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A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks

Successful deployment of femtocells within a macrocell coverage area would be hindered if cross-layer and co-layer interference in such heterogeneous networks (HetNets) is not properly mitigated. Through spectrum management, cross-layer interference between macrocell and femtocell network layers can...

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Main Authors:	Mohamad Maharum, S. M., Fisal, N., Lo, A., Ghafar, A. S. A., Saparudin, F. A., Katiran, N.
Format:	Article
Published:	Wiley Blackwell 2016
Subjects:	TK Electrical engineering. Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/72034/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991486833&doi=10.1002%2fett.2860&partnerID=40&md5=ccc96c12399c6774c6010d66cb3b432d
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spelling	my.utm.720342017-11-22T12:07:37Z http://eprints.utm.my/id/eprint/72034/ A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks Mohamad Maharum, S. M. Fisal, N. Lo, A. Ghafar, A. S. A. Saparudin, F. A. Katiran, N. TK Electrical engineering. Electronics Nuclear engineering Successful deployment of femtocells within a macrocell coverage area would be hindered if cross-layer and co-layer interference in such heterogeneous networks (HetNets) is not properly mitigated. Through spectrum management, cross-layer interference between macrocell and femtocell network layers can be avoided by assigning the network layers with orthogonal spectrum bands. However, the orthogonal spectrum assignments in prior works are no longer effective because they may not guarantee the variation of users' traffic demand in HetNets to be satisfied all the time. Therefore, a centralised and dynamic orthogonal spectrum assignment called demand-based spectrum orthogonalisation (DeBaSO) is proposed in this paper to address the interference issues in downlink of LTE-Advanced HetNets. In our proposed scheme, the problem of orthogonal spectrum assignment is formulated with the objective to maximise the overall system throughput based on the requirement of physical spectral resources to satisfy the users' traffic demand. Additionally, the co-layer interference among femtocells is avoided by grouping the adjacent femtocells into different femtocell clusters. To do so, typical model of spatial frequency reuse is exploited in this paper. In this way, femtocells that are grouped within the same cluster can universally reuse the assigned spectrum resource without creating co-layer interference among them. Numerical results indicate that the proposed scheme achieves a remarkable performance in terms of overall system throughput and spectrum efficiency because the cross-layer and co-layer interference is entirely avoided. The achievements prove that DeBaSO scheme overcomes the limitations found in other orthogonal spectrum assignments, which were previously proposed in the literature. Wiley Blackwell 2016 Article PeerReviewed Mohamad Maharum, S. M. and Fisal, N. and Lo, A. and Ghafar, A. S. A. and Saparudin, F. A. and Katiran, N. (2016) A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks. Transactions on Emerging Telecommunications Technologies, 27 (10). pp. 1308-1330. ISSN 2161-5748 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991486833&doi=10.1002%2fett.2860&partnerID=40&md5=ccc96c12399c6774c6010d66cb3b432d
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TK Electrical engineering. Electronics Nuclear engineering
spellingShingle	TK Electrical engineering. Electronics Nuclear engineering Mohamad Maharum, S. M. Fisal, N. Lo, A. Ghafar, A. S. A. Saparudin, F. A. Katiran, N. A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
description	Successful deployment of femtocells within a macrocell coverage area would be hindered if cross-layer and co-layer interference in such heterogeneous networks (HetNets) is not properly mitigated. Through spectrum management, cross-layer interference between macrocell and femtocell network layers can be avoided by assigning the network layers with orthogonal spectrum bands. However, the orthogonal spectrum assignments in prior works are no longer effective because they may not guarantee the variation of users' traffic demand in HetNets to be satisfied all the time. Therefore, a centralised and dynamic orthogonal spectrum assignment called demand-based spectrum orthogonalisation (DeBaSO) is proposed in this paper to address the interference issues in downlink of LTE-Advanced HetNets. In our proposed scheme, the problem of orthogonal spectrum assignment is formulated with the objective to maximise the overall system throughput based on the requirement of physical spectral resources to satisfy the users' traffic demand. Additionally, the co-layer interference among femtocells is avoided by grouping the adjacent femtocells into different femtocell clusters. To do so, typical model of spatial frequency reuse is exploited in this paper. In this way, femtocells that are grouped within the same cluster can universally reuse the assigned spectrum resource without creating co-layer interference among them. Numerical results indicate that the proposed scheme achieves a remarkable performance in terms of overall system throughput and spectrum efficiency because the cross-layer and co-layer interference is entirely avoided. The achievements prove that DeBaSO scheme overcomes the limitations found in other orthogonal spectrum assignments, which were previously proposed in the literature.
format	Article
author	Mohamad Maharum, S. M. Fisal, N. Lo, A. Ghafar, A. S. A. Saparudin, F. A. Katiran, N.
author_facet	Mohamad Maharum, S. M. Fisal, N. Lo, A. Ghafar, A. S. A. Saparudin, F. A. Katiran, N.
author_sort	Mohamad Maharum, S. M.
title	A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
title_short	A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
title_full	A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
title_fullStr	A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
title_full_unstemmed	A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks
title_sort	demand-based spectrum orthogonalisation scheme for interference avoidance in lte-advanced heterogeneous networks
publisher	Wiley Blackwell
publishDate	2016
url	http://eprints.utm.my/id/eprint/72034/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991486833&doi=10.1002%2fett.2860&partnerID=40&md5=ccc96c12399c6774c6010d66cb3b432d
_version_	1643656341700476928
score	13.211869

A demand-based spectrum orthogonalisation scheme for interference avoidance in LTE-Advanced heterogeneous networks

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