WO2017164221A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
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- WO2017164221A1 WO2017164221A1 PCT/JP2017/011387 JP2017011387W WO2017164221A1 WO 2017164221 A1 WO2017164221 A1 WO 2017164221A1 JP 2017011387 W JP2017011387 W JP 2017011387W WO 2017164221 A1 WO2017164221 A1 WO 2017164221A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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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
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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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
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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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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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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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
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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
- LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
- LTE Long Term Evolution
- Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel. 13/14/15 and later
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC dual connectivity
- CG Cell Group
- CC cell
- Inter-eNB CA inter-base station CA
- LTE Rel. frequency division duplex (FDD) in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and downlink transmission and uplink transmission are in the same frequency band.
- Time Division Duplex (TDD) which is performed by switching over time, is introduced.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- M2M may be referred to as D2D (Device To Device), V2V (Vehicular To Vehicular), or the like depending on a device to communicate. Designing a new communication access method (New RAT (Radio Access Technology)) is being studied in order to satisfy the above-mentioned various communication requirements.
- New RAT Radio Access Technology
- a beam can be formed by controlling the amplitude and / or phase of a signal transmitted / received from each element. This processing is also called beam forming (BF) and can reduce radio wave propagation loss.
- BF beam forming
- the present invention has been made in view of the above points, and provides a user terminal, a radio base station, and a radio communication method capable of reducing the time required to form an appropriate beam in communication using beam forming.
- a radio base station capable of reducing the time required to form an appropriate beam in communication using beam forming.
- a user terminal includes: a transmission unit that forms different transmission beams with radio resources that are temporally orthogonal to each other and transmits a reference signal to the radio base station; and the radio base station has a predetermined period of time. And a control unit that controls formation of a transmission beam so that at least one of the reference signals is received by the reception beam formed in the set.
- FIGS. 1A and 1B are diagrams illustrating an example of conventional MIMO MIMO precoding.
- FIG. 2 is a diagram for explaining restrictions on beam forming of analog BF.
- 3A and 3B are conceptual explanatory diagrams of transmission beam scanning according to the beam forming RS.
- 4A and 4B are diagrams illustrating an example of a transmission pattern of the beam forming RS.
- FIG. 5 is a diagram illustrating another example of the transmission pattern of the beam forming RS.
- 6A and 6B are explanatory diagrams of problems and countermeasures when scanning the transmission beam of the UE.
- 7A and 7B are conceptual explanatory diagrams of received beam scanning according to the beam forming RS.
- 8A and 8B are diagrams illustrating an example of a transmission pattern of the beam forming RS.
- FIG. 9A and 9B are explanatory diagrams of problems and countermeasures in the case of scanning the reception beam of the BS.
- 10A and 10B are diagrams illustrating an example of suitable beam scanning of the UE and BS.
- FIG. 11 is a diagram illustrating an example of transmitting the beam forming RS in a predetermined subframe.
- 12A to 12C are diagrams illustrating an example of the transmission time length of the beam forming RS (UE transmission beam duration).
- FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- FIG. 14 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- FIG. 15 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
- FIG. 16 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- FIG. 17 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- FIG. 18 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.
- Digital BF can be classified into digital BF and analog BF.
- Digital BF is a method of performing precoding signal processing (for a digital signal) on baseband.
- parallel processing of inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) / digital-analog conversion (DAC: Digital to Analog Converter) / RF (Radio Frequency) is required for the number of antenna ports (RF chains). Become. On the other hand, as many beams as the number of RF chains can be formed at an arbitrary timing.
- Analog BF is a method using a phase shifter on RF. In this case, since only the phase of the RF signal is rotated, the configuration is easy and can be realized at low cost. However, there is a problem that a plurality of beams cannot be formed at the same time.
- FIG. 1 is a diagram illustrating an example of conventional MIMO MIMO precoding.
- FIG. 1A illustrates an example of a demodulation reference signal (DMRS: DeModulation Reference Signal) configuration for receiving a PDSCH.
- DMRS DeModulation Reference Signal
- two DMRSs are multiplexed in one resource element (RE) in the case of 1-4 layer communication, and four DMRSs in one RE in the case of 5-8 layer communication.
- RE resource element
- four DMRSs in one RE in the case of 5-8 layer communication.
