Sony Ericsson P990i - Manual (Page 52)

White Paper P990i
52 January 2006
Preliminary version - P1F
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on
fiden
tial
If the phone lock is set to power on, everytime the
P990i is switched on the user will have to enter a
predefined code. If the phone lock is set to when SIM changed the
user will be asked for the phone lock code when
the P990i powers up.
SIM card lock
The SIM card lock can be set to off or power on.
If the SIM card lock is set to off the SIM can be
used in any mobile device where the user know the
phone lock (if set).
If the SIM card lock is set to at power on, everytime
the P990i is switched on the user will have to enter
a predefined code.
3G
Increased 3G data rates, together with extended
multimedia and entertainment content, has
enhance the use of mobile Internet in a revolution-
ary 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 P990i
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 deployed in parallel with
the enhancement of the existing spectrum, re-
using 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 experience
For the consumers, using a network consisting of
GSM, GPRS and WCDMA parts is a seamless
experience. GPRS allows qualified mobile Internet
applications, while the introduction of WCDMA
brings a whole new set of user services, using the
full potential of wideband data transport
Handover/service continuity
The scope of this text includes service require-
ments for handover maintaining continuity of serv-
ice to a wireless terminal, as it moves between the
radio coverage area, or “cells”, associated with dif-
ferent 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 princi-
ples for service continuity within UMTS Radio
Access Network, within GSM/GPRS and between
UMTS Radio Access Network and other radio sys-
tems 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
Service continuity should support the following
scenarios: