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3GPP MMTel General Overview
 

3GPP MMTel General Overview

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Original URL of the presentation: http://conningtech.files.wordpress.com/2010/09/3gpp-mmtel-general-overview.pdf

Original URL of the presentation: http://conningtech.files.wordpress.com/2010/09/3gpp-mmtel-general-overview.pdf

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    3GPP MMTel General Overview 3GPP MMTel General Overview Presentation Transcript

    • 3GPP Multi-media Telephony (MMTel) Overview James Ni 01/28/2010 1
    • MMTel Highlights MMTel – Multi-Media Telephony • A misleading notation • No longer the traditional telephony concept …. • …. but a whole new set of multi-media services delivered to anywhere over any networks on any devices by any medias 2
    • MMTel HighlightsMMTel redefines the way people communicate with each other• From traditional “speech speech” to “multi-media multi-media” • Flexible selection of media • Flexible add / drop media • Add / Drop participants • Start with contact list • See who is available • Select which service/media to use • Add another media• From traditional “presence-not-known” to “presence-enabled” • Add another session • Who is available • For which service • For which media • active phonebook 3
    • MMTel Highlights MMTel is a “duplicator” of internet Instant Message (IM) services (e.g. Skype) • Chat: text message delivery • Speech conversation • Video communications • File (pictures, video clips, data files etc.) transfer • Point to point and point to multi-point communications • Dynamic session add-on and removal • Presence-enabled address book • Terminal capability adaptation But MMTel is much more flexible and reliable than Instant Message (IM) • Mobility support -- Anywhere availability -- Service continuity and consistency • Fix mobile convergence support -- Terminating Access Domain Selection • Telco-grade service quality, high availability and interoperability 4
    • MMTel Service Description Multimedia conversational communications between two or more users • Real time bidirectional conversational transfer of speech, video or optionally other types of data • Point to point communications between terminals or a terminal and a network entity Symmetrical or asymmetrical communications • Media components present in each direction may be different, or • they may be the same but with different bit rates and Quality of Service • Can be started with only one type of media and additional types of media may or may not be added by the users as the communication progress. • Medias can be removed on request • Communication persists as long as there is at least on connected media Support supplementary services • The behaviour of these services is almost identical to supplementary services for CS voice (TS 11) and PSTN/ISDN. • When a supplementary service is invoked it applies to all media components • A supplementary service can be activated by the user for one or more types of media components. • If one or more of these media components are present, the supplementary service is invoked. Universal availability & accessibility • Users are provided with the services regardless of operator and access technology. 5
    • MMTel Service Description MMTel service included standardized media capabilities: • Full duplex speech; • Real time video (simplex, full duplex), synchronized with speech if present; • Chat / Text communication; • File transfer; • Video clip sharing, picture sharing, audio clip sharing. Transferred files may be displayed/replayed on receiving terminal for specified file formats • Fax; • Data ( over CS). MMTel service delivery key network elements • UE: MMTel service participant • MMTel AS: provide supports to all MMTel services – It is an implementation decision on how to distribute and locate various functionalities 6
    • MMTel Service Descriptions MMTel Specified Supplementary Services • Originating Identification Presentation (OIP) • Originating Identification Restriction (OIR) • Terminating Identification Presentation (TIP) • Terminating Identification Restriction (TIR) • Communication Diversion (CDIV) • Communication Hold (HOLD) • Communication Barring (CB) • Message Waiting Indication (MWI) • Conference (CONF) • Explicit Communication Transfer (ECT) • XCAP over Ut interface for Manipulating NGN Services • Advice Of Charge (AOC) • Closed User Groups (CUG) • Three-Party (3PTY) • Flexible Alerting (FA) • Communication Waiting (CW) • Completion of Communications to Busy Subscriber (CCBS) • Completion of Communications by No Reply (CCNR) • Customized Alerting Tones (CAT) • Customized Ringing Signal (CRS) 7
