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Wireless communication netwrks.unit 5...3gpp architecture evolution
- 1. 1 3GPP TSG CTChairman3GPP TSG CT Chairman Hannu HietalahtiHannu Hietalahti 3GPP presentation Architecture evolution Moscow, October 2008
- 2. 2 Migration from GSMto 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 Contents
- 3. 3 Continuous improvement ofaccess technologies Provision of services over any access network ...and let’s make it IP all the way to the terminal ! Common Core network GSM 900 3G HSPA WLAN E-UTRANEDGE GSM 1800 GPRS GSM 1900 GSM ph.1 R97 R98 R99 Rel-5/6 Rel-6/7 Rel-8 and onwards WiMAX? ? Evolved RAN S1 GERAN UTRAN GPRS Core Gb Iu S 3 S8 S 2 S7 Rx+ Home EPC MME UPE S6 Op. IP Serv (IMS, PSS, etc.) Home Inter AS Anchor HSS S6 non 3GPP WLAN S4 S 2 vPCRF S7 hPCRF Visited Network Home Network S9 Visited EPC Evolved RAN S1 SGi UTRAN Iu S 3 S8 S 2 Rx+ Home EPC MME UPE S6 Op. IP Serv (IMS, PSS, etc.) Home Inter AS Anchor HSS S6 non 3GPP WLAN S 2 vPCRF S7 hPCRF Visited Network Home Network S9 * Color coding: red indicates new functional element / interface 3GPP Anchor SGSN S5a From GSM to multi-access Fixed Packet Cable
- 4. 4 SIM / USIM/ ISIM support GSM Ph.2 – R98 R99 – Rel-4 Rel-5 – Rel-7 Rel-8 -> GSM phone UMTS 3G phone IP Multimedia SAE GSM phase 2 Mandatory SIM No USIM support Optional GPRS (R97 ->) WCDMA or EDGE Mandatory SIM USIM support is: Mandatory for WCDMA Optional for GSM/EDGE IMS Mandatory USIM No SIM specs Optional support of legacy SIM ISIM support mandatory for IMS ME WLAN (Rel-6) SAE USIM mandatory for SAE access 3G AKA security SIM access not allowed any more No need to update legacy USIM IMC as alternative to ISIM for non- 3GPP access ???
- 5. 5 Security evolution Phase 2SIM 2G AKA SIM SRES Kc RAND RES Ck Ik RES Ck Ik USIM Application 3G AKA ISIM Appl UICC Smartcard, R99 -> 2G AKA RANDRAND SRES Kc 2G AKA SIM Appl SRES Kc RAND 3G AKA Authentication Request (RAND ) SIP 401 Unauthorised, AUTN GSM security SIM application in UICC 3G AKA in UICC IMS 3G AKA in ISIM +AUTN SIM security in USIM RAND+ AUTN
- 6. 6 • 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 System Architecture Evolution (SAE)
- 7. 7 • Deployments areexpected 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 SAE/LTE Deployment
- 8. 8 Internet 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... Circuit- switched network 2G or 3G( ) IP Multimedi a Core PSTN IP connectivity GPRS,( 3G,...) Find & route to destination User data Any IP connectivity (3G, WLAN,...) End-to-End IP services
- 9. 9 • 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 Common IMS
- 10. 10 • Call controlprotocols – 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 Multi-mode, Service continuity
- 11. 11 Multi-mode, IMS registration inRel-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 E (privateID-A) S-CSCF REGISTER 1 (privateID-A, IPaddress: 1.2.3.4) oss of radio UE registered with 1.2.3.4 REGISTER 2 (privateID-A, IPaddress: a.b.c.d) UE registered ONLY wit a.b.c.d REGISTER 1 got– overwritten with REGISTE
- 12. 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 S-CSCF P-CSCF 1 P-CSCF 2 GPRS IP: 1.2.3.4 UE-A HSS I-WLAN IP: a.b.c.d user1 / 1.2.3.4 / UE-A user1 / a.b.c.d / UE-
- 13. 13 Multi-mode, Single Radio VoiceCall Continuity Transfer from E-UTRAN to GERAN with active call (not all entities shown) PLMN serving remote user MSC server IMS MSC E-UTRAN 2G or 3G measurements HO required MME relocation request prepare HO relocation response session transfer HO command HO complete
- 14. 14 Multi-mode, CS fallback Directingthe UE from E-UTRAN to 2G/3G for CS service PLMN serving remote user MSC E-UTRAN 2G or 3G MME SETUP call setup paging paging paging resp.SETUP
- 15. 15 Multi-mode, Network selection • Networkselection 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. 16 PLMN Selector (USIM): VPLMN5 VPLMN2 VPLMN1 Multi-mode network selection, Outboundroaming example HPLMN VPLMN1 VPLMN 2 VPLMN1 CDMA VPLMN2 GERAN VPLMN1 E-UTRAN ? 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 RAT = Radio Access Technology, PLMN = Public Land Mobile Network VPLMN2 UTRAN VPLMN2 E-UTRAN
- 17. 17 Thanks f oryour at t ent i on ! Mor e i nf or mat i on at www. 3gpp. or g
- 18. 18 Ar chi tect ur e Annex: 3GPP and non- 3GPP access ar chi t ect ur e
- 19. 19 S6a HSS S8 S3 S1-MME S10 UTRAN GERAN SGSN MME S11 Serving GatewayUE “LTE -Uu” E-UTRAN S12 HPLMN VPLMN PCRF S 7 Rx + SGi •Operator’sIP Services (e.g. IMS, PSS etc.) PDN Gateway S1-U S4 Mobility anchor Packet routing Idle mode packet buffering & DL initiation Legal interception UE IP address allocation Packet screening & filtering Policy enforcement Charging support Legal interception 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 SAE architecture (23.401) User plane security (UMTS AKA) Signaling security (UMTS AKA)
- 20. 20 Trusrted* Non-3GPP IP Access or3GPP Access SGi PCRF S7 S6a HSS ePDG S2b Serving Gateway Wn* 3GPP AAA Server Operator’s IP Services (e.g. IMS, PSS etc.) Wm* Wx* Untrusted Non-3GPP IP Access Trusted Non-3GPP IP Access Wa* Ta* HPLMN Non-3GPP Networks S1-U S1-MME EUTRAN 2G/3G SGSN S4 S3 S5 S6c Rx+ Rx+ S2a PDN Gateway MME S11 S10 UE S2c * Untrusted non-3GPP access requires ePDG in the data path UE Wu* S2 for connectiv ity via non-3GPP acces Trusted IP access directly to P-GW Untruste d IP access via ePDG SAE non-3GPP access (23.402)