From: Juliusz Chroboczek <jch@irif.fr>
To: T H Panton <tim@pi.pe>
Cc: galene@lists.galene.org
Subject: [Galene] Re: using up more ports in ipv6 for better congestion control
Date: Fri, 16 Jul 2021 19:48:08 +0200 [thread overview]
Message-ID: <87zgumkv53.wl-jch@irif.fr> (raw)
In-Reply-To: <0AA86EE7-3FFA-4764-A0B2-A6C18A6A231E@pi.pe>
> I don’t think it could. - isn't REMB based on watching the packet
> arrival interval
No, it acts on the derivative of the packet arrival *delay*.
Recall that every RTP packet is timestamped at the sender (that's the
Timestamp field of the RTP header). When the receiver receives a packet
with timestamp t, it computes a local timestamp u. When it receives
a second packet with remote timestamp t' and local timestamp u', it
computes
(u' - t') - (u - t)
which is the variation of the packet delay. Note that this formula is
equivalent to
(u' - u) - (t' - t)
which shows that the offsets between the local and remote clocks cancel
out, so the clocks don't need to be synchronised.
-- Juliusz
prev parent reply other threads:[~2021-07-16 17:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-10 15:15 [Galene] " Dave Taht
2021-07-10 15:19 ` [Galene] " Dave Taht
2021-07-10 16:36 ` T H Panton
2021-07-10 16:48 ` Dave Taht
2021-07-11 11:19 ` Juliusz Chroboczek
2021-07-15 14:17 ` Sean DuBois
2021-07-16 1:36 ` Juliusz Chroboczek
2021-07-16 14:25 ` Sean DuBois
2021-07-15 16:26 ` T H Panton
2021-07-16 1:37 ` Juliusz Chroboczek
2021-07-16 14:46 ` T H Panton
2021-07-16 17:48 ` Juliusz Chroboczek [this message]
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