Quasisynchronous reservation requests
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United States of America Patent
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-
May 31, 2011
Grant Date -
Dec 11, 2008
app pub date -
Jun 6, 2008
filing date -
Jun 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatuses are presented for communicating using a shared communication medium. A request is sent in a request signal space where the request represents a code sequence that is a member of a set of code sequences. Each member is characterized by an autocorrelation function that has a peak centered at zero time offset. Each member is further characterized by a cross correlation function. The cross correlation function has a low correlation window having a width and surrounding a zero time offset. An assignment is received that assigns the request to a transmission opportunity in a scheduled transmission signal space. The assignment is made in response to detecting the code sequence from receiving multiple requests having relative timing offsets less than the width of the low correlation window. A data transmission is sent using the assigned transmission opportunity in the scheduled transmission signal space.
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