Multi-protocol or multi-command RFID system
DCFirst Claim
1. An interrogation system for communicating with a plurality of transponders having different communication protocols, the interrogation system comprisinga plurality of interrogators anda synchronization signal,each of the interrogators comprisinga transmitter anda receiverthe transmitters being arranged for transmitting downlink signals in accordance with different communication protocols over a downlink communications link to the transponders,the receivers being arranged for receiving respective uplink signals over an uplink communications signal link from the transponders,the synchronization signal being arranged for synchronizing the downlink signals for each of the plurality of interrogators, each of the interrogators operating in response to the synchronization signal to simultaneously transmit the downlink signals to the transponders to enable the transponders to provide their respective uplink signals after the transmission of the downlink signals, thereby enabling communication between respective ones of the interrogators and transponders without interference between the uplink signals from the transponders and the downlink signals from the interrogators.
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Abstract
A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO™ RFID backscatter transponders, SEGO™ RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference.
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Citations
36 Claims
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1. An interrogation system for communicating with a plurality of transponders having different communication protocols, the interrogation system comprising
a plurality of interrogators and a synchronization signal, each of the interrogators comprising a transmitter and a receiver the transmitters being arranged for transmitting downlink signals in accordance with different communication protocols over a downlink communications link to the transponders, the receivers being arranged for receiving respective uplink signals over an uplink communications signal link from the transponders, the synchronization signal being arranged for synchronizing the downlink signals for each of the plurality of interrogators, each of the interrogators operating in response to the synchronization signal to simultaneously transmit the downlink signals to the transponders to enable the transponders to provide their respective uplink signals after the transmission of the downlink signals, thereby enabling communication between respective ones of the interrogators and transponders without interference between the uplink signals from the transponders and the downlink signals from the interrogators.
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15. An interrogation system for communicating with backscatter transponders using a communication protocol having different commands, the interrogation system comprising;
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a plurality of interrogators, and a synchronization signal, each of the interrogators comprising a transmitter and a receiver, the transmitters being arranged for transmitting downlink signals in accordance with different commands over a downlink communications link to the transponders, the receivers being arranged for receiving respective uplink signals over an uplink communications signal link from the transponders, the synchronization signal being arranged for synchronizing the downlink signals for each of the plurality of interrogators, each of the interrogators operating in response to the synchronization signal to simultaneously transmit the downlink signals to the transponders to enable the transponders to provide their respective uplink signals after the transmission of the downlink signals, thereby enabling communication between respective ones of the interrogators and transponders without interference between the uplink signals from the transponders and the downlink signals from the interrogators. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An interrogator capable of communicating with a first set of transponders and a second set of transponders, the first and second set of transponders having different power, depth of modulation, or duty cycles, the interrogator comprising:
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a transmitter for transmitting a first downlink signal to the first set of transponders and a second downlink signal to the second set of transponders; a receiver for receiving a first uplink signal from the first set of transponders and a second uplink signal from the second set of transponders; and
,a controller for controlling said transmitter to transmit the first and second downlink signals based on the power, depth of modulation, or duty cycle of the respective first and second sets of transponders, and for controlling said receiver to receive the first and second uplink signals based on the power, depth of modulation, or duty cycle of the respective first and second sets of transponders; wherein the interrogator operates in an environment with at least one additional like interrogator and all of the interrogators are responsive to a synchronization signal that enables the interrogators to simultaneously transmit downlink signals to the transponders to enable the transponders to provide their respective uplink signals after the transmission of the downlink signals, thereby enabling communication between respective ones of the interrogators and transponders without interference between the uplink signals from the transponders and the downlink signals from the interrogators. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification