SIP-based Presence and Messaging Services in Wireless Networks

1
SIP-based Presence and Messaging Services in
Wireless Networks

• Markus Isomäki
• Nokia

2
Outline

• Current advances in wireless terminal
  capabilities
• Specific aspects of wireless terminals
• Roadmap of SIP services in wireless terminals
• Standardization status and estimates for
  presence, messaging and chat
• IETF SIMPLE, SIPPING and SIP
• 3GPP Release 6

3
What Is Happening With Wireless Terminals During
2003

• Large colour displays
• Graphics, pictures, video, more advanced UIs
• Digital cameras
• Enable Messaging (currently MMS) Presence with
  images
• Personal/shared photo albums
• Video cameras
• Near-real time streaming
• Messaging with video clips (large size!)
• Enhanced data rates
• GPRS available in most new models
• WCDMA during 2003 with 100 kbps

4
Wireless Terminals Other Key Aspects

• Standardized/Open APIs
• Java, Symbian
• Downloadable applications
• Games etc.
• Specialization
• Different models are good for different
  applications
• Multi-terminal ownership and use
• This will set demands on protocols
• Combined use with laptops fixed PCs

5
Available Protocols and Services

• MMS
• Camera phones with GPRS taking off
• Wireless Village
• The first wave of Instant Messaging, Presence,
  Chat
• E-mail
• WAP/Web browsers
• Near real-time audio/video streaming, evolving
  toward RTSP
• Many nice downloadable applications with
  proprietary protocols
• IM Presence
• Games
• But there are still limitations
• Updating software is a major headache still in
  the future - Unlike in the PC world, the first
  software version MUST work and interoperate
• Interoperable products require good and mature
  standards!

6
Special Aspects of Wireless Terminals

• Limited bandwith
• Applications will work, but response times may
  become frustratingly long if protocols are not
  done right
• Signaling Compression (SigComp) and RTP/UDP/IP
  header compression (RoHC)can deal with protocol
  overhead
• Protocols should be designed to send only changed
  data, not always the full state
• User interface
• Displays are still relatively small, not many
  concurrent windows
• Relatively difficult to type phonebook becomes
  an essential aid
• It is necessary to integrate all aspects of the
  application into a single coherent UI using
  browser for application data configuration not
  very handy

7
SIP in Wireless Terminals

• It will be one of the main protocols in IP-based
  terminals
• Important to have open APIs for developers
• The first phase (2003-2005) will be mainly
  non-real-time services
• Presence
• Instant messaging
• Multi-party Chat
• Setting up sessions for near-real-time voice,
  video and games
• After that (2005-gt) strict real-time applications
  will follow
• Voice
• Video
• Multimedia conferencing
• Application sharing?

8
Standardization Status

• IETF
• Main source of the protocol specifications
• SIMPLE WG Presence, Instant Messaging, Data
  Manipulation
• SIPPING WG Conferencing
• SIP WG Approving the SIP extensions
• 3GPP
• Ahead of IETF in requirement setting
• Makes protocol profiles of IETF RFCs for IMS
  architecture
• Presence
• IMS Messaging Evolution
• IMS Group Management
• OMA
• IMPS WG
• Working on SIP/SIMPLE, but unclear what the scope
  of that work will be vs. IETF and 3GPP
• Interoperability between SIP/SIMPLE and Wireless
  Village

9
IETF SIMPLE/SIPPING Main Ongoing Issues 1/2

• Presence Publication
• SIP-based method selected
• New requirements coming from multi-terminal use
  cases
• For instance overriding the information published
  by another terminal
• Presence Information Document format extensions
• Media capabilities express preference/support
  for voice, video, IM etc.
• Proposal to re-use SIP Callee Capabilities exists
• Carrying multimedia content images, logos
• Presence event filtering
• Will be on SIMPLE WG charter
• Filtering will be event package specific, generic
  solution too complex
• Rules on triggering and content
• Instant Messaging sessions
• Proposals about the transport protocol have
  varied through the last year, hopefully stable now

10
IETF SIMPLE/SIPPING Main Ongoing Issues 2/2

• Presence list
• Messaging enhancements
• Requirements draft just published
• Still open whether all the features feasible with
  SIP
• Storage retrieval, conference invitations,
  group messaging, etc.
• Conference Policy Control Protocol
• Creating Conferences and setting up conference
  parameters
• Invitation list, access lists, participant rights
• This is essential already for the multi-party
  chat service
• Data manipulation
• Requirements draft exist in SIMPLE WG
• -gt Next page

11
IETF SIMPLE Data Manipulation

• Standardized protocol to configure application
  settings
• This could be done with a Web/WAP browser, but it
  would be clumsy in wireless terminals
• Management of presence and messaging lists
• CREATE list, DELETE list, ADD entry, REMOVE entry
• Management of presence authorization policies
• Logic which determines which lists/groups are
  able to see what information
• Can be a simple scripting language
• Could be fixed without possibility to change
• Management of those lists (e.g. block, allow,
  private)
• Similar to presence and messaging list management
• Must work in an environment where multiple
  clients manage the same data
• Atomicity of operations
• Notification of changes, synchronization
• ACAP and SOAP with SIP notifications proposed as
  potential solutions

12
Example Presence Scenario
13
3GPP Release 6 - Related Work Items

• Presence
• Requirements stable
• Architecture and protocol selections mainly done,
  authorization and list management not specified
  yet
• Mapping of IETF solutions to IMS Stage-3
  specifications ongoing, protocol requirements
  submitted to the IETF
• Official 3GPP Completion target 06/2003
• IMS Messaging Evolution
• Immediate, deferred delivery and session based
  messaging
• Requirements stable
• Architecture and protocol selection work done
• Immediate -gt SIP MESSAGE
• Deferred Delivery -gt MMS
• Session based -gt SIP messaging sessions
• Official 3GPP Completion target 09/2003
• IMS Group Management
• Requirements stable
• Should be harmonized with IETF data manipulation
  and conference control work
• Official 3GPP Completion target 09/2003

14
3GPP IP Multimedia Subsystem Release 6
Presence Messaging Conferencing
Data Manipulation Conference Control
Sh
APSE
HSS
Cx
ISC
Diameter
Gm
Mw
Mw
P-CSCF
S-CSCF
I-CSCF
Compression
COPS for Policy Control
WCDMA EDGE GPRS
Go
MGCF/BGCF
GGSN
GPRS Core
PSTN
Visited Domain
Home Domain
15
Conclusions

• Basic SIP specifications from the IETF and 3GPP
  Release 5 IMS are stable and ready to result in
  interoperable products
• Presence, Messaging, Chat and Session setup for
  non-real-time applications are the first uses of
  SIP in wireless terminals
• Many more standards (RFC, 3GPP TS) still needed
  to assure interoperability with all advanced
  features
• SIP PUBLISH
• Instant messaging sessions
• Data Manipulation protocol (especially important
  for wireless!)
• Conference Policy Control Protocol
• Target is to get the standards complete during
  2003 to allow mass-market deployment during 2004!