Diff: rfc9957v3.txt - rfc9957.txt

	rfc9957v3.txt	rfc9957.txt

	Independent Submission B. Briscoe, Ed.	Independent Submission B. Briscoe, Ed.
	Request for Comments: 9957 Independent	Request for Comments: 9957 Independent
	Category: Informational G. White	Category: Informational G. White
	ISSN: 2070-1721 CableLabs	ISSN: 2070-1721 CableLabs
	April 2026	April 2026


	The DOCSIS® Queue Protection Algorithm to Preserve Low Latency	The DOCSIS Queue Protection Algorithm to Preserve Low Latency

	Abstract	Abstract

	This Informational RFC explains the specification of the queue	This Informational RFC explains the specification of the queue
	protection algorithm used in Data-Over-Cable Service Interface	protection algorithm used in Data-Over-Cable Service Interface
	Specification (DOCSIS) technology since version 3.1. A shared low-	Specification (DOCSIS) technology since version 3.1. A shared low-
	latency queue relies on the non-queue-building behaviour of every	latency queue relies on the non-queue-building behaviour of every
	traffic flow using it. However, some flows might not take such care,	traffic flow using it. However, some flows might not take such care,
	either accidentally or maliciously. If a queue is about to exceed a	either accidentally or maliciously. If a queue is about to exceed a
	threshold level of delay, the Queue Protection algorithm can rapidly	threshold level of delay, the Queue Protection algorithm can rapidly

	skipping to change at line 1360 ¶	skipping to change at line 1360 ¶
	<https://github.com/EricssonResearch/scream/blob/master/	<https://github.com/EricssonResearch/scream/blob/master/
	README.md>.	README.md>.

	Acknowledgements	Acknowledgements

	Thanks to Tom Henderson, Magnus Westerlund, David Black, Adrian	Thanks to Tom Henderson, Magnus Westerlund, David Black, Adrian
	Farrel, and Gorry Fairhurst for their reviews of this document. The	Farrel, and Gorry Fairhurst for their reviews of this document. The
	design of the QProt algorithm and the settings of the parameters	design of the QProt algorithm and the settings of the parameters
	benefited from discussion and critique from the participants of the	benefited from discussion and critique from the participants of the
	cable industry working group on Low-Latency DOCSIS. CableLabs funded	cable industry working group on Low-Latency DOCSIS. CableLabs funded

	Bob Briscoe's initial work on this document.	Bob Briscoe's initial work on this document. Parts of this document
		are reproduced from [DOCSIS] with kind permission of Cable Television
		Laboratories, Inc. ("CableLabs").

	Authors' Addresses	Authors' Addresses

	Bob Briscoe (editor)	Bob Briscoe (editor)
	Independent	Independent
	United Kingdom	United Kingdom
	Email: ietf@bobbriscoe.net	Email: ietf@bobbriscoe.net
	URI: https://bobbriscoe.net/	URI: https://bobbriscoe.net/

	Greg White	Greg White

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