From owner-freebsd-mobile@FreeBSD.ORG  Sat Mar 18 04:30:25 2006
Return-Path: <owner-freebsd-mobile@FreeBSD.ORG>
X-Original-To: freebsd-mobile@freebsd.org
Delivered-To: freebsd-mobile@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id CA53716A4D6;
	Sat, 18 Mar 2006 04:30:25 +0000 (UTC) (envelope-from bms@spc.org)
Received: from mindfull.spc.org (mindfull.spc.org [83.167.185.3])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 243E643D62;
	Sat, 18 Mar 2006 04:30:22 +0000 (GMT) (envelope-from bms@spc.org)
Received: from arginine.spc.org ([83.167.185.2])
	by mindfull.spc.org with esmtps (TLSv1:AES256-SHA:256) (Exim 4.52)
	id 1FKT51-0002kc-RS; Sat, 18 Mar 2006 04:30:19 +0000
Received: from localhost (localhost [127.0.0.1])
	by arginine.spc.org (Postfix) with ESMTP
	id 26D6B65499; Sat, 18 Mar 2006 04:30:20 +0000 (GMT)
Received: from arginine.spc.org ([127.0.0.1])
	by localhost (arginine.spc.org [127.0.0.1]) (amavisd-new, port 10024)
	with LMTP id 45076-03; Sat, 18 Mar 2006 04:30:19 +0000 (GMT)
Received: by arginine.spc.org (Postfix, from userid 1078)
	id 32C16653F9; Sat, 18 Mar 2006 04:30:19 +0000 (GMT)
Date: Sat, 18 Mar 2006 04:30:19 +0000
From: Bruce M Simpson <bms@spc.org>
To: Kan Cai <kcai@cs.ubc.ca>
Message-ID: <20060318043019.GR37590@spc.org>
Mail-Followup-To: Bruce M Simpson <bms@spc.org>,
	Kan Cai <kcai@cs.ubc.ca>, freebsd-mobile@freebsd.org,
	freebsd-net@freebsd.org
References: <Pine.LNX.4.60.0603171355470.9710@lore.cs.ubc.ca>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Pine.LNX.4.60.0603171355470.9710@lore.cs.ubc.ca>
User-Agent: Mutt/1.4.1i
Organization: Incunabulum
X-AntiAbuse: This header was added to track abuse,
	please include it with any abuse report
X-AntiAbuse: Primary Hostname - mindfull.spc.org
X-AntiAbuse: Original Domain - freebsd.org
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - spc.org
X-Source: 
X-Source-Args: 
X-Source-Dir: 
Cc: freebsd-net@freebsd.org, freebsd-mobile@freebsd.org
Subject: Re: Wireless sensing function is missing?
X-BeenThere: freebsd-mobile@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Mobile computing with FreeBSD <freebsd-mobile.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>, 
	<mailto:freebsd-mobile-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-mobile>
List-Post: <mailto:freebsd-mobile@freebsd.org>
List-Help: <mailto:freebsd-mobile-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-mobile>,
	<mailto:freebsd-mobile-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 18 Mar 2006 04:30:25 -0000

On Fri, Mar 17, 2006 at 02:00:28PM -0800, Kan Cai wrote:
>   I wonder if this is true that sensing function is missing? If yes, is it 
> supposed to be implemented in the driver or net80211 layer? Thanks in 
> advance!

It's a function of the 802.11 hardware. I assume you're describing the
CSMA/CA technique. The Coordination Function (CF) in use will also have
an effect but you don't specify if you're in IBSS or EBSS mode.

How are you getting these figures anyway?

Regards,
BMS