WO2018030416A1 - ユーザ端末及び無線通信方法 - Google Patents
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- WO2018030416A1 WO2018030416A1 PCT/JP2017/028800 JP2017028800W WO2018030416A1 WO 2018030416 A1 WO2018030416 A1 WO 2018030416A1 JP 2017028800 W JP2017028800 W JP 2017028800W WO 2018030416 A1 WO2018030416 A1 WO 2018030416A1
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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
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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
- H04L27/2647—Arrangements specific to the receiver only
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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
- 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
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
Definitions
- the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- Non-Patent Document 1 LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT) and LTE Rel.14, 15 ⁇ ) are also being considered.
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC Dual Connectivity
- CG Cell Group
- CC Carrier
- Inter-eNB CA inter-base station CA
- a transmission time interval (TTI: Transmission Time Interval) (also referred to as a subframe) is used, and a downlink (DL: Downlink) and / or Uplink (UL) communication is performed.
- TTI Transmission Time Interval
- DL Downlink
- UL Uplink
- the 1 ms TTI is a transmission time unit of one channel-encoded data packet, and is a processing unit such as scheduling, link adaptation, and retransmission control (HARQ-ACK: Hybrid Automatic Repeat reQuest-Acknowledge).
- HARQ-ACK Hybrid Automatic Repeat reQuest-Acknowledge
- eMBB enhanced Mobile Broad Band
- IoT Internet of Things
- MTC Machine Type Communication
- URLLC Ultra-reliable and low latency communication
- the number of symbols (for example, fewer than the UL control channel (for example, PUCCH (Physical Uplink Control Channel) format 1 to 5) in the existing LTE system) Support for UL control channels consisting of 1 or 2 symbols) is under consideration.
- the UL control channel for example, PUCCH (Physical Uplink Control Channel) format 1 to 5
- PUCCH Physical Uplink Control Channel
- the present invention has been made in view of the above points, and provides a user terminal and a wireless communication method capable of transmitting uplink control information (UCI) using a UL control channel suitable for a required condition in a future wireless communication system.
- UCI uplink control information
- One of the purposes is to do.
- One aspect of the user terminal includes a transmission unit that transmits uplink control information (UCI) using an uplink (UL) control channel, and a control unit that controls transmission of the UCI.
- the configuration of the UL control channel is selected from a plurality of configurations having different numbers of symbols.
- uplink control information (UCI) using a UL control channel suitable for user terminal requirements in a future wireless communication system.
- FIG. 2A and 2B are diagrams illustrating another example of a frame configuration used in a future wireless communication system.
- 3A and 3B are diagrams illustrating an example of the configuration of the UL control channel.
- 4A to 4C are diagrams illustrating an example of the configuration of the UL control channel in consideration of UL coverage.
- 5A to 5C are diagrams illustrating an example of a configuration of a UL control channel of a future wireless communication system.
- 6A and 6B are diagrams illustrating an example of a plurality of UL control channel configurations according to the present embodiment.
- 7A and 7B are diagrams illustrating an example of a first UL control channel region according to the present embodiment.
- 8A and 8B are diagrams illustrating a multiplexing example of UCI in the first UL control channel region according to the present embodiment. It is a figure which shows the multiplexing example of the reference signal in the 1st UL control channel area
- 10A and 10B are diagrams illustrating an example of the second UL control channel region according to the present embodiment.
- 11A and 11B are diagrams illustrating a multiplexing example of UCI in the second UL control channel region according to the present embodiment.
- 12A and 12B are diagrams illustrating an example of multiplexing of reference signals in the second UL control channel region according to the present embodiment.
- 13A and 13B are diagrams illustrating another example of multiplexing reference signals in the second / third UL control channel region according to the present embodiment.
- 14A and 14B are diagrams showing still another example of multiplexing reference signals in the second / third UL control channel region according to the present embodiment.
- multiple frame configurations also called frame structure, frame type, channel configuration, subframe configuration, subframe type, subframe structure, slot configuration, slot type, slot structure
- frame structure also called frame structure, frame type, channel configuration, subframe configuration, subframe type, subframe structure, slot configuration, slot type, slot structure
- FIG. 1 is a diagram illustrating an example of a frame configuration (here, a time configuration) used in a future wireless communication system. Note that the frame configuration illustrated in FIG. 1 is an example, and the specific configuration, number, and the like of the frame configuration applicable in the present embodiment are not limited to those illustrated in FIG.
- FIG. 1 shows an example in which different channels are divided in the time domain, but the frame configuration is not limited to this.
- a DL data channel also referred to as a DL shared channel
- a DL control channel are not necessarily divided in time, and may be frequency / code multiplexed in the same time interval (for example, symbol).
- the UL data channel also referred to as a UL shared channel
- the UL control channel are the same, and need not necessarily be divided in time, and may be frequency / code multiplexed in the same time interval (for example, symbol). .
- a frame configuration (also referred to as DL centric or the like) in which a DL control channel, a DL data channel, and a UL control channel are arranged can be used.
- the user terminal controls reception of the DL data channel based on downlink control information (DCI: Downlink Control Information) transmitted on the DL control channel.
- DCI Downlink Control Information
- the user terminal transmits retransmission control information (HARQ-ACK: Hybrid Automatic Repeat reQuest-Acknowledge, ACK or NACK (ACK / NACK), etc.) of the DL data channel in the same time interval (eg, NR TDD subframe, or Alternatively, feedback may be performed using a UL control channel at a transmission time interval (TTI: Transmission Time Interval). Note that the user terminal can also feed back the HARQ-ACK through the UL control channel or the UL data channel in the subsequent time interval.
- HARQ-ACK Hybrid Automatic Repeat reQuest-Acknowledge, ACK or NACK (ACK / NACK), etc.
- TTI Transmission Time Interval
- a switching time (gap interval) between DL and UL is set between the DL data channel and the UL control channel and / or between the DL control channel and the UL data channel. May be. Also, the switching time (gap interval) between UL and DL may be set between the UL control channel and the start time of the next frame (subframe or TTI).
- the gap interval between the DL data channel and the UL control channel and / or the DL control channel and the UL data channel in FIG. 1 is the number of integer symbols such as 1 symbol, 2 symbols, and 3 symbols, for example. It can be.
- assignment that completes transmission / reception control may be performed within the same subframe.
- This assignment is also referred to as self-contained assignment.
- a subframe in which self-contained assignment is performed may be referred to as a self-contained subframe.
- the self-contained subframe may be referred to as, for example, a self-contained TTI, a self-contained symbol set, or other names may be used.
- the user terminal may receive the DL data channel based on the DL control channel and transmit the HARQ-ACK of the DL data channel.
- a self-contained subframe for example, feedback with an ultra-low delay of 1 ms or less can be realized, so that the delay time can be reduced.
