WO2021241507A1 - Station de base, procédé de commande de station de base et système de communication cellulaire - Google Patents

Station de base, procédé de commande de station de base et système de communication cellulaire Download PDF

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Publication number
WO2021241507A1
WO2021241507A1 PCT/JP2021/019637 JP2021019637W WO2021241507A1 WO 2021241507 A1 WO2021241507 A1 WO 2021241507A1 JP 2021019637 W JP2021019637 W JP 2021019637W WO 2021241507 A1 WO2021241507 A1 WO 2021241507A1
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WO
WIPO (PCT)
Prior art keywords
wireless terminal
frequency band
band
base station
control unit
Prior art date
Application number
PCT/JP2021/019637
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English (en)
Japanese (ja)
Inventor
雅浩 八木
誠 戸水
Original Assignee
京セラ株式会社
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Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to JP2022527038A priority Critical patent/JP7450030B2/ja
Publication of WO2021241507A1 publication Critical patent/WO2021241507A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to a base station, a base station control method, and a cellular communication system.
  • Non-Patent Document 1 describes a technique for constructing a small-scale non-public cellular network (NPN: Non-Public Network) that can be used by a specific subscriber in a 5th generation (5G) cellular communication system. ..
  • NPN Non-Public Network
  • 5G 5th generation
  • Such a non-public cellular network is sometimes called local 5G, and is expected to be used for self-employed wireless communication in business establishments or factories.
  • the base station is a base station used in a cellular communication system, and when a connection with the wireless terminal is established in response to a connection request from the wireless terminal, the base station is based on information about the wireless terminal.
  • a control unit for selecting a frequency band to be used by the wireless terminal from a licensed band and an unlicensed band is provided. When the frequency band in use by the wireless terminal is different from the selected frequency band, the control unit performs handover of the wireless terminal to the selected frequency band.
  • the base station control method is a base station control method used in a cellular communication system, and when a connection with the wireless terminal is established in response to a connection request from the wireless terminal, the wireless terminal
  • the frequency band to be used by the wireless terminal is selected from the licensed band and the unlicensed band based on the information regarding the above, and when the frequency band used by the wireless terminal is different from the selected frequency band, the selection is made. It has the function of performing the handover of the wireless terminal with respect to the frequency band.
  • the cellular communication system licenses a frequency band to be used by the wireless terminal based on information about the wireless terminal when a connection with the wireless terminal is established in response to a connection request from the wireless terminal. It is equipped with a base station to choose from between bands and unlicensed bands. When the frequency band in use by the wireless terminal is different from the selected frequency band, the base station performs handover of the wireless terminal to the selected frequency band.
  • the frequency bands that can be used locally in 5G are the 28GHz band and the 4.5GHz band. Further, these two frequency bands belong to a licensed band that requires a license, but a 1.9 GHz band that belongs to a non-licensed band that does not require a license may also be used locally in 5G. Since these frequency bands have different characteristics, it is desired to use an appropriate frequency band for the wireless terminal to improve the frequency utilization efficiency.
  • the purpose of this disclosure is to make it possible to improve the frequency utilization efficiency.
  • the cellular communication system is a 5G system of 3GPP (Third Generation Partnership Project), which is a cellular communication standard, but even if LTE (Long Term Evolution) is applied to the cellular communication system at least partially. good.
  • 3GPP Third Generation Partnership Project
  • FIG. 1 is a diagram showing a configuration of a cellular communication system according to an embodiment.
  • the cellular communication system includes a radio terminal (UE: User Equipment) 100, a 5G radio access network (NG-RAN: Next Generation Radio Access Network) 10, and a 5G core. It has a network (5GC: 5G Core Network) 20.
  • UE User Equipment
  • NG-RAN Next Generation Radio Access Network
  • 5G Core Network 5G Core Network
  • the UE 100 is a movable device.
  • the UE 100 may be any device as long as it is a device used by the user.
  • the UE 100 is a mobile phone terminal (including a smartphone), a tablet terminal, a notebook PC, a communication module (including a communication card or a chipset), and / or a sensor or a device provided in the sensor.
  • the NG-RAN 10 includes a base station (called “gNB” in a 5G system) 200.
  • the gNB 200 are connected to each other via the Xn interface, which is an interface between base stations.
  • the gNB 200 manages one or more cells.
  • the gNB 200 performs wireless communication with the UE 100 that has established a connection with its own cell.
  • the gNB 200 has a radio resource management (RRM) function, a routing function for user data (hereinafter, simply referred to as “data”), a measurement control function for mobility control / scheduling, and the like.
