Avoiding stall conditions and sequence number ambiguity in an automatic repeat request protocol
Patent 7187677 Issued on March 6, 2007. Estimated Expiration Date: 
May 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLimited automatic repeat request protocol for frame-based communication channels Method and apparatus for discarding packets in a data network having automatic repeat request Apparatus and method for exchanging variable-length data according to a radio link protocol in a mobile communication system Quality of service extensions for multimedia applications in wireless computer networks Patent #: 6934752 InventorsAssigneeApplicationNo. 10152986 filed on 05/23/2002US Classes:370/394, Sequencing or resequencing of packets to insure proper output sequence order370/469, Processing multiple layer protocols370/236, Including signaling between network elements370/474, Assembly or disassembly of messages having address headers709/225, Computer network access regulating714/801, Parity generator or checker circuit detail375/222, Modems (data sets)709/227, COMPUTER-TO-COMPUTER SESSION/CONNECTION ESTABLISHING370/335Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA)ExaminersPrimary: Ho, DucAttorney, Agent or FirmForeign Patent References
International ClassH04L 12/56AbstractThe present invention provides a stall avoidance mechanism that may be used alone or in conjunction with an ambiguity avoidance mechanism in an ARQ protocol. Both mechanisms decrease data delays and increase data throughput rates. Stall avoidance is accomplished by determining whether a stall condition exists with respect to receiving a missing data unit. In one example, only a single timer is needed to avoid stalls. Retransmission ambiguities may be avoided using a retransmission window in the transmitter and/or a receive window in the receiver. Although each mechanism may be used independently of the other, a preferred example embodiment uses a stall avoidance timer, a retransmission window in the transmitter, and a receive window in the receiver.Other References
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