WO2022153584A1 - Base station and communication terminal - Google Patents

Base station and communication terminal Download PDF

Info

Publication number
WO2022153584A1
WO2022153584A1 PCT/JP2021/030752 JP2021030752W WO2022153584A1 WO 2022153584 A1 WO2022153584 A1 WO 2022153584A1 JP 2021030752 W JP2021030752 W JP 2021030752W WO 2022153584 A1 WO2022153584 A1 WO 2022153584A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
communication terminal
communication
unit
cell
Prior art date
Application number
PCT/JP2021/030752
Other languages
French (fr)
Japanese (ja)
Inventor
誠 山本
秀章 新明
重人 鈴木
賢一 飯島
耕一 金森
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2022153584A1 publication Critical patent/WO2022153584A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/401—Circuits for selecting or indicating operating mode
    • 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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to base stations and communication terminals.
  • the present application claims priority based on Japanese Patent Application No. 2021-005754 filed in Japan on January 18, 2021, and the contents thereof are incorporated herein by reference.
  • Patent Document 1 describes a method for establishing communication between a base station and a user device using millimeter waves with a short transmission distance.
  • One aspect of the present invention is intended to facilitate the establishment of communication between a base station and a communication terminal.
  • the base station is a base station that communicates with a communication terminal, and includes a first communication unit that receives from another base station that there is a communication terminal that wants to connect to the base station, and the above.
  • the beam control unit that narrows the beam and the communication terminal transmit the broadcast information to the communication terminal using the narrowed beam. It is provided with two communication units.
  • the base station is a base station that communicates with a communication terminal, and receives from another base station that there is the communication terminal that wants to connect to the base station and the position information of the communication terminal.
  • 1 communication unit and a second communication unit that intensively transmits notification information to the periphery of the communication terminal based on the position information when receiving the fact that the communication terminal that wants to connect to the base station is present. , Equipped with.
  • the base station is a base station that communicates with a communication terminal, and is based on a first communication unit that receives position information of the communication terminal from another base station and the position information.
  • a control unit that detects the approach of the communication terminal to its own communication range, and when the approach to its own communication range is detected, information is intensively notified to the periphery of the communication terminal based on the position information.
  • a second communication unit for transmitting the information is provided.
  • the communication terminal is a communication terminal that communicates with a first base station and a second base station, and includes a position information acquisition unit that acquires position information indicating the position of the communication terminal, and the above.
  • a position information acquisition unit that acquires position information indicating the position of the communication terminal, and the above.
  • FIG. 1 is a diagram showing a configuration diagram and an example of processing of the communication system according to the first embodiment.
  • the communication system 100 has an LTE base station eNB, an NR base station gNB using a millimeter wave band, and a communication terminal UE.
  • the LTE base station eNB and the NR base station gNB are connected to a core network (not shown) which is a backbone network, and the LTE base station eNB and the NR base station gNB can communicate with each other via the core network.
  • the LTE base station eNB communicates with the communication terminal UE in the cell (LTE cell) 101, which is an area in which the LTE base station eNB can communicate, by LTE (Long Term Evolution). Further, the LTE base station eNB transmits broadcast information (System Information Block) including information used for connection with the LTE base station eNB to the communication terminal UE.
  • the broadcast information includes, for example, information such as PLMN (Public Land Mobile Network) for identifying a business operator, a band number indicating a frequency, and Cell ID for selecting a base station. Further, the broadcast information includes information (peripheral base station information) indicating whether or not the NR base station gNB exists in the cell 101 of the LTE base station eNB.
  • the LTE base station eNB is an example of a first base station.
  • the NR base station gNB communicates with the communication terminal UE in the cell 201 (millimeter wave band NR cell), which is a communicable area, by the NR base station gNB by 5G NR (New Radio) (hereinafter referred to as NR).
  • NR 5G NR
  • a radio wave having a frequency higher than that of the LTE radio wave is used.
  • the NR base station gNB communicates in NR with millimeter waves (mmW) in the frequency band from 24.25 GHz to 52.6 GHz.
  • mmW millimeter waves
  • NR is a wireless system of the 5th generation mobile communication system.
  • the NR base station gNB is installed in the cell 101.
  • the NR base station gNB can extend the reach of the beam by narrowing the beam output from the NR base station gNB by beamforming, and can communicate with the communication terminal UE in the cell 202 having a wider range than the cell 201. ..
  • the NR base station gNB transmits broadcast information (System Information Block) including information used for connection with the NR base station gNB to the communication terminal UE using millimeter waves.
  • the broadcast information includes, for example, information such as PLMN (Public Land Mobile Network) for identifying a business operator, a band number indicating a frequency, and Cell ID for selecting a base station.
  • PLMN Public Land Mobile Network
  • the NR base station gNB is an example of a second base station.
  • the communication terminal UE is a device capable of communicating with LTE and NR (for example, millimeter wave).
  • the communication terminal UE communicates with the LTE base station eNB and the NR base station gNB.
  • the communication terminal UE receives the broadcast information from the LTE base station eNB, and communicates with the LTE base station eNB by LTE based on the broadcast information. Further, the communication terminal UE receives the broadcast information from the NR base station gNB and communicates with the NR base station gNB using the NR based on the broadcast information.
  • the communication terminal UE enables high-speed communication as compared with communication using LTE.
  • the communication terminal UE is, for example, a communication device such as a smartphone, a tablet, or a laptop.
  • the NSA mode has a form in which NR is controlled by using LTE.
  • the communication terminal UE transmits and receives control information to and from the LTE base station eNB, and also transmits and receives data to and from each of the LTE base station eNB and the NR base station gNB.
  • the SA mode is a form in which the NR operates alone. In the SA mode, the communication terminal UE transmits / receives control information and data to / from the NR base station gNB.
  • the LTE base station eNB, the NR base station gNB, and the communication terminal UE of the embodiment correspond to the NSA mode.
  • the LTE base station eNB, the NR base station gNB, and the communication terminal UE of the embodiment may support both the NSA mode and the SA mode.
  • the communication terminal UE is located outside the cell 201 (outside the range) and inside the cell 202 (within the range).
  • the communication range (coverage area) is cell 201.
  • the NR base station gNB performs normal beamforming, and since the communication terminal UE is located outside the cell 201, it cannot receive (detect) the broadcast information from the NR base station gNB. Therefore, the communication terminal UE first receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information.
  • Step S151 When the communication terminal UE determines that it is connected to the NR base station gNB, it notifies the LTE base station eNB that it wants to connect to the NR base station gNB. For example, the communication terminal UE determines that the NR base station gNB is connected to the NR base station gNB when the NR base station gNB exists in the cell 101 of the LTE base station eNB but the communication terminal UE has not established a connection with the NR base station gNB. .. Further, the communication terminal UE may determine to connect to the NR base station gNB when receiving an instruction for high-speed communication from a user or performing large-capacity communication for uploading or downloading large-sized data.
  • the position of the communication terminal UE is close to the cell 201 of the NR base station gNB based on the position information of the terminal device UE (for example, the distance between the communication terminal UE and the NR base station gNB is equal to or less than a predetermined value. ), It may be determined that the connection is made to the NR base station gNB. In this way, the communication terminal UE determines that it connects to the NR base station gNB when it wants to communicate in millimeter waves (when it wants to connect to the NR base station gNB), in other words, when it wants to perform high-speed communication. Further, the communication terminal UE transmits the position information indicating the position of the communication terminal UE to the LTE base station eNB.
  • Step S152 When the LTE base station eNB receives the position information that it wants to connect to the NR base station gNB from the communication terminal UE, it transmits the fact that there is a communication terminal that wants to connect and the position information of the communication terminal UE to the NR base station gNB.
  • Step S153 When the NR base station gNB receives that there is a communication terminal to be connected to, the NR base station gNB further narrows the beam used for transmitting the broadcast information from the current (predetermined) aperture condition. As a result, the reach of the beam extends beyond the range of cell 201 and reaches the range of cell 202. Then, the NR base station gNB intensively searches the periphery of the communication terminal UE based on the received position information of the communication terminal UE. That is, the NR base station gNB transmits the broadcast information by intensively transmitting the beam focused around the communication terminal UE.
  • the broadcast information reaches the communication terminal UE by the focused beam, and when the communication terminal UE receives the broadcast information, the communication with the NR base station gNB is established based on the broadcast information.
  • the configuration of the communication system 100 described above is an example, and the numbers and positions of the LTE base station eNB, the NR base station gNB, and the communication terminal UE are not limited to the above configuration.
  • FIG. 2 is an example of a configuration diagram of an LTE base station according to the first embodiment.
  • the LTE base station eNB has a control unit 211, a wireless communication unit 221, a network communication unit 231 and a storage unit 241.
  • the control unit 211 controls the LTE base station eNB.
  • the control unit 211 has a communication control unit 212.
  • the communication control unit 212 controls communication with the communication terminal UE and communication with the NR base station gNB.
  • the control unit 211 is, for example, a processor such as a CPU (Central Processing Unit).
  • the wireless communication unit 221 communicates with the communication terminal UE by LTE using an antenna (not shown) connected to the wireless communication unit 221 under the control of the communication control unit 212.
  • the wireless communication unit 221 is, for example, a communication interface that performs data conversion and the like associated with communication.
  • the network communication unit 231 communicates with the NR base station gNB via the core network (not shown) under the control of the communication control unit 212.
  • the network communication unit 231 is, for example, a communication interface that performs data conversion and the like associated with communication.
  • the storage unit 241 stores data, programs, etc. used in the LTE base station eNB.
  • the storage unit 241 is, for example, a storage device such as an HDD (Hard Disk Drive), a RAM (Random Access Memory), or a flash memory.
  • FIG. 3 is an example of a configuration diagram of an NR base station using the millimeter wave band according to the first embodiment.
  • the NR base station gNB has a control unit 311, a wireless communication unit 321 and a network communication unit 331, and a storage unit 341.
  • the control unit 311 controls the NR base station gNB.
  • the control unit 311 includes a communication control unit 312 and a beam control unit 313.
  • the communication control unit 312 controls communication with the communication terminal UE and communication with the LTE base station eNB.
  • the beam control unit 313 controls the beam of the NR (for example, millimeter wave) used by the wireless communication unit 321 for communication.
  • the beam control unit 313 controls the degree of aperture of the beam (directivity of radio waves).
  • the beam control unit 313 narrows the beam so that the reach of the beam in a specific direction is widened. The narrower the beam, that is, the narrower the width of the beam, the wider the reach of the beam.
  • beamforming Such a technique of intensively transmitting radio waves in a specific direction is called beamforming.
  • the wireless communication unit 321 communicates with the communication terminal UE by NR using an antenna (not shown) connected to the wireless communication unit 321 under the control of the communication control unit 312. Further, the wireless communication unit 321 may communicate with the communication terminal UE with a beam of NR narrowed down by the control of the beam control unit 313.
  • the wireless communication unit 321 is, for example, a communication interface that performs data conversion and the like associated with communication.
  • the wireless communication unit 321 is an example of the second communication unit.
  • the network communication unit 331 communicates with the LTE base station eNB via the core network (not shown) under the control of the communication control unit 312.
  • the network communication unit 331 is, for example, a communication interface that performs data conversion and the like associated with communication.
  • the network communication unit 331 is an example of the first communication unit.
  • the storage unit 341 stores data, programs, etc. used in the NR base station gNB.
  • the storage unit 341 is, for example, a storage device such as an HDD, a RAM, or a flash memory.
  • FIG. 4 is an example of a configuration diagram of a communication terminal according to the first embodiment.
  • the communication terminal UE has a control unit 411, a position acquisition unit 421, a communication unit 231 and a storage unit 441.
  • the control unit 411 controls the communication terminal UE.
  • the control unit 411 has a communication control unit 412.
  • the communication control unit 412 controls communication with the LTE base station eNB and communication with the NR base station gNB.
  • the control unit 411 is, for example, a processor such as a CPU.
  • the position acquisition unit 421 acquires position information indicating the position of the communication terminal UE.
  • the position acquisition unit 421 acquires position information indicating the position of the communication terminal UE by using, for example, GPS (Global Positioning System). Further, the position acquisition unit 421 may acquire position information (for example, cell ID) indicating the position of the communication terminal UE from the LTE base station eNB, for example.
  • the position acquisition unit 421 is realized by, for example, a logic circuit (hardware) formed in an integrated circuit (IC (Integrated Circuit) chip) or the like.
  • the communication unit 231 communicates with the LTE base station eNB by LTE using an antenna (not shown) connected to the communication unit 231 under the control of the communication control unit 412. Further, the communication unit 231 communicates with the NR base station gNB by NR (for example, millimeter wave) using an antenna (not shown) connected to the communication unit 231.
  • the communication unit 231 is, for example, a communication interface that performs data conversion and the like associated with communication.
  • the storage unit 441 stores data, programs, and the like used in the communication terminal UE.
  • the storage unit 341 is, for example, a storage device such as an HDD, a RAM, or a flash memory.
  • FIG. 5 is an example of a sequence diagram of the control process according to the first embodiment.
  • the wireless communication unit 321 of the NR base station gNB normally transmits broadcast information periodically in all directions in which the preset NR base station gNB transmits the beam by using a beam having a predetermined aperture. is doing. Specifically, for example, the wireless communication unit 321 normally transmits a beam periodically in all directions in which the preset NR base station gNB transmits the beam, or the preset NR base station gNB transmits the beam periodically. All directions of beam transmission are divided into a plurality of directions, the beam transmission direction is changed, and the beam is periodically transmitted in order for each one of the plurality of directions, and is preset around the NR base station gNB. The NR base station gNB transmits the beam evenly in all directions in which the beam is transmitted. The wireless communication unit 321 transmits the broadcast information by the beam. Normally, the broadcast information is transmitted within the range of the cell 201 as shown in FIG.
  • the communication terminal UE is located outside the range of the cell 201. Therefore, the communication terminal UE has not detected the NR beam from the NR base station gNB, has not received the broadcast information from the NR base station gNB, and has not established communication with the NR base station gNB. .. Further, since the communication terminal UE is within the range of the cell 101, it can communicate with the LTE base station eNB.
  • step S501 the communication control unit 412 of the communication terminal UE receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information. Then, the communication control unit 412 determines that the connection is made to the NR base station gNB. For example, since the communication control unit 412 has not established a connection with the NR base station gNB, it determines that the connection is made with the NR base station gNB. Further, the communication control unit 412 may determine that the connection is made to the NR base station gNB when a large-capacity communication is started or when a user gives an instruction for high-speed communication.
  • the communication control unit 412 determines that the communication terminal UE is connected to the NR base station gNB when the position of the communication terminal UE is close to the cell 201 (when the distance between the communication terminal UE and the cell 201 is equal to or less than a predetermined value). May be good.
  • step S502 the communication unit 431 is determined to connect to the NR base station gNB, and therefore notifies the LTE base station eNB that it wants to connect to the NR base station gNB.
  • the wireless communication unit 221 of the LTE base station eNB receives a notification from the communication terminal UE that it wants to connect to the NR base station gNB.
  • step S503 the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information from the communication terminal UE.
  • step S504 the network communication unit 231 of the LTE base station eNB states that there is a communication terminal UE that wants to connect to the NR base station gNB outside the range of cell 201, which is the normal communication range of the NR base station gNB, and that the communication terminal UE And the position information of are transmitted to the NR base station gNB.
  • the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB from the LTE base station eNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB. , The position information of the communication terminal UE, and is received.
  • the beam control unit 313 indicates that the network communication unit 331 has a communication terminal UE that wants to connect to the NR base station gNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB, and the communication terminal UE.
  • the beam output by the wireless communication unit 321 is further narrowed down from the current narrowing condition.
  • the beam control unit 313 controls the degree of aperture of the beam based on the position information of the communication terminal UE.
  • the beam control unit 313 narrows the beam to the extent that the beam reaches the position of the communication terminal UE based on the position information of the communication terminal UE.
  • the beam control unit 313 increases the aperture of the beam as the distance between the NR base station gNB and the communication terminal UE increases so that the beam can reach farther. As a result, the reach of the beam becomes longer than before the beam is narrowed down. For example, the beam reaches outside the range of cell 201 in FIG. 1, and the beam reaches the range of cell 202.
  • the wireless communication unit 321 uses the beam focused by the beam control unit 313 in step S505 based on the position information of the communication terminal UE, and includes the position of the communication terminal UE in the periphery (for example, of the communication terminal UE).
  • the broadcast information is intensively transmitted to a preset range (within a radius of X meters) centered on the position.
  • the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE, for example, the cycle of transmitting the broadcast information in the direction in which the communication terminal UE is as seen from the NR base station gNB. Is shorter than the cycle for transmitting broadcast information in the direction in which the communication terminal UE is not present.
  • the frequency of transmitting the broadcast information in the direction in which the communication terminal UE is located when viewed from the NR base station gNB is increased.
  • the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE
  • the time for transmitting the broadcast information in the direction in which the communication terminal UE is as seen from the NR base station gNB. May be longer than the time for transmitting the broadcast information in the direction in which the communication terminal UE is not present. This makes it easier for the broadcast information to reach the communication terminal UE.
  • step S507 the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB.
  • step S508 the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB based on the received notification information.
  • the position acquisition unit 421 of the communication terminal UE does not have to transmit the position information to the LTE base station eNB, the NR base station gNB does not receive the position information, and the wireless communication unit 321 is the position of the communication terminal UE. It is not necessary to intensively transmit the notification information to the surroundings including.
  • the radio communication unit 321 changes the transmission direction of the beam, and broadcast information by the beam periodically narrowed in each direction around the NR base station gNB at equal intervals. May be sent.
  • communication can be established with a communication terminal UE outside the range of the normal cell 201 of the NR base station gNB.
  • it is possible to extend the distance at which communication can be established between the NR base station gNB and the communication terminal UE.
  • communication between the communication terminal UE and the NR base station gNB can be easily established.
  • FIG. 6 is a diagram showing a modified example of the processing of the communication system according to the first embodiment.
  • the communication terminal UE1 is outside the range of the cell 202 and within the range of the cell 203.
  • the beam control unit 313 narrows the beam further than when the communication terminal is in the cell 202 based on the position information of the communication terminal UE1, and the beam extends to the range of the cell 203 (that is, outside the range of the cell 202). Make it reachable. Based on the position information, the beam control unit 313 narrows the beam (narrows the width of the beam) as the distance between the communication terminal UE and the NR base station gNB increases, so that the beam reaches farther.
  • the communication terminals UE2 and UE3 are outside the range of the cell 101 and within the range of the cell 202, and the distance between the communication terminal UE2 and the communication terminal UE3 is short.
  • the beam control unit 313 tells that the network communication unit 331 has a plurality of communication terminals UE2 and UE3 that the network communication unit 331 wants to connect to the NR base station gNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB, and the communication terminal UE2.
  • the beam output by the wireless communication unit 321 is narrowed down.
  • the beam is narrowed a little.
  • the width of the beam becomes wider than the case where the beam is delivered to the communication terminal UE1 outside the range of the cell 202 as described above, and the beam can easily reach both the communication terminal UE2 and the communication terminal UE3.
  • the beam control unit 313 controls the degree of aperture of the beam to know the detailed position of the communication terminal UE.
  • the aperture of the beam may be weaker than in the case, that is, wider than the width of the beam when the detailed position of the communication terminal UE is known.
  • the beam control unit 313 controls the beam focusing degree (radio wave directivity) according to the number of communication terminal UEs or the distance between the communication terminal UE and the NR base station gNB, and the reach distance of the beam. And by changing the width, it is possible to make it easier for the beam to reach the communication terminal UE.
  • the communication terminal UE is in the millimeter wave band NR cell, and when the communication terminal UE wants to operate in SA mode, even if the communication terminal UE tries to connect to the NR base station gNB from the beginning, it is caused by obstacles in the city. Due to the attenuation, it may be difficult for the NR from the NR base station gNB to reach the communication terminal UE, and it may be difficult to connect to the NR base station gNB.
  • the LTE base station gNB is connected first. Then connect to the NR base station gNB. Then, the communication terminal UE may release LTE from the state of NSA mode (disconnect communication with the LTE base station gNB) and operate in SA mode as initially desired. The communication system may be operated in the NSA mode without releasing LTE.
  • FIG. 7 is a diagram showing a configuration diagram and an example of processing of the communication system according to the second embodiment.
  • the communication system 200 has an LTE base station eNB, an NR base station gNB, and a communication terminal UE.
  • the configurations of the LTE base station eNB, the NR base station gNB, and the communication terminal UE of the second embodiment are the LTE base station eNB, the NR base station gNB, and the NR base station gNB of the first embodiment shown in FIGS. Since the configuration is the same as that of the communication terminal UE, detailed description thereof will be omitted.
  • steps S701 to S703 in FIG. 7 will be briefly described.
  • the communication terminal UE is located within the range of cell 201. As shown in FIG. 7, the communication terminal UE is located within the range of the cell 201, but is not in the line-of-sight environment (that is, there are many obstacles around the communication terminal UE, and the NR from the NR base station gNB (that is,) For example, millimeter waves) are difficult to reach the communication terminal UE), and NR from the NR base station gNB is not detected.
  • Step S701 First, since the communication terminal UE has not received the broadcast information from the NR base station gNB, it establishes communication with the LTE base station eNB. Then, the communication terminal UE transmits to the LTE base station eNB that it wants to connect to the NR base station gNB and the position information of the communication terminal UE. The LTE base station eNB receives the fact that it wants to connect to the NR base station gNB and the position information of the communication terminal UE.
  • Step S702 The LTE base station eNB determines that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of cell 201, which is the normal communication range of the NR base station gNB, and the position information of the communication terminal UE. Send to gNB. Then, the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of the cell 201, which is the normal communication range of the NR base station gNB, from the LTE base station eNB. , The position information of the communication terminal UE, and is received.
  • Step S703 Based on the position information of the communication terminal UE, the NR base station gNB uses a beam to intensively transmit the broadcast information to the periphery including the position of the communication terminal UE. At this time, the NR base station gNB may narrow the beam by beamforming.
  • the communication terminal UE receives the broadcast information from the NR base station gNB, the communication terminal UE establishes communication with the NR base station gNB based on the received broadcast information.
  • the communication terminal UE may release LTE and operate in SA mode.
  • FIG. 8 is an example of a sequence diagram of the control process according to the second embodiment.
  • the communication terminal UE is located within the range of the cell 201, but is not in the line-of-sight environment and is in a state where the NR from the NR base station gNB is not detected. Further, since the communication terminal UE is within the range of the cell 101, it can communicate with the LTE base station eNB.
  • step S801 the communication control unit 412 of the communication terminal UE receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information. Then, the communication control unit 412 determines that the connection is made to the NR base station gNB. For example, the communication control unit 412 determines that the NR base station gNB is connected to the NR base station gNB because the NR base station gNB exists in the cell 101 of the LTE base station eNB but the connection with the NR base station gNB has not been established.
  • the communication control unit 412 may determine that the connection is made to the NR base station gNB when a large-capacity communication is started or when a user gives an instruction for high-speed communication. Further, the communication control unit 412 may determine that the communication terminal UE is connected to the NR base station gNB when the position of the communication terminal UE is within the range of the cell 201.
  • step S802 the communication unit 431 is determined to connect to the NR base station gNB, and therefore notifies the LTE base station eNB that it wants to connect to the NR base station gNB.
  • the wireless communication unit 221 of the LTE base station eNB receives a notification from the communication terminal UE that it wants to connect to the NR base station gNB.
  • step S803 the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information from the communication terminal UE.
  • step S804 the network communication unit 231 of the LTE base station eNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of cell 201, which is the normal communication range of the NR base station gNB, and that the communication terminal UE And the position information of are transmitted to the NR base station gNB. Then, the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of the cell 201, which is the normal communication range of the NR base station gNB, from the LTE base station eNB. , The position information of the communication terminal UE, and is received.
  • step S806 the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE by using the beam based on the position information of the communication terminal UE.
  • step S807 the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB.
  • step S808 the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB based on the received notification information.
  • the wireless communication unit 321 of the NR base station gNB may transmit an LTE release instruction to the communication terminal UE.
  • the communication unit 431 of the communication terminal UE releases LTE, and the communication terminal UE operates in the SA mode.
  • the broadcast information is intensively transmitted around the communication terminal UE. This makes it easier to establish communication between the communication terminal UE and the NR base station gNB. This is particularly effective when the NR base station gNB using the millimeter wave band is a local 5G operation and the MCC (Mobile Country Code) and MNC (Mobile Network Code) are different.
  • MCC Mobile Country Code
  • MNC Mobile Network Code
  • the communication terminal UE that is establishing a connection with the first NR base station gNB1 moves, so that the communication terminal UE moves out of the range of the cell of the first NR base station gNB1 and the second NR.
  • the communication terminal UE When approaching the cell of the base station gNB2 or entering the range of the cell of the second NR base station gNB2, it facilitates the establishment of a connection with the second NR base station gNB2.
  • FIG. 9 is a diagram showing a configuration diagram and an example of processing of the communication system according to the third embodiment.
  • the communication system 300 has an LTE base station eNB, an NR base station gNB1, gNB2, and a communication terminal UE.
  • the communication range of the LTE base station eNB is cell 101
  • the normal communication range of the NR base stations gNB1 and gNB2 is cells 211-1 and 201-2, respectively.
  • the configuration of the LTE base station eNB of the third embodiment, the NR base stations gNB1 and gNB2 using the millimeter wave band, and the communication terminal UE is the LTE base station of the first embodiment shown in FIGS. Since the configurations are the same as those of the eNB, the NR base station gNB, and the communication terminal UE, detailed description thereof will be omitted.
  • steps S901 to S909) in FIG. 9 will be briefly described.
  • the communication terminal UE is initially located within the range of cell 201-1.
  • Step S901 First, the communication terminal UE is within the range of cell 211-1 of the NR base station gNB1 as shown in FIG. 10, and is establishing communication with the NR base station gNB1.
  • Step S902 the communication terminal UE is within the range of cell 101 of the LTE base station eNB, and has established communication with the LTE base station eNB.
  • the communication terminal UE acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB.
  • Step S903 The communication terminal UE exits the range of cell 211-1 and moves in the direction of the NR base station gNB2.
  • Step S904 The NR base station gNB1 determines that when the communication terminal UE moves to the end of cell 201-1, the communication terminal UE goes out of the range of cell 201-1, and the communication terminal UE goes out of the range of cell 201-1. Notify the LTE base station eNB to that effect. Further, the NR base station gNB1 transmits an instruction to release the NR to the communication terminal UE, and the communication terminal UE releases the NR when receiving the instruction to release the NR.
  • Step S905 The communication terminal UE is within the range of the cell 101 even if it comes out of the range of the cell 211-1, and the communication with the LTE base station eNB remains established.
  • the communication terminal UE acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB.
  • Step S906 The LTE base station eNB transmits the position information of the communication terminal UE to the NR base station gNB2 in cell 201-2 in the traveling direction of the communication terminal UE.
  • Step S907 The communication terminal UE moves in the direction of the NR base station gNB2, approaches the cell 201-2 of the NR base station gNB2, and then enters the range of the cell 201-2.
  • Step S908 When the NR base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, which is the communication range of the NR base station gNB2, the NR base station gNB2 uses a beam to intensively transmit the broadcast information to the surroundings including the position of the communication terminal UE. do.
  • Step S909 The communication terminal UE receives broadcast information from the NR base station gNB2 and establishes communication with the NR base station gNB2 based on the received broadcast information.
  • the NR base station gNB2 when the communication terminal UE exits the cell 211-1 of the NR base station gNB1 and moves to the cell 201-2 of the NR base station gNB2, the NR base station gNB2 By detecting the approach of the communication terminal UE and centrally transmitting the broadcast information to the communication terminal UE, the communication terminal UE can easily establish a connection with the NR base station gNB2.
  • FIG. 10 is an example of a sequence diagram of control processing according to the third embodiment.
  • the communication terminal UE is within the range of cell 101 of the LTE base station eNB and within the range of cell 211-1 of the NR base station gNB1 as shown in FIG. 10, from each of the LTE base station eNB and the NR base station gNB1. It receives the broadcast information and establishes communication with each of the LTE base station eNB and the NR base station gNB1, and can communicate with each of the LTE base station eNB and the NR base station gNB1.
  • step S1001 the communication unit 431 is establishing communication with the LTE base station eNB and the NR base station gNB1.
  • step S1002 the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Further, the communication control unit 412 detects the reception level of the radio wave (NR) received from the NR base station gNB1, and the communication unit 431 transmits the reception level to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information and the reception level from the communication terminal UE. After that, the position acquisition unit 421 continuously transmits the position information to the LTE base station eNB.
  • NR radio wave
  • the position acquisition unit 421 constantly or periodically acquires the position information indicating the position of the communication terminal UE, and transmits the position information to the LTE base station eNB. Further, thereafter, the communication unit 431 continuously transmits the reception level to the LTE base station eNB. That is, the communication control unit 412 constantly or periodically detects the reception level of the radio wave received from the NR base station gNB1, and the communication unit 431 constantly or periodically transmits the reception level to the LTE base station eNB. ..
  • the network communication unit 231 of the LTE base station eNB transmits the position information and reception level of the communication terminal UE received from the communication terminal UE to the NR base station gNB1 which is establishing a connection with the communication terminal UE.
  • Information on which NR base station the communication terminal UE is establishing communication with is received from the NR base station that the LTE base station eNB receives from the communication terminal UE or from the NR base station that is establishing a connection with the communication terminal UE. ..
  • the network communication unit 331 of the NR base station gNB1 receives the position information and the reception level of the communication terminal UE from the LTE base station eNB.
  • the communication control unit 312 of the NR base station gNB1 checks the received position information and the reception level, and depending on whether or not the reception level is equal to or less than a predetermined threshold value, the communication terminal UE sets the range of the cell 201-1. Determine if you want to go out. For example, the communication control unit 312 of the NR base station gNB1 determines that the communication terminal UE goes out of the range of cells 201-1 when the reception level is equal to or less than a predetermined threshold value. Further, thereafter, the network communication unit 231 of the LTE base station eNB continuously transmits the position information and the reception level of the communication terminal UE received from the communication terminal UE to the NR base station gNB1.
  • the communication terminal UE moves in the cell 201-1 in the direction away from the NR base station gNB1 and moves to the end of the cell 201-1.
  • the reception level of the radio wave received from the NR base station gNB1 is lowered, and the reception level becomes equal to or lower than the predetermined threshold value.
  • step S1004 the communication control unit 312 of the NR base station gNB1 has set the reception level of the radio wave from the NR base station gNB1 detected by the communication terminal UE to be equal to or lower than a predetermined threshold value, so that the communication terminal UE is set to the cell 201.
  • Judged to be out of the range of -1 For example, as shown in FIG. 9, the communication terminal UE moves from the position surrounded by the dotted line in the range of the cell 211-1 in the direction in which the NR base station gNB2 is located, and exits the range of the cell 211-1. ..
  • step S1005 the radio communication unit 321 of the NR base station gNB1 notifies the LTE base station eNB that the communication terminal UE leaves the cell 201-1.
  • step S1006 the radio communication unit 321 of the NR base station gNB1 transmits an instruction to release the NR to the communication terminal UE.
  • the communication unit 431 of the communication terminal UE receives the instruction to release the NR, the communication unit 431 releases the NR.
  • step S1007 the communication unit 431 of the communication terminal UE released the NR in step S1006 and disconnected the communication with the NR base station gNB1, but the communication with the LTE base station eNB is still being established.
  • step S1008 the communication terminal UE moves near cell 201-2 or within the range of cell 201-2. As described in step S1002, the position information of the communication terminal UE is continuously transmitted to the LTE base station eNB.
  • step S1009 when the network communication unit 231 of the LTE base station eNB receives that the communication terminal UE transmitted in step S1005 leaves the cell 201-1, the network communication unit 231 of the communication terminal UE is based on the position information of the communication terminal UE. Position information is transmitted to the surrounding NR base station gNB2.
  • the NR base stations around the communication terminal UE are, for example, the cells 201-in the traveling direction of the communication terminal UE among the NR base stations other than the NR base station gNB1 of the cell 211-1 determined to output the communication terminal UE. 2 NR base station gNB2.
  • the communication control unit 212 of the LTE base station eNB calculates, for example, the traveling direction of the communication terminal UE from the position information of the communication terminal UE before a predetermined time from the present and the position information of the current communication terminal, and the LTE base station eNB Based on the base station position information indicating the positions of the NR base stations gNB1 and gNB2 stored in the storage unit 241 of the communication terminal UE, the NR base station gNB2 of the cell 201-2 in the traveling direction of the communication terminal UE is detected.
  • the network communication unit 231 of the LTE base station eNB continuously transmits the position information of the communication terminal UE received from the communication terminal UE to the NR base station gNB2. Further, the network communication unit 231 of the LTE base station eNB may continuously further transmit the reception level received from the communication terminal UE to the NR base station gNB2.
  • the NR base stations around the communication terminal UE are, for example, the NR bases closest to the communication terminal UE among the NR base stations other than the NR base station gNB1 in the cell 201-1 determined to output the communication terminal UE.
  • the station gNB2 or the NR base station gNB2 whose distance from the communication terminal UE may be equal to or less than a predetermined value may be used.
  • step S1010 the communication control unit 212 of the NR base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, which is the communication range of itself (NR base station gNB2), based on the position information of the communication terminal UE. do.
  • the communication control unit 212 calculates the distance between the communication terminal UE and the NR base station gNB2 based on the position information, and when the calculated distance is equal to or less than a predetermined value, the communication terminal UE approaches cell 201-2. It is detected that it has been done.
  • the storage unit 341 stores information indicating the range of the cell 201-2, and the communication control unit 212 sets the cell 201-2 based on the information indicating the range of the cell 201-2 and the position information.
  • the distance to the communication terminal UE is calculated, and if the calculated distance is equal to or less than a predetermined value, it may be detected that the communication terminal UE has approached cell 201-2.
  • the communication control unit 212 sends the communication terminal UE to the cell 201-2 based on the information indicating the range of the cell 201-2 and the position information. It may be detected as approaching.
  • step S1011 the wireless communication unit 321 of the NR base station gNB2 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE using a beam based on the position information of the communication terminal UE.
  • the method of intensively transmitting the notification information is the same as that of the first embodiment.
  • step S1012 as soon as the communication terminal UE enters the range of cell 202-2, the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB2.
  • step S1013 the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB2 based on the received notification information.
  • the NR The base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, and intensively transmits the broadcast information to the periphery of the communication terminal UE. As a result, the broadcast information can be received as soon as the communication terminal UE enters the cell 201-2, and it becomes easy to establish communication between the communication terminal UE and the NR base station gNB2.
  • step S1011 when the beam control unit 313 of the NR base station gNB2 detects the approach of the communication terminal UE to the cell 202-2 by the communication control unit 312 of the NR base station gNB2, wireless communication is performed.
  • the beam output by the unit 321 may be further narrowed from the current narrowing condition.
  • the beam control unit 313 of the NR base station gNB2 narrows the beam based on the position information, for example, as in the first embodiment.
  • step S1011 the wireless communication unit 321 of the NR base station gNB2 concentrates on the periphery including the position of the communication terminal UE by using the beam focused by the beam control unit 313 based on the position information of the communication terminal UE.
  • the notification information may be transmitted to.
  • the wireless communication unit 321 before the communication terminal UE approaches the cell 202-2 and the communication terminal UE enters the range of the cell 202-2, that is, the communication terminal UE moves out of the range of the cell 202-2. Even if there is, the notification information can be delivered.
  • the control blocks (particularly, control units 211, 311 and 411) of the LTE base station eNB, the NR base station gNB, and the communication terminal UE are logic circuits (hardware) formed in an integrated circuit (IC (Integrated Circuit) chip) or the like. ), And may be realized by software using a CPU (Central Processing Unit).
  • the LTE base station eNB, the NR base station gNB, and the communication terminal UE are a CPU that executes instructions of a program that is software that realizes each function, and the above program and various data can be read by a computer (or CPU).
  • ROM or storage device (these are referred to as “recording media") recorded in the program, a RAM for developing the above program, and the like.
  • the computer or CPU
  • the program reads the program from the recording medium and executes it, it operates as the control units 211, 311 and 411, and the object of the present invention is achieved.
  • the recording medium a "non-temporary tangible medium", for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via any transmission medium capable of transmitting.
  • the present invention is not limited to the above-described embodiment, but can be modified, and the above-mentioned configuration achieves substantially the same configuration, a configuration exhibiting the same action and effect, or the same object. Can be replaced with a configuration that allows.

