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3GPP presentation Architecture evolution Moscow, October 2008

3GPP presentation Architecture evolution Moscow, October 2008. 3GPP TSG CT Chairman Hannu Hietalahti. Contents. Migration from GSM to multi-access IP multimedia From GSM to multi-access SIM/USIM/ISIM support Security evolution System Architecture Evolution (SAE) IMS

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3GPP presentation Architecture evolution Moscow, October 2008

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  1. 3GPP presentationArchitecture evolutionMoscow, October 2008 • 3GPP TSG CT Chairman • Hannu Hietalahti

  2. Contents Migration from GSM to multi-access IP multimedia • From GSM to multi-access • SIM/USIM/ISIM support • Security evolution • System Architecture Evolution (SAE) • IMS • Multi-mode terminals and networks • Service continuity • Multiple registration • Voice Call Continuity • CS Fallback • Network selection

  3. From GSM to multi-access Continuous improvement of access technologies Provision of services over any access network Common Core network Packet Cable GSM 1900 WiMAX? 3G HSPA GSM 1800 Fixed GSM 900 E-UTRAN GPRS EDGE WLAN ? Rel-5/6 GSM ph.1 Rel-6/7 Rel-8 and onwards R97 R98 R99 ...and let’s make it IP all the way to the terminal !

  4. SIM / USIM / ISIM support ???

  5. UICC Smartcard, R99 -> SIM Appl ISIM Appl USIM Application 2G AKA 2G AKA 3G AKA 3G AKA RAND RAND RAND SRES Kc SRES Kc Security evolution SIM security in USIM Phase 2 SIM SIM 2G AKA RAND+ AUTN +AUTN RAND RES Ck Ik RES Ck Ik SRES Kc SIM application in UICC GSM security IMS 3G AKA in ISIM 3G AKA in UICC SIP 401 Unauthorised Authentication Request (RAND) , AUTN

  6. System Architecture Evolution (SAE) • LTE = E-UTRAN = evolved radio network • Megabit class data rates • Short delays • Short transition from idle to active • SAE = System Architecture evolution • Evolved IP oriented multi access architecture • E-UTRAN integrates only to SAE, A/Gb or Iu not possible • Strongly IP based PS only network • SAE covers both 3GPP and non-3GPP access technologies • Seamless roaming between E-UTRAN, 2G and 3G (tight interworking) • Loose interworking with non-3GPP accesses • Currently work is progressing on GTP for intra-3GPP mobility and IETF based mobility for non-3GPP mobility • The main Architecture specifications 23.401 and 23.402 frozen in June 2008 • Protocol work is ongoing with the goal to freeze it in December 2008

  7. SAE/LTE Deployment • Deployments are expected to start with overlapping cellular coverage • E-UTRAN overlapping with legacy 3GPP GERAN / UTRAN coverage • E-UTRAN overlapping with legacy 3GPP2 coverage • Multi-mode networks and terminals • E-UTRAN is a packet-only radio with no CS capacity • Initially E-UTRAN is foreseen as “islands” in the sea of legacy cellular access • Mobility between E-UTRAN and legacy access is required • Mobility between PS and CS domains is required • Multi-mode terminals expect to use PS coverage where available • Desire to keep the connectivity and services

  8. IP Multimedia Core IP Multimedia Subsystem (IMS) • PS domain IP Multimedia service platform • Based on open IETF standards • End to end IP (SIP) • Multi access • GPRS, I-WLAN, fixed xDSL, Packet Cable defined • More access technologies to follow... Internet Find & route to destination Circuit-switched network (2G or 3G) PSTN IP connectivity (GPRS, 3G,...) User data Any IP connectivity (3G, WLAN,...) End-to-End IP services

  9. Common IMS • 3GPP members, 3GPP2, WiMAX forum, ETSI TISPAN and CableLabs contribute to 3GPP common IMS specifications • Different requirements are supported in common implementation • All IMS specifications are harmonized to 3GPP specifications • Common parts are defined in 3GPP specifications only • Core IMS entities (CSCFs, AS, UE IMS client,...) + agreed common functions • Other organisations either reference or re-use 3GPP specification as it stands • Any changes or additions in the Common IMS area are made in 3GPP • All 3GPP members can contribute on their favourite work items • Ongoing work initiated by 3GPP members, CableLabs, 3GPP2 and ETSI TISPAN • The scope and coverage of Common IMS have been agreed by the SDOs • Common version of IMS specifications in Rel-8 • Business or architecture specific additions to 3GPP Common IMS are possible outside the agreed Common IMS area

  10. Multi-mode,Service continuity • Call control protocols • E-UTRAN is a PS only radio, speech and other services are IMS based • PS domain IMS uses SIP protocol for call control (3GPP TS 24.229) • CS domain uses Call Control defined in 3GPP TS 24.008 • Voice Call Continuity • Domain transfer of ongoing call • Typically from E-UTRAN to 2G or 3G access • CS fallback • Paging the mobile in E-UTRAN to start CS service in 2G or 3G access • Not an E-UTRAN service, but fallback to existing service via 2G/3G • IMS service continuity • IMS service between E-UTRAN and other PS only, such as WLAN • IMS Centralized Service Control (ICS) • Common telephony services between CS and PS domain

