WO2018030540A1 - ユーザ端末、基地局装置及び無線通信方法 - Google Patents
ユーザ端末、基地局装置及び無線通信方法 Download PDFInfo
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- WO2018030540A1 WO2018030540A1 PCT/JP2017/029220 JP2017029220W WO2018030540A1 WO 2018030540 A1 WO2018030540 A1 WO 2018030540A1 JP 2017029220 W JP2017029220 W JP 2017029220W WO 2018030540 A1 WO2018030540 A1 WO 2018030540A1
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—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
- 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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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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
- H04B7/0686—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
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—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
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a user terminal, a base station apparatus, and a wireless communication method. More specifically, the present invention relates to a user terminal, a base station apparatus, and a radio communication method to which a beam selection method and a beam determination method can be applied in a radio communication system.
- FD-MIMO Full Dimensional MIMO
- massive MIMO massive MIMO
- LTE Long Term Evolution
- LTE-Advanced Pro LTE-Advanced Pro
- each beam is measured by the mobile station, and the measurement result of CSI-RS included in each beam is fed back from the mobile station to the base station.
- the base station selects a subsequent beam to be transmitted to the mobile station from the plurality of candidate beams according to the feedback.
- the base station transmits channel state reference signals (CSI-RS) for a plurality of candidate beams statically or semi-statically by RRC signaling. Send to.
- CSI-RS channel state reference signals
- the present invention has been made in view of the above points, and provides a user terminal, a base station apparatus, and a wireless communication method capable of suppressing signaling overhead used for beam measurement and reducing the complexity of beam measurement and calculation. Is one of the purposes.
- One aspect of the present invention is a user terminal that reports channel state information to a base station apparatus, and receives each base beam reference signal included in one or more base beams transmitted from the base station.
- a determining unit for determining a suitable basic beam and an auxiliary beam to be combined with the preferred basic beam based on the received basic beam reference signal, and combination information regarding a combination of the preferable basic beam and the auxiliary beam.
- a transmission unit for transmitting to the base station apparatus.
- Another aspect of the present invention is a receiver that receives combination information related to a combination of a suitable basic beam and an auxiliary beam transmitted from a user terminal, and combines the preferred basic beam and the auxiliary beam according to the received combination information.
- a beam determining unit that determines a transmission beam for the user terminal.
- the present invention it is possible to provide a user terminal, a base station apparatus, and a wireless communication method capable of suppressing signaling overhead used for beam measurement and reducing the complexity of beam measurement and calculation.
- FIG. 3 is a schematic diagram illustrating determining a preferred base beam and an auxiliary beam to be combined with the preferred base beam according to one embodiment of the present invention.
- 6 is a flowchart illustrating a beam determination method executed by a base station according to an example of the present invention. 6 is a flowchart illustrating a beam combining method performed by a base station according to an example of the present invention.
- 1 is an exemplary block diagram illustrating a mobile station according to an embodiment of the present invention.
- 1 is an exemplary block diagram illustrating a base station according to an embodiment of the present invention.
- FIG. 3 is an exemplary block diagram illustrating a transmission beam determination unit according to one example of the present invention.
- the UE described herein includes various types of user terminals, such as mobile terminals (or mobile stations) or fixed terminals. However, for convenience, in the following, UE and mobile station may be used interchangeably in some cases. Also good.
- the base station includes various types of base station apparatuses such as gNB and transmission points.
- FIG. 1 is a flowchart showing a beam selection method applied to a mobile station according to one embodiment of the present invention.
- a basic beam reference signal transmitted from a base station is received.
- the base station generates multiple groups of beams, and each group of beams may include multiple base beams.
- a base beam reference signal for each base beam in a group of beams is received.
- a new codebook is created for the base beam that can be generated by the base station.
- the base beam that can be generated by the base station may be a beam corresponding to an existing codebook (for example, a codebook in 3GPP standard Release 13), thereby ensuring good compatibility with the existing codebook. Is done.
