WO2022064795A1 - 端末及び通信方法 - Google Patents

端末及び通信方法 Download PDF

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Publication number
WO2022064795A1
WO2022064795A1 PCT/JP2021/023674 JP2021023674W WO2022064795A1 WO 2022064795 A1 WO2022064795 A1 WO 2022064795A1 JP 2021023674 W JP2021023674 W JP 2021023674W WO 2022064795 A1 WO2022064795 A1 WO 2022064795A1
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WIPO (PCT)
Prior art keywords
terminal
link
transmission
base station
information
Prior art date
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Ceased
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PCT/JP2021/023674
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English (en)
French (fr)
Japanese (ja)
Inventor
敬 岩井
秀俊 鈴木
綾子 堀内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Corp of America
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Panasonic Intellectual Property Corp of America
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Priority to JP2022551147A priority Critical patent/JPWO2022064795A1/ja
Priority to US18/246,013 priority patent/US12557042B2/en
Publication of WO2022064795A1 publication Critical patent/WO2022064795A1/ja
Anticipated expiration legal-status Critical
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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]
    • H04W52/38—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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • 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
    • 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
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • This disclosure relates to terminals and communication methods.
  • a communication system called the 5th generation mobile communication system (5G) is being studied.
  • 5G 5th generation mobile communication system
  • 5G it is being considered to flexibly provide functions for each use case that requires an increase in communication traffic, an increase in the number of connected terminals, high reliability, and low latency.
  • 3GPP 3rd Generation Partnership Project
  • LTE LongTermEvolution
  • NR NewRadio
  • V2X vehicle to everything
  • 3GPP TR 38.885 V16.0.0 “Study on NR Vehicle-to-Everything (V2X) (Release 16),” 2019-03 3GPP TSG RAN Meeting # 88e, RP-201385, “WID revision: NR sidelink enhancement”, LG Electronics, June 2020 3GPP TS38.213 V16.2.0, “Physical layer procedures for control (Release 16)”, 2020-06
  • the non-limiting examples of the present disclosure contribute to the provision of terminals and communication methods capable of improving the efficiency of side-link transmission power control.
  • the terminal according to the embodiment of the present disclosure is based on a control circuit for controlling the transmission power of the side link based on information on a power control method according to the use of the communication link in the base station, and according to the control of the transmission power. It is provided with a transmission circuit for performing side link transmission.
  • the efficiency of side-link transmission power control can be improved.
  • the figure which shows the slot arrangement example of a side link The figure which shows an example of the parameter setting of the transmission power control for a side link.
  • the figure which shows an example of the parameter setting of the transmission power control for a side link The figure which shows an example of the parameter setting of the transmission power control for a side link.
  • the figure which shows an example of the parameter setting of the transmission power control for a side link The figure which shows an example of the parameter setting of the transmission power control for a side link.
  • FIG. 1 Figure showing an example of setting timing information of power control (PC) parameter
  • Block diagram showing a configuration example of a base station Block diagram showing a terminal configuration example Illustration of an exemplary architecture of a 3GPP NR system
  • Use scenarios for large-capacity high-speed communication eMBB: enhancedMobile BroadBand
  • mMTC massiveMachineTypeCommunications
  • URLLC UltraReliableandLowLatencyCommunications
  • V2X assumes communication between vehicle (V2V: Vehicle to Vehicle), road vehicle (V2I: Vehicle to Infrastructure), pedestrian vehicle (V2P: Vehicle to Pedestrian), and vehicle network (V2N: Vehicle to Network).
  • V2V, V2I, V2P use a link called Sidelink (SL: Sidelink) or PC5 to communicate directly between terminals (eg, at least one of transmission and reception) without going through a network with the base station. )It can be performed.
  • SL Sidelink
  • PC5 Sidelink
  • terminals eg, at least one of transmission and reception
  • UE User Equipment
  • the resources used for the side link are set by SL BWP (Band width part) and the resource pool.
  • SLBWP specifies a frequency band that can be used for the side link, and may be set separately from DLBWP or ULBWP set between the base station and the terminal (Uu). In addition, the frequency band of SLBWP may overlap with ULBWP.
  • the resource pool includes, for example, at least one resource in the frequency direction and the time direction specified in the resources in SLBWP.
  • a plurality of resource pools may be set in one terminal.
  • the side link transmission may be performed, for example, in units in which time resources are divided (for example, in slot units). Slots that can be used for sidelink transmission are, for example, X symbols or more (X represents a parameter) in the slot in the operation of the Uu link between the base station and the terminal are uplink symbols (called uplink symbols). It may be defined as a slot.
  • NR V2X is being considered to support unicast, groupcast, and broadcast in sidelink communication (for example, at least one of transmission and reception).
  • a transmitting terminal also referred to as a transmitter UE or TX UE
  • a receiving terminal for example, also referred to as a receiver UE or RX UE
  • transmission from a transmitting terminal to a plurality of receiving terminals included in a certain group is assumed.
  • Broadcast is assumed to be transmitted from a transmitting terminal without specifying a receiving terminal, for example.
  • SL channel Physical SL control channel
  • PSSCH physical SL shared channel
  • PSFCH physical SL feedback channel
  • PSBCH physical SL broadcast channel
  • PSCCH is an example of a control channel in SL
  • PSSCH is an example of a data channel in SL
  • PSFCH is an example of a channel used for transmission of a feedback signal in SL
  • PSBCH is an example of a broadcast (or broadcast) channel used for transmission without specifying a receiving terminal.
  • signal and “information” may be read as each other depending on the context.
  • a control signal (or control information) called sidelink control information (SCI) is arranged in the PSCCH.
  • SCI contains information (or parameters) about at least one of the transmission and reception (eg, decoding) of the PSSCH, eg, resource allocation information for a data signal (eg, PSSCH).
  • PSSCH for example, a data signal or a data signal and an SCI (for example, 2nd stage SCI) are arranged.
  • SCI for example, 2nd stage SCI
  • a feedback signal for example, hybrid automatic repeat request (HARQ) feedback
  • PSSCH for example, a data signal
  • the feedback signal may include, for example, a response signal indicating ACK or NACK (eg, ACK / NACK information, also referred to as HARQ-ACK).
  • HARQ-ACK hybrid automatic repeat request
  • PSBCH is, for example, transmitted together with sidelink Primary synchronization signal (S-PSS) and sidelink secondary synchronization signal (S-SSS), which is a signal for synchronization, and is also collectively referred to as S-SSB (sidelink synchronization signal block).
  • S-PSS sidelink Primary synchronization signal
  • S-SSS sidelink secondary synchronization signal
  • FIG. 1 is a diagram showing an arrangement example in a slot of PSCCH, PSSCH, and PSFCH.
  • PSFCH may not be placed depending on the settings.
  • the PSSCH may include, for example, a data demodulation reference signal (for example, DMRS: Demodulation Reference Signal) (not shown).
  • DMRS Demodulation Reference Signal
  • PSBCH may be transmitted together with, for example, a synchronization signal.
  • Mode 1 and Mode 2 are defined in the resource allocation method for SL communication.
  • the base station determines the resource used by the terminal in SL (for example, called SL resource) (in other words, the schedule).
  • the terminal autonomously selects (or determines) the resource to be used for SL from the resources in the preset resource pool. In other words, in Mode 2, the base station does not have to schedule SL resources.
  • Mode 1 is, for example, a state in which a base station and a terminal are connected, and is expected to be used in an environment where a terminal that performs side-link communication can receive instructions (or notifications) from the base station.
  • Mode 2 for example, the terminal can determine the resource to be used for SL even if there is no instruction from the base station. Therefore, for example, side-link communication is possible including terminals under the control of different operators or terminals outside the coverage.
  • Mode 2 may be applied to the terminal because the base station does not support the Mode 1 function.
  • Rel-16's NR V2X for example, either Mode 1 or Mode 2 is set for one terminal.
  • Rel-17's NR V2X for example, it is considered to support both Mode 1 and Mode 2 settings in addition to Mode 1 or Mode 2 settings for one terminal. ing. This enables more flexible allocation of resources for sidelink transmission.
  • the transmission power P PSSCH (i) [dBm] of PSSCH of NR V2X is calculated, for example, according to the equation (1) (see, for example, Non-Patent Document 3).
  • i indicates the slot number.
  • P CMAX indicates the maximum transmission power [dBm] of the terminal, and P CBR indicates the maximum transmission power [dBm] of the side link.
  • P PSSCH, D (i) is the transmission power based on the downlink (DL) path loss between the base station and the terminal, and is calculated according to the equation (2).
