ETSI
ETSI TS 129 500 V16.5.0 (2020
3GPP TS 29.500 version 16.5.0 Release 16
6.4.3.4.5.2.1 General ................................................................................................................................. 50
6.4.3.4.5.2.2 Additional scope parameters for S-NSSAI/DNN based overload control by SMF .............. 50
6.4.3.4.5.3 Scope of OCI signalled by an NF Service Consumer ................................................................ 51
6.4.3.4.5.4 Scope of OCI signalled by an SCP ............................................................................................ 53
6.4.3.5 Overload Control Enforcement ............................................................................................................. 53
6.4.3.5.1 Message Throttling .......................................................................................................................... 53
6.4.3.5.2 Loss Algorithm ................................................................................................................................ 53
6.4.3.6 OLC-H feature support ......................................................................................................................... 54
6.4.3.6.1 Indicating supports for the OLC-H feature ...................................................................................... 54
6.5 Support of Stateless NFs .................................................................................................................................. 54
6.5.1 General ........................................................................................................................................................ 54
6.5.2 Stateless AMFs ........................................................................................................................................... 54
6.5.2.1 General .................................................................................................................................................. 54
6.5.2.2 AMF as service consumer ..................................................................................................................... 54
6.5.2.3 AMF as service producer ...................................................................................................................... 55
6.5.3 Stateless NFs (for any 5GC NF type) ......................................................................................................... 56
6.5.3.1 General .................................................................................................................................................. 56
6.5.3.2 Stateless NF as service consumer .......................................................................................................... 56
6.5.3.3 Stateless NF as service producer ........................................................................................................... 56
6.6 Extensibility Mechanisms ................................................................................................................................ 57
6.6.1 General ........................................................................................................................................................ 57
6.6.2 Feature negotiation ..................................................................................................................................... 57
6.6.3 Vendor-specific extensions ......................................................................................................................... 58
6.6.4 Extensibility for Query parameters ............................................................................................................. 59
6.7 Security Mechanisms ....................................................................................................................................... 59
6.7.1 General ........................................................................................................................................................ 59
6.7.2 Transport layer security protection of messages ......................................................................................... 60
6.7.3 Authorization of NF service access ............................................................................................................ 60
6.7.4 Application layer security across PLMN .................................................................................................... 61
6.7.4.1 General .................................................................................................................................................. 61
6.7.4.2 N32 Procedures ..................................................................................................................................... 61
6.7.5 Client credentials assertion and authentication ........................................................................................... 61
6.8 SBI Message Priority Mechanism .................................................................................................................... 62
6.8.1 General ........................................................................................................................................................ 62
6.8.2 Message level priority ................................................................................................................................. 62
6.8.3 Stream priority ............................................................................................................................................ 62
6.8.4 Recommendations when defining SBI Message Priorities ......................................................................... 63
6.8.5 HTTP/2 client behaviour ............................................................................................................................ 63
6.8.6 HTTP/2 server behaviour ............................................................................................................................ 64
6.8.7 HTTP/2 proxy behaviour ............................................................................................................................ 64
6.8.8 DSCP marking of messages ........................................................................................................................ 64
6.9 Discovering the supported communication options ......................................................................................... 64
6.9.1 General ........................................................................................................................................................ 64
6.9.2 Discoverable communication options ......................................................................................................... 65
6.9.2.1 Content-encodings supported in HTTP requests ................................................................................... 65
6.9.2.2 Content-encodings supported in HTTP responses ................................................................................ 65
6.10 Support of Indirect Communication ................................................................................................................. 65
6.10.1 General ........................................................................................................................................................ 65
6.10.2 Routing Mechanisms with SCP Known to the NF ...................................................................................... 66
6.10.2.1 General .................................................................................................................................................. 66
6.10.2.2 HTTP/2 connection management .......................................................................................................... 66
6.10.2.3 Connecting inbound .............................................................................................................................. 66
6.10.2.4 Pseudo-header setting............................................................................................................................ 66
6.10.2.5 3gpp-Sbi-Target-apiRoot header setting ............................................................................................... 68
6.10.2.6 Cache key (ck) query parameter ............................................................................................................ 68
6.10.2A Routing Mechanism with SCP Unknown to the NF ................................................................................... 69
6.10.2A.1 Connecting inbound .............................................................................................................................. 69
6.10.2A.2 HTTP/2 connection management .......................................................................................................... 69
6.10.2A.3 Pseudo-header setting............................................................................................................................ 69
6.10.3 NF Discovery and Selection for indirect communication with Delegated Discovery ................................ 69
6.10.3.1 General .................................................................................................................................................. 69
6.10.3.2 Conveyance of NF Discovery Factors................................................................................................... 70