VARIABLE LISTEN DURATION AND/OR SYNCHRONIZED WAKE-UP OF ASSET TAGS
First Claim
1. A method of obtaining information for locating an asset, the method comprising:
- listening, at an asset tag, for a first listen duration for landmark messages;
receiving, at the asset tag during the first listen duration, at least one landmark message from each of one or more landmark tags;
selecting a synched landmark tag from the one or more landmark tags;
abstaining from listening, at the asset tag, for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and
waking up at approximately the subsequent transmission time of the synched landmark message to listen, at the asset tag, for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time;
wherein the first listen duration is longer than the second listen duration.
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Abstract
A method of obtaining information for locating an asset includes: listening, at an asset tag, for a first listen duration for landmark messages; receiving, at the asset tag during the first listen duration, at least one landmark message from each of one or more landmark tags; selecting a synched landmark tag from the one or more landmark tags; abstaining from listening, at the asset tag, for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and waking up at approximately the subsequent transmission time of the synched landmark message to listen, at the asset tag, for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time; wherein the first listen duration is longer than the second listen duration.
29 Citations
24 Claims
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1. A method of obtaining information for locating an asset, the method comprising:
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listening, at an asset tag, for a first listen duration for landmark messages; receiving, at the asset tag during the first listen duration, at least one landmark message from each of one or more landmark tags; selecting a synched landmark tag from the one or more landmark tags; abstaining from listening, at the asset tag, for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and waking up at approximately the subsequent transmission time of the synched landmark message to listen, at the asset tag, for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time; wherein the first listen duration is longer than the second listen duration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An asset tag comprising:
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a wireless communication module communicatively; a memory; and a processor, communicatively coupled to the wireless communication module and the memory, configured to; cause the wireless communication module to listen for a first listen duration for landmark messages; select a synched landmark tag from one or more landmark tags from each of which at least one landmark message is received during the first listen duration; cause the wireless communication module to abstain from listening for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and cause the wireless communication module to wake up at approximately the subsequent transmission time of the synched landmark message to listen for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time; wherein the first listen duration is longer than the second listen duration. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An asset tag comprising:
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wireless communication means for communicating with landmark tags; processor means, communicatively coupled to the wireless communication module and the memory, for; causing the wireless communication module to listen for a first listen duration for landmark messages; selecting a synched landmark tag from one or more landmark tags from each of which at least one landmark message is received during the first listen duration; causing the wireless communication module to abstain from listening for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and causing the wireless communication module to wake up at approximately the subsequent transmission time of the synched landmark message to listen for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time; wherein the first listen duration is longer than the second listen duration. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A processor-readable storage medium comprising processor-readable instructions configured to cause a processor to:
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cause a wireless communication module to listen for a first listen duration for landmark messages; select a synched landmark tag from one or more landmark tags from each of which at least one landmark message is received during the first listen duration; cause the wireless communication module to abstain from listening for landmark messages until approximately a subsequent transmission time of a synched landmark message corresponding to the synched landmark tag; and cause the wireless communication module to wake up at approximately the subsequent transmission time of the synched landmark message to listen for landmark messages for a second listen duration such that the asset tag listens for the landmark messages during the subsequent transmission time; wherein the first listen duration is longer than the second listen duration. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification