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ieee80211_rssadapt.h revision 1.9.18.2 
      1 /*	$NetBSD: ieee80211_rssadapt.h,v 1.9.18.2 2018/06/28 21:23:01 phil Exp $ */
      2 
      3 /*-
      4  * SPDX-License-Identifier: BSD-3-Clause
      5  *
      6  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or
      9  * without modification, are permitted provided that the following
     10  * conditions are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above
     14  *    copyright notice, this list of conditions and the following
     15  *    disclaimer in the documentation and/or other materials provided
     16  *    with the distribution.
     17  * 3. The name of David Young may not be used to endorse or promote
     18  *    products derived from this software without specific prior
     19  *    written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
     22  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
     24  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
     25  * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
     27  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     29  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
     32  * OF SUCH DAMAGE.
     33  */
     34 #ifndef _NET80211_IEEE80211_RSSADAPT_H_
     35 #define _NET80211_IEEE80211_RSSADAPT_H_
     36 
     37 /* Data-rate adaptation loosely based on "Link Adaptation Strategy
     38  * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
     39  * by Javier del Prado Pavon and Sunghyun Choi.
     40  */
     41 
     42 /* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
     43 #define	IEEE80211_RSSADAPT_BKTS		3
     44 #define IEEE80211_RSSADAPT_BKT0		128
     45 #define	IEEE80211_RSSADAPT_BKTPOWER	3	/* 2**_BKTPOWER */
     46 
     47 struct ieee80211_rssadapt {
     48 	const struct ieee80211vap *vap;
     49 	int	interval;			/* update interval (ticks) */
     50 };
     51 
     52 struct ieee80211_rssadapt_node {
     53 	struct ieee80211_rssadapt *ra_rs;	/* backpointer */
     54 	struct ieee80211_rateset ra_rates;	/* negotiated rates */
     55 	int	ra_rix;				/* current rate index */
     56 	int	ra_ticks;			/* time of last update */
     57 	int	ra_last_raise;			/* time of last rate raise */
     58 	int	ra_raise_interval;		/* rate raise time threshold */
     59 
     60 	/* Tx failures in this update interval */
     61 	uint32_t		ra_nfail;
     62 	/* Tx successes in this update interval */
     63 	uint32_t		ra_nok;
     64 	/* exponential average packets/second */
     65 	uint32_t		ra_pktrate;
     66 	/* RSSI threshold for each Tx rate */
     67 	uint16_t		ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
     68 					      [IEEE80211_RATE_SIZE];
     69 };
     70 
     71 #define	IEEE80211_RSSADAPT_SUCCESS	1
     72 #define	IEEE80211_RSSADAPT_FAILURE	0
     73 #endif /* _NET80211_IEEE80211_RSSADAPT_H_ */
     74