- step S102 according to the basic beam reference signal, a suitable basic beam and whether or not it is necessary to perform beam combination are determined. For example, the channel state of each fundamental beam is measured according to the fundamental beam reference signal, and the fundamental beam having the best channel state is selected as the preferred fundamental beam among the plurality of fundamental beams corresponding to the fundamental beam reference signal according to the measurement result. select.
- step S102 it is further determined whether or not it is necessary to perform a beam combination of a suitable basic beam and another beam according to the measurement result. For example, if the measurement result of the preferred basic beam indicates that the channel state of the beam satisfies a predetermined channel state threshold, it is determined in step S102 that it is not necessary to perform beam combination. On the other hand, if the measurement result of the preferred basic beam indicates that the channel state of the beam does not reach the predetermined channel state threshold, it is determined in step S102 that it is necessary to perform beam combination, and the beam combination is determined. To obtain a beam with a better channel condition.
- step S103 basic beam information related to the preferred basic beam and combination information related to the beam combination are transmitted to the base station.
- the basic beam information of the preferred basic beam is the beam index of the preferred basic beam.
- step S103 basic beam information regarding a suitable basic beam and combination information regarding the fact that it is not necessary to perform beam combination are set as bases. Send to the station. Further, for example, when it is determined in step S102 that it is necessary to perform beam combination, in step S103, basic beam information regarding a suitable basic beam and combination information regarding the necessity of performing beam combination are obtained. Send to base station.
- the method shown in FIG. 1 further comprises an auxiliary beam combined with a preferred base beam and an auxiliary beam combination factor. Including.
- the base station can generate a plurality of groups of beams.
- the auxiliary beam to be determined may be another base beam in the same beam group as the preferred base beam.
- the determined auxiliary beam and the preferred base beam may be in different beam groups, i.e. the auxiliary beam may be a base beam in another beam group.
- FIG. 2 is a schematic diagram illustrating the determination of the preferred basic beam and the auxiliary beam combined with the preferred basic beam according to one embodiment of the present invention.
- the mobile station receives a base beam reference signal of a group of base beams (ie, base beams 210-240) transmitted from the base station.
- step S102 in the example shown in FIG. 2, it is determined that the preferred basic beam is the basic beam 220 and that beam combination is necessary.
- the mobile station further determines to perform beam combination using the beam 240 in the same beam group as the basic beam 220.
- the combination coefficient of the auxiliary beam may be a coefficient for adjusting the auxiliary beam when combining with the suitable basic beam.
- the coefficient for adjusting the auxiliary beam includes an amplitude coefficient and a phase coefficient in order to adjust the amplitude and phase of the auxiliary beam.
- the beam B 0 to be obtained is determined by combining the suitable basic beam b 0 and the auxiliary beam b i according to the following formula (1).
- x i represents an amplitude coefficient
- ⁇ i represents a phase coefficient
- the combination information about the beam combination includes information about the auxiliary beam and its combination coefficient.
- the combination information includes auxiliary beam information regarding the auxiliary beam combined with the preferred basic beam and coefficient information regarding the combination coefficient of the auxiliary beam.
- the auxiliary beam information for the auxiliary beam may be the beam index of the auxiliary beam.
- the coefficient information includes amplitude information and phase information.
- the amplitude information indicates the amplitude coefficient
- the phase information indicates the phase coefficient.
- the amplitude information may be used to indicate whether it is necessary to perform beam combination, that is, in order to indicate whether it is necessary to perform beam combination, It is not necessary to provide another identifier different from the amplitude information. Specifically, amplitude information is set to zero when it is determined that it is not necessary to perform beam combination. If it is not necessary to perform beam combination, it is not necessary to notify the base station of the auxiliary beam and the parameters for adjusting the auxiliary beam. In step S103, the mobile station By transmitting the amplitude information to the base station, the base station is notified that the preferred base beam selected by the mobile station and that the preferred base beam does not require beam combination.
- the mobile station may not transmit information other than the amplitude information (for example, auxiliary beam information and phase coefficient) in the combination information to the base station.
- the mobile station transmits basic beam information, auxiliary beam information, amplitude information, and phase information regarding a suitable basic beam to the base station.
