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UE<br />
LTE-Uu<br />
C1 (OMA DM /OTA)<br />
HeNB<br />
S1-MME<br />
HeNB<br />
GW<br />
www.4gamericas.org February 2011 Page 142<br />
S1-U<br />
VPLMN HPLMN<br />
S1-MME<br />
CSG<br />
List Srv<br />
HSS<br />
S-GW<br />
Figure B.17. Variant 3 with HeNB GW for C-Plane (based on 3GPP TS 23.830).<br />
B.3.2 IMS SERVICE CONTINUITY<br />
S6a<br />
MME<br />
Work on functionality to provide aspects of Service Continuity has been underway in 3GPP for several<br />
releases. Rel-7 saw the definition of Voice Call Continuity (VCC) and Rel-8 built on this to define Service<br />
Continuity (SC) and VCC for Single Radio systems (SRVCC). Rel-9 has added further enhancements to<br />
these features.<br />
In Rel-8, Service Continuity allows a user’s entire session to be continued seamlessly as the user’s<br />
device moves from one access network to another. In Rel-9, this functionality has been enhanced to allow<br />
components of a user’s session to be transferred to, and retrieved from, different devices belonging to the<br />
user. For example, a video call or video stream in progress on a mobile device could be transferred to a<br />
laptop, or even a large-screen TV (assuming both can be provided with an IMS appearance in the<br />
network), for an enhanced user experience and then, if necessary, retrieved to the mobile device.<br />
As well as transferring existing media, the user can add or remove media associated with a session on<br />
multiple devices, all controlled from a single device. These devices may be on different 3GPP, or non-<br />
3GPP, access networks.<br />
B.3.3 IMS CENTRALIZED SERVICES<br />
IMS Centralized Services (ICS) feature was developed in Rel-8 and provides voice services and service<br />
control via IMS mechanisms and enablers, while providing voice media bearers via CS access. Users,<br />
therefore, subscribe to IMS services and can receive those services regardless of whether the voice<br />
media is carried over PS access or CS access. Within the limitations of the CS access capabilities, the<br />
user has the same experience of the services.<br />
The services are controlled via a channel that is provided either by IMS (via PS access, if supported<br />
simultaneously with CS access) or through interworking of legacy CS signaling into IMS by the MSC<br />
S11
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