Patent ID: 6798842
Filing Date: 2004-09-28
Classification: H04L

Abstract:
A method for determining a retransmission range of n-bit sized sequence numbers in a wireless communications system, the wireless communications system comprising:a receiver with a receiving window having a receiving window size, the receiving window size indicating the number of sequence numbers spanned by the receiving window; and a transmitter having a state variable VT(S) that holds a sequence number of a protocol data unit (PDU) to be transmitted; the method comprising: obtaining a base value that marks a beginning sequence number of the retransmission range, the base value given by (VT(S)+receiving window size) mod 2n; and obtaining a head value that marks an ending sequence number of the retransmission range, the head value given by VT(S)âˆ’1; wherein PDUs with sequence numbers that are sequentially on or after the base value and that are sequentially on or before the head value are capable of retransmission.