Wind-up power control method and apparatus in mobile communications system

• US 20060160557A1
• Filed: 01/18/2006
• Published: 07/20/2006
• Est. Priority Date: 01/19/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chang, Seok-ll
• Granted Patent: US 7,620,414 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/362 Aspects of the step size

Abstract

A power control method in a mobile communication system, which includes changing an original step size for adjusting a target quality of service (QoS) of a downlink channel to a larger step size when a wind-up power control process is released, and adjusting the target QoS using the changed step size when the wind-up is released.

Claims

1. A power control method in a mobile communication system, the method comprising:

changing an original step size for adjusting a target quality of service (QoS) of a downlink channel to a larger step size when a wind-up power control process is released; and

adjusting the target QoS using the changed larger step size when the wind-up power control process is released.

2. The method of claim 1, wherein the target QoS of the downlink channel is fixed when the wind-up power control process is initiated.

3. The method of claim 2, wherein the target QoS indicates a target signal to interference ratio (sir) of the downlink channel.

4. The method of claim 1, wherein adjusting the target QoS decreases the target QoS.

5. The method of claim 1, wherein the step size indicates a down step size.

6. The method of claim 1, wherein adjusting the target QoS is performed while an error does not occur in the downlink channel after the wind-up power control process is released.

7. The method of claim 6, further comprising:

restoring the changed larger step size to the original step size when an error occurs in the downlink channel.

8. The method of claim 7, further comprising:

transmitting power control (tpc) information from a mobile terminal to a base station requesting the base station increase its transmit power for the downlink channel until the target QoS is reached, after restoring the changed larger step size to the original step size; and

decreasing the target QoS using the restored step size when a measured target QoS is greater than the target QoS.

9. The method of claim 8, further comprising:

initiating the wind up power control process when a number of times the tpc information has been transmitted from the mobile terminal to the base station is equal to or larger than a set number for a particular time period.

10. The method of claim 9, wherein the changed larger step size is identical to an up step size used to request the base station increase its transmission power for the downlink channel.

12. The mobile terminal of claim 10, wherein the target QoS of the downlink channel is fixed when the wind-up power control process is initiated.

13. The mobile terminal of claim 12, wherein the target QoS indicates a target signal to interference ratio (sir) of the downlink channel.

14. The mobile terminal of claim 10, wherein by adjusting the target QoS, the controller decreases the target QoS.

15. The mobile terminal of claim 10, wherein the step size indicates a down step size.

16. The mobile terminal of claim 10, wherein the controller adjusts the target QoS while an error does not occur in the downlink channel after the wind-up power control process is released.

17. The mobile terminal of claim 16, wherein the controller restores the changed larger step size to the original step size when an error occurs in the downlink channel.

18. The mobile terminal of claim 17, wherein the controller transmits power control (tpc) information to the base station via the antenna requesting the base station increase its transmit power for the downlink channel until the target QoS is reached after restoring the changed larger step size to the original step size, and decreases the target QoS using the restored step size when a measured target QoS is greater than the target QoS.

19. The mobile terminal of claim 18, wherein the controller initiates the wind up power control process when a number of times the tpc information has been transmitted from the mobile terminal to the base station is equal to or larger than a set number for a particular time period.

20. The mobile terminal of claim 19, wherein the changed larger step size is identical to an up step size used to request the base station increase its transmission power for the downlink channel.

11. A mobile terminal, comprising:

an antenna configured to transmit and receive data to and from a base station controlling the mobile terminal; and

a controller configured to change an original step size for adjusting a target quality of service (QoS) of a downlink channel from the base station to the mobile terminal to a larger step size when a wind-up power control process is released,

wherein the controller adjusts the target QoS using the changed larger step size when the wind-up power control process is released.