DL - 4G Americas

A UE can connect to one PDN 125 over a 3GPP access (e.g. for VoIP/IMS) and to a second PDN over a
non-3GPP access (e.g. for HSI over Wi-Fi), but partial handovers when the UE does not move all its PDN
connections or all the IP flows within a PDN connection from source to target Access are not described in
Rel-8 or Rel-9. This partial handover case is addressed through the following Rel-10 enhancements to
the core packet network:
� Authentication-only, “non-seamless” access to the Internet is authenticated using the 3GPP USIM
credentials of the handset. This type of access is characterized by a new IP address allocated at the
Wi-Fi hotspot that can be used for access to the public Internet through that hotspot; seamless
mobility is not provided with this approach. Use of the 3GPP USIM credentials for authentication is
simpler than manual authentication by the end-user and more secure than the MAC-based
authentication used at some hotspots.
� Multi-Access PDN Connectivity (MAPCON) provides the capability for 3GPP terminals to establish
multiple connections to different PDNs via different access systems. MAPCON provides a selective
transfer of PDN connections between accesses: Upon inter-system handover (e.g. triggered by the
detection by the UE of WLAN coverage in addition to the 3GPP coverage), the UE may transfer only
a subset of the active PDN connections from the source to the target access. This MAPCON feature
is characterized by multiple packet core IP addresses at the UE, any of which may be moved (but
unchanged) between 3GPP and WLAN/Wi-Fi access without impacting the 3GPP access connectivity
of the other IP addresses. This allows that 3GPP systems keep the PDN connection for VoIP/IMS
over 3GPP and only moves the PDN connection for HSI/Internet/VPN over Wi-Fi.
� IP Flow Mobility (IFOM) provides the capability for 3GPP terminals to access a PDN connection via a
non-3GPP WLAN access such as a wireless hotspot, while maintaining connectivity to the same PDN
connection (IP address) via the 3GPP radio. The feature also introduces the infrastructure for IP Flow
Mobility as specified in 3GPP TR 23.261 for seamless mobility of individual IP flows between 3GPP
access and WLAN access. Notably this feature permits individual flows to the same PDN connection
to be routed over different access based on network policy; for example, best-effort traffic may be
routed over WLAN while QOS-sensitive traffic such as voice telephony may be routed only over the
3GPP radio. This feature is characterized at the UE by the ability to move a flow between 3GPP and
WLAN/Wi-Fi.
7.3.8 UICC
Work has started to integrate UICCs with the relay nodes. The Relay Node is a powerful means of
network extension. Its specification started with Rel-9 and is continuing within Rel-10. By essence, a
Relay Node behaves as a User Equipment towards the network. As such, every Relay Node will be
required to use a USIM-based authentication to the network.
Future releases will likely develop another promising feature that will provide the ability for the UICC to
directly send and receive SIP messages to IMS application servers and leverage on the IP Multimedia
Subsystem. This will allow the deployment of applications requiring end-to-end security such as mobile
banking, identity management, and management of the card over a full IP network.
125
PDN = Packet Data Network. Corresponds to an APN. Connection to a PDN implies the allocation of at least an IP address to the
UE
www.4gamericas.org February 2011 Page 76