TCP Alternative Backoff with ECN (ABE)

Document Type Replaced Internet-Draft (individual)
Authors Naeem Khademi  , Michael Welzl  , Grenville Armitage  , Gorry Fairhurst 
Last updated 2016-10-30
Replaces draft-khademi-alternativebackoff-ecn
Replaced by RFC 8511
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Expired & archived
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IESG IESG state Replaced by draft-ietf-tcpm-alternativebackoff-ecn
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This memo updates the TCP sender-side reaction to a congestion notification received via Explicit Congestion Notification (ECN). The updated method reduces FlightSize in Congestion Avoidance by a smaller amount than the TCP reaction to loss. The intention is to achieve good throughput when the queue at the bottleneck is smaller than the bandwidth-delay-product of the connection. This is more likely when an Active Queue Management (AQM) mechanism has used ECN to CE-mark a packet, than when a packet was lost. Future versions of this document will also describe a corresponding method for SCTP.


Naeem Khademi (
Michael Welzl (
Grenville Armitage (
Gorry Fairhurst (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)