Annotation of sys/net80211/ieee80211_rssadapt.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ieee80211_rssadapt.h,v 1.4 2007/06/16 13:17:05 damien Exp $ */
2: /* $NetBSD: ieee80211_rssadapt.h,v 1.3 2004/05/06 03:03:20 dyoung Exp $ */
3:
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: #define ieee80211_rssadapt_thresh_new \
47: (ieee80211_rssadapt_thresh_denom - ieee80211_rssadapt_thresh_old)
48: #define ieee80211_rssadapt_decay_new \
49: (ieee80211_rssadapt_decay_denom - ieee80211_rssadapt_decay_old)
50: #define ieee80211_rssadapt_avgrssi_new \
51: (ieee80211_rssadapt_avgrssi_denom - ieee80211_rssadapt_avgrssi_old)
52:
53: struct ieee80211_rssadapt_expavgctl {
54: /* RSS threshold decay. */
55: u_int rc_decay_denom;
56: u_int rc_decay_old;
57: /* RSS threshold update. */
58: u_int rc_thresh_denom;
59: u_int rc_thresh_old;
60: /* RSS average update. */
61: u_int rc_avgrssi_denom;
62: u_int rc_avgrssi_old;
63: };
64:
65: struct ieee80211_rssadapt {
66: /* exponential average RSSI << 8 */
67: u_int16_t ra_avg_rssi;
68: /* Tx failures in this update interval */
69: u_int32_t ra_nfail;
70: /* Tx successes in this update interval */
71: u_int32_t ra_nok;
72: /* exponential average packets/second */
73: u_int32_t ra_pktrate;
74: /* RSSI threshold for each Tx rate */
75: u_int16_t ra_rate_thresh[IEEE80211_RSSADAPT_BKTS]
76: [IEEE80211_RATE_SIZE];
77: struct timeval ra_last_raise;
78: struct timeval ra_raise_interval;
79: };
80:
81: /* Properties of a Tx packet, for link adaptation. */
82: struct ieee80211_rssdesc {
83: u_int id_len; /* Tx packet length */
84: u_int id_rateidx; /* index into ni->ni_rates */
85: struct ieee80211_node *id_node; /* destination STA MAC */
86: u_int8_t id_rssi; /* destination STA avg RSS @
87: * Tx time
88: */
89: };
90:
91: void ieee80211_rssadapt_updatestats(struct ieee80211_rssadapt *);
92: void ieee80211_rssadapt_input(struct ieee80211com *,
93: const struct ieee80211_node *, struct ieee80211_rssadapt *, int);
94: void ieee80211_rssadapt_lower_rate(struct ieee80211com *,
95: const struct ieee80211_node *, struct ieee80211_rssadapt *,
96: const struct ieee80211_rssdesc *);
97: void ieee80211_rssadapt_raise_rate(struct ieee80211com *,
98: struct ieee80211_rssadapt *, const struct ieee80211_rssdesc *);
99: int ieee80211_rssadapt_choose(struct ieee80211_rssadapt *,
100: const struct ieee80211_rateset *, const struct ieee80211_frame *,
101: u_int, int, const char *, int);
102: #ifdef IEEE80211_DEBUG
103: extern int ieee80211_rssadapt_debug;
104: #endif /* IEEE80211_DEBUG */
105:
106: #endif /* _NET80211_IEEE80211_RSSADAPT_H_ */
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