Method for controlling the transmission power in wireless packet data transfers in both terminal devices and base stations of a cellular radio system.

摘要

Method for controlling the transmission power in wireless data transfer packet in both terminal devices and base stations of a cellular radio system. The control has control characteristics by closed and open loop. Before establishing the connection and during long pauses between packets, the terminal device measures the control signal (30, 31) transmitted by the base station and compares its power (R0) with the target level (t0) included in the signal Control parameter. The base station also informs about the transmission power, and the terminal device adjusts (32) its transmission power to the same, corrected for the difference between the target level and link measure (t0-R0) quality. Furthermore, link quality measurement (RXQUAL) is transmitted in packet acknowledgment messages and the transmitting device changes its transmission power to control the quality to a certain target level. The biggest step change is determined by the packet length. For the downlink, the base station uses first the maximum power and corrects its power by the measurement information included in acknowledgment messages transmitted by the terminal device. (Figure 3)