- amplitude information and information other than the amplitude information in the combination information may be transmitted.
- amplitude information is first transmitted, and then information other than amplitude is transmitted from the combination information. Therefore, the base station determines whether or not information other than the amplitude information among the combination information can be received according to the amplitude information.
- information other than the amplitude information in the combination information may be divided into a plurality of times and transmitted to the base station. For example, first, auxiliary beam information may be transmitted, and then phase information may be transmitted again.
- the combination information includes combination instruction information indicating whether or not it is necessary to perform beam combination, auxiliary beam information regarding an auxiliary beam to be combined with a suitable basic beam, and auxiliary beam. And coefficient information related to the combination coefficient. If it is not necessary to perform beam combination, it is not necessary to notify the base station of the auxiliary beam and the parameters for adjusting the auxiliary beam.
- the mobile station By transmitting the combination instruction information to the base station, the base station is notified that the preferred basic beam selected by the mobile station and that the preferred basic beam does not need to be combined. The mobile station may not send the combination information to the base station.
- the mobile station transmits basic beam information and combination instruction information regarding a suitable basic beam to the base station, and auxiliary beam information and coefficient information (for example, amplitude and phase information) Are further transmitted to the base station.
- combination instruction information and information other than the combination instruction information in the combination information may be transmitted in step S103.
- the combination instruction information is first transmitted, and then information other than the combination instruction information is transmitted among the combination information. Therefore, the base station determines whether information other than the combination instruction information can be received in the combination information according to the combination instruction information.
- information other than the combination instruction information in the combination information may be divided into a plurality of times and transmitted to the base station. For example, first, auxiliary beam information and amplitude information are transmitted, and then phase information is transmitted.
- the combination information is based on the physical uplink control channel (PUCCH: Physical Uplink Control Channel) and / or the physical uplink shared channel (PUSCH: Physical Uplink Shared Channel). Send to the station.
- the combination information may be transmitted to the base station periodically or aperiodically as necessary.
- the entire combination information is transmitted to the base station by PUCCH.
- the combination information may be transmitted by PUCCH using a precoding matrix index (PMI: Precoding Matrix Indicator).
- PMI Precoding Matrix Indicator
- the combination information includes part or all of information in information such as combination instruction information, auxiliary beam information, amplitude information, and phase information.
- the entire combination information may be transmitted using one PMI, or the entire combination information may be transmitted using a plurality of PMIs.
- combination instruction information and / or auxiliary beam information in the combination information is transmitted using the first PMI, and other information in the combination information is transmitted using the second PMI.
- the entire combination information may be transmitted to the base station using PUSCH.
- some information in the combination information may be transmitted to the base station by PUCCH, and the other information in the combination information may be transmitted to the base station by PUSCH.
- some information in the combination information may be transmitted by PUCCH, and the remaining partial information in the combination information may be transmitted to the base station by PUSCH.
- the combination information includes part or all of the information such as combination instruction information, auxiliary beam information, amplitude information, and phase information
- the combination instruction information and / or auxiliary beam in the combination information by PUCCH Information is transmitted, and other information in the combination information is transmitted by PUSCH.
- the base station In order to avoid collision between a beam for one mobile station and a beam for another mobile station, the base station notifies the mobile station of the beam whose use is restricted by transmitting beam restriction information to the mobile station. May be.
- the method shown in FIG. 1 receives the beam limit information transmitted from the base station, where the beam limit information indicates the beam whose use is limited, and then the auxiliary beam determined in step S102. And obtaining a correlation coefficient between the beam and the limited beam indicated by the beam limitation information.
- the correlation coefficient R (k) is acquired by the following equation (2).
- b k represents a beam whose use is restricted.
- step S103 the basic beam information regarding the preferable basic beam and the combination information instructing not to perform the beam combination are transmitted to the base station.
- the auxiliary beam to be combined with the preferred base beam is re-established, and the combination coefficient of the auxiliary beam to be re-established is re-established.
- step S103 basic beam information relating to the preferred basic beam, auxiliary beam information relating to the reselected auxiliary beam, and coefficient information relating to the combination coefficient of the reselected auxiliary beam are transmitted to the base station.
