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In recent years, there has been an increasing demand for ubiquitous streaming like applications in data networks. In this paper, the authors concentrate on NUM-based rate allocation for streaming applications with the so-called S-curve utility functions. Due to non-concavity of such utility functions, the underlying NUM problem would be non-convex for which dual methods might become quite useless. To tackle the non-convex problem, using elementary techniques they make the utility of the network concave, however this results in reverse-convex constraints which make the problem non-convex.
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