3 CT ToR At discontinuation of TSG-T and TSG-CN the new TSG-CT became the “core network and terminal” group Technical tasks –Cellular and IMS protocols –CS and PS domain –UE L3 protocols (CT1) –Interworking with external networks (CT3) –Network interfaces (CT4) –Open Service Architecture, OSA (CT5) –Smart card applications (CT6)
4 3GPP TSG CT CT mission: services via any access network !...and let’s make it IP all the way to the terminal ! Common CN GSM 900 3GHSxPA WLAN LTE EDGE GSM 1800 GPRS GSM 1900 GSM ph.1 R97 R98 R99 Rel-5/6 Rel-6/7 Rel-8 and onwards ?
5 IMS IP Multimedia Subsystem PS domain services only Bearer agnostic –GSM, UMTS, WLAN, fixed xDSL, HSxPA, 3.9G SIP / SDP driven sessions on whatever media Endpoint-to-endpoint or endpoint-to-service –Multimedia, Messaging, Presence, etc –The protocol is there, what are your application needs? IETF defined protocols re-used by 3GPP –Initial version was frozen in Rel-5 –Improvements with more functionality in Rel-6 Presence, messaging, multiple registration, forking,... –Still more optimisations & new functionality in Rel-7 Voice call continuity (between CS & PS), Combinational services (in CS & PS domain) Adaptation to TISPAN fixed network IMS emergency calls IP Multimedia Core SIP Packet- switched network (2G or 3G GPRS or WLAN) SIP
6 WLAN interworking Currently specified for IEEE 802.11, but not restricted to that version Re-use of IEEE WLAN specifications Definition of the architecture Functionality –Detection of the AP’s –Associating with AP –Detection of HPLMN connection –Authentication –Establishment of tunnel to HPLMN packet gateway –Voice call continuity in Rel-7 –WLAN VPN access in Rel-7
7 Some of the main Rel-7 work items CSI (CS and IMS combinational service) –Requires both CS and PS connectivity at the same time –CS domain voice call with additional information e.g. video clip via IMS VCC (Voice Call Continuity) –Voice call continuity between CS domain and PS domain –Transition between CS and PS cells without losing the call IMS evolution –NGN, IMS over fixed access –IMS emergency calls based on SIP emergency sessions –IMS multimedia telephony –Conferencing and messaging enhancements (DM and BFCP)...and several WLAN and traditional cellular protocol evolution work items
8 What’s next... Stabilising Rel-7 Rel-8 Long Term Evolution network architecture adapted via SAE to LTE radio Migration from CS domain voice services to PS domain IMS multimedia services