RFID estimation—impact of blocker tags
This chapter formally defines a new problem of RFID estimation with the presence of blocker tags and makes the first piece of effort that towards providing an efficient solution. The proposed RFID Estimation scheme with Blocker tags (REB) is compliant with the commodity EPC C1G2 standard, and does not require any modifications to off-the-shelf RFID tags. REB provides an unbiased functional estimator which can guarantee any degree of estimation accuracy specified by the users. Using REB, a retailer can monitor the product stock in a timely manner; meanwhile, the blocker tags are being used to protect the privacy of some important items. Rigorous analysis is given to optimize the parameters of REB to minimize its time cost and energy cost. A trade-off between the time cost and energy cost can be flexibly controlled to satisfy the practical requirements. Extensive simulation results has revealed the advantages of REB over prior schemes in terms of estimation accuracy, time efficiency, and energy efficiency.
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