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Downlink and Uplink Energy Minimization Through User Association and Beamforming in Cloud RAN by Luo, Shixin; Zhang, Rui; Lim, Teng Joon is a scholarly article available to read on EtoBox.

What is Downlink and Uplink Energy Minimization Through User Association and Beamforming in Cloud RAN about?

The cloud radio access network (C-RAN) concept, in which densely deployed access points (APs) are empowered by cloud computing to cooperatively support mobile users (MUs), to improve mobile data rates, has been recently proposed. However, the high density of active ("on") APs results in severe interference and also inefficient energy consumption. Moreover, the growing popularity of highly interactive applications with stringent uplink (UL) requirements, e.g. network gaming and real-time broadcasting by wireless users, means that the UL transmission is becoming more crucial and requires special attention. Therefore in this paper, we propose a joint downlink (DL) and UL MU-AP association and beamforming design to coordinate interference in the C-RAN for energy minimization, a problem which is shown to be NP hard. Due to the new consideration of UL transmission, it is shown that the two state-of-the-art approaches for finding computationally efficient solutions of joint MU-AP association and beamforming considering only the DL, i.e., group-sparse optimization and relaxed-integer programming, cannot be modified in a straightforward way to solve our problem. Leveraging on the celebrated

Author

Luo, Shixin; Zhang, Rui; Lim, Teng Joon

Published

2014

Language

EN