Patent ID: 6198930
Filing Date: 2001-03-06
Classification: G01S,H04B,H04W

Abstract:
A method for providing cellular phone handoff between at least two cellzones for a mobile cellphone user, the method comprising the steps of:determining location of a cellphone used by a cellphone user;comparing the cellphone location with a cellzone map, and identifying a first cellzone on the cellzone map in which the cellphone is presently located;identifying a second cellzone that is adjacent to the first cellzone, where the first and second cellzones are separated by a cellzone boundary;when the cellphone location is within the first cellzone, providing cellphone service for the cellphone by a cellphone service provider for the first cellzone, and determining a distance d of the cellphone from the cellzone boundary;when the cellphone location is within the first cellzone, the distance d is less than a selected positive distance d1, and d is decreasing with increasing time, preparing to hand off cellphone service for the cellphone to a cellphone service provider for the second cellzone; andwhen the cellphone location is determined to have passed across the cellzone boundary, providing cellphone service for the cellphone by the cellphone service provider for the second cellzone, when the cellphone location is within the second cellzone.