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An outside ring power control method and system

A technology of outer-loop power control and closed-loop power control, which is applied in the field of communication, and can solve problems such as inaccurate adjustments related to outer-loop power control, no consideration of transmission format combination indicators, and inaccurate SIR target values, etc.

Active Publication Date: 2008-04-30
LEADCORE TECH
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  • Application Information

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Problems solved by technology

[0006] However, the adjustment of the SIR target value based on the measurement and statistics of the BLER in the above-mentioned prior art is not very accurate, because the error of the Transport Format Combination Indicator (TFCI, TransportFormat Combination Indicator) is not considered in the algorithm, but in the wireless environment In severe cases, TFCI errors are relatively common
This makes the relevant adjustment of the outer loop power control inaccurate, thus affecting the performance of the system to a certain extent

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  • An outside ring power control method and system
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  • An outside ring power control method and system

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Embodiment Construction

[0063] The downlink outer loop power control method provided by the present invention is described as follows:

[0064] The UE adjusts the SIR of the downlink fast closed-loop power control according to the measured value of the received signal BLER and the comparison result of the TFCI error rate (hereinafter referred to as TER, TFCI Error Rate) and the set BLER target value and the TER target value target value.

[0065]Such as figure 1 As shown, when the outer loop period T arrives, the target signal-to-interference ratio adjustment process for the final coded composite transport channel (CCTrCH, Coded Composite Transport Channel) includes the following steps:

[0066] Step 101, according to the BLER of each transport channel statistics, obtain the SIR of each transport channel DCH of CCTrCH DCH-target[i] ; Take the maximum SIR of each transmission channel DCH-target[i] The value is used as the output SIR of the current outer loop cycle transmission channel DCH-target-c...

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Abstract

The invention provides a method and a system for controlling outer-loop power. The method includes the steps of adjusting the target value of SIR DCH-target-current according to the tested value of BLER (Block Error Rate) of a transmission channel, and adjusts the target value of SIR TFCI-target-current according to the tested value of TER (True Error Rate) of a transmission format combination indicator; comparing the target values of SIR DCH-target-current and SIR TFCI-target-current with that of SIR CCTrCH-target-last; and adjusting the target value of SIR CCTrCH-target-current according to the comparing result. Taking the statistic results of BLER and TER into the comprehensive consideration, the invention establishes the corresponding relationship with the SIR target value so as to make the target value of SIR controlled by the inner-loop power change with the change of network and wireless environment, thus lowering disturbance and increasing the system performance.

Description

technical field [0001] The present invention relates to the communication field, in particular to an outer loop power control method and system. Background technique [0002] Since the Code Division Multiple Access (CDMA, Code Division Multiple Access) system is an interference-limited self-interference system and has near-far effect characteristics, power control technology must be used in the system. The specific implementation of power control determines the quality of the system performance to a certain extent. [0003] Closed-loop power control includes two parts: inner-loop power control and outer-loop power control. The inner loop power control adjusts the transmit power of the base station or user equipment (UE, User Equipment) by comparing a signal to interference ratio (SIR, Signal to Interference Ratio) measurement value with a SIR target value. The ultimate goal of closed-loop power control is to ensure the service quality requirements of the link, but the bit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005
Inventor 胡文成胡业勇
Owner LEADCORE TECH