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This paper considers wireless powered communication networks (WPCNs), where mobile users first harvest energy from a dedicated power station and then communicate with an information receiving station. We aim to maximize the weighted sum of user-centric energy efficiency (WSUEE) via joint time allocation and power control in both downlink and uplink. The proposed approach provides the flexibility of...
This paper presents a downlink power optimization scheme to improve LTE system performance in accordance with UE speed. Especially in railway wireless communication system, the speed of UE is very important factor because trains move so fast over 300km/h that usually downlink performance should be degraded. So the additional requirements for the high-speed railway mobile communication system besides...
We propose and analyze a class of distributed algorithms performing the joint optimization of radio resources in heterogeneous cellular networks made of a juxtaposition of macro and small cells. We show that within this context, it is essential to use algorithms able to simultaneously solve the problems of channel selection, user association and power control. In such networks, the unpredictability...
We consider distributed uplink open-loop power control for orthogonal frequency division multiple access (OFDMA) cellular systems. To touch simultaneously on two main performance metrics in cellular systems, average throughput and cell-edge throughput, we focus on a metric of tradeoff performance. First we investigate two extreme cases to show that the wellknown SNR-based scheme and the INR-based...
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