1 /* $FreeBSD$ */
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
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_ */
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