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Introduction The
GPRS
References Conclusion
SAGEM
GPRS
Mobile Phone |
Introduction:
GPRS (General Packet Radio Service) is a
packet data communications system integrated with the GSM cellular
telephone system. Standardized by ETSI in December 1997, GPRS
products are currently under development by GSM equipment vendors.
GPRS is a large, complex system that merges cellular telephone radio
transmission technology and Internet information delivery protocols.
Initial implementations of GPRS will operate within the framework of
present GSM technology. It is also anticipated that GPRS will be
adapted for use in North American TDMA cellular systems and enhanced
TDMA cellular systems (EDGE).
The GPRS specification admits
considerable flexibility in the design of network elements and in
network operation. The values assigned to a large set of parameters
influence many performance characteristics including the
relationship of GPRS data transmissions to GSM telephone traffic,
the relationship of uplink data traffic to downlink data traffic,
and the proportion of resources devoted to signaling and user
data.
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Motorola
Timeport T260 GPRS Mobile Phone |
The
GPRS:
The GPRS is an extension of the
GSM network enabling data "packets" to be transmitted at high speed,
in the same way as on the Internet. With rates up to eight times
higher than GSM, the network offers virtually instantaneous
connection.
Thanks to GPRS, SAGEM mobile phones will enable you
to surf the WEB as easily as you can today with a modem and PC, but
with the added mobility.
The GPRS world premiere was at
TELECOM Geneva 99, where it successfully passed its first test with
an Internet access from a "monoslot" 1+1 SAGEM GSM. This was
confirmed two months later when an MC 850 GPRS "multislot" 3+1*
mobile was used at the "Semaine des Télécoms 99" in Paris. During
the Cebit 2000 in Hannover, SAGEM demonstrated successful mobile
Internet access at a rate of 53.6 kbit/s, using a 4+1* "multislot"
GSM/GPRS on-going connection [3].
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GPRS offers packet-switched connections to data
networks via mobile technology. It is designed to allow faster and
easier Internet access with continuous connectivity, and enables
applications including multimedia messaging, wireless corporate
intranet, remote control and maintenance of appliances. It is also
considered part of the migration to third generation (3G) mobile
networks [4].
The advantages
of GPRS technology allows users to stay connected to the Internet by
using packet switching technology providing faster downloads as no
time is spent attempting to access a dial-up connection. A users
favorite information and entertainment sites are always available
via GPRS without having to maintain a continuous phone call
[8].
Not only does
Vodafone's GPRS service greatly enhance your WAP experience, it also
lets you stay permanently connected to the mobile Internet without
running up a huge phone bill. This is because with GPRS, you are
only charged for the amount of information you send and receive, not
the length of time you use your phone. This means that once switch
on your GPRS phone in the morning and connect to the mobile
Internet, you can stay on all day - you don't need to connect and
disconnect to the Net each time you want to access a service. This
is known as being "always on" because your GPRS phone is always
ready for you to use the mobile Internet, saving you time and
hassle.
The "always on" capability of GPRS means that you don't
need to worry about your mobile Internet session being interrupted
by phone calls either. With Vodafone's GPRS service, you can simply
pause your browsing session, take the call, and then carry on
reading the page you were on already. It's another handy timesaving
function of GPRS that enhances your enjoyment of WAP.
So with
Vodafone's new GRPS service and Vizzavi's WAP site, you can access
the information you need at lightning speed and have the timesaving
convenience of being permanently connected to the mobile Internet
[9].
Anite Telecoms
has been monitoring GPRS from a user's perspective with its wireless
data performance tool, WAM, which the company launched earlier this
month. It has so far only recorded data transfer rates of 8kbit/s
much lower than predicted.
Anite's business manager for
WAM, Warren Saunders, said he was surprised to see that data
transfer rates were lower than those predicted by companies offering
the service. "We were amazed that the wireless data revolution, like
WAP before it, is less than impressive," he said [10].
GPRS is a
packet-based wireless communication service that, promises data
rates from 56 up to 114 Kbps and continuous connection to the
Internet for mobile phone and computer users GPRS is based on
"regular" GSM (with the same modulation) and will complement
existing services such circuit-switched cellular phone connections
such as SMS or cell broadcast. Voice over Ip over GPRS is also
explored.
In theory, GPRS packet-based service should cost users
less than circuit-switched services since communication channels are
being used on a shared-use, as-packets-are-needed basis rather than
dedicated only to one user at a time. It should also be easier to
make applications available to mobile users and Wap or i-mode should
far more attractive for the user. In addition to the Internet
Protocol GPRS supports X.25, a packet-based protocol that is used
mainly in Europe.
Operator should deploy GPRS very fast as most
of the interoperability test between the network and the Handset are
now finished (September'00) and because GPRS is mainly a software
upgrade for the BTS, BSC and servers [12].
GPRS data
speeds are expected to reach 100 Kbps. Another GSM 2.5G packet
technology, Enhanced Data rates for GSM Evolution (EDGE), will boost
data rates to 384 Kbps if/when deployed.
Beginning in the 2nd
half of 2001, Europe will transition to 3G, by uptaking 2.5G GPRS
services. The overall growth rate will decline, the migration of
users from "Basic GSM" to GPRS, and ultimately to W-CDMA (starting
in 2003), will provide a new 'revenue engine'for operators and
manufacturers.
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