Cellular network handoff modeling
First Claim
1. A method for evaluating the performance of cellular network handoff decisions comprising the steps of:
- a) creating a reference cellular network description, said reference cellular network description describing;
i) a cellular network geometry;
ii) a signal propagation description;
iii) at least two base stations, each of said at least two base stations having;
(1) a location within said cellular network geometry; and
(2) a pilot signal having a pilot signal strength; and
iv) at least one mobile unit capable of;
(1) moving along a trajectory; and
(2) sampling said pilot signal strength; and
b) creating reduced geometric structures from said reference cellular network description;
c) representing a general trajectory for said mobile unit in said reference cellular network description;
d) approximating said general trajectory with a piecewise path having a multitude of handoff decision points;
e) selecting a handoff mechanism;
f) selecting handoff parameters;
g) creating a discrete-time formulation characterizing handoff behaviors; and
h) calculating at least one handoff performance metric along at least one said handoff decision point.
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Accused Products
Abstract
Disclosed is a system for evaluating the performance of cellular network handoff decisions. One embodiment of this system includes the steps of: creating a reference cellular network description; creating reduced geometric structures from the reference cellular network description; representing a general trajectory for a mobile unit in the reference cellular network description; approximating the general trajectory with a piecewise path having a multitude of handoff decision points; selecting a handoff mechanism; selecting handoff parameters; creating a discrete-time formulation characterizing handoff behaviors; and calculating at least one handoff performance metric. The handoff performance metrics may include assignment probabilities; handoff probabilities; a mean number of handoff value; a crossover point; and overall signaling load incurred by a handoff mechanism.
15 Citations
24 Claims
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1. A method for evaluating the performance of cellular network handoff decisions comprising the steps of:
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a) creating a reference cellular network description, said reference cellular network description describing; i) a cellular network geometry; ii) a signal propagation description; iii) at least two base stations, each of said at least two base stations having; (1) a location within said cellular network geometry; and (2) a pilot signal having a pilot signal strength; and iv) at least one mobile unit capable of; (1) moving along a trajectory; and (2) sampling said pilot signal strength; and b) creating reduced geometric structures from said reference cellular network description; c) representing a general trajectory for said mobile unit in said reference cellular network description; d) approximating said general trajectory with a piecewise path having a multitude of handoff decision points; e) selecting a handoff mechanism; f) selecting handoff parameters; g) creating a discrete-time formulation characterizing handoff behaviors; and h) calculating at least one handoff performance metric along at least one said handoff decision point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A cellular network handoff modeler comprising:
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a) a reference cellular network description generator, capable of generating a reference cellular network description, said reference cellular network description describing; i) a cellular network geometry; ii) a signal propagation description; iii) at least two base stations, each of said at least two base stations having; (1) a location within said cellular network geometry; and (2) a pilot signal having a pilot signal strength; and iv) at least one mobile unit capable of; (1) moving along a trajectory; and (2) sampling said pilot signal strength; and b) a reduced geometric structure creator, capable of creating reduced geometric structures from said reference cellular network description; c) a general trajectory generator, capable of representing a general trajectory for said mobile unit in said reference cellular network description; d) a piecewise path creator capable of approximating said general trajectory with a piecewise path having a multitude of handoff decision points; e) a handoff mechanism selector; f) handoff parameters selector; g) a discrete-time formulation creator capable of characterizing handoff behaviors; and h) a handoff performance metric calculator capable of calculating at least one handoff performance metric along at least one said handoff decision point. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification