Collision Avoidance for Radio Frequency Identification Tags: Simulation and Testing

Tag collisions are a common and significant obstacle in radio frequency identification (RFID) systems, directly affecting the identification efficiency and system throughput. To address this issue, this paper proposes a dynamic frame slotted RFID collision avoidance algorithm based on multiple frequencies. The proposed algorithm organizes tags into groups, limits the number of tags responding within each group, and dynamically adjusts the frame length to optimize management within the group. By efficiently allocating tags with different frequencies within the group, the proposed algorithm effectively reduces collision slots and increases system throughput per unit of time. Simulation and practical test results demonstrate that, compared to traditional RFID collision avoidance algorithms, the proposed algorithm shows significant advantages in improving throughput and reducing the number of collisions. It can be applied to practical RFID systems in high-density tag scenarios.