Controlled power-efficient operation of wireless communication devices

• US 9,183,733 B2
• Filed: 06/06/2014
• Issued: 11/10/2015
• Est. Priority Date: 05/27/2004
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Kates, Lawrence
• Primary Examiner(s): NWUGO, OJIAKO K
• Application Number:
  US14/298,371
• Publication Number:
  US 20140285336A1
• Time in Patent Office: 522 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: G08B 1/08 using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
• CPC Class Codes: G08B 13/04 by breaking of glass
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 17/10 Actuation by presence of smoke or gases , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
• CPC Class Codes: G08B 21/14 Toxic gas alarms G08B21/16 takes precedence
• CPC Class Codes: G08B 21/182 Level alarms, e.g. alarms responsive to variables exceeding a threshold
• CPC Class Codes: G08B 25/001 Alarm cancelling procedures or alarm forwarding decisions, e.g. based on absence of alarm confirmation
• CPC Class Codes: G08B 25/007 Details of data content structure of message packets; data protocols
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: H04Q 9/00 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
• CPC Class Codes: H04Q 9/02 Automatically-operated arrangements
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A low cost, robust, wireless sensor that provides an extended period of operability without maintenance is described. The wireless sensors are configured to communicate with a base unit or repeater. When the sensor unit detects an anomalous ambient condition (e.g., smoke, fire, water, etc.) the sensor communicates with the base unit and provides data regarding the anomalous condition. The sensor unit receives instructions to change operating parameters and/or control external devices.

Claims

1. A wireless device that functions as part of an in-building wireless sensor system, comprising:

a wireless transceiver capable of wirelessly transmitting and receiving information to and from an electronic device located remotely from the wireless device, wherein the electronic device and the wireless device are configured to be installed within a building as part of the in-building wireless sensor system;

a battery for powering operation of the wireless device;

a sensor configured to take measurements;

a controller operatively coupled to the wireless transceiver and the battery and configured to;

continuously operate the wireless device in a sleep mode whereby the wireless transceiver is inoperable to transmit or receive information and consumption of power from the battery is lower than when the wireless device operates in an awake mode;

periodically and temporarily switch the operation of the wireless device from the sleep mode to the awake mode whereby, while in the awake mode, the wireless transceiver is configured to transmit one or more measurements measured using the sensor of the wireless device as one or more encrypted packets, each encrypted packet comprising a first checksum and first authenticity code for use in verifying an authenticity of the packet; and

in response to a received, encrypted message comprising a second checksum and a second authenticity code, alter a period at which the wireless device switches from the sleep mode to the awake mode such that during a first period the wireless device operates in the sleep mode for a first amount of time before temporarily switching from the sleep mode to the awake mode and that during a second period the wireless device operates in the sleep mode for a second amount of time before temporarily switching from the sleep mode to the awake mode, the second amount of time being greater than the first amount of time.

2. The wireless device of claim 1, wherein the controller is configured to alter the period at which the wireless device switches from the sleep mode to the awake mode in response to receiving an instruction from the electronic device via the wireless transceiver, the period being altered from an old period to a new period, the new period being defined by the instruction.

3. The wireless device of claim 1, wherein the controller is further configured to cause the wireless device to switch from the sleep mode to the awake mode in response to receiving an instruction from the electronic device via the wireless transceiver, the instruction instructing the wireless device to switch from the sleep mode to the awake mode.

4. The wireless device of claim 1, further comprising a sensor configured to sense an ambient condition and generate sensor data based on the sensed ambient condition.

5. The wireless device of claim 4, wherein the controller is further configured to communicate the sensor data to the electronic device via the wireless transceiver while the wireless device is operating in the awake mode, and prevent communication of the sensor data while in the sleep mode.

6. The wireless device of claim 4, wherein the controller is further configured to:

compare the sensor data to a threshold value;

determine whether the sensor data is outside of the threshold value; and

upon determining that the sensor data is outside of the threshold value;

switch from the sleep mode to the awake mode, regardless of the periodic switching from the sleep mode to the awake mode;

while in the awake mode, communicate, to the electronic device via the wireless transceiver, information indicative of the sensor data being outside of the threshold value; and

after communicating the information indicative of the sensor data being outside of the threshold value, returning from the awake mode back to the sleep mode.

7. The wireless device of claim 6, wherein the controller is further configured to listen for instructions while in the awake mode, after communicating the information indicative of the sensor data being outside of the threshold value, and before returning back to the sleep mode.

8. The wireless device of claim 1, wherein the controller is further configured to cause the wireless device listen for one or more instructions while operating in the awake mode, and, in response to receiving the one or more instructions, perform one or more functions requested by the one or more instructions while operating in the awake mode.

9. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein

the sensor is configured to:

sense, while operating in the sleep mode, an ambient environmental condition of a building; and

generate measurements indicative of the ambient environmental condition of the building; and

the controller is further configured to;

while subsequently operating in the awake mode, wirelessly communicate the measurements via the wireless transceiver from the wireless device to an electronic device located remote from the wireless device;

cause the wireless device to remain in the awake mode until it wirelessly receives an acknowledgement that the measurements were received; and

in response to receiving the acknowledgement that the measurements were received, cause the wireless device to enter again into the sleep mode.

10. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the sensor is configured to:

sense an ambient environmental condition of a building; and

generate the measurements that are indicative of the ambient environmental condition of the building; and

the controller is further configured to wirelessly communicate information indicative of the measurements from the wireless device to an electronic device located remote from the wireless device via the wireless transceiver.

11. The wireless device that functions as part of the in-building wireless sensor system of claim 10, wherein the wireless transceiver is further configured to:

determine, prior to wirelessly communicating the information indicative of the sensor data, an available radio frequency channel, wherein the information indicative of the sensor data is wireless communicated from the wireless device to the electronic device located remote from the wireless device over the available radio frequency channel.

12. The wireless device that functions as part of the in-building wireless sensor system of claim 11, wherein the wireless transceiver being configured to determine an available radio frequency channel comprises the wireless transceiver being configured to:

determine that a certain radio frequency channel is in use, and

select an alternative radio frequency channel that is not in use to wirelessly communicate the information indicative of the sensor data.

13. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the controller is further configured to receive during a reset interval, an identifier for the wireless device.

14. The wireless device that functions as part of the in-building wireless sensor system of claim 13, further comprising an electrical connector in communication with the controller, wherein the identifier is received via the electrical connector of the wireless device.

15. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the wireless transceiver is configured to:

wirelessly communicate the measurements utilizing spread-spectrum communication techniques, comprising;

wirelessly communicate, using the spread-spectrum communication techniques, the measurements indicative of an ambient environmental condition of the building while in the awake mode; and

wirelessly receive, while in the awake mode and using the spread-spectrum communication techniques, information from the electronic device including instructions regarding subsequent operation of the wireless device.

16. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the controller is further configured to:

ignore wirelessly-received instructions associated with an identifier that is different from an identifier of the wireless device.

17. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the sensor is configured to periodically monitor an ambient environmental condition of a building while operating in the sleep mode.

18. The wireless device that functions as part of the in-building wireless sensor system of claim 1, wherein the sensor is configured to continuously monitor an ambient environmental condition of a building while operating in the sleep mode.

19. The wireless device of claim 1, wherein the sensor is a smoke and/or carbon monoxide detector and the one or more measurements are smoke and/or carbon monoxide measurements.