WO2017195721A1 - ユーザ端末及び無線通信方法 - Google Patents
ユーザ端末及び無線通信方法 Download PDFInfo
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- WO2017195721A1 WO2017195721A1 PCT/JP2017/017353 JP2017017353W WO2017195721A1 WO 2017195721 A1 WO2017195721 A1 WO 2017195721A1 JP 2017017353 W JP2017017353 W JP 2017017353W WO 2017195721 A1 WO2017195721 A1 WO 2017195721A1
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- tti
- transmission
- pdsch
- base station
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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
- H04L5/0078—Timing of allocation
- H04L5/0082—Timing of allocation at predetermined intervals
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0038—Blind format detection
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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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
- H04L5/0055—Physical resource allocation for ACK/NACK
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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
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a 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
- H04L5/0001—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
- LTE Advanced also referred to as LTE Rel.10, 11 or 12
- LTE Rel.8 the successor system
- LTE Rel.13 or later the successor system
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC Dual Connectivity
- CG Cell Group
- CC Cell Center
- FDD frequency division duplex
- DL downlink
- UL uplink
- TDD Time division duplex
- a transmission time interval (TTI: Transmission Time Interval) applied to DL transmission and UL transmission between the radio base station and the user terminal is set to 1 ms and controlled.
- the transmission time interval is also called a transmission time interval, and the TTI in the LTE system (Rel. 8-12) is also called a subframe length.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- M2M may be referred to as D2D (Device To Device), V2V (Vehicular To Vehicular), or the like depending on a device to communicate. Designing a new communication access method (New RAT (Radio Access Technology)) is being studied in order to satisfy the above-mentioned various communication requirements.
- New RAT Radio Access Technology
- TTI Transmission Time Interval
- LTE Rel. 8-12 LTE Rel. 8-12
- the present invention has been made in view of the above points, and an object thereof is to provide a user terminal and a wireless communication method capable of appropriately performing communication even when a shortened TTI is applied. .
- One aspect of the user terminal of the present invention is a user terminal that performs communication using a first transmission time interval (TTI) and a second TTI having a TTI length shorter than the first TTI.
- a receiving unit that receives first downlink control information transmitted from the radio base station for each first TTI and second downlink control information transmitted by the second TTI, and a predetermined condition.
- a control unit that controls simultaneous reception of the first downlink data based on the first downlink control information and the second downlink data based on the second downlink control information on the same carrier.
- communication can be performed appropriately even when a shortened TTI is applied.
- TTI transmission time interval
- Rel.8-12 existing LTE system
- 3A and 3B are diagrams illustrating a configuration example of the shortened TTI.
- 6A and 6B are diagrams illustrating an example of PDSCH and sPDSCH allocation.
- FIG. 7A to FIG. 7C are diagrams illustrating other examples of user terminal operations when PDSCH and sPDSCH are scheduled simultaneously.
- FIG. 8A and 8B are diagrams illustrating another example of user terminal operations when PDSCH and sPDSCH are scheduled simultaneously.
- 9A and 9B are diagrams illustrating an example of retransmission control when PDSCH and sPDSCH are scheduled simultaneously. It is a figure which shows an example of allocation of PUSCH and sPUSCH.
- FIG. 11A to FIG. 11F are diagrams illustrating an example of a blind combination method of PDCCH and sPDCCH. It is a schematic block diagram which shows an example of schematic structure of the radio
- FIG. 1 is an explanatory diagram of an example of a transmission time interval (TTI) in the existing system (LTE Rel. 8-12).
- TTI transmission time interval
- LTE Rel. 8-12 LTE Rel.
- the TTI in 8-12 (hereinafter referred to as “normal TTI”) has a time length of 1 ms.
- a normal TTI is also called a subframe and is composed of two time slots.
- TTI is a transmission time unit of one channel-coded data packet (transport block), 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
- wireless interfaces suitable for high frequency bands such as tens of GHz, IoT (Internet of Things), MTC (Machine Type Communication), M2M (Machine To Machine) Wireless interfaces that minimize delay are desired for D2D (Device To Device) and V2V (Vehicular To Vehicular) services.
- FIG. 2 shows a cell (CC # 1) that uses a normal TTI (1 ms) and a cell (CC # 2) that uses a shortened TTI. Further, when using a shortened TTI, it is conceivable to change the subcarrier interval from the subcarrier of the normal TTI (for example, increase the subcarrier interval).
- shortened TTI When using a TTI having a time length shorter than a normal TTI (hereinafter referred to as “shortened TTI”), a time margin for processing (for example, encoding, decoding, etc.) in a user terminal or a radio base station increases, and therefore processing delay Can be reduced. Further, when the shortened TTI is used, the number of user terminals that can be accommodated per unit time (for example, 1 ms) can be increased.
- the configuration of the shortened TTI will be described.
- the shortened TTI has a time length (TTI length) smaller than 1 ms.
- the shortened TTI may be one or a plurality of TTI lengths with a multiple of 1 ms, such as 0.5 ms, 0.25 ms, 0.2 ms, and 0.1 ms.
- the normal TTI since the normal TTI includes 14 symbols, one of the TTI lengths that is an integral multiple of 1/14 ms such as 7/14 ms, 4/14 ms, 3/14 ms, 2/14 ms, 1/14 ms, Or it may be plural.
- a normal TTI since a normal TTI includes 12 symbols, it is one of TTI lengths that are integral multiples of 1/12 ms such as 6/12 ms, 4/12 ms, 3/12 ms, 2/12 ms, and 1/12 ms. Or it may be plural.
- 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.
- the shortened TTI only needs to have a shorter time length than the normal TTI, and may have any configuration such as the number of symbols, the symbol length, and the CP length in the shortened TTI.
- an OFDM symbol is used for DL and an SC-FDMA symbol is used for UL will be described, but the present invention is not limited to this.
- FIG. 3A is a diagram illustrating a first configuration example of the shortened TTI.
- the physical layer signal configuration (RE arrangement, etc.) of normal TTI 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. 3A 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. 3B is a diagram illustrating a second configuration example of the shortened TTI.
- the shortened TTI can be configured in units of symbols in the normal TTI (a configuration in which the number of symbols is reduced).
