WO2017038674A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017038674A1 WO2017038674A1 PCT/JP2016/074955 JP2016074955W WO2017038674A1 WO 2017038674 A1 WO2017038674 A1 WO 2017038674A1 JP 2016074955 W JP2016074955 W JP 2016074955W WO 2017038674 A1 WO2017038674 A1 WO 2017038674A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/18—Automatic changing of the traffic direction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/22—Arrangements affording multiple use of the transmission path using time-division multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- Non-Patent Document 1 LTE-Advanced
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- a new wireless access method (5G New RAT) will be introduced in place of the existing LTE system wireless access method (LTE: Radio Access Technology). It is also assumed.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- DL and UL are transmitted in time division duplex (TDD) in which time division multiplexing of DL and UL is performed on the same frequency (carrier). It is desirable to be able to switch dynamically at every interval (TTI: Transmission Time Interval).
- the present invention has been made in view of such points, and in a wireless communication system capable of switching between DL and UL for each TTI in TDD, a user terminal, a wireless base station, and Another object is to provide a wireless communication method.
- One aspect of the user terminal of the present invention is a user terminal used in a radio communication system capable of switching between a downlink (DL) and an uplink (UL) at every transmission time interval (TTI), and is a TTI for DL.
- a receiving unit that receives a DL signal using a UL and a transmitting unit that transmits a UL signal using a TTI for UL, and different TTI lengths are applied to the DL TTI and the UL TTI.
- the present invention it is possible to further reduce delay in a wireless communication system capable of switching between DL and UL for each TTI in TDD.
- 1A and 1B are diagrams illustrating an example of a form of introduction of a future wireless communication system.
- 2A and 2B are diagrams illustrating an example of a 5G New RAT.
- TTI length for UL which concerns on a 1st aspect
- TTI length for DL TTI length for DL.
- 4A, 4B, and 4C are diagrams illustrating another example of the UL TTI length and the DL TTI length according to the first aspect.
- FIG. 1 is a diagram showing an example of a form of introduction of a future wireless communication system. As shown in FIG. 1A, it is assumed that future wireless communication systems such as 5G will be introduced so as to be superimposed (overlaid) on the existing LTE system.
- future wireless communication systems such as 5G will be introduced so as to be superimposed (overlaid) on the existing LTE system.
- a number of cells (5G New RAT) of a radio access system (5G New RAT) of a future radio communication system are included in a cell (LTE cell) of a radio access system (LTE RAT) of an existing LTE system.
- the LTE cell may be a macro cell having a relatively large coverage
- the 5G cell may be a small cell having a smaller coverage than the LTE cell.
- a 5G New RAT cell (for example, a small cell) uses a higher frequency band than an LTE RAT cell (for example, a macro cell).
- FIG. 2 is a diagram illustrating an example of a 5G New RAT.
- frequency parameters for example, subcarrier spacing and bandwidth
- time parameters for example, symbol length
- the frequency parameter for example, subcarrier interval and bandwidth
- the time parameter for example, symbol length
- 5G New RAT In the 5G New RAT as described above, it is required to flexibly cope with fluctuations in traffic between DL and UL to improve utilization efficiency of radio resources and to reduce delay. For this reason, in 5G New RAT, it is desired that DL and UL can be dynamically switched for each TTI in TDD.
- the present inventors have conceived that overhead is reduced and further delay is realized by applying different TTI lengths for the UL TTI and the DL TTI, resulting in the present invention. It was.
- a user terminal receives a DL signal with a DL TTI and transmits a UL signal with a UL TTI. Also, different TTI lengths are applied to the DL TTI and the UL TTI.
- the TTI length of the UL TTI is made shorter than the TTI length of the DL TTI, but the present invention is not limited thereto.
- the TTI length of the UL TTI and the DL TTI need only be different, and the TTI length of the DL TTI does not prevent the TTI length of the UL TTI from being shortened.
- FIG. 3 is a diagram illustrating an example of a TTI length for UL and a TTI length for DL according to the first aspect. As shown in FIG. 3, different TTI lengths are applied to the DL TTI and the UL TTI. Specifically, the UL TTI length may be shorter than the DL TTI length.
