CSG - Closed Subscriber Group

Introduced in the 3GPP Release 8 specifications, a Closed Subscriber Group is used to describe a specific group of mobiles who are permitted access to a Femto Cell. As a CSG-ID is broadcast from the Femto Cell in the SIB 2 message, only those mobiles who are members of this group will attempt to select the cell.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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