WO2018124032A1 - 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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- WO2018124032A1 WO2018124032A1 PCT/JP2017/046563 JP2017046563W WO2018124032A1 WO 2018124032 A1 WO2018124032 A1 WO 2018124032A1 JP 2017046563 W JP2017046563 W JP 2017046563W WO 2018124032 A1 WO2018124032 A1 WO 2018124032A1
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- tti
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/007—Open loop measurement
- H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
- H04W56/008—Open loop measurement based on arrival time vs. expected arrival time detecting arrival of signal based on received raw signal
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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
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- Non-Patent Document 1 LTE successor systems (for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT) and LTE Rel.14, 15 and later) are also being considered.
- TTI Transmission Time Interval
- DL Downlink
- UL Uplink
- HARQ Hybrid Automatic Repeat reQuest
- the existing LTE system (for example, LTE Rel. 8-13) supports frequency division duplex (FDD) and time division duplex (TDD) as duplex schemes.
- FDD is a method of assigning different frequencies between DL and UL, and is also called a frame structure (FS) type 1 (FS1).
- FS frame structure type 1
- TDD is a method of temporally switching the same frequency between DL and UL, and is also called frame structure type 2 (FS2).
- communication is performed based on a UL / DL configuration (UL / DL configuration) that defines a UL subframe and a DL subframe configuration in a radio frame.
- the transmission timing reference value is fixed to 4 ms in consideration of the signal processing time in the user terminal and / or the radio base station.
- retransmission control information for example, ACK (Acknowledge) or NACK (Negative ACK), A / N, HARQ-ACK, etc. for a DL shared channel (for example, PDSCH: Physical Downlink Shared Channel), hereinafter referred to as PDSCH)
- PDSCH Physical Downlink Shared Channel
- Transmission timing also referred to as HARQ timing.
- the PDSCH processing time in the user terminal is assumed to be 4 ms, and the PDSCH A / N is transmitted (feedback) in subframe # n + 4.
- the A / N of the PDSCH is a UL subframe after subframe # n + 4. Sent.
- a / N transmission timing (UL HARQ timing, etc.) for a UL shared channel for example, PUSCH: Physical Uplink Shared Channel, hereinafter referred to as PUSCH.
- PUSCH Physical Uplink Shared Channel
- the PUSCH processing time in the user terminal is assumed to be 4 ms, and the PUSCH is subframed. # N + 4 is transmitted.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the present invention has been made in view of such points, and even when the processing time of the radio base station and / or the user terminal is reduced, it is preferable to transmit a UL signal in response to reception of a predetermined DL signal.
- An object of the present invention is to provide a user terminal and a wireless communication method that can be implemented.
- the user terminal which concerns on 1 aspect of this invention has a receiving part which receives DL signal, and a control part which controls transmission of UL signal with respect to the said DL signal based on timing advance,
- the said control part is timing. Regardless of the advance value, the UL signal is controlled to be transmitted using a UL resource after a predetermined period with reference to the timing at which the DL signal is received.
- the present invention even when the processing time of the radio base station and / or the user terminal is shortened, it is possible to suitably carry out transmission of a UL signal in response to reception of a predetermined DL signal.
- FIG. 1 is a diagram illustrating an example of FDD A / N transmission timing.
- 2A and 2B are diagrams illustrating an example of scheduling / HARQ timing in existing LTE.
- 3A and 3B are diagrams illustrating an example of scheduling / HARQ timing when the processing time is reduced.
- FIG. 4 is a diagram illustrating an example of the first aspect.
- FIG. 5 is a diagram illustrating an example of the second mode.
- FIG. 6 is a diagram illustrating an example of a modification of the second mode.
- FIG. 7 is a diagram illustrating an example in which one piece of scheduling / HARQ timing information corresponds to scheduling / HARQ timing based on an existing transmission timing determination method.
- FIG. 8 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- FIG. 9 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- FIG. 10 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- FIG. 12 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- FIG. 13 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.
- a user terminal transmits downlink control information (DCI: Downlink Control Information) (scheduling DCI) transmitted from a base station (eNB: eNodeB).
- DCI Downlink Control Information
- eNB eNodeB
- the DCI that schedules DL data may be referred to as DL assignment (DL grant), and the DCI that schedules UL data may be referred to as UL grant.
- the UE performs control to transmit a predetermined UL signal according to a predetermined DL signal transmitted from the base station.
- a hybrid automatic repeat request (HARQ: Hybrid Automatic Repeat reQuest) is supported in order to suppress deterioration in communication quality between the UE and the base station.
- the UE transmits A / N for PDSCH using PUSCH or PUCCH based on reception result (decoding result or the like) of PDSCH transmitted from the base station.
- the base station controls PDSCH transmission (including initial transmission and / or retransmission) based on the A / N from the UE.
- DL / UL In the DL and / or UL (hereinafter referred to as DL / UL) of the existing LTE system, A / N after a predetermined time from a subframe in which data (PDSCH or PUSCH) is transmitted and received based on a reference value of a predefined transmission timing.
- Transmission timing (DL / UL HARQ timing, also simply referred to as HARQ timing, etc.) is controlled.
- a / N for the PDSCH is transmitted in a subframe 4 ms after the PDSCH reception subframe.
- FIG. 1 is a diagram illustrating an example of A / N transmission timing of FDD.
- the UE when receiving a PDSCH in subframe #n, the UE transmits the A / N of the PDSCH to the base station in subframe # n + 4 after 4 ms.
- the base station performs retransmission or initial transmission of the HARQ process after subframe # n + 8 after 4 ms from A / N received in subframe # n + 4 (may be before subframe # n + 8).
- the UE transmits a transmission timing such that transmission using PUSCH is performed with a resource indicated (scheduled) by a DCI after a predetermined time from a subframe in which DCI (UL grant) transmitted from the base station is received. (Also called scheduling timing).
