diff options
Diffstat (limited to 'src/common/power_control.c')
| -rw-r--r-- | src/common/power_control.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/src/common/power_control.c b/src/common/power_control.c index d08ed5e5..d2a6c1dd 100644 --- a/src/common/power_control.c +++ b/src/common/power_control.c @@ -30,6 +30,11 @@ #include <osmo-bts/measurement.h> #include <osmo-bts/bts_model.h> #include <osmo-bts/l1sap.h> +#include <osmo-bts/power_control.h> + +/* how many dB do we raise/lower as maximum (1 ms power level = 2 dB) */ +#define MS_RAISE_MAX_DB 4 +#define MS_LOWER_MAX_DB 8 /*! compute the new MS POWER LEVEL communicated to the MS and store it in lchan. * \param lchan logical channel for which to compute (and in which to store) new power value. @@ -51,10 +56,6 @@ int lchan_ms_pwr_ctrl(struct gsm_lchan *lchan, if (lchan->ms_power_ctrl.fixed) return 0; - /* How many dBs measured power should be increased (+) or decreased (-) - to reach expected power. */ - diff = bts->ul_power_target - rxLevel; - current_dbm = ms_pwr_dbm(band, ms_power); if (current_dbm < 0) { LOGPLCHAN(lchan, DLOOP, LOGL_NOTICE, @@ -70,6 +71,18 @@ int lchan_ms_pwr_ctrl(struct gsm_lchan *lchan, return 0; } + /* How many dBs measured power should be increased (+) or decreased (-) + to reach expected power. */ + diff = bts->ul_power_target - rxLevel; + + /* don't ever change more than MS_{LOWER,RAISE}_MAX_DBM during one loop + iteration, i.e. reduce the speed at which the MS transmit power can + change. A higher value means a lower level (and vice versa) */ + if (diff > MS_RAISE_MAX_DB) + diff = MS_RAISE_MAX_DB; + else if (diff < -MS_LOWER_MAX_DB) + diff = -MS_LOWER_MAX_DB; + new_dbm = current_dbm + diff; /* Make sure new_dbm is never negative. ms_pwr_ctl_lvl() can later on |