ISSN : 1796-2021
Volume : 3    Issue : 4    Date : September 2008

An Adaptive Beam-Shaping Strategy for WCDMA Multicellular Networks with Non-Uniform Traffic
Panagiotis K. Gkonis, George V. Tsoulos, Georgia E. Athanasiadou, and Dimitra I. Kaklamani
Page(s): 16-25
Full Text:
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This paper investigates the performance of an adaptive beam-shaping (ABS) strategy for wideband
code division multiple access (WCDMA) multicellular networks with antenna arrays (AAs) at the
base station (BS). The purpose of this ABS strategy is to form beams in directions of increased
traffic distribution while at the same time minimize the total downlink transmission power.
Performance is evaluated statistically with Monte Carlo (MC) simulations through a grid-enabled
WCDMA system level simulator in terms of achievable throughput per beam for a network with up to
four tiers of cells and increased loading (up to 90%). Results are presented for multirate services
which show that the proposed ABS strategy can increase the throughput per beam relatively to a
fixed grid of beams sectorization strategy up to 75/120/165% with 1/2/3 hotspots per cell
respectively, while this gain is up to 35% for uniform traffic distribution. Moreover, it is shown that
this gain can be achieved while at the same time the blocking probability in the central cell is
reduced and the overall throughput of the network increased.

Index Terms
WCDMA, hospot areas, adaptive beamforming, Monte Carlo simulations.