PDP Context

The packet abstracts agreement (PDP; e.g., IP, X.25, FrameRelay) ambience is a abstracts anatomy present on both the Confined GPRS Support Node (SGSN) and the Gateway GPRS Support Node (GGSN) which contains the subscriber's affair advice if the subscriber has an alive session. If a adaptable wants to use GPRS, it accept to aboriginal attach and again actuate a PDP context. This allocates a PDP ambience abstracts anatomy in the SGSN that the subscriber is currently visiting and the GGSN confined the subscriber's admission point. The abstracts recorded includes

Subscriber's IP address

Subscriber's IMSI

Subscriber's

Tunnel Endpoint ID (TEID) at the GGSN

Tunnel Endpoint ID (TEID) at the SGSN

The Tunnel Endpoint ID (TEID) is a amount allocated by the GSN which identifies the tunnelled abstracts accompanying to a accurate PDP context.

Several PDP contexts may use the aforementioned IP address. The Accessory PDP Ambience Activation action may be acclimated to actuate a PDP ambience while reusing the PDP abode and added PDP ambience advice from an already alive PDP context, but with a altered QoS profile.1 Note that the action is alleged secondary, not the consistent PDP contexts that accept no such accord with the one the PDP abode of which they reused.

A absolute of 11 PDP contexts (with any aggregate of primary and secondary) can co-exist. NSAPI are acclimated to differentiate the altered PDP context.