ITU Conference-Study Group 13Kampala – Uganda

2-4 April 2012

Status of Implementation of IMS/IMT

The UTL Perspective

Presenters

Richard AdonguCore Network Planning Engineer

Uganda \TelecomMIT, B Sc. (Phy/Math), PGD C. SC. (MUK)

CDM (CMI, UK)E-mail: richard.adongu@utl.co.ug

Ocira OyaroRadio Network Planning Engineer

Uganda \TelecomB Sc. Phy/Math (MUK)

Certifications: Radio Access TechnologiesE-mail: david.ocira@utl.co.ug

AbstractThe 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

IMS – The Concept /Overview

UTL - Existing Network

Why the Move to IMS?

The Challenges

IMT

IMS : OverviewIP 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 togetherA requirement for transiting to a fully converged, open and distributed architectureFrom high demand for integration for delivery of IP multimedia services using integrated devices (smartphones, etc.)

IMS - Layers and Protocols Protocols: All NGN (SIP, H323, H248, MGCP, SIGTRAN), Diameter, Legacy-SS7, R2, V5.2.Layers: Three (3) - Application, Control and UserApplication: 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 serversUser/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.

IMS - Core Architecture/Layers

IMS - Core Functions

Runs all NGN Core functions

Call controlMedia Gateway Access ControlResource AllocationProtocol ProcessingRoutingAuthenticationChargingApplication Programming Interfaces (API)Web based and presence services

IMS - ServicesAll NGN and Legacy Services

Voice - Basic, Supplementary (Wake up, Call waiting, CLI),xDSL, ISDNIP FaxIP Centrex, IVRMultimedia Services:- Video, instant messaging, program sharing, electronic white board, video conferencing/streamingIN Services:- card calling, advanced prepaid calling, VPN, Number Portability,

Unified/Smart Services:- unified messaging, colour dial tone, instant messaging.Business Services - SIP Trunking, SIP CentrexResidential Services- Voice and video telephonyIP Voice and IP Video mailVoice and Video conferencing

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.

Architecture of UTL Existing Network

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

Why the Move to IMS?

Drivers include the need to:-Move from Legacy TDM and NGN to integrate networks/services – Service integrationMeet customer unified service expectationsInnovate new applications/service offerings-multimedia services/unified communicationReduce CAPEX & OPEX-one network, many servicesFollow fast paced technological trends

UTL - IMS Network Structure

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

UTL IMS Transition Roadmap - Structure

From 2005

Since 2006

From 2013

Before 2005

From 2015

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

IMT

Anywhere, Anytime

Wireless(Terminal mobility) Global Roaming

Personal Mobility, Service Portability Virtual Home Environments(VHE) Whatever Multimedia Services

(Speech + Internet) Services

Objectives

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);

• 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;

IMT-Characteristics (cont.)

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)

IMT-Indoor Coverage Solution

• Repeaters

• Dual Mode WiFi

• 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 =