ALL ABOUT THE 3G MOBILE TECHNOLOGY

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.

3. UMTS Architecture

A UMTS network consist of three interacting domains; Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN) and User Equipment (UE). The main function of the core network is to provide switching, routing and transit for user traffic. Core network also contains the databases and network management functions.

The basic Core Network architecture for UMTS is based on GSM network with GPRS. All equipment has to be modified for UMTS operation and services. The UTRAN provides the air interface access method for User Equipment. Base Station is referred as Node-B and control equipment for Node-B's is called Radio Network Controller (RNC). UMTS system page has an example, how UMTS network could be build.

It is necessary for a network to know the approximate location in order to be able to page user equipment. Here is the list of system areas from largest to smallest.

UMTS systems (including satellite)

Public Land Mobile Network (PLMN)

MSC/VLR or SGSN

Location Area

Routing Area (PS domain)

UTRAN Registration Area (PS domain)

Cell

Sub cell

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