WO2022269840A1 - 制御装置、通信システム、制御方法、及びプログラム - Google Patents
制御装置、通信システム、制御方法、及びプログラム Download PDFInfo
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- WO2022269840A1 WO2022269840A1 PCT/JP2021/023869 JP2021023869W WO2022269840A1 WO 2022269840 A1 WO2022269840 A1 WO 2022269840A1 JP 2021023869 W JP2021023869 W JP 2021023869W WO 2022269840 A1 WO2022269840 A1 WO 2022269840A1
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- base station
- specific priority
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- priority terminal
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- 238000004891 communication Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims description 27
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- 230000005540 biological transmission Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/026—Route selection considering the moving speed of individual devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/20—Communication route or path selection, e.g. power-based or shortest path routing based on geographic position or location
- H04W40/205—Communication route or path selection, e.g. power-based or shortest path routing based on geographic position or location using topographical information, e.g. hills, high rise buildings
Definitions
- the present invention relates to a method of controlling a base station in a wireless communication system. .
- Non-Patent Document 1 Japanese Patent Document 1
- a surveillance camera terminal an example of a specific priority terminal
- a high frequency band to upload large amounts of data.
- the quality of communication is not stable inside a factory where there are many shields and the shields move.
- radio waves in high-frequency bands such as 5G travel in a straight line and suffer large losses due to shielding.
- the present invention has been made in view of the above points, and aims to provide a technology that enables the maintenance of regular communication of a specific priority terminal even in an environment where there is a shield.
- the control device in a communication system comprising a control device and a mobile base station, an information acquisition unit that acquires the location information of the specific priority terminal and the shield sensing information; a shield map generation unit that generates a shield map based on the shield sensing information; a line-of-sight determination unit that determines whether or not there is line-of-sight from the antenna of the mobile base station to the specific priority terminal based on the location information and the shield map; a base station control unit that controls the mobile base station so that the specific priority terminal is in line of sight from the antenna when communication by the specific priority terminal is not detected for a predetermined period of time. is provided.
- FIG. 2 is a diagram for explaining mobile base station 100.
- FIG. It is a figure which shows the structure of each apparatus in a communication system.
- 4 is a flow chart for explaining the operation of the communication system;
- FIG. 4 is a diagram showing an example of control of mobile base stations;
- a specific priority terminal is, for example, a surveillance camera terminal that can store video data for about an hour. If the specific priority terminal is a surveillance camera terminal, in the above use case, the surveillance camera terminal needs to enter the high-frequency band area periodically, for example, once an hour to upload a large amount of data. be. However, in a factory with many shields and moving shields, communication is interrupted, making it difficult to perform regular uploads as described above. Therefore, in this embodiment, regular communication is maintained by controlling the position and direction of the antenna of the mobile base station.
- the control device 300 which will be described later, executes the control for maintaining the regular communication of the specific priority terminal.
- the outline of control is as follows.
- the control device 300 Based on shielding object sensing information (camera image information, LiDAR information, etc.) and position information of the specific priority terminal, the control device 300 sets parameters indicating the position and direction of the antenna of the mobile base station where the specific priority terminal is in line of sight. It calculates and holds the calculated information in the storage unit.
- shielding object sensing information camera image information, LiDAR information, etc.
- position information of the specific priority terminal the control device 300 sets parameters indicating the position and direction of the antenna of the mobile base station where the specific priority terminal is in line of sight. It calculates and holds the calculated information in the storage unit.
- the control apparatus 300 determines that the specific priority terminal is in line of sight.
- the mobile base station is controlled according to the position and orientation parameters of the station's antenna.
- the communication area of the wireless communication system is formed in an environment such as a factory or warehouse where a large obstacle moves semi-statically or dynamically.
- a communication area is covered by a single or multiple base stations.
- the present invention can be applied to any wireless communication system.
- this embodiment mainly assumes a wireless communication system such as 5G, and particularly a wireless communication system using a highly straight frequency such as Above-6 GHz.
- FIG. 1 shows an example of the overall configuration of a communication system according to this embodiment.
- this communication system includes a movable base station 100-1, a movable base station 100-2, a shield sensor 10, a shield 20, a plurality of terminals 200-1 to 200-3, and a control device 300.
- the shield sensor 10 may be any sensor as long as it can detect a shield.
