SYSTEM AND METHOD FOR GEOGRAPHICALLY LOCATING A CELLULAR PHONE
First Claim
1. A method for geographically locating a cellular phone, the method comprising:
- determining an effective cell-area for each of a first cell and a second cell in a cellular network; and
determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell;
wherein the determination of the handover area and the effective cell-area for each of the first cell and the second cell are made based on a topological relationship between the first cell and the second cell.
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Abstract
According to an embodiment of the invention, there is disclosed a method for geographically locating a cellular phone. The method comprises: determining an effective cell-area for each of a first cell and a second cell in a cellular network; and determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell; wherein the determination of the handover area and the effective cell-area for each of the first cell and the second cell are made based on a topological relationship between the first cell and the second cell. Further related apparatus embodiments are also disclosed.
99 Citations
59 Claims
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1. A method for geographically locating a cellular phone, the method comprising:
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determining an effective cell-area for each of a first cell and a second cell in a cellular network; and determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell; wherein the determination of the handover area and the effective cell-area for each of the first cell and the second cell are made based on a topological relationship between the first cell and the second cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus for geographically locating a cellular phone, the apparatus comprising:
- an effective cell-area module for determining an effective cell-area for each of a first cell and a second cell in a cellular network; and
a handover area module for determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell; wherein the determination of the handover area and the effective cell-area for each of the first cell and the second cell are made based on a topological relationship between the first cell and the second cell. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
- an effective cell-area module for determining an effective cell-area for each of a first cell and a second cell in a cellular network; and
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58. A method for geographically locating a cellular phone in a cellular network comprising a first antenna for a first cell and a second antenna for a second cell, the method comprising:
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determining an effective radius Ri for each of a set of i different topological relationships between the first cell and the second cell; determining an angle α
for which, when the first antenna is contained within the second cell, and when an angle β
formed by a line between the first antenna and the second antenna and a sector limit line of the second cell is less than the angle α
, the second cell will be extended beyond the sector limit line;determining a first extension width E1 of a first rectangular extension added to a sector limit line of the second cell when the angle is less than the angle α
;determining a second extension width E2 of a second rectangular extension added to a sector limit line of the second cell when the first antenna is outside the second cell, and when an inner angle formed between a sector limit line of the second cell and a line between the first antenna and the second antenna, is greater than 180 degrees; determining a first penumbra width W1 of a first rectangular strip between a line of equal intensity of signal reception from the first antenna and the second antenna, and a first strip limit proximal to a cell into which the cellular phone is moving; determining a second penumbra width W2 of a second rectangular strip between the line of equal intensity and a second strip limit proximal to a cell out of which the cellular phone is moving; and determining a handover area within which the cellular phone is likely to be located when control of the cellular phone is transferred from the first cell to the second cell, the determination of the handover area being based on at least a subset of the effective radii Ri, the angle α
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the first extension width E1, the second extension width E2, the first penumbra width W1, and the second penumbra width W2.
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59-92. -92. (canceled)
Specification