RFID queries—multiple category
This chapter studies the problem of TKQs in multicategory RFID systems and makes three key contributions. First, we propose a TKQ protocol. The key idea is to use the combined signals in homogeneous slots to estimate category sizes. TKQ can quickly eliminate the sufficiently small categories, and only a limited number of large-size categories need accurate estimation. Second, we propose the SPH scheme to improve the frame utilization of TKQ from 36.8% to nearly 100%. We theoretically maximize the time efficiency of the proposed protocols. Third, we conduct extensive simulations to evaluate the protocol performance. The simulation results show that TKQ+SPH achieves not only the required accuracy constraints but also a 2.6-7× speedup over prior protocols.
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