 may be used to execute the method shown in step 406 shown in FIG. 4.
  • the processing unit 802 may be used to execute the method of controlling the transceiver unit 801 to perform steps 402 and 403 shown in FIG. 4.
  • the processing unit 802 may be used to control the transceiver unit 801 to execute the method shown in step 406 shown in FIG. 4.
  • the processing unit 802 may also be used to execute the method shown in step 401 shown in FIG. 4.
  • the processing unit 802 may be used to perform the methods shown in steps 404 and 405 shown in FIG. 4.
  • the transceiver unit 801 may be used to execute the method shown in the sending unit 602 and the receiving unit 603.
  • the processing unit 802 may be used to execute the method shown in the processing unit 601.
  • the transceiver unit 801 may be used to execute the method shown in the receiving unit 701 and the sending unit 703.
  • the processing unit 802 may be used to perform the method shown in the processing unit 702.
  • the embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above method embodiments may be completed by a computer program instructing relevant hardware.
  • the program may be stored in the above-mentioned computer storage medium. When the program is executed, it may include the processes as in the above method embodiments.
  • the computer-readable storage medium may be an internal storage unit of the power control device (including the first terminal device and/or the second terminal device) of any of the foregoing embodiments, such as a hard disk or a memory of the power control device.
  • the computer-readable storage medium may also be an external storage device of the power control device, such as a plug-in hard disk equipped on the power control device, a smart memory card (smart media (SMC), and secure digital (SD) Cards, flash cards, etc. Further, the above-mentioned computer-readable storage medium may also include both the internal storage unit of the above-mentioned power control device and an external storage device.
  • the computer-readable storage medium is used to store the computer program and other programs and data required by the power control device.
  • the above-mentioned computer-readable storage medium can also be used to temporarily store data that has been or will be output.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the usable medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), optical medium (eg, DVD), or semiconductor medium (eg, solid state disk (SSD)), or the like.
  • the modules in the device according to the embodiments of the present application may be combined, divided, and deleted according to actual needs.

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Abstract

本申请提供了一种功率控制方法及功率控制装置，该方法包括：第一终端设备根据第一数值确定第一信号的发射功率；其中，该第一数值为参考数值集合中的一个数值，该参考数值集合中包括至少两个功率值，且该第一数值不超过第一功率，该第一功率根据该第一信号的最大发射功率确定；该第一终端设备向第二终端设备发送指示信息，该指示信息用于指示或包括该第一数值；该第一终端设备以该第一信号的发射功率向该第二终端设备发送该第一信号。相应的，还提供了对应的装置。实施本申请，可合理的对功率进行控制。

Description

功率控制方法及功率控制装置 技术领域
本申请涉及通信技术领域，尤其涉及一种功率控制方法及功率控制装置。
背景技术
随着通信技术的演进，万物互联也在不断加速，万物互联的技术不仅包括窄带物联网(narrow band internet of things，NB-LOT)技术和增强机器类通信(enhanced machine type communication，eMTC)，还可包括物联物、端到端(device to device，D2D)技术等等。
其中，对于D2D技术来说，两个终端设备之间可以直接发送数据，即不需要先把数据发送给基站，再通过核心网的转发等等，可以大大减少数据时延。也就是说，在上述物物直连(sidelink)传输中，终端设备与终端设备之间互相通信。具体的，在LTE D2D中，终端设备与终端设备之间进行通信时，发送端通过以最大发射功率来发射信号以保证传输可靠性。
然而，LTE D2D中面临的主要业务类型是广播消息，而新无线(new radio，NR)D2D中需要引入单播或组播业务的传输，因此，在NR D2D中如何进行功率控制是本领域技术人员正在研究的问题。
发明内容
本申请提供了一种功率控制方法及功率控制装置，可合理地进行功率控制。
第一方面，本申请实施例提供了一种功率控制方法，包括：第一终端设备根据第一数值确定第一信号的发射功率；其中，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；所述第一终端设备向第二终端设备发送指示信息，所述指示信息用于指示或包括所述第一数值；所述第一终端设备以所述第一信号的发射功率向所述第二终端设备发送所述第一信号。
本申请实施例中，第一终端设备通过向第二终端设备指示第一数值，可使得第二终端设备根据该第一数值得到第一终端设备与第二终端设备之间的路径损耗估计值，从而使得该第二终端设备有效地确定直连链路传输时信号(如第二信号)的发射功率，提高了终端设备之间信号传输的可靠性。
结合第一方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
本申请实施例中，通过网络设备与第一终端设备之间的路径损耗估计值来确定第一数值，可避免第一信号的发射功率过大，而造成对其他终端设备向网络设备发送上行信号时的干扰，从而保证了终端设备之间传输的可靠性。
结合第一方面或第一方面的任一种可能的实现方式中，所述参考数值集合由所述网络设备配置；或者，所述参考数值集合为预定义的；或者，所述参考数值集合由所述第一终端设备的高层确定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一数值用于表示所述第一信号所在的第一正交频分复用OFDM符号上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一信号的发射功率为所述第一数值对 应的功率值；或者，所述第一信号的发射功率为所述第一数值对应的功率值与偏移功率值的和。
结合第一方面或第一方面的任一种可能的实现方式中，所述偏移功率值为预定义的，或者，所述偏移功率值由所述第一终端设备确定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一信号包括直连链路同步信号块SSSB，且所述SSSB中包括物理直连链路广播信道PSBCH、主直连链路同步信号PSSS以及辅直连链路同步信号SSSS；其中，所述指示信息包括以下至少一项：所述PSBCH的负载信息；所述PSBCH的解调参考信号DMRS的序列；所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值。
结合第一方面或第一方面的任一种可能的实现方式中，在所述指示信息包括所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值时，所述第一数值与所述功率差值有映射关系；其中，所述映射关系由所述网络设备配置；或者，所述映射关系为预定义的；或者，所述映射关系由所述第一终端设备的高层确定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一信号包括物理直连链路共享信道PSSCH，且所述指示信息携带于所述PSSCH中；或者，所述第一信号包括物理直连链路控制信道PSCCH，且所述指示信息携带于所述PSCCH中；或者，所述第一信号包括物理直连链路反馈信道PSFCH，且所述指示信息携带于所述PSFCH中。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一信号包括参考信号，且所述指示信息包括所述参考信号的序列，所述参考信号用于确定所述第一终端设备与所述第二终端设备之间的信道状态信息。
结合第一方面或第一方面的任一种可能的实现方式中，所述第一终端设备以所述第一信号的发射功率向所述第二终端设备发送所述第一信号之后，所述方法还包括：所述第一终端设备接收来自所述第二终端设备的第二信号；其中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定，所述第一终端设备与所述第二终端设备之间的路径损耗估计值根据所述第一信号的发射功率以及所述第一信号的接收功率确定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
可理解，y(M)还可理解为第二信号的带宽的表达式或关系式等等，本申请实施例不作限定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定。
结合第一方面或第一方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
结合第一方面或第一方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
第二方面，本申请实施例还提供了一种功率控制方法，包括：第二终端设备接收来自第一终端设备的第一信号以及指示信息；其中，所述指示信息用于指示或包括第一数值，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；所述第二终端设备根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与所述第二终端设备之间的路径损耗估计值。
本申请实施例中，第二终端设备通过第一终端设备发送的指示信息以及第一信号的接收功率，可有效地确定第一终端设备与第二终端设备之间的路径损耗估计值，从而使得第二终端设备可根据第一终端设备与第二终端设备之间的路径损耗估计值来发送其他信号(如第二信号)，进而避免了第二终端设备无法得知第一终端设备与第二终端设备之间的路径损耗估计值，而导致第二终端设备无法有效确定其他信号的发射功率的情况，即提高了终端设备之间信号传输的可靠性。
结合第二方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
结合第二方面或第二方面的任一种可能的实现方式中，所述第二终端设备根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与第二终端设备之间的路径损耗估计值之后，所述方法还包括：所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率；所述第二终端设备以所述第二信号的发射功率向所述第一终端设备发送所述第二信号。
结合第二方面或第二方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
结合第二方面或第二方面的任一种可能的实现方式中，所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率，包括：所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定所述第二信号的发射功率。
结合第二方面或第二方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
结合第二方面或第二方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
结合第二方面或第二方面的任一种可能的实现方式中，所述第一终端设备包括终端设备集合中与所述第二终端设备之间的路径损耗估计值最大的终端设备。
结合第二方面或第二方面的任一种可能的实现方式中，所述终端设备集合为与所述第二终端设备已经建立连接的终端设备组成的集合；或者所述终端设备集合为与所述第二终端设备已经建立连接，且与所述第二终端设备距离在参考范围内的终端设备组成的集合。
第三方面，本申请实施例提供了一种功率控制装置，该功率控制装置可作为第一终端设备使用，该第一终端设备包括：处理单元，用于根据第一数值确定第一信号的发射功率；其中，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；发送单元，用于向第二终端设备发送指示信息，所述指示信息用于指示或包括所述第一数值；所述发送单元，还用于以所述第一信号的发射功率向所述第二终端设备发送所述第一信号。
