Patent ID: 8040829

Claim:
A system for performing radio frequency communications, the system comprising: a radio frequency identification (RFID) tag attached to one or more items to be tracked, the RFID tag generating a first random number and a second random number, the RFID tag configured to communicate a response including at least one of the first random number and the second random number at a time based at least in part on the second random number upon receipt of a request identifying a subgroup that includes the first random number; one or more antennas positioned in a first region; and an interrogator communicatively coupled to the one or more antennas to transmit one or more requests and to receive one or more responses, the interrogator being configured to repeatedly define a subgroup of possible random numbers such that each subgroup is a subset of a previous subgroup and to transmit requests for RFID tags having a random number within the subgroup until the interrogator receives the response from the RFID tag without a collision.