Power control method for mobile communication system

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...

AI Technical Summary

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 signaling load of the system, so in the actual system, its single-use availability is not high

[0007] The basis of effective and accurate open-loop power control is that the uplink and downlink have consistent channel fading characteristics, and in the frequency division duplex (FDD) mobile communication system, since the uplink and downlink channels work in different channels In general, precise open-loop power control cannot be achieved, so open-loop power control can only play a role in rough control. Power control in the communication process is mainly realized through fast inner-loop power control, but the power control cycle and step Long power control algorithms are more complex

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