Terminal device and wireless communication system

• US 9,723,640 B2
• Filed: 10/20/2014
• Issued: 08/01/2017
• Est. Priority Date: 11/07/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Noda, Masaaki
• Primary Examiner(s): Magloire, Vladimir
• Assistant Examiner(s): DONADO, FRANK E
• Application Number:
  US14/913,362
• Publication Number:
  US 20160205706A1
• Time in Patent Office: 1,016 Days
• Field of Search: None
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: G06F 9/4406 Loading of operating system
• CPC Class Codes: G06F 9/4416 Network booting; Remote initial program loading [RIPL]
• CPC Class Codes: H04L 12/2816 Controlling appliance services of a home automation network by calling their functionalities 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 H04Q9/00
• CPC Class Codes: H04L 12/2823 Reporting information sensed by appliance or service execution status of appliance services in a home automation network device-related reporting H04L43/065; 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 H04Q9/00
• CPC Class Codes: H04L 2012/2841 Wireless
• CPC Class Codes: H04L 63/0435 wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06
• CPC Class Codes: H04L 9/0819 Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) network architectures or network communication protocols for key distribution in a packet data network H04L63/062
• CPC Class Codes: H04L 9/0894 Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
• CPC Class Codes: H04W 12/02 Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• CPC Class Codes: H04W 12/04 Key management, e.g. using generic bootstrapping architecture [GBA]
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/50 Secure pairing of devices
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 8/22 Processing or transfer of terminal data, e.g. status or physical capabilities
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

A terminal device is capable of communicating with a master wireless device. The terminal device includes a control circuit. The control circuit has operating modes including a normal mode for outputting startup information relating to startup of the terminal device, and a registration mode for outputting registration information relating to registration with the master wireless device. One of the operating mode of the control circuit shifts to the registration mode based on timing of plural startups of the terminal device. The terminal device can shift to the registration mode using the same operation and mechanism as operating in the normal mode.

Claims

1. A terminal device capable of communicating with a master wireless device, the terminal device comprising a power generator and a control circuit,

wherein the power generator is configured to generate electric power by energy-harvesting utilizing energy generated by movement of the terminal device and supply a power-supply voltage based on the electric power to the control circuit,

wherein the control circuit has operating modes, including a normal operating mode for outputting startup information relating to startup of the terminal device, and a registration mode for outputting registration information relating to registration of the terminal device with the master wireless device,

wherein the control circuit shifts one of the operating modes to the registration mode based on timing of a plurality of startups of the terminal device,

wherein the terminal device stores information of the timing of the plurality of startups of the terminal device in memory as an output pattern, and the terminal device transmits, during the registration mode, an identifier of the terminal device and one of an encryption key or a registration request signal for requesting the master wireless device to transmit an encryption key,

wherein the terminal device further includes a determinator circuit that determines whether or not a predetermined time elapses from a preceding startup to a next startup of the terminal device,

wherein when a waveform of the power-supply voltage rises, the control circuit obtains a time interval from a preceding startup of the terminal device to a next startup of the terminal device and stores a digit composing the output pattern, and

wherein the control circuit compares a predetermined output timing pattern with the output pattern obtained from the plurality of startup timings stored in memory, shifts the normal operating mode to the registration mode when the output pattern coincides with the predetermined output timing pattern and otherwise keeps the operation mode in the normal operating mode.

2. The terminal device according to claim 1, wherein the control circuit determines the timing using an output of the determinator circuit.

3. The terminal device according to claim 2,

wherein the determinator circuit includes a time constant circuit changing, according to a predetermined time constant, a voltage corresponding to the electric power generated by the power generator, and inputting the changed voltage to the control circuit, and

wherein the control circuit determines the timing based on the changed voltage input to the control circuit.

4. The terminal device according to claim 3, wherein the voltage corresponding to the electric power generated by the power generator is supplied to the determinator circuit not via the control circuit.

5. The terminal device according to claim 3, wherein, when the waveform of the power-supply voltage rises, the control circuit compares the changed voltage input to the control circuit with a first predetermined reference value as to obtain the time interval from the preceding startup of the terminal device to the next startup of the terminal device.

