WO2022230047A1 - Terminal et procédé de communication - Google Patents

Terminal et procédé de communication Download PDF

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Publication number
WO2022230047A1
WO2022230047A1 PCT/JP2021/016777 JP2021016777W WO2022230047A1 WO 2022230047 A1 WO2022230047 A1 WO 2022230047A1 JP 2021016777 W JP2021016777 W JP 2021016777W WO 2022230047 A1 WO2022230047 A1 WO 2022230047A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
base station
terminal
information
doppler estimation
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PCT/JP2021/016777
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English (en)
Japanese (ja)
Inventor
翔一 樋口
知也 小原
真哉 岡村
朋樹 横川
拓真 中村
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 JP2023516895A priority Critical patent/JPWO2022230047A1/ja
Priority to PCT/JP2021/016777 priority patent/WO2022230047A1/fr
Publication of WO2022230047A1 publication Critical patent/WO2022230047A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a terminal and communication method in a wireless communication system.
  • NR New Radio
  • LTE Long Term Evolution
  • 6G the next-generation wireless communication method of 5G has begun, and it is expected that wireless quality exceeding that of 5G will be realized.
  • 6G we aim to realize further large capacity, use of new frequency bands, further reduction of delay, further high reliability, expansion of coverage in new areas (high altitude, sea, space), etc. are being considered.
  • the Doppler fluctuation will be very large, so the structure of a reference signal such as a conventional TRS will interfere with Doppler estimation, resulting in a reception error. rate may be excessive.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a reference signal suitable for Doppler estimation in a wireless communication system.
  • a transmitting unit that transmits information related to intervals in the time domain of reference signals to a base station; and a controller that receives the reference signal from the base station and performs Doppler estimation based on the radio parameter.
  • FIG. 1 is a diagram showing a configuration example of a radio communication system according to an embodiment of the present invention
  • FIG. FIG. 3 is a diagram showing an arrangement example (1) of reference signals
  • FIG. 10 is a diagram showing an arrangement example (2) of reference signals
  • FIG. 11 is a diagram (1) for explaining Doppler estimation
  • FIG. 2 is a diagram (2) for explaining Doppler estimation
  • FIG. 3 is a diagram (3) for explaining Doppler estimation
  • 4 is a sequence diagram showing an operation example in the embodiment of the present invention
  • FIG. FIG. 4 is a diagram for explaining determination related to Doppler estimation according to the embodiment of the present invention
  • FIG. It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention.
  • 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention
  • FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced and subsequent systems (eg, NR) unless otherwise specified.
  • SS Synchronization signal
  • PSS Primary SS
  • SSS Secondary SS
  • PBCH Physical broadcast channel
  • PRACH Physical random access channel
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex etc.) method may be used.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • "configuring" wireless parameters and the like may mean that predetermined values are preset (Pre-configure), and the base station 10 or A wireless parameter notified from the terminal 20 may be set.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention.
  • a wireless communication system according to an embodiment of the present invention includes a base station 10 and terminals 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example and there may be more than one.
  • the base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. Physical resources of radio signals are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. good too.
  • the base station 10 transmits synchronization signals and system information to the terminal 20 . Synchronization signals are, for example, NR-PSS and NR-SSS.
  • the system information is transmitted by, for example, NR-PBCH, and is also called broadcast information.
  • the synchronization signal and system information may be called SSB (SS/PBCH block). As shown in FIG.
  • the base station 10 transmits control signals or data to the terminal 20 on DL (Downlink) and receives control signals or data from the terminal 20 on UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Also, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Also, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell (PSCell) of another base station 10 by DC (Dual Connectivity).
  • SCell Secondary Cell
  • PCell Primary Cell
  • the terminal 20 is a communication device with a wireless communication function, such as a smartphone, mobile phone, tablet, wearable terminal, or M2M (Machine-to-Machine) communication module. As shown in FIG. 1 , the terminal 20 receives control signals or data from the base station 10 on the DL and transmits control signals or data to the base station 10 on the UL, thereby performing various functions provided by the wireless communication system. Use communication services.
  • a wireless communication function such as a smartphone, mobile phone, tablet, wearable terminal, or M2M (Machine-to-Machine) communication module.
  • M2M Machine-to-Machine
  • future network systems such as 6G are expected to use even higher frequencies than 5G in order to further improve communication speed, communication capacity, reliability, delay performance, etc.
