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Mobile devices are increasingly being relied on for tasks that go beyond simple connectivity and demand more complex processing. The primary approach in wide use today uses cloud computing resources to off-load the "Heavy lifting" to specially designated servers when they are well connected. In reality, a mobile device often encounters, albeit intermittently, many entities capable of lending computational resources. In this paper, the authors first give an overview of this environment, which they call a Cirrus Cloud due to its intermittent connectivity feature, and explain how it provides a spectrum of computational contexts for remote computation in a mobile environment. An ultimately successful system will need to have the flexibility to handle intermittent connectivity and use a mix of options on that spectrum.
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