RE: Requirements

["Dana L. Blair" <dblair@cisco.com>]

My comments below.

...

>   > it is just that the mobility of wireless subscribers as well as some
>   unique
>   > performance requirements/problems in the air interface may
>   indeed bring
>   out
>   > special requirements - perhaps more so in the macro cell
>   environment of
>   > wireless operators than in controlled micro/pico cell links

For the past 2.5 years I have been asking the question is
there anything special about wireless that impacts application,
transport, or IP protocols that is different than wired.

Up til now, the only exception for wireless than wired that
I have discovered is handoff.  I believe that we SHOULD
view the wireless access network as just another Layer 2.

Here are some examples of suggested differences.

1.  Wireless links are special because they have low bandwidth and 	large
latency.

	Some wired links are slow and have large latency too.

	V.22 modems run over the PSTN and are slow with large latency.  	TCP was
designed to optimize bandwidth on slow and fast links.
	V.42bis, MNP compression, and Header compression were 	invented several
years ago to improve performance n
	wired links.

2.  Wireless links are special because they are error prone.

	Some wired links are error prone too.

	Many PSTN connections are error prone depending on wiring.
	MNP and V.42 error correction protocols were created several 	years ago to
fix errors in the link layer.

	The RLP layer of cellular standards provides the same
	function.

3.  Wireless devices are special because they move.

	Roaming:
	Wired devices roam too.
	My laptop roams because it plugs into an ethernet at
	home or in the office depending on where I want to
	work.

	Handoff:
	One possible exception for wireless is handoff.  There is
	really no need that I can think of for handoff in
	the wired world, but the Mobile IP WG seems to getting
	the right idea of Internet Handoff for wireless devices.

4.  Wireless devices are special because they need to know where 	they are -
Location services.

	Wired elements devices can benefit from location services
	too, and be supported with a small inexpensive GPS chip.

thanks,
Dana

>   >
>   > some of these come through in Paul Reynolds draft - as
>   wireless operators
>   > get engaged in these requirements some of the things that
>   make wireless
>   > different may be highlighted - i'm reviewing the draft now
>   >
>   > Richard Robinson
>   > Sprint PCS
>   > 15405 College Boulevard
>   > Lenexa, Kansas 66219
>   > 913.890.4242 (fax 4100)
>   > MS - KSLNXZ0201
>   > rrobin01@sprintspectrum.com
>   >
>   > -----Original Message-----
>   > From: tim clifford [mailto:tjc@lacunanet.net]
>   > Sent: Monday, July 16, 2001 11:23 AM
>   > To: James Kempf; more@ops.ietf.org; jgw@cisco.com
>   > Subject: RE: Requirements
>   >
>   > which would seem to imply that we need to try to convince
>   people at the
>   ietf
>   > (i think its a misnomer to say "convince the ietf") that we're talking
>   about
>   > more than a link layer, maybe the right term is mobility, or roaming
>   > services, or disadvantaged user devices, or large populations
>   of always on
>   > subscribers  ;-)
>   >
>   > tc
>   >
>   > > -----Original Message-----
>   > > From: owner-more@ops.ietf.org
>   [mailto:owner-more@ops.ietf.org]On Behalf
>   > > Of James Kempf
>   > > Sent: Monday, July 16, 2001 11:47 AM
>   > > To: more@ops.ietf.org; jgw@cisco.com
>   > > Subject: Re: Requirements
>   > >
>   > >
>   > > John,
>   > >
>   > > There is no such catalog. In general, IETF has been resistent to
>   > > making wireless a special category. It is viewed as just
>   another link
>   > > layer.
>   > >
>   > >               jak
>   > >
>   > > >Date: Sat, 14 Jul 2001 11:15:34 -0400
>   > > >From: "John G. Waclawsky" <jgw@cisco.com>
>   > > >To: more@ops.ietf.org
>   > > >Subject: Re: Requirements
>   > > >
>   > > >Does anyone know if the IETF does an cataloguing of activities
>   > > with regards to
>   > > wireless?
>   > > >For example is there a cross reference anywhere that
>   describes wireless
>   > > activities going
>   > > >on in the IETF?  This information would probably be very uesful
>   > > for the mobile
>   > > >operators.    Regards  John
>   > > >
>   > > >
>   > >
>