Multicast Wifi Problem Statement
draft-mcbride-mboned-wifi-mcast-problem-statement-01

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MBONED WG                                                     M. McBride
Internet-Draft                                                C. Perkins
Intended status: Standards Track                                  Huawei
Expires: April 29, 2018                                 October 26, 2017

                    Multicast Wifi Problem Statement
          draft-mcbride-mboned-wifi-mcast-problem-statement-01

Abstract

   There have been known issues with multicast, in an 802.11
   environment, which have prevented the deployment of multicast in
   these wifi environments.  IETF multicast experts have been meeting
   together to discuss these issues and provide IEEE updates.  The
   mboned working group is chartered to receive regular reports on the
   current state of the deployment of multicast technology, create
   "practice and experience" documents that capture the experience of
   those who have deployed and are deploying various multicast
   technologies, and provide feedback to other relevant working groups.
   As such, this document will gather the problems of wifi multicast
   into one problem statement document so as to offer the community
   guidance on current limitations.

Status of This Memo

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   This Internet-Draft will expire on April 29, 2018.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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McBride & Perkins        Expires April 29, 2018                 [Page 1]
Internet-Draft      Multicast Wifi Problem Statement        October 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Multicast over WiFi Problems  . . . . . . . . . . . . . . . .   2
     2.1.  Low Reliability . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Low Data Rate . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  High Interference . . . . . . . . . . . . . . . . . . . .   4
     2.4.  High Power Consumption  . . . . . . . . . . . . . . . . .   4
   3.  Common remedies to multicast over wifi problems . . . . . . .   4
   4.  State of the Union  . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Multicast over wifi has been used to low levels of success, usually
   to a point of being so negative that multicast over wifi is not
   allowed.  In addition to protocol use of broadcast/multicast for
   control messages, more applications, such as push to talk in
   hospitals, video in enterprises and lectures in Universities, are
   streaming over wifi.  And many end devices are increasingly using
   wifi for their connectivity.  One of the primary problems multicast
   over wifi faces is that link local 802.11 doesn't necessarily support
   multicast, it supports broadcast.  To make make multicast over wifi
   work successfully we often need to modify the multicast to instead be
   sent as unicast in order for it to successfully transmit with useable
   quality.  Multicast over wifi experiences high packet error rates, no
   acknowledgements, and low data rate.  This draft reviews these
   problems found with multicast over wifi.  While this is not a
   solutions draft, common workarounds to some of the problems will be
   listed, along with the impact of the workarounds.

2.  Multicast over WiFi Problems

   802.11 is a wireless broadcast medium which works well for unicast
   and has become ubiquitous in its use.  With multicast, however,
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