Continuous Scanning with Mobile reader Estimate the tag density: an important factor on the performance metrics When the tag density cannot be pre-fetched or varies along the forwarding direction, it is essential to accurately estimate the current tag density, such that (pu, v") can be computed Challenges Due to the probabilistic backscattering, it is difficult to directly estimate the tag density Commercial RFid readers do not expose these low-level data to upper-layer applications It is essential to estimate the tag density in a more practical wayContinuous Scanning with Mobile Reader Estimate the tag density: an important factor on the performance metrics. • When the tag density cannot be pre-fetched or varies along the forwarding direction, it is essential to accurately estimate the current tag density, such that can be computed. • Challenges: – Due to the probabilistic backscattering, it is difficult to directly estimate the tag density. – Commercial RFID readers do not expose these low-level data to upper-layer applications. • It is essential to estimate the tag density in a more practical way