WO2017038532A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017038532A1 WO2017038532A1 PCT/JP2016/074391 JP2016074391W WO2017038532A1 WO 2017038532 A1 WO2017038532 A1 WO 2017038532A1 JP 2016074391 W JP2016074391 W JP 2016074391W WO 2017038532 A1 WO2017038532 A1 WO 2017038532A1
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- Non-patent Document 1 LTE successor systems (for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), New- RAT (called Radio Access Technology) is also being studied.
- LTE-A LTE-Advanced
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- New- RAT called Radio Access Technology
- each subframe can be dynamically used as DL (Downlink) or UL (Uplink) in order to use a given frequency spectrum more flexibly and effectively.
- DL Downlink
- UL Uplink
- the introduction of the Flexible duplex system is under consideration.
- DL / UL is not defined in advance for time / frequency resources, and is dynamically changed according to various conditions such as traffic and channel state.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the present invention has been made in view of the above points, and an object of the present invention is to provide a user terminal, a radio base station, and a radio communication method capable of realizing low-delay communication in a next-generation mobile communication system. To do.
- the user terminal which concerns on 1 aspect of this invention receives at least 1 downlink control information among the 1st downlink control information which schedules reception of downlink data, and the 2nd downlink control information which schedules transmission of uplink data And a control unit that controls reception of the downlink data corresponding to the downlink control information and / or transmission of the uplink data at a predetermined transmission time interval (TTI).
- TTI transmission time interval
- the control unit uses the predetermined TTI based on the TTI that has received the downlink control information regardless of whether the downlink control information is the first downlink control information or the second downlink control information. It is characterized by controlling so that it may become the same TTI.
- low-delay communication can be realized in a next-generation mobile communication system.
- FIG. 3A is a diagram illustrating an example of radio resource allocation when scheduling the same frequency carrier with DL grant and UL grant.
- FIG. 3B is a diagram illustrating scheduling of the same frequency carrier with DL grant and different frequency carriers with UL grant. It is a figure which shows an example of radio
- FIG. 5A is a diagram illustrating an example of allocation of only PDCCH that transmits UL grant and PUSCH that transmits data, and FIG.
- FIG. 5B is a diagram illustrating an example of resource allocation of an uplink reference signal (RS). .
- FIG. 6A is a diagram illustrating an example of resource allocation of SRS
- FIG. 6B is a diagram illustrating an example of resource allocation of delivery confirmation information of HARQ (Hybrid Automatic Repeat reQuest).
- HARQ Hybrid Automatic Repeat reQuest
- a radio base station (eNB: evolved Node B) schedules transmission / reception of data to / from a user terminal (UE: User Equipment) using a downlink control channel.
- UE User Equipment
- DCI downlink control information
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced PDCCH
- FIG. 1 is a diagram showing an example of data scheduling in an existing LTE system.
- FIG. 1 shows DL scheduling and UL scheduling indicated by DCI received by PDCCH.
- the UE is a PDSCH (Physical Downlink) based on the DL grant in the same subframe in which a DL grant (also referred to as a DL assignment (downlink assignment)) according to the DCI format 1A or the like is detected. Shared Channel) is received.
- PDSCH Physical Downlink
- Shared Channel Shared Channel
- the UE for example, a PUSCH (Physical) based on the UL grant in a subframe after a predetermined period (for example, after 4 subframes) from the subframe in which the UL grant (uplink grant) according to the DCI format 0/4 is detected.
- a PUSCH Physical
- the UE for example, a PUSCH (Physical) based on the UL grant in a subframe after a predetermined period (for example, after 4 subframes) from the subframe in which the UL grant (uplink grant) according to the DCI format 0/4 is detected.
- a PUSCH Physical
- TTI Transmission Time Interval
- CC component carrier
- LTE Rel In 13 or later wireless communication systems (for example, 5G), in order to use a given frequency spectrum more flexibly and effectively, a flexible duplex system is introduced that allows each subframe to be dynamically used as DL or UL. Is being considered.
- DL / UL In Flexible duplex, DL / UL is not defined in advance for time / frequency resources, and is dynamically changed according to various conditions such as traffic and channel state.