  • RRM radio resource management
  • Cell is used as a term to indicate the smallest unit of wireless communication area.
  • the term “cell” is also used to indicate a function or resource for wireless communication with the UE 100.
  • One cell belongs to one carrier frequency.
  • This carrier frequency may be a carrier frequency belonging to a high frequency band such as a sub 6 band or a millimeter wave band.
  • 5GC20 includes AMF (Access and Mobility Management Function) and UPF (User Plane Function) 300.
  • the AMF performs various mobility controls and the like for the UE 100.
  • the AMF manages information on the area in which the UE 100 is located by communicating with the UE 100 using NAS (Non-Access Stratum) signaling.
  • UPF controls data transfer.
  • the AMF and UPF are connected to the gNB 200 via the NG interface, which is an interface between the base station and the core network.
  • the gNB 200 constitutes a local 5G network which is a non-public cellular network.
  • a local 5G network is a small network available to a particular subscriber.
  • a public cellular network (PLMN: Public Land Mobile Network), which is a general cellular network, is operated by a telecommunications carrier. For example, a nationwide license is issued to a telecommunications carrier that operates a PLMN.
  • the local 5G network can be flexibly constructed and used by various actors according to the needs of the region and the individual needs of the industrial field. For example, a general company, an organization, or an individual can operate a local 5G network by receiving a frequency allocation.
  • the local 5G network may be licensed only in the local area such as in the facility of a general company.
  • FIG. 2 is a diagram showing a configuration of a protocol stack of a wireless interface of a user plane that handles data.
  • the wireless interface protocol of the user plane includes a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, and the like. It has an SDAP (Service Data Adjustment Protocol) layer.
  • PHY physical
  • MAC Medium Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • SDAP Service Data Adjustment Protocol
  • the PHY layer performs coding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the gNB 200 via a physical channel.
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), random access procedure, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the gNB 200 via the transport channel.
  • the MAC layer of gNB200 includes a scheduler. The scheduler determines the transport format (transport block size, modulation / coding method (MCS)) of the upper and lower links and the resource block allocated to the UE 100.
  • MCS modulation / coding method
  • the RLC layer transmits data to the RLC layer on the receiving side by utilizing the functions of the MAC layer and the PHY layer. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the gNB 200 via a logical channel.
  • the PDCP layer performs header compression / decompression and encryption / decryption.
  • the SDAP layer maps the IP flow, which is a unit for performing QoS control by the core network, with the wireless bearer, which is a unit for performing QoS control by AS (Access Stratum).
  • FIG. 3 is a diagram showing a configuration of a protocol stack of a wireless interface of a control plane that handles signaling (control signal).
  • the protocol stack of the radio interface of the control plane has an RRC (Radio Resource Control) layer and a NAS (Non-Access Stratum) layer in place of the SDAP layer shown in FIG.
  • RRC Radio Resource Control
  • NAS Non-Access Stratum
  • RRC signaling for various settings is transmitted between the RRC layer of the UE 100 and the RRC layer of the gNB 200.
  • the RRC layer controls logical channels, transport channels, and physical channels in response to the establishment, re-establishment, and release of radio bearers.
  • RRC connection connection between the RRC of the UE 100 and the RRC of the gNB 200
  • the UE 100 is in the RRC connected state.
  • RRC connection connection
  • the NAS layer located above the RRC layer performs session management, mobility management, etc.
  • NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the AMF300.
  • the UE 100 has an application layer and the like in addition to the wireless interface protocol.
  • FIG. 4 is a diagram showing an operating environment of the cellular communication system according to the embodiment.
  • each gNB200 manages a cell.
  • the gNB200A manages the cell 10A of the frequency band F1 belonging to the license band.
  • the cell 10A is a macro cell
  • the cell 10A may be a small cell.
  • the frequency band F1 is a 4.5 GHz band.
  • the gNB 200B manages the cell 10A of the frequency band F2 belonging to the unlicensed band.
  • the gNB 200B constitutes a local 5G network, and the cell 10B is a small cell.
  • the unlicensed band is a frequency band that does not require a license and is a frequency band shared by a plurality of wireless communication systems having different communication methods.
  • the frequency band F2 is a 1.9 GHz band.
  • the gNB200C manages the cell 10C of the frequency band F3 belonging to the license band.
  • the gNB 200C constitutes a local 5G network, and the cell 10C is a small cell.
  • the frequency band F3 is a 28 GHz band.
