1/* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */
2/*-
3 * SPDX-License-Identifier: BSD-3-Clause
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 * 3. The name of David Young may not be used to endorse or promote
17 *    products derived from this software without specific prior
18 *    written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL David
24 * Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
26 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31 * OF SUCH DAMAGE.
32 */
33#ifndef _NET80211_IEEE80211_RSSADAPT_H_
34#define _NET80211_IEEE80211_RSSADAPT_H_
35
36/* Data-rate adaptation loosely based on "Link Adaptation Strategy
37 * for IEEE 802.11 WLAN via Received Signal Strength Measurement"
38 * by Javier del Prado Pavon and Sunghyun Choi.
39 */
40
41/* Buckets for frames 0-128 bytes long, 129-1024, 1025-maximum. */
42#define	IEEE80211_RSSADAPT_BKTS		3
43#define IEEE80211_RSSADAPT_BKT0		128
44#define	IEEE80211_RSSADAPT_BKTPOWER	3	/* 2**_BKTPOWER */
45
46struct ieee80211_rssadapt {
47	const struct ieee80211vap *vap;
48	int	interval;			/* update interval (ticks) */
49};
50
51struct ieee80211_rssadapt_node {
52	struct ieee80211_rssadapt *ra_rs;	/* backpointer */
53	struct ieee80211_rateset ra_rates;	/* negotiated rates */
54	int	ra_rix;				/* current rate index */
55	int	ra_ticks;			/* time of last update */
56	int	ra_last_raise;			/* time of last rate raise */
57	int	ra_raise_interval;		/* rate raise time threshold */
58
59	/* Tx failures in this update interval */
60	uint32_t		ra_nfail;
61	/* Tx successes in this update interval */
62	uint32_t		ra_nok;
63	/* exponential average packets/second */
64	uint32_t		ra_pktrate;
65	/* RSSI threshold for each Tx rate */
66	uint16_t		ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
67					      [IEEE80211_RATE_SIZE];
68};
69
70#define	IEEE80211_RSSADAPT_SUCCESS	1
71#define	IEEE80211_RSSADAPT_FAILURE	0
72#endif /* _NET80211_IEEE80211_RSSADAPT_H_ */
73