- a shortened TTI can be configured by using a part of 14 symbols included in one subframe.
- the shortened TTI is composed of 7 OFDM symbols (SC-FDMA symbols), which is half of the normal TTI.
- 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 can be frequency-multiplexed in the same system band (or carrier, cell, CC), and the compatibility with the normal TTI is maintained. it can.
- 5G wireless communication it is also conceivable to operate a plurality of services having different neurology (for example, different TTI lengths to be applied) on the same carrier in order to effectively use the frequency.
- a New RAT carrier frequency, cell, CC, etc.
- user terminals for example, user terminals using MBB, IoT, URLLC, etc.
- the user terminal receives DL scheduling control information as downlink control information transmitted in units of normal TTIs (subframes) and downlink control information transmitted in units of shortened TTIs.
- downlink control information that is normally transmitted in units of TTI may be referred to as first DCI, Slow-DCI, or long period DCI.
- downlink control information transmitted in units of shortened TTI may be called sDCI, second DCI, Fast-DCI, short period DCI, or shortened DCI.
- the downlink control information normally transmitted in TTI units may be configured to use downlink control information (or existing DCI allocation area and transmission timing) of an existing LTE system (before Rel. 12).
- downlink control information normally transmitted by TTI can be transmitted using an existing downlink control channel (PDCCH and / or EPDCCH).
- the downlink control information transmitted by shortened TTI can be transmitted using a shortened downlink control channel (sPDCCH).
- FIG. 4 shows a case where seven shortened TTIs (sTTI) are set in one subframe. Moreover, the case where sPDCCH is set for every sTTI is shown. Note that FIG. 4 shows a case where sPDCCH is not set in sTTI located at the beginning of a subframe, but sPDCCH may be set in sTTI.
- the radio base station can schedule a data channel (Unicast PDSCH) specific to the user terminal in units of subframes using an existing downlink control channel (for example, PDCCH).
- the radio base station can schedule a user terminal-specific data channel (Unicast sPDSCH) in units of sTTI using a downlink control channel for shortened TTI (for example, sPDCCH).
- the radio base station when data (for example, PDSCH) requiring delay reduction occurs in the middle of a subframe, the radio base station performs scheduling of the data using sPDCCH transmitted by sTTI (see FIG. 4).
- sPDCCH transmitted by sTTI
- the radio base station schedules data (for example, existing PDSCH) on the existing PDCCH over the subframe, simultaneous transmission of sPDSCH and PDSCH occurs in the subframe.
- PDSCH and sPDSCH assignments overlap in the 4sTTI period of the subframe. In this case, there is a problem of how to control reception processing at the user terminal and / or transmission processing (resource allocation or the like) at the radio base station.
- the present inventors pay attention to the possibility that simultaneous transmission (simultaneous allocation) of PDSCH and sPDSCH may occur in the same carrier and the same subframe, and the simultaneous PDSCH and sPDSCH depending on the user terminal capability and / or predetermined conditions. Found to control transmission.
- downlink data PDSCH
- PDCCH normal TTI downlink control information
- sPDCCH downlink TTI downlink control information
- the present inventors as the user terminal capability and / or based on predetermined conditions, uplink data (PUSCH) based on normal TTI downlink control information (PDCCH) and downlink TTI downlink control The idea was to control simultaneous transmission of uplink data (sPUSCH) based on information (sPDCCH) in the same carrier and the same subframe.
- PUSCH uplink data
- sPDCCH information
- a TTI having a TTI length shorter than 1 ms is referred to as a shortened TTI, but may be referred to as a short TTI, a shortened subframe, or a short subframe.
- a TTI of 1 ms is called a normal TTI, but may be called a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- the configuration shown in FIGS. 1 to 3 can be applied to the shortened TTI of the present embodiment.
- PDSCH downlink data
- PUSCH uplink data
- sTTI downlink control channels
- signals (or channels) to which this embodiment can be applied are not limited to data (or data channels).
- the present invention can be similarly applied to transmission of a signal whose transmission is controlled by normal TTI and a signal whose transmission is controlled by sTTI.
- this embodiment can be applied to user terminals that can communicate using at least different TTI lengths.
- an LTE system is taken as an example, but the present embodiment is not limited to this, and any system that uses a shortened TTI can be applied.
- a plurality of modes described below may be implemented alone or in combination as appropriate.
- the radio base station transmits a PDSCH and an sPDSCH to a user terminal having a user capability of simultaneously receiving a PDSCH for normal TTI and an sPDSCH for shortened TTI and / or a user terminal having an unknown user capability.
- Schedule at the same time. For example, in a subframe that schedules a PDSCH for normal TTI, when a sudden data (for example, delay reduction traffic) occurs in the middle of the subframe, the radio base station uses a predetermined shortened TTI included in the subframe. Schedule sPDSCH.
- the user terminal performs reception processing (for example, decoding processing) for both PDSCH and sPDSCH when the predetermined condition (condition X) is satisfied, and reception processing is performed for only one of the terminals when the condition X is not satisfied.
- reception processing for example, decoding processing
- condition X the predetermined condition
- the user terminal always performs reception processing on only one of PDSCH and sPDSCH based on a predetermined condition
- second method the user terminal autonomously determines whether to perform reception processing for both PDSCH and sPDSCH, or to perform reception processing for only one of them (third method).
- FIG. 5 is a diagram illustrating an example of a user operation when the first method is applied.
- the user terminal determines whether or not a predetermined condition (condition X) is satisfied (ST102).
- condition X a predetermined condition
- the user terminal can determine the allocation of PDSCH and sPDSCH by performing reception processing (for example, blind decoding) on PDCCH and sPDCCH.
- the user terminal When the condition X is satisfied, the user terminal (UE # 1) performs reception processing (simultaneous reception) on the PDSCH and the sPDSCH (see ST103, FIG. 6A). On the other hand, when the condition X is not satisfied, the user terminal performs reception processing on one of PDSCH and sPDSCH based on a predetermined rule (ST104). At this time, the user terminal may be controlled to receive at least one of the PDSCH and the sPDSCH during at least the overlapping period (for example, the sTTI period to which the sPDSCH is allocated).
