Patent ID: 9204343
Filing Date: 2015-12-01
Classification: H04W

Abstract:
1. A method for context handling when a user equipment (UE) with established bearers towards a Gateway GPRS Support Node (GGSN) and a Packet Data Network GGSN(PGW) moves from a previous Access Network (AN) to a present AN, the previous AN communicating with the GGSN and the PGW via a previous Mobility Control Node (MCN) and the present AN communicating with the PGW via a present MCN, the method comprising the steps of: the present MCN deriving the previous MCN from a Mobility Area Update (MAU) request from the UE and performing a handshake procedure including an exchange of capabilities with the previous MCN, the handshaking procedure including (i) the present MCN sending to the previous MCN a first message indicating that the present MCN is capable of sending information about a Packet Data Protocol (PDP) context existing in the GGSN that should be deleted by the previous MCN, and (ii) the present MCN receiving a second message transmitted by the previous MCN in response to the first message, the second message indicating whether the previous MCN is capable of handling the information about the PDP context; and as a result of receiving the second message, the present MCN sending a context acknowledge message to the previous MCN after the present MCN has accepted the MAU request and updated the established bearers towards the PGW, wherein a content of the context acknowledge message is based on information provided by the second message.