- the shield sensor 10 is, for example, a camera, LiDAR, or the like.
- the shield 20 may be a fixed object or a moving object. As the shielding object 20, for example, materials, machines, shelves, people, etc. in the factory are assumed.
- Each of the terminals 200-1 to 200-3 is a terminal having a function of wirelessly communicating with the mobile base station 100. Some or all of terminals 200-1 to 200-3 are specific priority terminals.
- the specific priority terminal is, for example, a monitoring camera terminal, and performs communication periodically, albeit infrequently.
- the control device 300 controls the mobile base station 100.
- the control device 300 may be placed near the mobile base station 100 or may be placed far away via a network. Also, the control device 300 may be provided in the mobile base station 100 .
- a wired connection or a wireless connection may be used between the mobile base station 100 and the control device 300 .
- the movable base station 100 is a base station that can move the movable part 105, which is a part including an antenna serving as a transmission/reception point of radio signals.
- the orientation of the antenna is also variable.
- the movable section 105 may include an antenna, and may include functional sections other than the antenna.
- the movable part 105 may be the antenna itself.
- the position of the movable section 105 can be changed in the direction indicated by reference numeral 112 by sliding the movable section 105 on the rail. You can also rotate the rail horizontally. This movement control allows the movable part 105 to be arranged at any position within a predetermined range.
- the structure supporting the movable part 105 is used to move the movable part 105 around the x-axis (see reference numeral 113), around the y-axis (see reference numeral 114), and around the z-axis (see reference numeral 115). can be rotated to This movement control allows the antenna to be oriented in any direction.
- a mobile base station 100 that slides on rails as described above is merely an example. Any method may be used as long as the position and direction of the antenna provided in the base station can be changed.
- the base station may be mounted on a drone or AGV (automated guided vehicle) to control the position and direction of the antenna of the base station, or the position and direction of the antenna of the base station may be manually controlled. .
- AGV automated guided vehicle
- FIG. 1 shows an example in which only mobile base station 100 exists as a base station
- base stations without mobile functions and mobile base stations may be used in combination.
- the position/direction parameters can be optimized in the same manner as when only the mobile base station 100 is used. It can be carried out.
- FIG. 3 shows the configuration of each device that constitutes the communication system according to this embodiment.
- FIG. 3 shows an example in which k mobile base stations 100-1 to 100-k are provided. 1 to k are described as "mobile base station 100" when they are not distinguished from each other. It is also assumed that there are a plurality of terminals 200 and each terminal 200 is a specific priority terminal.
- a shield sensing unit 400 shown in FIG. 3 corresponds to the shield sensor 10 in FIG.
- the shield sensing unit 400 may be a functional unit included in the control device 300 .
- the mobile base station 100 has an operation mechanism section 110 , a radio transmission/reception section 120 and a signal demodulation section 130 .
- the operating mechanism section 110 is a mechanism for operating the movable section 105 described above.
- the operating mechanism section 110 may be called an actuator.
- the movable section 105 may be the radio transmitting/receiving section 120 .
- the radio transmission/reception unit 120 has an antenna and transmits and receives radio signals.
- Signal demodulator 130 receives an uplink signal from radio transmitter/receiver 120 , demodulates it, and transmits it to control device 300 .
- the terminal 200 includes a wireless transmission/reception unit 210 , a position information acquisition unit 220 and an obstacle sensing unit 230 .
- the radio transmission/reception unit 210 transmits and receives radio signals.
- Positional information acquisition unit 220 acquires positional information of terminal 200 itself.
- the shield sensing unit 230 detects shields.
- the shield sensing unit 230 may be a camera, a LiDAR, or other sensors.
- location information acquiring section 220 transmits the location information to mobile base station 100 using an uplink data channel (or control channel).
- mobile base station 100 transmits the location information to control device 300 .
- the terminal 200 does not have to include the location information acquisition unit 220. In that case, control device 300 or mobile base station 100 estimates the terminal position using camera images or the like.
- Shield sensing is performed by the shield sensing unit 400 provided separately from the terminal 200. However, if the terminal 200 includes the shield sensing unit 230, the shield sensing unit 230 may notify the control device 300 of sensing information (camera image, RiDAR information, etc.) using an upstream signal. The terminal 200 may not include the shield sensing unit 230 .
