Implementing LTE with IMSImplementing LTE with IMS
HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com
ETSI IMS Implementation Deployment and TestingSophia Antipolis France, 24/25 November 2010
Rebecca CopelandHead of Strategic SolutionsEuropean Core Networks
Rebecca CopelandHead of Strategic SolutionsEuropean Core Networks
Implementing LTE with IMS
Content
► Role of IMS in LTE
HUAWEI TECHNOLOGIES CO., LTD.Page 22
► Role of IMS in LTE
► Handover SRVCC and ICS
► QoS Evolution
► Migration to a Universal User Database
► Interoperating IM with SMS
Rebecca CopelandHead of Strategic SolutionsEuropean Core Networks
Rebecca CopelandHead of Strategic SolutionsEuropean Core Networks
Sweden
World’s 1st LTEWorld’s 1st LTE--EPC Commercial EPC Commercial
LaunchLaunch
World’s 1st EPC World’s 1st EPC
World’s 1st World’s 1st Commercial PCC Commercial PCC
deployment in EPCdeployment in EPCMajor partnership Major partnership
from 2G/3G to LTEfrom 2G/3G to LTE--EPCEPC
Norway Oslo
USA
Shanghai, Guangzhou
Armenia , Uzbekistan
Germany
Huawei is Leading in LTE/EPC Deployments
Kuwait
PolandLatvia
18+ commercial contracts
60 trials ongoing
HUAWEI TECHNOLOGIES CO., LTD.Page 3
World’s 1st EPC World’s 1st EPC commercial site with commercial site with
end to end QoSend to end QoS
EPCEPC
TeliaSonera: World’s 1st
commercial launched EPC
T-Mobile: major Migration Partner from 2/3G to LTE/EPC
China Mobile: World’s 1st
end to end QoS EPC
Cox: 1st Commercial PCC deployment in EPC
Huawei IMS is now rolling
Europe 19%
CIS 8%
China 30%
Middle East & Africa 18%Asia Pacific
14% American 11%
More than 120 (10Q2) contracts globally
25%
52%
23%
0%
20%
40%
60%
Fixed FMC Mobile
HUAWEI TECHNOLOGIES CO., LTD.Page 4
� Hungary - the earliest large-scale commercial deployment of IMS � Commercial TAS for DT Germany � Large IMS PSTN Migration in Asia, within 4M subscribers� North America, large VoCable network with PC2.0 architecture compliant� An overwhelming market share in China, more than 12M IMS subscribers
DSLDSL
►LTE separates the signalling path from the media path►LTE allows one MME to be paired with any available S-GW
Evolution from GPRS/CS to LTE
IMSIMS
LTELTE
PCRFPCRFHSSHSS
WiMaxWiMax
WLANWLANCSCFCSCF
HUAWEI TECHNOLOGIES CO., LTD.Page 5
DSLDSL
GPRSGPRS
MMEMMELTELTE
The Role of IMS The Role of IMS –– Provide Common Core for LTE as An other Access NetworkProvide Common Core for LTE as Another Access Netwo rk
S-GWS-GW
S-GWS-GWPDNPDN
SGSN GGSN
IP Bearer
OneVoice to VoLTE – IMS is Now Mandatory
ISC
eMSS
MGWI2
Legacy SCP or NGIN
I3cTASCSCF
Mc
SIP
IMS-SSF
Diameter
ISC2G/3G
Roa
min
g &
HO IMSIMS
NAB
Sharing
XDMS
IM
RCSRich Communication Suite
Presence
HUAWEI TECHNOLOGIES CO., LTD.Page 6
The Role of IMS The Role of IMS –– Voice Session Control and service environmentVoice Session Control and service environment
HLR/HSSSvSGs
SIP
EPCEPCMME
SAE GW
SBC
Diameter
LTERoa
min
g &
HO
PCRF
All the components are ready:IMS AS: Common TAS for 2G/3G/LTE/PES/PSSIMS AS: RCS service experienceSDB: HLR/HSS convergence data synchronizationCS: Enhanced MSS for SRVCC & ICSPS: EPC for E2E QoS and SRVCC collaborationTerminals: Unified Soft Client for MMTel and RCS
Attributes►Based on LTE/IMS Voice & IMS services MMTel►Uses IMS AS (the SCC) for transition solution►Parallel handover of signalling and media for faster call set-up ►Low cost terminals that save battery life (Single Radio) ►Can start to retire GPRS as both Voice & Data move to LTE
SR-VCC: Single Radio Voice Call Continuity
IMSIMS ICS ASICS AS
Service Centralisation & Continuity
Sv
Initiate Handover to GPRS Data
LTELTE
HSSHSSImpact
- Requires IMS handover service from day 1- Needs handover client- Has impact on OSS/BSS. IP Bearer
