88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
|
|
* Helper utilities that are used in OML
|
|
*
|
|
* (C) 2011 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 "femtobts.h"
|
|
|
|
static int band_osmo2femto(enum gsm_band osmo_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 *bts, uint16_t arfcn)
|
|
{
|
|
enum gsm_band band;
|
|
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
|
|
|
|
if (!btsb->auto_band)
|
|
return band_osmo2femto(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(bts->band);
|
|
|
|
/* Check if it is GSM1800/GSM1900 */
|
|
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900)
|
|
return band_osmo2femto(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(band);
|
|
if (band == GSM_BAND_1800 && bts->band == GSM_BAND_850)
|
|
return band_osmo2femto(GSM_BAND_1900);
|
|
|
|
/* give up */
|
|
return -1;
|
|
}
|