  • P PSSCH, SL (i) is the transmission power based on the path loss of the side link (for example, the link between V2X terminals), and is calculated according to the equation (3).
  • PO and D indicate the target received power [dBm] (parameter value) of the downlink between the base station and the terminal, and PO and SL are the side links.
  • the target received power [dBm] (parameter value) is shown.
  • ⁇ D indicates the path loss compensation rate (parameter value) of the downlink between the base station and the terminal
  • ⁇ SL indicates the path loss compensation rate (parameter value) of the side link.
  • 2 ⁇ ⁇ M RB PSSCH (i) is the transmission bandwidth of PSSCH normalized based on 15 kHz SCS, which is one of the subcarrier spacings (SCS) applied to PSSCH in slot number i [PRB].
  • SCS subcarrier spacings
  • PC Power Control
  • the interference power given to the base station (in other words, Uu link communication) by PSSCH (in other words, side link communication) can be controlled by P PSSCH, D (i) shown in equations (1) and (2).
  • the base station may control the PC parameters ( PO, D , ⁇ D ) related to the transmission power based on the downlink path loss shown in Eq. (2) so that the interference level due to PSSCH becomes equal to or less than the allowable value. ..
  • PC parameters such as ( PO, D , ⁇ D ) and ( PO, SL , ⁇ SL ) are base stations, for example, by higher layer signaling (eg, also referred to as Radio Resource Control (RRC) layer signaling or higher layer parameters). May be set (or notified, instructed) to the terminal.
  • RRC Radio Resource Control
  • the parameters related to the transmission power control of the side link are included in the parameter information indicating the resource pool setting of the side link (for example, "SL-ResourcePool").
  • Information eg, "SL-PowerControl”
  • the SL-PowerControl may include, for example, the above-mentioned two types of PC parameters ( PO, D , ⁇ D ) and ( PO, SL , ⁇ SL ).
  • SL-PowerControl may include, for example, the above-mentioned two types of PC parameters ( PO, D , ⁇ D ) and ( PO, SL , ⁇ SL ).
  • sl-Alpha-PSSCH-PSCCH corresponds to ⁇ SL
  • dl-Alpha-PSSCH-PSCCH corresponds to ⁇ D
  • sl-P0-PSSCH-PSCCH corresponds to PO, SL
  • dl-P0-PSSCH-PSCCH corresponds to P O and D.
  • the name of the parameter is not limited to the example shown in FIG. 2, and may be another name.
  • the same transmission power control as the PSSCH may be applied.
  • the transmit power may be calculated using PC parameters common to both PSSCH and PSCCH. It should be noted that the present invention is not limited to the case where the PC parameters common to both PSSCH and PSCCH are used, and individual (for example, different) PC parameters may be set for each of PSSCH and PSCCH.
  • the transmission power based on the downlink path loss (P PSSCH, D (i)) is the transmission power based on the side link path loss (P PSSCH, If it is smaller than SL (i)), the transmit power (P PSSCH, D (i)) based on the downlink path loss can be applied as shown in equation (4).
  • the path loss between the base station and the terminal eg, TX UE
  • PL SL in equation (3) eg, the path loss between the V2X terminal (eg, TX UE and RX UE)
  • the PL D ) of Eq. (2) becomes smaller, and the above-mentioned situation (for example, the situation where Eq. (4) is applied) is likely to occur.
  • the transmission power according to the equation (4) is applied based on the PC parameter set for reducing the interference to the base station.
  • Sidelink transmission power is easily limited.
  • the V2X terminal (for example, the TX UE shown in FIG. 3) has a PSSCH in order to maintain the reliability of the data reception performance with a lower transmission power as compared with the transmission power P PSSCH, SL (i), for example.
  • the amount of data to be transmitted can be reduced, and PSSCH can be transmitted by setting a modulation method and coding rate (MCS: Modulation and Codding Scheme) with higher robustness. Therefore, the throughput of data transmission by the side link can be reduced (or limited).
  • MCS Modulation and Codding Scheme
  • a terminal for example, V2X
  • V2X that performs sidelink communication depending on the use of the Uu link (or the operation of the Uu link, for example, the setting or switching of the uplink (UL) or the downlink (DL)).
  • Appropriate transmit power to the terminal can vary.
  • FIG. 4 shows an example in which the Uu link is used for DL communication
  • FIG. 5 shows an example in which the Uu link is used for UL.
  • the base station for example, gNB
  • the V2X terminal for example, TXUE
  • the base station that transmits the downlink signal of the Uu link is less susceptible to interference from the V2X terminal, so the PSSCH transmitted from the V2X terminal is transmitted. It is possible to set the power higher (eg, based on the path loss of the side link).
  • PSSCH transmitted from the V2X terminal may interfere with the terminal that receives the downlink signal of the Uu link.
  • the base station can schedule downlink transmission so as to reduce the influence of interference by, for example, grasping the position information of the terminal in advance.
  • the base station can schedule downlink transmission so as to reduce the influence of interference by, for example, grasping the position information of the terminal in advance.
  • by scheduling downlink transmission to a terminal that is farther from the V2X terminal it is possible to reduce PSSCH interference with the terminal that receives the downlink signal.
  • the base station for example, gNB
  • the V2X terminal for example, TX UE
  • the transmit power of PSSCH can be set based on the path loss of the side link.
  • the base station for example, gNB
  • the V2X terminal for example, TX UE
  • the path loss between the base station and the V2X terminal becomes larger, and in equation (1), P PSSCH, SL (i) is P. Since it tends to be smaller than PSSCH, D (i)), it is possible to set the transmission power of PSSCH to be larger (for example, set based on the path loss of the side link).
  • the V2X terminal for example, TX UE
  • the V2X terminal that transmits PSSCH exists in the vicinity of the base station (exists within a predetermined distance). (Case) (not shown), because the path loss between the base station and the V2X terminal is smaller, and in equation (1), P PSSCH, D (i) tends to be smaller than P PSSCH, SL (i)).
  • PSSCH transmit power can be set (in other words, limited) based on downlink path loss.
  • the appropriate setting value of the transmission power of PSSCH transmitted from the terminal performing side link communication may differ depending on the use of the Uu link (in other words, the operation of the communication link of the base station).
  • the transmission power of PSSCH can be set according to the distance between the terminal performing the side link communication and the base station.
  • the transmission power of PSSCH is the transmission power based on the path loss of the side link (regardless of the distance between the terminal performing the side link communication and the base station). In other words, it can be set to higher transmission power).
  • the base station sets a plurality of PC parameters for one terminal (for example, V2X terminal) individually for each resource pool according to the purpose of the Uu link by the base station (for example, either DL or UL). You can do it.
  • the terminal may perform transmission power control for the side link based on, for example, any one of a plurality of set PC parameters.
  • the efficiency of the transmission power control of the side link can be improved, and the throughput of data transmission in the side link can be improved.
  • the system performance is achieved by dynamically changing the ratio between DL and UL of the Uu link according to the traffic status of the terminals in the small cell. Can be improved. For example, by switching the transmission power control of the side link according to the use of the Uu link described above, the small cell can be expected to improve the throughput of the data transmitted in the side link.
  • the communication system may include, for example, a base station 100 (for example, gNB or eNB) and a terminal 200 (for example, a terminal that performs side-link communication such as V2X communication).
  • the number of terminals 200 may be 1 or more, but when focusing on side link communication, it is 2 or more.
  • FIG. 6 is a block diagram showing a configuration example of a part of the terminal 200 according to one aspect of the present disclosure.
  • the control unit (for example, corresponding to a control circuit) transmits a side link based on information (for example, a PC parameter) regarding a power control method according to the use of the communication link in the base station. Control power.
  • the transmission unit (for example, corresponding to a transmission circuit) performs side-link transmission according to the control of transmission power.
  • FIG. 7 is a block diagram showing a configuration example of the base station 100 according to one aspect of the present disclosure.
  • the base station 100 is, for example, a PC parameter setting unit 101, an error correction coding unit 102, a modulation unit 103, a transmission unit 104, a reception unit 105, a demodulation unit 106, and an error correction / decoding unit. 107 and may have.
  • the PC parameter setting unit 101 sets, for example, the PC parameters for the terminal 200.
  • the PC parameter setting unit 101 may set the parameters to be set in the terminal 200 based on the information about the terminal 200 such as the position information of the terminal 200 or the reception quality previously fed back from the terminal 200.
  • the PC parameter setting unit 101 may output, for example, the setting information of the RRC layer including the control information indicating the set PC parameter (for example, the transmission power control information for SL) to the error correction coding unit 102.
  • the base station 100 generates the information to be transmitted in the upper layer (for example, the RRC layer) in the PC parameter setting unit 101, and transmits the information related to the PC parameter setting to the terminal 200.
