Patent ID: 6745034
Filing Date: 2004-06-01
Classification: H04W

Abstract:
In a radio communication system in which a mobile station is operable to communicate with a serving fixed-site communication station and to communicate with a target fixed-site communication station subsequent to effectuation of a communication hand-off thereto, an improvement of apparatus for facilitating selection of when to initiate the effectuation of the communication hand-off, said apparatus comprising:a movement determiner coupled to receive indications of differences between signal indicia associated with signals generated by the serving fixed-site communication station, signal indicia associated with signals generated by the target fixed-site communication station, said movement determiner selectably operable at least when the indications of the differences are beyond a first threshold set to determine movement indicia associated with the mobile station, the first threshold set formed of a first upper bound value and a first lower bound value; a second threshold set calculator coupled to receive indications of the movement indicia determined by said movement determiner, the movement indicia determined by said movement determiner when the indications of the differences are beyond the first threshold set, said second threshold set calculator for calculating second threshold set values when the movement indicia indicates selected movement of the mobile station, the second threshold set values formed of a second upper bound value and a second lower bound value; a second-threshold-set comparator coupled to receive indications of the second threshold set values and indications of the differences between the signal indicia associated with the signals generated by the serving and the target fixed-site transceivers, respectively, said second-threshold-set comparator for comparing the differences between the signal indicia and the second threshold set values, said second-threshold-set comparator selectably operable at least when the indications of the differences are beyond the first threshold set; and a handoff request selector coupled to said second-threshold set comparator, said handoff request selector for selectably requesting handoff of communications to the target fixed-site communication station responsive to comparisons made by said second-threshold-set comparator.