Hidden Node Issues !!!

Hi,

I am new to this forum. I am intrested to know as how can we solve
hidden node issues in Wireless LAN (IEEE 802.11b /Wi Fi) using the RTS/CTS
settings.

Thanks,

"Nav" <(E-Mail Removed)> wrote in message news:<4n0fb.24106$(E-Mail Removed) gy.com>...
> Hi,
>
> I am new to this forum. I am intrested to know as how can we solve
> hidden node issues in Wireless LAN (IEEE 802.11b /Wi Fi) using the RTS/CTS
> settings.
>
> Thanks,

RTS/CTS settings are used to specify when a client radio will REQUEST
TO SEND data. The RTS setting tells how many bytes may be transmitted
by the clinet to the AP without requesting to transmit thus having to
wait for a CTS from the AP.

The optimal setting of RTS varies from network to network because of
traffic volume, traffic type, number and topology of client radios.

If you believe you have hidden node issues in your WLAN:

*** Note START with RTS set to MAXIMUM allowed value ***
*** Note This SHOULD be done of every client radio ***

1) Make careful measurements of thruput from each client in the WLAN,
with the
WLAN under otherwise normal loads.
2) Set RTS = RTS / 2
3) Make measurements of thruput from each client in the WLAN
4) If you are happy QUIT
5) If things have improved GOTO step 2
6) If things have NOT improved
Set RTS = RTS+(RTS/2)
7) GOTO step 2
8) QUIT

This will give you an optimal setting after a few trips past step 2.

In most cases it is unlikely you need to change RTS at all. Usually
you can set all the clients to the same RTS value once you find it on
one of them. Where you have sever hidden node problems and many
client radios, this process should be iterated across the LAN two or
three times. It is a lot of work to really tweak RTS in a WLAN. It
is almost never worth the effort, but sometimes it can REALLY improve
things. This is particularily true in worst case hidden node
scenarios.

-m-

Michael,

thanks a lot for the detailed answer.I will try it today. I believe if can
control the b.w to each client, that should also help me.


"Michael Erskine" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> "Nav" <(E-Mail Removed)> wrote in message
news:<4n0fb.24106$(E-Mail Removed) gy.com>...
> > Hi,
> >
> > I am new to this forum. I am intrested to know as how can we solve
> > hidden node issues in Wireless LAN (IEEE 802.11b /Wi Fi) using the
RTS/CTS
> > settings.
> >
> > Thanks,
>
> RTS/CTS settings are used to specify when a client radio will REQUEST
> TO SEND data. The RTS setting tells how many bytes may be transmitted
> by the clinet to the AP without requesting to transmit thus having to
> wait for a CTS from the AP.
>
> The optimal setting of RTS varies from network to network because of
> traffic volume, traffic type, number and topology of client radios.
>
> If you believe you have hidden node issues in your WLAN:
>
> *** Note START with RTS set to MAXIMUM allowed value ***
> *** Note This SHOULD be done of every client radio ***
>
> 1) Make careful measurements of thruput from each client in the WLAN,
> with the
> WLAN under otherwise normal loads.
> 2) Set RTS = RTS / 2
> 3) Make measurements of thruput from each client in the WLAN
> 4) If you are happy QUIT
> 5) If things have improved GOTO step 2
> 6) If things have NOT improved
> Set RTS = RTS+(RTS/2)
> 7) GOTO step 2
> 8) QUIT
>
> This will give you an optimal setting after a few trips past step 2.
>
> In most cases it is unlikely you need to change RTS at all. Usually
> you can set all the clients to the same RTS value once you find it on
> one of them. Where you have sever hidden node problems and many
> client radios, this process should be iterated across the LAN two or
> three times. It is a lot of work to really tweak RTS in a WLAN. It
> is almost never worth the effort, but sometimes it can REALLY improve
> things. This is particularily true in worst case hidden node
> scenarios.
>
> -m-