99 lines
3.7 KiB
C
99 lines
3.7 KiB
C
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/* $FreeBSD$ */
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/* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry 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 RAL_RSSADAPT_BKTS 3
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#define RAL_RSSADAPT_BKT0 128
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#define RAL_RSSADAPT_BKTPOWER 3 /* 2**_BKTPOWER */
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#define ral_rssadapt_thresh_new \
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(ral_rssadapt_thresh_denom - ral_rssadapt_thresh_old)
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#define ral_rssadapt_decay_new \
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(ral_rssadapt_decay_denom - ral_rssadapt_decay_old)
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#define ral_rssadapt_avgrssi_new \
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(ral_rssadapt_avgrssi_denom - ral_rssadapt_avgrssi_old)
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struct ral_rssadapt_expavgctl {
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/* RSS threshold decay. */
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u_int rc_decay_denom;
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u_int rc_decay_old;
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/* RSS threshold update. */
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u_int rc_thresh_denom;
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u_int rc_thresh_old;
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/* RSS average update. */
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u_int rc_avgrssi_denom;
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u_int rc_avgrssi_old;
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};
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struct ral_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[RAL_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 ral_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 ral_rssadapt_updatestats(struct ral_rssadapt *);
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void ral_rssadapt_input(struct ieee80211com *, struct ieee80211_node *,
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struct ral_rssadapt *, int);
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void ral_rssadapt_lower_rate(struct ieee80211com *,
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struct ieee80211_node *, struct ral_rssadapt *,
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struct ral_rssdesc *);
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void ral_rssadapt_raise_rate(struct ieee80211com *,
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struct ral_rssadapt *, struct ral_rssdesc *);
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int ral_rssadapt_choose(struct ral_rssadapt *,
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struct ieee80211_rateset *, struct ieee80211_frame *, u_int,
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const char *, int);
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