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An Open Service Architecture with Location Aware Calls and Services

This talk discusses the trends, definitions, and technical solutions related to mobility in telecommunication networks. It focuses on the integration of telephony and location-based services using the UMTS IMS system and Parlay/UMTS OSA API. The talk also explores the concept of a virtual home environment and the potential role of "middleman" arrangements to decentralize operator-centric views. The scope is based on ETSI/3GPP definitions and considers the control over non-functional requirements by operators.

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An Open Service Architecture with Location Aware Calls and Services

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  1. An Open Service Architecture withLocation Aware Calls and Services Lill Kristiansen, Prof. Dr. Scient Dept. of Telematics, NTNU, Norway www.item.ntnu.no/~lillk www.pats.no (lab-information) lill_kristiansen@hotmail.com

  2. Outline of the talk • Trends in evolution • Layering, separation and towards ’all-IP’ • Some mobility definitions • User mobility, service mobility, terminal mobility,… • Virtual home environment • Brief overview of UMTS IMS system (release 5,..) • Brief overview of Parlay / UMTS OSA • API for ’value added services’ • A framework to discuss technical solutions to mobility • Illustrations of GSM/Camel and IMS/OSA in this framework • Illustrations of possible ’middleman’ arrangements using OSA, to decrease the ’operator centric view’

  3. The scope of this talk: • We are mostly based on the current and upcoming ETSI/3GPP definitions (GSM, IMS and OSA) • We look into combinations of ’telephony’ and location based services • We consider that each operator: • Has some hardware and software controlled by himself • Hence has control over the non-functional requirements in this way • We do not consider ’mobile code’ in general • But we may foresee upgrades of software from vendor to operator, or from operator’s management system to operator’s switches (call servers and service nodes

  4. Evolution: • Several activities going on • From CS (Circuit switched) to PS (Packet switched) • From monolitic systems (GSM and PSTN) to layered systems with one common core systemwith several access technologies • QoS and realtime aspects • GSM (2G CS):supports ’voice ’interactive conversation with 1 medium) • UMTS (3G first releases): • CS multimedia (H.324M) supports multimedia telephony

  5. System topology • Today • Separate Networks • Separate Users • Separate Services • Tomorrow • Separate Accesses • Same Core network • Same User on different accesses • Same Services Separate Services PLMN Data/IP Networks PSTN/ISDN CATV Separate users

  6. UMTS from release 5 on: IMS: IP Multimedia Subsystem • Same Core network • Same User on different accesses • Same Services • I can use WLAN, ADSL, LAN, UTRAN (GPRS) etc. as accesses in ONE system • I can have several devices and move between them Servers Content Content Communication Control Access Gateways Access Gateways Backbone Network Access Access Access Users

  7. General types of mobility • Mobility between several technologies (e.g. with the same handheld device having several (radio) access modes). • User mobility across different devices. • Mobility in a network (i.e. inside one technology). • Terminal mobility in GSM network • Either inside one operator domain (/one country) • Or ‘roaming’ (to a foreign contry/operator domain)

  8. General mobility definitions • Personal mobility enables users to use services that are personalized with their preferences and identity ubiquitously, independently of both physical location and specific equipment. … (From TINA-C in the mid-90’ties) • Service mobility (of a particular service) is defined as the ability for a user to obtain that particular service independently of user and terminal mobility.(Ericsson contribution to ETSI Tiphon 1999) • Virtual Home Environment (VHE) is defined as a concept for Personal Service Environment (PSE) portability across network boundaries and between terminals. The concept of VHE is such that users are consistently presented with the same personalized …. (3GPP TS 23.127)

  9. 2G GSM 3G first releasesUTRAN 2,5G ERAN Evolution (modified from Kanter) WAPe.g. email MMoIP(1) e.g. MMS MMoIP(2) e.g. steaming (and H.324M) Mobile 3+G from rel.5 UTRAN MMoIP(3) IMS/’telephony’ Internet ”4-G” WLAN MMoIP(4) e.g. P2T

  10. QoS and realtime aspects • The CS part: • GSM (2G CS):supports ’voice telephony’i.e.: ’interactive conversation with one medium’ • UMTS (3G first releases CS): (H.324M) supports ’multimedia telephonyi.e. ’ ’interactive conversation with multi media’ • The ’data’ part: • GSM supports CS-data: not used for ’conversation’ (too much delay) • GSM/GPRS (2G, 2,5G) supports SMS, and MMS: MMoIP(1): QoS BE: Best Effort (not requiring real time support) • GPRS with streaming MMoIP(2) • From realease 5: All-IP common voice/data • Full QoS enabling MMoIP(3) (VoIP and MMoIP in)IMS: Interactive Conversational Services over IP, using SIP • Via WLAN: P2T/PoC (Push to Talk /over Cellular) varying QoS(delays and walkie-talkie-like)

