Section: 6.21.2.2 Indirect network sharing
Content: The 5G system shall be able to support Indirect Network Sharing between the Shared NG-RAN and one or more Participating NG-RAN Operators’ core networks, by means of the connection being routed through the Hosting NG-RAN Operator’s core network. NOTE 1: Requirements of Indirect Network Sharing assume no impact on UE. NOTE 2: For more information on Indirect Network Sharing see Annex I. The following requirements apply to Indirect Network Sharing: Indirect Network Sharing shall be transparent to the user. NOTE 3: This requirement is aligned with the existing requirement in 3GPP TS 22.101[ Service aspects; Service principles ]  [6] clause 4.9. The following existing service requirements related to network sharing in 3GPP TS 22.101[ Service aspects; Service principles ]  [6] apply: - clause 4.2.1, - clause 28.2.3, and - clause 28.2.5. Subject to the agreement between the hosting and participating operator, the 5G system shall support a means to enable a UE of the Participating NG-RAN Operator to: - access their subscribed PLMN services when accessing a Shared NG-RAN, and/or, - obtain its subscribed services, including Hosted Services, of participating operator via a Shared NG-RAN. Based on operator policy, the 5G system shall support a mechanism to enable an authorized UE with a subscription to a Participating Operator to select and access a Shared NG-RAN. Based on operator policy, the 5G system shall support access control for an authorized UE accessing a Shared NG-RAN and be able to apply differentiated access control for different Shared NG-RANs when more than one Shared NG-RAN are available for the Participating Operator to choose from. Based on operator policy, the 5G system shall enable the Participating Operator to provide steering information in order to assist a UE with access network selection amongst the Hosting Operator’s available Shared RAN(s). The 5G system shall support service continuity for UEs that are moving between different Shared NG-RANs and/or between a Shared NG-RAN and a non-Shared NG-RAN networks. The 5G system shall be able to provide a UE accessing a Shared NG-RAN network with positioning service in compliance with regulatory requirements. Subject to regulatory requirements and mutual agreement between the participating operators and the hosting operator, the requirements to support regulatory services, e.g., PWS or emergency calls apply to Indirect Network Sharing. In case of Indirect Network Sharing and subject to agreement between operators the 5G system shall enable the Shared NG-RAN of a hosting operator to provide services for inbound roaming users. The 5G core network shall be able to support collection of charging information associated with a UE accessing a Shared NG-RAN using Indirect Network Sharing, which refers to the resource usage of hosting operator’s core network.