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Method and apparatus for the outer loop of the power control system of a mobile communication system

A mobile communication system and power control technology, applied in transmission control/balance, power management, wireless communication, etc., can solve problems such as delay performance, and achieve the effect of optimizing system capacity

Inactive Publication Date: 2005-11-02
TOT POWER CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the strategy implies a capacity gain of the order of 30%, the procedure used to obtain said quality function introduces a delay which, as mentioned earlier, delays the performance of this type of module

Method used

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  • Method and apparatus for the outer loop of the power control system of a mobile communication system
  • Method and apparatus for the outer loop of the power control system of a mobile communication system
  • Method and apparatus for the outer loop of the power control system of a mobile communication system

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Embodiment Construction

[0030] Since the present invention is based on a stochastic approach, which attempts to describe the variation of radio signals in a specific environment, and is intended to be applied to real-time systems, these models must be as accurate as possible, even though they require enormous arithmetical complexity.

[0031] The statistics considered for wanted and interfering signals in several radio environments are given below in a logical manner.

[0032] Useful signal statistics:

[0033] The invention can be applied to macrocellular or microcellular channels in rural, suburban and urban environments.

[0034] In an urban microcellular environment, the statistical variation of the wanted signal strength is described in different ways depending on whether there is a direct beam between the transmitter and the receiver. Thus, there is LOS (Line of Sight: Line of Sight) communication in the first case, and NLOS (Non Line of Sight: Non Line of Sight) communication in the second ca...

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Abstract

Method and apparatus for the power control system outer loop of a mobile communications systems in a cellular infrastructure that allows fulfilling a given Quality of Service (QoS) with the minimum power level necessary. This outer loop is in charge of setting the desired signal to interference target ratio SIRtgt;that fulfils the required quality of service in a radioelectric environment characterised by stochastic models. The proposed method is based on the application of the Newton-Raphson iteration method on numerical approximations of the various outage probability (QoS) probability density functions in various propagation environments, so that having established this probability and dynamically estimated the second order moments characteristic of each statistic considered, the margin over the SIR median is obtained and thereby the SIRtgt corresponding to the aforementioned outage probability.

Description

technical field [0001] The present invention relates to the field of wireless communication systems, and more particularly to the outer loop of a power control system for a cellular telephone network. Background technique [0002] In January 1998, the European Telecommunications Standards Institute (ETSI) selected the basic technology for the Universal Mobile Telecommunications System (UMTS) (see ETSI, "The ETSI UMTS Terrestrial Radio Access (UTRA) ITU-R RTT Candidate Submission", June 1998) . The main radio interface proposed is WCDMA (Wideband Code Division Multiple Access), whose features are fully compatible with third generation (3G) mobile telephony requirements. Due to the higher data rates and more stringent Quality of Service (QoS) requirements in 3G, new planning strategies had to be developed. Probably the most studied of these is the power control system, and more specifically the method used to implement the outer loop of the system. [0003] Such a power con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/005H04J13/00
CPCH04W52/12H04W52/225H04W52/24Y02D30/70
Inventor 艾尔瓦罗·洛佩兹米德兰诺
Owner TOT POWER CONTROL