- the UL TTI may include a gap interval used for timing advance and / or transmission / reception switching and a symbol interval to which a UL signal is allocated.
- the UL TTI length may be 1 / N times the NDL TTI length (N is a positive integer).
- N is a positive integer.
- FIG. 4 is a diagram illustrating another example of the UL TTI length and the DL TTI length according to the first aspect.
- the UL TTI length and the DL TTI length include at least one symbol to which a preamble is assigned (preamble symbol) and at least one symbol to which a data channel or / and a control channel is assigned (ordinary symbol).
- preamble symbol at least one symbol to which a preamble is assigned
- data channel or / and a control channel ordinary symbol
- the basic configuration includes one preamble symbol and a plurality of normal symbols.
- the preamble symbol may be different from the normal symbol in at least one of the subcarrier interval, the symbol length, and the CP length.
- the symbol length of the preamble is shorter than the symbol length of the normal symbol.
- the preamble symbol may be arranged at the head symbol.
- one TTI may be configured with only the basic configuration (that is, the basic configuration is repeated once).
- 1 TTI may be configured by repeating the basic configuration twice.
- 1 TTI may be configured by repeating the basic configuration three times.
- 1 TTI is configured by N times the basic configuration (N is a positive integer).
- the TTI length for DL and UL are changed by changing the number of repetitions of the basic configuration between TTI for DL and TTI for UL.
- the TTI length may be different.
- the basic configuration can be repeated once (FIG. 4A)
- the basic configuration can be repeated three times (FIG. 4C).
- the UL TTI length can be reduced to 1/3 times the DL TTI length.
- the UL TTI length is simply 1 / N times the DL TTI length (N Can be a positive integer).
- the user terminal may receive information on the ratio (N) between the UL TTI length and the DL TTI length from the radio base station (network).
- the information regarding the ratio may be notified from the radio base station to the user terminal by upper layer signaling (for example, RRC (Radio Resource Control) signaling) or broadcast information, for example.
- the user terminal controls transmission of the UL signal in the UL TTI and reception of the DL signal in the DL TTI based on the ratio between the UL TTI length and the DL TTI length.
- the basic configuration shown in FIG. 4A is merely an example, and is not limited thereto.
- the preamble symbol is included in the basic configuration, but the preamble symbol may not be included.
- the symbol length of the preamble symbol may be the same as the symbol length of the normal symbol.
- the TTI length for DL and / or UL may be changed to dynamic.
- the DL and / or UL TTI length shown in FIG. 3 is specified by downlink control information (DCI: Downlink Control Information) (for example, DL assignment or UL grant) transmitted on the control channel. May be.
- DCI Downlink Control Information
- information indicating the number of repetitions of the basic configuration may be included in the DCI. Good.
- the gap section included in the UL TTI may be realized by replacing some symbols included in the basic configuration. For example, when the TTI length as shown in FIG. 4A, FIG. 4B, or FIG. 4C is used for the UL, a length corresponding to a part of symbols is arranged at the head as a gap section, and a preamble symbol included in the UL transmission signal correspondingly. Or you may reduce the number of normal symbols.
- different TTI lengths can be applied to the UL TTI and the DL TTI, so that the TTI length corresponding to the UL / DL traffic can be applied.
- overhead due to unused resources in the TTI can be reduced, and further delay reduction can be realized.
- FIG. 5 is a diagram illustrating an example of a TTI determination (recognition) operation in the user terminal according to the second mode.
- the TTI length of the UL TTI including the gap section is T
- the DL TTI length is NT.
- the DL TTI is configured by repeating the above basic configuration twice, but is not limited thereto.
- the DL TTI may be configured without being based on the basic configuration as long as the TTI has a different length from the UL TTI.
- the user terminal controls the determination timing as to whether or not it is a DL TTI based on the TTI length of each TTI. For example, when it is determined that the TTI starting from the timing t1 in FIG. 5 is a DL TTI by detecting the preamble, the user terminal performs the next TTI after the NT period (DL TTI length) from the timing t1. Is a TTI for DL.
