name: GSID
full_form: GAA Service Identifier (GAA)
context: The AP is configured per AS if the particular application or applications served by the AS is in need of an application specific user security setting, see definitions in TS 33.220 [3]. This user security setting may contain the public user identities in the authentication part of the USS. The authorisation part of the USS may contain indications, which of the applications residing on the AP, and the Application Servers behind the AP, a user is allowed to access. NOTE: There are two ways of implementing application specific user security settings (USS). One can either assign a GSID (GAA Service Identifier) to each application and store multiple USS in the BSF/HSS or one can assign a GSID to the AP and store a single USS in the BSF/HSS. In the latter case the USS contains identity and authorization information for all the ASs/applications served by the AP. Unless indicated otherwise, the term "application specific user security settings" refers to both implementation options.
description: The GAA Service Identifier (GSID) is a parameter used in application-specific user security settings for authentication and authorization. It can be assigned to each application or to an Access Point (AP), enabling the storage of multiple User Security Settings (USS) in the Bootstrapping Server Function/Home Subscriber Server (BSF/HSS).
explanation: The GSID is classified as a Parameter because it is used as a specific attribute for controlling access and authorization within the network, as described in the context from 3GPP TS 33.222.
section_title: 6.5.1	Granularity of Authentication and Access Control by AP
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