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RFC 9959
Title: Careful Resume: Convergence of Congestion
Control from Retained State
Author: N. Kuhn,
E. Stephan,
G. Fairhurst,
R. Secchi,
C. Huitema
Status: Standards Track
Stream: IETF
Date: May 2026
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 29
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-tsvwg-careful-resume-24.txt
URL: https://www.rfc-editor.org/info/rfc9959
DOI: 10.17487/RFC9959
This document specifies a cautious method for Internet transports
that enables fast startup of Congestion Control (CC) for a wide range
of connections, known as "Careful Resume". It reuses a set of
computed CC parameters that are based on previously observed path
characteristics between the same pair of transport endpoints. These
parameters are saved, allowing them to be later used to modify the CC
behaviour of a subsequent connection.
This document describes the assumptions and defines the requirements
for how a sender utilises these parameters to provide opportunities
for a connection to more rapidly get up to speed and utilise
available capacity. It discusses how the use of this method impacts
the capacity at a shared network bottleneck and the safe response
that is needed after any indication that the new rate is
inappropriate.
This document is a product of the Transport and Services Working Group Working
Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
memo is unlimited.
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