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Combined open loop/closed loop (CQI-based) uplink transmit power control with interference mitigation for E-UTRA

A technology of transmit power control and transmit power, which is used in transmission control/equalization, power management, electrical components, etc., and can solve problems such as path loss measurement error transmit power, performance reduction, setting error, etc.

Active Publication Date: 2009-11-25
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, open-loop TPC often leads to path loss measurement errors as well as transmit power setting errors
On the other hand, since slow closed-loop or CQI-based TPC is based on feedback signaled from the eNodeB, it is less sensitive to errors in measurements and transmit power settings
However, slow closed-loop or CQI-based TPC will degrade performance when no feedback is available because UL transmissions are paused or feedback transmissions are paused, or when the channel varies drastically

Method used

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  • Combined open loop/closed loop (CQI-based) uplink transmit power control with interference mitigation for E-UTRA
  • Combined open loop/closed loop (CQI-based) uplink transmit power control with interference mitigation for E-UTRA

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Embodiment

[0063] CLAIMS 1. A method for performing transmit power control (TPC) of a wireless transmit / receive unit (WTRU), the method comprising:

[0064] (a) the WTRU performs an open-loop intra-cell TPC procedure by determining setpoint parameters; and

[0065] (b) The WTRU performs a closed-loop intra-cell TPC procedure by using a closed-loop correction factor to adjust the setpoint parameters determined by the open-loop intra-cell TPC procedure.

[0066] 2. The method of embodiment 1, wherein the setpoint parameter is an uplink (UL) path loss from the WTRU to a serving evolved Node B (eNodeB) located in a serving cell, and The closed-loop correction factor is used to compensate for open-loop TPC-related errors related to setpoint parameters.

[0067] 3. The method as in any one of embodiments 1 and 2, wherein the closed loop correction factor is a function of uplink (UL) channel quality information (CQI) and a target signal to interference and noise ratio (SINR).

[0068] 4. The ...

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Abstract

A combined open loop and closed loop (channel quality indicator (CQI)-based) transmit power control (TPC) scheme with interference mitigation for a long term evolution (LTE) wireless transmit / receive unit (WTRU) is disclosed. The transmit power of the WTRU is derived based on a target signal-to-interference noise ratio (SINR) and a pathloss value. The pathloss value pertains to the downlink signal from a serving evolved Node-B (eNodeB) and includes shadowing. An interference and noise value of the serving eNodeB is included in the transmit power derivation, along with an offset constant value to adjust for downlink (DL) reference signal power and actual transmit power. A weighting factor is also used based on the availability of CQI feedback.

Description

technical field [0001] The present invention relates to wireless communication systems. Background technique [0002] For the Evolved Universal Terrestrial Radio Access (E-UTRA) uplink (UL), several transmissions have been submitted to the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Working Group 1 (WG1) Power Control (TPC) proposal. These proposals can generally be divided into (slow) open-loop TPC and slow closed-loop or channel quality information (CQI) based TPC. [0003] Open-loop TPC is based on path loss measurements performed at a wireless transmit / receive unit (WTRU) and system parameters provided by an evolved Node B (eNodeB). [0004] Closed-loop TPC is usually based on TPC feedback information (such as TPC commands) sent periodically from the eNodeB, where the feedback information is usually derived using the signal-to-interference-noise ratio (SINR) measured at the eNodeB of. [0005] For example, open-loop TPC can compensate for long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04W52/14
CPCH04W52/08H04W52/10H04W52/146H04W52/241H04W52/242H04W52/243H04W52/246H04W52/265H04W52/286
Inventor 辛颂尧D·M·格列可R·L·奥勒森
Owner INTERDIGITAL TECH CORP
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