Automatic control apparatus and method for TD-SCDMA mobile terminal

• US 20040097255A1
• Filed: 11/12/2003
• Published: 05/20/2004
• Est. Priority Date: 11/19/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yu, Jae-Wook
• Granted Patent: US 7,522,550 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

The automatic control system of a mobile terminal for time division duplex (TDD) based communication system includes an RF processing module which controls quality of a transmission channel, and a baseband modem connected to the RF processing module through a transmission data line and a reception data line. The baseband modem generates automatic control signals based on control information received from a base station and transmitting the automatic control signal to the RF processing module through the transmission data line in a reception mode of the mobile terminal. The automatic control signals are transmitted to the RF processing module through the transmission data line, which is in the idle state, in the reception mode. Additional control lines are not required to transmit the respective automatic control signals. Therefore, utilization of the transmit data line between the baseband modem and the RF processing module can be improved.

Claims

1. An automatic control system of a mobile terminal for time division duplex (TDD) based communication system, comprising:

a baseband modem generating automatic control signals based on control information received from a base station and transmitting the automatic control signals to associated elements of the mobile terminal in a reception mode.

2. The system of claim 1, wherein the automatic control signal is an analog signal.

3. The system of claim 2, wherein the automatic control signals are an automatic power control (APC) signal, an automatic gain control (AGC) signal, and an automatic frequency control (AFC) signal.

4. The system of claim 1, wherein the baseband modem comprises:

a converter which converts digital data to be transmitted into analog data, and received analog data into digital data; and

a control unit which controls the converter.

5. The system of claim 1, further comprising an RF processing module which controls quality of a transmission channel based on the automatic control signals from the baseband modem.

6. The system of claim 5, wherein the baseband modem comprises:

a converter which converts digital data to be transmitted into analog data and received analog data into digital data; and

a control unit which controls the converter.

7. The system of claim 6, wherein the RF processing module comprises:

a transmission/reception unit which processes the data received through an antenna of the mobile terminal so as to transmit the data to the baseband modem and which processes the transmission data from the baseband modem so as to transmit the transmission data in the air through the antenna;

an oscillator which generates an oscillating frequency; and

a switch which checks a type of the automatic control signal received from the baseband modem and selectively transmits the signal to the transmission/reception unit and to the oscillator according to the type of the automatic control signal.

8. The system of claim 6, wherein the automatic control signals are an automatic power control (APC) signal, an automatic gain control (AGC) signal, and an automatic frequency control (AFC) signal.

9. The system of claim 8, wherein the APC, AGC, and AFC signals are transmitted to the RF processing module through the transmission data line.

10. The system of claim 9, wherein the switch routes the AFC signal to the oscillator, and routes the APC and AGC signals to the transmission/reception unit.

11. An automatic control system of a mobile terminal for time division duplex (TDD) based communication system, comprising:

an RF processing module which controls quality of a transmission channel; and

a baseband modem connected to the RF processing module through a transmission data line and a reception data line, the baseband modem generating automatic control signals based on control information received from a base station and transmitting the automatic control signal to the RF processing module through the transmission data line in a reception mode of the mobile terminal.

12. The system of claim 11, wherein the baseband modem comprises:

a converter which converts digital data to be transmitted into analog data and converts received analog data into digital data; and

a control unit which controls the converter.

13. The system of claim 12, wherein the RF processing module comprises:

a transmission/reception unit which processes data received through an antenna of the mobile terminal so as to transmit the data to the baseband modem, and which processes transmission data received from the baseband modem so as to transmit the transmission data through the antenna;

an oscillator which generates an oscillating frequency; and

a switch which checks which types of the automatic control signals are received from the baseband modem and selectively transmits the automatic control signals to the transmission/reception unit and the oscillator according to the type of the automatic control signal.

14. The system of claim 13, wherein the automatic control signals are an automatic power control (APC), automatic gain control (AGC), and automatic frequency control (AFC) signals.

15. The system of claim 14, wherein the switch transmits the AFC signal to the oscillator and transmits the APC and AGC signals to the transmission unit.

16. An automatic control method for a time division duplex (TDD) based mobile terminal, comprising:

determining whether the mobile terminal is in a transmission or reception mode;

determining whether or not an automatic control command is received from an upper layer when the mobile terminal is in the reception mode;

generating automatic control signals based on the automatic control command if the automatic control command is received from the upper layer;

transmitting the automatic control signals to an RF processing module; and

setting a quality of a transmission channel based on the automatic control signals.

17. The method of claim 16, wherein the automatic control signals are transmitted through a transmission data line connecting the baseband modem and the RF processing unit.

18. The method of claim 17, wherein the automatic control signals are transmitted to the RF processing module before the mobile terminal enters the reception mode.

19. The method of claim 18, wherein the automatic control signals are an automatic power control (APC), automatic gain control (AGC), and automatic frequency control (AFC) signals.

20. The method of claim 19 further comprises determining the types of the automatic control signals.

21. The method of claim 20, wherein the automatic control signals are routed to associated elements of the transmission/reception unit if the automatic control signal is the APC or AGC signal, and routed to the oscillator if the automatic control signal is the AFC signal.

22. An automatic control system for a time division duplex (TDD) based communication system, comprising:

a modem generating control signals based on received control information and transmitting the control signals to receiving elements in a reception mode.

23. The system of claim 22, wherein the control signals are a power control signal, a gain control signal, and a frequency control signal.

24. An automatic control method for a time division duplex (TDD) based communication system, comprising:

determining whether the communication system is in a transmission or reception mode;

determining whether or not a control command is received from an upper layer when the communication system is in the reception mode;

generating control signals based on the control command if the control command is received from the upper layer;

transmitting the control signals to an RF processing module; and

setting quality of a transmission channel based on the control signals.

25. The system of claim 24, wherein the control signals are a power control signal, a gain control signal, and a frequency control signal.