Methods and apparatus for identifying as set location in communication networks
First Claim
1. A method for providing location identification information, said location information corresponding to a location of a mobile asset in a communication network, said method comprising:
- waiting a predetermined period of time;
detecting the presence of radio frequency energy on a first channel; and
if said radio frequency energy is substantially less than a predetermined threshold, transmitting said location identification information.
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Accused Products
Abstract
The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with signal decoders to time-stamp communication sequences. Cellular wireless networks may be frequency-multiplexed to increase spatial time-stamping density. Tags may be attached to passive assets to provide location identification information to network devices. Locations of assets broadcasting standard 802.11 radio frequency structures may be identified. Noise inherent in correlating a communication sequence may be reduced by using a selected correlation function.
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Citations
23 Claims
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1. A method for providing location identification information, said location information corresponding to a location of a mobile asset in a communication network, said method comprising:
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waiting a predetermined period of time;
detecting the presence of radio frequency energy on a first channel; and
if said radio frequency energy is substantially less than a predetermined threshold, transmitting said location identification information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for providing location identification information, said location information corresponding to a location of a mobile asset in a communication network, said method comprising:
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receiving a wake-up signal from a transmitter in said network; and
transmitting said location identification information. - View Dependent Claims (12, 14, 16, 17, 18, 19, 20, 21, 22, 23)
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13. The method of 11 wherein said transmitting comprises transmitting asset identification information.
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15. A system for providing location identification information, said location information corresponding to a location of a mobile asset in a communication network, said system comprising:
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means for delaying a predetermined period of time;
means for detecting radio frequency energy on a first channel; and
means for transmitting said location identification information on said first channel.
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Specification