APPARATUS FOR DETERMINING TIME SLOT COUNT IN RFID SYSTEM AND METHOD AND SYSTEM FOR TAG RECOGNIZING USING THIS

摘要

An apparatus for determining the number of time slots in an RFID system, and a method and a system for recognizing a tag by using the same are provided to generate a random number in an RFID reader to determine a Q value and generate a random number by using a tag ID as a seed value in a tag, thereby shortening a tag recognition time and increasing probability to determine different time slot locations in at least one tag. An RFID(Radio Frequency Identification) system includes an RFID reader(110) and a tag(120). The RFID reader determines a Q value by using a reader random-number generator(112). The reader random-number generator sets the seed value of a rand() function by using a reader ID stored in the internal memory of the RFID reader as a factor of a srand() function. The random-number generation range of the rand() function is limited in a range of 0 to 2Q-1. The Q value is 0 to 15. The tag generates 2Q-1 time slots if the Q value is received from the RFID reader, and determines the location of a time slot to respond to the RFID reader.