Dynamic femtocell resource allocation for managing inter-tier interference in downlink of heterogeneous networks

Saeed, A., Imran, M. A. , Katranaras, E. and Dianati, M. (2016) Dynamic femtocell resource allocation for managing inter-tier interference in downlink of heterogeneous networks. IET Communications, 10(6), pp. 641-650. (doi:10.1049/iet-com.2015.0153)

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Abstract

This study investigates the downlink resource allocation problem in orthogonal frequency division multiple access heterogeneous networks consisting of macrocells and femtocells sharing the same frequency band. The focus is to devise optimised policies for femtocells' access to the shared spectrum, in terms of femtocell transmissions, in order to maximise femto-users (FUEs) sum data rate while ensuring that certain level of quality of service (QoS) for the macro-cell users in the vicinity of femtocells is provided. The optimal solution to this problem is obtained by employing the well-known dual Lagrangian method and the optimal femtocell transmit power and resource allocation solution is derived in detail. However, the optimal solution introduces high computational complexity. To this end, a heuristic solution to the problem is proposed. The algorithms to implement both optimal and efficient suboptimal schemes in a practical system are also given in detail while their complexity is compared. Simulation results show that proposed dynamic resource allocation scheme (a) ensures the macro-users QoS requirements compared with the Reuse-1 scheme, where femtocells are allowed to transmit at full power and bandwidth; (b) can maintain FUE data rates at high levels; (c) provides performance close to the optimal solution, while introducing much lower complexity.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Imran, Professor Muhammad
Authors: Saeed, A., Imran, M. A., Katranaras, E., and Dianati, M.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IET Communications
Publisher:Institution of Engineering and Technology
ISSN:1751-8628
ISSN (Online):1751-8636
Copyright Holders:Copyright © 2016 The Institution of Engineering and Technology
First Published:First published in IET Communications 10(6): 641-650
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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