Power control device and method for controlling a reverse link common channel in a CDMA communication system

A method for transmitting a power control command to control a power of a reverse link in a base station for a CDMA communication system, comprising the steps of:

• multiplexing power control commands generated for corresponding multiple subscribers into a power control group;
• and
• spreading the power control group by multiplying the multiplexed power control commands by a spreading sequence, and transmitting the spread and multiplexed power control group via a common power control channel;
• and
• controlling a selector so that the power control commands for the respective subscribers, outputted from the selector, are pseudo-randomly arranged in each power control group;
• and
• independently controlling gains of the power control commands generated for corresponding multiple subscribers.

A channel receiver for a mobile station in a CDMA communication system, comprising:

• a despreader for despreading a spread power control group containing multiple power control commands for multiple mobile stations received from a base station via a common power control channel by multiplying the spread power control group by a spreading sequence, gains of said power control commands for the multiple stations being independently controlled by the base station;
• a demodulator for demodulating the despread signals using received orthogonal code information about the common power control channel;
• a position selector for generating a position select signal based on received positional information about the slot into which the power control command for the mobile station is inserted;
• and
• means for selectively outputting the power control commands according to the position select signal.

A channel receiving device for a mobile station in a CDMA communication system, comprising:

• a despreader for dispreading a received spread signal;
• a first orthogonal code generator for generating a first orthogonal code for demodulating symbol data on a subscriber channel out of the despread signal;
• a second orthogonal code generator for generating a second orthogonal code for demodulating a power control command, out of the despread signal, received from a base station via a common power control channel;
• a first orthogonal demodulator for orthogonally demodulating the despread signal by multiplying the despread signal by an output of the first orthogonal code generator;
• a second orthogonal demodulator for orthogonally demodulating the despread signal by multiplying the despread signal by an output of the second orthogonal code generator;
• a position selector for generating a position select signal;
• a first switch for connecting the first or second orthogonal code to the first or second orthogonal demodulator according to the position select signal;
• and
• a second switch connected to receive outputs of the first and second orthogonal demodulators, for transferring subscriber channel symbol data output from the first orthogonal demodulator to a data combiner or transferring the power control command output from the second orthogonal demodulator to a power control command combiner according to the position select signal.

A channel receiving device for a mobile station in a CDMA communication system, comprising:

• a despreader for despreading a spread power control group containing power control commands for multiple mobile stations received from a base station via a common power control channel to control a power of a reverse link common channel, by multiplying the received power control group by a spreading sequence, gains of said power control commands for the multiple mobile stations being independently controlled by the base station;
• a demodulator for demodulating the despread signals using received orthogonal code information about the common power control channel;
• a position selector for generating a position select signal based on received positional information about the slot into which the rower control command for the mobile station is inserted;
• a power control command detector for receiving the despread power control group and detecting the received power control commands according to the position select signal;
• and
• a power gain controller for controlling a transmission power of a reverse link common channel using a detected power control command.