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/* Measurement Report 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 <errno.h>
#include <osmocom/bsc/gsm_data.h>
#include <osmocom/bsc/meas_rep.h>
int meas_get_field(const struct gsm_meas_rep *rep,
enum meas_rep_field field)
{
switch (field) {
case MEAS_REP_DL_RXLEV_FULL:
if (!(rep->flags & MEAS_REP_F_DL_VALID))
return -EINVAL;
/* Add BS Power value to rxlev: improve the RXLEV value by the amount of power that the BTS is reducing
* transmission. Note that bs_power is coded as dB, a positive value indicating the amount of power reduction
* on the downlink; rxlev is coded in dB, where a higher number means stronger signal. */
return rep->dl.full.rx_lev + rep->bs_power_db;
case MEAS_REP_DL_RXLEV_SUB:
if (!(rep->flags & MEAS_REP_F_DL_VALID))
return -EINVAL;
/* Apply BS Power as explained above */
return rep->dl.sub.rx_lev + rep->bs_power_db;
case MEAS_REP_DL_RXQUAL_FULL:
if (!(rep->flags & MEAS_REP_F_DL_VALID))
return -EINVAL;
return rep->dl.full.rx_qual;
case MEAS_REP_DL_RXQUAL_SUB:
if (!(rep->flags & MEAS_REP_F_DL_VALID))
return -EINVAL;
return rep->dl.sub.rx_qual;
case MEAS_REP_UL_RXLEV_FULL:
return rep->ul.full.rx_lev;
case MEAS_REP_UL_RXLEV_SUB:
return rep->ul.sub.rx_lev;
case MEAS_REP_UL_RXQUAL_FULL:
return rep->ul.full.rx_qual;
case MEAS_REP_UL_RXQUAL_SUB:
return rep->ul.sub.rx_qual;
}
return 0;
}
unsigned int calc_initial_idx(unsigned int array_size,
unsigned int meas_rep_idx,
unsigned int num_values)
{
int offs, idx;
/* from which element do we need to start if we're interested
* in an average of 'num' elements */
offs = meas_rep_idx - num_values;
if (offs < 0)
idx = array_size + offs;
else
idx = offs;
return idx;
}
static inline enum meas_rep_field choose_meas_rep_field(enum tdma_meas_field field, enum tdma_meas_dir dir,
enum tdma_meas_set set, const struct gsm_meas_rep *meas_rep)
{
if (set == TDMA_MEAS_SET_AUTO) {
bool dtx_in_use;
dtx_in_use = (meas_rep->flags & ((dir == TDMA_MEAS_DIR_UL) ? MEAS_REP_F_UL_DTX : MEAS_REP_F_DL_DTX));
set = (dtx_in_use ? TDMA_MEAS_SET_SUB : TDMA_MEAS_SET_FULL);
}
osmo_static_assert(TDMA_MEAS_FIELD_RXLEV >= 0 && TDMA_MEAS_FIELD_RXLEV <= 1
&& TDMA_MEAS_FIELD_RXQUAL >= 0 && TDMA_MEAS_FIELD_RXQUAL <= 1
&& TDMA_MEAS_DIR_UL >= 0 && TDMA_MEAS_DIR_UL <= 1
&& TDMA_MEAS_DIR_DL >= 0 && TDMA_MEAS_DIR_DL <= 1
&& TDMA_MEAS_SET_FULL >= 0 && TDMA_MEAS_SET_FULL <= 1
&& TDMA_MEAS_SET_SUB >= 0 && TDMA_MEAS_SET_SUB <= 1,
choose_meas_rep_field__mux_macro_input_ranges);
#define MUX(FIELD, DIR, SET) ((FIELD) + ((DIR) << 1) + ((SET) << 2))
switch (MUX(field, dir, set)) {
case MUX(TDMA_MEAS_FIELD_RXLEV, TDMA_MEAS_DIR_UL, TDMA_MEAS_SET_FULL):
return MEAS_REP_UL_RXLEV_FULL;
case MUX(TDMA_MEAS_FIELD_RXLEV, TDMA_MEAS_DIR_UL, TDMA_MEAS_SET_SUB):
return MEAS_REP_UL_RXLEV_SUB;
case MUX(TDMA_MEAS_FIELD_RXLEV, TDMA_MEAS_DIR_DL, TDMA_MEAS_SET_FULL):
return MEAS_REP_DL_RXLEV_FULL;
case MUX(TDMA_MEAS_FIELD_RXLEV, TDMA_MEAS_DIR_DL, TDMA_MEAS_SET_SUB):
return MEAS_REP_DL_RXLEV_SUB;
case MUX(TDMA_MEAS_FIELD_RXQUAL, TDMA_MEAS_DIR_UL, TDMA_MEAS_SET_FULL):
return MEAS_REP_UL_RXQUAL_FULL;
case MUX(TDMA_MEAS_FIELD_RXQUAL, TDMA_MEAS_DIR_UL, TDMA_MEAS_SET_SUB):
return MEAS_REP_UL_RXQUAL_SUB;
case MUX(TDMA_MEAS_FIELD_RXQUAL, TDMA_MEAS_DIR_DL, TDMA_MEAS_SET_FULL):
return MEAS_REP_DL_RXQUAL_FULL;
case MUX(TDMA_MEAS_FIELD_RXQUAL, TDMA_MEAS_DIR_DL, TDMA_MEAS_SET_SUB):
return MEAS_REP_DL_RXQUAL_SUB;
default:
OSMO_ASSERT(false);
}
#undef MUX
}
/* obtain an average over the last 'num' fields in the meas reps. For 'field', pass either DL_RXLEV or DL_RXQUAL, and
* by tdma_meas_set, choose between full, subset or automatic choice of set. */
int get_meas_rep_avg(const struct gsm_lchan *lchan,
enum tdma_meas_field field, enum tdma_meas_dir dir, enum tdma_meas_set set,
unsigned int num)
{
unsigned int i, idx;
int avg = 0, valid_num = 0;
if (num < 1)
return -EINVAL;
if (num > lchan->meas_rep_count)
return -EINVAL;
idx = calc_initial_idx(ARRAY_SIZE(lchan->meas_rep),
lchan->meas_rep_idx, num);
for (i = 0; i < num; i++) {
int j = (idx+i) % ARRAY_SIZE(lchan->meas_rep);
enum meas_rep_field use_field;
int val;
use_field = choose_meas_rep_field(field, dir, set, &lchan->meas_rep[j]);
val = meas_get_field(&lchan->meas_rep[j], use_field);
if (val >= 0) {
avg += val;
valid_num++;
}
}
if (valid_num == 0)
return -EINVAL;
return avg / valid_num;
}
/* Check if N out of M last values for FIELD are >= bd */
int meas_rep_n_out_of_m_be(const struct gsm_lchan *lchan,
enum tdma_meas_field field, enum tdma_meas_dir dir, enum tdma_meas_set set,
unsigned int n, unsigned int m, int be)
{
unsigned int i, idx;
int count = 0;
idx = calc_initial_idx(ARRAY_SIZE(lchan->meas_rep),
lchan->meas_rep_idx, m);
for (i = 0; i < m; i++) {
int j = (idx + i) % ARRAY_SIZE(lchan->meas_rep);
enum meas_rep_field use_field;
int val;
use_field = choose_meas_rep_field(field, dir, set, &lchan->meas_rep[j]);
val = meas_get_field(&lchan->meas_rep[j], use_field);
if (val >= be) /* implies that val < 0 will not count */
count++;
if (count >= n)
return 1;
}
return 0;
}
const struct value_string tdma_meas_set_names[] = {
{ TDMA_MEAS_SET_FULL, "full" },
{ TDMA_MEAS_SET_SUB, "subset" },
{ TDMA_MEAS_SET_AUTO, "auto" },
{}
};
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