2 thg 10, 2008
UMTS Overview
Table of Contents
1. 3G Systems
2. UMTS Services
3. UMTS Architecture
4. Core Network
5. Radio Access
6. User Equipment
1. 3G Systems
3G Systems are intended to provide a global mobility with wide range of services including telephony, paging, messaging, Internet and broadband data. International Telecommunication Union (ITU) started the process of defining the standard for third generation systems, referred to as International Mobile Telecommunications 2000 (IMT-2000). In Europe European Telecommunications Standards Institute (ETSI) was responsible of UMTS standardisation process. In 1998 Third Generation Partnership Project (3GPP) was formed to continue the technical specification work. 3GPP has five main UMTS standardisation areas: Radio Access Network, Core Network, Terminals, Services and System Aspects and GERAN.
3GPP Radio Access group is responsible of:
Radio Layer 1, 2 and 3 RR specification
- Iub, Iur and Iu Interfaces
- UTRAN Operation and Maintenance requirements
BTS radio performance specification
Conformance test specification for testing of radio aspects of base stations
Specifications for radio performance aspects from the system point of view
3GPP Core Network group is responsible of:
Mobility management, call connection control signalling between the user equipment and the core network.
Core network signalling between the core network nodes.
Definition of interworking functions between the core network and external networks.
Packet related issues.
Core network aspects of the lu interface and Operation and Maintenance requirements
3GPP Terminal group is responsible of:
Service capability protocols
Messaging
Services end-to-end interworking
USIM to Mobile Terminal interface
Model/framework for terminal interfaces and services (application) execution
Conformance test specifications of terminals, including radio aspects
3GPP Services and System Aspects group is responsible of:
Definition of services and feature requirements.
Development of service capabilities and service architecture for cellular, fixed and cordless applications.
Charging and Accounting
Network Management and Security Aspects
Definition, evolution, and maintenance of overall architecture.
2. UMTS Services
UMTS offers teleservices (like speech or SMS) and bearer services, which provide the capability for information transfer between access points. It is possible to negotiate and renegotiate the characteristics of a bearer service at session or connection establishment and during ongoing session or connection. Both connection oriented and connectionless services are offered for Point-to-Point and Point-to-Multipoint communication.
Bearer services have different QoS parameters for maximum transfer delay, delay variation and bit error rate. Offered data rate targets are:
- 144 kbits/s satellite and rural outdoor
- 384 kbits/s urban outdoor
- 2048 kbits/s indoor and low range outdoor
UMTS network services have different QoS classes for four types of traffic:
Conversational class (voice, video telephony, video gaming)
Streaming class (multimedia, video on demand, webcast)
Interactive class (web browsing, network gaming, database access)
Background class (email, SMS, downloading)
UMTS will also have a Virtual Home Environment (VHE). It is a concept for personal service environment portability across network boundaries and between terminals. Personal service environment means that users are consistently presented with the same personalised features, User Interface customisation and services in whatever network or terminal, wherever the user may be located. UMTS also has improved network security and location based services.
1. 3G Systems
2. UMTS Services
3. UMTS Architecture
4. Core Network
5. Radio Access
6. User Equipment
1. 3G Systems
3G Systems are intended to provide a global mobility with wide range of services including telephony, paging, messaging, Internet and broadband data. International Telecommunication Union (ITU) started the process of defining the standard for third generation systems, referred to as International Mobile Telecommunications 2000 (IMT-2000). In Europe European Telecommunications Standards Institute (ETSI) was responsible of UMTS standardisation process. In 1998 Third Generation Partnership Project (3GPP) was formed to continue the technical specification work. 3GPP has five main UMTS standardisation areas: Radio Access Network, Core Network, Terminals, Services and System Aspects and GERAN.
3GPP Radio Access group is responsible of:
Radio Layer 1, 2 and 3 RR specification
- Iub, Iur and Iu Interfaces
- UTRAN Operation and Maintenance requirements
BTS radio performance specification
Conformance test specification for testing of radio aspects of base stations
Specifications for radio performance aspects from the system point of view
3GPP Core Network group is responsible of:
Mobility management, call connection control signalling between the user equipment and the core network.
Core network signalling between the core network nodes.
Definition of interworking functions between the core network and external networks.
Packet related issues.
Core network aspects of the lu interface and Operation and Maintenance requirements
3GPP Terminal group is responsible of:
Service capability protocols
Messaging
Services end-to-end interworking
USIM to Mobile Terminal interface
Model/framework for terminal interfaces and services (application) execution
Conformance test specifications of terminals, including radio aspects
3GPP Services and System Aspects group is responsible of:
Definition of services and feature requirements.
Development of service capabilities and service architecture for cellular, fixed and cordless applications.
Charging and Accounting
Network Management and Security Aspects
Definition, evolution, and maintenance of overall architecture.
2. UMTS Services
UMTS offers teleservices (like speech or SMS) and bearer services, which provide the capability for information transfer between access points. It is possible to negotiate and renegotiate the characteristics of a bearer service at session or connection establishment and during ongoing session or connection. Both connection oriented and connectionless services are offered for Point-to-Point and Point-to-Multipoint communication.
Bearer services have different QoS parameters for maximum transfer delay, delay variation and bit error rate. Offered data rate targets are:
- 144 kbits/s satellite and rural outdoor
- 384 kbits/s urban outdoor
- 2048 kbits/s indoor and low range outdoor
UMTS network services have different QoS classes for four types of traffic:
Conversational class (voice, video telephony, video gaming)
Streaming class (multimedia, video on demand, webcast)
Interactive class (web browsing, network gaming, database access)
Background class (email, SMS, downloading)
UMTS will also have a Virtual Home Environment (VHE). It is a concept for personal service environment portability across network boundaries and between terminals. Personal service environment means that users are consistently presented with the same personalised features, User Interface customisation and services in whatever network or terminal, wherever the user may be located. UMTS also has improved network security and location based services.
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