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.
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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.
| Type: | Article |
|---|---|
| Title: | Energy-Efficient Heterogeneous Cellular Networks with Spectrum Underlay and Overlay Access |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TVT.2017.2773506 |
| Publisher version: | https://doi.org/10.1109/TVT.2017.2773506 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Interference, Resource management, Bandwidth, Optimization, Cellular networks, Quality of service, Power demand |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10042595 |
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