Patent ID: 8831005
Filing Date: 2014-09-09
Classification: H04W

Abstract:
1. A method of processing data units at a receiver, the method comprising: receiving a plurality of data units, of a data stream, having respective sequence numbers; determining, using a reordering window, whether a newly received data unit of the data stream is a new data unit or a repeated data unit at the receiver, wherein the reordering window defines: (i) a first range of sequence numbers relative to the sequence number of a previously received data unit, and (ii) a second range of sequence numbers relative to the sequence number of the previously received data unit, wherein if the sequence number of the newly received data unit falls within the first range then the newly received data unit is determined to be a repeated data unit, and wherein if the sequence number of the newly received data unit falls within the second range then the newly received data unit is determined to be a new data unit; processing the newly received data unit at the receiver based on the determination as to whether the newly received data unit is a new data unit or a repeated data unit; detecting a handover condition; and in response to detecting the handover condition, adjusting the first and second ranges of the reordering window for use during the handover condition.