WO2017149601A1 - ビーム送受信方法、基地局、端末、および無線通信システム - Google Patents
ビーム送受信方法、基地局、端末、および無線通信システム Download PDFInfo
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- WO2017149601A1 WO2017149601A1 PCT/JP2016/056054 JP2016056054W WO2017149601A1 WO 2017149601 A1 WO2017149601 A1 WO 2017149601A1 JP 2016056054 W JP2016056054 W JP 2016056054W WO 2017149601 A1 WO2017149601 A1 WO 2017149601A1
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- base station
- terminal
- random access
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- access signal
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- 238000004891 communication Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims description 31
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 10
- 230000009977 dual effect Effects 0.000 description 10
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- 108010076504 Protein Sorting Signals Proteins 0.000 description 6
- 230000008859 change Effects 0.000 description 3
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- 239000012141 concentrate Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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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
- 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
- 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
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
-
- 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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
Definitions
- the present invention relates to a beam transmission / reception method, a base station, a terminal, and a wireless communication system in which one or more base stations forming a communication service area communicate with one or more terminals existing in each communication service area. .
- This beam forming can also be applied when the base station receives a signal from the terminal. That is, by giving the receiving antenna of the base station a direction for receiving a signal, it is possible to prevent or reduce the influence of interference waves coming from other directions.
- FIG. 13 is an explanatory diagram relating to a base station that secures a service area with a plurality of beam directions.
- the terminal In the initial connection for starting communication, the terminal first searches for a base station that can obtain sufficient signal quality for communication. In addition, the terminal searches for neighboring base stations other than the base station in communication in the same manner during the so-called handover in which the base station with which communication is performed is switched.
- FIG. 14 is an explanatory diagram showing a general handover signal sequence in a wireless communication system that does not use beamforming.
- the terminal detects signal quality degradation with a base station (communication base station) that is in communication, the terminal receives and measures a broadcast signal transmitted by the neighboring base stations. Then, the terminal reports the result together with the handover request to the current communication base station.
- a base station communication base station
- the communication base station that has received the report determines one of the neighboring base stations with the best reception quality or the neighboring base station that can obtain the signal quality necessary for communication, and determines the neighboring base station. Make a handover request. If the neighboring base station that received the request can accept the handover, it returns a message to that effect to the communication base station.
- the communication base station that has received the response indicating that the handover can be accepted transmits a handover execution command to the terminal together with information on the neighboring base station that is the handover destination (such as a base station ID).
- the terminal that has received the handover execution command transmits a random access (RACH) signal as a communication request to the neighboring base station that is the handover destination.
- RACH random access
- the terminal can know the RACH signal reception timing of the base station from the broadcast signal, and transmits the RACH signal in accordance with the timing.
- a synchronization signal necessary for the terminal to perform frequency synchronization and time synchronization with the base station and including a base station identifier (base station ID).
- Reference signal (pilot) for measuring the quality of the signal from the base station also called a signal) -This is the minimum information necessary for the terminal to communicate with the base station. For example, information on the frequency and timing used by the base station for RACH signal reception
- Patent Document 1 There is a conventional technique that discloses a method for performing an initial connection in a system using a beam forming technique (see, for example, Patent Document 1).
- one base station sequentially changes the beam direction, and a terminal transmits a signal (search signal) for searching for a base station.
- the search signal includes information related to the timing at which the base station receives the RACH signal.
- the base station changes the beam direction for transmitting the search signal and changes the beam direction for receiving the RACH signal each time the timing is changed. For this reason, there is a correspondence between the direction and timing of both the search transmission beam and the RACH signal reception beam, and the search signal includes information on the corresponding RACH signal reception timing.
- Patent Document 1 discloses that when a base station can simultaneously form a plurality of beams, a RACH signal is received by forming beams in a plurality of directions at one reception timing. At this time, only the fact that a high orthogonality is selected as the combination of the plurality of beam directions is described. Furthermore, this patent document 1 describes that the same concept is applied to handover.
- the prior art has the following problems. A time has elapsed from when the terminal receives and measures the notification signal of the neighboring base station until it transmits the RACH signal. In the meantime, the terminal may be moving. Therefore, only by the method described in Patent Document 1, the optimum beam direction that the base station directs to the terminal changes between when the terminal measures the signal of the neighboring base station and when the terminal transmits the RACH signal. There is a possibility.
- Patent Document 1 describes that a plurality of beams are formed at one timing. However, Patent Document 1 describes only combining beams that are orthogonal to each other with respect to combinations of beam directions.
- the terminal identifies the optimum beam direction from the result of receiving and measuring the notification signal of the neighboring base station, and the optimum beam direction is transmitted to the neighboring base station.
- the terminal even if the peripheral base station transmits the RACH signal at the timing when the beam is directed to the optimum beam direction for receiving the RACH signal, the terminal has already moved out of the beam area. As a result, a problem that the RACH signal cannot be correctly received occurs.
- the present invention has been made to solve the above-described problems, and suppresses a state in which a RACH signal cannot be received from a moving terminal at the time of handover, and performs handover more reliably than before.
- An object of the present invention is to obtain a beam transmission / reception method, a base station, a terminal, and a wireless communication system.
- a beam transmission / reception method is a beam transmission / reception method executed in a radio communication system in which a terminal and a base station perform communication using a beam, and is transmitted at a base station as a connection request from a terminal.
- a plurality of beam directions are grouped by combining one or more beam directions adjacent to the main beam direction in addition to the main beam direction determined to be appropriate for receiving a random access signal. , Having a first step of receiving a random access signal using a plurality of grouped beam directions.
