Re: [rtcweb] Comments on draft-ietf-rtcweb-use-cases-and-requirements-07

[Cullen Jennings <[e-mail]>]

On May 30, 2012, at 5:06 , Göran Eriksson AP wrote:

>> 
>> -----Original Message-----
>> From: [e-mail] 
>> [mailto:[e-mail]] On Behalf Of Cullen Jennings
>> Sent: den 16 maj 2012 03:31
>> To: [e-mail]
>> Subject: [rtcweb] Comments on 
>> draft-ietf-rtcweb-use-cases-and-requirements-07
>> 
>> 
>> Like to add case where application has one two video streams 
>> but one is far more important than the other. Should be a way 
>> to make sure that preferential treatment is given the the 
>> important stream over the less important streams. 
> 
> I agree that this is a relevant area to address to secure that WebRTC is competitive compared to
> apps done in native OS's, especiallin in enterprise context.
> 
> The current use case document states something like "being able to use priority functions in network nodes".
> This is vague since it touches many matters such as whether to put audio and video on the same IP-flow or have them in different
> ones, which is essential when considering mapping on LTE radio channels; the potential use of DS to identify flows, which
> may be relevant in enterprise context, etc, how to cater for treament of stuff on the datagram channel, multihoming consequences, etc.
> 
> I am not sure however how far into such matters we should go in this WG, but given the importance of making a
> good solution working across OS's and browser vendors and access technologies, I am leaning towards support a discussions about such
> details in this WG for instance using the use case document.
> 
> What is Your take of this? 

I think we need to discuss it in the spec. Let's imagine the case where we want the brows to set one DSCP for audio and a different one for video. I don't think we can have setting the DSCP 100% under control of the JS App as that has security problems. But the browser should set the DSCP to something and if there are multiple video streams, I think it is important to be able to indicate some video streams are less important than others - only the JS app knows which one is less important.