- FIG. 2 is a diagram illustrating an example of radio resource allocation in a carrier that uses a flexible duplex.
- FIG. 2 shows radio resources for 10 TTIs.
- frequency spectrum is DL-only (downlink transmission only), UL-only (uplink transmission only), DL-heavy (downlink transmission ratio is large), It can be used as UL-heavy (high uplink transmission ratio).
- FDD operation can be performed by using a combination of two frequency carriers of DL-only and UL-only, and TDD operation can also be performed by using the DL + UL setting.
- the scheduling of the existing LTE system cannot maximize the flexibility of the flexible duplex, and the effect of improving the frequency utilization efficiency and the throughput is reduced, and it is difficult to suppress the delay related to the retransmission. Can be considered.
- the inventors of the present invention pay attention to the fact that when control over TTI (subframe) (inter-subframe scheduling) is used, old control in time limits newer control (control at a later time). did. In addition, in inter-subframe scheduling, attention was also paid to the necessity of scheduling in consideration of future control contents.
- the present inventors have conceived to reduce the scheduling timing as much as possible based on these points of interest. Specifically, the idea was to transmit and receive UL grant and uplink data with the same TTI. Furthermore, it has been found that the scheduling timing is made the same regardless of the DL / UL scheduling. According to one aspect of the present invention, it is possible to instruct the UE to perform scheduling for the latest time in a unified manner, so that dynamic control of DL / UL of each TTI can be effectively realized. Moreover, RRQ (Round Trip Time) of HARQ can be shortened suitably.
- downlink control information is notified using PDCCH with the first few symbols as in the existing LTE system, but the application of the present invention is not limited to this.
- the downlink control information may be notified on the EPDCCH multiplexed in the PDSCH region, or may be notified on other channels or other radio resources.
- the 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. It may be.
- downlink control information (which may be referred to as uplink scheduling information and uplink scheduling control information) for scheduling uplink data transmission is referred to as UL grant
- downlink control information (downlink scheduling information, downlink scheduling information, Downlink scheduling control information, DL assignment, etc.) may be called DL grant, but the name is not limited to this.
- the downlink control information (downlink control signal) may be referred to as, for example, L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), or simply L1 control information (L1 control signal). May be called.
- the eNB notifies the UE of downlink control information (scheduling information) indicating radio resources to be allocated to a predetermined TTI (for example, subframe).
- the eNB performs control such that radio resources are allocated with the same TTI with reference to the TTI that transmits the downlink control information.
- the UE performs control so that transmission / reception is performed with the same TTI with reference to the TTI that has received the downlink control information, regardless of whether the detected downlink control information is UL grant or DL grant.
- FIG. 3 is a diagram illustrating an example of scheduling according to the first embodiment.
- FIG. 3A shows an example of radio resource allocation when scheduling the same frequency carrier with DL grant and UL grant.
- FIG. 3B shows an example of radio resource allocation in the case where the same frequency carrier is scheduled with the DL grant and different frequency carriers are scheduled with the UL grant.
- scheduling of data transmission / reception is performed with the same TTI as the notification of downlink control information.
- the UE monitors and receives the L1 control signal with a predetermined frequency carrier. If the received L1 control information includes a DL grant addressed to the terminal itself, the DL data is received by the TTI that has received the DL grant. Further, if the UL grant addressed to the terminal is included in the L1 control signal, the UL data is received by the TTI that has received the UL grant.
- the reception of DL / UL grant and the transmission / reception of DL / UL data may be performed with the same TTI as shown in FIG. 3, or may be performed with different TTIs as described later in FIG.
- a non-transmission period for example, a guard period (GP), a gap, a GP section, or the like
- a guard period may be the time from when the downlink control information is received until the transmission of data is started.
- the guard period may be 20 ⁇ s, for example, or may be one or more symbol periods.
- the symbol period may be expressed in, for example, an OFDM (Orthogonal Frequency Division Multiplexing) symbol unit, may be expressed in a reciprocal bandwidth (ie, sampling length) unit, or in other units. It may be expressed.
- the length of the non-transmission period may be different or the same in the case of scheduling of the same frequency carrier (FIG. 3A) and the case of scheduling of different frequency carriers (FIG. 3B).
