EAB-05:006042 Uen Rev A ... [e-mail]

1
IMS Standardization

• Gonzalo.Camarillo_at_ericsson.com

2
IMS Standards

• IMS standardisation process
• 3GPP is responsible for the definition of the IMS
  architecture and protocols. However for
  protocols, 3GPP will reuse existing IETF
  protocols where ever possible. The diagram
  provides a high level mapping of the relationship
  between 3GPP and IETF, highlighting the
  workgroups within IETF contributing to
  standardisation of IMS.
• The relationship and compliance between 3GPP and
  IETF is greater than ever before.

IETF
Transport Area
Operations Management Area
Application Area
Security Area
Internet Area
SIP
SIPPING
DIFFSERV
ROHC
IMPP
IPSEC
SMIME
IPv6
SIMPLE
AAA
MMUSIC
MEGACO
AVT
3
IMS Phases

• IMS is standardised by 3GPP in two Releases.
• The first release is part of the 3GPP Release 5
  and is, practically speaking, targeted at
  supporting non-real time services. Release 5
  based products are expected on the market around
  2004.
• The second release is 3GPP Release 6 and is
  targeted at supporting real time services.

4
3GPP IMS architecture R5, general capabilities

• Establishing a Multimedia Session
• Audio
• Video
• Whiteboard
• Instant messaging
• Addition of new media streams during an ongoing
  session
• Different charging models
• Originating party pays everything
• Originating party pays his own resources,
  terminating party pays his own
• Shared Originating party pays for certain
  streams, terminating party for others
• IMS is the service enabler services are not
  standardized, but service capabilities are.

5
3GPP IMS architecture R5, general capabilities (2)

• The home network may restrict certain media
  streams based on type of subscription.
• The visited network may want to authorize radio
  resources.
• Multimedia conferences with the MRF (audio,
  video, wb) (although the interface between
  Application Server and MRFC is not standardized)
• Integrated terminals (CS PS(IMS).
• Users are assigned one or more telephone numbers
  and one or more SIP URLs (e.g., multiple IDs).
• Interworks with PSTN and PLMN (although the
  interworking is not standardized).
• Session transfer services call transfer, call
  diversion, etc.
• SIP signalling is compressed over the air
  interface to decrease session setup time.

6
3GPP IMS Release 6

• Presence services (awaiting for SIMPLE
  dependencies)
• Includes the Ut interface to manage presence
  lists and authorize watchers
• Session based messaging (awaiting for SIMPLE
  dependencies)
• Services requiring SIP forking
• Public Service Identifiers (PSI)
• General interworking with non-3GPP SIP
• Support for emergency sessions (moved to R7)
• IMS conferencing (awaiting for SIPPING and XCON
  dependencies)
• Includes floor control
• Includes the Ut interface to manage conferences
• Support for extended services (e.g., 3rd party
  registrations)
• WLAN support to access to the IMS
• Split of P-CSCF and Policy Decision Function
• PSTN-IMS interworking

7
IMS Specifications

• 3GPP
• http//www.3gpp.org/specs/specs.htm
• 3GPP2
• http//www.3gpp2.org/Public_html/specs

8
3GPP IMS-Related Specifications (1)

• 21.905 Vocabulary for 3GPP Specifications R5
• 22.066 Support of Mobile Number Portability
  (MNP) Stage 1 R6
• 22.101 Service aspects Service principles R5
• 22.141 Presence service Stage 1 R6
• 22.228 Service requirements for the Internet
  Protocol (IP) multimedia core network subsystem
  Stage 1 R5
• 22.250 IP Multimedia Subsystem (IMS) Group
  Management Stage 1 R6
• 22.340 IP Multimedia Subsystem (IMS) messaging
  Stage 1 R6
• 22.800 IMS Subscription and access scenarios R6
• 23.002 Network Architecture R5
• 23.003 Numbering, Addressing and Identification R5

9
3GPP IMS-Related Specifications (2)

