| 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_ */ |