WO2020217455A1 - Dispositif terminal, dispositif de station de base, et procédé de communication sans fil - Google Patents

Dispositif terminal, dispositif de station de base, et procédé de communication sans fil Download PDF

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Publication number
WO2020217455A1
WO2020217455A1 PCT/JP2019/017924 JP2019017924W WO2020217455A1 WO 2020217455 A1 WO2020217455 A1 WO 2020217455A1 JP 2019017924 W JP2019017924 W JP 2019017924W WO 2020217455 A1 WO2020217455 A1 WO 2020217455A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal device
station device
beam control
request information
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PCT/JP2019/017924
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English (en)
Japanese (ja)
Inventor
雅 伏木
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ソフトバンク株式会社
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Priority to PCT/JP2019/017924 priority Critical patent/WO2020217455A1/fr
Publication of WO2020217455A1 publication Critical patent/WO2020217455A1/fr

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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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a terminal device, a base station device, and a wireless communication method.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • eMBB enhanced Mobile Broad Band
  • URLLC Ultra-Reliable and Low Latency Communication
  • IoT Internet of Things
  • the base station device has adopted beamforming in order to secure the communicable distance and area between the base station device and the terminal device.
  • the base station device transmits beam setting information including beam identification information and the like to the terminal device (process 1).
  • the terminal device receives the beam setting information, it transmits measurement result information such as reception quality of the signal transmitted from the base station device using the beam to the base station device (process 2).
  • the base station device controls the beam (updates the beam setting information) and transmits the updated beam setting information to the terminal device (process S3).
  • the amount of communication between the base station device and the terminal device increases, so that the terminal device performs wireless communication with the base station device. Power consumption may also increase.
  • the amount of communication between the base station device and the IoT device is reduced, and the power consumption when wirelessly communicating with the base station device in the IoT device is performed. Is desired to be reduced.
  • the present invention has been made in view of such circumstances, and by being able to respond to a demand for cost reduction for a terminal device and reducing the amount of communication required for beam control, the base station in the terminal device
  • An object of the present invention is to provide a wireless communication technology capable of reducing power consumption when performing wireless communication with an apparatus.
  • the terminal device is a terminal device that executes wireless communication with the base station device, and is a beam control request that requests control of a beam for transmitting a signal from the base station device to the terminal device. It includes a recording unit that records information and a transmission unit that transmits beam control request information to the base station device after establishing a communication connection with the base station device.
  • the wireless communication method is a wireless communication method used for a terminal device that executes wireless communication with a base station device, and is a beam for transmitting a signal from the base station device to the terminal device. It includes a step of recording information requesting control and a step of transmitting beam control request information to the base station device after establishing a communication connection with the base station device.
  • the base station device is a base station device that executes wireless communication with the terminal device, and is transmitted from the base station device to the terminal device after the communication connection with the terminal device is established.
  • the receiver includes a receiving unit that receives beam control request information that requests control of the beam for transmitting a signal, and a beam control unit that controls the beam based on the beam control request information.
  • the wireless communication method is a wireless communication method used for a base station device that executes wireless communication with a terminal device, and is a base transmitted by the terminal device after establishing a communication connection with the terminal device. It includes a step of receiving beam control request information requesting control of a beam for transmitting a signal from a station device to a terminal device, and a step of controlling a beam based on the beam control request information.
  • the present invention it is possible to respond to a demand for cost reduction for a terminal device, and by reducing the amount of communication required for beam control, the power consumption of the terminal device for wireless communication with the base station device is achieved. Can be reduced.
  • FIG. 1 is a schematic configuration diagram showing an example of a configuration of a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic configuration diagram showing an example of the configuration of the terminal device according to the embodiment of the present invention.
  • FIG. 3 is a schematic configuration diagram showing an example of the configuration of the base station apparatus according to the embodiment of the present invention.
  • FIG. 4 is a flowchart showing an example of the beam control process according to the first embodiment of the present invention.
  • FIG. 5 is a flowchart showing an example of the beam control process according to the second embodiment of the present invention.
  • FIG. 6 is a flowchart showing an example of the beam control process according to the third embodiment of the present invention.
  • the wireless communication system and the wireless network according to the embodiment of the present invention will be described.
  • the wireless communication system according to the embodiment of the present invention targets, but is not limited to, a wireless communication standard related to NR (5G: Fifth Generation).
  • NR Fifth Generation
  • the present invention is also applicable to wireless communication standards related to LTE and LTE-Advanced. It can also be applied to a wireless communication system that uses NR as a part of the wireless communication system.
  • the present invention is applicable to any wireless communication system including at least a terminal device and a base station device, and is also applicable to future wireless communication systems.