- a suitable basic beam is determined in accordance with a basic beam reference signal, and then it is determined whether or not it is necessary to combine the preferable basic beam with another beam.
- the result can be fed back to the base station. Therefore, even in a Massive MIMO system with a larger number of antennas, a beam that can be used when a base station subsequently communicates with the mobile station without increasing the signaling overhead for beam measurement as the number of antennas increases. Can be obtained accurately.
- the basic beam is a beam corresponding to an existing code book, good compatibility with the existing code book is ensured.
- a plurality of suitable basic beams may be determined in step S102. In this case, it is determined whether or not it is necessary to perform beam combination for each preferable basic beam, and when it is necessary to perform beam combination, an auxiliary beam combined with the preferable basic beam, A combination coefficient may be determined.
- FIG. 3 is a flowchart illustrating a beam determination method 300 performed by a base station according to an example of the present invention.
- step S301 basic beam information and combination information transmitted from a mobile station are received.
- the basic beam information and the combination information are generated by the mobile station according to the basic beam reference signal transmitted from the base station.
- the basic beam information and the combination information have already been described in detail with reference to FIGS. 1 and 2, and thus the description thereof is omitted here.
- step S302 a suitable basic beam is acquired according to the basic beam information, and it is determined in step S303 whether it is necessary to perform beam combination according to the combination information. Then, in step S304, if it is not necessary to perform beam combination, the preferred base beam is determined as the transmission beam for the mobile station. In the subsequent data transmission process, the preferred base beam is used to transmit data to the mobile station.
- FIG. 4 is a flowchart illustrating a beam combining method 400 performed by a base station according to one example of the present invention.
- a beam combining method 400 performed by a base station according to one example of the present invention.
- an auxiliary beam and an auxiliary beam combination coefficient are acquired according to the combination information.
- a transmission beam for the mobile station is obtained according to the combination coefficient of the preferred basic beam, the auxiliary beam, and the auxiliary beam.
- the combination coefficient may include an amplitude coefficient and a phase coefficient.
- the transmission beam is obtained by combining the suitable basic beam and the auxiliary beam according to the above formula (1).
- the mobile station first transmits information indicating whether it is necessary to perform beam combination among the combination information, and performs beam combination when it is necessary to perform beam combination. After transmitting the information indicating whether or not it is necessary, the remaining information in the combination information may be transmitted. Accordingly, in step S301, the base station first receives information indicating whether it is necessary to perform beam combination. When it is determined in step S303 that it is not necessary to perform beam combination, the base station determines that it is not necessary to receive the remaining information in the combination information, and performs beam combination according to the remaining information in the combination information. Confirm that it is not necessary to do. On the other hand, when it is determined in step S303 that it is necessary to perform beam combination, the base station determines that it is necessary to receive the remaining information in the combination information, and the remaining information in the combination information. To determine that it is necessary to perform beam combination.
- use of the method shown in FIG. 3 is limited by transmitting beam restriction information to the mobile station before receiving basic beam information and combination information transmitted from the mobile station. It may further include notifying the beam. Further, the mobile station generates basic beam information and combination information according to the beam restriction information, thereby avoiding collision between the beam for the mobile station and the beam for another mobile station.
- the beam determination method determines whether or not it is necessary to perform a suitable basic beam and beam combination by receiving basic beam information and combination information generated by the mobile station according to the basic beam reference signal. A heel is determined and a transmission beam for the mobile station is further determined. Therefore, even in a Massive MIMO system with a larger number of antennas, a beam that can be used when a base station subsequently communicates with the mobile station without increasing the signaling overhead for beam measurement as the number of antennas increases. Can be obtained accurately.
- the basic beam is a beam corresponding to an existing code book, good compatibility with the existing code book is ensured.
- FIG. 5 is an exemplary block diagram illustrating a mobile station 500 according to an embodiment of the present invention.
- the mobile station 500 includes a reception unit 510, a determination unit 520 and a transmission unit 530.
- the mobile station 500 may further include other components.
