Patent ID: 7626503
Filing Date: 2009-12-01
Classification: G06K

Abstract:
1. A tag identification method in RFID systems including a reader and a plurality of tags, the method comprising the steps of: (a) transmitting an inquiry of (n−1) bits to each tag at the reader; (b) deciding whether the inquiry of (n−1) bits are identical with first (n−1) bits of each tag ID when receiving the inquiry of (n−1) bits at each tag within a readable range of the reader; (c) transmitting each tag ID by one bit from (n+1) (d) at the reader, checking whether there is a collision among the tag IDs received from the tags and identifying each tag ID of the tags based on the check result, wherein, if it is determined that there is a collision in step (d), the method further comprises: detecting whether the bit where the collision occurred is the last bit of each tag ID of the tags; and if the bit is the last bit of the tag ID, identifying two tags having tag IDs that are the connection of the reader's inquiry and the first value or the second value.