  • LTE and LTE-Advanced are also referred to as E-UTRA (Evolved Universal Terrestrial Radio Access), but their meanings are the same.
  • the area (cover area) formed by the base station device is referred to as a cell, and E-UTRA and 5G are cellular communication systems constructed by a plurality of cells.
  • E-UTRA and 5G are cellular communication systems constructed by a plurality of cells.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • FIG. 1 is a schematic configuration diagram showing an example of the configuration of the wireless communication system according to the embodiment of the present invention.
  • the terminal device 1a or the terminal device 1n is wirelessly connected to the base station device 2a or the base station device 2n. Further, each of the terminal device 1a or the terminal device 1n may be wirelessly connected at the same time as the base station device 2a and the base station device 2n.
  • E-UTRA or 5G can be used as the base station apparatus 2 may use 5G and the base station apparatus 2n may use E-UTRA, or vice versa.
  • the base station device in E-UTRA is called eNB (evolved NodeB), and the base station device in NR is called gNB (g-NodeB).
  • the term "base station device” includes both the meanings of eNB and gNB.
  • the terminal device in E-UTRA and NR is called a UE (User Equipment).
  • the base station device gNB in the NR may be connected to the terminal device by using a part of the frequency band (BWP: Carrier bandwidth part) used.
  • BWP Carrier bandwidth part
  • terminal device 1a and the terminal device 1n are shown as n terminal devices 1.
  • some reference numerals are omitted and the term "terminal device 1" is simply referred to.
  • base station device 2a and the base station device 2n are shown as n base station devices 2.
  • base station device 2 when these n base station devices 2 are described without distinction, some reference numerals are omitted and they are simply referred to as "base station device 2".
  • the terminal device 1 may be connected to the base station device 2 in cell units, and may be connected using a plurality of cells (carrier aggregation).
  • the initially connected base station device is the master node (MN: MasterNode)
  • the additionally connected base station device is the secondary node (dual connectivity).
  • SN Secondary Node
  • the base station devices are connected by a base station interface.
  • the base station device 2 and the core device 4 are connected by a core interface.
  • the base station interface is used for exchanging control signals necessary for handover and cooperative operation between base station devices.
  • the core device 4 has, for example, a base station device 2 under its control, and mainly handles load control between base station devices, call (paging) of the terminal device 1, and movement control such as location registration.
  • the terminal device 1 and the base station device 2 send and receive RRC messages in the radio resource control (RRC: Radio Resource Control) layer. Further, the terminal device 1 and the base station device 2 transmit and receive a MAC control element (MAC CE: MAC Control Element) in the medium access control (MAC: Medium Access Control) layer.
  • the RRC message is transmitted as an RRC PDU (Protocol Data Unit), and as the mapped logical channels, a common control channel (CCCH: Common Control Channel), an individual control channel (DCCH: Dedicated Control Channel), and a paging control channel (PCCH:).
  • a Paging Control Channel a Broadcast Control Channel (BCCH: Broadcast Control Channel), or a Multicast Control Channel (MCCH: Multicast Control Channel) is used.
  • the MAC CE is transmitted as a MAC PDU (or MAC SUBPDU).
  • a MAC subPDU is equivalent to a service data unit (SDU: Service Data Unit) in the MAC layer plus, for example, an 8-bit header, and a MAC PDU includes one or more MAC subPDUs.
  • SDU Service Data Unit
  • the physical channels and physical signals related to this embodiment will be described.
  • the physical broadcast channel (PBCH: Physical Broadcast Channel)
  • the physical downlink control channel (PDCCH: Physical Downlink Control Channel)
  • the physical uplink shared channel (PUSCH: Physical Uplink Shared). Channel)
  • a physical random access channel PRACH: Physical Random Access Channel
  • a synchronization signal PrimarySynchronizationSignal, SecondarySynchronizationSignal
  • a physical uplink control channel PUCCH: PhysicalUplinkControl) Channel
  • PDSCH Physical Downlink Shared Channel
  • SRS Scheduling Reference Signal
  • DMRS Demodulation Reference Signal
  • the physical broadcast channel PBCH is transmitted from the base station apparatus to the terminal apparatus and is used to notify common parameters (notification information, system information) in cells under the base station apparatus.
  • System information is further classified into a master information block (MIB) and a system information block (System Information Block, SIB).
  • SIB System Information Block
  • the system information block is further subdivided into SIB1, SIB2, ..., And transmitted.
  • the system information includes information necessary for connecting to the cell.
  • the MIB includes information such as a system frame number and information indicating whether or not to camp in the cell.
  • SIB1 contains parameters for calculating cell quality (cell selection parameters), cell-common channel information (random access control information, PUCCH control information, PUSCH control information), scheduling information for other system information, and the like. include.
