1/*	$FreeBSD: releng/12.0/sys/net80211/ieee80211_rssadapt.h 326272 2017-11-27 15:23:17Z pfg $	*/
2/* $NetBSD: ieee80211_rssadapt.h,v 1.4 2005/02/26 22:45:09 perry Exp $ */
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
47struct ieee80211_rssadapt {
48	const struct ieee80211vap *vap;
49	int	interval;			/* update interval (ticks) */
50};
51
52struct 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