- the base station transmits an A / N for the PUSCH using, for example, a retransmission control channel (for example, PHICH: Physical Hybrid-ARQ Indicator Channel).
- the UE controls PUSCH transmission (including initial transmission and / or retransmission) based on the A / N from the base station.
- FS1 FDD
- the UE when the UE detects a DL assignment for DL data in subframe #n, the UE transmits HARQ-ACK for the DL data in subframe # n + 4. To do. Further, when the UE detects a UL grant for UL data in subframe #n, the UE transmits the UL data in subframe # n + 4.
- FS2 TDD
- the UE when the UE detects DL assignment for DL data in subframe #n, the UE transmits HARQ-ACK for the DL data in subframe # n + k. Also, when the UE detects the UL grant for UL data in subframe #n, the UE transmits the UL data in subframe # n + k.
- the value of k is 4 or more, and is determined based on the UL / DL configuration of TDD and the subframe index #n that has received DCI.
- FS2 assuming that the processing time of PDSCH / PUSCH at the UE is equivalent to that of FS1, the A / N of the PDSCH is transmitted in the UL subframe after 4 ms of the reception subframe of PDSCH.
- scheduling, HARQ transmission timing, and the like are controlled with fixed values on the basis of 4 ms (reference value).
- UEs have different processing capabilities. Some UEs may support signal processing with shorter processing delays.
- a certain UE may support a self-contained operation.
- the self-contained operation is, for example, reception of a predetermined DL signal (data signal, etc.) within a predetermined period (subframe, slot, etc.), and UL signal (HARQ-ACK, etc.) based on the DL signal. May be an operation of completing transmission (feedback) of. That is, a UE that supports self-contained operation is assumed to have a high processing capacity.
- the UE when a UE that supports self-contained operation detects a DL assignment for DL data in subframe #n, the UE may transmit HARQ-ACK for the DL data in the same subframe #n. . In addition, when detecting a UL grant for UL data in subframe #n, the UE may transmit the UL data in subframe #n.
- another UE may require a slightly longer processing time. For example, when detecting another DL assignment for DL data in subframe #n, the another UE may transmit HARQ-ACK for the DL data in the same subframe # n + k. Further, when the UL grant for UL data is detected in subframe #n, the UE may transmit the UL data in subframe # n + k.
- scheduling timing and / or HARQ timing (hereinafter also simply referred to as scheduling / HARQ timing) is fixedly determined based on the subframe index as described above.
- the method seems not to work well.
- the conventional fixed transmission timing determination method has a problem that it is difficult to support a large timing advance (TA) value, particularly when the UE processing time is short.
- TA is a process used to match the UL signal reception timing on the base station side.
- the UL transmission of the UE can be shifted before the DL subframe timing by the TA information instructed from the base station.
- the TA information is, for example, a predetermined MAC control element notified by a random access response MAC PDU (Medium Access Control Protocol Data Unit) or PDSCH (Physical Downlink Shared Channel).
- MAC PDU Medium Access Control Protocol Data Unit
- PDSCH Physical Downlink Shared Channel
- 2A and 2B are diagrams illustrating an example of scheduling / HARQ timing in existing LTE.
- the UE receives the DL signal reception process (Rx proc.) And the UL signal (sub-frame) in 3 ms from the subframe #n that receives the DL signal (for example, UL grant) until the subframe # n + 4 that is the transmission subframe starts.
- HARQ-ACK transmission processing
- Tx proc. Needs to be performed.
- the base station needs to perform UL signal reception processing and DL signal transmission processing in 3 ms from the subframe # n + 4 that receives the UL signal to the start of subframe # n + 8 that is the data transmission / retransmission subframe. There is.
- the UE performs the DL signal reception process and the UL signal transmission in (3 ⁇ 0.667) ⁇ 2.33 ms from the subframe #n that receives the DL signal until the subframe # n + 4 that is the transmission subframe starts. It is necessary to perform processing.
- the base station performs (3 + 0.667) ⁇ 3.66 ms from the subframe # n + 4 that receives the UL signal to the start of subframe # n + 8 that is the data transmission / retransmission subframe. It is necessary to perform DL signal transmission processing.
- the delay in processing delay at the UE decreases.
- the process may not be in time, and the UL signal may not be transmitted at a desired timing. In this case, there is a possibility that the frequency utilization efficiency is lowered and the communication throughput is lowered.
- the scheduling / HARQ timing may be controlled based on a reference value smaller than 4 ms (for example, 3 ms).
- FIG. 3A and 3B are diagrams illustrating an example of scheduling / HARQ timing when the processing time is reduced.
- the UE performs the DL signal reception process and the UL signal in 2 ms from the subframe #n that receives the DL signal to the start of the subframe # n + 3 that is the transmission subframe. Needs to be sent.
- the base station performs UL signal reception processing and DL signal transmission processing in 2 ms from subframe # n + 3 that receives HARQ-ACK to the start of subframe # n + 6 that is a data transmission / retransmission subframe. There is a need.
- the UE performs the DL signal reception process and the UL signal transmission in (2 ⁇ 0.667) ⁇ 1.33 ms from the subframe #n that receives the DL signal to the subframe # n + 3 that is the transmission subframe. It is necessary to perform processing.
- the base station performs UL signal reception processing in (2 + 0.667) ⁇ 2.66 ms from the start of subframe # n + 3 that receives HARQ-ACK to the start of subframe # n + 6 that is a data transmission / retransmission subframe.
- DL signal transmission processing must be performed.
- TTI is not a subframe, but a shorter time unit (for example, slot, minislot, subslot, shortened TTI (sTTI: shortened TTI), etc.) It is being considered.
