General Packet Radio Sevice

GPRS (General Packet Radio Sevice) is teknilogi sending data in packets by utilizing radio waves. GPRS is a wireless communication technology two and a half generation (2.5G) which is the development of technologies of GSM (2G). As wireless technology, we can utilize GPRS for accessing the internet anywhere as long as we are within range of a GPRS signal The need for mobile communication industry will lead into ne of the eknologi GPRS data communication is widely used this sat. GPRS has elajuan fast data transfer, which can reach 115kbps. Although in practice, the speed of GPRS data transfer is still in the 25-30 kbps.
In theory, GPRS promises speeds ranging from 56 kbps to 115 kbps, allowing internet access, multimedia data delivery to computers, notebooks and handheld computers.
However, in its implementation, it depends on the following factors:
• Configuration and allocation of time slots at the level of BTS
• Software used
• Support mobile phone features and applications that are used
Main Components
The main components of the GPRS network is:
• GGSN (Gateway GPRS Support Node): gateway GPRS network link to the Internet. The function of this component is the interface to the PDN (Public Data Network), information routing, network screening, screening user, address mapping.
• SGSN (Serving GPRS Support Node): BSS network connecting gate / BTS to the GPRS network. This component serves to deliver data packets to the MS, HLR updates to customers, new customer registration.
• PCU: BSS-level component that connects the terminal to the GPRS network
How it Works
SGSN in charge:
1 Send the packet to the Mobile Station (MS) in the area
2 Sending a number of questions to the HLR to obtain customer data profile (GPRS mobility management)
3 Detecting new MS-GPRS service in an area under their responsibility (location management)
4. SGSN is connected to the GSM BSS with Frame Relay connections through the PCU (Packet Control Unit) in the BSC
GGSN charge:
1 As an interface to external IP networks such as the public Internet or a mobile service provider
2 Updating the routing information from the PDU (Protocol Data Units) to the SGSN.
GPRS uses packet switch communication system as a way to transmit data. Packet switch is a system in which the data to be transmitted is divided into small parts (packets) transmitted and then the data is converted back to the original. The system can transmit thousands and even millions of packets per second. Transmission is done via (Public Land Mobile Network) by using an IP backbone. Because it allows for the use of the transmission channel PLMN simultaneously by other users, the cost of access to GPRS, in theory, cheaper than the cost of access to the CSD. GPRS is designed to provide the data packet transfer services on GSM networks at speeds better than GSM. Better speed is obtained by using a coding scheme (CS) which is different from GSM.