PURPOSE: A tag collision preventing method in an RFID system is provided to transmit a response signal to a time slot and to enter a sleep mode, thereby minimizing power consumption of a tag. CONSTITUTION: When a tag receives a collection command from a reader, the tag generates a random number and enters into a collection sleep mode(S50). The tag transmits a response signal to the reader in a time slot and enters into a sleep mode(S80). The time slot is started by transmission of the response signal in the tag. The time slot is finished by entering the sleep mode. The collection sleep mode activates a timer in the tag. [Reference numerals] (AA) Start; (BB) No; (CC) Yes; (DD) End; (S10) Receiving a wake up command; (S20) Entering into an active mode; (S30) Receiving a collection command; (S40) Generating a random number N; (S50) Entering into a collection sleep mode; (S60) Transmitting a response signal by entering into the active mode when a predetermined time elapses; (S70) Receiving a sleep command; (S80) Entering into a sleep mode

Tag anti-collision method of rfid system

A device and a method for learning-based anti-collision in an RFID(Radio Frequency IDentification) system are provided to reduce collision when an RFID tag selects a slot for transmitting information after previous collision information is learned. An RFID reader(200) includes a reading and interpreting function. An RFID tag(100) selects a slot for transmitting ID information and data based on learned collision information of each slot when data is transmitted to the RFID reader by learning the collision information of each slot. The RFID tag includes a learning unit(300) storing the learned collision information of each slot. The RFID reader reads tag information over multiple rounds by using a plurality of slots. The round includes a request time for sending a reading command including the number of slots corresponding to the round from the RFID reader to the RFID tag, a frame time responding to the slot selected by a learning technique in the RFID tag, and a sleep time transmitting a sleep command from the RFID reader to the RFID tag read by the RFID reader. The response is one of a collision state, a read success state, and an empty state.

Apparatus and method for learning-based anti-collision in rfid systems

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Apparatus and method for learning-based anti-collision in rfid systems