blob: be6051a8ce57a1bab42c7e1302c2e43f602fa886 (
plain)
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
* Helper utilities that are used in OML
*
* (C) 2011-2013 by Harald Welte <laforge@gnumonks.org>
* (C) 2013 by Holger Hans Peter Freyther
*
* 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 "utils.h"
#include <osmo-bts/bts.h>
#include <osmo-bts/gsm_data.h>
#include <osmo-bts/logging.h>
#include "femtobts.h"
#include "l1_if.h"
int band_femto2osmo(GsmL1_FreqBand_t band)
{
switch (band) {
case GsmL1_FreqBand_850:
return GSM_BAND_850;
case GsmL1_FreqBand_900:
return GSM_BAND_900;
case GsmL1_FreqBand_1800:
return GSM_BAND_1800;
case GsmL1_FreqBand_1900:
return GSM_BAND_1900;
default:
return -1;
}
}
static int band_osmo2femto(struct gsm_bts_trx *trx, enum gsm_band osmo_band)
{
struct femtol1_hdl *fl1h = trx_femtol1_hdl(trx);
/* check if the TRX hardware actually supports the given band */
if (!(fl1h->hw_info.band_support & osmo_band))
return -1;
/* if yes, convert from osmcoom style band definition to L1 band */
switch (osmo_band) {
case GSM_BAND_850:
return GsmL1_FreqBand_850;
case GSM_BAND_900:
return GsmL1_FreqBand_900;
case GSM_BAND_1800:
return GsmL1_FreqBand_1800;
case GSM_BAND_1900:
return GsmL1_FreqBand_1900;
default:
return -1;
}
}
/**
* Select the band that matches the ARFCN. In general the ARFCNs
* for GSM1800 and GSM1900 overlap and one needs to specify the
* rightband. When moving between GSM900/GSM1800 and GSM850/1900
* modifying the BTS configuration is a bit annoying. The auto-band
* configuration allows to ease with this transition.
*/
int sysmobts_select_femto_band(struct gsm_bts_trx *trx, uint16_t arfcn)
{
enum gsm_band band;
struct gsm_bts *bts = trx->bts;
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
if (!btsb->auto_band)
return band_osmo2femto(trx, bts->band);
/*
* We need to check what will happen now.
*/
band = gsm_arfcn2band(arfcn);
/* if we are already on the right band return */
if (band == bts->band)
return band_osmo2femto(trx, bts->band);
/* Check if it is GSM1800/GSM1900 */
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900)
return band_osmo2femto(trx, bts->band);
/*
* Now to the actual autobauding. We just want DCS/DCS and
* PCS/PCS for PCS we check for 850/1800 though
*/
if ((band == GSM_BAND_900 && bts->band == GSM_BAND_1800)
|| (band == GSM_BAND_1800 && bts->band == GSM_BAND_900)
|| (band == GSM_BAND_850 && bts->band == GSM_BAND_1900))
return band_osmo2femto(trx, band);
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_850)
return band_osmo2femto(trx, GSM_BAND_1900);
/* give up */
return -1;
}
|