Patent ID: 8159965
Filing Date: 2012-04-17
Classification: H04L,H04W

Abstract:
1. A method of comparing a state variable or a sequence number corresponding to a packet with modulus arithmetic for a receiving terminal of a wireless communications system, the receiving terminal operating in an unacknowledged mode and supporting a duplicate avoidance and reordering function, hereinafter called DAR function, the method comprising: establishing a DAR entity when the DAR function is initiated; providing a reception buffer for storing packets received by the receiving terminal; the receiving terminal determining a sequence number range of a receiving window and using a minimum sequence number of the receiving window as a modulus base for the modulus arithmetic when the DAR function is configured; and the receiving terminal providing the modulus base for the DAR entity and the reception buffer to use when the DAR function is configured; wherein determining the sequence number range of the receiving window comprises determining the sequence number range of the receiving window according to a window size of the receiving window and a state variable corresponding to a maximum sequence number of the sequence numbers that have been received by the DAR entity.