A PDP context is a data protocol structure that is present on both SGSN and GGSN. It contains information regarding the subscriber's session during subscriber's active session. The subscriber-related data within the PDP context information includes: IP address, IMSI information, and Tunnel ID (TEID). Therefore access to the external packet-switching network can be achieved through a PDP context specification. The data associated to the PDP context is consisted of information including the MS PDP address (IP address), the packet-switching network type, the GGSN reference, and the requested QoS. A PDP context is identified and handled by a mobile's PDP address within the following entities: SGSN and GGSN and the MS. Within a given MS several PDP contexts can be activated at the same time.
APDP context is created through a PDP context activation procedure, which may be initiated either by the network or by the MS. Before PDP context negotiation, the MS is always GPRS-attached.
To remove a PDP context a PDP context deactivation procedure is required. This procedure may be initiated either by the network (SGSN or GGSN) or through the MS itself. The PDP context deactivation procedure may be initiated either during the GPRS detach, delete subscriber data procedures, or during an application deactivation.
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