Method of grouping RF transponders
DCFirst Claim
Patent Images
1. A method for communicating between a base station and a set of radio frequency (RF) transponders (tags), comprising;
- selecting a plurality of groups of tags from the set of RF tags, the selection according to a physical attribute of the response of the tags to a first RF signal sent from the base station; and
communicating with tags in each group.
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Abstract
A method of selecting groups of radio frequency RF transponders (tags) for communication between a base station and the tags. The tags are selected into groups according to a physical attribute ofthe signal sent by the tags to the base station, or according to the physical response of the tags to a physical attribute of the signal sent from the base station to the tags. Communication with the tags is thereby simplified, and the time taken to communicate with the first tag is markedly reduced.
269 Citations
28 Claims
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1. A method for communicating between a base station and a set of radio frequency (RF) transponders (tags), comprising;
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selecting a plurality of groups of tags from the set of RF tags, the selection according to a physical attribute of the response of the tags to a first RF signal sent from the base station; and communicating with tags in each group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for communicating between a base station and a set of radio frequency (RF) transponders (tags), comprising;
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selecting a plurality of groups oftags from the set of RF tags, the selection according to a physical attribute of the response of the tags to a polarization of a first RF signal sent from the base station; and communicating with the tags in each group.
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25. A method for communication between a base station and a set of RF tags, comprising;
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I) transmitting a carrier wave with a first modulated signal to a base station antenna, the first modulated signal instructing the set of tags to return a second modulated signal in a time period (slot) defined by a tag communication protocol;
thenII) transmitting a carrier wave with a steady amplitude modulation to the base station antenna, the steady amplitude modulation being less than an amplitude modulation required to communicate with the set of tags; and III) measuring a modulation of a carrier wave received from the base station antenna, A) when the modulation of the carrier wave received from the base station antenna is steady, reducing the amplitude of the modulation of the carrier wave with a steady amplitude modulation and returning to step I); B) when the modulation of the carrier wave received from the base station antenna is not steady, and a) when the modulation can be read, communicating with a first tag and then instructing the first tag to cease sending modulated signals, then reducing the amplitude of the modulation of the carrier wave with a steady amplitude modulation and returning to step I); b) when the modulation can not be read, and i.) when the modulation of the carrier wave received from the base station antenna outside the communication protocol time slot is steady, communicating with multiple tags using a multiple tag communication protocol, then instructing the multiple tags to cease returning the second modulated signal,reducing the amplitude of the modulation of the carrier wave with a steady amplitude modulation and returning to step I); ii.) when the modulation of the carrier wave received from the base station antenna outside the communication protocol time slot is not steady, stopping.
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26. A method for communication between a base station and a set of RF tags, comprising;
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a) transmitting a first modulated signal to a base station antenna, the first modulated signal instructing the set of tags to return a second modulated signal in a time period (slot) defined by a tag communication protocol;
thenb) transmitting an unmodulated first carrier wave having a defined first phase to the base station antenna during the time slot defined by a tag communication protocol;
thenc) measuring a second modulated signal of a second carrier wave returned by the tags to the base station antenna in the time slot defined by the tag communication protocol, the second carrier wave having a second defined phase with respect to the first phase of the first carrier wave, and communicating with a first group of tags producing the modulated second carrier wave; and d) measuring a third modulated signal of a third carrier wave returned by the tags to the base station antenna in the time slot defined by the tag communication protocol, the third carrier wave having a third defined phase with respect to the first phase of the first carrier wave, and communicating with a second group of tags producing the modulated third carrier wave. - View Dependent Claims (27, 28)
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Specification