The GPRS Full Form is General Radio Packet Services.
What is GPRS?
General Radio Packet Services (Full Form of GPRS) is a wireless communication system that transmits data in the form of packets. General Radio Packet was the evolution of 2G GSM. It increases the rate of transfer of data from the usual data transfer techniques. The higher data rates make it possible for the users to take part in video conferences and interact with multimedia Web sites and similar applications using mobile handheld devices as well as notebook computers.
Access to GPRS
The Mobile Stations (MS) are required to use GPRS services as the existing GSM phones do not handle the enhanced packet data transfer. Various types of mobile stations can exist, including a high-speed version of mobile phones to support high-speed data access, a new PDA device with an embedded GSM phone, and PC cards for laptop computers. These mobile stations can also make voice calls using GSM. Each Base Station System needs to install one or more Packet Control Units (PCUs) and a software upgrade. The PCU provides a physical and logical data interface to the Base Station Subsystem (BSS) for packet data traffic. The BTS can also require a software upgrade from time to time. GPRS has two Support Nodes called Gateway GPRS Support Nodes (GSNs) and, Serving GPRS Support Node (SGSN) that acts as an interface and a router to external networks.
GPRS introduces the concept of a Routing Area. This concept is similar to LAN in GSM, except that it generally contains fewer cells. Since routing areas are smaller than location areas, fewer radio resources are used while broadcasting a message.
The multiple access method used in the GPRS system is the combination of both FDD and TDMA. The packets sent by the GPRS have constant length, corresponding to the GSM time slot. During a session, one pair of uplink and downlink frequency channels is assigned to a user. The downlink uses first come first served packet scheduling, reservation scheme is used by uplink channels. Several channels are being occupied at the same time with the use of GPRS when data is to be transferred. Whenever the channels are free it is available for other services and other GPRS subscribers. By this way of dynamic allotment of channels, the utilization of the radio infrastructure is optimized properly.
GPRS packet transmission provides a user-friendly billing than that offered by circuit-switched services. In circuit-switched services, billing is based on the duration of the connection, whereas in the GPRS system the billing system is based on the duration of the connection. The connection of the remote station is not reserved and kept left open during the connection time but is occupied during the time of transmission.
But one of the disadvantages GPRS has is that the bandwidth may drop when many users try to access the network at the same time.