WO2023238209A1 - Terminal et procédé de communication - Google Patents

Terminal et procédé de communication Download PDF

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Publication number
WO2023238209A1
WO2023238209A1 PCT/JP2022/022852 JP2022022852W WO2023238209A1 WO 2023238209 A1 WO2023238209 A1 WO 2023238209A1 JP 2022022852 W JP2022022852 W JP 2022022852W WO 2023238209 A1 WO2023238209 A1 WO 2023238209A1
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WIPO (PCT)
Prior art keywords
lbt
signal
terminal
terminals
communication
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PCT/JP2022/022852
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English (en)
Japanese (ja)
Inventor
翔平 吉岡
尚哉 芝池
聡 永田
Original Assignee
株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to PCT/JP2022/022852 priority Critical patent/WO2023238209A1/fr
Publication of WO2023238209A1 publication Critical patent/WO2023238209A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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

  • D2D reduces traffic between terminals and base stations, and enables communication between terminals even if the base station becomes unable to communicate during a disaster or the like.
  • 3GPP 3rd Generation Partnership Project
  • D2D is referred to as "sidelink,” but in this specification, the more general term D2D is used. However, in the description of the embodiments to be described later, side links will also be used as necessary.
  • LBT Listen Before Talk
  • the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (for example, Flexible Duplex, etc.). This method may also be used.
  • configure the wireless parameters etc. may mean pre-configuring a predetermined value, or may mean that the base station 10 or Wireless parameters notified from the terminal 20 may also be set.
  • the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, the communication device may be a base station, RSU, relay station (relay node), It may also be a terminal or the like that has scheduling capability.
  • OFDM Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic-Prefix OFDM
  • DFT-S-OFDM Discrete Fourier Transform-Spread-OFDM
  • OFDM without Transform precoding or Transform rm precoded Any of the following OFDM methods may be applied.
  • Mode 1 and Mode 2 are defined regarding SL resource allocation to the terminal 20.
  • transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20.
  • DCI Downlink Control Information
  • SL-CG Sidelink Configured Grant
  • the terminal 20 autonomously selects a transmission resource from the resource pool based on a reservation signal transmitted from another terminal 20 (sidelink sensing).
  • the slot in the embodiment of the present invention may be read as a symbol, minislot, subframe, radio frame, or TTI (Transmission Time Interval).
  • a cell in an embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.
  • the terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication.
  • the terminal 20 may be a terminal owned by a user such as a smartphone, or may be an IoT (Internet of Things) device such as a smart meter.
  • IoT Internet of Things
  • 3GPP Release 16 or Release 17 sidelinks are specified for 1) and 2) shown below.
  • unlicensed bands such as the 5GHz-7GHz band and the 60GHz band.
  • FIG. 2 is a diagram showing an example of frequency bands used in a wireless communication system.
  • FR Frequency range
  • SCS Sub carrier spacing
  • FR2-1 is a frequency band from 24.25 GHz to 52.6 GHz, SCS uses 60, 120 or 240 kHz, and the bandwidth is 50 MHz to 400 MHz. As shown in FIG. 2, FR2-2 may range from 52.6 GHz to 71 GHz. Furthermore, it may be envisaged to support frequency bands above 71 GHz.
  • CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplexing
  • DFT-S-OFDM Discrete Fourier Transform-Spread
  • SCS Sub-Carrier Spacing
  • examples of unlicensed bands in the 5GHz-7GHz band include 5.15GHz to 5.35GHz, 5.47GHz to 5.725GHz, 5.925GHz and above, etc.
  • LBT Listen before talk
  • the base station 10 or terminal 20 performs power detection during a predetermined period immediately before transmitting, and if the power exceeds a certain value, that is, if transmission from another device is detected, the base station 10 or terminal 20 stops transmitting (this is called LBT failure).
  • a maximum channel occupancy time is defined. MCOT is the maximum time interval during which transmission is allowed to continue when transmission is started after LBT, and is, for example, 4 ms in Japan.
