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GPRS


What is GPRS?

The General Packet Radio Service (GPRS) network is an “always on”, private network for data. It uses the existing GSM network to transmit and receive TCP/IP based data to and from GPRS mobile devices. Private IP addresses are typically dynamically assigned within the network to mobile devices. However, Access Point Names (APN’s) provide a gateway route to other networks such as the Internet, WAP services or private corporate networks. Firewalls typically reside at the APN to isolate the public and private networks. IP addresses allocated to mobile GPRS devices are therefore not addressable from outside the GPRS network (e.g. from the Internet) without specialised services or infrastructure.

Private network access to GPRS devices

Although client GPRS devices can communicate with ease over Public and Private networks, GPRS server devices require a static IP address. Network Operators offer private APN’s to corporate networks over Leased Lines or VPN’s, where IP address assignment is managed by the customer’s corporate Network e.g. using a radius server. Alternatively, Wireless Operators in some countries offer private APN’s with static IP address support thereby creating customers their own private network within the GPRS network.

GPRS mobile device
There are a number of GPRS devices, each of which can offer GSM services too, such as voice calls and SMS.

A GPRS Mobile Phone
A GPRS Radio Card for a PC
A Hand held PC with an in-built GPRS Mobile
A remote machine
GPRS classes
There are 3 classes of GPRS device being developed, of which only class B is currently available: –

Class A – Operates in GSM and GPRS modes at the same time, and hold simultaneous voice and data sessions.
Class B – Operates in GSM and GPRS modes at the same time, and but cannot hold simultaneous calls.
Class C – Can be active in either GSM or GPRS mode, but not at the same time
Benefits
Efficient – GPRS mobile devices only use the GSM network when data is transferred. The GSM connection is not dedicated to each user, therefore it can be shared with many users resulting in efficient use of the network.
Fast – GPRS gives speeds of upto 5 time faster than GSM. GPRS offers maximum data rates of 56Kbps (down) and 14.4kbps (up), however this is shared bandwidth therefore actual data rates are potentially lower.
Payment based on data usage – Billing is not based on time, but on the amount of data actually transferred.





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  1. Guru

    General Packet Radio Service (GPRS) is a Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. GPRS data transfer is typically charged per kilobyte of transferred data, while data communication via traditional circuit switching is billed per minute of connection time, independent of whether the user has actually transferred data or has been in an idle state. GPRS can be used for services such as Wireless Application Protocol (WAP) access, Short Message Service (SMS), Multimedia Messaging Service (MMS), and for Internet communication services such as email and World Wide Web access.

    2G cellular systems combined with GPRS is often described as “2.5G”, that is, a technology between the second (2G) and third (3G) generations of mobile telephony. It provides moderate speed data transfer, by using unused Time division multiple access (TDMA) channels in, for example, the GSM system. Originally there was some thought to extend GPRS to cover other standards, but instead those networks are being converted to use the GSM standard, so that GSM is the only kind of network where GPRS is in use. GPRS is integrated into GSM Release 97 and newer releases. It was originally standardized by European Telecommunications Standards Institute (ETSI), but now by the 3rd Generation Partnership Project (3GPP).

  2. Guru

    General Packet Radio Service (GPRS)
    A GSM data transmission technique that does not set up a continuous channel from a portable terminal for the transmission and reception of data, but transmits and receives data in packets. GPRS is used to boost wireless data transmission over GSM networks. GPRS can achieve 171.2 kilobits per second (kbps), which is about three times as fast as the data transmission speeds possible over today’s fixed telecommunications networks and ten times as fast as current GSM networks. Unlike existing digital wireless Net connections, no dial-up modem is necessary.

  3. Guru

    GPRS (General Packet Radio Service) is a packet-oriented data service for data transmission in the GSM network that has been enhanced by including additional infrastructural components. Several radio channels can be bundled together, so that transmission rates of up to 171 kbps (in practice, approx. 50 kbps) are theoretically possible. Unlike HSCSD which uses curcuit switching, GPRS is based on the relaying of individual data packets. The Internet Protocol ( IP) is used for this purpose, and every mobile data device is given its own IP address. With GPRS, the user can be permanently online. The available RF channels are divided amongst all the subscribers. Billing is not on the basis of time spent online but instead is based on the amount of data transmitted. This data service is therefore especially suited to dialogue-oriented applications like WAP,i-mode(tm)and e-mail.






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