Network Working Group R. van Brandenburg
Internet-Draft O. van Deventer
Intended status: Informational TNO
Expires: October 14, 2013 F. Le Faucheur
K. Leung
Cisco Systems
April 12, 2013
Models for adaptive-streaming-aware CDN Interconnection
draft-brandenburg-cdni-has-05
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 October 14, 2013.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
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 . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . 14
3.2.1. General Remarks . . . . . . . . . . . . . . . . . . . 14
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
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