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Method and apparatus for link adaptation in a mobile communication system

A mobile communication system and channel technology, applied in the field of link adaptation devices, can solve the problems of increasing inter-channel interference, power waste at the transmitter end, and bandwidth waste, etc.

Inactive Publication Date: 2006-08-16
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This difference causes unnecessary power waste at the transmitter end, increases inter-channel interference in a wireless environment and results in wasted bandwidth

Method used

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  • Method and apparatus for link adaptation in a mobile communication system
  • Method and apparatus for link adaptation in a mobile communication system
  • Method and apparatus for link adaptation in a mobile communication system

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Embodiment Construction

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0034] In the following description, the term "forward link" is defined as the wireless link formed in the direction from the access network AN to the access terminal AT, and the term "reverse link" is defined as the wireless link formed in the direction from the access terminal AT to the access terminal AT The wireless link formed in the direction of the incoming network AN. In addition, the term "DRC (Data Rate Control)" is defined as information on the data rate requested by the receiver.

[0035] image 3 The process of determining the forward data rate and transmit power level based on DRC and C / I tolerance according to the first embodiment of the present invention is illustrated. see...

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Abstract

Disclosed is a method for determining a forward data rate and a forward transmission power level in a mobile communication system. An access terminal measures a C / I of a forward pilot channel, determines a forward data rate by matching the measured C / I with a reference C / I, creates a difference between the measured C / I and the reference C / I as margin information, and transmits the determined forward data rate and margin information over a reverse transmission channel. Upon receipt of the forward data rate and margin information, an access network decreases a transmission power level by power corresponding to the margin information and performs forward transmission at the forward data rate at the decreased transmission power level.

Description

technical field [0001] The present invention generally relates to mobile communication systems, and more particularly, to a link adaptation apparatus and method in a CDMA (Code Division Multiple Access) mobile communication system. Background technique [0002] In a mobile communication system utilizing a wireless channel, attenuation of a wireless signal differs according to distance and shadowing between an access network (AN) and an access terminal (AT). Furthermore, wireless channels used in mobile communication systems suffer from considerable interference between signals and fading. Therefore, the carrier-to-interference ratio (hereinafter abbreviated as C / I) greatly varies according to the conditions of the wireless channel. Link adaptation techniques have been proposed to improve channel throughput by adjusting the data rate according to channel conditions (or C / I). The data rate is determined according to the coding rate and modulation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B7/005H04J13/00H04W28/00H04W52/04H04W52/24H04W52/26
CPCH04W52/241Y02B60/50H04W52/24H04W52/247H04W52/267H04B7/26H04W28/22H04W52/14
Inventor 许埙尹裕皙尹淳暎廉再兴梁相贤姜熙原
Owner SAMSUNG ELECTRONICS CO LTD