  • Occupied Channel Bandwidth when a certain carrier bandwidth is used for transmission, X% or more of the band must be used. For example, in Europe, it is required to use 80% to 100% of NCB (Nominal channel bandwidth). The OCB requirement aims to ensure that channel access power detection is performed correctly.
  • maximum transmission power and maximum power spectral density it is stipulated that transmission be performed at or below a predetermined transmission power in order to avoid excessive interference.
  • the maximum transmission power is 23 dBm in the 5150 MHz-5350 MHz band.
  • the maximum power spectral density is 10 dBm/MHz in the 5150 MHz-5350 MHz band.
  • LBT is executed when accessing a channel.
  • the base station 10 or the terminal 20 performs power detection during a predetermined period immediately before transmitting, and stops transmitting when the power exceeds a certain value, that is, when detecting transmission from another device.
  • a certain value that is, when detecting transmission from another device.
  • maximum transmission power and maximum power spectral density it is specified that transmission is performed at a predetermined transmission power or less. It is also stipulated that it has the ability to meet OCB requirements.
  • NR In NR, the following four types of channel access procedures are defined based on differences in the behavior of LBT in the time direction (period in which sensing is performed). Note that this sensing is a different operation from the above-mentioned side link sensing, and will be described as LBT sensing for distinction.
  • Type 1 Perform variable time LBT sensing before transmission. Also called Category 4 LBT.
  • Type 2A 25 ⁇ s LBT sensing is performed before transmission.
  • Type 2B 16 ⁇ s LBT sensing is performed before transmission.
  • Type 2C Start transmission without LBT. Similar to sending license bands.
  • FIG. 3 is a diagram for explaining example (1) of LBT.
  • FIG. 3 is an example of a type 1 channel access procedure.
  • Type 1 is further classified into four classes indicating channel access priority classes (CAPC) based on differences in LBT sensing length. LBT sensing is performed in the following two periods.
  • CAC channel access priority classes
  • the first period is a prioritization period or defer duration, and has a length of 16+9 ⁇ m p [ ⁇ s].
  • a fixed value is defined for m p for each channel access priority class.
  • the second period is a backoff procedure and has a length of 9 ⁇ N [ ⁇ s].
  • the value of N is randomly determined from a certain range (see CWS adjustment procedure in Non-Patent Document 4).
  • N is the initial value of the backoff counter, and the value of the backoff counter decreases by 1 each time the power of a signal from another device is not detected for 9 [ ⁇ s].
  • FIG. 4 is a diagram for explaining example (2) of LBT.
  • FIG. 4 is an example of a type 2A or type 2B channel access procedure without random backoff.
  • a gap for power detection of 25 ⁇ s for type 2A and 16 ⁇ s for type 2B is set before transmission.
  • FIG. 5 is a diagram for explaining example (3) of LBT.
  • FIG. 5 is an example of a type 2C channel access procedure. As shown in FIG. 5, no power detection is performed before transmission, and transmission is performed immediately after a gap of no more than 16 ⁇ s. The transmission period may be up to 584 ⁇ s.
  • m p , CW p,min , and CW p,max are determined according to the channel access priority class p.
  • the LBT period is calculated from Table 1 to be a minimum of 34 ⁇ s and a maximum of 88 ⁇ s.
  • the LBT period is calculated from Table 1 to be a minimum of 34 ⁇ s and a maximum of 160 ⁇ s.
  • the LBT period is calculated from Table 1 to be a minimum of 43 ⁇ s and a maximum of 9286 ⁇ s.
  • p is 4
  • the LBT period is calculated from Table 1 to be a minimum of 79 ⁇ s and a maximum of 9286 ⁇ s. Note that Table 1 is a table used for UL.
  • the LBT type and channel access priority class may be determined based on notification from the base station 10, channel type, etc.
  • the gap of 25 ⁇ s or 16 ⁇ s may be set by the base station 10 in consideration of TA (Timing Advance) and CP extension.
  • LBT is a function to detect transmissions outside the system and avoid collisions, and it is not necessary to detect transmissions from other terminals 20 within the system by LBT, but as mentioned above, it is desirable to detect transmissions from other terminals 20 within the system. Otherwise, a transmission stop will occur.
  • the base station performs resource management, so the case shown in FIG. 7 does not occur due to transmission within the system.
