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Development and evolution of 3GPP Core Network

Hannu Hietalahti, CT chairman

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CT officials• Chairman

– Hannu Hietalahti / Nokia (ETSI)

• Vice Chairs– Gary Jones / T-Mobile (ATIS)– Steve Mecrow / O2 (ETSI)– Akishige Noda / Fujitsu (TTC)

• MCC Support– Kimmo Kymalainen (MCC)

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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)

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3GPP TSG CTCT mission: services via any access network !

...and let’s make it IP all the way to the terminal !

Common CN

GSM 900

3G HSxPA

WLAN LTEEDGE

GSM 1800

GPRS

GSM 1900

GSM ph.1 R97 R98 R99 Rel-5/6 Rel-6/7 Rel-8 and onwards

?

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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 SIPPacket-

switched network

(2G or 3G GPRS

or WLAN)

SIP

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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

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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

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What’s next...

Stabilising Rel-7

Rel-8 Long Term Evolutionnetwork architecture adapted via SAE to LTE radio

Migration from CS domain voice services

to PS domain IMS multimedia services