ITU Conference-Study Group 13 Kampala – Uganda 2-4 April 2012

1. Status of Implementation of IMS/IMT The UTL Perspective ITU Conference-Study Group 13 Kampala – Uganda 2-4 April 2012

2. Presenters Richard Adongu Core Network Planning Engineer Uganda \Telecom MIT, B Sc. (Phy/Math), PGD C. SC. (MUK) CDM (CMI, UK) E-mail: richard.adongu@utl.co.ug Ocira Oyaro Radio Network Planning Engineer Uganda \Telecom B Sc. Phy/Math (MUK) Certifications: Radio Access Technologies E-mail: david.ocira@utl.co.ug

3. Abstract The global world is moving to convergence in all fields; economy, political and social life, education, technology, etc. The field of ICT in particular, is developing at a much faster rate and convergence is becoming the defining term for fixed and mobile networks. This paper gives a brief outline of IMS/IMT technologies which are central in achieving FMC. It uses Uganda Telecom networks as a case study to define the road map for achieving IMS/IMT. Different operators may have different scenarios, that may necessitate following a different road map, however the ultimate aim or end result is to achieve FMC.

4. Outline • IMS – The Concept /Overview • UTL - Existing Network • Why the Move to IMS? • The Challenges • IMT

5. IMS : Overview IP Multimedia Subsystem (IMS) Conceptually analogues to Biblical(John 14:" My Father’s House, has many rooms..”)- all can be accommodated, is;- • Most Unifying/Seamless technology or platform:- wire line, cable, internet, wireless all together • A requirement for transiting to a fully converged, open and distributed architecture • From high demand for integration for delivery of IP multimedia services using integrated devices (smartphones, etc.)

6. IMS - Layers and Protocols • Protocols: All NGN (SIP, H323, H248, MGCP, SIGTRAN), Diameter, Legacy-SS7, R2, V5.2. • Layers: Three (3) - Application, Control and User • Application: Provision and Management of Services, defines interfaces to common functions - configuration storage, identity management, user status e.g. presence, location held by Home Subscriber Server (HSS); billing services by a Charging Gateway Function (CGF), control of voice/video calls, messaging • Control: Routes signaling, enables transport plane to traffic filter, generates billing information, Call Session Control Function (CSCF) with functions like: security, resource allocation, queries, call processing, authentication, etc. are performed and other servers • User/Access: Provides access from User Equipment (UE) over mobile,WiFi and broadband networks. Access into core is via Border Gateways (GGSN/PDG/BAS) that enforce IMS Core policies, controlling traffic flows between the access and core networks.

7. IMS - Core Architecture/Layers

8. IMS - Core Functions • Runs all NGN Core functions • Call control • Media Gateway Access Control • Resource Allocation • Protocol Processing • Routing • Authentication • Charging • Application Programming Interfaces (API) • Web based and presence services

9. IMS - Services • All NGN and Legacy Services • Voice - Basic, Supplementary (Wake up, Call waiting, CLI), • xDSL, ISDN • IP Fax • IP Centrex, • IVR • Multimedia Services:- Video, instant messaging, program sharing, electronic white board, video conferencing/streaming • IN Services:- card calling, advanced prepaid calling, VPN, Number Portability, • Unified/Smart Services:- unified messaging, colour dial tone, instant messaging. • Business Services - SIP Trunking, SIP Centrex • Residential Services- Voice and video telephony • IP Voice and IP Video mail • Voice and Video conferencing

10. UTL – Current Network Status • PSTN/TDM/Legacy Voice and Data Nodes • TDM switches, Leased line data nodes, ADSL DSLAMs, ADMs, SGSN/GGSN, • NGN Nodes • NGN structure is four layered:- Application, Network Control, Core Switching, Edge Access • Nodes: Soft Switches (Soft3000 & MSoft3000), MSANs, Media Gateways, IADs, Media Gateway Controllers, Application Servers, IN, Media Resource Servers, Signalling Gateways, SHLR/VLR.

11. Architecture of UTL Existing Network

12. UTL- Current Services Offered • POTs, ISDN, xDSL, V.5.2, leased line • GSM, GRPS, 3G, WiMAX • Hosted PBX • IP Centrex • Tele-conference calling • Video Conferencing • VPNs • Soft phone Services • Unified Messaging Platforms • Colorful Ring-back Tone • Alarm Call • Sequential Ring • Number Portability • 3rd Party Customized Services All these will be offered by IMS

13. Why the Move to IMS? • Drivers include the need to:- • Move from Legacy TDM and NGN to integrate networks/services – Service integration • Meet customer unified service expectations • Innovate new applications/service offerings-multimedia services/unified communication • Reduce CAPEX & OPEX-one network, many services • Follow fast paced technological trends

14. UTL - IMS Network Structure

15. UTL IMS – The Transition Model • Vendors and operators are at an IMS war : Each, is saying; the Other is not ready; • Despite absence of 100% Universal IMS standard, the transition:- • Has to be gradual/evolutionary: moving from TDM to NGN to IMS • Must accommodate legacy networks/services • Must start with the core replacement;- integrating IMS components into NGN

16. UTL IMS Transition Roadmap - Structure Before 2005 From 2005 Since 2006 From 2013 From 2015

17. The Move to IMS – Challenges • Legacy network / services - need replacement/accommodation • High Investment Capital- Financiers have to come in • Limited knowledge about IMS – Roadmap not yet clear • Low levels of skills – training in new technologies: support from developers, vendors, regulators, others is key • Fast technology changes-Operators unable to churn networks at a matching rate • Market not yet ready-only a small portion of the market may be ready for the changes • Initial costs of integrated terminals is normally high

18. IMT Objectives • Anywhere, Anytime •  Wireless(Terminal mobility)  Global Roaming  Personal Mobility, Service Portability Virtual Home Environments(VHE) • Whatever  Multimedia Services •  (Speech + Internet) Services

19. IMT-Characteristics • Worldwide usage,integration of satellite and terrestrial systems to provide global coverage; • Used for all radio environments,(LAN, cellular, satellite); • Wide range of telecommunications services,(voice, data, multimedia, internet);

20. IMT-Characteristics (cont.) • Support both packet-switched (PS) and circuit-switched (CS) data transmission; • Offer high data rates up to 2 Mbps, • 144 kbps for high mobility, • 384 kbps with restricted mobility and, • 2 Mbps in an indoor office environment; • Offer high spectrum efficiency;

21. IMT-Family Members • For the terrestrial mobile network, there are six family members identified as being IMT-2000 compatible: • IMT Direct Spread (IMT-DS; also known as UMTS/UTRA-FDD); • IMT Time Code (IMT-TC; also known as UMTS/UTRA-TDD. • IMT Multicarrier (IMT-MC; also known as CDMA2000); • IMT Single Carrier (IMT-SC; also known as EDGE); • IMT OFDMA TDD WMAN (also known as mobile WiMAX)

22. IMT-Indoor Coverage Solution • Repeaters • Dual Mode WiFi • Femtocells

23. Concept of Femtocell • Indoor cellular coverage • Can “talk” with any device • Low cost backhauling

24. Features of Femtocell • Operates in the licensed spectrum • Uses fixed broadband connection for backhaul • Lower cost • Smaller coverage • Smaller number of subscriber • Higher density

25. The clock will not turn back • = Thank You =