name: S-GW
full_form: Serving and Packet Data Network Gateway
context: A UE that has obtained an IPv6 address can use stateless DHCP to request other configuration information such as a list of DNS recursive name servers or SIP servers.
  For 3GPP networks if such IPv6 configuration parameters are locally provisioned in the P-GW, the P-GW returns the requested parameters to the UE via its DHCPv6 server function. For trusted non-3gpp access networks, if such IPv6 configuration parameters are locally provisioned in the P-GW, the P-GW may return the requested parameters to the UE via its DHCPv6 server function or the P-GW may return the IPv6 configuration parameters to the non-3gpp access network and then the non-3GPP access network may send the parameters to the UE via its DHCPv6 server function. When the non-3GPP access network is a trusted WLAN network, the PGW always returns the IPv6 configuration parameters to the TWAN via GTP/PMIP message, and then the TWAN sends the parameters to the UE via its DHCPv6 server function. When an external DHCP6 server in a PDN is used to obtain the requested parameters, which is the use case covered in this subclause, the P-GW acts as a DHCPv6 client towards the external DHCPv6 server while acting a DHCPv6 server towards the UE.
  The IPv6 parameter configuration via stateles DHCPv6 function in the UE, the P-GW and the external DHCPv6 Server shall be compliant to RFC 3736Â [80]. An example signalling flow for the GGSN is described in Subclause 13.2.2. For the P-GW, the signalling flow is same with the following modifications:
  -	For 3GPP access networks, the P-GW sends Router Advertisement for GTP-based S5/S8. In the case of PMIP-based S5/S8, the S-GW sends the Router Advertisement. For trusted non-3GPP access networks, the trusted non-3GPP access network sends the Router Advertisement for PMIP S2a.When the non-3GPP access network is a trusted WLAN network, the TWAN sends the Router Advertisement
  As stated above, the P-GW acts as a DHCPv6 server towards the UE, while acting as a DHCPv6 client towards the external DHCPv6 server.
description: The S-GW is a network function that provides connectivity between the UE and external packet data networks. It sends Router Advertisement messages in PMIP-based S5/S8 scenarios.
explanation: Categorized as a Network Function since it manages user sessions and provides connectivity to external networks.
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biotag_Description: O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O