  • the physical downlink control channel PDCCH is transmitted from the base station apparatus to notify the terminal apparatus of downlink control information (DCI).
  • the downlink control information includes uplink radio resource information (uplink grant (UL grant)) that can be used by the terminal device, or downlink radio resource information (downlink grant (DL grant)).
  • the downlink grant is information indicating the scheduling of the physical downlink shared channel PDSCH.
  • the uplink grant is information indicating the scheduling of the physical uplink shared channel PUSCH.
  • the PRACH indicated by the PDCCH is a random access response, and includes index information of the random access preamble, transmission timing adjustment information, uplink grant, and the like.
  • the physical uplink shared channel PUSCH is transmitted from the terminal device in order to notify the base station device of the uplink data (user data) and the uplink control data (RRC message).
  • the PUSCH can also include downlink reception quality and physical layer control signals such as ACK / NACK. Further, when the terminal device transmits the PUSCH corresponding to the uplink grant included in the random access response, the PUSCH includes the information (message 3) of the terminal device related to the random access.
  • FIG. 2 is a block diagram illustrating a schematic configuration of the base station device 2 according to the embodiment of the present invention.
  • the base station apparatus 2 includes, for example, an antenna 21, a transmitting unit 22, a receiving unit 23, a recording unit 24, and a control unit 25. Further, the base station apparatus 2 further includes a bus 29 configured to transmit signals and data between the respective parts of the base station apparatus 2.
  • the antenna 21 is configured to be able to radiate (radiate) and receive radio waves (electromagnetic waves) in one or a plurality of predetermined frequency bands.
  • the antenna 21 may be a directional antenna.
  • the gain of the directional antenna 21 differs depending on the orientation of the antenna.
  • the antenna 21 may have no directivity, that is, one having omnidirectionality.
  • the omnidirectional antenna 21 has approximately the same gain from all 360 degrees directions in the horizontal plane, in the vertical plane, or both in the horizontal plane and in the non-horizontal plane and in the vertical plane.
  • the number of antennas 21 included in the base station device 2 is not limited to one.
  • the base station device 2 may include a plurality of antennas. When the base station device 2 includes a plurality of antennas, it may be divided into, for example, a transmitting antenna and a receiving antenna. Further, when a plurality of antennas are divided into a transmitting antenna and a receiving antenna, at least one of them may include a plurality of antennas. When the base station device 2 is provided with a plurality of transmission / reception antennas or transmission antennas, a beamforming technique described later can be used.
  • the transmission unit 22 is connected to the antenna 21.
  • the transmission unit 22 is configured to generate a signal by encoding, modulating, multiplexing, and the like with respect to various information input from the control unit 25, and transmit the signal via the antenna 21.
  • the transmission unit 22 generates a downlink reference signal from information on the communication bandwidth used in the physical downlink specified by the control unit 25, and transmits the downlink reference signal to the terminal device 1 via the antenna 21.
  • the receiving unit 23 is connected to the antenna 21. After establishing the communication connection (RRC connection) with the terminal device 1, the receiving unit 23 receives the beam control request information requesting the control of the beam for transmitting the signal from the base station device 2 to the terminal device 1. ..
  • the receiving unit 23 is configured to restore information by performing separation, demodulation, decoding, etc. of various signals received via the antenna 21, and output the information to the control unit 25. For example, the receiving unit 23 measures the state of the uplink channel from the uplink signal received via the antenna 21, and outputs the information of the measurement result to the control unit 25.
  • the recording unit 24 is configured to record programs, data, and the like.
  • the recording unit 24 includes, for example, a hard disk drive, a solid state drive, and the like.
  • the recording unit 24 records in advance various programs executed by the control unit 25, data necessary for executing the programs, and the like.
  • the recording unit 24 may record beam setting information including beam identification information set at the time of beamforming, which is a control result of the beam control unit 251 described later, for each target terminal device 1.
  • the control unit 25 is configured to control the operation of each unit of the base station device 2, such as the antenna 21, the transmission unit 22, the reception unit 23, and the recording unit 24. Further, the control unit 25 is configured to realize each function described later by executing a program recorded in the recording unit 24 or the like.
  • the control unit 25 is, for example, a processor such as a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), a memory such as a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. And a buffer recording device such as a buffer.
  • the control unit 25 functionally includes, for example, a beam control unit 251 that controls the beam.
  • the beam control unit 251 controls the beam based on the beam control request information transmitted from the terminal device 1.
  • Beam control includes, but is not limited to, reducing the beam control frequency, for example. For example, it may include increasing the beam control frequency within a range in which the amount of wireless communication between the terminal device 1 and the base station device 2 does not increase significantly.
  • the control of the beam may include controlling the signal intensity by, for example, controlling the amplitude and phase.
  • the beam sweeping executed by the beam control unit 251 will be described.
  • the base station apparatus 2 employs beamforming in order to secure the communicable distance and area between the base station apparatus 2 and the terminal apparatus 1.
  • Beamforming is a technique for forming a directional pattern or a directional beam by controlling the amplitude and phase of each of a plurality of antennas 21 to increase or decrease the gain of the antenna in a specific direction.
  • Beamforming it is possible to concentrate the signal strength of the transmission signal (transmission beam) in a specific direction and extend the communication distance.
  • the signal strength is lowered in a direction other than the specific direction, the reachable range of the transmitted signal is narrowed.
  • NR supports beam sweeping in which the directions of transmission signals are sequentially switched and a plurality of transmission signals (transmission beams) are transmitted.
  • the base station device 2 is not limited in the number of directions in which the beam is switched, but for example, the base station device 2 switches in eight directions to transmit a transmission signal.
  • Each function of the control unit 25 can be realized by a program executed by a computer (microprocessor). Therefore, each function included in the control unit 40 can be realized by hardware, software, or a combination of hardware and software, and is not limited to any case. Further, when each function of the control unit 25 is realized by software or a combination of hardware and software, the processing can be executed by multitasking, multithreading, or both multitasking and multithreading. It is not limited to such a case.
  • FIG. 3 is a block diagram illustrating a schematic configuration of the terminal device 1 according to the embodiment of the present invention.
  • the terminal device 1 includes, for example, an antenna 11, a transmitting unit 12, a receiving unit 13, a recording unit 14, a control unit 15, and a sensor 17. Further, the terminal device 1 further includes a bus 19 configured to transmit signals and data between each part of the terminal device 1.
  • the antenna 11 is configured to be able to radiate (radiate) and receive radio waves (electromagnetic waves) in one or a plurality of predetermined frequency bands.
  • the antenna 11 may be non-directional, that is, omnidirectional.
  • the omnidirectional antenna 11 has approximately the same gain from all 360 degrees directions in the horizontal plane, in the vertical plane, or both in the horizontal plane and in the vertical plane.
  • the antenna 11 may be an antenna having directivity. The gain of the directional antenna 11 differs depending on the orientation of the antenna.
  • the number of antennas 11 included in the terminal device 1 is not limited to one.
  • the terminal device 1 may include a plurality of antennas. When the terminal device 1 includes a plurality of antennas, it may be divided into, for example, a transmitting antenna and a receiving antenna. Further, when a plurality of antennas are divided into a transmitting antenna and a receiving antenna, at least one of them may include a plurality of antennas.
  • the transmitting unit 12 is connected to the antenna 11. After establishing a communication connection (RRC connection) with the base station device 2, the transmission unit 12 transmits beam control request information requesting control of the beam for transmitting a signal from the base station device 2 to the terminal device 1. To do. The details of the beam control request information will be described later.
  • the transmission unit 12 spontaneously transmits the beam control request information as the spontaneous transmission information to the base station device 2.
  • “Spontaneously ... transmitting” includes executing a transmission process regardless of a request or command from another device.
  • “Spontaneously ... transmitting” means at least the conventional transmission processing, for example, the processing of transmitting the measurement result of the communication status based on the information such as the beam setting information transmitted from the base station device 2. Not included.
  • the spontaneous transmission information may be transmitted spontaneously, and may be at the timing when the terminal device 1 is started, or at the timing when the terminal device 1 is temporarily stopped and restarted.
  • “Spontaneously ... transmitting” includes a case where a signal is transmitted regardless of a request or a command from the base station apparatus 2 even after the beamforming is once started.
  • the transmission unit 12 generates a signal by, for example, encoding, modulating, multiplexing, etc. various information input from the control unit 15 or the recording unit 14, and transmits the signal via the antenna 11. It is configured in. For example, the transmission unit 12 generates a physical uplink signal from the information regarding the communication bandwidth used in the physical uplink specified by the control unit 15 and transmits it to the base station apparatus 2 via the antenna 11.
  • the receiving unit 13 is connected to the antenna 11.
  • the receiving unit 13 is configured to restore information by performing separation, demodulation, decoding, etc. of various signals received via the antenna 11, and output the information to the control unit 15.
  • the recording unit 14 is configured to record programs, data, and the like.
  • the recording unit 14 records information regarding beam control for transmitting a signal from the base station device 2 to the terminal device 1.
  • the recording unit 14 records the cell ID of the base station apparatus 1.
  • the cell ID of the base station device 2 includes, for example, a cell ID acquired when the terminal device 1 makes an RRC connection with a specific base station device.
  • the recording unit 14 includes, for example, a hard disk drive, a solid state drive, and the like.
  • the recording unit 14 records in advance various programs executed by the control unit 15, data necessary for executing the programs, and the like.
