WO2023112097A1 - Control method, control device, and radio communication system - Google Patents

Control method, control device, and radio communication system Download PDF

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Publication number
WO2023112097A1
WO2023112097A1 PCT/JP2021/045880 JP2021045880W WO2023112097A1 WO 2023112097 A1 WO2023112097 A1 WO 2023112097A1 JP 2021045880 W JP2021045880 W JP 2021045880W WO 2023112097 A1 WO2023112097 A1 WO 2023112097A1
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WIPO (PCT)
Prior art keywords
base station
distance
user terminal
mobile base
control device
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PCT/JP2021/045880
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French (fr)
Japanese (ja)
Inventor
聡 高谷
俊朗 中平
大輔 村山
貴庸 守山
Original Assignee
日本電信電話株式会社
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Priority to PCT/JP2021/045880 priority Critical patent/WO2023112097A1/en
Publication of WO2023112097A1 publication Critical patent/WO2023112097A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H04W16/20—Network planning tools for indoor coverage or short range network deployment

Definitions

  • the present invention relates to control methods, control devices, and wireless communication systems.
  • Wireless network control technology has been proposed that dynamically forms wireless communication areas according to communication requests, propagation environments, etc., using a plurality of mobile base stations each having a wireless base station installed in a mobile device (for example, See Non-Patent Document 1).
  • Non-Patent Document 1 With the technology disclosed in Non-Patent Document 1, it is possible to optimize the arrangement of mobile base stations according to changes in the radio environment. cannot solve the problem of becoming
  • Embodiments of the present invention have been made in view of the above problems, and facilitate maintenance of a radio link when a user terminal moves in a radio communication system including mobile base stations.
  • a control method provides a control device for controlling a mobile base station having a radio base station mounted on a mobile device, wherein the mobile base station and the mobile base station are wirelessly connected to the mobile base station.
  • a first calculation process for calculating a distance between the mobile base station and the user terminal; and a distance between the mobile base station and the user terminal.
  • a movement instruction process for instructing the movable base station to move so that the distance is equal to or less than a preset first distance.
  • FIG. 11 is a diagram (1) for explaining an outline of processing according to the present embodiment
  • FIG. 2 is a diagram (2) for explaining an overview of processing according to the present embodiment
  • FIG. 3 is a diagram (3) for explaining an outline of processing according to the present embodiment
  • FIG. 4 is a diagram (4) for explaining an outline of processing according to the present embodiment
  • 5 is a flow chart showing an example of processing of the control device according to the first embodiment
  • FIG. 4 is a diagram for explaining a first distance and a second distance according to Example 1;
  • FIG. 11 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment
  • FIG. 2B is a diagram (2) for explaining an example of a method of selecting a movement candidate point according to the first embodiment
  • 10 is a flow chart showing an example of processing of the control device according to the second embodiment
  • FIG. 10 is a diagram showing an image of processing of the wireless communication system according to the second embodiment
  • It is a figure which shows the example of the hardware constitutions of the control apparatus which concerns on this embodiment, a mobile base station, and a user terminal.
  • FIG. 1 is a diagram showing an example of the system configuration of a radio communication system according to this embodiment.
  • a radio communication system 1 includes a plurality of mobile base stations 100-1, 100-2, 100-3, . 100-3, . . .
  • mobile base station 100 is used when referring to an arbitrary mobile base station among the plurality of mobile base stations 100-1, 100-2, 100-3, . . .
  • Mobile base station 100 is a radio base station that performs predetermined radio communication such as 5G (5th. Generation) and LTE (Long Term Evolution) with user terminal 102 used by a user who uses radio communication system 1.
  • Movable base station 100 is communicably connected to control device 10 and is configured to be able to move within a predetermined range around a reference point in accordance with instructions from control device 10 .
  • mobile base station 100-1 moves within a predetermined range centered on a reference point, thereby establishing wireless communication with user terminal 102 within coverage area 101-1 of mobile base station 100-1. It can be carried out.
  • the mobile base station 100-2 performs wireless communication with the user terminal 102 within the coverage area 101-2
  • the mobile base station 100-3 communicates with the user terminal 102 within the coverage area 101-2. Wireless communication is possible.
  • the control device 10 is a device that controls multiple mobile base stations 100 or a system that includes multiple devices.
  • the control device 10 acquires position information from the mobile base station 100 and the user terminal 102, and moves the mobile base station so that the distance between the mobile base station 100 and the user terminal 102 is within a predetermined distance.
  • a user terminal 102 is a radio station used by a user, and is a mobile base station 100 with the best communication quality among a plurality of mobile base stations 100-1, 100-2, 100-3, . . . Connect by communication.
  • the movable base station 100 is preset with a distance (hereinafter referred to as a first distance D1) at which a predetermined communication quality is obtained, based on measurement data measured in advance, design values, or the like.
  • This first distance D1 can be determined, for example, based on the following formula (1).
  • the first distance D1 can be obtained so that the propagation loss L is equal to or less than a predetermined value in the frequency band used by the radio communication system 1.
  • the first distance D1 is not limited to this, and may be obtained by a method other than the formula (1).
  • control device 10 instructs mobile base station 100-1 to move so that the distance between mobile base station 100-1 and user terminal 102 is equal to or less than first distance D1 (see FIG. 2).
  • step S2 mobile base station 100-1, for example, as shown in FIG. 3, follows and moves to a point where the distance between mobile base station 100-1 and user terminal 102 is within the first distance.
  • control device 10 moves the mobile base station 100-1 so that the distance between the mobile base station 100-1 and the user terminal 102 is within the first distance D1. can obtain good communication quality within the coverage area 101-1.
  • control device 10 instructs mobile base station 100-2 to move so that the distance between other mobile base station 100-2 and user terminal 102 is within the first distance (FIG. 4). step S5).
  • mobile base station 100-2 follows and moves to a point where the distance between mobile base station 100-2 and user terminal 102 is within the first distance (see FIG. 5). 5 step S6).
  • the control device 10 performs the same processing for the mobile base station 100-3.
  • the control device 10 instructs the mobile base station 100, which is movable to a point within the first distance from the user terminal 102, to determine the distance between the mobile base station 100 and the user terminal 102. is within the first distance.
  • the radio communication system 1 including the mobile base station 100 it becomes easy to maintain the radio link when the user terminal 102 moves.
  • FIG. 6 is a diagram showing an example of the functional configuration of the radio communication system according to this embodiment.
  • mobile base stations 100-2 and 100-3 are assumed to have the same functional configuration as mobile base station 100-1.
  • the control device 10 has a configuration of a computer, and when the computer executes a predetermined program, for example, a communication unit 601, an acquisition unit 602, a first calculation unit 603, a second calculation unit 604, a movement It implements an instruction unit 605, an information management unit 606, a storage unit 607, and the like. It should be noted that at least part of the functional configurations described above may be realized by hardware.
  • the communication unit 601 executes communication processing for communicating with the mobile base station 100. Also, the communication unit 601 can communicate with the user terminal 102 directly or via the mobile base station 100, for example.
  • the acquisition unit 602 executes acquisition processing for acquiring location information of the mobile base station 100 and the user terminal 102 that wirelessly communicates with the mobile base station 100 via the communication unit 601 .
  • the first calculation unit 603 executes a first calculation process for calculating the distance between the movable base station 100 and the user terminal 102. For example, the first calculation unit 603 uses the mobile base station 100 acquired by the acquisition unit 602 and the location information of the mobile base station 100 and the user terminal 102 that wirelessly communicates with the mobile base station 100 to determine Calculate the distance between the movable base station 100 and the user terminal 102.
  • the second calculation unit 604 executes a second calculation process of calculating the distance between the user terminal 102 and the reference point that serves as the reference for the movement range of the movable base station 100 .
  • the control device 10 pre-stores the base station information 608 including the position information of the reference point of each mobile base station 100 .
  • the second calculation unit 604 calculates the distance between the reference point of the mobile base station 100 and the user terminal 102 using the position information of this reference point and the position information of the user terminal 102 .
  • the movement instruction unit 605 moves to the movable base station so that the distance between the movable base station 100 and the user terminal 102 that performs wireless communication with the movable base station is equal to or less than the preset first distance D1.
  • a movement instruction process for instructing is executed.
  • the information management unit 606 stores and manages information such as the first distance D1, the second distance D2, and the base station information 608 in the storage unit 607 or the like.
  • the storage unit 607 stores various data, information, programs, etc., including information such as the first distance D1, the second distance D2, and the base station information 608, for example.
  • the functional configuration of the control device 10 shown in FIG. 6 is an example.
  • the function of the acquisition unit 602 may be included in the first calculation unit 603, or the first calculation unit 603 and the second calculation unit 604 may be one calculation unit.
  • the storage unit 607 may be implemented by a storage server or the like external to the control device 10 .
  • each functional configuration of the control device 10 shown in FIG. 6 may be distributed to a plurality of devices.
  • the movable base station 100 has a computer configuration, and the computer executes a predetermined program to operate, for example, a communication unit 621, a communication control unit 622, a position information transmission unit 623, a movement control unit 624, and the like. Realized. It should be noted that at least part of the functional configurations described above may be realized by hardware.
  • the communication unit 621 executes first communication processing for communicating with the control device 10 . Also, the communication unit 621 executes a second communication process for wirelessly communicating with the user terminal 102 .
  • the first communication method by which the communication unit 621 communicates with the control device 10 and the second communication method by which the communication unit 621 communicates with the user terminal 102 may be the same communication method, or may be different communication methods. There may be.
  • the communication control unit 622 controls the communication unit 621 to execute communication control processing (call control, etc.) for controlling wireless communication with the user terminal 102 .
  • the location information transmission unit 623 acquires location information indicating the location of the mobile base station 100 and performs location information transmission processing for transmitting the acquired location information to the control device 10 .
  • the movement control unit 624 executes movement control processing to control the mobile device provided in the mobile base station 100 so as to move the mobile base station 100 to the point instructed by the control device 10 .
  • the user terminal 102 may have any functional configuration as long as it has a function of acquiring position information indicating the position of the user terminal 102 and transmitting the acquired position information to the control device 10 .
  • the user terminal 102 for example, transmits the location information of the user terminal 102 to the control device 10 via the mobile base station 100 ⁇ Process flow> Subsequently, the flow of processing of the control method according to the present embodiment will be described by exemplifying a plurality of examples.
  • Example 1 is a flowchart illustrating an example of processing of the control device according to the first embodiment; FIG. This processing shows an example of processing executed by the control device 10 having the functional configuration described in FIG. 6, for example. It is assumed that the user terminal 102 is performing wireless communication with the mobile base station 1 (for example, the mobile base station 100-1 in FIG. 1) at the start of the process shown in FIG. It is also assumed that the user terminal 102 moves toward a mobile base station 2 (for example, the mobile base station 100-2 in FIG. 1). Furthermore, it is assumed that the control device 10 repeatedly executes the process of FIG. 7 at predetermined time intervals (for example, at intervals of one second).
  • predetermined time intervals for example, at intervals of one second.