  • the case of setting is described.
  • the setting of the PC parameter is not limited to this, and may be, for example, a setting in the application layer called Pre-configured, or may be set in advance in the Subscriber Identity Module (SIM), and the terminal 200 may be set. , It is possible to operate without the setting from the base station 100.
  • the error correction coding unit 102 receives, for example, the transmission data signal (DL data) and the signaling of the upper layer input from the PC parameter setting unit 101 as inputs, and error-corrects encodes and encodes the input signals.
  • the signal is output to the modulation unit 103.
  • the modulation unit 103 performs modulation processing on the signal input from the error correction coding unit 102, and outputs the modulated data signal to the transmission unit 104.
  • the base station 100 maps the modulated signal to a frequency resource and performs an inverse fast Fourier transform.
  • An OFDM signal may be formed by performing (IFFT: Inverse Fast Fourier Transform) processing, converting it into a time waveform, and adding a cyclic prefix (CP).
  • IFFT Inverse Fast Fourier Transform
  • the transmission unit 104 performs wireless transmission processing such as up-conversion, digital-to-analog (D / A) conversion, and amplification with respect to the transmission signal input from the modulation unit 103, and transmits the wireless signal from the antenna to the terminal 200. ..
  • the receiving unit 105 receives the signal transmitted from the terminal 200 at the antenna, performs wireless reception processing such as down-conversion and analog-to-digital (A / D) conversion, and outputs the obtained received signal to the demodulation unit 106. ..
  • the demodulation unit 106 performs demodulation processing on the input signal, for example, and outputs the obtained signal to the error correction decoding unit 107.
  • the base station 100 for example, the demodulation unit 106 may perform CP removal processing and fast Fourier transform (FFT) processing.
  • FFT fast Fourier transform
  • the error correction decoding unit 107 decodes the signal input from the demodulation unit 106, for example, to obtain the received data signal (UL data) from the terminal 200.
  • the SCI information transmitted by the terminal 200 via the side link is generated in the base station 100 (for example, the PC parameter setting unit 101 or another block (not shown)). You may.
  • the SCI information generated by the base station 100 may be transmitted to the terminal 200, for example, as a signal of an upper layer or as a signal of a physical layer (for example, PDCCH; Physical Downlink Control Channel).
  • FIG. 8 is a block diagram showing a configuration example of the terminal 200 according to the present embodiment.
  • the terminal 200 can be either a transmitting terminal or a receiving terminal.
  • the terminal 200 includes a reception unit 201, a signal separation unit 202, a demodulation unit 203, an error correction decoding unit 204, a path loss measurement unit 205, a transmission power calculation unit 206, and error correction coding.
  • a unit 207, a modulation unit 208, and a transmission unit 209 may be provided.
  • control unit shown in FIG. 6 includes a signal separation unit 202, a demodulation unit 203, an error correction decoding unit 204, a path loss measurement unit 205, a transmission power calculation unit 206, an error correction coding unit 207, and a modulation unit 208. May include. Further, for example, the transmission unit shown in FIG. 6 may include a transmission unit 209.
  • the receiving unit 201 receives, for example, a received signal by an antenna, performs wireless reception processing such as down-conversion and A / D conversion on the received signal, and outputs the obtained received signal to the signal separation unit 202.
  • the signal separation unit 202 may, for example, receive a data signal from the base station 100 or another terminal 200 (for example, a V2X terminal) from a reception signal input from the reception unit 201, and a reception data signal from the base station 100 or another terminal 200. Separate from the reference signal.
  • the signal separation unit 202 outputs, for example, the received data signal to the demodulation unit 203 and outputs the reference signal to the path loss measurement unit 205.
  • the reference signal may be, for example, DMRS, Channel State Information (CSI) -RS, or a synchronization signal.
  • the demodulation unit 203 performs demodulation processing on the received data signal input from the signal separation unit 202, and outputs the demodulated signal to the error correction decoding unit 204.
  • the terminal 200 for example, the demodulation unit 203 may perform CP removal processing and FFT processing, for example.
  • the error correction decoding unit 204 may decode the demodulated signal input from the demodulation unit 203, and output the decoded signal as a received data signal, for example. Further, the error correction decoding unit 204 outputs, for example, the SL transmission power control information (for example, including the setting information of the PC parameter) received in the upper layer among the received data signals to the transmission power calculation unit 206.
  • the SL transmission power control information for example, including the setting information of the PC parameter
  • the path loss measuring unit 205 measures, for example, the path loss (for example, PLD ) of the downlink between the base station 100 and the terminal 200 based on the reference signal from the base station 100 input from the signal separation unit 202. It's okay. Further, the path loss measuring unit 205 has a side link path loss (for example, PL SL ) between the terminals 200 (for example, between V2X terminals) based on a reference signal from another terminal 200 input from the signal separating unit 202, for example. ) May be measured. The path loss measuring unit 205 outputs the measured path loss value to the transmission power calculation unit 206.
  • the path loss for example, PLD
  • the path loss measuring unit 205 has a side link path loss (for example, PL SL ) between the terminals 200 (for example, between V2X terminals) based on a reference signal from another terminal 200 input from the signal separating unit 202, for example. ) May be measured.
  • the path loss measuring unit 205 outputs the measured path loss value
  • the transmission power calculation unit 206 calculates the transmission power of the PSSCH based on, for example, the side link transmission power control information input from the error correction decoding unit 204 and the path loss value input from the path loss measurement unit 205.
  • the calculated PSSCH transmission power information is output to the transmission unit 209.
  • the error correction coding unit 207 takes, for example, a data signal (for example, sidelink transmission data) as an input, performs error correction coding of the transmission data, and outputs the encoded signal to the modulation unit 208.
  • a data signal for example, sidelink transmission data
  • the modulation unit 208 modulates the signal input from the error correction coding unit 207, for example, and outputs the modulated signal to the transmission unit 209.
  • the terminal 200 for example, the modulation unit 208 may form the OFDM signal by performing IFFT processing after mapping the modulation signal to the frequency resource and adding CP. ..
  • the transmission unit 209 performs wireless transmission processing such as up-conversion and D / A conversion on the input signal from the modulation unit 208. Further, the transmission unit 209 transmits the signal after the wireless transmission process from the antenna based on the transmission power instructed by the transmission power calculation unit 206.
  • the resource allocation method for side-link communication can be applied to both Mode 1 and Mode 2.
  • FIG. 9 is a sequence diagram showing an operation example of the base station 100 and the terminal 200.
  • the base station 100 sets, for example, a PC parameter for the terminal 200 (S101).
  • the base station 100 may set PC parameters corresponding to each of the DL and UL of the Uu link.
  • the base station 100 sets (or transmits or notifies) the transmission power control information for SL including the setting information of the PC parameter to the terminal 200 by higher layer signaling (for example, RRC layer signal) (S102).
  • higher layer signaling for example, RRC layer signal
  • the terminal 200 controls the transmission power of the side link, for example (S103).
  • the terminal 200 may calculate the transmission power in the side link communication (for example, the transmission power of PSSCH) based on the measured path loss and the transmission power control information for SL transmitted from the base station 100.
  • the terminal 200 performs side link communication (for example, PSSCH transmission) according to the control of the side link transmission power (S104).
  • side link communication for example, PSSCH transmission
  • S104 side link transmission power
  • the base station 100 may set a plurality of PC parameters (for example, target received power and path loss compensation rate) for PSSCH transmission individually in the resource pool for the terminal 200.
  • the base station 100 and the terminal 200 may use a plurality of PC parameters, for example, depending on the use (for example, DL or UL) of the Uu link which is the communication link of the base station 100.
  • the plurality of PC parameters may include individual parameters for DL and UL (or DL, UL or Flexible Link (FL)).
  • the PC parameters for which a plurality (for example, a plurality of candidates) are set are, for example, PC parameters related to the transmission power based on the path loss in the Uu link (for example, DL) (for example, PO, D and ⁇ D of the equation (2)). ) Is fine.
  • base station 100 has PC parameters (eg, PO, D, DL and ⁇ D, DL) when the Uu link is used for DL, and PC parameters when the Uu link is used for UL (eg, P O, D, DL and ⁇ D, DL ).
  • PC parameters eg, PO, D, DL and ⁇ D, DL
  • PC parameters when the Uu link is used for UL eg, P O, D, DL and ⁇ D, DL
  • P O, D, UL and ⁇ D, UL may be set.
