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WO2018163230A1 - Terminal mobile, station de base sans fil et procédé de transmission et de réception de faisceau - Google Patents

Terminal mobile, station de base sans fil et procédé de transmission et de réception de faisceau Download PDF

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Publication number
WO2018163230A1
WO2018163230A1 PCT/JP2017/008661 JP2017008661W WO2018163230A1 WO 2018163230 A1 WO2018163230 A1 WO 2018163230A1 JP 2017008661 W JP2017008661 W JP 2017008661W WO 2018163230 A1 WO2018163230 A1 WO 2018163230A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
channel quality
mobile terminal
radio base
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/008661
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English (en)
Japanese (ja)
Inventor
賢司 加瀬
福井　範行
啓二郎 武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2017545700A priority Critical patent/JPWO2018163230A1/ja
Priority to PCT/JP2017/008661 priority patent/WO2018163230A1/fr
Publication of WO2018163230A1 publication Critical patent/WO2018163230A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04B7/0417—Feedback systems
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a communication technique between a radio base station and a terminal using a beam having directivity to which a beam forming technique is applied.
  • the use of high frequency bands such as millimeter waves is expected to expand the data communication capacity. Since the propagation loss of radio waves increases as the frequency increases, the 5G system improves the power utilization efficiency by using a directional beam that concentrates radio waves in a specific direction by beam forming technology for signal transmission and reception. Is being considered. By using a directional beam, it is possible to improve antenna gain and reduce interference or interference with other radio waves.
  • the base station transmits directional beams in multiple different directions, and the terminal measures the reception quality (channel quality) of each directional beam transmitted by the base station and transmits the measurement results to the base station. To do. The base station determines the transmission direction of the beam addressed to the terminal based on the quality information of the directional beam transmitted by the terminal.
  • the base station transmits a beam including a reference signal
  • the terminal measures the channel quality of the received beam, and reports the whole or the top several measurement results to the base station.
  • the channel quality is at least one of SNR (Signal Noise Ratio), CINR (Carrier Interference Noise Ratio), and RSSI (Receive Signal Strength Ratio).
  • the conventional beam switching described above is based on the premise that the terminal reports the channel quality measured at the time of reception of the beam including the reference signal transmitted by the base station to the base station. Even when there is no problem in channel quality and beam switching is unnecessary, the measurement result is reported to the base station, and there is a problem that unnecessary communication from the terminal to the base station occurs.
  • the present invention has been made in view of the above, and provides a mobile terminal, a radio base station, and a beam transmission / reception method capable of reducing reporting of channel quality measurement results to a base station when beam switching is unnecessary.
  • the purpose is to obtain.
  • a mobile terminal is a mobile terminal that communicates with a radio base station that constitutes a communication range by a set of irradiation ranges of one or more directional beams transmitted in a plurality of directions, and is received by an antenna Corresponding based on the reference signal included in the directional beam of each direction received and processed in the transceiver unit, and the transceiver unit that performs the reception process of the radio signal of the directional beam and the transmission process of the signal transmitted from the antenna
  • a measurement unit that measures the channel quality of the directional beam to be measured, and the measured channel quality when the measured channel quality is better than the channel quality of the directional beam in the direction used for communication with the radio base station.
  • a control unit that determines to report the quality to the radio base station.
  • a radio base station is a radio base station that communicates with a mobile terminal by composing a communication range by a set of irradiation ranges of one or more directional beams transmitted in a plurality of directions, and is received by an antenna.
  • a transmission / reception unit and a transmission / reception unit that perform reception processing of a received radio signal, transmission processing of a signal transmitted from an antenna with a directional beam, and a generation unit that generates a reference signal transmitted with a directional beam in each direction
  • the channel quality of the directional beam measured based on the reference signal at the mobile terminal is extracted from the signal received and processed by the transmission / reception unit, and the beam control information is transmitted to the mobile terminal at a predetermined transmission timing as a response.