- a frame configuration (also referred to as UL centric) in which the DL control channel, the UL data channel, and the UL control channel are arranged can be used.
- the user terminal can transmit UL signals (UL data, measurement reports, etc.) in the same (or subsequent) subframes based on DCI transmitted on the DL control channel.
- the channel arrangement order and the length in the time direction are not limited to the configuration shown in FIG.
- the position of each channel can be changed and applied as appropriate.
- the arrangement area of the control channel may be changed, or the length of the gap section may be changed.
- FIG. 2 is a diagram illustrating another example of a frame configuration used in a future wireless communication system.
- FIG. 2A shows a frame configuration when the arrangement area of the DL control channel and the UL control channel is expanded.
- the arrangement area of the DL control channel it is possible to increase the capacity of DCI that can be transmitted in one time interval (for example, subframe, TTI).
- the UL control channel allocation time for example, the number of symbols
- the required quality can be achieved when transmitting an uplink control signal having a predetermined number of bits even in uplinks with limited transmission power. Becomes easy.
- FIG. 2B shows a frame configuration when the gap section is enlarged.
- a future wireless communication system (5G / NR), it is considered to introduce a frame configuration in which a time interval for DL transmission and a time interval for UL transmission are set in a predetermined time interval (for example, subframe). Has been.
- the UL control channel (PUCCH format 1 to 5) of the existing LTE system is transmitted by all symbols in the subframe (for example, 14 symbols in the case of normal cyclic prefix (CP)).
- FIG. 3 is a diagram showing an example of the configuration of the UL control channel.
- the UL control channel (PUCCH formats 1 to 3, 5) of the existing LTE system is one resource block (RB, PRB) that is frequency-hopped between slots over all symbols in the subframe. : It is also mapped to Physical Resource Block.
- the UL control channel is transmitted in the last symbol of the subframe.
- the UL coverage (hereinafter referred to as UL).
- UL the UL coverage
- coverage it is assumed that the number of symbols to which the UL control channel is mapped is increased in the subframe.
- the power density of the transmission signal can be increased, so that wider coverage can be achieved.
- FIG. 4 is a diagram illustrating a configuration example of a UL control channel in consideration of UL coverage.
- the UL control channel is arranged in the last symbol of each subframe.
- the UL control channel may be arranged from the last symbol of each subframe to a plurality of symbols.
- the number of symbols arranged in the UL control channel is increased in each subframe, the number of symbols arranged in the UL data channel (which may be a DL data channel) in the subframe is reduced. Efficiency (spectral efficiency) may be reduced. Therefore, as shown in FIG. 4C, it is assumed that the UL control channel is not arranged in each subframe, but is arranged in a subframe of a predetermined period (for example, 5 subframe periods).
- the frequency utilization efficiency increases as the number of symbols arranged in the data channel (UL data channel or DL data channel) decreases by decreasing the frequency of the subframe in which the number of symbols arranged in the UL control channel is increased. Can be prevented from decreasing.
- the configuration illustrated in FIG. 4C is also suitable for a case where retransmission control information of a plurality of subframes is collectively fed back (Multi-TTI HARQ-ACK feedback).
- FIG. 5 is a diagram illustrating an example of a configuration of a UL control channel of a future wireless communication system.
- a configuration in which the number of symbols arranged in the UL control channel is reduced for example, UL control channel is 1 or 2 symbols. Is preferable.
- the number of PRBs in which the UL control channel is arranged is preferably a minimum number.
- UL control channels arranged over a plurality of symbols are arranged in a specific PRB (for example, 1 PRB per symbol), and data channels (UL data channel in FIG. 5C) are mapped to the remaining PRBs. Is done.
- frequency hopping is applied between a plurality of symbols in which the UL control channel is arranged.
- the present inventors can transmit a UCI using a UL control channel suitable for user terminal requirements by supporting a configuration of a plurality of UL control channels (for example, a plurality of configurations having different numbers of symbols).
- a configuration of a plurality of UL control channels for example, a plurality of configurations having different numbers of symbols.
- the neurology is communication parameters in the frequency direction and / or the time direction (for example, subcarrier interval, bandwidth, symbol length, CP length, TTI length, number of symbols per TTI, radio frame configuration, filtering processing) , At least one of windowing processing and the like).
- a user terminal transmits uplink control information (UCI) using an uplink (UL) control channel, and controls transmission of the UCI.
- the UCI may include at least one of DL data channel retransmission control information (also referred to as HARQ-ACK, ACK / NACK, etc.), channel state information (CSI), and scheduling request (SR).
- the user terminal selects a UL control channel configuration used for UCI transmission from a plurality of UL control channel configurations having different numbers of symbols.
- the UL control channel configuration defines a configuration necessary for at least one of UL control channel generation processing, transmission processing, and reception processing. For example, the number of symbols, symbol positions, and frequencies in which the UL control channel is arranged.
- the number of resource units for example, PRB
- the UL control channel configuration may be referred to as a format, a UL control channel format, a PUCCH format, or the like.
- a plurality of UL control channel configurations that can be used for UCI transmission are defined.
- the plurality of UL control channel configurations include at least two UL control channel configurations having different numbers of symbols.
- the plurality of UL control channel configurations may include at least two UL control channel configurations having the same number of symbols.
- the plurality of UL channel configurations are configured with a first UL control channel configuration configured with a predetermined number of symbols from the end of the subframe, and with a greater number of symbols than the first UL control channel configuration.
- the plurality of UL control channel configurations may include a third UL control channel configuration configured with a larger number of symbols than the first UL control channel configuration.
- the last symbol in the subframe is the last symbol in the time domain that can be used by the user terminal, and is not necessarily the last symbol in time in the subframe.
- the last symbol of a subframe may not be the last symbol in time (for example, Or the second symbol from the end).
- the number of symbols in the second UL control channel configuration and the number of symbols in the third UL control channel configuration may be the same or different, and the number of symbols in the first UL control channel configuration. More than that.
- the two are not distinguished from each other, they are collectively referred to as a second / third UL control channel configuration.
- FIG. 6 is a diagram showing an example of a plurality of UL control channel configurations according to the present embodiment.
- a DL control channel is arranged in the first symbol of a subframe is described as an example, but the DL control channel may not be arranged.
- the first UL control channel configuration includes a predetermined number of symbols (for example, one symbol in FIG. 6A) from the end of the subframe.
- the first UL control channel configuration includes one or more PRBs (for example, 17 PRBs in FIG. 6A) in the predetermined number of symbols.
- frequency hopping for each predetermined number of symbols may be applied.