  • step S701 the acquisition unit 602 of the control device 10 acquires the location information of the mobile base station 100 and the user terminal 102.
  • the acquisition unit 602 acquires location information transmitted by the user terminal 102 and the plurality of mobile base stations 100-1, 100-2, 100-3, .
  • step S702 the first calculator 603 of the control device 10 calculates the distance X between the movable base station 100 and the user terminal 102 using the position information acquired in step S701. Note that the distance X calculated by the first calculator 603 includes the distance X1 between the mobile base station 1 and the user terminal 102 and the distance X2 between the mobile base station 2 and the user terminal 102 .
  • step S703 the control device 10 determines whether or not the distance X1 calculated by the first calculation unit 603 is equal to or less than the preset first distance D1. If the distance X1 is less than or equal to the first distance D1, the control device 10 terminates the process. On the other hand, when the distance X1 exceeds the first distance D1, the control device 10 causes the process to proceed to step S704.
  • the second calculation unit 604 of the control device 10 calculates the distance Y1 between the reference point 1 of the mobile base station 1 and the user terminal 102.
  • FIG. 8 is a diagram for explaining the first distance and the second distance according to the first embodiment. If the distance between mobile base station 1 and user terminal 102 is less than first distance D1, control device 10 determines that the communication quality is sufficiently good and does not instruct mobile base station 1 to move. On the other hand, when the distance between the mobile base station 1 and the user terminal 102 exceeds the first distance D1, the control device 10 reduces the distance between the mobile base station 1 and the user terminal 102 to the first distance D1. The movable base station 1 is instructed to move so that the distance is less than or equal to D1.
  • a second distance D2 by which the mobile base station 1 can move from the reference point 1, which is the center of the mobile base station 1's movement range, is set in advance.
  • the control device 10 determines that the distance X1 between the mobile base station 1 and the user terminal 102 is less than or equal to the first distance D1.
  • the mobile base station 1 is instructed to move so that
  • the control device 10 determines that the distance X2 between the other movable base station 2 and the user terminal 102 is the first distance D2.
  • the movable base station 2 is instructed to move so that the distance is less than or equal to D1.
  • step S705 of FIG. 7 the control device 10 determines whether or not the distance Y1 calculated by the second calculator 604 is equal to or less than the second distance D2. If the distance Y1 is less than or equal to the second distance D2, the control device 10 causes the process to proceed to step S706. On the other hand, when the distance Y1 exceeds the second distance D2, the control device 10 shifts the process to step S708.
  • step S706 the movement instruction unit 605 of the control device 10 selects the distance from the user terminal 102 among the movement candidate points of the movable base station 1 whose distance from the user terminal 102 is equal to or less than the first distance D1. , or the movable candidate point with the shortest distance from the mobile base station 1 is selected.
  • FIG. 9 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment.
  • the movable base station 100-1 according to the first embodiment has, for example, a plurality of movement candidate points 901 as shown in FIG. Further, as shown in FIG. 9, when the user terminal 102 moves beyond the first distance D1, the movement instruction unit 605 of the control device 10 determines that the distance from the user terminal 102 is the first distance D1.
  • One moving candidate point is selected from the following moving candidate points 901a and 901b.
  • the movement instruction unit 605 selects the movement candidate point with the shortest distance from the user terminal 102 from the movement candidate points 901a and 901b.
  • the movement instruction unit 605 selects a movement point with a shorter movement distance from the movable base station 100-1. Select the candidate point 901a.
  • the movement instruction unit 605 may select from the beginning the movement candidate point 901a, which has the shortest movement distance from the mobile base station 1001-1, from the movement candidate points 901a and 901b.
  • step S707 of FIG. 7 the movement instruction unit 605 instructs the mobile base station 1 to move to the movement candidate point selected in step S706.
  • the movement instructing unit 605 selects the movement candidate points from the user terminal 102 among the movement candidate points of the movable base station 2 whose distance from the user terminal 102 is the first distance D1 or less.
  • the movement candidate point with the shortest distance or the movement candidate point with the shortest movement distance from the movable base station 2 is selected.
  • FIG. 10 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment.
  • Another movable base station 100-2 according to the first embodiment also has a plurality of movement candidate points 901 as shown in FIG. Also, when the user terminal 102 moves beyond the second distance D2, the movement instruction unit 605 selects one movement candidate point from the plurality of movement candidate points 901c and 901d of the mobile base station 100-2. .
  • the movement instruction unit 605 selects the movement candidate point with the shortest distance from the user terminal 102 from the movement candidate points 901c and 901d.
  • the movement instruction unit 605 selects a movement point with a shorter movement distance from the movable base station 100-2. Select the candidate point 901c.
  • the movement instruction unit 605 may initially select the movement candidate point 901c, which has the shortest movement distance from the mobile base station 1001-1, from the movement candidate points 901c and 901d.
  • the movement instruction unit 605 instructs the mobile base station 2 to move to the movement candidate point selected at step S708.
  • the control device 10 controls the plurality of mobile base stations 100 so that the distance between the mobile base station 100 and the user terminal 102 is equal to or less than the first distance D1. can be done.
  • mobile base station 100 may be freely movable along a predetermined path such as a corridor or track.
  • FIG. 11 is a flowchart illustrating an example of processing of the control device according to the second embodiment. This process represents another example of the process executed by the control device 10 having the functional configuration described with reference to FIG. 6, for example. 11, the processing of steps S701 to S704 is the same as the processing of the control device according to the first embodiment described with reference to FIG. 7, so description thereof will be omitted here.
  • step S1101 the control device 10 determines whether or not the distance Y1 calculated by the second calculation unit 604 is less than or equal to the second distance D2. If the distance Y1 is less than or equal to the second distance D2, the control device 10 causes the process to proceed to step S1102. On the other hand, when the distance Y1 exceeds the second distance D2, the control device 10 shifts the process to step S1104.
  • the movement instruction unit 605 of the control device 10 determines the movement point of the mobile base station 1 where the distance from the user terminal 102 is equal to or less than the first distance D1. For example, when the movable base station 1 can move freely on a predetermined route, the movement instruction unit 605 determines that the distance to the user terminal 102 is the shortest (or within a predetermined distance) on the predetermined route. may be determined as the moving point of the mobile base station 1 . Alternatively, the movement instruction unit 605 makes the movement distance of the movable base station 1 the shortest among the points where the distance to the user terminal 102 is equal to or less than a preset third distance D3 (D3 ⁇ D1). The point may be determined as the moving point of the mobile base station 1 . Furthermore, the movement instruction unit 605 may select the movement point of the mobile base station 1 by the same method as in the first embodiment.
  • step S1103 the movement instruction unit 605 instructs the movable base station 1 to move to the movement candidate point determined in step S1102.
  • the movement instructing unit 605 determines that the distance X between the user terminal 102 among the other mobile base stations 100 different from the mobile base station 1 is the first distance D1 or less.
  • a search is made for other mobile base stations 100 that can move to the position where
  • the control device 10 stores in advance the range in which each mobile base station 100 can move in the base station information 608 or the like.
  • movement instruction section 605 uses the movable range of each mobile base station 100 and the position information of user terminal 102 to determine the position where distance X from user terminal 102 is equal to or less than first distance D1. search for other mobile base stations 100 that can move to
  • step S1105 the movement instruction unit 605 determines whether or not there is a mobile base station 100 that satisfies the conditions in step S1104. If there is a mobile base station 100 that satisfies the above conditions, the movement instruction unit 605 shifts the process to step S1106. On the other hand, if there is no mobile base station 100 that satisfies the above conditions, the movement instruction unit 605 terminates the process.
  • step S1106 the movement instruction unit 605 selects one mobile base station Z that satisfies the above conditions, and moves the mobile base station Z to a point where the distance from the user terminal 102 is equal to or less than the first distance. to decide. Note that the method of determining the moving point of the mobile base station Z may be the same as in step S1102.
  • FIG. 12 is a diagram showing an image of processing of the wireless communication system according to the second embodiment.
  • the user terminal 102 is not in the coverage area 101-2 of the mobile base station 100-2, but in the coverage area 101-2 of the mobile base station 100-Z, for example. Even when moving to Z, mobile base station 100-Z can be controlled so that the distance to user terminal 102 is less than or equal to first distance D1.
  • the movement instruction unit 605 selects one mobile base station 100 with a shorter distance to the user terminal 102, for example.
  • one mobile base station 100 may be selected at random.
  • step S1107 of FIG. 11 the movement instruction unit 605 instructs the movable base station Z to move to the movement candidate point determined in step S1106.
  • the control device 10 controls the plurality of mobile base stations 100 so that the distance between the mobile base station 100 and the user terminal 102 is equal to or less than the first distance D1. can be done.
  • FIG. 13 is a diagram showing an example of the hardware configuration of the control device, movable base station, and user terminal according to this embodiment.
  • the control device 10, mobile base station 100, and user terminal 102 have, for example, the configuration of a computer 1300 as shown in FIG.
  • Mobile base station 100 has a configuration in which a wireless base station having the configuration of computer 1300 is mounted on a mobile device that moves according to control from computer 1300 .
  • the computer 1300 has a processor 1301, a memory 1302, a storage device 1303, a communication device 1304, an input device 1305, an output device 1306, a bus B, and the like.
  • the processor 1301 is, for example, an arithmetic device such as a CPU (Central Processing Unit) that implements various functions by executing a predetermined program.
  • the memory 1302 is a storage medium readable by the computer 1300, and includes, for example, RAM (Random Access Memory), ROM (Read Only Memory), and the like.
  • the storage device 1303 is a computer-readable storage medium, and may include, for example, HDDs (Hard Disk Drives), SSDs (Solid State Drives), various optical discs, and magneto-optical discs.
  • the communication device 1304 includes one or more pieces of hardware (communication devices) for communicating with other devices via a wireless or wired network.
  • the input device 1305 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
  • the output device 1306 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1305 and the output device 1306 may be integrated (for example, an input/output device such as a touch panel display).
  • a bus B is commonly connected to each of the components described above, and transmits, for example, address signals, data signals, and various control signals.
  • the processor 1301 is not limited to a CPU, and may be, for example, a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).
  • the control device 10 and the mobile base station 100 in this embodiment are not limited to being realized by a dedicated device, and may be realized by a general-purpose computer.
  • a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read into a computer system and executed.
  • the "computer system” referred to here includes hardware such as an OS and peripheral devices.
  • “computer-readable recording medium” includes various storage devices such as portable media such as flexible disks, magneto-optical disks, ROMs and CD-ROMs, and hard disks built into computer systems.
  • “computer-readable recording medium” refers to a program that dynamically retains programs for a short period of time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include something that holds the program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in that case.
  • the above program may be for realizing part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in a computer system, It may be implemented using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • the control device 10 moves following the mobile base station 100-1 in accordance with the user terminal 102 moving in the coverage area 101-1 of the mobile base station 100-1.
  • the control device 10 for example, as described with reference to FIGS. 100-2 can be followed and moved. Thereby, even if the user terminal 102 moves, it is possible to maintain the required communication quality and prevent the communication from being interrupted.
