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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 capabili-
ties of data communication. Data traffic is increas-
ing enormously (over both wired and wireless
networks), with the growth in demand for Internet
access and services paralleling that for mobile
communications.
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 creation of innovative serv-
ices, makes it possible to address new and previ-
ously inaccessible market segments and increases
customer loyalty.
Using GPRS in the Z200/Z208
Instead of occupying an entire voice channel for
the duration of a data session, the Z200/Z208
sends/receives data in small packets, as needed,
much like IP on the Internet. Because of this, the
Z200/Z208 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 max 21,400 bps per slot, respectively. The
Z200/Z208 works with all four coding schemes, but
data speed naturally varies 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 Z200/Z208 uses up to four time
slots for receiving data, and one slot for transmit-
ting. 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 Z200/Z208 has several
advantages, for example:
• Constant connection
• High speed
GPRS applications can be developed as both hori-
zontal and vertical. Vertical applications are spe-
cific, including those for operations such as
reaching police and emergency, taxi, delivery or
automated services (vending machines, supervi-
sion, vehicle tracking). Horizontal applications are
more generic and include those for Internet access,
e-mail, messaging, e-commerce and entertain-
ment.
GPRS is able to take advantage of the global cov-
erage 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
banking and financial services.
• Automatic access to increased bandwidth while
downloading large files such as pictures and
sounds
• Cost efficiency
• Use of transmission capacity only when needed
to reduce cost
• WAP over GPRS
• Access to Internet via WAP at high speed and
with a constant connection.
• Provide settings
• Receive GPRS configuration settings from the
provider over the air, OTA, making manual con-
figuration unnecessary.
• User controlled settings
• Take advantage of full user control in the data
connections menu, establishing multiple
descriptions and accessing advanced settings
for GPRS.
Interruption of GPRS data account
When the user is using WAP via GPRS on the
Z200/Z208, the GPRS connection is automatically
disconnected when the user answers an incoming
call. However, when the call has ended, the user is
given the possibility to resume the WAP session.
17
Z200/Z208
White Paper
February 2004
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