WO2017130993A1 - 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J13/18—Allocation of orthogonal codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
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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
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J2013/165—Joint allocation of code together with frequency or time
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0012—Hopping in multicarrier systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
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
- LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
- LTE Long Term Evolution
- Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel. 14, etc.
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC Dual Connectivity
- CG Cell Group
- CC Cell Center
- frequency division duplex in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and DL transmission and UL transmission are in the same frequency band.
- Time Division Duplex which is performed by switching over time, is introduced.
- a transmission time interval (TTI) applied to DL transmission and UL transmission between the radio base station and the user terminal is set to 1 ms and controlled.
- the TTI in the LTE system (for example, LTE Rel. 8-13) is also called a subframe, a subframe length, or the like.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- Rel In future wireless communication systems such as LTE and 5G after 13th, communication in high frequency bands such as tens of GHz, relative to IoT (Internet of Things), MTC: Machine Type Communication, M2M (Machine To Machine), etc. It is assumed that communication with a small amount of data is performed. In such a future wireless communication system, when a communication method (for example, 1 ms transmission time interval (TTI)) in an existing LTE system (for example, LTE Rel. 8-12) is applied, sufficient communication service is provided. It may not be possible.
- TTI transmission time interval
- a shortened TTI a TTI shorter than a 1 ms TTI (hereinafter referred to as a normal TTI).
- PUCCH Physical Uplink Control Channel
- the present invention has been made in view of such points, and an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of performing communication using an uplink control channel having a configuration suitable for shortened TTI.
- an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of performing communication using an uplink control channel having a configuration suitable for shortened TTI.
- One aspect of the user terminal is a transmitter that transmits uplink control information via an uplink control channel in a second TTI configured with a smaller number of symbols than a first transmission time interval (TTI), and the uplink control.
- a control unit that controls transmission of information, wherein the control unit transmits the uplink control information in a resource block that performs frequency hopping between slots in the second TTI, and at least one symbol constituting the slot.
- the reference signal for demodulation is mapped to the above.
- communication can be performed using an uplink control channel having a configuration suitable for shortened TTI.
- 2A and 2B are diagrams illustrating a configuration example of a shortened TTI.
- 3A to 3C are diagrams illustrating setting examples of the shortened TTI.
- 4A to 4D are diagrams illustrating an example of a normal TTI PF.
- 5A-5C are diagrams illustrating an application example of the shortened TTI of PF1 / 1a / 1b.
- 6A to 6C are diagrams illustrating application examples of the shortened TTI of PF2 / 2a / 2b.
- 7A and 7B are diagrams illustrating a first configuration example of the new PF according to the first aspect.
- 8A and 8B are diagrams illustrating a second configuration example of the new PF according to the first aspect.
- 9A and 9B are diagrams illustrating a third configuration example of the new PF according to the first aspect.
- 10A and 10B are diagrams illustrating a diffusion example in the new PF according to the first aspect.
- 11A and 11B are diagrams illustrating an example of a PRB index according to the first aspect.
- 12A and 12B are diagrams illustrating a first configuration example based on PF1 / 1a / 1b / 3 according to the second mode.
- 13A and 13B are diagrams illustrating a second configuration example based on PF1 / 1a / 1b / 3 according to the second mode.
- FIGS. 14A and 14B are diagrams illustrating a setting example of the shortened TTI in the second configuration example based on PF1 / 1a / 1b / 3.
- 15A and 15B are diagrams illustrating another setting example of the shortened TTI in the second configuration example based on PF1 / 1a / 1b / 3.
- FIGS. 16A to 16C are diagrams illustrating a configuration example based on PF2 / 2a / 2b / 4/5 according to the second mode.
- FIGS. 17A to 17C are diagrams illustrating setting examples of the shortened TTI in the configuration example based on PF2 / 2a / 2b / 4/5.
- 18A to 18C are diagrams illustrating another setting example of the shortened TTI in the configuration example based on PF2 / 2a / 2b / 4/5. It is a figure which shows an example of schematic structure of the radio
- FIG. 1 is a diagram illustrating an example of a TTI (normal TTI) in an LTE system (for example, LTE Rel. 8-12).
- the normal TTI has a time length of 1 ms.
- the normal TTI is also called a subframe, and is composed of two time slots (hereinafter also referred to as normal slots in the sense of being distinguished from slots in the shortened TTI).
- the normal TTI is a transmission time unit of one channel-coded data packet, and is a processing unit such as scheduling and link adaptation.
- the normal TTI is configured to include 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols (7 OFDM symbols per normal slot).
- Each OFDM symbol has a time length (symbol length) of 66.7 ⁇ s, and a normal CP of 4.76 ⁇ s is added. Since the symbol length and the subcarrier interval are inverse to each other, when the symbol length is 66.7 ⁇ s, the subcarrier interval is 15 kHz.
- the normal TTI is configured to include 14 SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols (normally 7 SC-FDMA symbols per slot).
- SC-FDMA Single Carrier Frequency Division Multiple Access
- Each SC-FDMA symbol has a time length (symbol length) of 66.7 ⁇ s, and a normal CP of 4.76 ⁇ s is added. Since the symbol length and the subcarrier interval are inverse to each other, when the symbol length is 66.7 ⁇ s, the subcarrier interval is 15 kHz.
- the normal TTI may be configured to include 12 OFDM symbols (or 12SC-FDMA symbols).
- each OFDM symbol (or each SC-FDMA symbol) has a time length of 66.7 ⁇ s, and an extended CP of 16.67 ⁇ s is added.
- OFDM symbols may be used in the UL.
- symbols when the OFDM symbol and the SC-FDMA symbol are not distinguished, they are referred to as “symbols”.
- wireless interfaces suitable for high frequency bands such as tens of GHz, IoT (Internet of Things), MTC: Machine Type Communication, M2M (Machine To Machine), etc.
- IoT Internet of Things
- MTC Machine Type Communication
- M2M Machine To Machine
- a time margin for processing for example, encoding, decoding, etc.
- the number of user terminals that can be accommodated per unit time for example, 1 ms
- FIG. 2 is a diagram illustrating a configuration example of the shortened TTI.
- the shortened TTI has a time length (TTI length) shorter than 1 ms.
- the shortened TTI may be, for example, one or a plurality of TTI lengths with a multiple of 1 ms, such as 0.5 ms, 0.2 ms, and 0.1 ms.
- a normal TTI in the case of a normal CP, includes 14 symbols, so that it is one or a plurality of TTI lengths that are integer multiples of 1/14 ms, such as 7/14 ms, 4/14 ms, 3/14 ms, and 1/14 ms. May be.
- a normal TTI since a normal TTI includes 12 symbols, it is one or a plurality of TTI lengths that are integral multiples of 1/12 ms such as 6/12 ms, 4/12 ms, 3/12 ms, and 1/12 ms. May be.
- the normal CP or the extended CP can be configured by higher layer signaling such as broadcast information or RRC signaling. This makes it possible to introduce a shortened TTI while maintaining compatibility (synchronization) with a normal TTI of 1 ms.
- FIG. 2A is a diagram illustrating a first configuration example of the shortened TTI.
- the shortened TTI is composed of the same number of symbols as the normal TTI (here, 14 symbols), and each symbol has a symbol length of the normal TTI (for example, 66. A symbol length shorter than 7 ⁇ s).
- the normal TTI physical layer signal configuration (RE arrangement or the like) can be used.
- the same amount of information (bit amount) as that of normal TTI can be included in the shortened TTI.
- the symbol time length is different from that of the normal TTI symbol, it is difficult to frequency multiplex the shortened TTI signal and the normal TTI signal shown in FIG. 2A in the same system band (or cell, CC). It becomes.
- the subcarrier interval is usually wider than 15 kHz of TTI.
- the subcarrier interval becomes wide, it is possible to effectively prevent channel-to-channel interference due to Doppler shift during movement of the user terminal and transmission quality deterioration due to phase noise of the user terminal receiver.