  11. UMTS IMS architecture HSS: Home Subscriber Services HLR-like CSCF: ’Call Server’ Call/Session Control Function P-CSCF Proxy- I-CSCF Interrogating- S-CSCF Serving- xGSN GPRS-noder Home B Home A HSS HSS S-CSCF S-CSCF I-CSCF I-CSCF Visited B Visited A P-CSCF P-CSCF GGSN GGSN SGSN SGSN Radio Access Network Radio Access Network B A

  12. Home A Home B HSS HSS S-CSCF S-CSCF I-CSCF I-CSCF Visited B Visited A P-SCSF P-CSCF GGSN SGSN WLAN Radio Access Network B A UMTS IMS: basic call flow Non-GPRS access Networks (e.g. WLAN)comes in release 6

  13. Virtual Home Environment (3GPP): • VHE enables end users to bring with them their personal service environment whilst roaming between networks, and also being independent of terminal used • PSE Personal Service Environment: • describes how the user wishes to manage and interact with her communication services. It is a combination of a list of subscribed to services, service preferences and terminal interface preferences. PSE also encompasses the user management of multiple subscriptions, e.g. business and private, multiple terminal types and location preferences. • The PSE is defined in terms of one or more User Profiles.

  14. 3GPP OSA architecture • Allows application to use underlying network resources • Allows combinations: • Location capabilities (from GSM/UMTS and WLAN) • Radionor Cordis Radioeye allows detailed location in WLAN • SMS/MMS capabilities • Call Control capabilities

  15. Parlay and UMTS Open Service Access;Migration and Convergence

  16. Parlay/OSA for data-services Today (2000 and 2004) on PC: type in your location into web-pagemanuallyTomorrow:fixed LAN,and WLAN access into same core system

  17. Bank services Location services Leisure News For data services (From Ericsson 2000)Avoid typing, get location automatic e.g. into WAP page (or into SMS content) Today in Oslo, Norway(2004): Call taxi, application fetches your location:nearest taxi comes (combinations: call, location, applic.data!)Further issues:mobility between operators, countries and companies for this taxi service

  18. A Framework to analyse the relations between home and visited in 2G and 3G • This figure assumes no mobile code • i.e. more specifically: • Each box is: hardware, software run by one operator • (We may note that mobility in both 2G and planned versions of 3G all assumes no mobile code.)

  19. S2) AS2 OSA WAPGW WAP IN/Camel S) SCS HLR HLR MSC+VLR C) CC MSC CC Framework applied to 2G with OSA • NOTE: There is a typo in the paper, this is the right version of Figure 3, showing Camel

  20. 3G IMS system in this reference model • This is previous IMS-slide, now slightly re-arranged

  21. OSA revisited:with several service providers involved This may be the (national) regulator

  22. Advantages with this new solution • Less ’operator centric’ • Does not require the 3rd party service provider to have a business relation with the operator • The regulator acts as ’neutral middleman’: • assuring equal access for all service providers • Single point of contact for the enduser • Easier for the enduser to enforce a good privacy policy

  23. Network centric =/= operator centric • AS3 is a network based solution, but totally independent from the network operator domain • A personal web-page might also act as a network based solution • See Jan Egil Kristiansen Our addresses and phones, http://heima.olivant.fo/~styrheim/kontakt.en.html • The enduser himself controls the user mobility, and (in non-realtime) informs his contacts about the ’current terminal/SIM card) • Allows the enduser to buy local GSM-cards, instead of the often more expence network operator centric solution with ’roaming’ That is often very expensive, and subject to little competition

  24. Summing up the reference figure • Allows us to discuss different business models between home and visited networks • Fits in with 2G & Camel &OSA • Shows some major drawback with Camel • Due to call server (MSC in visited network) • Also fits in with 3+G (IMS) & OSA • Nice to use when discussing the advantages of having S-CSCF in home network vs. (the now gone option of S-SCSF in visited network) • Useful when discussing the fully mobile case of ’call nearest taxi’ • Fits in also with private initiatives not described in the 3GPP standards • Further issues: Mobile code is not covered

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