  • a control unit for generating for generating.
  • a radio base station forms a communication range by a set of irradiation ranges of one or more directional beams transmitted in a plurality of directions, and communicates with mobile terminals located in the communication range.
  • a beam transmission / reception method in a communication system wherein a radio base station transmits a reference signal with a directional beam, and a mobile terminal measures channel quality of a corresponding directional beam based on the reference signal; The mobile terminal, when the measured channel quality is better than the channel quality corresponding to the directional beam being used, reporting the measured channel quality to the radio base station. is there.
  • FIG. 1 is a block diagram showing a configuration example of a radio communication system 10 using a radio base station 100 and a mobile terminal 200 according to this embodiment.
  • the radio base station 100 irradiates one or more directional beams simultaneously in a plurality of different directions, and a communication range (cell) with the mobile terminal 200 is configured by combining the irradiation ranges of the respective directional beams.
  • a broken line and a solid line ellipse indicate an irradiation range of one directional beam.
  • the radio base station 100 and the mobile terminal 200 moves from the irradiation range 30 to the irradiation range 31, the radio base station 100 and the mobile terminal
  • the beam used for communication 200 is switched from the directional beam 20 to the directional beam 21 by beam switching.
  • the directional beam irradiated to each irradiation range can be identified by an identifier (beam ID) for identifying the directional beam.
  • FIG. 2 is a block diagram showing an example of a functional configuration of the radio base station 100 of this embodiment.
  • the radio base station 100 includes a control unit 101, a transmission / reception unit 103, a generation unit 104, and an antenna 105.
  • the antenna 105 transmits a radio signal to the terminal 200 and receives a radio signal transmitted by the mobile terminal 200.
  • the antenna 105 includes one or more antenna elements, and can generate one or more directional beams by beam forming.
  • the transmission / reception unit 103 performs transmission processing on a signal transmitted from the antenna 105 using a directional beam, and performs reception processing on a radio signal received by the antenna 105.
  • the transmission process and the reception process are general processes performed at the time of transmission and reception of radio signals such as encoding, decoding, modulation, demodulation, digital analog conversion, and frequency conversion.
  • the control unit 101 extracts channel quality information that is a measurement result of the reception quality (channel quality) of the directional beam transmitted by the radio base station 100 from the radio signal received and processed by the transmission / reception unit 103. Then, it is determined whether beam switching is necessary for the target mobile terminal 200 based on the extracted channel quality information. When it is determined that beam switching needs to be performed, it is determined which directional beam is allocated to the terminal, at what timing beam switching is performed, and the like.
  • the control unit 101 outputs a control signal for causing the mobile terminal 200 to perform beam switching to the transmission / reception unit 103 and transmits the control signal to the mobile terminal 200.
  • the generation unit 104 generates a reference signal to be transmitted with each directional beam in accordance with an instruction from the control unit 101.
  • an existing method such as the method disclosed in International Publication No. WO2017 / 006470A1 may be used except for the matters described below.
  • FIG. 3 is a block diagram illustrating an example of a hardware configuration of the radio base station 100.
  • the radio base station 100 includes a processor 110, a memory 111, a transmitter 112, a receiver 113, and an antenna 114.
  • the processor 110 is a general-purpose processor, a DSP (Digital Signal Processor) or the like
  • the memory 111 is a volatile or non-volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, A storage medium such as a magnetic disk.
  • the transmitter 112 and the receiver 113 are realized by a circuit of ASIC (Application Specific Specific Integrated Circuit) and FPGA (Field Programmable Gate Array).
  • the processor 110, the memory 111, the transmitter 112, the receiver 113, and the antenna 114 are connected by a system bus 115.
  • the control unit 101 and the generation unit 104 of the radio base station 100 are realized by the processor 110 executing a program stored in the memory 111.
  • the transmission / reception unit 103 is realized by the transmitter 112 and the receiver 113.
