CN117121502A - Control system, control method, and program - Google Patents
Control system, control method, and program Download PDFInfo
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- CN117121502A CN117121502A CN202280027334.0A CN202280027334A CN117121502A CN 117121502 A CN117121502 A CN 117121502A CN 202280027334 A CN202280027334 A CN 202280027334A CN 117121502 A CN117121502 A CN 117121502A
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- 238000000034 method Methods 0.000 title claims description 32
- 238000004891 communication Methods 0.000 claims abstract description 448
- 230000004044 response Effects 0.000 claims description 80
- 230000008054 signal transmission Effects 0.000 claims description 9
- 230000004048 modification Effects 0.000 description 13
- 238000012986 modification Methods 0.000 description 13
- 230000010365 information processing Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Abstract
A control system (100) is provided with: a controlled device (20); and a control device (10) for controlling the controlled device (20), wherein the control device (10) determines whether communication between the control device (10) and the controlled device (20) is possible via a local communication network, and when it is determined that communication between the control device (10) and the controlled device (20) is possible via the local communication network, the control device (10) communicates with the controlled device (20) via the local communication network, and when it is determined that communication between the control device (10) and the controlled device (20) is not possible via the local communication network, the control device (10) communicates with the controlled device (20) via a wide area communication network.
Description
Technical Field
The present invention relates to a control system, a control method, and a program.
Background
In recent years, in a system that controls a plurality of devices connected to a network in a house via a cloud or a server, improvement of convenience for users has been demanded (for example, patent literature 1).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2021-057733
Disclosure of Invention
Problems to be solved by the invention
However, in the device control apparatus described in patent document 1, for example, the following may be present: when a user's communication terminal cannot be connected to a server due to an abnormality of the internet or the like, the user cannot control a plurality of devices via the cloud or the server, or cannot smoothly control the plurality of devices due to a delay in communication.
Accordingly, the present invention provides a control system, a control method, and a program capable of performing stable communication with low delay.
Solution for solving the problem
A control system according to an embodiment of the present invention includes: a controlled device; and a control device configured to control the controlled device, wherein the control device determines whether communication between the control device and the controlled device is possible via a local communication network, the control device communicates with the controlled device via the local communication network when it is determined that communication between the control device and the controlled device is possible via the local communication network, and the control device communicates with the controlled device via a wide area communication network when it is determined that communication between the control device and the controlled device is not possible via the local communication network.
A control method according to an aspect of the present invention is a control method for controlling communication between a controlled device and a control device for controlling the controlled device, the control method including: a determination step of determining whether or not communication between the control device and the controlled device is possible via a local communication network; a local communication step of, when it is determined that communication between the control device and the controlled device is possible via the local communication network, communicating with the controlled device via the local communication network; and a wide area communication step of communicating with the controlled device via a wide area communication network when it is determined that communication between the control device and the controlled device via the local communication network is impossible.
A program according to an embodiment of the present invention is a program for causing a computer to execute the control method.
ADVANTAGEOUS EFFECTS OF INVENTION
The control system, control method, and program according to one embodiment of the present invention enable stable communication with low delay.
Drawings
Fig. 1 is a block diagram showing an example of a functional configuration of a control system according to the embodiment.
Fig. 2 is a flowchart showing a first example of a switching operation of the communication network between the control device and the controlled device.
Fig. 3 is a flowchart showing a second example of a switching action of the communication network between the control device and the controlled device.
Fig. 4 is a flowchart showing an example of the detailed flow of step S202 in fig. 3.
Fig. 5 is a flowchart showing a modification 1 of the second example of the switching operation of the communication network between the control device and the controlled device.
Fig. 6 is a flowchart showing a first example of the operation of establishing a communication scheme at the time of communication via the local communication network between the control device and the controlled device.
Fig. 7 is a flowchart showing an example of a detailed flow of the operation of the control device in the case of no in step S502 in fig. 6.
Fig. 8 is a flowchart showing an example of a response operation of the controlled device in modification 1 of the first example of the communication scheme establishment operation.
Detailed Description
The embodiments will be specifically described below with reference to the drawings. The embodiments described below each show an overview or a specific example. The numerical values, shapes, materials, components, arrangement positions and connection modes of the components, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Among the constituent elements in the following embodiments, constituent elements not described in the independent claims will be described as arbitrary constituent elements.
The drawings are schematic and are not necessarily strictly illustrated. In the drawings, substantially the same components are denoted by the same reference numerals, and overlapping description may be omitted or simplified.
(embodiment)
Structure
First, the configuration of the control system according to embodiment 1 will be described. Fig. 1 is a block diagram showing an example of a functional configuration of a control system 100 according to the embodiment.
The control system 100 shown in fig. 1 is a control system capable of controlling a plurality of controlled devices 20 installed in a building such as a house, an office, or a hospital. Specifically, the control system 100 switches whether communication between the control device 10 and the controlled device 20 is performed via a local communication network (e.g., the router 40) or via a wide area communication network (e.g., the internet 50) according to whether communication between the control device 10 and the controlled device 20 is possible via the local communication network.
As shown in fig. 1, the control system 100 includes, for example, a control device 10, a controlled device 20, and a server apparatus 30.
[ control device ]
The control device 10 is a device that controls the controlled device 20. The control device 10 may be a portable computer device such as a portable terminal or a tablet terminal, or an operation terminal such as a remote controller or a control panel provided on a wall of a building.
The control device 10 includes, for example, a communication unit 11, a control unit 12, a storage unit 13, an input receiving unit 14, and a display unit 15.
The communication unit 11 is a communication module (communication circuit) for communicating the control device 10 with the controlled device 20 and the server apparatus 30. The communication unit 11 includes a first communication unit 11a and a second communication unit 11b.
