Impact of Angular Spread on Higher Order Sectorization in WCDMA Systems

This paper analyzes higher order sectorization (HOS) in WCDMA. Sectorization is achieved by splitting the sites into smaller sectors using highly directional antennas. The impact of angular spread on the system throughput is evaluated using a dynamic radio network simulator. Increasing the number of sectors per site from 3 to 6 and 12 in a typical urban radio channel yields a downlink system capacity gain of 80% and 200% respectively. Simulations have shown that the increase in the ratio of users in soft and softer handover per sector is negligible and the impact of angular spread on the system performance of a 6 and 12 sector sites is minor and negligible for the 3 sector sites

[1]  Armin Dekorsy,et al.  System level simulations for downlink beamforming with different array topologies , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[2]  Armin Dekorsy,et al.  System capacity from UMTS smart antenna concepts , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[3]  H. Ku,et al.  Performance study of space-time transmit diversity and sectorisation in WCDMA radio networks , 2004, 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514).

[4]  Ying Sun,et al.  CPICH power settings in irregular WCDMA macro cellular networks , 2003, 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003..

[5]  J. Laiho-Steffens,et al.  The impact of the base station sectorisation on WCDMA radio network performance , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[6]  Preben E. Mogensen,et al.  A stochastic model of the temporal and azimuthal dispersion seen at the base station in outdoor propagation environments , 2000, IEEE Trans. Veh. Technol..

[7]  P. Zetterberg.  Performance of three, six, nine and twelve sector sites in CDMA - based on measurements , 2004, Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738).

[8]  Preben E. Mogensen,et al.  Application and performance of downlink beamforming techniques in UMTS , 2003, IEEE Commun. Mag..

[9]  Andrew Logothetis,et al.  SINR estimation and orthogonality factor calculation of DS-CDMA signals in MIMO channels employing linear transceiver filters , 2007, Wirel. Commun. Mob. Comput..

[10]  Ernst Bonek,et al.  Performance of downlink beam switching for UMTS FDD in the presence of angular spread , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[11]  Bo Hagerman,et al.  Downlink capacity comparison between different smart antenna concepts in a mixed service W-CDMA system , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).