- the base station is a base station applied to a wireless communication system that performs beam communication with a terminal, and receives a random access signal transmitted as a connection request from the terminal.
- a plurality of beam directions are grouped by combining one or more beam directions adjacent to the main beam direction in addition to the main beam direction determined to be appropriate for receiving a random access signal.
- a controller for controlling the beam direction of the unit, a transceiver for receiving a random access signal transmitted from the terminal via the antenna unit, and a detector for detecting whether or not the random access signal is received by the transceiver Is provided.
- a terminal is a terminal applied to a wireless communication system that performs beam-based communication with a base station, and the base station communicates with the terminal and a communication base station.
- a transmitter / receiver for receiving a notification signal including information on timing at which a random access signal can be received, grouped in a plurality of beam directions from a neighboring base station when configured with a neighboring base station.
- a quality measuring device that identifies each timing at which a random access signal can be received, and a plurality of broadcast signals can be determined to have appropriate communication quality 2 If the broadcast signal of the above are present, each of the timing that matches the two or more broadcast signals, and has a controller for controlling to transmit a random access signal.
- a wireless communication system is a wireless communication system including a base station and a terminal, and the base station includes a communication base station that is communicating with the terminal and a peripheral base station that is a handover destination.
- the controller in the neighboring base station groups the plurality of beam directions, first information on common timing at which a random access signal can be received for each of the grouped beam directions, and the beam A broadcast signal including second information defining the number of direction groups is generated, the broadcast signal is transmitted via a transmitter / receiver in the neighboring base station, and a controller in the terminal receives the broadcast signal from the neighboring base station.
- the timing at which the random access signal can be received is specified from the first information included in the broadcast signal, and the number of beam direction groups according to the second information is equal to the number of groups.
- a configuration in which adjacent beam directions are combined and grouped as a combination of a plurality of beam directions is provided.
- a beam transmission / reception method, a base station, a terminal, and a radio communication system capable of suppressing a state in which a RACH signal cannot be received from a moving terminal at the time of handover and performing handover more reliably than in the past.
- Embodiment 1 of this invention it is a figure which shows an example at the time of dividing the whole service area by one base station into two groups. It is a figure which shows an example at the time of dividing the whole service area by one base station into two groups in a prior art.
- wireless communications system which concerns on Embodiment 1 of this invention, it is the figure which showed the example of the relationship between the timing of alerting
- Embodiment 1 of this invention it is the figure which showed the signal sequence of a base station and a terminal in case a base station notifies the number of beam direction groups.
- wireless communications system which concerns on Embodiment 1 of this invention, it is a figure different from previous FIG. 3 which showed the example of the relationship between the timing of alerting
- FIG. 1 is a diagram illustrating an example where the entire service area of one base station is divided into two groups in Embodiment 1 of the present invention.
- FIG. 1 when there are 32 beam directions necessary to cover the service area of the base station and the number of beam directions to be combined is 16 at the same time, FIG.
- the state divided into the two groups in FIG. Ellipses surrounded by solid lines and filled in indicate the beam direction groups that are combined at the same timing to receive the RACH signal.
- group 1 in FIG. 1A combines beams in the edge direction of the service area
- group 2 in FIG. The beam is combined.
- FIG. 2 is a diagram showing an example in the case where the entire service area by one base station is divided into two groups in the prior art. Specifically, in FIG. 2, the non-adjacent beam directions are set as the same group, and two groups of FIGS. 2 (a) and 2 (b) are provided, which is different from FIG. 1 in the first embodiment. An example of grouping is shown.
- FIG. 3 is a diagram illustrating an example of a relationship between a broadcast signal transmission timing by a base station and a RACH signal reception timing in the wireless communication system according to Embodiment 1 of the present invention.
- Information 1 “Information 2”, “RA1”, and “RA2” shown in FIG. 3 respectively mean the following contents.
- Report 1 Timing of transmitting a broadcast signal in the same beam direction group as RACH signal reception group 1 •
- Report 2 Timing of transmitting a broadcast signal in the same beam direction group as RACH signal reception group 2
- RA1 RACH signal reception group 1 receives a RACH signal timing
- RA2 RACH signal reception group 2 receives a RACH signal timing
- the blank time slot is used for other signal transmission / reception.
- the base station directs the beam in the beam direction shown in FIG. 1 and performs the RACH signal detection operation.
- the terminal can determine the cycle by detecting a broadcast signal and detecting the same broadcast signal twice or more. If the terminal detects the broadcast signal having a different content, the terminal also measures the broadcast signal if the same base station is the transmission source within the cycle.
- the terminal transmits the RACH signal at the timing of “RA1”, and the highest quality is obtained at the timing of “report 2”.
- the RACH signal is transmitted at the timing of “RA2”.
- the base station In the initial connection, the base station is not sure at which timing the terminal transmits the RACH signal. For this reason, the base station performs the RACH signal detection operation equally at the two timings shown in FIG. 3 for the two beam directions shown in FIG.
- the terminal reports the measurement results of all beam directions in which the broadcast signal can be detected to the communication base station. Then, the communication base station determines the beam direction or RACH signal transmission / reception timing to be transmitted by the terminal to the handover destination base station, and notifies the handover destination base station and the terminal of such information.
- the terminal transmits a RACH signal at the same RACH signal reception timing as the beam direction. Further, when the terminal receiving the notification is notified of the RACH signal transmission / reception timing instead of the beam direction, the terminal transmits the RACH signal according to the timing.