- signals are arranged on the assumption that DMRSs mapped on different beams are multiplexed on the same RE.
- a radio base station also called eNB (evolved Node B), BS (Base Station), etc.
- eNB evolved Node B
- BS Base Station
- FIG. 2 is a diagram for explaining restrictions on beam forming of analog BF.
- analog BF only one beam can be formed at a time for each phase shifter. For this reason, when the BS has only one phase shifter, one beam is formed at each time as shown in FIG. Therefore, when the analog BF is used, it is necessary to switch or rotate the beam in time.
- a BF gain by large-scale MIMO can be suitably obtained as long as appropriate beam forming can be performed.
- the beam forming process is different between the analog BF and the digital BF, it is indispensable to introduce control for realizing appropriate beam forming in each BF.
- analog BF since analog BF has not been considered in conventional LTE, a method for efficiently determining an appropriate beam has not been established even in a 5G environment. Therefore, it may take a long time to form an appropriate beam and / or communication may be performed using an inappropriate beam.
- the present inventors have focused on analog BF, which has great restrictions on beam formation, and have conceived a beam control method suitable for analog BF.
- the control method can be applied to a digital BF as it is, and can be extended to an analog / digital hybrid BF.
- This specification proposes a method for appropriately forming a beam used for uplink communication (a reception beam by a BS and / or a transmission beam by a user equipment (UE)).
- a plurality of beams are different represents, for example, a case where at least one of the following (1) to (6) applied to a plurality of beams is different, but is not limited thereto.
- precoding weights may be different, and precoding schemes (for example, linear precoding and non-linear precoding) may be different.
- precoding schemes for example, linear precoding and non-linear precoding
- transmission power, phase rotation, the number of layers, and the like can also change.
- linear precoding follow zero-forcing (ZF) norm, normalized zero-forcing (R-ZF) norm, minimum mean square error (MMSE) norm, etc.
- Precoding is mentioned.
- non-linear precoding include precoding such as Dirty Paper Coding (DPC), Vector Perturbation (VP), and THP (Tomlinson Harashima Precoding). Note that applied precoding is not limited to these.
- RB # 1 to RB # 4 are used as BS reception beams (RB), and TB # is used as a UE reception beam (TB).
- RB # 1 to TB # 4 are used as BS reception beams (RB)
- TB # is used as a UE reception beam (TB).
- the present invention is not limited to this.
- the direction, length, number, and the like of the beams used are not limited to the examples described below.
- beam switching is performed without delay in the BS and UE, but the BS and / or UE assumes that a predetermined delay occurs in beam switching.
- Various processes may be performed.
- a reference signal (RS) for each beam is used to determine an appropriate beam.
- the reference signal may be referred to as a beam forming RS, a beam forming RS (BFRS), a beam specific RS, or the like.
- BFRS beam forming RS
- the RS for beam forming in the uplink is simply expressed as “RS for beam forming”.
- FIG. 3 is a conceptual explanatory diagram of transmission beam scanning according to the beam forming RS.
- FIG. 3A shows an example of each UE transmission beam corresponding to a plurality of beam forming RSs.
- FIG. 3B shows an example of the time resource of the beam forming RS corresponding to FIG. 3A.
- the UE applies different transmit beamforming to beamforming RSs at different times.
- FIG. 3 shows an example in which the UE sweeps (scans) the transmission beam from TB # 1 to TB # 4 while shifting the time.
- the BS measures reception quality using each beam forming RS.
- the reception quality to be measured is, for example, long-period reception quality (such as reference signal received power (RSRP)) or short-period reception quality (channel state information (CSI)).
- RSRP reference signal received power
- CSI channel state information
- the present invention is not limited to these.
- the BS can determine an appropriate beam for the UE based on the measured reception quality of each beam forming RS, and can use it for subsequent communication with the UE.
- BS is based on higher layer signaling (for example, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.)), physical layer signaling (for example, DCI), or a combination thereof.
- Information regarding beam forming RSs to be transmitted separately by the UE can be notified, for example, the number of RSs, transmission timing (reception timing), transmission period (measurement period), and transmission as information regarding the beam forming RS.
- Information on at least one of time length (RS transmission duration in each cycle) and radio resource may be notified (set) to the UE. It may be notified by a bitmap.
