Determination device, determination method, mobile terminal, control method, position notification system, and position notification method

Abstract

One aspect of the present invention pertains to a determination device that determines the installation position of an illumination device that comprises a transmission function whereby information is sent by changing the output state of light. The determination device comprises: a position information acquisition unit that acquires position information that indicates a position at which the illumination device can be installed and indicates an illumination target area which is illuminated by light if the illumination device is installed at the position; an adjacency information acquisition unit that, on the basis of the position information acquired by the position information acquisition unit, acquires adjacency information indicating adjacency relationships for the illumination target area; and a determination unit that, on the basis of the adjacency information obtained by the adjacency information acquisition unit, determines the installation position for the illumination device such that a non-illumination target area is not adjacent, said non-illumination target area being an area that is not illuminated by light that has a changing output state, as a result of the illumination device not being installed.

Description

[Technical field]

[0001] The present invention relates to techniques for a determination device, a determination method, a mobile terminal, a control method, a position notification system, and a position notification method. [Background technology]

[0002] With the development of outdoor position estimation technology using GPS (Global Positioning System), we can know our own position outdoors. There is also a demand for a system that notifies the position to grasp the position indoors. Technologies used in the system that notifies the position include a technology using geomagnetism, a technology using Wi-Fi (registered trademark), and a technology using visible light (for example, see Non-Patent Document 1).

[0003] In technology using visible light, dedicated lighting equipment is installed on the ceiling. This dedicated lighting equipment is an LED light equipped with a driver circuit for modulating the ID, and is therefore more expensive than normal LED lighting. The dedicated lighting equipment can transmit identification information such as ID information through changes in light and color. The mobile device can obtain the identification information from the intensity information of the received light. Since the position of the dedicated lighting equipment is associated with the identification information, the position of the mobile device can be estimated. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] "Indoor positioning system" using visible light communication, Internet (URL: https: / / www.signify.com / ja-jp / our-company / news / press-release-archive / 2017 / 20170221-philips-lighting-introduces-advanced-connected-lighting-solutions) Summary of the Invention [Problem to be solved by the invention]

[0005] Visible light technology requires the use of dedicated lighting equipment throughout the building, which increases the cost of the lighting equipment. Therefore, with conventional technology, it was difficult to economically build a system that notifies the location of the location.

[0006] In view of the above circumstances, an object of the present invention is to provide a technique that enables a system for notifying a position to be constructed economically. [Means for solving the problem]

[0007] One aspect of the present invention is a decision device for deciding an installation position of a lighting device having a transmission function for transmitting information based on a change in an output mode of light, the decision device comprising: a position information acquisition unit that acquires position information indicating a position where a lighting device can be installed and an irradiation target area to be irradiated with light when the lighting device is installed at the position; an adjacent information acquisition unit that acquires adjacent information indicating an adjacency relationship between the irradiation target areas based on the position information acquired by the position information acquisition unit; and a decision unit that decides the installation position of the lighting device based on the adjacent information acquired by the adjacent information acquisition unit such that a non-irradiation target area is not adjacent to the irradiation target area to which light whose output mode changes when the lighting device is not installed.

[0008] One aspect of the present invention is a method for determining an installation position of a lighting device having a transmission function for transmitting information based on a change in an output mode of light, the method comprising: a position information acquisition step of acquiring position information indicating a position where a lighting device can be installed and an irradiation target area to be irradiated with light when the lighting device is installed at the position; an adjacent information acquisition step of acquiring adjacent information indicating an adjacency relationship between the irradiation target areas based on the position information acquired by the position information acquisition step; and a determination step of determining the installation position of the lighting device based on the adjacent information acquired by the adjacent information acquisition step such that a non-irradiation target area is not adjacent to the irradiation target area to which light whose output mode changes when the lighting device is not installed.

[0009] One aspect of the present invention is a mobile terminal including a detection unit that detects a movement direction of the mobile terminal; a determination unit that determines whether or not it is possible to acquire location identification information transmitted from a lighting device due to a change in the light output mode; a movement direction acquisition unit that acquires the movement direction detected by the detection unit when the determination unit determines that the location identification information is not acquireable; and a position derivation unit that derives a position of the mobile terminal based on the location identification information acquired before the determination unit determines that the location identification information is not acquireable and the movement direction acquired by the movement direction acquisition unit.

[0010] One aspect of the present invention is a control method for a mobile terminal, the control method including: a detection step of detecting a movement direction of the mobile terminal; a determination step of determining whether or not it is possible to acquire location identification information transmitted from a lighting device due to a change in a light output mode; a movement direction acquisition step of acquiring the movement direction detected by the detection step when it is determined by the determination step that the location identification information is not acquireable; and a position derivation step of deriving a position of the mobile terminal based on the location identification information acquired before it is determined by the determination step that the location identification information is not acquireable and the movement direction acquired by the movement direction acquisition step.

[0011] One aspect of the present invention is a location notification system including a mobile terminal and a server, wherein the mobile terminal includes a detection unit that detects a movement direction of the mobile terminal, a determination unit that determines whether or not it is possible to acquire location identification information transmitted from a lighting device due to a change in a light output mode, and a movement direction acquisition unit that acquires the movement direction detected by the detection unit when the determination unit determines that the location identification information is not acquireable, and the server includes a location derivation unit that derives a location of the mobile terminal based on the location identification information acquired before the determination unit determines that the location identification information is not acquireable and the movement direction acquired by the movement direction acquisition unit.

[0012] One aspect of the present invention is a location notification method in a location notification system including a mobile terminal and a server, the location notification method comprising: a detection step in which the mobile terminal detects a moving direction of the mobile terminal; a determination step in which the mobile terminal determines whether or not it is possible to acquire location specification information transmitted from a lighting device due to a change in a light output mode; a movement direction acquisition step in which, if it is determined in the determination step that the location specification information is not possible to be acquired, the mobile terminal acquires the moving direction detected in the detection step; and a location derivation step in which the server derives the position of the mobile terminal based on the location specification information acquired before it was determined in the determination step that the location specification information is not possible to be acquired and the moving direction acquired in the movement direction acquisition step. Effect of the Invention

[0013] According to the present invention, a system for notifying a position can be constructed economically. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a position notification system. [Diagram 2] FIG. 2 is a functional block diagram showing a functional configuration of a determination device 100. [Diagram 3] FIG. 11 is a diagram showing a specific example of an area ID database. [Figure 4] 13 is a flowchart showing a process flow of the determination device 100. [Diagram 5] FIG. 4 is a diagram showing an example of an irradiation target region. [Figure 6] FIG. 13 is a diagram showing an area with ID and an area without ID. [Figure 7] FIG. 2 is a functional block diagram showing the functional configuration of a mobile terminal 40. [Figure 8] FIG. 11 is a diagram showing a specific example of an area ID database. [Figure 9] FIG. 13 is a diagram showing a specific example of a direction database. [Figure 10] 13 is a flowchart showing a process flow of the mobile terminal 40. [Figure 11] FIG. 11 is a sequence diagram showing a process in the position notification system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, a determination phase in which the installation positions of lighting devices are determined and a derivation phase in which a mobile terminal derives the positions of the installed lighting devices will be described.

[0016] <Decision Phase> 1 is a diagram showing an example of the configuration of a system for notifying a position (hereinafter referred to as a "position notification system"). The position notification system 1 includes a plurality of lighting devices 20-1, 20-2, 20-3, and 20-4 on a ceiling 10. In the following description, when there is no need to distinguish between the lighting devices 20-1, 20-2, 20-3, and 20-4, they will be referred to as lighting devices 20.

[0017] The lighting device 20 is an LED light, and irradiates light toward the floor surface 30. The lighting device 20 can transmit a signal to the mobile terminal 40 by a change in the light output mode (blinking pattern in this embodiment) corresponding to identification information (hereinafter referred to as "ID"). An ID is uniquely assigned to an area to be irradiated, and the lighting device 20 transmits a signal to the mobile terminal 40 by a blinking pattern indicating this ID. Therefore, when the ID is acquired, the area to be irradiated is identified from the ID, and it is possible to know that the position of the mobile terminal 40 is somewhere within the area to be irradiated.

[0018] When a lighting device 20 is installed, the mobile terminal 40 can obtain an ID in an irradiation target area where light from the lighting device 20 is irradiated. On the other hand, the mobile terminal 40 cannot obtain an ID in an irradiation target area where light is not irradiated because a lighting device 20 is not installed. An irradiation target area where light from a lighting device 20 is irradiated is referred to as an ID-present area as shown in FIG. 1. An irradiation target area where a lighting device 20 is not installed and light having ID information is not irradiated is referred to as an ID-less area. Note that the ID-less area merely indicates that light having ID information is not irradiated, and an ID is assigned to the irradiation target area.