- a high frequency band such as several tens of GHz, it is possible to effectively prevent deterioration in transmission quality by widening the subcarrier interval.
- FIG. 2B is a diagram illustrating a second configuration example of the shortened TTI.
- the shortened TTI is configured with a smaller number of symbols than the normal TTI, and each symbol has the same symbol length (for example, 66.7 ⁇ s) as the normal TTI.
- the shortened TTI is half the time length (0.5 ms) of the normal TTI, the shortened TTI is composed of half the normal TTI symbols (here, 7 symbols).
- the information amount (bit amount) included in the shortened TTI can be reduced as compared with the normal TTI.
- the user terminal can perform reception processing (for example, demodulation, decoding, etc.) of information included in the shortened TTI in a time shorter than normal TTI, and the processing delay can be shortened.
- the shortened TTI signal and the normal TTI signal shown in FIG. 2B can be frequency-multiplexed within the same system band (or cell, CC), and compatibility with the normal TTI can be maintained.
- FIGS. 2A and 2B show an example of a shortened TTI that assumes a case of a normal CP (a case where a normal TTI is composed of 14 symbols), but the configuration of the shortened TTI is shown in FIGS. 2A and 2B. It is not limited to things.
- the shortened TTI in FIG. 2A may be configured with 12 symbols
- the shortened TTI in FIG. 2B may be configured with 6 symbols.
- the shortened TTI only needs to have a shorter time length than the normal TTI, and the number of symbols, the symbol length, the CP length, and the like in the shortened TTI are arbitrary.
- a setting example of the shortened TTI will be described with reference to FIG.
- a future wireless communication system may be configured to be able to set both a normal TTI and a shortened TTI so as to be compatible with an existing LTE system.
- the normal TTI and the shortened TTI may be mixed in time within the same CC (frequency domain).
- the shortened TTI may be set in a specific subframe of the same CC (or a specific time unit such as a specific radio frame).
- the shortened TTI is set in five consecutive subframes in the same CC, and the normal TTI is set in the other subframes. Note that the number and position of subframes in which the shortened TTI is set are not limited to those illustrated in FIG. 3A.
- carrier aggregation (CA) or dual connectivity (DC) may be performed by integrating the normal TTI CC and the shortened TTI CC.
- the shortened TTI may be set in a specific CC (more specifically, in the DL and / or UL of the specific CC).
- a shortened TTI is set in the DL of a specific CC
- a normal TTI is set in the DL and UL of another CC. Note that the number and position of CCs for which the shortened TTI is set are not limited to those shown in FIG. 3B.
- the shortened TTI may be set to a specific CC (primary (P) cell or / and secondary (S) cell) of the same radio base station.
- the shortened TTI may be set to a specific CC (P cell or / and S cell) in the master cell group (MCG) formed by the first radio base station, or the second radio It may be set to a specific CC (primary secondary (PS) cell or / and S cell) in the secondary cell group (SCG) formed by the base station.
- the shortened TTI may be set to either DL or UL.
- the normal TTI is set in the UL and the shortened TTI is set in the DL.
- a specific DL or UL channel or signal may be assigned (set) to the shortened TTI.
- the uplink control channel (PUCCH: Physical Uplink Control Channel) may be assigned to a normal TTI
- the uplink shared channel (PUSCH: Physical Uplink Shared Channel) may be assigned to a shortened TTI.
- the user terminal performs transmission of PUCCH by normal TTI and transmission of PUSCH by shortened TTI.
- the user terminal sets (or / and detects) a shortened TTI based on an implicit or explicit notification from the radio base station.
- an implicit notification example (2) broadcast information or RRC (Radio Resource Control) signaling, (3) MAC (Medium Access Control) signaling, (4) explicit by PHY (Physical) signaling
- RRC Radio Resource Control
- MAC Medium Access Control
- PHY Physical
- the user terminal transmits an LBT (Listen in frequency band (for example, 5G band, unlicensed band, etc.), system bandwidth (for example, 100 MHz, etc.), LAA (License Assisted Access). Applicability of Before Talk, type of data to be transmitted (eg, control data, voice, etc.), logical channel, transport block, RLC (Radio Link Control) mode, C-RNTI (Cell-Radio Network Temporary Identifier), etc.
- a shortened TTI may be set (for example, it is determined that a cell, a channel, a signal, or the like for communication is a shortened TTI).
- control information (DCI) addressed to the terminal itself is detected in the PDCCH mapped to the first 1, 2, 3, or 4 symbols of the normal TTI and / or 1 ms of EPDCCH
- 1 ms including the PDCCH / EPDCCH is normally used.
- Control information (DCI) addressed to own terminal is detected by PDCCH / EPDCCH (eg, PDCCH mapped to other than the first 1 to 4 symbols of TTI and / or EPDCCH of less than 1 ms) that has a configuration other than that determined as TTI
- a predetermined time interval of less than 1 ms including the PDCCH / EPDCCH may be determined as the shortened TTI.
- the control information (DCI) addressed to the own terminal can be detected based on the CRC check result for the blind-decoded DCI.
- the shortened TTI may be set based on setting information notified from the radio base station to the user terminal by broadcast information or RRC signaling.
- the setting information indicates, for example, which CC or / and subframe is used as a shortened TTI, which channel or / and signal is transmitted / received by the shortened TTI, or the like.
- the user terminal sets the shortened TTI to semi-static based on the setting information from the radio base station.
- mode switching between the shortened TTI and the normal TTI may be performed by an RRC reconfiguration procedure, an intra-cell handover (HO) in the P cell, and a CC (S cell in the S cell. ) Removal / addition procedure.
- the shortened TTI set based on the setting information notified by RRC signaling is activated or deactivated (activate or de-activate) by MAC signaling. May be.
- the user terminal enables or disables the shortened TTI based on an L2 control signal (for example, a MAC control element) from the radio base station.
- the user terminal is set in advance with a timer indicating the activation period of the shortened TTI by higher layer signaling such as RRC.
- the UL / DL allocation of the shortened TTI for a predetermined period is performed. If not done, the shortened TTI may be invalidated.
- Such a shortened TTI invalidation timer may count in units of normal TTI (1 ms), or may count in units of shortened TTI (for example, 0.25 ms). Note that, when switching between the shortened TTI mode and the normal TTI mode in the S cell, the S cell may be de-activated once, or it may be considered that a TA (Timing Advance) timer has expired. Thereby, the communication stop period at the time of mode switching can be provided.
- a shortened TTI set based on setting information notified by RRC signaling may be scheduled by PHY signaling.
- the user terminal receives and detects information included in the L1 control signal (for example, downlink control channel (PDCCH: Physical Downlink Control Channel or EPDCCH: Enhanced Physical Downlink Control Channel; hereinafter referred to as PDCCH / EPDCCH)). Based on, a shortened TTI is detected.
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- control information (DCI) for assigning transmission or reception in normal TTI and shortened TTI includes different information elements, and (4-1) the user terminal performs control including information elements for assigning transmission / reception in shortened TTI.
- DCI control information
- a predetermined time interval including the timing at which the PDCCH / EPDCCH is detected may be recognized as a shortened TTI.
- the user terminal can blind-decode control information (DCI) that allocates transmission or reception of both normal TTI and shortened TTI in PDCCH / EPDCCH.
- the user terminal detects downlink control information (DCI: Downlink) transmitted by the PDCCH / EPDCCH (when the control information (DCI) including an information element to which transmission / reception with the shortened TTI is allocated is detected)
- DCI downlink control information
- a predetermined time interval including the timing at which PDSCH or PUSCH scheduled by Control Information)) is transmitted / received may be recognized as a shortened TTI.
- the PDSCH scheduled by the PDCCH / EPDCCH (DCI transmitted by the PDCCH / EPDCCH) when the control information (DCI) including the information element to which transmission / reception with the shortened TTI is allocated is detected.
- HARQ-ACK Hybrid Automatic Repeat reQuest-Acknowledgement
- ACK / NACK A / N, etc.
