What are the basic HSDPA concepts for increasing the user data rate? $($select all that apply$)$

Hybrid Automatic Retransmission Requests $($HARQ$)$ are used to detect transmission errors very quickly and to retransmit the data

PCH is monitored so that incoming notifications can be addressed

Less flexibility for bursty data transfer

Use adaptive modulation and coding

Ciphering between the mobile device and the network is activated

intelligent scheduling can be used to reduce the data rate to a subscriber while signal conditions are temporarily bad and to increase the data rate again once conditions have improved

HSDPA users can receive data via several code channels simultaneously