- a short time unit may be referred to as a TTI (short TTI) shorter than a 1 ms subframe (TTI).
- TTI may represent a time unit for transmitting / receiving a transport block, a code block, and / or a code word of transmission / reception data.
- a time interval (number of symbols) in which a data transport block, code block, and / or codeword is actually mapped may be shorter than the TTI.
- the TTI when the TTI is composed of a predetermined number of symbols (for example, 14 symbols), a transport block, a code block, and / or a code word of transmission / reception data are included in one to a predetermined number of symbol sections. It can be sent and received.
- a reference signal, a control signal, or the like is used for symbols that do not map data in the TTI Can be mapped.
- the present inventors have considered a method for appropriately controlling transmission of a UL signal according to a predetermined DL signal, assuming a base station and / or UE having a processing time shorter than that of an existing LTE system. It came to. According to one aspect of the present invention, even when the UE processing time is short, UL transmission can be performed at an appropriate timing without limiting the TA value.
- a predetermined time unit (eg, subframe, slot, minislot, sTTI, etc.) is expressed as TTI.
- the TTI may be specified by a predetermined index (for example, a subframe index, a slot index, a minislot index, an sTTI index, etc.).
- the TTI may be called a long TTI or a short TTI.
- the UE first performs scheduling / HARQ timing after receiving a predetermined downlink signal (based on the timing at which the predetermined downlink signal is received) from the reception of a predetermined downlink signal first, regardless of the value of TA. Is determined to be available timing.
- the predetermined period may be called a minimum processing time, a minimum required processing time, a downlink processing time, a terminal processing time, or the like.
- the UE fixedly determines the scheduling / HARQ timing to be a TTI after a predetermined number of indexes from the TTI index (the TTI index of the corresponding UL subframe) that received the predetermined downlink signal. Rather, the determination is made based on the time difference from reception of a predetermined downlink signal to uplink transmission.
- the UE may determine that the UL transmission timing is a time after a predetermined period with reference to the reception timing of DCI (UL grant) regardless of the value of TA. Further, the UE may determine that the HARQ transmission timing is a time after a predetermined period with reference to the reception timing of the downlink data signal (for example, PDSCH) regardless of the value of TA. When the predetermined period is in the middle of the TTI, the UE may determine that the next TTI (or subsequent TTI) after the predetermined period is the UL transmission timing.
- DCI UL grant
- the HARQ transmission timing is a time after a predetermined period with reference to the reception timing of the downlink data signal (for example, PDSCH) regardless of the value of TA.
- the UE may determine that the next TTI (or subsequent TTI) after the predetermined period is the UL transmission timing.
- based on reception (transmission) timing means “based on the end of the TTI to be received (transmitted)”, “based on the top of the TTI to be received (transmitted)”, and “received (transmitted)”. It may be read as “based on an arbitrary timing during TTI”.
- FIG. 4 is a diagram showing an example of the first mode. In this example, it is assumed that the UE requires 2 TTI or more for processing. In FIG. 4, the index of TTI is shown.
- the UE that has received the DL signal at TTI # n (# n + 6) is scheduled to the UL resource that can be used first after a predetermined period (for example, 2 TTI) from the end timing of the TTI # n (# n + 6). Data and / or HARQ feedback is mapped and transmitted.
- a predetermined period for example, 2 TTI
- the UL resource when the TA is 0, the UL resource may be a UL resource corresponding to TTI # n + 3 (# n + 9). When the TA is 0 or more and less than 1 TTI, the UL resource corresponds to TTI # n + 4 (# n + 10). It may be a UL resource, and may be a UL resource corresponding to TTI # n + 5 (# n + 11) when TA is 1 or more and less than 2 TTI.
- the predetermined period may be defined including the time interval of the TTI that receives the DL signal.
- the predetermined engine is defined with the timing at the end of TTI # n as the starting point, but it may be defined with the starting timing of TTI # n as the starting point.
- the predetermined period may be set independently for each cell, may be set independently for each specific UE group, may be set independently for each UE, It may be determined by.
- the information related to the predetermined period includes upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), physical layer signaling (for example, , DCI) or a combination thereof.
- RRC Radio Resource Control
- MAC Media Access Control
- MIB Master Information Block
- SIB System Information Block
- the UE may notify the network of information related to the predetermined period that can be taken as UE capability information.
- the information may be information regarding the processing time of a predetermined signal.
- the predetermined period, signaling regarding the predetermined period, and / or UE capability information regarding the predetermined period may not be a uniform value in all cases, but may be a different value depending on conditions.
- MIMO Multi-Input Multi-Output
- MCS Modulation and Coding Scheme
- allocated frequency resources for example, resource blocks
- It may be a large value (for example, three TTIs), or a small value (for example, two TTIs) if not.
- a larger value may be used if the number of symbols of a control resource set for performing blind decoding of a DL control channel (for example, PDCCH (Physical Downlink Control Channel)) is greater than a predetermined value, and a smaller value may be used otherwise.
- a large value may be used if the number of symbols in the UL transmission section (for example, PUCCH and / or PUSCH) is equal to or greater than a predetermined value, and a small value may be used otherwise. In this way, when the packet size is small, it is possible to apply a low delay timing to increase the speed, and when the packet size is large, it is possible to control to increase the capacity while allowing the delay.
- the predetermined period, signaling regarding the predetermined period, and / or UE capability information regarding the predetermined period may be defined as a value that is an integral multiple of the TTI length set in the terminal. It may be defined as a value that is an integral multiple of the OFDM symbol length to be used, or may be defined as a value that is an integral multiple of the sampling frequency applied by the terminal in transmission or reception.
- the “time difference” in the first aspect is the actual processing time of the UE required for preparation for scheduled UL transmission, and does not include TA.
- the UE when scheduling DCI is detected in subframe #n, the UE performs scheduled UL transmission in subframe # n + k.
