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As the need for asset and human resource management in specific fields such as institutes, museums and hospitals increases, many indoor tracking systems have been introduced. Systems based on active RFID are especially becoming more pervasive because of RFID's effectiveness. Under this circumstance, the collision problem of wireless communication, as in other communications systems, is a critical issue with regard to throughput and power consumption. Although there are already plenty of algorithms which effectively work both in Wifi and passive type RFID systems, there is no specific algorithm for this practical indoor tracking system. Active RFID systems respectively have their own characteristics that could be considered in designing the collision avoidance algorithm. In this paper, regarding the key aspects of the indoor tracking systems based on active RFID, the defects of conventional anti collision algorithms are analyzed and a dedicated collision avoidance algorithm is introduced.
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