  • the base station 100 and the terminal 200 can transmit power based on the path loss of the downlink between the base station 100 and the terminal 200 (for example, P PSSCH, D (i)) depending on the use of the Uu link. ) Can be controlled, so that the transmission power of the PSSCH can be appropriately controlled in consideration of the interference caused by the side link communication (for example, the transmission of the PSSCH) to the Uu link.
  • the PC parameters (eg PO, D, DL and ⁇ D, DL ) when the Uu link is used for DL are based on path loss in DL compared to when the Uu link is used for UL.
  • the transmit power (P PSSCH, D (i)) may be set to be calculated lower.
  • the transmission power based on the side link path loss (P PSSCH, SL (i)) is higher than the transmission power based on the DL path loss (P PSSCH, D (i)). It tends to be small, and the transmission power based on the path loss of the side link (P PSSCH, SL (i)) is easily applied to the transmission power P PSSCH (i) of PSSCH. Therefore, for example, when the Uu link is used for DL, the terminal 200 can transmit and receive data with a desired throughput using the side link.
  • ⁇ Setting example 1> In setting example 1, a set of a plurality of PC parameters may be set in the transmission power control information for SL.
  • FIG. 10 is a diagram showing an example of parameter information (for example, SL-ResourcePool) indicating the resource pool setting of the side link in the setting example 1.
  • parameter information for example, SL-ResourcePool
  • the transmission power control information for SL (for example, SL-PowerControl) in the SL-ResourcePool includes setting information (for example, dL-P0-PSSCH-PSCCH-AlphaSets) including a set of a plurality of PC parameters. ) May be set.
  • the setting information (DL-P0-PSSCH-PSCCH-AlphaSet) including a set of a plurality of PC parameters includes, for example, the PC parameters (for example, the target received power (p0) and the path loss compensation rate (alpha)). ), And the information that identifies the set (eg, the set ID (SetId)).
  • PC parameters ( PO, D and ⁇ D ) for calculating transmission power based on DL path loss may be set individually for each Uu link application.
  • the setting information (DL-) corresponding to the Uu link used for a flexible link FL: Flexible link) that is neither UL nor DL (in other words, can be used for either UL or DL).
  • the terminal 200 selects one PC parameter from the PC parameters set in the terminal 200 based on, for example, the use of the Uu link (for example, DL, UL, or FL), and sets the selected PC parameter as the selected PC parameter.
  • the transmission power of PSSCH may be calculated based on this. By this transmission power control, the terminal 200 can reduce the interference given to the Uu link and appropriately control the transmission power of PSSCH.
  • the PC parameter for DL of the Uu link and the PC parameter for UL may be set in the transmission power control information for SL.
  • FIG. 11 is a diagram showing an example of parameter information (for example, SL-ResourcePool) indicating the resource pool setting of the side link in the setting example 2.
  • parameter information for example, SL-ResourcePool
  • the transmission power control information for SL (for example, SL-PowerControl) in the SL-ResourcePool includes setting information (for example, dL-P0) containing a plurality of PC parameters for each Uu link application.
  • setting information for example, dL-P0
  • -PSSCH-PSCCH-AlphaSets may be set.
  • the PC parameter for UL of Un link (dl-Alpha-PSSCH-PSCCH-UL and dl-P0-PSSCH-PSCCH-UL) and the PC parameter for DL of Uu link (dl- Alpha-PSSCH-PSCCH-DL and dl-P0-PSSCH-PSCCH-DL) are set.
  • PC parameters (dl-Alpha-PSSCH-PSCCH-FL and dl-P0-PSSCH-PSCCH-FL) for a flexible link (FL) that is neither UL nor DL may be set.
  • the terminal 200 selects one PC parameter from the PC parameters set in the terminal 200 based on, for example, the use of the Uu link (for example, DL, UL, or FL), and sets the selected PC parameter as the selected PC parameter.
  • the transmission power of PSSCH may be calculated based on this. By this transmission power control, the terminal 200 can reduce the interference given to the Uu link and appropriately control the transmission power of PSSCH.
  • the example of setting PC parameters has been explained above.
  • the method of setting the PC parameters in the setting example 1 and the setting example 2 is an example, and the PC parameters individual to the Uu link application may be set by another method.
  • the terminal 200 selects, for example, from a plurality of PC parameters included in the transmission power control information for SL, the PC parameters applied to the time resource of the side link transmission (for example, the transmission slot timing of PSSCH).
  • the terminal 200 calculates the transmission power of PSSCH based on, for example, the selected PC parameter and the measured value of the path loss (for example, PL D and PL SL ).
  • the following describes an example of selecting PC parameters applied to the transmission timing (transmission slot) of PSSCH.
  • selection example 1 the information for setting (or instructing) the PC parameter applied in each slot is included in the transmission power control information for SL.
  • FIG. 12 is a diagram showing an example of parameter information (for example, SL-ResourcePool) indicating the resource pool setting of the side link in the selection example 1.
  • parameter information for example, SL-ResourcePool
  • SL-PowerControl for example, upper layer parameters: dl-P0-Alpha-timeResource
  • the radio frame section may be, for example, a section corresponding to 1 SFN (System frame number) or 1 DFN (Direct frame number).
  • the slot length for setting the PC parameter for each slot is the same as the slot length of the information (for example, sl-TimeResource shown in FIG. 12) that periodically indicates the time resource of the resource pool. It's fine.
  • the information for setting the PC parameter for each slot is associated (or combined) with the slot number and the set ID as shown in FIG. ) May be shown.
  • the information for setting the PC parameter for each slot includes the slot number and the uplink (UL) or downlink (UL) or downlink (UL) as shown in FIG.
  • the correspondence (or combination) with the link (DL) may be shown.
  • the terminal 200 applies the PC parameters for DL in the slots 0 to 4 and the PC parameters in the slots 5 to 9 based on the information for setting the PC parameters for each slot shown in FIG. PC parameters for UL may be applied.
  • the information for setting the PC parameter for each slot may include the setting related to the flexible link.
  • the terminal 200 receives, for example, the SL transmission power control information (for example, the upper layer signal) that sets the PC parameter applied to the side link transmission slot, and uses the received SL transmission power control information as the received SL transmission power control information. Based on, select one of the multiple PC parameters.
  • the SL transmission power control information for example, the upper layer signal
  • the PC parameters applied in the terminal 200 are set quasi-statically according to the use of the Uu link by the base station 100, so that the terminal 200 is a PC applied in the slot for performing PSSCH transmission. Parameters can be easily selected.
  • the terminal 200 sets the PC parameters applied in each slot to the symbol-based uplink and downlink application patterns (eg, DL-UL pattern or time resource allocation pattern) applied in the Uu link. Select based on (call). For example, the terminal 200 may select a PC parameter to be applied in each slot from a plurality of PC parameters included in the transmission power control information for SL according to a predetermined rule based on the DL-UL pattern.
  • the symbol-based uplink and downlink application patterns eg, DL-UL pattern or time resource allocation pattern
  • the terminal 200 can specify, for example, the DL-UL pattern applied by the base station 100 in the Uu link.
  • the DL-UL pattern applied by the base station 100 in the Uu link may be set by the RRC layer for the terminal 200.
  • it may be set by the DL-UL pattern (also called sl-TDD-Configuration) included in the RRC information of the resource pool.
  • the terminal 200 sets the PC parameter corresponding to more symbols among the symbols corresponding to DL, UL and FL (for example, also referred to as DL symbol, UL symbol and FL symbol). You may choose.
  • the terminal 200 when the number of DL symbols is larger than the number of UL symbols in a certain slot, the terminal 200 has a PC parameter corresponding to DL among a plurality of PC parameters (for example, also referred to as DL parameter). ) May be applied to the slot.
  • DL parameter a PC parameter corresponding to DL among a plurality of PC parameters
  • the terminal 200 when the number of UL symbols is larger than the number of DL symbols in a certain slot, the terminal 200 has a PC parameter corresponding to UL among a plurality of PC parameters (for example, UL). (Also called parameter) may be applied to the slot.
  • FIG. 15 shows an example in which the selection of the PC parameter is not based on the FL symbol
  • the PC parameter may be selected based on the FL symbol.
  • the terminal 200 has a PC parameter corresponding to FL among a plurality of PC parameters (for example, also referred to as FL parameter). May be applied to the slot.
  • the terminal 200 may select a PC parameter corresponding to any one of the plurality of link types.
  • the FL symbol can be dynamically used (or changed) by the base station 100 as a UL symbol or a DL symbol by PDCCH (for example, SFI: Slot-Format-Indicator) according to the traffic situation of the accommodating terminal, for example. ) Is a symbol.
  • the terminal 200 can identify a dynamic change of the FL symbol (eg, either a DL symbol or a UL symbol), for example by receiving a PDCCH (eg, SFI).
