14.4.3 HS-SCCH DRX operation in CELL_FACH state

25.3083GPPHigh Speed Downlink Packet Access (HSDPA)Overall descriptionRelease 17Stage 2TS

For the HS-SCCH DRX operation in CELL_FACH state, the UTRAN indicates an inactivity time, a HS-SCCH DRX cycle length and a HS-SCCH RX burst length. The HS-SCCH DRX operation in CELL_FACH state is only possible when the UE has a dedicated H-RNTI configured.

If HS-SCCH DRX operation in CELL_FACH state is configured, the UE shall follow HS-SCCH DRX operation in CELL_FACH state even if the UE supports and the UTRAN configures HS-DSCH DRX operation with second DRX cycle in CELL_FACH or HS-DSCH DRX operation in CELL_FACH state.

The HS-SCCH DRX operation in CELL_FACH state is initialized when the inactivity timer expires. The inactivity timer is triggered whenever no data transmission activities are ongoing. At this point, the UE shall only monitor HS-SCCH order for the HS-SCCH DRX burst length. If the UE receives HS-SCCH order, it starts receiving HS-DSCH continuously 8ms after the HS-SCCH order. This operation is illustrated in Figure 14.4.3-1.

Figure 14.4.3-1: Discontinuous HS-SCCH reception in CELL_FACH state