AN ARRANGEMENT FOR CLEANING UP HANGING PDP CONTEXTS IN GGSN

摘要

The present invention provides an arrangement by which an affected GGSN in a mobile packet switched communication system can initiate a removal of "hanging" PDP contexts. This is obtained by introducing a new supervision mechanism in the GGSN. The supervision mechanism discovers a possible hanging PDP Context and interrogates the SGSN to check the validity of the PDP Context. If the PDP Context is invalid, it is removed in the GGSN. The supervision mechanism is implemented as a guard timer. The timer will monitor the activity (signaling or payload) registered for a PDP Context. If no activity is registered for this PDP Context before the timer expires, the PDP context is regarded as possibly hanging.