WO2017110959A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017110959A1 WO2017110959A1 PCT/JP2016/088263 JP2016088263W WO2017110959A1 WO 2017110959 A1 WO2017110959 A1 WO 2017110959A1 JP 2016088263 W JP2016088263 W JP 2016088263W WO 2017110959 A1 WO2017110959 A1 WO 2017110959A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—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
- H04L5/0053—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
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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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
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
- LTE also referred to as LTE Rel. 8 or 9
- Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel.13, Rel.14, etc.
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- LTE Rel.13, Rel.14, etc. are also being studied.
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC Dual Connectivity
- CG Cell Group
- CC Cell Center
- frequency division duplex in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and DL transmission and UL transmission are in the same frequency band.
- Time Division Duplex which is performed by switching over time, is introduced.
- a transmission time interval (TTI) applied to DL transmission and UL transmission between the radio base station and the user terminal is set to 1 ms and controlled.
- the TTI in the existing system (LTE Rel. 8-12) is also called a subframe, a subframe length, or the like.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- Rel In future wireless communication systems such as LTE and 5G after 13th, communication in high frequency bands such as tens of GHz, relative to IoT (Internet of Things), MTC: Machine Type Communication, M2M (Machine To Machine), etc. It is assumed that communication with a small amount of data is performed. In such a future wireless communication system, when a communication method (for example, a transmission time interval (TTI) of 1 ms) in the existing system (LTE Rel. 8-12) is applied, there is a possibility that sufficient communication service cannot be provided. .
- TTI transmission time interval
- a shortened TTI a TTI shorter than a 1 ms TTI (hereinafter referred to as a normal TTI).
- PUSCH Physical Uplink Shared Channel
- the present invention has been made in view of such points, and an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of performing communication using an uplink shared channel having a configuration suitable for shortened TTI.
- an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of performing communication using an uplink shared channel having a configuration suitable for shortened TTI.
- One aspect of the user terminal of the present invention is a transmitter that transmits an uplink shared channel in a second TTI configured with a smaller number of symbols than a first transmission time interval (TTI), and a control that controls transmission of the uplink shared channel.
- the control unit sets the second TTI to include one of two symbols to which a demodulation reference signal for the uplink shared channel of the first TTI is transmitted, and the first TTI includes the first TTI.
- a reference signal for demodulation of an uplink shared channel of 2TTI is transmitted.
- communication can be performed using an uplink shared channel having a configuration suitable for shortened TTI.
- 2A and 2B are diagrams illustrating a configuration example of a shortened TTI.
- 3A to 3C are diagrams illustrating setting examples of the shortened TTI.
- 4A to 4C are diagrams illustrating an example of a PUSCH configuration of normal TTI.
- 5A and 5B are diagrams illustrating an example of a PUSCH configuration of a shortened TTI according to the first aspect.
- 6A and 6B are diagrams illustrating multiplexing examples of DMRS according to the first aspect.
- 7A and 7B are diagrams illustrating a first mapping example of DMRS according to the first aspect.
- 8A to 8C are diagrams illustrating a second mapping example of DMRS according to the first aspect.
- 9A and 9B are explanatory diagrams of an example of the Comb according to the first aspect.
- 10A and 10B are diagrams illustrating another example of the PUSCH configuration of the shortened TTI according to the first aspect.
- 11A and 11B are diagrams illustrating an example of a PUSCH configuration of a shortened TTI according to the second aspect. It is a figure which shows the 1st example of mapping of UCI which concerns on a 2nd aspect. It is a figure which shows the 2nd example of mapping of UCI which concerns on a 2nd aspect.
- 14A and 14B are diagrams illustrating an example of a PUSCH configuration of a shortened TTI according to the third aspect.
- FIG. 1 is a diagram illustrating an example of a TTI (normal TTI) in an existing system (LTE Rel. 8-12). As shown in FIG. 1, the normal TTI has a time length of 1 ms. A normal TTI is also called a subframe and is composed of two time slots. In the existing system, the normal TTI is a transmission time unit of one channel-coded data packet, and is a processing unit such as scheduling and link adaptation.
- the normal TTI is configured to include 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols (7 OFDM symbols per slot).
- Each OFDM symbol has a time length (symbol length) of 66.7 ⁇ s, and a normal CP of 4.76 ⁇ s is added. Since the symbol length and the subcarrier interval are inverse to each other, when the symbol length is 66.7 ⁇ s, the subcarrier interval is 15 kHz.
- the normal TTI is configured to include 14 SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols (7 SC-FDMA symbols per slot).
- SC-FDMA Single Carrier Frequency Division Multiple Access
- Each SC-FDMA symbol has a time length (symbol length) of 66.7 ⁇ s, and a normal CP of 4.76 ⁇ s is added. Since the symbol length and the subcarrier interval are inverse to each other, when the symbol length is 66.7 ⁇ s, the subcarrier interval is 15 kHz.
- the normal TTI may be configured to include 12 OFDM symbols (or 12SC-FDMA symbols).
- each OFDM symbol (or each SC-FDMA symbol) has a time length of 66.7 ⁇ s, and an extended CP of 16.67 ⁇ s is added.
- OFDM symbols may be used in the UL.
- symbols when the OFDM symbol and the SC-FDMA symbol are not distinguished, they are referred to as “symbols”.
- wireless interfaces suitable for high frequency bands such as tens of GHz, IoT (Internet of Things), MTC: Machine Type Communication, M2M (Machine To Machine), etc.
- IoT Internet of Things
- MTC Machine Type Communication
- M2M Machine To Machine
- a time margin for processing for example, encoding, decoding, etc.
- the number of user terminals that can be accommodated per unit time for example, 1 ms
- FIG. 2 is a diagram illustrating a configuration example of the shortened TTI.
- the shortened TTI has a time length (TTI length) shorter than 1 ms.
- the shortened TTI may be, for example, one or a plurality of TTI lengths with a multiple of 1 ms, such as 0.5 ms, 0.2 ms, and 0.1 ms.
- a normal TTI in the case of a normal CP, includes 14 symbols, so that it is one or a plurality of TTI lengths that are integer multiples of 1/14 ms, such as 7/14 ms, 4/14 ms, 3/14 ms, and 1/14 ms. May be.
- a normal TTI since a normal TTI includes 12 symbols, it is one or a plurality of TTI lengths that are integral multiples of 1/12 ms such as 6/12 ms, 4/12 ms, 3/12 ms, and 1/12 ms. May be.
- the normal CP or the extended CP can be configured by higher layer signaling such as broadcast information or RRC signaling. This makes it possible to introduce a shortened TTI while maintaining compatibility (synchronization) with a normal TTI of 1 ms.
- FIG. 2A is a diagram illustrating a first configuration example of the shortened TTI.
- the shortened TTI is composed of the same number of symbols as the normal TTI (here, 14 symbols), and each symbol has a symbol length of the normal TTI (for example, 66. A symbol length shorter than 7 ⁇ s).
