| 摘要 |
<p>The present invention relates to a method and an enhanced uplink (UL) telecommunication system for power control. The system comprises at least one first radio network controller (RNC) (12) and at least one first base station (11), which enables wireless communication with at least one first user terminal (15). The power for an uplink Dedicated Physical Control Channel (DPCCH) in a first enhanced UL transport channel (E-DCH) is controlled. The control is made by the first base station (11) on the basis of a signal to interference ratio (SIR) target value sent by the first RNC (12). Thereby, the SIR real time value for the UL DPCCH is controlled towards the target value. The first user terminal (15) and the first base station (11) further calculate a power for at least an Enhanced Dedicated Physical Data Channel (E- DPDCH) in the first E-DCH, which power is defined as the sum of the DPCCH power and a power offset. The calculation is at least based on a power offset configuration and an absolute grant provided by the first base station (11), which grant at least set the maximum E-DPDCH power. The first user terminal (15) further transmits the uplink data traffic on the first E-DCH with the controlled DPCCH power and the calculated E-DPDCH power. What particularly characterises the present invention is that when the first base station (11) and the first user terminal (15) detects that the E-DPDCH absolute grant is reduced below or increased above a grant threshold, the base station (11) changes the SIR target value. Further, the first base station (11) and the first user terminal (15) compensates the change of the target value by recalculating at least the E-DPDCH power so that the power reflects both the changed DPCCH power resulting from the changed SIR target value and the improvement due to optimized channel estimation in case of changed SIR real time value.</p> |