- the handover destination base station When the handover destination base station that has received the notification from the communication base station has received the notification of the beam direction in which the handover terminal transmits the RACH signal, the handover destination base station receives the RACH signal at the group that includes the beam direction. Then, RACH signal detection of the terminal is performed. Further, when the handover destination base station receives notification of the RACH signal transmission / reception timing of the handover terminal instead of the beam direction, the handover destination base station detects the RACH signal of the terminal when receiving the RACH signal at that timing.
- the terminal has already explained that the period is determined by detecting the same notification signal twice or more. However, such period information may be directly included in the notification signal.
- the timing when the base station that receives the RACH signal is notified from the communication base station that the RACH signal is transmitted from the terminal is at the time of handover of the terminal.
- the present invention is not limited to this, and the above-described operation can be performed even when the base station that should receive the RACH signal is a wireless communication system that can know the RACH signal transmission timing of the terminal in advance.
- the terminal located at the point A measures the notification signal, it can be determined that the beam direction 1 is appropriate. However, after that, when transmitting the RACH signal, if the terminal has already moved to the area in the beam direction 2 shown in FIG. 2A, the base station cannot receive the RACH signal.
- adjacent beam directions are combined as the same group. For this reason, even when the movement of the terminal occurs, the base station can receive the RACH signal.
- the main reason is that the handover occurs when the terminal moves from the service area of another base station. That is, the terminal that performs handover normally enters from the edge direction of the service area.
- the edge direction of the service area (that is, the surrounding portion as shown in FIG. 1 (a)) is the same group, particularly from a moving terminal during handover. It is effective for receiving signals.
- FIG. 1 shows an example in which all beam directions directed to the edge of the service area are combined as the same group.
- the beam direction toward the edge of the service area must also be divided into two or more groups. There are cases.
- FIG. 4 is a diagram illustrating an example when the entire service area by one base station is divided into four groups in Embodiment 1 of the present invention.
- the area in FIG. 1A is further divided into two groups, group 1 in FIG. 4A and group 2 in FIG. 4B, and the area in FIG.
- the area is further divided into two as group 3 in FIG. 4 (c) and group 4 in FIG. 4 (d), and the number of combinations of beam directions is limited to eight at the same time. Even with such a 4-split configuration, the same effects as those of the 2-split configuration in FIG. 1 can be obtained.
- FIG. 5 is a diagram showing the configuration of the base station according to Embodiment 1 of the present invention.
- the controller 11 receives data for each terminal arriving from the network to which the base station is connected.
- the controller 11 manages the timing of sending data to each terminal or the radio resources used when sending data.
- the controller 11 also manages the timing for receiving data from the terminal and the radio resources used when receiving data. Furthermore, the controller 11 also manages the transmission timing of the notification signal and the radio resource for transmitting it.
- the controller 11 determines to send data or a notification signal to a specific terminal and notifies the modem 12 of information to be sent.
- the modem 12 performs signal modulation on the notified information and transmits it to the transceiver 13.
- the transceiver 13 converts the received modulation signal from digital to analog, and further up-converts it to a radio frequency.
- the signal processed by the transceiver 13 is transmitted from the antenna unit 14 to the terminal.
- the antenna unit 14 is controlled by the controller 11 so as to direct the beam toward the terminal to which information is sent.
- the antenna unit 14 is controlled by the controller 11 to direct the beam toward the terminal that sends the data.
- the signal received by the antenna unit 14 is transmitted to the transceiver 13.
- Controller 11 sends the received data to the network. If the received data is a handover request from the terminal, the controller 11 analyzes the notification signal measurement results of the neighboring base stations received accompanying the data.
- the base station that has received the handover request determines the appropriate surrounding base station and beam direction as a handover destination from the broadcast signal measurement result reported by the terminal in the controller 11, and makes a handover request to the corresponding surrounding base station. At this time, the base station also notifies the handover request of information such as the ID of the terminal that performs the handover.
- the base station that has received the response from the neighboring base station creates a handover execution command by the controller 11 and performs handover for the terminal that has issued the handover request through the modem 12, the transceiver 13, and the antenna unit 14. Instruct.
- the handover execution command includes the ID of the handover destination base station and timing information for transmitting the RACH signal.
- the neighboring base station that has received the handover request based on the information on the beam direction notified at the same time as the handover request, at the RACH reception timing of the beam direction group that includes the beam direction, the RACH signal of the terminal that performs the handover Wait for.
- the control of the beam direction at this time follows the operation described above with reference to FIG. 1, FIG. 3, and FIG.
- the controller 11 of the neighboring base station that is the handover destination controls the beam direction of the antenna unit 14 at the RACH signal reception timing.
- the RACH signal detector 15 performs a RACH signal detection operation on the signal input via the transceiver 13. When the RACH signal detector 15 detects the RACH signal, the RACH signal detector 15 notifies the controller 11 of RACH signal detection.
- the controller 11 Upon receiving the notification of RACH signal detection, the controller 11 generates a random access response signal, and returns the random access response signal to the terminal through the modem 12, the transceiver 13, and the antenna unit 14.
- FIG. 6 is a diagram showing a configuration of the terminal according to Embodiment 1 of the present invention.
- the controller 21 detects data generated in the terminal, and transmits the detected data to the modem 22 according to the transmission timing and radio resources allocated from the base station.
- the modem 22 performs signal modulation on the received data and transmits the data to the transceiver 23.
- the transceiver 23 converts the received modulation signal from digital to analog, and further up-converts it to a radio frequency.
- the signal processed by the transceiver 23 is transmitted from the antenna unit 24 to the base station.
- the terminal When receiving a signal, the terminal operates the controller 21, the modulator / demodulator 22, the transceiver 23, and the antenna unit 24 so that the signal addressed to the terminal can be received and demodulated at any time.
