Status of Implementation of IMSIMT The UTL Perspective
- Slides: 25
Status of Implementation of IMS/IMT The UTL Perspective ITU Conference-Study Group 13 Kampala – Uganda 2 -4 April 2012
Presenters Richard Adongu Core Network Planning Engineer Ocira Oyaro Radio Network Planning Engineer Uganda Telecom MIT, B Sc. (Phy/Math), PGD C. SC. (MUK) CDM (CMI, UK) E-mail: richard. adongu@utl. co. ug B Sc. Phy/Math (MUK) Certifications: Radio Access Technologies E-mail: david. ocira@utl. co. ug
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.
Outline Ø IMS – The Concept /Overview Ø UTL - Existing Network Ø Why the Move to IMS? Ø The Challenges Ø IMT
IMS : Overview IP Multimedia Subsystem (IMS) Conceptually analogues to Biblical(John 14: " My Father’s House, has many rooms. . ”)- all can be accommodated, is; ØMost Unifying/Seamless technology or platform: - wire line, cable, internet, wireless all together ØA requirement for transiting to a fully converged, open and distributed architecture ØFrom high demand for integration for delivery of IP multimedia services using integrated devices (smartphones, etc. )
IMS - Layers and Protocols ØProtocols: All NGN (SIP, H 323, H 248, MGCP, SIGTRAN), Diameter, Legacy-SS 7, R 2, V 5. 2. ØLayers: Three (3) - Application, Control and User Ø 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 Ø 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 Ø User/Access: Provides access from User Equipment (UE) over mobile, Wi. Fi 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.
IMS - Core Architecture/Layers
IMS - Core Functions Ø Runs all NGN Core functions ØCall control ØMedia Gateway Access Control ØResource Allocation ØProtocol Processing ØRouting ØAuthentication ØCharging ØApplication Programming Interfaces (API) ØWeb based and presence services
IMS - Services ØAll NGN and Legacy Services ØVoice - Basic, Supplementary (Wake up, Call waiting, CLI), Øx. DSL, ISDN ØIP Fax ØIP Centrex, ØIVR ØMultimedia Services: - Video, instant messaging, program sharing, electronic white board, video conferencing/streaming ØIN Services: - card calling, advanced prepaid calling, VPN, Number Portability, ØUnified/Smart Services: - unified messaging, colour dial tone, instant messaging. ØBusiness Services - SIP Trunking, SIP Centrex ØResidential Services- Voice and video telephony ØIP Voice and IP Video mail ØVoice and Video conferencing
UTL – Current Network Status Ø PSTN/TDM/Legacy Voice and Data Nodes Ø TDM switches, Leased line data nodes, ADSL DSLAMs, ADMs, SGSN/GGSN, Ø NGN Nodes Ø NGN structure is four layered: - Application, Network Control, Core Switching, Edge Access Ø Nodes: Soft Switches (Soft 3000 & MSoft 3000), MSANs, Media Gateways, IADs, Media Gateway Controllers, Application Servers, IN, Media Resource Servers, Signalling Gateways, SHLR/VLR.
Architecture of UTL Existing Network
UTL- Current Services Offered Ø POTs, ISDN, x. DSL, V. 5. 2, leased line Ø GSM, GRPS, 3 G, Wi. MAX Ø Hosted PBX Ø IP Centrex Ø Tele-conference calling Ø Video Conferencing Ø VPNs Ø Soft phone Services Ø Unified Messaging Platforms Ø Colorful Ring-back Tone Ø Alarm Call Ø Sequential Ring Ø Number Portability Ø 3 rd Party Customized Services All these will be offered by IMS
Why the Move to IMS? Drivers include the need to: - Ø Move from Legacy TDM and NGN to integrate networks/services – Service integration Ø Meet customer unified service expectations Ø Innovate new applications/service offeringsmultimedia services/unified communication Ø Reduce CAPEX & OPEX-one network, many services Ø Follow fast paced technological trends
UTL - IMS Network Structure
UTL IMS – The Transition Model Ø Vendors and operators are at an IMS war : Each, is saying; the Other is not ready; Ø Despite absence of 100% Universal IMS standard, the transition: Ø Has to be gradual/evolutionary: moving from TDM to NGN to IMS Ø Must accommodate legacy networks/services Ø Must start with the core replacement; integrating IMS components into NGN
UTL IMS Transition Roadmap - Structure Before 2005 From 2005 Since 2006 From 2013 From 2015
The Move to IMS – Challenges Ø Legacy network / services - need replacement/accommodation Ø High Investment Capital- Financiers have to come in Ø Limited knowledge about IMS – Roadmap not yet clear Ø Low levels of skills – training in new technologies: support from developers, vendors, regulators, others is key Ø Fast technology changes-Operators unable to churn networks at a matching rate Ø Market not yet ready-only a small portion of the market may be ready for the changes Ø Initial costs of integrated terminals is normally high
IMT Objectives l Anywhere, Anytime Wireless(Terminal mobility) Global Roaming Personal Mobility, Service Portability Virtual Home Environments(VHE) l Whatever Multimedia Services �(Speech + Internet) Services
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);
IMT-Characteristics (cont. ) • Support both packet-switched (PS) and circuitswitched (CS) data transmission; • Offer high data rates up to 2 Mbps, Ø 144 kbps for high mobility, Ø 384 kbps with restricted mobility and, Ø 2 Mbps in an indoor office environment; • Offer high spectrum efficiency;
IMT-Family Members • For the terrestrial mobile network, there are six family members identified as being IMT-2000 compatible: Ø IMT Direct Spread (IMT-DS; also known as UMTS/UTRA-FDD); Ø IMT Time Code (IMT-TC; also known as UMTS/UTRA-TDD. Ø IMT Multicarrier (IMT-MC; also known as CDMA 2000); Ø IMT Single Carrier (IMT-SC; also known as EDGE); Ø IMT OFDMA TDD WMAN (also known as mobile Wi. MAX)
IMT-Indoor Coverage Solution • Repeaters • Dual Mode Wi. Fi • Femtocells
Concept of Femtocell • Indoor cellular coverage • Can “talk” with any device • Low cost backhauling
Features of Femtocell • Operates in the licensed spectrum • Uses fixed broadband connection for backhaul • Lower cost • Smaller coverage • Smaller number of subscriber • Higher density
The clock will not turn back = Thank You =
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