Joint High Level QP and Low Level Power Control in NOMA/OMA Downlink Wireless Multimedia Communications

Abstract

Improving Quality of Experience (QoE) of User Equipment (UE) in wireless multimedia services is a critical challenge. In this paper we study the joint design of high level dynamic video Quantization Parameter (QP) and the low level power control in QoE-driven downlink wireless multimedia services. Furthermore, we study QoE performance with new Non-Orthogonal Multiple Access (NOMA) schemes in the Base Station (BS) – UE multimedia downlink, and discuss the performance in comparison with conventional Orthogonal Multiple Access (OMA). We mathematically model UE’s QoE gain (also known as utility) by considering UE’s perceived data quality and the corresponding data cost. Then we show that there exists an optimal data consumption option for UE to achieve utility maximization based on different cost coefficients. In addition, the power allocation strategies and their associated constraints are investigated in both OMA and NOMA transmission schemes. Finally, through numerical simulations, we quantitatively analyze the impact of low level power allocation and high level QP control on UEs’ utility gain and the system throughput performance.