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The development of portable, light weight, hand held computing devices and high speed wireless local area networks enable user to remain connected while moving in indoor and outdoor environment. Wireless local area network has a wide range of utilization in moving from one location to another location. When a user is moving from one location to another, how the other user knows about the required station inside WLAN, for that we designed and implemented a system to locate a mobile user inside the wireless local area network based on RSSI. We designed four different architectures and used dynamic radio mapping of indoor and outdoor locations. These architectures are based on dynamic configuration of radio map in indoor and outdoor environment with the help of Sniffer, a specially designed application to locate a station at that time. We found a better location of a mobile user in WLAN with the help of Pamvotis a WLAN simulator. We tested this work in indoor and outdoor environment with different locations practically.