  • speed of transportation is increasing further, for example, linear motor cars, it is expected that there will be a transportation that far exceeds the operating speed of existing transportation. Therefore, future network systems are expected to be used in high-speed moving environments exceeding conventional moving speeds.
  • the Doppler effect can be cited as a factor that adversely affects communication quality. Since the magnitude of the Doppler effect is proportional to frequency and speed, it is assumed that future networks such as 6G will have a larger Doppler effect to consider than 5G.
  • TRS Tracking reference signal
  • TRS is used for time domain and frequency domain tracking.
  • the TRS may be referred to as CSI-RS (Channel state information Reference signal for tracking) for tracking and may be configured as a 1-port periodic CSI-RS with a frequency density of 3.
  • CSI-RS Channel state information Reference signal for tracking
  • the TRS may be configured in either form of 1) and 2) below. 1) 1-slot TRS: 2 CSI-RS resources are arranged in 1 slot and uses 2 OFDM symbols 2) 2-slot TRS: 2 CSI-RS resources are arranged in each of 2 consecutive slots, total Uses 4 CSI-RS resources
  • the symbols in which the TRSs are arranged may be multiplexed in a time-division manner with a 4-symbol separation in the slot.
  • the transmission bandwidth in which the TRS is placed may be the smaller of 52 resource blocks or the BWP size or the BWP size.
  • the period of the TRS may be set to 10ms, 20ms, 40ms or 80ms.
  • FIG. 2 is a diagram showing an arrangement example (1) of reference signals.
  • FIG. 2 shows an example of arrangement of 1-slot TRSs, in which TRSs are arranged at OFDM symbol positions ⁇ 5, 9 ⁇ in the slot.
  • FIG. 3 is a diagram showing an arrangement example (2) of reference signals.
  • FIG. 3 shows an example of arrangement of 2-slot TRSs, in which TRSs are arranged at positions ⁇ 4, 8 ⁇ of OFDM symbols within a slot.
  • FIG. 4 is a diagram (1) for explaining Doppler estimation.
  • the receiver performs Doppler estimation based on the reception results of the reference signals at two different timings. As shown in FIG. 4, the phases of RS1 arranged in OFDM symbol #5 and RS2 arranged in OFDM symbol #9 are compared. If there is no phase difference between the two reference signals, it can be assumed that there is no Doppler variation. On the other hand, in the presence of Doppler variations, Doppler estimation can be performed based on the phase rotation observed in the two reference signals.
  • FIG. 5 is a diagram (2) for explaining Doppler estimation. If the time interval between the two reference signals is too large, the phase rotation will be too large, making Doppler estimation difficult. In particular, the phase rotation cannot be measured correctly in an environment where the phase difference exceeds +180 degrees to -180 degrees. For example, in FIG. 5, it is unclear which phase rotation is ⁇ , ⁇ +360, ⁇ +360*2, ⁇ +360*3, . becomes.
  • FIG. 6 is a diagram (3) for explaining Doppler estimation. If the time interval between the two reference signals is too small, the Doppler estimation accuracy is degraded in a noisy environment because the phase rotation ⁇ is small as shown in FIG.
  • Doppler estimation is performed using a reference signal. Since the Doppler fluctuation changes in magnitude with time, the time interval of the reference signal is an important factor. For example, in an environment with large Doppler fluctuations, it is necessary to shorten the time interval of the reference signal.
  • the terminal 20 notifies the network whether or not Doppler estimation is possible at the time interval of the reference signal used for Doppler estimation.
  • the terminal 20 notifies the network whether or not to change the time interval of the reference signal used for Doppler estimation.
  • the network notifies the terminal 20 of the switching of radio parameters based on the notification of A) and/or B) notified from the terminal 20 .
  • FIG. 7 is a sequence diagram showing an operation example in the embodiment of the present invention.
  • the terminal 20 in response to a request from the base station 10, the terminal 20 sends a UE capability report including information indicating whether or not the terminal 20 supports the notification of the above A) and/or the above B). may be sent to Step S1 may or may not be performed.
  • step S2 the terminal 20 transmits information related to Doppler estimation to the base station 10.
  • the information related to Doppler estimation may be the notification of A) and/or B) above.
  • step S3 the base station 10 transmits to the terminal 20 information about the radio parameters switched based on the received information about Doppler estimation.
  • subsequent step S4 the terminal 20 receives the reference signal based on the switched radio parameters and performs Doppler estimation.
  • subsequent step S5 the terminal 20 receives data after correction based on the Doppler estimation.