[0019] In the case of Fig. 1, no lighting devices 20 are installed at the installation positions 50-1 and 50-2. As a result, two ID-less areas are shown. In this embodiment, as shown in Fig. 1, the installation positions of the lighting devices 20 are determined so that the ID-less areas are not adjacent to each other. A determination device for determining the installation positions will be described.

[0020] 2 is a functional block diagram showing a functional configuration of the determination device 100. The determination device 100 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like, which are connected via a bus, and functions as a device including a control unit 120 and an area ID storage unit 141 by executing a control program.

[0021] All or part of the functions of the control unit 120 and the area ID storage unit 141 may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array). The control program may be recorded on a computer-readable recording medium. Examples of computer-readable recording media include portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and semiconductor storage devices (e.g., SSDs: Solid State Drives), and storage devices such as hard disks built into computer systems. The control program may be transmitted via an electric communication line.

[0022] The area ID storage unit 141 is configured using a storage device such as a semiconductor storage device or a magnetic hard disk device. The area ID storage unit 141 stores an area ID database. FIG. 3 is a diagram showing a specific example of an area ID database in the case where a maximum of N lighting devices 20 can be installed. The area ID database is configured with an ID, an area name, a position, a radius, and compatibility information. As described above, the ID is uniquely assigned to each irradiation target area. The area name is the name of the irradiation target area. In the case of FIG. 3, the area name is the ID added after "area".

[0023] The position indicates the coordinates of the installation position when the ceiling 10 is regarded as an XY plane. The floor surface 30 is also regarded as an XY plane, and the coordinates where a perpendicular line drawn from the coordinates of the installation position to the floor surface 30 intersects with the floor surface 30 have the same XY components as the coordinates of the ceiling 10. The radius is the radius of a circle centered on the coordinates, and this circle indicates the irradiation target area. The position and radius in the area ID storage unit 141 are an example of position information.

[0024] The suitability information is information indicating whether or not it is suitable for installing a lighting device. "Suitable" indicates that it is suitable, and "unsuitable" indicates that it is not suitable. Note that "not suitable" for installing a lighting device indicates that it is possible to install the lighting device 20, but that the installation location is not very preferable in terms of operation, such as when, for example, fixtures are installed in the irradiation target area, or when the irradiation target area is far from the entrance and it is difficult to confirm whether the mobile terminal 40 can obtain the location. Note that the suitability may be indicated in stages. For example, five levels of suitability may be set, with the higher the level, the less suitable the installation location, and the less suitable the installation location is, so that the lighting device is not installed.

[0025] Returning to the explanation of Fig. 2, the control unit 120 in Fig. 2 controls the operation of each unit of the determination device 100. The control unit 120 is executed by a device including a processor such as a CPU and a RAM. The control unit 120 functions as a position information acquisition unit 121, an adjacent information acquisition unit 122, and a determination unit 123 by executing a control program.

[0026] The position information acquisition unit 121 acquires, from the area ID storage unit 141, position information indicating a position where the lighting device 20 can be installed and an irradiation target area to be irradiated with light when the lighting device 20 is installed in the position. The adjacent information acquisition unit 122 acquires adjacent information indicating an adjacent relationship between the irradiation target areas based on the position information. The determination unit 123 determines the installation position of the lighting device 20 based on the adjacent information so that irradiation target areas to which light is not irradiated due to the lighting device 20 not being installed are not adjacent to each other.

[0027] An example of the above-mentioned adjacent information acquisition unit 122 determining whether two irradiation target areas A and B are adjacent will be described. Based on Fig. 3, the adjacent information acquisition unit 122 first acquires the distance between the position of A and the position of B. If the distance is equal to or less than the sum of the radius of A and the radius of B, the adjacent information acquisition unit 122 determines that the irradiation target areas A and B are adjacent, and if the distance is greater than the sum of the radius of A and the radius of B, the adjacent information acquisition unit 122 determines that the irradiation target areas A and B are not adjacent.

