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Method and system for adjusting downlink outer loop power to control target SIR

A technology of target signal and transmission power, which is applied in the field of compensating for changing channel conditions and adjusting the step size of the signal-to-interference ratio, and can solve problems such as taking a long time

Inactive Publication Date: 2009-08-26
INTERDIGITAL TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because outer-loop power control relies on periodic redundancy checks, it often takes longer to converge to the desired target SIR for low block error rates

Method used

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  • Method and system for adjusting downlink outer loop power to control target SIR
  • Method and system for adjusting downlink outer loop power to control target SIR
  • Method and system for adjusting downlink outer loop power to control target SIR

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Embodiment Construction

[0016] The preferred embodiments are now described below with reference to the drawings, wherein like reference numerals represent like components.

[0017] Although the preferred embodiment illustrates a 3rd Generation Cooperative Project Wideband Code Division Multiple Access (W-CDMA) system using TDD mode, it should be noted that the invention in its broadest form is also applicable to other transmission systems without limitation. For example, embodiments can be applied to Frequency Division Duplex (FDD), Time Division Synchronous Code Division Multiple Access (TDSCDMA), Code Division Multiple Access 2000, IEEE Standard 802.11.

[0018] Hereinafter, a WTRU may include, but is not limited to, user equipment, a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of component operable in a wireless environment. Hereinafter, what is referred to as a base station may include, but is not limited to, a base station, Node-B, address controller, access poi...

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PUM

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Abstract

A wireless communication system and method capable of controlling transmission power to maintain a received signal-to-interference ratio (SIR) as close as possible to a target SIR. The received quality is maintained as close as possible to the target quality based on the block error rate. When the target block error rate is converted to the initial target SIR, since the target SIR required for the target block error rate varies with channel conditions, errors may occur due to channel condition mismatch. The outer loop power control process is used to set the target SIR for each code combination transport channel (CCTrCH) based on the desired target block error rate. The process may adjust the SIR step size to maximize the process convergence speed.

Description

technical field [0001] The present invention relates to the field of wireless communication. More particularly, the present invention relates to compensating for changing channel conditions and adjusting the signal-to-interference ratio (SIR) step size. Background technique [0002] Spread spectrum time division duplex (TDD) systems can carry multiple communications on the same spectrum. Multiple signals are distinguished by their individual chip code sequences (codes). In one configuration, a spread spectrum TDD system uses repeating frames divided into a number of time slots, eg 15 time slots. In this system, communications are transmitted in selected time slots out of the plurality of time slots, and a frame can carry multiple communications identified by time slots and codes. The combination of a single code in a single time slot is called an actual channel. Based on the bandwidth required to support the communication, one or more physical channels are assigned to su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/16H04B1/707H04B7/005H04B7/26H04J13/00H04W52/12H04W52/50
CPCH04W52/241H04W52/362H04W52/50H04W52/20H04W52/12H04W52/24
Inventor 章修·谷颂佑·辛查理斯·丹尼恩
Owner INTERDIGITAL TECH CORP
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