DPCCH and HS-DPCCH control at low grants for E-DCH

An enhanced uplink (UL) telecommunication system comprising mechanisms arranged for power control, the system comprising at least one first radio network controller (RNC) and at least one first base station enabling wireless communication with at least one first user terminal,

• the first base station comprising a mechanism arranged for controlling the power for an uplink Dedicated Physical Control Channel (DPCCH) in a first enhanced UL transport channel (E-DCH) on the basis of a signal to interference ratio (SIR) target value sent by the first RNC so that the SIR real time value for the UL DPCCH is controlled towards the target value,
• a mechanism in the first user terminal and the first base station mechanism are arranged for calculating a power for at least an Enhanced Dedicated Physical Data Channel (E-DPDCH) in the first E-DCH, the power being defined as the sum of the DPCCH power and a power offset, the calculation at least being based on a power offset configuration and an absolute grant provided by the first base station, which grant at least set the maximum E-DPDCH power,
• the first user terminal mechanism is arranged for transmitting the uplink data traffic on the first E-DCH with the controlled DPCCH power and the calculated E-DPDCH power,
• wherein
• the first base station mechanism is arranged for changing the SIR target value when the first base station and the first user terminal detects that the E-DPDCH absolute grant is reduced below or increased above a certain value,
• the first base station mechanism and the first user terminal mechanism are arranged for compensating 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.

A base station comprising a mechanism arranged for power control in an enhanced uplink (UL) telecommunication system further comprising at least one first radio network controller (RNC), the at least one first base station enabling wireless communication with at least one first user terminal,

• the first base station mechanism is arranged for controlling the power for an uplink Dedicated Physical Control Channel (DPCCH) in a first enhanced UL transport channel (E-DCH) on the basis of a signal to interference ratio (SIR) target value sent by the first RNC, so that the SIR real time value for the UL DPCCH is controlled towards the target value,
• the first base station mechanism is arranged for calculating a power for at least an Enhanced Dedicated Physical Data Channel (E-DPDCH), the power being defined as the sum of the DPCCH power and a power offset, the calculation at least being based on a power offset configuration and an absolute grant provided by the first base station, which grant at least set the maximum E-DPDCH power,
• wherein
• the first base station mechanism is arranged for changing the SIR target value when the first base station and the first user terminal detects that the E-DPDCH absolute grant is reduced below or increased above a grant threshold,
• the first base station mechanism is arranged for compensating 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.

A user terminal comprising a mechanism arranged for power control in an enhanced uplink (UL) telecommunication system further comprising at least one first radio network controller (RNC) and at least one first base station enabling wireless communication with at least one first user terminal,

• the first base station controlling the power for an uplink Dedicated Physical Control Channel (DPCCH) in a first enhanced UL transport channel (E-DCH) on the basis of a signal to interference ratio (SIR) target value sent by the first RNC, so that the SIR real time value for the UL DPCCH is controlled towards the target value,
• the first user terminal mechanism is arranged for calculating a power for at least an Enhanced Dedicated Physical Data Channel (E-DPDCH), the power being defined as the sum of the DPCCH power and a power offset, the calculation at least being based on a power offset configuration and an absolute grant provided by the first base station, which grant at least set the maximum E-DPDCH power,
• the first user terminal mechanism is arranged for transmitting the uplink data traffic on the first E-DCH with the controlled DPPCH power and the calculated E-DPDCH power,
• wherein
• the first user terminal mechanism is arranged for changing the SIR target value when the first base station detects that the E-DPDCH absolute grant is reduced below or increased above a grant threshold,
• the first user terminal mechanism is arranged for compensating 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.