Detecting change in a transport protocol window size without data transmission
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United States of America Patent
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Nov 3, 2009
Grant Date -
Nov 30, 2006
app pub date -
May 19, 2005
filing date -
May 19, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A method detects a change in TCP receive window size while preventing fragmentation of data. A TCP stack receives a segment that advertises a receive window size of zero. If data needs to be sent, and only if so, a timer is started. When the timer expires, a TCP segment that contains a first sequence number value equal to second sequence number representing sent but unacknowledged data minus one, and a segment length value of zero, is sent. Without sending a fragment of data, this triggers a peer TCP process to send an updated window size. A TCP ACK segment is received and contains an updated receive window size. If the updated receive window size is greater than a specified value, then the data is sent. Otherwise, a counter is incremented, and the steps are re-performed if the counter is less than a specified value.
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