- the user terminal when it is determined that the TTI started from the timing t2 in FIG. 5 is the UL TTI due to the undetected preamble, the user terminal performs the following after the T period (the TTI length for UL) from the timing t2. It is determined whether or not the TTI is a DL TTI.
- the TTI starting from the timing t3 in FIG. 5 is also determined to be a TTI for DL, so that the next TTI is DL after the NT period from the timing t3. It is determined whether or not the TTI is for use.
- the user terminal determines whether the TTI is the DL TTI or the UL TTI. Can be determined appropriately.
- a feedback signal symbol (feedback symbol) included in the DL TTI will be described.
- the third aspect can be used in combination with the first and / or second aspects.
- the DL TTI includes a feedback symbol for transmitting a feedback signal for the DL signal.
- the feedback signal is, for example, a signal including acknowledgment information (HARQ-ACK: Hybrid Automatic Repeat reQuest-ACKnowledgement) for the DL signal.
- HARQ-ACK Hybrid Automatic Repeat reQuest-ACKnowledgement
- FIG. 6 is a diagram illustrating an example of a TTI for DL according to the third aspect.
- the DL TTI is configured by repeating the above basic configuration twice, but the present invention is not limited to this.
- the DL TTI may be configured without being based on the basic configuration as long as the TTI has a different length from the UL TTI.
- the DL TTI includes a preamble symbol, a symbol (control symbol) to which a control channel (DL control signal) is assigned, and a symbol (data symbol) to which a data channel (DL data signal) is assigned. , Including feedback symbols.
- a gap interval is provided between the data symbol and the feedback symbol, and switching between DL and UL is performed.
- the feedback symbol may be different from the data symbol and / or control symbol in at least one of the symbol length, subcarrier interval, and cyclic prefix (CP) length.
- CP cyclic prefix
- the feedback symbol may be arranged in the final symbol of the TTI. This facilitates transmission of feedback signals for data channels (DL data signals) received within the same TTI using feedback symbols.
- FIG. 7 is a diagram illustrating an example of a feedback operation using the DL TTI according to the third aspect.
- the preamble symbol is not shown, but as described in FIG. 6, each TTI may include a preamble symbol.
- data symbols are not shown, but the data channel may be arranged in a plurality of symbols as shown in FIG.
- the data channel (DL data signal) in TTI # 1 is allocated to user terminals # 1, # 2, and # 3 by the DL TTI # 1 downlink control channel (DL control signal). It is done.
- User terminal # 1 transmits a feedback signal for the data channel in TTI # 1 using the same feedback symbol in TTI # 1.
- the user terminal # 2 transmits a feedback signal for the data channel in the TTI # 1 using the feedback symbol in the next TTI # 2.
- user terminal # 3 transmits a feedback signal for the data channel in TTI # 1 using a feedback symbol in TTI # 3.
- the user terminal transmits the feedback signal for the DL signal received by the DL TTI, the symbol for the DL TTI feedback, or the feedback of the TTI for the subsequent DLs. Send with the symbol for.
- the user terminal may receive downlink control information (DCI) (for example, DL assignment) indicating both the data channel allocation resource and the feedback signal allocation resource for the data channel via the control channel. Good.
- DCI downlink control information
- the user terminal may determine a feedback symbol based on the DCI and transmit a feedback signal using the determined feedback symbol.
- the radio base station may determine a feedback signal allocation resource based on interval information from the user terminal.
- the radio base station can allocate a feedback symbol in the same TTI as that of the data channel to a high-performance user terminal (for example, UE # 1 in FIG. 7).
- the radio base station can allocate feedback symbols of TTIs subsequent to the TTI to which the data channel is allocated to low-performance user terminals (for example, UEs # 2 and # 3 in FIG. 7).
- the user terminal does not need to receive DCI indicating the data channel allocation resource via the downlink control channel and explicitly receive information indicating the feedback signal allocation resource for the data channel.
- the user terminal may determine the feedback signal allocation resource based on the capability information of the terminal itself or information notified by higher layer signaling.
