On the energy efficiency of NOMA for wireless backhaul in multi-tier heterogeneous CRAN

Tran, Huu Q., Truong, Phuc Q., Phan, Ca V. and Vien, Quoc-Tuan ORCID: https://orcid.org/0000-0001-5490-904X (2017) On the energy efficiency of NOMA for wireless backhaul in multi-tier heterogeneous CRAN. In: 2017 International Conference on Recent Advances on Signal Processing, Telecommunications & Computing (SigTelCom), 09-11 Jan 2017, Da Nang, Vietnam. (doi:10.1109/SIGTELCOM.2017.7849827)

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This paper addresses the problem of wireless backhaul in a multi-tier heterogeneous cellular network coordinated by a cloud-based central station (CCS), namely heterogeneous cloud radio access network (HCRAN). A non-orthogonal multiple access (NOMA) is adopted in the power domain for improved spectral efficiency and network throughput of the wireless downlink in the HCRAN. We first develop a power allocation for multiple cells of different tiers taking account of the practical power consumption of different cell types and wireless backhaul. By analysing the energy efficiency (EE) of the NOMA for the practical HCRAN downlink, we show that the power available at the cloud, the propagation environment and cell types have significant impacts on the EE performance. In particular, in a large network, the cells located at the cloud edge are shown to suffer from a very poor performance with a considerably degraded EE, which accordingly motivates us to propose an iteration algorithm for determining the maximal number of cells that can be supported in the HCRAN. The results reveal that a double number of cells can be covered in the urban environment compared to those in the shadowed urban environment and more than 1.5 times of the number of microcells can be deployed over the macrocells, while only a half number of cells can be supported when the distance between them increases threefold

Item Type: Conference or Workshop Item (Paper)
Research Areas: A. > School of Science and Technology > Computer and Communications Engineering
Item ID: 21312
Notes on copyright: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Depositing User: Quoc-Tuan Vien
Date Deposited: 16 Feb 2017 16:43
Last Modified: 30 May 2019 22:31
ISBN: 9781509022922
URI: https://eprints.mdx.ac.uk/id/eprint/21312

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