  • the sensor 17 includes a sensor that detects the position, direction, and acceleration of the terminal device 1.
  • the sensor includes, for example, at least one sensor such as a GPS (Global Positioning System) sensor, a gyro sensor, and an acceleration sensor.
  • the sensor 17 outputs the detected information to the control unit 15.
  • the control unit 15 is configured to control the operation of each unit of the terminal device 1, such as the antenna 11, the transmission unit 12, the reception unit 13, the recording unit 14, and the sensor 17. Further, the control unit 15 is configured to realize each function described later by executing a program recorded in the recording unit 14 or the like.
  • the control unit 15 includes, for example, a CPU, a processor such as an ASIC and an FPGA, a memory such as a ROM and a RAM, and a buffer recording device such as a buffer.
  • the control unit 15 functionally includes, for example, a number measurement unit 151, a switching frequency measurement unit 153, a movement status measurement unit 155, a communication frequency measurement unit 157, and a reception status measurement unit 159.
  • the number measurement unit 151 measures the number of times a signal transmitted from the base station device 2 using a beam is received in a predetermined period, and outputs it as reception number information.
  • the predetermined period may be set in seconds, minutes or hours, or in larger units such as days.
  • the number of receptions includes the number of times the signal is actually received.
  • the number measurement unit 151 may measure the number of times a signal having a strength exceeding the threshold value is received as the number of receptions.
  • the threshold value may be preset in the terminal device 1 or may be acquired in advance as broadcast information from the base station device 2. Only one threshold value may be set, or a plurality of threshold values may be set.
  • the switching frequency measuring unit 153 measures the switching frequency of the beam in a predetermined period and outputs it as switching frequency information.
  • the predetermined period may be set in seconds, minutes or hours, or in larger units such as days.
  • the frequency of beam switching may be the number of times the beam is actually switched.
  • the frequency of beam switching may be measured based on how much the beam of maximum intensity has switched, or may be measured based on how much the beam transmitting a signal having an intensity exceeding a predetermined threshold has switched. ..
  • the threshold value may be preset in the terminal device 1 or may be acquired in advance as broadcast information from the base station device 2. Only one threshold value may be set, or a plurality of threshold values may be set.
  • the switching frequency information may be information indicating the presence or absence of beam switching (binary value), or information indicating the beam switching frequency with three or more values such as "large”, "medium", and "small". It may be.
  • the movement status measurement unit 155 measures the movement status of the terminal device 1. For example, the movement status measurement unit 155 acquires the detection information of the sensor 17 shown in FIG. 3, measures the movement status of the terminal device 1, and outputs it as the movement status information.
  • the movement status information may be information indicating the presence / absence (binary value) of movement of the terminal device 1.
  • the movement status information may be, for example, information including the movement speed information of the terminal device 1 and indicating the movement speed of the terminal device 1 as three or more values such as "high speed”, "medium speed", and "low speed”. However, it may be information such as the actual moving speed (m / s) of the terminal device 1.
  • the movement status measuring unit 155 acquires the switching frequency information output by the switching frequency measuring unit 153, and measures the presence / absence of movement of the terminal device 1 or the moving speed of the terminal device 1 based on the acquired switching frequency information. You may.
  • the communication frequency measuring unit 157 measures the beam control frequency that the terminal device 1 can handle.
  • the communication frequency measuring unit 157 measures the beam control frequency that the terminal device 1 can handle, for example, based on the beam control capability of the terminal device 1.
  • the communication frequency measuring unit 157 measures, for example, whether the terminal device 1 can support beam control one or more times, or whether the terminal device 1 does not support beam control.
  • the control of the beam includes, for example, the following processes 1 to 3.
  • the base station apparatus 2 transmits beam setting information including beam identification information and the like set at the time of beamforming to the terminal apparatus 1 (process 1).
  • the terminal device 1 When the terminal device 1 receives the beam setting information, it transmits measurement result information such as reception quality of the signal transmitted from the base station device 2 using the beam to the base station device 2 (process 2).
  • the base station device 2 controls the beam (updates the beam setting information) and transmits the updated beam setting information to the terminal device (process 3).
  • the communication frequency measuring unit 157 executes the beam control once when the terminal device 1 can execute the above process 2 once. Judge as possible.
  • the communication frequency measuring unit 157 controls the beam when the terminal device 1 cannot execute the above process 2 even once (for example, when the terminal device 1 does not have a function of measuring the communication status). Judge that it is impossible to execute.
  • the reception status measurement unit 159 measures the reception status of the signal transmitted by the base station device 2 using the beam at one or more antennas 11 of the terminal device 1.
  • the reception status measurement unit 159 measures the reception status of the signal based on a predetermined physical quantity, for example, the level of the received signal level (reception intensity).