- the control device 300 includes a line-of-sight determination unit 310 , an obstacle map generation unit 320 , an information acquisition unit 330 , a base station control unit 340 and a storage unit 350 .
- the outline of each part is as follows.
- the information acquisition unit 330 acquires shield sensing information, position information of the specific priority terminal 200, communication interval of the specific priority terminal, and the like.
- the shielding object map generator 320 detects the shielding object based on the shielding object sensing information, generates a 3D (or 2D) map, and stores the information in the storage unit 350 .
- the line-of-sight determination unit 310 identifies, for each movable base station, specific priority terminals that are line-of-sight for each parameter of the position and direction of the antenna of the movable base station 100, and stores this information in the storage unit 350.
- the base station control unit 340 performs movement control and the like for the movable base station 100 .
- the location information can be obtained by any method.
- the specific priority terminal 200 may report position information measured using triangulation, GPS, or the like to the control device 300 via a data channel or a control channel.
- a scenario for the location of the specific priority terminal 200 may be prepared, and location information according to the scenario (eg, location at each time) may be stored in the storage unit 350 in advance.
- the information acquisition unit 330 acquires the shield sensing information (camera image information, LiDAR information, etc.) obtained by the shield sensing unit 400 and stores it in the storage unit 350 .
- the shielding object map generation unit 320 detects a shielding object and generates a 3D (or 2D map) based on the shielding object sensing information (camera image information, LiDAR information, etc.) acquired in S102.
- the 3D map contains three-dimensional positional information of the shielding objects.
- the 2D map contains two-dimensional positional information of the occluder.
- ⁇ S104 Obtain communication interval>
- the information acquisition unit 330 acquires the communication interval of each specific priority terminal 200 .
- the communication interval may be obtained by any method. For example, if the communication interval is predetermined, the information may be input, the communication history may be predicted using machine learning, or the communication interval may be reported from the specific priority terminal 200. good.
- the visibility determination unit 310 uses the location information of the specific priority terminal 200 and the shield map for each mobile base station 100 to determine the mobile base station 100 for each combination of parameters indicating the position and direction of the antenna of the mobile base station 100 .
- the presence/absence of line-of-sight from the base station 100 to each specific priority terminal 200 is determined, and information on the determined line-of-sight presence/absence is stored in the storage unit 350 .
- a specific example of the visibility determination method will be described later.
- one mobile base station 100 has two specific priority terminals 200-1 and 200-2, and that there are parameters 1 to n indicating the position and direction of the antenna.
- One parameter m for example, consists of ⁇ xm , ym , zm , pm , cm , rm ⁇ .
- x m , y m , and z m are the x, y, and z coordinates of the center position of the antenna, respectively
- p m , cm , and r m are the pan, tilt, and roll angles of the antenna, respectively.
- the line-of-sight determination unit 310 determines whether there is line-of-sight from the mobile base station 100 to the specific priority terminals 200-1 and 200-2 for each parameter, and stores the following information in the storage unit 350, for example.
- the above information is stored in the storage unit 350 for each mobile base station 100.
- the information acquisition unit 330 constantly collects the communication history of each specific priority terminal 200 and stores it in the storage unit 350 .
- the base station control unit 340 determines whether or not communication has been performed during the period from the time preceding the current time by the time length of the communication interval acquired in S104 to the current time (the communication history is presence or absence). Note that the above period does not have to be equal to the time length of the communication interval, and may be a value based on the time length of the communication interval. For example, the above period may be a period equal to or greater than the time length of the communication interval.
- the base station control unit 340 When the base station control unit 340 detects that a specific priority terminal 200 has not communicated during the above period, the base station control unit 340 transmits the antenna position/direction parameter #k to the movable base station 100 so that the specific priority terminal 200 is in line of sight. By transmitting, the position/direction of the antenna of the mobile base station 100 is moved to the position/direction indicated by the antenna position/direction parameter #k.
- the base station control unit 340 assumes that each of the multiple parameters is applied to the communication in the specific priority terminal 200. Estimate the quality (eg, throughput) and select the parameters that give the best communication quality.
- the above movement control is performed for each mobile base station 100 . This is because it is preferable from the viewpoint of communication quality and stability to be in a line-of-sight state from a plurality of mobile base stations 100 .
