Power management system and method for vehicle locating unit
First Claim
1. A power management system for a vehicle locating unit, the vehicle locating unit having a receiver for receiving at an assigned message frame an intermittent transmission from a communications source, wherein each intermittent transmission includes at least one assignable message frame, the power management system comprising:
- a processing device for controlling wake and sleep modes of the receiver; and
a memory for storing a plurality of memory bit patterns for comparison with a pattern of bits contained in some portion of an assigned message frame,wherein the processing device is configured to perform the following steps;
index to the receiver'"'"'s assigned message frame in the intermittent transmission;
re-enter wake mode after indexing; and
subject the receiver to a constant average current draw; and
wherein the vehicle locating unit further comprises a transmitter for transmitting reply code and each intermittent transmission includes at least one of an activate command, a de-activate command, and a speed-up command, wherein the processing device is further configured to perform the following steps;
upon receipt of an activate command, switch said transmitter from a de-activated state to a slow mode state;
switch said transmitter from the slow mode state to a slower, second slow mode state after a predetermined period; and
upon receipt of a speed-up command, switch said transmitter from at least one of the slow mode state and the second slow mode state to a fast mode state;
switch the transmitter from the fast mode state to the slow mode state after a predetermined period;
switch the transmitter from the second slow mode state to a slower, third slow mode state after a preselected period; and
switch said transmitter from the third slow mode state to the fast mode state upon receipt of a speed-up command.
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Accused Products
Abstract
Improved power management for a vehicle locating unit is achieved by receiving a transmission from a communication source, each transmission including at least one message frame having a data field and at least one auxiliary field; entering a wake mode upon indexing the assigned message frame of the receiver in the transmission; matching the pattern of bits of at least one auxiliary field of the indexed frame with one or more stored patterns of bits expected for that auxiliary field; and returning to the sleep mode as soon as a mismatch is determined or processing the message if no mismatch occurs.
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Citations
16 Claims
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1. A power management system for a vehicle locating unit, the vehicle locating unit having a receiver for receiving at an assigned message frame an intermittent transmission from a communications source, wherein each intermittent transmission includes at least one assignable message frame, the power management system comprising:
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a processing device for controlling wake and sleep modes of the receiver; and a memory for storing a plurality of memory bit patterns for comparison with a pattern of bits contained in some portion of an assigned message frame, wherein the processing device is configured to perform the following steps; index to the receiver'"'"'s assigned message frame in the intermittent transmission; re-enter wake mode after indexing; and subject the receiver to a constant average current draw; and wherein the vehicle locating unit further comprises a transmitter for transmitting reply code and each intermittent transmission includes at least one of an activate command, a de-activate command, and a speed-up command, wherein the processing device is further configured to perform the following steps; upon receipt of an activate command, switch said transmitter from a de-activated state to a slow mode state; switch said transmitter from the slow mode state to a slower, second slow mode state after a predetermined period; and upon receipt of a speed-up command, switch said transmitter from at least one of the slow mode state and the second slow mode state to a fast mode state; switch the transmitter from the fast mode state to the slow mode state after a predetermined period; switch the transmitter from the second slow mode state to a slower, third slow mode state after a preselected period; and switch said transmitter from the third slow mode state to the fast mode state upon receipt of a speed-up command. - View Dependent Claims (2, 3, 4, 5)
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6. A power management system for a vehicle locating unit, the vehicle locating unit having a receiver for receiving at an assigned message frame an intermittent transmission from a communications source and a transmitter for transmitting reply code, wherein each intermittent transmission includes at least one assignable message frame and at least one of an activate command, a de-activate command, and a speed-up command, the power management system comprising:
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a processing device for controlling wake and sleep modes of the receiver; and a memory for storing a plurality of memory bit patterns for comparison with a pattern of bits contained in some portion of an assigned message frame, wherein the processing device is configured to perform the following steps; index to the receiver'"'"'s assigned message frame in the intermittent transmission; re-enter wake mode after indexing; upon receipt of an activate command, switch the transmitter from a de-activated state to a slow mode state and switch the transmitter from the slow mode state to a slower, second slow mode state after a period of time; and upon receipt of a speed-up command, switch the transmitter from at least one of the slow mode state and the second slow mode state to a fast mode state and switch the transmitter from the fast mode state to the slow mode state after a period of time, wherein operation of the system subjects the receiver to a constant average current draw. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of power management for a vehicle locating unit, the vehicle locating unit having a receiver for receiving at an assigned message frame from a communications source an intermittent transmission and a transmitter for transmitting reply code, wherein each intermittent transmission includes at least one assignable message frame and at least one of an activate command, a de-activate command, and a speed-up command, a processing device for controlling wake and sleep modes of the receiver;
- and a memory for storing a plurality of memory bit patterns for comparison with a pattern of bits contained in some portion of an assigned message frame, the method comprising the receiver;
indexing to the receiver'"'"'s assigned message frame in the intermittent transmission; re-entering wake mode after indexing; upon receipt of an activate command, switch the transmitter from a de-activated state to a slow mode state and switch the transmitter from the slow mode state to a slower, second slow mode state after a period of time; upon receipt of a speed-up command, switch the transmitter from at least one of the slow mode state and the second slow mode state to a fast mode state and switch the transmitter from the fast mode state to the slow mode state after a period of time; and subjecting the receiver to a constant average current draw. - View Dependent Claims (13, 14, 15, 16)
- and a memory for storing a plurality of memory bit patterns for comparison with a pattern of bits contained in some portion of an assigned message frame, the method comprising the receiver;
Specification