The first communication section 11a is a communication module (communication circuit) for the control device 10 to communicate with the controlled device 20 via the local communication network. The communication performed by the first communication unit 11a is, for example, wireless communication, but may be wired communication. The standard used for communication is not particularly limited, and for example, in the case where the first communication unit 11a communicates via a wireless local communication network, the wireless local communication network may be Wi-Fi (registered trademark) or Bluetooth (registered trademark). For example, in the example of fig. 1, when the first communication unit 11a is bluetooth (registered trademark), communication with the control device 10 can be performed without via the router 40.
The second communication unit 11b is a communication module (communication circuit) for the control device 10 to communicate with the controlled device 20 and the server apparatus 30 via the wide area communication network. The communication performed by the second communication unit 11b is, for example, wireless communication, but may be wired communication. The standard used for communication is not particularly limited either, and for example, in the case where the second communication unit 11b communicates via a wireless wide area communication network, the wireless wide area communication network may be a mobile line network.
The control unit 12 performs information processing for controlling the operation of the control device 10. The specific operation of the control unit 12 will be described in the item [ operation ], and thus the description thereof will be omitted. The control section 12 is implemented by a microcomputer, for example, but may be implemented by a processor.
The storage unit 13 is a storage device that stores a computer program or the like executed by the control unit 12. In addition, when the control device 10 communicates with the controlled device 20 via the local communication network, the storage unit 13 may store the access point used for the communication as history information. For example, in the example of fig. 1, the storage unit 13 stores the router 40 as an access point. The storage unit 13 is implemented by, for example, a semiconductor memory or the like.
The input receiving unit 14 receives a manual input from a user. The input receiving unit 14 is implemented by a touch panel, for example, but may be implemented by a hardware button. The input receiving unit 14 may receive a voice input from a user. In this case, the input receiving unit 14 is implemented by a microphone or the like.
The display unit 15 displays characters, images, and the like for presentation to the user based on the control of the control unit 12. The display unit 15 is realized by a display panel such as a liquid crystal panel or an organic EL (Electro Luminescence: electroluminescence) panel.
In the example of fig. 1, one control device 10 is illustrated, but the control system 100 may be provided with a plurality of control devices 10.
[ controlled device ]
The controlled device 20 is a device controlled by the control device 10, and is installed in a building such as a house, an office, or a hospital, for example. The controlled device 20 may be, for example, a lighting device, an air conditioning device, a floor heating device, an electronic lock, an electric blind (electric window), an electric blind (electric blind), an air cleaner, a television, a fragrance machine, an audio device, or the like. The controlled device 20 includes a communication unit 21, a control unit 22, and a storage unit 23.
The communication unit 21 is a communication module (communication circuit) for the controlled device 20 to communicate with the control device 10 and the server apparatus 30. The communication unit 21 includes a first communication unit 21a and a second communication unit 21b.
The first communication unit 21a is a communication module (communication circuit) for the controlled device 20 to communicate with the control device 10 and the server apparatus 30 via the local communication network. The communication performed by the first communication unit 21a is, for example, wireless communication, but may be wired communication. The standard used for communication is not particularly limited, and for example, in the case where the first communication unit 21a performs communication via a wireless local communication network, the wireless local communication network may be Wi-Fi (registered trademark) or bluetooth (registered trademark). The first communication unit 21a may perform local communication with the control device 10 without encryption or with encryption according to the type of the controlled device 20 (for example, a device with high information confidentiality and a device with low information confidentiality). In this case, the control system 100 may include an external communication module attached to the controlled device 20, and the first communication unit 21a may be the external communication module. Thereby, the user can install the communication module after the outside of the housing of the controlled device 20.
The second communication unit 21b is a communication module (communication circuit) for the controlled device 20 to communicate with the control device 10 and the server apparatus 30 via the wide area communication network. The communication performed by the second communication unit 21b is, for example, wireless communication, but may be wired communication. The standard used for communication is not particularly limited, and for example, in the case where the second communication unit 21b communicates via a wireless wide area communication network, the wireless wide area communication network may be a mobile line network.
The control unit 22 performs information processing for controlling the operation of the controlled device 20. The specific operation of the control unit 22 will be described in the item [ operation ], and thus the description thereof will be omitted. The control unit 22 is implemented by a microcomputer, for example, but may be implemented by a processor or a dedicated circuit.
The storage unit 23 is a storage device that stores a computer program or the like executed by the control unit 22. The storage unit 23 may store the identification information of the control device 10 in advance. The storage unit 23 is implemented by, for example, a semiconductor memory or the like.
In the example of fig. 1, one controlled device 20 is illustrated, but the control system 100 may be provided with a plurality of controlled devices 20.
[ Server device ]
The server device 30 is a computer located outside the building. The server apparatus 30 is a server that acquires an execution input for executing control of the controlled device 20 from the control device 10, and controls the controlled device 20 via the wide area communication network based on the acquired execution input. The server device 30 includes, for example, a communication unit 31, an information processing unit 32, and a storage unit 33.
The communication unit 31 is a communication module (communication circuit) for the server apparatus 30 to communicate with the control device 10 and the controlled device 20 via a wide area communication network (for example, the internet 50). The communication performed by the communication unit 31 is, for example, wired communication, but may be wireless communication. The communication standard used for communication is not particularly limited either.
The information processing section 32 performs information processing related to control of the controlled device 20. The information processing section 32 is implemented by a microcomputer, for example, but may be implemented by a processor.
The storage unit 33 is a storage device that stores control information of the controlled device 20, a control program executed by the information processing unit 32, and the like. The storage unit 33 is implemented by, for example, an HDD (Hard Disk Drive), but may be implemented by a semiconductor memory or the like.
In the example of fig. 1, one server apparatus 30 is illustrated, but the control system 100 may include a plurality of server apparatuses 30.
Action
Next, the operation of the control system 100 will be described.
[ switching action of communication network between control device and controlled device ]
First, a switching operation of the communication network between the control device 10 and the controlled device 20 of the control system 100 will be described.
