Power control method, system and apparatus in wineless communication system

A wireless communication system and power control technology, applied in the field of network communication, can solve problems such as inconsistent uplink transmission loss, unstable power control of user terminals, and unknown Offset_SsperSS value, etc., to avoid unstable power control and improve system stability , Improve the effect of channel quality

Inactive Publication Date: 2007-01-10
HUAWEI TECH CO LTD
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Problems solved by technology

[0013] From the above description, it can be seen that no matter in the active open-loop power control mode or in the passive open-loop power control mode, the SS needs to use Offset_BSperSS as a parameter in calculating its uplink transmit power. However, in the active open-loop power control mode In this case, when the BS sends a power adjustment command to the SS, it does not know the value of L estimated by the SS and the value of Offset_SsperSS. In the passive open-loop power control mode, when the BS sends a power adjustment command to the SS, it does not know the value L value, therefore, the Offset_BSperSS issued by the BS to the SS may not match the estimated uplink transmission power adjustment and uplink transmission loss of the SS, which will cause unstable power control of the user terminal

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  • Power control method, system and apparatus in wineless communication system

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[0060] As the channel environment changes, the uplink transmission parameters of the mobile terminal will also change. For example, the uplink transmission loss L estimated by the SS will change, and the value of the uplink power offset Offset_SSperSS adjusted by the SS will also change. If the base station BS can Determine the power offset parameter Offset_BSperSS according to the specific conditions of the uplink channel of the mobile terminal, so that the power offset parameter issued by the base station can match the specific conditions of the uplink channel of the mobile terminal, so that the mobile terminal The offset parameters Offset_BSperSS and uplink transmission loss L are used to perform passive open-loop power control, or the mobile terminal performs power control according to the power offset parameter Offset_BSperSS issued by the base station and the uplink power offset Offset_SSperSS and uplink transmission loss L adjusted by the SS itself. During the active ope...

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Abstract

The invention discloses a method, system and equipment for controlling power. The core of the method is that based on information reported from mobile terminal, base station determines up going transmission parameter of mobile terminal; based on up going transmission parameter, base station determines power offset parameter needed to adjust for mobile terminal, and sends down the power offset parameter to the mobile terminal; based on up going transmission parameter measured and calculated, and power offset parameter sent from the base station, mobile terminal carries out power control in open loop. The invention can determines power offset parameter needed to adjust precisely so as to prevent unstable effect of mobile terminal in procedure of controlling power in open loop. Thus, the invention raises quality of channel and stability of system.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to a power control method, system and device in a wireless communication system. Background technique [0002] Power control is a key technology in wireless mobile communication systems, which plays an important role in overcoming shadow fading, fast fading, near-far effect, saving transmission power, and reducing interference. [0003] Uplink power control in power control is divided into open-loop power control and closed-loop power control, and open-loop power control can be further divided into active open-loop power control and passive open-loop power control. [0004] The implementation method of the open-loop power control in the wireless mobile communication system will be described below by taking the Wimax system as an example. [0005] First, the base station notifies the mobile terminal SS to enter the open-loop power control mode through the PMC_R...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005
Inventor 朱静宁
Owner HUAWEI TECH CO LTD
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