- the BS may notify the UE of information on the UE transmission beam determined from the measurement result of the beam forming RS by higher layer signaling, physical layer signaling, or a combination thereof.
- the information on the transmission beam may be a beam index (beam control number) for specifying the beam.
- the UE that has received the information can determine a transmission beam to be used for subsequent communication based on the information.
- FIG. 4 is a diagram illustrating an example of a transmission pattern of the beam forming RS.
- FIG. 4A shows an example in which each beam forming RS is transmitted in the same cycle (for example, 40 ms). By transmitting each RS with the same period, the opportunity for the BS to receive each beam can be equalized.
- FIG. 4 shows an example in which different beam forming RSs are continuously transmitted in time.
- the timing at which the UE transmits the beam forming RS can be made substantially the same, so the transmission of the beam forming RS can be completed in a short time, and the battery consumption of the UE can be saved. .
- the beam forming RSs may be transmitted dispersed in time (not shown).
- the period at which the BS measures any of the beam forming RSs can be shortened, it is easy to perform communication using any of the beams even when the UE is moving at high speed.
- the transmission timing and transmission cycle may be changed individually for each beam forming RS. For example, when the width of each beam is different, it is preferable that these can be changed individually.
- RSs corresponding to TBs # 1 and # 2 are transmitted in a first period (for example, 40 ms), and RSs corresponding to TBs # 3 and # 4 are transmitted in a second period (for example, 80 ms). An example is shown.
- FIG. 5 is a diagram illustrating another example of the transmission pattern of the beam forming RS.
- FIG. 5 shows that RSs corresponding to TBs # 1 and # 2 are simultaneously transmitted in a predetermined cycle (for example, 40 ms), and RSs corresponding to TBs # 3 and # 4 are simultaneously transmitted adjacent in time. An example is shown.
- a plurality of beam forming RSs can be transmitted simultaneously using different beams, and thus overhead can be reduced.
- FIG. 6 is an explanatory diagram of problems and countermeasures when scanning the transmission beam of the UE.
- FIG. 6A when both the transmission beam of the UE and the reception beam of the BS are simultaneously swept, it is conceivable that the transmission beam and the reception beam are always directed in different directions. In this case, the reception quality cannot be measured in the BS, and the transmission beam of the appropriate UE cannot be determined.
- the BS does not switch its reception beam while performing measurements on the beam forming RS. That is, the BS measures different transmission beam forming RSs with the same reception beam. The BS may perform measurement by switching to another reception beam in the next period.
- FIG. 7 is a conceptual explanatory diagram of received beam scanning according to the beam forming RS.
- FIG. 7A shows an example of a plurality of reception beams that are tried to be received for a predetermined beam forming RS from the UE.
- FIG. 7B shows an example of a time resource of the beam forming RS corresponding to FIG. 7A.
- the UE applies the same transmission beamforming to the beam forming RSs at different times in a predetermined period.
- FIG. 7 shows an example in which the BS sweeps the reception beam from RB # 1 to RB # 4 while shifting the time.
- the BS measures the reception quality using each beam forming RS.
- the BS determines an appropriate received beam based on the measured reception quality of each beam forming RS, and controls subsequent communication with the UE.
- FIG. 8 is a diagram illustrating an example of a transmission pattern of the beam forming RS.
- FIG. 8 is the same as the example of FIG. 4 except that the beam forming RS is fixed.
- FIG. 9 is an explanatory diagram of problems and countermeasures when scanning the reception beam of the BS. As shown in FIG. 9A, when both the UE transmit beam and the BS receive beam sweep simultaneously, there is a possibility that the appropriate UE transmit beam cannot be determined as described in FIG. 6A.
- the UE does not switch the transmission beam while the BS performs the measurement for the beam forming RS. That is, the BS performs measurement with different reception beams for the same transmission beam forming RS. In the next period, the UE may switch to another transmission beam and transmit the beam forming RS.
- ⁇ Suitable beam scanning of UE and BS> As described above, the transmission beam scanning of the UE and the reception beam scanning of the BS are separately examined. In view of these examination results, the present inventors have found a method for efficiently scanning both the UE transmission beam and the BS reception beam to determine an appropriate beam.
- the BS forms a single reception beam and performs measurement of the RS within a first period set in which the beam forming RS is transmitted by a plurality of different transmission beams.