First example
Fig. 2 is a flowchart showing a first example of a switching operation of the communication network between the control device 10 and the controlled device 20.
Although not shown, the input receiving unit 14 of the control device 10 receives a predetermined operation performed by a user. For example, the user can confirm a display (for example, a mark indicating that Wi-Fi (registered trademark) is connected) indicating that the control device 10 is connected to the local communication network, which is displayed on the display unit 15 of the control device 10, and when the control device 10 is connected to the local communication network, an instruction to control the controlled device 20 via the local communication network is input by performing the above-described predetermined operation.
The control device 10 determines whether or not communication between the control device 10 and the controlled device 20 via the local communication network is possible when the predetermined operation is accepted (S101). For example, the control unit 12 of the control device 10 may cause the first communication unit 11a to transmit a signal to the controlled device 20 via the local communication network, and determine whether or not communication between the control device 10 and the controlled device 20 via the local communication network is possible, based on whether or not the first communication unit 11a receives a response signal from the controlled device 20.
When it is determined that communication between the control device 10 and the controlled device 20 via the local communication network is possible (S101: "yes"), the control unit 12 of the control device 10 controls the first communication unit 11a so that the control device 10 communicates with the controlled device 20 via the local communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the local communication network (S102).
On the other hand, when it is determined that communication between the control device 10 and the controlled device 20 via the local communication network is not possible (S101: "no"), the control unit 12 of the control device 10 controls the second communication unit 11b so as to communicate with the controlled device 20 via the wide area communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the wide area communication network (S103).
As described above, the control system 100 preferentially uses the local communication network in the case where communication is possible between the control apparatus 10 and the controlled apparatus 20 via the local communication network, and therefore can perform communication with lower delay and more stability than the case where only the wide area communication network is used.
Second example
Next, a second example of the switching operation of the communication network between the control device 10 and the controlled device 20 will be described. Fig. 3 is a flowchart showing a second example of the switching action of the communication network between the control device 10 and the controlled device 20. Steps S202, S203, and S204 of fig. 3 correspond to steps S101, S102, and S204 of fig. 2, respectively.
In the first example, it is determined whether or not communication between the control device 10 and the controlled device 20 is possible via the local communication network, in response to receiving a predetermined operation by the user. The second example differs from the first example in that: in the case where the control apparatus 10 is connectable to the local communication network, it is determined whether or not communication between the control apparatus 10 and the controlled apparatus 20 is possible via the local communication network. Here, the description will be mainly focused on points different from the first example, and the description will be simplified or omitted for repeated contents.
For example, when the input receiving unit 14 of the control device 10 receives an input (not shown) of a control instruction to the controlled device 20 by a user, the control unit 12 of the control device 10 determines whether or not the control device 10 is connectable to the local communication network (S201). When it is determined that the control device 10 is connectable to the local communication network (S201: yes), the control unit 12 determines whether or not the control device 10 is able to communicate with the controlled device 20 via the local communication network (S202). When it is determined that the control apparatus 10 is able to communicate with the controlled apparatus 20 via the local communication network (S202: "yes"), the control apparatus 10 communicates with the controlled apparatus 20 via the local communication network (S203). On the other hand, when it is determined that the control device 10 cannot communicate with the controlled device 20 via the local communication network (S202: "no"), the control device 10 communicates with the controlled device 20 via the wide area communication network (S204).
On the other hand, when it is determined in step S201 that the control apparatus 10 cannot be connected to the local communication network (no), the control apparatus 10 communicates with the controlled apparatus 20 via the wide area communication network (S204).
Next, the detailed flow of step S202 will be described. Fig. 4 is a flowchart showing an example of the detailed flow of step S202 in fig. 3. Steps S301, S305, and S308 of fig. 4 correspond to steps S201, S203, and S204 of fig. 3, respectively.
The control unit 12 of the control device 10 determines whether or not the control device 10 is connectable to the local communication network (S301), and if it is determined that the control device 10 is connectable to the local communication network (yes), transmits a signal to the controlled device 20 via the first communication unit 11 a. Thereby, the control device 10 transmits a signal to the controlled device 20 via the local communication network (S302).
When the control device 10 receives the response signal from the controlled device 20 (S303: yes), the control section 12 determines that the control device 10 is able to communicate with the controlled device 20 via the local communication network (S304). Then, the control section 12 controls the first communication section 11a so that the control device 10 communicates with the controlled device 20 via the local communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the local communication network (S305).
On the other hand, in the case where the control device 10 does not receive the response signal from the controlled device 20 in step S303 (no), the control section 12 determines whether the number of times the response signal from the controlled device 20 is not received has reached N times in succession (n≡2) (S306). When it is determined that the number of times of receiving the response signal from the controlled device 20 has not reached N consecutive times (S306: no), the control unit 12 returns to the process of step S302. In this way, the control apparatus 10 repeatedly transmits a signal to the controlled apparatus 20. On the other hand, when it is determined that the number of times of receiving no response signal from the controlled device 20 has reached N continuously (S306: "yes"), the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network (S307). Then, the control section 12 controls the second communication section 11b so that the control device 10 communicates with the controlled device 20 via the wide area communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the wide area communication network (S308).
On the other hand, when it is determined in step S301 that the control device 10 cannot be connected to the local communication network (no), the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network (S307). Then, the control apparatus 10 communicates with the controlled apparatus 20 via the wide area communication network (S308).
As described above, the control system 100 can switch which one of the local communication network and the wide area communication network is to be used in accordance with the communication states of the control apparatus 10 and the controlled apparatus 20, respectively.
The control system 100 can determine whether communication between the control device 10 and the controlled device 20 via the local network is possible without using the wide area communication network, based on the presence or absence of a response signal to a signal transmitted by the control device 10 via the local communication network.