- the guard period may be longer than a period during which PDCCH can be transmitted (for example, a maximum of 3 symbols).
- FIG. 4 is a diagram illustrating another example of scheduling according to the first embodiment.
- FIG. 4 shows an example of radio resource allocation when scheduling the same frequency carrier with DL grant and UL grant.
- scheduling of data transmission / reception is performed in a TTI (after 1 TTI) adjacent to the TTI to which downlink control information is notified.
- the configuration for scheduling adjacent TTIs with downlink control information is suitable for the case where downlink control information is notified on EPDCCH, for example, because scheduling TTI can be DL only and scheduled TTI can be UL only. is there.
- the number of TTIs from the scheduled TTI to the scheduled TTI may be different depending on whether the downlink control information is notified by PDCCH or EPDCCH.
- the UE when downlink control information is notified by PDCCH, the UE performs transmission / reception processing assuming that the number of TTIs is 0 (scheduling in the same subframe), while downlink control information is notified by EPDCCH.
- the transmission / reception process may be performed assuming that the number of TTIs is 1 (scheduling in adjacent subframes).
- the UE when the UE detects allocation of both DL grant and UL grant scheduling different frequency carriers with the same TTI, the UE determines that both grants are valid, and different frequency carriers with the same TTI.
- the data transmission and data reception may be performed.
- the UE detects the allocation of both DL grant and UL grant with the same TTI of the same frequency carrier, the UE ignores the UL grant, determines that the DL grant is valid, and based on the DL grant Downstream data may be received. By doing so, for example, it is possible to avoid the occurrence of interference with other users that are frequency and / or spatially multiplexed in the same TTI of the same cell.
- the DL grant is ignored, it is determined that the UL grant is valid, and uplink data transmission is performed based on the UL grant. You may go. By doing in this way, for example, it is possible to process UL data having a greater influence of delay earlier, and to improve the user experience speed.
- the UE when the UE detects that scheduling is performed from both the DL grant and the UL grant in a predetermined TTI of the same frequency carrier, the UE ignores the UL grant and determines that the DL grant is valid. Downlink data may be received based on the DL grant. On the other hand, if it is detected that scheduling is performed from both the DL grant and the UL grant in a predetermined TTI of the same frequency carrier, the DL grant is ignored, and the UL grant is determined to be valid, and based on the UL grant. Then, uplink data may be transmitted.
- the UE may determine that the latest grant is valid, or based on a predetermined rule.
- the effective grant may be determined, or the oldest grant may be determined to be effective. Then, the UE may transmit / receive data based on the grant that is determined to be valid.
- the UE transmits scheduling information (for example, the number of TTIs from the scheduled TTI to the scheduled TTI), upper layer signaling (for example, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)), etc.) , SIB (System Information Block))).
- scheduling information for example, the number of TTIs from the scheduled TTI to the scheduled TTI
- upper layer signaling for example, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)), etc.) , SIB (System Information Block)
- SIB System Information Block
- the radio base station it is possible to suitably reduce the time from when the radio base station notifies the scheduling information to when the UE performs transmission / reception based on the information.
- a certain processing time is required from the time when the UE receives the UL grant until the PUSCH can be transmitted. For example, encoding or modulation processing is required as processing for generating a data signal to be transmitted by PUSCH.
- TBS Transport Block Size
- these processing times become longer.
- calculation of transmission power and surplus transmission power may also be performed after UL grant reception.
- the guard period length (GP length) of the TTI scheduled by the UL grant described in the first embodiment is variable, and have found the second embodiment.
- the UE determines and uses the GP length (may be called the GAP length) provided between the UL grant reception and the UL transmission for each UL grant. For example, the UE determines the GP length based on its own terminal processing capability (UE capability), TBS, coding scheme (eg, turbo coding), cell radius of the connected cell, and transmission timing (eg, timing) applied to the own terminal. (Advance) or a combination thereof.
- the UE may shorten the GP length when the TBS of the transmission data is small, and lengthen the GP length when the TBS is large.
- the variable-length GP in the second embodiment may be referred to as a “Flexible GP”.
- FIG. 5 is a diagram illustrating an example of uplink resource allocation according to the second embodiment.
