SIP for Mobile Services Arjun Roychowdhury <aroychow@hssworld.com> Hughes Software Systems

Agenda The Mobile Market 802.11 WLAN Push To Talk Some Additional Notes Conclusion

The Mobile Market Validating the Need

Who needs Mobile SIP services ? Strongest Business Case Mobile Operators Cost of deployment is low Service deployment turn-around time is much less New charging schemes easier to introduce (smile, CFOs)

Mobile Data - Revenue Growth

Mobile Data Overview

Mobile Data Overview (Source - ARC Group, www.arcgroup.com) Global MMS Traffic By Region APAC dominates Global MMS Market for next 4 years Japan, South Korea Europe witnesses MMS Boom in 2004 - 2005

Mobile Data Overview

802.11 – making the world a smaller place

WLAN - 3G Interoperability Also Note: Wi-Max makes a reality out of ‘Fixed Mobility’

Wi-Fi Enabled Cellular Handsets (Source - ON World Report on VoWLAN, Q3 2003) Dual Mode Handset Wi-Fi & Cellular Catering to an ‘All - IP Network’ Pushed forward by Market Leaders - Motorola, Nokia, Broadcom, TI Statistics Globally 650k Handsets to be Shipped by 2007 Dual Mode Handsets constitute 50% of overall revenue by 2005 Dual Mode Handsets constitute 85% of overall revenue by 2007

Voice over WLAN (VoWLAN) (Source - ON World Report on VoWLAN, Q3 2003)

Wi-Fi Enabled Cellular Handsets - Latest Industry News NTT-DoCoMo (9th Dec 2003, www.mobile9.com/category/docomo/) DoCoMo develops prototype 3G/WLAN dual-mode phones The hybrid handsets targetted at corporate clients can be used as regular 3G phones outside office high-speed access to company servers in offices equipped with WLAN WLAN service offers transmission speeds of around 11 megabits per second, which is 28 times faster than the DoCoMo’s 3G service

Wi-Fi Enabled Cellular Handsets – Latest Industry News NTT-DoCoMo (9th Dec 2003, www.mobile9.com/category/docomo/) DoCoMo aims to launch the commercial version of the hybrid handsets in the next business year starting in April in an effort to boost its 3G user base DoCoMo's 3G users totalled 1.3 million as of the end of October, lagging behind rival KDDI Corp's 10.7 million

A Carrier’s perspective -why integrate:

Push – To - Talk Here comes the Tide !

P2T - The not yet hindsight killer-app Push To Talk (aka ‘Instant Voice Messaging’ aka ‘PoC’) Service Providers in the Game Nextel, Verizon, AT&T, etc. OEMS in the scramble Motorola, Qualcomm, Nokia, Ericsson, etc Service Definition is simple – push and talk – walkie talkie mode Service realization with SIP is the issue

PoC sample call flow – many questions Is this a conference controller Model ? Is the latency acceptable for PoC especially in a wireless Network ? What happens to the call For burst talks ? Keep a call Active all the time ? If so, How does it affect billing ?

Its not just about ‘mimicking’ P2T using a regular Call Billing and Resource Allocation Implications Src: Nokia

Where is P2T going ? The Good At least everyone ‘wants’ to use ‘SIP’. P2T over IP is the industry trend OMA is trying to define approaches The Bad No standard. ‘Session-less’ P2T does not fit into a SIP session model. ‘Session’ P2T is more like a regular call OMA not yet mainstream The Ugly Everyone doing their own rendition of SIP++ The P2T world if full of patents, IPRs and like

Who is working on these issues ? 3GPP/2 OMA Independent Vendors (due to a lack of standardization) IETF SIP/SIPPING WG – not really, but should

Some Additional Notes

SIP and its competition – for mobile Space Session control / Legacy voice services (NO Risk) H.323 was never in. 3GPP selected SIP and sealed H.323’s fate for the wireless market Instant Messaging/Presence (High Risk) XMPP/JABBER/SIMPLE – battle rages on SMS/EMS/MMS – already deployed Proprietary formats abound and deployed Wireless Village OEM acceptance/SP assurance (getting better by the month) Motorola, Nokia, Ericsson, Microsoft & others heavy on the SIP bandwagon – Service Providers encouraged to rollout services (if there are no SIP phones, whats the use of SIP serivices dilemna)

Architectural requirements Server Side Provides a combination of Centralized and Peer-Peer models for service realization Integration with Web servers (via SIP servlets, SIP CGI etc) enable new ASP based service models Client Side Low footprint implementations ideal for Thin Client technology

SIP and Thin Clients.. Salient Features of SIP critical for succeeding in strict boundaries of hand held devices: Simple protocol translates to simpler processing requirements A typical UE side SIP Stack can be made to be less than 50k Affinity to HTTP style makes it a natural for Web Based services Distributed service architecture allows for complete isolation of service request (on UE) and execution (on IMS nodes) j2ME is gaining lot of acceptance- when mature, backend services based on JAIN-SIP/JSLEE and SIP servelets will be key enablers of services Symbian (EU), BREW (US) to watch for. Also Smartphone SDK Presence SIMPLE/extensions

Conclusion SIP is the natural way for wireless services adopted by 3GPP existing 2/2.5G networks looking at SIP-enabling MSCs Unified presence architecture in place SIP is lightweight to provide locally hosted services in handsets Wide adoption of SIP across Wireline and Wireless networks

Thankyou Arjun Roychowdhury <aroychow@hssworld.com> Hughes Software Systems