sys/netproto/802_11/ieee80211_rssadapt.h

   1 /*      $FreeBSD$       */
   2 /* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */
   3 /*-
   4  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or
   7  * without modification, are permitted provided that the following
   8  * conditions are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above
  12  *    copyright notice, this list of conditions and the following
  13  *    disclaimer in the documentation and/or other materials provided
  14  *    with the distribution.
  15  * 3. The name of David Young may not be used to endorse or promote
  16  *    products derived from this software without specific prior
  17  *    written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
  20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
  23  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  25  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  30  * OF SUCH DAMAGE.
  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 struct ieee80211_rssadapt {
  46         const struct ieee80211vap *vap;
  47         int     interval;                       /* update interval (ticks) */
  48 };
  49
  50 struct ieee80211_rssadapt_node {
  51         struct ieee80211_rssadapt *ra_rs;       /* backpointer */
  52         struct ieee80211_rateset ra_rates;      /* negotiated rates */
  53         int     ra_rix;                         /* current rate index */
  54         int     ra_ticks;                       /* time of last update */
  55         int     ra_last_raise;                  /* time of last rate raise */
  56         int     ra_raise_interval;              /* rate raise time threshold */
  57
  58         /* Tx failures in this update interval */
  59         uint32_t                ra_nfail;
  60         /* Tx successes in this update interval */
  61         uint32_t                ra_nok;
  62         /* exponential average packets/second */
  63         uint32_t                ra_pktrate;
  64         /* RSSI threshold for each Tx rate */
  65         uint16_t                ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
  66                                               [IEEE80211_RATE_SIZE];
  67 };
  68
  69 #define IEEE80211_RSSADAPT_SUCCESS      1
  70 #define IEEE80211_RSSADAPT_FAILURE      0
  71 #endif /* _NET80211_IEEE80211_RSSADAPT_H_ */