29-04-2014, 01:12 PM
SEMINAR ON GPRS
GPRS.ppt (Size: 270.5 KB / Downloads: 22)
INTRODUCTION TO GPRS
GPRS will undoubtedly speed up a handset's Internet connection - but it remains to be seen exactly how much speed can be achieved out of the system
. GPRS works by aggregating a number of separate data channels. This is possible because data is being broken down into small 'packets' which are re-assembled by the receiving handset back into their original format.
GPRS ARCHITECTURE
GPRS Subscriber Terminals
GPRS BSS
GPRS Networks Node
GPRS Mobility Management
GPRS SUBSCIBER TERMINALS
New terminals are required because existing GSM phones do not handle the enhanced air interface, nor do they have the ability to packetize traffic directly.
A variety of terminals will exist, as described in a previous section, including a high-speed version of current phones to support high-speed data access.
WORKING OF GPRS
Each voice circuit in GSM transmits the speech on a secure 14kbps digital radio link between the mobile phone and a nearby GSM transceiver station.
The GPRS service joins together multiple speech channels to provide higher bandwidth data connections for GPRS data users. The radio bandwidth remains the same, it is just shared between the voice users and the data users.
WORKING-RADIO INTERFACE
Each GSM radio transceiver uses Time Division Multiplexing to deliver eight voice circuits on one radio channel.
Maximum numbers are limited by many factors including - operators radio license, interference with other nearby GSM cells, cost of equipment, capacity of radio site infrastructure etc.
Each 14kbps channel may be shared by multiple 'connected' GPRS users.
GPRS SECURITY
The radio interface is considered to be relatively secure being controlled by the GSM network's security - (SIM card + HLR). Security issues arise when data needs to leave the GPRS network to be delivered to either the Internet or a company LAN.
Internet connectivity is the cheapest and most common - and here you can take charge of security by encrypting sensitive data.
CONCLUSION
From this we can conclude that E-Commerce,Banking ,Financial Trading, Unified Messaging are the fields where GPRS is very much advantageous.
But the areas like limited cell capacity,lower speeds,and other certain limitations are the areas where it needs to improve.
GPRS is classified as a 2.5G (or 2G Plus) technology because it builds upon existing network infrastructure
In order to compete with 3G, EDGE must offer links running at 384 Kbit/s and originally this equated to running GPRS three times faster. However, because GPRS has proved much slower than expected, it now needs to be seven times faster.