Wireless telecommunications system and method for designing same
First Claim
1. A method for designing a wireless telecommunications system having a plurality of cells, comprising the steps of:
- estimating a channel demand for each cell based on call demands within each cell;
determining a maximum channel demand ω
d among all groups of mutually-interfering cells based on the estimated channel demand for each cell, wherein the interference between mutually-interfering cells is co-channel interference;
calculating a number of communication channels χ
d required to satisfy call demands in all cells of the system according to the expression;
χ
d ≦
17/12·
ω
d when mutually-interfering cells are adjacent cells, and according to the expression χ
d ≦
2·
ω
d -dmin when mutually interfering cells are adjacent cells and next-to-adjacent cells, wherein dmin is a minimum channel demand of all cells in the system;
allotting a band of frequency spectrum for use in the system sufficient to provide the calculated number of communication channels based on a desired channel bandwidth.
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Abstract
A method for designing a wireless telecommunications system having a plurality of cells is provided. In one embodiment of such a method, a call demand per cell is estimated, and a channel demand based thereon is determined on a cell-by-cell basis. The cell-by-cell channel demand is used to provide a reasonably tight upper bound on the number of communication channels required to satisfy the system-wide call demand. It is implicit in the procedure for estimating the upper bound that no mutually "interfering" base stations use the same channel (i.e., frequency). "Cliques" of mutually-interfering base stations or cells are defined. A channel demand is determined for each clique by adding up the channel demand for each cell in the clique. The greatest channel demand of all cliques determines a "maximum clique demand" ωd. The upper bound on the number of channels required to satisfy the system-wide call demand is given by the expression: χd ≦17/12·ωd when mutually-interfering cells are adjacent cells, and is given by the expression: χd ≦2·ωd -dmin when mutually interfering cells are adjacent cells and next-to-adjacent cells, wherein dmin is a minimum channel demand of all cells in the system. Having a reasonably-good estimate of the upper bound on the system-wide channel requirement, a wireless service provider may then seek to obtain or allot a commensurate amount of frequency spectrum to support its system.
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Citations
7 Claims
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1. A method for designing a wireless telecommunications system having a plurality of cells, comprising the steps of:
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estimating a channel demand for each cell based on call demands within each cell; determining a maximum channel demand ω
d among all groups of mutually-interfering cells based on the estimated channel demand for each cell, wherein the interference between mutually-interfering cells is co-channel interference;calculating a number of communication channels χ
d required to satisfy call demands in all cells of the system according to the expression;
χ
d ≦
17/12·
ω
d when mutually-interfering cells are adjacent cells, and according to the expression χ
d ≦
2·
ω
d -dmin when mutually interfering cells are adjacent cells and next-to-adjacent cells, wherein dmin is a minimum channel demand of all cells in the system;allotting a band of frequency spectrum for use in the system sufficient to provide the calculated number of communication channels based on a desired channel bandwidth. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless telecommunications system comprising:
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a first plurality of cells; and a base station situated within each cell, each base station operable to communicate with wireless terminals within the same cell and other base stations in other cells; wherein, the wireless communications system uses a band of frequency spectrum over which intracell communication occurs, which band is segregated into a number of channels sufficient to satisfy system-wide call demand, wherein the number of channels, and hence the band of frequency spectrum, is estimated by; estimating a channel demand for each cell based on call demand within each cell; determining a maximum channel demand ω
d among all groups of mutually-interfering cells based on the estimated channel demand for each cell, wherein the interference between mutually-interfering cells is co-channel interference; andcalculating a number of communication channels χ
d required to satisfy call demands in all cells of the system according to the expression;
χ
d ≦
17/12·
ω
d when mutually-interfering cells are adjacent cells, and according to the expression;
χ
d ≦
2·
ω
d -dmin when mutually interfering cells are adjacent cells and next-to-adjacent cells, wherein dmin is a minimum channel demand of all cells in the system.
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Specification