- Predetermined conditions (condition X) to be considered in ST102 are: PDSCH type (or use), PDCCH type (or use), PDSCH transport block size (TBS), and / or modulation and coding scheme (MCS) , PDSCH TBS and sPDSCH TBS. Also, some or all of these conditions may be set together. Alternatively, other conditions may be set.
- the user terminal determines that the condition X is satisfied and performs simultaneous reception on the PDSCH and the sPDSCH.
- SPS refers to an operation in which a radio base station apparatus allocates a PDSCH to a user terminal fixedly at a predetermined period, starting from a subframe (assignment start time) in which downlink scheduling information is transmitted to the user terminal via the PDCCH. .
- SPS is used for voice data (VoIP) and the like.
- the user terminal can determine that the condition X is satisfied and perform simultaneous reception on the PDSCH and the sPDSCH. For example, when the PDCCH normally transmitted by TTI is the PDCCH that schedules message 0 or message 2 in the random access procedure, both the PDSCH scheduled by the PDCCH and the sPDSCH scheduled by the sPDCCH of the shortened TTI are received. .
- the random access procedure is an operation used for initial connection, synchronization establishment, or communication resumption, and the signal related to the random access procedure is a signal that is more important for the user terminal than normal DL data reception. Therefore, when PDCCH (and / or PDSCH) is used for a random access procedure, it is preferable to determine that the condition X is satisfied and perform simultaneous reception of PDSCH and sPDSCH. Thereby, it is possible to suppress the deterioration of communication quality and reduce the delay.
- PDSCH of TBS is a predetermined threshold value (e.g., the first threshold) or less
- / or PDSCH of MCS MCS_ PDSCH
- MCS_ PDSCH is a predetermined threshold value (for example, a second threshold value)
- the number of received bits by the user terminal to manage, control and store the PDSCH in simultaneously received soft buffer size
- the simultaneous reception of the PDSCH and the sPDSCH can be controlled without exceeding the above.
- the MSCH of the PDSCH when MCS_PDSCH is equal to or less than a predetermined threshold
- the simultaneous reception of PDSCH and sPDSCH can be controlled without exceeding the buffer size (also referred to as buffer size).
- the sPDSCH TBS in addition to the PDSCH TBS, the PDSCH is managed so as not to exceed the number of received bits (also referred to as a soft buffer size) for managing, controlling, and storing both the PDSCH and the sPDSCH.
- sPDSCH can be controlled simultaneously.
- the user terminal can obtain parameters (scheduling information such as MCS and RB allocation) for determining whether or not the condition X is satisfied from the PDCCH and / or sPDCCH. That is, in each subframe, the user terminal performs reception processing (for example, blind decoding) on PDCCH and sPDCCH, and determines that the condition X is satisfied, performs simultaneous reception on PDSCH and sPDSCH. On the other hand, when the user terminal determines that the condition X is not satisfied, the user terminal performs a reception process on one of PDSCH and sPDSCH.
- reception processing for example, blind decoding
- the user terminal may perform sPDCCH reception processing (for example, blind decoding) in each subframe, or may be configured to perform only in a predetermined subframe defined in advance.
- sPDCCH reception processing for example, blind decoding
- TDD Frequency Division Duplex
- reception processing of sPDCCH may be performed only in the downlink subframe, and the downlink symbol, the guard interval, and the uplink symbol are the same subframe compared to the downlink subframe.
- the sPDCCH reception process may also be performed in a special subframe included therein. When the sPDCCH reception process is performed only in the downlink subframe, the processing load on the terminal can be reduced and the battery consumption can be suppressed.
- the predetermined subframe may be fixedly defined in the specification, or may be configured to be notified from the radio base station to the user terminal by higher layer signaling and / or PDCCH.
- the user terminal when the user terminal performs simultaneous reception of PDSCH and sPDSCH (for example, when the condition X is satisfied), it is preferable to set the PDSCH allocation area (allocation resource) and the sPDSCH allocation area so that they do not overlap.
- a radio base station allocates PDSCH resources and sPDSCH resources redundantly to a certain user terminal (for example, UE # 1) (see FIG. 6B).
- the radio base station assigns sPDSCH to a resource overlapping with the PDSCH to be assigned to the user terminal.
- the user terminal may not be able to receive DL data appropriately in the overlapping part of PDSCH and sPDSCH.
- the radio base station can set the PDSCH resource and the sPDSCH resource so as not to overlap (see FIG. 6A). ).
- FIG. 7A is a diagram illustrating an example of a user operation when the second method is applied.
- the user terminal performs reception processing on one of PDSCH and sPDSCH based on a predetermined rule (ST111).
- the second method can also be applied to the user terminal operation (for example, ST104 in FIG. 5) when the predetermined condition (condition X) is not satisfied in the first method.
- the user terminal can always perform control so as not to perform (skip or interrupt) one of the reception processes when PDSCH and sPDSCH are simultaneously scheduled in the same subframe (see FIG. 7B).
- FIG. 7B shows a case where the user terminal always decodes sPDSCH without decoding PDSCH when PDSCH and sPDSCH are simultaneously scheduled in the same subframe.
- the delay required in the system can be suppressed by giving priority to the reception processing for sPDSCH.
- the PDSCH resource and the sPDSCH resource may be set in an overlapping manner (see FIG. 7C). Thereby, the radio base station can flexibly set PDSCH and sPDSCH resource allocation.
- the user terminal may prioritize reception of PDSCH over sPDSCH according to the type (or use) of PDSCH and / or PDCCH. For example, when the PDSCH (and / or PDCCH) is used for the random access procedure, the user terminal controls the PDSCH to be decoded and not to receive (skip or interrupt) the sPDSCH.
- FIG. 8A is a diagram illustrating an example of a user operation when the third method is applied.
- the user terminal autonomously determines whether to perform reception processing for both PDSCH and sPDSCH or only one of them. (ST121). That is, it may be determined that the user terminal side performs simultaneous reception on PDSCH and sPDSCH, or may determine that reception processing is performed on one of PDSCH and sPDSCH.
- the radio base station cannot grasp how the user terminal has determined. In other words, there is no common recognition about the PDSCH and sPDSCH reception method between the radio base station and the user terminal. Therefore, when the user terminal determines that both PDSCH and sPDSCH are scheduled based on the PDCCH and sPDCCH reception processing results for scheduling both PDSCH and sPDSCH even if neither or both reception processes are performed.
