Power control method, system and apparatus in wineless communication system

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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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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