- the UE switches and forms a plurality of different transmission beams within the first period set in which the BS forms a single reception beam, and transmits a beam forming RS in each.
- the measurement results for the first period set can be suitably used to determine the UE's transmit beam.
- the BS performs measurement of the RS by switching and forming a plurality of different reception beams within the second period set in which the beam forming RS is transmitted by a single transmission beam.
- the UE forms a single transmission beam within a second set of periods in which the BS switches and forms a plurality of different reception beams, and transmits a beam forming RS in each.
- the measurement results for the second set of periods can be suitably used to determine the BS receive beam.
- each period set may be composed of continuous time resources, or may be composed of discrete time resources.
- a period set may be referred to as a time resource set, a subframe set, a symbol set, and the like.
- FIG. 10 is a diagram illustrating an example of a suitable beam scan of the UE and BS.
- FIG. 10A shows an example in which the UE sweeps the beam and the BS fixes the beam for each transmission period of the beam forming RS.
- FIG. 10B shows an example in which the UE fixes the beam and the BS sweeps the beam for each transmission period of the beam forming RS.
- the UE transmits different beam forming RSs while switching the transmission beam.
- the BS measures different beam forming RSs with the same reception beam.
- the first period set corresponds to the transmission duration of the beam forming RS within each period (for example, the continuous time in which TB # 1-TB # 4 is formed in FIG. 10A), and the second period The set corresponds to a set of times when the same beam forming RS is transmitted in a plurality of cycles (for example, a plurality of times when TB # 1 is formed in FIG. 10A).
- the UE since the UE transmits different beam forming RSs (different transmission beams) within each period, the measurement results of these RSs are useful for determining the transmission beam of the UE.
- the BS since the BS measures the same beam forming RS using different received beams at the same timing within each period, the measurement results of these RSs are used to determine the received beam of the BS. Useful.
- the UE transmits the same transmission beam (the same beam forming RS) in a predetermined period of a certain transmission cycle.
- the BS measures the same beam forming RS while switching the reception beam.
- the first period set corresponds to a set of relatively the same time of each period (for example, a plurality of times when RB # 1 is formed in FIG. 10A) in a plurality of periods
- the second period The set corresponds to the transmission duration time of the beam forming RS within each cycle (for example, the continuous time during which RB # 1-RB # 4 is formed in FIG. 10A).
- the UE since the UE transmits different beam forming RSs (different transmission beams) at the same timing within each period, the measurement results of these RSs are useful for determining the transmission beam of the UE. is there. In addition, since the BS measures the same beam forming RS using different received beams within each period, the measurement results of these RSs are useful for determining the received beam of the BS.
- RSs different transmission beams
- the beam scanning of FIG. 10 can scan the UE and BS beams in a short time.
- the reception beam of the BS only needs to be determined and used by the BS, and there is no problem even if the UE does not know which reception beam the BS uses.
- the transmission beam of the UE it is necessary to notify the UE which beam is appropriate. For this reason, when measurement is performed with different reception beams for the same beam forming RS, there is no need to notify each appropriate transmission beam corresponding to a plurality of reception beams. It is sufficient to notify all or a part of the reception quality that is good, that is, information that identifies the transmission beam measured as having good reception quality.
- the BS may transmit beam information (all or a part) corresponding to the results measured by different beam forming RSs as information on the UE transmission beam.
- the information on the UE transmission beam to be fed back may be information on the transmission beam corresponding to the measurement result (reception quality) of any or a combination of the following: (1) The measurement result of the RS for beam forming Number of measurement results selected in order from the better one (for example, n), (2) Measurement result above a predetermined threshold, (3) Maximum measurement result.
- the number and the predetermined threshold for determining the feedback target may be set by RRC signaling, for example.
- FIG. 11 is a diagram illustrating an example of transmitting the beam forming RS in a predetermined subframe.
- the UE uses the downlink control information (DCI) included in an arbitrary downlink control channel (for example, PDCCH (Physical Downlink Control Channel)) for scheduling information of the beam forming RS (information regarding the beam forming RS).
- DCI downlink control information
- PDCCH Physical Downlink Control Channel
- the beam forming RS is transmitted using a radio resource specified by the DCI.
- the beam forming RS may be transmitted in the same subframe as that for receiving the DCI, or may be transmitted in a different subframe.
