Considerations for Deploying the Rapid Acquisition of Multicast RTP Sessions (RAMS) Method
draft-ietf-avtext-rams-scenarios-04
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|---|---|---|---|
| Document | Type | Active Internet-Draft (avtext WG) | |
| 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 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
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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
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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
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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,
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