Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-03-26
1999-12-07
To, Doris H.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455509, 455 63, H04Q 700
Patent
active
059998199
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" .omega..sup.d. The upper bound on the number of channels required to satisfy the system-wide call demand is given by the expression: .chi..sup.d .ltoreq.17/12.multidot..omega..sup.d when mutually-interfering cells are adjacent cells, and is given by the expression: .chi..sup.d .ltoreq.2.multidot..omega..sup.d -d.sub.min when mutually interfering cells are adjacent cells and next-to-adjacent cells, wherein d.sub.min 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.
REFERENCES:
patent: 5404574 (1995-04-01), Benveniste
patent: 5740536 (1998-04-01), Benveniste
patent: 5778317 (1998-07-01), Kaminsky
patent: 5903842 (1999-05-01), Wang et al.
Khanna Sanjeev
Kumaran Krishnan
Lucent Technologies - Inc.
To Doris H.
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