Return-path: Received: from mail-ob0-f170.google.com ([209.85.214.170]:36404 "EHLO mail-ob0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751729AbaJXTXx (ORCPT ); Fri, 24 Oct 2014 15:23:53 -0400 Received: by mail-ob0-f170.google.com with SMTP id nt9so929992obb.1 for ; Fri, 24 Oct 2014 12:23:52 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <544A7871.7020005@mailservices.uwaterloo.ca> Date: Sat, 25 Oct 2014 00:23:52 +0500 Message-ID: (sfid-20141024_212357_337201_23A79085) Subject: Re: [ath9k-devel] strange MPDU loss pattern From: Kamran Nishat To: Adrian Chadd Cc: Ali Abedi , ath9k-devel , "linux-wireless@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: But for this channel conditions should be changing at the scale of 100 micro secs consistently. On Sat, Oct 25, 2014 at 12:13 AM, Adrian Chadd wrote: > It's not completely unsurprising - the initial channel estimate and > such is done at the beginning of each packet and stays constant. So if > there's some varying channel conditions that change that during the > duration of a packet, the tail end is going to end up having less SNR > and may end up getting more errors. > > > -adrian > > On 24 October 2014 09:04, Ali Abedi wrote: >> Hello, >> >> We study the effects of 802.11n frame aggregation on throughput. We noticed >> a >> strange pattern in the MPDU loss within an aggregated frame. It seems that >> the >> second half of the MPDUs (those with higher sequence numbers) in an >> aggregated frame >> are more likely to be lost. Is this a known fact or is there any explanation >> for it? >> >> For example if 32 frames are aggregated with sequence numbers 100 to 131. >> Frames with sequence numbers 100-115 are more likely to be received >> correctly >> than 116-131. >> >> >> Best, >> Ali >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > _______________________________________________ > ath9k-devel mailing list > ath9k-devel@lists.ath9k.org > https://lists.ath9k.org/mailman/listinfo/ath9k-devel