Landscapes

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

Abstract

The present invention makes it possible to easily establish communication between a base station and a communication terminal. The base station communicates with a communication terminal, and comprises: a first communication unit that receives, from another base station, information to the effect that the communication terminal is present and is seeking to connect with the base station; a beam control unit that focuses a beam when the first communication unit has received the information to the effect that the communication terminal is present and is seeking to connect with the base station; and a second communication unit that uses the focused beam to transmit notification information to the communication terminal.

Description

基地局および通信端末Base station and communication terminal
　本発明は、基地局および通信端末に関する。
　本願は、２０２１年１月１８日に日本で出願された特願２０２１－００５７５４号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to base stations and communication terminals.
The present application claims priority based on Japanese Patent Application No. 2021-005754 filed in Japan on January 18, 2021, and the contents thereof are incorporated herein by reference.
　特許文献１には、伝送距離の短いミリ波を用いた基地局とユーザ機器との通信の確立方法が記載されている。 Patent Document 1 describes a method for establishing communication between a base station and a user device using millimeter waves with a short transmission distance.
特許第６４０６７７７号公報Japanese Patent No. 6406777
　ミリ波で通信を行う基地局では、ミリ波の到達距離が短いため、狭いカバレッジエリアの外にある端末を認識し、通信を確立することが困難である。また、基地局のカバレッジエリア内であっても、見通し環境でない場合には通信端末との通信の確立が困難な場合がある。 In a base station that communicates with millimeter waves, it is difficult to recognize terminals outside the narrow coverage area and establish communication because the reach of millimeter waves is short. Further, even within the coverage area of the base station, it may be difficult to establish communication with the communication terminal in a non-line-of-sight environment.
　本発明の一態様は、基地局と通信端末間の通信の確立を容易にすることを目的とする。 One aspect of the present invention is intended to facilitate the establishment of communication between a base station and a communication terminal.
　本発明の一態様に係る基地局は、通信端末と通信する基地局であって、前記基地局に接続したい前記通信端末がいる旨を他の基地局から受信する第１の通信部と、前記基地局に接続したい前記通信端末がいる旨を前記第１の通信部が受信した場合に、ビームを絞るビーム制御部と、前記通信端末へ報知情報を前記絞られたビームを用いて送信する第２の通信部と、を備える。 The base station according to one aspect of the present invention is a base station that communicates with a communication terminal, and includes a first communication unit that receives from another base station that there is a communication terminal that wants to connect to the base station, and the above. When the first communication unit receives that there is the communication terminal to be connected to the base station, the beam control unit that narrows the beam and the communication terminal transmit the broadcast information to the communication terminal using the narrowed beam. It is provided with two communication units.
　本発明の一態様に係る基地局は、通信端末と通信する基地局であって、前記基地局に接続したい前記通信端末がいる旨および前記通信端末の位置情報を他の基地局から受信する第１の通信部と、前記基地局に接続したい前記通信端末がいる旨を受信した場合、前記位置情報に基づいて、前記通信端末の周辺へ集中的に報知情報を送信する第２の通信部と、を備える。 The base station according to one aspect of the present invention is a base station that communicates with a communication terminal, and receives from another base station that there is the communication terminal that wants to connect to the base station and the position information of the communication terminal. 1 communication unit and a second communication unit that intensively transmits notification information to the periphery of the communication terminal based on the position information when receiving the fact that the communication terminal that wants to connect to the base station is present. , Equipped with.
　本発明の一態様に係る基地局は、通信端末と通信する基地局であって、前記通信端末の位置情報を他の基地局から受信する第１の通信部と、前記位置情報に基づいて、自身の通信範囲への前記通信端末の接近を検出する制御部と、前記自身の通信範囲への接近が検出された場合、前記位置情報に基づいて、前記通信端末の周辺へ集中的に報知情報を送信する第２の通信部と、を備える。 The base station according to one aspect of the present invention is a base station that communicates with a communication terminal, and is based on a first communication unit that receives position information of the communication terminal from another base station and the position information. A control unit that detects the approach of the communication terminal to its own communication range, and when the approach to its own communication range is detected, information is intensively notified to the periphery of the communication terminal based on the position information. A second communication unit for transmitting the information is provided.
　本発明の一態様に係る通信端末は、第１の基地局および第２の基地局と通信する通信端末であって、前記通信端末の位置を示す位置情報を取得する位置情報取得部と、前記第２の基地局に接続したい旨および前記位置情報を前記第１の基地局に送信し、前記第２の基地局から報知情報を受信した場合、前記報知情報に基づいて、前記第２の基地局と通信を確立する通信部と、を備える。 The communication terminal according to one aspect of the present invention is a communication terminal that communicates with a first base station and a second base station, and includes a position information acquisition unit that acquires position information indicating the position of the communication terminal, and the above. When the intention to connect to the second base station and the position information are transmitted to the first base station and the broadcast information is received from the second base station, the second base is based on the broadcast information. It is equipped with a communication unit that establishes communication with the station.
第１の実施の形態に係る通信システムの構成図および処理の一例を示す図である。It is a figure which shows the block diagram and an example of processing of the communication system which concerns on 1st Embodiment. 第１の実施の形態に係るＬＴＥ基地局の構成図の一例である。It is an example of the block diagram of the LTE base station which concerns on 1st Embodiment. 第１の実施の形態に係るミリ波帯を用いたＮＲ基地局の構成図の一例である。This is an example of a configuration diagram of an NR base station using a millimeter wave band according to the first embodiment. 第１の実施の形態に係る通信端末の構成図の一例である。It is an example of the block diagram of the communication terminal which concerns on 1st Embodiment. 第１の実施の形態に係る制御処理のシーケンス図の一例である。It is an example of the sequence diagram of the control process which concerns on 1st Embodiment. 第１の実施の形態に係る通信システムの処理の変形例を示す図である。It is a figure which shows the modification of the processing of the communication system which concerns on 1st Embodiment. 第２の実施の形態に係る通信システムの構成図および処理の一例を示す図である。It is a figure which shows the block diagram and an example of processing of the communication system which concerns on 2nd Embodiment. 第２の実施の形態に係る制御処理のシーケンス図の一例である。It is an example of the sequence diagram of the control process which concerns on the 2nd Embodiment. 第３の実施の形態に係る通信システムの構成図および処理の一例を示す図である。It is a figure which shows the block diagram and an example of processing of the communication system which concerns on 3rd Embodiment. 第３の実施の形態に係る制御処理のシーケンス図の一例である。It is an example of the sequence diagram of the control process which concerns on 3rd Embodiment.
　以下、実施の形態について、図面を参照しつつ説明する。なお、図面については、同一又は同等の要素には同一の符号を付し、重複する説明は省略する。 Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.
（第１の実施の形態）
　図１は、第１の実施の形態に係る通信システムの構成図および処理の一例を示す図である。 (First Embodiment)
FIG. 1 is a diagram showing a configuration diagram and an example of processing of the communication system according to the first embodiment.
　通信システム１００は、ＬＴＥ基地局ｅＮＢ、ミリ波帯を用いたＮＲ基地局ｇＮＢ、および通信端末ＵＥを有する。ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢは、基幹ネットワークであるコアネットワーク（不図示）と接続し、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢは、コアネットワークを介して互いに通信可能である。 The communication system 100 has an LTE base station eNB, an NR base station gNB using a millimeter wave band, and a communication terminal UE. The LTE base station eNB and the NR base station gNB are connected to a core network (not shown) which is a backbone network, and the LTE base station eNB and the NR base station gNB can communicate with each other via the core network.
　ＬＴＥ基地局ｅＮＢは、ＬＴＥ基地局ｅＮＢが通信可能なエリアであるセル（ＬＴＥセル）１０１内の通信端末ＵＥとＬＴＥ（Long Term Evolution）で通信する。また、ＬＴＥ基地局ｅＮＢは、ＬＴＥ基地局ｅＮＢとの接続に用いられる情報を含む報知情報(System Information Block)を通信端末ＵＥに送信する。報知情報は、例えば、事業者を識別するためのPLMN（Public Land Mobile Network)、周波数を示すバンド番号、および基地局を選別するためのCell ID等の情報を含む。また、報知情報は、ＬＴＥ基地局ｅＮＢのセル１０１内にＮＲ基地局ｇＮＢが存在するか否かを示す情報（周辺基地局情報）を含む。ＬＴＥ基地局ｅＮＢは、第１の基地局の一例である。 The LTE base station eNB communicates with the communication terminal UE in the cell (LTE cell) 101, which is an area in which the LTE base station eNB can communicate, by LTE (Long Term Evolution). Further, the LTE base station eNB transmits broadcast information (System Information Block) including information used for connection with the LTE base station eNB to the communication terminal UE. The broadcast information includes, for example, information such as PLMN (Public Land Mobile Network) for identifying a business operator, a band number indicating a frequency, and Cell ID for selecting a base station. Further, the broadcast information includes information (peripheral base station information) indicating whether or not the NR base station gNB exists in the cell 101 of the LTE base station eNB. The LTE base station eNB is an example of a first base station.
　ＮＲ基地局ｇＮＢは、ＮＲ基地局ｇＮＢが、通信可能なエリアであるセル２０１（ミリ波帯ＮＲセル）内の通信端末ＵＥと５Ｇ　ＮＲ（Ｎｅｗ　Ｒａｄｉｏ）（以下、ＮＲと表記）で通信する。ＮＲでは、ＬＴＥの電波の周波数よりも高い周波数の電波が用いられる。具体的には、例えば、ＮＲ基地局ｇＮＢは、ＮＲにおいて、２４．２５ＧＨｚから５２．６ＧＨｚまでの周波数帯のミリ波（ｍｍＷ）で通信を行う。ＮＲは、第五世代移動通信システムの無線方式である。図１において、ＮＲ基地局ｇＮＢは、セル１０１内に設置されている。 The NR base station gNB communicates with the communication terminal UE in the cell 201 (millimeter wave band NR cell), which is a communicable area, by the NR base station gNB by 5G NR (New Radio) (hereinafter referred to as NR). In NR, a radio wave having a frequency higher than that of the LTE radio wave is used. Specifically, for example, the NR base station gNB communicates in NR with millimeter waves (mmW) in the frequency band from 24.25 GHz to 52.6 GHz. NR is a wireless system of the 5th generation mobile communication system. In FIG. 1, the NR base station gNB is installed in the cell 101.
　また、ＮＲ基地局ｇＮＢは、ビームフォーミングによってＮＲ基地局ｇＮＢから出力するビームを絞ることにより、ビームの到達距離を広げ、セル２０１よりも広い範囲のセル２０２内の通信端末ＵＥと通信可能である。 Further, the NR base station gNB can extend the reach of the beam by narrowing the beam output from the NR base station gNB by beamforming, and can communicate with the communication terminal UE in the cell 202 having a wider range than the cell 201. ..
　ＮＲ基地局ｇＮＢは、ミリ波を用いてＮＲ基地局ｇＮＢとの接続に用いられる情報を含む報知情報(System Information Block)を通信端末ＵＥに送信する。報知情報は、例えば、事業者を識別するためのPLMN（Public Land Mobile Network)、周波数を示すバンド番号、および基地局を選別するためのCell ID等の情報を含む。ＮＲ基地局ｇＮＢは、第２の基地局の一例である。 The NR base station gNB transmits broadcast information (System Information Block) including information used for connection with the NR base station gNB to the communication terminal UE using millimeter waves. The broadcast information includes, for example, information such as PLMN (Public Land Mobile Network) for identifying a business operator, a band number indicating a frequency, and Cell ID for selecting a base station. The NR base station gNB is an example of a second base station.
　通信端末ＵＥは、ＬＴＥおよびＮＲ（例えば、ミリ波）で通信可能な装置である。通信端末ＵＥは、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢと通信を行う。通信端末ＵＥは、ＬＴＥ基地局ｅＮＢから報知情報を受信し、報知情報に基づいて、ＬＴＥ基地局ｅＮＢとＬＴＥで通信を行う。また、通信端末ＵＥは、ＮＲ基地局ｇＮＢから報知情報を受信し、報知情報に基づいて、ＮＲを用いてＮＲ基地局ｇＮＢと通信を行う。通信端末ＵＥは、ＮＲによる通信を行うことにより、ＬＴＥを用いた通信に比べて高速な通信が可能となる。通信端末ＵＥは、例えば、スマートフォン、タブレット、またはラップトップ等の通信装置である。 The communication terminal UE is a device capable of communicating with LTE and NR (for example, millimeter wave). The communication terminal UE communicates with the LTE base station eNB and the NR base station gNB. The communication terminal UE receives the broadcast information from the LTE base station eNB, and communicates with the LTE base station eNB by LTE based on the broadcast information. Further, the communication terminal UE receives the broadcast information from the NR base station gNB and communicates with the NR base station gNB using the NR based on the broadcast information. By performing communication by NR, the communication terminal UE enables high-speed communication as compared with communication using LTE. The communication terminal UE is, for example, a communication device such as a smartphone, a tablet, or a laptop.
　通信システム１００における５Ｇのネットワークの運用形態には、ＮＳＡ（Non-StandAlone）モードとＳＡ（StandAlone）モードが存在する。ＮＳＡモードには、ＬＴＥを利用してＮＲを制御する形態がある。このようなＮＳＡモードでは、通信端末ＵＥは、ＬＴＥ基地局ｅＮＢとの間で制御情報の送受信を行うとともに、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢそれぞれとの間でデータの送受信を行う。ＳＡモードは、ＮＲ単独で動作する形態である。ＳＡモードでは、通信端末ＵＥは、ＮＲ基地局ｇＮＢとの間で制御情報およびデータの送受信を行う。実施の形態のＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥはＮＳＡモードに対応する。尚、実施の形態のＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥはＮＳＡモードとＳＡモードの両方に対応していてもよい。 There are NSA (Non-StandAlone) mode and SA (StandAlone) mode in the operation mode of the 5G network in the communication system 100. The NSA mode has a form in which NR is controlled by using LTE. In such an NSA mode, the communication terminal UE transmits and receives control information to and from the LTE base station eNB, and also transmits and receives data to and from each of the LTE base station eNB and the NR base station gNB. The SA mode is a form in which the NR operates alone. In the SA mode, the communication terminal UE transmits / receives control information and data to / from the NR base station gNB. The LTE base station eNB, the NR base station gNB, and the communication terminal UE of the embodiment correspond to the NSA mode. The LTE base station eNB, the NR base station gNB, and the communication terminal UE of the embodiment may support both the NSA mode and the SA mode.
　ここで、図１における通信システム１００の処理（ステップＳ１５１～Ｓ１５３）について簡単に説明する。 Here, the processing of the communication system 100 (steps S151 to S153) in FIG. 1 will be briefly described.
　図１において、通信端末ＵＥは、セル２０１の外側（範囲外）且つセル２０２の内側（範囲内）に位置する。ＮＲ基地局ｇＮＢが通常のビームフォーミングを行っている（所定の絞り具合でビーム絞っている）場合、通信範囲（カバレッジエリア）はセル２０１である。最初、ＮＲ基地局ｇＮＢは通常のビームフォーミングを行っており、通信端末ＵＥは、セル２０１の外側に位置するため、ＮＲ基地局ｇＮＢからの報知情報を受信（検出）できない。そのため、通信端末ＵＥは、最初、ＬＴＥ基地局ｅＮＢから報知情報を受信し、受信した報知情報に基づいて、ＬＴＥ基地局ｅＮＢと通信を確立する。 In FIG. 1, the communication terminal UE is located outside the cell 201 (outside the range) and inside the cell 202 (within the range). When the NR base station gNB is performing normal beamforming (beamforming is performed with a predetermined aperture), the communication range (coverage area) is cell 201. Initially, the NR base station gNB performs normal beamforming, and since the communication terminal UE is located outside the cell 201, it cannot receive (detect) the broadcast information from the NR base station gNB. Therefore, the communication terminal UE first receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information.
（ステップＳ１５１）
　通信端末ＵＥは、ＮＲ基地局ｇＮＢに接続すると判定した場合、ＮＲ基地局ｇＮＢに接続したい旨をＬＴＥ基地局ｅＮＢに通知する。例えば、通信端末ＵＥは、ＮＲ基地局ｇＮＢがＬＴＥ基地局ｅＮＢのセル１０１内に存在するが通信端末ＵＥがＮＲ基地局ｇＮＢと接続を確立していない場合、ＮＲ基地局ｇＮＢに接続すると判定する。また、通信端末ＵＥは、ユーザから高速通信の指示を受けた場合、または大きなサイズのデータをアップロードまたはダウンロードする大容量通信を行う場合などにＮＲ基地局ｇＮＢに接続すると判定してもよい。また、通信端末ＵＥは、端末装置ＵＥの位置情報に基づいて、通信端末ＵＥの位置がＮＲ基地局ｇＮＢのセル２０１と近い（例えば、通信端末ＵＥとＮＲ基地局ｇＮＢとの距離が所定値以下）と判定した場合にＮＲ基地局ｇＮＢに接続すると判定してもよい。このように、通信端末ＵＥは、ミリ波で通信したい（ＮＲ基地局ｇＮＢと接続したい）場合、言い換えれば高速通信を行いたい場合に、ＮＲ基地局ｇＮＢに接続すると判定する。さらに、通信端末ＵＥは、通信端末ＵＥの位置を示す位置情報をＬＴＥ基地局ｅＮＢに送信する。 (Step S151)
