GPRS (general packet radio service) is used as a data services upgrade to any GSM network. It allows GSM networks to be truly compatible with the Internet. GPRS uses a packet-mode technique to transfer bursty traffic in an efficient manner. It allows transmission bit rates from 9.6 Kbps to more than 150 Kbps per user.The two key benefits of GPRS are a better use of radio and network resources and completely transparent IP support. GPRS optimizes the use of network and radio resources. It uses radio resources only when there is data to be sent or received. As a true packet technology it allows end user applications to only occupy the network when a payload is being transferred, and so is well adapted to the very bursty nature of data applications. Another important feature of GPRS is that it provides immediate connectivity and high throughput.
Applications based on standard data protocols such as IP and X.25 are supported. In GPRS four different quality of service levels are supported. To support data applications GPRS utilizes several new network nodes in addition to the network nodes in the GSM PLMN. These nodes are responsible for traffic routing and other interworking functions with external packet-switched data networks, subscriber location, cell selection, roaming and many other functions that any cellular network needs for operation.
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