85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* Measurement Processing */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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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 Affero 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 <stdlib.h>
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#include <errno.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/msgb.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/meas_rep.h>
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#include <openbsc/signal.h>
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/* process an already parsed measurement report */
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static int process_meas_rep(struct gsm_meas_rep *mr)
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{
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struct gsm_meas_rep_cell *mr_cell = NULL;
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unsigned int best_better_db;
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int i;
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/* FIXME: implement actual averaging over multiple measurement
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* reports */
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/* find the best cell in this report that is at least RXLEV_HYST
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* better than the current serving cell */
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for (i = 0; i < mr->num_cell; i++) {
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unsigned int better;
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if (mr->cell[i].rxlev < mr->dl.full.rx_lev + RXLEV_HYST)
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continue;
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better = mr->cell[i].rxlev - mr->dl.full.rx_lev;
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if (better > best_better_db) {
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mr_cell = &mr->cell[i];
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best_better_db = better;
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}
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}
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if (mr_cell)
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return handover_to_arfcn_bsic(mr->lchan, mr_cell->arfcn,
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mr_cell->bsic);
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return 0;
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}
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static int meas_proc_sig_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct gsm_lchan *lchan;
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struct gsm_meas_rep *mr;
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if (subsys != SS_LCHAN)
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return 0;
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switch (signal) {
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case S_LCHAN_MEAS_REP:
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mr = signal_data;
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process_meas_rep(mr);
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break;
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}
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return 0;
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}
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static __attribute__((constructor)) void on_dso_load_meas(void)
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{
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osmo_signal_register_handler(SS_LCHAN, meas_proc_sig_cb, NULL);
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}
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