- k is a fixed value, set by RRC, or instructed by DCI.
- the period of k subframes includes TA. For this reason, the minimum value of k or the maximum value of TA is limited depending on the processing capability of the UE.
- the index is obtained by rounding up scheduled UL transmission by n + k + TA value (unit is aligned with TTI). This is performed with a TTI corresponding to.
- k is, for example, the minimum processing time and is a fixed value, set by RRC, or instructed by DCI. In any case, the processing time of k subframes is always guaranteed regardless of the TA value. In other words, the TTI (TTI index) at which UL transmission occurs varies depending on the TA value.
- the maximum TA value and the processing time can be handled separately. For example, even if a plurality of UEs have different processing time capabilities and / or use different TTI lengths in a given cell, a large TA value can be used without problems for all UEs in the cell. .
- the UE determines scheduling / HARQ timing based on a dynamic indication by DCI.
- the DCI received at TTI # n does not indicate TTI # n + k as the scheduling / HARQ timing, but after a predetermined period (after the predetermined period) from the TTI at which DCI is detected (received), Indicate the k th TTI available for scheduled UL transmission and / or HARQ-ACK feedback for UL resources.
- the DCI may include information (which may be referred to as a field, transmission timing information, scheduling / HARQ timing information, etc.) for specifying the kth TTI that can use the UL resource.
- information which may be referred to as a field, transmission timing information, scheduling / HARQ timing information, etc.
- FIG. 5 is a diagram showing an example of the second mode. In this example, it is assumed that the UE requires 2 TTI or more for processing.
- the UE that has received the DL signal at TTI #n (# n + 6) corresponds to the TTI specified by DCI after a predetermined period (for example, 2 TTI) with reference to the end timing of the TTI #n (# n + 6).
- the scheduled data and / or HARQ feedback is mapped to the UL resource to be transmitted.
- the UE may be notified of information on the predetermined period, and may determine UL resources using the information.
- the transmission timing information includes TTIs after a predetermined period (here, 2 TTIs) after DCI is detected as the reference TTI (for example, the first (one after) TTI, It may also indicate whether it is the second (second after) TTI.
- the first, second, third and fourth timings of the table may correspond after 1, 2, 3 and 4 TTI, respectively.
- the UE that has received DCI at TTI # n is based on TTI # n + 3 after 2 TTIs based on the DCI, and after 4 TTIs after TTI # n + 4 after 1 TTI.
- UL data and / or HARQ may be transmitted using UL resources up to a certain # n + 7.
- the UE that has received DCI at TTI #n, based on TCI # n + 4 after 2 TTI, based on the DCI, TTI # n + 5 after 4 TTI and 4 TTI after UL data and / or HARQ may be transmitted using UL resources up to a certain # n + 8.
- the correspondence (table) between the field (index) included in the DCI and the timing of the UL resource may be set by higher layer signaling (for example, RRC signaling) or may be determined by specifications.
- the information regarding the said predetermined period may be notified from a base station similarly to the 1st aspect.
- FIG. 5 shows an example in which the field included in DCI is 2 bits, but is not limited thereto.
- the field may be 1 bit or 3 bits or more.
- the timing of the UL resource specified by DCI may include the predetermined period.
- a table in which a predetermined period (for example, 2TTI) is added to the timing described in the table of FIG. 5 may be set.
- the first, second, third and fourth timings in the table may correspond after 3, 4, 5 and 6 TTIs (based on the DCI reception timing), respectively.
- the UE does not need to be separately notified of information on the predetermined period, and may determine the UL resource based on the DCI and the table.
- the DCI including the above field is included only in DCI detected in one or a plurality of UE-specific search spaces (UE-specific search spaces), and another UE-specific search space or UE common search space (common search space) or DCI detected in the UE group search space may not be included.
- a UE that detects DCI that does not include the field performs UL transmission according to the DCI.
- the transmission timing may be a transmission timing when a predetermined processing time (for example, 3 TTI) is assumed. Good.
- the UE may determine that the scheduling / HARQ timing is the same TTI as the TTI that has received the predetermined downlink signal. It is suitable for UE having a faster processing time.
- the time length of the period in which scheduled transmission and / or HARQ feedback is performed may not be the same as the time length of a period in which a predetermined downlink signal is received, for example, a short time length. It may be a long time. As a result, flexible resource use is possible.
- FIG. 6 is a diagram illustrating an example of a modification of the second mode.
- the UE can perform scheduled transmission and / or HARQ feedback with the same TTI as the TTI that received the predetermined downlink signal.
- the index of TTI is shown.
- the DCI field indicates the same TTI as the TTI that received the DCI or the UL resource at the end of the subsequent TTI.
- the UE that has received the DCI at the index #n (# n + 6), based on the DCI, # n + 3 (# n + 9) after 3 TTIs from the same TTI #n (# n + 6) UL data and / or HARQ may be transmitted using the UL resource at the end of any of the TTIs.
- the UE that has received the DCI at the index #n is based on the DCI and takes # 3 + 1 (# n + 7), which is the same TTI in consideration of the TA, # n + 4 UL data and / or HARQ may be transmitted using a UL resource at the end of any TTI of (# n + 10).
- the UL resource used for scheduling and / or HARQ transmission may be mapped without including the end of a predetermined TTI, for example, may be mapped at the beginning.
- scheduling / HARQ timing can be determined so as to ensure the processing time of the UE.
- scheduling / HARQ timing is affected by TA adjustment. For example, if the TA value is at the boundary between two TTI UL resources, ambiguity may occur in scheduling / HARQ timing, and the base station may not be able to accurately identify the TTI that receives the UL signal. is there.
- a transmission timing determination method based on TTI (TTI index) (existing transmission timing determination method) or actual time difference based transmission is used so as to avoid the case where the above ambiguity occurs.