[0028] The adjacent information acquisition unit 122 acquires adjacent information as, for example, a two-dimensional array N[i][j]. Here, i and j (i < j) indicate IDs. When the irradiation target areas with IDs i and j are adjacent, N[i][j] = 1; when they are not adjacent, N[i][j] = 0.

[0029] FIG. 4 is a flowchart showing the processing flow of the determination device 100. The position information acquisition unit 121 acquires position information (step S101). The adjacent information acquisition unit 122 acquires adjacent information. The determination unit 123 initializes k to 2 (step S103). This k indicates the number of ID-free areas. When k = 1, an ID-free area can surely be installed. Therefore, the determination unit 123 first starts searching in the case of the smallest two to determine whether the installation positions can be determined so as not to be adjacent.

[0030] The determination unit 123 searches for installation positions where k ID-free areas are not adjacent (step S104). The determination unit 123 determines whether the search was successful (step S105). Here, if even one search was successful, an affirmative determination is made. If the search was successful (step S105: YES), the determination unit 123 increments k by 1 (step S106) and performs the search again in step S104. That is, the determination unit 123 increases the number of ID-free areas by one and searches for non-adjacent installation positions.

[0031] If the search was not successful (step S105: NO), the determination unit 123 searches for an installation position based on the conformity information among the installation positions where k - 1 ID-free areas are not adjacent (step S107). That is, the determination unit 123 searches for an installation position where the number of irradiation target areas for which the conformity information is "non-conforming" and which become ID-free areas is maximized.

[0032] The determination unit 123 determines the installation position of the lighting device 20 as the installation position where the number of irradiation target areas for which the conformity information is "non-conforming" and which become ID-free areas is the largest (step S108), and ends the processing.

[0033] In this way, by determining the installation location that maximizes the number of ID-free areas, the number of lighting devices 20 can be reduced, making it possible to economically build a system that notifies the location. Furthermore, the compatibility information can reduce the number of illumination target areas that have fixtures or the like, or illumination target areas where it is difficult to confirm whether the mobile terminal 40 can obtain the location, and the like, so that the installation costs can be reduced and suitable operation can be achieved.

[0034] <Derivation phase> Next, a description will be given of a derivation phase in which the mobile terminal 40 derives its own position using the lighting devices 20 installed at the installation positions determined in the determination phase. It is assumed that the mobile terminal 40 is a smartphone.

[0035] 5 is a diagram showing an example of an irradiation target area. For ease of understanding, the irradiation target area used in the description of the derivation phase is assumed to be composed of nine square irradiation target areas. The numbers attached to the squares indicate the IDs of the irradiation target areas.

[0036] Fig. 6 is a diagram showing areas with ID and areas without ID. Areas 2, 4, 6, and 8 are areas with ID, and areas 1, 3, 5, 7, and 9 are areas without ID. As shown in Fig. 6, the areas without ID are not adjacent to each other. With this in mind, the derivation phase will be explained below.

[0037] 7 is a functional block diagram showing the functional configuration of mobile terminal 40. Mobile terminal 40 includes a CPU, a memory, an auxiliary storage device, and the like, which are connected by a bus, and functions as a device including control unit 200, area storage unit 241, direction storage unit 242, light receiving unit 221, communication unit 222, display operation unit 223, and acceleration sensor 224 by executing a derivation program.

[0038] All or part of the functions of the control unit 200, the area storage unit 241, and the direction storage unit 242 may be realized using hardware such as ASIC, PLD, or FPGA. The derivation program may be recorded in a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a semiconductor storage device (e.g., SSD), or a storage device such as a hard disk built into a computer system. The derivation program may be transmitted via an electric communication line.

[0039] The area storage unit 241 is configured using a storage device such as a semiconductor storage device or a magnetic hard disk device. The area storage unit 241 stores an area database. FIG. 8 is a diagram showing a specific example of an area ID database. The area database indicates whether the irradiation target area is an area with ID or an area without ID. The area database is configured with ID and presence / absence. Presence / absence is "yes" for an area with ID and "no" for an area without ID. As shown in FIG. 6, areas 2, 4, 6, and 8 are areas with ID, and areas 1, 3, 5, and 7 are areas without ID.

[0040] The direction storage unit 242 is configured using a storage device such as a semiconductor storage device or a magnetic hard disk device. The direction storage unit 242 stores a direction database. Fig. 9 is a diagram showing a specific example of the direction database. The direction database is configured with ID-containing areas and directions of north, south, east and west.