When the communication terminal UE determines that it is connected to the NR base station gNB, it notifies the LTE base station eNB that it wants to connect to the NR base station gNB. For example, the communication terminal UE determines that the NR base station gNB is connected to the NR base station gNB when the NR base station gNB exists in the cell 101 of the LTE base station eNB but the communication terminal UE has not established a connection with the NR base station gNB. .. Further, the communication terminal UE may determine to connect to the NR base station gNB when receiving an instruction for high-speed communication from a user or performing large-capacity communication for uploading or downloading large-sized data. Further, in the communication terminal UE, the position of the communication terminal UE is close to the cell 201 of the NR base station gNB based on the position information of the terminal device UE (for example, the distance between the communication terminal UE and the NR base station gNB is equal to or less than a predetermined value. ), It may be determined that the connection is made to the NR base station gNB. In this way, the communication terminal UE determines that it connects to the NR base station gNB when it wants to communicate in millimeter waves (when it wants to connect to the NR base station gNB), in other words, when it wants to perform high-speed communication. Further, the communication terminal UE transmits the position information indicating the position of the communication terminal UE to the LTE base station eNB.
（ステップＳ１５２）
　ＬＴＥ基地局ｅＮＢは、通信端末ＵＥからＮＲ基地局ｇＮＢに接続したい旨と位置情報を受信すると、接続したい通信端末がいる旨と通信端末ＵＥの位置情報をＮＲ基地局ｇＮＢに送信する。 (Step S152)
When the LTE base station eNB receives the position information that it wants to connect to the NR base station gNB from the communication terminal UE, it transmits the fact that there is a communication terminal that wants to connect and the position information of the communication terminal UE to the NR base station gNB.
（ステップＳ１５３）
　ＮＲ基地局ｇＮＢは、接続したい通信端末がいる旨を受信すると、報知情報の送信に用いるビームを現在の（所定の）絞り具合からさらに絞る。これにより、ビームの到達距離がセル２０１の範囲外に延び、セル２０２の範囲まで届くようになる。そして、ＮＲ基地局ｇＮＢは、受信した通信端末ＵＥの位置情報に基づいて、通信端末ＵＥの周辺を集中的にサーチする。すなわち、ＮＲ基地局ｇＮＢは、通信端末ＵＥの周辺に絞られたビームを集中的に送信することで、報知情報を送信する。 (Step S153)
When the NR base station gNB receives that there is a communication terminal to be connected to, the NR base station gNB further narrows the beam used for transmitting the broadcast information from the current (predetermined) aperture condition. As a result, the reach of the beam extends beyond the range of cell 201 and reaches the range of cell 202. Then, the NR base station gNB intensively searches the periphery of the communication terminal UE based on the received position information of the communication terminal UE. That is, the NR base station gNB transmits the broadcast information by intensively transmitting the beam focused around the communication terminal UE.
　これにより、絞られたビームにより報知情報が通信端末ＵＥに届き、通信端末ＵＥは報知情報を受信すると、報知情報に基づいて、ＮＲ基地局ｇＮＢとの通信を確立する。 As a result, the broadcast information reaches the communication terminal UE by the focused beam, and when the communication terminal UE receives the broadcast information, the communication with the NR base station gNB is established based on the broadcast information.
　尚、上述の通信システム１００の構成は、一例であり、ＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥのそれぞれの数や位置は、上述の構成に限られるものではない。 The configuration of the communication system 100 described above is an example, and the numbers and positions of the LTE base station eNB, the NR base station gNB, and the communication terminal UE are not limited to the above configuration.
　図２は、第１の実施の形態に係るＬＴＥ基地局の構成図の一例である。 FIG. 2 is an example of a configuration diagram of an LTE base station according to the first embodiment.
　ＬＴＥ基地局ｅＮＢは、制御部２１１、無線通信部２２１、ネットワーク通信部２３１、および記憶部２４１を有する。 The LTE base station eNB has a control unit 211, a wireless communication unit 221, a network communication unit 231 and a storage unit 241.
　制御部２１１は、ＬＴＥ基地局ｅＮＢの制御を行う。制御部２１１は、通信制御部２１２を有する。通信制御部２１２は、通信端末ＵＥとの通信、およびＮＲ基地局ｇＮＢとの通信を制御する。制御部２１１は、例えば、ＣＰＵ（Central Processing Unit）などのプロセッサである。 The control unit 211 controls the LTE base station eNB. The control unit 211 has a communication control unit 212. The communication control unit 212 controls communication with the communication terminal UE and communication with the NR base station gNB. The control unit 211 is, for example, a processor such as a CPU (Central Processing Unit).
　無線通信部２２１は、通信制御部２１２の制御により、無線通信部２２１と接続するアンテナ（不図示）を用いて、ＬＴＥで通信端末ＵＥと通信を行う。無線通信部２２１は、例えば、通信に伴うデータ変換等を行う通信インタフェースである。 The wireless communication unit 221 communicates with the communication terminal UE by LTE using an antenna (not shown) connected to the wireless communication unit 221 under the control of the communication control unit 212. The wireless communication unit 221 is, for example, a communication interface that performs data conversion and the like associated with communication.
　ネットワーク通信部２３１は、通信制御部２１２の制御により、ＮＲ基地局ｇＮＢとコアネットワーク（不図示）を介して通信を行う。ネットワーク通信部２３１は、例えば、通信に伴うデータ変換等を行う通信インタフェースである。 The network communication unit 231 communicates with the NR base station gNB via the core network (not shown) under the control of the communication control unit 212. The network communication unit 231 is, for example, a communication interface that performs data conversion and the like associated with communication.
　記憶部２４１は、ＬＴＥ基地局ｅＮＢで用いられるデータやプログラム等を記憶する。記憶部２４１は、例えば、ＨＤＤ（Hard Disk Drive）、ＲＡＭ（Random Access Memory）、またはフラッシュメモリ等の記憶装置である。 The storage unit 241 stores data, programs, etc. used in the LTE base station eNB. The storage unit 241 is, for example, a storage device such as an HDD (Hard Disk Drive), a RAM (Random Access Memory), or a flash memory.
　図３は、第１の実施の形態に係るミリ波帯を用いたＮＲ基地局の構成図の一例である。 FIG. 3 is an example of a configuration diagram of an NR base station using the millimeter wave band according to the first embodiment.
　ＮＲ基地局ｇＮＢは、制御部３１１、無線通信部３２１、ネットワーク通信部３３１、および記憶部３４１を有する。 The NR base station gNB has a control unit 311, a wireless communication unit 321 and a network communication unit 331, and a storage unit 341.
　制御部３１１は、ＮＲ基地局ｇＮＢの制御を行う。制御部３１１は、通信制御部３１２およびビーム制御部３１３を有する。通信制御部３１２は、通信端末ＵＥとの通信、およびＬＴＥ基地局ｅＮＢとの通信を制御する。ビーム制御部３１３は、無線通信部３２１が通信に用いるＮＲ（例えば、ミリ波）のビームの制御を行う。具体的には、例えば、ビーム制御部３１３は、ビームの絞り具合（電波の指向性）を制御する。例えば、ビーム制御部３１３は、特定の方向へのビームの到達距離が広がるように、ビームを絞る。ビームを絞るほど、すなわちビームの幅を狭くするほど、ビームの到達距離は広がる。このような、特定の方向に電波を集中的に送信する技術はビームフォーミングと呼ばれる。 The control unit 311 controls the NR base station gNB. The control unit 311 includes a communication control unit 312 and a beam control unit 313. The communication control unit 312 controls communication with the communication terminal UE and communication with the LTE base station eNB. The beam control unit 313 controls the beam of the NR (for example, millimeter wave) used by the wireless communication unit 321 for communication. Specifically, for example, the beam control unit 313 controls the degree of aperture of the beam (directivity of radio waves). For example, the beam control unit 313 narrows the beam so that the reach of the beam in a specific direction is widened. The narrower the beam, that is, the narrower the width of the beam, the wider the reach of the beam. Such a technique of intensively transmitting radio waves in a specific direction is called beamforming.
　無線通信部３２１は、通信制御部３１２の制御により、無線通信部３２１と接続するアンテナ（不図示）を用いて、ＮＲで通信端末ＵＥと通信を行う。また、無線通信部３２１は、ビーム制御部３１３の制御により絞られたＮＲのビームで通信端末ＵＥと通信を行ってもよい。無線通信部３２１は、例えば、通信に伴うデータ変換等を行う通信インタフェースである。無線通信部３２１は、第２の通信部の一例である。 The wireless communication unit 321 communicates with the communication terminal UE by NR using an antenna (not shown) connected to the wireless communication unit 321 under the control of the communication control unit 312. Further, the wireless communication unit 321 may communicate with the communication terminal UE with a beam of NR narrowed down by the control of the beam control unit 313. The wireless communication unit 321 is, for example, a communication interface that performs data conversion and the like associated with communication. The wireless communication unit 321 is an example of the second communication unit.
　ネットワーク通信部３３１は、通信制御部３１２の制御により、ＬＴＥ基地局ｅＮＢとコアネットワーク（不図示）を介して通信を行う。ネットワーク通信部３３１は、例えば、通信に伴うデータ変換等を行う通信インタフェースである。ネットワーク通信部３３１は、第１の通信部の一例である。 The network communication unit 331 communicates with the LTE base station eNB via the core network (not shown) under the control of the communication control unit 312. The network communication unit 331 is, for example, a communication interface that performs data conversion and the like associated with communication. The network communication unit 331 is an example of the first communication unit.
　記憶部３４１は、ＮＲ基地局ｇＮＢで用いられるデータやプログラム等を記憶する。記憶部３４１は、例えば、ＨＤＤ、ＲＡＭ、またはフラッシュメモリ等の記憶装置である。 The storage unit 341 stores data, programs, etc. used in the NR base station gNB. The storage unit 341 is, for example, a storage device such as an HDD, a RAM, or a flash memory.
　図４は、第１の実施の形態に係る通信端末の構成図の一例である。 FIG. 4 is an example of a configuration diagram of a communication terminal according to the first embodiment.
　通信端末ＵＥは、制御部４１１、位置取得部４２１、通信部２３１、および記憶部４４１を有する。 The communication terminal UE has a control unit 411, a position acquisition unit 421, a communication unit 231 and a storage unit 441.
　制御部４１１は、通信端末ＵＥの制御を行う。制御部４１１は、通信制御部４１２を有する。通信制御部４１２は、ＬＴＥ基地局ｅＮＢとの通信、およびＮＲ基地局ｇＮＢとの通信を制御する。制御部４１１は、例えば、ＣＰＵ等のプロセッサである。 The control unit 411 controls the communication terminal UE. The control unit 411 has a communication control unit 412. The communication control unit 412 controls communication with the LTE base station eNB and communication with the NR base station gNB. The control unit 411 is, for example, a processor such as a CPU.
　位置取得部４２１は、通信端末ＵＥの位置を示す位置情報を取得する。位置取得部４２１は、例えば、ＧＰＳ（Global Positioning System）を用いて通信端末ＵＥの位置を示す位置情報を取得する。また、位置取得部４２１は、例えば、ＬＴＥ基地局ｅＮＢから通信端末ＵＥの位置を示す位置情報（例えば、セルＩＤ）を取得してもよい。位置取得部４２１は、例えば、集積回路（ＩＣ（Integrated Circuit）チップ）等に形成された論理回路（ハードウェア）により実現される。 The position acquisition unit 421 acquires position information indicating the position of the communication terminal UE. The position acquisition unit 421 acquires position information indicating the position of the communication terminal UE by using, for example, GPS (Global Positioning System). Further, the position acquisition unit 421 may acquire position information (for example, cell ID) indicating the position of the communication terminal UE from the LTE base station eNB, for example. The position acquisition unit 421 is realized by, for example, a logic circuit (hardware) formed in an integrated circuit (IC (Integrated Circuit) chip) or the like.
　通信部２３１は、通信制御部４１２の制御により、通信部２３１と接続されるアンテナ（不図示）を用いて、ＬＴＥ基地局ｅＮＢとＬＴＥで通信を行う。さらに通信部２３１は、通信部２３１と接続されるアンテナ（不図示）を用いて、ＮＲ基地局ｇＮＢとＮＲ（例えば、ミリ波）で通信を行う。通信部２３１は、例えば、通信に伴うデータ変換等を行う通信インタフェースである。 The communication unit 231 communicates with the LTE base station eNB by LTE using an antenna (not shown) connected to the communication unit 231 under the control of the communication control unit 412. Further, the communication unit 231 communicates with the NR base station gNB by NR (for example, millimeter wave) using an antenna (not shown) connected to the communication unit 231. The communication unit 231 is, for example, a communication interface that performs data conversion and the like associated with communication.
　記憶部４４１は、通信端末ＵＥで用いられるデータやプログラム等を記憶する。記憶部３４１は、例えば、ＨＤＤ、ＲＡＭ、またはフラッシュメモリ等の記憶装置である。 The storage unit 441 stores data, programs, and the like used in the communication terminal UE. The storage unit 341 is, for example, a storage device such as an HDD, a RAM, or a flash memory.
　図５は、第１の実施の形態に係る制御処理のシーケンス図の一例である。 FIG. 5 is an example of a sequence diagram of the control process according to the first embodiment.
　先ず、ＮＲ基地局ｇＮＢの無線通信部３２１は、通常時は、所定の絞り具合のビームを用いて、予め設定されたＮＲ基地局ｇＮＢがビームを送信する全方向に周期的に報知情報を送信している。具体的には、例えば、無線通信部３２１は、通常時は、予め設定されたＮＲ基地局ｇＮＢがビームを送信する全方向に周期的にビームを送信、または予め設定されたＮＲ基地局ｇＮＢがビームを送信する全方向を複数の方向に分け、ビームの送出方向を変えて複数の方向のうちの１つ毎に順番に周期的にビーム送信して、ＮＲ基地局ｇＮＢの周りの予め設定されたＮＲ基地局ｇＮＢがビームを送信する全方向に均等にビームを送信する。無線通信部３２１は、ビームにより報知情報を送信する。通常時は、図１に示すようなセル２０１の範囲内に報知情報が送信される。 First, the wireless communication unit 321 of the NR base station gNB normally transmits broadcast information periodically in all directions in which the preset NR base station gNB transmits the beam by using a beam having a predetermined aperture. is doing. Specifically, for example, the wireless communication unit 321 normally transmits a beam periodically in all directions in which the preset NR base station gNB transmits the beam, or the preset NR base station gNB transmits the beam periodically. All directions of beam transmission are divided into a plurality of directions, the beam transmission direction is changed, and the beam is periodically transmitted in order for each one of the plurality of directions, and is preset around the NR base station gNB. The NR base station gNB transmits the beam evenly in all directions in which the beam is transmitted. The wireless communication unit 321 transmits the broadcast information by the beam. Normally, the broadcast information is transmitted within the range of the cell 201 as shown in FIG.
　また、通信端末ＵＥは、図１に示すように、セル２０１の範囲外に位置している。そのため、通信端末ＵＥは、ＮＲ基地局ｇＮＢからのＮＲのビームを検出していない状態であり、ＮＲ基地局ｇＮＢから報知情報を受信しておらず、ＮＲ基地局ｇＮＢと通信を確立していない。また、通信端末ＵＥは、セル１０１の範囲内にいるので、ＬＴＥ基地局ｅＮＢと通信可能である。 Further, as shown in FIG. 1, the communication terminal UE is located outside the range of the cell 201. Therefore, the communication terminal UE has not detected the NR beam from the NR base station gNB, has not received the broadcast information from the NR base station gNB, and has not established communication with the NR base station gNB. .. Further, since the communication terminal UE is within the range of the cell 101, it can communicate with the LTE base station eNB.
　ステップＳ５０１において、通信端末ＵＥの通信制御部４１２は、ＬＴＥ基地局ｅＮＢから報知情報を受信し、受信した報知情報に基づいてＬＴＥ基地局ｅＮＢと通信を確立する。そして、通信制御部４１２は、ＮＲ基地局ｇＮＢに接続すると判定する。例えば、通信制御部４１２は、ＮＲ基地局ｇＮＢと接続を確立していないので、ＮＲ基地局ｇＮＢに接続すると判定する。また、通信制御部４１２は、大容量の通信を開始する場合、またはユーザから高速通信の指示を受けた場合等に、ＮＲ基地局ｇＮＢに接続すると判定してもよい。また、通信制御部４１２は、通信端末ＵＥの位置がセル２０１と近い場合（通信端末ＵＥとセル２０１との間の距離が所定値以下の場合）に、ＮＲ基地局ｇＮＢに接続すると判定してもよい。 In step S501, the communication control unit 412 of the communication terminal UE receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information. Then, the communication control unit 412 determines that the connection is made to the NR base station gNB. For example, since the communication control unit 412 has not established a connection with the NR base station gNB, it determines that the connection is made with the NR base station gNB. Further, the communication control unit 412 may determine that the connection is made to the NR base station gNB when a large-capacity communication is started or when a user gives an instruction for high-speed communication. Further, the communication control unit 412 determines that the communication terminal UE is connected to the NR base station gNB when the position of the communication terminal UE is close to the cell 201 (when the distance between the communication terminal UE and the cell 201 is equal to or less than a predetermined value). May be good.
　ステップＳ５０２において、通信部４３１は、ＮＲ基地局ｇＮＢに接続すると判定されたので、ＮＲ基地局ｇＮＢに接続したい旨をＬＴＥ基地局ｅＮＢに通知する。ＬＴＥ基地局ｅＮＢの無線通信部２２１は、通信端末ＵＥからＮＲ基地局ｇＮＢに接続したい旨の通知を受信する。 In step S502, the communication unit 431 is determined to connect to the NR base station gNB, and therefore notifies the LTE base station eNB that it wants to connect to the NR base station gNB. The wireless communication unit 221 of the LTE base station eNB receives a notification from the communication terminal UE that it wants to connect to the NR base station gNB.
