Method and apparatuses for power control using variable step size

摘要

The invention relates to a method in a radio communications network for controlling a transmission power of a user equipment (12) transmitting data to a radio base station (10) in the radio communications network. The radio base station (10) retrieves a target signal to interference ratio value and measures a signal to interference ratio of a signal transmitted with a current transmission power from the user equipment (12). The radio base station (10) then determines a user equipment capability of power control of the user equipment (12). Furthermore, the radio base station (10) computes a power control command based on the measured signal to interference ratio, the retrieved target signal to interference ratio, and the user equipment capability of power control, which power control command indicates a power control adjustment step of the user equipment (12). The radio base station (10) then transmits the power control command to the user equipment (12). The user equipment (12) calculates a transmission power step based on said received power control command and adjusts the transmission power by applying the calculated transmission power step to the current transmission power.

主权项

1. A method in a radio communications network for controlling a transmission power of a user equipment transmitting data to a radio base station in the radio communications network, the method comprising:
retrieving a target signal-to-interference ratio value in the radio base station; measuring, in the radio base station, a signal-to-interference ratio value of a signal transmitted with a current transmission power from the user equipment; determining whether the user equipment comprises a zooming quantization function; computing a power control command based on the measured signal-to-interference ratio value, the retrieved target signal-to-interference ratio value, and whether the user equipment comprises a zooming quantization function, by applying a model predictive control strategy based on a rolling horizon approach, wherein the power control command indicates a power control adjustment step of the user equipment; transmitting the power control command to the user equipment; calculating a transmission power step in the user equipment based on said received power control command; and adjusting the transmission power of the user equipment by applying the calculated transmission power step to the current transmission power.