power used in the last DL_Power_Averaging_Window_Size time slots of the same RL. The latter applies only after the first DL_Power_Averaging_ Window_Size time slots preceding the activation of this method. The Power_Raise_ Limit and DL_Power_Averaging_Window_Size parameter configuration occur in the UTRAN [11]. 4.3.13.2 Power Control in the Downlink Compressed Mode Compressed mode or slotted power control in uplink or/and downlink aims to recover as fast as possible the SIR close to the target SIR after each transmission gap. Practically, compressed mode intervenes when making measurements into other frequency ranges from single mode WCDMA systems. The same UE behaviour of the preceding section applies to the compressed mode. Since the specifications do not describe the details the UTRAN behaviour during the compressed downlink mode, algorithms of the UL com- press mode may apply. Downlink DPCCH and DPDCH(s) transmission stops during DL compressed mode or in simultaneous DL and UL compressed mode. As [14] puts it, the use of compressed mode has an impact on the link performance as studied in [15] for the uplink compressed mode and for the downlink in [16]. The largest impact occurs at the cell edge, where the difference in the uplink performance between compressed mode and non-compressed mode cases is very small until headroom is less than 4 dB. 4.3.13.3 Power Control in Site Selection Diversity Transmit (SSTD) The UE in SSTD, the optional macro diversity method in soft handover mode, selects one of the cells from its active set to be 'primary', all other cells are classed as 'non primary'. In this context, there are two goals, first to transmit on the downlink from the primary cell, minimizing thereby the interference resulting from multiple transmissions in a soft handover mode. Second, to achieve fast site selection without network inter- vention, thereby maintaining the advantage of the soft handover. To select a primary Transmitted DPDCH symbols imply complex QPSK symbols before spreading which does not conta