Considerations for Deploying the Rapid Acquisition of Multicast RTP Sessions (RAMS) Method
draft-ietf-avtext-rams-scenarios-04
The information below is for an old version of the document | |||
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Document | Type | Active Internet-Draft (avtext WG) | |
Author | Ali Begen | ||
Last updated | 2012-04-23 (latest revision 2012-04-18) | ||
Replaces | draft-begen-avtext-rams-scenarios | ||
Stream | IETF | ||
Intended RFC status | Informational | ||
Formats | pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Keith Drage | ||
IESG | IESG state | IESG Evaluation | |
Consensus Boilerplate | Unknown | ||
Telechat date |
Needs a YES. |
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Responsible AD | Gonzalo Camarillo | ||
IESG note | Keith Drage (keith.drage@alcatel-lucent.com) is the document shepherd. | ||
Send notices to | avtext-chairs@tools.ietf.org, draft-ietf-avtext-rams-scenarios@tools.ietf.org |
AVTEXT A. Begen Internet-Draft Cisco Intended status: Informational April 18, 2012 Expires: October 20, 2012 Considerations for Deploying the Rapid Acquisition of Multicast RTP Sessions (RAMS) Method draft-ietf-avtext-rams-scenarios-04 Abstract The Rapid Acquisition of Multicast RTP Sessions (RAMS) solution is a method based on RTP and RTP Control Protocol (RTCP) that enables an RTP receiver to rapidly acquire and start consuming the RTP multicast data. Upon a request from the RTP receiver, an auxiliary unicast RTP retransmission session is set up between a retransmission server and the RTP receiver, over which the reference information about the new multicast stream the RTP receiver is about to join is transmitted at an accelerated rate. This often precedes, but may also accompany, the multicast stream itself. When there is only one multicast stream to be acquired, the RAMS solution works in a straightforward manner. However, when there are two or more multicast streams to be acquired from the same or different multicast RTP sessions, care should be taken to configure each RAMS session appropriately. This document provides example scenarios and discusses how the RAMS solution could be used in such scenarios. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on October 20, 2012. Copyright Notice Copyright (c) 2012 IETF Trust and the persons identified as the Begen Expires October 20, 2012 [Page 1] Internet-Draft RAMS Considerations April 2012 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 publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Example Scenarios . . . . . . . . . . . . . . . . . . . . . . 4 3.1. Scenario #1: Two Multicast Groups . . . . . . . . . . . . 4 3.2. Scenario #2: One Multicast Group . . . . . . . . . . . . . 5 3.3. Scenario #3: SSRC Multiplexing . . . . . . . . . . . . . . 6 3.4. Scenario #4: Payload-Type Multiplexing . . . . . . . . . . 7 4. Feedback Target and SSRC Signaling Issues . . . . . . . . . . 7 5. FEC during RAMS and Bandwidth Issues . . . . . . . . . . . . . 7 5.1. Scenario #1 . . . . . . . . . . . . . . . . . . . . . . . 8 5.2. Scenario #2 . . . . . . . . . . . . . . . . . . . . . . . 9 5.3. Scenario #3 . . . . . . . . . . . . . . . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9.1. Normative References . . . . . . . . . . . . . . . . . . . 11 9.2. Informative References . . . . . . . . . . . . . . . . . . 11 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12 Begen Expires October 20, 2012 [Page 2] Internet-Draft RAMS Considerations April 2012 1. Introduction The Rapid Acquisition of Multicast RTP Sessions (RAMS) solution is a method based on RTP and RTP Control Protocol (RTCP) that enables an RTP receiver to rapidly acquire and start consuming the RTP multicast data. Through an auxiliary unicast RTP retransmission session [RFC4588], the RTP receiver receives a reference information about the new multicast stream it is about to join. This often precedes,Show full document text