  • resource allocation mode 2 for sidelink communication resources to be used by each terminal are determined, so the case shown in FIG. 7 can easily occur even in transmission within the system.
  • the terminal 20 may perform a predetermined operation based on the type of signal regarding the operation related to detecting a signal of another device that is executing LBT type 1.
  • FIG. 8 is a diagram for explaining an example (1) of direct communication between terminals in the embodiment of the present invention.
  • the UE-X when the UE-X detects a signal from another SL-UE, the UE-X may continue counting the back-off counter.
  • the other SL-UE signals may be PSCCH, PSSCH, PSFCH, S-SSB or SL positioning RS. For example, if the UE-X attempts to decode these signals and successfully detects them, it may continue counting the backoff counter.
  • the UE-X does not need to perform LBT in the time period in which signals from other SL-UEs are transmitted. Furthermore, after detecting a signal from another device while executing LBT type 1, the UE-X may execute LBT during the process of detecting whether the signal is a signal from another SL-UE. , it is not necessary to perform LBT from the time it is detected that the signal is from another SL-UE. Further, the UE-X may continue counting the back-off counter and perform LBT immediately after the signal transmission of another SL-UE ends, without providing a hold period.
  • the UE-X After the UE-X detects a signal from another device during LBT type 1 execution, during the process of detecting whether or not the signal is a signal from another SL-UE, the UE-X counts the back-off counter in parallel.
  • the backoff counter value at the time of detecting the signal may be held. That is, in a time period in which it is not determined whether the signal is from another SL-UE, that is, a signal within the system, or a signal from another system such as a wireless LAN, the UE-X In parallel, the backoff counter value at the time of detecting the signal may be held.
  • a simple configuration can be achieved by performing the operation on the SL signal that can be transmitted in a short time interval on the assumption that it has been transmitted.
  • the UE-X may stop counting the back-off counter.
  • the value when the back-off counter stops counting may mean the back-off counter value at the time when a signal from another device is detected.
  • the value when the backoff counter stops counting is "111" shown in FIG. It may be a value.
  • the UE-X When the UE-X performs resource selection and applies LBT type 1 to transmission on the newly selected resource, the UE-X restarts counting the backoff counter from the value when counting was stopped and performs LBT. may be executed. Candidates for resource selection may be determined based on the value when the backoff counter stops counting. For example, a resource that cannot perform LBT by restarting counting of the backoff counter from the value when counting of the backoff counter was stopped may not be selected as a candidate for resource selection, or may be excluded from the candidates. good.
  • LBT type 1 when a signal from another system is detected, LBT type 1 can be executed.
  • the UE-X may perform action 1) or action 2). For example, if (QP) is greater than or equal to a predetermined value or exceeds a predetermined value, the UE-X may perform operation 3).
  • the predetermined value may be a threshold value used for signal detection in LBT when a signal from another SL-UE is not detected, a value based on the threshold value, or a setting or preset value. It may be a value determined by
  • Operation 5 Whether or not the above-mentioned operations 1), 2), 3) and 4) are applied and parameters related to the operations may be set or preset, and each operation may be determined and/or based on the parameters. May be executed.
  • Operation 6 Whether or not the above operations 1), 2), 3), and 4) are applied and the UE capabilities related to the operations may be defined.
  • the UE capabilities may or may not be reported to the gNB and/or the UE.
  • the above actions 1) to 6) may be applied only when a notification related to COT sharing cannot be detected, or may be applied only when COT sharing is not applied. good.
  • the above embodiment may be applied only when predetermined conditions are met. For example, it may be applied in connection with a given SL channel or SL signal. For example, this embodiment may be applied to any one of PSCCH/PSSCH, PSFCH, S-SSB, and SL positioning RS. For example, it may be applied based on predetermined settings or pre-settings. For example, in a resource pool, this embodiment may be applied when "validation" of this embodiment is given by setting or pre-setting.
  • additional transmission such as CP extension, may be performed immediately before transmission P.
  • the above embodiments are not limited to V2X terminals, but may be applied to terminals that perform D2D communication.
