Downlink Power Allocation for Stored Variable-Bit-Rate Videos

Details Downlink Power Allocation for Stored Variable-Bit-Rate Videos Downlink Power Allocation for Stored Variable-Bit-Rate Videos

2011-05-03

arxiv.org/abs/1105.0476v1

Computer Science

Information Theory

Scientific paper

In this paper, we study the problem of power allocation for streaming multiple variable-bit-rate (VBR) videos in the downlink of a cellular network. We consider a deterministic model for VBR video traffic and finite playout buffer at the mobile users. The objective is to derive the optimal downlink power allocation for the VBR video sessions, such that the video data can be delivered in a timely fashion without causing playout buffer overflow and underflow. The formulated problem is a nonlinear nonconvex optimization problem. We analyze the convexity conditions for the formulated problem and propose a two-step greedy approach to solve the problem. We also develop a distributed algorithm based on the dual decomposition technique. The performance of the proposed algorithms are validated with simulations using VBR video traces under realistic scenarios.

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