- the normal TTI physical layer signal configuration (RE arrangement or the like) can be used.
- the same amount of information (bit amount) as that of normal TTI can be included in the shortened TTI.
- the symbol time length is different from that of the normal TTI symbol, it is difficult to frequency multiplex the shortened TTI signal and the normal TTI signal shown in FIG. 2A in the same system band (or cell, CC). It becomes.
- the subcarrier interval is usually wider than 15 kHz of TTI.
- the subcarrier interval becomes wide, it is possible to effectively prevent channel-to-channel interference due to Doppler shift during movement of the user terminal and transmission quality deterioration due to phase noise of the user terminal receiver.
- a high frequency band such as several tens of GHz, it is possible to effectively prevent deterioration in transmission quality by widening the subcarrier interval.
- FIG. 2B is a diagram illustrating a second configuration example of the shortened TTI.
- the shortened TTI is configured with a smaller number of symbols than the normal TTI, and each symbol has the same symbol length (for example, 66.7 ⁇ s) as the normal TTI.
- the shortened TTI is half the time length (0.5 ms) of the normal TTI, the shortened TTI is composed of half the normal TTI symbols (here, 7 symbols).
- the information amount (bit amount) included in the shortened TTI can be reduced as compared with the normal TTI.
- the user terminal can perform reception processing (for example, demodulation, decoding, etc.) of information included in the shortened TTI in a time shorter than normal TTI, and the processing delay can be shortened.
- the shortened TTI signal and the normal TTI signal shown in FIG. 2B can be frequency-multiplexed within the same system band (or cell, CC), and compatibility with the normal TTI can be maintained.
- FIGS. 2A and 2B show an example of a shortened TTI that assumes a case of a normal CP (a case where a normal TTI is composed of 14 symbols), but the configuration of the shortened TTI is shown in FIGS. 2A and 2B. It is not limited to things.
- the shortened TTI in FIG. 2A may be configured with 12 symbols
- the shortened TTI in FIG. 2B may be configured with 6 symbols.
- the shortened TTI only needs to have a shorter time length than the normal TTI, and the number of symbols, the symbol length, the CP length, and the like in the shortened TTI are arbitrary.
- Future wireless communication systems may be configured so that both normal TTI and shortened TTI can be set so as to be compatible with existing systems.
- the normal TTI and the shortened TTI may be mixed in time within the same CC (frequency domain).
- the shortened TTI may be set in a specific subframe of the same CC (or a specific time unit such as a specific radio frame).
- the shortened TTI is set in five consecutive subframes in the same CC, and the normal TTI is set in the other subframes. Note that the number and position of subframes in which the shortened TTI is set are not limited to those illustrated in FIG. 3A.
- carrier aggregation (CA) or dual connectivity (DC) may be performed by integrating the normal TTI CC and the shortened TTI CC.
- the shortened TTI may be set in a specific CC (more specifically, in the DL and / or UL of the specific CC).
- a shortened TTI is set in the DL of a specific CC
- a normal TTI is set in the DL and UL of another CC. Note that the number and position of CCs for which the shortened TTI is set are not limited to those shown in FIG. 3B.
- the shortened TTI may be set to a specific CC (primary (P) cell or / and secondary (S) cell) of the same radio base station.
- the shortened TTI may be set to a specific CC (P cell or / and S cell) in the master cell group (MCG) formed by the first radio base station, or the second radio It may be set to a specific CC (primary secondary (PS) cell or / and S cell) in the secondary cell group (SCG) formed by the base station.
- the shortened TTI may be set to either DL or UL.
- the normal TTI is set in the UL and the shortened TTI is set in the DL.
- a specific DL or UL channel or signal may be assigned (set) to the shortened TTI.
- the uplink control channel (PUCCH: Physical Uplink Control Channel) may be assigned to a normal TTI
- the uplink shared channel (PUSCH: Physical Uplink Shared Channel) may be assigned to a shortened TTI.
- the user terminal performs transmission of PUCCH by normal TTI and transmission of PUSCH by shortened TTI.
- the user terminal sets (or / and detects) a shortened TTI based on an implicit or explicit notification from the radio base station.
- an implicit notification example (2) broadcast information or RRC (Radio Resource Control) signaling, (3) MAC (Medium Access Control) signaling, (4) explicit by PHY (Physical) signaling
- RRC Radio Resource Control
- MAC Medium Access Control
- PHY Physical
- the user terminal transmits an LBT (Listen in frequency band (for example, 5G band, unlicensed band, etc.), system bandwidth (for example, 100 MHz, etc.), LAA (License Assisted Access). Applicability of Before Talk, type of data to be transmitted (eg, control data, voice, etc.), logical channel, transport block, RLC (Radio Link Control) mode, C-RNTI (Cell-Radio Network Temporary Identifier), etc.
- a shortened TTI may be set (for example, it is determined that a cell, a channel, a signal, or the like for communication is a shortened TTI).
- control information (DCI) addressed to the terminal itself is detected in the PDCCH mapped to the first 1, 2, 3, or 4 symbols of the normal TTI and / or 1 ms of EPDCCH
- 1 ms including the PDCCH / EPDCCH is normally used.
- Control information (DCI) addressed to own terminal is detected by PDCCH / EPDCCH (eg, PDCCH mapped to other than the first 1 to 4 symbols of TTI and / or EPDCCH of less than 1 ms) that has a configuration other than that determined as TTI
- a predetermined time interval of less than 1 ms including the PDCCH / EPDCCH may be determined as the shortened TTI.
- the control information (DCI) addressed to the own terminal can be detected based on the CRC check result for the blind-decoded DCI.
- the shortened TTI may be set based on setting information notified from the radio base station to the user terminal by broadcast information or RRC signaling.
- the setting information indicates, for example, which CC or / and subframe is used as a shortened TTI, which channel or / and signal is transmitted / received by the shortened TTI, or the like.
- the user terminal sets the shortened TTI to semi-static based on the setting information from the radio base station.
- mode switching between the shortened TTI and the normal TTI may be performed by an RRC reconfiguration procedure, an intra-cell handover (HO) in the P cell, and a CC (S cell in the S cell. ) Removal / addition procedure.
- the shortened TTI set based on the setting information notified by RRC signaling is activated or deactivated (activate or de-activate) by MAC signaling. May be.
- the user terminal enables or disables the shortened TTI based on an L2 control signal (for example, a MAC control element) from the radio base station.
- the user terminal is set in advance with a timer indicating the activation period of the shortened TTI by higher layer signaling such as RRC.
- the UL / DL allocation of the shortened TTI for a predetermined period is performed. If not done, the shortened TTI may be invalidated.