- the terminal confirms the message addressed to itself in the signal, the terminal processes the data as data addressed to itself.
- the quality measuring device 25 measures the received power level and SINR (Signal to Interference plus Noise Ratio) with respect to the signal carrying the data addressed to itself or the broadcast signal, and reports the result to the controller 21. To do.
- SINR Signal to Interference plus Noise Ratio
- the controller 21 that has received the report determines that the quality is degraded if the measured value falls below a predetermined threshold value. Further, the controller 21 instructs the quality measuring unit 25 to measure the notification signal of the neighboring base station.
- the quality measuring device 25 that has received an instruction to measure the notification signal of the surrounding base station reports the measurement result to the controller 21.
- the controller 21 Upon receiving the measurement result of the peripheral base station, the controller 21 puts this measurement result in a handover request message and transmits it to the current communication base station through the modem 22, the transceiver 23, and the antenna unit 24.
- the terminal When a handover execution command is included in the data addressed to itself received from the base station, the terminal transmits a RACH signal to the handover destination base station at the RACH signal transmission timing using the notified information. Will be. Therefore, the controller 21 instructs the RACH signal generator 26 to generate a RACH signal.
- the generated RACH signal is transmitted to the handover destination base station through the transceiver 23 and the antenna unit 24. Further, after transmitting the RACH signal, the controller 21 performs an operation of detecting a random access response from the demodulated data received from the modem 22.
- FIG. 7 is a diagram illustrating an example of a hardware configuration for realizing the base station and the terminal according to Embodiment 1 of the present invention.
- the base station shown in FIG. 5 is realized by, for example, the processor 31, the memory 32, the transmitter 33, the receiver 34, and the antenna device 35.
- the processor 31 is a CPU (Central Processing Unit, a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP), a system LSI (Large Scale Integration), or the like.
- CPU Central Processing Unit
- processing unit a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP), a system LSI (Large Scale Integration), or the like.
- LSI Large Scale Integration
- the memory 32 includes a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Programmable Memory Programmable, or an EEPROM Memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), and the like.
- RAM Random Access Memory
- ROM Read Only Memory
- flash memory an EPROM (Erasable Programmable Read Only Memory)
- EEPROM Electrically Programmable Memory Programmable, or an EEPROM Memory
- magnetic disk flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), and the like.
- the controller 11 of the base station, the modem 12 and the RACH signal detector 15 are realized by programs stored in the processor 31 and the memory 32. Specifically, it is realized by the processor 31 reading out a program for performing the operation of each unit from the memory 32 and executing it.
- the transceiver 13 is realized by a transmitter 33 and a receiver 34. That is, the transmission process in the transmitter / receiver 13 is performed in the transmitter 33, and the reception process in the transmitter / receiver 13 is performed in the receiver 34.
- the antenna unit 14 is realized by the antenna device 35.
- the terminal controller 21, modem 22 and RACH signal generator 26 shown in FIG. 6 are realized by programs stored in the processor 31 and the memory 32. Specifically, it is realized by the processor 31 reading out a program for performing the operation of each unit from the memory 32 and executing it.
- the transceiver 23 is realized by a transmitter 33 and a receiver 34. That is, transmission processing in the transmitter / receiver 23 is performed in the transmitter 33, and reception processing in the transmitter / receiver 23 is performed in the receiver 34.
- the quality measuring device 25 is also realized by the receiver 34.
- the antenna unit 24 is realized by the antenna device 35.
- FIG. 8 shows the RACH signal using the beam direction information judged appropriate by the base station designated as the handover destination base station according to Embodiment 1 of the present invention, which is notified at the same time as the handover request.
- Fig. 4 shows another way of combining adjacent beams when receiving.
- the beam direction identified as appropriate from the measurement result of the terminal is indicated by an arrow. Further, in the method shown in FIG. 8, it is assumed that the base station knows the timing at which the terminal that performs handover transmits the RACH signal, and does not transmit the RACH signal to other than the handover terminal. I have to.
- the adjacent beam direction combined with the specified beam direction is not limited to the beam directed to the edge direction of the service area of the base station, and the beam direction closer to the base station than the edge is also combined. That is, in this method, the beam directions surrounding the specified beam directions are combined.
- the base station receives the RACH signal by directing beams in all directions in the service area of the local station. You must be prepared for. For this reason, the base station cannot concentrate exclusively on receiving the RACH signal of the handover terminal.
- the situation in which the base station knows when the handover terminal transmits the RACH signal and does not transmit the RACH signal other than the handover terminal is, for example, a dual connectivity configuration standardized by the standardization organization 3GPP Can occur when.
- FIG. 9 is a diagram illustrating a wireless communication system including the dual connectivity configuration according to the first embodiment of the present invention.
- small cell base stations 1 to 3 having a small service area are scattered under a macro cell base station having a large service area.
- the terminal is connected to a macro cell base station as a main station, and further connected to a nearby small cell base station as a second base station.
- a terminal connects to a small cell base station, the terminal measures signals of neighboring small cell base stations in advance and reports the result to the macro cell base station.
- the macro cell base station determines the small cell base station to which the terminal should connect from the measurement result received, and notifies the determined small cell base station and the terminal of the connection.
- the judgment of the macro cell base station is involved. That is, the macro cell base station determines the switching destination small cell base station and instructs the terminal and the switching destination small cell base station to connect. Therefore, this small cell base station can know the timing at which the terminal transmits the RACH signal. Moreover, since it is such a connection form, a terminal does not transmit a RACH signal by its own judgment.
- the dual connectivity configuration is given as a specific example, but the wireless communication system to which the present invention is applied is not limited to such a configuration.