  • the antenna 105 corresponds to the antenna 114. Note that at least part of the functions of the control unit 101 and the generation unit 104 may be realized by an ASIC or the like, or at least part of the function of the transmission / reception unit 103 may be realized by a program.
  • FIG. 4 is a block diagram showing an example of the functional configuration of the mobile terminal 200 according to this embodiment.
  • the mobile terminal 200 includes a control unit 201, a transmission / reception unit 203, a measurement unit 204, and an antenna 205.
  • the antenna 205 transmits a radio signal to the radio base station 100 and receives a radio signal transmitted by the radio base station 100.
  • the antenna 205 includes one or more antenna elements, and can generate one or more directional beams by beam forming.
  • the transmission / reception unit 203 performs transmission processing on a signal transmitted from the antenna 205, and performs reception processing on a radio signal received by the antenna 105.
  • Transmission processing and reception processing are general processing performed at the time of transmission and reception of radio signals such as encoding, decoding, modulation, demodulation, digital analog conversion, and frequency conversion.
  • the transmission / reception unit 203 outputs the received signal to the control unit 201 and the measurement unit 204.
  • the measurement unit 204 detects the reference signal transmitted from the radio base station 100 from the signal received and processed by the transmission / reception unit 203, measures the reception quality of the detected reference signal as the channel quality of the directional beam, and the measurement result (channel quality) Information) to the control unit 201.
  • the quality to be measured may be any quality that can be used as the quality of the radio signal, such as SNR (Signal-to-Noise-Ratio), CINR (Carrier-to-Interference-and-Noise-Ratio), RSSI (Receive-Signal-Strength-Ratio).
  • the control unit 201 notifies the notified channel quality information to the transmission / reception unit 203 as information to be transmitted to the radio base station 100, and the channel quality information is transmitted to the radio base station 100. Also, the control unit 201 acquires a control signal related to beam switching transmitted from the radio base station 100 from the signal received and processed by the transmission / reception unit 203.
  • FIG. 5 is a block diagram illustrating an example of a hardware configuration of the mobile terminal 200.
  • the mobile terminal 200 includes a processor 210, a memory 211, a transmitter 212, a receiver 213, and an antenna 214, which are connected to each other via a system bus 215. These are the same as the processor 110, the memory 111, the transmitter 112, the receiver 113, and the antenna 114 shown in FIG.
  • the control unit 201 and the measurement unit 204 of the mobile terminal 200 are realized by the processor 210 executing a program stored in the memory 211.
  • the transmission / reception unit 203 is realized by the transmitter 212 and the receiver 213.
  • the antenna unit 205 corresponds to the antenna 214.
  • the control unit 101 determines the timing for transmitting the reference signal with a directional beam, and the generation unit 104 generates a control signal according to the determination of the control unit 101 (S100). And the transmission / reception part 103 performs the transmission process of the produced
  • the radio base station 100 performs the processes of S100 and S101 in a plurality of different directions in order to cover the cell of the own device. At this time, if the radio base station 100 can simultaneously transmit a plurality of directional beams, the processes of S100 and S101 may be performed for each directional beam.
  • the directional beam that transmits the reference signal includes an identifier (beam ID) that can identify the directional beam according to the transmission direction.
  • the radio base station 100 may notify the mobile terminal 200 in advance of the timing for transmitting a reference signal and information on channel quality measurement as broadcast information or as signaling information by RRC (Radio Resource Control) or the like.
  • the information on the channel quality measurement specifically includes a report method of the channel quality measurement result (report by opportunity, periodic report), report cycle, and the like.
  • the antenna 205 receives the directional beam transmitted from the radio base station 100, and the received signal is received and processed by the transmission / reception unit 203. Then, the measurement unit 204 detects a reference signal included in the received signal, and measures the channel quality of the received directional beam based on the detected reference signal (S102). The measurement unit 204 notifies the control unit 201 of the measurement result together with the beam ID. Note that the measurement unit 204 measures the channel quality for each received directional beam and notifies the control unit 201 of the channel quality. When receiving the notification of the channel quality measurement result from the measurement unit 204, the control unit 201 determines whether or not it is necessary to report the received measurement result to the radio base station 100 (S103).
