Remote Wireless Activation and Communication

• US 20090225811A1
• Filed: 03/06/2009
• Published: 09/10/2009
• Est. Priority Date: 03/10/2008
• Status: Active Grant

• Current Assignee: Zenner Performance Meters, Inc. (Zenner International GmbH & Co. KG)
• Original Assignee: Axiometric, LLC
• Inventors: Martinez, John V., Albert, David A.
• Granted Patent: US 7,782,804 B2
• Time in Patent Office: Days
• US Class Current: 375/132
• CPC Class Codes: H04B 2001/71563 Acquisition
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system and method of wireless communication. An activator comprises a first radio that transmits an activation message; a first microprocessor; a first memory component; and a first timer. A remote device comprises a second radio that periodically enters into an activation period of operation and a de-activation period of operation in order to conserve power; a second microprocessor; a second memory component; and a second timer. The first radio transmits the activation message repeatedly and continuously for a period at least equal to the sum of the activation period of operation and the de-activation period of operation of the second radio. At least one complete activation message is transmitted by the activator during every period of time allotted for activation of the second radio. The second radio increases a frequency of activation of the second radio upon receipt of a designated activation message from the first radio.

Claims

1. A communications system comprising:

an activator device comprising;

a first radio device that transmits an activation message;

a first microprocessor operatively connected to said first radio device;

a first memory component operatively connected to said microprocessor; and

a first timer operatively connected to said microprocessor;

a remote device comprising;

a second radio device that periodically enters into an activation period of operation and a de-activation period of operation in order to conserve power;

a second microprocessor operatively connected to said second radio device;

a second memory component operatively connected to said microprocessor; and

a second timer operatively connected to said microprocessor,

wherein said first radio device transmits said activation message repeatedly and continuously for a period at least equal to the sum of said activation period of operation and said de-activation period of operation of said second radio device,

wherein at least one complete activation message is transmitted by said activator device during every period of time allotted for activation of said second radio device, and

wherein said second radio device increases a frequency of activation of said second radio device upon receipt of a designated activation message from said first radio device.

2. The system of claim 1, wherein said activator device transmits said activation message on each of a plurality of radio frequencies in a pseudo-random pattern such that with N frequencies used, at least (N+1) complete messages are transmitted in said time allotted for activation of said second radio device.

3. The system of claim 2, wherein said second radio device is periodically tuned to a different frequency.

4. The system of claim 3, wherein said second radio device extends said activation period of operation upon receipt of said designated activation message, wherein said second radio device enters said de-activation period of operation if an additional designated activation message is not received within the extended activation period, and wherein said second radio device enters an active state of operation following N successive periods of receipt of designated messages and said extended activation period.

5. The system of claim 4, wherein a number of messages received in consecutive periods of said activation period of operation required for said second radio device to be activated varies dynamically based on a number of false activations comprising a period of activation without subsequent communication from said first radio device.

6. The system of claim 1, wherein said activation period of operation of said second radio device varies according to a predetermined programmable schedule.

7. The system of claim 1, wherein said de-activation period of operation continues irrespective of communication occurring at other proximately located remote devices.

8. The system of claim 2, wherein said first radio device transmits a synchronization message to said second radio device on each frequency hopping spread spectrum (FHSS) channel, wherein said synchronization message specifies a frequency channel to be used for a next communication between said first radio device and said second radio device, wherein said first radio device is tuned to the specified frequency channel following transmission of said synchronization message, wherein said second radio device receives said synchronization message on any channel said second radio device is currently tuned to, and wherein said second radio device tunes to the specified next communication frequency channel.

9. The system of claim 8, wherein said second radio device transmits a response to the received synchronization message to said first radio device using any of (i) a same technique of transmission on each FHSS channel as said first radio device uses for said synchronization message transmission, and (ii) the frequency channel specified in said synchronization message.

10. The system of claim 8, wherein each message sent from said first radio device after said synchronization message to said second radio device identifies a specified different frequency channel to be used for the next communication between said first radio device and said second radio device, wherein said first radio device is tuned to said specified new frequency following transmission of said synchronization message, wherein said second radio device is tuned to said specified frequency channel following receipt of said synchronization message for any of transmission of a response message and reception of a next communication message between said first radio device and said second radio device.

11. The system of claim 8, wherein each said synchronization message comprises information sufficient to determine how many synchronization messages remain in a burst of synchronization messages such that said second radio device determines, based on a number of messages remaining and a length of said synchronization message, when the transmission of said synchronization message on all FHSS channels by said first radio device will be complete and when said second radio device is permitted to send a response message without risk of coincidence with any of the synchronization messages.