- the control information (DCI) instructing transmission / reception with the shortened TTI may be transmitted / received a certain time before transmitting / receiving the shortened TTI.
- the radio base station transmits control information (DCI) instructing transmission / reception with a shortened TTI at a predetermined timing, and when the user terminal receives the control information (DCI), after a predetermined time (for example, an integer having a TTI length) After a double time or an integer time of the subframe length), the shortened TTI is transmitted / received.
- the user terminal changes the signal processing algorithm by transmitting / receiving control information (DCI) instructing transmission / reception with a shortened TTI a predetermined time before actually performing transmission / reception with the shortened TTI. Time to do.
- DCI receiving control information
- a shortened TTI is set by upper layer signaling such as RRC, and a predetermined instruction is given by control information (DCI) transmitted / received by a downlink control channel, a method of switching to transmission / reception by normal TTI may be applied.
- DCI control information
- a shortened TTI that requires signal processing with a low delay requires a higher user processing capacity than a normal TTI. Therefore, by limiting the dynamic switching from the shortened TTI to the normal TTI, the signal processing burden on the user terminal accompanying the change in the TTI length is reduced as compared with the case where the dynamic switching from the normal TTI to the shortened TTI is allowed. be able to.
- the user terminal may detect the shortened TTI based on the state of the user terminal (for example, Idle state or Connected state). For example, in the idle state, the user terminal may recognize all TTIs as normal TTIs and perform blind decoding only on the PDCCH included in the first 1 to 4 symbols of the 1 ms normal TTI. Further, when the user terminal is in the connected state, the user terminal may set (or / and detect) the shortened TTI based on at least one of the above notification examples (1) to (4).
- the state of the user terminal for example, Idle state or Connected state. For example, in the idle state, the user terminal may recognize all TTIs as normal TTIs and perform blind decoding only on the PDCCH included in the first 1 to 4 symbols of the 1 ms normal TTI. Further, when the user terminal is in the connected state, the user terminal may set (or / and detect) the shortened TTI based on at least one of the above notification examples (1) to (4).
- PUCCH format As described above, when the shortened TTI is set, there is a problem of how to configure the PUCCH transmitted by the shortened TTI.
- PUCCH format (hereinafter referred to as PUCCH format, PF, etc.) transmitted in a normal TTI (subframe)
- UCI Uplink Control Information
- HARQ-ACK acknowledgment information
- PDSCH Physical Downlink Shared Channel
- CSI Channel State Information
- PUSCH uplink shared channel
- SR Scheduling Request
- FIG. 4 is a diagram illustrating an example of a PUCCH format used in normal TTI.
- the case where the normal CP is used will be described as an example, but the present invention is not limited to this.
- Each PUCCH format (PF) can be appropriately changed and applied even when an extended CP is used.
- PF1 / 1a / 1b the three symbols at the center of each normal slot are used for demodulation reference signals (DMRS: DeModulation Reference Signal), and the remaining four symbols are used for UCI.
- UCI is modulated by BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying), and spreading (CS spreading and time spreading) with a maximum spreading factor of 36 is applied.
- BPSK Binary Phase Shift Keying
- QPSK Quadrature Phase Shift Keying
- CS spreading and time spreading spreading
- PF2 / 2a / 2b As shown in FIG. 4B, the second and sixth two symbols from the left of each normal slot are used for DMRS, and the remaining five symbols are used for UCI.
- UCI is QPSK-modulated and cyclic shift (CS: Cyclic Shift) spreading with a maximum spreading factor of 12 is applied.
- CS Cyclic Shift
- PF3 As shown in FIG. 4B, the 2nd and 6th 2 symbols from the left of each normal slot are used for DMRS, and the remaining 5 symbols are used for UCI.
- UCI is QPSK modulated and time spreading with a maximum spreading factor of 5 is applied. In PF3, a maximum of 48 bits are transmitted.
- PF4 As shown in FIG. 4C, one symbol at the center of each normal slot is used for DMRS, and the remaining six symbols are used for UCI. Further, one or a plurality of resource blocks (physical resource block (PRB: Physical Resource Block) (2PRB in FIG. 4C) is used per slot. UCI is QPSK modulated and spreading is not applied. In PF4, 1 or 1 is used. A plurality of PRBs transmit a predetermined number of bits (for example, 100 bits or more).
- PRB Physical Resource Block
- PF5 As shown in FIG. 4D, one symbol at the center of each normal slot is used for DMRS, and the remaining six symbols are used for UCI.
- UCI is QPSK modulated and frequency spreading with a maximum spreading factor of 2 is applied. Also, 1 PRB is normally used per slot.
- a predetermined number of bits (for example, 50 bits or more) are transmitted.
- each PF of the normal TTI as described above cannot be directly applied to a shortened TTI (see FIG. 2B) configured with a smaller number of symbols than the normal TTI.
- FIG. 5 is a diagram illustrating an application example of the shortened TTI of PF1 / 1a / 1b.
- the same bit string is copied to each symbol for UCI (hereinafter also referred to as an information symbol) in each normal slot, and a plurality of user terminals have mutually different orthogonal spreading codes ( For example, it is multiplexed by an orthogonal sequence having a sequence length of 4).
- the shortened TTI is configured with a number of symbols smaller than one slot (for example, 4 symbols)
- spreading codes in the time (symbol) direction are not orthogonal (for example, an orthogonal sequence with a sequence length of 4). Therefore, a plurality of user terminals cannot be multiplexed appropriately.
- FIG. 5C when the shortened TTI is composed of the same number of symbols as the normal slot (7 symbols in the normal CP), the orthogonality of the spreading code in the time direction can be maintained (for example, the sequence length 4 Therefore, a plurality of user terminals can be appropriately multiplexed.
- FIG. 5 shows an example of PF1 / 1a / 1b, but the same applies to PF3.
- FIG. 6 is a diagram illustrating an application example of the shortened TTI of PF2 / 2a / 2b. As shown in FIG. 6A, in PF2 / 2a / 2b, different information bits (for example, 2 encoded bits) are mapped to each information symbol.
- a shortened TTI when a shortened TTI is applied to PF2 / 2a / 2b, only a number of encoded bits proportional to the number of information symbols in the shortened TTI can be mapped.
- FIG. 5 shows an example of PF2 / 2a / 2b, but the same applies to PF4 / 5.
- each PUCCH format of normal TTI does not conform to a shortened TTI (see FIG. 2B) configured with a smaller number of symbols than normal TTI.
- a shortened TTI see FIG. 2B
- the effect of latency reduction hereinafter referred to as delay reduction effect
- delay reduction effect by applying shortened TTI to other physical channels is limited. .
- the present inventors have studied that it is desirable to apply the shortened TTI to the PUCCH in order to efficiently obtain the delay reduction effect, and examined a PUCCH format suitable for the shortened TTI.
- the shortened TTI (second TTI) is configured with a smaller number of symbols than the normal TTI (first TTI), and each symbol has the same symbol length as the normal TTI (FIG. 2B). reference).
- the number of shortened TTIs included in the normal TTI is, for example, 2, 4, but is not limited thereto.
- the shortened TTI may be called a partial TTI (short TTI), a short TTI, an sTTI, a shortened subframe, a short subframe, or the like.
- the normal TTI is also called TTI, long TTI, lTTI, normal TTI, normal subframe, long subframe, normal subframe, or simply subframe.
- a slot that is a unit of frequency hopping in the shortened TTI is also referred to as a shortened slot, a partial slot, a short slot, or the like.
- a slot that is a unit of frequency hopping in normal TTI is also called a normal slot, a long slot, a normal slot, or simply a slot.
- slots serving as units of frequency hopping for each of the shortened TTI and the normal TTI are referred to as a shortened slot and a normal slot.
- a reference signal used for PUCCH demodulation (channel estimation) is referred to as a demodulation reference signal (DMRS), but the name of the reference signal is not limited thereto.