结合第三方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述参考数值集合由所述网络设备配置；或者，所述参考数值集合为预定义的；或者，所述参考数值集合由所述第一终端设备的高层确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一数值用于表示所述第一信号所在的第一正交频分复用OFDM符号上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一信号的发射功率为所述第一数值对应的功率值；或者，所述第一信号的发射功率为所述第一数值对应的功率值与偏移功率值的和。
结合第三方面或第三方面的任一种可能的实现方式中，所述偏移功率值为预定义的，或者，所述偏移功率值由所述第一终端设备确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一信号包括直连链路同步信号块SSSB，且所述SSSB中包括物理直连链路广播信道PSBCH、主直连链路同步信号PSSS以及辅直连链路同步信号SSSS；其中，所述指示信息包括以下至少一项：所述PSBCH的负载信息；所述PSBCH的解调参考信号DMRS的序列；所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值。
结合第三方面或第三方面的任一种可能的实现方式中，在所述指示信息包括所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值时，所述第一数值与所述功率差值有映射关系；其中，所述映射关系由所述网络设备配置；或者，所述映射关系为预定义的；或者，所述映射关系由所述第一终端设备的高层确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一信号包括物理直连链路共享信道PSSCH，且所述指示信息携带于所述PSSCH中；或者，所述第一信号包括物理直连链路控制信道PSCCH，且所述指示信息携带于所述PSCCH中；或者，所述第一信号包括物理直连链路反馈信道PSFCH，且所述 指示信息携带于所述PSFCH中。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一信号包括参考信号，且所述指示信息包括所述参考信号的序列，所述参考信号用于确定所述第一终端设备与所述第二终端设备之间的信道状态信息。
结合第三方面或第三方面的任一种可能的实现方式中，所述第一终端设备还包括：接收单元，用于接收来自所述第二终端设备的第二信号；其中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定，所述第一终端设备与所述第二终端设备之间的路径损耗估计值根据所述第一信号的发射功率以及所述第一信号的接收功率确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
结合第三方面或第三方面的任一种可能的实现方式中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定。
结合第三方面或第三方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
结合第三方面或第三方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
第四方面，本申请实施例还提供了一种功率控制装置，所述功率控制装置作为第二终端设备使用，所述第二终端设备包括：接收单元，用于接收来自第一终端设备的第一信号以及指示信息；其中，所述指示信息用于指示或包括第一数值，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；处理单元，用于根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与所述第二终端设备之间的路径损耗估计值。
结合第四方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
结合第四方面或第四方面的任一种可能的实现方式中，所述处理单元，还用于根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率；所述第二终端设备还包括：发 送单元，用于以所述第二信号的发射功率向所述第一终端设备发送所述第二信号。
结合第四方面或第四方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
结合第四方面或第四方面的任一种可能的实现方式中，所述处理单元，具体用于根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定所述第二信号的发射功率。
结合第四方面或第四方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
结合第四方面或第四方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
结合第四方面或第四方面的任一种可能的实现方式中，所述第一终端设备包括终端设备集合中与所述第二终端设备之间的路径损耗估计值最大的终端设备。
结合第四方面或第四方面的任一种可能的实现方式中，所述终端设备集合为与所述第二终端设备已经建立连接的终端设备组成的集合；或者所述终端设备集合为与所述第二终端设备已经建立连接，且与所述第二终端设备距离在参考范围内的终端设备组成的集合。
第五方面，本申请实施例还提供了一种终端设备，所述终端设备作为第一终端设备使用，所述第一终端设备包括处理器、存储器和收发器，所述处理器和所述存储器耦合，所述处理器用于运行所述存储器内的指令或程序，所述处理器，用于根据第一数值确定第一信号的发射功率；其中，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；所述收发器与所述处理器耦合，所述收发器用于向第二终端设备发送指示信息，所述指示信息用于指示或包括所述第一数值；所述收发器，还用于以所述第一信号的发射功率向所述第二终端设备发送所述第一信号。
结合第五方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述参考数值集合由所述网络设备配置；或者，所述参考数值集合为预定义的；或者，所述参考数值集合由所述第一终端设备的高层确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述第一数值用于表示所述第一信号所在的 第一正交频分复用OFDM符号上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
结合第五方面或第五方面的任一种可能的实现方式中，所述第一信号的发射功率为所述第一数值对应的功率值；或者，所述第一信号的发射功率为所述第一数值对应的功率值与偏移功率值的和。
结合第五方面或第五方面的任一种可能的实现方式中，所述偏移功率值为预定义的，或者，所述偏移功率值由所述第一终端设备确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述第一信号包括直连链路同步信号块SSSB，且所述SSSB中包括物理直连链路广播信道PSBCH、主直连链路同步信号PSSS以及辅直连链路同步信号SSSS；其中，所述指示信息包括以下至少一项：所述PSBCH的负载信息；所述PSBCH的解调参考信号DMRS的序列；所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值。
结合第五方面或第五方面的任一种可能的实现方式中，在所述指示信息包括所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值时，所述第一数值与所述功率差值有映射关系；其中，所述映射关系由所述网络设备配置；或者，所述映射关系为预定义的；或者，所述映射关系由所述第一终端设备的高层确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述第一信号包括物理直连链路共享信道PSSCH，且所述指示信息携带于所述PSSCH中；或者，所述第一信号包括物理直连链路控制信道PSCCH，且所述指示信息携带于所述PSCCH中；或者，所述第一信号包括物理直连链路反馈信道PSFCH，且所述指示信息携带于所述PSFCH中。
结合第五方面或第五方面的任一种可能的实现方式中，所述第一信号包括参考信号，且所述指示信息包括所述参考信号的序列，所述参考信号用于确定所述第一终端设备与所述第二终端设备之间的信道状态信息。
结合第五方面或第五方面的任一种可能的实现方式中，所述收发器，还用于接收来自所述第二终端设备的第二信号；其中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定，所述第一终端设备与所述第二终端设备之间的路径损耗估计值根据所述第一信号的发射功率以及所述第一信号的接收功率确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
结合第五方面或第五方面的任一种可能的实现方式中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定。
结合第五方面或第五方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为 路损补偿因子。
结合第五方面或第五方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
第六方面，本申请实施例还提供了一种终端设备，所述终端设备作为第二终端设备使用，所述第二终端设备包括处理器、存储器和收发器，所述处理器和所述存储器耦合，所述处理器用于运行所述存储器内的指令或程序，所述收发器与所述处理器耦合，所述收发器用于接收来自第一终端设备的第一信号以及指示信息；其中，所述指示信息用于指示或包括第一数值，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；所述处理器，用于根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与所述第二终端设备之间的路径损耗估计值。
结合第六方面，在一种可能的实现方式中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
结合第六方面或第六方面的任一种可能的实现方式中，所述处理器，还用于根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率；所述收发器，还用于以所述第二信号的发射功率向所述第一终端设备发送所述第二信号。
结合第六方面或第六方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
结合第六方面或第六方面的任一种可能的实现方式中，所述处理器，具体用于根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定所述第二信号的发射功率。
结合第六方面或第六方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
结合第六方面或第六方面的任一种可能的实现方式中，所述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为 路损补偿因子，所述f为调整参数。
结合第六方面或第六方面的任一种可能的实现方式中，所述第一终端设备包括终端设备集合中与所述第二终端设备之间的路径损耗估计值最大的终端设备。
结合第六方面或第六方面的任一种可能的实现方式中，所述终端设备集合为与所述第二终端设备已经建立连接的终端设备组成的集合；或者所述终端设备集合为与所述第二终端设备已经建立连接，且与所述第二终端设备距离在参考范围内的终端设备组成的集合。
第七方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
第八方面，本申请实施例提供了一种包括指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
图1是本申请实施例提供的一种通信系统的结构示意图；
图2a是本申请实施例提供的一种传输路径的示意图；
图2b是本申请实施例提供的另一种传输路径的示意图；
图2c是本申请实施例提供的又一种传输路径的示意图；
图3a是本申请实施例提供的一种直连链路通信的场景示意图；
图3b是本申请实施例提供的另一种直连链路通信的场景示意图；
图3c是本申请实施例提供的又一种直连链路通信的场景示意图；
图3d是本申请实施例提供的又一种直连链路通信的场景示意图；
图3e是本申请实施例提供的又一种直连链路通信的场景示意图；
图3f是本申请实施例提供的又一种直连链路通信的场景示意图；
图3g是本申请实施例提供的又一种直连链路通信的场景示意图；
图4是本申请实施例提供的一种功率控制方法的流程示意图；
图5a是本申请实施例提供的一种S-SSB的结构示意图；
图5b是本申请实施例提供的另一种S-SSB的结构示意图；
图6是本申请实施例提供的一种功率控制装置的结构示意图；
图7是本申请实施例提供的另一种功率控制装置的结构示意图；
图8是本申请实施例提供的一种终端设备的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图对本申请实施例进行描述。
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
应当理解，在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上，“至少两个(项)”是指两个或三个及三个以上，“和/或”，用于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：只存在A，只存在B以及同时存在A和B三种情况，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和b和c”，其中a，b，c可以是单个，也可以是多个。
以下将具体描述本申请实施例中的场景。
本申请使用的通信系统可理解为无线蜂窝通信系统，又或者理解为基于蜂窝网络架构的无线通信系统。例如第五代移动通信(5th-generation，5G)系统以及下一代移动通信等等。图1是本申请实施例提供的一种通信系统的示意图，本申请中的方案可适用于该通信系统。该通信系统可以包括至少一个网络设备，仅示出一个，如图中的下一代基站(the next generation Node B，gNB)；以及与该网络设备连接的一个或多个终端设备，如图中的终端设备1和终端设备2。
其中，网络设备可以是能和终端设备通信的设备。网络设备可以是任意一种具有无线收发功能的设备，包括但不限于基站。例如，该基站可以为gNB，又或者该基站为未来通信系统中的基站。可选的，该网络设备还可以为无线局域网(wireless fidelity，WiFi)系统中的接入节点、无线中继节点、无线回传节点等。可选的，该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。可选的，该网络设备还可以是可穿戴设备或车载设备等。可选的，该网络设备还可以是小站，传输节点(transmission reference point，TRP)等。当然本申请不限于此。
终端设备，也可称为用户设备(user equipment，UE)、终端等。终端设备是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上，如轮船上等；还可以部署在空中，例如部署在飞机、气球或卫星上等。终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)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)中的无线终端等等。
可理解，图1所示的通信系统中，终端设备1和终端设备2也可以通过设备到设备(device to device，D2D)技术或车与任何事物通信(vehicle-to-everything，V2X)技术进行通信。
