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Methods and apparatus for assigning frequencies in a cellular network
| Details |
Inventors: Boyer, Pete A.; Vicharelli, Pablo A.; Jennison, Alan B.;
Assignee: GTE Laboratories Incorporated (Waltham, MA); GTE Mobilnet Service Corp. (Atlanta, GA)
Primary Examiner: To; Doris H.
Assistant Examiner:
Attorney, Agent or Firm: Suchyta; Leonard Charles
A method and computerized apparatus for assigning frequencies to a plurality of cells in a cellular network. Each cell requires a predetermined number of frequencies. The method includes generating a difficulty factor for each cell, wherein each cell's difficulty factor is based on an adjustment factor for that cell, and wherein, following a first unsuccessful assignment attempt, each cell's adjustment factor is indicative of a relative level of difficulty in selecting frequencies for that cell during the first unsuccessful assignment attempt. The method further includes the steps of selecting a cell from the plurality of cells based on each cell's difficulty factor; selecting a frequency from the available frequencies for the selected cell; when at least one of the plurality of cells requires at least one more frequency and there is at least one frequency available for use by that cell, repeating the steps of generating a difficulty factor, selecting a cell and selecting a frequency; and when at least one of the plurality of cells requires at least one more frequency and there are no frequencies available for use by that cell, updating each cell's adjustment factor, unselecting all of the selected cells and all of the selected frequencies for the selected cells, and re-performing the steps of generating a difficulty factor, selecting a cell, selecting a frequency, as a second assignment attempt. |
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DETAILED DESCRIPTION An embodiment of the present invention is directed to a method for assigning frequencies to a plurality of cells in a cellular network.
The method includes a step of generating a difficulty factor for each cell, wherein each cell's difficulty factor is based on a number of available frequencies for that cell, and wherein the number of available frequencies for that cell is a variable number that can vary as frequencies are selected for cells in the cellular network.
The method further includes the steps of selecting a cell from the plurality of cells based on each cell's difficulty factor; selecting a frequency for the selected cell from the available frequencies for that cell; and repeating the steps of generating a difficulty factor, selecting a cell and selecting a frequency, to assign the frequencies to the plurality of cells in the cellular network.
In another embodiment, each cell requires a predetermined number of frequencies to be selected for that cell.
The step of generating a difficulty factor includes a step of determining each cell's difficulty factor based on the predetermined number of frequencies required to be selected for that cell, the number of available frequencies for that cell, and an adjustment factor for that cell, wherein each cell's adjustment factor is indicative of a relative level of difficulty in selecting the required predetermined number of frequencies for that cell during a previous assignment attempt.
In another embodiment, the method further includes a step of, following an unsuccessful attempt to assign frequencies to the plurality of cells, updating each cell's adjustment factor to represent the relative difficulty in selecting frequencies for that cell during the unsuccessful attempt, unselecting all of the selected cells and all of the selected frequencies for the selected cells, and re-performing the steps of generating a difficulty factor, selecting a cell, selecting a frequency, and repeating.
In another embodiment, the step of updating, unselecting and re-performing is performed only when at least one of the plurality of cells requires at least one more frequency and there are no frequencies available for use by that cell
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Telecommunications 
