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-rw-r--r--openbsc/src/libbsc/meas_proc.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/openbsc/src/libbsc/meas_proc.c b/openbsc/src/libbsc/meas_proc.c
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index 000000000..ade1f2e0c
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+++ b/openbsc/src/libbsc/meas_proc.c
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+/* Measurement Processing */
+
+/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ *
+ * 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 Affero 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 <stdlib.h>
+#include <errno.h>
+
+#include <osmocore/talloc.h>
+#include <osmocore/msgb.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/meas_rep.h>
+#include <openbsc/signal.h>
+
+/* process an already parsed measurement report */
+static int process_meas_rep(struct gsm_meas_rep *mr)
+{
+ struct gsm_meas_rep_cell *mr_cell = NULL;
+ unsigned int best_better_db;
+ int i;
+
+ /* FIXME: implement actual averaging over multiple measurement
+ * reports */
+
+ /* find the best cell in this report that is at least RXLEV_HYST
+ * better than the current serving cell */
+ for (i = 0; i < mr->num_cell; i++) {
+ unsigned int better;
+ if (mr->cell[i].rxlev < mr->dl.full.rx_lev + RXLEV_HYST)
+ continue;
+
+ better = mr->cell[i].rxlev - mr->dl.full.rx_lev;
+ if (better > best_better_db) {
+ mr_cell = &mr->cell[i];
+ best_better_db = better;
+ }
+ }
+
+ if (mr_cell)
+ return handover_to_arfcn_bsic(mr->lchan, mr_cell->arfcn,
+ mr_cell->bsic);
+ return 0;
+}
+
+static int meas_proc_sig_cb(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data)
+{
+ struct gsm_lchan *lchan;
+ struct gsm_meas_rep *mr;
+
+ if (subsys != SS_LCHAN)
+ return 0;
+
+ switch (signal) {
+ case S_LCHAN_MEAS_REP:
+ mr = signal_data;
+ process_meas_rep(mr);
+ break;
+ }
+
+ return 0;
+}
+
+static __attribute__((constructor)) void on_dso_load_meas(void)
+{
+ register_signal_handler(SS_LCHAN, meas_proc_sig_cb, NULL);
+}