User equipment for controlling transmission power levels

• US 20070030882A1
• Filed: 10/10/2006
• Published: 02/08/2007
• Est. Priority Date: 03/22/2000
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Dick, Stephen, Zeira, Ariela
• Application Number:
  US11/545,665
• Publication Number:
  US 20070030882A1
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A user equipment (UE) for controlling transmission power levels in a system employing a spread spectrum time division duplex (TDD) technique having frames with timeslots for communication comprises a measuring device configured to receive, during a first time slot, a communication including a power level and measure the power level of the received communication and an interference power level. A pathloss estimation device determines a pathloss estimate and a long term pathloss estimate, based in part on the measured power level and the received power level. A quality measurement device determines a first quality factor, α, and a second quality factor, 1−α, of the pathloss estimate based in part on a number of timeslots, D, between the first and a second timeslot. A transmit power calculation device sets a transmission power level for transmission during the second timeslot.

Claims

1. A user equipment (UE) for controlling transmission power levels in a system employing a spread spectrum time division duplex (TDD) technique having frames with timeslots for communication, the UE comprising:

a measuring device configured to receive, during a first time slot, a communication including a power level and measure the power level of the received communication and an interference power level;

a pathloss estimation device configured to determine a pathloss estimate and a long term pathloss estimate, based in part on the measured power level and the received power level;

a quality measurement device configured to determine a first quality factor, α

, and a second quality factor, 1−

α

, of the pathloss estimate based in part on a number of timeslots, D, between the first and a second timeslot; and

a transmit power calculation device configured to set a transmission power level for transmission during the second timeslot based in part by adding the pathloss estimate multiplied by the first quality factor, to long-term pathloss estimate multiplied by the second quality factor, to the measured interference power level, to a target signal to interference ratio, to a constant value.

2. The UE of claim 1 wherein a maximum time slot delay is D_max and the determined quality, α

, is determined by;

α

=1−

(D−

1)/(D_max−

1).

3. The UE of claim 1 wherein a maximum allowed time slot delay is D_max-allowed and the determined quality, α

, is determined by;

α

=max {1−

(D−

1)/(D_max-allowed−

1),0}.