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Location information is a critical element of ubiquitous computing. Cricket is an indoor location-based system that transmits radio and ultrasonic signals in regular intervals to calculate the distance between nodes. However, the amount of signal interference and collisions increases in proportion with the number of nodes, losing the accuracy of the location-based system. This study proposes an algorithm based on the 802.15.2 MAC protocol for the wireless sensor network to reduce signal interference and collision by employing node numbers and the frequency reuse approach used in mobile telecommunication. We analyzed the performance of our algorithm. The obtained results showed that the algorithm is an effective for throughput and energy compared to the Cricket system. Key Words : Indoor Location-based System, Wireless Sensor Network, IEEE 802.15.4 *  : (shhwang@kangwon.ac.kr) 11 12 22  12 01 04  12 01 05 1.        GPS(Global Positioning System)   , GPS               .              .    , , , UWB(Ultra WideBand)      ,             [1].  RF(Radio Frequency)            . 3    ,              (Active Bat)  MIT  (Cricket System) [2,3].      .  (Beacon)   (Listener) .   RF

RF and Ultrasonic Interference Reduction Technique in Indoor Location Sensing Systems