WO2017150453A1 - 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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- WO2017150453A1 WO2017150453A1 PCT/JP2017/007512 JP2017007512W WO2017150453A1 WO 2017150453 A1 WO2017150453 A1 WO 2017150453A1 JP 2017007512 W JP2017007512 W JP 2017007512W WO 2017150453 A1 WO2017150453 A1 WO 2017150453A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
- H04W8/20—Transfer of user or subscriber data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
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
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- LTE Rel In wireless communication systems (e.g., 5G) after 13th, wireless frames having high future expandability and excellent power consumption are being studied. In such a radio frame, it is considered to transmit signals together in a short time as much as possible so that communication is not performed when there is no data to be transmitted / received. For this reason, for example, realizing ultra-low delay feedback of 1 ms or less has been studied.
- the present invention has been made in view of such a point, and even when a radio frame configuration that requires short-time feedback is used, a user terminal, a radio base station, and a radio that can realize appropriate communication.
- One object is to provide a communication method.
- the user terminal which concerns on 1 aspect of this invention is a user terminal in the system which performs communication based on a transmission time interval (TTI: Transmission Time Interval) length, Comprising: The transmission / reception which transmits and / or receives the capability information regarding the delay which can be supported And a control unit that controls to receive a predetermined downlink radio resource and / or transmit a predetermined uplink radio resource at a time interval equal to or longer than the delay.
- TTI Transmission Time Interval
- FIG. 2A and 2B are diagrams illustrating an example of HARQ-ACK timing in an existing LTE system.
- 3A and 3B are diagrams illustrating an example of a configuration of a lean radio frame.
- 4A to 4C are diagrams illustrating an example of a self-contained TTI configuration.
- 5A to 5C are diagrams illustrating an example of a TTI configuration for DL data.
- 6A to 6C are diagrams showing an example of a TTI configuration for UL data.
- 7A and 7B are diagrams illustrating an example of comparing intra-TTI scheduling and inter-TTI scheduling.
- 8A to 8C are diagrams illustrating another example of comparing intra-TTI scheduling and inter-TTI scheduling.
- 9A to 9C are diagrams illustrating examples of TTI configurations of other physical channels / physical signals. It is a figure which shows an example of schematic structure of the radio
- 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
- 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, Although it may be called downlink scheduling control information) is called DL grant, 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 subframe may be called a transmission time interval (TTI).
- TTI transmission time interval
- LTE Rel LTE Rel.
- the TTI (subframe) length in 8-12 is 1 ms, and is composed of two time slots.
- the TTI is a transmission time unit of a channel-encoded data packet (transport block), and is a processing unit such as scheduling and link adaptation (Link Adaptation).
- FIG. 1 shows an example in which UL / DL grant is notified by PDCCH, but even in the case of EPDCCH, the correspondence relationship between the scheduled TTI and the scheduled TTI is the same as in FIG. Also, carriers (component carrier (CC: Component Carrier), cell) that transmit and receive DL grant and PDSCH are not the same, and may be different carriers. Moreover, the carrier which transmits / receives UL grant and PUSCH may be the same, and a different carrier may be sufficient.
- CC Component Carrier
- the existing LTE system uses control based on TDD (Time Division Duplex) or FDD (Frequency Division Duplex). Specifically, for time / frequency resources, whether to use for DL or UL is strictly defined for each predetermined unit (for example, subframe for time resource, CC for frequency resource, etc.).
- HARQ Hybrid Automatic Repeat reQuest
- the transmission side retransmits data by feedback of acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK (A / N: Acknowledgement / Negative-Acknowledgement), etc.) from the reception side. It is possible to determine whether to perform new data transmission.
- acknowledgment information for example, retransmission control information, HARQ-ACK, ACK / NACK (A / N: Acknowledgement / Negative-Acknowledgement), etc.
- the acknowledgment information may be notified by not transmitting ACK / NACK (discontinuous transmission (DTX)). That is, if the receiver (eNB or UE) cannot detect ACK / NACK from the transmitter (UE or eNB), it can interpret that the corresponding data delivery confirmation information is NACK.
- DTX discontinuous transmission
- FIG. 2 is a diagram illustrating an example of HARQ-ACK timing in an existing LTE system.
- FIG. 2A shows HARQ-ACK transmission timing corresponding to DL scheduling based on DL grant.
- the UE After receiving the PDSCH, the UE transmits HARQ-ACK in principle after 4 subframes or later. Note that, as shown in FIG. 2A, HARQ-ACK may support frequency hopping.
- FIG. 2B shows HARQ-ACK transmission timing corresponding to UL scheduling based on UL grant.
- the UE receives the HARQ-ACK in principle after 4 subframes after transmitting the PUSCH.
- LTE Rel In wireless communication systems (e.g., 5G) after 13th, wireless frames having high future expandability and excellent power consumption are being studied.
- one of such radio frames is a sparse radio frame (lean radio frame).
- lean radio frame In a system using lean radio frames, signals can be transmitted together in as short a time as possible so that communication is not performed when there is no data to be transmitted / received.
