  Both GPS and WiFi based localization have been exploited in recent years, yet
most researches focus on localizing at home without environment context.
Besides, the near home or workplace area is complex and has little attention in
smart home or IOT. Therefore, after exploring the realistic route in and out of
building, we conducted a time localization system (TLS) based on off-the-shelf
smart phones with WiFi identification. TLS can identify the received signal
strength indication (RSSI) of home and construct radio map of users' time route
without site survey. As designed to service the smart devices in home, TLS
applies the time interval as the distance of positions and as the variables of
WiFi environment to mark time points. Experimental results with real users show
that TLS as a service system for timeline localization achieves a median
accuracy of 70 seconds and is more robust compared with nearest neighbor
localization approach.