- the base station notifies the UE which of the timing determination methods (the transmission timing determination method of the first or second aspect) is used.
- the UE switches which method to use based on information notified from the base station.
- the notification may be performed by higher layer signaling (for example, RRC signaling) (aspect 3.1), may be performed by DCI (aspect 3.2), or may be performed by a combination of higher layer signaling and DCI. It may be performed (aspect 3.3).
- the TA is adjusted in the same manner as the existing LTE. That is, the TA adjustment is performed by a random access procedure message 2 (random access response), a TAC (timing advance command) MAC CE, autonomous adjustment by the UE, or the like.
- a random access procedure message 2 random access response
- TAC timing advance command
- the TA adjustment is performed using an unambiguous method (at least one of (1) to (3) below): (1 ) UE reports its TA value or observed DL-UL timing difference to the network using uplink L1 control information (UCI: Uplink Control Information), MAC CE, RRC signaling, etc. (2) UE (3) The UE is instructed in TA value by physical layer signaling (for example, TA information (TA indicator) included in DCI) or MAC CE.
- the TA value does not indicate a relative value with respect to the current TA value as in the conventional LTE, but may indicate an absolute value of the TA. In this case, it is possible to eliminate a recognition difference between the base station and the UE due to a TA command detection error.
- the UE may determine the scheduling / HARQ timing based on the existing transmission timing determination method, otherwise (scheduling) When DCI includes the above information), scheduling / HARQ timing may be determined based on an actual time difference based transmission timing determination method.
- the network can guarantee a reasonable range of TA values when scheduling DCI that does not include scheduling / HARQ timing information is used for UE scheduling.
- one or more of the transmission timing information included in the scheduling DCI may indicate scheduling / HARQ timing based on an existing transmission timing determination method.
- FIG. 7 is a diagram illustrating an example in which one piece of scheduling / HARQ timing information corresponds to scheduling / HARQ timing based on an existing transmission timing determination method.
- a predetermined field of DCI corresponds to “00”, “01”, or “10”
- an actual time difference based transmission timing determination method is used.
- the UE since the UE can switch between the existing transmission timing determination method and the actual time difference based transmission timing determination method, there is a mismatch in scheduling / HARQ timing between the UE and the base station. This can be suppressed.
- the UL transmission timing indicated by the UL grant has been described as an example of the controlled scheduling timing, but the scheduling timing is not limited to this.
- the scheduling timing to be controlled may be a DL reception timing indicated by a DL assignment, or UL transmission triggered by DCI (for example, a reference signal for uplink measurement (SRS: Sounding Reference Signal)) It may be the timing.
- DCI for example, a reference signal for uplink measurement (SRS: Sounding Reference Signal)
- 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. 8 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 in which a plurality of basic frequency blocks (component carriers (CC)) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are integrated and / or one or more Dual connectivity (DC) using a plurality of cell groups (CG) including CC can be applied.
- the wireless communication system 1 is called SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Radio Access Technology), etc. Also good.
- the radio communication system 1 shown in FIG. 8 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a-12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. .
- the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, two or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells.
- CC cells
- the user terminal 20 can perform communication using time division duplex (TDD) or frequency division duplex (FDD) in each cell.
- TDD time division duplex
- FDD frequency division duplex
- the TDD cell and the FDD cell may be referred to as a TDD carrier (frame configuration type 2), an FDD carrier (frame configuration type 1), and the like, respectively.
- each cell a single neurology may be applied, or a plurality of different neurology may be applied.
- the neurology is a parameter in the frequency direction and the time direction, such as a subcarrier interval, a symbol length, a cyclic prefix length, and a subframe length.
- 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 with a wide bandwidth in a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30-70 GHz, etc.
- the same carrier as that between the base station 11 and the base station 11 may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal. Further, the user terminal 20 can perform inter-terminal communication (D2D) with other user terminals 20.
- D2D inter-terminal communication
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the UL.
- a DL shared channel (PDSCH: Physical Downlink Shared Channel, also referred to as DL data channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- L1 / L2 control channels include DL control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), etc.), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Including.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH.
- Retransmission control information for example, at least one of A / N, NDI, HPN, and redundant version (RV)
- the UL signal for example, PUSCH
- Retransmission control information for example, at least one of A / N, NDI, HPN, and redundant version (RV)
- PUSCH Retransmission control information
- PHICH Physical Downlink Control Channel
- PDCCH Physical Downlink Control Channel
- a UL shared channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL data channel) shared by each user terminal 20, a UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used.
- User data and higher layer control information are transmitted by the PUSCH.
- Uplink control information including at least one of retransmission control information (eg, A / N), channel state information (CSI), and scheduling request (SR) of a DL signal (eg, PDSCH) is PUSCH. Or it is transmitted by PUCCH.
- the PRACH can transmit a random access preamble for establishing a connection with a cell.
- FIG. 9 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. Note that each of the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- the 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 transmitter / receiver, the transmission / reception circuit, or the transmission / reception device can be configured based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the UL signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction on UL data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.
- CPRI Common Public Radio Interface
- X2 interface also good.
- the transmission / reception unit 103 transmits DCI (DL assignment) for scheduling a DL shared channel (for example, PDSCH), DCI (UL grant) for scheduling a UL shared channel (for example, PUSCH), DL data (DL shared channel), and the like. May be.
- DCI DL assignment
- DL shared channel for example, PDSCH
- DCI UL grant
- UL shared channel for example, PUSCH
- DL data DL shared channel
- the transmission / reception unit 103 may receive retransmission control information (HARQ-ACK) of the DL shared channel. Further, the transmission / reception unit 103 may receive data using UL resources based on the UL grant.
