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Message from discussion 802.11b
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Gary Pei  
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 More options Aug 12 2009, 7:50 pm
From: Gary Pei <guangyu....@boeing.com>
Date: Wed, 12 Aug 2009 16:50:33 -0700 (PDT)
Local: Wed, Aug 12 2009 7:50 pm
Subject: Re: 802.11b
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I took a look at the third.cc example for 802.11b. The problem is that
you have to set 802.11b standard for MAC as well to call correct
WifiMac::SetStandard (enum WifiPhyStandard standard) function.

So, here is correct way to use 802.11b for third.cc

87d86
<   phy.Set ("Standard", StringValue ("802.11b") );
97,98c96
<     "ActiveProbing", BooleanValue (false),
<     "Standard", StringValue ("802.11b"));
---

>     "ActiveProbing", BooleanValue (false));

106,107c104
<     "BeaconInterval", TimeValue (Seconds (2.5)),
<     "Standard", StringValue ("802.11b"));

Gary

On Aug 7, 4:21 pm, Tom Henderson <t...@tomh.org> wrote:

> Nicola Baldo wrote:
> > Hi,

> > On Aug 5, 4:39 am, cb <cbellett...@gmail.com> wrote:
> >> hello all,
> >> I'm trying to use the 802.11b as phy instead of the default 802.11a in
> >> an infrastructured wireless network. in order to do that, I just call
> >> YansWifiPhyHelper::SetStandard("Standard", StringValue("802.11b")) on
> >> the relevant object.

> >> unfortunately, nothing appears to work at all. looking at the pcap
> >> traces, associations to the AP are very problematic and with lots of
> >> retransmissions (though associations are at last successful), and
> >> packets are not delivered at all, since nobody answers the ARP
> >> requests of the sending node. I found the same behavior in my own code
> >> and in the third.cc example as well (once 802.11b is set up).

> >> any clues on why this happens? I couldn't find any.

> > I don't have the code at hand to check this, but I remember that some
> > time ago I faced a similar problem when modifying a simulation program
> > to make it run with 802.11b instead of 802.11a. The issue was that the
> > SetStandard command did not change the value for the ACK timeout
> > (which should be longer in 802.11b), and STA association failed
> > because of this. Well, I guess I should have filed a bug report for
> > this issue, but at the time the only 802.11b example program in ns3
> > was not working, so I ended up filing bug 642 instead (http://
> >www.nsnam.org/bugzilla/show_bug.cgi?id=642).
> > Since that bug was closed, if you could check whether examples/wifi-
> > clear-channel-cmu exhibits the same problem you are experiencing, and
> > post a bug report if positive, it would be great.

> I filed a bug on this issue:http://www.nsnam.org/bugzilla/show_bug.cgi?id=655

> The answer may not be a trivial fix since this attribute is trying to
> set the values of other attributes.

> Tom


 
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