576 lines
22 KiB
C
576 lines
22 KiB
C
/* MS Power Control Loop L1 */
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/* (C) 2014 by Holger Hans Peter Freyther
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* (C) 2020-2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/measurement.h>
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#include <osmo-bts/bts_model.h>
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#include <osmo-bts/l1sap.h>
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#include <osmo-bts/power_control.h>
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/* We don't want to deal with floating point, so we scale up */
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#define EWMA_SCALE_FACTOR 100
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/* EWMA_SCALE_FACTOR/2 = +50: Round to nearest value when downscaling, otherwise floor() is applied. */
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#define EWMA_ROUND_FACTOR (EWMA_SCALE_FACTOR / 2)
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/* Base Low-Pass Single-Pole IIR Filter (EWMA) formula:
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*
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* Avg[n] = a * Val[n] + (1 - a) * Avg[n - 1]
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*
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* where parameter 'a' determines how much weight of the latest measurement value
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* 'Val[n]' carries vs the weight of the accumulated average 'Avg[n - 1]'. The
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* value of 'a' is usually a float in range 0 .. 1, so:
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*
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* - value 0.5 gives equal weight to both 'Val[n]' and 'Avg[n - 1]';
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* - value 1.0 means no filtering at all (pass through);
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* - value 0.0 makes no sense.
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*
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* Further optimization:
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*
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* Avg[n] = a * Val[n] + Avg[n - 1] - a * Avg[n - 1]
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* ^^^^^^ ^^^^^^^^^^
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*
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* a) this can be implemented in C using '+=' operator:
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*
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* Avg += a * Val - a * Avg
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* Avg += a * (Val - Avg)
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*
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* b) everything is scaled up by 100 to avoid floating point stuff:
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*
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* Avg100 += A * (Val - Avg)
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*
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* where 'Avg100' is 'Avg * 100' and 'A' is 'a * 100'.
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*
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* For more details, see:
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*
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* https://en.wikipedia.org/wiki/Moving_average
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* https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter
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* https://tomroelandts.com/articles/low-pass-single-pole-iir-filter
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*/
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static int do_pf_ewma(const struct gsm_power_ctrl_meas_params *mp,
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struct gsm_power_ctrl_meas_proc_state *mps,
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const int Val)
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{
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const uint8_t A = mp->ewma.alpha;
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int *Avg100 = &mps->ewma.Avg100;
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/* We don't have 'Avg[n - 1]' if this is the first run */
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if (mps->meas_num++ == 0) {
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*Avg100 = Val * EWMA_SCALE_FACTOR;
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return Val;
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}
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*Avg100 += A * (Val - (*Avg100 + EWMA_ROUND_FACTOR) / EWMA_SCALE_FACTOR);
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return (*Avg100 + EWMA_ROUND_FACTOR) / EWMA_SCALE_FACTOR;
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}
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/* Calculate target RxLev value from lower/upper thresholds */
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#define CALC_TARGET(mp) \
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((mp).lower_thresh + (mp).upper_thresh) / 2
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static int do_avg_algo(const struct gsm_power_ctrl_meas_params *mp,
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struct gsm_power_ctrl_meas_proc_state *mps,
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const int val)
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{
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int val_avg;
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switch (mp->algo) {
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case GSM_PWR_CTRL_MEAS_AVG_ALGO_OSMO_EWMA:
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val_avg = do_pf_ewma(mp, mps, val);
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break;
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/* TODO: implement other pre-processing methods */
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case GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE:
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default:
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/* No filtering (pass through) */
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val_avg = val;
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}
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return val_avg;
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}
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/* Calculate a 'delta' value (for the given MS/BS power control parameters)
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* to be applied to the current Tx power level to approach the target level. */
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static int calc_delta_rxlev(const struct gsm_power_ctrl_params *params, const uint8_t rxlev)
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{
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int delta;
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/* Check if RxLev is within the threshold window */
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if (rxlev >= params->rxlev_meas.lower_thresh &&
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rxlev <= params->rxlev_meas.upper_thresh)
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return 0;
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/* How many dBs measured power should be increased (+) or decreased (-)
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* to reach expected power. */
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delta = CALC_TARGET(params->rxlev_meas) - rxlev;
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/* Don't ever change more than PWR_{LOWER,RAISE}_MAX_DBM during one loop
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* iteration, i.e. reduce the speed at which the MS transmit power can
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* change. A higher value means a lower level (and vice versa) */
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if (delta > params->inc_step_size_db)
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delta = params->inc_step_size_db;
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else if (delta < -params->red_step_size_db)
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delta = -params->red_step_size_db;
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return delta;
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}
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/* Shall we skip current block based on configured interval? */
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static bool ctrl_interval_skip_block(const struct gsm_power_ctrl_params *params,
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struct lchan_power_ctrl_state *state)
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{
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/* Power control interval: how many blocks do we skip? */
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if (state->skip_block_num-- > 0)
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return true;
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/* Reset the number of SACCH blocks to be skipped:
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* ctrl_interval=0 => 0 blocks to skip,
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* ctrl_interval=1 => 1 blocks to skip,
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* ctrl_interval=2 => 3 blocks to skip,
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* so basically ctrl_interval * 2 - 1. */
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state->skip_block_num = params->ctrl_interval * 2 - 1;
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return false;
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}
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static const struct gsm_power_ctrl_meas_params *lchan_get_ci_thresholds(const struct gsm_lchan *lchan)
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{
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const struct gsm_power_ctrl_params *params = lchan->ms_power_ctrl.dpc_params;
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switch (lchan->type) {
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case GSM_LCHAN_SDCCH:
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return ¶ms->ci_sdcch_meas;
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case GSM_LCHAN_PDTCH:
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return ¶ms->ci_gprs_meas;
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case GSM_LCHAN_TCH_F:
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if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR)
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return ¶ms->ci_amr_fr_meas;
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else
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return ¶ms->ci_fr_meas;
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case GSM_LCHAN_TCH_H:
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if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR)
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return ¶ms->ci_amr_hr_meas;
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else
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return ¶ms->ci_hr_meas;
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default:
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OSMO_ASSERT(0);
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}
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}
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/*! compute the new MS POWER LEVEL communicated to the MS and store it in lchan.
