A Reliable Data Capture in Multi-RFID Reader Environments

Reliable RFID identification is one of issues in RFID applications in recent. However, the RFID reader has difficulty to obtain reliable data in data capture layer. The reason is that unreliable readings such as a false positive reading and a false negative reading and missed readings can happen by reader collision problems, noise, or the mobility of tagged objects. We introduce performance metrics to solve these reader problems. We propose three solutions: 1) the minimum overlapped read zone (MORZ) with received signal strength indicator (RSSI), 2) the spatial-temporal division access (STDA) method, and 3) double bigger size of tags attached on the object. To show the improvement of the proposed methods, we calculate tag´s successful read rates in a smart office, which consists of multi-RFID reader systems.