- FIG. 5A is a diagram illustrating an example of allocation of only the PDCCH that transmits the UL grant and the PUSCH that transmits the data.
- Scheduling A and scheduling B shown in FIG. 5A show scheduling of UL transmission based on different UL grants. Note that these schedulings are merely shown in the figure for simplicity and do not have to occur at the same TTI.
- the radio resource to which data is allocated is not limited to the configuration in FIG. 5A.
- the GP length is different for each scheduling.
- Scheduling A is, for example, when the TBS corresponding to the UL grant is small and the GP length is short.
- scheduling B is a case where, for example, the TBS corresponding to the UL grant is large, and the GP length is long. Note that, in FIG. 5B and FIG. 6 to be described later, radio resource mapping related to these two schedulings is illustrated as in FIG. 5A.
- the guard period is defined in a predetermined range, and the guard periods of scheduling A and B correspond to the minimum value and the maximum value of the predetermined range, respectively. To do.
- the time resource available for data transmission can be increased, so that the uplink frequency resource can be configured to be relatively narrow.
- radio resources can be secured and data transmission can be performed even if time resources available for data transmission are reduced.
- FIG. 5B is a diagram illustrating an example of resource allocation of an uplink reference signal (RS).
- the UE uses a predetermined radio resource (eg, synchronized with a subframe) (time and / or frequency resource) that does not depend on the GP length (and PUSCH resource allocation) in the TTI that performs uplink transmission. Control to transmit RS.
- a predetermined radio resource eg, synchronized with a subframe
- time and / or frequency resource time and / or frequency resource
- Control to transmit RS.
- FIG. 5B an example is shown in which the UE performs mapping so that the RS is arranged after the longest guard period in the TTI scheduled by the UL grant.
- the RS may be arranged after the minimum guard period. it can.
- RS is mapped at a fixed timing / position even between different cells (and even when MU-MIMO (Multi User Multi Input Multi Output) is applied to UE).
- MU-MIMO Multi User Multi Input Multi Output
- the uplink reference signal to be allocated to a fixed resource may be, for example, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS: DeModulation Reference Signal), or other reference signal. There may be. Further, as the measurement reference signal, a reference signal (for example, may be referred to as eSRS (enhanced SRS)) that can be arranged in a discontinuous frequency resource may be used.
- SRS Sounding Reference Signal
- DMRS Demodulation reference Signal
- a reference signal for example, may be referred to as eSRS (enhanced SRS)
- eSRS enhanced SRS
- FIG. 6 is a diagram illustrating another example of uplink resource allocation according to the second embodiment.
- FIG. 6A is a diagram illustrating an example of SRS resource allocation.
- the UE transmits SRS / eSRS immediately after the elapse of the minimum guard period in a predetermined TTI (for example, TTI scheduled with UL grant).
- a predetermined TTI for example, TTI scheduled with UL grant.
- the SRS / eSRS may be transmitted from the first timing that can be transmitted when the TBS is minimum because the encoding process is unnecessary unlike the data. It should be noted that SRS / eSRS may be transmitted at this timing even in a TTI that is not subject to scheduling by UL grant (data transmission is not performed).
- SRS / eSRS is a reference signal and does not require complicated transmission signal processing, it can be transmitted in a short time. Therefore, by arranging SRS / eSRS at a relatively early transmission timing in the TTI, a resource having a relatively late transmission timing can be used for another signal allocation, and reduction in frequency utilization efficiency can be suppressed.
- FIG. 6B is a diagram illustrating an example of resource allocation of HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (also referred to as retransmission control information, HARQ-ACK, ACK / NACK, etc.).
- HARQ Hybrid Automatic Repeat reQuest
- the UE starts transmission of ACK / NACK immediately after the minimum guard period elapses in a predetermined TTI (for example, TTI scheduled with UL grant).
- TTI for example, TTI scheduled with UL grant
- ACK / NACK may be transmitted from the first timing that can be transmitted when TBS is minimum. Note that ACK / NACK may be transmitted at this timing even in a TTI that is not subject to scheduling by UL grant (data transmission is not performed).
- the ACK / NACK may be an ACK / NACK for the downlink data of the TTI immediately before the ACK / NACK is transmitted (the previous TTI), or before that (two before, three before, four) ACK / NACK for downlink data of the previous TTI or the like may be used.
