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_ */ 74