Patent ID: 8730909

Claim:
A method in a wireless communications device having a first protocol stack for use with a first radio access technology including HSDPA and a second protocol stack for use with a second radio access technology where HSDPA is not available, the first protocol stack comprising a reordering component associated with a Medium Access Control (MAC) layer of the first protocol stack and arranged to implement a data reordering queue, wherein the reordering component is a reordering entity comprised by a MAC-hs entity, the method for performing a handover from the first radio access technology including HSDPA to the second radio access technology where HSDPA is not available, the method comprising: determining that the device should perform a handover from the first radio access technology to the second radio access technology; in response to determining that the device should perform a handover and before handover commences: determining that data is present in a reordering queue implemented by the MAC-hs entity; and sending the data present in the reordering queue to a second layer of the first protocol stack which is higher than the MAC layer of the first protocol stack; and thereafter attempting a handover from the first radio access technology to the second radio access technology.