Power control method for mobile communication system

A mobile communication system, power control technology, applied in transmission control/equalization, power management, wireless communication, etc., can solve the problems of coarse control, inability to achieve open-loop power control, and large signal amplitude changes

Active Publication Date: 2007-06-20
XIAOMI INC
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Problems solved by technology

The main advantage of open-loop power control is that it reduces the processing delay of the power control process and reduces the complexity of the power control algorithm; the disadvantage is that the open-loop power control makes the signal amplitude change greatly, and at the same time, it must have more accurate channel estimation results. Ensure the effectiveness of open-loop power control. In addition, due to the time-varying nature of the mobile environment and channels, open-loop power control alone may not guarantee the accuracy of power control. If real-time and fast open-loop power control is used, it will be greatly reduced. Increase the measurement burden and signa

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  • Power control method for mobile communication system
  • Power control method for mobile communication system

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Embodiment Construction

[0027] The method of the present invention uses closed-loop power control information to trigger open-loop power control, and the system triggers the user terminal to perform corresponding open-loop power control processes in the following four situations according to the detection results.

[0028] When the system (mobile station or base station) detects that the closed-loop power control that has been issued (or has been executed) has been adjusted for N consecutive times (a preset number of parameter values), the corresponding open-loop power control process is triggered. ;

[0029]When the system (mobile station or base station) detects that the closed-loop power control that has been issued (or has been executed) has been issued (or has been executed) for M consecutive times (preset parameter values ​​for a certain number of times) to adjust the power reduction, it will trigger the corresponding open-loop power control process;

[0030] When the system (mobile station or...

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Abstract

The power controlling method is used in obtaining optimized power controlling effect in mobile communication system. The method is one closed-loop and opened-loop combining power control method with closed-loop power control information to trigger opened-loop power control. The method includes closed-loop power control and closed-loop power control information record; judgment of whether the same recorded closed-loop power control information exceeds the preset threshold value; and if so, triggering the opened-loop power control course before returning to closed-loop power control, or else, continuing closed-loop power control. The same closed-loop power control information includes continuous power increasing or decreasing times or increased or decreased power accumulating value. For TD-SCDMA system, the opened-loop power control measures the downward frequency guide time interval or P-CCPCH signal strength.

Description

technical field [0001] The present invention relates to a mobile communication technology, more specifically to a power control method in a mobile communication system. Background technique [0002] In Code Division Multiple Access (CDMA) mobile communication systems, power control is mainly used to overcome the near-far effect, reduce system interference and save power consumption. The power control technology is based on the evaluation of the received signal energy or signal-to-noise ratio index at the receiving end, and timely and moderately compensates the signal fading in the wireless channel, so as to maintain the communication quality of the user without affecting the communication quality of the same wireless channel. Unnecessary interference is generated by other users in the resource, and communication quality is maintained while ensuring system capacity. [0003] In the existing CDMA mobile communication system, power control can be mainly divided into outer loop...

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Application Information

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IPC IPC(8): H04Q7/20H04B7/26H04B7/005H04W52/08
CPCY02B60/50Y02D30/70
Inventor 周德锁杨华王安义赵敏赵瑾波肖登坤
Owner XIAOMI INC
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