- the beam direction control described above can also be applied to a configuration in which another control device manages the RACH signal transmission timing of the terminal and the information is notified to the base station that should receive the RACH signal.
- this technique is applicable not only to a handover terminal but also to a terminal that performs initial connection.
- the base station and the terminal that realize the control of the beam direction can be handled by the configurations shown in FIGS.
- the terminal uses the controller 21 to determine whether to transmit the transmission signal to the macro cell base station or to the small cell base station.
- the transmitter / receiver 23 If the frequency differs depending on the destination, the transmitter / receiver 23 generates a signal by distinguishing the frequency. Alternatively, when the frequency is common and the destination base station ID is included in the signal, the controller 21 only sends the signal with the base station ID inserted to the modem 22.
- the controller 11 In order for the small cell base station to form a beam direction group for receiving the RACH signal, the controller 11 starts preparation for receiving the RACH signal after receiving notification of the RACH signal reception timing at the other base station interface. To do. At this time, the controller 11 determines which adjacent beam direction is to be grouped based on the predetermined grouping, and controls the direction in which the beam is directed to the antenna unit 14.
- the controller 11 determines to direct the beam in the same beam direction as the previous time even at the next RACH signal reception timing, and the antenna unit. 14 is controlled.
- the notified quality information of each adjacent beam direction is used to receive the RACH signal. Form a beam direction group.
- FIG. 10 is a diagram showing a handover signal sequence on the premise of the dual connectivity configuration in the wireless communication system according to the first embodiment of the present invention.
- the terminal detects quality deterioration through communication with the small cell base station 1, the terminal receives notification signals from the neighboring small cell base station 2 and the neighboring small cell base station 3, and measures their quality. Furthermore, when the quality measurement is completed, the terminal transmits a handover request including quality information for each beam to the macro cell base station.
- the macro cell base station determines an appropriate small cell base station as a handover destination from the received quality information.
- a case where a handover request is made to the small cell base station 2 is shown.
- the macro cell base station notifies the quality information of each beam to the small cell base station 2 determined to be appropriate as a handover destination.
- the macro cell base station When receiving the response from the small cell base station 2, the macro cell base station sends a handover execution command to the terminal. At this time, the macro cell base station notifies the ID of the small cell base station that is the handover destination and the timing for transmitting the RACH signal together with the handover execution command.
- the small cell base station 2 which is the handover destination also receives the handover execution command and starts preparation for receiving the RACH signal.
- the small cell base station 2 that is the handover destination determines the beam direction for receiving the RACH signal using the notified quality information of each beam.
- N beam directions may be selected from those having better quality. Note that one value can be determined in advance for N.
- the controller 21 may include the quality information of each beam direction in the transmission signal.
- the small cell base station When the small cell base station receives a handover execution command from the macro cell base station, the small cell base station only forms a group of beam directions for RACH signal reception using the quality information of each beam direction notified in advance by the controller 11. It is.
- the RACH signal detection probability can be increased with a small number of beams.
- a terminal when performing a handover in general, reports a measurement result to a communication base station, and determines a handover destination base station at the communication base station or a separately prepared control station. Even in this case, it is obvious that the same operation can be realized.
- the number of N is determined to be one value in advance.
- the beam direction is increased to N, N + 1, N + 2,.
- various methods such as N, N + 2, N + 4,... Can be employed for increasing the beam direction.
- the base station uses the quality information of the beam direction and adds the beam direction according to the priority order with good quality.
- the RACH signal detection probability can be increased by using quality information in the beam direction when increasing the number of beam directions.
- This method can be realized by the controller 11 having the base station configuration shown in FIG.
- the terminal transmits the RACH signal at any one timing when each RACH signal reception timing exists.
- the groups in the beam direction are different between RA1 and RA2 in FIG. 3, and the terminal has described the case where the RACH signal is transmitted at either timing.
- the present invention need not be limited to such timing.
- the terminal receives the notification signal 1 (report 1) and the report signal 2 (report 2) of FIG. 3, and the first quality beam is present in the report 1, and the second quality is the second.
- both RA1 and RA2 may operate to transmit a RACH signal. By performing such an operation, the probability that the base station detects the RACH signal can be increased.
- Such an operation is particularly effective when, for example, the terminal is located at the boundary between different beam direction groups as shown in FIG.
- Such an operation can be adopted not only between two groups, but also in three or more groups, and if any group can obtain a quality that allows communication, it can be applied to all the groups.
- a RACH signal may be transmitted.
- this terminal can be realized with the terminal configuration shown in FIG. If the controller 21 determines that the RACH signal can be transmitted to a plurality of beam direction groups from the result of measurement by the quality measuring unit 25, the controller 21 instructs the RACH signal generator 26 at the timing of each beam direction group. Instructs RACH signal generation.
- FIG. 11 is a diagram showing a signal sequence of the base station and the terminal when the base station notifies the number of beam direction groups in Embodiment 1 of the present invention.
- the base station notifies only the common RACH signal reception timing regardless of the beam direction group, and information on the number of beam direction groups is further added to the broadcast signal.
- the premise that the base station notifies the common RACH signal reception timing means the following. For example, in FIG. 3, while the broadcast signal 1 (report 1) and the broadcast signal 2 (report 2) are transmitted while changing the beam direction, the RACH signal reception timings of RA1 and RA2 associated with each are transmitted. Is not notified of each.
- the period (the interval between RA1 and RA2 or the interval between RA2 and RA1) is used as a common RACH signal reception timing regardless of RA1 and RA2 under the same conditions, and the interval between RA1 and RA2 and the interval between RA2 and RA1. This means that only the offset from the reference is notified.