Further, the control system 100 can increase the possibility of being able to establish local communication between the control apparatus 10 and the controlled apparatus 20 by setting a threshold value for the number of times the response signal is not received and determining the number of times the response signal is not received, instead of determining that communication with the controlled apparatus 20 is impossible only once by the control apparatus 10. Thus, even in a case where, for example, the power supply of the controlled device 20 is cut off or it takes time until the radio wave condition stabilizes, although the controlled device 20 can communicate via the local communication network, the control system 100 can establish local communication between the control device 10 and the controlled device 20.
Modification 1 of the second example
Next, modification 1 of the second example will be described. Fig. 5 is a flowchart showing a modification 1 of the second example of the switching operation of the communication network between the control device 10 and the controlled device 20. Steps S401 to S403, S404, S405, S410, S411, and S412 of fig. 5 correspond to steps S301 to S303, S304, S305, S307, S308, and S306 of fig. 4, respectively.
In the second example, when the number of times the control device 10 does not receive the response signal from the controlled device 20 is N (n≡2) times in succession, the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network. Modification 1 of the second example differs from the second example in that: when the number of times the control device 10 does not receive the response signal from the controlled device 20 is the first time, it is determined whether or not the access point is stored, and when the access point is stored, the communication scheme is changed to resend the signal to the controlled device 20.
The control unit 12 of the control device 10 determines whether or not the control device 10 is connectable to the local communication network (S401), and if it is determined that the control device 10 is connectable to the local communication network (yes), transmits a signal to the controlled device 20 via the first communication unit 11 a. Thereby, the control device 10 transmits a signal to the controlled device 20 via the local communication network (S402).
When the control device 10 receives the response signal from the controlled device 20 (S403: yes), the control section 12 determines that the control device 10 is able to communicate with the controlled device 20 via the local communication network (S404), and controls the first communication section 11a so that the control device 10 communicates with the controlled device 20 via the local communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the local communication network (S405).
On the other hand, in the case where the control device 10 does not receive the response signal from the controlled device 20 in step S403 (no), the control section 12 determines whether the number of times the control device 10 does not receive the response signal from the controlled device 20 is the first time (S406). When it is determined that the number of times the control device 10 has not received the response signal from the controlled device 20 is not the first time (S406: NO), the control unit 12 determines whether the number of times the response signal from the controlled device 20 has not been received has reached N consecutive times (S412). When it is determined that the number of times of receiving the response signal from the controlled device 20 has not reached N continuously (S412: no), the control unit 12 returns to the process of step S402. On the other hand, when it is determined that the number of times the response signal from the controlled device 20 has not been received has reached N consecutive times (yes in S412), the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network (in other words, cannot communicate with the controlled device 20 via the local communication network) (S410). Then, the control section 12 controls the second communication section 11b so that the control device 10 communicates with the controlled device 20 via the wide area communication network. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 via the wide area communication network (S411).
On the other hand, when it is determined in step S406 that the number of times the control device 10 does not receive the response signal from the controlled device 20 is the first time ("yes"), the control unit 12 determines whether or not the access point is stored in the storage unit 13 (S407). For example, when the control device 10 communicates with the controlled device 20 via the local communication network, the control device may store the access point in the storage unit 13 as a communication history, and the control unit 12 may determine whether or not the access point used for communication with the controlled device 20 stores the communication history in the storage unit 23. When it is determined that the access point is not stored (S407: no), the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network (S410), and the control device 10 communicates with the controlled device 20 via the wide area communication network (S411).
On the other hand, when it is determined in step S407 that the access point is stored ("yes"), the control unit 12 causes the first communication unit 11a to transmit a signal to the controlled device 20 in a multicast manner. Thereby, the control device 10 transmits a signal to the controlled device in a multicast manner via the local communication network (S408). When receiving the response signal from the controlled device 20 (S409: yes), the control section 12 determines that the control device 10 is able to communicate with the controlled device 20 via the local communication network (S404), and the control device 10 communicates with the controlled device 20 via the local communication network (S405).
On the other hand, when it is determined in step S409 that the response signal has not been received from the controlled device 20 (no), the control unit 12 determines that the control device 10 cannot communicate with the controlled device 20 via the local communication network (S410), and the control device 10 communicates with the controlled device 20 via the wide area communication network (S411).
As described above, since the access point that was able to perform local communication with the controlled device 20 before is stored in the storage unit 13 of the control device 10, for example, in the case where the control device 10 transmits a signal to the controlled device 20 in a unicast manner via the local communication network without receiving a response signal, the control device 10 transmits a signal to the controlled device 20 in a multicast manner via the local communication network, whereby the possibility of establishing local communication between the control device 10 and the controlled device 20 increases even in the case where the IP address of the controlled device 20 is changed.
In addition, for example, when the controlled device 20 is in a state where it cannot be connected to the local communication network, the control system 100 can appropriately determine that communication between the control device 10 and the controlled device 20 via the local communication network is not possible.
[ action of establishing communication scheme at communication via local communication network ]
Next, an operation of the control device 10 to establish a communication scheme with the controlled device 20 based on a response signal from the controlled device 20 in a case where communication between the control device 10 and the controlled device 20 via the local communication network is possible will be described. Here, the local communication network is a wireless local communication network. The controlled device 20 includes an external communication module, which is, for example, the first communication unit 21a. Next, an example will be described in which the controlled device 20 performs local communication with the control device 10 via the communication module (first communication section 21 a) in a manner not to perform encryption or in a manner to perform encryption.
First example
Fig. 6 is a flowchart showing a first example of the operation of establishing the communication scheme at the time of communication via the local communication network between the control device 10 and the controlled device 20. In the first example, a case will be described in which the control apparatus 10 and the controlled apparatus 20 hold encryption keys in advance.
