Radio Frequency Identification (RFID) systems have been introduced since World War ??. But the basic principles for the technology have changed little. Recently this technology is being used for many applications like traffic, inventory control and tagging articles. This technology can be a very good replacement for traditional bar code. An RFID system is composed of readers and tags. Information is stored inside the tags and readers read this information by different algorithms. By considering the growth of this technology and its application in different areas and using many readers simultaneously, collision may occur between readers. To solve this problem, various methods have been proposed with advantages and disadvantages. For example Colorwave solves collision problem using time division and avoiding readers to work simultaneously. HiQ algorithm controls the collision by using a central controller and learning algorithm. In this thesis a new method using RTS/CTS mechanism used in 802.11 standard is proposed. For RFID networks RTS/CTS is modified a little and directive antenna is used for both readers and tags. Finally different scenarios are simulated and higher speed and throughput are observed.