在一般的无线通信系统中，如在长期演进(long term evolution，LTE)系统中，在终端设备1和终端设备2需要进行数据交互的情况下，传输路径可如图2a所示，图2a是本申请实施例提供的一种终端设备与终端设备之间传输路径的示意图。如图2a所示，终端设备1可先向演进型基站(evolved NodeB，eNodeB)1发送数据，该eNB1再将该数据发送给核心网(core network，CN)，该CN可包括如服务网关(serving gateway，SGW)、PDN网关(PDN gateway，PGW)和移动性管理实体(mobility management entity，MME)；该CN接收到该数据之后，该CN将该数据发送给eNB2，该eNB2再将接收到的数据发送给终端设备2。可理解，图2a是以终端设备为UE为例来说明的，但是不应将图2a中所示的UE理解为对本申请的限定。
可理解，图2a所示的传输路径仅为一种示例，在具体实现中，终端设备1和终端设备2可能属于同一个小区等等，本申请实施例对于图2a所示的传输路径不作唯一性限定。
然而，第五代移动通信技术(5th-generation，5G)中新无线(new radio，NR)是在第三代合作 伙伴计划(3rd generation partnership project，3GPP)组织中新近提出的一个课题，位于release 14中。在过去的近10年中，3GPP组织提出的LTE标准已经被全世界广泛使用，被称作第四代移动通信技术(4th-generation，4G)。例如，中国移动、中国联通、中国电信，都分别采用了4G LTE时分双工(time division duplexing，TDD)和频分双工(frequency division duplexing，FDD)模式的传输技术，并为广大用户提供了高速便捷的移动网络服务。
而随着新一代5G技术进入讨论阶段，原先4G LTE里已经达到的系统结构和接入流程是否继续采纳？一方面，由于通信系统是后项兼容的，所以后来研发的新技术倾向于兼容之前已经标准化的技术；而另一方面，由于4G LTE已经存在了大量的现有设计，如果为了达到兼容，必然要牺牲掉5G的很多灵活度，从而降低性能。所以，目前在3GPP组织中两个方向并行研究，两个方向中，不考虑后向兼容的技术讨论组，被称为5G NR。
进一步地，随着通信技术的演进，万物互联也在不断加速，3GPP规范引入了多个万物互联的技术，NB-IOT技术，eMTC技术等，这些都是物联网技术，另外3GPP还引入了物联物、端到端的技术，例如D2D。其中，D2D是一种概述，而邻近服务(proximity-based service，ProSe)基于近距离的服务，这是3GPP中实现D2D技术的一种业务名称。而直连链路(sidelink communication，SL)通信技术，是实现ProSe服务的一种技术。其中，车联万物或车载技术(vehicle-to-everything，V2X)也是一种物联物技术。
在物物直连系统中，如在D2D技术中(又称为邻近服务(proximity-based service，ProSe))，在终端设备1和终端设备2需要进行数据交互的情况下，该传输路径可如图2b和图2c所示。如图2b所示，终端设备1与终端设备2之间可直接进行数据交互。又如图2c所示，终端设备1与终端设备2也可仅通过gNB进行数据交互。可理解，图中所示的基站仅为一种示例，不应理解为对本申请的限定。
也就是说，在直连链路(sidelink)中，两个终端设备之间可以直接传输数据，而不需要先把数据发送给基站，通过核心网的转发，再发给接收终端设备。从而可以大大减少数据时延，但是由于终端设备的发射功率有限，直连链路一般仅限于距离较近的通信。如对于D2D技术来说，可应用于基于邻近特性的社交应用，如通过D2D进行内容分享、互动游戏等邻近终端设备之间数据的传输。还可解决自然灾害引起通信基础设施损坏导致通信中断而给救援带来障碍的问题，如在该场景下，通过D2D，两个邻近的终端设备之间仍然能够建立无线通信。又如还可基于D2D向用户推送商品打折促销、影院预告等信息等等，本申请实施例对于D2D所应用的场景不作唯一性限定。
以下将以D2D为例，来说明直连链路通信的场景。
如图3a至图3g所示，分别为本申请实施例提供的一种直连链路通信的场景示意图。可理解，图中是以UE为例来说明该直连链路通信场景，但是不应将其理解为对本申请实施例的限定。
图3a所示的场景中终端设备1和终端设备2均处于小区覆盖范围外。
图3b所示的场景中终端设备1处于小区覆盖范围内，而终端设备2处于小区覆盖范围外。
图3c所示的场景中终端设备1和终端设备2均处于同一个小区的覆盖范围内，且在一个公共陆地移动网络(public land mobile network，PLMN)中，如PLMN1。
图3d所示的场景中终端设备1和终端设备2在一个PLMN中如PLMN1，但处于不同的小区覆盖范围。
图3e所示的场景中终端设备1和终端设备2分别在不同的PLMN，不同的小区，且终端设备1和终端设备2分别处于两个个小区的共同覆盖范围内。如终端设备1在PLMN1中，而终端设备2在PLMN2中。
图3f所示的场景中终端设备1和终端设备2分别在不同的PLMN，不同的小区，且终端设备1在两 个小区的共同覆盖范围内，终端设备2在服务小区的覆盖范围内。
图3g所示的场景中终端设备1和终端设备2分别在不同的PLMN，不同的小区，且终端设备1和终端设备2分别在各自的服务小区的覆盖范围内。
可理解，以上所示的场景也可适用于车联万物(vehicle-to-everything，V2X)，也可称为车载技术(vehicle to everying，V2X)中，这里不再一一详述。
可理解，本申请实施例中所描述的直连链路(sidelink)，也可理解为侧行链路(sidelink)等等，本申请实施例对于该sidelink的具体名称不作唯一性限定。
进一步地，在3GPP标准中，终端设备和基站之间的通信接口称为UU接口，终端设备和终端设备之间的通信接口称为PC5接口。以下举例介绍NR中UU口的上行功率控制。
以物理上行共享信道(physical uplink shared channel，PUSCH)为例，其功率所满足的公式可如下所示:
Figure PCTCN2020071813-appb-000001
整体来看，最终的发射功率为两项里面取较小的值，其中第一项为P CMAX,f,c(i)，该项可表示为PUSCH的最大发射功率。可理解，该PUSCH的最大发射功率在一些实现方式中还可理解为终端设备的最大发射功率。第二项为一个比较复杂的公式，具体的，对整个公式的理解方式为：终端设备应当按照第二项的公式计算发射功率，当第二项公式计算出来的值超过终端设备的最大发射功率(即第一项公式)时，由于终端设备物理硬件受限，无法达到第二项公式要求的发射功率，因此，终端设备只能以最大发射功率(即第一项公式)来发射信号。
以下详细介绍公式(1)。
其中，P O_PUSCH,f,c(j)为PUSCH的目标功率，具体可以理解为在基站处PUSCH的目标功率值，即PUSCH到达基站时，期望PUSCH能够达到的功率，该值可由基站配置。
其中，PL b,f,c(q d)是终端设备通过基站发送的下行信号估计得到的。具体而言，终端设备会根据基站发送的信号如同步信号块(synchronization signal block，SSB)，计算出该SSB的接收功率。同时基站会在物理广播信道(physical broadcast channel，PBCH)中广播该SSB的发射功率。终端设备通过比较该SSB的接收功率和发射功率，就能够得到基站与终端设备之间的下行路径损耗估计值。此时，利用信道互易性，终端设备便可得到上下行的路径损耗估计值(如基站与终端设备之间的上行路径损耗估计值与该基站与该终端设备之间的下行路径损耗估计值大致相同)。
α b,f,c(j)×PL b,f,c(q d)为对路径损耗的补偿值。其中，PL b,f,c(q d)为路径损耗估计值；α b,f,c(j)为路径损耗补偿因子，当该值为1时，即表示对路径损耗进行了完全补偿。可理解，该α b,f,c(j)的值可由基站配置。
P O_PUSCH,f,c(i)+α b,f,c(j)·PL b,f,c(q d)可以理解为在设定了基站的目标功率后，对目标功率进行路径损耗补偿，就可以得到终端设备的目标发射功率是多少。
其中，公式
Figure PCTCN2020071813-appb-000002
中，
Figure PCTCN2020071813-appb-000003
为PUSCH的带宽，其中
Figure PCTCN2020071813-appb-000004
可表示该PUSCH的RB数量，μ表示终端设备发射时的系统参数(numerology)，或者也可以理解为参数集等等，本申请实施例对μ的具体名称不作限定。
因此，P O_PUSCH,f,c(i)+α b,f,c(j)·PL b,f,c(q d)可具体理解为单位带宽的信号的目标发射功率。
Figure PCTCN2020071813-appb-000005
则可理解为整个PUSCH带宽的信号的目标发射功率。进一步地，该三项和可以称为“开环功率控制”，即终端设备通过目标接收功率，估计路径损耗并进行补偿，确定发射功率(即不需要基站的反馈调整)。
其中，Δ TF,b,f,c(i)+f b,f,c(i)为“闭环功率调整”部分。Δ TF,b,f,c(i)可表示为终端设备针对当前PUSCH的发射功率进行的调整。如当前PUSCH采用的调制阶次越高，为保证传输可靠性，所需要的发射功率越大。f b,f,c(i)为基站直接调整发射功率的“发射功率命令”部分，由基站直接通过下行控制信息(downlink control information，DCI)指示当前PUSCH的发射功率是否需要调大或调小。
同时，在LTE中，直连链路传输中还可包括如下几个信道：物理直连链路共享信道(physical sidelink shared channel，PSSCH)、物理直连链路控制信道(physical sidelink control channel，PSCCH)、物理直连链路发现信道(physical sidelink discovery channel，PSDCH)。作为示例，这三个信道的功率满足分别满足如下公式：
P PSSCH＝min{P CMAX,PSSCH,10log 10(M PSSCH)+P O_PSSCH+α PSSCH·PL}   (2)
P PSCCH＝min{P CMAX,PSCCH,10log 10(M PSCCH)+P O_PSCCH+α PSCCH·PL}   (3)
P PSDCH＝min{P CMAX,PSDCH,10log 10(M PSDCH)+P O_PSDCH+α PSDCH·PL}   (4)
其中，PPSSCH为PSSCH的发射功率，PPSCCH为PSCCH的发射功率，PPSDCH为PSDCH的发射功率；PCMAX,PSSCH为PSSCH的最大发射功率，PCMAX,PSCCH为PSCCH的最大发射功率，PCMAX,PSDCH为PSDCH的最大发射功率；MPSSCH为PSSCH的带宽，MPSCCH为PSCCH的带宽，MPSDCH为PSDCH的带宽；PO_PSSCH为PSSCH的目标功率，PO_PSCCH为PSCCH的目标功率，PO_PSDCH为PSDCH的目标功率；PL为基站与终端设备之间的路径损耗估计值。
从中可以看出，在LTE的直连链路传输中，PL仍然为根据下行信号得到的路径损耗估计值，而非根据发射终端设备和接收终端设备之间的直传链路得到的路径损耗估计值。其原因在于，在设计LTE的直连链路时，在物理层不支持混合自动重传请求(hybrid automatic repeat request，HARQ)反馈，因此发射终端设备(或发送端)只能尽可能用较大的发射功率发射信号以保证传输可靠性。但是该发射功率又不能太大，以免造成对其他终端设备上行信号的干扰(如基站本来要接收其他终端设备的上行信号，但是直连链路中发射终端设备的信号功率太大，对其他终端设备的上行信号产生较大干扰，导致基站无法正常接收该其他终端设备的上行信号)。因此本申请实施例提供了一种功率控制方法，即直连链路中终端设备的发射功率以发射终端设备与接收终端设备之间的路径损耗估计作为参考，来确定发射功率。
图4是本申请实施例提供的一种功率控制方法的流程示意图，该功率控制方法可应用于图3a至图3g所示的任意场景，以及该功率控制方法还可应用于图1所示的通信系统。如图4所示，该功率控制方法包括：
401、第一终端设备根据第一数值确定第一信号的发射功率；其中，上述第一数值为参考数值集合中的一个数值，上述参考数值集合中包括至少两个功率值，且上述第一数值不超过第一功率，上述第一功率根据上述第一信号的最大发射功率确定。
本申请实施例中，参考数值集合中可包括至少两个功率值，该功率值具体可理解为信号的发射功率 值。也就是说，该参考数值集合中可包括K个功率可选值，该K为大于或等于2的整数。作为示例，该参考数值集合中可包括第一数值、第二数值以及第三数值等等，本申请实施例对于该参考数值集合中具体包括多少个功率数值不作限定。其中，该参考数值集合可由网络设备如基站配置，还可为预定义的，又或者由第一终端设备的高层确定。作为示例，如在第一终端设备与第二终端设备均处于同一个小区的覆盖范围内时，该参考数值集合可由基站配置，从而使得该第一终端设备和该第二终端设备均能得知该参考数值集合。又如第一终端设备处于小区覆盖范围之外时，该参考数值集合可为预定义，通过预定义该参考数值集合，可避免第一终端设备无法得知参考数值集合而无法确定第一信号的发射功率的情况。又如第一终端设备可通过应用层或无线资源控制(radio resource control，RRC)层等等来确定该参考数值集合，又如该第一终端设备还可通过应用层或RRC层与第二终端设备相互协商该参考数值集合。
具体的，第一终端设备可从该K个功率可选值中选择第一数值，该第一数值的限定条件包括如不超过第一功率，该第一功率可根据第一信号的最大发射功率确定。可理解，在一些实现方式中如在终端设备仅仅发送第一信号时，该第一信号的最大发射功率还可理解为终端设备的最大发射功率。该第一终端设备的最大发射功率可理解为第一终端设备的物理硬件受限的最大发射功率，或者，也可理解为该第一终端设备的硬件所能允许的最大发射功率。作为示例，该第一终端设备的最大发射功率可根据基站的高层配置参数计算得到。
可选的，为避免第一终端设备发射第一信号时的发射功率过大，而造成对其他终端设备的上行信号的干扰，该第一数值的限定条件还可包括如不超过第二功率，该第二功率根据网络设备如基站与第一终端设备之间的路径损耗估计值确定。
可理解，在第一终端设备从K个功率可选值中确定出第一数值的情况下，该K个功率可选值中所包括的其他数值如第二数值或第三数值与第一功率和第二功率的关系，本申请实施例不作限定。举例来说，第一终端设备从K个功率可选值中确定出的满足第一功率和第二功率的功率值不仅包括第一数值，还包括第二数值，该情况下，该第一终端设备可随机从第一数值和第二数值中确定出一个数值如第一数值。又或者，该情况下，该第一终端设备还可从第一数值和第二数值中确定出一个较大的数值，如第一数值大于第二数值，则可以确定出第一数值。又举例来说，第一终端设备从K个功率可选值中确定出的第一数值能够同时满足第一功率和第二功率，而第二数值仅仅满足第一功率，但是不满足第二功率。
可理解，对于该第一数值具体所表示的含义，可参考以下相关实施例的描述，这里先不详述。
402、上述第一终端设备向第二终端设备发送指示信息，上述指示信息用于指示或包括上述第一数值；上述第二终端设备接收来自上述第一终端设备的上述指示信息。
其中，该指示信息可根据第一信号不同，而承载于不同的信息中。或者，还可理解为该指示信息可根据第一信号的不同，而包含于不同的信息中。也就是说，该指示信息可包括不同类型的指示形式或指示方式。
可理解，对于该指示信息的具体指示方式可参考以下相关实施例的描述，这里先不详述。
403、上述第一终端设备以上述第一信号的发射功率向上述第二终端设备发送上述第一信号；上述第二终端设备接收来自上述第一终端设备的上述第一信号。
可理解，一般来说，信道也可理解为信号，因此本申请实施例中，第一信号不仅可包括某个信号，还可包括某个信道。作为示例，该第一信号中还可包括如物理直连链路共享信道(physical sidelink shared channel，PSSCH)、物理直连链路控制信道(physical sidelink control channel，PSCCH)和物理直连链路反馈信道(physical sidelink feedback channel，PSFCH)等等。可理解以上所示的几个信道仅为一种示例，在具体实现中还可以包括其他信道，本申请实施例不作限定。
