GPRS PDP Context - General Packet Radio Service (GPRS)

What is GPRS PDP Context?

Packet Data Protocol (PDFP) addresses are network layer addresses. Network layer addresses are the same Open Standards Interconnect [OSI] model layer 3. As GPRS systems support both X.25 and IP network layer protocols, PDF address can be IP, X.25 or both.
Gateway GPRS Support Node (GGSN), sends the packet data traffic from public packet data network to the PDF addresses as shown in figure.

GPRS PDP Context

The network connects the devices only through GGSN and the mobility of the mobile station is hidden from the rest of the packet data network and from other devices which are connected to network.

At Subscriber’s home network GGSN, the PDP addresses are assigned statically. Similarly, dynamically assigned PDP addresses are stored at user’s home network or the one that user is visiting.

When a Mobile Station is already in contact with SGSN and about to transfer data, it should activate a PP address which creates an association between SGSN and GGSN that has PDP address anchored.

By associating SGSN and GGSN, a record is created and is called the PDP context.

A Mobile Station can have many PDP addresses that are active same time but connected to single SGSN.

As many addresses are anchored to different GGSN, the packets coming from the public packet data network at a GGSN for a particular PDP address will be communicated. If the GGSN doesn’t have active PDP context for that address it will cancel the packets transfer. And the GGSN will try to activate a PDP context with a Mobile Stations if the PDP address is statically assigned.

All rights reserved © 2018 Wisdom IT Services India Pvt. Ltd Protection Status

General Packet Radio Service (GPRS) Topics