When communication between the control device 10 and the controlled device 20 via the local communication network is enabled, the control unit 12 of the control device 10 causes the first communication unit 11a to transmit a signal to the controlled device 20 in the clear. In other words, the control device 10 transmits a signal to the controlled device 20 in plain text (S501).
When it is determined that the response signal indicating that communication is possible in the clear is received from the controlled device 20 (S502: yes), the control unit 12 of the control device 10 communicates with the controlled device 20 without encryption (S503).
On the other hand, when it is determined in step S502 that the response signal indicating that communication is possible in the clear is not received from the controlled device 20 (no), the control unit 12 causes the first communication unit 11a to transmit the signal to the controlled device 20 in an encrypted manner. In other words, the control device 10 cryptographically transmits a signal to the controlled device 20 (S504). In addition, in the case where the control apparatus 10 and the controlled apparatus 20 do not hold the encryption key in advance, the control section 12 of the control apparatus 10 transmits a signal to the controlled apparatus 20 in an encrypted manner after performing authentication and exchange of the encryption key with the controlled apparatus 20 (not shown). Then, the control section 12 controls the first communication section 11a based on the response signal from the controlled device 20 such that the first communication section 11a communicates with the controlled device 20 in an encrypted manner. Thereby, the control apparatus 10 communicates with the controlled apparatus 20 in an encrypted manner based on the response signal from the controlled apparatus 20 (S505).
Next, an example of the operation of the control device 10 in the case where step S502 is no will be described. Fig. 7 is a flowchart showing an example of a detailed flow of the operation of the control device 10 in the case of no in step S502 of fig. 6.
When it is determined in step S502 in fig. 6 that the response signal indicating that communication is possible in plain text has not been received from the controlled device 20 (no), the control unit 12 of the control device 10 determines whether or not a response signal indicating that communication is not possible in plain text has been received (S601). When the control unit 12 determines that a response signal indicating that communication in the clear cannot be performed is received from the controlled device 20 (S601: yes), the control unit 12 transmits a signal to the controlled device 20 in an encrypted manner via the first communication unit 11a (S602). When receiving the response signal from the controlled device 20 (S603, yes), the control unit 12 controls the device 10 to communicate with the controlled device 20 by encrypting (S604). On the other hand, when the response signal is not received from the controlled device 20 (S603: no), the control unit 12 determines that communication with the controlled device 20 is not possible (in other words, communication with the controlled device 20 is not possible) (S605). At this time, the control unit 12 may notify the user that communication with the controlled device 20 is not possible. The control unit 12 may notify the user by causing the display unit 15 to display a message such as "communication with the controlled device is impossible" or an image obtained by superimposing an x or exclamation mark on a schematic diagram of the controlled device. The control unit 12 may suspend communication with the controlled device 20 based on the instruction of the user received by the input receiving unit 14, or may suspend communication with the controlled device 20 based on the above determination.
As described above, the control system 100 can appropriately determine that the controlled device 20 cannot communicate in an encrypted manner. In addition, the control system 100 can appropriately determine that the communication between the control apparatus 10 and the controlled apparatus 20 is disabled when the controlled apparatus 20 does not support communication without encryption and the control apparatus 10 does not receive a response signal to the encrypted signal from the controlled apparatus 20.
Modification 1 of the first example
Next, modification 1 of the first example will be described. Fig. 8 is a flowchart showing an example of the response operation of the controlled device 20 in modification 1 of the first example of the communication scheme establishment operation. In the first example, when receiving a response signal indicating that communication in the clear is not possible from the controlled device 20 (yes in S601 of fig. 7), the control device 10 transmits a signal to the controlled device 20 in an encrypted manner (S602). The modification of the first example differs from the first example in that: if yes in step S601, the control device 10 transmits a signal including the own identification information to the controlled device 20. Next, an example of the response operation in the case where the controlled device 20 receives a signal including the identification information of the control device 10 will be described.
In step S601 in fig. 7, when the control device 10 receives a response signal indicating that communication in clear text is impossible from the controlled device (yes), the control device 10 transmits a signal (not shown) including its own identification information to the controlled device 20 via the first communication unit 11 a. At this time, sharing of the encryption key is not performed between the control apparatus 10 and the controlled apparatus 20, and therefore, the signal is transmitted in an unencrypted manner.
When receiving the signal from the control device 10 via the first communication unit 21a (S701), the control unit 22 of the controlled device 20 determines whether or not the identification information included in the received signal is stored in the storage unit 23 (S702). When it is determined that the identification information is stored in the storage unit 23 (yes in S702), the control unit 22 of the controlled device 20 transmits a response signal to the control device 10 (S703). On the other hand, when it is determined that the identification information is not stored in the storage unit 23 (S702: no), the control unit 22 does not transmit a response signal to the control device 10 (S704).
As described above, the control system 100 can perform communication with higher security by the controlled device 20 transmitting the response signal to the control device 10 when the identification information of the control device 10 matches the identification information stored in the storage unit 23 of the controlled device 20 in advance.
Modification 2 of the first example
In the first example and the modification 1 of the first example, when the control device 10 and the controlled device 20 communicate with each other in an encrypted manner, the control device 10 and the controlled device 20 may cooperatively generate a common encryption key.
Although not shown, when receiving a response signal to the encrypted signal from the controlled device 20 (for example, S604 of fig. 7: "yes"), the control device 10 transmits a first random number to the controlled device 20. The controlled device 20, when acquiring the first random number transmitted from the control device 10, transmits a second random number different from the first random number to the control device 10. Further, the transmission/reception of the random number including the transmission/reception of the first random number and the second random number may be performed at least once between the control device 10 and the controlled device 20.
The control device 10 and the controlled device 20 each generate a common encryption key based on the first random number and the second random number. The generated common encryption key is stored in the storage section 13 of the control device 10 and the storage section 23 of the controlled device 20.
As described above, in the case where the control device 10 and the controlled device 20 can communicate with each other in an encrypted manner, the control system 100 can generate a common encryption key by transmitting random numbers to each other, and therefore, it is not necessary to store the encryption key in advance.