[0041] The direction database indicates which areas exist in the north, south, east and west directions of an area with an ID. NULL indicates that no area exists. In Figure 6, north, east, west and south are defined as north going up, east going to the right, west going to the left and south going down, as shown on the map. For example, in Area 2, Area 3 exists to the east, there is no area going north, Area 1 exists to the west and Area 5 exists to the south. Therefore, in the case of Area 2, 3 is to the east, NULL is to the north, 1 is to the west and 5 is to the south.

[0042] Returning to Fig. 7, the light receiving unit 221 receives light emitted by the lighting device 20. The light receiving unit 221 is composed of, for example, a CCD sensor, an illuminance sensor, a PD (Photo Diode), etc. The communication unit 222 performs various communications using a communication line such as 4G or 5G, a wireless LAN, Bluetooth (registered trademark), etc. The display operation unit 223 is composed of a liquid crystal, an organic EL, a touch panel, a hard key, etc. The acceleration sensor 224 detects the acceleration and the moving direction when the mobile terminal 40 moves.

[0043] 7 controls the operation of each part of the mobile terminal 40. The control part 200 is executed by a device including a processor such as a CPU and a RAM. The control part 200 functions as a detection part 201, a determination part 202, a movement direction acquisition part 203, and a position derivation part 204 by executing a derivation program.

[0044] The detection unit 201 detects the moving direction of the mobile terminal 40 detected by the acceleration sensor 224. The determination unit 202 determines whether or not it is possible to acquire position specifying information transmitted by using light from the lighting device 20. The ID is an example of position specifying information.

[0045] When the determination unit 202 determines that the location specification information cannot be acquired, the movement direction acquisition unit 203 acquires the movement direction detected by the detection unit 201. Here, the movement direction before it is determined that the location specification information cannot be acquired is acquired. For example, the detection unit 201 detects the movement direction every time a predetermined time arrives, and stores the detected time and the movement direction at that time. This allows the movement direction acquisition unit 203 to acquire the previous movement direction.

[0046] The position derivation unit 204 derives the position of the mobile terminal 40 based on the position identification information acquired before the determination unit 202 determines that the position identification information cannot be acquired and the moving direction acquired by the moving direction acquisition unit. For example, if the position identification information acquired before the determination unit 202 determines that the position identification information cannot be acquired is 4 and the acquired moving direction is north, the position derivation unit 204 derives that the current position is Area 1 by using the direction database.

[0047] 10 is a flowchart showing the flow of processing of the mobile terminal 40. This flowchart is executed by an application installed in the mobile terminal 40. The user of the mobile terminal 40 starts the application when entering an area in which the position notification system 1 is constructed. In addition, in the mobile terminal 40, the detection unit 201 detects the moving direction every time a predetermined time arrives as a thread separate from the thread that executes the following flowchart, and sequentially stores the detected time and the moving direction at that time.

[0048] 10, when the light receiving unit 221 receives light (step S201), the determination unit 202 determines whether or not an ID can be acquired from the received light (step S202). If the ID can be acquired (step S202: YES), the determination unit 202 stores the ID (step S207), displays the position corresponding to the ID (step S206), and returns to step S201. In the above step S207, the ID of the currently located irradiation target area is successively updated.

[0049] If the ID cannot be acquired (step S202: NO), the movement direction acquisition unit 203 acquires the movement direction stored by the detection unit 201 (step S203). Here, the movement direction before it was determined that the ID cannot be acquired is acquired. The position derivation unit 204 acquires the ID stored in step S207. This makes it possible to acquire the ID of the irradiation target area in which the mobile terminal 40 was located before it was determined that the ID cannot be acquired. The position derivation unit 204 derives the current position of the mobile terminal 40 from the movement direction and ID using a direction database (step S205), displays the derived position on the display operation unit 223 (step S206), and returns to step S201.

[0050] In this way, even if an ID-free area is provided, the current location can be derived. This reduces the number of lighting devices 20, making it possible to economically build a system for notifying the location. Note that part of the processing may be performed by a server provided in the cloud. FIG. 11 is a sequence diagram showing the processing in a location notification system in which a server 500 is added to the location notification system 1.

