WO2016182046A1 - ユーザ端末および無線通信方法 - Google Patents
ユーザ端末および無線通信方法 Download PDFInfo
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- WO2016182046A1 WO2016182046A1 PCT/JP2016/064236 JP2016064236W WO2016182046A1 WO 2016182046 A1 WO2016182046 A1 WO 2016182046A1 JP 2016064236 W JP2016064236 W JP 2016064236W WO 2016182046 A1 WO2016182046 A1 WO 2016182046A1
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- control unit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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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
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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
- FRA Full Radio Access
- LTE Long Term Evolution
- a license band For example, 800 MHz, 2 GHz, or 1.7 GHz is used as the license band.
- Rel. 13 operation in a license-free frequency band, that is, an unlicensed band is also considered as a target.
- the unlicensed band for example, the same 2.4 GHz or 5 GHz band as Wi-Fi is used.
- Rel. 13 LTE considers carrier aggregation (LAA: License-Assisted Access) between licensed and unlicensed bands, but dual connectivity and unlicensed band standalone may also be considered in the future. There is.
- LAA License-Assisted Access
- Wi-Fi implements a function called LBT (Listen Before Talk) or CCA (Clear-Channel Assessment).
- LBT Listen Before Talk
- CCA Cerar-Channel Assessment
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- a discovery reference signal (DRS) is transmitted within a DMTC (Discovery Measurement Timing Configuration) period for RRM (Radio Resource Management) measurement.
- DRS discovery reference signal
- DMTC Discovery Measurement Timing Configuration
- RRM Radio Resource Management
- the present invention has been made in view of such a point, and an object thereof is to provide a user terminal and a wireless communication method that can efficiently realize RRM measurement in LAA.
- a user terminal includes a control unit that controls transmission / reception of a signal on a first frequency carrier in which LBT (Listen Before Talk) is set, and a transmission / reception unit, and the control unit includes DMTC (Discovery Measurement).
- LBT Listen Before Talk
- DMTC Discovery Measurement
- the first frequency carrier is controlled not to detect the downlink control channel, but only to receive the discovery reference signal for RRM (Radio Resource Management) measurement. To do.
- RRM measurement in LAA can be realized efficiently.
- DRS transmission method It is a figure explaining the DRS transmission method. It is a figure explaining the DRS transmission method. It is a figure explaining the DRS transmission method. It is a figure explaining the DRS transmission method which concerns on this Embodiment. It is a figure explaining a DRS transmission candidate position and a DRS design example. It is a figure explaining the DRS transmission method which concerns on this Embodiment. It is a figure which shows an example of schematic structure of the radio
- a frequency carrier in which LBT is not set is described as a license band
- a frequency carrier in which LBT is set is described as an unlicensed band, but is not limited thereto. That is, the present embodiment can be applied regardless of the license band or the unlicensed band as long as it is a frequency carrier in which LBT is set.
- LBT operation may be required. For example, in Japan and Europe, an LBT operation is required before starting transmission in an unlicensed band.
- LBT busy when the received signal strength during the LBT period is higher than a predetermined threshold, the channel is regarded as being in a busy state (LBT busy ). If the received signal strength during the LBT period is lower than a predetermined threshold, the channel is considered idle (LBT idle ).
- LBT LBT-Based Equipment
- FBE Flash-Based Equipment
- LBT initial CCA is performed. If LBT idle , transmission starts, and if LBT busy , ECCA (Extended CCA) procedure is performed.
- FBE carrier sense is performed at a fixed timing and a fixed cycle. If LBT idle , transmission is started, and if LBT busy , it waits until the next carrier sense timing.
- a primary cell PCell: Primary Cell
- a primary secondary cell PSCell
- SCell Secondary Cell
- RRM Radio Resource Management
- the user terminal detects the SCell present in the vicinity by RRM (Radio Resource Management) measurement, and reports to the network after measuring the reception quality.
