Adaptive down bias to power changes for controlling random walk

• US 20060223447A1
• Filed: 03/31/2005
• Published: 10/05/2006
• Est. Priority Date: 03/31/2005
• Status: Abandoned Application

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Nabhane, Walid E., Pauls, Richard J., Salvarani, Alexandro, Weaver, Carl F., Masoomzadeh-Fard, Ali, Meyers, Martin H.
• Application Number:
  US11/096,200
• Publication Number:
  US 20060223447A1
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/362 Aspects of the step size

Abstract

A wireless communication network (20) utilizes a down bias to minimize or eliminate random walk when controlling a transmit power between a base station (38) and a mobile station (40). In a disclosed example, a link quality monitoring module (54) determines the quality of a link between the mobile station (40) and the base station (38). A power control module (52) applies a down bias, which is dependent on the determined link quality, to a transmit power correction for minimizing random walk. In a disclosed example, the down bias varies linearly and inversely proportionally to the quality of the link between the mobile station and the base station.

Claims

1. A method of communicating between at least one base station and at least one mobile station, comprising:

applying a down bias, based upon a quality of a link between the mobile station and the base station, to a transmit power correction for the link.

2. The method of claim 1, comprising determining the quality of the link based on at least one quality metric.

3. The method of claim 2, comprising determining the quality metric from at least one signal received from the mobile station.

4. The method of claim 2, comprising determining the down bias dependent on the determined quality of the link.

5. The method of claim 1, comprising applying a first down bias if the quality of the link is at a first level and applying a second, lower down bias if the quality of the link is at a second, higher level.

6. The method of claim 5, comprising varying the down bias linearly relative to the quality of the link.

7. The method of claim 6, comprising varying the down bias inversely proportionally to the quality of the link.

8. The method of claim 5, wherein the first level is below a first selected quality threshold and the first down bias is a maximum down bias and the second, higher level is above a second, higher selected quality threshold and the second down bias has no effect on the transmit power correction.

9. The method of claim 1, comprising

receiving a power control command from the mobile station;

determining the quality of the link;

determining the down bias corresponding to the quality of the link; and

applying the down bias to the transmit power correction that is responsive to the received power control command.

10. The method of claim 1, comprising:

selecting a link quality range;

applying a maximum down bias if the quality of the link is below the quality range;

applying a minimum down bias if the quality of the link is above the quality range; and

applying a down bias that varies according to the quality of the link if the quality of the link is within the quality range.