    • MMTel Service DescriptionThe Role of Presence Current “Guess-and-ring” Future Presence-based • high probability of failure: • facilitates unscheduled – Recipient status not known communications – inappropriate time (call during • provide recipient-specific information meeting) • only contact in real-time if destination – inappropriate media (audio in public is willing and able place) • appropriately use synchronous vs. • current solutions: asynchronous communication – voice mail tedious, doesn’t scale, hard to search and catalogue, no • guide media use (text vs. audio) indication of when call might be • predict availability in the near future returned (timed presence) – automated call back rarely used, too inflexible Great! Ken and Jeff are both there… I hope this time she is there to answer the call … 8
    • MMTel Service DescriptionThe Level of Presence Basic Presence Rich Presence • Requirements • More information – Availability check: • automatically derived from + can I set up communications and – sensors: physical presence, expect a response now? movement – Appropriateness check: – electronic activity: calendars + is my call going to interrupt a meeting? • Rich information: – Capability check: + should I use voice, video or IM? – multiple contacts per presence device (cell, PDA, phone etc.) • Current examples (Yahoo, MSN, Skype) service (audio, video, text etc.) – on-line & off-line – activities, current and planned + useful in modem days – but many people are technically on-line 24x7, + – surroundings (noise, privacy, vehicle, need to provide more context …) – simple status – contact information + not at my desk – composing (typing, recording + entered manually audio/video IM, …) + does not provide enough context for – And more …. directing interactive communications 9
    • MMTel Service Description The Purposes of Presence • Provide viewers with better information about the what, where, how the presences are • facilitate appropriate communications on need: – “wait until end of meeting” – “use text messaging instead of phone call” • designed to be derivable from calendar information – Plans in calendar reflected in presence information • Can be provided by sensors in the environment – Future extension • allow filtering by circles – Different privacy and presentation level • Etc….. 10
    • MMTel Service Description Presence Capabilities • Service Capabilities – Audio, application data, control, video, text, message etc. – Duplex, simplex – Priority – Language • Device Capabilities – Mobility – Priority 11
    • MMTel Service Description Presence for call routing • uses presence information to select suitable contacts – advisory only, caller may not adhere to suggestions • uses call routing policy informed by presence – likely less flexible – machine intelligence – route to appropriate destination, media capability, or indicatior. – try most-recently-active contact first if presence is not clear Presence and privacy • All presence data, particularly location, is highly sensitive • Presence information – Encrypted binary distribution – Retention duration applied • Policy rules for access control – who can subscribe to my presence – who can see what when 12
    • MMTel Service Descriptions Services based on presence • Location-based services – Finding services based on location physical services (stores, restaurants, ATMs, …) electronic services (media I/O, printer, display, …) – Using location to improve (network) services + incoming communications changes based on where I am + devices in room adapt to their current users + others are (selectively) made aware of my location + proximity grants temporary access to local resources • Presence for spam prevention – VoIP spam (“spit”) and IM spam (“spim”) likely to be more annoying than email spam – Subscription to another person is indication of mutual trust – Use watcher list (who is watching me) as trust vector 13
    • MMTel Service Description Typical presence information <person> <tuple> <device> <activities> <class> <mood> <place-is> <place-type> <privacy> <relationship> <service-class> <sphere> <status-icon> <time-offset> <user-input> 14
    • MMTel Service Delivery MMTel service delivery includes two major parts • Presence and active phonebook delivery – Presence information collection – Presence propagation – Presence information presentation • Communication service delivery – Session services + Chat / instant message + Voice call / conference + Video call / conference + Large file transfer (data, picture, video clip etc.) – Page services + SMS + Small file transfer 15