  • the received signal level refer to at least one of RSRP (R eference S ignal R eceived P ower) and RSSI (R eceived S ignal S trength I ndicator).
  • RSRP is a basic parameter for evaluating the received signal level of radio waves from a base station.
  • RSRP is measured based on the beamforming situation of the base station apparatus 2.
  • RSRP determines the installation conditions of the base station device 2, including the transmission power of the base station device 2, the direction and height of the antenna of the base station device 2, the distance from the base station device 2, the presence or absence of obstacles, and the like. Determined based on the measurement environment involved.
  • RSSI is a basic parameter for evaluating the received signal level of radio waves from the base station device 2.
  • RSSI is a parameter that can change not only depending on the installation conditions and measurement environment of the base station apparatus 2, but also on the traffic volume of the base station to be measured and the peripheral base stations.
  • Reception state measuring unit 159 a physical quantity further determine the reception conditions, with additional reference to at least one of RSRQ (R eference S ignal R eceived Q uality) and SINR (S ignal to I nterference plus N oise power R atio) , The signal reception status may be determined.
  • RSRQ is one of the indexes showing the reception quality of radio waves from the base station, and is a parameter calculated by the ratio of RSRP and RSSI.
  • SINR is a parameter indicating the received signal power to interference and noise power ratio in consideration of interference from surrounding base stations and other relay devices.
  • the reception status measurement unit 159 includes, for example, beam control capability information indicating that the beam is not capable of controlling the beam, that is, when the terminal device 1 does not have the ability to control the beam.
  • the terminal device 1 does not have to include the reception status measuring unit 159.
  • Each function of the control unit 15 can be realized by a program executed by a computer (microprocessor). Therefore, each function included in the control unit 15 can be realized by hardware, software, or a combination of hardware and software, and is not limited to any case.
  • the processing can be executed by multitasking, multithreading, or both multitasking and multithreading, and any of them can be executed. It is not limited to the case.
  • FIG. 4 is a flowchart showing an example of the beam control process according to the first embodiment of the present invention. As shown in FIG. 4, an RRC connection is established between the terminal device 1 and the base station device 2 (step S1).
  • the recording unit 14 of the terminal device 1 shown in FIG. 3 records the beam control capability information regarding the beam control capability of the terminal device 1 in advance (step S3).
  • the beam control capability information may be recorded in the recording unit 14 by input from the user of the terminal device 1, or may be recorded in the recording unit 14 by the terminal device 1 determining its own capability.
  • step S3 is described as being executed after step S1, but may be executed before step S1.
  • the beam control capability information is, for example, when the terminal device 1 cannot execute the above process 2 even once as described above (for example, when the terminal device 1 does not have a function of measuring the communication status), the terminal The device 1 contains information indicating that there is no beam control capability.
  • the beam control capability information includes information indicating that the terminal device 1 has beam control capability when the beam control can be executed one or more times.
  • the beam control capability information may be information indicating the presence / absence (binary value) of the beam control capability, and the height of the beam control capability is three or more values such as "high”, “medium”, and "low”. It may be the information indicated by.
  • the terminal device 1 spontaneously transmits beam control request information including beam control capability information to the base station device 2 (step S5).
  • the base station device 2 executes beam control (step S7).
  • the base station apparatus 2 transmits beam setting information to the terminal apparatus 1 using the controlled beam (step S9).
  • the base station device 2 reduces the frequency of beam control when the terminal device 1 determines that the beam control capability is low based on the beam control request information.
  • the base station apparatus 2 may be configured so that, for example, the beam can be controlled only once.
  • the terminal device 1 receives the beam setting information, it transmits measurement result information such as reception quality of the signal transmitted from the base station device 2 using the beam to the base station device 2 (step S11).
  • the base station device 2 When the base station device 2 receives the measurement result information from the terminal device 1, it controls the beam and transmits the updated beam setting information to the terminal device (step S13). As described above, since beam control is not allowed thereafter, transmission of a signal using the most recently formed beam is continued.
  • the number of times of game control is not particularly limited, and may be two or more as long as it does not cause an increase in communication volume.
  • step S7 if the base station device 2 determines that the terminal device 1 does not have the beam control capability based on the beam control request information, the base station device 2 does not execute the beam control thereafter. That is, the processes of steps S11 and S13 described above are not executed. In this way, the base station device 2 controls so as to reduce the number or frequency of beam control based on the beam control request information from the terminal device 1.
  • the base station device 2 transmits the beam setting information to the terminal device 1 (process 1).
  • the terminal device 1 receives the beam setting information, it transmits measurement result information such as reception quality of the signal transmitted from the base station device 2 using the beam to the base station device 2 (process 2).