- the user terminal which concerns on a 1st aspect transmits UCI via PUCCH in shortened TTI comprised with a symbol number smaller than normal TTI. Specifically, the user terminal transmits UCI by PRB that performs frequency hopping between the shortened slots in the shortened TTI, and maps the DMRS to at least one symbol constituting the shortened slot.
- PF new PUCCH format
- FIG. 7 is a diagram illustrating a first configuration example of the new PF according to the first aspect.
- FIG. 7A shows a case with two shortened TTIs per regular TTI (one shortened TTI per regular slot), and
- FIG. 7B shows a case with four shortened TTIs per regular TTI (two shortened TTIs per regular slot). .
- the allocated PRB is changed from a PRB at one end of a frequency band (for example, a system band) supported by the user terminal (hereinafter referred to as a support band) to a PRB at the other end.
- Changed frequency hopping is applied.
- at least one DMRS symbol is provided in a predetermined number of symbols (shortened slots) to which the same PRB is assigned.
- a spread code may be applied between the information symbols.
- the PRB at one end of the support band is allocated in the first shortened slot (symbol # 0- # 2) of each shortened TTI, In the second half of the shortened slot (symbol # 3- # 6), the PRB at the other end is assigned.
- DMRS is mapped to the central symbol # 1.
- DMRS is mapped to symbol # 4.
- the UCI can be transmitted with two information symbols excluding the DMRS symbol in the shortened slot including the final symbol.
- CS spreading with a predetermined spreading factor (for example, maximum spreading factor 12) is applied to each information symbol in the shortened slot, and a plurality of information symbols (for example, symbols # 0 and # 2 in the shortened slot) are applied.
- a predetermined spreading factor for example, a spreading factor equal to the number of information symbols in the shortened slot.
- CS spreading with a maximum spreading factor of 12 may be applied to each of the symbols # 0 and # 2
- block spreading with a maximum spreading factor of 2 may be applied between the symbols # 0 and # 2.
- each shortened TTI when each shortened TTI is composed of four symbols, at least one symbol may be shared between adjacent shortened TTIs.
- the central symbol (symbol # 3) in the normal slot is shared between two shortened TTIs in the normal slot.
- each shortened TTI is composed of first half and second half shortened slots, and frequency hopping is applied between the shortened slots.
- the frequency hopping pattern may be reversed between the two shortened TTIs sharing the symbol # 3.
- each shortened slot is provided with at least one DMRS symbol.
- DMRS symbol # 3 is shared between two shortened TTIs in the normal slot.
- the DMRSs of the plurality of shortened TTIs may be multiplexed by cyclic shift and / or comb-shaped subcarrier arrangement (Comb).
- the same information symbol may be shared among a plurality of shortened TTIs.
- the plurality of shortened TTI UCIs may be multiplexed by Comb.
- 7A and 7B are merely examples, and are not limited thereto.
- the number of shortened TTIs included in a normal TTI is not limited to this.
- frequency hopping within the shortened TTI is not limited to that performed in the first half and second half shortened slots, and for example, frequency hopping may be applied for each symbol.
- FIGS. 7A and 7B in different shortened TTIs, different user terminals may transmit PUCCH, or the same user terminal may transmit PUCCH.
- the configuration examples shown in FIGS. 7A and 7B may be combined.
- one shortened TTI may be set as shown in FIG. 7A
- two shortened TTIs may be set as shown in FIG. 7B, or vice versa. May be set.
- FIG. 8 is a diagram illustrating a second configuration example of the new PF according to the first aspect.
- FIG. 8A shows a case where each shortened TTI is composed of 7 symbols
- FIG. 8B shows a case where each shortened TTI is composed of 4 symbols. Note that FIG. 8 will be described with a focus on differences from FIG.
- the new PF may be composed of one or more PRBs per shortened slot.
- the new PF is configured with 2 PRBs per shortened slot.
- the new PF has a smaller number of information symbols than the normal TTI PF, and thus the payload is reduced (or the coding gain and spreading processing gain due to coding and spreading are reduced).
- FIGS. 8A and 8B by extending the new PF in the frequency direction, it is possible to compensate for a decrease in payload due to a decrease in information symbols (or an improvement in coding gain or spreading processing gain due to coding or spreading).
- FIG. 9 is a diagram illustrating a third configuration example of the new PF according to the first aspect.
- FIG. 9A shows a case where each shortened TTI is composed of 7 symbols
- FIG. 9B shows a case where each shortened TTI is composed of 4 symbols. Note that FIG. 9 will be described focusing on the differences from FIGS.
- a shortened format (Shortened format) that omits the final symbol may be applied to the shortened TTI.
- a format that does not omit the final symbol may be referred to as a normal format.
- the number of symbols of the shortened TTI of the shortened format may be a value obtained by subtracting 1 from the number of symbols of the shortened TTI of the normal format.
- FIG. 10 is a diagram illustrating a diffusion example in the new PF according to the first aspect.
- FIG. 10A shows an example of block spreading (orthogonal spreading) in a shortened slot.
- an orthogonal spreading code having a sequence length (spreading rate, code length) equal to the number of the plurality of information symbols is used between the plurality of information symbols. Diffusion may be performed.
- the user terminal copies the same UCI (modulation symbol) between a plurality of information symbols in the shortened TTI, and has a length equal to the number (N) of information symbols in the shortened slot for the copied UCI.
- spreading may be performed using orthogonal spreading codes [W 0 ,..., W N ⁇ 1 ].
- the first half of the shortened slot in the shortened TTI contains 2 information symbols, and the latter half of the shortened slot contains 3 information symbols.
- the same UCI is copied to symbols # 0 and # 2
- the UCI of symbol # 0 is multiplied by an orthogonal spreading code [W 0 , W 1 ] having a code length of 2
- symbol # 2 W 1 may be multiplied by the UCI.
- the same UCI is copied to symbols # 3, # 5, and # 6, and the WCI of code length 3 orthogonal spreading code [W 0 , W 1 , W 2 ] is copied to the UCI of symbol # 3.
- 0 is multiplied, is multiplied by W 1 to UCI symbol # 5, it may be W 2 is multiplied by UCI symbols # 6.
- diffusion can also be performed in a frequency (subcarrier) direction.
- 12 ⁇ M subcarriers are used per symbol. Therefore, 12 ⁇ M subcarriers can be divided into N groups, 12 ⁇ M / N symbols can be mapped to each group, and can be spread with a spreading code of length N.
- FIG. 10B shows an example of CS spreading (phase rotation) in each information symbol.
- the user terminal maps different UCI (modulation symbols) to each information symbol in the shortened TTI, and uses CS of a predetermined length (spreading factor) for each UCI of each information symbol. May be performed.
- different UCIs may be mapped to symbols # 0 and # 2, respectively, and multiplied by a length 12 CS sequence.
- different UCIs are mapped to symbols # 3, # 5, and # 6, respectively, and multiplied by a CS sequence having a sequence length of 12.
- the payload of the UCI can be increased in proportion to the number of information symbols in the shortened TTI.
- each shortened TTI is composed of 7 symbols (see FIG. 7A), but is not limited thereto.
- the spreading examples shown in FIGS. 10 and 10B are also applicable as appropriate when each shortened TTI is composed of 4 symbols (see FIG. 7B). Also, as described with reference to FIG. 7A, the diffusion examples shown in FIGS. 10A and 10B may be combined.
- FIG. 11 is a diagram illustrating an example of the PRB index used in the first mode.
- FIG. 11A shows a case where each shortened TTI is composed of 7 symbols
- FIG. 11B shows a case where each shortened TTI is composed of 4 symbols.
- the numbers given in FIGS. 11A and 11B indicate the PRB index (PRB index).
- 11A and 11B show the support band of the user terminal, and the upper part of the frequency band is low and the lower part is high, but this may be reversed.
- the same PRB index has a frequency position that is symmetric about the center frequency of the user terminal in the first and second shortened slots. It is attached to PRB.