- a TTI in which self-contained allocation is performed may be referred to as a self-contained TTI (self-contained TTI).
- the self-contained TTI may be called, for example, a self-contained subframe, a self-contained symbol set, or another name may be used. Further, TDD using self-contained TTI may be referred to as self-contained TDD (self-contained TDD), or other names may be used.
- one self-contained TTI for example, transmission and / or reception of downlink control information, transmission and / or reception of data based on the downlink control information, and transmission of predetermined information (for example, feedback information corresponding to data) And / or reception is performed by the UE or eNB.
- predetermined information for example, feedback information corresponding to data
- ultra-low delay feedback requires high-speed signal processing (for example, demodulation, signal generation, etc.) in the UE or eNB. For this reason, considering the implementation cost, it is assumed that there are UEs and eNBs that cannot perform ultra-low delay feedback.
- a UE / eNB that has the ability to process signals at high speed may not be able to implement ultra-low delay feedback depending on conditions (for example, depending on the processing content and environment).
- high-performance terminals advanced receivers
- high-performance reception processing for example, interference cancellation
- terminals that require long-term channel estimation in a high-speed moving environment and cells with a very large cell radius Since terminals that communicate with each other have a large communication delay (including feedback delay, processing delay, etc.), the time required for signal processing is shortened.
- control is performed assuming that such feedback is performed for a UE that cannot perform ultra-low delay feedback, processing cannot be completed within the intended time, communication quality deteriorates, and appropriate communication is performed. I can't do it.
- the present inventors have conceived that the UE and / or eNB transmits capability information (capability) regarding delays that can be supported.
- a device that has received the capability information can grasp the delay that can be supported by the device of the communication partner, so that communication can be realized with an appropriate radio frame configuration (including a TTI configuration). can do.
- the capability information related to the delay that can be supported may be called, for example, delay capability, round-trip time (RTT) capability, or the like.
- the subframe may be a TTI (TTI having a time length of 1 ms) in an existing LTE (for example, LTE Rel. 8-12) or a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms.
- TTI shorter than 1 ms may be referred to as a shortened TTI.
- FIG. 3 is a diagram illustrating an example of a configuration of a lean radio frame.
- FIG. 3A shows an example of dynamic allocation (for example, scheduling in units of TTI)
- FIG. 3B shows semi-dynamic allocation (for example, scheduling in units of radio frames or multiple TTIs). An example is shown.
- the radio frame length is set to a predetermined length (for example, 10-40 ms).
- the TTI is set to a shortened TTI of, for example, 0.1 to 0.25 ms. Note that the radio frame length and the TTI length are not limited to the example of FIG.
- a carrier using a lean radio frame may be referred to as a lean carrier
- discovery detection
- / or mobility control using a low overhead signal is supported.
- the signal may be called, for example, a detection signal, a detection measurement signal, a mobility measurement signal, a discovery reference signal (DRS: Discovery Reference Signal), a discovery signal (DS: Discovery Signal), or the like.
- DRS Discovery Reference Signal
- DS Discovery Signal
- Lean radio frame DS is LTE Rel. 12 may be configured based on the DS, the synchronization signal (PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), the cell-specific reference signal (CRS) and the channel state information. It may be configured to include at least one of reference signals (CSI-RS: Channel State Information Reference Signal). Note that the DS configuration is not limited to this, and may be a signal obtained by modifying / extending an existing DS, or may be configured to include signals / information necessary for communication.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- CRS Cell-specific reference signal
- CSI-RS Channel State Information Reference Signal
- the UE tries to receive the DS at the top TTI of each radio frame.
- the UE may perform synchronization processing and / or measurement (for example, RRM (Radio Resource Management) measurement including RSRP (Reference Signal Received Power) measurement) based on the DS.
- a TTI in which a DS is transmitted may be called a discovery signal TTI (DS-TTI), a discovery signal subframe (DS subframe), or the like.
- the DS-TTI configuration is not limited to the example of FIG.
- the DS may be transmitted with an arbitrary TTI of a radio frame, or may be transmitted with a plurality of TTIs.
- radio resource allocation is performed dynamically using a self-contained TTI.
- the UE tries to receive a downlink control signal (for example, L1 / L2 control information) in each TTI, and when decoding is successful, based on the downlink control signal, the UE transmits and / or receives a signal in the same TTI. carry out.
- a downlink control signal for example, L1 / L2 control information
- radio resource allocation is performed semi-dynamically based on a downlink signal transmitted by DS-TTI.
- the UE receives and receives at least one of broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.)), downlink control information (DCI, etc.) or a combination thereof by DS-TTI.
- MIB Master Information Block
- SIB System Information Block
- DCI downlink control information
- radio resource allocation related to a predetermined TTI other than DS-TTI may be determined.
- FIG. 4 is a diagram illustrating an example of a self-contained TTI configuration.
- FIG. 4A shows a schematic diagram of radio resource allocation according to self-contained TTI.
- One self-contained TTI includes a downlink control signal section (which may be referred to as an allocation section, a scheduling section, or a downlink control channel area) in which a downlink control signal is allocated, and a data section (which is referred to as a data area or the like) in which data is allocated.
- a feedback interval (which may be called an uplink control channel interval, HARQ-ACK (A / N) interval, feedback channel region, etc.) in which a feedback signal is arranged.
- each section may be referred to as a self-contained TTI.
- a TTI composed of at least one section for example, a data section
- a method for controlling each section length will be described later.
- FIG. 4B shows an example of a radio resource arrangement for DL data (for DL data transmission) self-contained TTI.
- the UE receives scheduling information (DL grant) using a downlink control channel (eg, PDCCH) in a downlink control signal interval, and transmits data based on the DL grant in the data interval.
- a downlink control channel eg, PDCCH
- an uplink control signal (for example, A / N) is transmitted in response to the reception of the data.
- FIG. 4C shows an example of radio resource allocation related to a self-contained TTI for UL data (for UL data transmission).
- the UE receives scheduling information (UL grant) in the downlink control signal interval, transmits data based on the UL grant in the data interval, and further receives an uplink control signal (in the feedback interval). For example, A / N) of another subframe is transmitted.
- the UE may receive a downlink control signal (for example, A / N transmitted from the eNB in response to reception of uplink data) in the feedback period.
- the downlink control signal section and the feedback section may overlap in time.
- a non-transmission period for example, a guard period (GP: Guard Period), a gap, a switching gap, a GP section, or the like
- GP Guard Period
- UL / DL can be switched within the TTI.
- GP is introduced on the assumption that the UE applies timing advance (TA). Note that TA may be set to a value larger than 0 as the minimum value.
- a GP having a predetermined length may be set between the transmission period and the reception period of the UE.
- FIG. 4B shows an example in which a guard period is provided between a data section and a feedback section in the DL data self-contained TTI.
- FIG. 4C shows an example in which a guard period is provided between the downlink control signal section and the data section in the self-contained TTI for UL data.
- a GP may be provided between other sections. When it is set as the structure which provides several GP in self-contained TTI, the length of each GP may be the same and may differ.
- GP may be one or more symbol periods.
- the symbol period may be expressed in, for example, OFDM (Orthogonal Frequency Division Multiplexing) / SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol units, or a reciprocal of a predetermined bandwidth (ie, sampling length) ) May be expressed in units, or may be expressed in other units.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- an arbitrary channel / signal may be transmitted using a predetermined resource.
- uplink control information (UCI) other than A / N (for example, CQI (Channel Quality Indicator), RI (Rank Indicator), etc.)
- uplink reference signals uplink data, etc.
- uplink control information uplink reference signals, uplink data, and the like may be transmitted.
- a / N for uplink data downlink control information for the next TTI (next TTI), measurement signal (for example, cell-specific reference signal (CRS))
- measurement signal for example, cell-specific reference signal (CRS)
- CRS cell-specific reference signal
- CSI-RS Channel State Information-Reference Signal, etc.
- the UE attempts blind detection of DL and / or UL grant, or measures a predetermined reference signal set in advance by upper layer signaling (for example, RRC (Radio Resource Control) signaling). May be.
- RRC Radio Resource Control
- radio resource allocation for symbols included in each TTI can be controlled completely dynamically.
- the UE dynamically changes the UL / DL ratio in the TTI according to the content of the downlink control signal received in the downlink control signal section of the self-contained TTI.
- FIG. 5 is a diagram illustrating an example of a TTI configuration for DL data.
- FIG. 5 shows an example in which 1 TTI is composed of 14 symbols (for example, 14 OFDM symbols), but is not limited thereto.
- Each TTI is preferably configured with a number of symbols that can sufficiently secure temporal granularity (degree of freedom of symbol change), and at least one symbol is preferably used in the downlink control signal section.
- the downlink control information (for example, DCI) notified to the UE in the downlink control signal section is, for example, a self-contained TTI configuration (for example, each section length (downlink control signal section, data section, feedback section, GP length)). And the amount of radio resources used in at least one of each section).
- the information related to the section length include the first symbol, the last symbol, the number of symbols, and the symbol length of the section.
- the downlink control information preferably includes information related to signal transmission and / or reception processing (eg, modulation, demodulation, precoding, scramble identifier, etc.).
- the UE receives a downlink control signal (for example, DL grant, UL grant) for specifying a symbol position in the data interval and / or feedback interval in the downlink control signal interval, and determines the TTI configuration (TTI symbol configuration). .
- a downlink control signal for example, DL grant, UL grant
- TTI configuration TTI symbol configuration
- each TTI may not be dynamically controlled.
- at least a part of the information related to the configuration of the self-contained TTI may be notified to the UE by higher layer signaling (for example, RRC signaling, broadcast information).
- higher layer signaling for example, RRC signaling, broadcast information.
- a configuration may be adopted in which a part of a section is fixedly used in advance.
- the UE and / or eNB performs transmission and / or reception processing assuming that at least the first symbol is a downlink control signal section. May be.
