Improving WCDMA netwotk capacity using adaptive sectorisation

Abstract

A major problem affecting the capacity of Wideband Code Division Multiple Access (WCDMA) is interference. This work focuses on reducing co-channel interference problem by the application of adaptive sectorisation in nonuniform traffic. It considers an isolated areas of congested traffic called Hot Spots (HS). It is envisaged that the traffic density inside a HS is many more times that outside the HS. A more even traffic distribution among
sectors is attempted by re-adjustment of sector boundaries using finite antenna beam switching. System capacity is estimated on the basis of tolerable interference in a sector taking into account intrasector and
intersector interference in a multicell environment. Perfect power control in the uplink is assumed. Path losses and shadowing losses is considered. It is shown that a significant improvement in system capacity could be obtained with adaptive sectorisation.