　ステップＳ５０３において、位置取得部４２１は、通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信する。そして、ＬＴＥ基地局ｅＮＢの無線通信部２２１は、通信端末ＵＥから位置情報を受信する。 In step S503, the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information from the communication terminal UE.
　ステップＳ５０４において、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲外にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、をＮＲ基地局ｇＮＢに送信する。そして、ＮＲ基地局ｇＮＢのネットワーク通信部３３１は、ＬＴＥ基地局ｅＮＢから、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲外にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、を受信する。 In step S504, the network communication unit 231 of the LTE base station eNB states that there is a communication terminal UE that wants to connect to the NR base station gNB outside the range of cell 201, which is the normal communication range of the NR base station gNB, and that the communication terminal UE And the position information of are transmitted to the NR base station gNB. Then, the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB from the LTE base station eNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB. , The position information of the communication terminal UE, and is received.
　ステップＳ５０５において、ビーム制御部３１３は、ネットワーク通信部３３１がＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲外にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報とを受信すると、無線通信部３２１が出力するビームを現在の絞り具合からさらに絞る。例えば、ビーム制御部３１３は、通信端末ＵＥの位置情報に基づいて、ビームの絞り具合を制御する。例えば、ビーム制御部３１３は、通信端末ＵＥの位置情報に基づいて、通信端末ＵＥの位置までビームが届く程度にビームを絞る。例えば、ビーム制御部３１３は、ＮＲ基地局ｇＮＢと通信端末ＵＥとの距離が長くなるほど、ビームに絞り具合を強くして、より遠くにビームが届くようにする。これにより、ビームの到達距離はビームを絞る前より長くなり、例えば、図１のセル２０１の範囲外にビームが届くようになり、セル２０２の範囲までビームが届くようになる。 In step S505, the beam control unit 313 indicates that the network communication unit 331 has a communication terminal UE that wants to connect to the NR base station gNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB, and the communication terminal UE. When the position information of the above is received, the beam output by the wireless communication unit 321 is further narrowed down from the current narrowing condition. For example, the beam control unit 313 controls the degree of aperture of the beam based on the position information of the communication terminal UE. For example, the beam control unit 313 narrows the beam to the extent that the beam reaches the position of the communication terminal UE based on the position information of the communication terminal UE. For example, the beam control unit 313 increases the aperture of the beam as the distance between the NR base station gNB and the communication terminal UE increases so that the beam can reach farther. As a result, the reach of the beam becomes longer than before the beam is narrowed down. For example, the beam reaches outside the range of cell 201 in FIG. 1, and the beam reaches the range of cell 202.
　ステップＳ５０６において、無線通信部３２１は、通信端末ＵＥの位置情報に基づいて、ステップＳ５０５でビーム制御部３１３により絞られたビームを用いて通信端末ＵＥの位置を含む周辺（例えば、通信端末ＵＥの位置を中心とした予め設定された半径Ｘメートルの範囲）へ集中的に報知情報を送信する。無線通信部３２１は、通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する場合は、例えば、ＮＲ基地局ｇＮＢから見て通信端末ＵＥのいる方向に対して報知情報を送信する周期を通信端末ＵＥのいない方向に対して報知情報を送信する周期よりも短くする。すなわち、ＮＲ基地局ｇＮＢから見て通信端末ＵＥのいる方向に対して報知情報を送信する頻度を高くする。または、無線通信部３２１は、通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する場合は、ＮＲ基地局ｇＮＢから見て通信端末ＵＥのいる方向に対して報知情報を送信する時間を通信端末ＵＥのいない方向に対して報知情報を送信する時間よりも長くしてもよい。これにより、報知情報が通信端末ＵＥに届き易くなる。 In step S506, the wireless communication unit 321 uses the beam focused by the beam control unit 313 in step S505 based on the position information of the communication terminal UE, and includes the position of the communication terminal UE in the periphery (for example, of the communication terminal UE). The broadcast information is intensively transmitted to a preset range (within a radius of X meters) centered on the position. When the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE, for example, the cycle of transmitting the broadcast information in the direction in which the communication terminal UE is as seen from the NR base station gNB. Is shorter than the cycle for transmitting broadcast information in the direction in which the communication terminal UE is not present. That is, the frequency of transmitting the broadcast information in the direction in which the communication terminal UE is located when viewed from the NR base station gNB is increased. Alternatively, when the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE, the time for transmitting the broadcast information in the direction in which the communication terminal UE is as seen from the NR base station gNB. May be longer than the time for transmitting the broadcast information in the direction in which the communication terminal UE is not present. This makes it easier for the broadcast information to reach the communication terminal UE.
　ステップＳ５０７において、通信端末ＵＥの通信部４３１は、ＮＲ基地局ｇＮＢから報知情報を受信する。 In step S507, the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB.
　ステップＳ５０８において、通信端末ＵＥの通信部４３１は、受信した報知情報に基づいて、ＮＲ基地局ｇＮＢと通信を確立する。 In step S508, the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB based on the received notification information.
　また、通信端末ＵＥの位置取得部４２１は、位置情報をＬＴＥ基地局ｅＮＢに送信しなくてもよく、ＮＲ基地局ｇＮＢは位置情報を受信せず、無線通信部３２１は、通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信しなくてもよい。ＮＲ基地局ｇＮＢが位置情報を受信しない場合、無線通信部３２１は、ビームの送信方向を変えながら、ＮＲ基地局ｇＮＢの周りの各方向に均等の間隔で周期的に絞られたビームにより報知情報を送信してもよい。 Further, the position acquisition unit 421 of the communication terminal UE does not have to transmit the position information to the LTE base station eNB, the NR base station gNB does not receive the position information, and the wireless communication unit 321 is the position of the communication terminal UE. It is not necessary to intensively transmit the notification information to the surroundings including. When the NR base station gNB does not receive the position information, the radio communication unit 321 changes the transmission direction of the beam, and broadcast information by the beam periodically narrowed in each direction around the NR base station gNB at equal intervals. May be sent.
　第１の実施の形態の通信システムよれば、ＮＲ基地局ｇＮＢの通常のセル２０１の範囲外にいる通信端末ＵＥと通信を確立できる。このように、第１の実施の形態の通信システムよれば、ＮＲ基地局ｇＮＢと通信端末ＵＥ間の通信を確立できる距離を延ばすことができる。それにより、通信端末ＵＥがＮＲ基地局ｇＮＢの通常のセル２０１の範囲外にいる場合でも、通信端末ＵＥとＮＲ基地局ｇＮＢとの通信が確立しやすくなる。 According to the communication system of the first embodiment, communication can be established with a communication terminal UE outside the range of the normal cell 201 of the NR base station gNB. As described above, according to the communication system of the first embodiment, it is possible to extend the distance at which communication can be established between the NR base station gNB and the communication terminal UE. As a result, even when the communication terminal UE is outside the range of the normal cell 201 of the NR base station gNB, communication between the communication terminal UE and the NR base station gNB can be easily established.
　図６は、第１の実施の形態に係る通信システムの処理の変形例を示す図である。 FIG. 6 is a diagram showing a modified example of the processing of the communication system according to the first embodiment.
　図６の通信システム１００において、通信端末ＵＥ１は、セル２０２の範囲の外側且つセル２０３の範囲内にある。この場合、ビーム制御部３１３は、通信端末ＵＥ１の位置情報に基づいて、通信端末がセル２０２内にいる場合よりもさらにビームを絞り、セル２０３の範囲（すなわちセル２０２の範囲外）までビームが届くようにする。ビーム制御部３１３は、位置情報に基づいて、通信端末ＵＥとＮＲ基地局ｇＮＢとの距離が長くなるほど、ビームを絞り（ビームの幅を狭くし）、より遠くにビームが到達するようにする。 In the communication system 100 of FIG. 6, the communication terminal UE1 is outside the range of the cell 202 and within the range of the cell 203. In this case, the beam control unit 313 narrows the beam further than when the communication terminal is in the cell 202 based on the position information of the communication terminal UE1, and the beam extends to the range of the cell 203 (that is, outside the range of the cell 202). Make it reachable. Based on the position information, the beam control unit 313 narrows the beam (narrows the width of the beam) as the distance between the communication terminal UE and the NR base station gNB increases, so that the beam reaches farther.
　また、図６の通信システム１００において、通信端末ＵＥ２、ＵＥ３は、セル１０１の範囲外且つセル２０２の範囲内にあり、さらに通信端末ＵＥ２と通信端末ＵＥ３との間の距離は近い。 Further, in the communication system 100 of FIG. 6, the communication terminals UE2 and UE3 are outside the range of the cell 101 and within the range of the cell 202, and the distance between the communication terminal UE2 and the communication terminal UE3 is short.
　ビーム制御部３１３は、ネットワーク通信部３３１がＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲外にＮＲ基地局ｇＮＢに接続したい複数の通信端末ＵＥ２，ＵＥ３がいる旨と、通信端末ＵＥ２、ＵＥ３の位置情報とを受信すると、無線通信部３２１が出力するビームを絞る。この場合、複数の通信端末ＵＥ２，ＵＥ３がセル２０１の範囲外にあるので、ビームを少し絞る。この場合、ビームの幅は、上記のようなセル２０２の範囲外の通信端末ＵＥ１に対してビームを届ける場合より広くなり、通信端末ＵＥ２と通信端末ＵＥ３の両方にビームが届き易くなる。 The beam control unit 313 tells that the network communication unit 331 has a plurality of communication terminals UE2 and UE3 that the network communication unit 331 wants to connect to the NR base station gNB outside the range of the cell 201, which is the normal communication range of the NR base station gNB, and the communication terminal UE2. When the position information of the UE 3 is received, the beam output by the wireless communication unit 321 is narrowed down. In this case, since the plurality of communication terminals UE2 and UE3 are outside the range of the cell 201, the beam is narrowed a little. In this case, the width of the beam becomes wider than the case where the beam is delivered to the communication terminal UE1 outside the range of the cell 202 as described above, and the beam can easily reach both the communication terminal UE2 and the communication terminal UE3.
　また、通信端末ＵＥの位置情報の精度が悪く、通信端末ＵＥのおおよその位置しか分からない場合は、ビーム制御部３１３は、ビームの絞り具合を制御して、通信端末ＵＥの詳細の位置が分かる場合よりも、ビームの絞り具合を弱く、すなわち通信端末ＵＥの詳細の位置が分かる場合のビームの幅より広くしてもよい。 Further, when the accuracy of the position information of the communication terminal UE is poor and only the approximate position of the communication terminal UE is known, the beam control unit 313 controls the degree of aperture of the beam to know the detailed position of the communication terminal UE. The aperture of the beam may be weaker than in the case, that is, wider than the width of the beam when the detailed position of the communication terminal UE is known.
　このように、ビーム制御部３１３は、通信端末ＵＥの数または通信端末ＵＥとＮＲ基地局ｇＮＢとの距離に応じて、ビームの絞り具合（電波の指向性）を制御して、ビームの到達距離および幅を変更することで、通信端末ＵＥにビームが届き易くすることができる。 In this way, the beam control unit 313 controls the beam focusing degree (radio wave directivity) according to the number of communication terminal UEs or the distance between the communication terminal UE and the NR base station gNB, and the reach distance of the beam. And by changing the width, it is possible to make it easier for the beam to reach the communication terminal UE.
（第２の実施の形態）
　通信端末ＵＥがミリ波帯ＮＲセル内にいることが分かっており、ＳＡモードで動作したい場合に、通信端末ＵＥが最初からＮＲ基地局ｇＮＢと接続しようとしても、街の中では障害物等による減衰により、ＮＲ基地局ｇＮＢからのＮＲが通信端末ＵＥに届きにくく、ＮＲ基地局ｇＮＢに接続しづらい場合がある。第２の実施の形態では、通信端末ＵＥがミリ波帯ＮＲセル内にいるのでＳＡモードで動作したいが、ＮＲ基地局ｇＮＢから電波が届きにくく接続できない場合に、最初にＬＴＥ基地局ｇＮＢに接続してからＮＲ基地局ｇＮＢに接続する。そして、通信端末ＵＥは、ＮＳＡモードの状態からＬＴＥをリリース（ＬＴＥ基地局ｇＮＢとの通信を切断）して最初の希望通りにＳＡモードで動作してもよい。尚、通信システムはＬＴＥをリリースせずにＮＳＡモードのままで運用してもよい。 (Second Embodiment)
It is known that the communication terminal UE is in the millimeter wave band NR cell, and when the communication terminal UE wants to operate in SA mode, even if the communication terminal UE tries to connect to the NR base station gNB from the beginning, it is caused by obstacles in the city. Due to the attenuation, it may be difficult for the NR from the NR base station gNB to reach the communication terminal UE, and it may be difficult to connect to the NR base station gNB. In the second embodiment, since the communication terminal UE is in the millimeter wave band NR cell, it is desired to operate in the SA mode, but when the radio wave is difficult to reach from the NR base station gNB and the connection cannot be made, the LTE base station gNB is connected first. Then connect to the NR base station gNB. Then, the communication terminal UE may release LTE from the state of NSA mode (disconnect communication with the LTE base station gNB) and operate in SA mode as initially desired. The communication system may be operated in the NSA mode without releasing LTE.
　図７は、第２の実施の形態に係る通信システムの構成図および処理の一例を示す図である。 FIG. 7 is a diagram showing a configuration diagram and an example of processing of the communication system according to the second embodiment.
　通信システム２００は、ＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥを有する。 The communication system 200 has an LTE base station eNB, an NR base station gNB, and a communication terminal UE.
　第２の実施の形態のＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥの構成は、図２～４で示した第１の実施の形態のＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥの構成とそれぞれ同様であるため、詳細な説明は省略する。 The configurations of the LTE base station eNB, the NR base station gNB, and the communication terminal UE of the second embodiment are the LTE base station eNB, the NR base station gNB, and the NR base station gNB of the first embodiment shown in FIGS. Since the configuration is the same as that of the communication terminal UE, detailed description thereof will be omitted.
　ここで、図７における通信システム２００の処理（ステップＳ７０１～Ｓ７０３）について簡単に説明する。 Here, the processing of the communication system 200 (steps S701 to S703) in FIG. 7 will be briefly described.
　図７において、通信端末ＵＥは、セル２０１の範囲内に位置する。通信端末ＵＥは、図７に示すように、セル２０１の範囲内に位置しているが、見通し環境ではなく（すなわち、通信端末ＵＥの周囲に障害物が多く、ＮＲ基地局ｇＮＢからのＮＲ（例えば、ミリ波）が通信端末ＵＥに届きにくい状況）、ＮＲ基地局ｇＮＢからのＮＲを検出していない状態である。 In FIG. 7, the communication terminal UE is located within the range of cell 201. As shown in FIG. 7, the communication terminal UE is located within the range of the cell 201, but is not in the line-of-sight environment (that is, there are many obstacles around the communication terminal UE, and the NR from the NR base station gNB (that is,) For example, millimeter waves) are difficult to reach the communication terminal UE), and NR from the NR base station gNB is not detected.
（ステップＳ７０１）
　先ず、通信端末ＵＥは、ＮＲ基地局ｇＮＢから報知情報を受信できていないため、ＬＴＥ基地局ｅＮＢと通信を確立する。そして、通信端末ＵＥは、ＮＲ基地局ｇＮＢに接続したい旨と通信端末ＵＥの位置情報をＬＴＥ基地局ｅＮＢに送信する。ＬＴＥ基地局ｅＮＢは、ＮＲ基地局ｇＮＢに接続したい旨と通信端末ＵＥの位置情報を受信する。 (Step S701)
First, since the communication terminal UE has not received the broadcast information from the NR base station gNB, it establishes communication with the LTE base station eNB. Then, the communication terminal UE transmits to the LTE base station eNB that it wants to connect to the NR base station gNB and the position information of the communication terminal UE. The LTE base station eNB receives the fact that it wants to connect to the NR base station gNB and the position information of the communication terminal UE.
（ステップＳ７０２）
　ＬＴＥ基地局ｅＮＢは、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲内にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、をＮＲ基地局ｇＮＢに送信する。そして、ＮＲ基地局ｇＮＢのネットワーク通信部３３１は、ＬＴＥ基地局ｅＮＢから、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲内にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、を受信する。 (Step S702)
The LTE base station eNB determines that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of cell 201, which is the normal communication range of the NR base station gNB, and the position information of the communication terminal UE. Send to gNB. Then, the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of the cell 201, which is the normal communication range of the NR base station gNB, from the LTE base station eNB. , The position information of the communication terminal UE, and is received.
（ステップＳ７０３）
