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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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contents
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
from gsm to multi access
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 !

slide5

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

system architecture evolution sae
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
sae lte deployment
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
ip multimedia subsystem ims

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

common ims
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
multi mode service continuity
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
multi mode ims registration in rel 7
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

multi mode ims multiple registration rel 8
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

multi mode single radio voice call continuity
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

multi mode cs fallback
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

multi mode network selection
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
multi mode network selection outbound roaming example
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

sae architecture 23 401
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)

sae non 3gpp access 23 402

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