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 /* $OpenBSD: ieee80211_rssadapt.h,v 1.5 2010/07/17 16:25:09 damien Exp $ */
    2 /* $NetBSD: ieee80211_rssadapt.h,v 1.3 2004/05/06 03:03:20 dyoung Exp $ */
    3 
    4 /*-
    5  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or
    8  * without modification, are permitted provided that the following
    9  * conditions are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above
   13  *    copyright notice, this list of conditions and the following
   14  *    disclaimer in the documentation and/or other materials provided
   15  *    with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
   18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   20  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
   21  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   23  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   28  * OF SUCH DAMAGE.
   29  */
   30 #ifndef _NET80211_IEEE80211_RSSADAPT_H_
   31 #define _NET80211_IEEE80211_RSSADAPT_H_
   32 
   33 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
   34  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
   35  * by Javier del Prado Pavon and Sunghyun Choi.
   36  */
   37 
   38 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
   39 #define IEEE80211_RSSADAPT_BKTS         3
   40 #define IEEE80211_RSSADAPT_BKT0         128
   41 #define IEEE80211_RSSADAPT_BKTPOWER     3       /* 2**_BKTPOWER */
   42 
   43 #define ieee80211_rssadapt_thresh_new \
   44     (ieee80211_rssadapt_thresh_denom - ieee80211_rssadapt_thresh_old)
   45 #define ieee80211_rssadapt_decay_new \
   46     (ieee80211_rssadapt_decay_denom - ieee80211_rssadapt_decay_old)
   47 #define ieee80211_rssadapt_avgrssi_new \
   48     (ieee80211_rssadapt_avgrssi_denom - ieee80211_rssadapt_avgrssi_old)
   49 
   50 struct ieee80211_rssadapt_expavgctl {
   51         /* RSS threshold decay. */
   52         u_int rc_decay_denom;
   53         u_int rc_decay_old;
   54         /* RSS threshold update. */
   55         u_int rc_thresh_denom;
   56         u_int rc_thresh_old;
   57         /* RSS average update. */
   58         u_int rc_avgrssi_denom;
   59         u_int rc_avgrssi_old;
   60 };
   61 
   62 struct ieee80211_rssadapt {
   63         /* exponential average RSSI << 8 */
   64         u_int16_t               ra_avg_rssi;
   65         /* Tx failures in this update interval */
   66         u_int32_t               ra_nfail;
   67         /* Tx successes in this update interval */
   68         u_int32_t               ra_nok;
   69         /* exponential average packets/second */
   70         u_int32_t               ra_pktrate;
   71         /* RSSI threshold for each Tx rate */
   72         u_int16_t               ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
   73                                     [IEEE80211_RATE_SIZE];
   74         struct timeval          ra_last_raise;
   75         struct timeval          ra_raise_interval;
   76 };
   77 
   78 /* Properties of a Tx packet, for link adaptation. */
   79 struct ieee80211_rssdesc {
   80         u_int                    id_len;        /* Tx packet length */
   81         u_int                    id_rateidx;    /* index into ni->ni_rates */
   82         struct ieee80211_node   *id_node;       /* destination STA MAC */
   83         u_int8_t                 id_rssi;       /* destination STA avg RSS @
   84                                                  * Tx time
   85                                                  */
   86 };
   87 
   88 void    ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *);
   89 void    ieee80211_rssadapt_input(struct ieee80211com *,
   90             const struct ieee80211_node *, struct ieee80211_rssadapt *, int);
   91 void    ieee80211_rssadapt_lower_rate(struct ieee80211com *,
   92             const struct ieee80211_node *, struct ieee80211_rssadapt *,
   93             const struct ieee80211_rssdesc *);
   94 void    ieee80211_rssadapt_raise_rate(struct ieee80211com *,
   95             struct ieee80211_rssadapt *, const struct ieee80211_rssdesc *);
   96 int     ieee80211_rssadapt_choose(struct ieee80211_rssadapt *,
   97             const struct ieee80211_rateset *, const struct ieee80211_frame *,
   98             u_int, int, const char *, int);
   99 #ifdef IEEE80211_DEBUG
  100 extern int ieee80211_rssadapt_debug;
  101 #endif /* IEEE80211_DEBUG */
  102 
  103 #endif /* _NET80211_IEEE80211_RSSADAPT_H_ */

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