[0051] In a normal sequence, when the portable terminal 40 receives light and acquires an ID, it transmits an ID notification to the server 500. The server 500 acquires the ID from the ID notification and stores the ID. The portable terminal 40 also displays the position corresponding to the acquired ID. In the normal sequence, these processes are repeated.

[0052] When it is determined that the ID cannot be acquired (step S301), the mobile terminal 40 acquires the moving direction before it was determined that the ID cannot be acquired (step S302). The mobile terminal 40 transmits an acquisition-unavailable notification to the server 500 (step S303). The acquisition-unavailable notification includes the moving direction acquired in step S302.

[0053] The server 500 derives the current position of the mobile terminal 40 using the direction database from the stored ID and the moving direction received in the non-acquisition notification (step S304). The server 500 transmits a position notification to the mobile terminal 40 (step S305). The position notification includes the derived position. The mobile terminal 40 displays the position received in the position notification on the display operation unit 223 (step S306).

[0054] In this way, the processing load on the mobile terminal 40 can be reduced compared to when the processing of the flowchart shown in FIG. 10 is executed.

[0055] In the above-described embodiment, the direction database includes only four directions, east, west, north, south, but is not limited to this. For example, if the maximum error in direction detection accuracy is 30°, even if the direction is divided into 360 / 30=12 directions, the area to which the user currently belongs can be identified by setting 30°×2n to 30°×(2n+1) as an ID-containing area and 30°×(2n+1) to 30°×(2n+2) as an ID-free area with the user's own area at the center (n is an integer equal to or greater than 0). In this way, by increasing the number of directions to be estimated, the present invention can be applied even when the shape of the area is other than a circle or a rectangle as used in the previous examples.

[0056] In this embodiment, the installation positions are determined so that the ID-less areas are not adjacent to each other, but the present invention is not limited to this. For example, the IDs may be arranged to be adjacent to each other to some extent depending on the required accuracy. For example, once the ID of the first location is stored, even if the ID cannot be obtained thereafter, the approximate location can be obtained, although not with high accuracy, based on the direction detected by the detection unit 201. Therefore, the number of ID-less areas that are permitted to be adjacent to each other may be flexibly changed depending on the required accuracy. This makes it possible to further reduce the number of lighting devices 20, making it possible to economically build a system that notifies the location.

[0057] The light emitted by the lighting device 20 is not limited to visible light, and may be near-infrared light, etc., as long as it is light that can be received by an illuminance sensor or a camera. In the above embodiment, information is transmitted using a blinking pattern, but instead, color changes or light intensity may be used.

[0058] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included. [Industrial Applicability]

[0059] The present invention is applicable to a position notification system that notifies a position indoors. [Explanation of symbols]

[0060] 10...ceiling, 20, 20-1, 20-2, 20-3, 20-4...lighting equipment, 30...floor surface, 40...mobile terminal, 50-1, 50-2...installation position, 100...determination device, 120...control unit, 121...position information acquisition unit, 122...adjacent information acquisition unit, 123...determination unit, 141...storage unit, 200...control unit, 201...detection unit, 202...determination unit, 203...movement direction acquisition unit, 204...position derivation unit, 221...light receiving unit, 222...communication unit, 223...display operation unit, 224...acceleration sensor, 241...area storage unit, 242...direction storage unit, 500...server

Claims

1. A determination device for determining an installation position of a lighting device having a transmission function for transmitting information by changing a light output mode, a position information acquiring unit that acquires position information indicating a position where a lighting device can be installed and an illumination target area to be illuminated with light when the lighting device is installed at the position; an adjacent information acquisition unit that acquires adjacent information indicating an adjacent relationship between irradiation target regions based on the position information acquired by the position information acquisition unit; a determination unit that determines installation positions of the lighting devices based on the adjacent information acquired by the adjacent information acquisition unit so that non-irradiation target areas, which are not irradiated with light whose output mode changes due to the lighting devices not being installed, are not adjacent to each other; Equipped with The determination unit determines installation positions of the lighting devices so as to maximize the number of non-illumination target areas.

2. 2. The determination device according to claim 1, wherein compatibility information indicating whether or not an installation position is suitable for installation of the lighting device is provided for each installation position, and the determination unit determines the installation positions of the lighting devices based on the adjacency information and the compatibility information such that the non-illumination target areas are not adjacent to each other due to the lighting devices not being installed.

