Patent ID: 6128506
Filing Date: 2000-10-03
Classification: H04W

Abstract:
A method of controlling a communication system having base stations and mobile stations, comprising the steps of:controlling signal transmission power of at least one mobile station in the system based on a signal traffic congestion in the system, wherein the step of controlling signal transmission power comprises:measuring a quality of a signal transmitted from one of the mobile stations to one of the base stations;comparing the measured signal quality with a first threshold value SIR.sup.t ;measuring a received signal power P.sub.r at the one base station;comparing the measured signal power P.sub.r with a second threshold value P.sup.t ; andchanging the signal transmission power of the one mobile station based on the comparisons of the measured signal quality with the first threshold value SIR.sup.t and the measured signal power with the second threshold value P.sub.r ; whereinthe signal transmission power of the one mobile station is increased when a) (SIR.sub.m /SIR.sup.t)<1 and P.sub.r <P.sup.t, or b) (SIR.sub.m /SIR.sup.t)((P.sub.r /P.sup.t))<1 and P.sub.r >P.sup.t, whereSIR.sub.m is a signal to interference ratio measured at the one base station of a signal transmitted from the one mobile station;SIR.sup.t is a predetermined signal to interference ratio threshold value;P.sub.r is a total signal power received at the one base station;P.sup.t is a predetermined total received signal power threshold value; andn is greater than zero; andcontrolling the sign traffic congestion in the system based on the comparison of the measured signal power with the second threshold value P.sup.t, wherein the step of controlling congestion is performed when P.sub.r >P.sup.t and comprises the steps of:selecting a signal transmission between a first mobile station and a first base station;performing at least one of lowering a bit rate of the selected signal transmission, executing an interfrequency handover of the selected signal transmission, and terminating the selected signal mission; andrepeating the steps of selecting and performing until P.sub.r <P.sup.t.