Enhanced worst case cell elimination in zone paging within a cellular communication system
First Claim
1. A method for minimizing the paging load in a multicell wireless telephone network comprising the steps of:
- (a) determining a cell C in the cellular telephone network having a maximum paging load W thereon;
(b) identifying zones in which cell C is located;
(c) of the zones in which cell C is located, determining a zone P that reduces paging load in cell C the most and that increases the paging load in other cells of the network the least;
(d) tentatively removing cell C from zone P and storing the identity of removed cell C in conjunction with zone P;
(e) determining a maximum paging load W'"'"' based upon all previous tentative cell removals included;
(f) when W exceeds W'"'"', permanently executing all tentative cell removals and repeating steps (a) through (e); and
(g) when W does not exceed W'"'"', selecting a new cell C with a maximum paging load thereon based upon all previous tentative cell removals and repeating steps (b) through (f).
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Accused Products
Abstract
A method for reducing the paging load in a cellular communication system is described. The cell C with the largest paging load L is first identified. Since this cell is usually included in more than one paging zone, the paging zones including cell C are identified. Thereafter, cell C is removed tentatively from each identified zone and a ratio R calculated which represents the decrease in loading on cell C due to being removed from zone z divided by the maximum increase in loading on any other cell in the network. The zone for which the ratio R is the largest is the best candidate for removing cell C therefrom. After doing so tentatively, the cell C'"'"' with the largest paging load L'"'"' thereon is identified. If the loading L is greater than L'"'"', cell G is removed permanently from the zone having the highest ratio R therefor and the process is repeated until L'"'"' is greater than L at which point the process is stopped without removing cell C from the zone with the highest ratio R. In another operation, cell C, a largest paging load L, and a most favorable zone P from which to remove cell C are first identified. Cell C is then tentatively removed from zone P and the identities of Cell C and zone P stored. Should the removal reduce overall paging load, cell C is removed from zone P. If not, operation continues by identifying new cell C and zone P, performing a tentative removal of cell C from zone P and storing such tentative removal. Such operations continue until the overall paging load decreases, at which point all stored cells C are removed from stored zones P. Should paging load cease to improve until a terminating condition is satisfied, none of the stored cells C are removed and operation ends.
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Citations
24 Claims
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1. A method for minimizing the paging load in a multicell wireless telephone network comprising the steps of:
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(a) determining a cell C in the cellular telephone network having a maximum paging load W thereon; (b) identifying zones in which cell C is located; (c) of the zones in which cell C is located, determining a zone P that reduces paging load in cell C the most and that increases the paging load in other cells of the network the least; (d) tentatively removing cell C from zone P and storing the identity of removed cell C in conjunction with zone P; (e) determining a maximum paging load W'"'"' based upon all previous tentative cell removals included; (f) when W exceeds W'"'"', permanently executing all tentative cell removals and repeating steps (a) through (e); and (g) when W does not exceed W'"'"', selecting a new cell C with a maximum paging load thereon based upon all previous tentative cell removals and repeating steps (b) through (f). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for minimizing the paging load in a multicell wireless telephone network comprising the steps of:
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(a) determining the probability P(i,j), for all cells in the network that a given mobile is in cell j given the fact that its last known position was zone i and order the list of probabilities P(i,j) from largest to smallest; (b) defining a plurality of paging zones Z(i) for each cell i in the network, each particular cell k being included in the zone Z(i) if the following inequality is true;
space="preserve" listing-type="equation">k+(1-(P(i,j)+P(i,j.sub.2)+ . . . +P(i,j.sub.k)))*n<
=k-1+(1-(P(i,j.sub.1)+P(i,j.sub.2)+ . . . +P(i,j.sub.k-1)))*nand the order of successive probabilities used in the inequality is defined by said ordered list of probabilities P(i,j); (c) determining a cell C in the cellular telephone network having a maximum paging load W thereon; (d) identifying zones in which cell C is located; (e) of the zones in which cell C is located, determining a zone P that reduces paging load in cell C the most and that increases the paging load in other cells of the network the least; (f) tentatively removing cell C from zone P and storing the identity of removed cell C in conjunction with zone P; (g) determining a maximum paging load W'"'"' based upon all previous tentative cell removals included; (h) when W exceeds W'"'"', permanently executing all tentative cell removals and repeating steps (c) through (g); and (i) when W does not exceed W'"'"', selecting a new cell C with a maximum paging load thereon based upon all previous tentative cell removals and repeating steps (d) through (h). - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification