Systems and techniques for channel gain computations

• US 20040110525A1
• Filed: 06/16/2003
• Published: 06/10/2004
• Est. Priority Date: 12/14/2001
• Status: Abandoned Application

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Black, Peter J., Sindhushayana, Nagabhushana, Challa, Raghu, Attar, Rashid
• Application Number:
  US10/463,188
• Publication Number:
  US 20040110525A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets

Abstract

Systems and techniques for controlling transmission power involve receiving a first to second channel power ratio, receiving a first to second channel power ratio, adjusting the power ratio if a combined power of a plurality of channels exceeds a threshold, the channels including the first and second channels, and computing gain of the first channel as a function of the power ratio.

Claims

1. A method for reducing power ratios of a data rate control (DRC) channel and an acknowledgment (ACK) channel, comprising:

enabling a DRC power loop, wherein a DRC backoff value is reduced to incrementally reduce a DRC to pilot channel power ratio if a total power of traffic channels exceeds a maximum power capability of a transmitter; and

enabling a ACK power loop if the DRC backoff value is below a minimum threshold, wherein an ACK backoff value is reduced to incrementally reduce an ACK to pilot channel power ratio if the total power of traffic channels exceeds the maximum power capability of the transmitter.

2. Apparatus for reducing power ratios of a data rate control (DRC) channel and an acknowledgment (ACK) channel, comprising:

means for enabling a DRC power loop, wherein a DRC backoff value is reduced to incrementally reduce a DRC to pilot channel power ratio if a total power of traffic channels exceeds a maximum power capability of a transmitter; and

means for enabling a ACK power loop if the DRC backoff value is below a minimum threshold, wherein an ACK backoff value is reduced to incrementally reduce an ACK to pilot channel power ratio if the total power of traffic channels exceeds the maximum power capability of the transmitter.

3. A method for reducing power ratios of a data rate control (DRC) channel and an acknowledgment (ACK) channel, comprising:

computing a total power to pilot channel power ratio R;

comparing the ratio R to a maximum allowable total power to pilot channel power ratio R_M;

if R≦

R_M, then;

setting a DRC backoff value and an ACK backoff value to 1; and

refraining from reducing a DRC power ratio and an ACK power ratio;

if R>

R_M, then;

computing a new DRC backoff value;

determining whether the new DRC backoff value is positive or negative;

if the new DRC backoff value is positive, then;

setting a new ACK backoff value to 1;

using the new DRC backoff value and the new ACK backoff value to reduce the DRC power ratio;

if the new DRC backoff value is negative, then;

gating off the DRC channel;

computing a new ACK backoff value; and

using the new ACK backoff value to reduce the ACK power ratio.

4. Apparatus for adjusting power ratios of a data rate control (DRC) channel and an acknowledgment (ACK) channel, comprising:

a power and gain computation block means for computing a total power to pilot channel power ratio R;

a limiter means for comparing the ratio R to a maximum allowable total power to pilot channel power ratio R_M; and

a power throttle block means for implementing a power control algorithm, wherein the algorithm is for determining;

if R≦

R_M, then;

setting a DRC backoff value and an ACK backoff value to 1; and

refraining from reducing a DRC power ratio and an ACK power ratio;

if R>

R_M, then;

computing a new DRC backoff value;

determining whether the new DRC backoff value is positive or negative;

if the new DRC backoff value is positive, then;

setting a new ACK backoff value to 1;

using the new DRC backoff value and the new ACK backoff value to control a reduction in the DRC power ratio;

if the new DRC backoff value is negative, then;

gating off the DRC channel;

computing a new ACK backoff value; and

using the new ACK backoff value to control a reduction in the ACK power ratio.