Abstract
Conventional trisectored cellular systems have not taken full advantages of antenna directivities to enhance frequency reuse efficiency. A novel Channel Alternation and Rotation (CAR) scheme is proposed to coordinate channel assignments with antenna directivities. CAR employs a multi-interval cell-reuse layout. Each cell type is allocated extra channel set(s) to provide network designers the flexibility to assign channels avoiding nearest front lobe interference to enhance the carrier to interference ratio (C/I). CAR allows deployment of smaller and non-integer reuse factors based on C/I requirements, thus increasing channel capacity. Since current base station equipment is utilized, no additional costs are introduced.
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