　ＮＲ基地局ｇＮＢは、通信端末ＵＥの位置情報に基づいて、ビームを用いて通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する。この時、ＮＲ基地局ｇＮＢは、ビームフォーミングによりビームを絞ってもよい。通信端末ＵＥは、ＮＲ基地局ｇＮＢから報知情報を受信すると、受信した報知情報に基づいて、ＮＲ基地局ｇＮＢと通信を確立する。 (Step S703)
Based on the position information of the communication terminal UE, the NR base station gNB uses a beam to intensively transmit the broadcast information to the periphery including the position of the communication terminal UE. At this time, the NR base station gNB may narrow the beam by beamforming. When the communication terminal UE receives the broadcast information from the NR base station gNB, the communication terminal UE establishes communication with the NR base station gNB based on the received broadcast information.
　この後、通信端末ＵＥは、ＬＴＥをリリースして、ＳＡモードで動作してもよい。 After this, the communication terminal UE may release LTE and operate in SA mode.
　図８は、第２の実施の形態に係る制御処理のシーケンス図の一例である。 FIG. 8 is an example of a sequence diagram of the control process according to the second embodiment.
　先ず、通信端末ＵＥは、図７に示すように、セル２０１の範囲内に位置しているが、見通し環境ではなく、ＮＲ基地局ｇＮＢからのＮＲを検出していない状態である。また、通信端末ＵＥは、セル１０１の範囲内にいるので、ＬＴＥ基地局ｅＮＢと通信可能である。 First, as shown in FIG. 7, the communication terminal UE is located within the range of the cell 201, but is not in the line-of-sight environment and is in a state where the NR from the NR base station gNB is not detected. Further, since the communication terminal UE is within the range of the cell 101, it can communicate with the LTE base station eNB.
　ステップＳ８０１において、通信端末ＵＥの通信制御部４１２は、ＬＴＥ基地局ｅＮＢから報知情報を受信し、受信した報知情報に基づいて、ＬＴＥ基地局ｅＮＢと通信を確立する。そして、通信制御部４１２は、ＮＲ基地局ｇＮＢに接続すると判定する。例えば、通信制御部４１２は、ＮＲ基地局ｇＮＢがＬＴＥ基地局ｅＮＢのセル１０１内に存在するがＮＲ基地局ｇＮＢと接続を確立していないので、ＮＲ基地局ｇＮＢに接続すると判定する。また、通信制御部４１２は、大容量の通信を開始する場合、またはユーザから高速通信の指示を受けた場合等に、ＮＲ基地局ｇＮＢに接続すると判定してもよい。また、通信制御部４１２は、通信端末ＵＥの位置がセル２０１の範囲内にいる場合、ＮＲ基地局ｇＮＢに接続すると判定してもよい。 In step S801, the communication control unit 412 of the communication terminal UE receives the broadcast information from the LTE base station eNB, and establishes communication with the LTE base station eNB based on the received broadcast information. Then, the communication control unit 412 determines that the connection is made to the NR base station gNB. For example, the communication control unit 412 determines that the NR base station gNB is connected to the NR base station gNB because the NR base station gNB exists in the cell 101 of the LTE base station eNB but the connection with the NR base station gNB has not been established. Further, the communication control unit 412 may determine that the connection is made to the NR base station gNB when a large-capacity communication is started or when a user gives an instruction for high-speed communication. Further, the communication control unit 412 may determine that the communication terminal UE is connected to the NR base station gNB when the position of the communication terminal UE is within the range of the cell 201.
　ステップＳ８０２において、通信部４３１は、ＮＲ基地局ｇＮＢに接続すると判定されたので、ＮＲ基地局ｇＮＢに接続したい旨をＬＴＥ基地局ｅＮＢに通知する。ＬＴＥ基地局ｅＮＢの無線通信部２２１は、通信端末ＵＥからＮＲ基地局ｇＮＢに接続したい旨の通知を受信する。 In step S802, the communication unit 431 is determined to connect to the NR base station gNB, and therefore notifies the LTE base station eNB that it wants to connect to the NR base station gNB. The wireless communication unit 221 of the LTE base station eNB receives a notification from the communication terminal UE that it wants to connect to the NR base station gNB.
　ステップＳ８０３において、位置取得部４２１は、通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信する。そして、ＬＴＥ基地局ｅＮＢの無線通信部２２１は、通信端末ＵＥから位置情報を受信する。 In step S803, the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information from the communication terminal UE.
　ステップＳ８０４において、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲内にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、をＮＲ基地局ｇＮＢに送信する。そして、ＮＲ基地局ｇＮＢのネットワーク通信部３３１は、ＬＴＥ基地局ｅＮＢから、ＮＲ基地局ｇＮＢの通常の通信範囲であるセル２０１の範囲内にＮＲ基地局ｇＮＢに接続したい通信端末ＵＥがいる旨と、通信端末ＵＥの位置情報と、を受信する。 In step S804, the network communication unit 231 of the LTE base station eNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of cell 201, which is the normal communication range of the NR base station gNB, and that the communication terminal UE And the position information of are transmitted to the NR base station gNB. Then, the network communication unit 331 of the NR base station gNB states that there is a communication terminal UE that wants to connect to the NR base station gNB within the range of the cell 201, which is the normal communication range of the NR base station gNB, from the LTE base station eNB. , The position information of the communication terminal UE, and is received.
　ステップＳ８０６において、無線通信部３２１は、通信端末ＵＥの位置情報に基づいて、ビームを用いて通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する。 In step S806, the wireless communication unit 321 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE by using the beam based on the position information of the communication terminal UE.
　ステップＳ８０７において、通信端末ＵＥの通信部４３１は、ＮＲ基地局ｇＮＢから報知情報を受信する。 In step S807, the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB.
　ステップＳ８０８において、通信端末ＵＥの通信部４３１は、受信した報知情報に基づいて、ＮＲ基地局ｇＮＢと通信を確立する。 In step S808, the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB based on the received notification information.
　ステップＳ８０９において、ＮＲ基地局ｇＮＢの無線通信部３２１は、ＬＴＥのリリースの指示を通信端末ＵＥに送信してもよい。通信端末ＵＥの通信部４３１は、ＬＴＥのリリースの指示を受信すると、ＬＴＥをリリースし、通信端末ＵＥはＳＡモードで動作する。 In step S809, the wireless communication unit 321 of the NR base station gNB may transmit an LTE release instruction to the communication terminal UE. Upon receiving the LTE release instruction, the communication unit 431 of the communication terminal UE releases LTE, and the communication terminal UE operates in the SA mode.
　第２の実施の形態の通信システムよれば、通信端末ＵＥがＮＲ基地局ｇＮＢの通常のセル２０１の範囲内にいるが見通し環境でない場合に、通信端末ＵＥの周囲に集中的に報知情報を送信することで、通信端末ＵＥとＮＲ基地局ｇＮＢとの通信を確立しやすくなる。特にミリ波帯を用いたＮＲ基地局ｇＮＢがローカル５Ｇの運用であり、ＭＣＣ（Mobile Country Code）やＭＮＣ（Mobile Network Code）が異なる場合等に特に効果的である。 According to the communication system of the second embodiment, when the communication terminal UE is within the range of the normal cell 201 of the NR base station gNB but is not in the line-of-sight environment, the broadcast information is intensively transmitted around the communication terminal UE. This makes it easier to establish communication between the communication terminal UE and the NR base station gNB. This is particularly effective when the NR base station gNB using the millimeter wave band is a local 5G operation and the MCC (Mobile Country Code) and MNC (Mobile Network Code) are different.
（第３の実施の形態）
　第３の実施の形態では、第１のＮＲ基地局ｇＮＢ１と接続を確立中の通信端末ＵＥが移動することにより、第１のＮＲ基地局ｇＮＢ１のセルの範囲外に出て、第２のＮＲ基地局ｇＮＢ２のセルに接近または第２のＮＲ基地局ｇＮＢ２のセルの範囲内に入る場合に、第２のＮＲ基地局ｇＮＢ２との接続の確立を容易にする。 (Third Embodiment)
In the third embodiment, the communication terminal UE that is establishing a connection with the first NR base station gNB1 moves, so that the communication terminal UE moves out of the range of the cell of the first NR base station gNB1 and the second NR. When approaching the cell of the base station gNB2 or entering the range of the cell of the second NR base station gNB2, it facilitates the establishment of a connection with the second NR base station gNB2.
　図９は、第３の実施の形態に係る通信システムの構成図および処理の一例を示す図である。 FIG. 9 is a diagram showing a configuration diagram and an example of processing of the communication system according to the third embodiment.
　通信システム３００は、ＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ１、ｇＮＢ２、および通信端末ＵＥを有する。ＬＴＥ基地局ｅＮＢの通信範囲はセル１０１であり、ＮＲ基地局ｇＮＢ１、ｇＮＢ２の通常時の通信範囲は、それぞれセル２０１－１、２０１－２である。 The communication system 300 has an LTE base station eNB, an NR base station gNB1, gNB2, and a communication terminal UE. The communication range of the LTE base station eNB is cell 101, and the normal communication range of the NR base stations gNB1 and gNB2 is cells 211-1 and 201-2, respectively.
　第３の実施の形態のＬＴＥ基地局ｅＮＢ、ミリ波帯を用いたＮＲ基地局ｇＮＢ１、ｇＮＢ２、および通信端末ＵＥの構成は、図２～４で示した第１の実施の形態のＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥの構成とそれぞれ同様であるため、詳細な説明は省略する。 The configuration of the LTE base station eNB of the third embodiment, the NR base stations gNB1 and gNB2 using the millimeter wave band, and the communication terminal UE is the LTE base station of the first embodiment shown in FIGS. Since the configurations are the same as those of the eNB, the NR base station gNB, and the communication terminal UE, detailed description thereof will be omitted.
　ここで、図９における通信システム３００の処理（ステップＳ９０１～Ｓ９０９）について簡単に説明する。 Here, the processing of the communication system 300 (steps S901 to S909) in FIG. 9 will be briefly described.
　図９において、最初、通信端末ＵＥは、セル２０１－１の範囲内に位置する。 In FIG. 9, the communication terminal UE is initially located within the range of cell 201-1.
（ステップＳ９０１）
　先ず、通信端末ＵＥは、図１０に示すようなＮＲ基地局ｇＮＢ１のセル２０１－１の範囲内にあり、ＮＲ基地局ｇＮＢ１と通信を確立中である。 (Step S901)
First, the communication terminal UE is within the range of cell 211-1 of the NR base station gNB1 as shown in FIG. 10, and is establishing communication with the NR base station gNB1.
（ステップＳ９０２）
　また、通信端末ＵＥは、ＬＴＥ基地局ｅＮＢのセル１０１の範囲内にあり、ＬＴＥ基地局ｅＮＢと通信を確立している。通信端末ＵＥは、通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信する。 (Step S902)
Further, the communication terminal UE is within the range of cell 101 of the LTE base station eNB, and has established communication with the LTE base station eNB. The communication terminal UE acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB.
（ステップＳ９０３）
　通信端末ＵＥは、セル２０１－１の範囲内から出て、ＮＲ基地局ｇＮＢ２の方向に移動する。 (Step S903)
The communication terminal UE exits the range of cell 211-1 and moves in the direction of the NR base station gNB2.
（ステップＳ９０４）
　ＮＲ基地局ｇＮＢ１は、通信端末ＵＥがセル２０１－１の端に移動すると、通信端末ＵＥがセル２０１-１の範囲外に出ると判定し、通信端末ＵＥがセル２０１-１の範囲外に出る旨をＬＴＥ基地局ｅＮＢに通知する。さらに、ＮＲ基地局ｇＮＢ１は、ＮＲのリリースの指示を通信端末ＵＥに送信し、通信端末ＵＥは、ＮＲのリリースの指示を受信すると、ＮＲをリリースする。 (Step S904)
The NR base station gNB1 determines that when the communication terminal UE moves to the end of cell 201-1, the communication terminal UE goes out of the range of cell 201-1, and the communication terminal UE goes out of the range of cell 201-1. Notify the LTE base station eNB to that effect. Further, the NR base station gNB1 transmits an instruction to release the NR to the communication terminal UE, and the communication terminal UE releases the NR when receiving the instruction to release the NR.
（ステップＳ９０５）
　通信端末ＵＥは、セル２０１－１の範囲内から出ても、セル１０１の範囲内にあり、ＬＴＥ基地局ｅＮＢと通信を確立したままである。通信端末ＵＥは、通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信している。 (Step S905)
The communication terminal UE is within the range of the cell 101 even if it comes out of the range of the cell 211-1, and the communication with the LTE base station eNB remains established. The communication terminal UE acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB.
（ステップＳ９０６）
　ＬＴＥ基地局ｅＮＢは、通信端末ＵＥの進行方向にあるセル２０１－２のＮＲ基地局ｇＮＢ２に通信端末ＵＥの位置情報を送信する。 (Step S906)
The LTE base station eNB transmits the position information of the communication terminal UE to the NR base station gNB2 in cell 201-2 in the traveling direction of the communication terminal UE.
（ステップＳ９０７）
　通信端末ＵＥは、ＮＲ基地局ｇＮＢ２の方向に移動し、ＮＲ基地局ｇＮＢ２のセル２０１－２に接近し、その後、セル２０１－２の範囲内に入る。 (Step S907)
The communication terminal UE moves in the direction of the NR base station gNB2, approaches the cell 201-2 of the NR base station gNB2, and then enters the range of the cell 201-2.
（ステップＳ９０８）
　ＮＲ基地局ｇＮＢ２は、ＮＲ基地局ｇＮＢ２の通信範囲であるセル２０１－２への通信端末ＵＥの接近を検出すると、ビームを用いて通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する。 (Step S908)
When the NR base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, which is the communication range of the NR base station gNB2, the NR base station gNB2 uses a beam to intensively transmit the broadcast information to the surroundings including the position of the communication terminal UE. do.
（ステップＳ９０９）
　通信端末ＵＥは、ＮＲ基地局ｇＮＢ２から報知情報を受信し、受信した報知情報に基づいて、ＮＲ基地局ｇＮＢ２と通信を確立する。 (Step S909)
The communication terminal UE receives broadcast information from the NR base station gNB2 and establishes communication with the NR base station gNB2 based on the received broadcast information.
　第３の実施の形態の通信システム３００では、通信端末ＵＥがＮＲ基地局ｇＮＢ１のセル２０１－１を抜けて、ＮＲ基地局ｇＮＢ２のセル２０１－２に移動する場合に、ＮＲ基地局ｇＮＢ２は、通信端末ＵＥの接近を検出して、集中的に報知情報を通信端末ＵＥに送信することで、通信端末ＵＥはＮＲ基地局ｇＮＢ２との接続を確立しやすくなる。 In the communication system 300 of the third embodiment, when the communication terminal UE exits the cell 211-1 of the NR base station gNB1 and moves to the cell 201-2 of the NR base station gNB2, the NR base station gNB2 By detecting the approach of the communication terminal UE and centrally transmitting the broadcast information to the communication terminal UE, the communication terminal UE can easily establish a connection with the NR base station gNB2.
　図１０は、第３の実施の形態に係る制御処理のシーケンス図の一例である。 FIG. 10 is an example of a sequence diagram of control processing according to the third embodiment.
　先ず、通信端末ＵＥは、図１０に示すようなＬＴＥ基地局ｅＮＢのセル１０１の範囲内且つＮＲ基地局ｇＮＢ１のセル２０１－１の範囲内にあり、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢ１それぞれから報知情報を受信し、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢ１それぞれと通信を確立しており、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢ１それぞれと通信可能である。 First, the communication terminal UE is within the range of cell 101 of the LTE base station eNB and within the range of cell 211-1 of the NR base station gNB1 as shown in FIG. 10, from each of the LTE base station eNB and the NR base station gNB1. It receives the broadcast information and establishes communication with each of the LTE base station eNB and the NR base station gNB1, and can communicate with each of the LTE base station eNB and the NR base station gNB1.
　ステップＳ１００１において、通信部４３１は、ＬＴＥ基地局ｅＮＢおよびＮＲ基地局ｇＮＢ１と通信を確立中である。 In step S1001, the communication unit 431 is establishing communication with the LTE base station eNB and the NR base station gNB1.
　ステップＳ１００２において、位置取得部４２１は、通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信する。さらに、通信制御部４１２は、ＮＲ基地局ｇＮＢ１から受信している電波（ＮＲ）の受信レベルを検出し、通信部４３１は、受信レベルをＬＴＥ基地局ｅＮＢに送信する。そして、ＬＴＥ基地局ｅＮＢの無線通信部２２１は、通信端末ＵＥから位置情報および受信レベルを受信する。以降、位置取得部４２１は、位置情報を継続的にＬＴＥ基地局ｅＮＢに送信する。すなわち、位置取得部４２１は、常にまたは定期的に通信端末ＵＥの位置を示す位置情報を取得し、位置情報をＬＴＥ基地局ｅＮＢに送信する。また、以降、通信部４３１は、受信レベルを継続的にＬＴＥ基地局ｅＮＢに送信する。すなわち、通信制御部４１２は、ＮＲ基地局ｇＮＢ１から受信している電波の受信レベルを常にまたは定期的に検出し、通信部４３１は、常にまたは定期的に受信レベルをＬＴＥ基地局ｅＮＢに送信する。 In step S1002, the position acquisition unit 421 acquires the position information indicating the position of the communication terminal UE and transmits the position information to the LTE base station eNB. Further, the communication control unit 412 detects the reception level of the radio wave (NR) received from the NR base station gNB1, and the communication unit 431 transmits the reception level to the LTE base station eNB. Then, the wireless communication unit 221 of the LTE base station eNB receives the position information and the reception level from the communication terminal UE. After that, the position acquisition unit 421 continuously transmits the position information to the LTE base station eNB. That is, the position acquisition unit 421 constantly or periodically acquires the position information indicating the position of the communication terminal UE, and transmits the position information to the LTE base station eNB. Further, thereafter, the communication unit 431 continuously transmits the reception level to the LTE base station eNB. That is, the communication control unit 412 constantly or periodically detects the reception level of the radio wave received from the NR base station gNB1, and the communication unit 431 constantly or periodically transmits the reception level to the LTE base station eNB. ..