- the acknowledgment signal (HARQ-ACK, ACK / NACK) may be fed back.
- the radio base station can determine the reception method selected by the user terminal based on the delivery confirmation signal (HARQ-ACK, ACK / NACK) for PDSCH and sPDSCH fed back from the user terminal (FIG. 8B). reference).
- the delivery confirmation signal HARQ-ACK, ACK / NACK
- the radio base station determines that the user terminal has performed reception processing for both sPDSCH and PDSCH.
- the radio base station determines that the user terminal has performed reception processing for at least sPDSCH. On the other hand, the radio base station cannot determine whether the user terminal has failed to receive PDSCH or has not performed PDSCH reception processing (skip or interrupted). In such a case, the radio base station may retransmit the PDSCH (for example, as RV0) to the user terminal for safety. Thereby, when the user terminal has failed to receive the PDSCH, the user terminal can receive the retransmitted data.
- the PDSCH for example, as RV0
- the radio base station determines that the user terminal has performed at least reception processing for PDSCH. On the other hand, the radio base station cannot determine whether the user terminal has failed to receive the sPDSCH or has not performed the sPDSCH reception process (skip or interrupted). In such a case, the radio base station may retransmit the sPDSCH (for example, as RV0) to the user terminal for safety.
- the radio base station may determine whether the user terminal has failed to receive sPDSCH and PDSCH or has not performed reception processing (skip or interrupted) Can not. In such a case, the radio base station may retransmit the sPDSCH and PDSCH (for example, as RV0) to the user terminal for safety.
- the user terminal can feed back the delivery confirmation signal for sPDSCH and the delivery confirmation signal for PDSCH at different timings. For example, the user terminal feeds back an acknowledgment signal for sPDSCH after a first predetermined period (for example, 4 sTTI) after receiving sPDSCH. Further, the user terminal can feed back a delivery confirmation signal for the PDSCH after a second predetermined period (for example, 4 subframes) after receiving the PDSCH (see FIG. 9A).
- a first predetermined period for example, 4 sTTI
- a delivery confirmation signal for the PDSCH after a second predetermined period (for example, 4 subframes) after receiving the PDSCH (see FIG. 9A).
- the radio base station can perform retransmission of sPDSCH and retransmission of PDSCH at different timings based on the delivery confirmation signal fed back from the user terminal. For example, the radio base station retransmits the sPDSCH after a third predetermined period (for example, 4 sTTI) after receiving the sPDSCH delivery confirmation signal (for example, NACK) (see FIG. 9B). The radio base station retransmits the PDSCH after a fourth predetermined period (for example, 4 subframes) after receiving the PDSCH delivery confirmation signal (for example, NACK).
- a third predetermined period for example, 4 sTTI
- NACK sPDSCH delivery confirmation signal
- the radio base station may set the PDSCH allocation area and the sPDSCH allocation area so as not to overlap in consideration of the possibility that the user terminal simultaneously receives PDSCH and sPDSCH. Good.
- the user terminal notifies the radio base station of user capability information (UE Capability) regarding the capability of simultaneous reception of PDSCH and sPDSCH in the same carrier and the same subframe.
- UE Capability user capability information
- the radio base station controls scheduling of PDSCH and sPDSCH based on user capability information notified from the user terminal.
- the radio base station can allocate PDSCH and sPDSCH to the same subframe in the same carrier for the user terminal.
- the radio base station preferably allocates the PDSCH resource and the sPDSCH resource so that they do not overlap (see FIG. 6A).
- the radio base station can control the user terminal so that PDSCH and sPDSCH are not allocated to the same subframe in the same carrier.
- the radio base station may transmit sPDSCH instead of PDSCH when urgent data is generated in the middle of a subframe for scheduling PDSCH.
- the radio base station may control the allocation by allowing duplication of PDSCH resources and sPDSCH resources (see FIG. 7C). Further, the radio base station may perform retransmission control assuming that the user terminal receives sPDSCH preferentially.
- the radio base station can control scheduling of PDSCH and sPDSCH assuming that the user terminal supports the simultaneous reception capability. it can.
- the radio base station may control scheduling on the assumption that the user terminal does not support the simultaneous reception capability. In any case, since the user terminal having or not having the simultaneous reception capability does not need to notify the user capability information, the signaling overhead can be reduced.
- the radio base station provides a user terminal having a user capability of performing simultaneous transmission (or time division (TDM) transmission) of PUSCH and sPUSCH in the same subframe and / or a user terminal having an unknown user capability.
- transmission of PUSCH and sPUSCH is scheduled simultaneously. For example, when urgent data (for example, delay reduction traffic) occurs in a subframe for scheduling PUSCH, the radio base station schedules transmission of sPUSCH with a predetermined shortened TTI included in the subframe.
- the transmission of sPUSCH may be collision-type UL data transmission that is transmitted from the user terminal without the UL grant (sPDCCH) from the radio base station.
- the user terminal can transmit the sPUSCH that is not based on the UL grant even when the sTTI is in the middle of the subframe at the stage when the urgent data (traffic) is generated.
- the user terminal performs transmission processing (for example, transmission after code processing) for both PUSCH and sPUSCH when the predetermined condition (condition Y) is satisfied, and for either one when condition Y is not satisfied Only the transmission process is performed (first method).
- a user terminal always performs a transmission process only to one of PUSCH and sPUSCH based on a predetermined condition (second method).
- a user terminal determines autonomously whether to perform the transmission process with respect to both PUSCH and sPUSCH, or to perform a transmission process only with respect to any one (3rd method).
- the user terminal determines whether or not a predetermined condition (condition Y) is satisfied when PUSCH and sPUSCH are scheduled simultaneously.
- the user terminal can determine the assignment of PUSCH and sPUSCH by performing reception processing (for example, blind decoding) on PDCCH and sPDCCH.
- the sPUSCH may be a collision type UL data transmission that is transmitted without a UL grant from the radio base station.
