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Using mobile devices to access the network service over public transportation system provides ubiquitous network access. Accelerometer has become standard equipment in mobile handheld devices. The authors proposed a power saving mechanism, AAPS, which integrates accelerometer and Wi-Fi devices to facilitate opportunistic communication while conserving power. In the scenario of BS in the station and MS on the vehicle, MS would idle during the inter-station period and waste a lot of energy. AAPS enables the devices to detect the vibration caused by moving vehicle and stay in sleep mode until the vehicle approaches next station. When MS is approaching or in the stations, accelerometer will trigger the WLAN to connect to BS in the stations.
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