- the user terminal can transmit a feedback signal for a data channel allocated in the DL TTI to the radio base station by using a feedback symbol in the same TTI in the shortest time. For this reason, it is not necessary to switch the DL TTI to the UL TTI in order to transmit a feedback signal to the data channel, and a further reduction in delay can be realized.
- the feedback symbol included in the DL TTI has been described.
- the present invention can also be applied to the UL TTI.
- the UL TTI may include a data symbol and a feedback symbol.
- the radio base station uses the UL TTI feedback symbol for the UL signal received by the UL TTI, or the user terminal as a UL TTI feedback symbol for the subsequent UL. Send to.
- wireless communication system Wireless communication system
- the configuration of a wireless communication system according to an embodiment of the present invention will be described.
- the above wireless communication method is applied.
- wireless communication method which concerns on each said aspect may be applied independently, and may be applied in combination.
- FIG. 8 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied.
- the wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), or the like.
- TDD is applied, and UL and DL can be switched for each TTI.
- the radio communication system 1 shown in FIG. 8 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. . Moreover, the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, six or more CCs).
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier-Frequency Division Multiple Access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the DL and UL radio access schemes are not limited to these combinations, and OFDMA may be used in the UL.
- NOMA non-orthogonal multiple access
- power multiple access also referred to as power multiple access
- a downlink data channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), an L1 / L2 control channel (L1 / L2 control signal) or the like is used.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- L1 / L2 control channel L1 / L2 control signal
- SIB System Information Block
- MIB Master Information Block
- L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. .
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH.
- EPDCCH is frequency-division multiplexed with PDSCH (downlink data channel), and is used for transmission of DCI and the like in the same way as PDCCH.
- an uplink data channel shared by each user terminal 20
- an uplink control channel PUCCH: Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted through the uplink data channel.
- Uplink control information including at least one of acknowledgment information (ACK / NACK) and radio quality information (CQI) is transmitted by an uplink data channel or an uplink control channel.
- a random access preamble for establishing connection with the cell is transmitted by the random access channel.
- FIG. 9 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that each of the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- the DL control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 may transmit information on the ratio (N) between the UL TTI length and the DL TTI length to the user terminal 20 by higher layer signaling or broadcast information. Further, the transmission / reception unit 103 transmits downlink control information (for example, DL assignment, UL grant) to the user terminal 20 through the downlink control channel.
- downlink control information for example, DL assignment, UL grant
- the transmitter / receiver, the transmission / reception circuit, or the transmission / reception device can be configured based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the UL signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.
- CPRI Common Public Radio Interface
- X2 interface also good.
- FIG. 10 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment.
- FIG. 10 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
- the control unit 301 controls the entire radio base station 10.
- the control unit 301 controls, for example, DL signal generation by the transmission signal generation unit 302, signal mapping by the mapping unit 303, and signal reception processing by the reception signal processing unit 304.
- control unit 301 controls switching between the DL TTI and the UL TTI.
- control unit 301 may switch between the DL TTI and the UL TTI for each TTI based on the DL and / or UL traffic volume.
- control unit 301 may perform control so that the TTI length is different between the DL TTI and the UL TTI (first mode). For example, the control unit 301 may control the UL TTI length to be 1 / N times (N is a positive integer) the DL TTI length. Further, the control unit 301 may change the TTI length between the DL TTI and the UL TTI by changing the number of repetitions of the basic configuration. In addition, the control unit 301 may control the transmission signal generation unit 302 so as to transmit information related to the ratio between the UL TTI length and the DL TTI length.
- control unit 301 may control to change the DL and / or UL TTI length to dynamic and transmit DCI including information indicating the changed TTI length.
- control unit 301 may control to transmit DCI including information indicating the number of repetitions of the basic configuration.
- control unit 301 may control the transmission signal generation unit 302 and the mapping unit 303 so as to include a preamble symbol to which a preamble is allocated in the DL TTI (second mode). In addition, the control unit 301 may perform control so that a plurality of preamble symbols are included in the DL TTI.
- control unit 301 maps the transmission signal generation unit 302 and the mapping so that at least one of the symbol length, the subcarrier interval, and the CP length is different from the symbol to which the downlink data channel and / or the downlink control channel is allocated.
