Research on UHF RFID Anti-collision Algorithm Based on Collision Slots

The problem of anti-collision is an important research topic in UHF RFID system. In order to further improve the recognition efficiency of RFID system, a new anti-collision algorithm based on collision slots elimination is proposed. The algorithm sends a new command through the reader to filter the tags of the collision slot one by one, making the tags in the collision slot further identified, that can avoid tags in the collision slot to enter the next frame recognition. Because the tags of collision slot are identified, the number of frame slots is reduced, and the coordination time in the recognition process is saved. Finally, the theoretical analysis and simulation results show that the new algorithm, based on the ISO 18000-6C protocol, reduces the recognition time by about 25% and improves the recognition rate by about 27% compared with the 18000-6C protocol.