- ACK / NACK may be transmitted in a predetermined narrow band narrower than the system bandwidth.
- ACK / NACK may also support frequency hopping. Thereby, the frequency diversity effect can be acquired about transmission of ACK / NACK, and the coverage of UE can be extended.
- wireless resource (timing) in which allocation of SRS / eSRS and ACK / NACK occurs simultaneously, it is good also as a structure which gives priority to one transmission and drops the other transmission. For example, when ACK / NACK is transmitted from the first possible transmission timing when the TBS is minimum, SRS / eSRS transmission may be dropped at that timing, or transmission avoiding ACK / NACK resources. You may make it do.
- the UE determines an ACK / NACK resource (frequency / time resource) based on the GP length corresponding to the uplink data transmission. Also good.
- ACK / NACK is information including a simple bit string, for example, and does not require complicated transmission signal processing, and can be transmitted in a short time. Therefore, by arranging ACK / NACK from a relatively early transmission timing in the TTI, a resource having a relatively late transmission timing can be used for another signal allocation, and a reduction in frequency utilization efficiency can be suppressed.
- PUSCH transmission can be appropriately performed.
- Wireless communication system Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using any one or combination of the wireless communication methods according to the above embodiments of the present invention.
- FIG. 7 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.
- DC dual connectivity
- the wireless communication system 1 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), etc., or a system that realizes these.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced 4G (4th generation mobile communication system)
- 5G. 5th generation mobile communication system
- FRA Full Radio Access
- New-RAT Radio Access Technology
- a radio communication system 1 shown in FIG. 7 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. -12c). Moreover, the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously by CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
- 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 methods are not limited to these combinations.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- 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 PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH.
- HARQ Hybrid Automatic Repeat reQuest
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used.
- PUSCH uplink shared channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by PUSCH.
- downlink radio quality information CQI: Channel Quality Indicator
- delivery confirmation information and the like are transmitted by PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- a cell-specific reference signal CRS
- CSI-RS channel state information reference signal
- DMRS demodulation reference signal
- PRS Positioning Reference Signal
- a measurement reference signal SRS: Sounding Reference Signal
- a demodulation reference signal DMRS
- the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
- FIG. 8 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ transmission processing
- scheduling 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, and other transmission processing
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the 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 uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / 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 transmits downlink control information (for example, DCI) related to data transmission and / or reception to the user terminal 20.
- DCI downlink control information
- the transmission / reception unit 103 may transmit instruction information (DL grant) for reception of the downlink shared channel (PDSCH).
- PDSCH downlink shared channel
- the transmission / reception unit 103 may transmit instruction information (UL grant) for transmission of the uplink shared channel (PUSCH).
- DL grant for reception of the downlink shared channel
- UL grant for transmission of the uplink shared channel
- These DCIs may be transmitted with the same TTI or with different TTIs. Further, these DCIs may be transmitted on the same frequency carrier or may be transmitted on different frequency carriers.
- the transmission / reception unit 103 transmits downlink data (PDSCH) with a predetermined TTI determined (determined) by the control unit 301. Further, the transmission / reception unit 103 may transmit HARQ-ACK for uplink data (PUSCH). Further, the transmission / reception unit 103 may transmit information regarding scheduling.
- the transmission / reception unit 103 receives uplink data from the user terminal 20 via the uplink shared channel (for example, PUSCH) with a predetermined TTI determined by the control unit 301.
- the transmission / reception unit 103 may receive HARQ-ACK for downlink data transmitted on the downlink shared channel (PDSCH) based on DCI.
- PDSCH downlink shared channel
- FIG. 9 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment of the present invention. Note that FIG. 9 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. 9, the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. ing.
- the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. ing.
- the control unit (scheduler) 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 system information, a downlink data signal transmitted on the PDSCH, and a downlink control signal transmitted on the PDCCH and / or EPDCCH. It also controls scheduling of synchronization signals (PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals such as CRS, CSI-RS, and DMRS.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the control unit 301 also includes an uplink data signal transmitted on the PUSCH, an uplink control signal (eg, delivery confirmation information) transmitted on the PUCCH and / or PUSCH, a random access preamble transmitted on the PRACH, an uplink reference signal, etc. Control the scheduling of
- control unit 301 performs control so that data transmission and / or reception corresponding to downlink control information (for example, DCI) transmitted from the transmission / reception unit 103 is performed with a predetermined TTI (scheduled TTI).