- HARQ-ACK retransmission control information
- the transmission / reception unit 103 may transmit information regarding a predetermined period (minimum processing time), transmission timing information, and the like. Moreover, the transmission / reception part 103 may receive the information regarding the said predetermined period which can be taken.
- FIG. 10 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment of the present invention.
- FIG. 10 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
- the control unit 301 controls the entire radio base station 10.
- the control unit 301 includes, for example, DL signal generation by the transmission signal generation unit 302, DL signal mapping by the mapping unit 303, UL signal reception processing (for example, demodulation) by the reception signal processing unit 304, and measurement unit 305. Control the measurement.
- the control unit 301 may perform PUSCH and / or PDSCH scheduling for the user terminal 20.
- the control unit 301 may perform control such that downlink control information (DCI) for scheduling PUSCH and / or PDSCH is transmitted to the user terminal 20.
- DCI downlink control information
- control unit 301 may control the timing advance (TA) of the user terminal 20 or may control to transmit the TA value to the user terminal 20.
- the control unit 301 notifies the user terminal 20 of information for controlling the UL signal to be transmitted using the UL resource after a predetermined period on the basis of the timing at which the DL signal is received, regardless of the TA value. Also good.
- the UL signal may be HARQ-ACK for the data signal.
- the DL signal is DCI (UL grant) for scheduling UL transmission
- the UL signal may be a data signal (PUSCH).
- the predetermined period is determined in consideration of the processing time of the UE.
- the predetermined period may be set independently for each cell and / or for each user terminal.
- the control unit 301 uses the first method (actual time difference based transmission timing determination method (first or second) based on the timing at which the DL signal is received, regardless of the TA value, as a reference, using UL resources after a predetermined period. And a second method for transmitting a UL signal at a timing based on a TTI index with reference to a timing at which a DL signal is received (a transmission timing determining method based on a TTI (TTI index)) Information for causing the user terminal 20 to switch the transmission timing determination method)).
- first method actual time difference based transmission timing determination method (first or second) based on the timing at which the DL signal is received, regardless of the TA value, as a reference, using UL resources after a predetermined period.
- a second method for transmitting a UL signal at a timing based on a TTI index with reference to a timing at which a DL signal is received (a transmission timing determining method based on a TTI (TTI index))
- the control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- transmission signal generation unit 302 Based on an instruction from control unit 301, transmission signal generation unit 302 generates a DL signal (including DL data, DCI, UL data retransmission control information, and higher layer control information) and outputs the DL signal to mapping unit 303. .
- the transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 303 stores the DL signal generated by the transmission signal generation unit 302 (for example, DL data, DCI, UL data retransmission control information, higher layer control information, etc.) in a predetermined manner. And is output to the transceiver 103.
- the mapping unit 303 can be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the UL signal (for example, UL data, UCI, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 may output a reception signal or a signal after reception processing to the measurement unit 305.
- Reception signal processing section 304 performs reception processing on the A / N of the DL signal and outputs ACK or NACK to control section 301.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 measures the UL channel quality based on, for example, the reception power (for example, RSRP (Reference Signal Received Power)) and / or the reception quality (for example, RSRQ (Reference Signal Received Quality)) of the UL reference signal. May be.
- the measurement result may be output to the control unit 301.
- FIG. 11 is a diagram illustrating an example of the 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 for MIMO (Multi-Input Multi-Output) transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. ing.
- MIMO Multi-Input Multi-Output
- the radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202.
- Each transmitting / receiving unit 203 receives the DL signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the DL data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Broadcast information is also transferred to the application unit 205.
- UL data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, rate matching, puncturing, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Are transferred to each transmitting / receiving unit 203.
- UCI (for example, at least one of DL retransmission control information, CSI, and SR) is also subjected to channel coding, rate matching, puncturing, DFT processing, IFFT processing, and the like, and transferred to each transmitting / receiving section 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 receives DCI (DL assignment) for scheduling a DL shared channel (for example, PDSCH), DCI (UL grant) for scheduling a UL shared channel (for example, PUSCH), DL data (DL shared channel), and the like. May be.
- DCI DL assignment
- DL shared channel for example, PDSCH
- DCI UL grant
- UL shared channel for example, PUSCH
- DL data DL shared channel
- the transmission / reception unit 203 may transmit retransmission control information (HARQ-ACK) of the DL shared channel according to an instruction from the control unit 401. Further, the transmission / reception unit 203 may transmit data using resources based on the UL grant in accordance with an instruction from the control unit 401.
- HARQ-ACK retransmission control information
- the transmission / reception unit 203 may receive information on a predetermined period (minimum processing time), transmission timing information, and the like. Further, the transmission / reception unit 203 may transmit information regarding the predetermined period that can be taken.
- the transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. Further, the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- FIG. 12 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. 12 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. 12, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. I have.
- the control unit 401 controls the entire user terminal 20. For example, the control unit 401 controls generation of the UL signal by the transmission signal generation unit 402, mapping of the UL signal by the mapping unit 403, reception processing of the DL signal by the reception signal processing unit 404, and measurement by the measurement unit 405.
- the control unit 401 controls PDSCH reception and / or PUSCH transmission based on downlink control information (DCI) transmitted from the radio base station 10.
- the control unit 401 may control transmission of the UL signal for the DL signal based on the timing advance (TA). Further, the control unit 401 may perform control so that the UL signal is transmitted using the UL resource after a predetermined period with reference to the timing at which the DL signal is received, regardless of the TA value.
- DCI downlink control information
- the UL signal may be HARQ-ACK for the data signal.
- the DL signal is DCI (UL grant) for scheduling UL transmission
- the UL signal may be a data signal (PUSCH).
- the predetermined period is determined in consideration of the processing time of the UE.
- the predetermined period is offset to a period equal to the minimum terminal processing time or to the minimum terminal processing time (for example, the offset is a time until a new TTI starts after the minimum terminal processing time elapses). (Period) may be added.
