Method, apparatus and system for collecting tags using bit map in rfid system

An apparatus for collecting tags in a RFID, the apparatus comprising:

• a controller which generates a bit map indicating recognition statuses of tags within one scan period, repeatedly performs a scan process until recognizing all tags using the bit map, and controls to collect data from the recognized tags when all the tags are successfully recognized.

A system for collecting tags in a RFID, the system comprising:

• an apparatus for collecting the tags which generates a bit map indicating recognition statuses of tags within one scan period, repeatedly performs a scan process until recognizing all tags using the bit map, controls to collect data from the recognized tags when all the tags are successfully recognized;
• and
• a tag which transmits a tag response in a scan period, receives the bit map, determines whether the tag is successfully recognized to determine whether to transmit a tag response at a next scan period.