The various cell patterns have been proposed in order to increase the system traffic capacity in cellular mobile communications. One conventional approach is to reduce the cell size. However, this system needs many base stations and causes many handoffs. As an alternative approach, a dual cell structure with 9-3 frequency reuse pattern is proposed, in which the outer large and inner small cells have 9 and 3 frequency reuse patterns, respectively. The performance of this proposed system is compared with that of the conventional 7 cell frequency reuse pattern in terms of the traffic handling capacity and blocking probability. The traffic handling capacity of the proposed system is increased by 10 % in the omni-directional cell and by 4 % in the sector cell even in severe interference environment provided that the inner small accommodates 50% of the total offered traffic.