- downlink control information for example, DCI
- control unit 301 uses the TTI (scheduling TTI) that transmitted the downlink control information as a reference regardless of whether the downlink control information transmitted from the transmission / reception unit 103 is the UL grant or the DL grant. Control is performed so as to have the same TTI (first embodiment).
- the control unit 301 can determine to use, for example, the same TTI as the TTI that transmitted the downlink control information or the next TTI as the predetermined TTI.
- the control unit 301 may perform control so that data transmission and / or reception is performed using the same frequency carrier regardless of whether the downlink control information transmitted from the transmission / reception unit 103 is UL grant or DL grant.
- control unit 301 may perform control so that only data transmission and / or reception corresponding to any grant is performed on a plurality of downlink control information transmitted by the same TTI. For example, the control unit 301 may perform control while ignoring one of the UL grant and the DL grant transmitted with the same TTI.
- control unit 301 controls processing of the reception signal processing unit 304 and / or the measurement unit 305 on the assumption that a variable non-transmission period (GP) is included in the scheduling TTI in data transmission based on the UL grant. (Second embodiment). For example, the control unit 301 may determine the non-transmission period based on the size of the resource that indicates the UL grant or the capability information of the UE.
- GP variable non-transmission period
- control unit 301 controls the processing of the reception signal processing unit 304 and / or the measurement unit 305 on the assumption that the reference signal is transmitted from the user terminal 20 using a predetermined resource regardless of the GP length in the scheduling TTI. May be. Further, the control unit 301 transmits the downlink control information or at the timing when the shortest GP length has elapsed from the head of the TTI, and the delivery confirmation information (HARQ ⁇ ) for the reference signal for measurement (eg, SRS / eSRS) or downlink data. ACK) may be received.
- HARQ ⁇ delivery confirmation information for the reference signal for measurement
- ACK delivery confirmation information
- the transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it 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 transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301.
- the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.
- CSI Channel State Information
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103.
- the mapping unit 303 can be 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, an uplink signal (uplink control signal, uplink data signal, uplink 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. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 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. 10 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201, 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 downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the 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 downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs 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 transmits uplink data to the radio base station 10 through an uplink shared channel (for example, PUSCH) with a predetermined TTI determined by the control unit 401.
- the transmission / reception unit 203 may transmit HARQ-ACK for downlink data transmitted on the downlink shared channel (PDSCH) based on DCI.
- PDSCH downlink shared channel
- the transmission / reception unit 203 receives DCI related to data transmission and / or reception from the radio base station 10.
- the transmission / reception unit 203 may receive instruction information (DL grant) for receiving a downlink shared channel (PDSCH).
- PDSCH downlink shared channel
- UL grant instruction information for transmission of the uplink shared channel (PUSCH).
- DL grant instruction information for receiving a downlink shared channel
- UL grant instruction information for transmission of the uplink shared channel
- These DCIs may be received with the same TTI or with different TTIs. Also, these DCIs may be received on the same frequency carrier or on different frequency carriers.
- the transmission / reception unit 203 receives downlink data (PDSCH) with a predetermined TTI determined by the control unit 401. Further, the transmission / reception unit 203 may receive HARQ-ACK for uplink data (PUSCH). The transmission / reception unit 203 may receive information related to scheduling.
- PDSCH downlink data
- PUSCH uplink data
- FIG. 11 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. Note that FIG. 11 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. 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 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
- the control unit 401 controls generation of an uplink control signal (for example, delivery confirmation information) and an uplink data signal based on a downlink control signal, a result of determining whether or not retransmission control is required for the downlink data signal, and the like.
- control unit 401 performs control so that data transmission and / or reception corresponding to downlink control information (for example, DCI) acquired from the reception signal processing unit 404 is performed with a predetermined TTI (scheduled TTI). To do.