  • the terminal 200 selects the PC parameter to the DL-UL pattern after updating the FL symbol (in other words, after changing the FL symbol to either DL or UL). It may be done based on. For example, the terminal 200 may select a PC parameter corresponding to a larger number of DL symbols and UL symbols in the changed DL-UL pattern.
  • the terminal 200 selects any one of the plurality of PC parameters based on the information regarding the DL-UL pattern in the slot in the Uu link, for example.
  • the terminal 200 can dynamically (or autonomously) select the PC parameter to be applied in the PSSCH transmission slot based on the use of the Uu link in the base station 100.
  • the terminal 200 When the terminal 200 cannot specify the DL-UL pattern applied by the base station 100 in the Uu link, such as when the terminal 200 is out of the coverage of the base station 100, for example, as in the selection example 1, the terminal 200 is SL.
  • the PC parameter may be selected based on the information including the transmission power control information indicating the PC parameter applied to each slot.
  • the base station 100 provides the terminal 200 with information regarding the power control method according to the usage of the Uu link (in the present embodiment, a plurality of PC parameters individually for the usage of the Uu link). Set. Further, the terminal 200 controls the transmission power of the side link based on the information (PC parameter in the present embodiment) regarding the power control method according to the use of the Uu link, and the side link transmission is performed according to the control of the transmission power. I do.
  • the terminal 200 can appropriately set the transmission power of the PSSCH according to the link type of the Uu link. Interference with the base station 100 can be reduced, and the throughput at the side link can be improved.
  • the terminal 200 can perform side link transmission when the UL symbol in the slot in which PSSCH is transmitted is equal to or higher than the threshold value X.
  • the regulation of the number of UL symbols in the slot may be changed.
  • side-link transmission may be permitted regardless of the number of UL symbols in the slot in which PSSCH is transmitted.
  • side link transmission may be permitted when the sum of the UL symbol and the FL symbol in the slot to which PSSCH is transmitted is equal to or greater than the threshold value X.
  • the communication system may include, for example, a base station 300 (eg, gNB or eNB) and a terminal 400 (eg, a V2X terminal).
  • the number of terminals 400 may be 1 or more, but when focusing on side link communication, it is 2 or more.
  • Mode 1 for example, a mode in which the base station 300 determines the resource used by the terminal 200 in the side link
  • the base station 300 transmits control information (for example, PDCCH or DCI) including a side link transmission resource to the terminal 400 (for example, a V2X terminal), and the terminal 400 receives the control information. do.
  • control information transmitted from the base station 300 to the terminal 400 may include information indicating PC parameters applied to the time resource (for example, slot) of the side link transmission.
  • FIG. 17 is a block diagram showing a configuration example of the base station 300 according to the present embodiment.
  • the same reference numerals are given to the same configurations as those in the first embodiment (FIG. 7).
  • the base station 300 shown in FIG. 17 is different from the base station 100 shown in FIG. 7 in that a control signal generation unit 301 is added.
  • the control signal generation unit 301 generates, for example, control information to be transmitted from the base station 300 to the terminal 400 (for example, control information included in the PDCCH).
  • the control information may include, for example, SCI (Sidelink control information), which is control information for sidelink transmission.
  • the control information may include information indicating PC parameters for PSSCH in addition to SCI.
  • the information indicating the PC parameters for PSSCH may be, for example, information indicating the PC parameters applied in the terminal 400 among a plurality of PC parameters set in the terminal 400 by the RRC layer.
  • the transmission timing (for example, transmission slot timing) of the output signal from the error correction coding unit 102 (for example, including the setting information of the RRC layer) and the output signal from the control signal generation unit 301 may be the same but different. You may.
  • FIG. 18 is a block diagram showing a configuration example of the terminal 400 according to the present embodiment.
  • the same reference numerals are given to the same configurations as those in the first embodiment (FIG. 8).
  • the terminal 400 shown in FIG. 18 is different from the terminal 200 shown in FIG. 8 in that the control signal demodulation unit 401 is added and the operation of the transmission power calculation unit 402 is different.
  • the control signal demodulation unit 401 demodulates the PDCCH from the base station 300 and receives the control signal.
  • the control signal demodulation unit 401 selects, for example, a PC parameter to be applied in the side link transmission based on the control signal, and outputs information about the selected PC parameter to the transmission power calculation unit 402.
  • the transmission power calculation unit 402 calculates the transmission power for side-link transmission based on the information regarding the PC parameters input from the control signal demodulation unit 401.
  • the base station 300 associates the PC parameter with the instruction information of the PC parameter notified by the control signal (for example, PDCCH or DCI) with the transmission power control information for SL set in the terminal 200 by the upper layer.
  • the instruction information of the PC parameter is 1 bit (when the value is 0 or 1)
  • the value 0 of the instruction information is associated with the PC parameter when the Uu link is UL
  • the value 1 of the instruction information is associated with it.
  • the number of bits of the instruction information and the association with the PC parameter are not limited to the above-mentioned example.
  • the terminal 400 may select a PC parameter instructed by the instruction information of the PC parameter included in the control signal (for example, PDCCH) notified from the base station 300 from a plurality of set PC parameters. .. Then, the terminal 400 may calculate the transmission power of the side link based on, for example, the selected PC parameter and the measured path loss (for example, PL D and PL SL ).
  • a PC parameter instructed by the instruction information of the PC parameter included in the control signal for example, PDCCH
  • the terminal 400 may calculate the transmission power of the side link based on, for example, the selected PC parameter and the measured path loss (for example, PL D and PL SL ).
  • the base station 300 transmits downlink control information (for example, PDCCH or DCI) indicating the PC parameters applied to the side link transmission slots among the plurality of PC parameters set in the terminal 400. Further, the terminal 400 receives downlink control information (for example, PDCCH or DCI) indicating the PC parameter applied to the side link transmission slot among the plurality of PC parameters set in the terminal 400, and receives the downlink. Select one of the multiple PC parameters based on the control information.
  • downlink control information for example, PDCCH or DCI
  • the base station 300 can dynamically instruct the PC parameters applied to PSSCH by the control signal (PDCCH or dynamic signaling) according to the use of the Uu link.
  • the terminal 400 can dynamically determine the transmission power of the side link according to the use of the Uu link by receiving, for example, an instruction regarding the PC parameter applied to PSSCH by PDCCH.
  • the efficiency of the transmission power control of the side link can be improved. For example, by improving the transmission power control of the side link communication based on the use of the Uu link, the efficiency of the transmission power control of the side link can be improved, so that the throughput of data transmission by the side link can be improved.
  • the terminal eg, terminal 200 or terminal 400; the same applies hereinafter
  • the terminal is a PC based on the use of the Uu link of the base station (eg, base station 100 or base station 300; the same applies hereinafter).
  • the selection criteria of PC parameters are not limited to the use of Uu link.
  • a plurality of PC parameters for sidelink transmission may be set, for example, as shown in the example below.
  • Example 1 For example, when both Mode 1 and Mode 2 settings for one terminal are supported as the resource allocation method for side-link communication, the terminal uses the resource allocation method applied when performing PSSCH transmission (for example, Mode 1 and Mode 2).
  • PC parameters to be applied to sidelink transmission may be selected (or switched) based on (any of Mode 2).
  • the PC parameters may be set individually for the resource allocation method (eg Mode 1 and Mode 2) applied to the PSSCH transmission.
  • the transmission power control information for SL set from the base station to the terminal by the RRC layer includes PC parameters for Mode 1 (for example, PO, D, Mode 1 and ⁇ D, Mode 1 ), and Mode 2 for Mode 2.
  • PC parameters eg, PO, D, Mode 2 and ⁇ D, Mode 2
  • the transmission power P PSSCH, D (i) may be calculated based on the equation (5).
  • the terminal may calculate the transmission power P PSSCH, D (i) based on the equation (6).
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission according to the resource allocation mode of the side link transmission.
  • Aperiodic transmission tends to transmit information that requires low delay or high reliability as compared with Periodic transmission.
  • different PC parameters may be set for Periodic transmission and Aperiodic transmission.
  • the terminal may select (or switch) the PC parameters applied to the sidelink transmission, for example, based on either Periodic or Aperiodic transmission.
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission according to the transmission cycle of the side link transmission.
  • Example 3 For example, when the resource allocation mode is Mode 1, the base station schedules periodic radio resources quasi-statically by notifying the terminal of the RRC layer (also called configured grant scheduling), and the base station A method (also called Dynamic grant scheduling) of dynamically scheduling one side link transmission by using a control signal (PDCCH) for a terminal is examined.