- Such a shortened TTI invalidation timer may count in units of normal TTI (1 ms), or may count in units of shortened TTI (for example, 0.25 ms). Note that, when switching between the shortened TTI mode and the normal TTI mode in the S cell, the S cell may be de-activated once, or it may be considered that a TA (Timing Advance) timer has expired. Thereby, the communication stop period at the time of mode switching can be provided.
- a shortened TTI set based on setting information notified by RRC signaling may be scheduled by PHY signaling.
- the user terminal receives and detects information included in the L1 control signal (for example, downlink control channel (PDCCH: Physical Downlink Control Channel or EPDCCH: Enhanced Physical Downlink Control Channel; hereinafter referred to as PDCCH / EPDCCH)). Based on, a shortened TTI is detected.
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- control information (DCI) for assigning transmission or reception in normal TTI and shortened TTI includes different information elements, and (4-1) the user terminal performs control including information elements for assigning transmission / reception in shortened TTI.
- DCI control information
- a predetermined time interval including the timing at which the PDCCH / EPDCCH is detected may be recognized as a shortened TTI.
- the user terminal can blind-decode control information (DCI) that allocates transmission or reception of both normal TTI and shortened TTI in PDCCH / EPDCCH.
- the user terminal detects downlink control information (DCI: Downlink) transmitted by the PDCCH / EPDCCH (when the control information (DCI) including an information element to which transmission / reception with the shortened TTI is allocated is detected)
- DCI downlink control information
- a predetermined time interval including the timing at which PDSCH or PUSCH scheduled by Control Information)) is transmitted / received may be recognized as a shortened TTI.
- the PDSCH scheduled by the PDCCH / EPDCCH (DCI transmitted by the PDCCH / EPDCCH) when the control information (DCI) including the information element to which transmission / reception with the shortened TTI is allocated is detected.
- HARQ-ACK Hybrid Automatic Repeat reQuest-Acknowledgement
- ACK / NACK A / N, etc.
- the user terminal may detect the shortened TTI based on the state of the user terminal (for example, Idle state or Connected state). For example, in the idle state, the user terminal may recognize all TTIs as normal TTIs and perform blind decoding only on the PDCCH included in the first 1 to 4 symbols of the 1 ms normal TTI. Further, when the user terminal is in the connected state, the user terminal may set (or / and detect) the shortened TTI based on at least one of the above notification examples (1) to (4).
- the state of the user terminal for example, Idle state or Connected state. For example, in the idle state, the user terminal may recognize all TTIs as normal TTIs and perform blind decoding only on the PDCCH included in the first 1 to 4 symbols of the 1 ms normal TTI. Further, when the user terminal is in the connected state, the user terminal may set (or / and detect) the shortened TTI based on at least one of the above notification examples (1) to (4).
- PUSCH demodulation reference signals (DMRS: DeModulation Reference Signal, UL DMRS, etc.) that are normally transmitted in TTI are mapped to predetermined symbols in each slot constituting a subframe.
- DMRS DeModulation Reference Signal
- UL DMRS UL DMRS
- the DMRS is mapped to the index 3 symbol (symbol at the center of each slot) as shown in FIGS. 4A-4C.
- the DMRS may be mapped to the index 2 symbol of each slot.
- a predetermined symbol to which DMRS is mapped is referred to as a DMRS symbol.
- the DMRS sequence length is the same as the transmission bandwidth of the PUSCH demodulated using the DMRS.
- at least 30 sequences are defined for each sequence length as DMRS sequences, and are grouped into 30 sequence groups.
- DMRS sequences used in the same cell belong to the same sequence group, and which sequence group (DMRS sequence index) is used in the cell may be changed between slots (group hopping).
- a sequence group (DMRS sequence index) may be determined based on a cell ID, may be notified to a user terminal by system information, or may be set in each PUSCH and PUCCH by user-specific RRC signaling. It may be determined based on the ID.
- DMRS is mapped to the same symbol (for example, the symbol of index 3 shown in FIGS. 4A to 4C) for any user terminal in any cell.
- interference is randomized in a plurality of DMRSs mapped to the same symbol by a cyclic shift (CS) and an orthogonal code (OCC).
- CS cyclic shift
- OCC orthogonal code
- FIG. 4A shows a configuration example in the case of transmitting uplink data (also referred to as uplink user data or UL data) without transmitting uplink control information (UCI: Uplink Control Information) by PUSCH in normal TTI.
- uplink data is mapped to each symbol other than two DMRS symbols.
- FIG. 4B shows a configuration example in the case where both UCI and uplink data are transmitted by PUSCH in normal TTI.
- the UCI may include at least one of a channel quality identifier (CQI: Channel Quality Indicator), a precoding matrix identifier (PMI: Precoding Matrix Indicator), a rank identifier (RI: Rank Indicator), and the above-described HARQ-ACK.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- RI rank identifier
- HARQ-ACK rank identifier
- the CQI and / or PMI (hereinafter referred to as CQI / PMI) is one PRB of a PUSCH transmission band (for example, one or more physical resource blocks (PRB)) in a normal TTI.
- CQI / PMI is one PRB of a PUSCH transmission band (for example, one or more physical resource blocks (PRB)) in a normal TTI.
- PRB physical resource blocks
- HARQ-ACK is mapped in the time direction from the other PRB of the transmission band to symbols adjacent to two DMRS symbols.
- RI is mapped in the time direction to symbols adjacent to HARQ-ACK.
- Uplink data, CQI / PMI, and RI are encoded and rate matched, multiplexed, and punctured based on HARQ-ACK.
- FIG. 4C shows a configuration example in the case where UCI is transmitted by PUSCH in normal TTI.
- CQI / PMI, HARQ-ACK, and RI are mapped to symbols in normal TTI.
- mapping image before applying DFT is exemplified.
- the symbols that are actually transmitted may be arranged interleaved in the frequency direction.
- the mapping images shown below are all before DFT application. Also, DFT is not applied to DMRS.
- the PUSCH in normal TTI is transmitted using the configuration shown in FIGS. 4A-4C.
- the PUSCH configuration in the normal TTI as described above cannot be directly applied to a shortened TTI (see FIG. 2B) configured with a smaller number of symbols than the normal TTI.
- a shortened TTI see FIG. 2B
- interference to user terminals (legacy UEs) that transmit PUSCH using normal TTI May increase.
- a shortened TTI is set so as to include one of 2DMRS symbols in a normal TTI, and a PUSCH DMRS of the shortened TTI is transmitted / received in the one symbol.
- the shortened TTI (second TTI) is configured with a smaller number of symbols than the normal TTI (first TTI), and each symbol has the same symbol length as the normal TTI (FIG. 2B). reference).
- the number of shortened TTIs included in the normal TTI is, for example, 2, 4, but is not limited thereto.
- the shortened TTI is also called partial TTI (short TTI), short TTI, sTTI, shortened subframe, short subframe, etc.
- the normal TTI is usually TTI, long TTI, lTTI, normal TTI, It is also called a normal subframe, a long subframe, a normal subframe, or simply a subframe.
