Dynamic Frame Sizing with Grouping Slotted Aloha for UHF RFID Networks

Tag collision in a Radio Frequency IDentification system (RFID) is an important parameter that affects the overall system performance. Different algorithms have been proposed to efficiently utilize the slots during data transmission between reader and tags that need to be identified. Dynamic Frame slotted Aloha is a widely used anti collision algorithm that can be further divided into two main categories depending upon how the frame selection is performed. In this paper, the proposed algorithm modifies the mechanism used for dynamic grouping as implemented in the EPC global class 1 generation 2 algorithm and results have been presented showing improvement in the number of slots utilization and iterations required to successfully detect different number of tags.