RRC service states

• Idle Mode:
– After UE is switched on it will camp in the a suitable cell. After camping:
– User is able to send and receive system and cell broadcasting information.
– In the idle mode until it transmits a request to establish RRC connection.

• Cell_DCH
– Entered from Idle Mode or by establishing a DCH from the Cell_FACH state.
– DPCH and physical downlink shared channel (PDSCH) is allocated to UE.
– UE is in this mode until explicit signalling for Cell_FACH.

• Cell_FACH
– No dedicated channel allocated. Data transmitted through RACH and FACH.
– UE listens BCH.
– Cell reselection is performed (RNC is informed).

• Cell_PCH
– UE known at a cell level but can be reached via PCH.
– Usel listens BCH, some terminals also BMC.
– In case of Cell reselection automatically moved to Cell_FACH state.

• URA_PCH
– UE executes the cell update procedure only if the UTRAN Registration Area is changed.
– DCCH can not be used in this state, all the activities initiated by the network through the PCCH or RACH.