Mitigating adjacent RFID reader interference
First Claim
1. A radio frequency identification (RFID) system with interference mitigation, the system comprising:
- a first RFID reader coupled to a first plurality of antennas and configured to transmit a first signal via a first antenna of the first plurality of antennas; and
a second RFID reader coupled to a second plurality of antennas different from the first plurality of antennas, and configured totransmit a second signal via a second antenna of the second plurality of antennas,receive an indication from the first RFID reader related to a transmission of the first signal, andinhibit transmission of the second signal via the second antenna of the second plurality of antennas if the indication indicates the first antenna is transmitting the first signal.
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Accused Products
Abstract
A radio frequency identification (RFID) automatic vehicle identification (AVI) system configured to mitigate signal interference, the system comprising a plurality of RFID readers, comprising a first RFID reader and a second RFID reader; and a plurality of antennas, wherein a first antenna is connected to the first RFID reader and a second antenna is connected to the second RFID reader. Prior to the first RFID reader transmitting a signal through the first antenna, the first RFID reader samples a received radio frequency (RF) signal from the first antenna, and if the received RF signal meets predetermined strength and frequency criteria, the first RFID reader inhibits transmission of the signal through the first antenna.
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Citations
20 Claims
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1. A radio frequency identification (RFID) system with interference mitigation, the system comprising:
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a first RFID reader coupled to a first plurality of antennas and configured to transmit a first signal via a first antenna of the first plurality of antennas; and a second RFID reader coupled to a second plurality of antennas different from the first plurality of antennas, and configured to transmit a second signal via a second antenna of the second plurality of antennas, receive an indication from the first RFID reader related to a transmission of the first signal, and inhibit transmission of the second signal via the second antenna of the second plurality of antennas if the indication indicates the first antenna is transmitting the first signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for interference mitigation in a radio frequency identification (RFID) system, the method comprising:
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transmitting, at a first RFID reader, a first signal via a first antenna of a first plurality of antennas coupled to the first RFID reader; receiving, at a second RFID reader, an indication related to a transmission of the first signal from the first RFID reader, the second RFID reader being coupled to a second plurality of antennas different from the first plurality of antennas and configured to transmit a second signal via a second antenna of the second plurality of antennas; and inhibiting, at the second RFID reader, transmission of the second signal via the second antenna of the second plurality of antennas if the indication indicates the first antenna is transmitting the first signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for interference mitigation in a radio frequency identification (RFID) system, the method comprising:
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transmitting, at a first RFID reader, a first signal during a first time period via a first antenna of a first plurality of antennas coupled to the first RFID reader; receiving, at the first RFID reader, an indication related to a transmission of a second signal by a second RFID reader during a second time period after the first time period, via a second antenna of a second plurality of antennas coupled to the second RFID reader, the second antenna having a transmission field overlapping with a transmission field of the first antenna; and inhibiting, at the first RFID reader, transmission via the first antenna during the second time period based on the receiving.
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Specification