- RRM Radio Resource Management
- DRS discovery reference signal
- Alt. 1 and Alt. There are two candidates.
- Alt. 1, Rel. 12 Since DRS transmission of each cell is performed in a DMTC (Discovery Measurement Timing Configuration) cycle similarly to 12 DRS, the DRS transmission position in the DMTC cycle is fixed to one. Therefore, as a result of LBT, if transmission at a fixed timing is not successful because the channel is busy, the cell cannot transmit DRS until the next DMTC period.
- DMTC Discovery Measurement Timing Configuration
- DRS transmission of each cell is not necessarily performed in a fixed DMTC cycle, and the transmission position of the DRS within the DMTC cycle is variable. Therefore, as a result of LBT, even if transmission at the first candidate position is not successful because the channel is busy, there is a possibility that DRS can be transmitted at another candidate position within the same DMTC period.
- the assumption of the user terminal regarding the DRS transmission timing of each cell is Rel. 12 and Alt. Different from 1.
- DRS transmission is performed based on LBT including random backoff, such as Wi-Fi, that is, based on the LBE mechanism, a cell capable of transmitting DRS within the DMTC period because DRS transmission timing does not match between cells.
- the number will be limited. Even within the operator, the transmission of a certain eNB blocks DRS transmissions of other neighboring eNBs, so the number of DRS transmissions that can be made within the DMTC period is reduced.
- a random backoff counter is arranged between eNBs, there is a possibility that simultaneous transmission of DRS becomes possible.
- DRS resource mapping (RE (Resource Element) mapping) in LAA, Rel. 12
- RE Resource Element mapping
- Rel. 12 When trying to maintain resource mapping in DRS, in order to start DRS transmission from the subframe boundary, it is necessary to transmit a signal for reserving the channel from when the channel becomes idle until the subframe boundary. Yes (see FIG. 2). Sending such a signal is overhead and interference.
- it is possible to start DRS transmission as soon as the channel becomes idle without transmitting a channel reservation signal it is necessary to change the resource mapping of DRS with respect to the subframe configuration. It becomes complicated.
- the DMTC period is fixed to 6 [ms] length, and the DRS length can be set to 1 [ms] at the shortest and 5 [ms] at the longest. Therefore, including the LBT time, the number of cells that can transmit DRS in a DMTC period of 6 [ms] is less than six. If data burst transmission or the like by some cells or other systems is performed within the DMTC period, the DRS transmittable time (number of cells) within the DMTC period is further reduced (see FIG. 3). As shown in FIG. 3, DRS transmission of other neighboring cells is blocked by data burst transmission of a certain cell, so that the DRS transmittable number (transmittable position) is reduced.
- the DRS transmission timing is always matched between cells, and simultaneous transmission of DRS is performed, so that the synchronization signal in the DRS (PSS / SSS: Primary Synchronization Signal / Secondary Synchronization Signal ) Constantly collide between cells, which may affect the detection accuracy of a physical cell ID (PCID: Physical Cell ID) by a user terminal.
- PSS / SSS Primary Synchronization Signal / Secondary Synchronization Signal
- PCID Physical Cell ID
- the user terminal Since the LAA cell is always used as the SCell, the user terminal basically does not need to perform RRM measurement except for the cell that can be carrier-aggregated with the connected PCell.
- the cell that can be carrier-aggregated with the connected PCell is always in timing synchronization with the connected PCell. Therefore, by aligning the DRS transmission timings of a plurality of LAA cells and enabling simultaneous transmission, it is possible to increase the number of DRS transmittable cells in the DMTC period and to partially simplify the DRS detection processing of the user terminal.
- a DRS configuration and a DRS transmission method that increase the DRS transmittable positions and LBT opportunities are introduced.
- the DMTC cycle may be long, and the efficiency does not deteriorate so much even if the DMTC period cannot be used for data transmission.
