9c65c69cd6
Adaptation Strategy for IEEE 802.11 WLAN via Received Signal Strength Measurement" by Javier del Prado Pavon and Sunghyun Choi. This module should provide faster adaptation and higher throughput than Lucent's rate-adaptation scheme. Individual drivers need to be modified to use this module. Patches for wi(4) are forthcoming.
84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/* $NetBSD: ieee80211_rssadapt.h,v 1.1 2003/10/26 07:56:41 dyoung Exp $ */
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/*-
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* Copyright (c) 2003, 2004 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
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* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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/* Data-rate adaptation loosely based on "Link Adaptation Strategy
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* for IEEE 802.11 WLAN via Received Signal Strength Measurement"
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* by Javier del Prado Pavon and Sunghyun Choi.
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*/
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/* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
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#define IEEE80211_RSSADAPT_BKTS 3
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#define IEEE80211_RSSADAPT_BKT0 128
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#define IEEE80211_RSSADAPT_BKTPOWER 3 /* 2**_BKTPOWER */
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#define ieee80211_rssadapt_thresh_new \
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(ieee80211_rssadapt_thresh_denom - ieee80211_rssadapt_thresh_old)
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#define ieee80211_rssadapt_decay_new \
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(ieee80211_rssadapt_decay_denom - ieee80211_rssadapt_decay_old)
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#define ieee80211_rssadapt_avgrssi_new \
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(ieee80211_rssadapt_avgrssi_denom - ieee80211_rssadapt_avgrssi_old)
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struct ieee80211_rssadapt {
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/* exponential average RSSI << 8 */
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u_int16_t ra_avg_rssi;
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/* Tx failures in this update interval */
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u_int32_t ra_nfail;
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/* Tx successes in this update interval */
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u_int32_t ra_nok;
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/* exponential average packets/second */
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u_int32_t ra_pktrate;
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/* RSSI threshold for each Tx rate */
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u_int16_t ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
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[IEEE80211_RATE_SIZE];
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struct timeval ra_last_raise;
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struct timeval ra_raise_interval;
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};
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/* Properties of a Tx packet, for link adaptation. */
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struct ieee80211_rssdesc {
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u_int id_len; /* Tx packet length */
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u_int id_rateidx; /* index into ni->ni_rates */
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struct ieee80211_node *id_node; /* destination STA MAC */
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u_int8_t id_rssi; /* destination STA avg RSS @
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* Tx time
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*/
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};
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void ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *);
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void ieee80211_rssadapt_input(struct ieee80211com *, struct ieee80211_node *,
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struct ieee80211_rssadapt *, int);
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void ieee80211_rssadapt_lower_rate(struct ieee80211com *,
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struct ieee80211_node *, struct ieee80211_rssadapt *,
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struct ieee80211_rssdesc *);
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void ieee80211_rssadapt_raise_rate(struct ieee80211com *,
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struct ieee80211_rssadapt *, struct ieee80211_rssdesc *);
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