meas_rep: utility function for processing of measurement reports
This provides two functions: get_meas_rep_avg() to obtain the sliding window average of one particular field, and meas_rep_n_out_of_m_be() to check if at least N out of M measurments are >= BE.
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#ifndef _MEAS_REP_H
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#define _MEAS_REP_H
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#define MRC_F_PROCESSED 0x0001
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/* extracted from a L3 measurement report IE */
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struct gsm_meas_rep_cell {
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u_int8_t rxlev;
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u_int8_t bsic;
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u_int16_t arfcn;
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unsigned int flags;
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};
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/* RX Level and RX Quality */
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@ -54,4 +57,28 @@ struct gsm_meas_rep {
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struct gsm_meas_rep_cell cell[6];
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};
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enum meas_rep_field {
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MEAS_REP_DL_RXLEV_FULL,
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MEAS_REP_DL_RXLEV_SUB,
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MEAS_REP_DL_RXQUAL_FULL,
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MEAS_REP_DL_RXQUAL_SUB,
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MEAS_REP_UL_RXLEV_FULL,
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MEAS_REP_UL_RXLEV_SUB,
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MEAS_REP_UL_RXQUAL_FULL,
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MEAS_REP_UL_RXQUAL_SUB,
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};
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/* obtain an average over the last 'num' fields in the meas reps */
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int get_meas_rep_avg(const struct gsm_lchan *lchan,
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enum meas_rep_field field, unsigned int num);
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/* Check if N out of M last values for FIELD are >= bd */
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int meas_rep_n_out_of_m_be(const struct gsm_lchan *lchan,
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enum meas_rep_field field,
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unsigned int n, unsigned int m, int be);
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unsigned int calc_initial_idx(unsigned int array_size,
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unsigned int meas_rep_idx,
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unsigned int num_values);
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#endif /* _MEAS_REP_H */
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@ -12,7 +12,7 @@ libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
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trau_frame.c trau_mux.c paging.c e1_config.c e1_input.c tlv_parser.c \
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input/misdn.c input/ipaccess.c signal.c gsm_utils.c talloc.c \
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talloc_ctx.c system_information.c bitvec.c rest_octets.c \
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handover_decision.c
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handover_decision.c meas_rep.c
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libmsc_a_SOURCES = gsm_subscriber.c db.c telnet_interface.c \
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mncc.c rtp_proxy.c gsm_04_08.c gsm_04_11.c transaction.c \
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@ -0,0 +1,114 @@
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/* Measurement Report 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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <sys/types.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/meas_rep.h>
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static int get_field(const struct gsm_meas_rep *rep,
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enum meas_rep_field field)
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{
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switch (field) {
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case MEAS_REP_DL_RXLEV_FULL:
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return rep->dl.full.rx_lev;
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case MEAS_REP_DL_RXLEV_SUB:
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return rep->dl.sub.rx_lev;
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case MEAS_REP_DL_RXQUAL_FULL:
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return rep->dl.full.rx_qual;
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case MEAS_REP_DL_RXQUAL_SUB:
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return rep->dl.sub.rx_qual;
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case MEAS_REP_UL_RXLEV_FULL:
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return rep->ul.full.rx_lev;
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case MEAS_REP_UL_RXLEV_SUB:
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return rep->ul.sub.rx_lev;
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case MEAS_REP_UL_RXQUAL_FULL:
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return rep->ul.full.rx_qual;
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case MEAS_REP_UL_RXQUAL_SUB:
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return rep->ul.sub.rx_qual;
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}
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return 0;
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}
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unsigned int calc_initial_idx(unsigned int array_size,
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unsigned int meas_rep_idx,
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unsigned int num_values)
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{
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int offs, idx;
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/* from which element do we need to start if we're interested
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* in an average of 'num' elements */
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offs = meas_rep_idx - num_values;
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if (offs < 0)
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idx = array_size + offs;
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else
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idx = offs;
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return idx;
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}
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/* obtain an average over the last 'num' fields in the meas reps */
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int get_meas_rep_avg(const struct gsm_lchan *lchan,
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enum meas_rep_field field, unsigned int num)
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{
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unsigned int i, idx;
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int avg = 0;
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idx = calc_initial_idx(ARRAY_SIZE(lchan->meas_rep),
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lchan->meas_rep_idx, num);
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for (i = 0; i < num; i++) {
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int j = (idx+i) % ARRAY_SIZE(lchan->meas_rep);
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avg += get_field(&lchan->meas_rep[j], field);
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}
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return avg / num;
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}
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/* Check if N out of M last values for FIELD are >= bd */
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int meas_rep_n_out_of_m_be(const struct gsm_lchan *lchan,
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enum meas_rep_field field,
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unsigned int n, unsigned int m, int be)
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{
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unsigned int i, idx;
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int count = 0;
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idx = calc_initial_idx(ARRAY_SIZE(lchan->meas_rep),
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lchan->meas_rep_idx, m);
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for (i = 0; i < m; i++) {
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int j = (idx + i) % ARRAY_SIZE(lchan->meas_rep);
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int val = get_field(&lchan->meas_rep[j], field);
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if (val >= be)
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count++;
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if (count >= n)
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return 1;
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}
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return 0;
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}
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