GPRS (General Packet Radio Service) is a packet data transmission technology for GSM mobile networks that enabled second-generation networks to provide persistent connectivity to the internet and other IP-based services. GPRS became an intermediate stage between classic 2G networks and third-generation mobile networks, which is why it is often referred to as a 2.5G technology.
Unlike classic GSM data transmission, where a connection could occupy a dedicated channel for the entire session, GPRS transmits information in packets and uses radio resources as needed.
How GPRS Works
During data transmission, information is divided into small packets. These packets are transmitted over the GSM radio network and then routed through the operator’s infrastructure to an external packet data network, such as the internet.
Radio resources can be dynamically shared among multiple subscribers. If a device is temporarily neither sending nor receiving data, it does not need to continuously occupy a dedicated channel. This allows mobile network resources to be used more efficiently.
Special network nodes were added to the GSM architecture to support GPRS. The SGSN (Serving GPRS Support Node) serves mobile devices within the packet network, tracks their location, and handles packet transmission. The GGSN (Gateway GPRS Support Node) acts as a gateway between the operator’s GPRS network and external packet data networks.
GPRS Data Transmission Speed
GPRS uses GSM radio channel time slots to transmit data. A device can use several of these time slots simultaneously, so the actual speed depends on the capabilities of the terminal, network configuration, radio signal quality, and current network load.
In theory, the technology can provide speeds of up to approximately 171.2 Kbit/s if all eight time slots are available to a single device and the most efficient coding scheme is used. In real-world networks, speeds were typically significantly lower.
By modern standards, GPRS is slow, but this bandwidth may still be sufficient for transmitting small amounts of data.
How GPRS Differs from GSM and EDGE
GSM is a mobile communication standard whose infrastructure provides the basis for GPRS. GSM was originally designed primarily for voice calls and SMS, while GPRS added efficient packet data transmission.
The next stage of development was EDGE (Enhanced Data rates for GSM Evolution). This technology uses more efficient modulation methods and enables higher data transmission speeds while remaining compatible with GSM infrastructure.
In simplified terms, the development of mobile data transmission in second-generation networks can therefore be represented as GSM → GPRS → EDGE, followed by the widespread adoption of 3G and subsequent generations of mobile networks.
Where GPRS Is Used
GPRS played an important role in the development of mobile internet access. Before the widespread adoption of 3G, the technology was used for web browsing, email, messaging, and other online services on mobile phones.
Today, its importance for consumer mobile internet access has decreased significantly. However, GPRS can still be used in equipment that needs to transmit small amounts of data and does not require a high-speed connection. Examples include GPS trackers, payment terminals, monitoring systems, telemetry equipment, security devices, and some M2M solutions.
The availability of such connectivity depends on whether the operator continues to maintain a 2G network. GSM/GPRS networks are gradually being phased out in many countries, so when using such equipment, it is important to consider whether the technology remains available on the specific mobile network.