Reverse power control method in a cellular system
AssigneeSamsung Electronics Co., Ltd.
InventorsGun-yeob Kim, Pyeong-hwan Wee
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Abstract
The present invention discloses a method for improving a call quality by increasing the output of a mobile station over the reverse link by adjusting threshold range of a system's predetermined E.sub.b /N.sub.o value in the event that the transmission output of the mobile station is stopped in a reverse power control of a cellular system, and by comparing the measured E.sub.b /N.sub.o ratio to a predetermined threshold E.sub.b /N.sub.o ratio to increase/decrease the mobile station transmit power. The method includes steps of adjusting the predetermined threshold E.sub.b /N.sub.o ratio by monitoring the call quality in a forward frame, and repeatedly increasing/decreasing the mobile station transmit power accordingly.
Claims15
A method for controlling a power output level from a mobile station to a base station in a cellular system, said method comprising the steps of:
- (i) setting a predetermined threshold E.sub.b /N.sub.o ratio having a maximum value and a minimum value in said system parameters;
- (j) measuring a E.sub.b /N.sub.o ratio from said mobile station;
- (k) comparing said measured E.sub.b /N.sub.o ratio with said predetermined threshold E.sub.b /N.sub.o ratio;
- (l) in the event that said measured E.sub.b /N.sub.o ratio is greater than said predetermined threshold E.sub.b /N.sub.o ratio, ordering said mobile station to decrease its transmit power;
- (m)in the event that said measured E.sub.b /N.sub.o ratio is not greater than said predetermined threshold E.sub.b /N.sub.o ratio, ordering said mobile station to increase its transmit power;
- (n) detecting the signal quality in a forward link to determine whether a good frame is received in one frame duration;
- (o) in the event that said good frame is not received in said one frame duration, returning to said step (b) of measuring the value of E.sub.b /N.sub.o from a mobile until said good frame is received in said one frame duration;
- and,
- (p) in the event that said good frame is received in said one frame duration, measuring a new E.sub.b /N.sub.o ratio and establishing said newly measured E.sub.b /N.sub.o value as a new predetermined threshold E.sub.b /N.sub.o ratio and returning to said step (b).
A method for controlling a power output level from a mobile station to a base station in a cellular system, said method comprising the steps of:
- (a) measuring E.sub.b /N.sub.o ratio received from each mobile station in a demodulator of base station;
- (b) comparing said measured value with a predetermined threshold E.sub.b /N.sub.o ratio at a predetermined time interval;
- (c) if said measured ratio is greater than said predetermined threshold ratio, ordering said mobile station to decrease power by 1 dB;
- (d) if said measured ratio is not greater than said predetermined threshold ratio, ordering said mobile station to increase the power by 1 dB;
- (e) in event that said mobile station receives a power control bit from two or more said base stations during a handoff, increasing the transmission power of said mobile station if all received said power control bits are `0`, and decreasing the transmission power of said mobile station if at least one bit having a value of `1` among said received power control bits is detected.
A method for controlling a power output level from a mobile station to a base station in a cellular system, said method comprising the steps of:
- (a) receiving a signal by a base station;
- (b) setting a predetermined threshold E.sub.b /N.sub.o ratio having a maximum value and a minimum value in said system parameters;
- (c) measuring a E.sub.b /N.sub.o ratio from said mobile station;
- (d) comparing said measured E.sub.b /N.sub.o ratio with said predetermined threshold E.sub.b /N.sub.o ratio;
- (e) in the event that said measured E.sub.b /N.sub.o ratio is greater than said predetermined threshold E.sub.b /N.sub.o ratio, ordering said mobile station to decrease its transmit power;
- (f) in the event that said measured E.sub.b /N.sub.o ratio is not greater than said predetermined threshold E.sub.b /N.sub.o ratio, ordering said mobile station to increase its transmit power;
- (g) detecting the signal quality in a forward link to determine whether a good frame is received in one frame duration;
- (h) in the event that said good frame is not received in said one frame duration, returning to said step (c) of measuring the value of E.sub.b /N.sub.o from a mobile until said good frame is received in said one frame duration;
- and,
- (i) in the event that said good frame is received in said one frame duration, measuring a new E.sub.b /N.sub.o ratio and establishing said newly measured E.sub.b /N.sub.o value as a new predetermined threshold E.sub.b /N.sub.o ratio and returning to said step (c).
Dependencies are inferred from the claim text.