Patent ID: 8488628

Claim:
Apparatus for a wireless device operable to communicate data, in a radio communication system having a PLMN “Public Land Mobile Network) and a GAN (Generic Access Network) said apparatus comprising: a communication transferor configured to determine a need for rove-in from the PLMN to the GAN; a frame size calculator embodied at the wireless device and configured to calculate an optimum Logical Link Control (LLC) frame size of a frame into which the data to be communicated is to be formatted, upon a determination that a rove-in by the wireless device is needed; a frame size negotiation initiator embodied at the wireless device, configured to initiate a frame size negotiation of the frame into which the data to be communicated is to be formatted, and configured to initiate the negotiation of the frame size upon a determination that a rove-in by the wireless device to the GAN is needed, the frame-size negotiation utilizing the optimum LLC frame size calculated by said frame size calculator; a receiver that receives a response message returned to the wireless device from the PLMN identifying one of the optimum LLC frame size and an alternate LLC frame size to be used; a calculator that calculates a user data MTU size based on the identified one of the optimum LLC frame size and the alternate LLC frame size; and a packet former that forms user data into packets of sizes within the calculated MTU size.