  • FIG. 7 is a flowchart illustrating an example of a detailed flow of the determination process in S103.
  • the control unit 201 Upon receiving the measurement result notification from the measurement unit 204, the control unit 201 identifies the beam with the best channel quality from among the beams receiving the measurement result notification (S201). Then, the control unit 201 determines whether or not the identified beam is a beam currently in use (S202). If the identified beam is a beam currently in use, the process is terminated. On the other hand, when the identified beam is not a currently used beam, it is determined to report the channel quality of the identified beam to the radio base station 100 (S203). Note that the process of S103 may be performed periodically instead of being triggered by the notification of the channel quality from the measurement unit 204.
  • the control unit 201 When it is determined to report the channel quality measured to the radio base station 100 in the process of S103, the control unit 201 notifies the transmission / reception unit 203 of the channel quality measurement result of the directional beam to be reported as channel quality information. Then, the transmission / reception unit 203 transmits the channel quality information, and the channel quality information is wirelessly transmitted from the antenna 205 to the radio base station 100 (S104).
  • the channel quality information notified in S104 may include the corresponding beam ID, or the beam ID is not necessarily included as long as the directional beam corresponding to the channel quality information can be specified. Good.
  • a plurality of higher ranks with good channel quality may be reported.
  • channel quality information is transmitted to the radio base station 100 using a channel similar to PUCCH (Physical Uplink Control Channel) defined in LTE (Long Termination Evolution) or PUSCH (Physical Uplink Shared Channel). Also good.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • PUSCH is a data channel for transmitting uplink data, which is a direction from a mobile terminal to a radio base station, and PUCCH notifies uplink radio resource allocation requests, downlink channel quality information, and the like. Control channel.
  • the antenna 105 receives the radio signal transmitted from the mobile terminal 200, and the received signal is subjected to reception processing by the transmission / reception unit 103 and input to the control unit 101. Then, the control unit 101 acquires channel quality information from the signal input from the transmission / reception unit 103. And the control part 101 determines the directional beam used for communication with the mobile terminal 200 based on the acquired channel quality information (S105).
  • S105 channel quality information
  • a method for determining a directional beam in the process of S105 for example, when channel quality information of one beam is received, the beam is determined as a communication beam, and channel quality information of a plurality of beams is received. In such a case, a method of determining the beam with the best quality can be considered.
  • the present invention does not limit the method of determining the directional beam to be used, but may be determined by a method different from the above method.
  • the control unit 101 of the radio base station 100 creates a message (beam control information notification) for notifying the terminal 200 of the beam ID of the directional beam to be used determined in the process of S105 and notifies the transmission / reception unit 103 of the message.
  • the beam control information notification corresponds to the control signal related to the beam switching described above.
  • the beam control information notification is transmitted by the transmitting / receiving unit 103 and transmitted from the antenna 105 to the terminal 200 (S106).
  • S106 the terminal 200
  • An information notification is transmitted, and the directional beam used for the mobile terminal 200 is notified.
  • the beam control information notification may be a message transmitted as a response to the received channel quality information. If the directional beam to be used is not changed, the current directional beam is measured and used, and the change is made. You may make it notify that it does not.
  • the beam control information notification is transmitted at the timing of the subframe after k offsets from the timing when the radio base station 100 receives the channel quality information from the mobile terminal 200.
  • k is a predetermined integer of 1 or more.
  • the mobile terminal 200 can predict the timing for receiving the beam control information notification from the radio base station 200, and performs the beam control information notification analysis processing as receiving the beam control information notification at the predicted timing. Is possible.
  • the radio base station 100 may notify the mobile terminal 200 of the offset k by broadcast information or an RRC message.
  • FIG. 8 is a format diagram showing an example of the configuration of the beam control information notification.