- the predetermined period may be set independently for each cell and / or for each user terminal.
- the control unit 401 may control the transmission timing of the UL signal based on the transmission timing information of the UL signal included in the DCI.
- the control unit 401 uses a first method (actual time difference based transmission timing determination method (first or And a second method for transmitting a UL signal at a timing based on a TTI index with reference to a timing at which a DL signal is received (a transmission timing determining method based on a TTI (TTI index)) Control for switching between transmission timing determination method)) and the like may be performed.
- a first method actual time difference based transmission timing determination method (first or And a second method for transmitting a UL signal at a timing based on a TTI index with reference to a timing at which a DL signal is received (a transmission timing determining method based on a TTI (TTI index)) Control for switching between transmission timing determination method)
- the control unit 401 may perform the switching control based on information notified by higher layer signaling (Aspect 3.1), may be performed based on DCI (Aspect 3.2), It may be performed by a combination of higher layer signaling and DCI (Aspect 3.3).
- the control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates a UL signal (including UL data, UCI, UL reference signal, etc.) based on an instruction from the control unit 401 (for example, encoding, rate matching, puncturing, modulation, etc.). And output to the mapping unit 403.
- the transmission signal generation unit 402 may be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 403 maps the UL signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs it to the transmission / reception unit 203.
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (eg, demapping, demodulation, decoding, etc.) on the DL signal (DL data, DCI, higher layer control information, etc.).
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401.
- the reception signal processing unit 404 outputs, for example, broadcast information, system information, higher layer control information by higher layer signaling such as RRC signaling, physical layer control information (L1 / L2 control information), and the like to the control unit 401.
- the received signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the measurement unit 405 may measure the channel state based on a reference signal (for example, CRS and / or CSI-RS) from the radio base station 10 and output the measurement result to the control unit 401.
- a reference signal for example, CRS and / or CSI-RS
- the measuring unit 405 can be composed of a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device which are explained based on common recognition in the technical field according to the present invention.
- each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
- a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 13 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. It is realized by controlling the reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, 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 subframe may have a fixed time length (eg, 1 ms) that does not depend on the neurology.
- 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). Further, the slot may be a time unit based on the numerology.
- the slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. The minislot may also be called a subslot.
- Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol.
- one subframe may be called a transmission time interval (TTI)
- TTI transmission time interval
- a plurality of consecutive subframes may be called a TTI
- TTI slot or one minislot
- a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling for assigning 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), a code block, and / or a code word, or may be a processing unit such as scheduling or link adaptation.
- a time interval for example, the number of symbols
- a transport block, a code block, and / or a code word is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling unit. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- 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.
- a TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, or a subslot.
- a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI) is less than the TTI length of the long TTI and 1 ms. It may be replaced with a TTI having the above TTI length.
- 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 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.
- 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, minislot, symbol, etc. is merely an example.
- the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in the slot, the number of symbols and RBs included in the slot or minislot, and the RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
- PUCCH Physical Uplink Control Channel
- PDCCH Physical Downlink Control Channel
- information elements can be identified by any suitable name, so the various channels and information elements assigned to them.
- the name is not limiting in any way.
- information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer.
- Information, signals, and the like may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, a memory), or may be managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
- information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI downlink control information
- UCI uplink control information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
- the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
- the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
- software, instructions, information, etc. may be 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
- gNB gNodeB
- cell gNodeB
- cell group a base station
- carrier a base station
- component carrier a base station
- 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.
- the base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.
- RRH indoor small base station
- MS mobile station
- UE user equipment
- terminal may be used interchangeably.
- a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- NodeB NodeB
- eNodeB eNodeB
- access point transmission point
- reception point femtocell
- small cell small cell
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
- various operations performed for communication with a terminal may be performed by one or more network nodes other than the base station and the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
- the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction.
- the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark), The present invention may be applied to a system using other appropriate wireless communication methods and / or a next generation system extended based on these.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc.
- “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
- connection refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof.
- connection may be read as “access”.
- the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples It can be considered to be “connected” or “coupled” to each other, such as by using electromagnetic energy having wavelengths in the region, microwave region, and / or light (both visible and invisible) region.