- the second / third UL control channel configuration includes a predetermined number of symbols (for example, 4 symbols or more, 12 symbols in FIG. 6A) more than the first UL control channel. Consists of. Further, the second / third UL control channel configuration has one or more PRBs in the predetermined number of symbols (for example, in FIG. 6A, 1 PRB may be smaller than the number of PRBs in the first UL control channel configuration). It is comprised including. Further, in the second / third UL control channel configuration, frequency hopping for each predetermined number of symbols (for example, 6 symbols in FIG. 6A) may be applied.
- the data channel (UL data channel or DL data channel) and the UL control channel can be at least time division multiplexed (TDM).
- TDM time division multiplexed
- FDM frequency division multiplexed
- a gap interval of an integer multiple of the symbol length (for example, 1 symbol length in FIG. 6A) is provided between the DL control channel and the UL data channel.
- the gap section is a switching time from DL to UL in the user terminal.
- no gap section is provided between the UL control channel and the start time of the next subframe (also referred to as a frame or TTI) (the gap section is set to 0).
- time division duplex Time Division Duplex, frame structure type 2, type 2, etc.
- switching from UL to DL is performed by timing advance (TA: Timing Advance) for UL synchronization.
- TA Timing Advance
- FDD Frequency Division Duplex, also referred to as frame structure type 1, type 1, etc.
- the first UL control channel configuration has a predetermined number of timings starting from the end of the subframe by the gap interval. It is composed of a symbol length (1 symbol length in FIG. 6B).
- the second / third UL control channel configuration is configured with a predetermined number of symbol lengths (12 symbol lengths in FIG. 6B), starting from a timing that is back by the gap interval from the end of the subframe.
- FIG. 6B by explicitly indicating the switching time from DL to UL and the switching time from UL to DL as gap sections, it is possible to eliminate the adjustment of the timing advance setting time in actual operation.
- FIG. 6A the UL control channel configuration in the case where the switching time from UL to DL is not clearly described (FIG. 6A) will be described. This can also be applied as appropriate to the case where the switching time is clearly specified (FIG. 6B).
- different PRBs are allocated to the first UL control channel configuration and the second / third UL control channel configuration, but overlapping PRBs may be allocated.
- the UL control channel having the first UL control channel configuration may be mapped in the overlapping PRB, and the second / third UL control channel may not be mapped.
- the UL control channel having the second / third UL control channel configuration may be mapped, and the UL control channel having the first UL control channel configuration may not be mapped.
- a plurality of UL control channel configurations are supported. For this reason, for example, a user terminal with a high request for delay requests selects the first UL control channel configuration with a small number of symbols, and a user terminal with a high demand for throughput has a higher demand than the first UL control channel configuration.
- a second / third UL control channel configuration with a large number of symbols may be selected.
- the first to third UL control channel configurations according to the present embodiment will be described in detail.
- the gap period as the switching time from UL to DL is not clearly shown.
- the first to third UL control channel configurations of the present embodiment are also appropriate when clearly indicating the gap period as the switching time from DL to UL and the switching time from UL to DL (see FIG. 6B). Applicable.
- a resource region (first UL control channel region) that is a candidate for arranging a UL control channel having the first UL control channel configuration is set to a predetermined number of symbols from the end of the subframe over a predetermined number of PRBs. Is done.
- FIG. 7 is a diagram illustrating an example of a first UL control channel region according to the present embodiment.
- the first UL control channel region may be composed of the last one symbol of the subframe as shown in FIG. 7A, or may be composed of the last two symbols of the subframe as shown in FIG. 7B.
- Good. 7A and 7B are merely examples, and the present invention is not limited to this.
- the first UL control channel region may be composed of the last three or more symbols of the subframe.
- the first UL control channel region is set to at least a part of a frequency band (for example, a system band or a data channel allocation region) that can be used by the user terminal.
- a frequency band for example, a system band or a data channel allocation region
- the first UL control channel region is higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling) or broadcast information (for example, MIB: Master Information Block and / or Or, it may be set to semi-static by SIB: System Information Block, may be set to dynamic by physical layer signaling (for example, DL control channel), or these It is set by at least one combination.
- RRC Radio Resource Control
- MAC Medium Access Control
- broadcast information for example, MIB: Master Information Block and / or Or, it may be set to semi-static by SIB: System Information Block, may be set to dynamic by physical layer signaling (for example, DL control channel), or these It is set by at least one combination.
- the user terminal receives information on the first UL control channel region (first UL control channel region information) by at least one of higher layer signaling, broadcast information, and physical layer signaling.
- the first UL control channel region information explicitly indicates the first UL control channel region such as the symbol position of the first UL control channel region, the number of symbols, the assigned PRB, and the assigned PRB number. It may be the information shown.
- the first UL control channel region information implicitly indicates the first UL control channel region, such as at least one of cell identification information (cell ID) and user terminal identification information (UE-ID). Information may be used, and the first UL control channel region may be determined by the user terminal itself.
- cell ID cell identification information
- UE-ID user terminal identification information
- the first UL control channel region may be a resource region common to a plurality of user terminals that perform communication within the same carrier (cell, component carrier (CC)).
- the resource area may be individual for each user terminal.
- the first UL control channel region is common among the plurality of user terminals.
- the UCI of each of the plurality of user terminals is multiplexed by at least one of frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM). That is, the UCI of each user terminal is transmitted using at least one of a time resource, a frequency resource and a code resource, and a frequency hopping pattern in the first UL control channel region.
- FDM frequency division multiplexing
- TDM time division multiplexing
- CDM code division multiplexing
- FIG. 8 is a diagram showing an example of multiplexing of UCI in the first UL control channel region according to the present embodiment.
- 8A and 8B a first UL control channel region common to user terminals (UE) 1 to 4 is shown.
- the time resource in the first UL control channel region is a symbol
- the frequency resource is a symbol
- the code resource is an orthogonal spreading code (for example, OCC: Orthogonal Cover Code).
- OCC Orthogonal Cover Code
- FIG. 8A shows a case where the first UL control channel region is composed of the last one symbol of the subframe.
- 3PRB different from other user terminals is assigned to the UCI of the user terminal 1.
- 2PRB different from other user terminals is allocated to UCI of the user terminal 2.
- the 2CIB that overlaps with the user terminal 4 is assigned to the UCI of the user terminal 3, and an orthogonal spreading code different from that of the user terminal 4 is assigned.
- At least one of a time resource, a frequency resource, and a code resource in the first UL control channel region is allocated to each user terminal as a UCI transmission resource.
- the transmission resource may be explicitly specified by higher layer signaling and / or physical layer signaling.
- information indicating transmission resources of UCI is DCI (for example, DL assignment for assigning DL data channel, or UL grant for assigning UL data channel). May be included.
- the transmission resource may be implicitly determined in the user terminal based on information (for example, UE-ID, subframe number, etc.) that is signaled by higher layer signaling and / or physical layer signaling.