- the TTI configuration in FIG. 5A can be used as the basic configuration of the DL data TTI.
- the first symbol of TTI is a downlink control signal period
- the 2-12th symbol is a data period (a period for receiving a downlink data signal)
- the 13th symbol is GP
- the 14th symbol is a feedback period. (Section in which an uplink control signal is transmitted).
- the TTI configuration of FIG. 5B can be used as a low overhead configuration of a TTI for DL data.
- the first symbol of TTI is a downlink control signal section
- the 2-14th symbol is a data section.
- the TTI configuration in FIG. 5C can be used as a feedback-oriented configuration of the TTI for DL data.
- the first symbol of the TTI is a downlink control signal section
- the 2-10th symbol is a data section
- the 11th symbol is GP
- the 12-14th symbol is a feedback section.
- FIG. 6 is a diagram showing an example of a TTI configuration for UL data.
- FIG. 6 shows an example in which 1 TTI is composed of 14 symbols (for example, 14 OFDM symbols), but it is not limited to this as in FIG.
- the downlink control information notified to the UE in the downlink control signal section may be the same as the example in FIG.
- the UE receives a downlink control signal (for example, UL grant) for specifying a symbol position in the data interval and / or feedback interval in the downlink control signal interval, and determines the TTI configuration (TTI symbol configuration).
- a downlink control signal for example, UL grant
- TTI configuration TTI symbol configuration
- the TTI configuration in FIG. 6A can be used as the basic configuration of the UL data TTI.
- the first symbol of TTI is a downlink control signal section
- the second symbol is GP
- the 3-13th symbol is a data section (a section for transmitting an uplink data signal)
- the 14th symbol is a feedback section. (Section in which an uplink control signal is transmitted). *
- the TTI configuration of FIG. 6B can be used as a low overhead configuration of a TTI for UL data.
- the first symbol of TTI is a downlink control signal section
- the second symbol is GP
- the 3-14th symbol is a data section.
- the TTI configuration in FIG. 6C can be used as a feedback-oriented configuration of the UL TTI.
- the first symbol of TTI is a downlink control signal section
- the second symbol is GP
- the 3-11th symbol is a data section
- the 12-14th symbol is a feedback section.
- a non-self-contained TTI for example, an existing DL subframe, a UL subframe, or the like
- performance for example, communication throughput
- the lean radio frame is not limited to intra-TTI scheduling using self-contained TTI, and scheduling between TTIs may be performed using a downlink control signal of a predetermined TTI. For example, scheduling of other subframes (cross subframe scheduling) or scheduling of multiple subframes (multisubframe scheduling) may be performed.
- FIG. 7 is a diagram illustrating an example of comparing intra-TTI scheduling and inter-TTI scheduling.
- FIG. 7A shows an example in which the self-contained TTI for DL data as shown in FIG. 4B continues in time.
- processing from reception of scheduling information to transmission of feedback information is completed within each TTI, which is preferable when priority is given to low delay.
- FIG. 7B shows an example in which a plurality of non-self-contained TTIs are followed by a self-contained TTI for DL data.
- the TTI configuration by using a non-self-contained TTI that does not have a GP or a feedback interval, it is possible to increase radio resources allocated to data transmission, which is preferable when priority is given to performance.
- a / Ns corresponding to non-self-contained TTI data are transmitted together in a subsequent self-contained TTI feedback section.
- the UE may generate A / N by applying at least one of HARQ-ACK multiplexing and HARQ-ACK bundling as used in the existing LTE system.
- FIG. 8 is a diagram showing another example of comparing intra-TTI scheduling and inter-TTI scheduling.
- the feedback section has been described as having a length of 0, but the present invention is not limited to this.
- FIG. 8A shows an example in which the self-contained TTI for UL data as shown in FIG. 4C is temporally continuous. According to the TTI configuration, the processing from the reception of scheduling information to the transmission of data is completed within each TTI, which is preferable when priority is given to low delay.
- FIG. 8B shows an example similar to FIG. 8A, except that data of another TTI (for example, the next TTI) is scheduled with downlink control information of a predetermined TTI.
- scheduling freedom can be increased by allowing a slightly longer delay.
- FIG. 8C shows an example in which a plurality of non-self-contained TTIs follow a self-contained TTI for UL data.
- scheduling information of each TTI is transmitted together in the downlink control signal section of the self-contained TTI, only data can be transmitted in the non-self-contained TTI.
- radio resources allocated for data transmission can be increased, which is suitable when priority is given to performance.
- the scheduling shown in FIGS. 7 and 8 can be used regardless of whether the TTI configuration is for DL data or UL data. Further, scheduling may be performed between the DL data TTI and the UL data TTI.
- TTI configuration related to the data signal and the control signal used in the lean radio frame has been mainly described.
- the same TTI configuration can be used for other physical channels and physical signals. That is, the data section and the feedback section may be read and used as sections for other physical channels / physical signals.
- FIG. 9 is a diagram showing an example of the TTI configuration of other physical channels / physical signals.
