A New Internet-Draft is available from the on-line Internet-Drafts
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Title : A new TLV RAMS-I element for RAMS
Author(s) : Z. Zou, Y. Wang
Filename : draft-zou-avt-new-tlv-element-rams-00.txt
Pages : 6
Date : 2009-11-24
[I-D.ietf-avt-rapid-acquisition-for-rtp] defines a method for rapid
acquisition of multicast sessions (RAMS). Upon accepting the first
RAMS-R message, RS MUST echo an RAMS-I message as a response to RR.
This document proposes to optionally convey a parameter called
unicast backspace in the RAMS-I message. Unicast backspace is the
RTP timestamp difference between the first unicast burst packet to be
sent and the latest primary multicast packet in the buffer of RS.
The RTP timestamps values for these packets are taken from the
primary multicast stream. The parameter is a constant once RS
chooses a starting point for the unicast burst. This parameter can
be used by RR to determine when to join the primary multicast session.
RR would not rely on RAMS-I to revise the earliest multicast join
time after the burst rate is changed by RS and therefore is immune to
the lose of RAMS-I. Moreover, if this parameter is known, RR with
appropriate playback control can reduce the additional end-to-end
delay introduced by the RAMS process or can enable the RS to serve
the RR with shorter burst duration and therefore save the bandwidth
of RS export and the burst forwarding path.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-zou-avt-new-tlv-element-rams-00.txt
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