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 46 struct ieee80211_rssadapt { 47 const struct ieee80211vap *vap; 48 int interval; /* update interval (ticks) */ 49 }; 50 51 struct 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