Method and system for networking radio tags in a radio frequency identification system
DCFirst Claim
Patent Images
1. A method, comprising:
- receiving, by a receiver of a radio tag, a first signal including a data content on a first frequency, the data content identifying, based on an address, a first device that is separate from the radio tag, wherein the first device transmitted the first signal;
determining if the first signal further includes a wakeup signal signature, wherein the wakeup signal signature is a digital bit stream;
transitioning when the first signal is determined to include the wakeup signal signature, a processor of the radio tag from a first power operation mode to a second power operation mode to further process the first signal; and
transmitting, by a transmitter of the radio tag, a second signal on a second frequency to a second device, the second signal being transmitted by the transmitter in response to the receiver receiving the first signal, the second signal including the address identifying the first device.
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Abstract
A radio frequency tag for a radio frequency identification system is provided that includes an antenna and a receiver coupled to the antenna. The receiver receives and demodulates a message received on at least one frequency. A retransmit controller receives the message, determines a retransmit status for the message, and if the retransmit status is positive, initiates retransmission of the message for reception by another radio tag.
16 Citations
6 Claims
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1. A method, comprising:
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receiving, by a receiver of a radio tag, a first signal including a data content on a first frequency, the data content identifying, based on an address, a first device that is separate from the radio tag, wherein the first device transmitted the first signal; determining if the first signal further includes a wakeup signal signature, wherein the wakeup signal signature is a digital bit stream; transitioning when the first signal is determined to include the wakeup signal signature, a processor of the radio tag from a first power operation mode to a second power operation mode to further process the first signal; and transmitting, by a transmitter of the radio tag, a second signal on a second frequency to a second device, the second signal being transmitted by the transmitter in response to the receiver receiving the first signal, the second signal including the address identifying the first device. - View Dependent Claims (2, 3, 4, 5)
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6. A self-contained radio frequency identification tag configured to be attached to an object to be tracked, the tag comprising:
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a receiver operable to receive a first signal on a first frequency transmitted from a first device, the first signal including data identifying, based on an address, the first device and further including a wakeup signal signature, wherein the wakeup signal signature is a digital bit stream; a detector circuit to detect the wakeup signal signature in the first signal and outputting a data pulse in response to the detection of the wakeup signal signature; a processor that transitions from a first power operation mode to a second power operation mode for a predetermined period of time when receiving the data pulse from the detector circuit; and a transmitter operable to transmit a second signal on a second frequency to a second device, the second signal being transmitted by the transmitter in response to the receiver receiving the first signal, the second signal including the data identifying the first device.
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Specification