The protocol used on the Nc interface shall be a call control protocol supporting IP and ATM transports in a
bearer-independent manner for the ISDN service set, allowing the physical separation of the call control entities from
the bearer control entities.
The Np reference point enables transport of RAN User Plane Congestion Information (RUCI) sent from the RCAF to
the PCRF for all or selected subscribers, depending on the operator's congestion mitigation policy.
The Np reference point supports the following functions:
Reporting of RUCI from the RCAF to the PCRF.
Sending, updating and removal of the reporting restrictions from the PCRF to the RCAF.
This PCF service provides Access Control,
network selection and Mobility Management
related policies, UE Route Selection Policies
to the NF consumers.
This PCF service provides session related
policies to the NF consumers
This PCF service authorises an AF request
and creates policies as requested by the
authorised AF for the PDU Session to which
the AF session is bound to. This service
allows the NF consumer to
subscribe/unsubscribe to the notification of
Access Type and RAT type, PLMN identifier,
access network information, usage report...