- PRB index # 1 is assigned to the PRB having the lowest frequency in the support band in the first half of the shortened slot, and to the PRB having the highest frequency in the second half of the shortened slot.
- the PRB index is assigned in ascending order from the outside of the support band of the user terminal.
- the same PRB index is symmetrical about the center frequency of the user terminal in the first and second shortened slots. Is attached to the PRB at the frequency position.
- the PRB index of each of the plurality of shortened TTIs may be attached to the PRB of the shared symbol.
- the PRB index # 2 for the first shortened TTI and the PRB index # 1 for the second shortened TTI are attached to the PRB having the lowest frequency of the shared symbol.
- the PRB index n PRB as described above may be given based on the following formula (1), for example.
- the parameter m is a value determined from the PUCCH resource
- parameter n x is a number of shorter slots for shortening TTI (index).
- N UL RB indicates the uplink support band of the user terminal. Note that the PRB index assignment method is not limited to this.
- the frequency hopping is applied within the shortened TTI by the new PF for the shortened TTI, it is possible to prevent the performance degradation of the PUCCH while obtaining the delay reduction effect accompanying the introduction of the shortened TTI.
- the user terminal which concerns on a 2nd aspect transmits UCI via PUCCH in shortened TTI comprised with a symbol number smaller than normal TTI. Specifically, the user terminal transmits a UCI of a shortened TTI using a part of a normal TTI PF, and maps the DMRS to at least one symbol constituting the shortened TTI.
- FIG. 12 is a diagram illustrating a first configuration example based on PF1 / 1a / 1b according to the second aspect.
- a shortened TTI having the same number of symbols as that of a normal slot that is, a shortened TTI of 0.5 ms
- a shortened TTI having a number of symbols different from that of the normal slot is allowed.
- the PF1 / 1a / 1b / 3 configuration of the normal slot in the first half (or the second half) of the normal TTI of 1 ms is applied to the 0.5 ms shortened TTI.
- FIG. 12A shows an application example of PF1 / 1a / 1b for a shortened TTI of 0.5 ms.
- CS spreading phase rotation
- orthogonal spreading time spreading
- an orthogonal sequence having a sequence length of 4 are applied to 4 information symbols in a shortened TTI ( That is, a spreading code with a spreading factor of 48 is applied).
- a CAZAC Constant Amplitude Zero Auto-Correlation
- phase rotation determined as a function of the PUCCH resource index of PF1 / 1a / 1b and orthogonal spreading of sequence length 3 A sign is applied.
- an orthogonal spreading code having a sequence length of 3 determined by a function of a PUCCH resource index can be applied to improve orthogonality between users multiplexed in the same PRB.
- FIG. 12B shows an application example of PF3 for a shortened TTI of 0.5 ms.
- orthogonal spreading time spreading
- an orthogonal sequence with a sequence length of 5 is applied to 5 information symbols in the shortened TTI (that is, a spreading code with a spreading factor of 5 is applied).
- an orthogonal spreading code having a sequence length of 2 determined by a function of the PUCCH resource index can be applied to improve orthogonality between users multiplexed on the same PRB.
- the existing PF1 / 1a / 1b / 3 is used without introducing a new PF.
- the existing PF generation circuit can be used. For this reason, the delay reduction effect accompanying the introduction of the 0.5 ms shortened TTI can be obtained without applying a new design load.
- FIG. 13 is a diagram illustrating a second configuration example based on PF1 / 1a / 1b according to the second aspect. As shown in FIG. 13, in the second configuration example, a shortened TTI having a number of symbols different from that of the normal slot is allowed.
- FIG. 13A shows an application example of PF1 / 1a / 1b to a shortened TTI composed of four symbols.
- CS spreading phase rotation
- orthogonal spreading time spreading
- an orthogonal sequence having a sequence length of 2 are applied to two information symbols in the shortened TTI ( That is, a spreading code with a spreading factor of 24 is applied).
- a spreading code with a spreading factor of 24 is applied.
- a CAZAC sequence defined for 1PRB is used, and phase rotation determined as a function of the PUCCH resource index of PF1 / 1a / 1b is applied.
- an orthogonal spreading code having a sequence length of 2 determined by a function of a PUCCH resource index can be applied to improve orthogonality between users multiplexed in the same PRB.
- FIG. 13B shows an application example of PF3 to a shortened TTI composed of 4 symbols.
- orthogonal spreading time spreading
- 3 information symbols in the shortened TTI that is, a spreading code with a spreading factor of 3 is applied.
- FIG. 13 shows an application example of PF1 / 1a / 1b / 3 to a shortened TTI composed of four symbols, but the number of symbols constituting the shortened TTI is not limited to this, and can be applied by changing as appropriate. is there.
- the number of symbols constituting the shortened TTI only needs to be different from the number of symbols constituting the normal slot, and may be small or large.
- FIG. 13A when the shortened TTI is composed of 3 symbols, only CS spreading by a CS sequence having a sequence length of 12 may be applied to 1 DMRS symbol (ie, a spreading code having a spreading factor of 12). May apply).
- FIG. 13B when the shortened TTI is composed of 3 symbols, orthogonal spreading (time spreading) by an orthogonal sequence having a sequence length of 2 may be applied to 2 information symbols (that is, spreading factor 2). May be applied).
- FIG. 14 is a diagram illustrating a setting example of the shortened TTI in the second configuration example based on PF1 / 1a / 1b / 3. As shown in FIGS. 14A and 14B, all the shortened TTIs in the normal TTI may be composed of 4 symbols. 14A shows an example of setting a shortened TTI based on PF1 / 1a / 1b, and FIG. 14B shows an example of setting a shortened TTI based on PF3.
- the DMRS symbol (symbol # 3) is shared between the first half and the second half of the shortened TTI in the normal slot. Specifically, the user terminal transmits the DMRS using the symbol # 3 when transmitting the PUCCH in either the first half or the second half of the normal slot in the shortened TTI.
- the first half and the second half of the shortened TTI DMRS may be multiplexed by cyclic shift (CS) or Comb. Specifically, the first half and the second half of the shortened TTI DMRS may be multiplied by CS sequences of different CS indexes. Alternatively, different combs may be allocated to the DMRS of the shortened TTI in the first half and the second half.
- CS cyclic shift
- Comb Comb
- the information symbol (symbol # 3) is shared between the first half and the second half of the shortened TTI in the normal slot. Specifically, the user terminal transmits the UCI using the symbol # 3 when transmitting the PUCCH in either the first half or the second half of the normal slot.
- the UCIs of the first half and the second half of the shortened TTI may be multiplexed by Comb.
- FIG. 15 is a diagram illustrating another setting example of the shortened TTI in the second configuration example based on PF1 / 1a / 1b / 3.
- the shortened TTI in the normal TTI may be configured with 3 or 4 symbols.
- FIG. 15A shows a setting example of a shortened TTI based on PF1 / 1a / 1b
- FIG. 15B shows a setting example of a shortened TTI based on PF3.
- the first half of the shortened TTI in the normal slot includes two information symbols and two DMRS symbols.
- the second half of the shortened TTI includes two information symbols and one DMRS symbol.
- spreading codes having different sequence lengths may be applied to the first half and the second half of the shortened TTI.
- CS spreading with a CS sequence with a sequence length of 12 and orthogonal spreading with an orthogonal sequence with a sequence length of 2 are applied to DMRS (that is, a spreading code with a spreading factor of 24). Apply).
- DMRS that is, a spreading code with a spreading factor of 24.
- the first half of the shortened TTI in the normal slot includes 3 information symbols and 1 DMRS symbol.
- the second half of the shortened TTI includes two information symbols and one DMRS symbol.
- spreading codes having different sequence lengths may be applied to the UCI of the first half and the second half of the shortened TTI.
- orthogonal spreading with an orthogonal sequence having a sequence length of 3 is applied to UCI (that is, a spreading code with a spreading factor of 3 is applied).
- orthogonal spreading with an orthogonal sequence having a sequence length of 2 is applied to UCI (that is, a spreading code with a spreading factor of 2 is applied).