404、上述第二终端设备根据上述指示信息以及上述第一信号的接收功率确定上述第一终端设备与上述第二终端设备之间的路径损耗估计值。
本申请实施例中，第二终端设备可根据指示信息所指示的第一数值来得到第一信号的发射功率。其中，该第一信号的发射功率可以为第一数值对应的功率值，或者，该第一信号的发射功率还可以为第一数值对应的功率值与偏移功率值的和。由此第二终端设备便可根据该第一信号的发射功率以及该第一信号的接收功率来得到第一终端设备与第二终端设备之间的路径损耗估计值。
405、上述第二终端设备根据上述第一终端设备与上述第二终端设备之间的路径损耗估计值确定第二信号的发射功率。
本申请实施例中，第二信号不仅可指某个信号，还可指某个信道。对于该第二信号的具体描述，可参考第一信号的具体描述，这里不再一一详述。
可理解，对于第二信号的发射功率所满足的公式具体可参考以下实施例，这里先不一一详述。
406、上述第二终端设备以上述第二信号的发射功率向上述第一终端设备发送上述第二信号；上述第一终端设备接收上述第二信号。
本申请实施例中，第一终端设备通过向第二终端设备指示第一数值，可使得第二终端设备根据该第一数值得到第一终端设备与第二终端设备之间的路径损耗估计值，从而使得该第二终端设备有效地确定直连链路传输时第二信号的发射功率，提高了终端设备之间交互的效率，即第二终端设备通过以直连链路中终端设备与终端设备之间的路径损耗估计值作为参考来确定第二信号的发射功率，不仅更好地确定了第二信号的发射功率，还避免了对其他终端设备上行信号的干扰(即第二信号不超过基站与第二终端设备之间的路径损耗估计值)，保证了信号传输的可靠性。
为形象的理解图4所示的功率控制方法，接下来，详细描述第一终端设备向第二终端设备发送第一信号的方法。
本申请的一些实施例中，第一信号可包括直连链路同步信号块(sidelink synchronization signal block，S-SSB)。以下先以SSSB为例来说明图4所示的方法。
图5a是本申请实施例提供的一种S-SSB的结构示意图，如图5a所示，该S-SSB可包括直连链路物理广播信道(physical sidelink broadcast channel，PSBCH)、直连链路主同步信号(primary sidelink synchronization signal，PSSS)以及直连链路辅同步信号(secondary sidelink synchronization signal，SSSS)。
该实施例中，第一终端设备发送S-SSB时，可根据第一数值确定S-SSB的发射功率。如图5a所示，S-SSB在时域上占用了四个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号(symbol)。从图5a中可看出，PSSS与SSSS分别占用了一个OFDM符号，而PSBCH占用了两个OFDM符号，因此，可将S-SSB占用的四个OFDM符号划分为第一OFDM符号、第二OFDM符号、第三OFDM符号和第四OFDM符号，如PSSS占用的OFDM符号可称为第一OFDM符号、SSSS占用的OFDM符号可称为第二OFDM符号，PSBCH占用的两个OFDM符号可分别称为第三OFDM符号和第四OFDM符号。可理解，图5a所示出的S-SSB的结构仅为一种示例，在具体实现中，PSSS、PSBCH与SSSS的带宽关系，本申请实施例不作限定，如PSSS与SSSS的带宽即可以相同，也可以不同等等。
可选的，该第一数值可用于表示S-SSB所在的第一OFDM符号上的发射功率。其中，在第一数值表示S-SSB占用的第一OFDM符号上的发射功率的情况下，本申请实施例可根据第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率是否相同，提供以下实施方式。可理解，第三OFDM符号和第四OFDM 符号上的发射功率可认为是相同的。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率相同的情况下，S-SSB的发射功率可满足如下公式：
P S-SSB＝P′ S-SSB   (5)
其中，PS-SSB为S-SSB的发射功率，P′ S-SSB为第一数值。
具体的，该P′ S-SSB还满足如下公式：
P′ S-SSB∈{P S-SSB,1,P S-SSB,2,…P S-SSB,K}   (6)
其中，P S-SSB,K为第K个功率可选值。
进一步地，P′ S-SSB还满足公式(7)和公式(8)，如下所示：
P′ S-SSB≤P S-SSB,MAX   (7)
其中，PS-SSB,MAX为S-SSB的最大发射功率，该S-SSB的最大发射功率在一些实现方式中可理解为第一终端设备的物理硬件受限的最大发射功率，或者，也可理解为该第一终端设备的硬件所能允许的最大发射功率。该S-SSB的最大发射功率还可由第一终端设备根据基站配置的参数计算得到等等，本申请实施例对于该S-SSB的最大发射功率的计算方式不作限定。
P′ S-SSB≤P O_SSSB,DL+α S-SSB,DL×PL DL   (8)
其中，PS-SSB为S-SSB的发射功率；P′ S-SSB为第一数值；PO_SSSB,DL为S-SSB的目标接收功率，该值可由基站配置；PLDL为基站与第一终端设备之间的路径损耗估计值；α S-SSB,DL为S-SSB的路损补偿因子，该值可由基站配置。
可选的，在该实施例中，还可以不以S-SSB为单位规定发射功率，而是分别设置PSSS、SSSS以及PSBCH的发射功率。因此，PSSS、SSSS以及PSBCH的发射功率可分别满足如下公式：
P PSSS＝P′ S-SSB   (9)
P SSSS＝P′ S-SSB   (10)
P PSBCH＝P′ S-SSB   (11)
其中，PPSSS为PSSS的发射功率，PSSSS为SSSS的发射功率，PPSBCH为PSBCH的发射功率，P′ S-SSB为第一数值。
具体的，该P′ S-SSB不仅满足公式(6)，还满足如下公式：
P′ S-SSB≤min(P PSSS,MAX,P SSSS,MAX,P PSBCH,MAX)   (12)
P′ S-SSB≤min(P O_PSSS,DL+α PSSS,DL×PL DL,P O_SSSS,DL+α SSSS,DL×PL DL,P O_PSBCH,DL+α PSBCH,DL×PL DL)(13)
其中，PPSSS,MAX，PSSSS,MAX，PPSBCH,MAX分别为PSSS、SSSS和PSBCH的最大发射功率；PO_PSSS,DL为PSSS的目标接收功率(即目标功率)，PO_SSSS,DL为SSSS的目标接收功率，PO_PSBCH,DL为PSBCH的目标接收功率。PLDL为基站与第一终端设备之间的路径损耗估计值，α PSSS,DL为PSSS的路损补偿因子，α SSSS,DL为SSSS的路损补偿因子，α PSBCH,DL为PSBCH路损补偿因子。可理解，本申请实施例中，将不同信号或信道的路损补偿因子或目标接收功率表示为不同的参数，在具体实现中，该PSSS、SSSS与PSBCH的路损补偿因子可能还为同一个参数(或者也可理解为α PSSS,DL＝α SSSS,DL＝α PSBCH,DL)，以及该PSSS、SSSS与PSBCH的目标接收功率也可能为同一个参数(或者也可理解为PO_PSSS,DL＝PO_SSSS,DL＝PO_PSBCH,D)，因此，不应将本申请实施例所示出的公式理解为对本申请实施例的限定。
该实施例中，第一信号即S-SSB的发射功率即为第一数值所对应的功率值，如SSSB的发射功率等于第一数值所对应的功率值。
进一步地，在该实施例中，第一终端设备向第二终端设备发送的指示信息可包括以下至少一项：
1)PSBCH的负载信息；2)PSBCH的解调参考信号(demodulation reference signal，DMRS)的序列。
也就是说，指示信息不仅可由PSBCH的负载信息确定，也可由PSBCH的DMRS的序列确定等。具体的，如指示信息可包括PSBCH的负载信息，即第一终端设备可通过PSBCH的负载信息来指示或包括第一数值。作为示例，第一终端设备可通过
Figure PCTCN2020071813-appb-000006
比特来指示第一数值。例如，当K＝8时，可以在PSBCH的负载信息中通过3bit信息来指示第一数值。又如指示信息还可包括PSBCH的DMRS序列中，即第一终端设备还可以通过PSBCH的DMRS序列来指示第一数值。作为示例，PSBCH的DMRS可选序列有K个，则该K个可选序列可对应K个可选功率值，即每个可选序列与每个可选功率值一一对应。由此在第二终端设备接收到PSBCH时，可分别盲检K个可选序列，从而确定了DMRS的序列，便可确定第一数值。又如指示信息既可包含于PSBCH的负载信息中，又可包含于DMRS的序列中，即第一终端设备还可以通过PSBCH的负载信息以及PSBCH的DMRS的序列来指示第一数值。作为示例，K＝8，PSBCH的DMRS可选序列有2种。由此可以将8种可选功率值分为2组，每组对应一种DMRS可选序列。同时，在PSBCH的负载信息中使用2bit信息指示每组4个可选功率值中的某一个值。
可理解，在具体实现中，可能会存在一些误差，如K＝4，K个功率可选值分别为{16dBm，18dBm，20dBm，22dBm}，而第一终端设备确定的发射功率为20.31dBm。该情况下，指示信息可以指示第一数值即20dBm(即指示信息可通过2比特的信息量来指示20dBm)，即以第一数值的数值为基础来确定指示信息，且第一终端设备最终确定的S-SSB的发射功率为20dBm。可选的，该第一终端设备还可以以20.31dBm发射S-SSB，且指示信息可通过如10比特的信息量来指示20.31dBm，此时20.31dBm也为K个功率可选值中的一个，K小于且等于1024(即2的10次方)。本申请实施例对于以上具体实现不作限定。
本实施例中，第一终端设备通过保证PSSS、SSSS和PSBCH的发射功率相同，可使得该第一终端设备的发射S-SSB的4个OFDM符号内的发射功率保持恒定(即对于第一终端设备来说，功率放大器的放大倍数易确定)，从而有助于保证第一终端设备发射功率的稳定。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率可满足如下公式：
P PSSS＝P′ S-SSB+A   (14)
P SSSS＝P′ S-SSB+B   (15)
P PSBCH＝P′ S-SSB+C   (16)
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
P′ S-SSB≤min(P PSSS,MAX-A,P SSSS,MAX-B,P PSBCH,MAX-C)   (17)
Figure PCTCN2020071813-appb-000007
其中，A、B和C分别表示偏移功率值，或者，也可称为偏移值(offset)。可选的，A、B和C可为预定义的，或者，也可由第一终端设备确定。可理解，该实施例中，第一信号即S-SSB的发射功率即为第一数值对应的功率值与偏移功率值的和。可理解，对于公式(14)至公式(18)中其他参数的详细描述，可参考公式(9)至公式(13)的详细描述，这里不再一一详述。
其中，在A、B和C为预定义的情况下，即第一终端设备和第二终端设备均知道该值。如A＝3，B＝C＝0，可表示PSSS的功率比SSSS(或PSBCH)高3dB，SSSS与PSBCH的功率相等。通过提高PSSS的发射功率可提高PSSS的检测精度，从而提高了第一终端设备的被探测概率。
可理解，在A、B和C为预定义的情况下，指示信息的指示方式如可通过PSBCH的负载信息指示，又或者通过PSBCH的DMRS序列指示等等，其详细描述可参考前述实施例，这里不再一一详述。
其中，在A、B和C由第一终端设备确定的情况下，第一终端设备可通过PSBCH、PSSS以及SSSS中至少两项的功率差值来指示第一数值。也就是说，该情况下，指示信息可通过PSBCH、PSSS以及SSSS中至少两项的功率差值来指示。进一步地，第一数值与功率差值之间有映射关系，也就是说，第一数值与功率差值之间有一一对应的关系。可选的，该映射关系可由基站配置，或者为预定义的，或者由第一终端设备的高层确定。
如第一终端设备可通过PSSS、SSSS、PSBCH之间的功率差值指示第一数值。作为示例，如K＝4(k＝0～3)，当PSBCH的发射功率比PSSS的发射功率低3*k dB时，对应PSSS的发射功率可为第k个可选值。比如PSSS的发射功率可选值分别为14dBm，16dBm，18dBm和20dBm。当第一终端设备将PSSS的发射功率设置为18dBm(对应k＝2)时，PSBCH的发射功率比PSSS的发射功率低3*k＝3*2＝6dB，即PSBCH的发射功率为12dBm。第二终端设备接收到S-SSB时，可以通过对比接收功率，确定接收到的PSSS与PSBCH之间的功率相差为6dB，从而得知第一终端设备确定的是4个可选值中k＝6/3＝2的一个，即18dBm，进一步可以确定PSBCH的发射功率为12dBm。
再例如，K＝4，SSSS的发射功率与PSBCH的发射功率相等时，对应k＝0/1，SSSS的发射功率比PSBCH的发射功率高3dB时，对应k＝2/3。再比较PSSS与SSSS的功率是相等还是高3dB，从而可从确定两个功率可选值中的一个。比如PSSS的发射功率可选值分别为14dBm，16dBm，18dBm和20dBm。当第一终端设备将PSSS的发射功率设置为14dBm(对应k＝0)时，PSBCH的发射功率与PSSS的发射功率相等，且PSSS与SSSS的发射功率相等；当第一终端设备将PSSS的发射功率设置为16dBm(对应k＝1)时，PSBCH的发射功率与PSSS的发射功率相等，且PSSS比SSSS的发射功率高3dB；当第一终端设备将PSSS的发射功率设置为18dBm(对应k＝2)时，PSBCH的发射功率比PSSS的发射功率高3dB，且PSSS与SSSS的发射功率相等；当第一终端设备将PSSS的发射功率设置为20dBm(对应k＝3)时，PSBCH的发射功率比PSSS的发射功率高3dB，且PSSS比SSSS的发射功率高3dB。
又如第一终端设备还可以通过PSBCH的负载信息和PSBCH的DMRS序列指示第一数值。作为示例，如K＝8，对应3个bit的信息量，则第一终端设备可通过PSBCH的发射功率与PSSS的发射功率差值表示1个比特的信息量(二者相等或前者比后者高3dB)，剩余2个比特可通过PSBCH的负载信息和/或使用PSBCH的DMRS序列来指示。
可选的，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000008
Figure PCTCN2020071813-appb-000009
Figure PCTCN2020071813-appb-000010
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
Figure PCTCN2020071813-appb-000011
Figure PCTCN2020071813-appb-000012
其中，MPSSS为PSSS的带宽，MSSSS为PSSS的带宽，MPSBCH为PSBCH的带宽，MS-SSB为S-SSB的带宽。可理解，对于公式(19)至公式(23)中的其他参数的描述，可参考前述实施例，这里不再一一详述。可理解，本申请实施例中MPSSS具体可理解为PSSS在频域资源上占用的资源块(resource block，RB)或资源元素(resource element，RE)的数量，以及MSSSS可理解为SSSS在频域上占用的RB或RE数量，以及MPSBCH可理解为PSBCH在频域上占用的RB或RE数量。
该实施例可理解为S-SSB所包含的PSSS、SSSS和PSBCH所占用的每个资源块(resource block，RB)或每个资源元素(resource element，RE)的发射功率相同。
可理解，该实施例中，指示信息的指示方式可参考前述实施例，这里不再一一详述。如可通过PSBCH的负载信息指示，也可通过PSBCH的DMRS序列指示等等。也就是说，该实施例中，指示信息可包括PSBCH的负载信息和PSBCH的DMRS序列中的一项或多项。
