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
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
IMS – The Concept /Overview
UTL - Existing Network
Why the Move to IMS?
The Challenges
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;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.)
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.
IMS - Core Architecture/Layers
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
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
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 integration
 Meet customer unified service expectations
 Innovate new applications/service offeringsmultimedia services/unified communication
 Reduce CAPEX & OPEX-one network, many
services
 Follow 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
Before 2005
From 2005
Since 2006
From 2013
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
Objectives
 Anywhere, Anytime
 Wireless(Terminal mobility)  Global Roaming
 Personal Mobility, Service Portability  Virtual
Home Environments(VHE)
 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,
 144 kbps for high mobility,
 384 kbps with restricted mobility and,
 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:
 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 =