  • the beam control information notification is composed of an 8-bit communication beam ID field.
  • the beam ID of the directional beam to be used determined in the process of S105 is set.
  • the message configuration shown in FIG. 8 is an example, the communication beam ID is not limited to 8 bits, and the beam control information notification may include fields other than the communication beam ID.
  • a channel similar to PDCCH (Physical Downlink Control Channel) defined in LTE or PDSCH (Physical Downlink Shared Channel) may be used.
  • the PDSCH is a data channel that transmits data in the downlink direction, which is a direction from the radio base station to the mobile terminal, and the PDCCH is a control channel that notifies allocation information of uplink radio resources and the like.
  • FIG. 9 is a flowchart showing a flow of processing related to reception of beam control information notification performed by the mobile terminal 200.
  • the control unit 201 of the mobile terminal 200 waits for a beam control information notification that is expected to be received in a subframe after k subframes from the timing at which the channel quality information notification is transmitted, and performs beam control at the scheduled reception timing. It is determined whether an information notification has been received (S301). When the reception of the beam control information notification is determined in the process of S301, the control unit 201 acquires the communication beam ID from the received beam control information notification (S302). Then, the control unit 201 determines whether or not the communication beam ID is the same as the beam ID of the directional beam currently used (S304). If it is determined in step S304 that they are not the same, the control unit 201 ends the beam control information notification reception processing by beam switching processing for changing the directional beam used for communication. If it is determined that the process is the same in step S304, the control unit 201 ends the beam control information notification reception process.
  • step S301 if it is determined in step S301 that the beam control information notification has not been received, the control unit 201 retransmits the channel quality information (S302), and ends the beam control information notification reception process.
  • the process performed in S302 is the same as the first transmission process (S104).
  • the beam control information notification corresponding to the retransmitted channel quality information may not be received.
  • the number of retransmissions is determined in advance and the above-described processing is repeated. It is also possible to notify the mobile terminal 200 of the number of retransmissions from the radio base station 100 by broadcast information or an RRC message.
  • FIG. 10 is a sequence diagram showing an operation when the channel quality information transmitted by the mobile terminal 200 is not normally received by the radio base station 100 and the beam control information notification is not transmitted.
  • the radio base station 100 when the channel quality information transmitted in the process of S104 is not normally received by the radio base station 100, the radio base station 100 does not perform the processes of S105 and S106, and the mobile terminal 200 notifies the beam control information. Not receive.
  • the mobile terminal 200 performs the process of S302 in S301 (not receiving the beam control information notification).
  • the radio base station 100 When the radio base station 100 receives the retransmitted channel quality information transmitted in the process of S302, the processes of S105 and S106 are performed, and when the radio terminal 200 receives the beam control information notification normally, the radio base station 100 performs S301 (beam control information). Notification is received) and the processing after S303 is performed.
  • S301 beam control information
  • FIG. 11 is a sequence diagram showing an operation when the beam control information notification is not normally received by the mobile terminal 200. If the beam control information notification transmitted in the first process of S106 is unsuccessful, the processes of S301, S302, S105, S106, and S301 are performed as in the sequence diagram of FIG. Here, it is assumed that the radio base station 100 performs the same processing as the first time in the second reception of the channel quality information.
  • FIG. 12 is a sequence diagram showing an operation when a transmission window of n (n is an integer of 1 or more) subframes is provided.
  • n is an integer of 1 or more subframes.
  • the radio base station 100 determines the directional beam to be used by the process of S105, counting from the timing at which the channel quality information is received, and any one of k subframes to k + n subframes in S106. Processing is performed, and a beam control information notification is transmitted to the mobile terminal 200.
  • the mobile terminal 200 waits for reception of a beam control information notification by providing a window of n subframes.
  • the determination that the beam control information notification has not been received is performed after k + n subframes from the timing at which the channel quality information is transmitted.