• 23.125 Overall high level functionality and
  architecture impacts of flow based charging
  Stage 2 R6
• 23.141 Presence service Architecture and
  functional description Stage 2 R6
• 23.207 End-to-end Quality of Service (QoS)
  concept and architecture R5
• 23.218 IP Multimedia (IM) session handling IM
  call model Stage 2 R5
• 23.221 Architectural requirements R5
• 23.271 Location Services (LCS) Functional
  description Stage 2 R6
• 23.278 Customised Applications for Mobile network
  Enhanced Logic (CAMEL) IP Multimedia System
  (IMS) interworking Stage 2 R5

10
3GPP IMS-Related Specifications (3)

• 23.864 Commonality and interoperability between
  IP Multimedia System (IMS) core Networks R6
• 23.867 Internet Protocol (IP) based IP Multimedia
  Subsystem (IMS) emergency sessions R6
• 23.917 Dynamic policy control enhancements for
  end-to-end QoS, Feasibility study R6
• 23.979 3GPP enablers for Push-To-Talk over
  Cellular (PoC) services Stage 2 R6
• 23.981 Interworking aspects and migration
  scenarios for IPv4-based IP Multimedia Subystem
  (IMS) Implementations R6
• 24.141 Presence service using the IP Multimedia
  (IM) Core Network (CN) subsystem Stage 3 R6

11
3GPP IMS-Related Specifications (4)

• 24.147 Conferencing using the IP Multimedia (IM)
  Core Network (CN) subsystem
• Stage 3 R6
• 24.228 Signalling flows for the IP multimedia
  call control based on Session Initiation
• Protocol (SIP) and Session Description Protocol
  (SDP) Stage 3 R5
• 24.229 Internet Protocol (IP) multimedia call
  control protocol based on Session Initiation
  Protocol (SIP) and Session Description Protocol
  (SDP) Stage 3 R5
• 24.247 Messaging using the IP Multimedia (IM)
  Core Network (CN) subsystem Stage 3 R6
• 26.235 Packet switched conversational multimedia
  applications Default codecs R5
• 26.236 Packet switched conversational multimedia
  applications Transport protocols R5
• 29.162 Interworking between the IM CN subsystem
  and IP networks R6
• 29.163 Interworking between the IP Multimedia
  (IM) Core Network (CN) subsystem and Circuit
  Switched (CS) networks R6
• 29.207 Policy control over Go interface R5
• 29.208 End-to-end Quality of Service (QoS)
  signalling flows R5

12
3GPP IMS-Related Specifications (5)

• 29.209 Policy control over Gq interface R6
• 29.228 IP Multimedia (IM) Subsystem Cx and Dx
  Interfaces Signalling flows and message contents
  R5
• 29.229 Cx and Dx interfaces based on the Diameter
  protocol Protocol details R5
• 29.278 Customised Applications for Mobile network
  Enhanced Logic (CAMEL) CAMEL Application Part
  (CAP) specification for IP Multimedia Subsystems
  (IMS) R5
• 29.328 IP Multimedia Subsystem (IMS) Sh interface
  signalling flows and message
• Content R5
• 29.329 Sh interface based on the Diameter
  protocol R5
• 29.962 Signalling interworking between the 3GPP
  profile of the Session Initiation Protocol (SIP)
  and non-3GPP SIP usage R6

13
3GPP2 IMS-Related Specifications (1)

• 31.103 Characteristics of the IP Multimedia
  Services Identity Module (ISIM) application R5
• 32.200 Telecommunication management Charging
  management Charging principles (Only) R5.
  (Replaced by 32.240 in R6.)
• 32.225 Telecommunication management Charging
  management Charging data description for the IP
  Multimedia Subsystem (IMS) (Only) R5. Replaced by
  32.260 in R6
• 32.240 Telecommunication management Charging
  management Charging Architecture and Principles
  R6
• 32.260 Telecommunication management Charging
  management IP Multimedia Subsystem (IMS)
  charging R6
• 32.421 Telecommunication management Subscriber
  and equipment trace Trace concepts and
  requirements R6
• 33.102 3G security Security architecture R5

14
3GPP2 IMS-Related Specifications (2)

