Adjustment of target signal-to-interference in outer loop power control for wireless communication systems.

A technique for power regulation, targeting, applied in power control. It can solve problems such as error, target SIR convergence delay, performance degradation of power control algorithm, etc.

Inactive Publication Date: 2007-07-04
INTERDIGITAL TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This channel condition mismatch may cause errors when the WTRU converts this target BLER to the original target SIR because the target SIR required for the target BLER changes with channel conditions
Thus, the iterative process of determining the target SIR has an initial variance that must be overcome by converging to the desired target value, and compounded by allowing CRC to take place, all resulting in a delay in the convergence of the target SIR
[0019] The entire power control algorithm may degrade due to this delay

Method used

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  • Adjustment of target signal-to-interference in outer loop power control for wireless communication systems.
  • Adjustment of target signal-to-interference in outer loop power control for wireless communication systems.
  • Adjustment of target signal-to-interference in outer loop power control for wireless communication systems.

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Embodiment Construction

[0031] The invention is described below with reference to the drawings, wherein like numerals refer to like elements. The terms base station, wireless transmit / receive unit (WTRU) and mobile unit are used in their generic sense. The term base station is used herein to include, but is not limited to, a base station, Node-B, site controller, access point, or other interface device in a wireless environment that provides a WTRU with wireless access to a network to which the base station is associated.

[0032] The term WTRU is used herein to include, but is not limited to, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment. WTRUs include personal communication devices such as phones, video phones, and Internet ready phones with network connections. Also, WTRUs include portable personal computing devices such as PDAs and notebook computers that include wireless modems with similar...

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Abstract

A method system and components for outer loop power control which compensates for changing channel conditions. A target metric, preferably target signal-to-interference ratio (SIR), is adjusted with differing step up and step down levels to converge on a relatively low steady state level of step up and step down target metric adjustments. The initial target SIR remains fixed during an inner loop settling state, followed by incremental target SIR adjustments during a transient state, and smaller incremental target SIR adjustments in a steady state. Step sizes of the adjustments are preferably based on the target block error rate (BLER) and the number of errors detected within predetermined time intervals.

Description

technical field [0001] The present invention generally relates to wireless communication systems. In particular, the invention relates to power control in such systems. Background technique [0002] Wireless communication systems are known in the art. In order to provide global connectivity for wireless systems, various standards have been developed and implemented. One standard currently in wide use is known as the Global System for Mobile Communications (GSM). This is considered the so-called second generation mobile radio system standard (2G) and its subsequent modification (2.5G). GPRS and EDGE are examples of 2.5G technologies that provide relatively high speed data services over (2G) GSM networks. These standards all attempt to improve upon previous standards to provide additional features and enhancements. In January 1998, the European Telecommunications Standards Institute - Special Mobility Division (ETSI SMG) agreed on a radio access scheme for the third gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/00H04B1/00
Inventor 谷章修查理斯·丹尼恩
Owner INTERDIGITAL TECH CORP
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