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Point out that the payload size could decrease #3424

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8 changes: 5 additions & 3 deletions draft-ietf-quic-transport.md
Expand Up @@ -3374,9 +3374,11 @@ priorities specified by the application indicate otherwise (see

Even though a sender is encouraged to assemble frames containing up-to-date
information every time it sends a packet, it is not forbidden to retransmit
copies of frames from lost packets. A receiver MUST accept packets containing
an outdated frame, such as a MAX_DATA frame carrying a smaller maximum data than
one found in an older packet.
copies of frames from lost packets. A sender which retransmits copies of frames
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must deal with decreases in available payload size due to change in packet
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number length, connection ID length, and Path MTU. A receiver MUST accept
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packets containing an outdated frame, such as a MAX_DATA frame carrying a
smaller maximum data than one found in an older packet.

Upon detecting losses, a sender MUST take appropriate congestion control action.
The details of loss detection and congestion control are described in
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