RE: stds-802-16-tg4: coexistence with 802.11/802.15
Ken,
Defining antenna radiation pattern limits is one of the
tools in the co-existence game. The problem is the range
from our "omni"-approach to John Sydor's 10-15 degree beams,
with most of you other guys somewhere in between. Thus it
might be difficult to define reasonable numbers unless it
is done case by case. Anyhow, we can state that it is in
the group's interest to minimize any side or backlobe
radiation of the antennas used (and this is very true since
we gain too).
Another issue is the vertical radiation pattern. Since FWA
systems tend to operate in the horizontal plane, we could
try to set limits on vertical radiation patterns. This would
have real impact on co-existence with 802.11/802.15 devices
below and even satellites above!
BR
Jori
> -----Original Message-----
> From: ext Ken Peirce [mailto:ken@Malibunetworks.com]
> Sent: 09 April, 2001 21:11
> To: 'stds-802-16-tg4@ieee.org'
> Subject: stds-802-16-tg4: coexistence with 802.11/802.15
>
>
> All,
> In addressing the coexistence issue where 802.11 and 802.15 are
> concerned, I would like to know what the PHY team would think
> of instituting
> a maximum on power behind the antenna (back
> lobes/backscatter). I believe
> that in most cases the antenna for a UNII system will be
> pointed away from
> the building it is attached to. It is hardly ideal, but what
> if we simply
> required an Xdb signal strength drop in the 180 degrees of
> the back side of
> the antenna? I know that there are outdoor capable EM
> absorbing foams in
> this frequency band available. There are also a lot of other means
> available. While smart antennas may be a solution as well, I
> was looking for
> a simple, inexpensive option too. Also, I would like to keep
> the MAC as
> simple as possible with its coexistence role limited to other UNII BWA
> systems. I am not an expert in this area, but I would like to hear the
> opinions of those who are PRIOR to the next meeting.
>
> Thanks,
> Ken Peirce
>
> Disclaimer: The opinions stated here are mine and not
> necessarily those of
> Malibu Networks.
>