NIAP: A Neighbor Information based Multichannel RFID Reader Anti-collision Protocol

Reader collisions may occur when readers interrogate tags simultaneously due to mutual interference in Radio Frequency IDentification (RFID) systems. Many state-of-the-art protocols are devoted to eliminate reader collisions to pursue high throughput. This paper proposes a Neighbor Information based multichannel RFID reader Anti-collision Protocol (NIAP). In terms of competition strategy, the competition priority of a reader is determined by its number of neighbor readers based on the solving maximum independent sets algorithm. With regard to channel switching strategy, a reader which wants to switch to a new channel judges the severity of the reader-to-tag collisions according to the distance from the interrogating neighbor reader. Eligible reader-to-tag collisions are allowed to occur considering the coverage of readers. The simulation results show the proposed NIAP outperforms the other multichannel protocols.