- FIG. 9 shows an example in which 1 TTI is composed of 14 symbols (for example, 14 OFDM symbols), but it is not limited to this as in FIG.
- the downlink control information notified to the UE in the downlink control signal section may be the same as in FIG.
- the UE receives a downlink control signal for specifying a symbol position in another physical channel / physical signal section in the downlink control signal section, and determines the TTI configuration (TTI symbol configuration).
- the TTI configuration in FIG. 9A can be used as a TTI configuration that dynamically allocates a random access channel (PRACH).
- PRACH random access channel
- the first symbol of TTI is a downlink control signal section
- the second symbol is GP
- the 3-13th symbol is a PRACH signal (random access preamble) transmission section
- the 14th symbol is GP. ing.
- the UE transmits a PRACH signal in at least a part (for example, one or a plurality of symbols) of a PRACH signal transmission section based on downlink control information.
- the PRACH signal may be transmitted using a randomly determined resource (collision type random access), or may be transmitted using a resource specified by downlink control information (also referred to as a PDCCH instruction or the like) ( Non-collision type random access).
- GP is preferably set after the PRACH signal transmission section.
- the delay margin which considered the difference, such as a cell radius, regarding reception of a PRACH signal can be ensured.
- the TTI configuration in FIG. 9B can be used as a TTI configuration that dynamically allocates an uplink measurement reference signal (SRS: Sounding Reference Signal).
- SRS uplink measurement reference signal
- the first symbol of the TTI is a downlink control signal section
- the second symbol is GP
- the 3-13th symbol is an uplink SRS transmission section
- the 14th symbol is a feedback section.
- the TTI configuration in FIG. 9C can be used as a TTI configuration that dynamically assigns a downlink measurement reference signal (for example, a channel state information reference signal (CSI-RS)).
- a downlink measurement reference signal for example, a channel state information reference signal (CSI-RS)
- the first TTI symbol is a downlink control signal interval
- the 2-10th symbol is a downlink CSI-RS transmission interval
- the 11th symbol is GP
- the 12-14th symbol is a feedback interval. ing. This allows the UE to perform CSI measurement and reporting (self-contained) within 1 TTI.
- control of the above-described radio frame configuration and TTI configuration is performed based on capability information (delay capability) regarding delay that can be supported.
- the delay capability is information on at least one of, for example, a supportable feedback delay, a processing delay, and a TTI length.
- the feedback delay may be, for example, a round trip delay time (RTT) between the eNB and the UE, a one-way delay time from the UE to the eNB, a one-way delay time from the eNB to the UE, and the like.
- RTT round trip delay time
- the eNB and / or the UE may set a feedback delay that can be supported as a preset value or may be obtained from a value measured in an actual environment. For example, the eNB and / or the UE may measure the time from transmission of a predetermined signal to reception of the corresponding signal as RTT.
- the processing delay represents the time taken for the eNB and / or UE to perform a predetermined process.
- the eNB and / or the UE may support a process delay that can be supported as a preset value or may be obtained from a value measured in an actual environment.
- the information related to the TTI length may be, for example, the minimum TTI length that can be supported in consideration of the processing delay or the feedback delay, or the maximum TTI length corresponding to the limit time for waiting for the delay.
- the delay capability may be information on a delay combining a supportable feedback delay, a processing delay, or the like, or may be information on another delay.
- the delay capability may be a delay required (or may be required) from when the UE receives a predetermined downlink signal until it transmits a predetermined uplink signal.
- the delay capability may be information on a delay required (or may be required) from when the UE receives a downlink data signal until the UE transmits an uplink control signal, or the UE performs downlink control. It may be information regarding a delay required (or may be required) from receiving a signal to transmitting an uplink data signal.
- the UE can support the delay that the terminal can support, such as the surrounding environment (cell radius of the serving cell (cell used for communication)), communication parameters (subcarrier interval, symbol length, etc.), communication quality (channel state, etc.), transmission, etc. / Determining based on receiving processing (demodulation, decoding, etc., processing load such as high load / low load, etc.), signal to be transmitted / received (signal type, channel used, radio resource, etc.)
- the delay capability related to the delay that the terminal can support is transmitted to the network (for example, eNB).
- the eNB performs scheduling of the UE based on the delay capability notified from the UE. For example, the eNB performs scheduling of the UE so as to perform communication using a TTI configuration having a TTI length equal to or longer than the delay supported by the UE (or larger than the delay).
- the UE receives a predetermined downlink radio resource (for example, a downlink control signal section) and / or at a time interval (TTI) equal to or greater than the delay indicated by the delay capability based on the downlink control signal notified from the eNB. Control is performed to transmit a predetermined uplink radio resource (for example, a feedback interval).
- the eNB determines the delay that can be supported by the own device (cell formed by the own device) based on the surrounding environment, communication parameters, communication quality, transmission / reception processing, signals to be transmitted / received, and the like. May transmit a delay capability related to a delay that can be supported to the UE. For example, the eNB acquires the distance to a predetermined UE based on geographical position information acquired by a GPS (Global Positioning System), a gyro sensor, a compass, and a transmission / reception signal. The delay capability to be supported may be determined.