PDNPDN
CSCFCSCFPCRFPCRF
HUAWEI TECHNOLOGIES CO., LTD.Page 7
GPRSGPRS
CS Network
LTE, IMS, GPRS clients
VoiceHandover to CS
Sv
eMSC
LTE Data & Voice media
MMEMME
media is NOT interrupted
LTELTE
SGSN GGSN
33
11
PDNPDN
The Role of IMS The Role of IMS –– Provide Seamless & Efficient Anch or for HandoverProvide Seamless & Efficient Anchor for Handover
22
S-GWS-GW
IMS Centralized Services – Not Just Voice
Mobile CS Core EPC & MBB
A-SBC
xPON & FBB
A-SBC
I/S-CSCF
MMTELSCC: Service Continuity Control
eMSS for ICS &
SRVCC SIP
•Efficient anchor mechanism
•Ensures consistent service
•Ready for user migration
•Centralizes user’s services to save OPEX
HLR/HSS
HUAWEI TECHNOLOGIES CO., LTD.Page 8
LTE HGW
Fixed SIP Phone
CS/LTE Dual modeterminal
2G/3G
Roaming & Handover
The Role of IMS The Role of IMS –– Provide IMS Centralised Services for a Range of ApplicationsProvide IMS Centralised Services for a Range of App lications
Implementation options:• SRVCC IWF can be integrated in
MSC-Server or enhanced MSS• Centralized (in a separate NE) for
several MSC servers.
Policy Control Server
Single
Session ControlSession Control
ApplicationsApplications
Consistent Convergent Policy from the Core
HUAWEI TECHNOLOGIES CO., LTD.Page 9
xDSL/LAN IMS 2G/3G
BRAS SBC GGSN
LTE/SAE
PDSN UGW
CDMA 1XEvdo-Rev
SingleManager
The Role of IMS The Role of IMS –– Access Agnostic Policy and QoSAccess Agnostic Policy and QoS
Session Based QoS for Fine Tuning
• Absolute bandwidth as requested by devices
• Inefficient Input and Output• Expensive and not scalable
Connection Based QoSSimple ClassificationIntServ
QoS Control
QoS Control
• Controlled by edge devices• Relative Priority Policy only
Flow Based QoS DiffServRough Classification
HUAWEI TECHNOLOGIES CO., LTD.Page 10
Session Flow A
QoS Request
Session Flow B
Session Based QoS
• Controlled by Core server• Differentiated Policy with CAC • Per session, user and service• Best network resource usage
Precision Classification
IMSIMS
• Relative Priority Policy only• Cannot avoid congestion • Low precision control
QoS Control
PCRF
The Role of IMS The Role of IMS –– Finely Tuned User/Session based Policy Finely Tuned User/Session based Policy
End-to-End QoS
E2E QoS Functions Distribution
RAN EPCLTE UE IMS IP Network
E-UTRAN
MME
Rx
GxRadio Bearer QoSRadio Bearer QoS
Network Centric Unified Dynamic
QoS Control
IP Transport Network
Transport Bearer QoSTransport Bearer QoS
PCRF
P-CSCF
SAE Bearer QoSSAE Bearer QoS
HUAWEI TECHNOLOGIES CO., LTD.Page 11
• VQE functions, e.g. jitter buffer, etc
• Radio optimization tech for VoIP
• Service QoS request initiation
QoS FunctionsQoS Functions
• EPS bearer setup
• PCEF functions
• VQE functions
• QoS mapping
• IP filtering, traffic shaping, etc
QoS FunctionsQoS Functions
• Radio resource allocation, packet scheduling, filtering…
• Radio optimization for VoIP
QoS FunctionsQoS Functions
• PCC QoS policy/rules control
• Retrieve user QoS profile for Policy
QoS FunctionsQoS Functions
• Enforce given policy & QoS profile
• IP transport QoS control and guarantee
QoS FunctionsQoS Functions
S/P-GW
The Role of IMS The Role of IMS –– Provide open standard QoS E2EProvide open standard QoS E2E
BOSS
Challenges of Subscriber Data Management
Network Operations
Network Operations
AS AS AS AS AS AS AS AS AS
HUAWEI TECHNOLOGIES CO., LTD.Page 12
• Mesh provision connections• Complex provisioning
procedures• Long Time-To-Market • Inconsistent data,
duplications
Complex Provisioning
• Isolated ‘silo’ data, not open• Hard to deploy new services
and facilitate service innovation
• Difficult to share with other applications
