Patent ID: 9626619
Date: 2017-04-18
CPC Classifications: G06K,G06Q,H04J,H05K

Claim:
1. A radio frequency identification (RFID) interrogation system, comprising: multiple RFID interrogators, wherein each of the multiple RFID interrogators is configured to transmit a plurality of synchronization pulses to surrounding RFID tags, and wherein the multiple RFID interrogators includes a first RFID interrogator, the first RFID interrogator is configured to: transmit a synchronization to nearby RFID tags; while listening for RFID tag transmissions in response to the synchronization pulse, detect any interference from another RFID interrogator among the multiple RFID interrogators; and if an interference is detected from another RFID interrogator among the multiple RFID interrogators, determine if data is expected from a nearby RFID tag, and if interference is not detected from another RFID interrogator, wait for the expected data from the nearby RFID tag.