name: BSF
full_form: Bootstrapping Function
context: In this scenario, the NAF does not use USSs and the BSF does have a local policy for this NAF. 1. The NAF requests the NAF specific shared key(s) from the BSF. It does not include any GSIDs in the request. 2. The BSF locates the subscriber information in its local memory using the B-TID. 3. The BSF checks whether a local policy exists for the NAF - in this scenario there is a local policy for this NAF, i.e. for this particular NAF, the BSF does not require any USSs (identified by GSIDs) to be present in subscriber's GUSS. The BSF checks whether all the required USSs identified by GSIDs are present in subscriber's GUSS: If yes, the BSF continues from step 4. If not, the BSF the BSF sends an error message to the NAF. NOTE: As specified in clause 4.4.6, it is not required that the NAF requests the USSs over the Zn reference point, which the BSF requires to be present in the GUSS for particular NAF, rather it is sufficient that the BSF checks the presence of the USSs locally. 4. The BSF
description: The Bootstrapping Function (BSF) is a network function responsible for managing and providing bootstrapping information, such as shared keys, to Network Application Functions (NAFs). It also checks the presence of required User Security Services (USSs) in the subscriber's Generic User Security Service (GUSS) based on local policies.
explanation: The BSF is classified as a Network Function because it performs specific tasks related to bootstrapping and security, such as locating subscriber information, checking local policies, and verifying the presence of USSs. The context highlights its role in managing and providing bootstrapping information to NAFs.
section_title: J.2.2	Scenario 2: NAF does not use USSs, BSF does have local policy for NAF
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biotag_Description: O,B-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O