Models for adaptive-streaming-aware CDN Interconnection
draft-brandenburg-cdni-has-04

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Network Working Group                                 R. van Brandenburg
Internet-Draft                                           O. van Deventer
Intended status: Informational                                       TNO
Expires: July 12, 2013                                    F. Le Faucheur
                                                                K. Leung
                                                           Cisco Systems
                                                         January 8, 2013

        Models for adaptive-streaming-aware CDN Interconnection
                     draft-brandenburg-cdni-has-04

Abstract

   This documents presents thoughts on the potential impact of
   supporting HTTP Adaptive Streaming technologies in CDN
   Interconnection (CDNI) scenarios.  The intent is to present the
   authors' analysis of the CDNI-HAS problem space and discuss different
   options put forward both by the authors (and by others during
   informal discussions) on how to deal with HAS in the context of CDNI.
   THis document has been used as input information during the WG
   process for making its decision regarding support for HAS.

Status of this Memo

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   This Internet-Draft will expire on July 12, 2013.

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   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

van Brandenburg, et al.   Expires July 12, 2013                 [Page 1]
Internet-Draft      HTTP Adaptive streaming and CDNI        January 2013

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  HTTP Adaptive Streaming aspects relevant to CDNI . . . . . . .  5
     2.1.  Segmentation versus Fragmentation  . . . . . . . . . . . .  6
     2.2.  Addressing chunks  . . . . . . . . . . . . . . . . . . . .  7
       2.2.1.  Relative URLs  . . . . . . . . . . . . . . . . . . . .  8
       2.2.2.  Absolute URLs with Redirection . . . . . . . . . . . .  9
       2.2.3.  Absolute URL without Redirection . . . . . . . . . . . 10
     2.3.  Live vs. VoD . . . . . . . . . . . . . . . . . . . . . . . 10
     2.4.  Stream splicing  . . . . . . . . . . . . . . . . . . . . . 11
   3.  Possible HAS Optimizations . . . . . . . . . . . . . . . . . . 11
     3.1.  File Management and Content Collections  . . . . . . . . . 12
       3.1.1.  General Remarks  . . . . . . . . . . . . . . . . . . . 12
       3.1.2.  Candidate approaches . . . . . . . . . . . . . . . . . 13
         3.1.2.1.  Option 1.1: No HAS awareness . . . . . . . . . . . 13
         3.1.2.2.  Option 1.2: Allow single file storage of
                   fragmented content . . . . . . . . . . . . . . . . 13
         3.1.2.3.  Option 1.3: Access correlation hint  . . . . . . . 14
       3.1.3.  Recommendation . . . . . . . . . . . . . . . . . . . . 15
     3.2.  Content Acquisition of Content Collections . . . . . . . . 15
       3.2.1.  General Remarks  . . . . . . . . . . . . . . . . . . . 15
       3.2.2.  Candidate Approaches . . . . . . . . . . . . . . . . . 15
         3.2.2.1.  Option 2.1: No HAS awareness . . . . . . . . . . . 15
         3.2.2.2.  Option 2.2: Allow single file acquisition of
                   fragmented content . . . . . . . . . . . . . . . . 16
       3.2.3.  Recommendation . . . . . . . . . . . . . . . . . . . . 17
     3.3.  Request Routing of HAS content . . . . . . . . . . . . . . 17
       3.3.1.  General remarks  . . . . . . . . . . . . . . . . . . . 17
       3.3.2.  Candidate approaches . . . . . . . . . . . . . . . . . 17
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