Abstract

The present invention relates to a method and arrangement for power control of t he F-DPCH (Fractional-Dedicated Physical Control Channel) in a 3rd generation mo bile telecommunication system applying HSDPA, in particular for a user equipment in soft handover. The user equipment derives the TPC command error rate R to ad just the SIR target as the max weighted function of the TPC command error rates of all the radio links in soft handover. According to the choice of weights in t he weighted function, the user equipment can set its SIR target in a way that ei ther all radio links are able to maintain the TPC BER below or equal to the targ et TPC BER that is set bThe present invention relates to a method and arrangemen for power control of the F-DPCH (Fractional- Dedicated Physical Control Channel in a 3rd generation mobile telecommunication system applying HSDPA, i particular for a user equipment in soft handover. Such user equipments may not experience the same bit error ratio (BER) on different radio uplinks and, thus, it is not specified how a user equipment in soft handover derives the SIR targe for the inner loop. The user equipment derives the TPC command error rate R adjust the SIR target as the max weighted function of the TPC command error rat es of all the radio links in soft handover. According to the choice of weights i the weighted function, the user equipment can set its SIR target in a way that either all radio links are able to maintain the TPC BER below or equal to the t arget TPC BER that is set by the network. The user equipment can also choose the weights such that the target TPC error rate is met only on the serving HS-DSCH.

IPC Classes  ?

• H04B 7/005 - Control of transmission; Equalising