4 Overview

29.3093GPPBootstrapping Server Function (GBA BSF) ServicesRelease 17TS

Nbsp is a Service-based interface exhibited by GBA BSF (Generic Bootstrapping Architecture; Bootstrapping Server Function) which is a Network Function that supports the following functionality:

– Allows the NAF and the Push-NAF to fetch the key material agreed during a previous protocol run between the UE and the GBA BSF. It is also used to fetch application-specific user security settings from the GBA BSF, if requested by the NAF.

The reference points N66 and N67 (see Fig 4-1 below) show the interaction between the GBA BSF and the NAF and Push-NAF Network Functions.

Figure 4-1: Reference Model – Nbsp

In the context of the present specification, the GBA BSF is an SBA-capable BSF, and the NAF and Push-NAF are also SBA-capable Network Functions (see 3GPP TS 33.220 [14] and 3GPP TS 33.223 [15]).