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Diffstat (limited to 'src/osmo-bts-lc15/utils.c')
| -rw-r--r-- | src/osmo-bts-lc15/utils.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/osmo-bts-lc15/utils.c b/src/osmo-bts-lc15/utils.c new file mode 100644 index 00000000..8d980ba8 --- /dev/null +++ b/src/osmo-bts-lc15/utils.c @@ -0,0 +1,118 @@ +/* Helper utilities that are used in OMLs */ + +/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com> + * + * Based on sysmoBTS: + * (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 "lc15bts.h" +#include "l1_if.h" + +int band_lc152osmo(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_osmo2lc15(struct gsm_bts_trx *trx, enum gsm_band osmo_band) +{ + struct lc15l1_hdl *fl1h = trx_lc15l1_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 lc15bts_select_lc15_band(struct gsm_bts_trx *trx, uint16_t arfcn) +{ + enum gsm_band band; + struct gsm_bts *bts = trx->bts; + int rc; + + if (!bts->auto_band) + return band_osmo2lc15(trx, bts->band); + + /* + * We need to check what will happen now. + */ + rc = gsm_arfcn2band_rc(arfcn, &band); + if (rc) /* wrong ARFCN, give up */ + return -1; + + /* if we are already on the right band return */ + if (band == bts->band) + return band_osmo2lc15(trx, bts->band); + + /* Check if it is GSM1800/GSM1900 */ + if (band == GSM_BAND_1800 && bts->band == GSM_BAND_1900) + return band_osmo2lc15(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_osmo2lc15(trx, band); + if (band == GSM_BAND_1800 && bts->band == GSM_BAND_850) + return band_osmo2lc15(trx, GSM_BAND_1900); + + /* give up */ + return -1; +} |