　ステップＳ１００３において、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、通信端末ＵＥから受信した通信端末ＵＥの位置情報および受信レベルを通信端末ＵＥと接続を確立中のＮＲ基地局ｇＮＢ１に送信する。尚、通信端末ＵＥがどのＮＲ基地局と通信を確立中であるかの情報は、ＬＴＥ基地局ｅＮＢが通信端末ＵＥから受信する、または通信端末ＵＥと接続を確立中のＮＲ基地局から受信する。そして、ＮＲ基地局ｇＮＢ１のネットワーク通信部３３１は、ＬＴＥ基地局ｅＮＢから、通信端末ＵＥの位置情報および受信レベルを受信する。そして、ＮＲ基地局ｇＮＢ１の通信制御部３１２は、受信した位置情報および受信レベルをチェックし、受信レベルが予め定められた閾値以下であるか否かにより、通信端末ＵＥがセル２０１-１の範囲外に出るか否か判定する。例えば、ＮＲ基地局ｇＮＢ１の通信制御部３１２は、受信レベルが予め定められた閾値以下である場合、通信端末ＵＥがセル２０１-１の範囲外に出ると判定する。また、以降、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、通信端末ＵＥから受信した通信端末ＵＥの位置情報および受信レベルを継続的にＮＲ基地局ｇＮＢ１に送信する。 In step S1003, the network communication unit 231 of the LTE base station eNB transmits the position information and reception level of the communication terminal UE received from the communication terminal UE to the NR base station gNB1 which is establishing a connection with the communication terminal UE. Information on which NR base station the communication terminal UE is establishing communication with is received from the NR base station that the LTE base station eNB receives from the communication terminal UE or from the NR base station that is establishing a connection with the communication terminal UE. .. Then, the network communication unit 331 of the NR base station gNB1 receives the position information and the reception level of the communication terminal UE from the LTE base station eNB. Then, the communication control unit 312 of the NR base station gNB1 checks the received position information and the reception level, and depending on whether or not the reception level is equal to or less than a predetermined threshold value, the communication terminal UE sets the range of the cell 201-1. Determine if you want to go out. For example, the communication control unit 312 of the NR base station gNB1 determines that the communication terminal UE goes out of the range of cells 201-1 when the reception level is equal to or less than a predetermined threshold value. Further, thereafter, the network communication unit 231 of the LTE base station eNB continuously transmits the position information and the reception level of the communication terminal UE received from the communication terminal UE to the NR base station gNB1.
　ここで、通信端末ＵＥがセル２０１-１内において、ＮＲ基地局ｇＮＢ１から離れる方向に移動し、セル２０１-１の端に移動したとする。これにより、通信端末ＵＥにおいて、ＮＲ基地局ｇＮＢ１から受信している電波の受信レベルが低下し、受信レベルは定められた閾値以下となる。 Here, it is assumed that the communication terminal UE moves in the cell 201-1 in the direction away from the NR base station gNB1 and moves to the end of the cell 201-1. As a result, in the communication terminal UE, the reception level of the radio wave received from the NR base station gNB1 is lowered, and the reception level becomes equal to or lower than the predetermined threshold value.
　ステップＳ１００４において、ＮＲ基地局ｇＮＢ１の通信制御部３１２は、通信端末ＵＥで検出されたＮＲ基地局ｇＮＢ１からの電波の受信レベルが予め定められた閾値以下となったので、通信端末ＵＥがセル２０１-１の範囲外に出ると判定する。例えば、図９に示すように、通信端末ＵＥは、セル２０１-１の範囲内の点線で囲まれた位置から、ＮＲ基地局ｇＮＢ２がある方向に移動して、セル２０１-１の範囲から出る。 In step S1004, the communication control unit 312 of the NR base station gNB1 has set the reception level of the radio wave from the NR base station gNB1 detected by the communication terminal UE to be equal to or lower than a predetermined threshold value, so that the communication terminal UE is set to the cell 201. Judged to be out of the range of -1. For example, as shown in FIG. 9, the communication terminal UE moves from the position surrounded by the dotted line in the range of the cell 211-1 in the direction in which the NR base station gNB2 is located, and exits the range of the cell 211-1. ..
　ステップＳ１００５において、ＮＲ基地局ｇＮＢ１の無線通信部３２１は、通信端末ＵＥがセル２０１-１を出る旨をＬＴＥ基地局ｅＮＢに通知する。 In step S1005, the radio communication unit 321 of the NR base station gNB1 notifies the LTE base station eNB that the communication terminal UE leaves the cell 201-1.
　ステップＳ１００６において、ＮＲ基地局ｇＮＢ１の無線通信部３２１は、ＮＲのリリースの指示を通信端末ＵＥに送信する。通信端末ＵＥの通信部４３１は、ＮＲのリリースの指示を受信すると、ＮＲをリリースする。 In step S1006, the radio communication unit 321 of the NR base station gNB1 transmits an instruction to release the NR to the communication terminal UE. When the communication unit 431 of the communication terminal UE receives the instruction to release the NR, the communication unit 431 releases the NR.
　ステップＳ１００７において、通信端末ＵＥの通信部４３１は、ステップＳ１００６でＮＲをリリースして、ＮＲ基地局ｇＮＢ１と通信を切断したが、依然としてＬＴＥ基地局ｅＮＢと通信を確立中である。 In step S1007, the communication unit 431 of the communication terminal UE released the NR in step S1006 and disconnected the communication with the NR base station gNB1, but the communication with the LTE base station eNB is still being established.
　ステップＳ１００８において、通信端末ＵＥがセル２０１－２の近くまたはセル２０１－２の範囲内に移動する。尚、ステップＳ１００２で述べたように、通信端末ＵＥの位置情報は継続的にＬＴＥ基地局ｅＮＢに送信されている。 In step S1008, the communication terminal UE moves near cell 201-2 or within the range of cell 201-2. As described in step S1002, the position information of the communication terminal UE is continuously transmitted to the LTE base station eNB.
　ステップＳ１００９において、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、ステップＳ１００５で送信された通信端末ＵＥがセル２０１-１を出る旨を受信すると、通信端末ＵＥの位置情報に基づいて、通信端末ＵＥの周囲のＮＲ基地局ｇＮＢ２に位置情報を送信する。通信端末ＵＥの周囲のＮＲ基地局は、例えば、通信端末ＵＥが出ると判定されたセル２０１－１のＮＲ基地局ｇＮＢ１以外のＮＲ基地局のうち、通信端末ＵＥの進行方向にあるセル２０１－２のＮＲ基地局ｇＮＢ２である。尚、ＬＴＥ基地局ｅＮＢの通信制御部２１２は、例えば、現在から所定時間前の通信端末ＵＥの位置情報と現在の通信端末の位置情報から通信端末ＵＥの進行方向を算出し、ＬＴＥ基地局ｅＮＢの記憶部２４１に記憶されているＮＲ基地局ｇＮＢ１、ｇＮＢ２の位置を示す基地局位置情報に基づいて、通信端末ＵＥの進行方向にあるセル２０１－２のＮＲ基地局ｇＮＢ２を検出する。以降、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、通信端末ＵＥから受信した通信端末ＵＥの位置情報を継続的にＮＲ基地局ｇＮＢ２に送信する。また、ＬＴＥ基地局ｅＮＢのネットワーク通信部２３１は、通信端末ＵＥから受信した受信レベルを継続的にＮＲ基地局ｇＮＢ２にさらに送信してもよい。 In step S1009, when the network communication unit 231 of the LTE base station eNB receives that the communication terminal UE transmitted in step S1005 leaves the cell 201-1, the network communication unit 231 of the communication terminal UE is based on the position information of the communication terminal UE. Position information is transmitted to the surrounding NR base station gNB2. The NR base stations around the communication terminal UE are, for example, the cells 201-in the traveling direction of the communication terminal UE among the NR base stations other than the NR base station gNB1 of the cell 211-1 determined to output the communication terminal UE. 2 NR base station gNB2. The communication control unit 212 of the LTE base station eNB calculates, for example, the traveling direction of the communication terminal UE from the position information of the communication terminal UE before a predetermined time from the present and the position information of the current communication terminal, and the LTE base station eNB Based on the base station position information indicating the positions of the NR base stations gNB1 and gNB2 stored in the storage unit 241 of the communication terminal UE, the NR base station gNB2 of the cell 201-2 in the traveling direction of the communication terminal UE is detected. After that, the network communication unit 231 of the LTE base station eNB continuously transmits the position information of the communication terminal UE received from the communication terminal UE to the NR base station gNB2. Further, the network communication unit 231 of the LTE base station eNB may continuously further transmit the reception level received from the communication terminal UE to the NR base station gNB2.
　また、通信端末ＵＥの周囲のＮＲ基地局は、例えば、通信端末ＵＥが出ると判定されたセル２０１-１のＮＲ基地局ｇＮＢ１以外のＮＲ基地局のうち、通信端末ＵＥから一番近いＮＲ基地局ｇＮＢ２、または通信端末ＵＥとの距離が所定の値以下のＮＲ基地局ｇＮＢ２であってもよい。 Further, the NR base stations around the communication terminal UE are, for example, the NR bases closest to the communication terminal UE among the NR base stations other than the NR base station gNB1 in the cell 201-1 determined to output the communication terminal UE. The station gNB2 or the NR base station gNB2 whose distance from the communication terminal UE may be equal to or less than a predetermined value may be used.
　ステップＳ１０１０において、ＮＲ基地局ｇＮＢ２の通信制御部２１２は、通信端末ＵＥの位置情報に基づいて、自身（ＮＲ基地局ｇＮＢ２）の通信範囲であるセル２０１－２への通信端末ＵＥの接近を検出する。通信制御部２１２は、例えば、位置情報に基づいて、通信端末ＵＥとＮＲ基地局ｇＮＢ２との距離を算出し、算出した距離が所定値以下である場合、セル２０１－２へ通信端末ＵＥが接近したと検出する。また、例えば、記憶部３４１にセル２０１－２の範囲を示す情報が記憶されており、通信制御部２１２は、セル２０１－２の範囲を示す情報と位置情報に基づいて、セル２０１－２と通信端末ＵＥとの距離を算出し、算出した距離が所定値以下である場合、セル２０１－２へ通信端末ＵＥが接近したと検出してもよい。また、例えば、通信制御部２１２は、セル２０１－２の範囲を示す情報と位置情報に基づいて、通信端末ＵＥがセル２０１－２の範囲内にいる場合、セル２０１－２へ通信端末ＵＥが接近したと検出してもよい。 In step S1010, the communication control unit 212 of the NR base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, which is the communication range of itself (NR base station gNB2), based on the position information of the communication terminal UE. do. For example, the communication control unit 212 calculates the distance between the communication terminal UE and the NR base station gNB2 based on the position information, and when the calculated distance is equal to or less than a predetermined value, the communication terminal UE approaches cell 201-2. It is detected that it has been done. Further, for example, the storage unit 341 stores information indicating the range of the cell 201-2, and the communication control unit 212 sets the cell 201-2 based on the information indicating the range of the cell 201-2 and the position information. The distance to the communication terminal UE is calculated, and if the calculated distance is equal to or less than a predetermined value, it may be detected that the communication terminal UE has approached cell 201-2. Further, for example, when the communication terminal UE is within the range of the cell 201-2, the communication control unit 212 sends the communication terminal UE to the cell 201-2 based on the information indicating the range of the cell 201-2 and the position information. It may be detected as approaching.
　ステップＳ１０１１において、ＮＲ基地局ｇＮＢ２の無線通信部３２１は、通信端末ＵＥの位置情報に基づいて、ビームを用いて通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信する。尚、集中的に報知情報を送信する方法は、第１の実施の形態と同様である。 In step S1011, the wireless communication unit 321 of the NR base station gNB2 intensively transmits the broadcast information to the periphery including the position of the communication terminal UE using a beam based on the position information of the communication terminal UE. The method of intensively transmitting the notification information is the same as that of the first embodiment.
　ステップＳ１０１２において、通信端末ＵＥがセル２０２－２の範囲内に入るとすぐに、通信端末ＵＥの通信部４３１は、ＮＲ基地局ｇＮＢ２から報知情報を受信する。 In step S1012, as soon as the communication terminal UE enters the range of cell 202-2, the communication unit 431 of the communication terminal UE receives the broadcast information from the NR base station gNB2.
　ステップＳ１０１３において、通信端末ＵＥの通信部４３１は、受信した報知情報に基づいて、ＮＲ基地局ｇＮＢ２と通信を確立する。 In step S1013, the communication unit 431 of the communication terminal UE establishes communication with the NR base station gNB2 based on the received notification information.
　第３の実施の形態の通信システムよれば、通信端末ＵＥが通信を確立中のＮＲ基地局ｇＮＢ１のセル２０１－１から出て、別のＮＲ基地局ｇＮＢ２のセル２０１－２に入る場合、ＮＲ基地局ｇＮＢ２は、セル２０１－２への通信端末ＵＥの接近を検出し、通信端末ＵＥの周辺へ集中的に報知情報を送信する。それにより、通信端末ＵＥがセル２０１－２へ入るとすぐに報知情報を受信でき、通信端末ＵＥとＮＲ基地局ｇＮＢ２との通信の確立がしやすくなる。 According to the communication system of the third embodiment, when the communication terminal UE exits cell 211-1 of the NR base station gNB1 for which communication is being established and enters cell 201-2 of another NR base station gNB2, the NR The base station gNB2 detects the approach of the communication terminal UE to the cell 201-2, and intensively transmits the broadcast information to the periphery of the communication terminal UE. As a result, the broadcast information can be received as soon as the communication terminal UE enters the cell 201-2, and it becomes easy to establish communication between the communication terminal UE and the NR base station gNB2.
　尚、上述のステップＳ１０１１の前に、ＮＲ基地局ｇＮＢ２のビーム制御部３１３は、ＮＲ基地局ｇＮＢ２の通信制御部３１２によりセル２０２－２への通信端末ＵＥの接近が検出されると、無線通信部３２１が出力するビームを現在の絞り具合からさらに絞ってもよい。ＮＲ基地局ｇＮＢ２のビーム制御部３１３は、例えば、第１の実施の形態と同様に、位置情報に基づいて、ビームを絞る。そして、ステップＳ１０１１において、ＮＲ基地局ｇＮＢ２の無線通信部３２１は、通信端末ＵＥの位置情報に基づいて、ビーム制御部３１３により絞られたビームを用いて通信端末ＵＥの位置を含む周辺へ集中的に報知情報を送信してもよい。これにより、無線通信部３２１は、通信端末ＵＥがセル２０２－２に接近し、通信端末ＵＥがセル２０２－２の範囲内に入る前に、すなわち通信端末ＵＥがセル２０２－２の範囲外にいる場合でも、報知情報を届けることができる。 Prior to step S1011 described above, when the beam control unit 313 of the NR base station gNB2 detects the approach of the communication terminal UE to the cell 202-2 by the communication control unit 312 of the NR base station gNB2, wireless communication is performed. The beam output by the unit 321 may be further narrowed from the current narrowing condition. The beam control unit 313 of the NR base station gNB2 narrows the beam based on the position information, for example, as in the first embodiment. Then, in step S1011, the wireless communication unit 321 of the NR base station gNB2 concentrates on the periphery including the position of the communication terminal UE by using the beam focused by the beam control unit 313 based on the position information of the communication terminal UE. The notification information may be transmitted to. As a result, in the wireless communication unit 321, before the communication terminal UE approaches the cell 202-2 and the communication terminal UE enters the range of the cell 202-2, that is, the communication terminal UE moves out of the range of the cell 202-2. Even if there is, the notification information can be delivered.
（ソフトウェアによる実現例）
　ＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥの制御ブロック（特に、制御部２１１、３１１、４１１）は、集積回路（ＩＣ（Integrated Circuit）チップ）等に形成された論理回路（ハードウェア）によって実現可能であり、またＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。後者の場合、ＬＴＥ基地局ｅＮＢ、ＮＲ基地局ｇＮＢ、および通信端末ＵＥは、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラムおよび各種データがコンピュータ（またはＣＰＵ）で読み取り可能に記録されたＲＯＭまたは記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ等を備えている。そして、コンピュータ（またはＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、制御部２１１、３１１、４１１として動作し、本発明の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路等を用いることができる。また、上記プログラムは、伝送可能な任意の伝送媒体を介して上記コンピュータに供給されてよい。 (Example of realization by software)
The control blocks (particularly, control units 211, 311 and 411) of the LTE base station eNB, the NR base station gNB, and the communication terminal UE are logic circuits (hardware) formed in an integrated circuit (IC (Integrated Circuit) chip) or the like. ), And may be realized by software using a CPU (Central Processing Unit). In the latter case, the LTE base station eNB, the NR base station gNB, and the communication terminal UE are a CPU that executes instructions of a program that is software that realizes each function, and the above program and various data can be read by a computer (or CPU). It is provided with a ROM or storage device (these are referred to as "recording media") recorded in the program, a RAM for developing the above program, and the like. Then, when the computer (or CPU) reads the program from the recording medium and executes it, it operates as the control units 211, 311 and 411, and the object of the present invention is achieved. As the recording medium, a "non-temporary tangible medium", for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, the program may be supplied to the computer via any transmission medium capable of transmitting.
　なお、本発明は、上述した実施の形態に限定されるものではなく変形可能であり、上記の構成は、実質的に同一の構成、同一の作用効果を奏する構成又は同一の目的を達成することができる構成で置き換えることができる。 It should be noted that the present invention is not limited to the above-described embodiment, but can be modified, and the above-mentioned configuration achieves substantially the same configuration, a configuration exhibiting the same action and effect, or the same object. Can be replaced with a configuration that allows.

