1. 1 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki SIP-based Presence and Messaging Services in Wireless Networks Markus Isomäki Nokia

2. 2 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 3 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 4 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 5 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 6 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 7 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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->) strict real-time applications will follow Voice Video Multimedia conferencing Application sharing?

8. 8 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 9 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 10 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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 -> Next page

11. 11 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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. 12 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki Example Presence Scenario Private Alice Bob Allow John Peter Lucy Tom … PUA A PUA B Compositor Tuple 1A Tuple 2 Tuple 3 Tuple 4 Presence Document PUBLISH Tuple 1B Tuple 2 PUBLISH Tuple 1A Tuple 3 Tuple 4 PUA A and PUA B publish the same information (Tuple 1). PUA A wins based on explicit preference or based on compositor policy Tuple 1A Tuple 2 Tuple 3 Tuple 4 Tuple 1A Tuple 3 Watchers in different groups are given different parts and views of the overall presence information Data Manipulation manages this information

13. 13 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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 -> SIP MESSAGE Deferred Delivery -> MMS Session based -> 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. 14 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 3GPP IP Multimedia Subsystem Release 6 P- CSCF I-CSCF S- CSCF Gm Mw Cx Diameter GGSN Go COPS for Policy Control Visited Domain Home Domain Compression APSEHSS ISC Sh GPRS Core WCDMA EDGE GPRS MGCF/BGCF PSTN Presence Messaging Conferencing

15. 15 © NOKIA SIP 2003 Conference / 15-01-2003 / Markus Isomäki 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!