Wireless LANs not only provide an effective means of communication, but also allow to detect movement and immobility of a mobile node. This information can, for example, be employed by Wireless LAN positioning systems to reduce the lag of location estimates due to sample filtering. In addition, motion detection has many applications in context-aware computing. This paper proposes a simple scheme to reliably detect node movement based on received signal strength samples from one or more access points. The scheme is evaluated through extensive experiments in an office environment.
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