[Iccrg] FW: [dccp] Sending packets out of schedule?

[Christian Hoene]

Hi,

I ask the following questions today at the DCCP mailing list but maybe ICCRG is a good place to ask those questions, too?

With best regards,

 Christian


> Christian Hoene wrote on 2010-10-28:
>> Hello,
>> 
>> may I ask a simply question? Is it possible to send DCCP packets at
>> other times than those calculated by the rate control? I mean, is it
>> possible to call a send socket call with an option saying, send this
>> packet immediately no matter that the rate control is saying to you?
>> 
>> The role of DCCP would be to calculate the proposed sending rate and to
>> measure the network round trip time. This data is then used by an
>> application specific rate control.
>> 
>> The background of my questions is based on the experience, that real-
>> time packets shall be send immediately, especially if a scenario of
>> very interactivity is given, and that some codecs cannot change their
>> sending rate immediately but need some extra time (e.g. one or two
>> additional frame periods). Thus, a less strict sending schedule would
>> help.
>> 
> I forgot one question. DCCP only allows sending rates of 10ms but we
> need 2ms to support distribute ensemble performances over the
> Internet, which require an acoustic end-to-end of about 25 ms. Is this
> a problem?

>> Thanks for any help and comments.
>> 
>> With best regards,
>>  Christian
>> 

-----Original Message-----
From: Ingemar Johansson S [mailto:ingemar.s.johansson at ericsson.com]
Sent: Thursday, October 28, 2010 11:34 AM
To: Christian Hoene; dccp at ietf.org
Subject: RE: [dccp] Sending packets out of schedule?

Hi Christian

I you may want to look at the iccrg archive for a discussion on the issues with too high packet rate. I posted some very similar questions ~a month ago http://oakham.cs.ucl.ac.uk/pipermail/iccrg/2010-September/000847.html

Regards
/Ingemar