  • Each of the gNBs 200A to 200C may be connected to the core network 5GC20 and communicate between the gNBs 200 via the 5GC20.
  • Each of the gNBs 200A to 200C may be connected to each other via the Xn interface, which is an interface between the gNBs 200, and may communicate between the gNBs 200 via the Xn interface.
  • FIG. 4 shows an example in which cells 10A to 10C are managed by different gNB200s, two or more cells out of cells 10A to 10C may be managed by one gNB200.
  • the UE 100 is located in an area where cells 10A to 10C overlap.
  • the UE 100 is a UE (member UE) that can use the local 5G network.
  • the UE 100 connects to the gNB 200, that is, when transitioning from the RRC idle state or the RRC inactive state to the RRC connected state, any cell of cells 10A to 10C (for example, the cell having the best wireless state) is used.
  • a connection request is made to the gNB 200 that selects and manages the selected cell.
  • the frequency band F1 (cell 10A) and the frequency band F3 (cell 10C) belonging to the licensed band have a smaller communication delay and a higher security level than the frequency band F2 (cell 10B) belonging to the non-licensed band.
  • the non-licensed band interference between systems is likely to occur, and availability confirmation by carrier sense may be required before communication, so that the communication delay may be larger than that in the licensed band.
  • the security level of the unlicensed band is lower than that of the licensed band because the devices of other systems can intercept the communication.
  • the frequency band F1 (cell 10A) used for the macro cell is capable of high-speed communication as compared with the frequency band F3 (cell 10C) used for the small cell. Since the number of UEs accommodated by the small cell is small, the amount of radio resources available per UE is large, and a higher communication rate can be exhibited as compared with the macro cell accommodating many UEs.
  • the UE 100 selects the connection destination cell in consideration of only the wireless state (for example, the reference signal reception power of the cell). Therefore, the UE 100 cannot select an appropriate cell according to the usage scene, and the frequency utilization efficiency may be low.
  • FIG. 5 is a diagram showing the configuration of gNB 200 according to one embodiment.
  • the gNB 200 includes a transmission unit 210, a reception unit 220, a control unit 230, and a backhaul communication unit 240.
  • the transmission unit 210 performs various transmissions under the control of the control unit 230.
  • the transmitter 210 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output by the control unit 230 into a downlink radio signal and transmits it from the antenna.
  • the receiving unit 220 performs various receptions under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts the uplink radio signal received by the antenna into a baseband signal (received signal) and outputs the signal to the control unit 230.
  • the control unit 230 performs various controls on the gNB 200.
  • the control unit 230 includes at least one processor and at least one memory electrically connected to the processor.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor may include a baseband processor and a CPU.
  • the baseband processor modulates / demodulates and encodes / decodes the baseband signal.
  • the CPU executes a program stored in the memory to perform various processes.
  • the backhaul communication unit 240 is connected to the AMF / UPF 300 via the interface between the base station and the core network.
  • the backhaul communication unit 240 is connected to an adjacent base station via an interface between base stations.
  • the gNB 200 is composed of a CU (Central Unit) and a DU (Distributed Unit) (that is, the functions are divided), and both units may be connected by an F1 interface.
  • the receiving unit 220 receives the connection request from the UE 200.
  • the connection request is a random access preamble.
  • the connection request may be a message of the RRC layer, for example, an RRC setup request message transmitted by the UE 100 in the RRC idle state, or an RRC resume request message transmitted by the UE 100 in the RRC inactive state.
  • the control unit 230 establishes a connection with the UE 100 in response to a connection request from the UE 100.
  • Establishing a connection means setting up an RRC connection or resuming an RRC connection.
  • the control unit 230 When the control unit 230 establishes a connection with the UE 100 in response to a connection request from the UE 100, the control unit 230 sets the frequency band to be used by the UE 100 as a license band and a non-licensed band based on the information about the UE 100 (hereinafter referred to as “UE-related information”). Select from the license band.
  • the control unit 230 performs a handover of the UE 100 to the selected frequency band. Specifically, the control unit 230 transmits a handover command instructing the handover to the cell of the selected frequency band to the UE 100.
  • UE-related information the information about the UE 100
  • the UE-related information used for selecting the frequency band may be included in the connection request or data received from the UE 100 by the receiving unit 220.
  • the UE-related information used for selecting the frequency band may be received by the backhaul communication unit 240 from the core network (5GC20).
  • the core network 5GC20
  • the gNB 200 can easily acquire the information of the application layer from the core network.