  • the terminal 20 may notify the network whether or not Doppler estimation is possible at time intervals of reference signals used for Doppler estimation based on certain radio parameter settings. Also, the terminal 20 may notify the network whether or not Doppler estimation is possible at the time intervals of the currently received reference signal used for Doppler estimation. The terminal 20 may also notify the network of how much margin or excess there is for correctable Doppler fluctuations.
  • FIG. 8 is a diagram for explaining determination related to Doppler estimation according to the embodiment of the present invention.
  • the terminal 20 calculates a correctable Doppler fluctuation from the time interval of the received reference signal used for Doppler estimation, determines whether Doppler estimation is possible based on the correctable Doppler fluctuation, and notifies the network. You may For example, the terminal 20 calculates the Doppler fluctuation in the environment of the device itself, and as shown in FIG. If the Doppler variation in the environment of the device is larger than the Doppler variation that can be corrected, it may be determined that Doppler estimation is impossible.
  • the terminal 20 may notify the network whether to change the time interval of the reference signal used for Doppler estimation.
  • the notice may force the change or recommend the change.
  • the terminal 20 may also notify the network of how much margin or excess there is for correctable Doppler fluctuations.
  • the terminal 20 may calculate a correctable Doppler fluctuation from the time interval of the received reference signal used for Doppler estimation, determine whether to change the time interval of the reference signal, and notify the network. .
  • the terminal 20 may notify the network of a specific instruction indicating how to change the time interval of the reference signal used for Doppler estimation. For example, as a method of changing the time interval of the reference signal, it may be reported that the symbol interval of the reference signal is reduced or increased from the current interval, or the number of symbols to be decreased or the number of symbols to be increased is notified. good too. Also, it may be notified that the SCS (Subcarrier spacing) of the reference signal should be decreased or increased from the current SCS, or which SCS should be used.
  • the specific instruction may be one of the symbol interval instruction and the SCS instruction, or may be a plurality of instructions.
  • the terminal 20 may notify the network of an instruction to set the SCS to 30 kHz. For example, if the current symbol interval is 20 ms and the SCS is 15 kHz, terminal 20 may signal the network to indicate a symbol interval of 5 ms and an SCS of 60 kHz.
  • the network may notify the terminal 20 of the wireless parameter switching based on the notification from the terminal 20 by A) and/or B).
  • Table 1 is an example of radio parameters corresponding to correctable Doppler variations.
  • Radio parameters corresponding to correctable Doppler variations may be grouped as shown in Table 1. By assigning an index to the group and notifying the terminal 20 of the index, the switching of the wireless parameter may be notified to the terminal 20 .
  • the SCS YkHz, the reference signal time interval Zms, and the correctable Doppler variation AHz may be specified by one index.
  • the radio parameters with index #0 are an example corresponding to an SCS of 120 kHz and a reference signal time interval of 0.0357 ms (or 4 symbols).
  • the radio parameters with index #1 are an example corresponding to an SCS of 120 kHz and a reference signal time interval of 0.1071 ms (or 12 symbols).
  • the radio parameters with index #2 are an example corresponding to an SCS of 240 kHz and a reference signal time interval of 0.0357 ms (or 8 symbols).
  • the network may be switched to enable or disable the above functions A) and/or B).
  • the notification from the network to the terminal 20 may be a notification by DCI (Downlink Control Information), may be a notification by MAC-CE (Medium Access Control - Control Element), or may be a notification by RRC (Radio Resource Control) signaling may be used.
  • DCI Downlink Control Information
  • MAC-CE Medium Access Control - Control Element
  • RRC Radio Resource Control
  • a UE capability may be defined that indicates whether or not the functions A) and/or B) above are supported.
  • the reference signal used for Doppler estimation may be, for example, TRS, DMRS (Demodulation reference signal), or other reference signals. Also, the time interval of the reference signal used for Doppler estimation may be changed based on other reported results such as RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality).
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the terminal 20 notifies the network of information related to the reference signal used for Doppler estimation, and changes the radio parameter to match the reference signal required for Doppler estimation, thereby adjusting the speed of movement. Accurate Doppler estimation can be performed with reduced reference signal overhead.
  • the base stations 10 and terminals 20 contain the functionality to implement the embodiments described above. However, each of the base station 10 and terminal 20 may have only part of the functions in the embodiment.
  • FIG. 9 is a diagram showing an example of the functional configuration of base station 10 according to the embodiment of the present invention.