- normal CP is applied to each symbol below is illustrated, it is not limited to this. The present embodiment can be applied as appropriate when an extended CP is applied to each symbol.
- FIG. 5 is a diagram illustrating an example of a PUSCH configuration in the shortened TTI (sTTI) according to the first aspect.
- FIG. 5A illustrates a case where two sTTIs are included per normal TTI (subframe)
- FIG. 5B illustrates a case where four sTTIs are included per subframe.
- a DMRS symbol is provided in the same symbol (center symbol of each slot) of normal TTIs.
- each sTTI is composed of 7 symbols including DMRS symbols.
- the user terminal maps the sTTI-1 DMRS to the DMRS symbol in the first slot (hereinafter referred to as the first DMRS symbol), and maps the sTTI-2 DMRS to the DMRS symbol in the second slot (hereinafter referred to as the second DMRS symbol). To do.
- each sTTI is composed of 4 symbols including DMRS symbols shared among a plurality of sTTIs.
- the first DMRS symbol is included in both sTTI-1 and STTI-2, and is shared by sTTI-1 and sTTI-2.
- the second DMRS symbol is included in both sTTI-3 and STTI-4, and is shared by sTTI-3 and STTI-4.
- different user terminals may transmit PUSCH, or the same user terminal may transmit PUSCH.
- the configuration examples shown in FIGS. 5A and 5B may be combined.
- one sTTI may be set in the first slot of the subframe as shown in FIG. 5A, and two sTTIs may be set in the second slot as shown in FIG. 5B. It may be set.
- the user terminal when a single DMRS symbol is used in a single sTTI, the user terminal, like a normal TTI DMRS, includes a CS / OCC indication field (included in the DCI to which the PUSCH of the sTTI is allocated).
- a DMRS can be generated using a cyclic shift index (CS index) and OCC indicated by the CS / OCC indicator field.
- the DMRSs of the plurality of sTTIs are multiplexed into a single DMRS symbol.
- the DMRSs of the plurality of sTTIs are multiplexed by a cyclic shift and / or a comb-shaped subcarrier arrangement (Comb). May be.
- FIG. 6 is a diagram showing a multiplexing example of a plurality of sTTI DMRS sharing the same DMRS symbol. Note that FIG. 6 illustrates an example of multiplexing DMRS when sTTI-1 and sTTI-2 in FIG. 5B share the first DMRS symbol, but the second DMRS symbol is used for sTTI-3 and sTTI-4. The same applies to sharing.
- FIG. 6A shows an example of multiplexing using a cyclic shift.
- Each sTTI DMRS is generated using a different CS index and mapped to the same DMRS symbol.
- the sTTI-1 DMRS is generated using the CS index #x
- the sTTI-2 DMRS is generated using the CS index #y.
- the CS index of each sTTI may be indicated by a predetermined field in the DCI (for example, a CS / OCC instruction field, a cyclic shift field, etc.).
- FIG. 6B shows an example of multiplexing using Comb.
- the subcarriers of Comb # 0 and # 1 are alternately arranged.
- a different comb (subcarrier) is assigned to each sTTI DMRS.
- Comb # 0 is assigned to the sTTI-1 DMRS
- Comb # 1 is assigned to the sTTI-2 DMRS.
- DMRS is generated using either CS index #x or #y
- DMRS is mapped to either Comb # 0 or # 1.
- DMRS of each sTTI may be multiplexed using both the cyclic shift shown in FIG. 6A and the Comb shown in FIG. 6B.
- three or more DMRSs can be multiplexed by multiplexing a plurality of DMRSs by cyclic shift in the same comb.
- FIG. 7 is a diagram illustrating a case where the same user terminal transmits PUSCH among a plurality of sTTIs sharing the same DMRS symbol.
- the user terminal since a plurality of sTTI PUSCHs are allocated to the same user terminal, the user terminal may transmit only one DMRS of the plurality of sTTIs.
- PUSCH can be assigned to different PRBs among a plurality of sTTIs sharing the same DMRS symbol.
- the DMRS may be mapped to a PRB including at least a PRB (assigned PRB) assigned to the PUSCH by the plurality of sTTIs.
- the user terminal determines a PRB (mapping PRB) to which DMRS is mapped (transmitted) based on the assigned PRBs in a plurality of sTTIs sharing the same DMRS symbol.
- the user terminal maps and transmits DMRS of either sTTI-1 or sTTI-2 to consecutive PRBs including the assigned PRBs of sTTI-1 and sTTI-2 in the first DMRS symbol. To do. Further, the user terminal maps and transmits DMRS of either sTTI-3 or sTTI-4 to consecutive PRBs including the assigned PRBs of sTTI-3 and sTTI-4 in the second DMRS symbol.
- the user terminal may map and transmit the DMRS of sTTI-1 to the allocated PRB of sTTI-1 in the first DMRS symbol.
- the user terminal may map and transmit the DMRS of sTTI-3 to the allocated PRB of sTTI-3 in the second DMRS symbol.
- the user terminal may map and transmit the DMRS of sTTI-2 to the allocated PRB of sTTI-2 in the first DMRS symbol.
- the user terminal may map and transmit the DMRS of sTTI-4 to the allocated PRB of sTTI-4 in the second DMRS symbol.
- the mapping PRB in the DMRS symbol is determined based on the allocation PRB of the plurality of sTTIs sharing the same DMRS symbol, so that the PUSCH can be flexibly allocated in the plurality of sTTIs, and Channel estimation in all PRBs assigned with multiple sTTIs can be performed. Also, DMRS can be mapped in consideration of the plurality of sTTIs in the DMRS symbol.
- PUSCH is assigned to the same PRB among a plurality of sTTIs sharing the same DMRS symbol (PUSCH cannot be assigned to different PRBs).
- the DMRS is mapped to the same PRB as the assigned PRB of any of the plurality of sTTIs.
- the user terminal determines a mapping PRB in the DMRS symbol based on the assigned PRB in any of a plurality of sTTIs sharing the same DMRS symbol (for example, the first sTTI).
- the user terminal maps and transmits only the sTTI-1 DMRS to the sTTI-1 assigned PRB.
- a user terminal scheduled for PUSCH in sTTI-1 is not assigned a different PRB in sTTI-2.
- the user terminal maps and transmits only the sTTI-3 DMRS to the sTTI-3 allocated PRB.
- the user terminal scheduled for PUSCH in sTTI-4 is not assigned a different PRB in sTTI-4.
- the mapping PRB and the DMRS sequence in the DMRS symbol are determined only by the first sTTI among the plurality of sTTIs sharing the same DMRS symbol, so that the time-sequential sTTI allocation information is decoded. Since channel estimation can be started without waiting, the effect of reducing processing delay can be improved.
- FIG. 8 is a diagram illustrating a case where different user terminals transmit PUSCH among a plurality of sTTIs sharing the same DMRS symbol.
