WO2022269841A1 - 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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- WO2022269841A1 WO2022269841A1 PCT/JP2021/023870 JP2021023870W WO2022269841A1 WO 2022269841 A1 WO2022269841 A1 WO 2022269841A1 JP 2021023870 W JP2021023870 W JP 2021023870W WO 2022269841 A1 WO2022269841 A1 WO 2022269841A1
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- 238000004891 communication Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 26
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- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229930091051 Arenine Natural products 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
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/005—Moving wireless networks
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
- terminals examples of specific priority terminals
- AGVs automated guided vehicles
- the present invention has been made in view of the above points, and it is an object of the present invention to provide a technology capable of maintaining a redundant connection state of a specific priority terminal even in an environment where a shield exists. .
- the control device in a communication system comprising a control device and a plurality of base stations, an information acquisition unit that acquires location information of one or more specific priority terminals and 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 each base station to each specific priority terminal based on the location information and the shield map;
- a control device comprising: a base station control unit that controls movable base stations among the plurality of base stations so as to maximize the number of specific priority terminals that are line-of-sight from the plurality of base stations. 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 terminal that connects a remotely controlled production robot or AGV (automated guided vehicle). Such specific priority terminals need to maintain a redundant connection state in order to maintain communication reliability. However, in a factory with many shields and moving shields, communication is interrupted, and it is difficult to maintain the redundant connection state as described above. Therefore, in this embodiment, the redundant connection state is maintained by controlling the position and direction of the antenna of the mobile base station.
- Control for maintaining the redundant connection state of the specific priority terminal is executed by the control device 300, which will be described later.
- the outline of control is as follows.
- the control device 300 Based on the shielding object detection information (generated from camera image information and LiDAR information) and the location information of the specific priority terminal, the control device 300 provides line-of-sight from multiple base stations for each combination of position and direction parameters of the antennas of the mobile base stations.
- the specific priority terminal number Np and the coverage area quality (such as the number of coverage area elements Ne that can be seen) are calculated and stored.
- control device 300 calculates the antenna position/direction parameter that maximizes the coverage area quality (such as Ne) among the combinations of the antenna position/direction parameters that maximize Np, and uses the calculated parameter to Control to move the antenna of the station 100 is executed.
- the antenna position/direction parameter that maximizes the coverage area quality such as Ne
- 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 terminal that connects a remotely controlled production robot or an AGV (Automated Guided Vehicle).
- 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 capable of moving 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, location information of the specific priority terminal 200, 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 mobile base station, specific priority terminals and coverage area elements that are line-of-sight for each parameter of the position and direction of the antenna of the mobile 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.
- the visibility determining unit 310 uses the position information of the specific priority terminal 200 and the shield map to determine the mobile 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 .
- the line-of-sight determination unit 310 uses the coverage area element information and the shield map 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 or absence of line of sight to each cover area element is determined, and information of the determined line of sight presence or absence is stored in the storage unit 350 .
- 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 that exists in multiple units.
- a coverage area element is, as shown in FIG. 5, a small area when an area (coverage area) covered by a plurality of base stations to be controlled is divided into small areas.
- one mobile base station 100 is assumed to have 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 each coverage area element 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 that exists in multiple units.
- the base station control unit 340 determines the number of specific priority terminals Np that are line-of-sight from multiple base stations and the coverage area quality ( (such as the number of cover area elements Ne, etc.) is calculated, and the calculated information is stored.
- mobile base station 100-1, mobile base station 100-2, and specific priority terminal 200-1 and specific priority terminal 200-2 exist.
- a when mobile base station 100-2 is parameter b, both mobile base station 100-1 and mobile base station 100-2 have line-of-sight to specific priority terminal 200-1, but mobile base station Assuming that only 100-1 has line-of-sight to the specific priority terminal 200-2, a plurality of movable The number of specific priority terminals Np that can be seen from the base station is one.