Claims (8)

  1. 　通信端末と通信する基地局であって、
    　前記基地局に接続したい前記通信端末がいる旨を他の基地局から受信する第１の通信部と、
    　前記基地局に接続したい前記通信端末がいる旨を前記第１の通信部が受信した場合に、ビームを絞るビーム制御部と、
    　前記通信端末へ報知情報を前記絞られたビームを用いて送信する第２の通信部と、
    　を備える基地局。     A base station that communicates with a communication terminal
    A first communication unit that receives from another base station that there is a communication terminal that wants to connect to the base station, and
    A beam control unit that narrows the beam when the first communication unit receives that there is a communication terminal that wants to connect to the base station.
    A second communication unit that transmits notification information to the communication terminal using the narrowed beam, and
    Base station with.
  2. 　前記第１の通信部は、前記通信端末の位置情報を前記他の基地局からさらに受信し、
    　前記第２の通信部は、前記位置情報に基づいて、前記報知情報を送信する請求項１記載の基地局。     The first communication unit further receives the position information of the communication terminal from the other base station, and receives the position information of the communication terminal.
    The base station according to claim 1, wherein the second communication unit transmits the broadcast information based on the location information.
  3. 　前記第２の通信部は、前記位置情報に基づいて、前記通信端末の周辺へ集中的に前記報知情報を送信する請求項２記載の基地局。 The base station according to claim 2, wherein the second communication unit centrally transmits the broadcast information to the periphery of the communication terminal based on the location information.
  4. 　前記ビーム制御部は、前記位置情報に基づいて、前記ビームの絞り具合を制御する請求項２または３記載の基地局。 The base station according to claim 2 or 3, wherein the beam control unit controls the degree of aperture of the beam based on the position information.
  5. 　前記基地局はＮＲ（New Radio）を用いて前記通信端末と通信を行い、
    　前記他の基地局は、ＬＴＥ（Long Term Evolution）を用いて前記通信端末と通信を行う請求項１から４のいずれか１項に記載の基地局。     The base station communicates with the communication terminal using NR (New Radio), and then communicates with the communication terminal.
    The base station according to any one of claims 1 to 4, wherein the other base station communicates with the communication terminal using LTE (Long Term Evolution).
  6. 　通信端末と通信する基地局であって、
    　前記基地局に接続したい前記通信端末がいる旨および前記通信端末の位置情報を他の基地局から受信する第１の通信部と、
    　前記基地局に接続したい前記通信端末がいる旨を受信した場合、前記位置情報に基づいて、前記通信端末の周辺へ集中的に報知情報を送信する第２の通信部と、
    　を備える基地局。     A base station that communicates with a communication terminal
    A first communication unit that receives the fact that there is a communication terminal that wants to connect to the base station and the position information of the communication terminal from another base station, and
    When it is received that the communication terminal to be connected to the base station is present, the second communication unit that intensively transmits the notification information to the periphery of the communication terminal based on the position information, and the second communication unit.
    Base station with.
  7. 　通信端末と通信する基地局であって、
    　前記通信端末の位置情報を他の基地局から受信する第１の通信部と、
    　前記位置情報に基づいて、自身の通信範囲への前記通信端末の接近を検出する制御部と、
    　前記自身の通信範囲への前記通信端末の接近が検出された場合、前記位置情報に基づいて、前記通信端末の周辺へ集中的に報知情報を送信する第２の通信部と、
    　を備える基地局。     A base station that communicates with a communication terminal
    A first communication unit that receives the position information of the communication terminal from another base station, and
    A control unit that detects the approach of the communication terminal to its own communication range based on the position information, and
    When the approach of the communication terminal to the own communication range is detected, the second communication unit that intensively transmits the notification information to the periphery of the communication terminal based on the position information, and the second communication unit.
    Base station with.
  8. 　第１の基地局および第２の基地局と通信する通信端末であって、
    　前記通信端末の位置を示す位置情報を取得する位置情報取得部と、
    　前記第２の基地局に接続したい旨および前記位置情報を前記第１の基地局に送信し、前記第２の基地局から報知情報を受信した場合、前記報知情報に基づいて、前記第２の基地局と通信を確立する通信部と、
    　を備える通信端末。     A communication terminal that communicates with a first base station and a second base station.
    A location information acquisition unit that acquires location information indicating the location of the communication terminal, and
    When the user wants to connect to the second base station and the position information is transmitted to the first base station and the broadcast information is received from the second base station, the second base station is based on the broadcast information. The communication unit that establishes communication with the base station,
    Communication terminal equipped with.
PCT/JP2021/030752 2021-01-18 2021-08-23 Base station and communication terminal WO2022153584A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-005754 2021-01-18
JP2021005754 2021-01-18

