Patent ID: 7480267

Claim:
A method of operating a communication device, the communication device configurable to operate in a mobile communications network, the device operating using a protocol having a physical layer, and at least an RRC (radio resource control) layer and an RLC (radio link control) layer of a UMTS system, wherein the RRC layer is arranged to submit an SDU to the RLC layer for communication using the physical layer, the method comprising: in response to a signal from said RLC layer, said signal being indicative of discard of said SDU: causing said RRC layer to resubmit said SDU to said RLC layer a predetermined number N of times, N being a number greater than zero; and in response to N further signals indicative of said discard, causing said RRC layer to submit to said RLC layer a CELL UPDATE message indicative of an unrecoverable error in said RLC layer for emission in response thereto.