Models for adaptive-streaming-aware CDN Interconnection
draft-brandenburg-cdni-has-03

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CDNI                                                  R. van Brandenburg
Internet-Draft                                           O. van Deventer
Intended status: Informational                                       TNO
Expires: January 13, 2013                                 F. Le Faucheur
                                                                K. Leung
                                                           Cisco Systems
                                                           July 12, 2012

        Models for adaptive-streaming-aware CDN Interconnection
                     draft-brandenburg-cdni-has-03

Abstract

   This documents presents thoughts on the potential impact of
   supporting HTTP Adaptive Streaming technologies in CDN
   Interconnection scenarios.  Our intent is to spur discussion on how
   the different CDNI interfaces could, and should, deal with content
   delivered using adaptive streaming technologies and to facilitate
   working group decisions.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 13, 2013.

Copyright Notice

   Copyright (c) 2012 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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van Brandenburg, et al.  Expires January 13, 2013               [Page 1]
Internet-Draft      HTTP Adaptive streaming and CDNI           July 2012

   to this document.  Code Components extracted from this document must
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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  . . . . . . . . . . . .  5
     2.2.  Addressing chunks  . . . . . . . . . . . . . . . . . . . .  6
       2.2.1.  Relative URLs  . . . . . . . . . . . . . . . . . . . .  8
       2.2.2.  Absolute URLs with Redirection . . . . . . . . . . . .  8
       2.2.3.  Absolute URL without Redirection . . . . . . . . . . .  9
     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 . . . . . . . . . . . . . . . . . 12
         3.1.2.1.  Option 1.1: No HAS awareness . . . . . . . . . . . 12
         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 . . . . . . . . . . . . . . . . . . . . 14
     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 . . . . . . . . . . . . . . . . . . . . 16
     3.3.  Request Routing of HAS content . . . . . . . . . . . . . . 17
       3.3.1.  General remarks  . . . . . . . . . . . . . . . . . . . 17
       3.3.2.  Candidate approaches . . . . . . . . . . . . . . . . . 17
         3.3.2.1.  Option 3.1: No HAS awareness . . . . . . . . . . . 17
         3.3.2.2.  Option 3.2: Manifest File rewriting by uCDN  . . . 19
         3.3.2.3.  Option 3.3: Two-step Manifest File rewriting . . . 20
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