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RE: [802.21] [DNA] Prefix information for link identification in DNA



Peretz, I thought we had decided to get away from the thinking that MIH is "below" L3 and "above" L2, since this is anyway incorrect. I still think we hve both L2 PoAs and L3 PoAs, depending on the specific scenarios. Limiting the PoA to be at L2 is ... well, too limiting. For 802.21 @ L3, the PoA is of course @ L3 snce the very first location where the <MIHF in the UE can send e.g. an IS request is @ or beyond the subnet where the UE gets its own IP address.
Stefano

________________________________

From: ext Peretz Feder [mailto:pfeder@LUCENT.COM]
Sent: Fri 9/30/2005 7:42 AM
To: STDS-802-21@listserv.ieee.org
Subject: Re: [802.21] [DNA] Prefix information for link identification in DNA


Within the discussion of MIH services, which is below layer 3, I would assume that MIH centric PoA should be below layer 3, no? 
This is the 802.21 reflector, correct? 

Once PoA L2 (or L2.5) is established between MIH on the UE and MIH in the 802.21 compliant PoA and MIH services provided thereof, we can discuss higher layers PoAs in relation to other relevant MIH elements that require L3 transport services.

Peretz Feder

On 9/30/2005 4:09 AM, Mike Moreton wrote:


	To extend (I think!) Stefano's point, before determining what the PoA is, you have first to be very clear about what you're attaching.  Just saying "the terminal" makes no sense, because different layers in the terminal's protocol stack attach to different places in the network.
	
	For example, the PHY layer attaches to the AP, but the TCP layer attaches to the destination host.
	
	Mike.
	
	  

		-----Original Message-----
		From: Stefano M. Faccin [mailto:stefano.faccin@NOKIA.COM] 
		Sent: Friday, September 30, 2005 1:08 AM
		To: STDS-802-21@listserv.ieee.org
		Subject: Re: [802.21] [DNA] Prefix information for link 
		identification in DNA
		
		
		Yoshihiro,
		I'm not sure why should restrict the term PoA to have only a 
		L2 meaning as you suggest below. I think we should 
		distinguish clearly between L2 PoA and L3 PoA. For me, the L3 
		PoA is where the terminal gets IP conenctivity. E.g. for GPRS 
		the L3 PoA is the IP link on which the GGSN is located. In 
		L2, PoA is the point where the access-specific L2 connection 
		terminates (e.g. an AP in 802.11).
		Stefano