- these components are not related to the contents of the embodiment of the present invention, illustration and description thereof are omitted here. .
- the specific details of the following operations executed by the mobile station 500 according to the embodiment of the present invention are the same as the details described with reference to FIGS. Therefore, the duplicate description of the same details is omitted.
- the receiving unit 510 receives the basic beam reference signal transmitted from the base station.
- the base station generates multiple groups of beams, and each group of beams can include multiple base beams.
- the receiving unit 510 may receive a base beam reference signal for each base beam in a group of beams.
- a new codebook of basic beams that can be generated by the base station may be created.
- the base beam that can be generated by the base station may be a beam corresponding to an existing code book (for example, a code book in 3GPP standard Release 13), thereby ensuring good compatibility with the existing code book.
- an existing code book for example, a code book in 3GPP standard Release 13
- the confirmation unit 520 determines a suitable basic beam and whether or not beam combination is necessary according to the basic beam reference signal. For example, measure the channel condition of each fundamental beam according to the fundamental beam reference signal, and select the fundamental beam with the best channel condition as the preferred fundamental beam among multiple fundamental beams corresponding to the fundamental beam reference signal according to the measurement result. To do.
- the determination unit 520 determines whether or not it is necessary to perform a beam combination of a suitable basic beam and another beam according to the measurement result. For example, if the measurement result of the preferred base beam indicates that the channel state of the beam meets a predetermined channel state threshold, the determination unit 520 determines that no beam combination is necessary. On the other hand, if the measurement result of the preferred basic beam indicates that the channel state of the beam does not reach the predetermined channel state threshold, the determination unit 520 determines that it is necessary to perform the beam combination, and the beam combination To obtain a beam with a better channel condition.
- the transmission unit 530 transmits the basic beam information regarding the preferred basic beam and the combination information regarding the beam combination to the base station.
- the basic beam information of the preferred basic beam is the beam index of the preferred basic beam.
- the transmission unit 530 bases the basic beam information on the preferred basic beam and the combination information on the fact that it is not necessary to perform beam combination. Send to the station. Also, for example, when it is determined by the determination unit 520 that it is necessary to perform beam combination, the transmission unit 530 includes basic beam information regarding a suitable basic beam and combination information regarding the necessity of performing beam combination. Send to base station.
- the determination unit 520 when it is determined that it is necessary to perform beam combination, the determination unit 520 further determines an auxiliary beam to be combined with a suitable basic beam and an auxiliary beam combination coefficient.
- the base station can generate a plurality of groups of beams.
- the auxiliary beam determined by the determination unit 520 may be another base beam in the same beam group as the preferred base beam.
- the auxiliary beam and the preferred base beam determined by the determination unit 520 may be in different beam groups, i.e. the auxiliary beam may be a base beam in another beam group.
- the combination coefficient of the auxiliary beam is a coefficient for adjusting the auxiliary beam when combining with the suitable basic beam.
- the coefficient for adjusting the auxiliary beam includes an amplitude coefficient and a phase coefficient in order to adjust the amplitude and phase of the auxiliary beam.
- the beam obtained by combining the suitable basic beam and the auxiliary beam by the above formula (1) is determined as the transmission beam.
- the combination information on the beam combination includes the mutual information of the auxiliary beam and its combination coefficient.
- the combination information includes auxiliary beam information regarding the auxiliary beam combined with the preferred basic beam and coefficient information regarding the combination coefficient of the auxiliary beam.
- the auxiliary beam information for the auxiliary beam may be the beam index of the auxiliary beam.
- the coefficient information includes amplitude information and phase information.
- the amplitude information indicates the amplitude coefficient
- the phase information indicates the phase coefficient.
- the combination information is different from amplitude information. It is not necessary to provide one identifier. Specifically, amplitude information is set to zero when it is determined that it is not necessary to perform beam combination. If it is not necessary to perform beam combining, it is not necessary to notify the base station of the auxiliary beam and the parameters for adjusting the auxiliary beam. Is transmitted to the base station to notify the base station that the preferred basic beam selected by the mobile station and that the preferred basic beam does not require beam combination.
