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IETF RFC 6285
[ACTIVE]

Unicast-Based Rapid Acquisition of Multicast RTP Sessions

Metadata

Publisher
IETF
Doc Type
Standard
Pages
56
Abstract
When an RTP receiver joins a multicast session, it may need to acquire and parse certain Reference Information before it can process any data sent in the multicast session. Depending on the join time, length of the Reference Information repetition (or appearance) interval, size of the Reference Information, and the application and transport properties, the time lag before an RTP receiver can usefully consume the multicast data, which we refer to as the Acquisition Delay, varies and can be large. This is an undesirable phenomenon for receivers that frequently switch among different multicast sessions, such as video broadcasts. In this document, we describe a method using the existing RTP and RTP Control Protocol (RTCP) machinery that reduces the acquisition delay. In this method, an auxiliary unicast RTP session carrying the Reference Information to the receiver precedes or accompanies the multicast stream. This unicast RTP flow can be transmitted at a faster than natural bitrate to further accelerate the acquisition. The motivating use case for this capability is multicast applications that carry real-time compressed audio and video. However, this method can also be used in other types of multicast applications where the acquisition delay is long enough to be a problem. [STANDARDS-TRACK]
Publication Date
2011-06-01
Status Note
Proposed Standard
DOI
10.17487/RFC6285
Link
https://doi.org/10.17487/RFC6285
Author(s)
Bill Ver Steeg
Ali C. Begen
Tom Van Caenegem
Zeev Vax
Keyword(s)
SSM, Multicast, IPTV, Fast Channel Change
Latest version of IETF RFC 6285

Document Versions — IETF RFC 6285

  • ▶ IETF RFC 6285 (2011-06-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

Bibliographic Reference(s)

  • Westerlund, M., Johansson, I., Perkins, C., O'Hanlon, P., and K. Carlberg, "Explicit Congestion Notification (ECN) for RTP over UDP", Work in Progress, May 2011. EXTERNAL
  • UPnP Forum, "Universal Plug and Play (UPnP) Internet Gateway Device (IGD)", December 2010. EXTERNAL
  • Begen, A. and E. Friedrich, "Multicast Acquisition Report Block Type for RTP Control Protocol (RTCP) Extended Reports (XRs)", Work in Progress, May 2011. EXTERNAL
  • McGrew, D., Andreasen, F., Wing, D., and K. Fischer, "Encrypted Key Transport for Secure RTP", Work in Progress, March 2011. EXTERNAL
  • Begen, A., Glazebrook, N., and W. Ver Steeg, "Reducing Channel Change Times in IPTV with Real-Time Transport Protocol (IEEE Internet Computing)", May 2009. EXTERNAL
  • Begen, A., "Considerations and Guidelines for Deploying the Rapid Acquisition of Multicast Sessions (RAMS) Method", Work in Progress, June 2011. EXTERNAL
  • IETF RFC 768 [Active*]
  • IETF RFC 4787 [Active*]
  • IETF RFC 5226 [Superseded*]
  • IETF RFC 5762 [Active*]
  • IETF RFC 6015 [Active*]
  • IETF RFC 6222 [Superseded*]
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IETF RFC 6285, Unicast-Based Rapid Acquisition of Multicast RTP Sessions. Available at https://doi.org/10.17487/RFC6285
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IETF RFC 6285, Unicast-Based Rapid Acquisition of Multicast RTP Sessions. Available at https://doi.org/10.17487/RFC6285

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IETF RFC 6285, Unicast-Based Rapid Acquisition of Multicast RTP Sessions. Available at https://doi.org/10.17487/RFC6285
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<span class="citation"><cite>IETF RFC 6285</cite>, Unicast-Based Rapid Acquisition of Multicast RTP Sessions. Available at <a href="https://doi.org/10.17487/RFC6285" target="_blank" rel="noopener">https://doi.org/10.17487/RFC6285</a></span>

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IETF RFC 6285, Unicast-Based Rapid Acquisition of Multicast RTP Sessions
doi: 10.17487/RFC6285
url: https://doi.org/10.17487/RFC6285
Snippet:
<li>
<cite id="bib-rfc6285">IETF RFC 6285</cite>, Unicast-Based Rapid Acquisition of Multicast RTP Sessions
<span class="doi">10.17487/RFC6285</span>
</li>

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