  • the RRC layer also called configured grant scheduling
  • the base station A method also called Dynamic grant scheduling
  • Dynamic grant scheduling tends to transmit information that requires low delay or high reliability as compared with transmission by Configure grant scheduling (Configured grant transmission).
  • different PC parameters may be set for the Configured grant transmission and the Dynamic grant transmission.
  • the terminal may select (or switch) the PC parameters to be applied to the side link transmission, for example, based on either the Configured grant transmission or the Dynamic grant transmission.
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission according to the scheduling method of the side link transmission by the base station.
  • the requirements for low delay or high reliability of transmitted data may differ depending on the cast type such as unicast, group cast, or broadcast.
  • individual PC parameters may be set for the cast type such as unicast, group cast, or broadcast.
  • the terminal may select (or switch) the PC parameter to be applied to the side link transmission, for example, based on the cast type.
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission according to the cast type of the side link transmission.
  • the 1st-stage SCI transmitted by the terminal by PSSCH contains information (Priority field) regarding the priority of the accompanying data.
  • the base station may set different PC parameters based on the priority information.
  • the terminal may select (or switch) the PC parameter to be applied to PSSCH, for example, based on the priority information set in the 1st-stage SCI.
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission according to the priority of the data to be transmitted by the side link.
  • Example 6 For example, as shown in FIG. 1, for side link transmission, a slot having a PSFCH which is feedback request information from a receiving terminal (for example, FIG. 1B) and a slot without a PSFCH (for example, FIG. 1). (A) exists.
  • HARQ is not applied to slots without PSFCH, so there is a possibility that higher reliability will be required for slots without PSFCH compared to slots with PSFCH.
  • different PC parameters may be set based on the presence or absence of PSFCH.
  • the terminal may select (or switch) the PC parameters applied to the sidelink transmission, for example, based on whether the PSFCH is placed in the slot.
  • the base station and the terminal can control the interference level that the base station can tolerate and the transmission power of the side link transmission depending on the presence or absence of the feedback request information of the side link transmission.
  • the PC parameters may be set according to at least two examples of Examples 1 to 6 described above.
  • a plurality of sets of PC parameters are PC parameters applied to transmission power control based on DL path loss (for example, P 0, D and ⁇ D in Eq. (2)).
  • the PC parameter in which a plurality of sets are set may be a PC parameter (for example, P 0, SL and ⁇ SL in Eq. (3)) applied to the transmission power control based on the path loss of the side link.
  • the terminal can control the transmission power (for example, P PSSCH, SL (i)) based on the path loss of the side link according to the use of the Uu link by the base station. It is possible to properly control the transmission power of PSSCH based on it.
  • the terminal transmits the side link according to the usage of the Uu link.
  • the transmission power control formula used for power control may be changed.
  • a transmission power control formula according to the use (or operation, type) of the Uu link may be applied.
  • individual transmit power control equations may be applied to different uses of the Uu link.
  • the terminal calculates the transmit power according to the PSSCH transmit power control equation shown in equation (7) when the Uu link is used for DL, and when the Uu link is used for UL, the equation ( The transmission power may be calculated according to the transmission power control formula of PSSCH shown in 8).
  • the transmission power equation shown in the equation (7) is based on the downlink path loss by enabling the transmission power based on the side link path loss (for example, P PSSCH, SL (i)) in the equation (1). It may be understood that it is equivalent to the case where the transmission power (for example, P PSSCH, D (i)) is set to invalid.
  • the transmission power based on the path loss of the side link for example, P PSSCH, SL (i)
  • the transmission power based on the path loss of the side link for example, P PSSCH, SL (i)
  • the downlink is set. It may be understood that it is equivalent to the case where the transmission power based on the path loss of (for example, P PSSCH, D (i)) is enabled.
  • Information regarding the transmission power control formula may be explicitly or implicitly notified (or set) from the base station to the terminal by, for example, higher layer signaling or PDCCH (or DCI), and is pre-configured to the terminal. You may.
  • the transmission power control of the PSSCH has been described, but the target of the transmission power control in the side link is not limited to the PSSCH, and other channels or signals may be used.
  • the downlink control signal may be, for example, a signal (or information) transmitted on the Physical Downlink Control Channel (PDCCH) of the physical layer, and may be a signal (or information) transmitted in the upper layer Medium Access. It may be a signal (or information) transmitted in Control (MAC) or Radio Resource Control (RRC). Further, the signal (or information) is not limited to the case of being notified by the downlink control signal, and may be predetermined in the specifications (or standards) or may be preset in the base station and the terminal.
  • PDCCH Physical Downlink Control Channel
  • RRC Radio Resource Control
  • the uplink control signal may be, for example, a signal (or information) transmitted in the PDCCH of the physical layer, or a signal transmitted in the MAC or RRC of the upper layer. (Or information) may be used. Further, the signal (or information) is not limited to the case of being notified by the uplink control signal, and may be predetermined in the specifications (or standards) or may be preset in the base station and the terminal. Further, the uplink control signal may be replaced with, for example, uplink control information (UCI), 1st stage sidelink control information (SCI), or 2nd stage SCI.
  • UCI uplink control information
  • SCI 1st stage sidelink control information
  • 2nd stage SCI 2nd stage SCI.
  • the base station is a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver. It may be a Station (BTS), a master unit, a gateway, etc. Further, in side link communication, a terminal may be used instead of the base station. Further, instead of the base station, it may be a relay device that relays the communication between the upper node and the terminal.
  • TRP Transmission Reception Point
  • RRH Remote Radio Head
  • eNB eNodeB
  • gNB gNodeB
  • BS Base Station
  • BTS Base Transceiver
  • a terminal may be used instead of the base station.
  • the base station it may be a relay device that relays the communication between the upper node and the terminal.
  • an embodiment of the present disclosure may be applied to any of an uplink, a downlink, and a side link, for example.
  • an embodiment of the present disclosure may be an uplink Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), a downlink Physical Downlink Shared Channel (PDSCH), or a Physical Downlink Control. It may be applied to Channel (PDCCH), Physical Broadcast Channel (PBCH), or Sidelink Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Control Channel (PSCCH), Physical Sidelink Broadcast Channel (PSBCH).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • PDSCH Physical Downlink Shared Channel
  • PSCH Physical Downlink Control Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • PDCCH, PDSCH, PUSCH, and PUCCH are examples of downlink control channel, downlink data channel, uplink data channel, and uplink control channel, respectively.
  • PSCCH and PSSCH are examples of a side link control channel and a side link data channel.
  • PBCH and PSBCH are examples of broadcast channels, and PRACH is an example of a random access channel.
  • Data channel / control channel One embodiment of the present disclosure may be applied to either a data channel or a control channel, for example.
  • the channel in one embodiment of the present disclosure may be replaced with any of the data channels PDSCH, PUSCH, PSSCH, or the control channels PDCCH, PUCCH, PBCH, PSCCH, PSBCH.
  • the reference signal is, for example, a signal known to both base stations and mobile stations, and may also be referred to as a reference signal (RS) or pilot signal.
  • the reference signal is Demodulation Reference Signal (DMRS), Channel State Information --Reference Signal (CSI-RS), Tracking Reference Signal (TRS), Phase Tracking Reference Signal (PTRS), Cell-specific Reference Signal (CRS), or Sounding. Any of the Reference Signal (SRS) may be used.
  • the unit of time resource is not limited to one or a combination of slots and symbols, for example, frame, superframe, subframe, slot, timeslot subslot, minislot or symbol, Orthogonal. It may be a time resource unit such as a Frequency Division Multiplexing (OFDM) symbol or a Single Carrier --Frequency Division Multiplexing (SC-FDMA) symbol, or it may be another time resource unit. Further, the number of symbols included in one slot is not limited to the number of symbols exemplified in the above-described embodiment, and may be another number of symbols.
  • OFDM Frequency Division Multiplexing
  • SC-FDMA Single Carrier --Frequency Division Multiplexing
  • One embodiment of the present disclosure may be applied to either a licensed band or an unlicensed band.
  • An embodiment of the present disclosure may be applied to any of communication between a base station and a terminal, communication between a terminal and a terminal (Sidelink communication, Uu link communication), and communication of Vehicle to Everything (V2X). good.
  • the channel in one embodiment of the present disclosure may be replaced with any of PSCCH, PSSCH, Physical Sidelink Feedback Channel (PSFCH), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, or PBCH.
  • one embodiment of the present disclosure may be applied to any of a terrestrial network, a satellite, or a non-terrestrial network (NTN: Non-Terrestrial Network) using a high altitude pseudo satellite (HAPS). .. Further, one embodiment of the present disclosure may be applied to a terrestrial network having a large transmission delay as compared with the symbol length and the slot length, such as a network having a large cell size and an ultra-wideband transmission network.