- control device 300 When control device 300 detects that the state of (a) has continued for more than the communication interval of specific priority terminal 200-2, as shown in (b), control device 300 causes specific priority terminal 200-2 to The position and direction of the movable part (antenna) of mobile base station 100-1 is controlled so that the mobile base station 100-1 is in line of sight.
- Line-of-sight determination method 1 the line-of-sight determination unit 310 defines the line-of-sight area as an area through which a line segment extends from the point at the center of the antenna until it collides with a wall or a shield. With this method, if the specific priority terminal 200 is included in the area, it can be determined that the specific priority terminal 200 is in line of sight.
- the line-of-sight area can be easily calculated using only the shape of the area, the position of the shield, and the shape of the shield, regardless of the terminal position.
- Line-of-sight determination method 2 the line-of-sight determination unit 2 calculates the Fresnel zone for each point on a predetermined grid from the antenna center position, and x% of the Fresnel zone is unshielded. are line-of-sight positions, and the area around these grids is the line-of-sight area. With this method, if the specific priority terminal 200 is included in the area, it can be determined that the specific priority terminal 200 is in line of sight.
- the line-of-sight area can be calculated based only on the shape of the area, the position of the shield, and the shape of the shield, regardless of the terminal position.
- the line-of-sight determination unit 310 calculates the Fresnel zone for each terminal from the point of the antenna center position, and determines that a terminal in which a predetermined x% of the Fresnel zone is not shielded is a terminal in line-of-sight state. It is determined that
- the line-of-sight position of the terminal that actually communicates can be determined from the area shape, the shielding object position, and the shielding object shape.
- Control device 300 in the present embodiment can be realized, for example, by causing a computer to execute a program describing the processing details described in the present embodiment. Note that this "computer” may be a physical machine or a virtual machine on the cloud. When using a virtual machine, the "hardware” described here is virtual hardware.
- the above program can be recorded on a computer-readable recording medium (portable memory, etc.), saved, or distributed. It is also possible to provide the above program through a network such as the Internet or e-mail.
- FIG. 6 is a diagram showing a hardware configuration example of the computer.
- the computer of FIG. 6 has a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, and the like, which are connected to each other via a bus B, respectively.
- a program that implements the processing in the computer is provided by a recording medium 1001 such as a CD-ROM or memory card, for example.
- a recording medium 1001 such as a CD-ROM or memory card
- the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000 .
- the program does not necessarily need to be installed from the recording medium 1001, and may be downloaded from another computer via the network.
- the auxiliary storage device 1002 stores installed programs, as well as necessary files and data.
- the memory device 1003 reads and stores the program from the auxiliary storage device 1002 when a program activation instruction is received.
- the CPU 1004 implements functions related to the control device 300 according to programs stored in the memory device 1003 .
- the interface device 1005 is used as an interface for connecting to the network.
- a display device 1006 displays a GUI (Graphical User Interface) or the like by a program.
- An input device 1007 is composed of a keyboard, a mouse, buttons, a touch panel, or the like, and is used to input various operational instructions.
- the output device 1008 outputs the calculation result.
- the parameters of the position and direction of the antenna of the mobile base station are controlled based on the communication interval related to the regular communication of the specific priority terminal. , the regular communication of the specific priority terminal can be maintained, and the communication reliability can be improved.
- a control device in a communication system comprising a control device and a mobile base station, an information acquisition unit that acquires the location information of the specific priority terminal and the shield sensing information; a shield map generation unit that generates a shield map based on the shield sensing information; a line-of-sight determination unit that determines whether or not there is line-of-sight from the antenna of the mobile base station to the specific priority terminal based on the location information and the shield map; a base station control unit that controls the mobile base station so that the specific priority terminal is in a line-of-sight position from the antenna when communication by the specific priority terminal is not detected for a predetermined period of time.
- (Section 2) The control device according to claim 1, wherein the specific priority terminal is a terminal that periodically communicates at predetermined communication time intervals, and the predetermined time is based on the communication time interval.
- the line-of-sight determination unit determines whether or not there is a line-of-sight from the antenna to the specific priority terminal for each parameter indicating the position and direction of the antenna of the movable base station, and stores the determination result in a storage unit; 3.
- the base station control unit controls the movable base station using a parameter that indicates a line-of-sight position of the specific priority terminal from the antenna.