  • the base station device 2 controls the beam (updates the beam setting information) and transmits the updated beam setting information to the terminal device 1 (process 3).
  • the optimum beam for communication between the base station device and the terminal device is formed by repeating the cycles of the above processes 1 to 3 many times.
  • the cycles of the above processes 1 to 3 for beam control are repeated many times, the amount of communication between the base station device 2 and the terminal device 1 increases, so that the terminal device 1 and the base station device 2 Power consumption during wireless communication may also increase. Further, in the terminal device 1 for which there is a request for cost reduction, the amount of communication between the base station device 2 and the terminal device 1 is reduced, and the power consumption when the terminal device 1 performs wireless communication with the base station device 2 is reduced. It is desired to let.
  • the terminal device 1 voluntarily sends beam control request information from the terminal device 1 to the base station device 2 regardless of a request or command from another device such as the base station device 2.
  • the base station device 2 controls the beam based on the received beam control request information. Therefore, it is not necessary to repeat the conventional cycles of steps 1 to 3 as described above. Therefore, it is possible to meet the demand for cost reduction for the terminal device 1, and by reducing the amount of communication required for beam control, the power consumption of the terminal device 1 when performing wireless communication with the base station device 2 can be reduced. It can be reduced.
  • the second embodiment is a terminal device in that the terminal device 1 voluntarily measures the number of times a beam is received, the frequency of beam switching, and the like, and voluntarily transmits beam control request information based on the measurement results to the base station device 2.
  • This is different from the first embodiment in which the information regarding the beam control recorded in advance in 1 is spontaneously transmitted to the base station apparatus 2.
  • Embodiments 2-1 to 2-4 will be described with reference to FIG. Hereinafter, the points different from the first embodiment will be particularly described.
  • FIG. 5 is a flowchart showing an example of the beam control process according to the second embodiment of the present invention.
  • the terminal device 1 measures information regarding beam control (step S23).
  • the number measurement unit 151 shown in FIG. 3 measures the number of times a signal transmitted from the base station device 2 using a beam is received in a predetermined period.
  • the terminal device 1 records the measurement result as reception number information in the recording unit 14 (step S25).
  • the terminal device 1 spontaneously transmits the beam control request information including the reception number information to the base station device 2 (step S27).
  • the base station apparatus 2 executes beam control based on the received beam control request information (step S29).
  • the base station device 2 determines that the necessity of beam control is low, and reduces the frequency of beam control. Further, when the number of times the terminal device 1 receives the signal in a predetermined period is small, the base station device 2 may determine that the need for beam control is high and increase the frequency of beam control. When increasing the beam control frequency, it is necessary to limit the amount of wireless communication between the terminal device 1 and the base station device 2 to a range that does not significantly increase.
  • the switching frequency measuring unit 153 shown in FIG. 3 measures the switching frequency of the beam in a predetermined period (step S23).
  • the terminal device 1 records the measurement result as switching frequency information in the recording unit 14 (step S25).
  • the terminal device 1 spontaneously transmits beam control request information including switching frequency information to the base station device 2 (step S27).
  • the base station apparatus 2 executes beam control based on the received beam control request information (step S29). For example, when the switching frequency of the beam in a predetermined period is low, the base station apparatus 2 determines that the necessity of controlling the beam is low, and reduces the frequency of beam control.
  • the base station apparatus 2 may determine that the necessity of controlling the beam is high and increase the frequency of beam control.
  • the movement status measurement unit 155 shown in FIG. 3 measures the movement status of the terminal device 1 (step S23).
  • the terminal device 1 records the measurement result as movement status information in the recording unit 14 (step S25).
  • the terminal device 1 spontaneously transmits the beam control request information including the movement status information to the base station device 2 (step S27).
  • the base station apparatus 2 executes beam control based on the received beam control request information (step S29). For example, when the terminal device 1 is stationary or hardly moving, the base station device 2 determines that the need for beam control is low, and reduces the frequency of beam control. Further, when the terminal device 1 is frequently moving, the base station device 2 may determine that the need for beam control is high and increase the frequency of beam control. When increasing the beam control frequency, it is necessary to limit the amount of wireless communication between the terminal device 1 and the base station device 2 to a range that does not significantly increase.
  • the communication frequency measuring unit 157 shown in FIG. 3 measures the beam control frequency that the terminal device 1 can handle (step S23).
  • the terminal device 1 records the measurement result in the recording unit 14 (step S25).
  • the terminal device 1 spontaneously transmits the request information for requesting the base station device 2 regarding the control frequency of the beam to the base station device 2 (step S27).