  • LBT Listen before talk
  • Base station 10 and terminal 20 include functionality to implement the embodiments described above. However, the base station 10 and the terminal 20 may each have only some of the functions in the embodiment.
  • FIG. 10 is a diagram showing an example of the functional configuration of the base station 10.
  • base station 10 includes a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140.
  • the functional configuration shown in FIG. 10 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.
  • the transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information on a higher layer from the received signals. Further, the transmitter 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signal, DL reference signal, etc. to the terminal 20.
  • the setting unit 130 stores preset setting information and various setting information to be sent to the terminal 20 in a storage device, and reads them from the storage device as necessary.
  • the content of the setting information is, for example, information related to the setting of D2D communication.
  • control unit 140 performs processing related to settings for the terminal 20 to perform D2D communication. Further, the control unit 140 transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmitting unit 110. Further, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the reception unit 120.
  • a functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.
  • the transmitter 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and obtains higher layer signals from the received physical layer signals. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, reference signals, etc. transmitted from the base station 10.
  • the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) to another terminal 20 as D2D communication.
  • the receiving unit 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from other terminals 20 .
  • the control unit 240 controls D2D communication to establish an RRC connection with another terminal 20. Further, the control unit 240 performs processing related to power saving operation. Further, the control unit 240 performs processing related to HARQ for D2D communication and DL communication. Further, the control unit 240 transmits to the base station 10 information related to HARQ responses for D2D communication and DL communication scheduled from the base station 10 to other terminals 20. Further, the control unit 240 may schedule D2D communication for other terminals 20. Further, the control unit 240 may autonomously select a resource to be used for D2D communication from the resource selection window based on the result of side link sensing, or may perform re-evaluation or preemption.
  • each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices.
  • the functional block may be realized by combining software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't.
  • a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.
  • the base station 10, terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • FIG. 12 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure.
  • the base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. Good too.
  • the word “apparatus” can be read as a circuit, a device, a unit, etc.
  • the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.
  • Each function in the base station 10 and the terminal 20 is performed by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls communication by the communication device 1004. This is realized by controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.
  • the processor 1001 for example, operates an operating system to control the entire computer.
  • the processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like.
  • CPU central processing unit
  • control unit 140, control unit 240, etc. may be implemented by the processor 1001.
  • the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes in accordance with these.
  • programs program codes
  • the control unit 140 of the base station 10 shown in FIG. 10 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001.
  • the control unit 240 of the terminal 20 shown in FIG. 11 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001.
  • Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.
  • the storage device 1002 is a computer-readable recording medium, such as at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured.
  • the storage device 1002 may be called a register, cache, main memory, or the like.
  • the storage device 1002 can store executable programs (program codes), software modules, and the like to implement a communication method according to an embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray disk, etc.). -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, etc.
  • the above-mentioned storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or other suitable medium.
  • the base station 10 and the terminal 20 also include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA).
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA field programmable gate array
  • a part or all of each functional block may be realized by the hardware.
  • processor 1001 may be implemented using at least one of these hardwares.
  • FIG. 13 shows an example of the configuration of the vehicle 2001.
  • the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, a front wheel 2007, a rear wheel 2008, an axle 2009, an electronic control unit 2010, and various sensors 2021 to 2029. , an information service section 2012 and a communication module 2013.
  • Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, may be applied to communication module 2013.
  • the electronic control unit 2010 is composed of a microprocessor 2031, memory (ROM, RAM) 2032, and communication port (IO port) 2033. Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010.
  • the electronic control unit 2010 may also be called an ECU (Electronic Control Unit).
  • the information service department 2012 controls various devices such as car navigation systems, audio systems, speakers, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It is composed of one or more ECUs.
  • the information service unit 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from an external device via the communication module 2013 and the like.
  • the information service department 2012 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).
  • Communication module 2013 can communicate with microprocessor 2031 and components of vehicle 2001 via a communication port.
  • the communication module 2013 communicates with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, electronic Data is transmitted and received between the microprocessor 2031, memory (ROM, RAM) 2032, and sensors 2021 to 29 in the control unit 2010.
  • the communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, various information is transmitted and received with an external device via wireless communication.
