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Outer loop power control method and apparatus thereof

An outer-loop power control and bit technology, applied in the direction of transmission control/equalization, can solve the problems of large storage, computational overhead, large variance of BER estimation, and difficulty in guaranteeing the wireless channel mapping relationship, etc. small effect

Active Publication Date: 2007-06-06
XFUSION DIGITAL TECH CO LTD
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Problems solved by technology

However, relevant literature points out that under Additive White Gaussian Noise (AWGN) and fading channels, the moment ratio (such as the second-order moment and the fourth-order moment) has a different functional relationship with the symbol SNR, so it is difficult to guarantee different Consistent mapping relationship under the wireless channel
The actual simulation also shows that even in the case of a long estimation period, the BER estimation variance based on this method is also large
[0010] In addition, from the perspective of implementation, this method needs to calculate the moment (such as the 4th order moment). If the central moment is used, the TPC in the outer loop power control cycle must be stored Symbols, storage and calculation overhead are relatively large

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  • Outer loop power control method and apparatus thereof
  • Outer loop power control method and apparatus thereof
  • Outer loop power control method and apparatus thereof

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Embodiment Construction

[0029] The idea of ​​the present invention is to use a new statistic to replace the TPC symbol BER for outer loop power control, and to indirectly realize the outer loop power control based on the TPC symbol BER by finding out the mapping relationship between the TPC symbol BER and the statistic.

[0030] The above-mentioned new statistic that can be competent must meet the following two points: first, there is a good mapping relationship between the TPC symbol BER and the statistic, specifically referring to a relatively consistent mapping relationship under different wireless channels; The outer loop power control whose statistic is the target Quality of Service (QOS) must converge, and the convergence characteristic is better.

[0031] For the convenience of explanation, first introduce the definition of TPC symbol BER and bit BER in F-DPCH channel reception. Let the demodulated TPC symbol be r, and the real part and imaginary part be r respectively I and r Q , the TPC co...

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Abstract

An external-loop power controlling method includes preparing a table by obtaining a mapping relation between coding error rate of TPC symbol and bit coding error rate, finalizing conversion of top-layer configured TPC object symbol BER to bit BER by checking table then estimating bit BER in real time in period of external-loop power control and carrying out external-loop power control based on said bit BER.

Description

【Technical field】 [0001] The present invention relates to an outer loop power control method and a device thereof in wireless communication, in particular to a Fractional Dedicated Physical Channel (F-DPCH) outer loop power control method and a device thereof. 【Background technique】 [0002] In a Wide-band Code Division Multiple Access (WCDMA) system, power is one of the important radio resources, and power management is a very important link in radio resource management. [0003] Power control can overcome the near-far effect and angle effect, compensate for fading, and improve system capacity by limiting and optimizing the transmit power of base stations and mobile stations. Therefore, power control technology is one of the most important key technologies in WCDMA systems. [0004] According to the purpose of power control, power control can be divided into open-loop and closed-loop power control, and closed-loop power control is further divided into inner-loop power contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005
Inventor 秦龙肖日韦
Owner XFUSION DIGITAL TECH CO LTD
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