Open Access

Optimum Antenna Downtilt Angles for Macrocellular WCDMA Network

EURASIP Journal on Wireless Communications and Networking20052005:610942

DOI: 10.1155/WCN.2005.816

Received: 3 January 2005

Published: 12 December 2005

Abstract

The impact of antenna downtilt on the performance of cellular WCDMA network has been studied by using a radio network planning tool. An optimum downtilt angle has been evaluated for numerous practical macrocellular site and antenna configurations for electrical and mechanical antenna downtilt concepts. The aim of this massive simulation campaign was expected to provide an answer to two questions: firstly, how to select the downtilt angle of a macrocellular base station antenna? Secondly, what is the impact of antenna downtilt on system capacity and network coverage? Optimum downtilt angles were observed to vary between depending on the network configuration. Moreover, the corresponding downlink capacity gains varied between . Antenna vertical beamwidth affects clearly the required optimum downtilt angle the most. On the other hand, with wider antenna vertical beamwidth, the impact of downtilt on system performance is not such imposing. In addition, antenna height together with the size of the dominance area affect the required downtilt angle. Finally, the simulation results revealed how the importance of the antenna downtilt becomes more significant in dense networks, where the capacity requirements are typically also higher.

Keywords

electrical downtilt other-cell interference mechanical downtilt network coverage system capacity WCDMA

Authors’ Affiliations

(1)
Institute of Communications Engineering, Tampere University of Technology

Copyright

© Niemelä et al. 2005

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.