- FIG. 8B shows a case where the first UL control channel region is composed of the last two symbols of the subframe. Also in FIG. 8B, as described in FIG. 8A, UCI transmission resources are allocated to each user terminal within the first UL control channel region.
- frequency hopping may be applied between symbols.
- frequency hopping for each symbol is applied.
- the frequency hopping pattern may be specific to each user terminal (may be determined based on information specific to the user terminal), or may be common to a plurality of user terminals (user terminal). (May be determined based on cell identification information (cell ID), subframe number, etc.).
- the CP-OFDM scheme may be used.
- UCI is modulated and spread in the frequency domain
- a reference signal eg, UCI demodulation reference signal (DM-RS)
- DM-RS UCI demodulation reference signal
- the unit may be UCI and frequency division multiplexed.
- a user terminal encodes a UCI bit string (hereinafter also referred to as UCI bit), modulates the encoded bit string (digital modulation), and then modulates a symbol (hereinafter also referred to as a UCI symbol). ) May be mapped onto orthogonal subcarriers.
- the user terminal may perform encoding after adding a CRC (Cyclic Redundancy Check) bit scrambled with a UE-ID and / or a cell ID to the end of the UCI bit string.
- CRC Cyclic Redundancy Check
- the user terminal may perform rate matching on UCI bits based on the number of subcarriers to which UCI symbols are mapped. Further, the user terminal may apply spreading and / or repetition to the UCI symbol based on the number of subcarriers to which the UCI symbol is mapped.
- the user terminal may perform modulation (digital modulation) on the reference signal and map the modulation symbols on orthogonal subcarriers.
- modulation digital modulation
- the sequence and / or arrangement pattern of the reference signal is explicitly shown by information (for example, at least one of a subcarrier number, a symbol number, and an arrangement pattern index) that is signaled by higher layer signaling and / or physical layer signaling. Or may be determined implicitly based on higher layer signaling and / or physical layer signaled information (eg, UE-ID and / or cell ID).
- FIG. 9 is a diagram illustrating a multiplexing example of reference signals in the first UL control channel region according to the present embodiment.
- each PRB is assumed to be composed of 12 subcarriers, but this is only an example and the present invention is not limited to this.
- the reference signal and the UCI symbol may be frequency division multiplexed on a subcarrier basis. Note that the number and arrangement positions of the reference signals illustrated in FIG. 9 are merely examples, and are not limited thereto.
- the resource region (second UL control channel region) that is a candidate for placing the UL control channel having the second UL control channel configuration is a larger number of symbols (for example, 4 or more) than the first UL control channel region. It is comprised including. Note that the second UL control channel region may be composed of all symbols in a subframe or may be composed of some symbols.
- the second UL control channel region is a predetermined number of both end regions of a frequency band (for example, a system band (also referred to as a cell (CC) bandwidth) or a data channel allocation region) that can be used by the user terminal.
- the PRB may be configured.
- frequency hopping may be applied to the UL control channel by configuring the second UL control channel region to include a plurality of resource regions that are discrete in the frequency direction.
- FIG. 10 is a diagram illustrating an example of the second UL control channel region according to the present embodiment.
- the second UL control channel region may be configured with 1 PRB in both end regions of the frequency band that can be used by the user terminal, or as shown in FIG. 10B, both end regions in the frequency band. 2PRB may be used.
- 10A and 10B are merely examples, and the present invention is not limited to this.
- the second UL control channel region may be composed of three or more PRBs in both end regions of the frequency band.
- the second UL control channel region is composed of a larger number of symbols (here, 12 symbols) than the first UL control channel region from the last symbol of the subframe. May be.
- the second UL control channel region may be composed of all symbols of the subframe.
- the second UL control channel region may be set semi-statically by higher layer signaling (eg, RRC signaling, MAC signaling) or broadcast information (eg, MIB and / or SIB). It may be set dynamically by physical layer signaling (for example, DL control channel), or may be set by a combination of at least one of these.
- higher layer signaling eg, RRC signaling, MAC signaling
- broadcast information eg, MIB and / or SIB
- physical layer signaling for example, DL control channel
- the user terminal receives information on the second UL control channel region (second UL control channel region information) by at least one of higher layer signaling, broadcast information, and physical layer signaling.
- the second UL control channel region information explicitly indicates the second UL control channel region such as, for example, at least one of the symbol position, the number of symbols, the assigned PRB, and the assigned PRB number of the second UL control channel region. It may be the information shown. Alternatively, the second UL control channel region information may be information that implicitly indicates the second UL control channel region, such as at least one of a cell ID and a UE-ID. The UL control channel region may be determined.
- the second UL control channel region may be a resource region common to a plurality of user terminals that perform communication within the same carrier (cell, component carrier (CC)).
- the resource area may be individual for each user terminal.
- the second UL control channel region is common among the plurality of user terminals.
- the UCI of each of the plurality of user terminals is multiplexed by at least one of frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM). That is, the UCI of each user terminal is transmitted using at least one of a time resource, a frequency resource, and a code resource in the second UL control channel region.
- FDM frequency division multiplexing
- TDM time division multiplexing
- CDM code division multiplexing
- FIG. 11 is a diagram showing a multiplexing example of UCI in the second UL control channel region according to the present embodiment.
- a second UL control channel region common to user terminals (UE) 1 to 4 is shown.
- the time resource in the first UL control channel region is a symbol
- the frequency resource is a symbol
- the code resource is an orthogonal code (for example, OCC). Not limited.
- FIG. 11A shows a case where the second UL control channel region is configured with 1 PRB at both ends of the frequency band that can be used by the user terminal 1-4.
- the same 1 PRB as the other user terminals is assigned to the UCI of the user terminal 1, and a frequency hopping pattern different from that of the other user terminals is applied.
- the same frequency hopping pattern as the same 1PRB is applied to the user terminals 2 and 3, but different orthogonal codes are assigned.
- At least one of a time resource, a frequency resource, a code resource, and a frequency hopping pattern in the second UL control channel region is assigned to each user terminal as a UCI transmission resource.
- the transmission resource may be explicitly indicated by information that is upper layer signaling and / or physical layer signaling.
- information indicating transmission resources of UCI may be included in DCI (eg, DL assignment or UL grant).
- DCI eg, DL assignment or UL grant.
- the transmission resource may be implicitly determined in the user terminal based on information (for example, UE-ID, subframe number, etc.) that is signaled by higher layer signaling and / or physical layer signaling.
- FIG. 11B shows a case where the second UL control channel region is composed of 2PRBs at both ends of the frequency band that can be used by the user terminal 1-4. Also in FIG. 11B, as described in FIG. 11A, UCI transmission resources are allocated to each user terminal within the second UL control channel region.
- UCIs of different user terminals may be multiplexed for each PRB, and the same user terminal among the plurality of PRBs
- the UCI of the user terminal 4 in FIG. 11B may be multiplexed.