- the first half of the shortened TTI in the normal slot is composed of 4 symbols, and the latter half of the shortened TTI is composed of 3 symbols.
- the TTI may be composed of 4 symbols.
- PF2 / 2a / 2b / 4/5 ⁇ Configuration example based on PF2 / 2a / 2b / 4/5>
- the payload is changed according to the number of information symbols in the shortened TTI.
- PF2 / 2a / 2b / 4/5 since the problem of orthogonality in the time direction does not occur unlike PF1 / 1a / 1b / 3, PF2 / 2a / 2b / 4/5 has a shortened TTI with the same number of symbols as a normal slot and a normal slot. Can be applied to both shortened TTIs with different numbers of symbols.
- FIG. 16 is a diagram illustrating a configuration example based on PF2 / 2a / 2b / 4/5 according to the second aspect.
- a shortened TTI configured with a smaller number of symbols than a normal slot is shown, but this configuration example is also applicable to a shortened TTI having the same number of symbols as a normal slot.
- FIG. 16A shows an application example of PF2 / 2a / 2b to a shortened TTI composed of 4 symbols.
- different UCIs are mapped to the three information symbols in the shortened TTI, and CS spreading (phase rotation) by a CS sequence having a sequence length of 12 is applied in the same information symbol (that is, A spreading code with a spreading factor of 12 is applied).
- CS spreading phase rotation
- a phase rotation determined as a function of a PUCCH resource index of PF2 or a function of multiplexed HARQ-ACK is applied to a CAZAC sequence for 1 PRB.
- FIG. 16B shows an application example of PF4 to a shortened TTI composed of 4 symbols.
- different UCIs are mapped to the three information symbols in the shortened TTI of each PRB, and spreading is not applied. Also, no spreading is applied to one DMRS symbol in the shortened TTI.
- FIG. 16C shows an application example of PF5 to a shortened TTI composed of 4 symbols.
- different UCIs are mapped to the three information symbols in the shortened TTI, and CS spreading (phase rotation) by a CS sequence having a sequence length of 12 is applied in the same information symbol (maximum spreading).
- the rate is 2).
- a phase rotation determined as a function of the PUCCH resource index of PF5 is applied to a CAZAC sequence for 1 PRB.
- PF2 / 2a / 2b / 5 when PF2 / 2a / 2b / 5 is applied to a shortened TTI, spreading and user multiplexing can be performed as in the case of applying to a normal TTI.
- FIG. 16B when PF4 is applied to a shortened TTI, a plurality of PRBs can be used as in the case of applying to a normal TTI.
- FIG. 17 is a diagram illustrating a setting example of the shortened TTI in the configuration example based on PF2 / 2a / 2b / 4/5. As shown in FIGS. 17A to 17C, all the shortened TTIs in the normal TTI may be composed of 4 symbols. 17A shows a configuration example based on PF2 / 2a / 2b, FIG. 17B shows a configuration example based on PF4, and FIG. 17C shows a configuration example based on PF5.
- the information symbol (symbol # 3) is shared between the first half and the second half of the shortened TTI in the normal slot. Specifically, the user terminal transmits the UCI using the symbol # 3 when transmitting the PUCCH in either the first half or the second half of the normal slot.
- symbol # 3 of FIG. 17A the UCIs of the first half and the second half of the shortened TTI may be multiplexed by Comb.
- the DMRS symbol (symbol # 3) is shared between the first half and the second half of the shortened TTI in the normal slot. Specifically, the user terminal transmits the DMRS using the symbol # 3 when transmitting the PUCCH in either the first half or the second half of the normal slot in the shortened TTI.
- the first half and the second half of the shortened TTI DMRS may be multiplexed by cyclic shift (CS) or Comb. Specifically, the first half and the second half of the shortened TTI DMRS may be multiplied by CS sequences of different CS indexes. Alternatively, different combs may be allocated to the DMRS of the shortened TTI in the first half and the second half.
- CS cyclic shift
- Comb Comb
- the first half and the second half of the shortened TTI DMRS may be multiplied by CS sequences of different CS indexes.
- different combs may be allocated to the DMRS of the shortened TTI in the first half and the second half.
- FIG. 18 is a diagram illustrating another setting example of the shortened TTI in the configuration example based on PF2 / 2a / 2b / 4/5.
- the shortened TTI in the normal TTI may be composed of 3 or 4 symbols.
- 18A shows a configuration example based on PF2 / 2a / 2b
- FIG. 18B shows a configuration example based on PF4
- FIG. 18C shows a configuration example based on PF5.
- the first half TTI in the normal slot includes 3 information symbols and 1 DMRS symbol.
- the second half of the shortened TTI includes two information symbols and one DMRS symbol.
- the UCI payload is different between the first half and the second half of the shortened TTI.
- the first half of the shortened TTI in the normal slot includes 3 information symbols and 1 DMRS symbol.
- the symbol # 4 may be changed from the information symbol to the DMRS symbol. Accordingly, since the DMRS symbol is also included in the second half of the shortened TTI, UCI demodulation (channel estimation) of the second half of the shortened TTI can be appropriately performed.
- the first half shortened TTI in the normal slot is composed of four symbols
- the second half shortened TTI is composed of three symbols.
- the first half shortened TTI is composed of three symbols
- the second half shortened TTI is It may be composed of 4 symbols.
- the existing PUCCH format is applied to the shortened TTI, it is possible to reduce the design load for obtaining the delay reduction effect accompanying the introduction of the shortened TTI.
- a shortened TTI having the same number of symbols as the normal slot for example, 7 symbols for normal CP and 6 symbols for extended CP.
- a shortened TTI having a smaller number of symbols (for example, 3 or 4 symbols) than a normal slot may be allowed.
- a user terminal in which a shortened TTI is set transmits a shortened TTI having the same number of symbols as the normal slot, and transmits a PF2 / 2a / 2b / 4/5 transmission.
- a shortened TTI having a smaller number of symbols than a normal slot may be transmitted.
- a user terminal that transmits a shortened TTI having a smaller number of symbols than that of a normal slot transmits the PF2 / 2a / 2b / 4/5 regardless of the contents of UCI (SR, HSRQ-ACK, CQI, etc.). It is good also as what to do.
- the predetermined PF is used regardless of the contents of the UCI. Also good.
- the third aspect a condition for transmitting PUCCH with a shortened TTI will be described. Note that the third aspect may be combined with any of the first and second aspects.
- the user terminal may determine to perform PUCCH transmission with a shortened TTI, for example, under any of the following conditions (1) to (3).
- the user terminal may always transmit the PUCCH with the shortened TTI. In this case, since the PUCCH transmission is performed with the shortened TTI regardless of the conditions, the delay reduction effect can be maximized.
- the user terminal may transmit the PUCCH with the shortened TTI. Good.
- fallback Fallback to normal TTI PUCCH can be performed, thereby preventing connection quality degradation.
- the terminal may transmit the PUCCH with a shortened TTI.
- an L1 / L2 control signal such as PDCCH
- the terminal may transmit the PUCCH with a shortened TTI.
- it is possible to prevent deterioration of connection quality, and it is possible to easily perform control in which carriers for transmitting and receiving the control channel and the data channel are separated when cross carrier scheduling is applied.
- wireless communication system Wireless communication system
- the radio communication method according to each of the above aspects is applied.
- wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.
- FIG. 19 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment.
- 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.
- the radio communication system 1 shown in FIG. 19 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 uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the uplink.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink 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. Including. 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 shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared 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 by the PUSCH.
- Uplink control information including at least one of delivery confirmation information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- FIG. 20 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment.
- 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 be configured to 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 downlink 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 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 uplink 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 transmission / reception unit 103 receives the UCI via the PUCCH in a shortened TTI (second TTI) configured with a smaller number of symbols than the normal TTI (first TTI). Further, the transmission / reception unit 103 receives a DMRS used for demodulation of the UCI.
- 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 upstream 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. 21 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment.