可选的，第一数值还可表示S-SSB所在的第一OFDM符号的第一RE或第一RB上的发射功率。如图5a所示，S-SSB所在的第一OFDM符号的RE或RB不仅可包括第一RE或第一RB，还可能包括第二RE或第二RB等，因此，本实施例中所示出的第一RE或第一RB仅为一种示例，不应理解为对本实施例的限定。
其中，在第一数值表示S-SSB所在的第一OFDM符号的第一RE或第一RB上的发射功率的情况下，本申请实施例还可根据第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率是否相同，提供以下实施方式。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率相同的情况下，S-SSB的发射功率可满足如下公式：
P S-SSB＝10log 10(2 μ×M S-SSB)+P′ S-SSB   (24)
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
P′ S-SSB≤P S-SSB,MAX-10log 10(2 μ×M S-SSB)   (25)
P′ S-SSB≤P O_S-SSB,DL+α S-SSB,DL×PL DL  (26)
本实施例中，PS-SSB为S-SSB的发射功率，P′ S-SSB为第一数值，MS-SSB为S-SSB的带宽，PS-SSB,MAX为S-SSB的最大发射功率，PO_S-SSB,DL为一个RB或一个RE的目标接收功率，α S-SSB,DL为S-SSB的路损补偿因子。可理解，公式(24)和公式(25)中μ的取值可根据子载波间隔来确定。其中，MS-SSB可理解为该S-SSB在频域上占用的RB或RE数量。
可选的，在该实施例中，还可以不以S-SSB为单位规定发射功率，而是分别设置PSSS、SSSS以及 PSBCH的发射功率。因此，PSSS、SSSS以及PSBCH的发射功率可分别满足如下公式：
P PSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB   (27)
P SSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB   (28)
P PSBCH＝10log 10(2 μ×M S-SSB)+P′ S-SSB  (29)
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
P′ S-SSB≤min(P PSSS,MAX,P SSSS,MAX,P PSBCH,MAX)-10log 10(2 μ×M S-SSB)  (30)
Figure PCTCN2020071813-appb-000013
可理解，对于以上各个参数的具体描述，可参考前述实施例，这里不再一一详述。
可理解，本实施例中，由于第一数值所表示的是RE或RB上的发射功率，因此该第一数值可理解为是以RE或RB为粒度，从而来确定S-SSB的发射功率的参考值。如对于PSSS来说，每个RE或RB上的功率值为
Figure PCTCN2020071813-appb-000014
对于SSSS来说，每个RE或RB上的功率值为
Figure PCTCN2020071813-appb-000015
对于PSBCH来说，每个RE或RB上的功率值为
Figure PCTCN2020071813-appb-000016
该实施例中，第一信号即S-SSB的发射功率即为第一数值对应的功率值。
可理解，对于指示信息的指示方式可参考前述实施例，这里不再一一详述。如该指示信息可包括PSBCH的负载信息和PSBCH的DMRS序列中的一项或多项。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率可满足如下公式：
P PSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB+A   (32)
P SSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB+B   (33)
P PSBCH＝10log 10(2 μ×M S-SSB)+P′ S-SSB+C   (34)
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
P′ S-SSB≤min(P PSSS,MAX-A,P SSSS,MAX-B,P PSBCH,MAX-C)-10log 10(2 μ×M S-SSB)    (35)
Figure PCTCN2020071813-appb-000017
本实施例中，A、B和C分别表示偏移功率值，或者，也可称为偏移值(offset)。可选的，A、B和C可为预定义的，或者，也可由第一终端设备确定。可理解，该实施例中，第一信号即S-SSB的发射功率即为第一数值对应的功率值与偏移功率值的和。本实施例中，在A、B和C为预定义的情况下，指 示信息可包括PSBCH的负载信息和PSBCH的DMRS序列中的一项或多项。而A、B和C由第一终端设备确定的情况下，该指示信息可包括PSBCH、PSSS以及SSSS中至少两项的功率差值。
可理解，本实施例中，P′ S-SSB并不表示每个信号或信道(如PSBCH、PSSS、SSSS)在每个RE或RB上的功率值，而是表示确定发射功率的参考值。可理解，对于各个参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率还可满足如下公式：
P PSSS＝P′ S-SSB+10log 10(2 μ×M PSSS)   (37)
P SSSS＝P′ S-SSB+10log 10(2 μ×M SSSS)   (38)
P PSBCH＝P′ S-SSB+10log 10(2 μ×M PSBCH)    (39)
其中，P′ S-SSB不仅满足公式(6)，还满足如下公式：
Figure PCTCN2020071813-appb-000018
P′ S-SSB≤min(P O_PSSS,DL+α PSSS,DL×PL DL,P O_SSSS,DL+α SSSS,DL×PL DL,P O_PSBCH,DL+α PSBCH,DL×PL DL)(41)
本实施例可理解为S-SSB所占用的四个符号上每个RB或RE的发射功率相同。该实施例中，第一信号即S-SSB的发射功率为第一数值对应的功率值。以及该实施例中，指示信息可包括PSBCH的负载信息和PSBCH的DMRS序列中的一项或多项。对于该指示信息的具体描述，可参考前述实施例，这里不再一一详述。
可理解，对于各个参数的具体描述，可参考前述实施例，这里不再一一详述。
以上各个实施例是在图5a所示的S-SSB的结构下示出的，在具体实现中，该S-SSB还可能包括其他结构，图5b是本申请实施例提供的另一种S-SSB的结构示意图，如图5b所示，S-SSB在时域上可占用四个OFDM符号，与图5a不同的是，SSSS与PSBCH同时占用了一个OFDM符号。如图5b所示，也可将该S-SSB占用的OFDM符号划分为第一OFDM符号、第二OFDM符号、第三OFDM符号和第四OFDM符号，如PSSS占用的OFDM符号可称为第一OFDM符号、SSSS与PSBCH(2)占用的OFDM符号可称为第二OFDM符号，PSBCH(1)占用的两个OFDM符号可分别称为第三OFDM符号和第四OFDM符号。可理解，图5b所示的S-SSB的结构仅为一种示例，在具体实现中，PSSS、PSBCH与SSSS的带宽关系，本申请实施例不作限定，如PSSS与SSSS的带宽即可以相同，也可以不同等等。
可选的，第一数值可用于表示S-SSB所在的第一OFDM符号上的发射功率。其中，在第一数值表示S-SSB占用的第一OFDM符号上的发射功率的情况下，本申请实施例可根据第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率是否相同，提供以下实施方式。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率相同的情况下，S-SSB的发射功率可满足如下公式：
P PSSS＝P′ S-SSB   (42)
P PSBCH(1)＝P′ S-SSB   (43)
Figure PCTCN2020071813-appb-000019
Figure PCTCN2020071813-appb-000020
其中，PPSSS为PSSS的发射功率，PSSSS为SSSS的发射功率，PPSBCH(1)为PSBCH(1)的发射功率，PPSBCH(2)为PSBCH(2)的发射功率，P′ S-SSB为第一数值，MPSSS为PSSS的带宽，MSSSS为PSSS的带宽，MPSBCH为PSBCH的带宽。该实施例中，第一信号即S-SSB的发射功率即为第一数值所对应的功率值。
对于公式(44)和公式(45)来说，由于SSSS和PSBCH(2)同时占用了同一个OFDM符号。因此，第一终端设备在需要保证每个OFDM符号的发射功率相同的情况下，就需要对该同一个OFDM符号上的SSSS以及PSBCH进行功率折算，再确定各自的发射功率。
其中，P′ S-SSB不仅满足公式(6)，还满足公式(12)和公式(13)。
进一步地，在该实施例中，第一终端设备向第二终端设备发送的指示信息可包括以下至少一项：
1)PSBCH的负载信息；2)PSBCH的解调参考信号(demodulation reference signal，DMRS)的序列。
可理解，对于该指示信息的指示方式的具体实施方式可参考前述实施例，这里不再一一详述。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，SSSB的发射功率可满足如下公式：
P PSSS＝P′ S-SSB+A   (46)
P PSBCH(1)＝P′ S-SSB+B   (47)
Figure PCTCN2020071813-appb-000021
Figure PCTCN2020071813-appb-000022
其中，P′ S-SSB不仅满足公式(6)，还满足公式(17)和公式(18)。
其中，A、B和C分别表示偏移功率值，或者，也可称为偏移值(offset)。可选的，A、B和C可为预定义的，或者，也可由第一终端设备确定。可理解，该实施例中，第一信号即SSSB的发射功率即为第一数值对应的功率值与偏移功率值的和。
可理解，对于公式(46)至公式(49)中其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，在A、B和C为预定义的情况下，指示信息的指示方式如可通过PSBCH的负载信息指示，又或者通过PSBCH的DMRS序列指示等等，其详细描述可参考前述实施例，这里不再一一详述。
其中，在A、B和C由第一终端设备确定的情况下，第一终端设备可通过PSBCH、PSSS以及SSSS中至少两项的功率差值来指示第一数值。也就是说，该情况下，指示信息可通过PSBCH、PSSS以及SSSS中至少两项的功率差值来指示。
可选的，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000023
Figure PCTCN2020071813-appb-000024
Figure PCTCN2020071813-appb-000025
Figure PCTCN2020071813-appb-000026
其中，P′ S-SSB不仅满足公式(6)，还满足公式(22)和公式(23)。
该实施例中，SSSB所包含的PSSS、SSSS和PSBCH所占用的每个资源块(resource block，RB)或每个资源元素(resource element，RE)的发射功率可理解为是相同的。
可理解，该实施例中，对于其他参数的详细描述可参考公式(19)至公式(23)，这里不再一一详述。以及指示信息的指示方式可参考前述实施例，这里不再一一详述。如可通过PSBCH的负载信息指示，也可通过PSBCH的DMRS序列指示等等。
可选的，第一数值还可表示SSSB所在的第一OFDM符号的第一RE或第一RB上的发射功率。如图5b所示，S-SSB所在的第一OFDM符号的RE或RB不仅可包括第一RE或第一RB，还可能包括第二RE或第二RB等，因此，本实施例中所示出的第一RE或第一RB仅为一种示例，不应理解为对本实施例的限定。
其中，在第一数值表示SSSB所在的第一OFDM符号的第一RE或第一RB上的发射功率的情况下，本申请实施例还可根据第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率是否相同，提供以下实施方式。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率相同的情况下，S-SSB的发射功率可满足如下公式：
P PSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB  (54)
P PSBCH(1)＝10log 10(2 μ×M S-SSB)+P′ S-SSB   (55)
Figure PCTCN2020071813-appb-000027
Figure PCTCN2020071813-appb-000028
其中，P′ S-SSB不仅满足公式(6)，还满足公式(30)和公式(31)。
该实施例中，第一信号即S-SSB的发射功率即为第一数值对应的功率值。
可理解，对于指示信息的指示方式可参考前述实施例，这里不再一一详述。如该指示信息可包括PSBCH的负载信息和PSBCH的DMRS序列中的一项或多项。
可理解，对于该实施例中各个参数的具体描述可参考前述实施例，这里不再赘述。
本申请的一些实施例中，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率可满足如下公式：
P PSSS＝10log 10(2 μ×M S-SSB)+P′ S-SSB+A   (58)
P PSBCH(1)＝10log 10(2 μ×M S-SSB)+P′ S-SSB+B   (59)
Figure PCTCN2020071813-appb-000029
Figure PCTCN2020071813-appb-000030
其中，P′ S-SSB不仅满足公式(6)，还满足公式(35)和公式(36)。
可理解，该实施例的详细描述，可参考公式(32)至公式(36)的相关描述，这里不再一一详述。
可选的，在第一OFDM符号、第二OFDM符号和第三OFDM符号上的发射功率不完全相同的情况下，S-SSB的发射功率还可满足如下公式：
P PSSS＝P′ S-SSB+10log 10(2 μ×M PSSS)   (62)
P PSBCH(1)＝P′ S-SSB+10log 10(2 μ×M PSBCH)   (63)
Figure PCTCN2020071813-appb-000031
Figure PCTCN2020071813-appb-000032
其中，P′ S-SSB不仅满足公式(6)，还满足公式(40)和公式(41)。
可理解，该实施例的详细描述，可参考公式(37)至公式(41)的相关描述，这里不再一一详述。
进一步地，在第一终端设备根据以上具体实施方式确定了S-SSB的发射功率后，便可根据该S-SSB的发射功率向第二终端设备发送S-SSB以及指示信息，该第二终端设备接收到该S-SSB以及该指示信息后，便可确定第一终端设备与第二终端设备之间的路径损耗估计值。具体的，在第二终端设备确定了第一终端设备与第二终端设备之间的路径损耗估计值PLSL之后，该第二终端设备便可根据该PLSL向第一终端设备发送第二信号。接下来，详细描述第二终端设备确定第二信号的发射功率的方法。
本申请的一些实施例中，如第二信号可包括物理直连链路共享信道(physical sidelink shared channel，PSSCH)。该情况下，该PSSCH的发射功率可满足如下公式：
P PSSCH＝min[P PSSCH,MAX,10log 10(2 μ×M PSSCH)+P O_PSSCH,1+α PSSCH,1×PL SL]    (66)
其中，PPSSCH为PSSCH的发射功率；PPSSCH,MAX为PSSCH的最大发射功率；MPSSCH为PSSCH的带宽；PO_PSSCH,1为PSSCH的目标接收功率，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；α PSSCH,1为路损补偿因子，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。
