Patent ID: 6647246
Filing Date: 2003-11-11
Classification: H04B,H04W

Abstract:
A method of measuring signal delay between a first station and a second station in a communications system, wherein the distance between the first station and the second station is more than negligible, comprising:transmitting a first signal from the first station to the second station and simultaneously resetting a counting clock in the first station, wherein simultaneously resetting said counting clock comprises providing a first clock to reset said counting clock, said first clock having a period equal to or greater than a delay between the first station and the second station; receiving a delayed first signal at the second station; transmitting said delayed first signal to the first station; receiving a further delayed first signal at the first station and simultaneously stopping said counting clock; calculating the number of counts elapsed in said counting clock between said resetting and said stopping of said counting clock, wherein each count of said counting clock equals the period of said counting clock; and multiplying said number of counts with the period of said counting clock.