- (Section 4) A communication system comprising the control device according to any one of items 1 to 3 and the mobile base station.
- (Section 5) A control method executed by a control device in a communication system comprising a control device and a mobile base station, an information acquisition step of acquiring location information of a specific priority terminal and shield sensing information; a shield map generation step of generating a shield map based on the shield sensing information; a line-of-sight determination step of determining whether or not there is line-of-sight from the antenna of the mobile base station to the specific priority terminal based on the location information and the shield map; a base station control step of controlling the mobile base station so that the specific priority terminal is in line of sight from the antenna when communication by the specific priority terminal is not detected for a predetermined period of time.
- (Section 6) A program for causing a computer to function as each unit in the control device according to any one of items 1 to 3.
- Shield sensor 20 Shield 100 Movable base station 105 Movable unit 110 Operation mechanism unit 120 Radio transmitter/receiver 130 Signal demodulator 200 Terminal 210 Radio transmitter/receiver 2 220 position information acquisition unit 230 shield sensing 300 control device 310 line of sight determination unit 320 shield map generation unit 330 information acquisition unit 340 base station control unit 350 storage unit 400 shield sensing unit 1000 drive device 1001 recording medium 1002 auxiliary storage device 1003 Memory device 1004 CPU 1005 interface device 1006 display device 1007 input device 1008 output device
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Abstract
Description
特定優先端末の位置情報、及び遮蔽物センシング情報を取得する情報取得部と、
前記遮蔽物センシング情報に基づいて遮蔽物マップを生成する遮蔽物マップ生成部と、
前記位置情報と前記遮蔽物マップに基づいて、前記特定優先端末に対する前記可動基地局のアンテナからの見通しの有無を判定する見通し判定部と、
前記特定優先端末による通信が所定時間の間において検知されなかった場合に、前記特定優先端末が前記アンテナからの見通し位置となるように前記可動基地局を制御する基地局制御部と
を備える制御装置が提供される。
本実施の形態では、主に5G等の通信システム向けかつ特定優先端末の低頻度の高信頼な定期通信が求められるユースケース向けに、遮蔽物の多い工場屋内等における特定優先端末の定期通信を維持するための技術について説明する。
本実施の形態では、工場屋内や倉庫内など、準静的または動的に大きな遮蔽物が移動するような環境で無線通信システムの通信エリアを形成する状況を想定している。通信エリアは、単一又は複数の基地局によりカバーされる。
