Quasi-Optimal Network Utility Maximization for Scalable Video Streaming
This paper addresses rate control for transmission of scalable video streams via Network Utility Maximization (NUM) formulation. Due to stringent QoS requirements of video streams and specific characterization of utility experienced by end-users, NUM formulation for these streams is nonconvex and even nonsmooth, hence making dual methods often incompetent to solve them. Convexity plays an important role in this work as it permits the use of existing dual methods to solve NUM problem iteratively and distributively. Hence, to tackle the nonsmoothness and nonconvexity, the authors aim at reformulating the NUM problem by employing a series of approximation and transformation of the ideal discretely adaptive utility functions for scalable video streams.