- PUSCH is allocated to different user terminals among the plurality of sTTIs
- different CS indexes and / or different Combs are applied to DMRSs of the plurality of sTTIs.
- PUSCHs are assigned to different PRBs among a plurality of sTTIs sharing the same DMRS symbol.
- the plurality of sTTI DMRSs may be multiplexed using Comb.
- the DMRSs of the plurality of sTTIs are mapped to different Combs in each sTTI allocation PRB.
- the user terminal maps the DMRS of sTTI-1 to Comb # 0 in the assigned PRB of sTTI-1.
- the user terminal maps the DMRS of sTTI-2 to Comb # 1 in the assigned PRB of sTTI-2.
- the DMRS is mapped only to the subcarrier of Comb # 0.
- DMRS is mapped only to the subcarrier of Comb # 1.
- DMRS is mapped to the subcarriers of Comb # 0 and # 1.
- PUSCH is assigned to the same PRB among a plurality of sTTIs sharing the same DMRS symbol.
- the plurality of sTTI DMRSs may be multiplexed using a cyclic shift.
- the plurality of sTTI DMRSs are mapped to the same PRB using different CS indexes.
- the user terminal determines a mapping PRB in the DMRS symbol based on the assigned PRB in any one of the plurality of sTTIs (for example, the first sTTI).
- the user terminal generates a DMRS of sTTI-1 and a DMRS of sTTI-2 using different CS indexes, and maps them to the assigned PRB of sTTI-1 in the first DMRS symbol.
- a user terminal scheduled for PUSCH in sTTI-1 is not assigned a different PRB in sTTI-2.
- a DMRS of a plurality of sTTIs can be multiplexed by a cyclic shift, and a Comb is applied to the DMRS. It is possible to improve compatibility with existing systems that do not. Also, since the DMRS mapping PRB can be determined by only the first sTTI among the plurality of sTTIs, the effect of reducing the processing delay can be improved.
- Comb when a plurality of sTTI DMRSs sharing the same DMRS symbol are multiplexed by Comb, Comb may be explicitly assigned to each sTTI DMRS, or implicitly assigned. May be.
- the Comb index may be indicated by the value of a predetermined field (eg, CS / OCC indication field, cyclic shift field, etc.) included in DCI (eg, UL grant to which PUSCH is allocated). For example, if the CS / OCC indication field value is 0, it may indicate Comb index # 0, and if the CS / OCC indication field value is 1, it may indicate Comb index # 1.
- a predetermined field eg, CS / OCC indication field, cyclic shift field, etc.
- the user terminal may determine the Comb index based on the position, index, and the like of sTTI that transmits PUSCH (PUSCH is scheduled). In this case, which Comb is allocated to each sTTI sharing the same DMRS symbol may be determined in advance or may be notified by higher layer signaling. For example, in FIG. 8A, the user terminal determines Comb index # 0 for the DMRS of sTTI-1 (or sTTI-3), and the Comb index for the DMRS of sTTI-2 (or sTTI-4) # 1 may be determined.
- FIG. 9 is a diagram illustrating the relationship between transmission power and PSD (Power Spectrum Density). As shown in FIG. 9A, when the transmission power of the DMRS and PUSCH to which the Comb is applied is the same, the PSD of the DMRS becomes the number of combs of the PSD of the PUSCH (here, 2) times.
- the user terminal may multiply the transmission power of the DMRS to which the Comb is applied by 1 / Comb number (in this case, 1/2) times.
- 1 / Comb number in this case, 1/2
- the PSD of the DMRS becomes low, and the PSD of the DMRS and the PSD of the PUSCH become equivalent.
- the DMRSs of the plurality of sTTIs are multiplexed by cyclic shift. Absent.
- the plurality of sTTI DMRSs may be multiplexed by Comb.
- the interference with the legacy UE that transmits the PUSCH with the normal TTI is not increased.
- PUSCH can be transmitted by sTTI, and processing delay can be reduced.
- an additional DMRS symbol (hereinafter referred to as an additional DMRS symbol) is provided in each sTTI in addition to the first and second DMRS symbols will be described with reference to FIG. Note that FIG. 10 will be described with a focus on differences from FIG.
- FIG. 10 is a diagram illustrating another example of the PUSCH configuration in the sTTI according to the first aspect.
- FIG. 10A illustrates a case where two sTTIs are included per subframe
- FIG. 10B illustrates a case where four sTTIs are included per subframe.
- an additional DMRS symbol may be provided for each sTTI in addition to the first and second DMRS symbols.
- an additional DMRS symbol is provided in the first symbol (index 0) in sTTI-1, and an additional DMRS symbol is provided in the last symbol (index 6) in sTTI-2.
- an additional DMRS symbol is provided in the first symbol (index 0)
- an additional DMRS symbol is provided in the last symbol (index 6).
- sTTI-3 and sTTI-4 Note that the position of the additional DMRS symbol is not limited to that shown in FIGS. 10A and 10B.
- the DMRS of the first and second DMRS symbols can be generated using at least one of the CS index, OCC, and Comb as described with reference to FIGS. 5-8. Thereby, orthogonality and randomization with the legacy UE that transmits the PUSCH in the normal TTI can be ensured.
- the DMRS of the additional DMRS symbol may be generated using a DMRS sequence and / or CS index of a group (DMRS sequence index) different from the first and second DMRS symbols.
- the group (DMRS sequence index) for generating the DMRS sequence may be changed between the first and second DMRS symbols and the additional DMRS symbol.
- the PUSCH channel estimation accuracy transmitted by sTTI may be set to the same level as PUSCH transmitted by normal TTI. it can. For this reason, the channel estimation accuracy of PUSCH transmitted by sTTI can be improved compared with the configuration shown in FIGS. 5A and 5B.
- 10A and 10B are merely examples, and the number of DMRS symbols in the sTTI is not limited to this.
- the number of DMRS symbols in the sTTI is not limited to this.
- FIGS. 10A and 10B by providing two or more additional DMRS symbols, three or more DMRS symbols may be provided per sTTI.
- the channel estimation accuracy can be further improved by increasing the number of DMRS symbols per sTTI.
- the additional DMRS symbol may be set to the last symbol of the last sTTI (for example, sTTI-2 in FIG. 10A, sTTI-4 in FIG. 10B) in the subframe. Accordingly, when a legacy UE that transmits PUSCH using normal TTI uses a format (Shortened format) in which uplink data is not allocated to the final symbol, interference from the DMRS of sTTI (additional DMRS) in the final symbol can be avoided.
- SRS sounding reference signal
- channel estimation accuracy of PUSCH transmitted by sTTI can be improved while preventing interference with a legacy UE that transmits PUSCH by normal TTI.
- the UCI and uplink data mapping method in the second mode can be applied as appropriate to the case where an additional DMRS symbol is provided in each sTTI in addition to the first and second DMRS symbols (FIG. 10).