- the BS may be configured to perform all of transmission of DCI, measurement of the beam forming RS, and transmission of information on the transmission beam determined based on the measurement result in the same subframe.
- FIG. 12 is a diagram illustrating an example of the transmission time length of the beam forming RS (UE transmission beam duration).
- FIG. 12 shows an example of the time resource of the beam forming RS swept by the UE, as in FIG. 3B. 12A-12C have different horizontal scales.
- different beam forming RSs may be transmitted in a plurality of subframes.
- different beam forming RSs may be transmitted with a plurality of different symbols in the same subframe.
- a transmission time section of the same symbol in the same subframe may be divided into a plurality of parts, and different beam forming RSs may be transmitted in each divided period.
- the subframe (transmission time interval (TTI)) length is preferably a TTI (short TTI) shorter than the existing LTE subframe length, for example, 0.1-0.25 ms is used. May be.
- TTI transmission time interval
- the subframe length is not limited to this.
- the symbol period may be expressed in OFDM (Orthogonal Frequency Division Multiplexing) / SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol units, or the reciprocal of a predetermined bandwidth (ie, sampling length). It 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
- the unit time for the BS to form the reception beam may be a subframe, a symbol, or a part of the symbol, similarly to the transmission time length of the beam forming RS.
- the beam forming RS may be an RS for CSI measurement (for example, an uplink measurement reference signal (UL-SRS)) or an RS defined separately. .
- RS uplink measurement reference signal
- the UE transmits information corresponding to the number of analog beams that can be formed by itself (information that can specify the number of analog beams) to the network side (for example, BS) in advance as terminal capability information (UE capability).
- the capability information may be the number of analog beams, the desired number of repetitions of the beam forming RS that the BS transmits with a predetermined beam, the number of phase shifters provided, and the like.
- the BS determines the configuration of the beam forming RS for the UE, notifies the beam forming RS to be transmitted by the UE, and schedules the beam forming RS. To notify the UE of scheduling information.
- the BS may control the UE that has transmitted the capability information to perform beam scanning according to the above-described wireless communication method.
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- the UE has information corresponding to the number of downlink analog beams (reception beams) that can be formed by itself, and information corresponding to the number of uplink analog beams (transmission beams) that can be formed by itself. Each may be reported as separate capability information.
- the terminal BF that can be achieved by each of the upper and lower links can be grasped more accurately on the BS side, and the beam forming RS can be set appropriately.
- the BS after receiving and measuring the beam forming RS, the BS includes information on the transmission beam (which transmission beam was appropriate) in a part of DCI, and a downlink control channel (DL-CCH: Downlink Control).
- DL-CCH Downlink Control
- (Channel) may be included in a part of RRC information, transmitted via a downlink shared channel (DL-SCH), or MAC control element (MAC CE: Medium Access Control Control) (Element)).
- the UE may assume that the same beam control must be applied until the next beam change notification (information on the transmission beam) is received.
- the UE is related to the transmission beam in response to the start of handover, the start of random access procedure, the expiration of TAT (Time Alignment Timer) used for uplink timing synchronization, etc. Transmission may be performed using a beam other than the beam specified by the information (for example, a default beam, a beam having the smallest beam index value, or the like).
- wireless communication system Wireless communication system
- communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.
- FIG. 13 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. 13 includes a radio base station 11 that forms a macro cell C1 with 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. 14 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) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- the transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do.
- the transmission / reception antenna 101 can be configured by an array antenna, for example.
- the transmission / reception unit 103 may transmit information regarding the beam forming RS to be transmitted to the user terminal 20.
- the transmission / reception unit 103 receives the beam forming RS from the user terminal 20 using the reception beam. Further, the transmission / reception unit 103 may receive terminal capability information corresponding to the number of analog beams that can be formed from the user terminal 20.
- FIG. 15 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. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes 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. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.
- 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 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. To control.
- digital BF for example, precoding
- analog BF for example, phase rotation
- control unit 301 performs control to form a reception beam so that at least one beamforming RS transmitted by different transmission beams can be received within a predetermined period set with radio resources orthogonal in time. I do.
- control unit 301 may perform control so as to form a single reception beam within a first period set in which the beam forming RS is transmitted by different transmission beams by the user terminal 20.
