Method and system for networking radio tags in a radio frequency identification system
First Claim
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1. A radio frequency tag for a radio frequency identification system, comprising:
- an antenna system;
a one or more receivers coupled to the antenna system to receive and demodulate a messages on at least two frequencies; and
a retransmit controller operable to receive a message from the one or more receivers, identify the message as either an explicit or global message, determine a retransmit status for the message based on whether the message is explicit or global, and initiate retransmission of the message for reception by another radio frequency tag in response to a positive retransmit status for the message, the one or more receivers further comprising;
a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and
a second receiver coupled to the antenna system to receive and demodulate messages from a second unit type at a second disparate frequency.
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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.
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Citations
29 Claims
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1. A radio frequency tag for a radio frequency identification system, comprising:
- an antenna system;
a one or more receivers coupled to the antenna system to receive and demodulate a messages on at least two frequencies; and
a retransmit controller operable to receive a message from the one or more receivers, identify the message as either an explicit or global message, determine a retransmit status for the message based on whether the message is explicit or global, and initiate retransmission of the message for reception by another radio frequency tag in response to a positive retransmit status for the message, the one or more receivers further comprising;
a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and
a second receiver coupled to the antenna system to receive and demodulate messages from a second unit type at a second disparate frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- an antenna system;
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10. A radio frequency identification system, comprising:
- a base station operable to communicate messages with radio frequency tags within the operational range of the base station;
a plurality of radio frequency tags each comprising;
an antenna system;
a receiver coupled to the antenna to receive and demodulate messages from the base station and the other radio frequency tags on at least two frequencies; and
a retransmit controller operable to receive a messages from the one or more receivers, identify the message as either an explicit or global message, determine a retransmit status for each message based on whether the message is explicit or global, and initiate retransmission of the message within the operational range of the radio frequency tag in response to a positive retransmit status for the message, the one or more receivers further comprising;
a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and
a second receiver coupled to the antenna system to receive and demodulate messages from a second unit type at a second disparate frequency. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- a base station operable to communicate messages with radio frequency tags within the operational range of the base station;
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18. A method for communication between a base station and a plurality of radio frequency tags in a radio frequency identification system, comprising:
- transmitting a query message from the base station;
each of the radio frequency tags receiving the query message at one or more receivers operable to receive and demodulate query messages on at least two frequencies, identifying the query message as either an explicit or global message, determining a retransmit status for the query message based on whether the message is explicit or global, and retransmitting the query message in response to a positive retransmit status;
each radio frequency tag receiving the query message, determining a response status for the query message, and transmitting a response message for the base station in response to a positive response status; and
each radio frequency tag receiving a response message from another radio tag, determining a retransmit status for the response message, and retransmitting the response message in response to a positive retransmit status, the one or more receivers further comprising;
a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and
a second receiver coupled to the antenna system to receive and demodulate messages from a second unit type at a second disparate frequency. - View Dependent Claims (19, 20, 21)
- transmitting a query message from the base station;
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22. A method for processing a message in a network radio frequency tag, comprising:
- receiving a message at one or more receivers operable to receive and demodulate messages on at least two frequencies;
determining a response status for the message;
transmitting a response to the message in response to a positive response status;
identifying the message as either an explicit or global message;
determining a retransmit status for the message based on whether the message is explicit or global; and
retransmitting the message in response to a positive retransmit status, the one or more receivers further comprising;
a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and
a second receiver coupled to the antenna system to receive and demodulate messages from a second unit type at a second disparate frequency. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
- receiving a message at one or more receivers operable to receive and demodulate messages on at least two frequencies;
Specification