Patent ID: 8271686

Claim:
A method of transmitting packet data from a first subsystem to a terminal device via a network node of a second subsystem, the method comprising: receiving a traffic flow template (TFT) from a terminal device at a network node in a request message for activating or modifying a packet data protocol (PDP) context; receiving an interface identifier from the terminal device at the network node, the interface identifier associated with the PDP context; allocating a prefix according to an IP version 6 (IPv6) address structure at the network node when forming a logical data transmission context for the terminal device in the network node, the prefix being used to identify the terminal device; transmitting the prefix to the terminal device, wherein the IPv6 address of the terminal device comprises the received interface identifier and the prefix according to the IPv6 address structure; forming a filter to guide mapping of at least one data flow of a first subsystem to at least one data flow of a second subsystem at the network node, said filter comprising the received interface identifier, and wherein the filter is associated with the TFT template of the request message; receiving a packet from the first subsystem at the network node, the packet including an interface identifier as at least part of a destination internet protocol (IP) address for the packet; comparing, at the network node, the interface identifier of the packet from the first subsystem to the received interface identifier of the filter; in response to a successful comparison of the interface identifier of the packet from the first subsystem to the received interface identifier of the filter, mapping the received packet to the at least one data flow of the second subsystem using the destination IP address for the received packet and the filter; and transmitting the received packet to the terminal device using the mapped data flow.