100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* MS Power Control Loop L1 */
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/* (C) 2014 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 <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <osmo-bts/logging.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/measurement.h>
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#include <osmo-bts/bts_model.h>
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#include <osmo-bts/l1sap.h>
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/*
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* Check if manual power control is needed
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* Check if fixed power was selected
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* Check if the MS is already using our level if not
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* the value is bogus..
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* TODO: Add a timeout.. e.g. if the ms is not capable of reaching
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* the value we have set.
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*/
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int lchan_ms_pwr_ctrl(struct gsm_lchan *lchan,
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const uint8_t ms_power, const int rxLevel)
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{
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int rx;
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int cur_dBm, new_dBm, new_pwr;
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struct gsm_bts *bts = lchan->ts->trx->bts;
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struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
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const enum gsm_band band = bts->band;
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if (!trx_ms_pwr_ctrl_is_osmo(lchan->ts->trx))
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return 0;
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if (lchan->ms_power_ctrl.fixed)
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return 0;
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/* The phone hasn't reached the power level yet */
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if (lchan->ms_power_ctrl.current != ms_power)
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return 0;
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/*
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* What is the difference between what we want and received?
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* Ignore a margin that is within the range of measurement
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* and MS output issues.
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*/
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rx = btsb->ul_power_target - rxLevel;
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if (rx >= 0 && rx < 1)
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return 0;
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if (rx < 0 && rx > -1)
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return 0;
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/* We don't really care about the truncation of int + float */
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cur_dBm = ms_pwr_dbm(band, ms_power);
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new_dBm = cur_dBm + rx;
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/* Clamp negative values and do it depending on the band */
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if (new_dBm < 0)
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new_dBm = 0;
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switch (band) {
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case GSM_BAND_1800:
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/* If MS_TX_PWR_MAX_CCH is set the values 29,
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* 30, 31 are not used. Avoid specifying a dBm
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* that would lead to these power levels. The
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* phone might not be able to reach them. */
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if (new_dBm > 30)
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new_dBm = 30;
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break;
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default:
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break;
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}
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new_pwr = ms_pwr_ctl_lvl(band, new_dBm);
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if (lchan->ms_power_ctrl.current != new_pwr) {
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lchan->ms_power_ctrl.current = new_pwr;
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bts_model_adjst_ms_pwr(lchan);
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return 1;
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}
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return 0;
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}
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