초록 ▼

In packet switched data transfer of the cellular radio system, the control of the transmission power comprises characteristics as well of the closed-loop control and the open-loop control. Before forming the connection and during long pauses between the packets, the terminal device measures the cont

In packet switched data transfer of the cellular radio system, the control of the transmission power comprises characteristics as well of the closed-loop control and the open-loop control. Before forming the connection and during long pauses between the packets, the terminal device measures the control signal transmitted by the base station and compares its signal power (R0) to the target level (t0), that is included by the base station in the control signal as a parameter. The base station informs in the control signal also the transmission power, whereby the terminal device sets the same power to be its transmission power, corrected by the difference between the target level and the measured quality of the link (t0-R0). In addition, also the measured quality of the link (RXQUAL) is transmitted in the acknowledgment messages of the packets, whereby the transmitting device changes its transmission power so that the quality will be controlled to the certain target level. The biggest step of the change is determined by the length of the packets. In the packet transfer downlink, the base station uses first the maximum power and corrects then its transmission power based on the measuring information included in the acknowledgment messages transmitted by the terminal device.

대표청구항 ▼

[ We claim:] [1.] A method for controlling transmission power in a terminal device of a cellular radio system, a radio connection of which with a certain base station comprises an alternative first state (10) and second state (11), in the first state of which the terminal device receives (30) signal

[ We claim:] [1.] A method for controlling transmission power in a terminal device of a cellular radio system, a radio connection of which with a certain base station comprises an alternative first state (10) and second state (11), in the first state of which the terminal device receives (30) signals transmitted regularly by the base station and in the second state of which the terminal device additionally g transmits (34) data as packets to the base station, characterized in that in said first state the control of the default value of the transmission power in said terminal device is based on measuring (31, 32) of the signals transmitted regularly by the base station, and in said second state the control of the transmission power in said terminal device is based both on a feedback transmitted by the base station on the quality of a data transfer link (35, 36, 37, 39) and on measuring of other signals transmitted regularly by the base station.