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UMTS
(Universal Mobile Telecommunications System)
Telefónica Móviles España
What is UMTS?
• UMTS is one of the major new 'third generation' (3G)
mobile communications systems being developed within
the framework defined by the ITU and known as IMT-2000.
• UMTS will enable the wireless Information Society,
delivering high-value broadband information, commerce
and entertainment services to mobile users via fixed,
wireless and satellite networks.
• UMTS will speed convergence between
telecommunications, IT, media and content industries to
deliver new services and create fresh revenue-generating
opportunities.
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UMTS advantages
• Always-on
• Personalised
• Location aware
• Real-time and flexible
• Greater range of enriched multimedia services
• Higher data rates for a greater number of users
• Lower costs in long-term because of network
efficiencies
• IP transport in access and core networks
• Separation of control and transport functionalities
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Convergence of media, data &
telecom
Contents
Internet
•
•
•
•
Internet access
E-mail
Real-time images transfer
Multimedia documents transfer
Telecommunications
• Mobility
• Circuit switching services
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• Packet switching services
UMTS
•
•
•
•
•
Video on-demand
Interactive video services
Radio and television
Entertainment services
Location based services
A new value chain
CONTENTS
PROVIDER
MOBILE
PORTAL
MOBILE
INTERNET
PROVIDER
Where will be
each one?
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MOBILE
NETWOR
K
OPERAT
OR
SERVICE
S
PROVIDE
R
UMTS services forecast
• Simple and rich voice
• Location Based Services
• Business and consumer MMS
• Mobile Internet Access
• Mobile Intranet/Extranet Access
• Customised Infotainment
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UMTS General Architecture
UMTS basic architecture is split into:
• User equipment (UE): Equipment used by the user
to access UMTS services.
• Infrastructure: Physical nodes which perform
several functions required to terminate the radio
interface and to support the telecommunications
services requirements of the users.
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UMTS Basic Architecture Release
99
M
E MS
Circuit Domain
BTS
PSTN/ISD
N
BSC
GSM
BSS
MSC/VL
R
GMS
C
HLR
Other
PLMN
UE
M
E
Node
B
RNC
UTRAN
Radio Access
Network
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SGSN
GGS
N
Packet Domain
Core Network
INTERN
ET
INTRANE
TS
UMTS Basic Architecture Release
99
UMTS architecture Release 99 is an evolution of
GSM/GPRS system, with a new radio interface based on
WCDMA technology, that allows to offer new services with
high capacity.
Despite UMTS radio access network is new, UMTS core
network is similar to GSM/GPRS core network.
UMTS core network is split into two different switching
domains:
•Circuit switching (CS): Based on GSM model.
•Packet switching (PS): Based on GPRS model.
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User Equipment Domain
The user equipment is sub-divided into:
• Mobile Equipment Domain (ME): Performs radio
transmission and contains applications. It consists of:
– Mobile termination (MT): Radio transmission and related
functions.
– Terminal Equipment (TE): Contains end-to-end
applications.
• User Identity Module Domain (USIM): Contains
data and procedures which unambiguously and
securely identify itself.
USIM
UE
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MT
TE
ME
Infrastructure Domain
The Infrastructure Domain is split into:
• Access Network Domain: Consists of the physical
entities which manage the resources of the access
network and provides the user with a mechanism to
access to Core Network Domain. In UMTS the
access network is the UTRAN (Universal Terrestrial
Radio Access Network).
• Core Network Domain: Consists of the physical
entities which provide support for the network
features and telecommunications services.
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Access Network Domain UTRAN
UTRAN (Universal Terrestrial Radio Access Network) is the radio access
network in UMTS.
UTRAN consists of a set of Radio Network Subsystems (RNS)
connected to Core Network.
– A RNS consists of the Radio Network
Controller (RNC) and one or more Node Bs.
Each RNS is responsible for the resources of
RNS
RNC
its set of cells.
– RNC is responsible for the handover decisions
that require signalling to the UE. It is equivalent
to BSC in GSM network.
– Node B is responsible for radio
transmission/reception in one or more cells
to/from UE. It is equivalent to BTS in GSM
network.
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Node B
Node B
RNC
Spectrum allocation in Europe
A Node B can support FDD mode, TDD mode or dual-mode
operation.
