The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_rssadapt.h

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    1 /* $NetBSD: ieee80211_rssadapt.h,v 1.7 2009/10/19 23:19:39 rmind Exp $ */
    2 /*-
    3  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or
    6  * without modification, are permitted provided that the following
    7  * conditions are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above
   11  *    copyright notice, this list of conditions and the following
   12  *    disclaimer in the documentation and/or other materials provided
   13  *    with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   17  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   18  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   19  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   26  * OF SUCH DAMAGE.
   27  */
   28 
   29 #ifndef _NET80211_IEEE80211_RSSADAPT_H_
   30 #define _NET80211_IEEE80211_RSSADAPT_H_
   31 
   32 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
   33  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
   34  * by Javier del Prado Pavon and Sunghyun Choi.
   35  */
   36 
   37 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
   38 #define IEEE80211_RSSADAPT_BKTS         3
   39 #define IEEE80211_RSSADAPT_BKT0         128
   40 #define IEEE80211_RSSADAPT_BKTPOWER     3       /* 2**_BKTPOWER */
   41 
   42 #define ieee80211_rssadapt_thresh_new \
   43     (ieee80211_rssadapt_thresh_denom - ieee80211_rssadapt_thresh_old)
   44 #define ieee80211_rssadapt_decay_new \
   45     (ieee80211_rssadapt_decay_denom - ieee80211_rssadapt_decay_old)
   46 #define ieee80211_rssadapt_avgrssi_new \
   47     (ieee80211_rssadapt_avgrssi_denom - ieee80211_rssadapt_avgrssi_old)
   48 
   49 struct ieee80211_rssadapt_expavgctl {
   50         /* RSS threshold decay. */
   51         u_int rc_decay_denom;
   52         u_int rc_decay_old;
   53         /* RSS threshold update. */
   54         u_int rc_thresh_denom;
   55         u_int rc_thresh_old;
   56         /* RSS average update. */
   57         u_int rc_avgrssi_denom;
   58         u_int rc_avgrssi_old;
   59 };
   60 
   61 struct ieee80211_rssadapt {
   62         /* exponential average RSSI << 8 */
   63         u_int16_t               ra_avg_rssi;
   64         /* Tx failures in this update interval */
   65         u_int32_t               ra_nfail;
   66         /* Tx successes in this update interval */
   67         u_int32_t               ra_nok;
   68         /* exponential average packets/second */
   69         u_int32_t               ra_pktrate;
   70         /* RSSI threshold for each Tx rate */
   71         u_int16_t               ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
   72                                               [IEEE80211_RATE_SIZE];
   73         struct timeval          ra_last_raise;
   74         struct timeval          ra_raise_interval;
   75 };
   76 
   77 /* Properties of a Tx packet, for link adaptation. */
   78 struct ieee80211_rssdesc {
   79         u_int                    id_len;        /* Tx packet length */
   80         u_int                    id_rateidx;    /* index into ni->ni_rates */
   81         struct ieee80211_node   *id_node;       /* destination STA MAC */
   82         u_int8_t                 id_rssi;       /* destination STA avg RSS @
   83                                                  * Tx time
   84                                                  */
   85 };
   86 
   87 void    ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *);
   88 void    ieee80211_rssadapt_input(struct ieee80211com *, struct ieee80211_node *,
   89             struct ieee80211_rssadapt *, int);
   90 void    ieee80211_rssadapt_lower_rate(struct ieee80211com *,
   91             struct ieee80211_node *, struct ieee80211_rssadapt *,
   92             struct ieee80211_rssdesc *);
   93 void    ieee80211_rssadapt_raise_rate(struct ieee80211com *,
   94             struct ieee80211_rssadapt *, struct ieee80211_rssdesc *);
   95 int     ieee80211_rssadapt_choose(struct ieee80211_rssadapt *,
   96             struct ieee80211_rateset *, struct ieee80211_frame *, u_int, int,
   97             const char *, int);
   98 #ifdef IEEE80211_DEBUG
   99 extern int ieee80211_rssadapt_debug;
  100 #endif /* IEEE80211_DEBUG */
  101 
  102 #endif /* !_NET80211_IEEE80211_RSSADAPT_H_ */
  103 

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