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Outer-loop power control method

A technology of outer loop power control and adjustment period, applied in power management, wireless communication, electrical components, etc., can solve the problems of untimely adjustment, slow convergence, slow convergence of SIRTarget, etc., to achieve timely adjustment and improve the effect of convergence speed

Inactive Publication Date: 2011-04-20
TD TECH COMM TECH LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

This outer loop power control method adopts a periodic and fixed-step adjustment method for the SIR Target. Interference area, etc.), if the outer loop power control adjustment period is in progress, timely SIR Target adjustment cannot be achieved, and the SIR Target after the open loop will converge slowly
[0006] For Wideband Code Division Multiple Access (WCDMA) systems, the inner loop power control frequency is very high, 1500 Hz, so the WCDMA outer loop power control period is very short, and the above-mentioned problem of untimely adjustment of the outer loop will not occur. However, for the TD-SCDMA system, the inner loop power control frequency is relatively low, only 200Hz, so the outer loop power control cycle cannot be too short, so there must be the above-mentioned problems of untimely adjustment of SIR Target and slow convergence speed

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Embodiment Construction

[0023] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] In the present invention, most basically, when the system transmission environment is poor and the SIR Target is low, the SIR Target up-adjustment cycle is shortened, and the SIR Target is raised rapidly, thereby ensuring the timeliness of adjustment and making the user's signal transmission performance reach the level of the system Require.

[0025] At the same time, since the down-regulation of the SIR Target may lead to a decrease in user signal transmission performance, and even cause problems such as call drop and disconnection, it is necessary to be more cautious about the down-regulation of the SIR Target. Based on this, the most basic adjustment method in the present invention , the lowering of the SIR Target is not changed, and the existing implement...

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Abstract

The present invention discloses an outer-loop power control method comprising presetting the duration of the adjustment period and the target block error ratio (BLER)of outer-loop power control; calculating, on the real-time basis, the number of accumulated absolute error blocks of transmission data blocks during the current outer-loop power control adjustment period, and directly up-regulating the target value of signal to interference ratio (SIR Target) and ending the current outer-loop power control adjustment period and starting the next outer-loop power control adjustment period if the number of accumulated absolute error blocks is greater than the preset direct up-regulation threshold; calculating the BLER mean value within the outer-loop power control adjustment period when any outer-loop power control adjustment period reaches to the duration and adjusting SIR Target based on the BLER mean value and preset target BLER. SIR Target can be adjusted in time and the convergence speed thereof can be improved through the method disclosed in the invention.

Description

technical field [0001] The invention relates to a power control method in a communication system, in particular to an outer loop power control method. Background technique [0002] In Time Division Multiplexing - Synchronous Code Division Multiple Access (TD-SCDMA) system, the open-loop power control is used to determine the user's initial transmit power, and the closed-loop power control is estimated by the measurement of the signal-to-interference ratio (SIR) and the SIR target Value (SIR Target), adjust the size of the transmit power, and complete the main process of power control. [0003] In different multipath environments, the SIR Target used for closed-loop power control changes, and it is necessary to adjust the SIR Target of the inner-loop power control according to the block error rate (BLER) of the received signal, so that the system can always use the minimum power To meet the requirements of communication quality. The process of adjusting the SIR Target accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/12H04W52/24H04W52/36
Inventor 王亮
Owner TD TECH COMM TECH LTD
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