Descending power control method in TD-CDMA system

Abstract

This invention relates to a method for controlling down closed loop power in the TD-SCDMS system including: when a base station tests that the quality of the up link is at a worsen state, it turns itself to a down link resuming period to up-adjust the power control order with the resumed step length response power and down-adjust the power control order with conventional step length response power, in this way, the base station controls power of each down coding combined transmitting channel based on the down closed loop power control mode to strengthen the effect of down closed loop power control when quality of the up and down links drops at the same time.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a downlink power control method in a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system. Background technique [0002] The closed-loop power control technology is a key technology in the TD-SCDMA system. The user equipment / base station periodically adjusts the transmission power according to the power control command carried by the feedback link from the base station / user equipment. [0003] Take the downlink closed-loop power control as an example. After receiving the downlink signal from the base station, the user equipment decides whether to increase or decrease the transmit power of the base station according to specific criteria, and generates a corresponding power control command. The power control command generated by the user equipment It is transmitted to the base station through the uplink feedback channel, and the base station adju...

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Problems solved by technology

[0004] For the TD-SCDMA closed-loop power control system, the necessary condition for the downlink closed-loop power control to work well is that the uplink power control command word feedback channel needs to maintain a certain communication quality. If the communication quality of the uplink power control command word feedback channel declines, The downlink closed-loop power control will be affected. When the communication quality of the uplink power control command word feedback channel deteriorates to a certain extent, the downlink closed-loop power control will fail

[0005] Similarly, the necessary condition for the uplink closed-loop power control to work well is that the downlink power control command word feedback channel needs to maintain a certain communication quality. If the communication quality of the downlink power control command word feedback channel decreases, the uplink closed-loop power control will be affected. If the communication quality of the downlink power control command word feedback channel deteriorates to a certain extent, the uplink

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