2017/03 12 p.
The present document describes the use cases and potential requirements for an optional capability allowing an operator to provide access to restricted local operator services. Based on operator policy, access to these restricted local operator services is allowed for unauthenticated UEs. In such cases, the unauthenticated UE is restricted to only accessing a restricted local operator service. Any other access attempts by the UE are subject to normal 3GPP processing, including authentication.
full Table of Contents for TR 22.820 Word version: 15.0.0