diff options
Diffstat (limited to 'src/common/gsm_data.c')
| -rw-r--r-- | src/common/gsm_data.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/common/gsm_data.c b/src/common/gsm_data.c index 09664e24..9afb61ed 100644 --- a/src/common/gsm_data.c +++ b/src/common/gsm_data.c @@ -280,6 +280,54 @@ uint8_t gsm_lchan_as_pchan2chan_nr(const struct gsm_lchan *lchan, return gsm_pchan2chan_nr(as_pchan, lchan->ts->nr, lchan->nr); } +/* Called by the model specific code every 104 TDMA frames (SACCH period) */ +void gsm_lchan_interf_meas_push(struct gsm_lchan *lchan, int dbm) +{ + const uint8_t meas_num = lchan->meas.interf_meas_num; + + if (meas_num >= ARRAY_SIZE(lchan->meas.interf_meas_dbm)) { + LOGPLCHAN(lchan, DL1C, LOGL_ERROR, "Not enough room " + "to store interference report (%ddBm)\n", dbm); + return; + } + + lchan->meas.interf_meas_dbm[meas_num] = dbm; + lchan->meas.interf_meas_num++; +} + +/* Called by the higher layers every Intave * 104 TDMA frames */ +int gsm_lchan_interf_meas_calc_band(struct gsm_lchan *lchan) +{ + const uint8_t meas_num = lchan->meas.interf_meas_num; + const struct gsm_bts *bts = lchan->ts->trx->bts; + int b, meas_avg, meas_sum = 0; + + /* There must be at least one sample */ + if (meas_num == 0) + return -EAGAIN; + + /* Calculate the sum of all collected samples (in -x dBm) */ + while (lchan->meas.interf_meas_num) { + uint8_t i = --lchan->meas.interf_meas_num; + meas_sum += lchan->meas.interf_meas_dbm[i]; + } + + /* Calculate the average of all collected samples */ + meas_avg = meas_sum / (int) meas_num; + + /* Determine the band using interference boundaries from BSC */ + for (b = 0; b < ARRAY_SIZE(bts->interference.boundary); b++) { + if (meas_avg >= bts->interference.boundary[b]) + break; /* Current 'b' is the band value */ + } + + LOGPLCHAN(lchan, DL1C, LOGL_DEBUG, + "Interference AVG: %ddBm (band %d)\n", + meas_avg, b); + + return b; +} + /* determine logical channel based on TRX and channel number IE */ struct gsm_lchan *rsl_lchan_lookup(struct gsm_bts_trx *trx, uint8_t chan_nr, int *rc) |