Pilot based, reversed channel power control

• US 5,933,781 A
• Filed: 01/31/1997
• Issued: 08/03/1999
• Est. Priority Date: 01/31/1997
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Jou, Yu-Cheun, Odenwalder, Joseph P., Willenegger, Serge
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Kincaid, Lester G.
• Application Number:
  US08/792,531
• Time in Patent Office: 914 Days
• Field of Search: 455/69, 455/522, 455/437, 455/442, 455/226.2, 455/226.3, 455/13.4, 370/335, 370/342, 375/200
• US Class Current: 455/522
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

A signal is transmitted at a transmit power and includes a traffic channel transmitted at a traffic channel transmit power, and a pilot channel transmitting at a pilot channel transmit power. The receive energy of the pilot channel is measured, and a decrease power control command is generating when the receive energy is greater than a receive energy threshold. If the receive energy is less than the receive energy threshold, an increase power control command is generated. The power control command is transmitted to the system generating the signal.

Claims

1. A method for performing transmit power control at a subscriber unit on a reverse link signal transmitted at a reverse link transmit power, wherein the reverse link signal has a traffic channel transmitted at a traffic channel transmit power, and a pilot channel transmitted at a pilot channel transmit power, comprising the steps of:

measuring at a base station a receive energy of the reverse link pilot channel;

generating a power control command in accordance with a comparison of said receive energy measurement with an energy threshold, wherein said power control command comprises an increase or decrease command;

receiving said power control command at said subscriber unit;

examining said power control command at said subscriber unit to determine whether the command is to be applied to either the reverse link traffic channel, the reverse link pilot channel, or the entire reverse link signal; and

selectively adjusting the transmit power of either the reverse link pilot channel, the reverse link traffic channel, or the entire reverse link signal in accordance with the examining step.

2. The method as set forth in claim 1 further comprising the step of transmitting said power control command via a forward link signal.

3. The method as set forth in claim 1, wherein the reverse link traffic channel is received at a set of power levels and a corresponding set of transmission rates.

4. The method as set forth in claim 1, wherein the step of measuring and the step of generating are continuously performed throughout transmission of said reverse link traffic channel.

5. The method as set forth in claim 1, wherein the step of selectively adjusting is also performed in response to a measurement of a forward link receive energy.

6. A system for performing transmit power control at a subscriber unit on a reverse link signal transmitted at a reverse link transmit power, wherein the reverse link signal has a traffic channel transmitted at a traffic channel transmit power, and a pilot channel transmitted at a pilot channel transmit power, comprising:

power control system that measures at a base station a receive energy of the reverse link pilot channel, for generating a power control command in accordance with a comparison of said receive energy measurement with an energy threshold, wherein said power control command comprises an increase or decrease command;

receiver at said subscriber unit that receives said power control command;

examination system that examines at said subscriber unit said power control command to determine whether the command is to be applied to either the reverse link traffic channel, the reverse link pilot channel, or the entire reverse link signal; and

a power controller that selectively adjusts the transmit power of either the reverse link pilot channel, the reverse link traffic channel, or the entire reverse link signal in accordance with said examination by said examination system.

7. The system as set forth in claim 6, wherein said receiver receives said power control command via a forward link signal.

8. The system as set forth in claim 6, wherein said base station receives the reverse link traffic channel at a set of power levels and a corresponding set of transmission rates.

9. The system as set forth in claim 6, wherein said power control system continuously measures said receive energy of the reverse link pilot channel throughout transmission of said reverse link traffic channel, and continuously generates said power control command throughout transmission of said reverse link traffic channel.

10. The system as set forth in claim 6, wherein said power controller selectively adjusts the transmit power of either the reverse link pilot channel, the reverse link traffic channel, or the entire reverse link signal further in response to a measurement of a forward link receive energy.