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1 Characteristics of the GPRS network
The GPRS devices use the Global Packet Radio Service technology within the GSM
communication network to communicate, send and receive information. Used protocol is
TCP/IP.
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Benefits and features of GPRS communication
Continuous connection with the network:
Connection between two communication points is being established much faster than
at the GSM voice devices.
Data quantity Invoicing:
The provider of the network is invoicing the quantity of communication flow, not the
time used for communication. Therefore, only the real sent and received data quantity
is being invoiced.
Higher speed of data flow than with the classical radio communication:
The speed of communication on the receiver side can be up to 40kbit/s, and on the
transmitting side up to 20kbit/s.
The available connection time and speed at the specific GPRS network depends on the
used devices, number of users in the specific cell and the type of applications. There are
no reserved sources in the GPRS network therefore the quality of service for data
transmission can not be guaranteed.
In case of data transmission through GPRS network, it is possible to divide it in two
parts: the wired and the wireless carrier part.
The characteristics of the wireless part is that the connection time is higher when
establishing the connection for the first time, if there was no data flow for a longer period
(more than 40 seconds), or if available communication channels count is low, because
too many users are sharing (many GPRS users are connected to the same cell).
Therefore, the quality will be:
 The delay can vary from 0.6 – 3sec, for the reasons mentioned above
 The available speed can be 0 – 40kbit/s, depending on the number of users in the cell,
i.e. the types of devices used.
Naturally, these parameters are affected with the radio circumstances (interference,
signal strength), but we can accept for the basic rule the fact that where a good phone
calls can be made with GSM voice communication, the GPRS should also have a good
radio quality.
If you can not achieve good quality, an external antenna should be used, or it is
necessary to change provider.
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