- frequency hopping is applied every predetermined number of symbols (six symbols in this case) constituting the second UL control channel region.
- the frequency hopping pattern may be specific to each user terminal (may be determined based on information specific to the user terminal), or may be common to a plurality of user terminals (user terminal). (It may be determined based on information common to each cell (for example, cell ID, subframe number, etc.)).
- the DFT-S-OFDM scheme may be used for UCI transmission in the second UL control channel region as described above.
- UCI is modulated and spread in the time domain
- a reference signal eg, UCI demodulation reference signal (DM-RS)
- DM-RS UCI demodulation reference signal
- a user terminal encodes and spreads UCI bits, modulates (encodes) the encoded and spread bit string, and performs spreading for each block (grouping for each block). May be performed.
- the user terminal may perform encoding after adding a CRC bit scrambled with a UE-ID or a cell ID to the end of the UCI bit string.
- the user terminal may perform rate matching on UCI bits based on the number of subcarriers that transmit UCI. Also, the user terminal may apply spreading and / or repetition to UCI modulation symbols (UCI symbols) based on the number of subcarriers transmitting UCI.
- UCI symbols UCI modulation symbols
- the user terminal may generate a reference signal using a predetermined method (for example, CAZAC (Constant Amplitude Zero Auto-Correlation) sequence or OFDM method), and time-multiplex the generated reference signal and the UCI symbol.
- a predetermined method for example, CAZAC (Constant Amplitude Zero Auto-Correlation) sequence or OFDM method
- the arrangement pattern of the reference signal may be explicitly indicated by information (for example, at least one of a subcarrier number, a symbol number, and an arrangement pattern index) that is signaled by higher layer signaling and / or physical layer signaling.
- information for example, at least one of a subcarrier number, a symbol number, and an arrangement pattern index
- it may be determined implicitly based on information (for example, UE-ID and / or cell ID) that is signaled by higher layer signaling and / or physical layer signaling.
- FIG. 12 is a diagram showing an example of multiplexing reference signals in the second UL control channel region according to the present embodiment. As shown in FIGS. 12A and 12B, in each PRB allocated to the user terminal in the second UL control channel region, the reference signal and the UCI may be time-division multiplexed on a symbol basis.
- the resource region (third UL control channel region) that is a candidate for arranging the UL control channel having the third UL control channel configuration has a larger number of symbols (for example, 4 or more) than the first UL control channel region. It is comprised including. Note that the third UL control channel region may be composed of all symbols in a subframe, or may be composed of some symbols. The third UL control channel region may have the same or different number of symbols as the second UL control channel region.
- the third UL control channel region is configured in the same manner as the second UL control channel region (for example, as shown in FIGS. 10A and 10B).
- the third UL control channel region may be set semi-statically by higher layer signaling (eg, RRC signaling, MAC signaling) or broadcast information (eg, MIB and / or SIB), or physical layer signaling (eg, , DL control channel) or a combination of at least one of these.
- the third UL control channel region may be common to a plurality of user terminals or may be specific to the plurality of user terminals.
- each user terminal has a third transmission resource as a UCI transmission resource. At least one of a time resource, a frequency resource, a code resource, and a frequency hopping pattern in the UL control channel region is allocated.
- the transmission resource may be explicitly indicated by information that is upper layer signaling and / or physical layer signaling. Alternatively, the transmission resource may be implicitly determined in the user terminal based on information that is upper layer signaling and / or physical layer signaling.
- the PRBs constituting the second and third UL control channel regions are different from each other.
- a CAZAC sequence is used for UCI transmission instead of the DFT-S-OFDM method used in the second UL control channel region.
- the user terminal encodes UCI bits, modulates the encoded bits with a predetermined modulation scheme (for example, BPSK or QPSK), and code-spreads the modulated UCI symbols in the frequency direction using a CAZAC sequence. May be transmitted.
- a predetermined modulation scheme for example, BPSK or QPSK
- the CAZAC sequence corresponds to the number of PRBs (number of subcarriers) of each symbol, and the sequence length of the CAZAC sequence is the number of subcarriers in the PRB assigned to UCI (for example, 12 in FIG. 12A). equal.
- the user terminal may code spread the UCI symbol in the time direction using an orthogonal spreading code (for example, a Walsh code) and transmit it.
- the code length of the orthogonal spreading code may be equal to the number of symbols to which the reference signal is not mapped among the number of symbols constituting the third UL control channel region. For example, when frequency hopping every 6 symbols is applied in the third UL control channel region and a reference signal is mapped to 2 symbols per the same PRB (see FIGS. 12A and 12B), the sequence length of the orthogonal spreading code is 4 It may be.
- the user terminal may generate a reference signal using a predetermined method (for example, CAZAC sequence or OFDM method), and time-multiplex the generated reference signal and UCI symbol (for example, see FIG. 12).
- a predetermined method for example, CAZAC sequence or OFDM method
- time-multiplex the generated reference signal and UCI symbol for example, see FIG. 12
- the arrangement pattern of the reference signal may be explicitly indicated by information (for example, at least one of a subcarrier number, a symbol number, and an arrangement pattern index) that is signaled by higher layer signaling and / or physical layer signaling.
- information for example, at least one of a subcarrier number, a symbol number, and an arrangement pattern index
- it may be determined implicitly based on information (for example, UE-ID and / or cell ID) that is signaled by higher layer signaling and / or physical layer signaling.
- the user terminal selects a UL control channel configuration used for UCI transmission from a plurality of UL control channel configurations (for example, first to third UL control channel configurations).
- the user terminal selects the UL control channel configuration based on the instruction information from the radio base station. For example, on the basis of the instruction information, the user terminal can determine the UCI from a plurality of UL control channel configurations (for example, a first UL control channel configuration and a second / third UL control channel configuration) having different numbers of symbols.
- the UL control channel configuration used for transmission may be selected.
- the UCI to be transmitted may be changed based on the UL control channel configuration to be transmitted. For example, when transmitting UCI in the first UL control channel configuration in the nth subframe, retransmission control information (ACK / NACK) for the DL data channel allocated to the nx (x is 0 or more) subframe is sent. When transmitting UCI including the UCI in the 2/3 UL control channel configuration in the nth subframe, retransmission control information for the DL data channel assigned to the nx (x is 0 or more) subframe A UCI that does not include (ACK / NACK) may be transmitted.
- ACK / NACK retransmission control information
- the instruction information may be 1-bit information indicating whether or not to use the first UL control channel configuration, or information that explicitly indicates the UL control channel configuration used for UCI transmission (for example, UL control). It may be a channel configuration number (index) or the like.