- the mobile station may not transmit information other than the amplitude information (for example, auxiliary beam information and phase coefficient) in the combination information to the base station.
- the transmission unit 530 transmits basic beam information, auxiliary beam information, amplitude information, and phase information regarding the preferred basic beam to the base station.
- the transmission unit 530 may transmit amplitude information and information other than the amplitude information among the combination information. For example, amplitude information is first transmitted, and then information other than amplitude is transmitted from the combination information. Therefore, the base station determines whether or not information other than the amplitude information among the combination information can be received according to the amplitude information. Note that information other than the amplitude information in the combination information may be divided into a plurality of times and transmitted to the base station. For example, first, auxiliary beam information may be transmitted, and then phase information may be transmitted again.
- the combination information includes combination instruction information indicating whether or not it is necessary to perform beam combination, auxiliary beam information regarding an auxiliary beam to be combined with a suitable basic beam, and auxiliary beam. And coefficient information related to the combination coefficient.
- the transmission unit 530 transmits the basic beam information regarding the preferred basic beam and the combination instruction. By transmitting information to the base station, the base station is notified that the preferred base beam selected by the mobile station and that the preferred base beam does not need to be combined. The mobile station may not send the combination information to the base station.
- the mobile station transmits basic beam information and combination instruction information regarding a suitable basic beam to the base station, and auxiliary beam information and coefficient information (for example, amplitude information and phase information). Are further transmitted to the base station.
- the transmission unit 530 may transmit the matching instruction information and information other than the combination instruction information in the combination information.
- the combination instruction information is first transmitted, and then information other than the combination instruction information is transmitted among the combination information. Therefore, the base station determines whether information other than the combination instruction information can be received in the combination information according to the combination instruction information.
- information other than the combination instruction information in the combination information may be divided into a plurality of times and transmitted to the base station. For example, first, auxiliary beam information and amplitude information are transmitted, and then phase information is transmitted again.
- the transmission unit 530 transmits the combination information to the base station using the PUCCH and / or PUSCH. Note that the combination information may be transmitted to the base station periodically or aperiodically as necessary.
- the entire combination information may be transmitted to the base station by PUCCH.
- combination information is transmitted by PUCCH using PMI.
- the combination information includes part or all of information in information such as combination instruction information, auxiliary beam information, amplitude information, and phase information.
- the entire combination information may be transmitted using one PMI, or the entire combination information may be transmitted using a plurality of PMIs.
- the combination instruction information and / or auxiliary beam information in the combination information is transmitted using the first PMI, and other information in the combination information is transmitted using the second PMI.
- the entire combination information may be transmitted to the base station using PUSCH.
- some information in the combination information may be transmitted to the base station by PUCCH, and the other information in the combination information may be transmitted to the base station by PUSCH.
- some information in the combination information may be transmitted by PUCCH, and another information in the combination information may be transmitted to the base station by PUSCH.
- the combination information includes part or all of the information such as combination instruction information, auxiliary beam information, amplitude information, and phase information, the combination instruction information and / or auxiliary beam information in the combination information by PUCCH And other information in the combination information is transmitted by PUSCH.
- the base station In order to avoid collision between a beam for one mobile station and a beam for another mobile station, the base station notifies the mobile station of the beam whose use is restricted by transmitting beam restriction information to the mobile station. May be.
- the receiving unit 530 further receives beam restriction information transmitted from the base station, where the beam restriction information indicates a beam whose use is restricted.
- the mobile station may further include a correlation coefficient acquisition unit to acquire a correlation coefficient between the determined auxiliary beam and the limited beam indicated by the beam limitation information. For example, the correlation coefficient is acquired by the above equation (2).
- the transmission unit 530 transmits the basic beam information regarding the preferred basic beam and the combination information instructing not to perform the beam combination to the base station. To do.
- the determination unit 520 re-establishes the auxiliary beam to be combined with the preferred base beam and re-establishes the re-established auxiliary beam combination coefficient.
- the transmission unit 530 transmits basic beam information regarding the preferred basic beam, auxiliary beam information regarding the reselected auxiliary beam, and coefficient information regarding the combination coefficient of the reselected auxiliary beam to the base station.
