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 1.6 2005/12/10 23:26:35 elad 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  * 3. The name of David Young may not be used to endorse or promote
   15  *    products derived from this software without specific prior
   16  *    written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   21  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   22  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   24  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   29  * OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _NET80211_IEEE80211_RSSADAPT_H_
   33 #define _NET80211_IEEE80211_RSSADAPT_H_
   34 
   35 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
   36  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
   37  * by Javier del Prado Pavon and Sunghyun Choi.
   38  */
   39 
   40 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
   41 #define IEEE80211_RSSADAPT_BKTS         3
   42 #define IEEE80211_RSSADAPT_BKT0         128
   43 #define IEEE80211_RSSADAPT_BKTPOWER     3       /* 2**_BKTPOWER */
   44 
   45 #define ieee80211_rssadapt_thresh_new \
   46     (ieee80211_rssadapt_thresh_denom - ieee80211_rssadapt_thresh_old)
   47 #define ieee80211_rssadapt_decay_new \
   48     (ieee80211_rssadapt_decay_denom - ieee80211_rssadapt_decay_old)
   49 #define ieee80211_rssadapt_avgrssi_new \
   50     (ieee80211_rssadapt_avgrssi_denom - ieee80211_rssadapt_avgrssi_old)
   51 
   52 struct ieee80211_rssadapt_expavgctl {
   53         /* RSS threshold decay. */
   54         u_int rc_decay_denom;
   55         u_int rc_decay_old;
   56         /* RSS threshold update. */
   57         u_int rc_thresh_denom;
   58         u_int rc_thresh_old;
   59         /* RSS average update. */
   60         u_int rc_avgrssi_denom;
   61         u_int rc_avgrssi_old;
   62 };
   63 
   64 struct ieee80211_rssadapt {
   65         /* exponential average RSSI << 8 */
   66         u_int16_t               ra_avg_rssi;
   67         /* Tx failures in this update interval */
   68         u_int32_t               ra_nfail;
   69         /* Tx successes in this update interval */
   70         u_int32_t               ra_nok;
   71         /* exponential average packets/second */
   72         u_int32_t               ra_pktrate;
   73         /* RSSI threshold for each Tx rate */
   74         u_int16_t               ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
   75                                               [IEEE80211_RATE_SIZE];
   76         struct timeval          ra_last_raise;
   77         struct timeval          ra_raise_interval;
   78 };
   79 
   80 /* Properties of a Tx packet, for link adaptation. */
   81 struct ieee80211_rssdesc {
   82         u_int                    id_len;        /* Tx packet length */
   83         u_int                    id_rateidx;    /* index into ni->ni_rates */
   84         struct ieee80211_node   *id_node;       /* destination STA MAC */
   85         u_int8_t                 id_rssi;       /* destination STA avg RSS @
   86                                                  * Tx time
   87                                                  */
   88 };
   89 
   90 void    ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *);
   91 void    ieee80211_rssadapt_input(struct ieee80211com *, struct ieee80211_node *,
   92             struct ieee80211_rssadapt *, int);
   93 void    ieee80211_rssadapt_lower_rate(struct ieee80211com *,
   94             struct ieee80211_node *, struct ieee80211_rssadapt *,
   95             struct ieee80211_rssdesc *);
   96 void    ieee80211_rssadapt_raise_rate(struct ieee80211com *,
   97             struct ieee80211_rssadapt *, struct ieee80211_rssdesc *);
   98 int     ieee80211_rssadapt_choose(struct ieee80211_rssadapt *,
   99             struct ieee80211_rateset *, struct ieee80211_frame *, u_int, int,
  100             const char *, int);
  101 #ifdef IEEE80211_DEBUG
  102 extern int ieee80211_rssadapt_debug;
  103 #endif /* IEEE80211_DEBUG */
  104 
  105 #endif /* !_NET80211_IEEE80211_RSSADAPT_H_ */
  106 

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