ARQ system with status and packet acknowledgement
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United States of America Patent
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Dec 26, 2017
Grant Date -
Jul 2, 2015
app pub date -
Mar 16, 2015
filing date -
Aug 13, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A communication system comprises a downlink indicator channel for the transmission of an indicator signal indicating that a data packet is scheduled to be transmitted on a downlink data channel from a primary station to a secondary station. In operation, on detection of the indicator signal, the secondary station transmits a status signal, for example a negative acknowledgement signal, on an uplink channel to the primary station immediately before transmission of a positive or negative acknowledgement signal to indicate the status of the received data packet. By providing the primary station with two chances to detect the case where the secondary station fails to detect the indicator signal, peak power requirements of the uplink channel can be reduced, thereby reducing system interference levels.
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