Patent ID: 7283497

Claim:
A method for transferring a tunnel from a first controlling node in a mobile radio communications system to a second controlling node, the mobile radio communications system having controlling nodes and a gateway node, with at least one of the nodes being a node in accordance with Version 0 of a GTP protocol and other nodes being nodes of a Version 1 of General Packet Radio Service (GPRS) Tunnel Protocol (GTP) protocol, comprising: receiving a message at the second controlling node about a requirement to transfer the tunnel from a terminal; and passing a request for matching the context relating to the tunnel to the gateway node, wherein when the first controlling node is a node of the Version 0 and the second controlling node and the gateway node are nodes of the Version 1, the request for adaptation of the context includes details of International Mobile Subscriber Identity (IMSI) Network Layer Service Access Point Identifier (NSAPI) for a relevant tunnel.