- the unit 302 may be controlled.
- control unit 301 controls radio resource allocation (scheduling) for the downlink data channel and the uplink data channel.
- the control unit 301 performs control so that DCI instructing UL transmission or DL reception in the assigned radio resource is transmitted using the downlink control channel.
- control unit 301 performs control so that DCI (for example, DL assignment) indicating both the downlink data channel allocation resource and the feedback signal allocation resource for the downlink data channel is transmitted via the downlink control channel. It may be possible (third aspect). Moreover, the control part 301 may determine the allocation resource of a feedback signal based on the capability information (for example, above-mentioned space
- DCI for example, DL assignment
- interval information for example, above-mentioned space
- control unit 301 may control retransmission of the DL signal based on information (for example, delivery confirmation information) fed back with a DL TTI feedback symbol (third mode).
- the control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates a DL signal (including a downlink data channel, a downlink control channel (L1 control signal), and a downlink reference signal) based on an instruction from the control unit 301, and outputs the DL signal to the mapping unit 303. .
- the transmission signal generation unit 302 generates a preamble that is mapped to the preamble symbol based on an instruction from the control unit 301, and outputs the preamble to the mapping unit 303.
- the preamble is a sequence known by the radio base station 10 and the user terminal 20, and may be cell specific, transmission point specific, or beam pattern specific.
- the transmission signal generation unit 302 may generate a preamble based on any of cell ID, virtual cell ID, or beam pattern identification information.
- Information for example, cell ID, virtual cell ID, or beam pattern identification information
- the preamble may be notified to the user terminal 20 by higher layer signaling.
- the transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs the DL signal to the transmission / reception unit 103.
- the mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 to a preamble symbol based on an instruction from the control unit 301, and outputs the DL symbol to the transmission / reception unit 103.
- the mapping unit 303 can be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the UL signal (including the uplink data channel, the uplink control channel, and the uplink reference signal) transmitted from the user terminal 20. .
- the processing result is output to the control unit 301.
- the reception signal processing unit 304 may be configured by a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device, which are described based on common recognition in the technical field according to the present invention. it can.
- the measurement unit 305 performs measurement using the uplink reference signal from the user terminal 20 and outputs the measurement result to the control unit 301.
- the measurement unit 305 can be configured by a signal processor, a signal processing circuit or a signal processing device, and a measurement device, a measurement circuit or a measurement device which are described based on common recognition in the technical field according to the present invention.
- FIG. 11 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202.
- Each transmitting / receiving unit 203 receives the DL signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
- the data is transferred to the transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 may receive information on the ratio (N) between the UL TTI length and the DL TTI length from the radio base station 10 by higher layer signaling or broadcast information.
- the transmission / reception unit 203 receives downlink control information (for example, DL assignment, UL grant) from the radio base station 10 through the downlink control channel.
- the transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. Further, the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- FIG. 12 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment.
- FIG. 12 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. I have.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402, signal mapping by the mapping unit 403, and signal reception processing by the reception signal processing unit 404.
- control unit 401 controls the reception of the DL signal in the DL TTI and the transmission of the UL signal in the UL TTI.
- the control unit 401 applies different TTI lengths for the DL TTI and the UL TTI (first mode).
- the control unit 401 controls the UL TTI length to be 1 / N (N is a positive integer) of the DL TTI length.
- the control unit 401 receives the DL signal in the DL TTI and the UL signal in the UL TTI based on the information about the ratio of the DL TTI length to the UL TTI length (for example, N described above). Transmission may be controlled. Information regarding the ratio may be notified from the radio base station 10 to the user terminal 20.
- control unit 401 may perform control so as to change the DL and / or UL TTI length to dynamic. Specifically, the control unit 401 may control the reception of the DL signal in the DL TTI and the transmission of the UL signal in the UL TTI based on the TTI indicated by the DCI. Further, when the DL and / or UL TTI is configured by repetition of the basic configuration, the control unit 401 receives the DL signal in the DL TTI and uses the UL based on the number of repetitions specified by the DCI. The transmission of the UL signal in the TTI may be controlled.