- the terminal determines that the beam direction group transmitting the broadcast signal 1 (report 1) includes a beam direction suitable for communication of the local station, the terminal associates the RACH signal associated therewith. I do not know the transmission timing. For this reason, the RACH signal is transmitted at the timing of both RA1 and RA2 in FIG. At this time, a problem occurs particularly when the terminal cannot receive the notification signal 2 (report 2) at all.
- the terminal manages the number of RACH retransmissions and stops RACH retransmission when a predetermined number of times is reached. Also, the terminal increases transmission power little by little every time it retransmits. Therefore, as described above, when the terminal cannot know the number of beam direction groups, it is difficult to control the number of RACH retransmissions or to control increase in transmission power.
- the base station notifies the number of beam direction groups.
- FIG. 11 specifically shows an example in which the number of beam direction groups is two.
- the terminal increments the transmission counter managed by one, and further transmits the RACH signal twice (corresponding to “RACH second time” in FIG. 11). It counts that it transmitted twice. Also, the terminal increases the transmission power once every two RACH signal transmissions.
- the base station notifies the terminal of the number of beam direction groups, so that the number of RACH signal retransmissions and transmission power on the terminal side can be efficiently controlled without waste.
- These operations can also be realized by the configuration of the base station and terminal shown in FIGS.
- the base station simply puts the number of beam direction groups in the broadcast signal in the controller 11, and the terminal only controls the RACH signal retransmission count and transmission power in the controller 21.
- the beam direction is directed to one beam direction group in one time slot.
- the beam direction can be switched in one time slot.
- FIG. 12 is a diagram different from FIG. 3 above, showing an example of the relationship between the broadcast signal transmission timing by the base station and the RACH signal reception timing in the wireless communication system according to Embodiment 1 of the present invention. It is. Specifically, FIG. 12 shows an example in which there are two beam direction groups and two beam direction groups are switched within one time slot.
- the beam direction group is switched to transmit the broadcast signal 1 and the broadcast signal 2, and in another time slot, the beam direction group of the RACH signal 1 associated with the broadcast signal 1 and the broadcast signal The beam direction group of the RACH signal 2 associated with 2 is switched.
- the present invention has a configuration in which adjacent beam directions are combined as a combination of a plurality of beam directions when a RACH signal is received. As a result, it is possible to suppress a state in which a signal cannot be received from a moving terminal during a handover.
- the present invention can cover the entire service area of the base station even if a plurality of beam directions are combined, and if two or more timings are required, at least one group as a group of beam directions to be combined Has a configuration in which adjacent beam directions are combined in a direction toward the edge of the service area. As a result, handover of a terminal that has moved from the service area of another base station can be more reliably executed.
- the RACH signal receiving base station of the present invention has a configuration in which when the beam direction suitable for RACH signal reception is notified, the beam direction and the beam direction surrounding the beam direction are combined. As a result, it is possible to increase the probability of detecting the RACH signal even when the terminal moves in the direction of the base station or when an appropriate beam changes due to changes in the radio propagation environment such as shadowing or fading.
- the base station or the control station of the present invention that determines the beam direction for RACH signal transmission / reception prioritizes the beam direction that can be determined to be appropriate as the RACH signal transmission / reception beam direction, and receives information on this priority for receiving the RACH signal
- a configuration for notifying the base station is provided.
- the RACH signal receiving base station has a configuration in which a plurality of beam directions are combined based on the notified priority order when combining a plurality of beam directions for RACH signal reception. As a result, by forming the beam direction group for receiving the RACH signal using the quality information of each beam direction, the RACH signal detection probability can be increased with a small number of beams.
- the RACH signal receiving base station of the present invention when combining a plurality of beam directions, the number of combinations at the time of receiving the next RACH signal when the RACH signal is not received is the combination when the RACH signal is not received. It has a configuration that increases more than the number. As a result, the time during which the RACH signal cannot be received becomes longer, and it is possible to prevent the terminal from moving further at this time and going out of the reception beam area.
- the present invention has a configuration that can increase the number of combinations based on quality information for each beam direction. As a result, when the number of beam directions is increased, it is possible to further increase the RACH signal detection probability by using quality information in the beam direction and preferentially adopting the quality information.
- the terminal of the present invention has two or more beam directions that can be determined to be appropriate as the handover destination beam direction when receiving and measuring the broadcast signal of the neighboring base station, and the RACH signal reception timing of the base station associated therewith is different. In some cases, a RACH signal is transmitted at each timing. As a result, the probability that the base station detects the RACH signal can be increased.
- the base station of the present invention cannot cover the entire service area of the base station even if a plurality of beam directions are combined, and the number of beam direction groups is used as a broadcast signal when two or more timings are required. Including the configuration to notify the terminal. As a result, the number of RACH signal retransmissions and transmission power on the terminal side can be efficiently controlled without waste.
- the present invention has a configuration for switching the beam direction in one time slot. As a result, it is possible to reduce the time spent performing broadcast signal transmission and RACH signal reception, and to increase the number of time slots allocated for communication.
