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Combined open loop/closed loop method for controlling uplink power of a mobile station

A link and transmission power technology, applied in transmission control/equalization, power management, electrical components, etc., can solve problems such as performance degradation, insensitivity to measurement and transmission power errors, etc.

Active Publication Date: 2010-01-13
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Open-loop PC can compensate for long-term channel variations, (such as path loss and shadow fading), for example, in an efficient manner that does not require recording of transmit power, but it is typically subject to errors in path loss measurements and transmit power settings
On the other hand, slow closed-loop or CQI-based PC is less sensitive to errors in measurements and transmit power settings, since it is based on feedback signals sent by the eNodeB
However, its performance degrades when no feedback is available due to interrupted UL transmission, or interrupted feedback transmission

Method used

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  • Combined open loop/closed loop method for controlling uplink power of a mobile station
  • Combined open loop/closed loop method for controlling uplink power of a mobile station
  • Combined open loop/closed loop method for controlling uplink power of a mobile station

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Embodiment

[0162] CLAIMS 1. A method for controlling transmit power of a Wireless Transmit Receive Unit (WTRU), the method comprising:

[0163] determining an open-loop uplink (UL) power control (PC) component based on path loss measurements;

[0164] determining closed loop power control components including correction factors; and

[0165] The open-loop and closed-loop components are combined with the power bias to determine the transmitted power.

[0166] 2. According to the method described in embodiment 1, the method also includes:

[0167] PC correction commands, correction factors based on the correction commands, or accumulated correction commands are received.

[0168] 3. The method of embodiment 2, wherein the PC correction command is received within a preconfigured signaling time.

[0169] 4. The method of embodiment 3, wherein the preconfigured signaling time is in a specific UL grant.

[0170] 5. The method of embodiment 4, wherein the UL grant is a Hybrid Access Repeat ...

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Abstract

A method and apparatus are disclosed comprising a combined open loop / closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).

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), there are a number of transmit power control (TPC) proposals delivered to the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Working Group 1 (WG1 ). These proposals are generally 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 typically based on TPC feedback information, such as TPC commands, sent periodically from the eNodeB, where the feedback information is typically derived using the Signal-to-Interference-Noise Ratio (SINR) measured at the eNodeB. [0005] Open-loop TPC can compensate for long-term channel v...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04W52/08H04W52/10H04W52/14H04W52/24
Inventor S·H·辛Z·林D·M·格列可R·L·奥勒森
Owner INTERDIGITAL TECH CORP
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