Channel alternation and rotation for tri-sectored directional antenna cellular systems

IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI:10.1109/VTC.2001.956627

V. A. Nguyen, P. Wan, O. Frieder

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引用次数: 3

Abstract

Due to discrete reuse cluster sizes, disjoined and uniformed channel assignment, conventional tri-sectored cellular systems have not taken full advantage of antenna directivities. We present a novel channel alternation and rotation (CAR) scheme to coordinate channel assignment with antenna directivities. In CAR, the cell layout is based on two-tier cell-reuse structure and each cell is allocated one extra channel set for channel alternations and rotations. The extra channel set gives the network designer the flexibility to assign channels according to nearest front lobe interference avoidant strategy to enhance co-channel interference ratio (C/I). CAR allows deployment of smaller, non-integer reuse cluster sizes based on C/I requirements, thus increases frequency reuse efficiency. CAR reuse plans can increase the channel capacity up to 31.25% while still maintain comparable C/I margins. CAR is simple and can be employed in any existing directional antenna system. Therefore, it truly does not impose any additional cost.

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三扇形定向天线蜂窝系统的信道交替和旋转

由于离散的复用簇大小、分离的和统一的信道分配，传统的三扇区蜂窝系统没有充分利用天线的方向性。我们提出了一种新的信道交替和旋转(CAR)方案来协调信道分配与天线方向。在CAR中，单元布局基于两层单元重用结构，每个单元分配一个额外的信道集用于信道交替和旋转。额外的信道集使网络设计者能够灵活地根据最近前瓣干扰避免策略分配信道，以提高同信道干扰比(C/I)。CAR允许基于C/I需求部署较小的非整数重用簇大小，从而提高频率重用效率。CAR重用计划可以将信道容量增加到31.25%，同时仍然保持相当的C/I利润率。CAR结构简单，可用于任何现有的定向天线系统。因此，它确实不施加任何额外的成本。

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IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)

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