  • a control device that controls the mobile base station, Acquisition processing for acquiring location information of the movable base station and the user terminal that wirelessly communicates with the movable base station; a first calculation process for calculating the distance between the movable base station and the user terminal; movement instruction processing for instructing the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance; control method.
  • the mobile base station has a plurality of moveable candidate moving points, In the movement instruction process, among the movement candidate points whose distance from the user terminal is equal to or less than the first distance, movement from the movable base station or the movement candidate point with the shortest distance from the user terminal is performed. 2. The control method according to claim 1, wherein the movable base station is instructed to move to a movement candidate point having the shortest distance. (Section 3) Item 1 or 2, wherein the move instruction process instructs the moveable base station to move when the user terminal is within a range in which the moveable base station can move following the user terminal. The control method described in .
  • the acquisition process acquires position information of other mobile base stations adjacent or close to the mobile base station,
  • the other movable base station instructs the other movable base station and the user terminal to move. 4.
  • the control method according to any one of items 1 to 3, wherein the movement is instructed so that the distance to the terminal is equal to or less than the first distance.
  • the other movable base station capable of moving to a position where the distance from the user terminal is equal to or less than the first distance is instructed to move.
  • a control device for controlling a mobile base station an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station; a first calculator configured to calculate a distance between the mobile base station and the user terminal; a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
  • a control device having a A communication system including a mobile base station having a radio base station mounted on a mobile device and a control device for controlling the mobile base station, The control device is an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station; a first calculator configured to calculate a distance between the mobile base station and the user terminal; a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance; has The wireless communication system, wherein the movable device and the user terminal that wirelessly communicate
  • control device 100, 100-1, 100-2, 100-3 movable base station 102 user terminal 602 acquisition unit 603 first calculation unit 604 second calculation unit 605 movement instruction unit 623 location information transmission unit 624 movement control unit

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Abstract

According to this control method, in order to facilitate maintenance of a radio link when a user terminal has moved in a radio communication system including a movable base station, a control device that controls the movable base station, which is a radio base station mounted on a movable device, executes: an acquisition process of acquiring position information of the movable base station and a user terminal that performs radio communication with the movable base station; a first calculation process of calculating the distance between the movable base station and the user terminal; and a movement instructing process of instructing the movable base station to move such that the distance between the movable base station and the user terminal is equal to or less than a pre-set first distance.

Description

制御方法、制御装置、及び無線通信システムCONTROL METHOD, CONTROL DEVICE, AND WIRELESS COMMUNICATION SYSTEM
　本発明は、制御方法、制御装置、及び無線通信システムに関する。 The present invention relates to control methods, control devices, and wireless communication systems.
　無線基地局を可動装置に搭載した複数の可動基地局を用いて、通信要求、又は伝播環境等に応じて、動的に無線通信エリアを形成する無線ネットワーク制御技術が提案されている（例えば、非特許文献１参照）。 Wireless network control technology has been proposed that dynamically forms wireless communication areas according to communication requests, propagation environments, etc., using a plurality of mobile base stations each having a wireless base station installed in a mobile device (for example, See Non-Patent Document 1).
　従来、移動通信においては、基地局は固定設置が一般的である。しかし、工場内等のような、遮蔽環境が厳しく、ユーザ端末、及び遮蔽物等が移動するような環境において、ローカル５Ｇ（5th Generation）のような高周波数帯を利用するシステムを導入した場合、無線リンクの確立、又は維持が困難になる場合がある。 Conventionally, in mobile communications, base stations are generally fixed installations. However, in environments such as factories where the shielding environment is severe and user terminals and shielding objects are moving, if a system that uses a high frequency band such as local 5G (5th Generation) is introduced, Establishing or maintaining a radio link can be difficult.
　非特許文献１に開示された技術により、無線環境の変化に応じて、可動基地局の配置を最適化することができるが、例えば、ユーザ端末が移動したときに、無線リンクの維持が困難になるという課題を解決することはできない。 With the technology disclosed in Non-Patent Document 1, it is possible to optimize the arrangement of mobile base stations according to changes in the radio environment. cannot solve the problem of becoming
　本発明の実施形態は、上記の問題点に鑑みてなされたものであって、可動基地局を含む無線通信システムにおいて、ユーザ端末が移動したときに、無線リンクの維持を容易にする。 Embodiments of the present invention have been made in view of the above problems, and facilitate maintenance of a radio link when a user terminal moves in a radio communication system including mobile base stations.
　上記の課題を解決するため、本発明の実施形態に係る制御方法は、無線基地局を可動装置に搭載した可動基地局を制御する制御装置が、前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得する取得処理と、前記可動基地局と前記ユーザ端末との間の距離を算出する第１の算出処理と、前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示する移動指示処理と、を実行する。 In order to solve the above problems, a control method according to an embodiment of the present invention provides a control device for controlling a mobile base station having a radio base station mounted on a mobile device, wherein the mobile base station and the mobile base station are wirelessly connected to the mobile base station. a first calculation process for calculating a distance between the mobile base station and the user terminal; and a distance between the mobile base station and the user terminal. and a movement instruction process for instructing the movable base station to move so that the distance is equal to or less than a preset first distance.
　本発明の実施形態によれば、可動基地局を含む無線通信システムにおいて、ユーザ端末が移動したときに、無線リンクの維持が容易になる。 According to the embodiments of the present invention, in a wireless communication system including mobile base stations, it becomes easier to maintain a wireless link when a user terminal moves.
本実施形態に係る無線通信システムのシステム構成の例を示す図である。It is a figure which shows the example of the system configuration|structure of the radio|wireless communications system which concerns on this embodiment. 本実施形態に係る処理の概要について説明するための図（１）である。FIG. 11 is a diagram (1) for explaining an outline of processing according to the present embodiment; 本実施形態に係る処理の概要について説明するための図（２）である。FIG. 2 is a diagram (2) for explaining an overview of processing according to the present embodiment; 本実施形態に係る処理の概要について説明するための図（３）である。FIG. 3 is a diagram (3) for explaining an outline of processing according to the present embodiment; 本実施形態に係る処理の概要について説明するための図（４）である。FIG. 4 is a diagram (4) for explaining an outline of processing according to the present embodiment; 本実施形態に係る無線通信システムの機能構成の例を示す図である。It is a figure which shows the example of functional structure of the radio|wireless communications system which concerns on this embodiment. 実施例１に係る制御装置の処理の例を示すフローチャートである。5 is a flow chart showing an example of processing of the control device according to the first embodiment; 実施例１に係る第１の距離、及び第２の距離について説明するための図である。FIG. 4 is a diagram for explaining a first distance and a second distance according to Example 1; 実施例１に係る移動候補地点の選択方法の例について説明するための図（１）である。FIG. 11 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment; 実施例１に係る移動候補地点の選択方法の例について説明するための図（２）である。FIG. 2B is a diagram (2) for explaining an example of a method of selecting a movement candidate point according to the first embodiment; 実施例２に係る制御装置の処理の例を示すフローチャートである。10 is a flow chart showing an example of processing of the control device according to the second embodiment; 実施例２に係る無線通信システムの処理のイメージを示す図である。FIG. 10 is a diagram showing an image of processing of the wireless communication system according to the second embodiment; 本実施形態に係る制御装置、可動基地局、及びユーザ端末のハードウェア構成の例を示す図である。It is a figure which shows the example of the hardware constitutions of the control apparatus which concerns on this embodiment, a mobile base station, and a user terminal.
　以下、図面を参照して本発明の実施の形態（本実施形態）を説明する。以下で説明する実施形態は一例に過ぎず、本発明が適用される実施形態は、以下の実施形態に限られない。 An embodiment (this embodiment) of the present invention will be described below with reference to the drawings. The embodiments described below are merely examples, and embodiments to which the present invention is applied are not limited to the following embodiments.
　＜システム構成＞
　図１は、本実施形態に係る無線通信システムのシステム構成の例を示す図である。無線通信システム１は、無線基地局を可動装置に搭載した複数の可動基地局１００－１、１００－２、１００－３、・・・と、複数の可動基地局１００－１、１００－２、１００－３、・・・を制御する制御装置１０とを含む。なお、以下の説明において、複数の可動基地局１００－１、１００－２、１００－３、・・・のうち、任意の可動基地局を示す場合、「可動基地局１００」を用いる。 <System configuration>
FIG. 1 is a diagram showing an example of the system configuration of a radio communication system according to this embodiment. A radio communication system 1 includes a plurality of mobile base stations 100-1, 100-2, 100-3, . 100-3, . . . In the following description, "mobile base station 100" is used when referring to an arbitrary mobile base station among the plurality of mobile base stations 100-1, 100-2, 100-3, . . .
　可動基地局１００は、無線通信システム１を利用するユーザが利用するユーザ端末１０２と、例えば、５Ｇ（5th. Generation）、ＬＴＥ(Long Term Evolution)等の所定の無線通信を行う無線基地局である。可動基地局１００は、制御装置１０と通信可能に接続され、制御装置１０からの指示に応じて、基準点を中心とする所定の範囲内を移動できるように構成されている。 Mobile base station 100 is a radio base station that performs predetermined radio communication such as 5G (5th. Generation) and LTE (Long Term Evolution) with user terminal 102 used by a user who uses radio communication system 1. . Movable base station 100 is communicably connected to control device 10 and is configured to be able to move within a predetermined range around a reference point in accordance with instructions from control device 10 .
　例えば、可動基地局１００－１は、基準点を中心とする所定の範囲内を移動することにより、可動基地局１００－１のカバーエリア１０１－１の範囲内で、ユーザ端末１０２と無線通信を行うことができる。同様に、可動基地局１００－２は、カバーエリア１０１－２の範囲内でユーザ端末１０２と無線通信を行い、可動基地局１００－３は、カバーエリア１０１－２の範囲内でユーザ端末１０２と無線通信を行うことができる。 For example, mobile base station 100-1 moves within a predetermined range centered on a reference point, thereby establishing wireless communication with user terminal 102 within coverage area 101-1 of mobile base station 100-1. It can be carried out. Similarly, the mobile base station 100-2 performs wireless communication with the user terminal 102 within the coverage area 101-2, and the mobile base station 100-3 communicates with the user terminal 102 within the coverage area 101-2. Wireless communication is possible.
　制御装置１０は、複数の可動基地局１００を制御する装置、又は複数の装置を含むシステムである。制御装置１０は、可動基地局１００、およびユーザ端末１０２から位置情報を取得し、可動基地局１００とユーザ端末１０２との間の距離が所定の距離以内となるように可動基地局を移動させる。 The control device 10 is a device that controls multiple mobile base stations 100 or a system that includes multiple devices. The control device 10 acquires position information from the mobile base station 100 and the user terminal 102, and moves the mobile base station so that the distance between the mobile base station 100 and the user terminal 102 is within a predetermined distance.
　ユーザ端末１０２は、ユーザが利用する無線局であり、複数の可動基地局１００－１、１００－２、１００－３、・・・のうち、最も通信品質が良い可動基地局１００に所定の無線通信で接続する。 A user terminal 102 is a radio station used by a user, and is a mobile base station 100 with the best communication quality among a plurality of mobile base stations 100-1, 100-2, 100-3, . . . Connect by communication.
　（処理の概要）
　図２～５は、本実施形態に係る処理の概要について説明するための図である。可動基地局１００は、予め測定した測定データ、又は設計値等により、所定の通信品質が得られる距離（以下、第１の距離Ｄ１と呼ぶ）が予め設定されている。この第１の距離Ｄ１は、例えば、次の式（１）等に基づいて決定することができる。 (Summary of processing)
2 to 5 are diagrams for explaining the outline of the processing according to this embodiment. The movable base station 100 is preset with a distance (hereinafter referred to as a first distance D1) at which a predetermined communication quality is obtained, based on measurement data measured in advance, design values, or the like. This first distance D1 can be determined, for example, based on the following formula (1).
Figure JPOXMLDOC01-appb-M000001
 　式（１）において、Ｌは伝搬損失、λは波長（ｍ）、Ｘは距離（ｍ）である。この式（１）を用いて、例えば、無線通信システム１が利用する周波数帯において、伝搬損失Ｌが所定の値以下となるように、第１の距離Ｄ１を求めることができる。ただし、これに限られず、第１の距離Ｄ１は、式（１）以外の方法で求めてもよい。
Figure JPOXMLDOC01-appb-M000001
 In equation (1), L is propagation loss, λ is wavelength (m), and X is distance (m). Using this formula (1), for example, the first distance D1 can be obtained so that the propagation loss L is equal to or less than a predetermined value in the frequency band used by the radio communication system 1. FIG. However, the first distance D1 is not limited to this, and may be obtained by a method other than the formula (1).
　図１に示すように、可動基地局１００－１に無線通信で接続しているユーザ端末１０２が、図２に示すように、可動基地局１００－１から第１の距離Ｄ１の範囲２０１－１の外に移動するものとする（図２のステップＳ１）。この場合、制御装置１０は、可動基地局１００－１とユーザ端末１０２との間の距離が第１の距離Ｄ１以下となるように、可動基地局１００－１に移動を指示する（図２のステップＳ２）。これにより、可動基地局１００－１は、例えば、図３に示すように、可動基地局１００－１とユーザ端末１０２との間の距離が第１の距離以内となる地点に追従して移動する（図３のステップＳ３）。 As shown in FIG. 1, the user terminal 102 connected to the mobile base station 100-1 by wireless communication, as shown in FIG. (step S1 in FIG. 2). In this case, control device 10 instructs mobile base station 100-1 to move so that the distance between mobile base station 100-1 and user terminal 102 is equal to or less than first distance D1 (see FIG. 2). step S2). As a result, mobile base station 100-1, for example, as shown in FIG. 3, follows and moves to a point where the distance between mobile base station 100-1 and user terminal 102 is within the first distance. (Step S3 in FIG. 3).
　このように、制御装置１０は、可動基地局１００－１とユーザ端末１０２との間の距離が第１の距離Ｄ１以内となるように可動基地局１００－１を移動させることにより、ユーザ端末１０２は、カバーエリア１０１－１の範囲内で良好な通信品質を得ることができる。 In this way, the control device 10 moves the mobile base station 100-1 so that the distance between the mobile base station 100-1 and the user terminal 102 is within the first distance D1. can obtain good communication quality within the coverage area 101-1.
　また、ユーザ端末１０２が、図４に示すように、可動基地局１００－１のカバーエリア１０１－１から、可動基地局１００－２のカバーエリア１０１－２に移動するものとする（図４のステップＳ４）。この場合、制御装置１０は、他の可動基地局１００－２とユーザ端末１０２との間の距離が第１の距離以内となるように、可動基地局１００－２に移動を指示する（図４のステップＳ５）。これにより、可動基地局１００－２は、図５に示すように、可動基地局１００－２とユーザ端末１０２との間の距離が第１の距離以内となる地点に追従して移動する（図５のステップＳ６）。制御装置１０は、ユーザ端末１０２が、可動基地局１００－３のカバーエリア１０１－３内に移動した場合は、可動基地局１００－３に対して同様の処理を行う。 It is also assumed that user terminal 102 moves from coverage area 101-1 of mobile base station 100-1 to coverage area 101-2 of mobile base station 100-2, as shown in FIG. step S4). In this case, control device 10 instructs mobile base station 100-2 to move so that the distance between other mobile base station 100-2 and user terminal 102 is within the first distance (FIG. 4). step S5). As a result, as shown in FIG. 5, mobile base station 100-2 follows and moves to a point where the distance between mobile base station 100-2 and user terminal 102 is within the first distance (see FIG. 5). 5 step S6). When the user terminal 102 moves into the coverage area 101-3 of the mobile base station 100-3, the control device 10 performs the same processing for the mobile base station 100-3.
　このように、制御装置１０は、ユーザ端末１０２との間の距離が第１の距離以内となる地点に移動可能な可動基地局１００に、当該可動基地局１００とユーザ端末１０２との間の距離が第１の距離以内となるように移動させる。これにより、本実施形態によれば、可動基地局１００を含む無線通信システム１において、ユーザ端末１０２が移動したときに、無線リンクの維持が容易になる。 In this way, the control device 10 instructs the mobile base station 100, which is movable to a point within the first distance from the user terminal 102, to determine the distance between the mobile base station 100 and the user terminal 102. is within the first distance. Thereby, according to this embodiment, in the radio communication system 1 including the mobile base station 100, it becomes easy to maintain the radio link when the user terminal 102 moves.
　＜機能構成＞
　続いて、本実施形態に係る無線通信システム１の機能構成について説明する。図６は、本実施形態に係る無線通信システムの機能構成の例を示す図である。なお、図６において、可動基地局１００－２、１００－３は、可動基地局１００－１と同様の機能構成を有しているものとする。 <Functional configuration>
Next, the functional configuration of the radio communication system 1 according to this embodiment will be described. FIG. 6 is a diagram showing an example of the functional configuration of the radio communication system according to this embodiment. In FIG. 6, mobile base stations 100-2 and 100-3 are assumed to have the same functional configuration as mobile base station 100-1.
　（制御装置の機能構成）
　制御装置１０は、コンピュータの構成を備えており、当該コンピュータが所定のプログラムを実行することにより、例えば、通信部６０１、取得部６０２、第１の算出部６０３、第２の算出部６０４、移動指示部６０５、情報管理部６０６、及び記憶部６０７等を実現している。なお、上記の各機能構成のうち、少なくとも一部は、ハードウェアによって実現されるものであってもよい。 (Functional configuration of control device)
The control device 10 has a configuration of a computer, and when the computer executes a predetermined program, for example, a communication unit 601, an acquisition unit 602, a first calculation unit 603, a second calculation unit 604, a movement It implements an instruction unit 605, an information management unit 606, a storage unit 607, and the like. It should be noted that at least part of the functional configurations described above may be realized by hardware.
　通信部６０１は、可動基地局１００と通信する通信処理を実行する。また、通信部６０１は、例えば、ユーザ端末１０２と直接、又は可動基地局１００を介して通信可能である。 The communication unit 601 executes communication processing for communicating with the mobile base station 100. Also, the communication unit 601 can communicate with the user terminal 102 directly or via the mobile base station 100, for example.
　取得部６０２は、通信部６０１を介して、可動基地局１００、及び可動基地局１００と無線通信を行うユーザ端末１０２の位置情報を取得する取得処理を実行する。 The acquisition unit 602 executes acquisition processing for acquiring location information of the mobile base station 100 and the user terminal 102 that wirelessly communicates with the mobile base station 100 via the communication unit 601 .
　第１の算出部６０３は、可動基地局１００とユーザ端末１０２との間の距離を算出する第１の算出処理を実行する。例えば、第１の算出部６０３は、取得部６０２が取得した可動基地局１００、及び可動基地局１００と無線通信を行うユーザ端末１０２との位置情報を用いて、可動基地局１００とユーザ端末１０２との間の距離を算出する。 The first calculation unit 603 executes a first calculation process for calculating the distance between the movable base station 100 and the user terminal 102. For example, the first calculation unit 603 uses the mobile base station 100 acquired by the acquisition unit 602 and the location information of the mobile base station 100 and the user terminal 102 that wirelessly communicates with the mobile base station 100 to determine Calculate the distance between
　第２の算出部６０４は、可動基地局１００の移動範囲の基準となる基準点と、ユーザ端末１０２との間の距離を算出する第２の算出処理を実行する。例えば、制御装置１０は、各可動基地局１００の基準点の位置情報を含む基地局情報６０８を予め記憶しておく。第２の算出部６０４は、この基準点の位置情報と、ユーザ端末１０２の位置情報とを用いて、可動基地局１００の基準点とユーザ端末１０２との間の距離を算出する。 The second calculation unit 604 executes a second calculation process of calculating the distance between the user terminal 102 and the reference point that serves as the reference for the movement range of the movable base station 100 . For example, the control device 10 pre-stores the base station information 608 including the position information of the reference point of each mobile base station 100 . The second calculation unit 604 calculates the distance between the reference point of the mobile base station 100 and the user terminal 102 using the position information of this reference point and the position information of the user terminal 102 .
　移動指示部６０５は、可動基地局１００と、当該可動基地局と無線通信を行うユーザ端末１０２との間の距離が、予め設定した第１の距離Ｄ１以下となるように、可動基地局に移動を指示する移動指示処理を実行する。 The movement instruction unit 605 moves to the movable base station so that the distance between the movable base station 100 and the user terminal 102 that performs wireless communication with the movable base station is equal to or less than the preset first distance D1. A movement instruction process for instructing is executed.
　情報管理部６０６は、第１の距離Ｄ１、第２の距離Ｄ２、及び基地局情報６０８等の情報を、記憶部６０７等に記憶して管理する。記憶部６０７は、例えば、第１の距離Ｄ１、第２の距離Ｄ２、及び基地局情報６０８等の情報を含む、様々なデータ、情報、及びプログラム等を記憶する。 The information management unit 606 stores and manages information such as the first distance D1, the second distance D2, and the base station information 608 in the storage unit 607 or the like. The storage unit 607 stores various data, information, programs, etc., including information such as the first distance D1, the second distance D2, and the base station information 608, for example.
　なお、図６に示した制御装置１０の機能構成は一例である。例えば、取得部６０２の機能は、第１の算出部６０３に含まれていてもよいし、第１の算出部６０３と第２の算出部６０４は、１つの算出部であってもよい。また、記憶部６０７は、制御装置１０の外部のストレージサーバ等によって実現されるものであってもよい。さらに、図６に示した制御装置１０の各機能構成は、複数の装置に分散して設けられていてもよい。 Note that the functional configuration of the control device 10 shown in FIG. 6 is an example. For example, the function of the acquisition unit 602 may be included in the first calculation unit 603, or the first calculation unit 603 and the second calculation unit 604 may be one calculation unit. Also, the storage unit 607 may be implemented by a storage server or the like external to the control device 10 . Furthermore, each functional configuration of the control device 10 shown in FIG. 6 may be distributed to a plurality of devices.
　（可動基地局の機能構成）
　可動基地局１００は、コンピュータの構成を備えており、当該コンピュータが所定のプログラムを実行することにより、例えば、通信部６２１、通信制御部６２２、位置情報送信部６２３、及び移動制御部６２４等を実現している。なお、上記の各機能構成のうち、少なくとも一部は、ハードウェアによって実現されるものであってもよい。 (Functional configuration of mobile base station)
The movable base station 100 has a computer configuration, and the computer executes a predetermined program to operate, for example, a communication unit 621, a communication control unit 622, a position information transmission unit 623, a movement control unit 624, and the like. Realized. It should be noted that at least part of the functional configurations described above may be realized by hardware.
　通信部６２１は、制御装置１０と通信する第１の通信処理を実行する。また、通信部６２１は、ユーザ端末１０２と無線通信を行う第２の通信処理を実行する。なお、通信部６２１が制御装置１０と通信する第１の通信方式と、通信部６２１がユーザ端末１０２と通信する第２の通信方式は、同じ通信方式であってもよいし、異なる通信方式であってもよい。 The communication unit 621 executes first communication processing for communicating with the control device 10 . Also, the communication unit 621 executes a second communication process for wirelessly communicating with the user terminal 102 . The first communication method by which the communication unit 621 communicates with the control device 10 and the second communication method by which the communication unit 621 communicates with the user terminal 102 may be the same communication method, or may be different communication methods. There may be.
　通信制御部６２２は、通信部６２１を制御して、ユーザ端末１０２との無線通信を制御する通信制御処理（呼制御等）を実行する。位置情報送信部６２３は、可動基地局１００の位置を示す位置情報を取得し、取得した位置情報を制御装置１０に送信する位置情報送信処理を実行する。移動制御部６２４は、制御装置１０から指示された地点に、可動基地局１００を移動するように、可動基地局１００が備える可動装置を制御する移動制御処理を実行する。 The communication control unit 622 controls the communication unit 621 to execute communication control processing (call control, etc.) for controlling wireless communication with the user terminal 102 . The location information transmission unit 623 acquires location information indicating the location of the mobile base station 100 and performs location information transmission processing for transmitting the acquired location information to the control device 10 . The movement control unit 624 executes movement control processing to control the mobile device provided in the mobile base station 100 so as to move the mobile base station 100 to the point instructed by the control device 10 .
　（ユーザ端末の機能構成）
　ユーザ端末１０２は、ユーザ端末１０２の位置を示す位置情報を取得し、取得した位置情報を制御装置１０に送信する機能を有していれば、任意の機能構成であってよい。ユーザ端末１０２は、例えば、可動基地局１００を介して、ユーザ端末１０２の位置情報を制御装置１０に送信する
　＜処理の流れ＞
　続いて、本実施形態に係る制御方法の処理の流れについて、複数の実施例を例示して説明する。 (Functional configuration of user terminal)
The user terminal 102 may have any functional configuration as long as it has a function of acquiring position information indicating the position of the user terminal 102 and transmitting the acquired position information to the control device 10 . The user terminal 102, for example, transmits the location information of the user terminal 102 to the control device 10 via the mobile base station 100 <Process flow>
Subsequently, the flow of processing of the control method according to the present embodiment will be described by exemplifying a plurality of examples.
　［実施例１］
　図７は、実施例１に係る制御装置の処理の例を示すフローチャートである。この処理は、例えば、図６で説明した機能構成を有する制御装置１０が実行する処理の一例を示している。なお、図７に示す処理の開始時点において、ユーザ端末１０２は、移動元の可動基地局１（例えば、図１の可動基地局１００－１）と無線通信を行っているものとする。また、ユーザ端末１０２は、移動先の可動基地局２（例えば、図１の可動基地局１００－２）に向かって移動するものとする。さらに、制御装置１０は、図７の処理を、所定の時間ごと（例えば１秒ごと）に、繰り返し実行するものとする。 [Example 1]
7 is a flowchart illustrating an example of processing of the control device according to the first embodiment; FIG. This processing shows an example of processing executed by the control device 10 having the functional configuration described in FIG. 6, for example. It is assumed that the user terminal 102 is performing wireless communication with the mobile base station 1 (for example, the mobile base station 100-1 in FIG. 1) at the start of the process shown in FIG. It is also assumed that the user terminal 102 moves toward a mobile base station 2 (for example, the mobile base station 100-2 in FIG. 1). Furthermore, it is assumed that the control device 10 repeatedly executes the process of FIG. 7 at predetermined time intervals (for example, at intervals of one second).
　ステップＳ７０１において、制御装置１０の取得部６０２は、可動基地局１００、及びユーザ端末１０２の位置情報を取得する。例えば、取得部６０２は、図６のユーザ端末１０２、及び複数の可動基地局１００－１、１００－２、１００－３、・・・が送信する位置情報を取得する。 In step S701, the acquisition unit 602 of the control device 10 acquires the location information of the mobile base station 100 and the user terminal 102. For example, the acquisition unit 602 acquires location information transmitted by the user terminal 102 and the plurality of mobile base stations 100-1, 100-2, 100-3, .
　ステップＳ７０２において、制御装置１０の第１の算出部６０３は、ステップＳ７０１で取得した位置情報を用いて、可動基地局１００とユーザ端末１０２との間の距離Ｘを算出する。なお、第１の算出部６０３が算出する距離Ｘには、可動基地局１とユーザ端末１０２との間の距離Ｘ１、及び可動基地局２とユーザ端末１０２との間の距離Ｘ２が含まれる。 In step S702, the first calculator 603 of the control device 10 calculates the distance X between the movable base station 100 and the user terminal 102 using the position information acquired in step S701. Note that the distance X calculated by the first calculator 603 includes the distance X1 between the mobile base station 1 and the user terminal 102 and the distance X2 between the mobile base station 2 and the user terminal 102 .
　ステップＳ７０３において、制御装置１０は、第１の算出部６０３が算出した距離Ｘ１が、予め設定した第１の距離Ｄ１以下であるか否かを判断する。距離Ｘ１が第１の距離Ｄ１以下である場合、制御装置１０は、処理を終了する。一方、距離Ｘ１が第１の距離Ｄ１を超える場合、制御装置１０は、処理をステップＳ７０４に移行させる。 In step S703, the control device 10 determines whether or not the distance X1 calculated by the first calculation unit 603 is equal to or less than the preset first distance D1. If the distance X1 is less than or equal to the first distance D1, the control device 10 terminates the process. On the other hand, when the distance X1 exceeds the first distance D1, the control device 10 causes the process to proceed to step S704.
　ステップＳ７０４に移行すると、制御装置１０の第２の算出部６０４は、可動基地局１の基準点１と、ユーザ端末１０２との間の距離Ｙ１を算出する。 After moving to step S704, the second calculation unit 604 of the control device 10 calculates the distance Y1 between the reference point 1 of the mobile base station 1 and the user terminal 102.
　図８は、実施例１に係る第１の距離、及び第２の距離について説明するための図である。制御装置１０は、可動基地局１とユーザ端末１０２との間の距離が、第１の距離Ｄ１以下である場合、通信品質が十分に良いと判断し、可動基地局１に移動を指示しない。一方、制御装置１０は、可動基地局１とユーザ端末１０２との間の距離が、第１の距離Ｄ１を超えた場合、可動基地局１とユーザ端末１０２との間の距離が、第１の距離Ｄ１以下となるように、可動基地局１に移動を指示する。 FIG. 8 is a diagram for explaining the first distance and the second distance according to the first embodiment. If the distance between mobile base station 1 and user terminal 102 is less than first distance D1, control device 10 determines that the communication quality is sufficiently good and does not instruct mobile base station 1 to move. On the other hand, when the distance between the mobile base station 1 and the user terminal 102 exceeds the first distance D1, the control device 10 reduces the distance between the mobile base station 1 and the user terminal 102 to the first distance D1. The movable base station 1 is instructed to move so that the distance is less than or equal to D1.
　ただし、本実施形態では、可動基地局１が、可動基地局１の移動範囲の中心である基準点１から移動可能な第２の距離Ｄ２が予め設定されている。制御装置１０は、基準点１とユーザ端末１０２との間の距離Ｙ１が、第２の距離Ｄ２以下である場合、可動基地局１とユーザ端末１０２との距離Ｘ１が第１の距離Ｄ１以下となるように、可動基地局１に移動を指示する。一方、制御装置１０は、基準点１とユーザ端末１０２との間の距離Ｙ１が、第２の距離Ｄ２を超えた場合、他の可動基地局２とユーザ端末１０２との距離Ｘ２が第１の距離Ｄ１以下となるように、可動基地局２に移動を指示する。 However, in the present embodiment, a second distance D2 by which the mobile base station 1 can move from the reference point 1, which is the center of the mobile base station 1's movement range, is set in advance. When the distance Y1 between the reference point 1 and the user terminal 102 is less than or equal to the second distance D2, the control device 10 determines that the distance X1 between the mobile base station 1 and the user terminal 102 is less than or equal to the first distance D1. The mobile base station 1 is instructed to move so that On the other hand, when the distance Y1 between the reference point 1 and the user terminal 102 exceeds the second distance D2, the control device 10 determines that the distance X2 between the other movable base station 2 and the user terminal 102 is the first distance D2. The movable base station 2 is instructed to move so that the distance is less than or equal to D1.
　ここで、図７に戻り、フローチャートの説明を続ける。図７のステップＳ７０５において、制御装置１０は、第２の算出部６０４が算出した距離Ｙ１が、第２の距離Ｄ２以下であるか否かを判断する。距離Ｙ１が第２の距離Ｄ２以下である場合、制御装置１０は、処理をステップＳ７０６に移行させる。一方、距離Ｙ１が第２の距離Ｄ２を超えた場合、制御装置１０は、処理をステップＳ７０８に移行させる。 Here, returning to FIG. 7, the explanation of the flowchart is continued. In step S705 of FIG. 7, the control device 10 determines whether or not the distance Y1 calculated by the second calculator 604 is equal to or less than the second distance D2. If the distance Y1 is less than or equal to the second distance D2, the control device 10 causes the process to proceed to step S706. On the other hand, when the distance Y1 exceeds the second distance D2, the control device 10 shifts the process to step S708.
　ステップＳ７０６に移行すると、制御装置１０の移動指示部６０５は、ユーザ端末１０２との間の距離が第１の距離Ｄ１以下となる可動基地局１の移動候補地点のうち、ユーザ端末１０２からの距離が最短の移動候補地点、又は可動基地局１からの距離が最短の可動候補地点を選択する。 In step S706, the movement instruction unit 605 of the control device 10 selects the distance from the user terminal 102 among the movement candidate points of the movable base station 1 whose distance from the user terminal 102 is equal to or less than the first distance D1. , or the movable candidate point with the shortest distance from the mobile base station 1 is selected.
