23.1213GPPArchitectural requirements for Release 1999Release 1999TS
During non-transient conditions the following relations are valid between service states and RRC modes for an UE:
– when in either CS-CONNECTED state or PS-CONNECTED state, or in both CS-CONNECTED state and PS-CONNECTED state, then the UE is in RRC connected mode;
– when in neither CS-CONNECTED state nor PS-CONNECTED state, then the UE is in RRC idle mode.
Figure 4.12 and figure 4.13 illustrate two examples on the relations between the RRC states and CS/PS service states. These figures illustrate the separated CN case.
Figure 4.12: UE in CS-CONNECTED state and PS-IDLE state