[ Effect etc. ]
As described above, the control system 100 includes: a controlled device 20; and a control device 10 for controlling the controlled device 20, wherein the control device 10 determines whether or not communication between the control device 10 and the controlled device 20 is possible via a local communication network, the control device 10 communicates with the controlled device 20 via the local communication network when it is determined that communication between the control device 10 and the controlled device 20 is possible via the local communication network, and the control device 10 communicates with the controlled device 20 via a wide area communication network when it is determined that communication between the control device 10 and the controlled device 20 is not possible via the local communication network.
Such a control system 100 preferentially uses the local communication network in the case where communication between the control apparatus 10 and the controlled apparatus 20 is possible via the local communication network, and therefore, can perform communication with lower delay and more stability than the case where only the wide area communication network is used.
For example, in the control system 100, the control device 10 determines whether or not the control device 10 is connectable to the local communication network, and if it is determined that the control device 10 is connectable to the local communication network, the control device 10 determines whether or not communication is possible between the control device 10 and the controlled device 20 via the local communication network, and if it is determined that the control device 10 is unable to connect to the local communication network, the control device 10 communicates with the controlled device 20 via the wide area communication network.
Such a control system 100 is capable of switching which one of the local communication network and the wide area communication network is to be used in accordance with the respective communication states of the control apparatus 10 and the controlled apparatus 20.
For example, in the control system 100, the control device 10 transmits a signal to the controlled device 20 via the local communication network, and when a response signal to the signal is received from the controlled device 20, it is determined that communication between the control device 10 and the controlled device 20 is possible via the local communication network.
Such a control system 100 can easily determine whether communication between the control device 10 and the controlled device 20 via the local network is possible without using the wide area communication network, based on the presence or absence of a response signal to a signal transmitted by the control device 10 via the local communication network.
For example, in the control system 100, the control device 10 repeatedly transmits a signal to the controlled device 20, and determines that communication between the control device 10 and the controlled device 20 via the local communication network is impossible when the number of times a response signal to the signal is not received from the controlled device 20 is N (N is 2 or more) times or more.
Such a control system 100 can establish local communication between the control device 10 and the controlled device 20 even when there is a situation in which, for example, the power supply of the controlled device 20 is cut off or it takes time until the radio wave condition stabilizes, although the controlled device 20 can communicate via the local communication network.
For example, in the control system 100, when the control device 10 communicates with the controlled device 20 via the local communication network, the control device 10 stores the access point used for the communication in the storage unit 13, and when the control device 10 does not receive a response signal to the signal from the controlled device 20, it determines whether or not the access point is stored in the storage unit 13, and when the access point is stored in the storage unit 13, the control device 10 transmits the signal to the controlled device 20 via the local communication network in a multicast manner.
Since the access point that has been able to communicate locally with the controlled device 20 before is stored in the storage unit 13 of the control device 10, for example, in a case where the control device 10 transmits a signal to the controlled device 20 in a unicast manner via the local communication network without receiving a response signal, the control device 10 transmits a signal to the controlled device 20 in a multicast manner via the local communication network, whereby the possibility of establishing local communication between the control device 10 and the controlled device 20 increases even in a case where the IP address of the controlled device 20 is changed.
For example, in the control system 100, the control device 10 determines that communication between the control device 10 and the controlled device 20 via the local communication network is impossible when no response signal for the multicast-transmitted signal is received from the controlled device 20.
Such a control system 100 can appropriately determine that communication between the control device 10 and the controlled device 20 via the local communication network is impossible, for example, when the controlled device 20 is in a state where it cannot be connected to the local communication network.
For example, in the control system 100, when communication is possible between the control device 10 and the controlled device 20 via the local communication network, the control device 10 transmits a signal to the controlled device 20 in the clear text, the control device 10 communicates with the controlled device 20 in a communication manner without encryption when receiving a response signal indicating that communication is possible in the clear text from the controlled device 20, the control device 10 transmits a signal to the controlled device 20 in an encrypted manner when not receiving a response signal indicating that communication is possible in the clear text from the controlled device 20, and the control device 10 communicates with the controlled device 20 in a communication manner with encryption based on the presence or absence of a response signal to the encrypted signal from the controlled device 20.
Such a control system 100 can appropriately switch whether or not to encrypt communication between the control device 10 and the controlled device 20, for example, depending on the type of the controlled device 20, such as a device that transmits and receives highly confidential information, such as personal information, like a biometric information sensor, and a device that transmits and receives less confidential information, such as a lighting device. In more detail, the control system 100 can switch in the following manner: the device that transmits and receives the highly confidential information performs communication in an encrypted manner, and the device that transmits and receives the less confidential information performs communication in an unencrypted manner at a communication speed faster than that of the encrypted manner. Thus, the control system 100 can improve the safety of communication and the communication speed.
For example, in the control system 100, when receiving a response signal for an encrypted signal from the controlled device 20, the control device 10 communicates with the controlled device 20 in an encrypted communication manner, and when not receiving a response signal for an encrypted signal from the controlled device 20, the control device 10 determines that communication with the controlled device 20 is impossible.
Such control system 100 can appropriately determine that the controlled device 20 cannot communicate in an encrypted manner. In addition, the control system 100 can appropriately determine that the communication between the control apparatus 10 and the controlled apparatus 20 is disabled when the controlled apparatus 20 does not support communication without encryption and the control apparatus 10 does not receive a response signal to the encrypted signal from the controlled apparatus 20.
For example, in the control system 100, the controlled device 20 stores the identification information of the control device 10 in the storage unit 23 in advance, and when the controlled device 20 receives the signal transmitted in an encrypted manner from the control device 10, it is determined whether or not the identification information included in the signal is stored in the storage unit 23, and when it is determined that the identification information is stored in the storage unit 23, the controlled device 20 transmits a response signal to the control device 10, and when it is determined that the identification information is not stored in the storage unit 23, the controlled device 20 does not transmit the response signal to the control device 10.
