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An Enhanced Selective ARQ Protocol to Increase System Throughput: Polling for Acknowledgement with the Transmission of the Last Negatively Acknowledged Packet in the Transmit Window Disclosure Number: IPCOM000005069D
Original Publication Date: 2001-Aug-14
Included in the Prior Art Database: 2001-Aug-14

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Walter Featherstone Davood Molkdar


In systems employing automatic repeat request (ARQ) the receiver (Rx-end) is periodically polled for an Ack/Nack (acknowledgement / negative acknowledgement) message. The Ack/Nack message generated by the Rx-end contains the state of the previously received packets. In addition to the periodic polling, it is also customary to poll with the transmission of the last new packet, i.e. the last previously un-transmitted packet. However, currently there is no provision for polling the Rx-end with the last transmitted Nacked packet. This paper proposes to poll for acknowledgement with the last negatively acknowledged block in addition to polling with the last new block. The advantages of the approach are demonstrated through simulation results.