Cell Relay Archive

[philiplo@clearnet.com]

In article <6d1cnp$898$1@nnrp1.dejanews.com>,
  albert.e.manfredi@boeing.com wrote:
>
> In article <199802242013.MAA15419@thranduil.trillium.com.trillium.com>,
>   rajeev@trillium.com (Rajeev Gupta) wrote:
>
> [ ... ]
>
> > In addition to the wireless aspects, WATM also has to deal with mobility
> > management in the network (this is sometimes referred to as mobile
> > ATM, MATM). There are two major aspects of mobility management:
> >
> > - location management: when a call is to be placed to a mobile terminal,
> >   its current location must be determined by the network.
> >
> > - handover: when a mobile terminal moves while maintaining connections,
> >   the connections need to be rerouted in the network in order to
> >   maintain connectivity.
> >
> > These functions require support in the network in the form of storage
> > functions (e.g. location registers) and control functions (e.g.
signalling
> > for handover). This work is being done in the WATM group of the
> > ATM Forum. Most likely the work will result in specifying enhancements
> > to existing protocols (e.g. UNI, PNNI, BICI) to support mobility.
>
> Rajeev,
>
> This is most interesting to me at the moment. Also, this difficult problem,
> as far as I can tell, is identical to that faced by mobile IP. Do you have
> a brief description of the general approach taken by the ATM forum that you
> could share on here?
>
> The solutions available today seem to be very compromised. What I think the
> ultimate solution would be is something like a real-time OSPF (hence
similar
> to PNNI), but hopefully without bringing down the whole structure with its
> own signaling overhead.
>
> I'd be curious how they are approaching this. Thanks.
>
> Bert
> manfredi@arl.bna.boeing.com
>
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The approach taken by ATM Forum is similar to IETF's Mobile IP as in RFC 2002
thru 2005. Eventually, Mobile IP can be layered on WATM location service.
Each mobile terminal will have a static home address used as point of
contact and a dynamically allocated foreign address assigned by the location
service. Data are tunnelled thru from the home to the foreign address.

This document, ATM Forum/96-1699/WATM, is a good place to start.

Philip

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