Uplink transmit power control

Patent metadata

Field	Value
Publication number	US-9467951-B2
Application number	US-201214406219-A
Country	US
Kind code	B2
Filing date	Jun 29, 2012
Priority date	Jun 29, 2012
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

The embodiments herein relate to a method in a base station for transmitting an UpLink Transmit Power Control, UL TPC, command to a user equipment in a communications network. The base station obtains a measurement of a distortion of a signal received from the user equipment. The signal is associated with a power to be controlled. The base station determines that the signal is unreliable if the distortion measurement is above a threshold or determining that the signal is reliable if the distortion measurement is below the threshold. The base station transmits a first UL TPC command to the user equipment when the signal is determined to be unreliable or transmits a second TPC command to the user equipment when the signal is determined to be reliable.

First claim

The invention claimed is:

1. A method in a base station for transmitting an UpLink Transmit Power Control (UL TPC) command to a user equipment in a communications network, the method comprising:
obtaining a measurement of a distortion of a signal received from the user equipment, wherein the signal is associated with a power to be controlled;
determining that the signal is unreliable if the distortion measurement is above a threshold or determining that the signal is reliable if the distortion measurement is below the threshold; and
transmitting a first UL TPC command to the user equipment when the signal is determined to be unreliable or transmitting a second TPC command to the user equipment when the signal is determined to be reliable,
wherein the obtaining the measurement of the distortion of the signal received from the user equipment further comprises:
measuring, before a Digital Automatic Gain Control (DAGC) compression, a power associated with the signal received from the user equipment, which power is to be controlled;
measuring, after the DAGC compression, the power associated with the signal; and
wherein the measurement of the distortion is based on the measurement of the power before the DAGC compression and the measurement of the power after the DAGC compression.

2. The method according to claim 1 , wherein the measuring after the DAGC compression is performed after a time interval after the measuring before the DAGC compression is performed.

3. The method according to claim 1 , wherein the first TPC command comprises a plurality of constant TPC commands, or wherein the first TPC command comprises a plurality of toggled TPC commands, or wherein the first TPC command comprises a predetermined number of TPC commands.

4. The method according to claim 1 , wherein the received signal is a compressed data signal and wherein the distortion measurement comprises compression loss information related to the compressed data signal.

5. The method according to claim 1 , wherein the communications network is based on Wideband Code Division Multiple Access (WCDMA) or based on Code Division Multiple Access (CDMA).

6. A base station configured to transmit an UpLink Transmit Power Control (UL TPC) command to a user equipment in a communications network, the base station comprising:
a processor configured to:
obtain a measurement of a distortion of a signal received from the user equipment, wherein the signal is associated with a power to be controlled; and to
determine that the signal is unreliable if the distortion measurement is above a threshold or to determine that the signal is reliable if the distortion measurement is below the threshold; and

a transmitter configured to transmit a first UL TPC command to the user equipment when the signal is determined to be unreliable or to transmit a second TPC command to the user equipment when the signal is determined to be reliable,
wherein the processor is further configured to:
measure, before a Digital Automatic Gain Control (DAGC) compression, a power associated with the signal received from the user equipment, which power is to be controlled; and to
measure, after the DAGC compression, the power associated with the signal; and
wherein the measurement of the distortion is based on the measurement of the power before the DAGC compression and the measurement of the power after the DAGC compression.

7. The base station according to claim 6 , wherein the processor is further configured to perform the measuring after the DAGC compression after a time interval after the measuring before the DAGC compression is performed.

8. The base station according to claim 6 , wherein the first TPC command comprises a plurality of constant TPC commands, or wherein the first TPC command comprises a plurality of toggled TPC commands, or wherein the first TPC command comprises a predetermined number of TPC commands.

9. The base station according to claim 6 , wherein the received signal is a compressed data signal and wherein the distortion measurement comprises compression loss information related to the compressed data signal.

10. The base station according to claim 6 , wherein the communications network is based on Wideband Code Division Multiple Access (WCDMA) or based on Code Division Multiple Access (CDMA).

Assignees

• Mjogeman Marc
• Lamm Anders
• Nilsson Magnus
• ERICSSON TELEFON AB L M (publ)

Inventors

• Mjogeman Marc
• Lamm Anders
• Nilsson Magnus

Classifications

• H04W52/241

  taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo · CPC title

• H04W52/245

  taking into account received signal strength · CPC title

• H04W52/146 Primary

  Uplink power control · CPC title

• H04W52/52

  using AGC [Automatic Gain Control] circuits or amplifiers · CPC title