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White Paper T610/612
26
Mobile positioning
The geographic location of mobile subscribers can be
used to provide them with related information and a
variety of services. Sony Ericsson’s Mobile Positioning
System (MPS) gives operators a fast and cost-effective
way to establish and roll out location-based services.
For users of the T610/612, the integration of mobile
positioning with WAP services means that a complete
range of service and information tools is available.
More information regarding possibilities with and
technologies for mobile positioning is available at http://
www.SonyEricssonMobile.com/mps.
General Packet Radio Services
The introduction of GPRS (General Packet Radio
Services) is one of the key steps in the evolution of
today’s GSM networks for enhancing the capabilities of
data communication. Data traffic is increasing
enormously (over both wired and wireless networks),
with the growth in demand for Internet access and
services paralleling that for mobile communications.
Users want access to the Internet while they are away
from their offices and homes, and surveys have found
that the vast majority of business professionals want the
ability to send and receive e-mail, browse the WAP and
transmit text and graphics on a portable device. That is
why the main applications driving Mobile Internet
development are e-mail clients and WAP browsers.
The demand for high-speed Internet access will be the
key driver for coming generations of wireless services,
and GPRS can deliver the necessary speed. GPRS allows
innovative services to be created, enabling new and
previously inaccessible market segments to be addressed
and increasing customer loyalty.
GPRS applications can be developed as both horizontal
and vertical. Vertical applications are specific, including
those for operations such as reaching police and
emergency, taxi, delivery or automated services (vending
machines, supervision, vehicle tracking). Horizontal
applications are more generic and include those for
Internet access, e-mail, messaging, e-commerce and
entertainment.
GPRS is able to take advantage of the global coverage of
existing GSM networks. Applications developed for
GPRS can be deployed on a large scale and can reap the
associated benefits. GPRS also provides a secure
medium for connections to private networks, banking
and financial services.
With GPRS, the T610/612 sends data in “packets” at a
very high speed. The T610/612 remains connected to the
network at all times, using transmission capacity only
when data is sent or received.
Using GPRS in the T610/612
Instead of occupying an entire voice channel for the
duration of a data session, the T610/612 sends/receives
data in small packets, as needed, much like IP on the
Internet. Because of this, the T610/612 maintains a
constant online connection, its data transmission abilities
summoned by the application in use on an as-needed
basis.
The GPRS specification includes four coding schemes –
CS1, CS2, CS3 and CS4 – that allow data speeds of
9,050 bps, 13,400 bps, 15,600 bps and 21,400 bps
respectively. The T610/612 works with all four coding
schemes, but data speed will naturally vary according to
network configuration. At the moment, CS-3 and CS-4
are not supported in any live network, i.e present speed is
limited to 53,600 bps.
The GSM system limits the ability to use all eight time
slots, so the T610/612 uses up to four time slots for
receiving data, and one slot for transmitting. This means
the speed for receiving data is up to 85,600 bps and up to
21,400 bps for sending data.
Using GPRS with the T610/612 has several advantages,