Section: 6 Network Functions 6.1 General
Content: Clause 6 provides the functional description of the Network Functions and network entities and the principles for Network Function and Network Function Service discovery and selection. NG-RAN functions and entities are described in TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [27] and TS 38.401[ NG-RAN; Architecture description ]  [42]. Security functions and entities are described in TS 33.501[ Security architecture and procedures for 5G System ]  [29] and TS 33.535[ Authentication and Key Management for Applications (AKMA) based on 3GPP credentials in the 5G System (5GS) ]  [124]. 5G Media streaming functions are described in TS 26.501[ 5G Media Streaming (5GMS); General description and architecture ]  [135].