ZONE-BASED COMMAND TRANSMISSIONS TO CART WHEEL ASSEMBLIES
3 Assignments
0 Petitions
Accused Products
Abstract
A vehicle tracking system includes a wheel assembly containing sensor circuitry capable of sensing various types of conditions, such as specific electromagnetic and/or magnetic signals indicative of particular wheel locations. The sensor circuitry is coupled to an RF transceiver, which may but need not be included within the wheel. The wheel may also include a brake mechanism. In one embodiment, the wheels are placed on shopping carts and are used to collect and monitor shopping cart status and location data via a wireless network. In some embodiments, the wheel assemblies detect that they have entered into particular zones by measuring received signal strengths of received command transmissions, and by comparing these measurements to thresholds that are used to define zone boundaries.
24 Citations
44 Claims
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1-20. -20. (canceled)
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21. A system for controlling usage of human-propelled carts, comprising:
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a wheel assembly that attaches to a human-propelled cart, said wheel assembly comprising a wheel and communication circuitry; and a device that transmits a command via radio frequency transmissions from an antenna, said device positioned at a fixed location to create a zone into which the cart can enter; wherein the communication circuitry is responsive to receiving a radio frequency transmission of the command from the device by measuring a received signal strength of the transmission and by determining whether the measured received signal strength satisfies a threshold for responding to the command, wherein the communication circuitry is configured to respond to the command when the threshold is satisfied and to disregard the command when the threshold is not satisfied, said threshold thereby defining a boundary of the zone. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method performed by a cart wheel assembly that comprises wireless communication circuitry, said cart wheel assembly attached to a human-propelled cart, the method comprising:
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receiving, with the wireless communication circuitry, a wireless transmission of a command from an antenna mounted at a fixed location; generating a received signal strength value representing a strength of the received wireless transmission of the command; and determining, based at least in part on the received signal strength value, whether to respond to the command. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A wheel assembly for a human-propelled cart, the wheel assembly comprising:
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a wheel; and a radio frequency transceiver unit configured to communicate on a wireless network, said radio frequency transceiver unit configured to receive a transmission on the wireless network of a command, and to determine whether to respond to the command at least in part by generating a received signal strength value representing a strength of the of the received transmission and by comparing the received signal strength value to a threshold. - View Dependent Claims (41, 42, 43, 44)
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Specification