Section: 5.2.2.2.13 Namf_Communication_EBIAssignment service operation
Content: Service operation name: Namf_Communication_EBIAssignment. Description: The consumer NF uses this service operation to request a bunch of EPS Bearer IDs for a PDU Session and optionally indicate to the AMF the list of EBI(s) to be released. Inputs, Required: SUPI, PDU Session ID, ARP list. Input, Optional: Released EBI list. Outputs, Required: None. Outputs, Optional: a list of <ARP, EBI> pair, <ARP, Cause> pair. The consumer NF invokes the Namf_Communication_EBIAssignment service operation when it determines that one or more EPS Bearer IDs are required for EPS QoS mapping for a PDU Session. The ARP list indicates the number of the requested EBIs and the corresponding ARP. The AMF uses the ARP list (including ARP priority level, the pre-emption capability and the pre-emption vulnerability) and the S-NSSAI to prioritize the EBI request, AMF can revoke the EBI from an ongoing lower priority PDU Session, if the maximum number of EBIs have been reached and a session with a higher priority requests an EBI. The AMF responds the consumer NF with a cause which indicates whether the assignment is successful or not. If the assignment is successful, the AMF provides a list of <ARP, EBI> pair to the consumer NF. If the consumer NF determines that some EBIs are not needed, the consumer NF indicates the EBI(s) that can be released in the Released EBI list.