    • MMTel Service DeliveryPresence and Active phonebook • Protocol: SIMPLE (Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions) – SIP SUBSCRIBE and NOTIFY extension (RFC 3265) – Presence Information Data Format (PIDF) & Rich Presence Information Data (RPID): XML documents (RFC 3859, RFC 3863,RFC 4479, RFC 4480, RFC448, RFC 4482) – Privacy, policy and provisioning: centralized model + authentication policy (RFC 4745,RFC 5025) + presence status exchange protocol (XCAP over HTTP) RFC 4825 + subscription event "watcher info“ (RFC 3857, RFC 3858) • Competitor: XMPP (eXtensible Messaging and Presence Protocol) – XML-based protocol over HTTP – near-real-time, extensible instant messaging (IM) and presence information – message-oriented middleware – RFC3920, RFC3921, RFC3922, RFC3923 Publish Presence Server Subscribe & Notify Watcher Presence User Agent (PUA) 16
    • MMTel Service Delivery Presence propagation example (SIMPLE) Subscriber login/register PUBLISH raw Create view presence privacy (compose) document filtering composition privacy policy policypresence sources candidate filtered Presence presence watcher presence post-processing distribution document filter document composition Diff. with prev. version watcher policy Final presence NOTIFY document SUBSCRIBE 17 watchers
    • MMTel Servie Delivery Presence Servers • Watcher AS • Presence Agent (PA) AS • Presence User Agent (PUA) AS • Resource List Server (RLS) AS Watcher AS PA AS PUA AS RLS AS ISC ISC ISC ISC Access HSS Network P-CSCF S-CSCF SLF 18
    • MMTel Servcie Delivery Presence watcher subscription 19
    • MMTel Service Delivery Presence Publication Visited Net Originating Home Net MS2 P-CSCF2 S-CSCF2 PA PUBLISH PUBLISH IFC evaluation PUBLISH 200 OK 200 OK 200 OK 20
    • MMTel Service Deliver Communication Services • Communication services is the main body of MMTel Services • Communication services can be – Session based services: need to setup sessions to deliver services, e.g. call. – Page based services: do not need to setup sessions, e.g. SMS • Session based services – Single session, dynamic multi-media, asymmetrical communications – Start with single media session, e.g. text chat, add on more medias such as voice, video, file transfer etc. – Drop media without dropping sessions, e.g. drop the video media while maintaining the voice or text chat media. – Media capability can be different on the two sides of a session, e.g. one side has voice and video, the other side has only voice etc. – Dynamically add on and drop off participants (e.g. conferencing) – Message Session Relay Protocol (MSRP) for chat text service + runs over TCP, SCTP or TLS/TCP etc. + runs over media plane • Page based services – One time delivery service, e.g. SMS – Can be used to deliver small data files 21
    • MMTel Service Delivery Text Chat Session: end to end MSRP session 22
    • MMTel Service Delivery Text Chat Session: Chat Server (multi-party conferencing) 23
    • MMTel Service Delivery Session service example – add video to existing voice call 24
    • MMTel Service Charging Offline Charging Architecture Bi Billing Domain CGF Rf CDF MMTel AS Ga Online Charging Architecture Billing Domain Billing Domain OCS MMTel-AS OCS Ro 25
    • MMTel Service Charging MMTel charging scenarios MMTel charging principles Supplementary Offline Online services Charging Charging • Based in charging information OIP X - • calling user identification OIR X - • called user identification TIP X - • media component characteristics TIR X - • usage (speech, speech with other CW X - component, add/retrieve HOLD X - components..) CB X - • supplementary services applied MWI X - • apply different flexible charging based CONF X X on supplementary service type and CCBS X - options CCNR X - CDIV X X CDIVN X X ECT X X FA X X MCID X - CAT X - CUG X X 26
    • References 3GPP TS 22.173 V10.0.0 (2009-09) IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1 (Release 10) 3GPP TS 24.173 V9.0.0 (2009-12) IMS multimedia telephony communication service and supplementary services; Stage 3(Release 9) 3GPP TS 32.275 V9.2.0 (2009-12) Multi Media Telephony (MMTel) charging (Release 9) 3GPP TS 26.114 V9.1.0 (2009-12) IP Multimedia Subsystem (IMS) Multimedia Telephony;Media handling and interaction (Release 9) 3GPP TS 23.292 V9.3.0 (2009-09) IP Multimedia Subsystem (IMS) centralized services Stage 2 3GPP TS 24.292 V9.1.0 (2009-09) Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS) Stage 3 3GPP TS 23.216 V9.1.0 (2009-09) Single Radio Voice Call Continuity (SRVCC) Stage 2 3GPP TS 23.237 V9.2.0 (2009-09) IP Multimedia Subsystem (IMS) Service Continuity Stage 2 3GPP TS 24.237 V9.0.0 (2009-09) IP Multimedia Subsystem (IMS) Service Continuity Stage 3 27