- the setting information may be transmitted by at least one of higher layer signaling, broadcast information, and physical layer signaling. For example, when the instruction information is transmitted by higher layer signaling and / or broadcast information, selection between a plurality of UL control channel configurations having different numbers of symbols can be performed semi-statically.
- the user terminal when a specific UL control channel configuration is not set (before setting) such as an initial access procedure, the user terminal has the second / third symbols having a larger number of symbols than the first UL control channel configuration.
- the UL control channel configuration may be selected. Thereby, UL coverage in an initial access procedure or the like can be ensured.
- the user terminal when a specific UL control channel is not set (before setting), such as in an initial access procedure, the user terminal has the first number of symbols smaller than that of the second / third UL control channel configuration.
- the UL control channel configuration may be selected. As a result, the UL overhead in the initial access procedure can be minimized.
- the user terminal is used for UCI transmission from a plurality of UL control channel configurations (for example, the second UL control channel configuration and the third UL control channel configuration) having a larger number of symbols than the first UL control channel configuration.
- the UL control channel configuration can also be selected.
- the user terminal may perform selection among the plurality of UL control channel configurations based on the number of UCI bits (payload).
- the user terminal selects the second UL control channel configuration, and when the number of UCI bits is less than the predetermined value, It may be decided to use the UL control channel configuration.
- a predetermined value for example, 3 bits
- the user terminal may selectively drop the UCI according to the type or priority so that the UCI to be transmitted fits in a predetermined payload according to the UL control channel configuration to be transmitted.
- the number of UCI bits is equal to or greater than a predetermined value (for example, 22 bits) and the user terminal is instructed to transmit UCI in the second UL control channel configuration
- the number of UCI bits is set to a predetermined value (for example, The UCI type / type / index with a low priority is dropped so that it falls within (22 bits), and the UCI within a predetermined value (for example, 22 bits) obtained thereby is transmitted using the designated second UL control channel configuration. It is good.
- the user terminal may include the identification information of the UCI in the UCI.
- the identification information includes identification information of a user terminal that transmits the UCI (for example, HARQ-ACK), information indicating that the UCI is a HARQ-ACK for which DL data channel of which cell of which subframe (for example, At least one of a subframe number, a cell (CC) index, etc.) may be included.
- the user terminal when transmitting a UCI (for example, HARQ-ACK) using the third UL control channel configuration, the user terminal has a predetermined timing that is uniquely determined (for example, the most recent 4 subframes before and 4 subframes before The HARQ-ACK for the DL data channel of (subframe) may be transmitted as UCI. Thereby, retransmission control by synchronous HARQ can be performed appropriately.
- a UCI for example, HARQ-ACK
- the third UL control channel configuration the user terminal has a predetermined timing that is uniquely determined (for example, the most recent 4 subframes before and 4 subframes before
- the HARQ-ACK for the DL data channel of (subframe) may be transmitted as UCI.
- a plurality of UL control channel configurations (for example, a plurality of UL control channel configurations having different numbers of symbols) are supported. For this reason, for example, a user terminal with a strict request for delay reduction and / or a request with respect to throughput selects the first UL control channel configuration with a relatively small number of symbols, and a user terminal with a strict requirement for coverage has The second / third UL control channel configuration having a larger number of symbols than the first UL control channel configuration can be selected. Therefore, the user terminal can transmit uplink control information (UCI) using a UL control channel suitable for the required conditions.
- UCI uplink control information
- the second / third UL control channel region may be configured to include all symbols of the subframe.
- the second / third UL control channel configuration configured to include all symbols of the subframe
- the second / third UL control channel configuration configured to include a part of the symbols of the subframe and the reference signal May be made common (FIG. 13) or may not be made common (FIG. 14).
- the arrangement of the reference signals in the second / third UL control channel configuration may be common (fixed) regardless of the number of symbols used in the second / third UL control channel configuration, It may be changed according to the number of symbols.
- FIG. 13 is a diagram showing an example of common arrangement of reference signals according to the present embodiment.
- the second / third UL control channel region is configured to include all symbols of the subframe.
- the reference signal is arranged in the same symbol as the second / third UL control channel region shown in FIGS. 12A and 12B. That is, the reference signal is arranged in the same symbol regardless of the number of symbols constituting the second / third UL control channel region.
- inter-cell interference is achieved by fixing the number and / or position of symbols for arranging reference signals regardless of the number of symbols constituting the second / third UL control channel region. Can be easily randomized.
- FIG. 14 is a diagram showing an example of different arrangements of reference signals according to the present embodiment.
- the second / third UL control channel region is configured to include all symbols of the subframe.
- the reference signals are arranged in symbols different from at least one of the second / third UL control channel regions shown in FIGS. 12A and 12B. .
- reference signals are arranged at symbols 3, 6, 9, and 12.
- reference signals are arranged in symbols 1, 2, 5, 6, 9, and 12.
- 14A and 14B are partially overlapped with reference symbol placement symbols in FIGS. 12A and 12B, but reference signals are also placed in symbols that are not overlapped.
- the number of symbols in which the reference signal is arranged may be changed according to the number of symbols constituting the second / third UL control channel region.
- the reference can be made by adaptively controlling the number and / or position of symbols in which the reference signal is arranged according to the number of symbols constituting the second / third UL control channel region. The channel estimation accuracy using the signal can be improved.
- 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. 15 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. can do.
- the wireless communication system 1 is called SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Radio Access Technology), etc. Also good.
- a radio communication system 1 shown in FIG. 15 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. .
- 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, two or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells.
- CC cells
- the user terminal 20 can perform communication using time division duplex (TDD) or frequency division duplex (FDD) in each cell.
- TDD time division duplex
- FDD frequency division duplex
- the TDD cell and the FDD cell may be referred to as a TDD carrier (frame configuration type 2), an FDD carrier (frame configuration type 1), and the like, respectively.
- each cell (carrier) a single neurology may be applied, or a plurality of different neurology may be applied.
- 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 wide bandwidth in a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.
- the same carrier as that between the base station 11 and the base station 11 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. Further, the user terminal 20 can perform inter-terminal communication (D2D) with other user terminals 20.
- D2D inter-terminal communication
- 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 UL.
- a DL shared channel (PDSCH: Physical Downlink Shared Channel, also referred to as DL data channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- L1 / L2 control channels include DL control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. .
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH.
- HARQ retransmission indication information (ACK / NACK) for PUSCH can be transmitted by at least one of PHICH, PDCCH, and EPDCCH.
- a UL shared channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL data channel) shared by each user terminal 20, a UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used.
- PUSCH Physical Uplink Shared 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 (UCI) including at least one of retransmission control information (A / N), channel state information (CSI), and the like of a DL signal is transmitted by PUSCH or PUCCH.
- the PRACH can transmit a random access preamble for establishing a connection with a cell.
- FIG. 16 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 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 UL signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction on UL data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.