- control unit 301 may perform control so that a plurality of different reception beams are switched and formed within the second period set in which the beam forming RS is transmitted by a single transmission beam by the user terminal 20.
- the control unit 301 may perform both of these controls.
- control unit 301 controls the predetermined user terminal 20 to generate and transmit information related to the beam forming RS to be transmitted, which is used for controlling the transmission beam and / or the reception beam forming. .
- the information related to the beam forming RS is generated such that at least one beam forming RS is received by the reception beam formed by the radio base station 10 within a predetermined period set.
- control unit 301 may include information used to form a single (same) transmission beam in the first period set in the information related to the beam forming RS.
- the control unit 301 may include information used to switch and form a plurality of different transmission beams in the second period set in the information related to the beam forming RS.
- control unit 301 may control transmission of a beam forming RS of a predetermined user terminal 20 based on terminal capability information corresponding to the number of analog beams that can be formed, acquired from the reception signal processing unit 304. Good.
- the control unit 301 determines a transmission beam to be used by the user terminal 20 from the measurement result corresponding to each reception beam acquired from the measurement unit 305, and transmits information specifying the determined transmission beam to the user terminal 20. You may control to do. In addition, the control unit 301 may determine a transmission beam and / or a reception beam for the user terminal 20 from the measurement result, and control to use for communication with the user terminal 20.
- 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 unit 305 performs measurement using the beam forming RS transmitted from the user terminal 20.
- 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, for example, receive power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)) or channel of the received signal. You may measure about a state etc.
- the measurement result may be output to the control unit 301.
- FIG. 16 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 further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do.
- the transmission / reception antenna 201 can be configured by, for example, an array antenna.
- the transmission / reception unit 203 may receive information on the beam forming RS to be transmitted from the radio base station 10.
- the transmission / reception unit 203 transmits the beam forming RS to the radio base station 10 using a transmission beam. Further, the transmission / reception unit 203 may transmit terminal capability information corresponding to the number of analog beams that can be formed to the radio base station 10.
- FIG. 17 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. Note that FIG. 17 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, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.
- 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 uses the digital BF (for example, precoding) by the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. To control.
- digital BF for example, precoding
- analog BF for example, phase rotation
- control unit 401 may perform control so as to form a transmission beam and / or a reception beam based on information regarding the beam forming RS to be transmitted, acquired from the reception signal processing unit 404.
- the control unit 401 controls the beam forming RSs to form different transmission beams and transmit them with radio resources that are temporally orthogonal based on information on the beam forming RSs.
- the control unit 401 controls the formation of the transmission beam so that at least one beam forming RS is received by the reception beam formed by the radio base station 10 within a predetermined period set.
- control unit 401 may control the radio base station 10 to transmit the beam forming RS using a plurality of different transmission beams within the first period set in which a single reception beam is formed. Good. Further, the control unit 401 may perform control so that the beam forming RS is transmitted by a single (same) transmission beam within the second period set. The control unit 401 may perform both of these controls.
- control unit 401 may perform control so that terminal capability information corresponding to the number of analog beams that can be formed is transmitted to the radio base station 10.
- 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 reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 may measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ, received SINR), 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. 18 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 such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- 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.
- the TTI may be a transmission time unit of a channel-encoded data packet (transport block), or may be a processing unit such as scheduling or link adaptation.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be changed in various ways.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- 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.
- system and “network” used in this specification are used interchangeably.
- the base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.
- RRH indoor small base station
- base station BS
- radio base station eNB
- cell e.g., a fixed station
- eNodeB eNodeB
- cell group e.g., a cell
- carrier femtocell
- component carrier e.g., a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- MS mobile station
- UE user equipment
- terminal may be used interchangeably.
- a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- NodeB NodeB
- eNodeB eNodeB
- access point transmission point
- reception point femtocell
- small cell small cell
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- 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.