- FIG. 11 is a diagram illustrating an example of a PUSCH configuration in sTTI according to the second aspect.
- FIG. 11A illustrates a case where two sTTIs are included per subframe
- FIG. 11B illustrates a case where four sTTIs are included per subframe. Note that in FIGS. 11A and 11B, a plurality of shortened TTIs have different UCIs regardless of whether a PUSCH is assigned to the same user terminal in a plurality of sTTIs or a PUSCH is assigned to different user terminals. And uplink data are mapped.
- the UCI may be mapped using the same rule as the UCI mapped in the normal TTI.
- 12 and 13 are diagrams showing mapping rules in the sTTI configuration shown in FIGS. 11A and 11B, respectively. 12 and 13, the numbers assigned to resources indicate the mapping order of CQI / PMI, RI, and HARQ-ACK.
- the CQI / PMI is mapped in the time direction to a symbol excluding the DMRS symbol from one PRB of the PUSCH transmission band.
- HARQ-ACK is mapped in the time direction from the other PRB of the transmission band to two symbols adjacent to the DMRS symbol.
- RI is mapped in the time direction to two symbols outside the two symbols to which HARQ-ACK is mapped.
- the uplink data is encoded and rate-matched, multiplexed with CQI / PMI and RI, and punctured based on HARQ-ACK.
- CQI / PMI and RI CQI / PMI and RI
- punctured based on HARQ-ACK.
- UCI and uplink data of each sTTI are mapped and mapped only to symbols excluding DMRS symbols in each sTTI.
- the number of REs is usually reduced compared to TTI.
- the UCI and uplink data of each sTTI are mapped to only symbols excluding DMRS symbols in each sTTI by applying the normal TTI mapping rule, and the number of REs to be mapped Usually decreases compared to TTI.
- HARQ-ACK and RI are each mapped to a single symbol in each sTTI. Therefore, the mapping in the time direction of HARQ-ACK and RI in FIG. 13 is synonymous with the mapping in the frequency direction.
- FIG. 14 is a diagram illustrating an example of a PUSCH configuration in the shortened TTI according to the third aspect.
- the PUSCH configuration shown in FIGS. 14A and 14B is the same as the PUSCH configuration described in the second mode (FIGS. 11A and 11B) except that there is no uplink data mapping. Since the mapping method of UCI of each sTTI in FIGS. 14A and 14B is the same as that in the second mode, description thereof is omitted.
- FIG. 14 demonstrates the case where the 1st and 2nd DMRS symbol similar to normal TTI is maintained (FIG. 5), it is not restricted to this.
- the UCI mapping technique in the third aspect is also applicable to cases where additional DMRS symbols are provided in each sTTI in addition to the first and second DMRS symbols (FIG. 10).
- the predetermined threshold may be notified to the user terminal by higher layer signaling.
- the CQI / PMI payload exceeds a predetermined threshold, or the ratio of the CQI / PMI payload to the number of PUSCH REs (that is, the coding rate) has a predetermined threshold. If so, the lower priority CQI / PMI may be dropped (transmission may be aborted). Note that the priority of CQI / PMI may be the same as the priority in the existing system.
- a plurality of The RIs of the cells may be combined. It should be noted that which cell's RI is to be combined may be notified to the user terminal by higher layer signaling.
- a method for combining RIs of a plurality of cells (1) using an average of RIs of a plurality of cells, (2) using a maximum value of RIs of a plurality of cells, and (3) a minimum of RIs of a plurality of cells. It is conceivable to use a value.
- the data included in the PUSCH transmitted by sTTI, CQI / PMI, RI, and HARQ-ACK may be regarded as a single codeword, and may be jointly encoded. As a result, it is possible to omit CRC bits individually added to data and UCI, thereby reducing overhead. If the data (transport block) is large and is divided into a plurality of code blocks and encoded respectively, UCI may be jointly encoded to the code block of the first, last, or specific order. Good. At this time, the concatenated bit string of data and UCI may be configured in the order of data, HARQ-ACK, RI, and CQI / PMI.
- 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.
- the wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), or the like.
- 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. . Moreover, the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, six or more CCs).
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the uplink.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Including. Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH.
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel shared by each user terminal 20
- an uplink control channel PUCCH: Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by the PUSCH.
- Uplink control information including at least one of delivery confirmation information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- FIG. 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 uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the transmission / reception unit 103 receives the PUSCH in a shortened TTI (second TTI) configured with a smaller number of symbols than the normal TTI (first TTI).
- the PUSCH may include uplink data (first mode), both uplink data and UCI (second mode), or UCI (first mode). 3 embodiment).
- the transmission / reception section 103 uses the one symbol for the PUSCH of the shortened TTI.
- Receive DMRS when an additional DMRS symbol is set in the shortened TTI, the transmission / reception unit 103 may receive the DMRS of the shortened TTI using the additional DMRS symbol.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.
- CPRI Common Public Radio Interface
- X2 interface also good.
- FIG. 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, and a reception signal processing unit 304.
- the control unit 301 controls the entire radio base station 10.
- the control unit 301 controls, for example, downlink signal generation by the transmission signal generation unit 302, signal mapping by the mapping unit 303, and signal reception processing by the reception signal processing unit 304.
- control unit 301 performs downlink (DL) signal transmission control (for example, modulation scheme, coding rate, resource allocation (scheduling)) based on channel state information (CSI) reported from the user terminal 20. Control).
- DL downlink
- CSI channel state information
- control unit 301 controls a transmission time interval (TTI) used for receiving a downlink signal and / or transmitting an uplink signal.
- TTI transmission time interval
- the control unit 301 sets a normal TTI of 1 ms or / and a shortened TTI shorter than the normal TTI.
- the configuration example and setting example of the shortened TTI are as described with reference to FIGS.
- the control unit 301 provides the user terminal 20 with an explicit notification by at least one of (1) implicit notification, or (2) RRC signaling, (3) MAC signaling, and (4) PHY signaling.
- the setting of the shortened TTI may be instructed.
- control unit 301 sets each shortened TTI (second TTI) so as to include one of two symbols (DMRS symbols) in which the DMRS of the PUSCH of the normal TTI (first TTI) is transmitted (FIG. 5). 10, 11 and 14).
- the control unit 301 controls the received signal processing unit 304 to demodulate the PUSCH in the shortened TTI based on the DMRS received by the 1 DMRS symbol (or the 1 DMRS symbol and the additional DMRS symbol).
- the control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates a downlink signal (including a downlink data signal and a downlink control signal) based on an instruction from the control unit 301 and outputs it to the mapping unit 303. Specifically, the transmission signal generation unit 302 generates a downlink data signal (PDSCH) including notification information (control information) by the above-described higher layer signaling and user data, and outputs it to the mapping unit 303. Also, the transmission signal generation unit 302 generates a downlink control signal (PDCCH / EPDCCH) including the above-described DCI, and outputs it to the mapping unit 303. Also, the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- PDSCH downlink data signal
- PDCCH / EPDCCH downlink control signal
- the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- the transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103.
