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The authors consider the problem of providing ubiquitous yet affordable Internet connectivity to devices at home, at work, and on the move. In this context, they take advantage of two significant technology trends: the commoditization of WiFi WLAN technology and the rapid growth of cellular data services. They propose an architecture called Cool-Tether that harnesses the cellular radio links of one or more mobile smartphones in the vicinity, builds a WiFi hotspot on-the-fly, and provides energy-efficient, affordable connectivity. Prior approaches to supporting such a tethered mode operation have relied on the WiFi ad hoc mode, which impedes the key goal of conserving battery energy on mobile phones.
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