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White Paper V600
15 August 2005
Multiple sessions
With regard to simultaneous connectivity, multiple
sessions, Sony Ericsson supports the 3GPP™ (3rd
Generation Partnership Project) specification 3GPP
TS 22.101 which states that 3GPP specifications
shall enable the user of a single terminal to estab-
lish and maintain several connections simultane-
ously. It shall efficiently cater for applications which
have variable requirements relating to specific QoS
(Quality of Service) parameters (for example
throughput) whilst meeting other targets.
Examples of use cases in 3G
mode
• One voice and one packet data session:
Photo: A voice call is connected, a photo is taken
with the integrated camera and sent, either via
MMS or via email.
• Two simultaneous packet data sessions:
Streaming: A WAP browsing session is ongoing, an
audio or video clip streaming session is started, for
example, from a hyperlink.
Gradual change and development of 3G
The third-generation is a technology shift taking
mobile telephony to a higher level. The term
describes a new generation of wireless systems
that offer services and functions far beyond the era
when mobile phones were used for voice calls only.
When taking GSM customers into the world of 3G,
operators will not have to switch their networks
from one system to another. The move from 2G to
3G optimizes the existing infrastructure, enabling it
to co-exist with the new WCDMA system.
GSM equipment – enhanced with GPRS – and its
functions will continue to exist within the 3G sys-
tem. Old and new technology will complement
each other and form a highly flexible network sys-
tem, with a capacity that gives new meaning to
mobility.
GSM and WCDMA development
Building the network
The combining of GSM with GPRS, and the intro-
duction of WCDMA technology in a new spectrum,
can be done gradually. The new wideband technol-
ogy can be deployed in parallel with the enhance-
ment of the existing spectrum, re-using parts of the
GSM infrastructure.
Even when WCDMA is fully expanded, GSM-based
parts of the network will continue to play a crucial
role in serving the operators’ needs for capacity. All
spectrum assets will be valuable, as there will be a
substantial increase in both the number of sub-
scribers and the volume of traffic in the networks.
With a seamless solution, operators will have 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 will be 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.