Reliable and Available Wireless Problem Statement
draft-pthubert-raw-problem-statement-03

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RAW                                                      P. Thubert, Ed.
Internet-Draft                                             Cisco Systems
Intended status: Informational                         G.Z. Papadopoulos
Expires: 10 April 2020                                    IMT Atlantique
                                                          8 October 2019

           Reliable and Available Wireless Problem Statement
                draft-pthubert-raw-problem-statement-03

Abstract

   Due to uncontrolled interferences, including the self-induced
   multipath fading, deterministic networking can only be approached on
   wireless links.  The radio conditions may change -way- faster than a
   centralized routing can adapt and reprogram, in particular when the
   controller is distant and connectivity is slow and limited.  RAW
   separates the routing time scale at which a complex path is
   recomputed from the forwarding time scale at which the forwarding
   decision is taken for an individual packet.  RAW operates at the
   forwarded time scale.  The RAW problem is to decide, within the
   redundant solutions that are proposed by the routing, which will be
   used for each individual packet to provide a DetNet service while
   minimizing the waste of resources.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Thubert & Papadopoulos    Expires 10 April 2020                 [Page 1]
Internet-Draft                   RAW PS                     October 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Use Cases and Requirements Served . . . . . . . . . . . . . .   4
   3.  Routing Scale vs. Forwarding Scale  . . . . . . . . . . . . .   4
   4.  Prerequisites . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Related Work at The IETF  . . . . . . . . . . . . . . . . . .   5
   6.  Functional Gaps . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Bringing determinism in a packet network means eliminating the
   statistical effects of multiplexing that result in probabilistic
   jitter and loss.  This can be approached with a tight control of the
   physical resources to maintain the amount of traffic within a
   budgetted volume of data per unit of time that fits the physical
   capabilities of the underlying technology, and the use of time-shared
   resources (bandwidth and buffers) per circuit, and/or by shaping and/
   or scheduling the packets at every hop.

   Wireless networks operate on a shared medium where uncontrolled
   interference, including the self-induced multipath fading, adds
   another dimension to the statistical effects that affect the
   delivery.  Scheduling transmissions can alleviate those effects by
   leveraging diversity in the spatial, time, code, and frequency
   domains, and provide a Reliable and Available service while
   preserving energy and optimizing the use of the shared spectrum.

   Deterministic Networking is an attempt to mostly eliminate packet
   loss for a committed bandwidth with a guaranteed worst-case end-to-
   end latency, even when co-existing with best-effort traffic in a
   shared network.  This innovation is enabled by recent developments in
   technologies including IEEE 802.1 TSN (for Ethernet LANs) and IETF
   DetNet (for wired IP networks).  It is getting traction in various
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