- downlink control information for example, DCI
- the control unit 401 uses the predetermined TTI as the TTI (scheduling TTI) that has received the downlink control information regardless of whether the downlink control information received by the reception signal processing unit 404 is UL grant or DL grant. Control is performed so that the same TTI is used as a reference (first embodiment).
- the control unit 401 can determine to use, for example, the same TTI as the TTI that received the downlink control information or the subsequent (for example, one after) TTI as the predetermined TTI.
- the control unit 401 may perform control so that data transmission and / or reception is performed using the same frequency carrier regardless of whether the downlink control information received by the reception signal processing unit 404 is UL grant or DL grant.
- the control unit 401 controls to perform data transmission and / or reception by regarding any grant as valid. May be.
- the control unit 401 may perform control by ignoring one of the UL grant and DL grant received by the same TTI.
- control unit 401 may perform control so that a variable non-transmission period (GP) is provided in the scheduling TTI in data transmission based on the UL grant (second embodiment). For example, the control unit 401 may determine the non-transmission period based on the size of the resource instructed by the UL grant, TBS, or the like.
- GP variable non-transmission period
- the control unit 401 may perform control so that the reference signal is transmitted using a predetermined resource regardless of the GP length. Further, the control unit 401 receives the downlink control information or at the timing when the shortest GP length has elapsed from the head of the TTI, the delivery reference information (HARQ ⁇ ) for the reference signal for measurement (eg, SRS / eSRS) and downlink data. (ACK) may be transmitted.
- HARQ ⁇ delivery reference information
- ACK downlink data.
- control unit 401 acquires information related to scheduling (for example, the number of TTIs from the scheduled TTI to the scheduled TTI) from the received signal processing unit 404, the control unit 401 updates the parameters used for control based on the information. May be.
- the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink 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 generator 402 generates an uplink control signal related to delivery confirmation information and channel state information (CSI) based on an instruction from the controller 401, for example.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal 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 downlink signal (downlink control signal, downlink data signal, downlink 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 DCI (DCI format) that schedules transmission and / or reception of predetermined TTI data (TB: Transport Block) based on an instruction from the control unit 401.
- DCI DCI format
- TTI Transport Block
- the received signal processing unit 404 may decode the DCI by performing a demasking process using a predetermined identifier (RNTI: Radio Network Temporary Identifier), or may decode the DCI assuming a predetermined payload size. Good.
- RNTI Radio Network Temporary Identifier
- 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 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), 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 is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- the radio base station 10 and the user terminal 20 are realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array). May be.
- the radio base station 10 and the user terminal 20 are each a computer device including a processor (CPU: Central Processing Unit), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. It may be realized. That is, the radio base station, user terminal, and the like according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method according to the present invention.
