Apparatus and method for controlling a base station transmitted forward power in a mobile communications system

• US 6,226,502 B1
• Filed: 12/23/1998
• Issued: 05/01/2001
• Est. Priority Date: 12/27/1997
• Status: Expired due to Term

• Current Assignee: Transpacific Bluetooth LLC (Intellectual Ventures LLC)
• Original Assignee: SK Hynix Inc.
• Inventors: Chung, Chae-Hun
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US09/220,231
• Time in Patent Office: 860 Days
• Field of Search: 455/118, 455/117, 455/13.4, 455/20, 455/24, 455/68, 455/69, 455/71, 455/125, 455/522, 455/127, 455/572, 455/574, 455/88, 455/232, 455/249.1
• US Class Current: 455/118
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

A base station transmitted forward power is controlled in such a manner that identifies a mode of an input base station transmitted forward power control command; and controls an attenuation value of an attenuator in a power adjustment part according to a result of the identification so as to gradually increase or decrease a base station transmitted power, thereby effecting the base station transmitted forward power control without deterioration of speech quality and interruption of calls.

Claims

1. An apparatus for controlling a base station transmitted forward power in a mobile communication system, the apparatus having a frequency up-converting part for converting intermediate frequency signals into ultra high frequency (UHF) signals and a power amplifying part for amplifying a power of the UHF signals, the apparatus comprising:

a radio frequency control part for controlling up-conversion of frequency and generating a control signal for adjustment of an attenuation value, said radio frequency control part having a memory for storing data of attenuation values of a power adjustment part; and

a power adjustment part for adjusting a power amplification rate so as to gradually amplify a power of up-converted data of said frequency up-converting part according to the attenuation adjustment control signal of said radio frequency control part and transmitting the data from said frequency up-converting part to said power amplifying part.

2. An apparatus according to claim 1, wherein said power adjustment part comprises:

a digital to analog (D/A) converter for converting said attenuation adjustment control signal of said radio frequency control part into an analog signal and applying voltage to an attenuator;

an attenuator which is controlled to have an attenuation value adjusted according to said analog signal of said D/A converter, for adjusting the power amplification rate an transmitting the up-converted data from said frequency up-converting part to said power amplifying part so as to allow the power to be amplified in accordance with said power amplification rate adjusted;

an analog to digital (A/D) converter for reading and converting the attenuation value of said attenuator into a digital signal before outputting it to said radio frequency control part; and

a memory for storing voltages and corresponding attenuation values which are data of said attenuator in the form of a map.

3. A method of controlling a base station transmitted forward power in a mobile communication system, for controlling a base station transmitted forward power controlling apparatus which includes a power adjustment part for adjusting a power amplification rate to make the power be gradually amplified and transmitting data from a frequency up-converting part to a power amplifying part, the method comprising the steps of:

(a) registering an activation, a partial activation, and an inactivation modes in a mode of a base station transmitted forward power control command;

(b) once the base station transmitted forward power control command is inputted, identifying the mode of said base station transmitted forward power control command; and

(c) controlling an attenuation value of an attenuator in said power adjustment part according to a result of identifying said forward power control command mode so as to gradually increase or decrease a base station transmitter power, thereby effecting the base station transmitted forward power control.

4. A method according to claim 3, wherein said controlling step (c) comprises:

activation mode performing step of gradually increasing a transmission power from a minimum value to a maximum value by controlling the attenuation value of said attenuator when said forward power control command mode is identified as the base station activation mode, thus activating the base station;

partial activation mode performing step of gradually increasing a transmission power from a current value to a maximum value by controlling the attenuation value of said attenuator when said forward power control command mode is identified as the base station partial activation mode, thus partial-activating the base station; and

inactivation mode performing step of gradually decreasing a transmission power from a current value to a minimum value by controlling the attenuation value of said attenuator when said forward power control command mode is identified as the base station inactivation mode, thus inactivating the base station.

5. A method according to claim 4, wherein said activation mode performing step comprises the steps of:

setting an execution time, an attenuation width, and a final activating attenuation value through a base station management part and transmitting a base station activation command to a radio frequency control part;

storing said set execution time, attenuation width, and final activating attenuation value in a memory of said radio frequency control part, adjusting the attenuation value of said attenuator to the maximum value according to said base station activation command, and delaying time by said preset execution time;

after the time delay by said execution time, comparing a value obtained by subtracting said preset attenuation width from the current attenuation value of said attenuator with said preset final activating attenuation value;

when said value obtained by subtracting said preset attenuation width from said current attenuation value of said attenuator exceeds said preset final activating attenuation value, reducing said current attenuation value of said attenuator by said preset attenuation width and going back to said step of delaying the time by said execute on time; and

when said value obtained by subtracting said preset attenuation width from said current attenuation value of said attenuator is equal to or less than said preset final activating attenuation value, adjusting said attenuation value of said attenuator to said value obtained through the subtraction, establishing said obtained attenuation value as a new final activating attenuation value, and reporting to said base station management part that the base station activation has been successfully effected through gradual increase of the transmission power.

6. A method according to claim 4, wherein said partial activation mode performing step comprises the steps of:

setting an execution time, an attenuation width, and a final activating attenuation value through a base station management part and transmitting a base station partial activation command to a radio frequency control part;

storing said set execution time, attenuation width, and final activating attenuation value in a memory of said radio frequency control part, going to the partial activation mode according to said base station partial activation command and reading a current attenuation value of said as attenuator, and delaying time by said set execution time;

after the time delay by said execution time, comparing a value obtained by subtracting said set attenuation width from said current attenuation value of said attenuator with said set final activating attenuation value;

when said value obtained by subtracting said set attenuation width from said current attenuation value of said attenuator exceeds said set final activating attenuation value, reducing said attenuation value of said attenuator by said set attenuation width and going back to said step of delaying the time by said execution time; and

when said value obtained by subtracting said set attenuation width from said current attenuation value of said attenuator is equal to or less than said set final activating attenuation value, adjusting said attenuation value of said attenuator to said value obtained through the subtraction, establishing said obtained value as the final activating attenuation value, and reporting to said base station management part that the base station partial activation has been successfully effected through gradual increase of the transmission power.

7. A method according to claim 4, wherein said inactivation mode performing step comprises the steps of:

setting an execution time, an attenuation width, and a final inactivating attenuation value and transmitting a base station inactivation command to a radio frequency control part;

storing said set execution time, attenuation width, and final inactivating attenuation value in a memory of said radio frequency control part, reading a current attenuation value of said attenuator according to said base station inactivation command, and delaying time by said set execution time;

after the time delay by said execution time, comparing a value obtained by adding said set attenuation width to said current attenuation value of said attenuator with said set final inactivating attenuation value;

when said value obtained by adding said set attenuation width to said current attenuation value of said attenuator is less than said set final inactivating attenuation value, increasing said attenuation value of said attenuator by said set attenuation width and going back to said step of delaying the time by said execution time; and

when said value obtained by adding said set attenuation width to said current attenuation value of said attenuator is equal to or greater than said set final inactivating attenuation value, adjusting said attenuation value of said attenuator to said value obtained through the adding, establishing said obtained value as a new final inactivating attenuation value, and reporting to said base station management part that the base station inactivation has been successfully effected through gradual reduction of the transmission power.