可选的，PSSCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000033
其中，PO_PSSCH,1为PSSCH的目标接收功率，该值可以由基站配置，还可以由高层协商指示，或者还可以为预定义的；α PSSCH,1为路径损耗因子，该值可以由基站配置，还可以由高层协商指示，还可以为预定义的；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。PO_PSSCH,2为PSSCH的目标接收功率，该值可以由基站配置；α PSSCH,2为路径损耗因子，该值可以由基站配置；PLDL为基站与第二终端设备之间的路径损耗估计值。
通过公式(67)来确定PSCCH的发射功率，还可以约束PSCCH的发射功率，避免对上行信号造成干扰，保证了传输的可靠性。
可选的，PSSCH的发射功率还可满足如下公式：
P PSSCH＝min(P PSSCH,MAX,10log 10(2 μ×M PSSCH)+P O_PSSCH,1+α PSSCH,1×PL SL+f PSSCH)    (68)
其中，f PSSCH为调整参数，可以由基站通过DCI指示，还可以由第二终端设备指示等等。可理解，该实施例采用了闭环功率控制来确定第二信号的发射功率。对于公式(68)中的其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，PSSCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000034
其中，该实施例中不仅采用了闭环功率控制来确定第二信号的发射功率，还可根据基站与第二终端设备之间的路径损耗估计值来确定第二信号的发射功率，进一步确定第二信号的发射功率，不仅通过直连链路之间的路径损耗估计值来确定，还避免了对上行信号的干扰，保证了信号传输的可靠性。
本申请的一些实施例中，如第二信号还可包括物理直连链路控制信道(physical sidelink control channel，PSCCH)。该情况下，该PSCCH的发射功率可满足如下公式：
P PSCCH＝min(P PSCCH,MAX,10log 10(2 μ×M PSCCH)+P O_PSCCH,1+α PSCCH,1×PL SL)    (70)
其中，PPSCCH为PSCCH的发射功率；PPSCCH,MAX为PSCCH的最大发射功率；MPSCCH为PSCCH的带宽；PO_PSCCH,1为PSCCH的目标接收功率，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；α PSCCH,1为路损补偿因子，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。
可选的，PSCCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000035
其中，PO_PSCCH,1为PSCCH的目标接收功率，该值可以由基站配置，还可以由高层协商指示，或者还可以为预定义的；α PSCCH,1为路径损耗因子，该值可以由基站配置，还可以由高层协商指示，还可以为预定义的；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。PO_PSCCH,2为PSCCH的目标接收功率，该值可以由基站配置；α PSCCH,2为路径损耗因子，该值可以由基站配置；PLDL为基站与第二终端设备之间的路径损耗估计值。
可选的，PSCCH的发射功率还可满足如下公式：
P PSCCH＝min(P PSCCH,MAX,10log 10(2 μ×M PSCCH)+P O_PSCCH,1+α PSCCH,1×PL SL+f PSCCH)    (72)
其中，f PSCCH为调整参数，可以由基站通过DCI指示，还可以由第二终端设备指示等等。可理解，该实施例采用了闭环功率控制来确定第二信号的发射功率。对于公式(72)中的其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，PSCCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000036
可理解，关于PSCCH的具体实施方式可参考前述实施例的描述，这里不再一一详述。
本申请的一些实施例中，如第二信号还可包括物理直连链路反馈信道(physical sidelink feedback  channel，PSFCH)。可理解，该PSFCH在具体实现中，可能还包括其他名称，因此，本申请实施例对于该PSFCH的名称不作唯一性限定。该情况下，该PSFCH的发射功率可满足如下公式：
P PSFCH＝min(P PSFCH,MAX,10log 10(2 μ×M PSFCH)+P O_PSFCH,1+α PSFCH,1×PL SL)   (74)
其中，PPSFCH为PSFCH的发射功率；PPSFCH,MAX为PSFCH的最大发射功率；MPSFCH为PSFCH的带宽；PO_PSFCH,1为PSFCH的目标接收功率，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；α PSFCH,1为路损补偿因子，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。
可选的，PSFCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000037
其中，PO_PSFCH,1为PSFCH的目标接收功率，该值可以由基站配置，还可以由高层协商指示，或者还可以为预定义的；α PSFCH,1为路径损耗因子，该值可以由基站配置，还可以由高层协商指示，还可以为预定义的；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。PO_PSFCH,2为PSFCH的目标接收功率，该值可以由基站配置；α PSFCH,2为路径损耗因子，该值可以由基站配置；PLDL为基站与第二终端设备之间的路径损耗估计值。
可选的，PSFCH的发射功率还可满足如下公式：
P PSFCH＝min(P PSFCH,MAX,10log 10(2 μ×M PSFCH)+P O_PSFCH,1+α PSFCH,1×PL SL+f PSFCH)   (76)
其中，f PSFCH为调整参数，可以由基站通过DCI指示，还可以由第二终端设备指示等等。可理解，该实施例采用了闭环功率控制来确定第二信号的发射功率。对于公式(76)中的其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，PSFCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000038
可理解，关于PSFCH的具体实施方式可参考前述实施例的描述，这里不再一一详述。
本申请的一些实施例中，如第二信号还可包括物理直连链路发现信道(physical sidelink discovery channel，PSDCH)。该情况下，该PSDCH的发射功率可满足如下公式：
P PSDCH＝min(P PSDCH,MAX,10log 10(2 μ×M PSDCH)+P O_PSDCH,1+α PSDCH,1×PL SL)   (78)
其中，PPSDCH为PSDCH的发射功率；PPSDCH,MAX为PSDCH的最大发射功率；MPSDCH为PSDCH的带宽；PO_PSDCH,1为PSDCH的目标接收功率，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；α PSDCH,1为路损补偿因子，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。
可选的，PSDCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000039
其中，PO_PSDCH,1为PSDCH的目标接收功率，该值可以由基站配置，还可以由高层协商指示，或者还可以为预定义的；α PSDCH,1为路径损耗因子，该值可以由基站配置，还可以由高层协商指示，还可以为预定义的；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。PO_PSDCH,2为PSDCH的 目标接收功率，该值可以由基站配置；α PSDCH,2为路径损耗因子，该值可以由基站配置；PLDL为基站与第二终端设备之间的路径损耗估计值。
可选的，PSDCH的发射功率还可满足如下公式：
P PSDCH＝min(P PSDCH,MAX,10log 10(2 μ×M PSDCH)+P O_PSDCH,1+α PSDCH,1×PL SL+f PSDCH)  (80)
其中，f PSDCH为调整参数，可以由基站通过DCI指示，还可以由第二终端设备指示等等。可理解，该实施例采用了闭环功率控制来确定第二信号的发射功率。对于公式(80)中的其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，PSDCH的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000040
可理解，对于PSDCH的具体描述，可参考PSCCH或PSDCH或PSFCH的对应描述，这里不再一一详述。
本申请的一些实施例中，如第二信号还可包括物理直连链路信道状态参考信号(sidelink channel state information reference signal，S-CSI-RS)。该情况下，该PSDCH的发射功率可满足如下公式：
P S-CSI-RS＝min(P S-CSI-RS,MAX,10log 10(2 μ×M S-CSI-RS)+P O_S-CSI-RS,1+α S-CSI-RS,1×PL SL)  (82)
其中，PS-CSI-RS为S-CSI-RS的发射功率；PS-CSI-RS,MAX为S-CSI-RS的最大发射功率；MS-CSI-RS为S-CSI-RS的带宽；PO_S-CSI-RS,1为S-CSI-RS的目标接收功率，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；α S-CSI-RS,1为路损补偿因子，该值可由基站配置，或者该值可以是预定义的，或者还可以由高层协商指示；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。
可选的，S-CSI-RS的发射功率还可满足如下公式：
P S-CSI-RS＝min(P S-CSI-RS,MAX,10log 10(2 μ×M S-CSI-RS)+P O_S-CSI-RS,1+α S-CSI-RS,1×PL SL,
10log 10(2 μ×M S-CSI-RS)+P O_S-CSI-RS,2+α S-CSI-RS,2×PL DL)
(83)其中，PO_S-CSI-RS,1为S-CSI-RS的目标接收功率，该值可以由基站配置，还可以由高层协商指示，或者还可以为预定义的；α S-CSI-RS,1为路径损耗因子，该值可以由基站配置，还可以由高层协商指示，还可以为预定义的；PLSL为第一终端设备与第二终端设备之间的路径损耗估计值。PO_S-CSI-RS,2为S-CSI-RS的目标接收功率，该值可以由基站配置；α S-CSI-RS,2为路径损耗因子，该值可以由基站配置；PLDL为基站与第二终端设备之间的路径损耗估计值。
可选的，S-CSI-RS的发射功率还可满足如下公式：
P S-CSI-RS＝min(P S-CSI-RS,MAX,10log 10(2 μ×M S-CSI-RS)+P O_S-CSI-RS,1+α S-CSI-RS,1×PL SL+f S-CSI-R S)(84)
其中，f S-CSI-RS为调整参数，可以由基站通过DCI指示，还可以由第二终端设备指示等等。可理解，该实施例采用了闭环功率控制来确定第二信号的发射功率。对于公式(76)中的其他参数的具体描述，可参考前述实施例，这里不再一一详述。
可选的，S-CSI-RS的发射功率还可满足如下公式：
Figure PCTCN2020071813-appb-000041
可理解，对于S-CSI-RS的具体描述，可参考PSCCH或PSDCH或PSFCH的对应描述，这里不再一一详述。
可理解，以上所示出的第二信号仅为一种示例，在具体实现中，可能还包括其他信号，这里不再一一详述。
在第二终端设备根据以上各个信号的发射功率确定了第二信号的发射功率之后，便可向第一终端设备发送第二信号。
需要说明的是，本申请所示出的各个实施例中的公式的单位未详细说明，可理解前述各个实施例中各个信号或信道的发射功率的单位为dBm。
可理解，以上是以第一信号为S-SSB为例的情况下，描述的本申请实施例所提供的功率控制方法。即以上所示的功率控制方法是以第一信号包括S-SSB为例，第一终端设备如何向第二终端设备发送指示信息以及第一信号，且以第二信号包括PSSCH、PSCCH、PSFCH、PSDCH和S-CSI-RS为例，第二终端设备如何向第一终端设备发送第二信号。然而，在具体实现中，该第一信号还可能包括其他信号。
作为示例，该第一信号还可包括PSSCH。在该第一信号包括PSSCH的情况下，指示信息可包括PSSCH的DMRS序列。也就是说，可以将第一数值通过PSSCH的DMRS序列来指示。从而第二终端设备在接收到该PSSCH后，根据该PSSCH的发射功率以及接收功率来确定第一终端设备与第二终端设备之间的路径损耗估计值。继而该第二终端设备便可根据该第一终端设备与该第二终端设备之间的路径损耗估计值确定第二信号的发射功率。其中，该第二信号的发射功率所满足的公式或条件可参考前述实施例，这里不再一一详述。
作为示例，该第一信号还可包括PSCCH。在该第一信号包括PSCCH的情况下，指示信息可包括PSCCH的DMRS序列。也就是说，可以将第一数值通过PSCCH的DMRS序列来指示。从而第二终端设备在接收到该PSCCH后，根据该PSCCH的发射功率以及接收功率来确定第一终端设备与第二终端设备之间的路径损耗估计值。继而该第二终端设备便可根据该第一终端设备与该第二终端设备之间的路径损耗估计值确定第二信号的发射功率。其中，该第二信号的发射功率所满足的公式或条件可参考前述实施例，这里不再一一详述。
作为示例，该第一信号还可包括PSFCH。在该第一信号包括PSFCH的情况下，指示信息可包括PSFCH的DMRS序列。也就是说，可以将第一数值通过PSFCH的DMRS序列来指示。从而第二终端设备在接收到该PSFCH后，根据该PSFCH的发射功率以及接收功率来确定第一终端设备与第二终端设备之间的路径损耗估计值。继而该第二终端设备便可根据该第一终端设备与该第二终端设备之间的路径损耗估计值确定第二信号的发射功率。其中，该第二信号的发射功率所满足的公式或条件可参考前述实施例，这里不再一一详述。
作为示例，该第一信号还可包括C-SCI-RS。由于S-CSI-RS本身就是一个参考信号，不像其他信道那样可以携带指示信息，因此可以通过该S-CSI-RS使用的序列来进行指示。如S-CSI-RS有四种可选序列，每种序列可以表示一种发射功率。也就是说，S-CSI-RS的四种可选序列可与K个(即4个)可选功率值一一对应。或者第一终端设备还可以通过高层信令(如RRC信令或MAC CE信令)指示S-CSI-RS的发射功率，然而由于高层信令每次传输产生的时延比较大，因此该情况下S-CSI-RS的发射功率可以不是动态变化的，而是半静态的。
可理解，以上所示出的实施例均是在单播的情况下示出的，即是在一个第一终端设备向一个第二终端设备发送第一信号的情况下示出的。然而，在具体实现中，可能会有多个终端设备向第二终端设备发 送第一信号，即终端设备集合中的终端设备向第二终端设备发送第一信号，该情况下，作为示例，第二终端设备可分别确定出终端设备集合中的每个终端设备与第二终端设备之间的路径损耗估计值，得到路径损耗估计值集合。然后第二终端设备可从该路径损耗估计值集合中确定出最大的路径损耗估计值，从而根据该最大的路径损耗估计值来确定第二信号的发射功率。