図3に、本実施の形態における通信システムを構成する各装置の構成を示す。図3は、k台の可動基地局100-1~100-kを備える場合の例である。1~kを特に区別しない場合には「可動基地局100」と記述する。また、複数の端末200が存在し、各端末200は特定優先端末であるとする。図3に示す遮蔽物センシング部400は、図1における遮蔽物センサ10に相当する。遮蔽物センシング部400は、制御装置300内に含まれる機能部であってもよい。
図3に示すとおり、可動基地局100は、動作機構部110、無線送受信部120、信号復調部130を有する。動作機構部110は、前述した可動部105を動作させるための機構である。動作機構部110をアクチュエータと呼んでもよい。可動部105が無線送受信部120であってもよい。
端末200は、無線送受信部210、位置情報取得部220、遮蔽物センシング230を備える。無線送受信部210は、無線信号の送受信を行う。位置情報取得部220は、端末200自身の位置情報を取得する。遮蔽物センシング部230は遮蔽物の探知を行う。遮蔽物センシング部230は、カメラでもよいし、LiDARでもよいし、その他のセンサであってもよい。
制御装置300は、見通し判定部310、遮蔽物マップ生成部320、情報取得部330、基地局制御部340、記憶部350を備える。各部の概要は下記のとおりである。
次に、図4に示すフローチャートを参照して、通信システム(特に制御装置300)の動作例を説明する。
まず、S101において、制御装置300の情報取得部330が、特定優先端末200の位置情報を取得する。特定優先端末200が複数台存在する場合には特定優先端末200毎にその位置情報を取得する。
S102において、情報取得部330は、遮蔽物センシング部400により得られた遮蔽物センシング情報(カメラ映像情報、LiDAR情報等)を取得し、記憶部350に格納する。
S103において、遮蔽物マップ生成部320は、S102において取得した遮蔽物センシング情報(カメラ映像情報、LiDAR情報等)に基づいて、遮蔽物を探知して3D(または2Dマップ)を生成する。3Dマップには、遮蔽物の3次元の位置情報が含まれる。2Dマップには遮蔽物の2次元の位置情報が含まれる。
S104において、情報取得部330は、各特定優先端末200の通信間隔を取得する。通信間隔はどのような方法で取得してもよい。例えば、通信間隔が予め決められているのであればその情報を入力してもよいし、通信履歴から機械学習を用いて予測してもよいし、特定優先端末200から通信間隔を報告してもよい。
S105において、見通し判定部310は、各可動基地局100について、特定優先端末200の位置情報及び遮蔽物マップを用いて、可動基地局100のアンテナの位置・方向を示すパラメータの組み合わせごとの、可動基地局100から各特定優先端末200への見通し有無を判別し、判別した見通し有無の情報を記憶部350に記憶する。見通し判定方法の具体例については後述する。
情報取得部330は、特定優先端末200毎の通信履歴を常時収集し、記憶部350に記憶している。
以下、見通し判定部310が実行する見通し判定方法の例を説明する。ここでは、下記の3つの例を説明する。なお、下記の3方法は例であり、下記の3方法以外の方法で見通し判定を行ってもよい。
見通し判定方法1において、見通し判定部310は、アンテナ中心位置の点から壁または遮蔽物に衝突するまでの線分が通る領域を見通しエリアとする。この方法では、特定優先端末200が当該領域に含まれていれば当該特定優先端末200は見通し状態にあると判定できる。
見通し判定方法2では、見通し判定部2は、アンテナ中心位置の点から、予め定めたグリッド上の各点に対して、フレネルゾーンを算出し、フレネルゾーンのうち予め定めたx%が遮蔽されないポイントを見通し位置とし、これらのグリッド周囲のエリアを見通しエリアとする。この方法では、特定優先端末200が当該エリアに含まれていれば当該特定優先端末200は見通し状態にあると判定できる。
見通し判定方法3において、見通し判定部310は、アンテナ中心位置の点から、各端末に対して、フレネルゾーンを算出し、フレネルゾーンのうち予め定めたx%が遮蔽されない端末を見通し状態にある端末であると判定する。
上記の見通し判定方法2,3において用いるフレネルゾーンの計算は下記の式により行うことができる。
回転楕円体の中央部の半径(フレネル半径):r1(m)
送信側と回転楕円体中央までの距離:d1(m)
受信側と回転楕円体中央までの距離:d2(m)
フレネル半径部分で反射する反射波と直接波の経路差:d3(m)
波長:λ(m)
(ハードウェア構成例)
本実施の形態における制御装置300は、例えば、コンピュータに、本実施の形態で説明する処理内容を記述したプログラムを実行させることにより実現可能である。なお、この「コンピュータ」は、物理マシンであってもよいし、クラウド上の仮想マシンであってもよい。仮想マシンを使用する場合、ここで説明する「ハードウェア」は仮想的なハードウェアである。
本実施の形態に係る技術により、特定優先端末の定期通信に係る通信間隔に基づいて、可動基地局のアンテナの位置・方向のパラメータを制御することとしたので、移動する遮蔽物がある環境でも、特定優先端末の定期通信を維持することができ、通信信頼性を向上させることができる。