- control unit 401 determines whether each TTI is a DL TTI based on the TTI signal configuration, and controls the reception of the DL signal. In addition, the control unit 401 may determine whether or not the TTI is for DL depending on whether or not the preamble is detected in each TTI.
- the control unit 401 may determine that the TTI is a DL TTI. In this case, the control unit 401 uses the reference signal included in the DL TTI to control to perform at least one of time-frequency synchronization, AGC (Automatic Gain Control), channel estimation, and control channel demodulation. Also good.
- AGC Automatic Gain Control
- the control unit 401 may determine that the TTI is a UL TTI. In this case, the control unit 401 may perform control so as not to perform the above-described processing that is performed when it is determined that the TTI is for DL.
- control unit 401 may control the determination timing as to whether or not it is a TTI for DL based on the TTI length of each TTI (second mode).
- control unit 401 transmits a feedback signal for the DL signal received by the DL TTI using the DL TTI feedback symbol or the DL DL TTI feedback symbol after the DL TTI. (Third aspect).
- control unit 401 is based on downlink control information indicating both the DL signal allocation resource and the feedback signal allocation resource, or the downlink control information indicating the DL signal allocation resource and the capability information of the user terminal 20 or A feedback symbol may be determined based on information notified by higher layer signaling, and a feedback signal may be transmitted using the feedback symbol (third mode).
- the control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates a UL signal (including an uplink data channel, an uplink control channel, and an uplink reference signal) based on an instruction from the control unit 401 and outputs the UL signal to the mapping unit 403. For example, the transmission signal generation unit 402 generates an uplink control channel including UCI. Also, the transmission signal generation unit 402 generates an uplink data channel including uplink user data.
- the transmission signal generation unit 402 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 403 Based on an instruction from the control unit 401, the mapping unit 403 maps the UL signal (uplink control channel, uplink data channel, uplink reference signal, etc.) generated by the transmission signal generation unit 402 to a radio resource, and transmits and receives It outputs to 203.
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the DL signal (including the downlink control channel (L1 control signal) and the downlink data channel).
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401.
- the received signal processing unit 404 outputs, for example, broadcast information, system information, control information by higher layer signaling such as RRC signaling, DCI, and the like to the control unit 401.
- the received signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the measurement unit 405 measures (estimates) the channel state based on the downlink reference signal (for example, CRS, CSI-RS) from the radio base station 10 and outputs the measurement result to the control unit 401. Moreover, the measurement part 405 may estimate a channel state based on the preamble allocated to the preamble symbol in TTI.
- the downlink reference signal for example, CRS, CSI-RS
- the measuring unit 405 can be composed of a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device which are explained based on common recognition in the technical field according to the present invention.
- each functional block is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- the radio base station 10 and the user terminal 20 are realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array). May be.
- the radio base station 10 and the user terminal 20 are each a computer device including a processor (CPU: Central Processing Unit), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. It may be realized. That is, the radio base station, user terminal, and the like according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method according to the present invention.
- Computer-readable recording media include, for example, flexible disks, magneto-optical disks, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), CD-ROM (Compact Disc-ROM), RAM (Random Access Memory), A storage medium such as a hard disk.
- the program may be transmitted from a network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.
- the program may be a program that causes a computer to execute the operations described in the above embodiments.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.