  • the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140.
  • the functional configuration shown in FIG. 9 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal.
  • the transmitter 110 also transmits inter-network-node messages to other network nodes.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Also, the transmitting unit 110 has a function of transmitting reference signals such as NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, and TRS to the terminal 20 .
  • the receiving unit 120 also receives inter-network node messages from other network nodes.
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 .
  • the content of the setting information is, for example, setting information related to the reference signal of the terminal 20 and the like.
  • the control unit 140 performs signaling related to allocation of reference signals to the terminal 20, as described in the embodiment.
  • a functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110
  • a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 .
  • FIG. 10 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention.
  • the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240.
  • the functional configuration shown in FIG. 10 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary.
  • the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. Also, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals and the like transmitted from the base station 10 .
  • the transmission unit 210 as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) etc.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 .
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, setting information related to the reference signal.
  • the control unit 240 performs Doppler estimation based on reference signals received based on signaling from the base station 10, as described in the embodiment. Also, the control unit 240 performs a UE capability report indicating supported reference signals.
  • a functional unit related to signal transmission in control unit 240 may be included in transmitting unit 210 , and a functional unit related to signal reception in control unit 240 may be included in receiving unit 220 .
  • each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
  • a functional block may be implemented by combining software in the one device or the plurality of devices.
  • Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
  • a functional block (component) that performs transmission is called a transmitting unit or transmitter.
  • the implementation method is not particularly limited.
  • the base station 10, the terminal 20, etc. may function as a computer that performs processing of the wireless communication method of the present disclosure.
  • FIG. 11 is a diagram illustrating an example of hardware configurations 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, and the like. good too.
  • the term "apparatus” can be read as a circuit, device, unit, or the like.
  • the hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
  • Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .
  • the processor 1001 for example, operates an operating system and controls 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 device, registers, and the like.
  • CPU central processing unit
  • the control unit 140 , the control unit 240 and the like described above 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 according to them.
  • programs program codes
  • software modules software modules
  • data etc.
  • the program a program that causes a computer to execute at least part of the operations described in the above embodiments is used.
  • control unit 140 of base station 10 shown in FIG. 9 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 .
  • FIG. Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from a network via an electric communication line.
  • the storage device 1002 is a computer-readable recording medium, for example, 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 also be called a register, cache, main memory (main storage device), or the like.
  • the storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, for example, 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), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
  • the storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .
  • the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • the transceiver may be physically or logically separate implementations for the transmitter and receiver.
  • the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
  • the output device 1006 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
  • the base station 10 and the terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware.
  • processor 1001 may be implemented using at least one of these pieces of hardware.
  • a transmitting unit that transmits information related to the interval in the time domain of a reference signal to a base station, and a transmission unit related to the reference signal changed based on the information.
  • a terminal includes a receiver that receives radio parameters from the base station, and a controller that receives the reference signal from the base station and performs Doppler estimation based on the radio parameters.
  • the terminal 20 notifies the network of information related to the reference signal used for Doppler estimation, and changes the radio parameters to match the reference signal required for Doppler estimation, thereby increasing the accuracy according to the moving speed.
  • High Doppler estimation can be performed with reduced reference signal overhead. That is, it is possible to provide a reference signal suitable for Doppler estimation in a radio communication system.
  • the information may be information indicating whether Doppler estimation is possible at intervals in the time domain of the currently received reference signal.
  • the terminal 20 notifies the network of information related to the reference signal used for Doppler estimation, and changes the radio parameter to match the reference signal required for Doppler estimation, thereby increasing the accuracy according to the moving speed. High Doppler estimation can be performed with reduced reference signal overhead.
  • the information may be information indicating whether to change the interval in the time domain of the reference signal.
  • the terminal 20 notifies the network of information related to the reference signal used for Doppler estimation, and changes the radio parameter to match the reference signal required for Doppler estimation, thereby increasing the accuracy according to the moving speed. High Doppler estimation can be performed with reduced reference signal overhead.
  • the information may be information indicating an amount to change the interval in the time domain of the reference signal.
  • the radio parameter may be at least one of a subcarrier interval of the reference signal and a symbol interval of the reference signal.
  • a transmission procedure for transmitting information related to intervals in the time domain of reference signals to a base station, and transmission of radio parameters related to the reference signals changed based on the information to the base station.
  • a communication method is provided in which a terminal performs a reception procedure for receiving from a station and a control procedure for receiving said reference signal from said base station and performing Doppler estimation based on said radio parameter.
