119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* Helper utilities that are used in OMLs */
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/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com>
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*
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* Based on sysmoBTS:
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* (C) 2011-2013 by Harald Welte <laforge@gnumonks.org>
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* (C) 2013 by Holger Hans Peter Freyther
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "utils.h"
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#include <osmo-bts/bts.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/logging.h>
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#include "oc2gbts.h"
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#include "l1_if.h"
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int band_oc2g2osmo(GsmL1_FreqBand_t band)
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{
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switch (band) {
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case GsmL1_FreqBand_850:
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return GSM_BAND_850;
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case GsmL1_FreqBand_900:
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return GSM_BAND_900;
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case GsmL1_FreqBand_1800:
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return GSM_BAND_1800;
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case GsmL1_FreqBand_1900:
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return GSM_BAND_1900;
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default:
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return -1;
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}
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}
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static int band_osmo2oc2g(struct gsm_bts_trx *trx, enum gsm_band osmo_band)
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{
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struct oc2gl1_hdl *fl1h = trx_oc2gl1_hdl(trx);
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/* check if the TRX hardware actually supports the given band */
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if (!(fl1h->hw_info.band_support & osmo_band))
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return -1;
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/* if yes, convert from osmcoom style band definition to L1 band */
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switch (osmo_band) {
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case GSM_BAND_850:
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return GsmL1_FreqBand_850;
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case GSM_BAND_900:
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return GsmL1_FreqBand_900;
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case GSM_BAND_1800:
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return GsmL1_FreqBand_1800;
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case GSM_BAND_1900:
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return GsmL1_FreqBand_1900;
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default:
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return -1;
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}
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}
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/**
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* Select the band that matches the ARFCN. In general the ARFCNs
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* for GSM1800 and GSM1900 overlap and one needs to specify the
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* rightband. When moving between GSM900/GSM1800 and GSM850/1900
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* modifying the BTS configuration is a bit annoying. The auto-band
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* configuration allows to ease with this transition.
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*/
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int oc2gbts_select_oc2g_band(struct gsm_bts_trx *trx, uint16_t arfcn)
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{
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enum gsm_band band;
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struct gsm_bts *bts = trx->bts;
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int rc;
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if (!bts->auto_band)
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return band_osmo2oc2g(trx, bts->band);
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/*
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* We need to check what will happen now.
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*/
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rc = gsm_arfcn2band_rc(arfcn, &band);
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if (rc) /* wrong ARFCN, give up */
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return -1;
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/* if we are already on the right band return */
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if (band == bts->band)
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return band_osmo2oc2g(trx, bts->band);
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/* Check if it is GSM1800/GSM1900 */
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if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900)
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return band_osmo2oc2g(trx, bts->band);
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/*
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* Now to the actual autobauding. We just want DCS/DCS and
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* PCS/PCS for PCS we check for 850/1800 though
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*/
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if ((band == GSM_BAND_900 && bts->band == GSM_BAND_1800)
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|| (band == GSM_BAND_1800 && bts->band == GSM_BAND_900)
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|| (band == GSM_BAND_850 && bts->band == GSM_BAND_1900))
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return band_osmo2oc2g(trx, band);
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if (band == GSM_BAND_1800 && bts->band == GSM_BAND_850)
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return band_osmo2oc2g(trx, GSM_BAND_1900);
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/* give up */
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return -1;
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}
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