- a suitable basic beam is determined according to the basic beam reference signal, and then it is determined whether or not it is necessary to combine the preferable basic beam with another beam. Can be fed back to the base station. Therefore, even in a Massive MIMO system with a larger number of antennas, a beam that can be used when a base station subsequently communicates with the mobile station without increasing the signaling overhead for beam measurement as the number of antennas increases. Can be obtained accurately.
- the basic beam is a beam corresponding to an existing code book, good compatibility with the existing code book is ensured.
- the determination unit 520 may determine a plurality of suitable basic beams. In this case, it is determined whether it is necessary to perform beam combination for each preferable basic beam, and when it is necessary to perform beam combination, an auxiliary beam combined with the preferable basic beam, Determine the combination coefficient.
- FIG. 6 is an exemplary block diagram illustrating a base station 600 according to an embodiment of the present invention.
- the base station 600 includes a reception unit 610, a basic beam acquisition unit 620, a combination determination unit 630, and a transmission beam determination unit 640.
- the base station 600 may further include other components. However, these components are not related to the contents of the embodiment of the present invention, and thus illustration and description thereof are omitted here. . Note that the specific details of the following operations executed by the base station 600 according to the embodiment of the present invention are the same as the details described with reference to FIGS. 3 to 4 in the above sentence, and therefore, duplication is avoided here. Therefore, the duplicate description of the same details is omitted.
- the receiving unit 610 receives basic beam information and combination information transmitted from the mobile station.
- the basic beam information and the combination information are generated by the mobile station according to the basic beam reference signal transmitted from the base station.
- the basic beam information and the combination information have already been described in detail with reference to FIGS. 1 and 2, and thus the description thereof is omitted here.
- the basic beam acquisition unit 620 acquires a suitable basic beam according to the basic beam information, and the combination determination unit 630 determines whether it is necessary to perform beam combination according to the combination information. Then, if it is not necessary to perform beam combination, transmission beam determination unit 640 determines the preferred base beam as the transmission beam for the mobile station. In the subsequent data transmission process, the preferred base beam is used to transmit data to the mobile station.
- the transmission beam determination unit 640 further combines a suitable basic beam and another beam.
- FIG. 7 is an exemplary block diagram illustrating a transmission beam determination unit 640 according to one example of the present invention.
- the transmission beam determination unit 640 includes an auxiliary beam acquisition module 710 and a combination module 720.
- the auxiliary beam acquisition module 710 acquires the auxiliary beam and the auxiliary beam combination coefficient according to the combination information.
- the combination module 720 then obtains a transmission beam for the mobile station according to the preferred base beam, the auxiliary beam, and the combination factor of the auxiliary beam.
- the combination coefficient includes an amplitude coefficient and a phase coefficient.
- the transmission beam is obtained by combining the suitable basic beam and the auxiliary beam according to the above formula (1).
- the mobile station first transmits information indicating whether it is necessary to perform beam combination among the combination information, and performs beam combination when it is necessary to perform beam combination.
- the remaining information in the combination information may be transmitted after transmitting information indicating whether or not it is necessary.
- the receiving unit 610 first receives information indicating whether it is necessary to combine the beams.
- the base station determines that it is not necessary to receive the remaining information in the combination information, and determines the beam combination according to the remaining information in the combination information. Confirm that it is not necessary to do.
- the base station determines that it is necessary to receive the remaining information in the combination information, and the combination determination unit 630 It is necessary to perform beam combination according to the remaining information in the information.
- the base station shown in FIG. 6 may further include a transmission unit.
- the transmitting unit transmits the beam restriction information to the mobile station, thereby notifying the mobile station of the beam whose use is restricted.
- the mobile station generates basic beam information and combination information according to the beam restriction information, thereby avoiding collision between the beam for the mobile station and the beam for another mobile station.
