1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* Support for generating RSL Load Indication */
/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/msgb.h>
#include <osmo-bts/gsm_data.h>
#include <osmo-bts/rsl.h>
#include <osmo-bts/paging.h>
static void reset_load_counters(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
/* re-set the counters */
btsb->load.ccch.pch_used = btsb->load.ccch.pch_total = 0;
}
static void load_timer_cb(void *data)
{
struct gsm_bts *bts = data;
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
unsigned int pch_percent, rach_percent;
/* compute percentages */
if (btsb->load.ccch.pch_total == 0)
pch_percent = 0;
else
pch_percent = (btsb->load.ccch.pch_used * 100) /
btsb->load.ccch.pch_total;
if (pch_percent >= btsb->load.ccch.load_ind_thresh) {
/* send RSL load indication message to BSC */
uint16_t buffer_space = paging_buffer_space(btsb->paging_state);
rsl_tx_ccch_load_ind_pch(bts, buffer_space);
} else {
/* This is an extenstion of TS 08.58. We don't only
* send load indications if the load is above threshold,
* but we also explicitly indicate that we are below
* threshold by using the magic value 0xffff */
rsl_tx_ccch_load_ind_pch(bts, 0xffff);
}
if (btsb->load.rach.total == 0)
rach_percent = 0;
else
rach_percent = (btsb->load.rach.busy * 100) /
btsb->load.rach.total;
if (rach_percent >= btsb->load.ccch.load_ind_thresh) {
/* send RSL load indication message to BSC */
rsl_tx_ccch_load_ind_rach(bts, btsb->load.rach.total,
btsb->load.rach.busy,
btsb->load.rach.access);
}
reset_load_counters(bts);
/* re-schedule the timer */
osmo_timer_schedule(&btsb->load.ccch.timer,
btsb->load.ccch.load_ind_period, 0);
}
void load_timer_start(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
btsb->load.ccch.timer.data = bts;
btsb->load.ccch.timer.cb = load_timer_cb;
reset_load_counters(bts);
osmo_timer_schedule(&btsb->load.ccch.timer,
btsb->load.ccch.load_ind_period, 0);
}
void load_timer_stop(struct gsm_bts *bts)
{
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
osmo_timer_del(&btsb->load.ccch.timer);
}
|