Such control system 100 enables communication with higher security because the controlled device 20 transmits a response signal to the control device 10 when the identification information of the control device 10 matches the identification information stored in the storage unit 23 of the controlled device 20 in advance.
For example, in the control system 100, the control device 10 transmits a first random number to the controlled device 20 upon receiving a response signal for the encrypted signal from the controlled device 20, the controlled device 20 transmits a second random number different from the first random number transmitted from the control device to the control device 10, and the control device 10 and the controlled device 20 each generate a common encryption key based on the first random number and the second random number.
In such a control system 100, when the control device 10 and the controlled device 20 can communicate with each other in an encrypted manner, the control device 10 and the controlled device 20 can generate a common encryption key by transmitting random numbers to each other, and therefore, it is not necessary to store the encryption key in advance.
For example, the control system 100 further includes a communication module (for example, the first communication unit 21 a) that is attached to the controlled device 20, and the controlled device 20 performs local communication with the control device 10 via the communication module in a manner that does not encrypt or encrypts.
Such a control system 100 enables communication between the control device 10 and the controlled device 20 via an external communication module supporting local communication by providing the controlled device 20 with the external communication module, with or without encryption.
For example, in the control system 100, the local communication network is a wireless local communication network, and the wide area communication network is a wireless wide area communication network.
In such a control system 100, for example, even if the control device 10 is a mobile device such as a smart phone, the control device 10 can communicate with the controlled device 20, and the installation position of the controlled device 20 in the building can be flexibly changed, so that convenience is improved.
For example, in the control system 100, the wireless wide area communication network is a mobile line network.
With such a control system 100, for example, even if the control apparatus 10 is a movable apparatus such as a smart phone, the control apparatus 10 can communicate with the controlled apparatus 20, and thus convenience improves.
In addition, a control method executed by a computer such as the control system 100 is a control method for controlling communication between the controlled device 20 and the control device 10 for controlling the controlled device 20, the control method including: a determination step of determining whether or not communication between the control device 10 and the controlled device 20 is possible via the local communication network; a local communication step of, when it is determined that communication between the control device 10 and the controlled device 20 is possible via a local communication network, communicating with the controlled device 20 via the local communication network; and a wide area communication step of, when it is determined that communication between the control apparatus 10 and the controlled apparatus 20 via the local communication network is impossible, communicating with the controlled apparatus 20 via the wide area communication network.
Such a control method preferentially uses the local communication network in the case where communication can be performed between the control apparatus 10 and the controlled apparatus 20 via the local communication network, and therefore, communication with lower delay and more stability can be performed than in the case where only the wide area communication network is used.
For example, in a control method executed by a computer such as the control system 100, the local communication step includes: a first signal transmission step of transmitting a signal in plain text to the controlled device 20; a first communication step of, upon receiving a response signal indicating that communication is possible in plain text from the controlled device 20, communicating with the controlled device 20 in a communication manner without encryption; a second signal transmission step of, when a response signal indicating that communication is possible in plain text is not received from the controlled device 20, transmitting the signal to the controlled device 20 in an encrypted manner; and a second communication step of communicating with the controlled device 20 in an encrypted communication manner based on the presence or absence of a response signal from the controlled device 20 to the encrypted signal transmitted in the second signal transmission step.
Such a control method can appropriately switch whether or not to encrypt communication between the control device 10 and the controlled device 20, for example, depending on the type of the controlled device 20 such as a device that transmits and receives highly confidential information such as personal information, for example, a biometric information sensor, and a device that transmits and receives less confidential information such as a lighting device, for example. Thus, the control method can improve the safety of communication and the communication speed.
(other embodiments)
The embodiments have been described above, but the present invention is not limited to the above embodiments.
For example, in the above embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of the plurality of processes may be changed, or the plurality of processes may be executed in parallel. The operation examples of the above embodiments may be arbitrarily combined.
In the above embodiment, each component may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.
The respective components may be realized by hardware. For example, each component may be a circuit (or an integrated circuit). These circuits may be integrally formed as one circuit or may be separate circuits. Each of these circuits may be a general-purpose circuit or a dedicated circuit.
The whole or specific embodiments of the present invention can be realized by a recording medium such as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. In addition, any combination of the system, the apparatus, the method, the integrated circuit, the computer program, and the recording medium may be realized.
For example, the present invention may be implemented as a control method executed by a computer such as a control system, a program for causing a computer to execute such a control method, or a computer-readable non-transitory recording medium storing such a program. A control method executed by a computer such as the control system 100 is a control method for controlling communication between the controlled device 20 and the control device 10 for controlling the controlled device 20, the control method including: a determination step of determining whether or not communication between the control device 10 and the controlled device 20 is possible via the local communication network; a local communication step of, when it is determined that communication between the control device 10 and the controlled device 20 is possible via a local communication network, communicating with the controlled device 20 via the local communication network; and a wide area communication step of, when it is determined that communication between the control apparatus 10 and the controlled apparatus 20 via the local communication network is impossible, communicating with the controlled apparatus 20 via the wide area communication network. In the control method executed by a computer such as the control system 100, for example, the local communication step may include: a first signal transmission step of transmitting a signal in plain text to the controlled device 20; a first communication step of, upon receiving a response signal indicating that communication is possible in plain text from the controlled device 20, communicating with the controlled device 20 in a communication manner without encryption; a second signal transmission step of, when a response signal indicating that communication is possible in plain text is not received from the controlled device 20, transmitting the signal to the controlled device 20 in an encrypted manner; and a second communication step of communicating with the controlled device 20 in an encrypted communication manner based on the presence or absence of a response signal from the controlled device 20 to the encrypted signal transmitted in the second signal transmission step.