- GPS Global Positioning System
- the UE may select at least one from the delay capabilities received from the eNB and report it to the eNB as the delay capability supported by the terminal itself. This eliminates the need for the UE to search for and report unnecessary delay capabilities that are not supported by the eNB (not used for the UE), thereby reducing the processing / communication overhead of the UE.
- Capabilities Capability categories
- delay capability 1 indicates delay capability when the UE performs normal reception processing (the reception processing amount is small)
- delay capability 2 indicates when the UE performs high-performance reception processing (the reception processing amount is large).
- the Capability category includes, for example, the surrounding environment (serving cell cell radius, etc.), communication parameters (symbol length, etc.), communication quality (channel state, etc.), transmission / reception processing contents (eg, transmission and / or reception signal processing amount, demodulation) Scheme, cancellation scheme, etc.), and transmission / reception signals (channels).
- the UE / eNB determines a condition to which each delay capability category is applied, and grasps a delay that can be supported by the counterpart apparatus under the condition.
- the delay capability may be associated with other user terminal capability information (UE Capability).
- UE Capability is UE capability information (transmission speed, bandwidth, number of antennas, etc.) defined by existing LTE, UE capability information (support for stand-alone connection, power consumption mode) defined by future LTE standards. Etc.) and may be jointly encoded.
- the other UE capability information itself associated with the delay capability is the delay capability (or information for specifying the delay capability).
- a given UE category (eg UE category 1) shows a transmission rate of 100 Mbps and a delay of 1 TTI
- another UE category eg UE category 2 shows a transmission rate of 1 Gbps and a delay of 0 TTI (uses self-contained TTI) It may be shown.
- the delay capability can be notified by notifying the index indicating the UE category.
- information on delays that can be supported can be shared between the eNB and the UE by the notification of delay capability. It can be controlled to communicate using the configuration.
- 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. 10 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. 10 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 that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).
- 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.
- 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 other radio access schemes may be used.
- 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. 11 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.
- the transmission path interface 106 can transmit and receive information transmitted from the user terminal 20, information transmitted to the user terminal 20, information held (generated) by the radio base station 10, and the like.
- the transmission / reception unit 103 may transmit information regarding delay capability, information regarding the configuration of the self-contained TTI, and the like to the user terminal 20. Further, the transmission / reception unit 103 may receive information related to delay capability from the user terminal 20.
- the transmission / reception unit 103 transmits downlink control information related to transmission and / or reception of a predetermined signal (for example, a data signal, feedback information) to the user terminal 20 in the downlink control signal section determined by the control unit 301.
- a predetermined signal for example, a data signal, feedback information
- the transmission / reception unit 103 may transmit instruction information (DL grant) for reception of the downlink shared channel (PDSCH) in the data section.
- the transmission / reception unit 103 may transmit instruction information (UL grant) for transmission of the uplink shared channel (PUSCH) in the data section.
- FIG. 12 is a diagram illustrating an example of a functional configuration of a radio base station 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 wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 12, 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. Further, the control unit 301 controls generation of a downlink control signal (for example, delivery confirmation information) and a downlink data signal based on a result of determining whether or not retransmission control is necessary for the uplink data signal.
- the control unit 301 also controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals such as CRS, CSI-RS, and DMRS.
- 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
- the control unit 301 determines the delay that can be supported by the radio base station 10 and / or the user terminal 20 based on, for example, at least one of the surrounding environment, communication parameters, communication quality, transmission / reception processing contents, and signals to be transmitted / received. It judges and controls so that the information regarding the delay capability regarding the delay which the radio base station 10 and / or the user terminal 20 can support is transmitted to the user terminal 20.
- control unit 301 returns the above judgment to information to be fed back to the user terminal 20 (eg, HARQ-ACK, channel state information), feedback information from the user terminal 20 (eg, HARQ-ACK, channel state information), etc. This may be performed based on information notified from the wireless base station 10, a measurement result by the measurement unit 305, or the like.
- control unit 301 acquires information on the delay capability notified from the user terminal 20 from the reception signal processing unit 304, the radio frame configuration and / or the TTI configuration used by the user terminal 20 based on the delay capability. In addition, the scheduling of the user terminal 20 can be controlled.
- the information on delay capability may be information that can directly specify delay capability (for example, information on at least one of feedback delay, processing delay, and TTI length that can be supported), or the delay capability can be indirectly specified. Such information (other UE capability information, UE category (UE category index), etc.).
- a plurality of types of information regarding delay capability may be defined depending on conditions.
- the delay capability corresponding to each condition may be referred to as a delay capability belonging to the capability category.
- Information regarding the category (for example, information for specifying a condition corresponding to the category) may be notified from the radio base station 10 to the user terminal 20.