- the coverage area quality may be the number of coverage area elements visible from a plurality of mobile base stations, or other indicators may be the coverage area quality.
- the base station control unit 340 selects the antenna position/direction parameter #k that maximizes the coverage area quality (Ne, etc.) from among the combinations of antenna position/direction parameters that maximize Np.
- mobile base station 100-1 It is assumed that the maximum Np is 2 in both cases of "parameter c, mobile base station 100-2: parameter d" and "mobile base station 100-1: parameter e, mobile base station 100-2: parameter f".
- mobile base station 100-1 parameter c
- mobile base station 100-2 parameter d
- the base station control unit 340 selects "movable base station 100-1: parameter c, mobile base station 100-2: parameter d'.
- the base station control unit 340 may select any parameter from among the antenna position/direction parameters that maximize Np. In this case, it is not necessary to calculate the coverage area quality. .
- ⁇ S107 Base station control>
- the base station controller 340 transmits the parameters selected in S106 to each mobile base station 100, thereby moving the position and direction of the antenna of each mobile base station 100 to the position and direction according to the parameters.
- 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 and the coverage area element are included in the area, it can be determined that the specific priority terminal 200 and the coverage area element are 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 and the coverage area element are included in the area, it can be determined that the specific priority terminal 200 and the coverage area element are 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 antenna position/direction parameter #k that maximizes the coverage area quality (Ne, etc.) is selected from among the combinations of antenna position/direction parameters that maximize Np, the communication quality of the specific priority terminal is It is possible to improve the coverage area communication quality while preferentially guaranteeing it.
- a control device in a communication system comprising a control device and a plurality of base stations, an information acquisition unit that acquires location information of one or more specific priority terminals and 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 each base station to each specific priority terminal based on the location information and the shield map;
- a control device comprising: a base station control unit that controls movable base stations among the plurality of base stations so as to maximize the number of specific priority terminals that are line-of-sight from the plurality of base stations.
- the base station control unit selects one or more parameters indicating the position and direction of an antenna that maximizes the number of specific priority terminals that are line-of-sight from a plurality of base stations, and determines the area covered by the plurality of base stations. 2.
- (Section 3) 3.
- the control device according to claim 2, wherein the coverage area quality is the number of coverage area elements that are visible from the base station.
- a communication system comprising the control device according to any one of items 1 to 3 and the plurality of base stations.
- a control method executed by a control device in a communication system comprising a control device and a plurality of base stations, an information acquisition step of acquiring location information of one or more specific priority terminals 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 a line-of-sight from the antenna of each base station to each specific priority terminal based on the location information and the shield map;
- a control method comprising: a base station control step of controlling mobile base stations among the plurality of base stations so as to maximize the number of specific priority terminals that are in line of sight from the plurality of base stations.
