López-Pérez, D., Chu, X. and Guvenc, I. (2012) On the expanded region of picocells in heterogeneous networks. IEEE Journal of Selected Topics in Signal Processing, 6 (3). 281 - 294 . ISSN 1932-4553
Abstract
In order to expand the downlink (DL) coverage areas of picocells in the presence of an umbrella macrocell, the concept of range expansion has been recently proposed, in which a positive range expansion bias (REB) is added to the DL received signal strengths (RSSs) of picocell pilot signals at user equipments (UEs). Although range expansion may increase DL footprints of picocells, it also results in severe DL inter-cell interference in picocell expanded regions (ERs), because ER picocell user equipments (PUEs) are not connected to the cells that provide the strongest DL RSSs. In this paper, we derive closed-form formulas to calculate appropriate REBs for two different range expansion strategies, investigate both DL and uplink (UL) inter-cell interference coordination (ICIC) to enhance picocell performance, and propose a new macrocell-picocell cooperative scheduling scheme to mitigate both DL and UL interference caused by macrocells to ER PUEs. Simulation results provide insights on REB selection approaches at picocells, and demonstrate the benefits of the proposed macrocell-picocell cooperative scheduling scheme over alternative approaches.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | Coordination; heterogeneous; interference; picocell; radio resource management; range expansion |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Jun 2014 12:47 |
Last Modified: | 17 Jun 2014 12:47 |
Published Version: | http://dx.doi.org/10.1109/JSTSP.2012.2190381 |
Status: | Published |
Publisher: | IEEE |
Refereed: | Yes |
Identification Number: | 10.1109/JSTSP.2012.2190381 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:77288 |
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Filename: On the expanded region of picocells in heterogeneous networks.pdf
