name: Gi
full_form: GPRS Interworking
context: Figure 9: Example of the PDN Interworking Model, transparent case
  In figure 9, an example PDN interworking model for transparent access to the Internet is provided for a GGSN and its Gi reference point.
  In transparent access to the Internet case:
  -	the MS is given an IPv4 address and/or an IPv6 prefix belonging to the operator addressing space. The IPv4 address and/or IPv6 prefix is assigned either at subscription in which case it is a static address or at IP-CAN session establishment in which case it is a dynamic address. This IPv4 address and/or IPv6 prefix if applicable is used for packet forwarding between the Internet and the GGSN/P-GW and within the packet domain. With IPv6, Stateless Address Autoconfiguration shall be used to assign an IPv6 address to the MS. These procedures are as described in the IPv6 non-transparent access case except that the addresses belong to the operator addressing space.
  -	the MS need not send any authentication request at IP-CAN session establishment procedure and the GGSN/P-GW need not take any part in the user authentication/authorization process.
  The transparent case provides at least a basic ISP service. As a consequence of this it may therefore provide a bearer service for a tunnel to a private Intranet.
  Note that the remainder of this subclause deals with this specific use-case as depicted in figure 10.
  -	The user level configuration may be carried out between the TE and the intranet, the Packet Domain network is transparent to this procedure.
  The used protocol stack is depicted in figure 10.
  Figure 10: Transparent access to an Intranet
  In figure 10, an example for transparent access to an Intranet is provided for a GGSN and its Gi reference point, but the same principle is applicable to EPC.
  The communication between the PLMN and the Intranet may be performed over any network, even an insecure network e.g. the Internet. There is no specific security protocol between the GGSN and the Intranet because security is ensured on an end to end basis between the MS and the intranet by the "Intranet Protocol".
  User authentication and encryption of user data are done within the "Intranet Protocol" if either of them is needed. This "Intranet Protocol" may also carry private (IP) addresses belonging to the address space of the Intranet.
  An example of an "Intranet Protocol" is Ipsec (see RFCÂ 1825Â [61]). If Ipsec is used for this purpose then Ipsec authentication header or security header may be used for user (data) authentication and for the confidentiality of user data (see RFCÂ 1826Â [62] and RFCÂ 1827Â [63]). In this case private IP tunnelling within public IP takes place.
description: The Gi reference point refers to the interface between the GGSN and the external packet network.
explanation: Gi is an Interface as it enables communication between the GGSN and external networks.
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biotag_Description: O,B-Interface,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O