  • the communication module 2013 may be located either inside or outside the electronic control unit 2010.
  • the external device may be, for example, a base station, a mobile station, or the like.
  • the communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 2012 provided in the vehicle 2001.
  • the information service unit 2012 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013). may be called.
  • Communication module 2013 also stores various information received from external devices into memory 2032 that can be used by microprocessor 2031 . Based on the information stored in the memory 2032, the microprocessor 2031 controls the drive section 2002, steering section 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheel 2007, rear wheel 2008, and axle 2009 provided in the vehicle 2001. , sensors 2021 to 2029, etc. may be controlled.
  • the control unit when transmitting a signal for direct communication between terminals to another terminal in an unlicensed band, before transmitting the signal for direct communication between terminals, It has a control unit that executes LBT (Listen before talk), and a transmission unit that transmits a signal for direct communication between the terminals to the other terminal when the LBT is successful, and the control unit executes the LBT.
  • LBT Listen before talk
  • the control unit executes the LBT.
  • a terminal After starting, when a certain signal is detected, a terminal is provided that executes processing related to the backoff counter of the LBT based on the type of the certain signal.
  • LBT Listen before talk
  • control unit may continue counting the back-off counter if a signal of direct communication between other terminals is detected.
  • the control unit After starting the LBT, the control unit does not need to execute the LBT during a time period in which a signal of direct communication between other terminals is being detected. With this configuration, it is possible to appropriately detect transmissions from other systems in an unlicensed band, and at the same time, perform efficient LBT for SL transmission.
  • the control unit controls a backoff counter value at the time when the certain signal is detected while detecting whether the certain signal is a signal for direct communication between other terminals. May be retained. With this configuration, it is possible to appropriately detect transmissions from other systems in an unlicensed band, and at the same time, perform efficient LBT for SL transmission.
  • Each aspect/embodiment described in this disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system). system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is an integer or decimal number, for example)), FRA (Future Radio Access), NR (new Radio), New radio access ( NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802 Systems that utilize .16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, and that are extended, modified, created, and defined based on these.
  • the present invention may be
  • the base station 10 may be performed by its upper node in some cases.
  • various operations performed for communication with a terminal 20 are performed by the base station 10 and other network nodes other than the base station 10. It is clear that this can be done by at least one of the following: for example, MME or S-GW (possible, but not limited to).
  • MME Mobility Management Entity
  • S-GW Packet Control Function
  • the other network node may be a combination of multiple other network nodes (for example, MME and S-GW).
  • software, instructions, information, etc. may be sent and received via a transmission medium.
  • a transmission medium For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create a website, When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • At least one of the channel and the symbol may be a signal.
  • the signal may be a message.
  • a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
  • Base Station BS
  • wireless base station base station
  • base station fixed station
  • NodeB eNodeB
  • gNodeB gNodeB
  • a base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). Communication services can also be provided by Remote Radio Head).
  • RRHs small indoor base stations
  • Communication services can also be provided by Remote Radio Head).
  • the term "cell” or “sector” refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.
  • the base station transmitting information to the terminal may be read as the base station instructing the terminal to control/operate based on the information.
  • MS Mobile Station
  • UE User Equipment
  • At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, etc.
  • the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like.
  • the moving body refers to a movable object, and the moving speed is arbitrary. Naturally, this also includes cases where the moving object is stopped.
  • the mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships and other watercraft.
  • the mobile object may be a mobile object that autonomously travels based on a travel command. It may be a vehicle (e.g. car, airplane, etc.), an unmanned moving object (e.g. drone, self-driving car, etc.), or a robot (manned or unmanned). good.
  • the base station and the mobile station includes devices that do not necessarily move during communication operations.
  • at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be replaced by a user terminal.
  • communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
  • the terminal 20 may have the functions that the base station 10 described above has.
  • words such as "up” and “down” may be replaced with words corresponding to inter-terminal communication (for example, "side”).
  • uplink channels, downlink channels, etc. may be replaced with side channels.
  • the user terminal in the present disclosure may be replaced with a base station.
  • the base station may have the functions that the user terminal described above has.