3. A method for determining an installation location of a lighting device having a transmission function for transmitting information by changing a light output mode, comprising the steps of: a position information acquiring step of acquiring position information indicating a position where a lighting device can be installed and an illumination target area to be illuminated with light when the lighting device is installed at the position; an adjacent information acquiring step of acquiring adjacent information indicating an adjacent relationship between irradiation target regions based on the position information acquired by the position information acquiring step; a determining step of determining installation positions of the lighting devices based on the adjacent information acquired by the adjacent information acquiring step so that non-irradiation target areas, which are not irradiated with the light whose output mode changes due to the lighting devices not being installed, are not adjacent to each other; Equipped with The determining step determines installation positions of the lighting devices so as to maximize the number of non-illumination target areas.

4. A detection unit that detects a moving direction of the mobile terminal; a determination unit that determines whether or not location identification information transmitted from a lighting device based on a change in a light output mode can be acquired; a movement direction acquisition unit that acquires the movement direction detected by the detection unit when the determination unit determines that the position identification information cannot be acquired; a position deriving unit that derives a position of the portable terminal based on the position specifying information acquired before the determining unit determines that the position specifying information cannot be acquired and the moving direction acquired by the moving direction acquiring unit; Equipped with the installation position of the lighting device is determined based on adjacency information indicating an adjacency relationship of irradiation target areas to which light is irradiated when the lighting device is installed in a position where the lighting device can be installed, such that non-irradiation target areas to which light whose output state changes due to the lighting device not being installed are not adjacent to each other, and such that the number of non-irradiation target areas is maximized.

5. A method for controlling a mobile terminal, comprising: A detection step of detecting a moving direction of the mobile terminal; a determination step of determining whether or not location identification information transmitted from the lighting device based on a change in the light output mode can be acquired; a movement direction acquiring step of acquiring the movement direction detected in the detection step when it is determined in the determination step that the position specifying information cannot be acquired; a position deriving step of deriving a position of the portable terminal based on the position specifying information acquired before it is determined in the determining step that the position specifying information cannot be acquired and the moving direction acquired in the moving direction acquiring step; Equipped with the installation position of the lighting device is determined based on adjacency information indicating an adjacency relationship of irradiation target areas to which light is irradiated when the lighting device is installed in a position where the lighting device can be installed, such that non-irradiation target areas to which light whose output state changes due to the lighting device not being installed are not adjacent to each other and such that the number of non-irradiation target areas is maximized.

6. A location notification system including a mobile terminal and a server, The mobile terminal includes: A detection unit that detects a moving direction of the mobile terminal; a determination unit that determines whether or not location identification information transmitted from a lighting device based on a change in a light output mode can be acquired; a movement direction acquisition unit that acquires the movement direction detected by the detection unit when the determination unit determines that the position identification information cannot be acquired; Equipped with The server, a position deriving unit that derives a position of the mobile terminal based on the position specifying information acquired before the determining unit determines that the position specifying information cannot be acquired and the moving direction acquired by the moving direction acquiring unit; Equipped with a position notification system in which the installation position of the lighting device is determined based on adjacency information indicating an adjacency relationship of irradiation target areas to which light is irradiated when the lighting device is installed in a position where the lighting device can be installed, such that non-irradiation target areas to which light whose output state changes due to the lighting device not being installed are not adjacent to each other and such that the number of non-irradiation target areas is maximized.

7. A location notification method in a location notification system including a mobile terminal and a server, a detection step of detecting a moving direction of the mobile terminal by the mobile terminal; a determination step of determining whether the mobile terminal is capable of acquiring location identification information transmitted by a lighting device based on a change in a light output mode; a movement direction acquisition step of acquiring the movement direction detected in the detection step by the mobile terminal when it is determined in the determination step that the location specification information cannot be acquired; a position deriving step in which the server derives a position of the mobile terminal based on the position specifying information acquired before it is determined in the determining step that the position specifying information cannot be acquired and the moving direction acquired in the moving direction acquiring step; Equipped with the installation position of the lighting device is determined based on adjacency information indicating an adjacency relationship of irradiation target areas to which light is irradiated when the lighting device is installed in a position where the lighting device can be installed, such that non-irradiation target areas to which light whose output state changes due to the lighting device not being installed are not adjacent to each other and such that the number of non-irradiation target areas is maximized.

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