Subchannel control loop

• US 7,843,863 B2
• Filed: 03/12/2001
• Issued: 11/30/2010
• Est. Priority Date: 02/13/1997
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jou, Yu-Cheun, Willenegger, Serge
• Primary Examiner(s): Wilson; Robert W
• Application Number:
  US09/804,621
• Publication Number:
  US 20010010684A1
• Time in Patent Office: 3,550 Days
• Field of Search: 370/311, 370/205, 375/1, 375/205
• US Class Current: 370/311
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

Independently controlling the transmitted power of each subchannel by a subchannel control loop is described. A transmitting station generates a channel made up of a sum of subchannels wherein each subchannel or group of subchannels is amplified with a unique gain value that is varied in accordance with subchannel power control messages from the receiving station. The receiving station generates each subchannel power control message subsequent to monitoring and calculating metrics based on that received subchannel.

Claims

1. A method for wireless communications comprising:

receiving, by an apparatus, from a single remote station a reverse link signal that comprises a plurality of subchannel signals, wherein the plurality of subchannel signals are transmitted by the single remote station;

comparing a frame error rate of each of said subchannel signals with a frame error rate threshold; and

generating power control messages, based on the comparison, to be used by the single remote station to independently adjust transmit powers of more than one of said plurality of subchannel signals to different levels.

2. The method as recited in claim 1 further comprising:

generating a plurality of quality threshold values, corresponding to said plurality of subchannels, in accordance with a measured frame error rate for each of said subchannel signals.

3. The method as recited in claim 1 wherein said generating includes generating at least a plurality of bits, wherein each bit represents a command to increase or decrease the transmit power of one of said subchannel signals by a predetermined amount.

4. The method as recited in claim 1 further comprising:

generating a plurality of gain values; and

applying each gain value to one of said plurality of subchannel signals for adjusting the transmit powers of said subchannel signals.

5. The method as recited in claim 1 further comprising:

decoding each of said corresponding subchannel signals and determining frame errors in said subchannel signals.

6. An apparatus for wireless communication comprising:

a receiver configured to receive from a single remote station a reverse link signal that comprises a plurality of subchannel signals, wherein the plurality of subchannel signals are transmitted by the single remote station;

a threshold generator configured to provide a frame error rate threshold for at least one of the subchannel signals;

a comparator configured to compare a frame error rate of at least one of the subchannel signals with the threshold for that subchannel signal; and

a message generator configured to generate power control messages, based on the comparison, to be used by the single remote station to independently adjust transmit powers of more than one of the plurality of subchannel signals to different levels.

7. The apparatus for wireless communication of claim 6 wherein the message generator is configured to generate a plurality of quality threshold values, corresponding to the plurality of subchannels, in accordance with a measured frame error rate for each of the subchannel signals.

8. The apparatus for wireless communication of claim 6 wherein the message generator is configured to generate at least a plurality of bits, wherein each bit represents a command to increase or decrease the transmit power of one of the subchannel signals by a predetermined amount.

9. The apparatus for wireless communication of claim 6 further comprising:

a decoder configured to decode each of the subchannel signals from the received reverse link signal; and

wherein the comparator is configured to calculate the frame error rate in each of the subchannel signals.

10. An apparatus for wireless communication comprising:

means for receiving from a single remote station a reverse link signal that comprises a plurality of subchannel signals, wherein the plurality of subchannel signals are transmitted by the single remote station;

means for providing a frame error rate threshold for at least one of the subchannel signals;

means for comparing a frame error rate of at least one of the subchannel signals with the threshold for that subchannel signal; and

means for generating power control messages, based on the comparison, to be used by the single remote station to independently adjust transmit powers of more than one of the plurality of subchannel signals to different levels.

11. The apparatus for wireless communication of claim 10 further comprising means for generating a plurality of quality threshold values, corresponding to the plurality of subchannels, in accordance with a measured frame error rate for each of the subchannel signals.

12. The apparatus for wireless communication of claim 10 further comprising means for generating at least a plurality of bits, wherein each bit represents a command to increase or decrease the transmit power of one of the subchannel signals by a predetermined amount.

13. The apparatus for wireless communication of claim 10 further comprising means for decoding each of the subchannel signals from the received reverse link signal;

and means for calculating the frame error rate in each of the subchannel signals.

14. A base station comprising:

an antenna;

a receiver configured to receive from a single remote station, via the antenna, a reverse link signal that comprises a plurality of subchannel signals, wherein the plurality of subchannel signals are transmitted by the single remote station;

a threshold generator configured to provide a frame error rate threshold for at least one of the subchannel signals;

a comparator configured to compare a frame error rate of at least one of the subchannel signals with the threshold for that subchannel signal; and

a message generator configured to generate power control messages, based on the comparison, to be use by the single remote station to independently adjust transmit powers of more than one of the plurality of subchannel signals to different levels.