RFID simulation tools

hello friend,
any one tell me tool for rfid simulation.please anyone give a dataset supply chain management .it will beuseful for my project?.please help me as soon as possible

What do you want to simulate? The antenna, the chip, or the a whole RFID environment?
Additionally what is your working frequency?

i need whole rfid environment in simulation.i want any sample dataset for supply-chain management.i would like to take 10 cases each case should have 5 iteams each.i would like to prefer passive tag . i need how to perform this simulation and which simulation tool is good?.i want sample dataset for the application supply-chain management.reader should be any frequency.please i want solution as soon as possible.