6. The terminal device according to claim 5, wherein, when the waveform of the power-supply voltage rises, the control circuit is configured to:

output a first value by comparing the changed voltage input to the control circuit with the first predetermined reference value as to obtain the time interval; and

output a second value different from the first value by comparing the changed voltage input to the control circuit with a second predetermined reference value different from the first predetermined reference value as to obtain the time interval.

7. The terminal device according to claim 1, wherein the terminal device transmits the startup information and the registration information to the master wireless device using the electric power generated by the power generator.

8. The terminal device according to claim 1,

wherein the terminal device is configured to be mounted to a certain body, and

wherein the power generator is configured to generate electric power in response to a movement of the certain body and supply the electric power to the control circuit.

9. A wireless communication system comprising a master wireless device and a terminal device capable of communicating with the master wireless device,

wherein the terminal device includes a power generator and a control circuit,

wherein the power generator is configured to generate electric power by energy-harvesting utilizing energy generated by movement of the terminal device and supply a power-supply voltage based on the electric power to the control circuit,

wherein the control circuit has operating modes, including a normal operating mode for outputting startup information relating to startup of the terminal device, and a registration mode for outputting registration information relating to registration of the terminal device with the master wireless device,

wherein the control circuit shifts one of the operating modes to the registration mode based on timing of a plurality of startups of the terminal device,

wherein the terminal device stores information of the timing of the plurality of startups of the terminal device in memory as an output pattern, and the terminal device transmits, during the registration mode, an identifier of the terminal device and one of an encryption key or a registration request signal for requesting the master wireless device to transmit an encryption key,

wherein the registration information is transmitted to the master wireless device from the terminal device, and received by the master wireless device as to register the terminal device with the master wireless device,

wherein the terminal device further includes a determinator circuit that determines whether or not a predetermined time elapses from a preceding startup to a next startup of the terminal device,

wherein when a waveform of the power-supply voltage rises, the control circuit obtains a time interval from a preceding startup of the terminal device to a next startup of the terminal device and stores a digit composing the output pattern, and

wherein the control circuit compares a predetermined output timing pattern with the output pattern obtained from the plurality of startup timings stored in memory, shifts the normal operating mode to the registration mode when the output pattern coincides with the predetermined output timing pattern and otherwise keeps the operation mode in the normal operating mode.

10. The wireless communication system according to claim 9,

wherein, upon receiving the registration information, the master wireless device transmits an encryption key to the terminal device, and

wherein the terminal device receives and stores the encryption key.

11. The wireless communication system according to claim 10, wherein the encryption key transmitted from the master wireless device to the terminal device is different from another encryption key previously transmitted from the master wireless device.

12. The wireless communication system according to claim 10, wherein transmission power of the master wireless device for transmitting the encryption key is larger than transmission power of the terminal device for transmitting the registration information.

13. The wireless communication system according to claim 9,

wherein the terminal device is configured to be mounted to a certain body, and

wherein the power generator is configured to generate electric power in response to a movement of the certain body and supply the electric power to the control circuit.

14. The wireless communication system according to claim 9, wherein the control circuit determines the timing using an output of the determinator circuit.

15. The wireless communication system according to claim 14,

wherein the determinator circuit includes a time constant circuit changing, according to a predetermined time constant, a voltage corresponding to the electric power generated by the power generator, and inputting the changed voltage to the control circuit, and

wherein the control circuit determines the timing based on the changed voltage input to the control circuit.

16. The communication system according to claim 15, wherein the voltage corresponding to the electric power generated by the power generator is supplied to the determinator circuit not via the control circuit.

17. The wireless communication system according to claim 15, wherein, when the waveform of the power-supply voltage rises, the control circuit compares the changed voltage input to the control circuit with a first predetermined reference value as to obtain the time interval from the preceding startup of the terminal device to the next startup of the terminal device.

18. The wireless communication system according to claim 17, wherein, when the waveform of the power-supply voltage rises, the control circuit is configured to:

output a first value by comparing the changed voltage input to the control circuit with the first predetermined reference value as to obtain the time interval; and

output a second value different from the first value by comparing the changed voltage input to the control circuit with a second predetermined reference value different from the first predetermined reference value as to obtain the time interval.