Abstract
Description
・端末が基地局に周波数同期および時間同期をとるために必要で、かつ、基地局の識別子(基地局ID)を含む同期信号
・基地局からの信号の品質を測定するためのリファレンス信号(パイロット信号とも呼ぶ)
・端末が基地局との通信に至るまでに最低限必要な情報であり、例えば、基地局がRACH信号受信で使用している周波数とタイミングの情報
端末が、周辺基地局の報知信号を受信・測定してから、RACH信号を送信するまでには、時間が経過している。また、その間に、端末は、移動している可能性がある。従って、特許文献1に記載されている方法だけでは、端末が周辺基地局の信号を測定した時点と、端末がRACH信号を送信する時点とでは、基地局が端末へ向ける最適なビーム方向が変わっている可能性がある。
まず始めに、本発明に基づく、複数ビーム方向を組み合わせる方法について、図面を用いて説明する。図1は、本発明の実施の形態1において、1つの基地局によるサービスエリア全体を2つのグループに分けた場合の一例を示す図である。
・「報1」:RACH信号受信グループ1と同じビーム方向のグループで、報知信号を送信するタイミング
・「報2」:RACH信号受信グループ2と同じビーム方向のグループで、報知信号を送信するタイミング
・「RA1」:RACH信号受信グループ1で、RACH信号を受信するタイミング
・「RA2」:RACH信号受信グループ2で、RACH信号を受信するタイミング
Claims (16)
- 端末と基地局とがビームを使用した通信を行う無線通信システムにおいて実行されるビーム送受信方法であって、
前記基地局において、
前記端末からの接続要求として送信されるランダムアクセス信号を受信する際に、前記ランダムアクセス信号を受信するために適切と判断される主ビーム方向に加えて、前記主ビーム方向に隣接する1以上のビーム方向を組み合わせて、複数のビーム方向をグループ化し、グループ化された複数のビーム方向を用いて前記ランダムアクセス信号を受信する第1ステップを有する
ビーム送受信方法。 - 前記第1ステップは、前記複数のビーム方向を組み合わせてグループ化された1つのグループによっても、前記基地局のサービスエリアの全領域をカバーできず、前記サービスエリアを複数のグループに分割する必要がある場合には、少なくとも1つのグループを、前記サービスエリアのエッジ方向で互いに隣接する複数のビーム方向を組み合わせることでグループ化する
請求項1に記載のビーム送受信方法。 - 前記第1ステップは、前記主ビーム方向と、前記主ビーム方向を囲むビーム方向とを組み合わせることで前記複数のビーム方向をグループ化する
請求項1に記載のビーム送受信方法。 - 前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記周辺基地局において、
前記複数のビーム方向をグループ化する第2ステップと、
前記第2ステップでグループ化された複数のビーム方向を用いて、前記ランダムアクセス信号の受信処理を実行する第3ステップと、
前記第3ステップにおいて、前記第2ステップでグループ化された前記複数のビーム方向を用いても、前記ランダムアクセス信号の受信ができなかった場合には、前記第2ステップによりグループ化されたビーム方向の本数をさらに増やして再グループ化する第4ステップと、
前記第4ステップで再グループ化された複数のビーム方向を用いて、前記ランダムアクセス信号の受信処理を再実行する第5ステップと
を有する請求項1に記載のビーム送受信方法。 - 前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記通信基地局において、
前記端末から送信される前記ランダムアクセス信号を前記周辺基地局で受信する際に通信品質が適切と判断できる複数のビーム方向について優先順位を付けた優先順位情報を生成し、前記優先順位情報を前記周辺基地局に送信する第6ステップ
を有し、
前記周辺基地局において、
前記通信基地局から取得した前記優先順位情報に基づいて、前記通信品質の高いものを優先して複数のビーム方向をグループ化する第7ステップと、
前記第7ステップでグループ化された複数のビーム方向を用いて、前記ランダムアクセス信号の受信処理を実行する第8ステップと
を有する
請求項1に記載のビーム送受信方法。 - 前記周辺基地局において、
前記第8ステップにおいて、前記第7ステップでグループ化された前記複数のビーム方向を用いても、前記ランダムアクセス信号の受信ができなかった場合には、前記優先順位情報に基づいて前記通信品質の高いものを優先して、前記第7ステップによりグループ化されたビーム方向の本数をさらに増やして再グループ化する第9ステップと、
前記第9ステップで再グループ化された複数のビーム方向を用いて、前記ランダムアクセス信号の受信処理を再実行する第10ステップと
をさらに有する請求項5に記載のビーム送受信方法。 - 前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記周辺基地局において、
前記複数のビーム方向をグループ化し、グループ化した前記複数のビーム方向のそれぞれについて、ランダムアクセス信号を受信できるタイミングに関する情報を含む報知信号を送信する第11ステップと、
前記端末において、
前記周辺基地局から、前記報知信号を受信する第12ステップと、
前記第12ステップで前記報知信号として異なるグループに対応する複数の報知信号を受信した場合には、前記複数の報知信号の受信状態からそれぞれの報知信号の通信品質を測定するとともに、前記複数の報知信号に対応してランダムアクセス信号を受信できるそれぞれのタイミングを特定する第13ステップと、
前記複数の報知信号の中に、前記通信品質が適切と判断できる2以上の報知信号が存在する場合には、前記2以上の報知信号に合ったそれぞれのタイミングで、ランダムアクセス信号を送信する第14ステップと
を有する請求項1に記載のビーム送受信方法。 - 前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記周辺基地局において、
前記複数のビーム方向をグループ化し、グループ化した前記複数のビーム方向のそれぞれについて、ランダムアクセス信号を受信できる共通のタイミングに関する第1情報、およびビーム方向グループ数を規定する第2情報を含む報知信号を送信する第15ステップと、
前記端末において、
前記周辺基地局から、前記報知信号を受信する第16ステップと、
前記報知信号に含まれている前記第1情報からランダムアクセス信号を受信できるタイミングを特定し、前記第2情報による前記ビーム方向グループ数と一致する回数を前記ランダムアクセス信号の送信回数として特定する第17ステップと、