　図９は、第１の実施形態に係る移動候補地点の選択方法の例について説明するための図（１）である。第１の実施形態に係る可動基地局１００－１は、例えば、図９に示すような、複数の移動候補地点９０１を有している。また、図９に示すように、ユーザ端末１０２が、第１の距離Ｄ１を超えて移動した場合、制御装置１０の移動指示部６０５は、ユーザ端末１０２との間の距離が第１の距離Ｄ１以下となる移動候補地点９０１ａ、９０１ｂから、１つの移動候補地点を選択する。 FIG. 9 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment. The movable base station 100-1 according to the first embodiment has, for example, a plurality of movement candidate points 901 as shown in FIG. Further, as shown in FIG. 9, when the user terminal 102 moves beyond the first distance D1, the movement instruction unit 605 of the control device 10 determines that the distance from the user terminal 102 is the first distance D1. One moving candidate point is selected from the following moving candidate points 901a and 901b.
　一例として、移動指示部６０５は、移動候補地点９０１ａ、９０１ｂのうち、ユーザ端末１０２からの距離が最短の移動候補地点を選択する。好ましくは、ユーザ端末１０２からの距離が最短の複数の移動候補地点（例えば移動候補地点９０１ａ、９０１ｂ）がある場合、移動指示部６０５は、可動基地局１００－１からの移動距離がより短い移動候補地点９０１ａを選択する。別の一例として、移動指示部６０５は、移動候補地点９０１ａ、９０１ｂのうち、可動基地局１００１－１からの移動距離がより短い移動候補地点９０１ａを初めから選択してもよい。 As an example, the movement instruction unit 605 selects the movement candidate point with the shortest distance from the user terminal 102 from the movement candidate points 901a and 901b. Preferably, when there are a plurality of movement candidate points (for example, movement candidate points 901a and 901b) with the shortest distance from the user terminal 102, the movement instruction unit 605 selects a movement point with a shorter movement distance from the movable base station 100-1. Select the candidate point 901a. As another example, the movement instruction unit 605 may select from the beginning the movement candidate point 901a, which has the shortest movement distance from the mobile base station 1001-1, from the movement candidate points 901a and 901b.
　ここで、再び図７に戻り、フローチャートの説明を続ける。図７のステップＳ７０７において、移動指示部６０５は、可動基地局１に、ステップＳ７０６で選択した移動候補地点への移動を指示する。 Here, returning to FIG. 7 again, the explanation of the flowchart is continued. In step S707 of FIG. 7, the movement instruction unit 605 instructs the mobile base station 1 to move to the movement candidate point selected in step S706.
　一方、ステップＳ７０５からステップＳ７０８に移行すると、移動指示部６０５は、ユーザ端末１０２との間の距離が第１の距離Ｄ１以下となる可動基地局２の移動候補地点のうち、ユーザ端末１０２からの距離が最短の移動候補地点、又は可動基地局２からの移動距離が最短の移動候補地点を選択する。 On the other hand, when the process proceeds from step S705 to step S708, the movement instructing unit 605 selects the movement candidate points from the user terminal 102 among the movement candidate points of the movable base station 2 whose distance from the user terminal 102 is the first distance D1 or less. The movement candidate point with the shortest distance or the movement candidate point with the shortest movement distance from the movable base station 2 is selected.
　図１０は、第１の実施形態に係る移動候補地点の選択方法の例について説明するための図（１）である。第１の実施形態に係る他の可動基地局１００－２も、図１０に示すような、複数の移動候補地点９０１を有している。また、ユーザ端末１０２が、第２の距離Ｄ２を超えて移動した場合、移動指示部６０５は、可動基地局１００－２の複数の移動候補地点９０１ｃ、９０１ｄから、１つの移動候補地点を選択する。 FIG. 10 is a diagram (1) for explaining an example of a method of selecting movement candidate points according to the first embodiment. Another movable base station 100-2 according to the first embodiment also has a plurality of movement candidate points 901 as shown in FIG. Also, when the user terminal 102 moves beyond the second distance D2, the movement instruction unit 605 selects one movement candidate point from the plurality of movement candidate points 901c and 901d of the mobile base station 100-2. .
　一例として、移動指示部６０５は、移動候補地点９０１ｃ、９０１ｄのうち、ユーザ端末１０２からの距離が最短の移動候補地点を選択する。好ましくは、ユーザ端末１０２からの距離が最短の複数の移動候補地点（例えば移動候補地点９０１ｃ、９０１ｄ）がある場合、移動指示部６０５は、可動基地局１００－２からの移動距離がより短い移動候補地点９０１ｃを選択する。別の一例として、移動指示部６０５は、移動候補地点９０１ｃ、９０１ｄのうち、可動基地局１００１－１からの移動距離がより短い移動候補地点９０１ｃを初めから選択してもよい。 As an example, the movement instruction unit 605 selects the movement candidate point with the shortest distance from the user terminal 102 from the movement candidate points 901c and 901d. Preferably, when there are a plurality of movement candidate points (for example, movement candidate points 901c and 901d) with the shortest distance from the user terminal 102, the movement instruction unit 605 selects a movement point with a shorter movement distance from the movable base station 100-2. Select the candidate point 901c. As another example, the movement instruction unit 605 may initially select the movement candidate point 901c, which has the shortest movement distance from the mobile base station 1001-1, from the movement candidate points 901c and 901d.
　図７のステップＳ７０９において、移動指示部６０５は、可動基地局２に、ステップＳ７０８で選択した移動候補地点への移動を指示する。 At step S709 in FIG. 7, the movement instruction unit 605 instructs the mobile base station 2 to move to the movement candidate point selected at step S708.
　図７の処理を繰り返し実行することにより、制御装置１０は、可動基地局１００とユーザ端末１０２との間の距離が第１の距離Ｄ１以下となるように複数の可動基地局１００を制御することができる。 By repeatedly executing the processing of FIG. 7, the control device 10 controls the plurality of mobile base stations 100 so that the distance between the mobile base station 100 and the user terminal 102 is equal to or less than the first distance D1. can be done.
　［実施例２］
　実施例１では、可動基地局１００が複数の移動候補地点を有する場合の処理の例について説明したが、これは一例である。例えば、可動基地局１００は、通路、又は軌道等の所定の経路に沿って自由に移動可能なものであってもよい。 [Example 2]
In the first embodiment, an example of processing when the mobile base station 100 has a plurality of movement candidate points has been described, but this is just an example. For example, mobile base station 100 may be freely movable along a predetermined path such as a corridor or track.
　図１１は、実施例２に係る制御装置の処理の例を示すフローチャートである。この処理は、例えば、図６で説明した機能構成を有する制御装置１０が実行する処理の別の一例を示している。なお、図１１に示す処理のうち、ステップＳ７０１～Ｓ７０４の処理は、図７で説明した実施例１に係る制御装置の処理と同様なので、ここでは説明を省略する。 FIG. 11 is a flowchart illustrating an example of processing of the control device according to the second embodiment. This process represents another example of the process executed by the control device 10 having the functional configuration described with reference to FIG. 6, for example. 11, the processing of steps S701 to S704 is the same as the processing of the control device according to the first embodiment described with reference to FIG. 7, so description thereof will be omitted here.
　ステップＳ１１０１において、制御装置１０は、第２の算出部６０４が算出した距離Ｙ１が、第２の距離Ｄ２以下であるか否かを判断する。距離Ｙ１が第２の距離Ｄ２以下である場合、制御装置１０は、処理をステップＳ１１０２に移行させる。一方、距離Ｙ１が第２の距離Ｄ２を超えた場合、制御装置１０は、処理をステップＳ１１０４に移行させる。 In step S1101, the control device 10 determines whether or not the distance Y1 calculated by the second calculation unit 604 is less than or equal to the second distance D2. If the distance Y1 is less than or equal to the second distance D2, the control device 10 causes the process to proceed to step S1102. On the other hand, when the distance Y1 exceeds the second distance D2, the control device 10 shifts the process to step S1104.
　ステップＳ１１０２に移行すると、制御装置１０の移動指示部６０５は、ユーザ端末１０２との間の距離が第１の距離Ｄ１以下となる可動基地局１の移動地点を決定する。例えば、可動基地局１が、所定の経路上を自由に移動できる場合、移動指示部６０５は、所定の経路上のうち、ユーザ端末１０２との間の距離が最短（又は所定の距離以内）となる地点を、可動基地局１の移動地点として決定してもよい。或いは、移動指示部６０５は、ユーザ端末１０２との間の距離が、予め設定された第３の距離Ｄ３（Ｄ３＜Ｄ１）以下となる地点のうち、可動基地局１の移動距離が最短となる地点を、可動基地局１の移動地点として決定してもよい。さらに、移動指示部６０５は、実施例１と同様の方法により、可動基地局１の移動地点を選択してもよい。 After moving to step S1102, the movement instruction unit 605 of the control device 10 determines the movement point of the mobile base station 1 where the distance from the user terminal 102 is equal to or less than the first distance D1. For example, when the movable base station 1 can move freely on a predetermined route, the movement instruction unit 605 determines that the distance to the user terminal 102 is the shortest (or within a predetermined distance) on the predetermined route. may be determined as the moving point of the mobile base station 1 . Alternatively, the movement instruction unit 605 makes the movement distance of the movable base station 1 the shortest among the points where the distance to the user terminal 102 is equal to or less than a preset third distance D3 (D3<D1). The point may be determined as the moving point of the mobile base station 1 . Furthermore, the movement instruction unit 605 may select the movement point of the mobile base station 1 by the same method as in the first embodiment.
　ステップＳ１１０３において、移動指示部６０５は、可動基地局１に、ステップＳ１１０２で決定した移動候補地点への移動を指示する。 In step S1103, the movement instruction unit 605 instructs the movable base station 1 to move to the movement candidate point determined in step S1102.
　一方、ステップＳ１１０１からステップＳ１１０４に移行すると、移動指示部６０５は、可動基地局１とは異なる他の可動基地局１００のうち、ユーザ端末１０２との間の距離Ｘが、第１の距離Ｄ１以下となる位置へ移動可能な他の可動基地局１００を検索する。例えば、制御装置１０は、各可動基地局１００が移動可能な範囲を、基地局情報６０８等に予め記憶しておく。また、移動指示部６０５は、各可動基地局１００が移動可能な範囲と、ユーザ端末１０２の位置情報とを用いて、ユーザ端末１０２との間の距離Ｘが第１の距離Ｄ１以下となる位置へ移動可能な他の可動基地局１００を検索する。 On the other hand, when the process moves from step S1101 to step S1104, the movement instructing unit 605 determines that the distance X between the user terminal 102 among the other mobile base stations 100 different from the mobile base station 1 is the first distance D1 or less. A search is made for other mobile base stations 100 that can move to the position where For example, the control device 10 stores in advance the range in which each mobile base station 100 can move in the base station information 608 or the like. In addition, movement instruction section 605 uses the movable range of each mobile base station 100 and the position information of user terminal 102 to determine the position where distance X from user terminal 102 is equal to or less than first distance D1. search for other mobile base stations 100 that can move to
　ステップＳ１１０５において、移動指示部６０５は、ステップＳ１１０４の条件を満たす可動基地局１００があるか否かを判断する。上記の条件を満たす可動基地局１００がある場合、移動指示部６０５は、処理をステップＳ１１０６に移行させる。一方、上記の条件を満たす可動基地局１００がない場合、移動指示部６０５は、処理を終了する。 In step S1105, the movement instruction unit 605 determines whether or not there is a mobile base station 100 that satisfies the conditions in step S1104. If there is a mobile base station 100 that satisfies the above conditions, the movement instruction unit 605 shifts the process to step S1106. On the other hand, if there is no mobile base station 100 that satisfies the above conditions, the movement instruction unit 605 terminates the process.