- the DRS transmission success probability within the DMTC period can be increased by performing the inter-cell DRS simultaneous transmission within the DMTC period and not performing the data transmission. Also, by not performing data transmission within the DMTC period, user terminal operations such as blind detection of downlink control information (DCI: Downlink Control Information) within the DMTC period can be omitted.
- DCI Downlink Control Information
- the network can set a DMTC period and an offset for each unlicensed frequency for a connected user terminal capable of performing LAA.
- the network may additionally set the DMTC period. If the network does not specifically set the DMTC period and offset, the user terminal sets the DMTC period to Rel. 12 may be assumed to be 6 [ms].
- the user terminal may assume that PDCCH / EPDCCH (Physical Downlink Control Channel / Enhanced PDCCH) is not transmitted in each unlicensed frequency within the DMTC period. That is, the user terminal does not perform the PDCCH / EPDCCH detection operation in each unlicensed frequency within the DMTC period.
- PDCCH / EPDCCH Physical Downlink Control Channel / Enhanced PDCCH
- the user terminal may assume that DRS is transmitted on each unlicensed frequency within the DMTC period. That is, the user terminal performs DRS reception operation at each unlicensed frequency within the DMTC period.
- DRS is based on Rel. 12 DRS or a part of the reference signal, Rel. 12 DRS or a part of the reference signal and additional reference signal or system information data, or a new signal configuration RRM measurement signal with a length of 1 [ms] or less. It may be a combination.
- the user terminal assumes DRS transmission within the DMTC period, and does not assume data transmission ((E) PDCCH).
- a plurality of DRS transmission candidate positions are provided.
- the user terminal may assume that the DRS is transmitted simultaneously with the timing of the CCA between the synchronized cells (see the second and third DMTC periods in FIG. 4).
- the DRS transmission within the DMTC period may be performed at any one of several candidate positions after performing LBT based on the FBE mechanism.
- Each subframe includes an idle (no transmission) time including a CCA period for DRS transmission.
- a position other than the idle time is a DRS transmission candidate position.
- FIG. 5B and FIG. 5C show DRS design examples.
- the DRS shown in FIG. 12 Consists of broadcast information multiplexed on DRS and unused symbols.
- the DRS shown in FIG. 12 Consists of DRS and additional reference signals multiplexed on unused symbols.
- the user terminal may assume a plurality of time timings at which the DRS can be transmitted.
- the user terminal performs a detection operation assuming that PSS / SSS is present not only in specific subframes (eg, subframes of subframe numbers # 0 and # 5) in the DMTC period but also in other subframes. Also good.
- the user terminal may assume that multiple cell DRSs are transmitted synchronously.
- the user terminal may use the detected PSS / SSS timing for detection of a cell other than the cell corresponding to the physical cell ID of the PSS / SSS. Therefore, even if PSS / SSS in the DRS of a plurality of cells collide between cells, RRM measurement can be performed on cells that are simultaneously transmitted at the detected timing.
- the network may notify the user terminal of the physical cell ID list of the connected PCell and the LAA cell capable of carrier aggregation as a cell list.
- the user terminal may attempt cell detection at the detected PSS / SSS timing for all the notified physical cell IDs. Thereby, the load at the time of performing the RRM measurement about candidate cell ID with respect to each PSS / SSS timing from which the user terminal was detected can be reduced.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- the user terminal may perform blind detection of the serving LAA SCell signal for sections other than the DMTC period, and confirm whether downlink transmission is performed in the serving LAA SCell.
- the target signal for performing blind detection may be CRS (Cell-specific Reference Signal), DMRS (Demodulation Reference Signal), PDCCH, EPDCCH, a new reference signal, or a new L1 control signal. It may be a part of the signal or a combination of a plurality of signals.
- the user terminal may not assume PBCH (Physical Broadcast Channel) transmission from the serving LAA SCell for sections other than the DMTC period. That is, the user terminal does not perform the PBCH demodulation operation from the serving LAA SCell for the section other than the DMTC period.
