This paper proposes a tree-based anti-collision protocol for tags in the UHF (ultra high frequency, 300MHz-3GHz) band. To reduce the step for searching all tags in the interrogation zone, the depth-first search (DFS) is used as a basic search criterion like in query tree protocols. To prevent the redundant increase of the transmission bit length in process of implementing the DFS, the binary tree protocol is taken to restart the DFS at the height of binary tree, rather than the root, that was most recently marked when the tag collision happened. To substantiate theoretically that the proposed protocol achieves better performance than the previous protocols, the performance index in [8] consisting of both energy consumption and time delay is employed.
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