System and method for frequency reuse in a four cell plan
AssigneeEricsson Inc.
InventorTom Mao
Life of this patent
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Abstract
A telecommunications system and method for a frequency re-use plan is disclosed which reduces the adjacent channel interference between cells, while maintaining good co-channel interference in a four cell frequency reuse plan with a center-excited three sector directional pattern. This can be accomplished by structuring the four cell frequency reuse plan such that no adjacent cells use adjacent channels. As a result, the adjacent channel interference can be minimized, the radio coverage can be extended and in-building penetration can be improved.
Claims18
A telecommunications system for reducing the adjacent channel interference between adjacent ones of a plurality of cells within a frequency reuse plan, said telecommunications system comprising:
- a plurality of cell clusters, each said cell cluster comprising four cells, each of said cells having a substantially hexagon shape and three sectors, each of said sectors having a substantially rhombus shape;
- and
- a plurality of base stations, each said cell having a respective one of said base stations substantially centrally located therein, each of said base stations having three antenna-pointing azimuths associated therewith, each of said sectors within each of said cells having a respective one of said antenna-pointing azimuths associated therewith, a first one of said antenna-pointing azimuths being points about sixty degrees from north along a north-south axis, a second one of said antenna-pointing azimuths being pointed about one hundred eighty degrees from north along said north-south axis, and a third one of said antenna-pointing azimuths being pointed about three hundred degrees from north along said north-south axis.
A method for planning a cell cluster layout which reduces the adjacent channel interference between adjacent ones of a plurality of cells within a telecommunications system, each said cell having a respective one of a plurality of base stations substantially centrally located therein, said method comprising the steps of:
- establishing three antenna-pointing azimuths associated with said each base station, four of cells comprising a cell cluster, each of said cells having a substantially hexagon shape and three sectors, each of said sectors having a substantially rhombus shape, each of said sectors within each of said cells having a respective one of said antenna pointing azimuths associated therewith;
- pointing a first one of said antenna-pointing azimuths for each said base station about sixty degrees from north along a north-south axis;
- pointing a second one of said antenna-pointing azimuths for each said base station about one hundred eighty degrees from north along said north-south axis;
- and
- pointing a third one of said antenna-pointing azimuths for each said base station about three hundred degrees from north along said north-south axis.
Dependencies are inferred from the claim text.