- the mapping unit 303 can be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the uplink signal transmitted from the user terminal 20. Specifically, received signal processing section 304 demodulates the PUSCH in the shortened TTI using the DMRS received in the 1DMRS symbol (or the 1DMRS symbol and the additional DMRS symbol) included in the shortened TTI. The processing result is output to the control unit 301.
- reception processing for example, demapping, demodulation, decoding, etc.
- the reception signal processing unit 304 may be configured by a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device, which are described based on common recognition in the technical field according to the present invention. it can.
- FIG. 18 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202.
- Each transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- Downlink data (user data) is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- the uplink data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, rate matching, puncturing, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Are transferred to each transmitting / receiving unit 203. Also for UCI, channel coding, rate matching, puncturing, DFT processing, IFFT processing, and the like are performed and transferred to each transmitting / receiving section 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 transmits the PUSCH in a shortened TTI (second TTI) configured with a smaller number of symbols than the normal TTI (first TTI).
- the PUSCH may include uplink data (first mode), both uplink data and UCI (second mode), or UCI (first mode). 3 embodiment).
- the transmission / reception section 203 uses the 1 DMRS symbol for the PUSCH of the shortened TTI. Send DMRS. Further, when an additional DMRS symbol is set in the shortened TTI, the transmission / reception unit 203 may transmit the DMRS of the shortened TTI using the additional DMRS symbol.
- 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.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402, signal mapping by the mapping unit 403, and signal reception processing by the reception signal processing unit 404.
- control unit 401 controls a transmission time interval (TTI) used for receiving a downlink (DL) signal and / or transmitting an uplink (UL) signal.
- TTI transmission time interval
- the control unit 301 sets a normal TTI of 1 ms or / and a shortened TTI shorter than the normal TTI.
- the configuration example and setting example of the shortened TTI are as described with reference to FIGS.
- the control unit 401 is based on an explicit notification from the radio base station 10 (1) an implicit notification or at least one of (2) RRC signaling, (3) MAC signaling, and (4) PHY signaling.
- the shortened TTI may be set (detected).
- control unit 401 sets the shortened TTI (second TTI) so as to include one of the 2DMRS symbols in which the PUSCH DMRS in the normal TTI (first TTI) is transmitted (FIGS. 5, 10, 11 and 11). 14).
- control unit 401 controls the transmission signal generation unit 402 so as to transmit the DMRS in the shortened TTI using the 1DMRS symbol (or the 1DMRS symbol and the additional DMRS symbol).
- the control unit 401 when a plurality of shortened TTIs include the 1DMRS symbol, the control unit 401 multiplexes and transmits the plurality of shortened TTI demodulation reference signals in the 1DMRS symbol. That is, the control unit 401 multiplexes a DMRS of a shortened TTI and a DMRS of another shortened TTI among the plurality of shortened TTIs, and transmits the multiplexed DMRS in the 1 DMRS symbol. For the multiplexing, cyclic shift and / or Comb can be used.
- the control unit 401 uses each of the plurality of shortened TTIs.
- a PRB that transmits DMRS is determined based on the assigned PRB.
- the control unit 401 may control the transmission signal generation unit 402 so as to transmit DMRS of any one of the plurality of shortened TTIs (for example, the earliest shortened TTI) using the determined PRB.
- the control unit 401 has the plurality of shortened TTIs.
- the PRB assigned by any one is determined as the PRB that transmits the DMRS.
- the control unit 401 may control the transmission signal generation unit 402 so as to transmit DMRS of any one of the plurality of shortened TTIs (for example, the earliest shortened TTI) using the determined PRB.
- the control unit 401 uses the Comb to The DMRS of the shortened TTI may be multiplexed on the 1 DMRS symbol. Specifically, the control unit 401 controls the transmission signal generation unit 402 to transmit the DMRS of the shortened TTI using a Comb index different from that of the other user terminals 20.
- the Comb index may be indicated in a predetermined field of DCI, or may be determined in advance according to sTTI.
- the control unit 401 uses the cyclic shift to The DMRS of the shortened TTI may be multiplexed on the 1 DMRS symbol. Specifically, the control unit 401 controls the transmission signal generation unit 402 to transmit the DMRS of the shortened TTI using a CS index different from that of the other user terminals 20. It should be noted that which CS index is used may be indicated by a predetermined field (for example, CS / OCC field) of DCI.
- the control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 Based on an instruction from the control unit 401, the transmission signal generation unit 402 generates an uplink signal (including an uplink data signal and an uplink control signal) (for example, encoding, rate matching, puncturing, modulation, etc.) and performs mapping. Output to the unit 403. For example, the transmission signal generation unit 402 generates PUSCH including uplink data, PUSCH including uplink data and UCI (at least one of HARQ-ACK, CQI / PMI, and RI), and PUSCH including UCI.
- an uplink signal including an uplink data signal and an uplink control signal
- the transmission signal generation unit 402 generates PUSCH including uplink data
- PUSCH including uplink data and UCI at least one of HARQ-ACK, CQI / PMI, and RI
- PUSCH including UCI at least one of HARQ-ACK, CQI / PMI, and RI
- the transmission signal generation unit 402 uses any one of the shortened TTIs (for example, the earliest shortened TTI).
- a DMRS is generated using a CS index and / or OCC indicated by DCI.
- the transmission signal generation unit 402 transmits the CS index indicated by DCI with the shortened TTIs transmitted by the user terminals 20 and / or Alternatively, DMRS is generated using OCC.
- the transmission signal generation unit 402 may generate the DMRS transmitted by the additional DMRS symbol using a DMRS sequence of a group (DMRS sequence index) different from the DMRS transmitted by the 1 DMRS symbol.
- the transmission signal generation unit 402 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 403 maps the UL signal (uplink control signal and / or uplink data signal) generated by the transmission signal generation unit 402 to a radio resource and outputs the radio signal to the transmission / reception unit 203. To do.
- the mapping unit 403 maps the DMRS generated by the transmission signal generation unit 402 to the PRB determined by the control unit 401 in the 1 DMRS symbol (or including the additional DMRS symbol).
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on downlink signals (including downlink control signals and downlink data signals).
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401.
- the received signal processing unit 404 outputs, for example, broadcast information, system information, control information by higher layer signaling such as RRC signaling, DCI, and the like to the control unit 401.
- the received signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the measurement unit 405 measures the channel state based on a reference signal (for example, CSI-RS) from the radio base station 10 and outputs the measurement result to the control unit 401. Note that the channel state measurement may be performed for each CC.
- a reference signal for example, CSI-RS
- the measuring unit 405 can be composed of a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device which are explained based on common recognition in the technical field according to the present invention.
- each functional block (components) are realized by any combination of hardware and / or software.