  11. Multi-mode,IMS registration in Rel-7 • When S-CSCF detects that the same UE registers again, it considers this as an update and overwrites existing registration • In some cases it may not be possible to de-register when changing from one access technology to another • UE might lose radio coverage before being able to de-register • S-CSCF detects that the registration is from the same UE based on the same privateID, which is practically a device-ID UE (privateID-A) S-CSCF REGISTER 1 (privateID-A, IPaddress: 1.2.3.4) UE registered with 1.2.3.4 loss of radio REGISTER 2 (privateID-A, IPaddress: a.b.c.d) UE registered ONLY with a.b.c.d – REGISTER 1 got overwritten with REGISTER 2

  12. Multi-mode,IMS Multiple registration, Rel-8 • A UE is able to register the same public user identity with multiple IP addresses at the same time • Used e.g. for IMS Service Continuity (e.g. handing over from I-WLAN to GPRS) • No gap in reachability of the mobile HSS GPRS IP: 1.2.3.4 P-CSCF 1 S-CSCF I-WLAN IP: a.b.c.d P-CSCF 2 user1 / 1.2.3.4 / UE-A user1 / a.b.c.d / UE-A UE-A

  13. Multi-mode,Single Radio Voice Call Continuity Transfer from E-UTRAN to GERAN with active call (not all entities shown) IMS MME E-UTRAN HO command HO required measurements relocation request relocation response session transfer PLMN serving remote user MSC server prepare HO HO complete 2G or 3G MSC

  14. Multi-mode, CS fallback Directing the UE from E-UTRAN to 2G/3G for CS service MME E-UTRAN paging SETUP PLMN serving remote user paging call setup SETUP paging resp. 2G or 3G MSC

  15. Multi-mode,Network selection • Network selection comprises two parts • Network operator selection (the goal, based on commercial agreement) • Home operator determines which visited operators are preferred • Access technology selection (the means, based on technical criteria) • Serving visited operator determines access technology, frequency band and cell • Multi-mode phones supporting many access technologies are a new challenge • Network selection within each technology is defined for 3GPP and non-3GPP accesses • The combination of multiple technologies is undefined • Two approaches are foreseen in Rel-8 • 3GPP network selection procedures are extended to cover any non-3GPP system that supports ITU-T defined concepts of MCC and MNC • For others the ANDSF can (optionally) download network selection policy • Access technology preference, policy for changing access technology, etc. • MCC = Mobile Country Code • MNC = Mobile Network Code • ANDSF = Access Network Discovery and Selection Function

  16. Multi-mode network selection,Outbound roaming example HPLMN has not configured RAT priority for this VPLMN • HPLMN is not available • Prioritized VPLMNs are listed with no associated RAT in PLMN selector with access technology: • VPLMN5 is not available • VPLMN1 is available • VPLMN2 is available • VPLMN2 is selected via 2G, 3G or E-UTRAN • USIM configured RAT preference possible • After PLMN selection normal idle mode is resumed • Cell & RAT may change within the selected PLMN • Background scan for higher priority network HPLMN PLMN Selector (USIM): VPLMN1 CDMA VPLMN5 VPLMN2 VPLMN1 VPLMN1 VPLMN1 E-UTRAN ? VPLMN2 UTRAN VPLMN2 GERAN VPLMN2 VPLMN2 E-UTRAN RAT = Radio Access Technology, PLMN = Public Land Mobile Network

  17. Thanks for your attention !More information at www.3gpp.org

  18. Architecture Annex:3GPP and non-3GPP access architecture

  19. SAE architecture (23.401) NAS signaling+sign. security Mobility between 3GPP ANs Idle mode UE reachability P-GW and S-GW selection SGSN selection at HO Authentication Bearer establishment UE IP address allocation Packet screening & filtering Policy enforcement Charging support Legal interception Signaling security (UMTS AKA) Mobility anchor Packet routing Idle mode packet buffering & DL initiation Legal interception User plane security (UMTS AKA)

  20. HSS Wx* S6a S4 2G/3G SGSN PCRF S3 Rx+ Rx+ S7 MME S11 SGi Operator’s IP Services (e.g. IMS, PSS etc.) S1-MME Serving Gateway PDN Gateway S10 EUTRAN S5 S6c S1-U S2b Wm* ePDG 3GPP AAA Server S2c S2a Wn* HPLMN Non-3GPP Networks Trusted Non-3GPP IP Access Wu* Trusrted* Non-3GPP IP Access or 3GPP Access Untrusted Non-3GPP IP Access Wa* Ta* UE UE * Untrusted non-3GPP access requires ePDG in the data path SAE non-3GPP access (23.402) S2 for connectivity via non-3GPP acces Untrusted IP access via ePDG Trusted IP access directly to P-GW

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