Section: 4.15.9.3 Time Synchronization activation, modification and deactivation 4.15.9.3.1 General
Content: This procedure can be used by the AF to activate, modify or deactivate the (g)PTP instances in 5GS. The AF may activate the time synchronization service using the Nnef_TimeSynchronization_ConfigCreate service operation. The service operation creates a time synchronization configuration based on the service parameters as indicated in the create request. The AF may update the time synchronization configuration using the Nnef_TimeSynchronization_ConfigUpdate service operation. The AF may deactivate the time synchronization service using the Nnef_TimeSynchronization_ConfigDelete service operation, which deletes the corresponding time synchronization service configuration. The AF may subscribe to time synchronization status report by providing clock quality acceptance criteria via Nnef_TimeSynchronization_ConfigCreate service operation. The AF may receive time synchronization service status update via Nnef_TimeSynchronization_UpdateNotify service operation. 5GS may provide a time synchronization status report to the AF in case of a PTP port is activated or deactivated due to a detected failure, degradation, or improvement of the service. The Nnef_TimeSynchronization_ConfigCreate and Nnef_TimeSynchronization_ConfigUpdate request may contain the parameters as described in Table 4.15.9.3-1. Table 4.15.9.3-1: Description of Time Synchronization service parameters The AF may use Nnef_TimeSynchronization_CapsSubscribe service operation as described in clause 4.15.9.2 to learn the UE capabilities for time synchronization service. The Nnef_TimeSynchronization_CapsNotify service operation indicates the list of UE identities, User-plane Node ID and the Subscription Correlation ID. The AF can use the Subscription Correlation ID and the user-plane node ID received in the Nnef_TimeSynchronization_CapsNotify service operation as a target of the Nnef_TimeSynchronization_ConfigCreate request. The NEF uses the Subscription Correlation ID and user-plane node ID to determine the list of UEs and list of AF-sessions to which the Nnef_TimeSynchronization_ConfigCreate service operation is targeted to.