Authorization of application function for policy management

A first network node providing a network exposure function, the first network node comprising:

• a transceiver;
• and
• a processor, wherein the transceiver and the processor are configured to:
• receive, from a second network node providing an application function, a first request message comprising a request for resources for a quality of service (QOS) training session for the application function, the first request message indicating one or more wireless transmit/receive units (WTRUs) for the QoS training session;
• send, to a third network node providing binding support management, a discovery request message requesting identification of one or more policy control functions serving the one or more WTRUs for the QoS training session;
• receive, from the third network node, a discovery response message indicating identifications of the one or more policy control functions serving the one or more WTRUs;
• send, to one or more network nodes providing the one or more policy control functions, a second request message to request authorization for the QoS training session for the application function for the one or more WTRUs;
• receive, from the one or more network nodes providing the one or more policy control functions, one or more response messages with policy authorization results for each of the one or more WTRUs;
• and
• send, to the second network node providing the application function, a QoS create response message identifying one or more of the one or more WTRUs for which the request for resources for the QoS training session for the application function are granted according to the policy authorization results.