- the control unit 301 controls to perform communication based on the TTI length that is equal to or greater than the delay value specified by the transmitted and / or received delay capability information. For example, the control unit 301 transmits and / or receives downlink control information (downlink control signal period), transmits and / or receives data (data period), and transmits and / or receives feedback information (section). Based on a self-contained TTI configuration consisting of a feedback interval), transmission and / or reception for each TTI (or each symbol) is controlled.
- downlink control information downlink control signal period
- data period data period
- section transmits and / or receives feedback information
- the control unit 301 includes information on the configuration of the self-contained TTI (for example, information on the section length and information on signal transmission and / or reception processing) in the downlink control information transmitted in the downlink control signal section. To control. That is, the control unit 301 generates downlink control information to be transmitted in the downlink control signal section based on the information on the delay capability transmitted and / or received.
- information on the configuration of the self-contained TTI for example, information on the section length and information on signal transmission and / or reception processing
- each section may be provided adjacent in time (the next section starts immediately after the previous section), or a non-transmission section (no reception section, guard section, GP) between each section. Etc.) may also be provided.
- control unit 301 generates various types of information such as information related to the configuration of the self-contained TTI, and notifies the user terminal 20 of higher layer signaling (for example, RRC signaling, broadcast information (MIB, SIB), etc.), downlink control information ( DCI or the like) or a combination of these may be used for control.
- higher layer signaling for example, RRC signaling, broadcast information (MIB, SIB), etc.
- DCI downlink control 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. 13 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, 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 may receive information on delay capability, information on the configuration of the self-contained TTI, and the like from the radio base station 10. Further, the transmission / reception unit 203 may transmit information regarding delay capability to the radio base station 10.
- the transmission / reception unit 203 receives downlink control information related to transmission and / or reception of a predetermined signal (for example, data signal, feedback information) from the radio base station 10 in the downlink control signal section determined by the control unit 401.
- a predetermined signal for example, data signal, feedback information
- FIG. 14 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- FIG. 14 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.
- the control unit 401 determines the delay that can be supported by the user terminal 20 based on, for example, at least one of the surrounding environment, communication parameters, communication quality, transmission / reception processing contents, and signals to be transmitted / received. Control is performed so that information regarding delay capability regarding possible delay is transmitted to the radio base station 10.
- control unit 401 acquires information on the delay capability notified from the radio base station 10 from the received signal processing unit 404, the control unit 401 determines information on the predetermined delay capability based on the delay capability, and the radio base station 10 may be controlled to be transmitted.
- the control unit 401 performs control so as to perform communication based on a TTI length equal to or greater than the delay value specified by the transmitted and / or received delay capability information (communication using a TTI having the TTI length). For example, the control unit 401 transmits and / or receives downlink control information (downlink control signal period), transmits and / or receives data (data period), and transmits and / or receives feedback information ( Based on a self-contained TTI configuration consisting of a feedback interval), transmission and / or reception for each TTI (or each symbol) is controlled.
- downlink control information downlink control signal period
- data data period
- feedback information Based on a self-contained TTI configuration consisting of a feedback interval
- control unit 401 may control transmission / reception processing in the data section and / or the feedback section based on downlink control information (including information on the configuration of the self-contained TTI) received in the downlink control signal section. .
- the control unit 401 can determine the length of each section in units of TTI and control to perform communication corresponding to each section.
- control unit 401 when the control unit 401 acquires various types of information such as information on the configuration of the self-contained TTI from the reception signal processing unit 404, the control unit 401 may update parameters used for control based on the information.
- 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) for scheduling transmission and / or reception of data (TB: Transport Block) based on an instruction from the control unit 401.
- DCI DCI format
- TB Transport Block
- the received signal processing unit 404 may be configured to perform blind decoding on different radio resources based on whether or not the self-contained TTI is used.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 may output the data decoding result to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 may measure, for example, the received power (for example, RSRP), 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 (components) are realized by any combination of hardware and / or software.
- the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- 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. 15 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.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store 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, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input.
- the output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 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.
- a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- the notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- the information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block), 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 RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- MAC CE Control Element
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable wireless communication methods and / or based on them It may be applied to an extended next generation system.