- software, instructions, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- DSL digital subscriber line
- wireless technology such as infrared, wireless and microwave.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be called a carrier frequency, a cell, or the like.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by an index.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, 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.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- CDMA2000 Code Division Multiple Access 2000
- UMB User Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra-WideBand)
- Bluetooth registered trademark
Abstract
Description
第1の態様では、互いに異なるUL用のTTI長とDL用のTTI長について説明する。
第2の態様では、UL用のTTIとDL用のTTIとで異なるTTI長が適用される場合に、ユーザ端末がDL用のTTIであるか否かを判断する動作について説明する。第2の態様は、第1の態様と組み合わせて用いることが可能である。
第3の態様では、DL用のTTIに含まれるフィードバック信号用のシンボル(フィードバックシンボル)について説明する。第3の態様は、第1及び/又は第2の態様と組み合わせて用いることが可能である。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記無線通信方法が適用される。なお、上記各態様に係る無線通信方法は、単独で適用されてもよいし、組み合わせて適用されてもよい。
図9は、本発明の一実施形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106とを備えている。なお、送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されてもよい。
図11は、本発明の一実施形態に係るに係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、MIMO伝送のための複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。
Claims (10)
- 下りリンク(DL)と上りリンク(UL)とを伝送時間間隔(TTI)毎に切り替え可能な無線通信システムで用いられるユーザ端末であって、
DL用のTTIでDL信号を受信する受信部と、
UL用のTTIでUL信号を送信する送信部と、を有し、
前記DL用のTTIと前記UL用のTTIとで異なるTTI長が適用されることを特徴とするユーザ端末。 - 前記UL用のTTI長は、前記DL用のTTI長の1/N(Nは、正の整数)であることを特徴とする請求項1に記載のユーザ端末。
- 前記UL用のTTI及び前記DL用のTTIは、プリアンブルが割り当てられる少なくとも一つのシンボルとデータチャネル又は/及び制御チャネルが割り当てられる少なくとも一つのシンボルとを含んで構成される基本構成に基づいて構成され、
前記基本構成の繰り返し回数の変更により、前記DL用のTTIと前記UL用のTTIとで異なるTTI長が適用されることを特徴とする請求項1又は請求項2に記載のユーザ端末。 - 前記受信部は、前記UL用のTTI長と前記DL用のTTI長との比に関する情報を受信することを特徴とする請求項1から請求項3のいずれかに記載のユーザ端末。
- 前記UL用のTTIは、タイミングアドバンス及び/又は送受信切り替えに用いられるギャップ区間を含むことを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。
- 前記DL用のTTIは、DL信号に対するフィードバック信号を送信するためのフィードバック用のシンボルを含み、
前記送信部は、前記DL用のTTIで受信したDL信号に対するフィードバック信号を、該DL用のTTIのフィードバック用のシンボル、又は、次以降のDL用のTTIのフィードバック用のシンボルで送信することを特徴とする請求項1から請求項5のいずれかに記載のユーザ端末。 - 前記送信部は、前記DL信号の割り当てリソースと前記フィードバック信号の割り当てリソースとの双方を示す下り制御情報に基づいて決定されるシンボルで、或いは、前記DL信号の割り当てリソースを示す下り制御情報と前記ユーザ端末の能力情報又は上位レイヤシグナリングで通知される情報に基づいて決定されるシンボルで、前記フィードバック信号を送信することを特徴とする請求項6に記載のユーザ端末。
- 前記フィードバック信号用のシンボルは、前記DL信号が割当てられるシンボルとサブキャリア間隔、シンボル長及びCP長の少なくとも一つが異なることを特徴とする請求項6又は請求項7に記載のユーザ端末。
- 下りリンク(DL)と上りリンク(UL)とを伝送時間間隔(TTI)毎に切り替え可能な無線通信システムで用いられる無線基地局であって、
DL用のTTIでDL信号を送信する送信部と、
UL用のTTIでUL信号を受信する受信部と、を有し、
前記DL用のTTIと前記UL用のTTIとで異なるTTI長が適用されることを特徴とする無線基地局。 - 下りリンク(DL)と上りリンク(UL)とを伝送時間間隔(TTI)毎に切り替え可能な無線通信システムにおける無線通信方法であって、
ユーザ端末において、
DL用のTTIでDL信号を送信する工程と、
UL用のTTIでUL信号を受信する工程と、を有し、
前記DL用のTTIと前記UL用のTTIとで異なるTTI長が適用されることを特徴とする無線通信方法。
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US20180331816A1 (en) | 2018-11-15 |
CN107950066A (zh) | 2018-04-20 |
CN107950066B (zh) | 2022-06-14 |
US20200177359A1 (en) | 2020-06-04 |
JP2020182253A (ja) | 2020-11-05 |
JPWO2017038674A1 (ja) | 2018-07-19 |
JP7054405B2 (ja) | 2022-04-13 |
US11133918B2 (en) | 2021-09-28 |
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