Patent ID: 8189505
Filing Date: 2012-05-29
Classification: B60L,H04W,Y02T

Abstract:
1. A transmission power control method for controlling a transmission power of an uplink user data channel at a mobile station, comprising: determining a transmission period of an outer loop transmission power control signal and notifying the determined transmission period to the mobile station; transmitting, at the mobile station, the outer loop transmission power control signal in the determined transmission period through the uplink user data channel, even when uplink user data to be transmitted through the uplink user data channel does not exist; measuring, at a radio base station, a reception quality of the outer loop transmission power control signal received through the uplink user data channel; controlling, at the radio base station, the transmission power of the uplink user data channel based on the measurement result and a target reception quality; notifying, at the radio base station, the measurement result to a radio network controller; determining, at the radio network controller, a transmission power offset of the uplink user data channel based on the measurement result, and notifying the determined transmission power offset to the mobile station; determining, at the radio network controller, the target reception quality based on the measurement result, and notifying the determined target reception quality to the radio base station; and controlling, at the mobile station, the transmission power of the uplink user data channel by using the transmission power offset, wherein the uplink user data channel does not primarily transmit control signals; and wherein the transmission period is determined in accordance with a status of the mobile station or a congestion degree of a radio network.