特定した前記タイミングで、特定した前記送信回数にわたり、ランダムアクセス信号を送信する第18ステップと
を有する請求項1に記載のビーム送受信方法。 - 端末との間でビームを使用した通信を行う無線通信システムに適用される基地局であって、
前記端末からの接続要求として送信されるランダムアクセス信号を受信する際に、前記ランダムアクセス信号を受信するために適切と判断される主ビーム方向に加えて、前記主ビーム方向に隣接する1以上のビーム方向を組み合わせて、複数のビーム方向をグループ化することで、アンテナ部のビーム方向を制御する制御器と、
前記アンテナ部を介して、前記端末から送信された前記ランダムアクセス信号を受信する送受信器と、
前記送受信器で前記ランダムアクセス信号が受信されたか否かを検出する検出器と
を備える基地局。 - 前記制御器は、前記複数のビーム方向を組み合わせてグループ化された1つのグループによっても、前記基地局のサービスエリアの全領域をカバーできず、前記サービスエリアを複数のグループに分割する必要がある場合には、少なくとも1つのグループは、前記サービスエリアのエッジ方向で互いに隣接する複数のビーム方向を組み合わせることでグループ化する
請求項9に記載の基地局。 - 前記制御器は、前記主ビーム方向と、前記主ビーム方向を囲むビーム方向とを組み合わせることで前記複数のビーム方向をグループ化する
請求項9に記載の基地局。 - 前記基地局は、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成され、
前記周辺基地局は、
前記複数のビーム方向をグループ化して、前記ランダムアクセス信号の1回目の受信処理を実行し、
前記1回目の受信処理において、前記ランダムアクセス信号の受信ができなかった場合には、すでにグループ化されたビーム方向の本数をさらに増やして再グループ化して、前記ランダムアクセス信号の2回目の受信処理を再実行する
請求項9に記載の基地局。 - 前記基地局は、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成され、
前記通信基地局は、
前記端末から送信される前記ランダムアクセス信号を受信する際に通信品質が適切と判断できる複数のビーム方向について優先順位を付けた優先順位情報を生成し、前記優先順位情報を前記周辺基地局に送信し、
前記周辺基地局は、
前記通信基地局から取得した前記優先順位情報に基づいて、前記通信品質の高いものを優先して複数のビーム方向をグループ化し、
グループ化した前記複数のビーム方向を用いて、前記ランダムアクセス信号の1回目の受信処理を実行する
請求項9に記載の基地局。 - 前記周辺基地局は、
前記1回目の受信処理において、前記ランダムアクセス信号の受信ができなかった場合には、前記優先順位情報に基づいて前記通信品質の高いものを優先して、すでにグループ化されたビーム方向の本数をさらに増やして再グループ化して、前記ランダムアクセス信号の2回目の受信処理を再実行する
請求項13に記載の基地局。 - 基地局との間でビームを使用した通信を行う無線通信システムに適用される端末であって、
前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記周辺基地局から、複数のビーム方向にグループ化され、ランダムアクセス信号を受信できるタイミングに関する情報が含まれた報知信号を受信する送受信器と、
前記送受信器において前記報知信号として異なるグループに対応する複数の報知信号を受信した場合には、前記複数の報知信号の受信状態からそれぞれの報知信号の通信品質を測定するとともに、前記複数の報知信号に対応してランダムアクセス信号を受信できるそれぞれのタイミングを特定する品質測定器と、
前記複数の報知信号の中に、前記通信品質が適切と判断できる2以上の報知信号が存在する場合には、前記2以上の報知信号に合ったそれぞれのタイミングで、ランダムアクセス信号を送信するように制御する制御器と
を有する端末。 - 請求項9に記載の基地局と、請求項15に記載の端末とを備えた無線通信システムであって、
前記基地局が、前記端末と通信中である通信基地局と、ハンドオーバ先である周辺基地局とで構成されている場合に、
前記周辺基地局内の制御器は、
前記複数のビーム方向をグループ化し、グループ化した前記複数のビーム方向のそれぞれについて、ランダムアクセス信号を受信できる共通のタイミングに関する第1情報、およびビーム方向グループ数を規定する第2情報を含めた報知信号を生成し、前記周辺基地局内の送受信器を介して、前記報知信号を送信し、
前記端末内の制御器は、
前記周辺基地局から、前記報知信号を受信した場合には、前記報知信号に含まれている前記第1情報からランダムアクセス信号を受信できるタイミングを特定し、前記第2情報による前記ビーム方向グループ数と一致する回数を前記ランダムアクセス信号の送信回数として特定し、特定した前記タイミングで、特定した前記送信回数にわたり、ランダムアクセス信号を送信する
無線通信システム。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2016/056054 WO2017149601A1 (ja) | 2016-02-29 | 2016-02-29 | ビーム送受信方法、基地局、端末、および無線通信システム |
CN201680082762.8A CN108781374B (zh) | 2016-02-29 | 2016-02-29 | 波束发送接收方法、基站、终端和无线通信系统 |
US16/061,795 US10897717B2 (en) | 2016-02-29 | 2016-02-29 | Beam transmission-reception method, base station, terminal, and wireless communication system |
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CN108781374B (zh) | 2021-09-21 |
US10897717B2 (en) | 2021-01-19 |
EP3425949A4 (en) | 2019-02-27 |
US20180368005A1 (en) | 2018-12-20 |
EP3425949B1 (en) | 2023-09-13 |
EP3425949A1 (en) | 2019-01-09 |
JPWO2017149601A1 (ja) | 2018-03-22 |
CN108781374A (zh) | 2018-11-09 |
JP6525357B2 (ja) | 2019-06-05 |
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