The provision of services and service capabilities in a network should not be restricted by the existence of network sharing. Therefore, all new features (or enhancements to existing features) should be specified to work in network sharing environments. If it is not possible to specify complete support for Network Sharing (i.e. PLMNs in a Shared Network has the same features/capabilities and the same operational situation as a stand alone PLMN) then such deviations are documented in this Annex.

A cell with closed/hybrid access can only broadcast one CSG ID but may broadcast several PLMN IDs. If a cell with closed/hybrid access broadcasts several PLMNs (see clauses 5.2 and 5.2a) for a UE supporting shared network or a non-supporting UE that performs the PLMN selection (see clause 4.2.3.2), it is the operator responsibility to coordinate the CSG IDs between the operators' PLMNs. For handover into a shared hybrid or shared CSG cell, the source RAN shall determine a target core network operator for which the UE is a CSG member since otherwise the handover is likely to fail. In case the UE is capable of reporting the subset of the broadcasted PLMN IDs in the target cell to which its CSG membership is verified, the source RAN bases its core network operator selection on this information. If this information is not reported by the UE the selection of a target core network operator is based on pre-configured information in the RAN. For further details on Closed Subscriber Group (CSG) and closed/hybrid access, see TS 36.300 and TS 25.467.