　ステップＳ１１０６に移行すると、移動指示部６０５は、上記の条件を満たす１つの可動基地局Ｚを選択し、ユーザ端末１０２との間の距離が第１の距離以下となる可動基地局Ｚの移動地点を決定する。なお、可動基地局Ｚの移動地点の決定方法は、ステップＳ１１０２と同様でよい。 In step S1106, the movement instruction unit 605 selects one mobile base station Z that satisfies the above conditions, and moves the mobile base station Z to a point where the distance from the user terminal 102 is equal to or less than the first distance. to decide. Note that the method of determining the moving point of the mobile base station Z may be the same as in step S1102.
　図１２は、実施例２に係る無線通信システムの処理のイメージを示す図である。上記のステップＳ１１０４、Ｓ１１０５の処理により、図１２に示すように、ユーザ端末１０２が、可動基地局１００－２のカバーエリア１０１－２ではなく、例えば、可動基地局１００－Ｚのカバーエリア１０１－Ｚへ移動した場合でも、可動基地局１００－Ｚを、ユーザ端末１０２との間の距離が第１の距離Ｄ１以下となるように制御することができる。 FIG. 12 is a diagram showing an image of processing of the wireless communication system according to the second embodiment. As a result of the processing in steps S1104 and S1105 described above, as shown in FIG. 12, the user terminal 102 is not in the coverage area 101-2 of the mobile base station 100-2, but in the coverage area 101-2 of the mobile base station 100-Z, for example. Even when moving to Z, mobile base station 100-Z can be controlled so that the distance to user terminal 102 is less than or equal to first distance D1.
　なお、ユーザ端末１０２の移動先に複数の可動基地局１００のカバーエリアがある場合、移動指示部６０５は、例えば、ユーザ端末１０２との間の距離がより短い１つの可動基地局１００を選択してもよいし、ランダムに１つの可動基地局１００を選択してもよい。 Note that if the destination of the user terminal 102 is covered by a plurality of mobile base stations 100, the movement instruction unit 605 selects one mobile base station 100 with a shorter distance to the user terminal 102, for example. Alternatively, one mobile base station 100 may be selected at random.
　図１１のステップＳ１１０７において、移動指示部６０５は、可動基地局Ｚに、ステップＳ１１０６で決定した移動候補地点への移動を指示する。 In step S1107 of FIG. 11, the movement instruction unit 605 instructs the movable base station Z to move to the movement candidate point determined in step S1106.
　図１１の処理を繰り返し実行することにより、制御装置１０は、可動基地局１００とユーザ端末１０２との間の距離が第１の距離Ｄ１以下となるように複数の可動基地局１００を制御することができる。 By repeatedly executing the processing of FIG. 11, the control device 10 controls the plurality of mobile base stations 100 so that the distance between the mobile base station 100 and the user terminal 102 is equal to or less than the first distance D1. can be done.
　＜ハードウェア構成例＞
　図１３は、本実施形態に係る制御装置、可動基地局、及びユーザ端末のハードウェア構成の例を示す図である。制御装置１０、可動基地局１００、及びユーザ端末１０２は、例えば、図１３に示すようなコンピュータ１３００の構成を備えている。なお、可動基地局１００は、コンピュータ１３００の構成を備える無線基地局を、コンピュータ１３００からの制御に従って移動する可動装置に搭載した構成を有する。 <Hardware configuration example>
FIG. 13 is a diagram showing an example of the hardware configuration of the control device, movable base station, and user terminal according to this embodiment. The control device 10, mobile base station 100, and user terminal 102 have, for example, the configuration of a computer 1300 as shown in FIG. Mobile base station 100 has a configuration in which a wireless base station having the configuration of computer 1300 is mounted on a mobile device that moves according to control from computer 1300 .
　図１３の例では、コンピュータ１３００は、プロセッサ１３０１、メモリ１３０２、ストレージデバイス１３０３、通信装置１３０４、入力装置１３０５、出力装置１３０６、及びバスＢ等を有する。 In the example of FIG. 13, the computer 1300 has a processor 1301, a memory 1302, a storage device 1303, a communication device 1304, an input device 1305, an output device 1306, a bus B, and the like.
　プロセッサ１３０１は、例えば、所定のプログラムを実行することにより、様々な機能を実現するＣＰＵ（Central Processing Unit）等の演算装置である。メモリ１３０２は、コンピュータ１３００が読み取り可能な記憶媒体であり、例えば、ＲＡＭ（Random Access Memory）、ＲＯＭ（Read Only Memory）等を含む。ストレージデバイス１３０３は、コンピュータ読み取り可能な記憶媒体であり、例えば、ＨＤＤ（Hard Disk Drive）、ＳＳＤ（Solid State Drive）、各種の光ディスク、及び光磁気ディスク等を含み得る。 The processor 1301 is, for example, an arithmetic device such as a CPU (Central Processing Unit) that implements various functions by executing a predetermined program. The memory 1302 is a storage medium readable by the computer 1300, and includes, for example, RAM (Random Access Memory), ROM (Read Only Memory), and the like. The storage device 1303 is a computer-readable storage medium, and may include, for example, HDDs (Hard Disk Drives), SSDs (Solid State Drives), various optical discs, and magneto-optical discs.
　通信装置１３０４は、無線、又は有線のネットワークを介して他の装置と通信を行うための１つ以上のハードウェア（通信デバイス）を含む。入力装置１３０５は、外部からの入力を受け付ける入力デバイス（例えば、キーボード、マウス、マイクロフォン、スイッチ、ボタン、センサ等）である。出力装置１３０６は、外部への出力を実施する出力デバイス（例えば、ディスプレイ、スピーカ、ＬＥＤランプ等）である。なお、入力装置１３０５と出力装置１３０６とは、一体となった構成（例えば、タッチパネルディスプレイ等の入出力装置）であってもよい。 The communication device 1304 includes one or more pieces of hardware (communication devices) for communicating with other devices via a wireless or wired network. The input device 1305 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1306 is an output device (for example, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1305 and the output device 1306 may be integrated (for example, an input/output device such as a touch panel display).
　バスＢは、上記の各構成要素に共通に接続され、例えば、アドレス信号、データ信号、及び各種の制御信号等を伝送する。なお、プロセッサ１３０１は、ＣＰＵに限られず、例えば、ＤＳＰ（Digital Signal Processor）、ＰＬＤ（Programmable Logic Device）、又はＦＰＧＡ（Field Programmable Gate Array）等であってもよい。 A bus B is commonly connected to each of the components described above, and transmits, for example, address signals, data signals, and various control signals. Note that the processor 1301 is not limited to a CPU, and may be, for example, a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).
　（補足）
　本実施形態における制御装置１０、及び可動基地局１００は専用装置による実現に限らず、汎用コンピュータで実現するようにしてもよい。その場合、この機能を実現するためのプログラムをコンピュータ読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータシステムに読み込ませ、実行することによって実現してもよい。なお、ここでいう「コンピュータシステム」とは、ＯＳや周辺機器等のハードウェアを含むものとする。 (supplement)
The control device 10 and the mobile base station 100 in this embodiment are not limited to being realized by a dedicated device, and may be realized by a general-purpose computer. In that case, a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read into a computer system and executed. It should be noted that the "computer system" referred to here includes hardware such as an OS and peripheral devices.
　また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ＲＯＭ、ＣＤ－ＲＯＭ等の可搬媒体、コンピュータシステムに内蔵されるハードディスク等の様々な記憶装置を含む。さらに「コンピュータ読み取り可能な記録媒体」とは、インターネット等のネットワークや電話回線等の通信回線を介してプログラムを送信する場合の通信線のように、短時間の間、動的にプログラムを保持するもの、その場合のサーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時間プログラムを保持しているものも含んでもよい。 In addition, "computer-readable recording medium" includes various storage devices such as portable media such as flexible disks, magneto-optical disks, ROMs and CD-ROMs, and hard disks built into computer systems. Furthermore, "computer-readable recording medium" refers to a program that dynamically retains programs for a short period of time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include something that holds the program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in that case.
　また上記プログラムは、前述した機能の一部を実現するためのものであっても良く、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるものであっても良く、ＰＬＤ（Programmable Logic Device）やＦＰＧＡ（Field Programmable Gate Array）等のハードウェアを用いて実現されるものであってもよい。 Further, the above program may be for realizing part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in a computer system, It may be implemented using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).
　＜実施形態の効果＞
　本実施形態によれば、可動基地局１００を含む無線通信システム１において、ユーザ端末１０２が移動したときに、例えば、図２～５で説明したように無線リンクの維持が容易になる。 <Effects of Embodiment>
According to this embodiment, in the wireless communication system 1 including the mobile base station 100, when the user terminal 102 moves, it becomes easy to maintain the wireless link as described with reference to FIGS. 2 to 5, for example.
　例えば、制御装置１０は、図２、３で説明したように、可動基地局１００－１のカバーエリア１０１－１を移動するユーザ端末１０２に合わせて、可動基地局１００－１を追従して移動させることができる。また、制御装置１０は、例えば、図４、５で説明したように、隣接又は近接する他の可動基地局１００－２のカバーエリア１０１－２へ移動したユーザ端末１０２に合わせて、可動基地局１００－２を追従して移動させることができる。これにより、ユーザ端末１０２が移動しても、必要な通信品質を維持し、通信が途切れることを抑制することができる。 For example, as described with reference to FIGS. 2 and 3, the control device 10 moves following the mobile base station 100-1 in accordance with the user terminal 102 moving in the coverage area 101-1 of the mobile base station 100-1. can be made Also, the control device 10, for example, as described with reference to FIGS. 100-2 can be followed and moved. Thereby, even if the user terminal 102 moves, it is possible to maintain the required communication quality and prevent the communication from being interrupted.