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Abstract
Description
まず、リーン無線フレームの構成について具体的に説明する。その後、リーン無線フレームで用いられる、柔軟に時間領域を変更したTTI構成(例えば、自己完結型TTI)について説明する。そして、遅延Capabilityに基づく無線フレーム構成の制御について説明する。
図3は、リーン無線フレームの構成の一例を示す図である。図3Aは動的な(dynamic)割り当て(例えば、TTI単位でのスケジューリング)の一例を示し、図3Bは準動的(semi-dynamic)な割り当て(例えば、無線フレーム又は複数TTI単位でのスケジューリング)の一例を示す。
リーン無線フレームでは、低遅延を実現するために、自己完結型TTIが用いられることが好ましい。図4は、自己完結型TTI構成の一例を示す図である。図4Aは、自己完結型TTIに係る無線リソース配置の模式図を示す。1つの自己完結型TTIは、下り制御信号を配置する下り制御信号区間(割当区間、スケジューリング区間、下り制御チャネル領域などと呼ばれてもよい)、データを配置するデータ区間(データ領域などと呼ばれてもよい)、及びフィードバック信号を配置するフィードバック区間(上り制御チャネル区間、HARQ-ACK(A/N)区間、フィードバックチャネル領域などと呼ばれてもよい)を含む。
本発明の一実施形態においては、各TTIに含まれるシンボルに対する無線リソース割り当てを完全に動的に制御することができる。例えば、UEは、自己完結型TTIの下り制御信号区間で受信する下り制御信号の内容に応じて、当該TTI内のUL/DL比率を動的に変更する。
リーン無線フレームでは、性能(例えば、通信スループット)と遅延とのトレードオフを考慮して、非自己完結型TTI(例えば、既存のDLサブフレーム、ULサブフレームなど)が用いられてもよい。また、リーン無線フレームでは、自己完結型TTIを用いたTTI内スケジューリングに限られず、所定のTTIの下り制御信号を用いて、TTI間スケジューリングが行われてもよい。例えば、他のサブフレームのスケジューリング(クロスサブフレームスケジューリング)や複数サブフレームのスケジューリング(マルチサブフレームスケジューリング)が行われてもよい。
ここまで、リーン無線フレームで用いられるデータ信号及び制御信号に関するTTI構成を主に説明してきたが、他の物理チャネルや物理信号についても同様なTTI構成を用いることができる。つまり、データ区間やフィードバック区間を、他の物理チャネル/物理信号用の区間として読み替えて用いてもよい。
本発明の一実施形態では、上述した無線フレーム構成やTTI構成の制御を、サポート可能な遅延に関する能力情報(遅延Capability)に基づいて実施する。遅延Capabilityは、例えば、サポート可能なフィードバック遅延、処理遅延、TTI長の少なくとも1つに関する情報である。
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11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13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。
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、物理的に結合した1つの装置により実現されてもよいし、物理的に分離した2つ以上の装置を有線又は無線で接続し、これら複数の装置により実現されてもよい。
Claims (10)
- 送信時間間隔(TTI:Transmission Time Interval)長に基づく通信を行うシステムにおけるユーザ端末であって、
サポート可能な遅延に関する能力情報を送信及び/又は受信する送受信部と、
前記遅延以上の時間間隔で所定の下り無線リソースの受信及び/又は所定の上り無線リソースの送信を行うように制御する制御部と、を有することを特徴とするユーザ端末。 - 前記能力情報は、下りデータ信号を受信してから上り制御信号を送信するまでに要する遅延に関する情報又は下り制御信号を受信してから上りデータ信号を送信するまでに要する遅延に関する情報であることを特徴とする請求項1に記載のユーザ端末。
- 前記能力情報は、フィードバック遅延、処理遅延、TTI長の少なくとも1つに関する情報であることを特徴とする請求項1に記載のユーザ端末。
- 前記能力情報は、他のユーザ端末能力情報と関連付けられていることを特徴とする請求項1に記載のユーザ端末。
- 前記送受信部は、受信した前記能力情報から選択された能力情報を送信することを特徴とする請求項1に記載のユーザ端末。
- 前記送受信部は、適用される条件が異なる複数の前記能力情報を送信及び/又は受信することを特徴とする請求項1に記載のユーザ端末。
- 前記能力情報が適用される条件は、通信に用いるセルのセル半径、通信パラメータ、通信品質、信号処理量の少なくとも1つで判断され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、下り制御信号を受信する区間と、受信した下り制御情報に基づいて長さが設定される区間と、を少なくとも含むTTIに基づいて通信を行うように制御する請求項1に記載のユーザ端末。
- 送信時間間隔(TTI:Transmission Time Interval)長に基づく通信を行うシステムにおける無線基地局であって、
サポート可能な遅延に関する能力情報を送信及び/又は受信する送受信部と、
前記遅延以上の時間間隔で所定の下り無線リソースの受信及び/又は所定の上り無線リソースの送信を行うように制御する制御部と、を有することを特徴とする無線基地局。 - 送信時間間隔(TTI:Transmission Time Interval)長に基づく通信を行うシステムにおけるユーザ端末の無線通信方法であって、
サポート可能な遅延に関する能力情報を送信及び/又は受信する工程と、
前記遅延以上の時間間隔で所定の下り無線リソースの受信及び/又は所定の上り無線リソースの送信を行うように制御する工程と、を有することを特徴とする無線通信方法。
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EP3425979B1 (en) | 2021-10-13 |
EP3425979A4 (en) | 2019-07-17 |
EP3425979A1 (en) | 2019-01-09 |
US10721615B2 (en) | 2020-07-21 |
RU2735647C2 (ru) | 2020-11-05 |
US20190069164A1 (en) | 2019-02-28 |
RU2018132603A3 (ja) | 2020-06-04 |
CN108713340A (zh) | 2018-10-26 |
RU2018132603A (ru) | 2020-04-01 |
JPWO2017150453A1 (ja) | 2018-12-20 |
JP6944927B2 (ja) | 2021-10-06 |
CN108713340B (zh) | 2023-06-06 |
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