  • the terminal 20 notifies the network of information related to the reference signal used for Doppler estimation, and changes the radio parameters to match the reference signal required for Doppler estimation, thereby increasing the accuracy according to the moving speed.
  • High Doppler estimation can be performed with reduced reference signal overhead. That is, it is possible to provide a reference signal suitable for Doppler estimation in a radio communication system.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof.
  • the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.
  • notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
  • notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • Each aspect/embodiment described in the present disclosure includes 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), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).
  • a specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases.
  • various operations performed for communication with terminal 20 may be performed by base station 10 and other network nodes other than base station 10 (eg, but not limited to MME or S-GW).
  • base station 10 e.g, but not limited to MME or S-GW
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
  • Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.
  • the determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean value (Boolean: true or false), or may be performed by comparing numerical values (e.g. , comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
  • the channel and/or symbols may be signaling.
  • a signal may also be a message.
  • a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
  • radio resources may be indexed.
  • base station BS
  • radio base station base station
  • base station device fixed station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • a base station can accommodate one or more (eg, three) cells.
  • the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH:
  • RRH indoor small base station
  • the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage.
  • MS Mobile Station
  • UE User Equipment
  • a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
  • the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
  • at least one of 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 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 read as a user terminal.
  • communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.)
  • the terminal 20 may have the functions of the base station 10 described above.
  • 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 read as side channels.
  • user terminals in the present disclosure may be read as base stations.
  • the base station may have the functions that the above-described user terminal has.
  • determining and “determining” used in this disclosure may encompass a wide variety of actions.
  • “Judgement” and “determination” are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as “judged” or “determined”, and the like.
  • "judgment” and “determination” are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment” or “decision” has been made.
  • judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
  • judgment and “decision” may include considering that some action is “judgment” and “decision”.
  • judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
  • connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
  • two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.
  • RS Reference Signal
  • any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.
  • a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.
  • a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • SCS subcarrier spacing
  • TTI transmission time interval
  • transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.
  • a slot may consist of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
  • a slot may be a unit of time based on numerology.
  • a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist 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.
  • Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
  • one subframe may be called a Transmission Time Interval (TTI)
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • one slot or one minislot may be called a TTI.
  • TTI Transmission Time Interval
  • at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum scheduling time unit in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis.
  • radio resources frequency bandwidth, transmission power, etc. that can be used by each terminal 20
  • TTI is not limited to this.
  • a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
  • one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
  • a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
  • the short TTI e.g., shortened TTI, etc.
  • a TTI having the above TTI length may be read instead.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
  • the number of subcarriers included in the 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 numerology.
  • the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
  • One TTI, one subframe, etc. may each consist of one or more resource blocks.
  • One or more RBs are 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 composed of one or more resource elements (RE: Resource Element).
  • RE Resource Element
  • 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • a bandwidth part (which may also be called a bandwidth part) may represent a subset of contiguous common resource blocks (RBs) for a certain numerology on a certain carrier.
  • the common RB may be identified by an RB index based on the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or multiple BWPs may be configured for a UE within one carrier.
  • At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
  • BWP bitmap
  • radio frames, subframes, slots, minislots and symbols described above are only examples.
  • the number of subframes contained in a radio frame the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.
  • CP cyclic prefix
  • a and B are different may mean “A and B are different from each other.”
  • the term may also mean that "A and B are different from C”.
  • Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
  • notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
  • base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

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

Abstract

Ce terminal comprend : une unité de transmission pour transmettre, à une station de base, des informations concernant l'intervalle dans le domaine temporel d'un signal de référence ; une unité de réception pour recevoir, en provenance de la station de base, un paramètre sans fil concernant le signal de référence, qui est modifié sur la base des informations ; et une unité de commande pour recevoir le signal de référence en provenance de la station de base sur la base du paramètre sans fil et pour exécuter une estimation Doppler.
PCT/JP2021/016777 2021-04-27 2021-04-27 Terminal et procédé de communication WO2022230047A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068072A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Système de communications
US20200205116A1 (en) * 2017-08-08 2020-06-25 Apple Inc. System and method for multiplexing of tracking reference signal and synchronization signal block

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016068072A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Système de communications
US20200205116A1 (en) * 2017-08-08 2020-06-25 Apple Inc. System and method for multiplexing of tracking reference signal and synchronization signal block

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