  • determining may encompass a wide variety of operations.
  • “Judgment” and “decision” include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a “judgment” or “decision.”
  • judgment and “decision” refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access.
  • (accessing) may include considering something as a “judgment” or “decision.”
  • judgment and “decision” refer to resolving, selecting, choosing, establishing, comparing, etc. as “judgment” and “decision”. may be included.
  • judgment and “decision” may include regarding some action as having been “judged” or “determined.”
  • judgment (decision) may be read as “assuming", “expecting", “considering”, etc.
  • connection refers to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled.”
  • the bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be replaced with "access.”
  • two elements may include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applied standard.
  • RS Reference Signal
  • the phrase “based on” does not mean “based solely on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to elements using the designations "first,” “second,” etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.
  • a radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • a slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain.
  • a slot may be a unit of time based on numerology.
  • a slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot.
  • PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A.
  • PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
  • one subframe may be called a transmission time interval (TTI)
  • TTI transmission time interval
  • multiple consecutive subframes may be called a TTI
  • one slot or one minislot may be called a TTI. It's okay.
  • at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be.
  • the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.
  • the TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.
  • a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more continuous subcarriers in the frequency domain.
  • the number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example.
  • the number of subcarriers included in an RB may be determined based on newerology.
  • one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.
  • PRBs physical resource blocks
  • SCGs sub-carrier groups
  • REGs resource element groups
  • PRB pairs RB pairs, etc. May be called.
  • a resource block may be configured by one or more resource elements (REs).
  • REs resource elements
  • 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • a bandwidth part (which may also be called a partial bandwidth or the like) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier.
  • the common RB may be specified by an RB index based on a common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • the BWP may include a UL BWP (UL BWP) and a DL BWP (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or more BWPs may be configured for the terminal 20 within one carrier.
  • Base station 110 Transmitting section 120 Receiving section 130 Setting section 140 Control section 20 Terminal 210 Transmitting section 220 Receiving section 230 Setting section 240 Control section 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Driving part 2003 Restoration Part 2004 Axel Pedal 2005 Brake Pedal 2006 Shift Lever 2007 Front wheels 2008 Bearing 2009 Axis 2010 Electronic Control Division 2012 Electronic Control Division 20133 Communication Modular 2021 Current sensor 2022 Round Sensor 2023 Air pressure sensor 2024 vehicle speed Sensen Sa 2025 acceleration sensor 2026 brake Pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system section 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Le terminal selon l'invention comprend : une unité de commande qui exécute une opération d'écoute avant de parler (LBT) avant de transmettre un signal pour une communication directe entre des terminaux, lors de la transmission du signal pour une communication directe entre des terminaux vers un autre terminal, dans des bandes sans licence ; et une unité de transmission qui transmet le signal pour une communication directe entre des terminaux vers l'autre terminal, lorsque la LBT est réussie ; lorsqu'un certain signal est détecté après le début de la LBT, l'unité de commande exécute un processus associé au compteur d'attente de la LBT sur la base du type du certain signal.
PCT/JP2022/022852 2022-06-06 2022-06-06 Terminal et procédé de communication WO2023238209A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017038217A1 (fr) * 2015-08-31 2017-03-09 ソニー株式会社 Dispositif de communication et procédé de communication
WO2018078966A1 (fr) * 2016-10-24 2018-05-03 ソニー株式会社 Dispositif de traitement d'informations et procédé de commande de transmission de signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017038217A1 (fr) * 2015-08-31 2017-03-09 ソニー株式会社 Dispositif de communication et procédé de communication
WO2018078966A1 (fr) * 2016-10-24 2018-05-03 ソニー株式会社 Dispositif de traitement d'informations et procédé de commande de transmission de signal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NOKIA NETWORKS: "On LAA DL LBT design enabling frequency reuse", 3GPP TSG-RAN WG1#83, R1-157130, 15 November 2015 (2015-11-15), XP051003397 *
VIVO: "Channel access mechanism for sidelink on unlicensed spectrum", 3GPP TSG RAN WG1#109-E R1-2203561, 29 April 2022 (2022-04-29), XP052153036 *

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