Power management system and method for vehicle locating unit
First Claim
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1. A vehicle locating unit with improved power management, the vehicle locating unit comprising:
- a receiver for receiving an intermittent transmission from a communications source and having an assigned message frame, each transmission including at least one message frame having a data field and at least one auxiliary field; and
a power management system responsive to said receiver and configured to perform the following sequential steps;
(i) enter a wake mode corresponding to an expected start of the intermittent transmission,(ii) enter a sleep mode until a start of a next intermittent transmission if the expected start of the intermittent transmission is not detected;
otherwise, after detecting the expected start of the intermittent transmission, re-enter sleep mode and index to the receiver'"'"'s assigned message frame in the intermittent transmission,(iii) re-enter the wake mode after indexing,(iv) match a pattern of bits of the at least one auxiliary field of the indexed message frame with a plurality of stored patterns of bits, each pattern of bits corresponding to a command to the vehicle locating unit, and(v) return to the sleep mode if a mismatch is detected.
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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
11 Claims
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1. A vehicle locating unit with improved power management, the vehicle locating unit comprising:
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a receiver for receiving an intermittent transmission from a communications source and having an assigned message frame, each transmission including at least one message frame having a data field and at least one auxiliary field; and a power management system responsive to said receiver and configured to perform the following sequential steps; (i) enter a wake mode corresponding to an expected start of the intermittent transmission, (ii) enter a sleep mode until a start of a next intermittent transmission if the expected start of the intermittent transmission is not detected;
otherwise, after detecting the expected start of the intermittent transmission, re-enter sleep mode and index to the receiver'"'"'s assigned message frame in the intermittent transmission,(iii) re-enter the wake mode after indexing, (iv) match a pattern of bits of the at least one auxiliary field of the indexed message frame with a plurality of stored patterns of bits, each pattern of bits corresponding to a command to the vehicle locating unit, and (v) return to the sleep mode if a mismatch is detected. - View Dependent Claims (2, 3, 4, 5, 9, 10, 11)
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6. An improved method of power management for a vehicle locating unit having a receiver, the method comprising:
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assigning a message frame to the receiver; receiving an intermittent 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 corresponding to an expected start of the intermittent transmission; entering a sleep mode until a start of a next intermittent transmission if the expected start of the intermittent transmission is not detected;
otherwise, after detecting the expected start of the intermittent transmission, re-entering sleep mode and indexing to the receiver'"'"'s assigned message frame in the intermittent transmission;reentering the wake mode after indexing to the assigned message frame in the intermittent transmission; matching a pattern of bits of the at least one auxiliary field of the indexed frame with a plurality of stored patterns of bits, each pattern corresponding to a command to the vehicle locating unit; and returning to the sleep mode if a mismatch is detected. - View Dependent Claims (7, 8)
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Specification