Re: [16NG] Re: multicast and IPv6 over ETHCS

Hi Pars, I would like so see others' oppinions on this too.

Pars Mutaf wrote:
> Hi, sorry for popping up,
> 
> On Fri, 2007-01-12 at 12:19 +0100, Alexandru Petrescu wrote:
>> Hi Jihoon, thanks for reply,
>> 
>> Jihoon Lee wrote:
>>> Hi Alex,
>>> 
>>> Let me jump into discussion. 1) 802.16/16e MAC has no capability 
>>> to do uplink multicast. In DL, 802.16 provides multicast CIDs 
>>> which is initiated by DSA messages. In UL, however, there is no 
>>> way for an MS to access others' UL data fundamentally, in 802.16 
>>> PHY/MAC.
> 
> Do you think this is an accidental design choice (i.e. no uplink 
> multicast)? Or 802.16/16e MAC designers had very good fundamental 
> reasons?

I'm not a link-layer designer.  I think the choice for 802.16MAC to
design multicast only downlink (not ul) is inline with the widespread
usage of mobile terminals: clients download stuff, rarely upload.

Multi-party video calls (not even IP) need however multicast to run
bothways ok to gain in efficiency.

And there are link-layers (802.11) that offer a multicast appearence to
the IP stack, bothways, despite the lower layer packet being sent
through the AP always.  This should happen over 802.16MAC ETHCS too,
otherwise ND won't work.

Alex

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