Information Silo
• Many separate Databases• Complex IMSI/MSISDN
segment management
High OPEX
MMS SMSC AS SDP HLRAAA PCRF Other DB
The Role of IMS The Role of IMS –– Create Network Based Data Reposit oryCreate Network Based Data Repository
Status
Location
ID
Terminals
Access
Insight
Personal info
User Profile ID
Unified Data Base (back end)
Diverse Application (Front End)
…HLRFE
HLRFE
HSSFE
HSSFE
AAAFE
AAAFE
LDAPFE
LDAPFE
Open to External Parties
Unified Subscriber DB - Reliable, Unified and Open U ser DB
HUAWEI TECHNOLOGIES CO., LTD.Page 13
Create a 360°user profile
User Profile
Subscription information
APP DB IDmanagement
On-lineupdateOn-lineupdate
eGUPeGUP
The Role of IMS The Role of IMS –– Enable allEnable all--round user knowledge for context based applicationsround user knowledge for context based applications
External Data Source
Versatile Application Server for All Domains
TASATS9900
TASATS9900
ShShHSS
HLR MAPMAP
Profiles
ReachabilityReachability MMTelMMTel
Service Gateway
3rd Applications
HTTP/SOAP/SMPPHTTP/SOAP/SMPPAPIsAPIs
ICT IM
CCFOCS
RfRf
RoRo
Charging
Challenges
• Need to support CS-SMS, IP- SMS and web IM
Challenges
• Too many AS, many similar services for different domains
HUAWEI TECHNOLOGIES CO., LTD.Page 14
ISCISC
S-CSCF MRFC
MrMr
CrCr
ReachabilityReachability
IPIP--SMSSMS--GWGWIP CentrexIP CentrexICS: Service ICS: Service ContinuityContinuity
MMTelMMTel
SCP IMIM--SSFSSF
Legacy IN & NGIN
mAGCF/MSS
SIPSIP
RCSRCS
SMS
E/ GdE/ Gd
Converged Messaging
The Role of IMS The Role of IMS –– Supports common AS for Mobile/Fix ed, PES/PSSSupports common AS for Mobile/Fixed, PES/PSS
Challenges
• Need to keep VAS services going for a while yet
Challenges
• Must re-create CS services & provide service continuity
CS Domain
IMS
Messaging AS
Using IMS for Seamless Messaging over LTE
CSCF
PCRF
MMTel SCC AS
Rx
S7
ISC
ISC
SMSC
C/D
E/ Gd
SGi
S4S6a
Sh
Sh/J
Cx
HSS / HLR
SMS-IW-MSC
IM
IP-SM-GW
2 Transport Level Interworking
Transport Level Interworking
3 Service Level InterworkingService Level Interworking
PS Domain
Issues
• Need to support SMS on SGs (CSFB), IP-SMS and web IM, plus interworking
HUAWEI TECHNOLOGIES CO., LTD.Page 15
GPRSEPC
Solution
• IP-SM-GW functionality is mainly responsible for IM/SMS interworking
• Fully compliant with 3GPP (TS23.204) and OMA standards UTRAN
S-GW
P-GWMME SGSN
S1-US1-MME
S7
S3S11
PC Client with Datacard / dongle
GERAN
MGW
CS Handset
S6a
1Non-IMS ScenarioNon-IMS Scenario
The Role of IMS The Role of IMS –– Supports handover and session con trol for IP Messaging & SMSSupports handover and session control for IP Messag ing & SMS
E-UTRAN
Using IMS Functions for non-Voice
Monitoring
Location Services
Gaming
Video Streaming
Session ControlQoS
per service per user
User Profiles & service profiles
HUAWEI TECHNOLOGIES CO., LTD.Page 16
On-line Purchasing
Data Sharing
MessagingMicropayments
The Role of IMS The Role of IMS –– IMS based enablers supporting nonIMS based enablers supporting non--Voice servicesVoice services
Centralised Handover
Policy & Charging Rules
Secure Authentication
HSSHSSCSCFCSCF
IMSIMSPCRFPCRF
VoLTE /IMS are Complex? – Make it Simpler
Converged Data
Converged Fix/Mobile
Converged Session
HUAWEI TECHNOLOGIES CO., LTD.Page 17
Converged Services
Converged Provisioning
Converged QoS & Policy
Converged Charging
Converged platform
Converged Management
Converged Gateways
Converged Core
Single Core
►Voice for LTE technical issues have been essential ly resolved
►IMS plays a major role for session control, QoS/Pol icy and User Data
Conclusions
HUAWEI TECHNOLOGIES CO., LTD.Page 1818
►IMS functions can support non-IMS LTE services too
►The key is to