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Voice-over-IP (VoIP) has rapidly gained popularity in the last years, especially on smartphones platforms. In fact, WLAN chip-sets are becoming more common on smartphones, allowing users to use VoIP services from their mobile devices. On the other hand, the excessive energy consumption of the WLAN chip-set, limits the widespread use of VoIP on mobile phones. As most of the energy is spent when the WLAN is in idle mode waiting for a call, a possible solution is to use a secondary air interface, with lower energy consumption, as a signaling channel to wake up the WLAN radio. In this paper, the authors describe two approaches to address this problem, namely the overlay and cooperative approaches.
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