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Open Access

On Uplink Interference Scenarios in Two-Tier Macro and Femto Co-Existing UMTS Networks

EURASIP Journal on Wireless Communications and Networking20102010:240745

Received: 4 September 2009

Accepted: 2 March 2010

Published: 14 April 2010


A two-tier UMTS network is considered where a large number of randomly deployed Wideband Code Division Multiple Access (WCDMA) femtocells are laid under macrocells where the spectrum is shared. The cochannel interference between the cells may be a potential limiting factor for the system. We study the uplink of this hybrid network and identify the critical scenarios that give rise to substantial interference. The mechanism for generating the interference is analyzed and guidelines for interference mitigation are provided. The impacts of the cross-tier interference especially caused by increased numbers of users and higher data rates are evaluated in the multicell simulation environment in terms of the noise rise at the base stations, the cell throughput, and the user transmit power consumption.


Power ConsumptionSystem ApplicationSimulation EnvironmentHigh DataFull Article

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Authors’ Affiliations

NICTA, Canberra Research Laboratory, Canberra, Australia
The Australian National University, Australia
Alcatel Lucent-Shanghai Bell, China


© Zhenning Shi et al. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.