Means of increasing capacity in cellular radio (mobile and fixed) systems
First Claim
1. In a cellular radio communications system having a plurality of base stations each for communicating over at least one corresponding tri-cellular region using a plurality of directional beams, the tri-cellular region having three corner excited cells, a method of configuring the plurality of directional beams comprising:
- arranging each of the base stations at the center of the corresponding at least one tri-cellular region;
arranging the plurality of beams across each of the cells such that a pair of beams which reuse a like carrier frequency as each other are disaligned with respect to each other;
selecting at least one of the beams reusing the like carrier frequency; and
restricting usage of the like carrier frequency on the at least one selected beam.
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Accused Products
Abstract
A method of configuring a plurality of directional beams in a cellular radio system having a plurality of antennas each communicating over a corresponding respective cell area by re-arrangement of directional beams using a same or like carrier frequency to each other, so as to be directed away from each other, and by restricting signal loading on beams experiencing worst case interference. Interference between geographically close cells is reduced by the method resulting in an improvement in carrier to interference ratio performance. Carrier frequencies of the inner two beams transmitted by an antenna are exchanged for the inner two beams which are transmitted in substantially the same direction by another antenna. Inner beams experiencing highest interference are restricted so as to operate at below their maximum signal load in order to reduce interference within the network. This results in an improved carrier to interference performance for all beams and may allow increased use of a lower frequency reuse factor. The techniques disclosed are applicable to center-excited or corner excited (tri-cellular) systems.
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Citations
20 Claims
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1. In a cellular radio communications system having a plurality of base stations each for communicating over at least one corresponding tri-cellular region using a plurality of directional beams, the tri-cellular region having three corner excited cells, a method of configuring the plurality of directional beams comprising:
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arranging each of the base stations at the center of the corresponding at least one tri-cellular region; arranging the plurality of beams across each of the cells such that a pair of beams which reuse a like carrier frequency as each other are disaligned with respect to each other; selecting at least one of the beams reusing the like carrier frequency; and restricting usage of the like carrier frequency on the at least one selected beam. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cellular radio system comprising a plurality of base stations each for communicating over at least one corresponding tri-cellular region using a plurality of directional beams, the at least one tri-cellular region having three corner excited cells, the base stations being arranged at the center of the corresponding at least one tri-cellular region, and the plurality of base stations operating to:
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arrange the plurality of beams across each of the cells such that a pair of beams which reuse a like carrier frequency as each other are disaligned with respect to each other; select at least one of the beams reusing the like carrier frequency; and restrict usage of the like carrier frequency on the at least one selected beam.
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9. In a cellular radio communications system having a plurality of base stations each for communicating over at least one corresponding tri-cellular region using a plurality of directional beams, the tri-cellular region having three corner excited cells, a method of configuring the directional beams comprising:
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arranging each of the base stations at the center of the corresponding at least one tri-cellular region; arranging the plurality of beams across each of the cells such that individual ones of the beams that reuse a like carrier frequency as each other are disaligned with respect to each other; and
restricting usage of the like carrier frequency on selected ones of the plurality of beams. - View Dependent Claims (10, 11, 13)
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12. A cellular radio communications system comprising:
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a plurality of base stations each for communicating over at least one corresponding tri-cellular region using a corresponding plurality of directional beams, the tri-cellular region having three corner excited cells; a common pool of carrier frequencies for the directional beams such that like carrier frequencies are reused as between different ones of the base stations, wherein usage of at least one of the like carrier frequencies is restricted and wherein beams from different ones of the base stations having the like carrier frequencies are disaligned with respect to each other.
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14. A method for improving the carrier to interference ratio of a cellular radio communications system, comprising:
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arranging a plurality of base stations each for communicating over a corresponding tri-cellular region through the use of a plurality of directional beams, the tri-cellular region having three corner excited cells; arranging the plurality of beams across each of the cells such that a pair of beams which reuse a like carrier frequency are disaligned with each other; selecting at least one of the beams reusing a like carrier frequency; and restricting usage of the like carrier frequency on the at least one selected beam. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification