name: SLF
full_form: Subscriber Locator Function
context: of a set of HSSs. Similar functionality will be needed for 5G. The SLF need to analyse an attach request of a user first and routes it to the correct HSS. If one of the solutions as sketched above is used, the SLF may need to have additional tasks to fulfil before routing is possible. E.g. if the home operator uses an SLF to split its set of subscribers, the SLF would need to evaluate (or decrypt) the received privacy protected identifiers first. Thus, in a 5G network where the permanent subscriber identity (IMSI) is encrypted, an SLF would need to take over the decryption. Further the SLF would need to keep a database of all subscribersâ profile with the routing information, i.e. profile should map a subscribers permanent identity (IMSI) to one of the HSSs in the network to forward the request for authentication vectors after decrypting the received (encrypted) IMSI. Therefore, instead of an HSS public/private key pair, now the SLF would need to store and use the home network private
description: The Subscriber Locator Function (SLF) is a network component responsible for locating and routing subscriber requests within a telecommunications network. It analyzes attach requests from users, evaluates privacy-protected identifiers, and directs them to the correct Home Subscriber Server (HSS). The SLF maintains a database of subscribers' profiles with routing information, mapping permanent identities (IMSI) to specific HSSs in the network.
explanation: The context explicitly describes the role of the SLF as a critical component within the telecommunications network, handling subscriber requests and directing them to the correct HSS. This functionality aligns with the definition of a Network Function, which includes components that manage and control network operations.
section_title: 5.7.4.22	Solution #7.22: Efficient handling of privacy protected AV requests
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