EURASIP Journal on Wireless Communications and Networking (Jan 2010)

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

  • Zhenning Shi,
  • Mark C. Reed,
  • Ming Zhao

DOI
https://doi.org/10.1155/2010/240745
Journal volume & issue
Vol. 2010

Abstract

Read online

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.