rfc9959v3.txt		rfc9959.txt
	Internet Engineering Task Force (IETF) N. Kuhn		Internet Engineering Task Force (IETF) N. Kuhn
	Request for Comments: 9959 Thales Alenia Space		Request for Comments: 9959 Thales Alenia Space
	Category: Standards Track E. Stephan		Category: Standards Track E. Stephan
	ISSN: 2070-1721 Orange		ISSN: 2070-1721 Orange
	G. Fairhurst		G. Fairhurst
	R. Secchi		R. Secchi
	University of Aberdeen		University of Aberdeen
	C. Huitema		C. Huitema
	Private Octopus Inc.		Private Octopus Inc.
	April 2026		May 2026
	Careful Resume: Convergence of Congestion Control from Retained State		Careful Resume: Convergence of Congestion Control from Retained State
	Abstract		Abstract
	This document specifies a cautious method for Internet transports		This document specifies a cautious method for Internet transports
	that enables fast startup of Congestion Control (CC) for a wide range		that enables fast startup of Congestion Control (CC) for a wide range
	of connections, known as "Careful Resume". It reuses a set of		of connections, known as "Careful Resume". It reuses a set of
	computed CC parameters that are based on previously observed path		computed CC parameters that are based on previously observed path
	characteristics between the same pair of transport endpoints. These		characteristics between the same pair of transport endpoints. These
	skipping to change at line 1157 ¶		skipping to change at line 1157 ¶
	[RFC8085] Eggert, L., Fairhurst, G., and G. Shepherd, "UDP Usage		[RFC8085] Eggert, L., Fairhurst, G., and G. Shepherd, "UDP Usage
	Guidelines", BCP 145, RFC 8085, DOI 10.17487/RFC8085,		Guidelines", BCP 145, RFC 8085, DOI 10.17487/RFC8085,
	March 2017, <https://www.rfc-editor.org/info/rfc8085>.		March 2017, <https://www.rfc-editor.org/info/rfc8085>.
	[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC		[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
	2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,		2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
	May 2017, <https://www.rfc-editor.org/info/rfc8174>.		May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	8.2. Informative References		8.2. Informative References
	[BBR-CC] Cardwell, N., Ed., Swett, I., Ed., and J. Beshay, Ed.,		[BBR-CC] Cardwell, N., Swett, I., and J. Beshay, "BBR Congestion
	"BBR Congestion Control", Work in Progress, Internet-		Control", Work in Progress, Internet-Draft, draft-ietf-
	Draft, draft-ietf-ccwg-bbr-04, 20 October 2025,		ccwg-bbr-05, 2 March 2026,
	<https://datatracker.ietf.org/doc/html/draft-ietf-ccwg-		<https://datatracker.ietf.org/doc/html/draft-ietf-ccwg-
	bbr-04>.		bbr-05>.
	[CONEXT15] Li, Q., Dong, M., and P. B. Godfrey, "Halfback: Running		[CONEXT15] Li, Q., Dong, M., and P. B. Godfrey, "Halfback: Running
	Short Flows Quickly and Safely", CoNEXT '15: Proceedings		Short Flows Quickly and Safely", CoNEXT '15: Proceedings
	of the 11th ACM Conference on Emerging Networking		of the 11th ACM Conference on Emerging Networking
	Experiments and Technologies, DOI 10.1145/2716281.2836107,		Experiments and Technologies, DOI 10.1145/2716281.2836107,
	2015, <https://doi.org/10.1145/2716281.2836107>.		2015, <https://doi.org/10.1145/2716281.2836107>.
	[CR25] Yanev, M., Custura, A., Secchi, R., and G. Fairhurst,		[CR25] Yanev, M., Custura, A., Secchi, R., and G. Fairhurst,
	"Analysis of Careful Resumption of Internet Congestion		"Analysis of Careful Resumption of Internet Congestion
	Control from Retained Path State", Computer Networks, vol.		Control from Retained Path State", Computer Networks, vol.
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