Publications (1)

Publication Number Publication Date
WO2022153584A1 true WO2022153584A1 (en) 2022-07-21

Family

ID=82447046

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/030752 WO2022153584A1 (en) 2021-01-18 2021-08-23 Base station and communication terminal

Country Status (1)

Country Link
WO (1) WO2022153584A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002204470A (en) * 2000-12-28 2002-07-19 Mitsubishi Electric Corp Wireless communication system, communication control method for the wireless communication system and its management method
JP2015053615A (en) * 2013-09-06 2015-03-19 株式会社Ｎｔｔドコモ Synchronization method, mobile station device and base station device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002204470A (en) * 2000-12-28 2002-07-19 Mitsubishi Electric Corp Wireless communication system, communication control method for the wireless communication system and its management method
JP2015053615A (en) * 2013-09-06 2015-03-19 株式会社Ｎｔｔドコモ Synchronization method, mobile station device and base station device

Similar Documents

Publication Publication Date Title
US9918348B2 (en) Device-to-device relay selection
EP3282755B1 (en) Relay node switching method and system
WO2021098063A1 (en) Methods and systems for transmitting integrated access and backhaul information
KR102213110B1 (en) Beacon apparatus for seamless service, and control method thereof
TWI433503B (en) Mobile device, base stations, backhaul network device, and method and computer program product for the mobile device
US10159023B2 (en) Network node, access nodes and method for assisting user equipments to receive signals in wireless communication network
EP3294030B1 (en) System information transmission methods, base station, and user equipment
CN114080062B (en) Relay UE reselection method, medium and equipment
CN104081831A (en) Method and apparatus for selecting an access point based on direction of movement
EP3193529B1 (en) Communication apparatus, method of controlling the same, and communication system
KR20140012102A (en) Method and system of providing small cell information to user equipments in a heterogeneous network environment
EP3220691B1 (en) Network node selection and activation method and apparatus
JP5712078B2 (en) Wireless communication terminal, wireless communication control method for wireless communication terminal, and wireless communication server
CN114080003B (en) Method and device for accessing network
WO2022153584A1 (en) Base station and communication terminal
JP2012244309A (en) Mobile communication method, mobile station, core network device, and radio base station
WO2021193106A1 (en) Terminal, communication system, and control method
KR20170002199A (en) METHOD OF Performing communication IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF
WO2013089766A1 (en) Changing the machine-to-machine (m2m) group of an m2m device
WO2024142619A1 (en) Control device, control method, and program
JP2023142610A (en) Mobile station and local base station
US9155034B1 (en) Wireless Communication Device and method for hand-up from less-capable to more-capable communication protocol
US20170006438A1 (en) Processing of message beacons in a wireless device
US20240089820A1 (en) Method and user equipment (ue) for provisioning ue procedures for network slicing
WO2016041589A1 (en) Communications in a wireless system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21919476

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21919476

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP