A capture-aware and blocking binary tree protocol for RFID tag identification

The capture effect is inevitable in the Radio frequency identification (RFID) system. In the capture environment, the reader may not fully recognize the tags within its scope. In many RFID applications, the reader identifies the tags in its range repeatedly; in these cases, the reader should recognize staying tags rapidly and spend the main time in identifying arriving tags. For these reasons, this paper presents a capture-aware and blocking binary tree protocol (CBBT). A CBBT reader can identify the tags in its range completely when the capture effect happens. CBBT not only prevents the collisions of staying tags but also inhibits staying tags from colliding with arriving tags. What's more, each staying tag only replies a very short response to the reader to be identified. Thus, staying tags can be identified quickly in CBBT. Simulation results show that CBBT outperforms the existing algorithm significantly.