name: 3GPP TS 23.402
full_form: 3GPP Technical Specification 23.402
context: The primary reason for the interworking between Packet Domains is to support roaming subscribers as described in 3GPP TSÂ 23.060Â [3]. The general model for both GPRS and EPS Packet Domain interworking is shown in figure 21.
  Figure 21: General interworking model for GPRS Packet Domains and EPS Packet Domains to support roaming subscribers.
  NOTE:	There may be multiple Packet Domains of the same type which interwork each other, such as the case of interwork between two GPRS Packet Domains.
  For roaming subscribers that have a PDP address allocated from the HPLMN a forwarding route between the HPLMN and the VPLMN is created. This route is used for both mobile terminated and mobile originated data traffic. The communication is done via the BGs (Border Gateways) as described in 3GPP TSÂ 23.060Â [3].
  The procedures to set the link between the SGSN in the VPLMN and the GGSN in the HPLMN are described in 3GPPÂ TSÂ 23.060Â [3].
  The inter-PLMN link may be any packet data network or dedicated link as described in 3GPP TSÂ 23.060Â [3]. The PLMN operators may have a dedicated inter-PLMN link to fulfil the QoS requirements of a certain protocol.
  In the case of interworking between EPS Packet Domains, S8 reference point is the inter-PLMN interface, linking PDN GW of HPLMN and Serving GW of VPLMN.  The procedure for setting the link is described in 3GPP TSÂ 23.401Â [77] and TSÂ 23.402Â [78].
description: This specification describes the procedures for setting up links between Serving GWs in different PLMNs.
explanation: Categorized as a Specification since it outlines technical requirements and standards.
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