Indoor Planning for High Speed Downlink Packet Access in WCDMA Cellular Network

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.

[1]  Y. P. Zhang.  Indoor radiated-mode leaky feeder propagation at 2.0 GHz , 2001, IEEE Trans. Veh. Technol..

[2]  Jukka Lempiäinen,et al.  Utilization of an Indoor DAS for Repeater Deployment in WCDMA , 2006, 2006 IEEE 63rd Vehicular Technology Conference.

[3]  Jukka Lempiäinen,et al.  Measurements for Distributed Antennas in WCDMA Indoor Network , 2006 .

[4]  Jari Niemelä,et al.  Optimization of Soft Handover Parameters for UMTS Network in Indoor , 2005 .

[5]  C. Seltzer.  Indoor coverage requirements and solutions , 1998 .

[6]  Jukka Lempiäinen,et al.  Optimum Antenna Downtilt Angles for Macrocellular WCDMA Network , 2005, EURASIP J. Wirel. Commun. Netw..

[8]  Simon R. Saunders,et al.  Antennas and Propagation for Wireless Communication Systems , 1999 .

[9]  Antti Toskala,et al.  HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications , 2006 .

[10]  Samuel Harju-Jeanty.  Space Diversity in Indoor WCDMA System , 2002 .

[11]  J. Laiho-Steffens,et al.  Modeling the impact of the fast power control on the WCDMA uplink , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[12]  Jukka Lempiäinen,et al.  HSDPA Measurements for Indoor DAS , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[13]  A. Viterbi.  CDMA: Principles of Spread Spectrum Communication , 1995 .

[14]  William C. Y. Lee,et al.  Mobile Communications Design Fundamentals: Lee/Mobile , 1993 .

[15]  H. Hashemi,et al.  The indoor radio propagation channel , 1993, Proc. IEEE.

[16]  Antti Toskala,et al.  Wcdma for Umts , 2002 .

[17]  Preben Mogensen,et al.  The downlink orthogonality factors influence on WCDMA system performance , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[18]  E. Zehavi,et al.  Soft handoff extends CDMA cell coverage and increases reverse link capacity , 1994, IEEE J. Sel. Areas Commun..

[19]  Matti Manninen,et al.  UMTS radio network planning, optimization and QOS management for practical engineering tasks , 2006, IEEE Communications Magazine.

[20]  J. Laiho-Steffens,et al.  Soft handover gains in a fast power controlled WCDMA uplink , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).