  • the reference signal transmitted by the radio base station in which the mobile terminal transmits directional beams in a plurality of different directions using the respective directional beams If the other directional beam has a better quality than the current directional beam, the measurement result of the directional beam with the higher quality is transmitted to the radio base station, and the mobile terminal transmits Since the radio base station that has received the measurement result transmits a response to the received measurement result, the mobile terminal does not notify the unnecessary measurement result when the quality of the current directional beam is good, Further, the mobile terminal can wait for a response transmitted by the radio base station, and can transmit the measurement result again when the response is not received. Thereby, transmission of unnecessary measurement results in the uplink direction can be reduced.
  • the possibility that the measurement result is not normally received by the radio base station can be reduced. Further, it is possible to reduce the transmission of the downlink control message by notifying the directional beam used by the mobile terminal using the response from the radio base station.
  • 10 wireless communication system 20, 21 directional beam, 30, 31 irradiation range, 100 wireless base station, 101 control unit, 103 transmission / reception unit, 104 generation unit, 105 antenna, 110 processor, 111 memory, 112 transmitter, 113 reception Unit, 114 antenna, 115 system bus, 200 mobile terminal, 201 control unit, 203 transmission / reception unit, 204 measurement unit, 205 antenna, 210 processor, 211 memory, 212 transmitter, 213 receiver, 214 antenna, 215 system bus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un terminal mobile, lequel communique avec une station de base sans fil qui forme une plage de communication avec un ensemble de plages d'irradiation d'un ou plusieurs faisceaux directionnels à transmettre dans une pluralité de directions, qui comprend : une unité de transmission et de réception (203) qui met en oeuvre un processus de réception de signaux sans fil de faisceaux directionnels reçus par des antennes et un processus de transmission de signaux à transmettre à partir d'antennes; une unité de mesure (204) qui mesure, sur la base de signaux de référence inclus dans les faisceaux directionnels de directions respectives qui sont traitées par réception dans l'unité de transmission et de réception, la qualité de canal d'un faisceau directionnel correspondant; et une unité de commande (201) qui décide de rapporter la qualité de canal mesurée à la station de base sans fil, lorsque la qualité de canal mesurée est meilleure que la qualité de canal d'un faisceau directionnel qui est utilisé dans une direction de communication avec la station de base sans fil.
PCT/JP2017/008661 2017-03-06 2017-03-06 Terminal mobile, station de base sans fil et procédé de transmission et de réception de faisceau Ceased WO2018163230A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2017545700A JPWO2018163230A1 (ja) 2017-03-06 2017-03-06 移動端末、無線基地局、およびビーム送受信方法
PCT/JP2017/008661 WO2018163230A1 (fr) 2017-03-06 2017-03-06 Terminal mobile, station de base sans fil et procédé de transmission et de réception de faisceau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/008661 WO2018163230A1 (fr) 2017-03-06 2017-03-06 Terminal mobile, station de base sans fil et procédé de transmission et de réception de faisceau

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WO2018163230A1 true WO2018163230A1 (fr) 2018-09-13

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010537599A (ja) * 2007-09-12 2010-12-02 シャープ株式会社 時間・空間・周波数領域に基づく情報フィードバック方法、ユーザ装置、および基地局
JP2013093879A (ja) * 2008-07-30 2013-05-16 Hitachi Ltd 無線通信システム、基地局および無線通信方法
JP2015185952A (ja) * 2014-03-20 2015-10-22 株式会社Ｎｔｔドコモ 移動通信システム、基地局、およびユーザ装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010537599A (ja) * 2007-09-12 2010-12-02 シャープ株式会社 時間・空間・周波数領域に基づく情報フィードバック方法、ユーザ装置、および基地局
JP2013093879A (ja) * 2008-07-30 2013-05-16 Hitachi Ltd 無線通信システム、基地局および無線通信方法
JP2015185952A (ja) * 2014-03-20 2015-10-22 株式会社Ｎｔｔドコモ 移動通信システム、基地局、およびユーザ装置

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