本明細書には、少なくとも下記各項の制御装置、通信システム、制御方法、及びプログラムが開示されている。
(第1項)
制御装置と可動基地局とを備える通信システムにおける前記制御装置であって、
特定優先端末の位置情報、及び遮蔽物センシング情報を取得する情報取得部と、
前記遮蔽物センシング情報に基づいて遮蔽物マップを生成する遮蔽物マップ生成部と、
前記位置情報と前記遮蔽物マップに基づいて、前記特定優先端末に対する前記可動基地局のアンテナからの見通しの有無を判定する見通し判定部と、
前記特定優先端末による通信が所定時間の間において検知されなかった場合に、前記特定優先端末が前記アンテナからの見通し位置となるように前記可動基地局を制御する基地局制御部と
を備える制御装置。
(第2項)
前記特定優先端末は所定の通信時間間隔で定期的に通信を行う端末であり、前記所定時間は、当該通信時間間隔に基づく時間である
第1項に記載の制御装置。
(第3項)
前記見通し判定部は、前記可動基地局のアンテナの位置及び方向を示すパラメータ毎に、前記特定優先端末に対する前記アンテナからの見通しの有無を判定し、判定結果を記憶部に記憶し、
前記基地局制御部は、前記特定優先端末が前記アンテナからの見通し位置となるパラメータを用いて前記可動基地局を制御する
第1項又は第2項に記載の制御装置。
(第4項)
第1項ないし第3項のうちいずれか1項に記載の前記制御装置と前記可動基地局とを備える通信システム。
(第5項)
制御装置と可動基地局とを備える通信システムにおける前記制御装置が実行する制御方法であって、
特定優先端末の位置情報、及び遮蔽物センシング情報を取得する情報取得ステップと、
前記遮蔽物センシング情報に基づいて遮蔽物マップを生成する遮蔽物マップ生成ステップと、
前記位置情報と前記遮蔽物マップに基づいて、前記特定優先端末に対する前記可動基地局のアンテナからの見通しの有無を判定する見通し判定ステップと、
前記特定優先端末による通信が所定時間の間において検知されなかった場合に、前記特定優先端末が前記アンテナからの見通し位置となるように前記可動基地局を制御する基地局制御ステップと
を備える制御方法。
(第6項)
コンピュータを、第1項ないし第3項のうちいずれか1項に記載の前記制御装置における各部として機能させるためのプログラム。
20 遮蔽物
100 可動基地局
105 可動部
110 動作機構部
120 無線送受信部
130 信号復調部
200 端末
210 無線送受信部2
220 位置情報取得部
230 遮蔽物センシング
300 制御装置
310 見通し判定部
320 遮蔽物マップ生成部
330 情報取得部
340 基地局制御部
350 記憶部
400 遮蔽物センシング部
1000 ドライブ装置
1001 記録媒体
1002 補助記憶装置
1003 メモリ装置
1004 CPU
1005 インタフェース装置
1006 表示装置
1007 入力装置
1008 出力装置
Claims (6)
- 制御装置と可動基地局とを備える通信システムにおける前記制御装置であって、
特定優先端末の位置情報、及び遮蔽物センシング情報を取得する情報取得部と、
前記遮蔽物センシング情報に基づいて遮蔽物マップを生成する遮蔽物マップ生成部と、
前記位置情報と前記遮蔽物マップに基づいて、前記特定優先端末に対する前記可動基地局のアンテナからの見通しの有無を判定する見通し判定部と、
前記特定優先端末による通信が所定時間の間において検知されなかった場合に、前記特定優先端末が前記アンテナからの見通し位置となるように前記可動基地局を制御する基地局制御部と
を備える制御装置。 - 前記特定優先端末は所定の通信時間間隔で定期的に通信を行う端末であり、前記所定時間は、当該通信時間間隔に基づく時間である
請求項1に記載の制御装置。 - 前記見通し判定部は、前記可動基地局のアンテナの位置及び方向を示すパラメータ毎に、前記特定優先端末に対する前記アンテナからの見通しの有無を判定し、判定結果を記憶部に記憶し、
前記基地局制御部は、前記特定優先端末が前記アンテナからの見通し位置となるパラメータを用いて前記可動基地局を制御する
請求項1又は2に記載の制御装置。 - 請求項1ないし3のうちいずれか1項に記載の前記制御装置と前記可動基地局とを備える通信システム。
- 制御装置と可動基地局とを備える通信システムにおける前記制御装置が実行する制御方法であって、
特定優先端末の位置情報、及び遮蔽物センシング情報を取得する情報取得ステップと、
前記遮蔽物センシング情報に基づいて遮蔽物マップを生成する遮蔽物マップ生成ステップと、
前記位置情報と前記遮蔽物マップに基づいて、前記特定優先端末に対する前記可動基地局のアンテナからの見通しの有無を判定する見通し判定ステップと、
前記特定優先端末による通信が所定時間の間において検知されなかった場合に、前記特定優先端末が前記アンテナからの見通し位置となるように前記可動基地局を制御する基地局制御ステップと
を備える制御方法。 - コンピュータを、請求項1ないし3のうちいずれか1項に記載の前記制御装置における各部として機能させるためのプログラム。
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