  • the base station apparatus 2 executes beam control based on the received request information (step S29). For example, when the beam control frequency that the terminal device 1 can handle is low, the base station device 2 reduces the beam control frequency. Further, when the beam control frequency that the terminal device 1 can handle is high, the base station device 2 may increase the beam control frequency. When increasing the beam control frequency, it is necessary to limit the amount of wireless communication between the terminal device 1 and the base station device 2 to a range that does not significantly increase.
  • the terminal device 1 spontaneously measures the number of beam receptions, the beam switching frequency, and the like, and spontaneously transmits the spontaneous transmission information based on the measurement results to the base station device 2. Therefore, in the second embodiment, in addition to the effect of the first embodiment, a request regarding beam control can be voluntarily made to the base station device 2 based on the measurement result spontaneously measured by the terminal device 1. ..
  • the terminal device 1 spontaneously transmits the beam control request information to the base station device 2 in that the terminal device 1 transmits the beam control request information to the base station device 2 based on the request signal from the base station device 2. It is different from the first embodiment and the second embodiment that are transmitted to the base station apparatus 2. The third embodiment will be described with reference to FIG. Hereinafter, the points different from those of the first embodiment and the second embodiment will be particularly described.
  • the base station device 2 transmits a request signal for requesting transmission of beam control request information to the terminal device 1 (step S45).
  • the terminal device 1 transmits beam control request information to the base station device 2 based on the request signal from the base station device 2 (step S47).
  • the beam control request information relates to the beam control capability information described in the first embodiment, the reception frequency information, the switching frequency information, the movement status information, and the beam control frequency described in the second embodiment. At least one of the request information for requesting the base station device 2 may be included.
  • the base station device 2 executes beam control (step S49). The beam control process is executed based on various information included in the beam control request information.
  • the terminal device 1 transmits beam control request information to the base station device 2 based on the request signal from the base station device 2. That is, the terminal device 1 issues a request to the base station device 2 regarding the control content of the beam. Therefore, since the base station device 2 can appropriately control the beam in response to the request from the terminal device 1, it is not necessary to repeat the conventional cycles of steps 1 to 3 many times. Therefore, it is possible to meet the demand for cost reduction for the terminal device 1, and by reducing the amount of communication required for beam control, the power consumption of the terminal device 1 when performing wireless communication with the base station device 2 can be reduced. It can be reduced.
  • Terminal device 1 ... Terminal device, 2 ... Base station device, 4 ... Core device, 11,21 ... Antenna, 12, 22 ... Transmitter, 13, 23 ... Receiver, 14, 24 ... Recording, 15, 25 ... Control, 17 ... Sensor, 19, 29 ... Bus, 151 ... Number measurement unit, 153 ... Switching frequency measurement unit, 155 ... Movement status measurement unit, 157 ... Communication frequency measurement unit, 159 ... Reception status measurement unit, 251 ... Beam control unit

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

Abstract

La présente invention concerne un dispositif terminal (1) qui effectue une communication sans fil avec un dispositif de station de base (2). Le dispositif terminal (1) comporte : une unité d'enregistrement (14) qui enregistre des informations de demande de commande de faisceau pour demander la commande d'un faisceau pour transmettre un signal en provenance du dispositif de station de base (2) au dispositif de terminal (1); et une unité de transmission (12) qui transmet les informations de demande de commande de faisceau au dispositif de station de base (2) après l'établissement d'une connexion de communication avec le dispositif de station de base (2). Ceci permet de répondre à une demande de réduction de coût par rapport au dispositif terminal (1), et permet également de réduire une quantité de communication requise pour la commande de faisceau, ce qui permet de réduire la consommation d'énergie du dispositif terminal (1) lors de la réalisation de la communication sans fil avec le dispositif de station de base (2).
PCT/JP2019/017924 2019-04-26 2019-04-26 Dispositif terminal, dispositif de station de base, et procédé de communication sans fil WO2020217455A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130229307A1 (en) * 2012-03-02 2013-09-05 Samsung Electronics Co. Ltd. Apparatus and method for controlling adaptive beamforming gain in wireless communication system
US20160353510A1 (en) * 2015-02-13 2016-12-01 Mediatek Singapore Pte. Ltd. Handling of Intermittent Disconnection in A Millimeter Wave (MMW) System
JP2018157284A (ja) * 2017-03-15 2018-10-04 シャープ株式会社 通信システム、基地局装置、通信方法、及びプログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130229307A1 (en) * 2012-03-02 2013-09-05 Samsung Electronics Co. Ltd. Apparatus and method for controlling adaptive beamforming gain in wireless communication system
US20160353510A1 (en) * 2015-02-13 2016-12-01 Mediatek Singapore Pte. Ltd. Handling of Intermittent Disconnection in A Millimeter Wave (MMW) System
JP2018157284A (ja) * 2017-03-15 2018-10-04 シャープ株式会社 通信システム、基地局装置、通信方法、及びプログラム

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