System, apparatus and method for managing message communications in systems employing frequency hopping

• US 8,259,775 B1
• Filed: 10/07/2009
• Issued: 09/04/2012
• Est. Priority Date: 10/17/2008
• Status: Active Grant

• Current Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Nichols, Steven
• Primary Examiner(s): Lee, Siu
• Application Number:
  US12/574,994
• Time in Patent Office: 1,063 Days
• Field of Search: 375/130, 375/132, 375/133, 375/134, 375/135, 375/136, 375/137, 375/222, 375/219
• US Class Current: 375/133
• CPC Class Codes: H04W 52/0248 dependent on the time of the day, e.g. according to expected transmission activity
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems, apparatuses and methods for managing message communications in systems employing frequency hopping. One method according to the invention involves transmitting a message via a frequency of a frequency hopping sequence, and determining when the same frequency will reoccur in the frequency hopping sequence. Relevant portions of the device enter a sleep mode, and the device emerges from the sleep mode when the frequency at which the message was transmitted reoccurs in the frequency hopping sequence. The device monitors for a response to the message via the frequency at which the message was transmitted when the frequency reoccurs in the frequency hopping sequence.

Claims

1. A method comprising:

transmitting a message via a frequency of a frequency hopping sequence;

determining when the same frequency will reoccur in the frequency hopping sequence;

entering a sleep mode;

emerging from the sleep mode when the frequency at which the message was transmitted reoccurs in the frequency hopping sequence; and

monitoring for a response to the message via the frequency at which the message was transmitted when the frequency reoccurs in the frequency hopping sequence.

2. The method of claim 1, further comprising:

recognizing that the response was not received during a monitored frequency'"'"'s time slot duration;

determining when the same frequency will again reoccur in the frequency hopping sequence;

reentering the sleep mode;

emerging from the sleep mode when the frequency at which the original message was transmitted reoccurs in the frequency hopping sequence; and

monitoring for the response to the message via the frequency.

3. The method of claim 2, wherein the functions of recognizing that the response was not received, determining when the same frequency will again reoccur, reentering and emerging from the sleep mode, and monitoring for the response are repeated until the response is received.

4. The method of claim 2, wherein the functions of recognizing that the response was not received, determining when the same frequency will again reoccur, reentering and emerging from the sleep mode, and monitoring for the response are repeated a predetermined number of times.

5. The method of claim 1, further comprising:

recognizing that the response was not received during a monitored frequency'"'"'s time slot duration;

determining when the same frequency will again reoccur in the frequency hopping sequence;

reentering the sleep mode;

emerging from the sleep mode when the frequency at which the message was transmitted reoccurs in the frequency hopping sequence; and

monitoring for the response via the frequency immediately following the frequency in the frequency hopping sequence at which the message was transmitted, at the time the frequency of the message transmission reoccurs in the frequency hopping sequence.

6. The method of claim 1, wherein:

transmitting the message comprises transmitting the message via the frequency of the frequency hopping sequence when the frequency arises in a shared frequency hopping sequence;

determining when the same frequency will reoccur comprises determining when the same frequency will reoccur in the shared frequency hopping sequence;

emerging from the sleep mode comprises emerging from the sleep mode when the frequency at which the message was transmitted reoccurs in the shared frequency hopping sequence; and

monitoring for the response comprises monitoring for the response to the message via the frequency at which the message was transmitted when the frequency reoccurs in the shared frequency hopping sequence.

7. The method of claim 6, further comprising:

recognizing that the response was not received during a monitored frequency'"'"'s time slot duration;

determining when a next successive frequency in the local frequency hopping sequence will occur in the shared frequency hopping sequence;

reentering the sleep mode;

emerging from the sleep mode when said next successive frequency reoccurs in the frequency hopping sequence; and

monitoring for the response to the message via said next successive frequency.

