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Départ. Technical support- CM640
PHILIPS Consumer
Communications
Centre du Mans
7.9
GPRS Introduction
7.9.1
Presentation
The GPRS does not constitute to him alone a separate mobile network, but a supplementary layer added to a
existing GSM network.
It can be thus settled without any supplementary license. This means that all the operators who have a GSM
license can develop their network towards it.
Furthermore, the GPRS uses wavebands attributed to the GSM. that means a band in the 900 MHz, the other one
in the 1800 MHz and finally the third for the USA, in the 1900 MHz
The GPRS, also called GSM 2+, rests on the transmission of data packets. This principle, already held for example
for the protocol X.25, allows to allocate to the other communications, the time-outs of a first communication (wait of
an answer to an Internet request for example).
Conceived to reuse at most the existing GSM infrastructures, the expansion of the GPRS requires the
implementation of a network infrastructure based on the data packets routing and the introduction of bridges to lean
on existing GSM networks.
This technology, capable of supplying transfer rates rising up to 115 kb/s (against 9,6 kb/s for the GSM), offers
interesting features:
•
Several channels can be allocated to a single user;
•
Several users can share a single channel;
•
The transmission rate is independent from rising and downward links.
7.9.2
Services / Possibilities / Limitations
Domains of application
While the WAP stops in the consultation of the Internet pages, the GPRS allows to widen the service offer. Besides
the access to Internet (or Intranet), from the traditional mobiles phones, it allows a better access to e-mails
containing joined files.
A rate higher than the wired public network
Today, the transmission rate of a standard GSM network in "connected" mode does not overtake 9,6 kbit/s, even
14,4 kbit/s by establishment of specific software. It is five times less fast compared to the standard wired network,
which authorises 56 kbit/s with a V90 modem.
PHILIPS ELECTRONICS N.V. 1999
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PROCEDURE
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Page : 15 of 71
Langue : EN
Date : 25/02/03
VY-V-640-82x
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