White Paper W950

Preliminary version - PA4

3G

Increased 3G data rates, together with extended multimedia and entertainment content, has enhanced the use of mobile Internet in a revolutionary way.

The 3G (third-generation) service combines high speed radio access with IP (Internet Protocol)- based services.

The connectionless nature of IP makes access a lot faster: file downloads take less time and we can be connected to a network within a few seconds.

3G has significantly boosted network capacity allowing operators to support more users, and offer more sophisticated services.This phone is dual mode, meaning the user will be able to use W950 without having to think about which system is in operation – the handover between the two systems is seamless.

GSM and WCDMA development

Wideband technology is deployedternalin parallel with

the enhancement of the existing spectrum, reusing parts of the GSM infrastructure. All spectrum assets are valuable, as there is a substantial increase in both the number of subscribers and the volume of traffic in the networks. This seamless solution gives operators a flexible network where the systems interact according to current demand.

User experienceIn

For the consumers, using a network consisting of GSM, GPRSorand WCDMA parts is a seamless experience. GPRS allows qualified mobile Internet applications, while the introduction of WCDMA bringsFa whole new set of user services, using the full potential of wideband data transport

Handover/service continuity

The scope of this text includes service requirements for handover maintaining continuity of service to a wireless terminal, as it moves between the radio coverage area, or “cells”, associated with different base station sites. This functionality is called “handover”. It is a key requirement to allow for dual or multi-mode terminals to handover traffic from UTRAN to other

radio systems such as GERAN and vice versa. This part describes the general principles for service continuity within UMTS Radio Access Network, within GSM/GPRS and between UMTS Radio Access Network and other radio systems such as GSM/GPRS. As a principle, the requirements on service continuity characteristics should be according to the target network on which the service is maintained.

Service continuity

y

 

Service continuity shouldlsupport the following

scenarios:

 

• Continuity ofOnactive circuit switched services when moving within UMTS Radio Access Net- work,ewithin GSM/GPRS and between UMTS sRadio Access Network and GSM/GPRS coverage areas.

U• Continuity of active and packet switched sessions when moving within UMTS Radio Access Network, within GSM/GPRS and between UMTS Radio Access Network and GSM/GPRS coverage areas.

General operational considerations

Mechanisms defined to support service continuity between different radio systems or radio access modes should effectively cope with a number of coverage scenarios:

•Limited coverage in a “sea” of coverage pro- vided by another radio system or radio access mode.

•Selective operation at a geographical boundary, with extensive UMTS Radio Access Network coverage on one side, and extensive coverage from another radio system on the other side.

•Geographically co-located areas of UMTS Radio Access Network coverage and another

radio system.

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June 2006