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Re: [rtcweb] RTP Usage: Is RTP Retransmission REQUIRED or RECOMMENDED

Bernard Aboba <bernard_aboba@hotmail.com> Wed, 27 June 2012 14:34 UTC

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Subject: Re: [rtcweb] RTP Usage: Is RTP Retransmission REQUIRED or RECOMMENDED
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Fabio said: 

> If you use RTP over a Mobile Networks subject to strong packet loss
> (especially 3G or area plenty of many mobile devices), the RTP
> retransmission became a requirement.

[BA] The usefulness of retransmission will depend on the RTT.  There are quite a few
mobile networks that suffer from buffer bloat to the point where retransmission is quite useless. 
Also, retransmission (and FEC) both increase bandwidth usage which is a problem for congestion 
control.

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