| 摘要 |
The present invention relates to a method for context handling when a user equipment (10), UE, with established bearers towards a Gateway GPRS Support Node (11), GGSN, and a Packet Data Network GGSN (12), PGW-GGSN, moves from a previous Access Network, AN, to a present AN. The previous AN communicates with the GGSN (11) and the PGW-GGSN (12) via a previous Mobility Control Node (13), MCN. The present AN communicates with the PGW-GGSN (12) via a present MCN (14). The method comprises a step where the UE (10) detects (15) that it has entered a Mobility Area, MA, belonging to the present AN and requests for a Mobility Area Update, MAU, at the present MCN (14). The method is particularly characterized in the steps of: —The present MCN (14) derives (16) the previous MCN (13) from the MAU request and initiates a handshake procedure including exchange of capabilities with the previous MCN (13). —The present MCN (14) sends a context acknowledge message to the previous MCN (13) when it has accepted the MAU request and updated the established bearers towards the PGW-GGSN (12). —The previous MCN (13) removes at least one Packet Data Protocol, PDP, context existing in the GGSN (11) as a result of the context acknowledge message. |
