Re: What's the benefit of L2 Triggers in 3G/Ad-Hoc systems ?

Kamesh,

I'd like to add slightly to Behcet's rsponse. As our work with Motorola
and Behcet's work shows, it should be possible to utilize Layer 2
triggers with current 3G radio protocols, but not necessarily with
current 3G radio access networks. Reduction of handover latency requires
modifying the connection-oriented model to reduce the amount of state
involved in maintaining a connection with the mobile node.

Ultimately, radio protocols that are a better match for IP are necessry
(so called 4G protocols). Flarion's flash OFDM is an example.

            jak

----- Original Message -----
From: "Behcet Sarikaya" <[email protected]>
To: "Kamesh Medepalli" <[email protected]>; "Phil Neumiller"
<[email protected]>
Cc: <[email protected]>; "JinHyeock Choi"
<[email protected]>; "James Carlson"
<[email protected]>; "Einar Vollset"
<[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>; <[email protected]>;
<[email protected]>; "Vernon Schryver" <[email protected]>
Sent: Monday, June 17, 2002 8:36 AM
Subject: Re: [pilc] What's the benefit of L2 Triggers in 3G/Ad-Hoc
systems ?


> Hello Kamesh,
>
> --- Kamesh Medepalli <[email protected]> wrote:
> ....
> >
> > Could one of the proponents of this issue refer me
> > to any work that quantifies
> > the merit of such a scheme for 3G and/or Ad-Hoc
> > systems?
> >
> > For the 3G systems (CDMA2000/UMTS) you would most
> > probably terminate the
> > IP connection at the PDSN/GGSN (more like HA in
> > Mobile-IP) and then run
> > a PPP link to the Mobile. Now, handoffs are done
> > much further away from
> > PDSN/GGSN and clearly, the latency is too much for
> > us derive any benefit
> > from any L2 info. Even if you do have that info fast
> > enough, you cannot
> > do much at IP layer since the Radio Access Network
> > works some-what like a
> > circuit. You do not perform any routing to the
> > Mobile beyond the PDSN/GGSN.
> > You just tunnel the PPP frames through GRE, GTP
> etc.>
> > I am curious about any work performed in this
> > area...
> >
> I can probably refer you to NTT-DOCOMO USA labs recent
> work on this. In collaboration with Motorola, they
> experimented in implementing Mobile IPv4 fast handover
> draft which contains L2 Handover triggers. I think
> that Motorola implemented the triggers on a CDMA2000
> 1X RTT radio and PDSN and they used it to get some
> benchmarks of handover.
>   Recently James Kempf made a presentation at IPCN02
> in Paris and his presentation can be found at:
> http://www.mplsworld.com/ipcn02/
> look for James Kemp's presentation here.
>   Also we wrote a paper which appeared at IEEE
> Communications Magazine's May 2002 issue on how L2
> triggers including paging triggers can be implemented
> using CDMA 2000 entities.
>   Yes you are absolutely right on your assessment that
> the benefits in real-time gains would probably be
> minimal which suggests looking for better radio
> architectures and ways of having Mobile IP function
> closer to the base station in public cellular networks
> is needed.
>
> > Thanks,
> > Kamesh
>
> Regards,
>
> --behcet
>
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