Mobility

Energy-Delay Tradeoffs in Smartphone Applications

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Executive Summary

Many applications are enabled by the ability to capture videos on a smartphone and to have these videos uploaded to an Internet connected server. This capability requires the transfer of large volumes of data from the phone to the infrastructure. Smartphones have multiple wireless interfaces - 3G/EDGE and WiFi - for data transfer, but there is considerable variability in the availability and achievable data transfer rate for these networks. Moreover, the energy costs for transmitting a given amount of data on these wireless interfaces can differ by an order of magnitude. On the other hand, many of these applications are often naturally delay-tolerant, so that it is possible to delay data transfers until a lower-energy WiFi connection becomes available.

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