- Computer-readable recording media include, for example, flexible disks, magneto-optical disks, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), CD-ROM (Compact Disc-ROM), RAM (Random Access Memory), A storage medium such as a hard disk.
- the program may be transmitted from a network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.
- the program may be a program that causes a computer to execute the operations described in the above embodiments.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.
- software, instructions, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- DSL digital subscriber line
- wireless technology such as infrared, wireless and microwave.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may also be called a frequency carrier, a carrier frequency, a cell, or the like.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by an index.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems and / or extended based on these It may be applied to the next generation system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- communication system 5G (5th generation mobile communication system
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Abstract
Description
<第1の実施形態>
本発明の第1の実施形態では、eNBは、所定のTTI(例えば、サブフレーム)に割り当てる無線リソースを示す下り制御情報(スケジューリング情報)をUEに通知する。ここで、eNBは、下り制御情報がULグラント及びDLグラントのいずれであっても、下り制御情報を送信するTTIを基準として同じTTIで無線リソース割り当てを行うように制御を行う。また、UEは、検出した下り制御情報がULグラント及びDLグラントのいずれであっても、下り制御情報を受信したTTIを基準として同じTTIで送信/受信を行うように制御を行う。
UEがULグラントを受信してからPUSCH送信が可能となるまでには、一定の処理時間を要する。例えば、PUSCHで送信すべきデータ信号を生成するための処理として、符号化や変調処理が必要となる。データの送受信単位であるTBS(Transport Block Size)が大きくなると、これらの処理時間が長くなる。また、上り信号の送信のため、送信電力や余剰送信電力(power headroom)の計算も、ULグラント受信後に行う可能性がある。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本発明の上記各実施形態に係る無線通信方法のいずれか又は組み合わせを用いて通信が行われる。
図8は、本発明の一実施形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。なお、送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されればよい。
図10は、本発明の一実施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。
Claims (10)
- 下りデータの受信をスケジューリングする第1の下り制御情報及び上りデータの送信をスケジューリングする第2の下り制御情報のうち少なくとも1つの下り制御情報を受信する受信部と、
前記下り制御情報に対応する前記下りデータの受信及び/又は前記上りデータの送信を、所定の送信時間間隔(TTI:Transmission Time Interval)で行うように制御する制御部と、を有し、
前記制御部は、前記所定のTTIを、前記下り制御情報が前記第1の下り制御情報及び前記第2の下り制御情報のいずれであっても、前記下り制御情報を受信したTTIを基準として同一のTTIとなるように制御することを特徴とするユーザ端末。 - 前記所定のTTIは、下り制御情報を受信したTTIと同じTTI又は1つ後のTTIであることを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、受信した下り制御情報が前記第1の下り制御情報及び前記第2の下り制御情報のいずれであっても、同一の周波数キャリアでデータ送信及び/又は受信するように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の下り制御情報及び前記第2の下り制御情報の両方を同じTTIで受信した場合、前記第2の下り制御情報を無視するように制御することを特徴とする請求項3に記載のユーザ端末。
- 前記制御部は、前記第2の下り制御情報を受信した場合、前記所定のTTIに無送信期間を設け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。
- 前記制御部は、前記無送信期間の長さを所定の範囲で可変とすることを特徴とする請求項5に記載のユーザ端末。
- 前記制御部は、前記所定のTTIにおいて、前記無送信期間の長さに依らない所定の無線リソースで参照信号を送信するように制御することを特徴とする請求項6に記載のユーザ端末。
- 前記制御部は、前記所定のTTIにおいて、前記所定の範囲の最小値に対応する前記無送信期間の経過直後に、測定用参照信号及び/又は下りデータに対する送達確認情報を送信するように制御することを特徴とする請求項6又は請求項7に記載のユーザ端末。
- 下りデータの受信をスケジューリングする第1の下り制御情報及び上りデータの送信をスケジューリングする第2の下り制御情報のうち少なくとも1つの下り制御情報を送信する送信部と、
前記下り制御情報に対応する前記下りデータの送信及び/又は前記上りデータの受信を、所定の送信時間間隔(TTI:Transmission Time Interval)で行うように制御する制御部と、を有し、
前記制御部は、前記所定のTTIを、前記下り制御情報が前記第1の下り制御情報及び前記第2の下り制御情報のいずれであっても、前記下り制御情報を受信したTTIを基準として同一のTTIとなるように制御することを特徴とする無線基地局。 - 下りデータの受信をスケジューリングする第1の下り制御情報及び上りデータの送信をスケジューリングする第2の下り制御情報のうち少なくとも1つの下り制御情報を受信する受信工程と、
前記下り制御情報に対応する前記下りデータの受信及び/又は前記上りデータの送信を、所定の送信時間間隔(TTI:Transmission Time Interval)で行うように制御する制御工程と、を有し、
前記制御工程は、前記所定のTTIを、前記下り制御情報が前記第1の下り制御情報及び前記第2の下り制御情報のいずれであっても、前記下り制御情報を受信したTTIを基準として同一のTTIとなるように制御することを特徴とする無線通信方法。
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CN109495972A (zh) * | 2017-09-10 | 2019-03-19 | 株式会社Ntt都科摩 | 发送上行控制信息的方法和移动台 |
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CN107950051A (zh) | 2018-04-20 |
US20180255568A1 (en) | 2018-09-06 |
CN107950051B (zh) | 2022-03-01 |
US10638502B2 (en) | 2020-04-28 |
EP3346754B1 (en) | 2024-06-12 |
JP6797808B2 (ja) | 2020-12-09 |
EP3346754A1 (en) | 2018-07-11 |
JPWO2017038532A1 (ja) | 2018-06-14 |
EP3346754A4 (en) | 2019-04-10 |
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