- the user terminal can assume that the PDSCH (Physical Downlink Shared Channel) is multiplexed for OFDM symbols # 0 to # 3 in slot # 1 of subframe number # 0 as well as other subframe slots. .
- PDSCH Physical Downlink Shared Channel
- the user terminal may assume that DRS is multiplexed when downlink transmission of the serving LAA SCell is performed with a specific subframe number in a section other than the DMTC period. In this case, the user terminal assumes that PSS / SSS or CSI-RS (Channel State Information Reference Signal) included in DRS is transmitted in the subframe in addition to CRS, and performs rate matching for PDSCH. . When reporting the RSRP / RSRQ measured in the subframe, the user terminal may report the measured timing (subframe) together.
- PSS / SSS or CSI-RS Channel State Information Reference Signal
- FIG. 6 is a diagram illustrating an example of DRS transmission outside the DMTC period.
- the network may multiplex the data and transmit the DRS.
- subframes in which DRS can be multiplexed may be limited.
- the DRS-multiplexable subframe timing may be notified to the user terminal by RRC (Radio Resource Control), or may be defined in the specification.
- the PSS / SSS is not searched from the beginning, so the burden on the user terminal can be reduced.
- FIG. 7 is a schematic configuration diagram showing an example of a radio communication system according to the present embodiment.
- this wireless communication system carrier aggregation and / or dual connectivity in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit are integrated can be applied.
- the wireless communication system has a wireless base station that can use an unlicensed band.
- the radio communication system 1 is in a cell formed by a plurality of radio base stations 10 (11 and 12) and each radio base station 10, and is configured to be able to communicate with each radio base station 10.
- Each of the radio base stations 10 is connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the radio base station 11 is composed of, for example, a macro base station having a relatively wide coverage, and forms a macro cell C1.
- the radio base station 12 is configured by a small base station having local coverage, and forms a small cell C2.
- the number of radio base stations 11 and 12 is not limited to the number shown in FIG.
- the macro cell C1 may be operated in the license band and the small cell C2 may be operated in the unlicensed band.
- a part of the small cell C2 may be operated in the unlicensed band, and the remaining small cells C2 may be operated in the license band.
- the radio base stations 11 and 12 are connected to each other via an inter-base station interface (for example, optical fiber, X2 interface).
- 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 carrier aggregation or dual connectivity. For example, assist information (for example, downlink signal configuration) regarding the radio base station 12 using the unlicensed band can be transmitted from the radio base station 11 using the license band to the user terminal 20. Further, when carrier aggregation is performed in the license band and the unlicensed band, one radio base station (for example, the radio base station 11) may be configured to control the schedule of the license band cell and the unlicensed band cell.
- assist information for example, downlink signal configuration
- the user terminal 20 may be connected to the radio base station 12 without being connected to the radio base station 11.
- the wireless base station 12 using the unlicensed band may be connected to the user terminal 20 in a stand-alone manner.
- the radio base station 12 controls the schedule of the unlicensed band cell.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, 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
- a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a downlink control channel (PDCCH: Physical Downlink Control Channel, EPDCCH: Enhanced PDCCH), broadcast A channel (PBCH: Physical Broadcast Channel) or the like is used.
- PDSCH Physical Downlink Shared Channel
- EPDCCH Physical Downlink Control Channel
- PBCH Physical Broadcast Channel
- DCI Downlink Control Information
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), or the like is used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data and higher layer control information are transmitted by PUSCH.
- FIG. 8 is an overall configuration diagram of the radio base station 10 according to the present embodiment.
- the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO (Multiple-input and Multiple-output) transmission, an amplifier unit 102, a transmission / reception unit (transmission unit and reception unit) 103, A baseband signal processing unit 104, a call processing unit 105, and an interface unit 106.
- MIMO Multiple-input and Multiple-output
- 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 interface unit 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ Hybrid Automatic Repeat Request
- IFFT inverse fast Fourier transform
- Each transmission / reception unit 103 converts the downlink signal output from the baseband signal processing unit 104 by precoding for each antenna to a radio frequency band.
