Patent ID: 6847820
Filing Date: 2005-01-25
Classification: H04W

Abstract:
1. A method of reducing inter cell interference in a cellular wireless commutations system having multiple adjacent cells which provide service to a geographic area, each cell having a base station with a sectored antenna for bi-directional communication with customer premise equipment located in sectors of said cells, each cell being divided into four sectors, the base stations in adjacent cells being arranged in a straight grid configuration wherein the base stations are located in rows and columns, the method comprising: Selecting three or more frequency sets for upstream and downstream communication between said base stations and said customer premise equipment; employing an orthogonal polarization diversity scheme between communications in adjacent sectors within each cell and between cells; and rotating the sectors in each cell such that dividing lines between sectors are off-set relative to the grid configuration by a configurable angle, the configurable angle being in the range +/−17.5° to +−27.5° and offset in one direction in every second row and offset in an opposite direction in intermediate rows, whereby the combination of the polarization diversity scheme, frequency set selection and rotating the sectors reduce the number of interference zones between adjacent sectors.