3GPP - 4G Americas

• SWn: The SWn interface is the reference point between the Untrusted non-3GPP IP Access
and the ePDG, is has the same functionality as Wn which is defined in TS 23.234 for
interworking between 3GPP systems and WLAN.
• SWu: The SWu interface handles the support for IPSec tunnels between the UE and the
ePDG
• SWx: The SWx interface is used for transport of authentication data between 3GPP AAA
Server and HSS
• S101: The S101 interface enables interactions between MME of EPS and eAN/PCF of CDMA
access to allow for pre-registration and handover execution signaling between EPS and
CDMA for an optimized handover
• S102: S102 is a special interface used for voice call handover between EPS and 1xRTT
network. The S102 reference point is used to convey 3GPP2 1x CS signaling messages
between the MME and 3GPP2 1x CS IWS. These 1x CS signaling messages are actually
exchanged between the UE and the 3GPP2 1x CS IWS, and S102 is only one link in the
overall UE-1x CS IWS tunneling path. On the remaining portion of the tunneling path, the
3GPP2 1x CS signaling messages are encapsulated in E-UTRAN/EPS tunneling messages
(UE-MME).
• S103: S103 is the User Plane interface between SGW of EPS and HSGW of CDMA is used
to bearer data connections to minimize packet losses in mobility from EPS to HRPD in an
optimized handover
www.3GAmericas.org February 2009 Page 48