其中，该终端设备集合可理解为组播集合中的终端设备，或多播集合中的终端设备。如该终端设备集合可理解为与第二终端设备已经建立连接的终端设备组成的集合。该实施例中，由于是根据最大的路径损耗估计值来确定第二信号的发射功率，因此可有效保证终端设备集合中的每个终端设备都能够接收到第二信号，保证了信号传输的可靠性。
可选的，该终端设备集合还可以理解为组播集合中，且与第二终端设备的距离在参考范围内的终端设备组成的集合。如该终端设备集合可理解为与第二终端设备已经建立连接的终端设备组成的集合，且该终端设备集合中的终端设备与第二终端设备的距离在参考范围内。该实施例中，可避免由于组播集合或多播集合中的某个终端设备距离第二终端设备过远，而采用很高的发射功率发射第二信号，从而对其他终端设备造成干扰的情况。也就是说，该实施例中，可保证参考范围内的终端设备传输信号的可靠性。
可理解，本实施例中，该参考范围可基站配置，或者为预定义的，或者由高层确定等等，本申请实施例对于该参考范围具体所包括的范围不作限定。
可理解，至于终端设备集合中的终端设备如何向第二终端设备发送第一信号，以及第二终端设备如何向终端设备集合中的终端设备发送第二信号的具体实施方式，可参考前述各个实施例，这里不再一一详述。
以上示出了本申请实施例所提供的功率控制方法，接下来将详细描述本申请实施例中的功率控制装置，该装置可用于执行本申请实施例所描述的方法，该装置可以是终端设备(如第一终端设备或第二终端设备)，或者是终端设备中实现上述功能的部件，或者是芯片。以下以终端设备为例来说明该功率控制装置。
图6是本申请实施例提供的一种功率控制装置的结构示意图，可选的，该功率控制装置可作为第一终端设备使用，且该功率控制装置可用于执行本申请实施例所描述的方法，如图6所示，该功率控制装置包括：
处理单元601，用于根据第一数值确定第一信号的发射功率；其中，上述第一数值为参考数值集合中的一个数值，上述参考数值集合中包括至少两个功率值，且上述第一数值不超过第一功率，上述第一功率根据上述第一信号的最大发射功率确定；
发送单元602，用于向第二终端设备发送指示信息，上述指示信息用于指示或包括上述第一数值；上述发送单元，还用于以上述第一信号的发射功率向上述第二终端设备发送上述第一信号。
本申请实施例中，第一终端设备通过向第二终端设备指示第一数值，可使得第二终端设备根据该第一数值得到第一终端设备与第二终端设备之间的路径损耗估计值，从而使得该第二终端设备有效地确定直连链路传输时信号的发射功率，提高了终端设备之间信号传输的可靠性。
可选的，上述第一数值不超过第二功率，上述第二功率根据网络设备与上述第一终端设备之间的路径损耗估计值确定。
可选的，上述参考数值集合由上述网络设备配置；或者，上述参考数值集合为预定义的；或者，上述参考数值集合由上述第一终端设备的高层确定。
可选的，上述第一数值用于表示上述第一信号所在的第一正交频分复用OFDM符号上的发射功率；或者，上述第一数值用于表示上述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；或 者，上述第一数值用于表示上述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
可选的，上述第一信号的发射功率为上述第一数值对应的功率值；或者，上述第一信号的发射功率为上述第一数值对应的功率值与偏移功率值的和。
可选的，上述偏移功率值为预定义的，或者，上述偏移功率值由上述第一终端设备确定。
可选的，上述第一信号包括直连链路同步信号块SSSB，且上述SSSB中包括物理直连链路广播信道PSBCH、主直连链路同步信号PSSS以及辅直连链路同步信号SSSS；其中，上述指示信息包括以下至少一项：上述PSBCH的负载信息；上述PSBCH的解调参考信号DMRS的序列；上述PSBCH、上述PSSS以及上述SSSS中至少两项的功率差值。
可选的，在上述指示信息包括上述PSBCH、上述PSSS以及上述SSSS中至少两项的功率差值时，上述第一数值与上述功率差值有映射关系；其中，上述映射关系由上述网络设备配置；或者，上述映射关系为预定义的；或者，上述映射关系由上述第一终端设备的高层确定。
可选的，上述第一信号包括物理直连链路共享信道PSSCH，且上述指示信息携带于上述PSSCH中；或者，上述第一信号包括物理直连链路控制信道PSCCH，且上述指示信息携带于上述PSCCH中；或者，上述第一信号包括物理直连链路反馈信道PSFCH，且上述指示信息携带于上述PSFCH中。
可选的，上述第一信号包括参考信号，且上述指示信息包括上述参考信号的序列，上述参考信号用于确定上述第一终端设备与上述第二终端设备之间的信道状态信息。
可选的，如图6所示，上述功率控制装置还包括：
接收单元603，用于接收来自上述第二终端设备的第二信号；其中，上述第二信号的发射功率根据上述第一终端设备与上述第二终端设备之间的路径损耗估计值确定，上述第一终端设备与上述第二终端设备之间的路径损耗估计值根据上述第一信号的发射功率以及上述第一信号的接收功率确定。
可选的，发送单元602和接收单元603可能集成于一个器件中，如该发送单元602和接收单元603可能为收发器。或者，发送单元602和接收单元603也可能分离为不同的器件，本申请对于发送单元602和接收单元603的具体方式不作限定。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数，上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PO_1为目标功率，上述α 1为路损补偿因子，上述f为调整参数。
可选的，上述第二信号的发射功率根据上述第一终端设备与上述第二终端设备之间的路径损耗估计值以及上述网络设备与上述第二终端设备之间的路径损耗估计值确定。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数，上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PLDL为上述网络设备与上述第二终端设备之间的路径损耗估计值，上述PO_1与上述PO_2为目标功率，上述α 1和上述α 2为路损补偿因子。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数， 上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PLDL为上述网络设备与上述第二终端设备之间的路径损耗估计值，上述PO_1与上述PO_2为目标功率，上述α 1和上述α 2为路损补偿因子，上述f为调整参数。
需要理解的是，当上述功率控制装置是终端设备或终端设备中实现上述功能的部件时，处理单元601可以是一个或多个处理器，发送单元602可以是发送器，接收单元603可以是接收器，或者发送单元602和接收单元603集成于一个器件，例如收发器。当上述功率控制装置是芯片时，处理单元601可以是一个或多个处理器，发送单元602可以是输出接口，接收单元603可以是输入接口，或者发送单元602和接收单元603集成于一个单元，例如输入输出接口。
图7是本申请实施例提供的另一种功率控制装置的结构示意图，可选的，该功率控制装置可作为第二终端设备使用，且该功率控制装置可用于执行本申请实施例所描述的方法，如图7所示，该功率控制装置包括：
接收单元701，用于接收来自第一终端设备的第一信号以及指示信息；其中，上述指示信息用于指示或包括第一数值，上述第一数值为参考数值集合中的一个数值，上述参考数值集合中包括至少两个功率值，且上述第一数值不超过第一功率，上述第一功率根据上述第一信号的最大发射功率确定；
处理单元702，用于根据上述指示信息以及上述第一信号的接收功率确定上述第一终端设备与上述第二终端设备之间的路径损耗估计值。
可选的，上述第一数值不超过第二功率，上述第二功率根据网络设备与上述第一终端设备之间的路径损耗估计值确定。
可选的，上述处理单元702，还用于根据上述第一终端设备与上述第二终端设备之间的路径损耗估计值确定第二信号的发射功率；
如图7所示，上述功率控制装置还包括：
发送单元703，用于以上述第二信号的发射功率向上述第一终端设备发送上述第二信号。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数，上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PO_1为目标功率，上述α 1为路损补偿因子，上述f为调整参数。
可选的，上述处理单元702，具体用于根据上述第一终端设备与上述第二终端设备之间的路径损耗估计值以及上述网络设备与上述第二终端设备之间的路径损耗估计值确定上述第二信号的发射功率。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数，上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PLDL为上述网络设备与上述第二终端设备之间的路径损耗估计值，上述PO_1与上述PO_2为目标功率，上述α 1和上述α 2为路损补偿因子。
可选的，上述第二信号的发射功率满足如下公式：
P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
其中，上述PCMAX_2为上述第二信号的最大发射功率，上述y(M)为上述第二信号的带宽的函数，上述PLSL为上述第一终端设备与上述第二终端设备之间的路径损耗估计值，上述PLDL为上述网络设备 与上述第二终端设备之间的路径损耗估计值，上述PO_1与上述PO_2为目标功率，上述α 1和上述α 2为路损补偿因子，上述f为调整参数。
可选的，上述第一终端设备包括终端设备集合中与上述第二终端设备之间的路径损耗估计值最大的终端设备。
可选的，上述终端设备集合为与上述第二终端设备已经建立连接的终端设备组成的集合；或者上述终端设备集合为与上述第二终端设备已经建立连接，且与上述第二终端设备距离在参考范围内的终端设备组成的集合。
需要理解的是，当上述功率控制装置是终端设备或终端设备中实现上述功能的部件时，处理单元702可以是一个或多个处理器，发送单元703可以是发送器，接收单元701可以是接收器，或者发送单元703和接收单元701集成于一个器件，例如收发器。当上述功率控制装置是芯片时，处理单元702可以是一个或多个处理器，发送单元703可以是输出接口，接收单元701可以是输入接口，或者发送单元703和接收单元701集成于一个单元，例如输入输出接口。
可理解，对于图6和图7所示的功率控制装置的具体实施方式，可参考前述实施例，这里不再一一详述。
图8为本申请实施例提供的一种终端设备800的结构示意图。该终端设备可执行如图4所示出的方法，或者，该终端设备也可执行如图6和图7所示的功率控制装置的操作。
为了便于说明，图8仅示出了终端设备的主要部件。如图8所示，终端设备800包括处理器、存储器、射频链路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端设备执行图4所描述的流程。存储器主要用于存储软件程序和数据。射频链路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。终端设备800还可以包括输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频链路，射频链路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频链路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图8仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器(central processing unit，CPU)，基带处理器主要用于对通信协议以及通信数据进行处理，CPU主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。可选的，该处理器还可以是网络处理器(network processor，NP)或者CPU和NP的组合。处理器还可以进一步包括硬件芯片。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合。存储器可以包括易失性存储器(volatile memory)，例如随机存取存储器 (random-access memory，RAM)；存储器也可以包括非易失性存储器(non-volatile memory)，例如快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)；存储器还可以包括上述种类的存储器的组合。
示例性的，在申请实施例中，可以将具有收发功能的天线和射频链路视为终端设备800的收发单元801，将具有处理功能的处理器视为终端设备800的处理单元802。
如图8所示，终端设备800可以包括收发单元801和处理单元802。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元801中用于实现接收功能的器件视为接收单元，将收发单元801中用于实现发送功能的器件视为发送单元，即收发单元801包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
在一些实施例中，收发单元801、处理单元802可能集成为一个器件，也可以分离为不同的器件，此外，处理器与存储器也可以集成为一个器件，或分立为不同器件。例如，在一个实施例中，收发单元801可用于执行图4所示的步骤402和步骤403所示的方法。又如，在一个实施例中，收发单元801可用于执行图4所示的步骤406所示的方法。
又如，在一个实施例中，处理单元802可用于执行控制收发单元801执行图4所示的步骤402和步骤403所示的方法。又如，在一个实施例中，该处理单元802可用于控制收发单元801执行图4所示的步骤406所示的方法。
又如，在一个实施例中，处理单元802还可用于执行图4所示的步骤401所示的方法。又如，在一个实施例中，处理单元802可用于执行图4所示的步骤404和405所示的方法。
又如，在一个实施例中，收发单元801可用于执行发送单元602和接收单元603所示的方法。又如，在一个实施例中，处理单元802可用于执行处理单元601所示的方法。
又如，在一个实施例中，收发单元801可用于执行接收单元701和发送单元703所示的方法。又如，在一个实施例中，处理单元802可用于执行处理单元702所示的方法。
可理解的是，本申请实施例中的终端设备的实现方式，具体可参考前述各个实施例，这里不再详述。
本申请实施例还提供了一种计算机可读存储介质。上述方法实施例中的全部或者部分流程可以由计算机程序来指令相关的硬件完成，该程序可存储于上述计算机存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。计算机可读存储介质可以是前述任一实施例的功率控制装置(包括第一终端设备和/或第二终端设备)的内部存储单元，例如功率控制装置的硬盘或内存。上述计算机可读存储介质也可以是上述功率控制装置的外部存储设备，例如上述功率控制装置上配备的插接式硬盘，智能存储卡(smart media card,SMC)，安全数字(secure digital,SD)卡，闪存卡(flash card)等。进一步地，上述计算机可读存储介质还可以既包括上述功率控制装置的内部存储单元也包括外部存储设备。上述计算机可读存储介质用于存储上述计算机程序以及上述功率控制装置所需的其他程序和数据。上述计算机可读存储介质还可以用于暂时地存储已经输出或者将要输出的数据。
在上述实施例中，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申请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、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，或者通过所述计算机可读存储介质进行传输。所述计算机可读存储介质可以是计算机能够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，DVD)、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本申请实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本申请实施例装置中的模块可以根据实际需要进行合并、划分和删减。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (53)

