Patent ID: 7986671

Claim:
A mobile communications device having a processor and software executable by the processor, further configurable for having a protocol stack stored in a memory, the protocol stack having a first access stratum, a second access stratum, and a non-access stratum, and where the mobile communication device also has a communication sub-system operable to communicate with a plurality of core-network-connected wireless access networks, the processor in combination with the software configurable to cause: providing an interface between the non-access stratum with the first access stratum and with the second access stratum; activating the first access stratum to establish a communication link with a core-network over a first core-network-connected wireless access network; transferring control of the communication link to the second access stratum; and maintaining the communication link between the non-access stratum and the core-network while transferring control of the communication link to the second access stratum.