6.8 Relationship between CS and PS service states and RRC state for an UE

23.2213GPPArchitectural requirementsRelease 17TS

This clause describes the relationship for the UTRAN. In E-UTRAN the RRC operates for PS services only despite some extensions for supporting the provision of CS services via GERAN/UTRAN.

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 6.5 and figure 6.6 illustrate two examples on the relations between the UTRAN RRC states and CS/PS service states.

Figure 6.5: UE in CS-CONNECTED state and PS-IDLE state

Figure 6.6: UE in CS-IDLE state and PS-DETACHED state