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Abstract
Description
第1の態様では、UEは、スケジューリング/HARQタイミングを、TAの値に関わらず、所定の下り信号の受信から(所定の下り信号を受信したタイミングを基準として)所定期間後で最初にULリソースを利用可能なタイミングであると判断する。ここで、当該所定期間は、最低処理時間、最低必要処理時間、下りリンク処理時間、端末処理時間などと呼ばれてもよい。
第2の態様では、UEは、スケジューリング/HARQタイミングを、DCIによる動的な指示に基づいて判断する。ここで、TTI#nに受信されたDCIは、スケジューリング/HARQタイミングとしてTTI#n+kを指示するのではなく、DCIが検出(受信)されたTTIから所定期間後(所定期間以降)であって、ULリソースをスケジューリングされたUL送信及び/又はHARQ-ACKフィードバックのために利用可能なk番目のTTIを指示する。
上述の各態様において、UEは、スケジューリング/HARQタイミングを、所定の下り信号を受信したTTIと同じTTIであると判断してもよい。より高速な処理時間を有するUEに好適である。
上述の態様を用いると、UEの処理時間を確保するようにスケジューリング/HARQタイミングを決定できる。しかしながら、スケジューリング/HARQタイミングは、TAの調整によって影響を受ける。例えば、TA値が2つのTTIのULリソース間の境界にあるような場合、スケジューリング/HARQタイミングに曖昧さ(ambiguity)が生じ、基地局がUL信号を受信するTTIを正確に特定できなくなるおそれがある。
UEは、既存の送信タイミング決定方法を設定されると、TAの調整は既存のLTEと同様の方法で行われる。つまり、TAの調整は、ランダムアクセス手順のメッセージ2(ランダムアクセスレスポンス)、TAC(タイミングアドバンスコマンド) MAC CE、UEによる自律的な調整などによって実施される。
スケジューリングDCIが、第2の態様で述べたような送信タイミング情報を含まない場合、UEは、既存の送信タイミング決定方法に基づいてスケジューリング/HARQタイミングを判断してもよく、それ以外の場合(スケジューリングDCIが上記情報を含む場合)、実際の時間差ベースの送信タイミング決定方法に基づいてスケジューリング/HARQタイミングを判断してもよい。
第2の態様において、スケジューリングDCIに含まれる送信タイミング情報の1つ又は複数が、既存の送信タイミング決定方法に基づくスケジューリング/HARQタイミングを指示するものであってもよい。
上述の態様では、制御されるスケジューリングタイミングとして、ULグラントによって指示されるUL送信のタイミングを例に説明したが、スケジューリングタイミングはこれに限られない。例えば、制御されるスケジューリングタイミングは、DLアサインメントによって指示されるDL受信のタイミングであってもよいし、DCIによってトリガされるUL送信(例えば、上り測定用参照信号(SRS:Sounding Reference Signal))のタイミングであってもよい。
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9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てもよい。
図11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、MIMO(Multi-Input Multi-Output)伝送のための複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
なお、本明細書で説明した用語及び/又は本明細書の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル及び/又はシンボルは信号(シグナリング)であってもよい。また、信号はメッセージであってもよい。参照信号は、RS(Reference Signal)と略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(CC:Component Carrier)は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- DL信号を受信する受信部と、
タイミングアドバンスに基づいて前記DL信号に対するUL信号の送信を制御する制御部と、を有し、
前記制御部は、タイミングアドバンス値に関わらず、前記DL信号を受信したタイミングを基準として所定期間後のULリソースで前記UL信号を送信するように制御することを特徴とするユーザ端末。 - 前記所定期間は、セル毎及び/又はユーザ端末毎に独立して設定され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、下り制御情報に含まれる前記UL信号の送信タイミング情報に基づいて、前記UL信号の送信タイミング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、前記タイミングアドバンス値に関わらず前記DL信号を受信したタイミングを基準として所定期間後のULリソースで前記UL信号を送信する第1の方法と、前記DL信号を受信したタイミングを基準としてTTIインデックスに基づくタイミングで前記UL信号を送信する第2の方法と、を切り替え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、下り制御情報に基づいて前記第1の方法と前記第2の方法を切り替えることを特徴とする請求項4に記載のユーザ端末。
- ユーザ端末の無線通信方法であって、
DL信号を受信する受信工程と、
タイミングアドバンスに基づいて前記DL信号に対するUL信号の送信を制御する制御工程と、を有し、
前記制御工程は、タイミングアドバンス値に関わらず、前記DL信号を受信したタイミングを基準として所定期間後のULリソースで前記UL信号を送信す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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JP2018559498A JP7324004B2 (ja) | 2016-12-28 | 2017-12-26 | 端末、無線通信方法、基地局及びシステム |
EP17886967.3A EP3557931A4 (en) | 2016-12-28 | 2017-12-26 | USER TERMINAL AND WIRELESS COMMUNICATION METHOD |
CN201780087501.XA CN110366866B (zh) | 2016-12-28 | 2017-12-26 | 用户终端和无线通信方法 |
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- 2017-12-26 WO PCT/JP2017/046563 patent/WO2018124032A1/ja unknown
- 2017-12-26 KR KR1020197019899A patent/KR20190100240A/ko not_active Application Discontinuation
- 2017-12-26 US US16/473,690 patent/US20190327736A1/en not_active Abandoned
- 2017-12-26 RU RU2019121676A patent/RU2760210C2/ru active
- 2017-12-26 BR BR112019013312A patent/BR112019013312A2/pt unknown
- 2017-12-26 JP JP2018559498A patent/JP7324004B2/ja active Active
-
2019
- 2019-06-27 CL CL2019001801A patent/CL2019001801A1/es unknown
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US20160323070A1 (en) * | 2015-04-28 | 2016-11-03 | Qualcomm Incorporated | Low latency operation with different hybrid automatic repeat request (harq) timing options |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2020035947A1 (ja) * | 2018-08-17 | 2021-08-26 | 株式会社Nttドコモ | 無線通信装置及び無線通信方法 |
JP7204288B2 (ja) | 2018-08-17 | 2023-01-16 | 株式会社Nttドコモ | ノード、無線通信方法及びシステム |
JP2021516496A (ja) * | 2018-08-29 | 2021-07-01 | オッポ広東移動通信有限公司Guangdong Oppo Mobile Telecommunications Corp., Ltd. | 無線通信方法及び通信装置 |
US11664950B2 (en) | 2018-08-29 | 2023-05-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Wireless communications method and communications device |
Also Published As
Publication number | Publication date |
---|---|
RU2019121676A (ru) | 2021-01-29 |
CN110366866A (zh) | 2019-10-22 |
RU2760210C2 (ru) | 2021-11-22 |
EP3557931A1 (en) | 2019-10-23 |
KR20190100240A (ko) | 2019-08-28 |
CN110366866B (zh) | 2024-01-09 |
JP7324004B2 (ja) | 2023-08-09 |
CL2019001801A1 (es) | 2019-09-23 |
RU2019121676A3 (ja) | 2021-01-29 |
US20190327736A1 (en) | 2019-10-24 |
JPWO2018124032A1 (ja) | 2019-10-31 |
BR112019013312A2 (pt) | 2019-12-17 |
EP3557931A4 (en) | 2020-01-01 |
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