GPRS architecture in wireless communication
GPRS stands for General Packet Radio Service. It is the modified version of GSM architecture service. In GSM architecture we can only transport the voice signal. But if signal consists of the data then only GSM architecture cannot use. For that there are two more software components are used, SGSN (Serving GPRS supporting Node) and GGSN (Gateway GPRS supporting Node).
In GSM architecture there is one component called BSC. But in GPRS there is one component is added to BSC called PCU. PCU stands for Packet Control Unit. If signal comes to BSC and that signal contains data, then PCU routes to the SGSN. Interface is used between BSC and PCU is FRI interface. After signal comes to SGSN, it delivers the data packet to the GGSN. GGSN routes the data packet to the data network (PDN- Predefined Data Network).
Task of SGSN :
- Packet Delivery
- Mobility management
- apply/ sign off of terminals
- LLC (Logical Link Control) management
Task of GGSN :
- Mediator between GPRS between backbone and external data networks.
- Saves current data for the SGSN address of the participant as well as their profile and data for authentication and invoice.