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

Alex,

I agree with your comments, and believe it is important to point out that
while 802.16e will be used by moble terminals, it will also be used by fixed
terminals (e.g., LAN WiMAX modem) -- by both retail & enterprise customers.
I believe that this reinforces the requirements which you have noted...

Ray

-----Original Message-----
From: Alexandru Petrescu [mailto:alexandru.petrescu@motorola.com] 
Sent: Friday, January 12, 2007 8:44 AM
To: pars.mutaf@int-evry.fr
Cc: v6ops@ops.ietf.org; 16ng@ietf.org
Subject: 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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