- information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (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), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband) , IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate wireless Systems utilizing communication methods and / or extensions based on them It may be applied to the next generation system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
本発明の一実施形態では、適切なビームを決定するために、ビームごとの参照信号(RS:Reference Signal)を用いる。当該参照信号は、ビーム形成用RS、ビームフォーミングRS(BFRS)、ビーム固有RSなどと呼ばれてもよい。本明細書では、上りリンク通信用のビーム形成について説明するため、上りリンクのビーム形成用RSを、単に「ビーム形成用RS」と表す。
図3は、ビーム形成用RSに係る送信ビーム走査の概念説明図である。図3Aは、複数のビーム形成用RSに対応する各UE送信ビームの一例を示している。図3Bは、図3Aに対応するビーム形成用RSの時間リソースの一例を示している。図3では、UEは、異なる時間のビーム形成用RSに対して、異なる送信ビームフォーミングを適用する。
図7は、ビーム形成用RSに係る受信ビーム走査の概念説明図である。図7Aは、UEからの所定のビーム形成用RSに対して受信を試行する複数の受信ビームの一例を示している。図7Bは、図7Aに対応するビーム形成用RSの時間リソースの一例を示している。図7では、UEは、所定の期間において、異なる時間のビーム形成用RSに対して、同じ送信ビームフォーミングを適用する。
以上で、UEの送信ビーム走査と、BSの受信ビーム走査について別々に検討した。本発明者らは、これらの検討結果を鑑みて、UEの送信ビーム及びBSの受信ビームの両方を効率良く走査して適切なビームを決定する方法を見出した。
ビーム形成用RSが送信される時間リソースについて、図11及び12を用いて説明する。図11は、ビーム形成用RSを所定のサブフレームで送信する一例を示す図である。図11では、UEは、ビーム形成用RSのスケジューリング情報(ビーム形成用RSに関する情報)を、任意の下り制御チャネル(例えば、PDCCH(Physical Downlink Control Channel))に含まれる下り制御情報(DCI)で取得する。ビーム形成用RSは、当該DCIによって指定される無線リソースで送信される。例えば、ビーム形成用RSは、当該DCIを受信するサブフレームと同じサブフレームで送信されてもよいし、異なるサブフレームで送信されてもよい。
なお、ビーム形成用RSは、CSI測定用のRS(例えば、上りリンク測定用参照信号(UL-SRS:Uplink Sounding Reference Signal))であってもよいし、別途定義されるRSであってもよい。
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これらの組み合わせを用いて通信が行われる。
図14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16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 (9)
- 時間的に直交する無線リソースで、それぞれ異なる送信ビームを形成して、参照信号を無線基地局に送信する送信部と、
前記無線基地局が所定の期間セット内で形成する受信ビームにより前記参照信号が少なくとも1つ受信されるように、送信ビームの形成を制御する制御部と、を有することを特徴とするユーザ端末。 - 前記制御部は、前記無線基地局が単一の受信ビームを形成する第1の期間セット内で、複数の異なる送信ビームを切り替えて形成するように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。
- 前記制御部は、前記無線基地局が複数の異なる受信ビームを切り替えて形成する第2の期間セット内で、単一の送信ビームを形成するように制御することを特徴とする請求項1又は請求項2に記載のユーザ端末。
- 送信ビーム及び/又は受信ビームは、アナログビームフォーミングにより形成されることを特徴とする請求項1に記載のユーザ端末。
- 前記参照信号に基づいて受信品質が良いと測定された送信ビームを特定する情報を受信する受信部を有し、
前記制御部は、当該情報に基づいて送信ビームを形成することを特徴とする請求項1に記載のユーザ端末。 - 前記送信部は、前記参照信号を、下り制御情報でスケジューリングされる無線リソースで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。
- 形成し得るアナログビームの個数に相当する端末能力情報を送信する送信部を有し、
当該端末能力情報は、送信ビーム及び/又は受信ビームを制御するために用いられることを特徴とする請求項1に記載のユーザ端末。 - 時間的に直交する無線リソースで、それぞれ異なる送信ビームにより送信される参照信号を、受信ビームを形成して受信する受信部と、
前記参照信号に基づいて測定を実施する測定部と、
所定の期間セット内で前記参照信号を少なくとも1つ受信するように、受信ビームの形成を制御する制御部と、を有することを特徴とする無線基地局。 - 時間的に直交する無線リソースで、それぞれ異なる送信ビームを形成して、参照信号を無線基地局に送信する工程と、
前記無線基地局が所定の期間セット内で形成する受信ビームにより前記参照信号が少なくとも1つ受信されるように、送信ビームの形成を制御する工程と、を有することを特徴とする無線通信方法。
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