- the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 101.
- the transmitter / receiver 103, a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention can be applied.
- the radio frequency signal received by each transmission / reception antenna 101 is amplified by the amplifier unit 102, frequency-converted by each transmission / reception unit 103, converted into a baseband signal, and input 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 interface unit 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 interface unit 106 transmits / receives a signal (backhaul signaling) to / from an adjacent radio base station via an inter-base station interface (for example, optical fiber, X2 interface). Alternatively, the interface unit 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- a signal backhaul signaling
- inter-base station interface for example, optical fiber, X2 interface
- FIG. 9 is a main functional configuration diagram of the baseband signal processing unit 104 included in the radio base station 10 according to the present embodiment.
- the baseband signal processing unit 104 included in the radio base station 10 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, and a reception signal processing unit 304. Has been.
- the control unit 301 controls scheduling of downlink user data transmitted on the PDSCH, downlink control information transmitted on both or either of the PDCCH and the extended PDCCH (EPDCCH), downlink reference signals, and the like. In addition, the control unit 301 also performs scheduling control (allocation control) of RA preambles transmitted on the PRACH, uplink data transmitted on the PUSCH, uplink control information transmitted on the PUCCH or PUSCH, and uplink reference signals. Information related to allocation control of uplink signals (uplink control signals, uplink user data) is notified to the user terminal 20 using downlink control signals (DCI).
- DCI downlink control signals
- the control unit 301 controls allocation of radio resources to the downlink signal and the uplink signal based on the instruction information from the higher station apparatus 30 and the feedback information from each user terminal 20. That is, the control unit 301 has a function as a scheduler. A controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention can be applied to the control unit 301.
- the transmission signal generation unit 302 generates a downlink signal based on an instruction from the control unit 301 and outputs it to the mapping unit 303. For example, based on an instruction from the control unit 301, the transmission signal generation unit 302 generates a downlink assignment that notifies downlink signal allocation information and an uplink grant that notifies uplink signal allocation information. Further, 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) 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.
- a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention can be applied.
- Received signal processing section 304 receives UL signals transmitted from user terminals (for example, acknowledgment signals (HARQ-ACK), data signals transmitted on PUSCH, random access preambles transmitted on PRACH, etc.). Processing (for example, demapping, demodulation, decoding, etc.) is performed. The processing result is output to the control unit 301.
- the received signal processing unit 304 may measure received power (for example, RSRP (Reference Signal Received Power)), received quality (RSRQ (Reference Signal Received Quality)), channel state, and the like using the received signal. The measurement result may be output to the control unit 301.
- a signal processor, a signal processing circuit, or a signal processing device, and a measuring device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present invention can be applied.
- FIG. 10 is an overall configuration diagram of the user terminal 20 according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit (transmission unit and reception unit) 203, a baseband signal processing unit 204, an application Unit 205.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202, frequency-converted by the transmission / reception unit 203, and converted into a baseband signal.
- the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 204.
- 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.
- the transmitter / receiver 203 may be a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical field according to the present invention.
- Uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control (HARQ) transmission processing, channel coding, precoding, discrete Fourier transform (DFT) processing, inverse fast Fourier transform (IFFT) processing, and the like, and performs transmission and reception units 203.
- HARQ retransmission control
- DFT discrete Fourier transform
- IFFT inverse fast Fourier transform
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
- the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 201.
- FIG. 11 is a main functional configuration diagram of the baseband signal processing unit 204 included in the user terminal 20.
- FIG. 11 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, and a reception signal processing unit 404. ing.
- the control unit 401 acquires, 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 generates an uplink control signal (for example, an acknowledgment signal (HARQ-ACK)) or an uplink data signal based on a downlink control signal, a result of determining whether retransmission control is required for the downlink data signal, or the like.
- HARQ-ACK acknowledgment signal
- the control unit 401 controls the transmission signal generation unit 402 and the mapping unit 403.
