METHOD OF OPTIMIZING CHANNEL SELECTION IN CELLULAR TELEPHONE NETWORKS

摘要

In a cellular telephone network the geographical area covered by the network is subdivided into a large number of small sub-areas of generally equal shape and size. The received signal strengths are measured at each sub-area and the source of the strongest signal for the sub-area is defined as the serving cell site and the remaining signals as interferer signals. Carrier to interference (CIR) ratios are thereafter calculated and compared to a predetermined minimum CIR level for the network. For each cell site of the network the total number of sub-areas in which signal strengths have been ascertained is aggregated and compared with the number of such sub-areas in which the CIR is above the minimum value, to thereby determine the probability of interference occurring in that cell with one or more signals received from other cell sites if the same channel frequency is reused. The method therefore provides a means to optimize channel selection by selecting a channel having the lowest probability of co-channel interference.