- CPRI Common Public Radio Interface
- X2 interface also good.
- the transmission / reception unit 103 transmits a DL signal (including at least one of a DL data signal, a DL control signal, and a DL reference signal) to the plurality of user terminals 20 having different nuemologies, and the plurality of user terminals 20 receives a UL signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal).
- a DL signal including at least one of a DL data signal, a DL control signal, and a DL reference signal
- a UL signal including at least one of a UL data signal, a UL control signal, and a UL reference signal.
- the transmission / reception unit 103 receives UCI from the user terminal 20 using a UL data channel (for example, PUSCH) or a UL control channel (for example, PUCCH).
- the UCI includes at least one of HARQ-ACK, CSI, and SR of a DL data channel (for example, PDSCH).
- the transmission / reception unit 103 includes information (for example, first to third UL control channel region information) and / or UL control channel configuration information regarding resource regions that are candidates for the UL control channel configuration of each UL control channel configuration. Instruction information used for selection may be transmitted.
- FIG. 17 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 17 mainly shows functional blocks of characteristic portions in the present embodiment, and the radio base station 10 also has other functional blocks necessary for radio communication. As illustrated in FIG. 17, the baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
- the control unit 301 controls the entire radio base station 10.
- the control unit 301 includes, for example, DL signal generation by the transmission signal generation unit 302, DL signal mapping by the mapping unit 303, UL signal reception processing (for example, demodulation) by the reception signal processing unit 304, and measurement unit 305. Control the measurement.
- control unit 301 schedules the user terminal 20. Specifically, the control unit 301 may perform scheduling and / or retransmission control of the DL data channel and / or UL data channel based on the UCI from the user terminal 20.
- control unit 301 selects a UL control channel configuration used for UCI transmission from the user terminal 20 from among a plurality of UL control channel configurations, and transmits instruction information indicating the selected UL control channel configuration. You may control to.
- the plurality of UL control channel configurations include the first UL control channel configuration and the second / third UL control channel configuration described above.
- the control unit 301 sets resource regions (for example, first to third UL control channel regions) that are candidates for the UL control channel configuration of each UL control channel configuration, and sets information on the resource region (for example, the first UL control channel region).
- the first to third UL control channel region information may be transmitted.
- the control unit 301 may control the reception signal processing unit 304 so as to perform reception processing of UCI from the user terminal 20 based on each UL control channel configuration.
- the control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates a DL signal (including a DL data signal, a DL control signal, and a DL reference signal) based on an instruction from the control unit 301, and outputs the DL signal to the mapping unit 303.
- the transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs the DL signal to the transmission / reception unit 103.
- the mapping unit 303 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 UL signals (for example, including UL data signals, UL control signals, and UL reference signals) transmitted from the user terminal 20. I do. Specifically, the reception signal processing unit 304 may output a reception signal or a signal after reception processing to the measurement unit 305. The reception signal processing unit 304 performs UCI reception processing based on the UL control channel configuration instructed from the control unit 301.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 measures the UL channel quality based on, for example, the reception power (for example, RSRP (Reference Signal Received Power)) and / or the reception quality (for example, RSRQ (Reference Signal Received Quality)) of the UL reference signal. May be.
- the measurement result may be output to the control unit 301.
- FIG. 18 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 DL signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the DL 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 is also transferred to the application unit 205.
- UL 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, at least one of channel coding, rate matching, puncturing, DFT processing, and IFFT processing is 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 receives a DL signal (including a DL data signal, a DL control signal, and a DL reference signal) of the neurology set in the user terminal 20 and receives the UL signal (UL data signal) of the neurology. , UL control signal and UL reference signal).
- a DL signal including a DL data signal, a DL control signal, and a DL reference signal
- the UL signal (UL data signal) of the neurology. , UL control signal and UL reference signal).
- the transmission / reception unit 203 transmits UCI to the radio base station 10 using a UL data channel (for example, PUSCH) or a UL control channel (for example, PUCCH).
- the transmission / reception unit 203 also includes information on resource areas (for example, first to third UL control channel area information) and / or UL control channel configuration candidates that are candidates for the UL control channel configuration of each UL control channel configuration. Instruction information used for selection may be transmitted.
- 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. 19 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 19 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. As shown in FIG. 19, 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. For example, the control unit 401 controls generation of the UL signal by the transmission signal generation unit 402, mapping of the UL signal by the mapping unit 403, reception processing of the DL signal by the reception signal processing unit 404, and measurement by the measurement unit 405.
- control unit 401 selects a UL control channel configuration used for UCI transmission from the user terminal 20 from a plurality of UL control channel configurations.
- the control unit 401 may select the UL control channel configuration based on instruction information from the radio base station 10.
- the plurality of UL control channel configurations include the first UL control channel configuration and the second / third UL control channel configuration described above.
- control unit 401 sets resource areas (for example, first to third UL control channel areas) that are candidates for arranging the UL control channel having the selected UL control channel configuration.
- the resource region may be explicitly indicated by information that is signaled by higher layer signaling and / or physical layer, or may be set implicitly.
- control unit 401 determines at least one of a time resource, a frequency resource, a code resource, and a frequency hopping pattern in the resource area as a UCI transmission resource in the resource area.
- the transmission resource may be explicitly indicated by information that is signaled by higher layer signaling and / or physical layer signaling, or may be determined implicitly.
- control unit 401 controls generation and / or transmission of UCI. Specifically, the control unit 401 may change the UCI to be transmitted based on the selected UL control channel configuration. For example, the control unit 401 may determine whether or not to include retransmission control information (ACK / NACK) for the DL data channel in the UCI based on the selected UL control channel configuration. Further, the control unit 401 retransmits the DL data channel to the UCI based on the subframe (for example, the nxth subframe or the nxy subframe) in which the DL data channel is transmitted. Whether to include control information may be determined.
- ACK / NACK retransmission control information
- control unit 401 may control to drop at least a part of the UCI based on the selected UL control channel configuration. Specifically, the control unit 401 adds the UL control channel configuration payload selected according to at least one of UCI type (for example, ACK / NACK, CSI or SR), type, index, and priority. At least a part of the UCI may be dropped to fit.
- UCI type for example, ACK / NACK, CSI or SR
- the control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates a UL signal (including UL data signal, UL control signal, UL reference signal, UCI) based on an instruction from the control unit 401 (for example, encoding, rate matching, puncturing, modulation) And the like are output to the mapping unit 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 maps the UL signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs it to the transmission / reception unit 203.
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the DL signal (DL data signal, scheduling information, DL control signal, DL reference signal).
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401.
- the reception signal processing unit 404 outputs, for example, broadcast information, system information, higher layer control information by higher layer signaling such as RRC signaling, physical layer control information (L1 / L2 control information), 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 may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
- a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 20 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- 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.