2100
2150 2200
2250 MHz
1850 1900
1950 2000
2050
15 20
60
60
30 15
UMTS
TDD
GSM 1800 and DECT
UMTS FDD
20/35 MHz
for UTRA “unpaired”
UTRA: UMTS Terrestrial Radio
Access
TDD: Time Division Duplex
FDD: Frecuency Division Duplex
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30
UMTS satellite
2 x 60 MHz
for UTRA “paired”
Radio access technology - WCDMA
• Wideband Code-Division Multiple-Access (W-CDMA) is one
of the main technologies for the implementation of thirdgeneration (3G) cellular systems.
• W-CDMA is based on CDMA, a digital multiple access
technique specified by the Telecommunications Industry
Association (TIA) as "IS-95.“
• In W-CDMA interface different users can simultaneously
transmit at different data rates and data rates can even vary in
time.
• The radio access scheme is direct-sequence CDMA with
information spread over a bandwidth of about 5 MHz with a
chip rate of 3.84 Mcps. Modulation is dual-channel QPSK.
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CDMA Technology
• CDMA (Code-Division Multiple-Access) is a "spread spectrum"
technology, which means that it spreads the information
contained in a particular signal of interest over a much greater
bandwidth than the original signal.
• With CDMA, unique digital codes, rather than separate RF
frequencies or channels, are used to differentiate subscribers.
The codes are shared by both the mobile station (cellular
phone) and the base station, and are called "pseudo-Random
Code Sequences." All users share the same range of radio
spectrum.
• Because of the wide bandwidth of a spread spectrum signal, it is
very difficult to jam, difficult to interfere with, and difficult to
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identify.
Benefits of CDMA
• Capacity increase.
• Improved call quality, with better and more consistent
sound.
• Simplified system planning through the use of the
same frequency in every sector of every cell.
• Enhanced privacy.
• Improved coverage characteristics, allowing for the
possibility of fewer cell sites.
• Increased talk time for mobile devices.
• Bandwidth on demand.
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Core Network Domain
The Core Network Domain consists of the physical
entities which provide support for the network features
and telecommunications services. The support provided
includes functionality such as:
• Management of user location.
• Control of network features and services.
• Transfer (switching and transmission) mechanisms for
signalling and user generated information.
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Core Network Domain
The Core Network Domain is sub-divided into:
• Serving Network Domain: Represents functions that are local
to the user’s access point and thus their location changes when
the user moves. It is responsible for routing calls and for the
transport of user data/information from source to destination.
• Home Network Domain: Represents functions that are
conducted at a permanent location regardless of the location of
the user’s access point. It contains at least permanently user
specific data and is responsible for management of subscription
information.
• Transit Network Domain: It is located on the communication
path between the serving network domain and the remote party.
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UMTS security architecture
UMTS security architecture consists of the security features and
security mechanisms that assure the confidentiality, integrity,
authentication and anti-replay protection.
Five security features are defined:
•
Network access security (I): Provides users with secure access to UMTS
services, and which in particular protect against attacks on the (radio) access
link.
•
Network domain security (II): Enables nodes in the provider domain to
securely exchange signalling data and protect against attacks on the wireline
network.
•
User domain security (III): Secures access to mobile stations.
•
Application domain security (IV): Enables applications in the user and in
the provider domain to securely exchange messages.
•
Visibility and configurability of security (V): Enables the user to be
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informed if a security feature is in operation or not.
UMTS launching in TME
1 June 2002: Technical launching
• 750 base stations have been installed in 21 Spanish
cities (16 cities with more than 250000 inhabitants +
4 cities of interest).
• Network equipment suppliers (Circuit Switching):
Nortel and Ericsson.
• Technical tests of basic services over the network.
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UMTS launching in TME
Second semester 2003: Commercial launching
• The degree of madurity of 3G technology and the
standardization of operating platforms and systems will
determine the commercial launching of services.
• Besides it mainly depends on the availability of
terminals.
• The proposed basic packet of services consists of:
– Voice transmission
– Circuit-switching data transmission (64 kbps)
– Packet-switching data transmission (64 kbps)
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– Handover (UMTS)
Links
• 3GPP
www.3gpp.org
• UMTS Specifications
http://www.3gpp.org/ftp/Specs
• UMTS Forum
www.umts-forum.org
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