Hi,
In the Vancouver meeting minutes there is mention about multicast
bandwidth admission control, and what to do with "best effort" streams.
Apparently there is some confusion on the concept. This email is the
clarify my view on this.
As already described in section 3.4.2, there is a need - next to policy
based admission control - to perform CAC for the video content being
streamed across the access network. The different options to do so are
already defined in the framework document.
Now, the point I wanted to bring up is that in general, the Access Node
and NAS cannot be aware of all possible multicast groups. It is likely
that there may be multicast channels offered across the Internet. For
these streams, performing bandwidth admission control may be
challenging.
To solve this, these requests should by default be accepted, but the
network should handle the traffic as best effort. This can be done by
first of all adding a "catch-all statement" in the Access Node white
list or grey list. In case the Access Node queries the NAS, the NAS on
his turn will have to accept the request. That way, the unknown streams
are not blocked by default. Next, the NAS must make sure that the
multicast content coming from the Internet is marked as best effort
traffic. This way, whenever congestion occurs somewhere in the
access/aggregation network, this stream will be kicked out before the
access provider's own premium content.
If people agree with this, I suggest to add the above discussion to the
framework document.
Regards,
Sven
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