- the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- the radio base station, user terminal, and the like in this embodiment may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 20 is a diagram illustrating an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the present embodiment.
- the storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input.
- the output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 may include hardware such as a microprocessor, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). A part or all of each functional block may be realized by the hardware.
- the processor 1001 may be implemented by at least one of these hardware.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)). ), SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- MAC CE Control Element
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems and / or extended based on these It may be applied to the next generation system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- communication system 5G (5th generation mobile communication system
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Abstract
Description
第1の態様では、短縮TTIで割り当てられるPUSCHを用いてUCIを送信せずに上りデータを送信する場合のPUSCHの構成例を説明する。
図5は、第1の態様に係る短縮TTI(sTTI)におけるPUSCH構成の一例を示す図である。図5Aでは、通常TTI(サブフレーム)あたり2つのsTTIを含む場合、図5Bでは、サブフレームあたり4つのsTTIを含む場合が示される。図5A及び5Bに示すように、複数のsTTIを含むサブフレームでは、通常TTIの同一のシンボル(各スロットの中央のシンボル)にDMRSシンボルが設けられる。
図10を参照し、上記第1及び第2DMRSシンボルに加えて、各sTTIに追加のDMRSシンボル(以下、追加DMRSシンボルという)を設ける場合について説明する。なお、図10については、図5との相違点を中心に説明する。
第2の態様では、sTTIで割り当てられるPUSCHを用いてUCI及び上りデータの双方を送信する場合のPUSCHの構成例を説明する。第2の態様における各sTTIにおけるDMRSの送信方法は、第1の態様と同様であるため、説明を省略する。第2の態様では、第1の態様で説明したように構成されるsTTI内のリソースエレメント(RE)に対するUCI及び上りデータのマッピングについて詳述する。
第3の態様では、sTTIで割り当てられるPUSCHを用いて上りデータを送信せずにUCIを送信する場合のPUSCHの構成例を説明する。第3の態様に係るPUSCH構成は、上りデータのマッピングがない点を除いて、第2の態様と同様である。
第2及び第3の態様で説明したように、sTTIのPUSCHでUCIを送信する場合(UCI on PUSCH)、通常TTIのPUSCHで送信されるUCIとは異なるルールで、ペイロード制限が行われてもよい。
以下、本発明の一実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記各態様に係る無線通信方法が適用される。なお、上記各態様に係る無線通信方法は、それぞれ単独で適用されてもよいし、組み合わせて適用されてもよい。
図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に係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、MIMO伝送のための複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。
なお、上記実施の形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的に結合した1つの装置により実現されてもよいし、物理的に分離した2つ以上の装置を有線又は無線で接続し、これら複数の装置により実現されてもよい。
Claims (10)
- 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIにおいて上り共有チャネルを送信する送信部と、
前記上り共有チャネルの送信を制御する制御部と、を具備し、
前記制御部は、前記第1TTIの上り共有チャネルの復調用参照信号が送信される2シンボルの1つを含むように前記第2TTIを設定し、前記1シンボルで前記第2TTIの上り共有チャネルの復調用参照信号を送信することを特徴とするユーザ端末。 - 複数の第2TTIが前記1シンボルを含む場合、前記制御部は、前記複数の第2TTIにおける上り共有チャネルの復調用参照信号を前記1シンボル内に多重して送信することを特徴とする請求項1に記載のユーザ端末。
- 前記複数の第2TTIにおいて同一のユーザ端末が上り共有チャネルを送信する場合で、かつ、該上り共有チャネルに異なるリソースブロックを割り当て可能である場合、前記制御部は、前記複数の第2TTIでそれぞれ割り当てられるリソースブロックに基づいて決定されるリソースブロックを用いて、前記複数の第2TTIのいずれかの復調用参照信号を前記1シンボル内で送信することを特徴とする請求項2に記載のユーザ端末。
- 前記複数の第2TTIにおいて同一のユーザ端末が上り共有チャネルを送信する場合で、かつ、該上り共有チャネルに異なるリソースブロックを割り当て可能でない場合、前記制御部は、前記複数の第2TTIのうちで最も早い第2TTIで割り当てられるリソースブロックを用いて、前記複数の第2TTIのいずれかの復調用参照信号を前記1シンボル内で送信することを特徴とする請求項2に記載のユーザ端末。
- 前記複数の第2TTIにおいて異なるユーザ端末が上り共有チャネルを送信する場合で、かつ、該上り共有チャネルに異なるリソースブロックを割り当て可能である場合、前記制御部は、Combを用いて前記複数の第2TTIの復調用参照信号を前記第1シンボル内で多重することを特徴とする請求項2に記載のユーザ端末。
- 前記複数の第2TTIにおいて異なるユーザ端末が上り共有チャネルを送信する場合で、かつ、該上り共有チャネルに異なるリソースブロックを割り当て可能でない場合、前記制御部は、巡回シフトを用いて前記複数の第2TTIの復調用参照信号を前記第1シンボル内で多重することを特徴とする請求項2に記載のユーザ端末。
- 前記制御部は、前記第2TTIに含まれる他のシンボルで、前記第2TTIの復調用参照信号を送信することを特徴とする請求項1から請求項6のいずれかに記載のユーザ端末。
- 前記制御部は、前記第1TTI内でマッピングされる上り制御情報と同一のルールを用いて、前記第2TTI内で上り制御情報をマッピングすることを特徴とする請求項1から請求項7のいずれかに記載のユーザ端末。
- 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIにおいて上り共有チャネルを受信する受信部と、
前記上り共有チャネルの受信を制御する制御部と、を具備し、
前記制御部は、前記第1TTIの上り共有チャネルの復調用参照信号が受信される2シンボルの1つを含むように前記第2TTIを設定し、前記1シンボルで受信される復調用参照信号を用いて、前記第2TTIの上り共有チャネルを復調することを特徴とする無線基地局。 - 第1伝送時間間隔(TTI)よりも少ないシンボル数で構成される第2TTIを用いた無線通信方法であって、ユーザ端末において、
前記第1TTIの上り共有チャネルの復調用参照信号が送信される2シンボルの1つを含むように前記第2TTIを設定する工程と、
前記第2TTIにおいて上り共有チャネルを送信するとともに、前記1シンボルで前記第2TTIの上り共有チャネルの復調用参照信号を送信する工程と、を有することを特徴とする無線通信方法。
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Also Published As
Publication number | Publication date |
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IL260219A (en) | 2018-07-31 |
CN108464045B (zh) | 2023-05-30 |
CN108464045A (zh) | 2018-08-28 |
US20190007248A1 (en) | 2019-01-03 |
EP3383111A1 (en) | 2018-10-03 |
JP6954841B2 (ja) | 2021-10-27 |
EP3383111A4 (en) | 2018-12-19 |
JPWO2017110959A1 (ja) | 2018-11-08 |
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