Use of Adaptive Sectorisation for Capacity Enhancement in CDMA Cellular Systems with Non-Uniform Traffic

  • Authors:

  • Trung V. Nguyen;Prem Dassanayake;Mike Faulkner

  • Affiliations:

  • Centre for Telecommunications and Micro-Electronics, Faculty of Engineering and Science, Victoria University, P.O. Box 14428, Melbourne City, MC, VIC 8001, Australia E-mail: trung@sci.vu.e ...;Centre for Telecommunications and Micro-Electronics, Faculty of Engineering and Science, Victoria University, P.O. Box 14428, Melbourne City, MC, VIC 8001, Australia;Centre for Telecommunications and Micro-Electronics, Faculty of Engineering and Science, Victoria University, P.O. Box 14428, Melbourne City, MC, VIC 8001, Australia

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2004

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Abstract

This paper discusses the application of adaptivesectorisation in the capacity enhancement of a CDMA cellularsystem dealing with non-uniform traffic. It considers theparticular case where the traffic distribution consists ofisolated areas of congested traffic called Hot Spots (HS). It isenvisaged that the traffic density inside a HS is many more timesthat outside the HS. A more even traffic distribution amongsectors is attempted by re-adjustment of sector boundaries usingfinite antenna beam switching. System capacity is estimated on thebasis of tolerable interference in a sector taking into account ofboth intrasector and intersector interference in a multicellenvironment. Interference is evaluated under the assumption ofperfect power control in the uplink. Normal propagationenvironment is assumed in the cell that allows path losses andshadowing losses in the mobile radio signal. Variation in theantenna gain is also accommodated by taking appropriate radiationpattern into account. It is shown that successive sectoradjustment with increasing HS traffic intensity can deter callblocking in the HS sector. It is also shown that a significantimprovement in system capacity could be obtained with adaptivesectorisation particularly when the HS user density is severalorders of magnitude higher than that outside the HS.