- the control unit 401 performs control so as to perform only a reception operation of a discovery reference signal (DRS) for RRM measurement without performing a downlink control channel detection operation at an unlicensed frequency within a DMTC period.
- DRS discovery reference signal
- the transmission signal generation unit 402 generates an uplink signal based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403. For example, the transmission signal generation unit 402 generates an uplink control signal such as a delivery confirmation signal (HARQ-ACK) or channel state information (CSI) based on an instruction from the control unit 401.
- 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 downlink control signal notified from the radio base station 10 includes an uplink grant.
- a signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention can be applied to the transmission signal generation unit 402.
- 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.
- a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention can be applied.
- Reception signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on downlink signals (for example, downlink control signals transmitted from radio base stations, downlink data signals transmitted by PDSCH, etc.). )I do.
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401.
- Reception signal processing section 404 outputs, for example, broadcast information, system information, paging information, RRC signaling, DCI, and the like to control section 401.
- the received signal processing unit 404 may measure received power (RSRP), received quality (RSRQ), channel state, and the like using the received signal.
- the measurement result may be output to the control unit 401.
- the received signal processing unit 404 can be applied to a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measuring circuit or a measuring device which are described based on common recognition in the technical field according to the present invention.
- the block diagram used in the description of the above embodiment shows functional unit blocks. These functional blocks (components) are realized by any combination of hardware and software.
- the means for realizing each functional block is not particularly limited. Each functional block may be realized by one physically coupled device, or may be realized by two or more devices physically connected to each other by wired or wireless connection.
- the radio base station 10 and the user terminal 20 are realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array). May be.
- the radio base station 10 and the user terminal 20 may be realized by a computer device including a processor (CPU), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. That is, a radio base station, a user terminal, and the like according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method according to the present invention.
- the computer-readable recording medium is a storage medium such as a flexible disk, a magneto-optical disk, a ROM, an EPROM, a CD-ROM, a RAM, and a hard disk.
- the program may be transmitted from the network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system.
- the processor reads programs, software modules, and data from the storage medium into the memory, and executes various processes according to these.
- the program may be a program that causes a computer to execute the operations described in the above embodiments.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.
- Software, instructions, etc. may be transmitted and received via a transmission medium.
- the software uses websites, servers, and / or wireline technologies such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technologies such as infrared, wireless and microwave. Or, when transmitted from other remote sources, these wired and wireless technologies are included within the definition of transmission media.
- the radio resource may be indicated by an index.
- Channels and symbols may be signals (signaling).
- the signal may be a message.
- a component carrier (CC) may be referred to as a carrier frequency, a cell, or the like.
- Notification of predetermined information is not limited to being performed explicitly, and may be performed implicitly.
- notification of information is not limited to the aspect or embodiment shown in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof.
- the RRC signaling may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the information, signals, etc. shown in this specification may be expressed using any of a variety of different technologies.
