Return-path: Received: from an-out-0708.google.com ([209.85.132.243]:64961 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756866AbZFKDvy convert rfc822-to-8bit (ORCPT ); Wed, 10 Jun 2009 23:51:54 -0400 Received: by an-out-0708.google.com with SMTP id d40so2256320and.1 for ; Wed, 10 Jun 2009 20:51:56 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <3ace41890906102008u421f5669m3cf23a437f63d278@mail.gmail.com> References: <3ace41890906081659o23cb9ee1sd82ca4fc28a3793d@mail.gmail.com> <69e28c910906090426l4c383665rdc4bffc501085661@mail.gmail.com> <3ace41890906092018o76b0ee62n91819779a8ccd6db@mail.gmail.com> <1244619027.18481.55.camel@johannes.local> <3ace41890906100639gb800904td06d86efef90e656@mail.gmail.com> <69e28c910906100822q6eae8b29p2381220b23b4f4b1@mail.gmail.com> <1244648968.4178.5.camel@johannes.local> <3ace41890906102008u421f5669m3cf23a437f63d278@mail.gmail.com> From: "Luis R. Rodriguez" Date: Wed, 10 Jun 2009 20:51:36 -0700 Message-ID: <43e72e890906102051l2169e91dvc2c2c8406eb61144@mail.gmail.com> Subject: Re: Testing AP mode with WLAN-USB-Stick: How to obtain? To: Hin-Tak Leung Cc: Johannes Berg , =?UTF-8?Q?G=C3=A1bor_Stefanik?= , Stefan Steuerwald , linux-wireless@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Wed, Jun 10, 2009 at 8:08 PM, Hin-Tak Leung wrote: > 2009/6/10 Johannes Berg : > >> Now, it may or may not be possible to work around this in software by >> sending out the multicast frames on a high-priority queue right after >> the beacon, or something like that, but frankly I'm not interested in >> working on zd1211rw myself, so that will have to be somebody who is (a) >> familiar with 802.11 powersaving and multicast buffering, (b) wants >> zd1211rw to work, and finally (c) has a lot of time to play with the >> device. > > For the sake of being pedantic, can I have some reference (if only for > those sleepless nights for lack of boring reading materials...)? Maybe >  I won't understand it anyway, but maybe somebody else who is > listening in to this exchange can chip in. > I have a 1300-page pdf supposedly the  802.11 2007 standard I > downloaded some months ago through one of the wikipedia links, I think > (somewhere under http://standards.ieee.org/) ... chapter 11 is MLME > and section 11.2 is power management, which in turn is split into two > sub-sections about power management in infrastructure nework and IBSS > mode. I found a particular sentence in section 11.2.1. which sounds a > bit like what you are saying (except with some cryptic acronyms!): > > ------ > If any STA in its BSS is in PSmode, the AP shall buffer all broadcast > and multicast MSDUs and deliver them to all STAs immediately > following the next Beacon frame containing a DTIM transmission. > ------ > > Have I found the right place to read up on such things, or there are > other documents, etc (more detailed, or more "layman")? This might be helpful: http://wireless.kernel.org/en/developers/Documentation/ieee80211/power-savings Luis