• 33.108 3G security Handover interface for Lawful
  Interception (LI) R5
• 33.141 Presence service Security R6
• 33.203 3G security Access security for IP-based
  services R5
• 33.210 3G security Network Domain Security
  (NDS) IP network layer security R5

15
IETF IMS-Related Specifications SIP (1)

• RFC 3261 Session Initiation Protocol
• RFC 3262 Reliable provisional responses in SIP
• RFC 3263 Locating SIP servers
• RFC 3265 SIP-specific event notification
• RFC 2617 HTTP Authentication Basic and Digest
  Access Authentication
• RFC 2976 The SIP INFO method
• RFC 3050 Common Gateway Interface for SIP
• RFC 3310 HTTP Digest Authentication Using
  Authentication and Key Agreement (AKA)
• RFC 3311 The SIP UPDATE method
• RFC 3312 Integration of Resource Management and
  SIP
• RFC 3313 Media Authorization in SIP

16
IETF IMS-Related Specifications SIP (2)

• RFC 3323 SIP Privacy
• RFC 3325 The SIP P-Asserted-Identity header
• RFC 3326 The SIP Reason header
• RFC 3327 The SIP Path header
• RFC 3329 Security Agreement in SIP
• RFC 3428 The SIP MESSAGE method
• RFC 3455 P-Header Extensions to the SIP for 3GPP
  and SIP
• RFC 3485 The SIP and SDP Static Dictionary for
  Signaling Compression (SigComp)
• RFC 3486 Compressing SIP
• RFC 3515 The SIP REFER method

17
IETF IMS-Related Specifications SDP

• RFC 2327 Session Description Protocol
• RFC 3108 ATM extensions for SDP
• RFC 3264 An offer/answer model with SDP
• RFC 3266 Support for IPv6 in SDP
• RFC 3388 Grouping of media lines in SDP

18
IETF IMS-Related Specifications Security

• RFC 2617 "HTTP Authentication Basic and Digest
  Access Authentication".
• RFC 2401 "Security Architecture for the Internet
  Protocol".
• RFC 2402 "IP Authentication Header".
• RFC 2406 "IP Encapsulating Security Payload
  (ESP)".
• RFC 3261 "Session Initiation Protocol (SIP)".
• RFC 3310 "HTTP Digest Authentication Using AKA".
• RFC 3329 "Security Mechanism Agreement for the
  Session Initiation Protocol (SIP)".

19
IETF IMS-Related Specifications Presence and
Instant Messaging (1)

• RFC 2778 A Model for Presence and Instant
  Messaging
• RFC 3265 SIP events (SUBSCRIBE/NOTIFY)
• RFC 3428 SIP for Instant Messaging (MESSAGE)
• I-D A Presence Event Package for the Session
  Initiation Protocol (SIP (Internet Draft)
• I-D An Extensible Markup Language (XML) Based
  Format for Watcher Information (Internet Draft)
• I-D A Watcher Information Event Template-Package
  for the Session Initiation Protocol (SIP)
  (Internet Draft)
• I-D A SIP Event Notification Extension for
  Resource Lists (Internet Draft)
• I-D SIP Extension for Presence Publication
  (PUBLISH) (Internet Draft)
• I-D Instant Message sessions in SIMPLE
• I-D RPIDS - Rich Presence Information Data
  Format for Presence Based on SIP

20
IETF IMS-Related Specifications Presence and
Instant Messaging (2)

• I-D The Extensible Markup Language (XML)
  Configuration Access Protocol (XCAP)
• I-D Extensible Markup Language (XML)
  Configuration Access Protocol (XCAP) Usages for
  setting Presence Authorization
• I-D Extensible Markup Language (XML)
  Configuration Access Protocol (XCAP) Usages for
  setting Presence Lists
• I-D A Session Initiation Protocol (SIP) Event
  Package for Modification Events for the
  Extensible Markup Language (XML) Configuration
  Access Protocol (XCAP) Managed Documents

21
IETF IMS-Related Specifications Miscellaneous

• RFC 2481 The Network Access Identifier
• RFC 3588 Diameter Base Protocol
• RFC 2916 E.164 number and DNS