　＜実施形態のまとめ＞
　本明細書には、少なくとも下記各項の無線通信方法、及び無線通信システムが開示されている。
（第１項）
　可動基地局を制御する制御装置が、
　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得する取得処理と、
　前記可動基地局と前記ユーザ端末との間の距離を算出する第１の算出処理と、
　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示する移動指示処理と、
　を実行する、制御方法。
（第２項）
　前記可動基地局は、移動可能な複数の移動候補地点を有し、
　前記移動指示処理は、前記ユーザ端末との間の距離が前記第１の距離以下の前記移動候補地点のうち、前記ユーザ端末からの距離が最短の移動候補地点、又は前記可動基地局からの移動距離が最短の移動候補地点への移動を前記可動基地局へ指示する、第１項に記載の制御方法。
（第３項）
　前記移動指示処理は、前記ユーザ端末が、前記可動基地局が前記ユーザ端末に追従して移動可能な範囲内にある場合、前記可動基地局に前記移動を指示する、第１項又は第２項に記載の制御方法。
（第４項）
　前記取得処理は、前記可動基地局に隣接又は近接する他の可動基地局の位置情報を取得し、
　前記移動指示処理は、前記ユーザ端末が、前記可動基地局が前記ユーザ端末に追従して移動可能な範囲外に移動した場合、前記他の可動基地局に、前記他の可動基地局と前記ユーザ端末との間の距離が前記第１の距離以下となるように移動を指示する、第１項乃至第３項のいずれか一項に記載の制御方法。
（第５項）
前記移動指示処理は、前記他の可動基地局のうち、前記ユーザ端末と間の距離が、前記第１の距離以下となる位置へ移動可能な他の可動基地局に前記移動を指示する、第４項に記載の制御方法。
（第６項）
　前記制御装置が、
　前記可動基地局と前記ユーザ端末との間の距離が前記第１の距離を超えた場合、前記可動基地局が移動可能な範囲の基準となる基準点と前記ユーザ端末との間の距離を算出する第２の算出処理を実行し、
　前記移動指示処理は、前記基準点と前記ユーザ端末との間の距離が、予め設定した第２の距離を超えた場合、前記他の可動基地局に前記移動を指示する、第４項又は第５項に記載の制御方法。
（第７項）
　可動基地局を制御する制御装置であって、
　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得するように構成された取得部と、
　前記可動基地局と前記ユーザ端末との間の距離を算出するように構成された第１の算出部と、
　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示するように構成された移動指示部と、
　を有する、制御装置。
（第８項）
　無線基地局を可動装置に搭載した可動基地局と、前記可動基地局を制御する制御装置とを含む通信システムであって、
　前記制御装置は、
　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得するように構成された取得部と、
　前記可動基地局と前記ユーザ端末との間の距離を算出するように構成された第１の算出部と、
　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示するように構成された移動指示部と、
　を有し、
　前記可動基地局は、前記制御装置から指示された地点に、前記可動基地局を移動するように構成された移動制御部を有する、無線通信システム。 <Summary of embodiment>
This specification discloses at least the following wireless communication methods and wireless communication systems.
(Section 1)
A control device that controls the mobile base station,
Acquisition processing for acquiring location information of the movable base station and the user terminal that wirelessly communicates with the movable base station;
a first calculation process for calculating the distance between the movable base station and the user terminal;
movement instruction processing for instructing the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
control method.
(Section 2)
The mobile base station has a plurality of moveable candidate moving points,
In the movement instruction process, among the movement candidate points whose distance from the user terminal is equal to or less than the first distance, movement from the movable base station or the movement candidate point with the shortest distance from the user terminal is performed. 2. The control method according to claim 1, wherein the movable base station is instructed to move to a movement candidate point having the shortest distance.
(Section 3)
Item 1 or 2, wherein the move instruction process instructs the moveable base station to move when the user terminal is within a range in which the moveable base station can move following the user terminal. The control method described in .
(Section 4)
The acquisition process acquires position information of other mobile base stations adjacent or close to the mobile base station,
In the movement instruction process, when the user terminal moves out of a range in which the movable base station can follow the user terminal, the other movable base station instructs the other movable base station and the user terminal to move. 4. The control method according to any one of items 1 to 3, wherein the movement is instructed so that the distance to the terminal is equal to or less than the first distance.
(Section 5)
In the movement instruction processing, among the other movable base stations, the other movable base station capable of moving to a position where the distance from the user terminal is equal to or less than the first distance is instructed to move. The control method according to item 4.
(Section 6)
The control device
When the distance between the movable base station and the user terminal exceeds the first distance, calculate the distance between the user terminal and a reference point that serves as a reference for the range in which the movable base station can move. Execute the second calculation process to
Item 4 or 3, wherein the move instruction processing instructs the other movable base station to move when the distance between the reference point and the user terminal exceeds a preset second distance. The control method according to item 5.
(Section 7)
A control device for controlling a mobile base station,
an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station;
a first calculator configured to calculate a distance between the mobile base station and the user terminal;
a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
A control device having a
(Section 8)
A communication system including a mobile base station having a radio base station mounted on a mobile device and a control device for controlling the mobile base station,
The control device is
an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station;
a first calculator configured to calculate a distance between the mobile base station and the user terminal;
a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
has
The wireless communication system, wherein the movable base station has a movement control unit configured to move the movable base station to a point indicated by the control device.
　以上、本実施形態について説明したが、本発明はかかる特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. is.
　１　無線通信システム
　１０　制御装置
　１００、１００－１、１００－２、１００－３　可動基地局
　１０２　ユーザ端末
　６０２　取得部
　６０３　第１の算出部
　６０４　第２の算出部
　６０５　移動指示部
　６２３　位置情報送信部
　６２４　移動制御部 1 wireless communication system 10 control device 100, 100-1, 100-2, 100-3 movable base station 102 user terminal 602 acquisition unit 603 first calculation unit 604 second calculation unit 605 movement instruction unit 623 location information transmission unit 624 movement control unit

Claims (8)

  1. 　可動基地局を制御する制御装置が、
    　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得する取得処理と、
    　前記可動基地局と前記ユーザ端末との間の距離を算出する第１の算出処理と、
    　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示する移動指示処理と、
    　を実行する、制御方法。     A control device that controls the mobile base station,
    Acquisition processing for acquiring location information of the movable base station and the user terminal that wirelessly communicates with the movable base station;
    a first calculation process for calculating the distance between the movable base station and the user terminal;
    movement instruction processing for instructing the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
    control method.
  2. 　前記可動基地局は、移動可能な複数の移動候補地点を有し、
    　前記移動指示処理は、前記ユーザ端末との間の距離が前記第１の距離以下の前記移動候補地点のうち、前記ユーザ端末からの距離が最短の移動候補地点、又は前記可動基地局からの移動距離が最短の移動候補地点への移動を前記可動基地局へ指示する、請求項１に記載の制御方法。     The mobile base station has a plurality of moveable candidate moving points,
    In the movement instruction process, among the movement candidate points whose distance from the user terminal is equal to or less than the first distance, movement from the movable base station or the movement candidate point with the shortest distance from the user terminal is performed. 2. The control method according to claim 1, further comprising instructing said movable base station to move to a movement candidate point having the shortest distance.
  3. 　前記移動指示処理は、前記ユーザ端末が、前記可動基地局が前記ユーザ端末に追従して移動可能な範囲内にある場合、前記可動基地局に前記移動を指示する、請求項１又は２に記載の制御方法。 3. The movement instruction process according to claim 1, wherein when the user terminal is within a range in which the mobile base station can move following the user terminal, the mobile base station is instructed to move. control method.
  4. 　前記取得処理は、前記可動基地局に隣接又は近接する他の可動基地局の位置情報を取得し、
    　前記移動指示処理は、前記ユーザ端末が、前記可動基地局が前記ユーザ端末に追従して移動可能な範囲外に移動した場合、前記他の可動基地局に、前記他の可動基地局と前記ユーザ端末との間の距離が前記第１の距離以下となるように移動を指示する、請求項１乃至３のいずれか一項に記載の制御方法。     The acquisition process acquires position information of other mobile base stations adjacent or close to the mobile base station,
    In the movement instruction process, when the user terminal moves out of a range in which the movable base station can follow the user terminal, the other movable base station instructs the other movable base station and the user terminal to move. 4. The control method according to any one of claims 1 to 3, wherein the movement is instructed so that the distance to the terminal is equal to or less than the first distance.
  5. 　前記移動指示処理は、前記他の可動基地局のうち、前記ユーザ端末と間の距離が、前記第１の距離以下となる位置へ移動可能な他の可動基地局に前記移動を指示する、請求項４に記載の制御方法。 wherein said movement instruction processing instructs said other movable base station, among said other movable base stations, to move to a position where the distance from said user terminal is equal to or less than said first distance, among said other movable base stations. Item 5. The control method according to item 4.
  6. 　前記制御装置が、
    　前記可動基地局と前記ユーザ端末との間の距離が前記第１の距離を超えた場合、前記可動基地局が移動可能な範囲の基準となる基準点と前記ユーザ端末との間の距離を算出する第２の算出処理を実行し、
    　前記移動指示処理は、前記基準点と前記ユーザ端末との間の距離が、予め設定した第２の距離を超えた場合、前記他の可動基地局に前記移動を指示する、請求項４又は５に記載の制御方法。     The control device
    When the distance between the movable base station and the user terminal exceeds the first distance, calculate the distance between the user terminal and a reference point that serves as a reference for the range in which the movable base station can move. Execute the second calculation process to
    6. When the distance between said reference point and said user terminal exceeds a preset second distance, said movement instruction processing instructs said other mobile base station to move. The control method described in .
  7. 　可動基地局を制御する制御装置であって、
    　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得するように構成された取得部と、
    　前記可動基地局と前記ユーザ端末との間の距離を算出するように構成された第１の算出部と、
    　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示するように構成された移動指示部と、
    　を有する、制御装置。     A control device for controlling a mobile base station,
    an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station;
    a first calculator configured to calculate a distance between the mobile base station and the user terminal;
    a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
    A control device having a
  8. 　無線基地局を可動装置に搭載した可動基地局と、前記可動基地局を制御する制御装置とを含む通信システムであって、
    　前記制御装置は、
    　前記可動基地局、及び前記可動基地局と無線通信を行うユーザ端末の位置情報を取得するように構成された取得部と、
    　前記可動基地局と前記ユーザ端末との間の距離を算出するように構成された第１の算出部と、
    　前記可動基地局と前記ユーザ端末との間の距離が、予め設定した第１の距離以下となるように、前記可動基地局に移動を指示するように構成された移動指示部と、
    　を有し、
    　前記可動基地局は、前記制御装置から指示された地点に、前記可動基地局を移動するように構成された移動制御部を有する、無線通信システム。     A communication system including a mobile base station having a radio base station mounted on a mobile device and a control device for controlling the mobile base station,
    The control device is
    an acquisition unit configured to acquire location information of the mobile base station and a user terminal that wirelessly communicates with the mobile base station;
    a first calculator configured to calculate a distance between the mobile base station and the user terminal;
    a movement instruction unit configured to instruct the mobile base station to move so that the distance between the mobile base station and the user terminal is equal to or less than a preset first distance;
    has
    The wireless communication system, wherein the movable base station has a movement control unit configured to move the movable base station to a point indicated by the control device.
PCT/JP2021/045880 2021-12-13 2021-12-13 Control method, control device, and radio communication system WO2023112097A1 (en)

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