Radio frequency identification reader, radio frequency identification tag, and system and method for identifying tag using bit synchronizing signal

An RFID tag using a bit synchronizing signal, comprising:

• a tag communication unit for receiving a transmission request signal for tag data including a random number generation limit, the bit synchronizing signal, and the number of non-collision bits from an outer RFID reader;
• a random generation unit which generates a random bit and a random number within the random number generation limit if the transmission request signal is received;
• a bit synchronizing signal count unit which counts the received bit synchronizing signal;
• and
• a tag control unit which controls transmission of a response signal through the generated random bit if the counted bit synchronizing signal coincides with the generated random number, and transmit the tag data if the number of non-collision bits coincides with the random number.

A method for identifying a tag using a bit synchronizing signal in an RFID system that includes a tag and a reader, the method comprising:

• transmitting the bit synchronizing signal and a transmission request signal for tag data including a random number generation limit from the reader to the tag;
• generating a random bit and a random number within the random number generation limit through the tag;
• counting the bit synchronizing signal through the tag to transmit a response signal to the reader through the random bit if the counted bit synchronizing signal coincides with the generated random number;
• counting the response signal through the reader to transmit the number of non-collision bits having one response signal to the tag depending on the count result;
• and
• receiving the number of non-collision bits through the tag to transmit the tag data to the reader if the number of non-collision bits coincides with the random number.