- the user terminal When the condition Y is satisfied, the user terminal performs PUSCH and sPUSCH transmission processing (simultaneous transmission) in the same subframe. At this time, the user terminal may control to transmit only sPUSCH by applying time division multiplexing (TDM) in at least an overlap period of PUSCH and sPUSCH (for example, sTTI period in which sPUSCH is transmitted) (FIG. 10). reference).
- TDM time division multiplexing
- PUSCH and sPUSCH are transmitted in the same subframe, the PUSCH and sPUSCH are time-multiplexed and transmitted, so that the single carrier characteristics of UL transmission can be maintained and the deterioration of communication quality can be suppressed.
- the user terminal performs a transmission process on one of PUSCH and sPUSCH based on a predetermined rule.
- the predetermined condition (condition Y) includes PUSCH and sPUSCH resource allocation, PUSCH type (or usage, included information, etc.), PUCCH type (or usage, included information, etc.), PUSCH transport block size ( TBS) and / or modulation and coding scheme (MCS), PUSCH TBS and sPUSCH TBS. Also, some or all of these conditions may be set together.
- the user terminal determines that the condition Y is satisfied and applied TDM to PUSCH and sPUSCH in the same subframe. Send.
- SPS refers to an operation in which a radio base station apparatus allocates a PUSCH to a user terminal fixedly at a predetermined period, starting from a subframe (assignment start time) in which uplink scheduling information is transmitted to the user terminal via the PDCCH. .
- the user terminal determines that the condition Y is not satisfied and transmits the PUSCH (sPUSCH is not TDM within the same subframe and dropped. Can send.
- the PDCCH transmitted in the normal TTI is the PDCCH that schedules the message 3 in the random access procedure
- the PUSCH scheduled in the PDCCH is transmitted, and in the transmission time section of the PUSCH, the PDCCH is scheduled in the sPDCCH of the shortened TTI. Drop sPUSCH.
- the random access procedure is an operation used at the time of initial connection, synchronization establishment, communication resumption, and the like, and is a process having a higher importance for the user terminal as compared with normal UL data reception. Therefore, when PDCCH (and / or PUSCH) is used for a random access procedure, it is determined that the condition Y is not satisfied, and PUSCH transmission is preferentially performed to increase the success probability of the random access procedure. Can do.
- the user terminal the PUSCH TBS (tbs_ PUSCH) is a predetermined threshold value (e.g., the first threshold) or less, and / or a PUSCH MCS (MCS_ PUSCH) is a predetermined threshold value (for example, a second threshold value) It may be determined that the condition Y is satisfied if:
- the transmission of the PUSCH and sPUSCH in the same sub-frame e.g., TDM transmission
- TDM Simultaneous
- the number of transmission bits (software) for the user terminal to manage, control, and store the PUSCH by transmitting the PUSCH and the sPUSCH in the same subframe
- the simultaneous (TDM) transmission of PUSCH and sPUSCH can be controlled without exceeding the buffer size (also referred to as buffer size).
- the user terminal PUSCH of TBS total predetermined threshold (tbs_ PUSCH) and SPUSCH of TBS (TBS_ sPUSCH) (e.g., a third threshold value) if less, it may be determined to satisfy the condition Y .
- the sPUSCH TBS is also taken into consideration so that the user terminal does not exceed the number of transmission bits (also referred to as a soft buffer size) that manages, controls, and stores both the PUSCH and the sPUSCH.
- simultaneous (TDM) transmission of PUSCH and sPUSCH can be controlled.
- the user terminal can acquire parameters (scheduling information such as MCS and RB allocation) for determining whether the condition Y is satisfied from the PDCCH and / or sPDCCH. That is, the user terminal performs reception processing on the PDCCH and the sPDCCH in each subframe, and when it is determined that the condition Y is satisfied, transmits the PUSCH and the sPUSCH in the same subframe (for example, TDM transmission). . On the other hand, when the user terminal determines that the condition Y is not satisfied, the user terminal performs a transmission process on one of PUSCH and sPUSCH in the same subframe.
- the condition Y may be set similarly to the condition X described above.
- the user terminal transmits PUSCH and sPUSCH in the same subframe (for example, when the condition X is satisfied)
- the PUSCH allocation area (allocation resource) and the sPUSCH allocation area may be set not to overlap. Preferred (see FIG. 10).
- PUSCH resources and sPUSCH resources may be set to be multiplexed in the frequency domain.
- PUSCH and sPUSCH resource allocation can be flexibly performed.
- the user terminal performs a transmission process on one of the PUSCH and the sPUSCH based on a predetermined rule.
- the second method can also be applied to the user terminal operation when the predetermined condition (condition Y) is not satisfied in the first method.
- the user terminal can always perform control so that either one (for example, PUSCH) is not transmitted (skip or interrupted).
- uplink data (sPUSCH) allocated by shortened TTI is often data that requires delay reduction, it is possible to suppress delay required by the system by prioritizing transmission processing for sPUSCH. Further, when the user terminal transmits only one of PUSCH and sPUSCH in the same subframe, the PUSCH resource and the sPUSCH resource may be set to overlap. Thereby, the radio base station can flexibly set the resource allocation of PUSCH and sPUSCH.
- the user terminal may prioritize the PUSCH reception over the sPUSCH according to the type of PUSCH and / or PDCCH (or usage, information included, etc.). For example, when PUSCH (and / or PDCCH) is used for a random access procedure, control is performed such that PUSCH is encoded and transmitted and sPUSCH is not transmitted (skip or interrupted).
- the user terminal autonomously determines whether to perform transmission processing for both PUSCH and sPUSCH in the same subframe, or to perform transmission processing for only one of them. To decide. That is, on the user terminal side, it may be determined that transmission of PUSCH and sPUSCH (for example, TDM transmission 9 is performed in the same subframe, or transmission processing for either PUSCH or sPUSCH is performed. .
- the radio base station cannot grasp how the user terminal has determined. In other words, the wireless base station and the user terminal are in a state where there is no common recognition regarding the PUSCH and sPUSCH reception methods.
- the radio base station can determine the reception method selected by the user terminal based on the PUSCH and sPUSCH transmitted from the user terminal.
- the user terminal notifies the radio base station of user capability information regarding the number of times of blind decoding, and the radio base station controls allocation of PDCCH and sPDCCH based on the user capability information.
- the user capability information may relate to the number of times of blind decoding per user terminal, or may be per component carrier used by the user terminal for communication.
- the number of decoding times allowed for the user terminal (for example, the upper limit value for each subframe and / or sTTI, the number of times for each subframe and / or each sTTI, etc.) is set in advance, and the radio base station is set to a preset value.
- the assignment of PDCCH and sPDCCH may be controlled based on the above.
- the user terminal notifies the radio base station of user capability information regarding the number of times of decoding (the total number of times of decoding for PDCCH and sPDCCH) that can be performed in each subframe.
- the radio base station controls allocation of PDCCH and / or sPDCCH so that the number of decoding times of PDCCH and sPDCCH in the subframe does not exceed the user capability.
- the number of decoding times of PDCCH in one subframe may be set to be smaller than a value (for example, 32 or 48 times) defined in the existing system according to the configuration of sPDCCH (for example, the number of times of decoding of sPDCCH).
- a value for example, 32 or 48 times
- the number of decoding times of the user terminal in one subframe is set to a value that does not exceed the maximum number of existing systems. Thereby, it can suppress that the load of a user terminal increases.
- the user terminal may notify the radio base station of the number of decodings that can be performed on the sPDCCH in one subframe as user capability information. Based on the user capability information, the radio base station controls allocation of sPDCCH so that the number of decoding times of each sPDCCH does not exceed the user capability.
- the number of times of decoding of PDCCH in one subframe can be set in the same manner as the value (for example, 32 or 48 times) defined in the existing system. it can.
- decoding of PDCCH can be controlled in the same way as existing, and allocation of downlink control information can be flexibly controlled by separately setting the number of decoding for newly added sPDCCH.
- FIG. 11 shows an example of a method for setting the number of times of blind decoding for PDCCH and sPDCCH.
- the maximum value (user terminal capability) of PDCCH and sPDCCH decoding times for the UE-specific search space of each subframe is 48 times.
- the radio base station sets the PDCCH and sPDCCH configuration so that the total number of PDCCH and sPDCCH decoding times in the UE-specific search space for each subframe does not exceed 48 times.
- FIGS. 11B, 11D, and 11E show a case where two TTIs are included in a subframe.
- the number of decoding times of each sPDCCH can be set smaller than the number of decoding times of PDCCH.
- the number of times of decoding of each sPDCCH may be set to be equal to the number of times of decoding of PDCCH.
- the PDCCH decoding count may be an existing decoding count (for example, 32), and the remaining decoding count may be set for each sPDCCH.
- 11A to 11D show a case where the number of decoding times of each sPDCCH is equalized, but the present invention is not limited to this. You may set so that the frequency
- the user terminal can appropriately decode PDCCH and sPDCCH.
- 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. 12 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), NR (New Rat), or the like.
- the radio communication system 1 shown in FIG. 12 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. In addition, it can be set as the structure by which the TDD carrier which applies shortening TTI is contained in either of several cells.
- 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 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.
- 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.
- DL channels DL data channels (PDSCH: Physical Downlink Shared Channel, also referred to as DL shared channel) shared by each user terminal 20, broadcast channels (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 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.
- a UL data channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL shared 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 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. 13 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.
- the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
- DL data transmitted from the radio base station 10 to the user terminal 20 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 transmission processing
- scheduling for example, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing
- IFFT Inverse Fast Fourier Transform
- precoding processing precoding processing
- other transmission processing are performed and the transmission / reception unit 103.
- the DL control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device which is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the UL signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- the transmission / reception unit 103 includes a DL signal (for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal. , Synchronization signals, broadcast signals, etc.) and UL signals (eg, UL control signals (UL control channel), UL data signals (UL data channel, UL shared channel), UL reference signals, etc.) are received.
- DL signal for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.
- DM-RS DL reference signal
- CSI-RS CSI-RS
- the transmission / reception unit 103 receives first downlink control information (PDCCH) transmitted for each first TTI and second downlink control information (sPDCCH) transmitted by the second TTI. Send.
- the transmission / reception unit 103 receives first downlink data (PDSCH) scheduled with the first downlink control information (PDCCH) and second downlink data (sPDSCH) scheduled with the second downlink control information (sPDCCH). Transmit in the same carrier and / or the same subframe.
- the transmission / reception unit 103 receives user capability information regarding applicability of simultaneous reception on the same carrier of PDSCH and sPDSCH. Alternatively, the transmission / reception unit 103 receives user capability information regarding the number of times of decoding (for example, the number of times of blind decoding) applicable to detection of PDCCH and / or sPDCCH. Further, the transmission / reception unit 103 simultaneously receives the first uplink data (PUSCH) and the second uplink data (sPUSCH) in the same carrier and / or the same subframe.
- PUSCH first uplink data
- sPUSCH second uplink data
- the transmission unit and the reception unit of the present invention are configured by the transmission / reception unit 103 and / or the transmission path interface 106.
- FIG. 14 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 14 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 14, the baseband signal processing unit 104 includes at least 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 part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
- the control unit 301 controls signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example.
- the control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
- the control unit 301 controls scheduling (for example, resource allocation) of DL signals and / or UL signals. Specifically, the control unit 301 generates and transmits a DCI (DL assignment) including scheduling information of the DL data channel and a DCI (UL grant) including scheduling information of the UL data channel. 302, the mapping unit 303, and the transmission / reception unit 103 are controlled.
- a DCI DL assignment
- a DCI UL grant
- the control unit 301 uses the first downlink data (PDSCH) based on the first downlink control information (PDCCH) and the second downlink data (sPDSCH) based on the second downlink control information (sPDCCH) in the same carrier.
- PDSCH first downlink data
- sPDSCH second downlink data
- sPDCCH second downlink control information
- the control unit 301 controls allocation so that the PDSCH resource and the sPDSCH resource do not overlap (FIG. 6A).
- the control unit 301 may perform assignment so that the PDSCH resource and the sPDSCH resource overlap (see FIG. 7B).
- control unit 301 can determine the reception method of the user terminal based on HARQ-ACK for the PDSCH and sPDSCH (see FIG. 8B). .
