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Update draft-ietf-quic-recovery.md
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ianswett committed Nov 30, 2018
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10 changes: 5 additions & 5 deletions draft-ietf-quic-recovery.md
Expand Up @@ -285,11 +285,11 @@ frame. For more information, see Section 13.2 of {{QUIC-TRANSPORT}}.

RTT is calculated when an ACK frame arrives by computing the difference between
the current time and the time the largest acked packet was sent. If the largest
acked is not newly acknowledged or not retransmittable, RTT cannot be calculated.
When RTT is calculated, the ack delay field from the ACK frame SHOULD be
subtracted from the RTT as long as the result is larger than the Min RTT.
If the result is smaller than the min_rtt, the RTT should be used, but the ack
delay field should be ignored.
acked is not newly acknowledged or not retransmittable, RTT cannot be
calculated. When RTT is calculated, the ack delay field from the ACK frame
SHOULD be subtracted from the RTT as long as the result is larger than the
Min RTT. If the result is smaller than the min_rtt, the RTT should be used, but
the ack delay field should be ignored.

Like TCP, QUIC calculates both smoothed RTT and RTT variance similar to those
specified in {{?RFC6298}}.
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