  1. 一种功率控制方法，包括：
    第一终端设备根据第一数值确定第一信号的发射功率；其中，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；
    所述第一终端设备向第二终端设备发送指示信息，所述指示信息用于指示或包括所述第一数值；
    所述第一终端设备以所述第一信号的发射功率向所述第二终端设备发送所述第一信号。
  2. 根据权利要求1所述的方法，其中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
  3. 根据权利要求1或2所述的方法，其中，所述参考数值集合由所述网络设备配置；
    或者，所述参考数值集合为预定义的；
    或者，所述参考数值集合由所述第一终端设备的高层确定。
  4. 根据权利要求1至3任一项所述的方法，其中，所述第一数值用于表示所述第一信号所在的第一正交频分复用OFDM符号上的发射功率；
    或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；
    或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
  5. 根据权利要求4所述的方法，其中，所述第一信号的发射功率为所述第一数值对应的功率值；
    或者，所述第一信号的发射功率为所述第一数值对应的功率值与偏移功率值的和。
  6. 根据权利要求5所述的方法，其中，所述偏移功率值为预定义的，或者，所述偏移功率值由所述第一终端设备确定。
  7. 根据权利要求1至6任一项所述的方法，其中，所述第一信号包括直连链路同步信号块SSSB，且所述SSSB中包括直连链路物理广播信道PSBCH、直连链路主同步信号PSSS以及直连链路辅同步信号SSSS；
    其中，所述指示信息包括以下至少一项：
    所述PSBCH的负载信息；
    所述PSBCH的解调参考信号DMRS的序列；
    所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值。
  8. 根据权利要求7所述的方法，其中，在所述指示信息包括所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值时，所述第一数值与所述功率差值有映射关系；
    其中，所述映射关系由所述网络设备配置；
    或者，所述映射关系为预定义的；
    或者，所述映射关系由所述第一终端设备的高层确定。
  9. 根据权利要求1至6任一项所述的方法，其中，所述第一信号包括物理直连链路共享信道PSSCH，且所述指示信息携带于所述PSSCH中；
    或者，所述第一信号包括物理直连链路控制信道PSCCH，且所述指示信息携带于所述PSCCH 中；
    或者，所述第一信号包括物理直连链路反馈信道PSFCH，且所述指示信息携带于所述PSFCH中。
  10. 根据权利要求1至6任一项所述的方法，其中，所述第一信号包括参考信号，且所述指示信息包括所述参考信号的序列，所述参考信号用于确定所述第一终端设备与所述第二终端设备之间的信道状态信息。
  11. 根据权利要求1至10任一项所述的方法，其中，所述第一终端设备以所述第一信号的发射功率向所述第二终端设备发送所述第一信号之后，所述方法还包括：
    所述第一终端设备接收来自所述第二终端设备的第二信号；其中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定，所述第一终端设备与所述第二终端设备之间的路径损耗估计值根据所述第一信号的发射功率以及所述第一信号的接收功率确定。
  12. 根据权利要求11所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
  13. 根据权利要求11任一项所述的方法，其中，所述第二信号的发射功率根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定。
  14. 根据权利要求13任一项所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
  15. 根据权利要求13任一项所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
  16. 一种功率控制方法，包括：
    第二终端设备接收来自第一终端设备的第一信号以及指示信息；其中，所述指示信息用于指示或包括第一数值，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；
    所述第二终端设备根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与 所述第二终端设备之间的路径损耗估计值。
  17. 根据权利要求16所述的方法，其中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
  18. 根据权利要求16或17所述的方法，其中，所述第二终端设备根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与第二终端设备之间的路径损耗估计值之后，所述方法还包括：
    所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率；
    所述第二终端设备以所述第二信号的发射功率向所述第一终端设备发送所述第二信号。
  19. 根据权利要求18所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
  20. 根据权利要求18所述的方法，其中，所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值确定第二信号的发射功率，包括：
    所述第二终端设备根据所述第一终端设备与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定所述第二信号的发射功率。
  21. 根据权利要求20所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
  22. 根据权利要求20所述的方法，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
  23. 根据权利要求16至22任一项所述的方法，其中，所述第一终端设备包括终端设备集合中与所述第二终端设备之间的路径损耗估计值最大的终端设备。
  24. 根据权利要求23所述的方法，其特征在于，所述终端设备集合为与所述第二终端设备已经建立连接的终端设备组成的集合；或者所述终端设备集合为与所述第二终端设备已经建立连接，且与所述第二终端设备距离在参考范围内的终端设备组成的集合。
  25. 一种通信装置，包括：
    用于根据第一数值确定第一信号的发射功率的装置；其中，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述 第一功率根据所述第一信号的最大发射功率确定；
    用于向第二终端设备发送指示信息，所述指示信息用于指示或包括所述第一数值的装置；
    用于以所述第一信号的发射功率向所述第二终端设备发送所述第一信号的装置。
  26. 根据权利要求25所述的通信装置，其中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述通信装置之间的路径损耗估计值确定。
  27. 根据权利要求25或26所述的通信装置，其中，所述参考数值集合由所述网络设备配置；
    或者，所述参考数值集合为预定义的；
    或者，所述参考数值集合由所述通信装置的高层确定。
  28. 根据权利要求25至27任一项所述的通信装置，其中，所述第一数值用于表示所述第一信号所在的第一正交频分复用OFDM符号上的发射功率；
    或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源元素RE上的发射功率；
    或者，所述第一数值用于表示所述第一信号所在的第一OFDM符号的第一资源块RB上的发射功率。
  29. 根据权利要求8所述的通信装置，其中，所述第一信号的发射功率为所述第一数值对应的功率值；
    或者，所述第一信号的发射功率为所述第一数值对应的功率值与偏移功率值的和。
  30. 根据权利要求29所述的通信装置，其中，所述偏移功率值为预定义的，或者，所述偏移功率值由所述通信装置确定。
  31. 根据权利要求25至30任一项所述的通信装置，其中，所述第一信号包括直连链路同步信号块SSSB，且所述SSSB中包括直连链路物理广播信道PSBCH、直连链路主同步信号PSSS以及直连链路辅同步信号SSSS；
    其中，所述指示信息包括以下至少一项：
    所述PSBCH的负载信息；
    所述PSBCH的解调参考信号DMRS的序列；
    所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值。
  32. 根据权利要求31所述的通信装置，其中，在所述指示信息包括所述PSBCH、所述PSSS以及所述SSSS中至少两项的功率差值时，所述第一数值与所述功率差值有映射关系；
    其中，所述映射关系由所述网络设备配置；
    或者，所述映射关系为预定义的；
    或者，所述映射关系由所述通信装置的高层确定。
  33. 根据权利要求25至30任一项所述的通信装置，其中，所述第一信号包括物理直连链路共享信道PSSCH，且所述指示信息携带于所述PSSCH中；
    或者，所述第一信号包括物理直连链路控制信道PSCCH，且所述指示信息携带于所述PSCCH中；
    或者，所述第一信号包括物理直连链路反馈信道PSFCH，且所述指示信息携带于所述PSFCH中。
  34. 根据权利要求25至30任一项所述的通信装置，其中，所述第一信号包括参考信号，且所述指示信息包括所述参考信号的序列，所述参考信号用于确定所述通信装置与所述第二终端设 备之间的信道状态信息。
  35. 根据权利要求25至34任一项所述的通信装置，还包括：
    用于接收来自所述第二终端设备的第二信号的装置；其中，所述第二信号的发射功率根据所述通信装置与所述第二终端设备之间的路径损耗估计值确定，所述通信装置与所述第二终端设备之间的路径损耗估计值根据所述第一信号的发射功率以及所述第一信号的接收功率确定。
  36. 根据权利要求35所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述通信装置与所述第二终端设备之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
  37. 根据权利要求36任一项所述的通信装置，其中，所述第二信号的发射功率根据所述通信装置与所述第二终端设备之间的路径损耗估计值以及所述网络设备与所述第二终端设备之间的路径损耗估计值确定。
  38. 根据权利要求37任一项所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述通信装置与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
  39. 根据权利要求37任一项所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述通信装置与所述第二终端设备之间的路径损耗估计值，所述PLDL为所述网络设备与所述第二终端设备之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
  40. 一种通信装置，包括：
    用于接收来自第一终端设备的第一信号以及指示信息的装置；其中，所述指示信息用于指示或包括第一数值，所述第一数值为参考数值集合中的一个数值，所述参考数值集合中包括至少两个功率值，且所述第一数值不超过第一功率，所述第一功率根据所述第一信号的最大发射功率确定；
    用于根据所述指示信息以及所述第一信号的接收功率确定所述第一终端设备与用于之间的路径损耗估计值的装置。
  41. 根据权利要求40所述的通信装置，其中，所述第一数值不超过第二功率，所述第二功率根据网络设备与所述第一终端设备之间的路径损耗估计值确定。
  42. 根据权利要求40或41所述的通信装置，还包括：
    用于根据所述第一终端设备与通信装置之间的路径损耗估计值确定第二信号的发射功率的装置；
    用于以所述第二信号的发射功率向所述第一终端设备发送所述第二信号的装置。
  43. 根据权利要求42所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与通信装置之间的路径损耗估计值，所述PO_1为目标功率，所述α 1为路损补偿因子，所述f为调整参数。
  44. 根据权利要求42所述的通信装置，其中，还包括：
    用于根据所述第一终端设备与通信装置之间的路径损耗估计值以及所述网络设备与通信装置之间的路径损耗估计值确定所述第二信号的发射功率。
  45. 根据权利要求44所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与通信装置之间的路径损耗估计值，所述PLDL为所述网络设备与通信装置之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子。
  46. 根据权利要求44所述的通信装置，其中，所述第二信号的发射功率满足如下公式：
    P 2＝min{P CMAX_2,y(M)+P O_1+α 1·PL SL,y(M)+P O_2+α 2·PL DL+f}
    其中，所述PCMAX_2为所述第二信号的最大发射功率，所述y(M)为所述第二信号的带宽的函数，所述PLSL为所述第一终端设备与通信装置之间的路径损耗估计值，所述PLDL为所述网络设备与通信装置之间的路径损耗估计值，所述PO_1与所述PO_2为目标功率，所述α 1和所述α 2为路损补偿因子，所述f为调整参数。
  47. 根据权利要求40至46任一项所述的通信装置，其中，所述第一终端设备包括终端设备集合中与通信装置之间的路径损耗估计值最大的终端设备。
  48. 根据权利要求47所述的通信装置，其特征在于，所述终端设备集合为与通信装置已经建立连接的终端设备组成的集合；或者所述终端设备集合为与通信装置已经建立连接，且与通信装置距离在参考范围内的终端设备组成的集合。
  49. 一种通信设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，所述处理器执行所述程序时，实现如权利要求1至15中任一项所述的方法，或实现如权利要求16至24中任一项所述的方法。
  50. 一种装置，所述装置包括处理器，所述处理器用于与存储器耦合，并读取存储器中的指令并根据所述指令执行如权利要求1至14中任一项所述的方法。
  51. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1至15中任一项所述的方法，或使得计算机执行如权利要求16至24中任一项所述的方法。
  52. 一种计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行如权利要求1至15中任一项所述的方法，或使得计算机执行如权利要求16至24中任一项所述的方法。
  53. 一种芯片，其特征在于，与存储器相连或者包括存储器，用于读取并执行所述存储器中存储的软件程序，以实现如权利要求1至15中任一项所述的方法，或实现如权利要求16至24中任一项所述的方法。
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