- processor 1001 may be implemented by one or more chips.
- each function in the radio base station 10 and the user terminal 20 reads 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.
- predetermined software program
- it is realized by controlling data reading and / or writing 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, data, and the like 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
- the like data
- 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 such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by.
- 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.
- the communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured.
- FDD frequency division duplex
- TDD time division duplex
- 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, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, 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 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard.
- a component carrier CC: Component Carrier
- CC Component Carrier
- 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.
- the slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- 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.
- the TTI may be a transmission time unit of a channel-encoded data packet (transport block), or may be a processing unit such as scheduling or link adaptation.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
- 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 changed in various ways.
- 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.
- mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
- PUCCH Physical Uplink Control Channel
- PDCCH Physical Downlink Control Channel
- information elements can be identified by any suitable name, so the various channels and information elements assigned to them.
- the name is not limiting in any way.
- information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer.
- Information, signals, and the like may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, a memory), or may be managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
- information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI downlink control information
- UCI uplink control information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
- 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)).
- notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
- the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
- the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
- software, instructions, information, etc. may be sent and received via a transmission medium.
- software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.
- system and “network” used in this specification are used interchangeably.
- base station BS
- radio base station eNB
- cell e.g., a fixed station
- eNodeB eNodeB
- cell group e.g., a cell
- carrier femtocell
- component carrier e.g., a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- the base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.
- RRH indoor small base station
- MS mobile station
- UE user equipment
- terminal may be used interchangeably.
- a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- NodeB NodeB
- eNodeB eNodeB
- access point transmission point
- reception point femtocell
- small cell small cell
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
- 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.
- the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
- various operations performed for communication with a terminal may be performed by one or more network nodes other than the base station and the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
- the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction.
- the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.
- 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), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), 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), The present invention may be applied to a system using other appropriate wireless communication methods and / or a next generation system extended based on these.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc.
- “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
- connection refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof.
- connection may be read as “access”.
- the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples
- electromagnetic energy such as electromagnetic energy having a wavelength in the region, microwave region and / or light (both visible and invisible) region can be considered to be “connected” or “coupled” to each other.
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Abstract
Description
本実施の形態において、ユーザ端末は、上りリンク(UL)制御チャネルを用いて、上りリンク制御情報(UCI)を送信し、当該UCIの送信を制御する。UCIには、DLデータチャネルの再送制御情報(HARQ-ACK、ACK/NACK等ともいう)、チャネル状態情報(CSI)、スケジューリング要求(SR)の少なくとも一つが含まれればよい。
次に、本実施の形態に係る第1~第3のUL制御チャネル構成について詳細に説明する。なお、以下に示す図面では、ULからDLへの切り替え時間としてのギャップ期間は明示されていない。しかしながら、本実施の形態の第1~第3のUL制御チャネル構成は、DLからULへの切り替え時間及びULからDLへの切り替え時間としてのギャップ区間を明示する場合(図6B参照)にも適宜適用可能である。
第1のUL制御チャネル構成のUL制御チャネルが配置される候補となるリソース領域(第1のUL制御チャネル領域)は、サブフレームの最後から所定数のシンボルに、所定数のPRBに渡って設定される。
第2のUL制御チャネル構成のUL制御チャネルが配置される候補となるリソース領域(第2のUL制御チャネル領域)は、第1のUL制御チャネル領域よりも多い数(例えば、4以上)のシンボルを含んで構成される。なお、当該第2のUL制御チャネル領域は、サブフレーム内の全シンボルで構成されてもよいし、一部のシンボルで構成されてもよい。
第3のUL制御チャネル構成のUL制御チャネルが配置される候補となるリソース領域(第3のUL制御チャネル領域)は、第1のUL制御チャネル領域よりも多い数(例えば、4以上)のシンボルを含んで構成される。なお、当該第3のUL制御チャネル領域は、サブフレーム内の全シンボルで構成されてもよいし、一部のシンボルで構成されてもよい。また、第3のUL制御チャネル領域は、第2のUL制御チャネル領域とシンボル数が同一であってもよいし、異なっていてもよい。
次に、ユーザ端末におけるUL制御チャネル構成の選択制御について説明する。ユーザ端末は、複数のUL制御チャネル構成(例えば、第1~第3のUL制御チャネル構成)の中から、UCIの送信に用いるUL制御チャネル構成を選択する。
第2/第3のUL制御チャネル構成の参照信号の他の構成例について説明する。以上の本実施の形態では、サブフレームの最初の所定数のシンボルにDL制御チャネルが配置されるサブフレームを想定して、第2/第3のUL制御チャネル構成を説明した。
以下、本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16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18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、物理的及び/又は論理的に結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/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。
なお、本明細書で説明した用語及び/又は本明細書の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル及び/又はシンボルは信号(シグナリング)であってもよい。また、信号はメッセージであってもよい。参照信号は、RS(Reference Signal)と略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(CC:Component Carrier)は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 上りリンク(UL)制御チャネルを用いて、上りリンク制御情報(UCI)を送信する送信部と、
前記UCIの送信を制御する制御部と、を具備し、
前記UL制御チャネルの構成は、シンボル数が異なる複数の構成の中から選択されることを特徴とするユーザ端末。 - 前記複数の構成は、サブフレームの最後から所定数のシンボルで構成される第1の構成と、前記第1の構成よりも多い数のシンボルで構成される第2の構成及び/又は第3の構成と、を含むことを特徴とする請求項1に記載のユーザ端末。
- 前記第1の構成では、前記UL制御チャネルにCP-OFDM(Cyclic Prefix-Orthogonal Frequency Division Multiplexing)方式が適用され、
前記UCIと前記UL制御チャネルの復調用参照信号とが、サブキャリア単位で周波数分割多重されることを特徴とする請求項2に記載のユーザ端末。 - 前記第2の構成では、前記UL制御チャネルにDFT-S-OFDM(Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing)方式が適用され、
前記UCIと前記UL制御チャネルの復調用参照信号とが、シンボル単位で時間分割多重されることを特徴とする請求項2又は請求項3に記載のユーザ端末。 - 前記第3の構成では、前記UCIの拡散にCAZAC(Constant Amplitude Zero Auto-Correlation)系列が用いられ、
前記UCIと前記UL制御チャネルの復調用参照信号とが、シンボル単位で時間分割多重されることを特徴とする請求項2から請求項4のいずれかに記載のユーザ端末。 - ユーザ端末において、上りリンク(UL)制御チャネルを用いて、上りリンク制御情報(UCI)を送信する工程と、
前記ユーザ端末において、前記UCIの送信を制御する工程と、を有し、
前記UL制御チャネルの構成は、シンボル数が異なる複数の構成の中から選択されることを特徴とする無線通信方法。
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