GPRS Core Network - Wikipedia, the free encyclopedia: "PDP Context
The PDP (Packet Data Protocol, e.g. IP, X.25, FrameRelay) context is a data structure present on both the SGSN and the GGSN which contains the subscriber's session information when the subscriber has an active session. When a mobile wants to use GPRS, it must first attach and then activate a PDP context. This allocates a PDP context data structure in the SGSN that the subscriber is currently visiting and the GGSN serving the subscribers access point. The data recorded includes.
* Subscriber's IP address
* Subscriber's IMSI
* Subscriber's
o Tunnel Endpoint ID (TEID) at the GGSN
o Tunnel Endpoint ID (TEID) at the SGSN
The Tunnel Endpoint ID (TEID) is a number allocated by the GSN which identifies the tunnelled data related to a particular PDP context.
There are two kinds of PDP contexts.
* Primary PDP Context
o Has a unique IP address associated with it
* Secondary PDP Context
o Shares an IP address with another PDP context
o Is created based on an existing PDP context (to share the IP address)
o Secondary PDP contexts may have different Quality Of Service settings
A total of 11 PDP contexts (with"
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