Method and apparatus of forward traffic channel power control for CDMA wireless local loop system

Claim 1

A method of controlling a forward traffic channel transmission power for lowering a forward link interference signal caused by adjacent cells and providing a good communication quality in a code division multiple access (CDMA) wireless local loop system, comprising the steps of: a. receiving a bit-energy/noise ratio of forward traffic channels, the bit-energy/noise ratio being measured and reported by mobile stations; b. determining whether a total power allocated in all forward channels managed by a base station is in a normal mode, at which the total power is lower than a predetermined power threshold value, or in a threshold mode, at which the total power is at the predetermined power threshold value; c. comparing the bit-energy/noise ratio of step a with a target bit-energy/noise ratio for determining a difference between the the bit-energy/noise ratio and the target bit-energy/noise ratio and adjusting the forward traffic channel transmission power in response to the difference if the normal mode is determined in step b; and d. comparing the bit-energy/noise ratio of step a with a target bit-energy/noise ratio for determining a difference between the the bit-energy/noise ratio and the target bit-energy/noise ratio and adjusting the forward traffic channel transmission power using predetermined values in response to the difference if the threshold mode is determined in step b.

Claim 2

A method of controlling a forward traffic channel transmission power for lowering a forward link interference signal caused by adjacent cells and providing a good communication quality in a code division multiple access (CDMA) wireless local loop system, comprising the steps of: a. receiving a bit-energy/noise ratio of forward traffic channels, the bit-energy/noise ratio being measured and reported by mobile stations; b. determining whether a total power allocated in all forward channels managed by a base station is in a normal mode, at which the total power is lower than a predetermined power threshold value, or in a threshold mode, at which the total power is at the predetermined power threshold value; c. comparing the bit-energy/noise ratio of step a with a target bit-energy/noise ratio for determining a difference between the the bit-energy/noise ratio and the target bit-energy/noise ratio and adjusting the forward traffic channel transmission power in response to the difference if the normal mode is determined in step b; and d. comparing the bit-energy/noise ratio of step a with a target bit-energy/noise ratio for determining a difference between the the bit-energy/noise ratio and the target bit-energy/noise ratio and adjusting the forward traffic channel transmission power using predetermined values in response to the difference if the threshold mode is determined in step b.

Claim 7

An apparatus for controlling a forward traffic channel transmission power of a code division multiple access (CDMA) wireless local loop system, comprising: a mobile station receiver for receiving a traffic information signal containing traffic information data transmitted from a base station via a traffic channel; a mobile station traffic channel demodulator for demodulating the received traffic information data by performing an inverse spread spectrum process, thereby obtaining the received traffic information data from the traffic channel; a receiving bit-energy/noise ratio measuring portion of a mobile station forward traffic channel for measuring a bit-energy/noise ratio of the traffic channel from the demodulated received traffic information data; a mobile station modulator for digitally modulating the bit-energy/noise ratio of the traffic channel; a mobile station transmitter for transmitting the modulated bit-energy/noise ratio signal to the base station; a base station receiver for receiving the modulated bit-energy/noise ratio signal from the mobile station wherein a total power allocated in all forward channels managed by said base station is in a normal mode, at which the total power is lower than a predetermined threshold value, or in a threshold mode, at which the total power is at the predetermined power threshold value; a base station digital demodulator for base band digitally demodulating the received modulated bit-energy/noise ratio signal; a base station decoder for determining whether there is an error in the demodulated bit-energy/noise ratio signal; means for determining and controlling a base station transmission power which receives the information after an error check, compares the bit-energy/noise ratio measured by the mobile station with a target value of the forward traffic channel power control, determines whether to increase or decrease a power of the forward traffic channel based on whether the base station is in the normal mode or threshold mode and controls a transmission power of the traffic channel; a base station traffic channel modulator for modulating a traffic information signal with a traffic channel modulation gain corresponding to the base station transmission power determined at the means for determining and controlling the base station transmission power; and a base station transmitter for transmitting the modulated traffic information signal to the mobile station through the traffic channel.

Claim 8

An apparatus for controlling a forward traffic channel transmission power of a code division multiple access (CDMA) wireless local loop system, comprising: a mobile station receiver for receiving a traffic information signal containing traffic information data transmitted from a base station via a traffic channel; a mobile station traffic channel demodulator for demodulating the received traffic information data by performing an inverse spread spectrum process, thereby obtaining the received traffic information data from the traffic channel; a receiving bit-energy/noise ratio measuring portion of a mobile station forward traffic channel for measuring a bit-energy/noise ratio of the traffic channel from the demodulated received traffic information data; a mobile station modulator for digitally modulating the bit-energy/noise ratio of the traffic channel; a mobile station transmitter for transmitting the modulated bit-energy/noise ratio signal to the base station; a base station receiver for receiving the modulated bit-energy/noise ratio signal from the mobile station wherein a total power allocated in all forward channels managed by said base station is in a normal mode, at which the total power is lower than a predetermined threshold value, or in a threshold mode, at which the total power is at the predetermined power threshold value; a base station digital demodulator for base band digitally demodulating the received modulated bit-energy/noise ratio signal; a base station decoder for determining whether there is an error in the demodulated bit-energy/noise ratio signal; means for determining and controlling a base station transmission power which receives the information after an error check, compares the bit-energy/noise ratio measured by the mobile station with a target value of the forward traffic channel power control, determines whether to increase or decrease a power of the forward traffic channel based on whether the base station is in the normal mode or threshold mode and controls a transmission power of the traffic channel; a base station traffic channel modulator for modulating a traffic information signal with a traffic channel modulation gain corresponding to the base station transmission power determined at the means for determining and controlling the base station transmission power; and a base station transmitter for transmitting the modulated traffic information signal to the mobile station through the traffic channel.