Patent ID: 8018908

Claim:
A method, comprising: receiving a packet from a first device that supports a mobility layer protocol, wherein a mobility binding is established between the first device and a second device in a mobile communications network using the mobility layer protocol and the packet includes a registration request (RRQ) message communicated to the second device; generating a modified packet to support a packet data protocol (PDP) context by appending a PDP context identifier field to the received packet for identifying the PDP context, and also appending a tunnel header to the received packet, wherein the PDP context is provided for the registration request (RRQ) message communicated to the second device in order to use the PDP context to apply a security policy of the first device to the modified packet; and providing the modified packet to the second device, wherein the second device supports both the mobility layer protocol and the PDP context such that the PDP context is maintained and carried over the mobility binding in the mobility layer protocol to provide backward compatibility with devices that use the PDP context.