  • NTN Non-Terrestrial Network
  • HAPS high altitude pseudo satellite
  • an antenna port refers to a logical antenna (antenna group) composed of one or more physical antennas.
  • the antenna port does not necessarily refer to one physical antenna, but may refer to an array antenna or the like composed of a plurality of antennas.
  • the number of physical antennas that an antenna port is composed of is not specified, but may be specified as the minimum unit that a terminal station can transmit a reference signal.
  • the antenna port may also be defined as the smallest unit to multiply the weighting of the Precoding vector.
  • 5G fifth-generation mobile phone technology
  • NR wireless access technology
  • the system architecture is assumed to be NG-RAN (Next Generation-Radio Access Network) equipped with gNB as a whole.
  • the gNB provides the UE-side termination of the NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols.
  • SDAP NG radio access user plane
  • RRC control plane
  • the gNBs are connected to each other by an Xn interface.
  • gNB is converted to NGC (Next Generation Core) by the Next Generation (NG) interface, and more specifically, AMF (Access and Mobility Management Function) (for example, a specific core entity that performs AMF) by the NG-C interface.
  • NGC Next Generation Core
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • NG-U interface For example, a specific core entity that performs UPF
  • the NG-RAN architecture is shown in FIG. 19 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).
  • the NR user plane protocol stack (see, for example, 3GPP TS 38.300, section 4.4.1) is a PDCP (Packet Data Convergence Protocol (see Section 6.4 of TS 38.300)) sublayer, which is terminated on the network side in gNB. Includes RLC (RadioLinkControl (see Section 6.3 of TS38.300)) sublayer and MAC (Medium AccessControl (see Section 6.2 of TS38.300)) sublayer.
  • RLC RadioLinkControl
  • MAC Medium AccessControl
  • SDAP Service Data Adaptation Protocol
  • control plane protocol stack is defined for NR (see, for example, TS 38.300, section 4.4.2).
  • Layer 2 functionality is given in Section 6 of TS 38.300.
  • the functions of the PDCP sublayer, RLC sublayer, and MAC sublayer are listed in Sections 6.4, 6.3, and 6.2 of TS 38.300, respectively.
  • the functions of the RRC layer are listed in Section 7 of TS 38.300.
  • the Medium-Access-Control layer handles multiplexing of logical channels and scheduling and scheduling-related functions, including handling various numerologies.
  • the physical layer is responsible for coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources.
  • the physical layer also handles the mapping of transport channels to physical channels.
  • the physical layer provides services to the MAC layer in the form of transport channels. Physical channels correspond to a set of time-frequency resources used to transmit a particular transport channel, and each transport channel is mapped to the corresponding physical channel.
  • the physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) as upstream physical channels, and PDSCH (Physical Downlink Shared Channel) as downstream physical channels.
  • PDCCH Physical Downlink Control Channel
  • PBCH Physical Broadcast Channel
  • NR use cases / deployment scenarios include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communication (mMTC), which have diverse requirements in terms of data rate, latency, and coverage.
  • eMBB is expected to support peak data rates (20 Gbps on downlink and 10 Gbps on uplink) and user-experienced data rates as high as three times the data rates provided by IMT-Advanced. ..
  • URLLC more stringent requirements are imposed for ultra-low latency (0.5 ms for UL and DL respectively for user plane latency) and high reliability (1-10-5 within 1 ms).
  • mMTC preferably high connection densities (1,000,000 units / km2 of equipment in urban environments), wide coverage in adverse environments, and extremely long-life batteries (15 years) for low-cost equipment. Can be sought.
  • OFDM numerology suitable for one use case for example, subcarrier interval, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval
  • CP cyclic prefix
  • a low latency service preferably requires a shorter symbol length (and therefore a larger subcarrier interval) and / or a smaller number of symbols per scheduling interval (also referred to as TTI) than the mMTC service.
  • TTI time-to-Time to Physical channels
  • deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with short delay spreads.
  • the subcarrier spacing may be situationally optimized to maintain similar CP overhead.
  • the value of the subcarrier interval supported by NR may be one or more.
  • resource element can be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.
  • FIG. 20 shows the functional separation between NG-RAN and 5GC.
  • the logical node of NG-RAN is gNB or ng-eNB.
  • the 5GC has logical nodes AMF, UPF, and SMF.
  • gNB and ng-eNB host the following main functions: -Radio Bearer Control, Radio Admission Control, Connection Mobility Control, Dynamic allocation of resources to UEs on both uplink and downlink (scheduling), etc. Radio Resource Management function; -Data IP header compression, encryption, and integrity protection; -Selection of AMF when attaching the UE when it is not possible to determine the routing to AMF from the information provided by the UE; -Routing user plane data towards UPF; -Routing control plane information for AMF; -Set up and disconnect connections; -Scheduling and sending paging messages; -Scheduling and transmission of system notification information (sourced from AMF or Operation, Admission, Maintenance); -Measurement and measurement reporting settings for mobility and scheduling; -Transport level packet marking on the uplink; -Session management; -Network slicing support; -Management of QoS flows and mapping to data radio bearers; -Support for UEs in the RRC
  • the Access and Mobility Management Function hosts the following key functions: -Ability to terminate Non-Access Stratum (NAS) signaling; -NAS signaling security; -Access Stratum (AS) security control; -Core Network (CN) node-to-node signaling for mobility between 3GPP access networks; -Reachability to UE in idle mode (including control and execution of paging retransmission); -Registration area management; -Support for in-system mobility and inter-system mobility; -Access authentication; -Access approval including roaming permission check; -Mobility management control (subscription and policy); -Network slicing support; -Select Session Management Function (SMF).
  • NAS Non-Access Stratum
  • AS Access Stratum
  • CN Core Network
  • the User Plane Function hosts the following key functions: -Anchor point for intra-RAT mobility / inter-RAT mobility (if applicable); -External PDU (Protocol Data Unit) session point for interconnection with data networks; -Packet routing and forwarding; -Packet inspection and policy rule enforcement for the user plane part; -Traffic usage report; -Uplink classifier to support the routing of traffic flows to the data network; -Branching Point to support multi-homed PDU sessions; -Quos processing for the user plane (eg packet filtering, gating, UL / DL rate enforcement); -Verification of uplink traffic (mapping of SDF to QoS flow); -Downlink packet buffering and downlink data notification trigger function.
  • -Anchor point for intra-RAT mobility / inter-RAT mobility if applicable
  • -External PDU Protocol Data Unit
  • -Packet routing and forwarding -Packet inspection and policy rule enforcement for the user plane part
  • Session Management Function hosts the following key functions: -Session management; -IP address assignment and management for UEs; -UPF selection and control; -Traffic steering setting function in User Plane Function (UPF) for routing traffic to appropriate destinations; -Control policy enforcement and QoS; -Notification of downlink data.
  • RRC is an upper layer signaling (protocol) used to set UE and gNB.
  • AMF will prepare UE context data (which includes, for example, PDU session context, security key, UE RadioCapability, UESecurityCapabilities, etc.) and the initial context.
  • UE context data which includes, for example, PDU session context, security key, UE RadioCapability, UESecurityCapabilities, etc.
  • gNB activates AS security together with UE. This is done by the gNB sending a SecurityModeCommand message to the UE and the UE responding to the gNB with a SecurityModeComplete message.
  • the gNB sends an RRC Reconfiguration message to the UE, and the gNB receives the RRC Reconfiguration Complete from the UE for this, so that the signaling Radio Bearer 2 (SRB 2) and the Data Radio Bearer (DRB) are reconfigured to be set up. ..
  • SRB 2 Signaling Radio Bearer 2
  • DRB Data Radio Bearer
  • the steps for RRC Reconfiguration are omitted because SRB2 and DRB are not set up.
  • gNB notifies AMF that the setup procedure is completed by the initial context setup response (INITIALCONTEXTSETUPRESPONSE).
  • the control circuit that establishes the Next Generation (NG) connection with gNodeB during operation and the signaling radio bearer between gNodeB and the user equipment (UE: User Equipment) are set up so as to be NG during operation.
  • a 5th Generation Core (5GC) entity eg, AMF, SMF, etc.
  • gNodeB transmits RadioResourceControl (RRC) signaling including a resource allocation setting information element (IE: Information Element) to the UE via a signaling radio bearer. Then, the UE performs transmission on the uplink or reception on the downlink based on the resource allocation setting.
  • RRC RadioResourceControl
  • FIG. 22 shows some of the use cases for 5G NR.
  • the 3rd generation partnership project new radio (3GPP NR) considers three use cases envisioned by IMT-2020 to support a wide variety of services and applications.