- the transmission signal generation unit 302 generates a DL signal (DL reference signal such as DL control channel, DL data channel, DM-RS, etc.) 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 configured by 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 configured by 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 reception signal input from the transmission / reception unit 103.
- the received signal is, for example, a UL signal (UL control channel, UL data channel, UL reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 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.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301.
- the reception processing unit 304 outputs at least one of a preamble, control information, and UL data to the control unit 301.
- the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
- 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 may measure, for example, received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 301.
- FIG. 15 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, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception 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 transmission / reception unit 203 can be configured by 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.
- 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.
- 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. Of the DL data, system information and higher layer control information are 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 transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 includes a DL signal (for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal.
- a DL signal for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal.
- a UL signal for example, UL control signal (UL control channel), UL data signal (UL data channel, UL shared channel), UL reference signal, etc.
- the transmission / reception unit 203 receives the first downlink control information (PDCCH) transmitted for each first TTI and the second downlink control information (sPDCCH) transmitted by the second TTI. Receive.
- the transmission / reception unit 203 includes first downlink data (PDSCH) scheduled with the first downlink control information (PDCCH) and second downlink data (sPDSCH) scheduled with the second downlink control information (sPDCCH). ) In the same carrier and / or the same subframe.
- the transmission / reception unit 203 transmits user capability information regarding applicability of simultaneous reception on the same carrier of PDSCH and sPDSCH. Or the transmission / reception part 203 transmits the user capability information regarding the frequency
- count of decoding for example, the frequency
- FIG. 16 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 16 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 illustrated in FIG. 16, 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. At least.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403.
- the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
- the control unit 401 acquires the DL control channel and the DL data channel transmitted from the radio base station 10 from the received signal processing unit 404. Specifically, the control unit 401 performs blind decoding on the DL control channel to detect DCI and / or sDCI and receives the DL data channel based on the DCI and / or sDCI, and the transmission / reception unit 203 and received signal processing The unit 404 is controlled. Further, the control unit 401 estimates the channel gain based on the DL reference signal, and demodulates the DL data channel based on the estimated channel gain.
- the control unit 401 controls transmission of retransmission control information (for example, HARQ-ACK) transmitted on the UL control channel or the UL data channel based on the result of determining whether or not retransmission control is required for the DL data channel. May be. Moreover, the control part 401 may control transmission of the channel state information (CSI: Channel State Information) generated based on the DL reference signal.
- CSI Channel State Information
- the control unit 401 based on a predetermined condition, the first downlink data (PDSCH) based on the first downlink control information (PDCCH) and the second downlink data based on the second downlink control information (sPDCCH) ( sPDSCH) on the same carrier is controlled (see FIGS. 5 and 6).
- the predetermined condition may be at least one of a PDSCH type, a PDCCH type, a PDSCH and / or sPDSCH TBS, and a PDSCH and / or sPDSCH MCS.
- control unit 401 can control the simultaneous transmission of the first uplink data (PUSCH) and the second uplink data (sPUSCH) in the first carrier within the first TTI based on a predetermined condition ( (See FIG. 10).
- control unit 401 controls to notify the radio base station of capability information regarding applicability of simultaneous reception of PDSCH and sPDSCH on the same carrier.
- control unit 401 performs control so as to notify the radio base station of capability information regarding the number of times of decoding applicable to detection of PDCCH and / or sPDCCH.
- the control unit 401 can perform a reception process on either the PDSCH or the sPDSCH based on a predetermined rule (see FIG. 7A).
- the control unit 401 autonomously determines on the user terminal side whether to perform reception processing for both the PDSCH and sPDSCH or only one of them. (See FIG. 8A).
- the transmission signal generation unit 402 generates a UL signal (UL control channel, UL data channel, UL reference signal, etc.) based on an instruction from the control unit 401, and outputs the UL signal to the mapping unit 403.
- the transmission signal generation unit 402 can be configured by 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 transmission signal generation unit 402 generates a UL data channel based on an instruction from the control unit 401. For example, when the UL grant is included in the DL control channel notified from the radio base station 10, the transmission signal generation unit 402 is instructed by the control unit 401 to generate a UL data channel.
- 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 can be configured by 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 reception signal input from the transmission / reception unit 203.
- the received signal is, for example, a DL signal (DL control channel, DL data channel, DL reference signal, etc.) transmitted from the radio base station 10.
- the reception 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 received signal processing unit 404 performs blind decoding on the DL control channel that schedules transmission and / or reception of the DL data channel based on an instruction from the control unit 401, and performs DL data channel reception processing based on the DCI.
- Received signal processing section 404 estimates the channel gain based on DM-RS or CRS, and demodulates the DL data channel based on the estimated channel gain.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 may output the data decoding result to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 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 405 may measure, for example, the received power (for example, RSRP), DL reception quality (for example, RSRQ), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 401.
- 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. 17 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 these 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 transmitted / 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.
- the terms “connected”, “coupled”, or any variation thereof 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.
- 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 light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.