- data, instructions, commands, information, signals, bits, symbols or chips, etc. that may be referred to throughout this specification are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, photon fields or photons, or any combination thereof. May be represented by
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- CDMA2000 Code Division Multiple Access 2000
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra Wide Band)
- Bluetooth registered trademark
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- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
本実施の形態では、LBTが設定されない周波数キャリアをライセンスバンド、LBTが設定される周波数キャリアをアンライセンスバンドとして説明するが、これに限られない。すなわち、本実施の形態は、LBTが設定される周波数キャリアであれば、ライセンスバンドまたはアンライセンスバンドにかかわらず適用できる。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上述のDRS送信およびRRM測定を行う無線通信方法が適用される。
Claims (10)
- LBT(Listen Before Talk)が設定された第1の周波数キャリアにおける信号の送受信を制御する制御部と、送受信部と、を有し、
前記制御部が、DMTC(Discovery Measurement Timing Configuration)期間内では前記第1の周波数キャリアにおいて下り制御チャネルの検出動作を行わずに、RRM(Radio Resource Management)測定のためのディスカバリ参照信号の受信動作のみを行うよう制御することを特徴とするユーザ端末。 - 前記制御部が、前記DMTC期間内において前記ディスカバリ参照信号が送信される時間タイミングを複数仮定して、前記ディスカバリ参照信号の受信動作を制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部が、前記DMTC期間内において複数の前記ディスカバリ参照信号が同時送信されることを仮定して、前記ディスカバリ参照信号の受信動作を制御することを特徴とする請求項1に記載のユーザ端末。
- 前記送受信部が、接続候補となる前記第1の周波数キャリアにおけるセルの物理セルIDリストを無線基地局から受信し、
前記制御部が、前記ディスカバリ参照信号に含まれる同期信号のタイミングにおいて、前記リストにおける物理セルIDすべてについてのセル検出を試みるよう制御することを特徴とする請求項1に記載のユーザ端末。 - 前記制御部が、前記ディスカバリ参照信号に含まれる同期信号のタイミングにおいて、前記同期信号の物理セルIDに対応するセル以外についてのセル検出を試みるよう制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部が、前記検出したセルについて無線基地局に報告する際に、前記セルが検出された前記DMTC期間内のタイミングをあわせて報告するよう制御することを特徴とする請求項4または請求項5に記載のユーザ端末。
- 前記制御部が、前記DMTC期間外において、前記第1の周波数キャリアのサービングセルにおける信号のブラインド検出を行うよう制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部が、前記DMTC期間外において、前記第1の周波数キャリアのサービングセルからの物理ブロードキャストチャネルの復調動作を行わないよう制御することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部が、前記DMTC期間外において、特定のサブフレームタイミングで前記第1の周波数キャリアの下りリンク信号の送信が行われている場合に、前記下りリンク信号に前記ディスカバリ参照信号が多重されていると仮定して受信動作を行うよう制御することを特徴とする請求項1に記載のユーザ端末。
- LBT(Listen Before Talk)が設定された第1の周波数キャリアを用いて無線基地局と通信可能なユーザ端末の無線通信方法であって、
DMTC(Discovery Measurement Timing Configuration)期間内では前記第1の周波数キャリアにおいて下り制御チャネルの検出動作を行わずに、RRM(Radio Resource Management)測定のためのディスカバリ参照信号の受信動作のみを行うよう制御する工程を有することを特徴とする無線通信方法。
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EP16792770.6A EP3297354A4 (en) | 2015-05-14 | 2016-05-13 | User terminal and wireless communication method |
US15/573,229 US20180103386A1 (en) | 2015-05-14 | 2016-05-13 | User terminal and radio communication method |
JP2017517997A JPWO2016182046A1 (ja) | 2015-05-14 | 2016-05-13 | ユーザ端末および無線通信方法 |
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- 2016-05-13 EP EP16792770.6A patent/EP3297354A4/en not_active Withdrawn
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JP2020511052A (ja) * | 2017-02-16 | 2020-04-09 | エルジー エレクトロニクス インコーポレイティド | 非免許帯域を支援する無線通信システムにおいて基地局と端末の間の信号送受信方法及びそれを支援する装置 |
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JP7028883B2 (ja) | 2017-02-16 | 2022-03-02 | エルジー エレクトロニクス インコーポレイティド | 非免許帯域を支援する無線通信システムにおいて基地局と端末の間の信号送受信方法及びそれを支援する装置 |
CN109660315A (zh) * | 2017-10-10 | 2019-04-19 | 北京展讯高科通信技术有限公司 | 基于dmrs的pdcch盲检方法及装置、存储介质、用户设备 |
CN109660315B (zh) * | 2017-10-10 | 2021-08-17 | 北京紫光展锐通信技术有限公司 | 基于dmrs的pdcch盲检方法及装置、存储介质、用户设备 |
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US20180103386A1 (en) | 2018-04-12 |
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