name: CSG
full_form: Closed Subscriber Group
context: for each connectivity - Binding the H(e)NB with UE ID - Checking whether the H(e)NB is authenticated by the network - With authentication of H(e)NB by the UE, this is to prevent issues like UE connecting to a wrong H(e)NB, UE disconnected by a rogue H(e)NB leading to change in Allowed CSG List etc. - Deployment security also considering migration Figure 11: High level message sequence for access list management and access control for the CSG case. TS 22.220 contains the following requirement regarding the storage of CSG Lists and CSG Type in the USIM of the UE: "The UE shall contain a user controlled list of allowed CSG identities (Allowed CSG List). It shall be possible to store the Allowed CSG List in the USIM. When available, the list on the USIM shall be used." "In addition to the Allowed CSG list, the UE shall maintain an operator controlled list of allowed CSG identities (Operator CSG list). It shall be possible to store the Operator CSG list in the USIM. When available, the
description: A Closed Subscriber Group (CSG) is a list of allowed subscriber identities used to control access to specific services or networks. It is stored in the user's USIM card and managed by both the user and the operator. CSGs are primarily used in Home (e)NodeB deployments for network security and subscriber management.
explanation: While related to subscribers, a CSG functions as a mechanism to control access based on predefined identities. This aligns it with access control mechanisms rather than broader categories like Network Function or Protocol.
section_title: 7.9.3.1	Overall Model and Requirements
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