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Abstract
Description
短縮TTIの構成例について図3を参照して説明する。図3A及び図3Bに示すように、短縮TTIは、1msより小さい時間長(TTI長)を有する。短縮TTIは、例えば、0.5ms、0.25ms、0.2ms、0.1msなど、倍数が1msとなるTTI長の1つ又は複数であってもよい。あるいは、通常CPの場合に通常TTIは14シンボルを含むことから、7/14ms、4/14ms、3/14ms、2/14ms、1/14msなど1/14msの整数倍となるTTI長の1つまたは複数であってもよい。また、拡張CPの場合に通常TTIは12シンボルを含むことから、6/12ms、4/12ms、3/12ms、2/12ms、1/12msなど1/12msの整数倍となるTTI長の1つまたは複数であってもよい。
第1の態様では、通常TTI用の下りデータ(unicast PDSCH)と、短縮TTI用の下りデータ(unicast sPDSCH)が、同じキャリア(又は、セル、CC)の所定サブフレームにおいて同時にスケジューリングされる場合のユーザ動作の一例について説明する。以下の説明では、通常TTI(サブフレーム)単位で送信される下りデータを「PDSCH」、下り制御チャネルを「PDCCH」、短縮TTI(sTTI)単位で送信される下りデータを「sPDSCH」、下り制御チャネルを「sPDCCH」と記す。
図5は、第1の方法を適用する場合のユーザ動作の一例を示す図である。ユーザ端末は、PDSCHとsPDSCHが同時にスケジューリングされた場合(ST101)、所定条件(条件X)を満たすか否か判断する(ST102)。なお、ユーザ端末は、PDCCHとsPDCCHに対する受信処理(例えば、ブラインド復号)を行うことにより、PDSCHとsPDSCHの割当てを判断することができる。
図7Aは、第2の方法を適用する場合のユーザ動作の一例を示す図である。ユーザ端末は、PDSCHとsPDSCHが同時にスケジューリングされた場合(ST101)、所定規則に基づいてPDSCHとsPDSCHのいずれか一方に対する受信処理を行う(ST111)。なお、第2の方法は、第1の方法において、所定条件(条件X)を満たさない場合のユーザ端末動作(例えば、図5におけるST104)にも適用することができる。
図8Aは、第3の方法を適用する場合のユーザ動作の一例を示す図である。ユーザ端末は、PDSCHとsPDSCHが同時にスケジューリングされた場合(ST101)、PDSCHとsPDSCH両方に対する受信処理を行うか、いずれか一方に対してのみ受信処理を行うかを、ユーザ端末側で自律的に決定する(ST121)。つまり、ユーザ端末側で、PDSCHとsPDSCHに対する同時受信を行うと判断してもよいし、PDSCHとsPDSCHのいずれか一方に対する受信処理を行うと判断してもよい。
第2の態様では、ユーザ端末が同一キャリア・同一サブフレームにおいてPDSCHとsPDSCHの同時受信を行う能力に関するユーザ能力情報(UE Capability)を無線基地局に通知する場合について説明する。
第3の態様では、通常TTI用の上りデータ(unicast PUSCH)と、短縮TTI用の上りデータ(unicast sPUSCH)が、同じキャリア(又は、セル、CC)の所定サブフレームにおいて同時にスケジューリングされる場合のユーザ動作の一例について説明する。以下の説明では、通常TTI単位で送信される上りデータを「PUSCH」、短縮TTI単位で送信される上りデータを「sPUSCH」と記す。
第1の方法では、ユーザ端末は、PUSCHとsPUSCHが同時にスケジューリングされた場合、所定条件(条件Y)を満たすか否か判断する。ユーザ端末は、PDCCHとsPDCCHに対する受信処理(例えば、ブラインド復号)を行うことにより、PUSCHとsPUSCHの割当てを判断することができる。あるいは、sPUSCHは無線基地局からのULグラントなしで送信する衝突型ULデータ送信であってもよい。
第2の方法では、ユーザ端末は、PUSCHとsPUSCHが同時にスケジューリングされた場合、所定規則に基づいてPUSCHとsPUSCHのいずれか一方に対する送信処理を行う。なお、第2の方法は、第1の方法において、所定条件(条件Y)を満たさない場合のユーザ端末動作にも適用することができる。
第3の方法では、ユーザ端末は、PUSCHとsPUSCHが同時にスケジューリングされた場合、同一サブフレームにおいてPUSCHとsPUSCH両方に対する送信処理を行うか、いずれか一方に対してのみ送信処理を行うかを、自律的に決定する。つまり、ユーザ端末側で、同一サブフレームにおいてPUSCHとsPUSCHの送信(例えば、TDM送信9を行うと判断してもよいし、PUSCHとsPUSCHのいずれか一方に対する送信処理を行うと判断してもよい。
第4の態様では、ユーザ端末が1サブフレームにおいて検出(例えば、ブラインド復号)するPDCCHとsPDCCHの復号制御(例えば、復号回数)について説明する。
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13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ればよい。
図15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、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、送受信アンテナ201、アンプ部202、送受信部203は、それぞれ1つ以上を含むように構成されればよい。
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)
- 第1の送信時間間隔(TTI:Transmission Time Interval)と、前記第1のTTIよりTTI長が短い第2のTTIを利用して通信を行うユーザ端末であって、
無線基地局から第1のTTI毎に送信される第1の下り制御情報と、第2のTTIで送信される第2の下り制御情報と、を受信する受信部と、
所定条件に基づいて前記第1の下り制御情報に基づく第1の下りデータと、前記第2の下り制御情報に基づく第2の下りデータの同一キャリアにおける同時受信を制御する制御部と、を有することを特徴とするユーザ端末。 - 前記所定条件は、前記第1の下りデータの種別、前記第1の下り制御情報の種別、前記第1の下りデータ及び/又は前記第2の下りデータのトランスポートブロックサイズ、及び前記第1の下りデータ及び/又は前記第2の下りデータの変調・符号化方式の少なくとも一つであることを特徴とする請求項1に記載のユーザ端末。
- 前記第1の下り制御情報に基づく第1の上りデータ及び/又は前記第2の下り制御情報に基づく第2の上りデータの送信を行う送信部を有し、
前記制御部は、所定条件に基づいて、前記第1のTTI内における前記第1の上りデータと、前記第2の上りデータの同一キャリアにおける同時送信を制御することを特徴とする請求項1又は請求項2に記載のユーザ端末。 - 前記制御部は、前記第1の下りデータと前記第2の下りデータの同一キャリアにおける同時受信の適用可否に関する能力情報を無線基地局に通知するように制御することを特徴とする請求項1から請求項3のいずれかに記載のユーザ端末。
- 前記制御部は、前記第1の下り制御情報及び/又は前記第2の下り制御情報の検出に適用可能な復号回数に関する能力情報を無線基地局に通知するように制御することを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。
- 第1の送信時間間隔(TTI:Transmission Time Interval)と、前記第1のTTIよりTTI長が短い第2のTTIを利用して通信を行うユーザ端末の無線通信方法であって、
無線基地局から第1のTTI毎に送信される第1の下り制御情報と、第2のTTIで送信される第2の下り制御情報と、を受信する工程と、
所定条件に基づいて前記第1の下り制御情報に基づく第1の下りデータと、前記第2の下り制御情報に基づく第2の下りデータの同一キャリアにおける同時受信を制御する工程と、を有することを特徴とする無線通信方法。
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