  • the control unit 230 selects a frequency band to be used by the UE 100 from a licensed band and an unlicensed band based on the type or characteristic of the communication executed by the UE 100.
  • the communication type may be the type of the communication application executed by the UE 100 or the type of the communication service corresponding to the network slice.
  • the communication characteristic may be a required Quality of Service (QoS) characteristic or a characteristic determined according to the content of the communication data.
  • QoS Quality of Service
  • the control unit 230 may select a license band as the frequency band to be used by the UE 100. Choosing an unlicensed band for emergency calls can result in unacceptable delays, so we choose a licensed band for emergency calls.
  • the control unit 230 may select an unlicensed band as the frequency band to be used by the UE 100.
  • Communication that does not require real-time performance means a case where the UE 100 periodically transmits sensor data, or a case where the UE 100 performs file transfer by FTP (File Transfer Protocol).
  • the control unit 230 selects a frequency band to be used by the UE 100 from a licensed band and an unlicensed band based on the security level required for the data communicated by the UE 100.
  • the security level may be specified by the control unit 230 analyzing the contents of the data communicated by the UE 100, or the security level may be specified by analyzing the contents of the data communicated by the UE 100 on the core network side. .. For example, if the data contains a specific character string such as "confidential", or if the data contains customer information or billing information, the required security level is high. Sending and receiving such data in an unlicensed band can be intercepted.
  • the control unit 230 selects the license band as the frequency band to be used by the UE 100.
  • the control unit 230 may select an unlicensed band as the frequency band to be used by the UE 100.
  • the control unit 230 selects a frequency band to be used by the UE 100 from a licensed band and an unlicensed band based on the attributes of the user of the UE 100. For example, the subscriber identifier included in the connection request from the UE 100 is provided from the control unit 230 to the core network side, the user attribute is specified from the subscriber identifier on the core network side, and the specified user attribute is specified by the control unit 230. Gets.
  • the user's attribute means the user's job title or occupation. When the user of the UE 100 has a specific job title or a specific occupation, the control unit 230 selects a license band as the frequency band to be used by the UE 100.
  • the control unit 230 may select a frequency band to be used by the UE 100 in consideration of the degree of congestion in each frequency band.
  • the degree of congestion means, for example, the number of connections or connection rate of the UE 100 to the gNB 200, the amount of traffic sent / received by the gNB 200, the usage rate of wireless resources in the gNB 200, the usage rate of hardware (CPU, memory), and the like.
  • the control unit 230 selects a frequency band that is not congested as the frequency band to be used by the UE 100.
  • the control unit 230 may select a congested frequency band as the frequency band to be used by the UE 100.
  • the control unit 230 uses a congested frequency band as the frequency band to be used by the UE 100. You may choose.
  • the control unit 230 sets the frequency band to be used by the UE 100 from the macrocell frequency band F1 and the small cell frequency band F3 based on the UE-related information. select. For example, the control unit 230 may select the frequency band to be used by the UE 100 from the frequency band F1 of the macro cell and the frequency band F3 of the small cell based on the type or characteristic of the communication executed by the UE 100.
  • the control unit 230 may select the small cell frequency band F3 as the frequency band to be used by the UE 100. good.
  • the control unit 230 may select the frequency band F1 of the macrocell as the frequency band to be used by the UE 100.
  • FIG. 6 is a diagram showing a configuration of the UE 100 according to the embodiment.
  • the UE 100 includes a receiving unit 110, a transmitting unit 120, and a control unit 130.
  • the receiving unit 110 performs various receptions under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts the downlink radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 130.
  • the transmission unit 120 performs various transmissions under the control of the control unit 130.
  • the transmitter 120 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output by the control unit 130 into an uplink radio signal and transmits it from the antenna.
  • the control unit 130 performs various controls on the UE 100.
  • the control unit 130 includes at least one processor and at least one memory electrically connected to the processor.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor may include a baseband processor and a CPU (Central Processing Unit).
  • the baseband processor modulates / demodulates and encodes / decodes the baseband signal.
  • the CPU executes a program stored in the memory to perform various processes.
  • the transmission unit 120 transmits a connection request to the gNB 200.
  • the control unit 130 controls the connection process with the gNB 200.
  • the connection process with the gNB 200 may be referred to as a random access procedure.
  • the control unit 130 connects to the gNB 200 by a connection process.
  • the receiving unit 110 may receive a handover command from the gNB 200.
  • the control unit 130 performs a handover to the frequency band (cell) designated by the handover command according to the handover received by the receiving unit 110.
  • FIG. 7 is a diagram showing an operation flow of the gNB 200 according to the embodiment.
