DetNet Bounded Latency
draft-finn-detnet-bounded-latency-00

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DetNet                                                           N. Finn
Internet-Draft                               Huawei Technologies Co. Ltd
Intended status: Standards Track                          J-Y. Le Boudec
Expires: September 6, 2018                                          EPFL
                                                                B. Varga
                                                               J. Farkas
                                                                Ericsson
                                                           March 5, 2018

                         DetNet Bounded Latency
                  draft-finn-detnet-bounded-latency-00

Abstract

   This document presents a parameterized timing model for Deterministic
   Networking so that existing and future standards can achieve bounded
   latency and zero congestion loss.

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   This Internet-Draft will expire on September 6, 2018.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Finn, et al.            Expires September 6, 2018               [Page 1]
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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Terminology and Definitions . . . . . . . . . . . . . . . . .   4
   4.  DetNet bounded latency model  . . . . . . . . . . . . . . . .   4
     4.1.  Flow creation . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  End-to-end model  . . . . . . . . . . . . . . . . . . . .   5
     4.3.  Relay system model  . . . . . . . . . . . . . . . . . . .   5
   5.  Computing End-to-end Latency Bounds . . . . . . . . . . . . .   7
     5.1.  Examples of Computations  . . . . . . . . . . . . . . . .   8
   6.  Achieving zero congestion loss  . . . . . . . . . . . . . . .   8
     6.1.  A General Formula . . . . . . . . . . . . . . . . . . . .   8
   7.  Queuing model . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  Queuing data model  . . . . . . . . . . . . . . . . . . .   9
     7.2.  IEEE 802.1 Queuing Model  . . . . . . . . . . . . . . . .  11
       7.2.1.  Queuing Data Model with Preemption  . . . . . . . . .  11
       7.2.2.  Transmission Selection Model  . . . . . . . . . . . .  12
     7.3.  Other queuing models, e.g. IntServ  . . . . . . . . . . .  14
   8.  Parameters for the bounded latency model  . . . . . . . . . .  14
     8.1.  Sender parameters . . . . . . . . . . . . . . . . . . . .  14
     8.2.  Relay system parameters . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   The ability for IETF Deterministic Networking (DetNet) or IEEE 802.1
   Time-Sensitive Networking (TSN) to provide the DetNet services of
   bounded latency and zero congestion loss depends upon A) configuring
   and allocating network resources for the exclusive use of DetNet/TSN
   flows; B) identifying, in the data plane, the resources to be
   utilized by any given packet, and C) the detailed behavior of those
   resources, especially transmission queue selection, so that latency
   bounds can be reliably assured.  Thus, DetNet is an example of an
   INTSERV Guaranteed Quality of Service [RFC2212]

   As explained in [I-D.ietf-detnet-architecture], DetNet flows are
   characterized by 1) a maximum bandwidth, guaranteed either by the
   transmitter or by strict input metering; and 2) a requirement for a
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