Patent ID: 8477016

Claim:
A Radio Frequency Identification (RFID) system limited to the use of a binary tree-based tag identification protocol for enabling an RFID reader to identify all RFID tags through continuous communication between the RFID tags and the RFID reader, comprising: when a period, in which the RFID tags each send a signal, including an ID, to the RFID reader and the RFID reader sends feedback, is defined as a time slot, the RFID reader for sending one piece of information selected from among collision type information, indicating that signals from the RFID tags collide with each other; idle type information, indicating that there are no signals from the RFID tags; and readable type information, indicating that a signal has been received from a single RFID tag and the corresponding RFID tag has been identified, to all of the RFID tags within an identification range of the RFID reader, as type information of a specific time slot, depending on the number of signals sent from the RFID tags in the corresponding time slot; and the RFID tags for performing functions, in which, when information, indicating that a current time slot is a collision type, is fed back from the RFID reader, each of RFID tags that caused a collision selects one arbitrary value of either 0 or 1 and is assigned a time slot, in which a corresponding RFID tag will send a signal to the RFID reader, based on the selected value, a single tag group that caused a collision is divided into two sub-groups depending on the assigned time slots, and tags of the sub-groups send signals, including IDs thereof, to the RFID reader in different time slots for the respective sub-groups such that all of the RFID tags send signals in different time slots of a single tag identification frame wherein the RFID reader can identify all of the RFID tags from the signals in different time slots.