- the base station determines whether or not it is necessary to perform beam combination with a suitable basic beam by receiving the basic beam information and the combination information generated by the mobile station according to the basic beam reference signal. And a transmission beam for the mobile station is determined. Therefore, even in a Massive MIMO system with a larger number of antennas, a beam that can be used when a base station subsequently communicates with the mobile station without increasing the signaling overhead for beam measurement as the number of antennas increases. Can be obtained accurately.
- the basic beam is a beam corresponding to an existing code book, good compatibility with the existing code book is ensured.
- the software module can be any type of storage medium, for example, RAM (random access memory), flash memory, ROM (read only memory), EPROM (erasable programmable ROM), EEPROM ROM (electrically erasable programmable ROM), registers, It may be stored on a hard disk, a removable disk and a CD-ROM.
- RAM random access memory
- flash memory ROM (read only memory)
- EPROM erasable programmable ROM
- EEPROM ROM electrically erasable programmable ROM
- registers It may be stored on a hard disk, a removable disk and a CD-ROM.
- Such a storage medium is connected to the processor, and the processor writes information in the storage medium or reads information from the storage medium.
- Such storage media may be further stacked in a processor.
- Such storage media and processors may be located in the ASIC.
- Such an ASIC may be arranged in the mobile station 500 and the base station 600.
- As a stand-alone unit such storage media and processors may be located in mobile station 500 and base station 600.
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Abstract
Description
Claims (8)
- チャネル状態情報を基地局装置へ報告するユーザ端末であって、
基地局から送信される1つ又は複数の基礎ビームに含まれた各基礎ビーム参照信号を受信する受信部と、
受信した前記基礎ビーム参照信号に基づいて、好適基礎ビームと、前記好適基礎ビームと組み合わせる補助ビームと、を確定させる確定部と、
前記好適基礎ビームと前記補助ビームの組み合わせに関する組み合わせ情報を前記基地局装置へ送信する送信部と、
を具備したことを特徴とするユーザ端末。 - 前記組み合わせ情報は、前記補助ビームに関する補助ビーム情報と、前記補助ビームに関する係数情報と、を含むことを特徴とする請求項1記載のユーザ端末。
- 前記係数情報は、振幅情報と位相情報を含むことを特徴とする請求項2記載のユーザ端末。
- 前記振幅情報は、前記好適基礎ビームに対して前記補助ビームを組み合わせない場合に対応して、ゼロを設定可能であることを特徴とする請求項3記載のユーザ端末。
- ユーザ端末から送信される好適基礎ビームと補助ビームの組み合わせに関する組み合わせ情報を受信する受信部と、
受信した組み合わせ情報に従って、前記好適基礎ビームと前記補助ビームを組み合わせた前記ユーザ端末に対する伝送ビームを確定させるビーム確定部と、を具備したことを特徴とする基地局装置。 - 前記ビーム確定部は、前記組み合わせ情報に含まれる前記補助ビームの振幅情報がゼロであれば、前記好適基礎ビームを伝送ビームとして確定させることを特徴とする請求項5記載の基地局装置。
- チャネル状態情報を基地局装置へ報告する無線通信方法であって、
基地局から送信される1つ又は複数の基礎ビームにそれぞれ含まれた基礎ビーム参照信号を受信するステップと、
受信した前記基礎ビーム参照信号に基づいて、好適基礎ビームと、前記好適基礎ビームと組み合わせる補助ビームと、を確定させるステップと、
前記好適基礎ビームと前記補助ビームの組み合わせに関する組み合わせ情報を前記基地局装置へ送信するステップと、
を具備したことを特徴とする無線通信方法。 - ユーザ端末から送信される好適基礎ビームと補助ビームの組み合わせに関する組み合わせ情報を受信するステップと、
受信した組み合わせ情報に従って、前記好適基礎ビームと前記補助ビームを組み合わせた前記ユーザ端末に対する伝送ビームを確定させるステップと、を具備したことを特徴とする無線通信方法。
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US16/317,994 US11418246B2 (en) | 2016-08-11 | 2017-08-10 | User terminal, base station apparatus and radio communication method |
JP2018533580A JP7136696B2 (ja) | 2016-08-11 | 2017-08-10 | ユーザ端末、基地局装置、無線通信方法及びシステム |
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