- FIG. 21 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, and a reception signal processing unit 304.
- the control unit 301 controls the entire radio base station 10.
- the control unit 301 controls, for example, generation of a downlink signal by the transmission signal generation unit 302, signal mapping by the mapping unit 303, and reception processing (for example, demodulation) of the uplink signal by the reception signal processing unit 304.
- control unit 301 performs downlink (DL) signal transmission control (for example, modulation scheme, coding rate, resource allocation (scheduling)) based on channel state information (CSI) reported from the user terminal 20. Control).
- DL downlink
- CSI channel state information
- control unit 301 controls a transmission time interval (TTI) used for receiving a downlink signal and / or transmitting an uplink signal.
- TTI transmission time interval
- the control unit 301 sets a normal TTI of 1 ms or / and a shortened TTI shorter than the normal TTI.
- the configuration example and setting example of the shortened TTI are as described with reference to FIGS.
- the control unit 301 provides the user terminal 20 with an explicit notification by at least one of (1) implicit notification, or (2) RRC signaling, (3) MAC signaling, and (4) PHY signaling.
- the setting of the shortened TTI may be instructed.
- control unit 301 may set a shortened TTI composed of the same number of symbols as the normal slot (for example, 7 symbols in the case of normal CP), or a different number of symbols (for example, different from the normal slot) (4 symbols or 3 symbols) may be set.
- control unit 301 may set a plurality of shortened TTIs having the same number of symbols (for example, 7 or 4 symbols) in the normal TTI, or different numbers of symbols (for example, 7, 3 and A plurality of shortened TTIs (such as a combination of 4 symbols) may be set.
- 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 downlink signal (including a downlink data signal and a downlink control signal) based on an instruction from the control unit 301 and outputs it to the mapping unit 303. Specifically, the transmission signal generation unit 302 generates a downlink data signal (PDSCH) including notification information (control information) by the above-described higher layer signaling and user data, and outputs it to the mapping unit 303. Also, the transmission signal generation unit 302 generates a downlink control signal (PDCCH / EPDCCH) including the above-described DCI, and outputs it to the mapping unit 303. Also, the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- PDSCH downlink data signal
- PDCCH / EPDCCH downlink control signal
- the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- 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 downlink 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 it 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 uplink signal transmitted from the user terminal 20. Specifically, the received signal processing unit 304 demodulates the UCI received via the PUCCH at each shortened TTI (or each shortened slot) using the DMRS received at each shortened TTI (or each shortened slot). To do. The processing result is output to the control unit 301.
- reception processing for example, demapping, demodulation, decoding, etc.
- 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.
- FIG. 22 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment.
- 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 downlink 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.
- Downlink data (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.
- the uplink 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, rate matching, puncturing, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Are transferred to each transmitting / receiving unit 203. Also for UCI, channel coding, rate matching, puncturing, DFT processing, IFFT processing, and the like are performed and transferred to each transmitting / receiving section 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 transmits UCI via the PUCCH in a shortened TTI (second TTI) configured with a smaller number of symbols than the normal TTI (first TTI). Further, the transmission / reception unit 203 transmits DMRS used for demodulation of the UCI.
- 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. 23 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment.
- FIG. 23 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 a transmission time interval (TTI) used for receiving a downlink (DL) signal and / or transmitting an uplink (UL) signal.
- TTI transmission time interval
- the control unit 301 sets a normal TTI of 1 ms or / and a shortened TTI shorter than the normal TTI.
- the configuration example and setting example of the shortened TTI are as described with reference to FIGS.
- the control unit 401 is based on an explicit notification from the radio base station 10 (1) an implicit notification or at least one of (2) RRC signaling, (3) MAC signaling, and (4) PHY signaling.
- the shortened TTI may be set (detected).
- control unit 401 may set a shortened TTI composed of the same number of symbols as the normal slot (for example, 7 symbols in the case of normal CP), or a different number of symbols (for example, different from the normal slot) (4 symbols or 3 symbols) may be set. Further, the control unit 401 may set a plurality of shortened TTIs having the same number of symbols in the normal TTI (for example, 7 or 4 symbols), or different numbers of symbols (for example, 7, 3 and A plurality of shortened TTIs (such as a combination of 4 symbols) may be set.
- control unit 401 controls UCI transmission using PUCCH in the shortened TTI set as described above. Specifically, the control unit 401 transmits UCI by PRB that performs frequency hopping between the shortened slots in the shortened TTI, and maps the DMRS to at least one symbol that constitutes the shortened slot.
- the mapping unit 403 and the transmission / reception unit 203 may be controlled (first mode). Further, the control unit 401 may determine a PRB to be frequency hopped between the shortened slots in the shortened TTI based on the number of the shortened slot (first mode).
- control unit 401 transmits the UCI of the shortened TTI using a part of the normal TTI PUCCH format (PF1 / 1a / 1b / 2 / 2a / 2b / 3/4/5), and the shortened TTI is transmitted.
- the transmission signal generation unit 402, the mapping unit 403, and the transmission / reception unit 203 may be controlled so as to map the DMRS to at least one symbol that constitutes (second mode).
- control unit 401 may apply orthogonal spreading (time and / or frequency spreading) using orthogonal spreading codes within the shortened TTI. Specifically, the control unit 401 may apply time spreading using orthogonal spreading codes having a length equal to the number of the plurality of symbols between the plurality of symbols in the shortened slot to which UCI is mapped (for example, FIG. 10A). In addition, the control unit 401 divides 12 ⁇ M subcarriers into N groups in a PF using PRB of M (M ⁇ 1) or more (for example, new PF, PF4, etc.), and has a sequence length of N. Frequency spreading may be applied with an orthogonal spreading code.
- control unit 401 may apply phase rotation at each symbol in the shortened TTI. Specifically, the control unit 401 may apply spreading (phase rotation) by cyclic shift (CS) between subcarriers of symbols mapping UCI or DMRS (for example, FIG. 10B).
- CS cyclic shift
- the control unit 401 may multiplex DMRSs of the plurality of shortened TTIs to the same symbols using Comb or cyclic shift ( For example, FIG. 7B, 14A, 17B, 17C). Further, when the same symbol is shared by a plurality of shortened TTIs, the control unit 401 may multiplex the UCI of each of the plurality of shortened TTIs to the same symbol using Comb (for example, FIG. 14B, 17A).
- control unit 401 may transmit UCI using a plurality of resource blocks per slot (for example, FIGS. 8A, 8B, 16B, 17B, and 18B).
- control unit 401 may apply a format in which the final symbol is omitted to the shortened TTI including the final symbol (for example, FIG. 9A, 9B).
- control unit 401 (1) always transmits the PUCCH with the shortened TTI when the shortened TTI PUCCH transmission and the TTI length are configured by the higher layer signaling (in the first or second mode) It may be controlled (using PF) (third mode).
- control unit 401 (2) transmits the PUCCH with the shortened TTI when the shortened TTI PUCCH transmission and the TTII length thereof are set by higher layer signaling and when the shortened TTI PDSCH is scheduled. You may control (it uses the PF of the 1st or 2nd aspect) (3rd aspect).
- the control unit 401 detects (3) an L1 / L2 control signal (such as a PDCCH) that schedules the shortened TTI PDSCH when the PUCCH transmission of the shortened TTI and the TTI length thereof are set by higher layer signaling.
- an L1 / L2 control signal such as a PDCCH
- the PUCCH may be transmitted using the shortened TTI (the PF of the first or second aspect is used) (third aspect).
- 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 Based on an instruction from the control unit 401, the transmission signal generation unit 402 generates an uplink signal (including an uplink data signal and an uplink control signal) (for example, encoding, rate matching, puncturing, modulation, etc.) and performs mapping. Output to the unit 403.
- an uplink signal including an uplink data signal and an uplink control signal
- an uplink control signal for example, encoding, rate matching, puncturing, modulation, etc.