  • step S1 the receiving unit 110 of the gNB 200 receives the connection request from the UE 100.
  • step S2 the control unit 230 of the gNB 200 performs a connection process with the UE 100 in response to receiving a connection request. As a result, the control unit 230 of the gNB 200 tentatively establishes a connection with the UE 100.
  • step S3 the control unit 230 of the gNB 200 selects a frequency band to be used by the UE 100 from a licensed band (frequency band F1, frequency band F3) and an unlicensed band (frequency band F2) based on the UE-related information. ..
  • the control unit 230 of the gNB 200 may select the frequency band to be used by the UE 100 from the frequency band F1 of the macro cell and the frequency band F3 of the small cell based on the UE-related information. good.
  • step S4 the control unit 230 of the gNB 200 determines whether or not the frequency band of the own cell in which the UE 100 is located (that is, the frequency band used by the UE 100) matches the frequency band selected in step S3. do.
  • step S5 When the frequency band of the own cell in which the UE 100 is located (that is, the frequency band used by the UE 100) matches the frequency band selected in step S3 (step S4: YES), the UE 100 uses the frequency band in step S5.
  • the frequency band is fixed, and the connection with the UE 100 is fixed.
  • step S6 the control unit 230 of the gNB 200 controls the frequency selected in step S3.
  • the UE 100 is handed over to the band.
  • the control unit 230 of the gNB 200 controls the transmission unit 210 so as to transmit a handover command instructing the handover to the cell of the selected frequency band to the UE 100.
  • the gNB 200 When the gNB 200 establishes a connection with the UE 100 in response to a connection request from the UE 100, the gNB 200 selects a frequency band to be used by the UE 100 from a licensed band and an unlicensed band based on the UE-related information. When the frequency band used by the UE 100 is different from the selected frequency band, the gNB 200 performs the handover of the UE 100 to the selected frequency band. As a result, an appropriate frequency band can be used by the UE 100, so that the frequency utilization efficiency can be improved.
  • a program may be provided that causes a computer to execute each process according to the above-described embodiment.
  • the program may be recorded on a computer-readable medium.
  • Computer-readable media can be used to install programs on a computer.
  • the computer-readable medium on which the program is recorded may be a non-transient recording medium.
  • the non-transient recording medium is not particularly limited, but may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

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

Abstract

L'invention concerne une station de base destinée à être utilisée dans un système de communication cellulaire, la station de base comprenant une unité de commande qui sélectionne, lors de l'établissement d'une connexion avec un terminal sans fil en réponse à une demande de connexion provenant du terminal sans fil, une bande de fréquences devant être utilisée par le terminal sans fil parmi une bande sous licence et une bande sans licence, sur la base d'informations concernant le terminal sans fil. Si la bande de fréquences utilisée par le terminal sans fil est différente de la bande de fréquences sélectionnée, l'unité de commande effectue un transfert intercellulaire du terminal sans fil vers la bande de fréquences sélectionnée.
PCT/JP2021/019637 2020-05-27 2021-05-24 Station de base, procédé de commande de station de base et système de communication cellulaire WO2021241507A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006094005A (ja) * 2004-09-22 2006-04-06 Ntt Docomo Inc マルチバンド移動通信システムおよび送信機
JP2016152526A (ja) * 2015-02-18 2016-08-22 シャープ株式会社 端末装置
WO2017221459A1 (fr) * 2016-06-20 2017-12-28 シャープ株式会社 Dispositif terminal, procédé de commande, et programme
JP2019012954A (ja) * 2017-06-30 2019-01-24 ソフトバンク株式会社 基地局、移動通信システム及びハンドオーバ制御方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8838111B2 (en) 2010-09-09 2014-09-16 Panasonic Intellectual Property Corporation Of America Communication system, communication method, mobile terminal, and base station device
JP6648496B2 (ja) 2015-11-12 2020-02-14 日本電気株式会社 基地局装置、中継装置、制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006094005A (ja) * 2004-09-22 2006-04-06 Ntt Docomo Inc マルチバンド移動通信システムおよび送信機
JP2016152526A (ja) * 2015-02-18 2016-08-22 シャープ株式会社 端末装置
WO2017221459A1 (fr) * 2016-06-20 2017-12-28 シャープ株式会社 Dispositif terminal, procédé de commande, et programme
JP2019012954A (ja) * 2017-06-30 2019-01-24 ソフトバンク株式会社 基地局、移動通信システム及びハンドオーバ制御方法

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