12. A communications device comprising:

a microprocessor;

a memory component operatively connected to said microprocessor;

a timer operatively connected to said microprocessor; and

a two-way radio component that periodically enters into an activation period of operation and a de-activation period of operation in order to conserve power,

wherein said radio component receives an activation message,

wherein said radio component increases a frequency of activation of said radio component upon receipt of a designated activation message, and

wherein prior to receipt by said radio component, said activation message is repeatedly and continuously transmitted for a period at least equal to the sum of said activation period of operation and said de-activation period of operation of said radio component.

13. The communications device of claim 12, wherein at least one complete activation message is received by said radio component during every period of time allotted for activation of said radio component.

14. The communications device of claim 13, wherein transmission of said activation message occurs on each of a plurality of radio frequencies in a pseudo-random pattern such that with N frequencies used, at least (N+1) complete messages are transmitted in said time allotted for activation of said radio component.

15. The communications device of claim 14, wherein said radio component is periodically tuned to a different frequency.

16. The communications device of claim 15, wherein said radio component extends said activation period of operation upon receipt of said designated activation message, wherein said radio component enters said de-activation period of operation if an additional designated activation message is not received within the extended activation period, and wherein said radio component enters an active state of operation following N successive periods of receipt of designated messages and said extended activation period.

17. The communications device of claim 16, wherein a number of messages received in consecutive periods of said activation period of operation required for said radio component to be activated varies dynamically based on a number of false activations comprising a period of activation without subsequent communication from a remotely-located radio transmitter.

18. The communications device of claim 12, wherein said activation period of operation of said radio component varies according to a predetermined programmable schedule.

19. The communications device of claim 12, wherein said de-activation period of operation continues irrespective of activation and communication occurring at other proximately located communications devices.

20. A method of wireless communication in a system comprising a first radio device and a remotely located second radio device, said method comprising:

transmitting an activation message by said first radio device repeatedly and continuously for a period at least equal to the sum of an activation period of operation and a de-activation period of operation of said second radio device;

receiving the transmitted activation message by said second radio device remotely located from said activator device; and

increasing a frequency of activation of said second radio device upon receipt of a designated activation message from said first radio device,

wherein at least one complete activation message is transmitted during every period of time allotted for activation of said second radio device.

21. The method of claim 20, further comprising transmitting said activation message on each of a plurality of radio frequencies in a pseudo-random pattern such that with N frequencies used, at least (N+1) complete messages are transmitted in said time allotted for activation of said second radio device.

22. The method of claim 21, further comprising periodically tuning said radio to a different frequency.

23. The method of claim 22, further comprising said second radio device extending said activation period of operation upon receipt of said designated activation message, wherein said second radio device enters said de-activation period of operation if an additional designated activation message is not received within the extended activation period, and wherein said second radio device enters an active state of operation following N successive periods of receipt of designated messages and said extended activation period.

24. The method of claim 23, wherein a number of messages received in consecutive periods of said activation period of operation required for said second radio device to be activated varies dynamically based on a number of false activations comprising a period of activation without subsequent communication from said first radio device.

25. The method of claim 20, further comprising varying said activation period of operation of said second radio device according to a predetermined programmable schedule.

26. The method of claim 20, further comprising said second radio device periodically entering into said activation period of operation and said de-activation period of operation in order to conserve power.

27. The method of claim 20, further comprising maintaining said de-activation period of operation irrespective of activation and communication occurring at other proximately located remote devices.

28. The method of claim 21, wherein said first radio device transmits a synchronization message to said second radio device on each frequency hopping spread spectrum (FHSS) channel, wherein said synchronization message specifies a frequency channel to be used for a next communication between said first radio device and said second radio device, wherein said first radio device is tuned to the specified frequency channel following transmission of said synchronization message, wherein said second radio device receives said synchronization message on any channel said second radio device is currently tuned to, and wherein said second radio device tunes to the specified next communication frequency channel.

29. The method of claim 28, wherein said second radio device transmits a response to the received synchronization message to said first radio device using any of (i) a same technique of transmission on each FHSS channel as said first radio device uses for said synchronization message transmission, and (ii) the frequency channel specified in said synchronization message.

30. The method of claim 28, wherein each message sent from said first radio device after said synchronization message to said second radio device identifies a specified different frequency channel to be used for the next communication between said first radio device and said second radio device, wherein said first radio device is tuned to said specified new frequency following transmission of said synchronization message, wherein said second radio device is tuned to said specified frequency channel following receipt of said synchronization message for any of transmission of a response message and reception of a next communication message between said first radio device and said second radio device.

31. The method of claim 28, wherein each said synchronization message comprises information sufficient to determine how many synchronization messages remain in a burst of synchronization messages such that said second radio device determines, based on a number of messages remaining and a length of said synchronization message, when the transmission of said synchronization message on all FHSS channels by said first radio device will be complete and when said second radio device is permitted to send a response message without risk of coincidence with any of the synchronization messages.