Power control during a transmission pause

• US 7,509,138 B2
• Filed: 05/18/2004
• Issued: 03/24/2009
• Est. Priority Date: 11/12/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Zeira, Ariela, Ozluturk, Fatih, Grieco, Donald M.
• Primary Examiner(s): Vuong; Quochien B.
• Assistant Examiner(s): Chan; Richard
• Application Number:
  US10/848,185
• Publication Number:
  US 20040214593A1
• Time in Patent Office: 1,771 Days
• Field of Search: 455/522, 455/68, 455/69, 455/504, 455/500, 455/432.1, 455/436, 455/442, 455/438, 455/439
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/287 when the channel is in stand-by
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission

Abstract

A transmitting station performs closed loop power control prior to a transmission pause. A closed loop transmission power level prior to the pause is determined. A reference signal is received and a received power level of the reference signal prior to and during the transmission pause is determined. The measured reference signal received power levels are compared to a transmit power level of the reference signals to produce a pathloss estimate of the reference signal prior to and during the transmission pause. A new transmit power level is determined by adjusting the closed loop transmission power level by a change between the prior to and during pathloss estimates. A transmission power level of the transmitting station is set to the determined new transmit power level. A communication is transmitted at the set transmission power level.

Claims

1. A method for adjusting a transmission power level of a transmitter after commencement of a discontinuous transmission, the method comprising:

receiving a reference signal during discontinuous transmission;

determining a change in channel conditions during discontinuous transmission using the reference signal;

adjusting the transmission power level in response to the change in channel conditions.

2. The method of claim 1 wherein the change in channel conditions is determined by comparing an actual path loss before the discontinuous transmission and an estimated path loss during the discontinuous transmission calculated using the reference signal.

3. The method of claim 2 wherein the estimated path loss is weighted using a long term path loss estimate.

4. A transceiver configured to adjust a transmission power level after commencement of a discontinuous transmission, the transmitter comprising:

a receiver for receiving a reference signal during the discontinuous transmission;

a measurement unit for determining a change in channel conditions during the discontinuous transmission using the reference signal;

a power control unit for adjusting the transmission power level in response to the change in channel conditions.

5. The transceiver of claim 4 wherein the measurement unit determines the change in channel conditions by comparing an actual path loss before the discontinuous transmission and an estimated path loss during the discontinuous transmission calculated using the reference signal.

6. The transceiver of claim 5 wherein the measurement unit determines a weighted estimated path loss using a long term path loss estimate.