A very fast tags polling protocol for single and multiple readers RFID systems, and its applications

In the protocol version for large, multireader RFID systems, we take an approach completely different from that used so far for any multireader protocol. Up to now, in the proposed protocols for this and related problems, first readers are scheduled so that those with overlapping ranges never operate at the same time. Then, single reader protocol for each so scheduled reader are applied. Here, we schedule the tags instead of the readers so that tags whose transmission can be received by a common reader, never operate at the same time. Then, we show that our polling protocol for single reader systems can be effectively used along with such a tags scheduling strategy, in multireader systems. The time performance improvement of our protocol over the known ones for multireader systems is very large, going from two to seven times, as shown by a simulation experiment we set up, and whose results are also presented.