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Requirements for Internet Media Guides (IMGs)
RFC 4473

Document type: RFC - Informational (May 2006; No errata)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4473 (Informational)
Responsible AD: Jon Peterson
Send notices to: jo@acm.org, csp@csperkins.org

Network Working Group                                          Y. Nomura
Request for Comments: 4473                                  Fujitsu Labs
Category: Informational                                         R. Walsh
                                                              J-P. Luoma
                                                                   Nokia
                                                                  J. Ott
                                       Helsinki University of Technology
                                                          H. Schulzrinne
                                                     Columbia University
                                                                May 2006

             Requirements for Internet Media Guides (IMGs)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This memo specifies requirements for a framework and protocols for
   accessing and updating Internet Media Guide (IMG) information for
   media-on-demand and multicast applications.  These requirements are
   designed to guide choice and development of IMG protocols for
   efficient and scalable delivery.

Nomura, et al.               Informational                      [Page 1]
RFC 4473     Requirements for Internet Media Guides (IMGs)      May 2006

Table of Contents

   1. Introduction ....................................................3
      1.1. Background and Motivation ..................................3
      1.2. Scope of This Document .....................................4
   2. Terminology .....................................................5
      2.1. New Terms ..................................................5
   3. Problem Statement ...............................................6
   4. Use Cases Requiring IMGs ........................................7
      4.1. Connectivity-based Use Cases ...............................7
           4.1.1. IP Datacast to a Wireless Receiver ..................7
           4.1.2. Regular Fixed Dial-up Internet Connection ...........8
           4.1.3. Broadband Always-on Fixed Internet Connection .......9
      4.2. Content-orientated Use Cases ...............................9
           4.2.1. TV and Radio Program Delivery .......................9
           4.2.2. Media Coverage of a Live Event .....................10
           4.2.3. Distance Learning ..................................10
           4.2.4. Multiplayer Gaming .................................10
           4.2.5. File Distribution ..................................11
           4.2.6. Coming-release and Pre-released Content ............11
   5. Requirements ...................................................11
      5.1. General Requirements ......................................11
           5.1.1. Independence of IMG Operations from IMG Metadata ...11
           5.1.2. Multiple IMG Senders ...............................12
           5.1.3. Modularity .........................................12
      5.2. Delivery Properties .......................................12
           5.2.1. Scalability ........................................13
           5.2.2. Support for Intermittent Connectivity ..............13
           5.2.3. Congestion Control .................................13
           5.2.4. Sender- and Receiver-Driven Delivery ...............13
      5.3. Customized IMGs ...........................................14
      5.4. Reliability ...............................................15
           5.4.1. Managing Consistency ...............................15
           5.4.2. Reliable Message Exchange ..........................16
      5.5. IMG Descriptions ..........................................16
   6. Security Considerations ........................................17
      6.1. IMG Authentication and Integrity ..........................18
      6.2. Privacy ...................................................19
      6.3. Access Control for IMGs ...................................19
      6.4. Denial-of-Service (DOS) Attacks ...........................20
      6.5. Replay Attacks ............................................20
   7. Normative References ...........................................21
   8. Informative References .........................................21
   9. Acknowledgements ...............................................22

Nomura, et al.               Informational                      [Page 2]
RFC 4473     Requirements for Internet Media Guides (IMGs)      May 2006

1.  Introduction

1.1.  Background and Motivation

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