A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated Services
draft-ietf-tsvwg-nqb-00

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Transport Area Working Group                                    G. White
Internet-Draft                                                 CableLabs
Intended status: Standards Track                              T. Fossati
Expires: May 7, 2020                                                 ARM
                                                        November 4, 2019

   A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated
                                Services
                        draft-ietf-tsvwg-nqb-00

Abstract

   This document specifies properties and characteristics of a Non-
   Queue-Building Per-Hop Behavior (NQB PHB).  The purpose of this NQB
   PHB is to provide a separate queue that enables low latency and, when
   possible, low loss for application-limited traffic flows that would
   ordinarily share a queue with capacity-seeking traffic.  The PHB
   provides low latency and, when possible, low loss without
   prioritization and without rate policing, making it suitable for
   environments where the use of either these features may be
   restricted.  The NQB PHB has been developed primarily for use by
   access network segments, where queuing delays and queuing loss caused
   by Queue-Building protocols are manifested, but its use is not
   limited to such segments.  In particular, applications to cable
   broadband links and mobile network radio and core segments are
   discussed.  This document defines a standard Differentiated Services
   Code Point (DSCP) to identify Non-Queue-Building flows.

Status of This Memo

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White & Fossati            Expires May 7, 2020                  [Page 1]
Internet-Draft           Non-Queue-Building PHB            November 2019

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview: Non-Queue Building Flows  . . . . . . . . . . . . .   3
   4.  DSCP Marking of NQB Traffic . . . . . . . . . . . . . . . . .   4
   5.  Non Queue Building PHB Requirements . . . . . . . . . . . . .   5
   6.  Relationship to L4S . . . . . . . . . . . . . . . . . . . . .   6
   7.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  DOCSIS Access Networks  . . . . . . . . . . . . . . . . .   6
     7.2.  Mobile Networks . . . . . . . . . . . . . . . . . . . . .   6
     7.3.  WiFi Networks . . . . . . . . . . . . . . . . . . . . . .   7
   8.  Open Points . . . . . . . . . . . . . . . . . . . . . . . . .   7
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   11. Security Considerations . . . . . . . . . . . . . . . . . . .   8
   12. Informative References  . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   This document defines a Differentiated Services (DS) per-hop behavior
   (PHB) called "Non-Queue-Building Per-Hop Behavior" (NQB PHB), which
   is intended to enable networks to provide low latency and low loss
   for traffic flows that are relatively low data rate and that do not
   themselves materially contribute to queueing delay and loss.  Such
   Non-Queue-Building flows (for example: interactive voice and video,
   gaming, machine to machine applications) are application limited
   flows that are distinguished from traffic flows managed by an end-to-
   end congestion control algorithm.

   The vast majority of packets that are carried by broadband access