eprintid: 10042595
rev_number: 28
eprint_status: archive
userid: 608
dir: disk0/10/04/25/95
datestamp: 2018-02-06 10:51:12
lastmod: 2021-09-25 23:11:46
status_changed: 2019-10-07 10:46:53
type: article
metadata_visibility: show
creators_name: Tang, J
creators_name: So, DKC
creators_name: Alsusa, EA
creators_name: Hamdi, KA
creators_name: Shojaeifard, A
creators_name: Wong, KK
title: Energy-Efficient Heterogeneous Cellular Networks with Spectrum Underlay and Overlay Access
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F46
keywords: Interference, Resource management, Bandwidth, Optimization, Cellular networks, Quality of service, Power demand
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: IEEE In this paper, we provide joint subcarrier assignment and power allocation schemes for quality-of-service (QoS)-constrained energy-efficiency (EE) optimization in the downlink of an orthogonal frequency division multiple access (OFDMA)-based two-tier heterogeneous cellular network (HCN). Considering underlay transmission, where spectrum-efficiency (SE) is fully exploited, the EE solution involves tackling a complex mixed-combinatorial and non-convex optimization problem. With appropriate decomposition of the original problem and leveraging on the quasi-concavity of the EE function, we propose a dual-layer resource allocation approach and provide a complete solution using difference-of-two-concave-functions approximation, successive convex approximation and gradient-search method. On the other hand, the inherent inter-tier interference from spectrum underlay access may degrade EE particularly under dense small-cell deployment and large bandwidth utilization. We therefore develop a novel resource allocation approach based on the concepts of spectrum overlay access and resource efficiency (RE) (normalized EE-SE trade-off). Specifically, the optimization procedure is separated where the macro-cell optimal RE and the corresponding bandwidth is first determined, then the EE of small-cells utilizing the remaining spectrum is maximized. Simulation results confirm the theoretical findings and demonstrate that the proposed resource allocation schemes can approach the optimal EE with each strategy being superior under certain system settings.
date: 2018-03
date_type: published
official_url: https://doi.org/10.1109/TVT.2017.2773506
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1427262
doi: 10.1109/TVT.2017.2773506
lyricists_name: Shojaeifard, Arman
lyricists_name: Wong, Kai-Kit
lyricists_id: ASHOJ33
lyricists_id: KWONG98
actors_name: Wong, Kai-Kit
actors_id: KWONG98
actors_role: owner
full_text_status: public
publication: IEEE Transactions on Vehicular Technology
volume: 67
number: 3
pagerange: 2439-2453
issn: 0018-9545
citation:        Tang, J;    So, DKC;    Alsusa, EA;    Hamdi, KA;    Shojaeifard, A;    Wong, KK;      (2018)    Energy-Efficient Heterogeneous Cellular Networks with Spectrum Underlay and Overlay Access.                   IEEE Transactions on Vehicular Technology , 67  (3)   pp. 2439-2453.    10.1109/TVT.2017.2773506 <https://doi.org/10.1109/TVT.2017.2773506>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10042595/1/1610.09683v1.pdf