In addition, the present invention also includes modes obtained by implementing various modifications, which are conceivable to those skilled in the art, on each embodiment, or modes obtained by arbitrarily combining the constituent elements and functions in each embodiment within the scope not departing from the gist of the present invention.
Description of the reference numerals
10: a control device; 13: a storage unit; 20: a controlled device; 23: a storage unit; 100: and a control system.
Claims (16)
1. A control system is provided with:
a controlled device; and
a control device for controlling the controlled device,
wherein the control device determines whether communication is possible between the control device and the controlled device via a local communication network,
the control device communicates with the controlled device via the local communication network in the case where it is determined that communication between the control device and the controlled device via the local communication network is possible,
the control device communicates with the controlled device via a wide area communication network when it is determined that communication between the control device and the controlled device via the local communication network is not possible.
2. The control system of claim 1, wherein,
the control device determines whether the control device is capable of connecting to the local communication network,
the control device, in the case where it is determined that the control device is connectable to the local communication network, determines whether communication is possible between the control device and the controlled device via the local communication network,
the control device communicates with the controlled device via the wide area communication network when it is determined that the control device cannot connect to the local communication network.
3. The control system according to claim 1 or 2, wherein,
the control device transmits a signal to the controlled device via the local communication network, and when a response signal to the signal is received from the controlled device, it is determined that communication between the control device and the controlled device via the local communication network is possible.
4. The control system of claim 3, wherein,
the control device repeatedly transmits a signal to the controlled device, and determines that communication between the control device and the controlled device via the local communication network is impossible when the number of times the response signal to the signal is not received from the controlled device is N or more in succession, where N is 2 or more.
5. The control system of claim 3, wherein,
when the control device communicates with the controlled device via the local communication network, the control device stores an access point used for the communication in a storage unit,
the control device determines whether the access point is stored in the storage section or not in a case where the response signal to the signal is not received from the controlled device,
in case the access point is stored, the control device sends the signal to the controlled device in multicast via the local communication network.
6. The control system of claim 5, wherein,
the control device determines that communication between the control device and the controlled device via the local communication network is impossible, when the response signal to the signal transmitted in the multicast manner is not received from the controlled device.
7. The control system of claim 1, wherein,
in the case where communication between the control device and the controlled device via the local communication network is enabled, the control device sends a signal to the controlled device in plain text,
The control device, upon receiving a response signal indicating that communication is possible in plain text from the controlled device, communicates with the controlled device in a communication manner without encryption,
the control device, when not receiving the response signal indicating that communication is possible in plain text from the controlled device, encrypts a signal to the controlled device, and communicates with the controlled device in an encrypted communication manner based on the presence or absence of the response signal from the controlled device to the encrypted signal.
8. The control system of claim 7, wherein,
the control device, upon receiving the response signal for the encrypted signal from the controlled device, communicates with the controlled device in an encrypted communication manner,
the control device determines that communication with the controlled device is impossible if the response signal for the encrypted signal from the controlled device is not received.
9. The control system of claim 7, wherein,
the controlled device stores the identification information of the control device in a storage section in advance,
The controlled device, when receiving the signal sent in an encrypted manner from the control device, determines whether the identification information contained in the signal is stored in the storage section,
the controlled device transmits the response signal to the control device when it is determined that the identification information is stored in the storage section,
the controlled device does not transmit the response signal to the control device when it is determined that the identification information is not stored in the storage unit.
10. The control system of claim 7, wherein,
the control device, upon receiving the response signal from the controlled device for the encrypted signal, sends a first random number to the controlled device,
the controlled device transmits a second random number different from the first random number transmitted from the control device to the control device,
the control device and the controlled device each generate a common encryption key based on the first random number and the second random number.
11. The control system of claim 7, wherein,
the control system further comprises a communication module which is arranged on the controlled equipment,
The controlled device communicates locally with the control device via the communication module either unencrypted or encrypted.
12. The control system of claim 1, wherein,
the local communication network is a wireless local communication network,
the wide area communication network is a wireless wide area communication network.
13. The control system of claim 12, wherein,
the wireless wide area communication network is a mobile line network.
14. A control method for controlling communication between a controlled device and a control device for controlling the controlled device, the control method comprising:
a determination step of determining whether or not communication between the control device and the controlled device is possible via a local communication network;
a local communication step of, when it is determined that communication between the control device and the controlled device is possible via the local communication network, communicating with the controlled device via the local communication network; and
and a wide area communication step of communicating with the controlled device via a wide area communication network when it is determined that communication between the control device and the controlled device via the local communication network is impossible.
15. The control method according to claim 14, wherein,
the local communication step includes:
a first signal transmission step of transmitting a signal in plain text to the controlled device;
a first communication step of, upon receiving a response signal indicating that communication is possible in plain text from the controlled device, communicating with the controlled device in a communication manner without encryption,
a second signal transmission step of, when the response signal indicating that communication is possible in a plain text is not received from the controlled device, transmitting a signal to the controlled device in an encrypted manner; and
a second communication step of communicating with the controlled device in an encrypted communication manner based on the presence or absence of the response signal from the controlled device to the encrypted signal transmitted in the second signal transmission step.
16. A program for causing a computer to execute the control method according to claim 14 or 15.
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| JP2021-073685 | 2021-04-23 | ||
| PCT/JP2022/017642 WO2022224882A1 (en) | 2021-04-23 | 2022-04-12 | Control system, control method, and program |
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| JP2008099112A (en) * | 2006-10-13 | 2008-04-24 | Canon Inc | Method of improving interconnectivity |
| JP6300511B2 (en) * | 2013-12-19 | 2018-03-28 | キヤノン株式会社 | System and execution instruction method |
| JP2016005228A (en) * | 2014-06-19 | 2016-01-12 | 三菱電機株式会社 | Terminal device and radio device |
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