Method of providing a matrix indicating interference relationships between cells of a cellular communication system

摘要

A method of providing a matrix indicating interference relationships between cells of a cellular communication system comprises the steps of receiving measurement reports from mobile stations, the reports containing signal strength metric data of a serving cell and signal strength metric and identity data of a plurality of other cells, comparing the signal strength metrics of each other cell with those of the serving cell to provide a set of comparison values and determining the matrix from the comparison values and identity data. The step of comparing signal strengths involves subtracting the signal strength value N i of the other cell from the signal strength value S i of the serving cell. A number of S i -N i values are calculated for a particular other cell and a histogram is formed from the count occurrence of each value. The levels of occurrence are normalised and totalised within predetermined ranges of S-N value on the histogram to provide an interference coefficient for the particular other cell. The coefficients for all other cells form a matrix of values which is used for frequency planning.