- (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
1以上の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、各特定優先端末に対する各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、
複数基地局から見通し状態となる特定優先端末の数が最大になるように、前記複数の基地局における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通信信頼性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冗長接続状態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。説明において図5も適宜参照する。
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、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。
基地局制御部340(又は見通し判定部310)は、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、複数基地局から見通しとなる特定優先端末数Npと、カバーエリア品質(見通しとなるカバーエリア要素数Neなど)を算出し、算出した情報を記憶する。
S106において、基地局制御部340は、Npを最大にするアンテナ位置・方向パラメータの組み合わせのうち、カバーエリア品質(Ne等)を最大にするアンテナ位置・方向パラメータ#kを選択する。
S107において、基地局制御部340は、S106において選択したパラメータを各可動基地局100へ送信することにより、各可動基地局100のアンテナの位置・方向をパラメータに従った位置・方向に移動させる。
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、カバーエリア要素が当該領域に含まれていれば当該特定優先端末200、カバーエリア要素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、カバーエリア要素が当該エリアに含まれていれば当該特定優先端末200、カバーエリア要素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、出来るだけ多くの特定優先端末が複数の可動基地局から見通し位置になる可動基地局位置を選択することとしたので、特定優先端末が冗長接続状態である可能性を最大化し、予測不可能な遮蔽等による通信品質低下を回避することができる。
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)
制御装置と複数の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、
1以上の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、各特定優先端末に対する各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、
複数基地局から見通し状態となる特定優先端末の数が最大になるように、前記複数の基地局における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)
前記基地局制御部は、複数基地局から見通し状態となる特定優先端末の数が最大になるようなアンテナの位置及び方向を示す1以上のパラメータのうち、前記複数の基地局によりカバーされるエリアの品質であるカバーエリア品質を最大にするパラメータを選択し、当該パラメータを用いて可動基地局を制御する
第1項に記載の制御装置。
(第3項)
前記カバーエリア品質は、基地局から見通し状態となるカバーエリア要素の数である
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複数の基地局とを備える通信システム。
(第5項)
制御装置と複数の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、
1以上の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、各特定優先端末に対する各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、
複数基地局から見通し状態となる特定優先端末の数が最大になるように、前記複数の基地局における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)
- 制御装置と複数の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、
1以上の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、各特定優先端末に対する各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、
複数基地局から見通し状態となる特定優先端末の数が最大になるように、前記複数の基地局における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。 - 前記基地局制御部は、複数基地局から見通し状態となる特定優先端末の数が最大になるようなアンテナの位置及び方向を示す1以上のパラメータのうち、前記複数の基地局によりカバーされるエリアの品質であるカバーエリア品質を最大にするパラメータを選択し、当該パラメータを用いて可動基地局を制御する
請求項1に記載の制御装置。 - 前記カバーエリア品質は、基地局から見通し状態となるカバーエリア要素の数である
請求項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複数の基地局とを備える通信システム。
- 制御装置と複数の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、
1以上の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、各特定優先端末に対する各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、
複数基地局から見通し状態となる特定優先端末の数が最大になるように、前記複数の基地局における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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JP2004241799A (ja) * | 2003-02-03 | 2004-08-26 | Nippon Telegr & Teleph Corp <Ntt> | 無線基地局配置方法 |
JP2017098797A (ja) * | 2015-11-25 | 2017-06-01 | 日本電信電話株式会社 | 無線通信システム、集中制御局及び可動無線局制御方法 |
WO2018139397A1 (ja) * | 2017-01-26 | 2018-08-02 | 日本電気株式会社 | 無線通信装置、無線通信端末、無線通信システム、無線通信方法及び記録媒体 |
JP2019033435A (ja) * | 2017-08-09 | 2019-02-28 | 日本電信電話株式会社 | 無線通信システム、集中制御局および可動基地局配置方法 |
WO2020031280A1 (ja) * | 2018-08-07 | 2020-02-13 | 株式会社Nttドコモ | ユーザ装置及び制御方法 |
JP2020202437A (ja) * | 2019-06-06 | 2020-12-17 | 西日本電信電話株式会社 | 基地局装置、方向決定方法、及びプログラム |
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JP2004241799A (ja) * | 2003-02-03 | 2004-08-26 | Nippon Telegr & Teleph Corp <Ntt> | 無線基地局配置方法 |
JP2017098797A (ja) * | 2015-11-25 | 2017-06-01 | 日本電信電話株式会社 | 無線通信システム、集中制御局及び可動無線局制御方法 |
WO2018139397A1 (ja) * | 2017-01-26 | 2018-08-02 | 日本電気株式会社 | 無線通信装置、無線通信端末、無線通信システム、無線通信方法及び記録媒体 |
JP2019033435A (ja) * | 2017-08-09 | 2019-02-28 | 日本電信電話株式会社 | 無線通信システム、集中制御局および可動基地局配置方法 |
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JP2020202437A (ja) * | 2019-06-06 | 2020-12-17 | 西日本電信電話株式会社 | 基地局装置、方向決定方法、及びプログラム |
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