- the transmission signal generation unit 402 encodes UCI, modulates it with a predetermined modulation scheme (for example, BPSK, QPSK), and spreads it according to an instruction from the control unit 401. Also, transmission signal generation section 402 generates a DMRS used for UCI demodulation (channel estimation), spreads it according to an instruction from control section 401, and outputs it to mapping section 403.
- the transmission signal generation unit 402 may 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 signal and / or uplink data signal) generated by the transmission signal generation unit 402 to a radio resource and outputs the radio signal to the transmission / reception unit 203. To do.
- 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 downlink signals (including downlink control signals and downlink data signals).
- 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 the channel state based on a reference signal (for example, CSI-RS) from the radio base station 10 and outputs the measurement result to the control unit 401. Note that the channel state measurement may be performed for each CC.
- a reference signal for example, 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, user terminal, and the like in this embodiment may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 24 is a diagram illustrating an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the present embodiment.
- the storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input.
- the output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 may include hardware such as a microprocessor, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). A part or all of each functional block may be realized by the hardware.
- the processor 1001 may be implemented by at least one of these hardware.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be variously changed.
- 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 a predetermined index.
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- 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 (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)). ), SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), 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.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- MAC CE Control Element
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), 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), systems using other appropriate systems and / or extended based on these It may be applied to the next generation system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- communication system 5G (5th generation mobile communication system
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Abstract
Description
第1の態様では、短縮TTI内で周波数ホッピングを適用するPUCCHフォーマット(新規PUCCHフォーマット(PF))を新たに規定する場合について説明する。第1の態様に係るユーザ端末は、通常TTIよりも少ないシンボル数で構成される短縮TTIにおいて、PUCCHを介してUCIを送信する。具体的には、当該ユーザ端末は、短縮TTI内の短縮スロット間で周波数ホッピングするPRBでUCIを送信し、当該短縮スロットを構成する少なくとも一つのシンボルにDMRSをマッピングする。
図7は、第1の態様に係る新規PFの第1の構成例を示す図である。図7Aでは、通常TTIあたり2つの短縮TTI(通常スロットあたり1つの短縮TTI)を含む場合、図7Bでは、通常TTIあたり4つの短縮TTI(通常スロットあたり2つの短縮TTI)を含む場合が示される。
ここで、新規PFにおける拡散について詳述する。新規PFでは、所定の拡散率で直交拡散(時間及び/又は周波数拡散)を適用することにより、複数のユーザ端末が符号分割多重(CDM)されてもよい。また、新規PFでは、各シンボルで位相回転(CS拡散)が適用されてもよい。図10は、第1の態様に係る新規PFにおける拡散例を示す図である。
図11は、第1の態様で用いられるPRBインデックスの一例を示す図である。図11Aでは、各短縮TTIが7シンボルで構成される場合、図11Bでは、各短縮TTIが4シンボルで構成される場合が示される。また、図11A及び11B内に付される番号は、PRBのインデックス(PRBインデックス)を示すものとする。また、図11A及び11Bでは、ユーザ端末のサポート帯域が示されており、当該周波数帯域の上部が低く、下部が高いものとするが、これとは逆であってもよい。
第2の態様では、通常TTI用のPFを短縮TTIに利用する場合について説明する。第2の態様に係るユーザ端末は、通常TTIよりも少ないシンボル数で構成される短縮TTIにおいて、PUCCHを介してUCIを送信する。具体的には、当該ユーザ端末は、通常TTI用のPFの一部を用いて短縮TTIのUCIを送信し、当該短縮TTIを構成する少なくとも一つのシンボルにDMRSをマッピングする。
図5Cを参照して説明したように、短縮TTIが通常スロットと同一のシンボル数(通常CPの場合、7シンボル)で構成される場合、既存のPF1/1a/1b/3でも時間方向の拡散符号の直交性を維持でき、複数のユーザ端末を適切に多重できる。そこで、ユーザ端末は、通常スロットと同一のシンボル数の短縮TTIを設定し、当該短縮TTIにPF1/1a/1b/3を適用する。
図5Bを参照して説明したように、短縮TTIが通常スロットよりも少ないシンボル数(例えば、4シンボル)で構成される場合、既存のPF1/1a/1b/3では、時間方向の拡散符号の直交性を維持できなくなることが想定される。一方で、短縮TTI内のシンボル数に応じた系列長の直交拡散符号を導入すれば、短縮TTIが通常スロットより少ないシンボル数で構成される場合でも、時間方向の拡散符号の直交性を維持できる。
図6B及び6Cを参照して説明したように、既存のPF2/2a/2b/4/5を短縮TTIに適用する場合、短縮TTI内の情報シンボル数に応じてペイロードが変更される。一方、PF1/1a/1b/3のように時間方向の直交性の問題は生じないため、PF2/2a/2b/4/5は、通常スロットと同一のシンボル数の短縮TTIと、通常スロットとは異なるシンボル数の短縮TTIとの双方に適用可能である。
第3の態様では、短縮TTIでPUCCHを送信する条件について説明する。なお、第3の態様は、第1及び第2の態様のいずれに組み合わせられてもよい。第3の態様において、ユーザ端末は、例えば、以下の条件(1)-(3)のいずれかにより、短縮TTIでのPUCCH送信を行うことを決定してもよい。
以下、本発明の一実施の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、上記各態様に係る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、それぞれ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20は、本実施の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22は、本実施の形態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。
なお、上記実施の形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的に結合した1つの装置により実現されてもよいし、物理的に分離した2つ以上の装置を有線又は無線で接続し、これら複数の装置により実現されてもよい。
Claims (10)
- 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIにおいて、上り制御チャネルを介して上り制御情報を送信する送信部と、
前記上り制御情報の送信を制御する制御部と、を具備し、
前記制御部は、前記第2TTI内のスロット間で周波数ホッピングするリソースブロックで前記上り制御情報を送信し、前記スロットを構成する少なくとも一つのシンボルに復調用参照信号をマッピングすることを特徴とするユーザ端末。 - 前記制御部は、前記上り制御情報をマッピングするシンボルのサブキャリア間において、巡回シフト(CS)による拡散を適用することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、前記上り制御情報をマッピングする前記スロット内の複数のシンボル間において、直交拡散符号による時間及び/又は周波数拡散を適用す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。
- 複数の第2TTIで同一のシンボルが共用される場合、前記制御部は、前記複数の第2TTIそれぞれの復調用参照信号を、Comb又は巡回シフトを用いて、前記同一のシンボルに多重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。
- 複数の第2TTIで同一のシンボルが共用される場合、前記制御部は、前記複数の第2TTIそれぞれの上り制御情報を、Combを用いて、前記同一のシンボルに多重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。
- 前記制御部は、スロットあたり複数のリソースブロックを用いて前記上り制御情報を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。
- 前記制御部は、前記第1TTIの最終シンボルでサウンディング参照信号(SRS)が送信される場合、前記最終シンボルを含む第2TTIに、前記最終シンボルを省くフォーマットを適用することを特徴とする請求項1から請求項6のいずれかに記載のユーザ端末。
- 前記制御部は、前記第2TTI内のスロット間で周波数ホッピングするリソースブロックを、前記スロットの番号に基づいて決定することを特徴とする請求項1から請求項7のいずれかに記載のユーザ端末。
- 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIにおいて、上り制御チャネルを介して上り制御情報を受信する受信部と、
前記上り制御情報の受信を制御する制御部と、を具備し、
前記制御部は、前記第2TTI内のスロット間で周波数ホッピングするリソースブロックで送信される前記上り制御情報を、前記スロットを構成する少なくとも一つのシンボルにマッピングされる復調用参照信号を用いて復調することを特徴とする無線基地局。 - 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIを用いた無線通信方法であって、ユーザ端末において、
前記第2TTI内のスロット間で周波数ホッピングするリソースブロックで、上り制御チャネルを介して上り制御情報を送信する工程と、
前記スロットを構成する少なくとも一つのシンボルに復調用参照信号をマッピングする工程と、を有することを特徴とする無線通信方法。
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