8. The method of claim 1, further comprising monitoring for an acknowledgement from a target device indicative of receipt of the message by the target device, wherein the monitoring comprises monitoring for the acknowledgement at the same frequency of the message transmission following transmission of the message.

9. The method of claim 8, wherein monitoring for the acknowledgement at the same frequency comprises turning on a receiver to monitor the frequency in response to transmitting the message at that frequency.

10. The method of claim 8, wherein the monitoring for the acknowledgement further comprises determining that the acknowledgement was not received, and further comprising retransmitting the message via a successive frequency of the frequency hopping sequence.

11. The method of claim 1, wherein entering the sleep mode comprises reducing power consumption in a device that transmitted the message by deactivating one or more functional components in the device.

12. The method of claim 11, wherein:

deactivating one or more functional components comprises at least deactivating a receiver in the device to postpone monitoring for the response until the device emerges from the sleep mode; and

emerging from the sleep mode comprises at least activating the receiver in the device to monitor for the response.

13. The method of claim 1, wherein determining when the same frequency will reoccur in the frequency hopping sequence comprises calculating a time duration, based on at least a quantity of frequencies in the frequency hopping sequence, an order of the frequencies in the frequency hopping sequence, and a time slot duration in which each of the frequencies is active, until the same frequency arises.

14. An apparatus comprising:

a receiver;

a transmitter configured to transmit a message via a frequency;

a timer module configured to determine when the frequency will occur in a frequency hopping sequence;

a sleep control module configured to cause at least the receiver to enter a sleep mode, and to cause the receiver to emerge from the sleep mode when the timer module indicates that the frequency has occurred in the frequency hopping sequence; and

wherein the receiver is configured to monitor for a response to the message via the frequency at which the message was transmitted when the receiver has emerged from the sleep mode.

15. The apparatus as in claim 14, wherein the timer module is further configured to determine a duration for which the frequency will be active in the frequency hopping sequence, and if no response to the message was received during the duration, to notify the sleep control module to cause at least the receiver to reenter the sleep mode until the timer module again indicates that the frequency has reoccurred in the frequency hopping sequence.

16. The apparatus as in claim 15, wherein the receiver is further configured to monitor for the response to the message via a frequency subsequent to the frequency in the frequency hopping sequence at which the message was transmitted, at the time the frequency at which the message was transmitted occurs in the frequency hopping sequence.

17. The apparatus as in claim 14, further comprising an acknowledge module configured to recognize acknowledgement signals received from a target device via the receiver in response to successful transmission of the message to the target device.

18. The apparatus as in claim 17, further comprising a retry module coupled to the acknowledge module to receive an indication of non-receipt of the acknowledgement signals, and configured to effect a retransmission of the message via the frequency used to originally send the message.

19. The apparatus as in claim 17, further comprising a retry module coupled to the acknowledge module to receive an indication of non-receipt of the acknowledgement signals, and configured to effect a retransmission of the message via a second frequency following the frequency in a transmitter frequency hopping sequence.

20. The apparatus as in claim 14, further comprising an acknowledge module configured to formulate an acknowledgement message for transmission to a target device that provided the response to the message.

21. A system comprising:

at least one target device comprising a receive timing module configured to identify an active frequency in a shared frequency hopping sequence in which to monitor for incoming messages;

at least one initiating device comprising;

a receiver;

a transmitter configured to transmit a response-evoking message to the at least one target device via a frequency;

a timer module configured to determine when the frequency will occur in the shared frequency hopping sequence;

a sleep control module configured to cause at least the receiver to enter a sleep mode, and to cause the receiver to emerge from the sleep mode when the timer module indicates that the frequency has occurred in the shared frequency hopping sequence; and

wherein the receiver is configured to monitor for a response to the response-evoking message from the at least one target device via the frequency when the receiver has emerged from the sleep mode.

22. The system of claim 21, wherein the at least one target device further comprises a response creation module configured to formulate the response in response to receiving the response-evoking message from the at least one initiating device.