  • the formulation of the first stage specifications for high-capacity and high-speed communication (eMBB: enhanced mobile-broadband) has been completed.
  • eMBB enhanced mobile-broadband
  • URLLC ultra-reliable and low-latency communications
  • mTC multi-concurrent machine type communications
  • Standardization for massive machine-type communications is included.
  • FIG. 22 shows some examples of conceptual use scenarios for IMT since 2020 (see, eg, ITU-R M. 2083 FIG. 2).
  • URLLC use cases have strict performance requirements such as throughput, latency, and availability.
  • the URLLC use case is envisioned as one of the elemental technologies for realizing these future applications such as wireless control of industrial production process or manufacturing process, telemedicine surgery, automation of power transmission and distribution in smart grid, traffic safety, etc. ing.
  • the ultra-high reliability of URLLC is supported by identifying technologies that meet the requirements set by TR 38.913.
  • the important requirement is that the latency of the target user plane is 0.5 ms for UL (uplink) and 0.5 ms for DL (downlink).
  • the general requirement of URLLC for one packet transmission is that when the latency of the user plane is 1 ms, the block error rate (BLER: block error rate) is 1E-5 for the packet size of 32 bytes.
  • BLER block error rate
  • the technological enhancement aimed at by NR URLLC aims to improve latency and reliability.
  • Technology enhancements to improve latency include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplinks, slot-level iterations in data channels, and And includes pre-emption on the downlink. Preemption means that a transmission that has already been allocated a resource is stopped and the already allocated resource is used for other transmissions with later requested lower latency / higher priority requirements. Therefore, a transmission that has already been permitted will be replaced by a later transmission. Preemption is applicable regardless of the specific service type. For example, the transmission of service type A (URLLC) may be replaced by the transmission of service type B (eMBB, etc.).
  • Technical enhancements for reliability improvement include a dedicated CQI / MCS table for the 1E-5 goal BLER.
  • a feature of the mMTC (massive machine type communication) use case is that the number of connected devices that transmit a relatively small amount of data, which is typically less susceptible to delays, is extremely large.
  • the device is required to be inexpensive and have a very long battery life. From an NR perspective, utilizing a very narrow bandwidth portion is one solution that saves power and allows for longer battery life from the perspective of the UE.
  • the 5G QoS (Quality of Service) model is based on a QoS flow, and a QoS flow (GBR: Guaranteed Bit Rate QoS flow) that requires a guaranteed flow bit rate and a guaranteed flow bit rate are required. Supports any non-GBR QoS flow (non-GBR QoS flow). Therefore, at the NAS level, QoS flow is the finest grain size QoS segment in a PDU session.
  • the QoS flow is specified in the PDU session by the QoS flow ID (QFI: QoS Flow ID) carried in the encapsulation header via the NG-U interface.
  • QFI QoS Flow ID
  • 5GC For each UE, 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearers (DRB) for the PDU session, eg, as shown above with reference to FIG. Also, an additional DRB for the QoS flow of the PDU session can be set later (when to set it depends on NG-RAN).
  • NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS level packet filters in UEs and 5GCs associate UL packets and DL packets with QoS flows, whereas AS level mapping rules in UEs and NG-RANs associate UL QoS flows and DL QoS flows with DRBs.
  • DRB Data Radio Bearers
  • FIG. 23 shows a non-roaming reference architecture of 5G NR (see TS 23.501 v16.1.0, section 4.23).
  • the Application Function (AF) (for example, the external application server that hosts the 5G service illustrated in FIG. 22) interacts with the 3GPP core network to provide the service. For example, accessing a Network Exposure Function (NEF) to support an application that affects traffic routing, or interacting with a policy framework for policy control (eg, QoS control) (Policy Control Function). (PCF)).
  • NEF Network Exposure Function
  • PCF Policy Control Function
  • the Application Function that is considered trusted by the operator can interact directly with the associated Network Function.
  • An Application Function that is not allowed direct access to the Network Function by the operator interacts with the relevant Network Function using the release framework to the outside via the NEF.
  • FIG. 23 shows a further functional unit of the 5G architecture, that is, Network Slice Selection Function (NSSF), Network Repository Function (NRF), Unified Data Management (UDM), Authentication Server Function (AUSF), Access and Mobility Management Function (AMF). , Session Management Function (SMF), and Data Network (DN, eg, service by operator, Internet access, or service by a third party). All or part of the core network functions and application services may be deployed and operated in a cloud computing environment.
  • NSSF Network Slice Selection Function
  • NRF Network Repository Function
  • UDM Unified Data Management
  • AUSF Authentication Server Function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • DN Data Network
  • the QoS requirement for at least one of the URLLC service, the eMMB service, and the mMTC service at the time of operation is set.
  • An application server eg, AF with 5G architecture
  • Each functional block used in the description of the above embodiment is partially or wholly realized as an LSI which is an integrated circuit, and each process described in the above embodiment is partially or wholly. It may be controlled by one LSI or a combination of LSIs.
  • the LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of functional blocks.
  • the LSI may include data input and output.
  • LSIs may be referred to as ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration.
  • the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells inside the LSI may be used.
  • FPGA Field Programmable Gate Array
  • the present disclosure may be realized as digital processing or analog processing.
  • the communication device may include a wireless transceiver and a processing / control circuit.
  • the wireless transceiver may include a receiver and a transmitter, or them as a function.
  • the radio transceiver (transmitter, receiver) may include an RF (Radio Frequency) module and one or more antennas.
  • the RF module may include an amplifier, an RF modulator / demodulator, or the like.
  • Non-limiting examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital stills / video cameras, etc.).
  • Digital players digital audio / video players, etc.
  • wearable devices wearable cameras, smart watches, tracking devices, etc.
  • game consoles digital book readers
  • telehealth telemedicines remote health Care / medicine prescription
  • vehicles with communication functions or mobile transportation automobiles, planes, ships, etc.
  • combinations of the above-mentioned various devices can be mentioned.
  • Communication devices are not limited to those that are portable or mobile, but are all types of devices, devices, systems that are non-portable or fixed, such as smart home devices (home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.), vending machines, and any other "Things” that can exist on the IoT (Internet of Things) network.
  • smart home devices home appliances, lighting equipment, smart meters or Includes measuring instruments, control panels, etc.
  • vending machines and any other “Things” that can exist on the IoT (Internet of Things) network.
  • Communication includes data communication by a combination of these, in addition to data communication by a cellular system, a wireless LAN system, a communication satellite system, etc.
  • the communication device also includes devices such as controllers and sensors that are connected or connected to communication devices that perform the communication functions described in the present disclosure.
  • devices such as controllers and sensors that are connected or connected to communication devices that perform the communication functions described in the present disclosure.
  • controllers and sensors that generate control and data signals used by communication devices that perform the communication functions of the communication device.
  • Communication devices also include infrastructure equipment that communicates with or controls these non-limiting devices, such as base stations, access points, and any other device, device, or system. ..
  • the terminal according to the embodiment of the present disclosure is based on a control circuit for controlling the transmission power of the side link based on information on a power control method according to the use of the communication link in the base station, and according to the control of the transmission power. It is provided with a transmission circuit for performing side link transmission.
  • the information includes a plurality of power control parameters for different uses.
  • the plurality of power control parameters are parameters related to transmission power based on path loss in the communication link.
  • the use of the communication link includes a downlink and an uplink
  • the plurality of power control parameters include individual parameters for the downlink and the uplink.
  • the use of the communication link includes a downlink and an uplink
  • the plurality of power control parameters include the downlink time resource, the uplink time resource, and the downlink.
  • the time resources available for the link and any of the uplinks include individual parameters.
  • a receiving circuit for receiving an upper layer signal that sets a power control parameter applied to the time resource of the side link transmission is further provided, and the control circuit is based on the upper layer signal. Then, one of the plurality of power control parameters is selected.
  • control circuit selects any one of the plurality of power control parameters based on information about a time resource allocation pattern in the communication link.
  • the allocation pattern comprises time resources corresponding to at least one of a downlink, an uplink, and a flexible link, the control circuit in the allocation pattern, the downlink, said. Select the power control parameter corresponding to a larger time resource among the time resources corresponding to the uplink and the flexible link.
  • control circuit selects the power control parameter based on the allocation pattern after the change of the flexible link to either the downlink or the uplink.
  • the information includes information about a power control formula according to the application.
  • the terminal controls the transmission power of the side link based on the information on the power control method according to the use of the communication link in the base station, and follows the control of the transmission power. , Perform side link transmission.
  • One embodiment of the present disclosure is useful for wireless communication systems.

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