Indoor Planning for High Speed Downlink Packet Access in WCDMA Cellular Network |
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Authors: | Tero Isotalo Jukka Lempiäinen Jarno Niemelä |
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Institution: | (1) Antennas, Propagation and Radio Networking Section, Department of Electronic Systems, Aalborg University, Aalborg, Denmark |
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Abstract: | The aim of this paper is to show the special characteristics of the indoor environment related to radio propagation and furthermore
to radio network planning. The aspects of the radio network planning are highlighted especially for Wideband Code Division
Multiple Access (WCDMA) radio access technology that is used widely in the third generation mobile networks. Moreover, the
detailed planning parameters in indoor environment are studied for High Speed Downlink Packet Access (HSDPA) in order to support
high throughput data applications in Universal Mobile Telecommunications System (UMTS). The final target of the paper is to
compare pico cell, distributed antenna system (DAS), and radiating cable network configurations in indoor environment to provide
the optimal radio conditions for the data applications, and thus to serve highest number of mobile users. Several measurement
campaigns with different antenna configurations have been conducted in order to study the effect of multi path related parameters,
as delay spread of the signal. Also other capacity related parameters as received signal levels, interference, throughput,
and transmit power levels have been studied in order to find out the optimal solution for HSDPA in UMTS. The results clearly
show that pico cells and distributed antenna system have outstanding performance in indoor propagation channel compared to
radiating cable. In sense of signal quality, pico cell performance is slightly better compared to distributed antenna system.
However, measurements with HSDPA indicate that practical capacity of DAS outperforms pico cells. The measurements also show
that separation of the antennas is a key capacity related parameter when planning WCDMA based indoor systems. |
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