M.4 Bootstrapping architecture and reference points

33.2203GPPGeneric Authentication Architecture (GAA)Generic Bootstrapping Architecture (GBA)TS

M.4.1 Reference point Ub

The reference point Ub is between the UE and the BSF. Reference point Ub provides mutual authentication between the UE and the BSF. It allows the UE to bootstrap the session keys based on SIP Digest credentials.

M.4.2 Reference point Ua

The reference point Ua carries the application protocol, which is secured using the keys material agreed between UE and BSF as a result of the run of the protocol over reference point Ub.

M.4.3 Reference point Zh

The reference point Zh used between the BSF and the HSS allows the BSF to fetch the required authentication information and all GBA user security settings from the HSS. The reference point Zh is an intra-operator domain interface.

M.4.4 Reference point Zn

The reference point Zn is used by the NAF to fetch the key material agreed during a previous protocol run over the reference point Ub from the UE to the BSF. It is also used to fetch application-specific user security settings from the BSF, if requested by the NAF.

M.4.5 Reference point Dz

The text from clause 4.3.5 applies also here.