Adaptive frequency reuse plan
First Claim
1. A method for assigning T number of frequency channels within a cellular telecommunications network having a plurality of cells, wherein N cells are arranged as a cluster, said method comprising the steps of:
- associating C contiguous clusters together as a modified cluster, a plurality of said modified clusters covering a geographic area;
labeling said N cells within each of said C contiguous clusters according to a cell labeling order;
associating cells from two or more clusters having a same cell label as a cell group;
sequentially assigning said T number of frequency channels within each of said plurality of modified clusters; and
reusing, in a first cell in a first cluster, a frequency channel assigned to a second cell within a second cluster, said second cell within the same cell group as said first cell in order to increase capacity within said first cell of said first cluster.
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Abstract
A cell pattern for use with a frequency reuse plan is disclosed. Seven clusters each comprising N cells per cluster are grouped together as a modified cluster. Each cell is further divided into three sectors. The total number of available frequency channels are divided into a F times seven (F*7) number of groups. Frequency channels associated with a group are then assigned to each of the cells within the modified cluster. In order to increase call capacity within a particular sector, a frequency channel previously assigned to a corresponding sector within the same cell group is reused. Within a continuing increase in channel re-usage within a particular modified cluster, the (N*7)/(F*7) reuse plan is gradually lowered to the original N/F reuse plan without re-configuring the frequency allocation throughout the network.
57 Citations
23 Claims
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1. A method for assigning T number of frequency channels within a cellular telecommunications network having a plurality of cells, wherein N cells are arranged as a cluster, said method comprising the steps of:
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associating C contiguous clusters together as a modified cluster, a plurality of said modified clusters covering a geographic area; labeling said N cells within each of said C contiguous clusters according to a cell labeling order; associating cells from two or more clusters having a same cell label as a cell group; sequentially assigning said T number of frequency channels within each of said plurality of modified clusters; and reusing, in a first cell in a first cluster, a frequency channel assigned to a second cell within a second cluster, said second cell within the same cell group as said first cell in order to increase capacity within said first cell of said first cluster. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile telecommunications network for providing radio coverage within a particular geographic area, comprising:
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a plurality of cells, each cell comprising D sectors; a plurality of clusters, each cluster comprising N cells; a plurality of modified clusters, each modified cluster comprising C contiguous clusters; and a T number of frequency channels distributed over and reused within each of said plurality of modified clusters, wherein said T number of frequency channels are reused according to a reuse plan whereby a first frequency channel is reused within a first sector associated with a first cluster, said first frequency channel assigned to a second sector associated with a second cluster wherein the difference in channel numbers assigned to said first sector and said first frequency channel being reused from said second sector is at least D times C. - View Dependent Claims (8, 9, 10)
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11. A cell structure for use with a frequency reuse pattern, comprising:
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a plurality of cells, each cell comprising a plurality of sectors; a plurality of clusters, each cluster comprising an N number of cells from said plurality of cells; a plurality of modified clusters; a T number of frequency channels wherein said T number of frequency channels are divided into F number of frequency groups and distributed over and reused within each of said plurality of modified clusters; a plurality of sub-frequency groups formed from said F number of frequency groups, wherein each of said plurality of sectors is assigned frequency channels associated with one of said plurality of sub-frequency groups; and wherein in order to increase the capacity for a first sector within a first cluster, a frequency channel assigned to a second sector associated with a second cluster is reused within said plurality of modified clusters, the difference in channel numbers between said frequency channels already assigned to said first sector and said channel frequency being reused from said second sector is at least twenty-one. - View Dependent Claims (12)
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13. A method for adaptively changing a first reuse plan to a second reuse plan within a cellular telecommunications network, said method comprising the steps of:
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associating N cells as a cluster; associating a plurality of clusters as a modified cluster; distributing T number of frequency channels within said modified cluster according to said first reuse plan by; assigning a first group of frequency channels to a first cell in a first cluster; and assigning a second group of frequency channels to a second cell in a second cluster, wherein said first group is different from said second group; and reusing, in order to accommodate an increase in call capacity within said first cell, frequency channels from said second group of frequency channels within said first cell to adaptively change to said second reuse plan. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for automatically adapting from a first reuse plan to a second reuse plan within a cellular telecommunications network having a plurality of cells divided into one or more sectors, said method comprising the steps of:
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associating N cells in a predetermined sequence as a cluster; associating M clusters as a modified cluster having M*N cells; associating cells from each of said M clusters having a same respective sequence position as a cell group; distributing T number of frequency channels within said modified cluster such that each of said T number of frequency channels is assigned to only one of said M*N cells in said modified cluster to establish said first reuse plan; adapting from said first reuse plan to said second reuse plan by reusing said T number of frequency channels within said N cell groups to establish said second reuse plan. - View Dependent Claims (20, 21, 22, 23)
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Specification