Re: [rtcweb] Non-media data service consensus and requirements

[Dzonatas Sol <[e-mail]>]

Please consider something like "augmented waypoints" for evacuation 
systems (might help resolve stampedes).

On 06/28/2011 12:45 PM, Jonathan Rosenberg wrote:
> Here are some thoughts on additional use cases:
>
> * information on congestion and receiver side environment for purposes 
> of improved sender rate adaptation
>
> * active speaker indications
>
> * real-time text (along the lines of 
> http://datatracker.ietf.org/doc/rfc5194/)
>
> * video controls - application driven intra-frame requests, for example
>
> * floor control requests/grants
>
>
> All of these share the common property of being latency sensitive, and 
> thus more appropraite for p2p vs. server mediated. The other driver 
> for p2p data transport is cost reduction, to avoid the need for server 
> mediation for transfer of data. File transfer is the main example of 
> this.
>
> I view the latency-sensitive use cases as a higher priority for us and 
> a better match to the work we're doing here.
>
> Thanks,
> Jonathan R.
>
> On 6/27/2011 3:36 AM, Magnus Westerlund wrote:
>> WG,
>>
>> At the interim it was planned to have a bit discussion on the datagram
>> service for RTCWEB. The first question to try to resolve if there
>> is consensus for including some form of non real-time media (i.e. not
>> audio, video) service between peers. This is a bit tangled with the
>> actual requirements and use cases. But there was views both for it and
>> against it on the mailing list. So lets continue and try to come to a
>> conclusion on this discussion.
>>
>> The use cases mentioned on the mailing list are:
>>
>> - Dynamic meta data for Conference and other real-time services
>>
>> - Gaming data with low latency requirements
>>
>> Does anyone like to add additional use cases?
>>
>> Based on my personal understanding this points to primarily have the
>> RTCWEB provide a unreliable datagram service. This clearly needs
>> additional requirements to be secure and safe to deploy, but more about
>> this below. I still like to ask the WG here a question.
>>
>> Are you supporting the inclusion of a unreliable datagram service
>> directly between peers? Please provide your view and any additional
>> statements of motivation that you desire to provide.
>>
>> Secondly, there is a question if there needs to have something that
>> provides reliable message (of arbitrary size) or byte stream oriented
>> data transport between the peers. I personally foresee that people will
>> build JS libraries for this on top of a unreliable datagram service. If
>> you desire reliable data service as part of the standardized solution
>> please provide motivation and use case and requirements.
>>
>> I also want to take a stab on what I personally see as the requirements
>> that exist on unreliable datagram service in the context of RTCWEB.
>>
>> - Unreliable data transmission
>> - Datagram oriented
>>     * Size limited by MTU
>>       - Path MTU discovery needed
>>     * Fragmentation by the application
>> - Low latency, i.e. Peer to Peer preferable
>> - Congestion Controlled, to be
>>     * Network friendly
>>     * Not become a Denial of Service tool
>> - Security
>>    * Confidentiality
>>    * Integrity Protected
>>    * Source Authenticated (at least bound to the signalling peer)
>>    * Ensure consent to receive data
>>
>> Please debate the above. This is an attempt to ensure that we can
>> establish WG consensus on both data service and any requirements.
>>
>> cheers
>>
>> Magnus Westerlund
>>
>> ----------------------------------------------------------------------
>> Multimedia Technologies, Ericsson Research EAB/TVM
>> ----------------------------------------------------------------------
>> Ericsson AB                | Phone  [phone]
>> F�r�gatan 6                | Mobile [phone]
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>>
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>> https://www.ietf.org/mailman/listinfo/rtcweb
>


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