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Joint User Association and Robust Beamforming Optimization for C-RANs with Wireless Fronthauls

Authors:
Zamani, A. ,  Taghizade, O. ,  Dartmann, G. ,  Mathar, R. ,  Schmeink, A.
Book Title:
The 20th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2019)
Pages:
p.p. 1-5
Date:
Jul. 2019
ISSN:
1948-3244
DOI:
10.1109/SPAWC.2019.8815413
hsb:
RWTH-2019-09690
Language:
English

Abstract

Future networks are expected to accommodate an ultra-dense distribution of users and infrastructure, whilst satisfying high quality of service (QoS) demands. In such interference limited scenarios, coordinated multi-point joint transmission (CoMP-JT) schemes are known to achieve considerable gains by making use of the interference signals. Unfortunately, the widespread implementation of such solutions face various challenges, such as imperfect channel state information (CSI) availability, limited capacity fronthaul links as well as the high cost of fiber. In this work, we address these challenges in a multiuser downlink C-RAN with wireless fronthaul links. Our goal is to minimize the overall network power consumption, by obtaining the optimal user associations, remote radio heads (RRHs) states, robust beamforming designs and the power allocated to the wireless fronthaul. The optimization is formulated as a mixed integer-second order cone (MI-SoCP), which uses second order CSI statistics. We investigate the performance of our solution via numerical evaluations, which indicate significant improvements in terms of power consumption and user rate.

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