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* \param lchan logical channel for which to compute (and in which to store) new power value.
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* \param[in] ms_power_lvl MS Power Level received from Uplink L1 SACCH Header in SACCH block.
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* \param[in] ul_rssi_dbm Signal level of the received SACCH block, in dBm.
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* \param[in] ul_lqual_cb C/I of the received SACCH block, in dB.
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*/
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int lchan_ms_pwr_ctrl(struct gsm_lchan *lchan,
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const uint8_t ms_power_lvl,
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const int8_t ul_rssi_dbm,
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const int16_t ul_lqual_cb)
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{
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struct lchan_power_ctrl_state *state = &lchan->ms_power_ctrl;
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const struct gsm_power_ctrl_params *params = state->dpc_params;
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struct gsm_bts_trx *trx = lchan->ts->trx;
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struct gsm_bts *bts = trx->bts;
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enum gsm_band band = bts->band;
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int8_t new_power_lvl; /* TS 05.05 power level */
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int8_t ms_dbm, new_dbm, current_dbm, bsc_max_dbm;
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uint8_t rxlev_avg;
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int16_t ul_lqual_cb_avg;
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const struct gsm_power_ctrl_meas_params *ci_meas;
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bool ignore, ci_on;
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if (!trx_ms_pwr_ctrl_is_osmo(trx))
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return 0;
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if (params == NULL)
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return 0;
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/* Shall we skip current block based on configured interval? */
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if (ctrl_interval_skip_block(params, state))
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return 0;
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ms_dbm = ms_pwr_dbm(band, ms_power_lvl);
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if (ms_dbm < 0) {
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LOGPLCHAN(lchan, DLOOP, LOGL_NOTICE,
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"Failed to calculate dBm for power ctl level %" PRIu8 " on band %s\n",
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ms_power_lvl, gsm_band_name(band));
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return 0;
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}
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bsc_max_dbm = ms_pwr_dbm(band, state->max);
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if (bsc_max_dbm < 0) {
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LOGPLCHAN(lchan, DLOOP, LOGL_NOTICE,
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"Failed to calculate dBm for power ctl level %" PRIu8 " on band %s\n",
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state->max, gsm_band_name(band));
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return 0;
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}
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ci_meas = lchan_get_ci_thresholds(lchan);
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/* Is C/I based algo enabled by config?
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* FIXME: this can later be generalized when properly implementing P & N counting. */
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ci_on = ci_meas->lower_cmp_n && ci_meas->upper_cmp_n;
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ul_lqual_cb_avg = do_avg_algo(ci_meas, &state->ci_meas_proc, ul_lqual_cb);
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rxlev_avg = do_avg_algo(¶ms->rxlev_meas, &state->rxlev_meas_proc, dbm2rxlev(ul_rssi_dbm));
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/* If computed C/I is enabled and out of acceptable thresholds: */
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if (ci_on && ul_lqual_cb_avg < ci_meas->lower_thresh * 10) {
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new_dbm = ms_dbm + params->inc_step_size_db;
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} else if (ci_on && ul_lqual_cb_avg > ci_meas->upper_thresh * 10) {
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new_dbm = ms_dbm - params->red_step_size_db;
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} else {
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/* Calculate the new Tx power value (in dBm) */
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new_dbm = ms_dbm + calc_delta_rxlev(params, rxlev_avg);
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}
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/* Make sure new_dbm is never negative. ms_pwr_ctl_lvl() can later on
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cope with any unsigned dbm value, regardless of band minimal value. */
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if (new_dbm < 0)
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new_dbm = 0;
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/* Don't ask for smaller ms power level than the one set by BSC upon RSL CHAN ACT */
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if (new_dbm > bsc_max_dbm)
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new_dbm = bsc_max_dbm;
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new_power_lvl = ms_pwr_ctl_lvl(band, new_dbm);
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if (new_power_lvl < 0) {
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LOGPLCHAN(lchan, DLOOP, LOGL_NOTICE,
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"Failed to retrieve power level for %" PRId8 " dBm on band %d\n",
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new_dbm, band);
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return 0;
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}
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current_dbm = ms_pwr_dbm(band, state->current);
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/* In this Power Control Loop, we infer a new good MS Power Level based
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* on the previous MS Power Level announced by the MS (not the previous
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* one we requested!) together with the related computed measurements.
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* Hence, and since we allow for several good MS Power Levels falling into our
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* thresholds, we could finally converge into an oscillation loop where
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* the MS bounces between 2 different correct MS Power levels all the
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* time, due to the fact that we "accept" and "request back" whatever
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* good MS Power Level we received from the MS, but at that time the MS
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* will be transmitting using the previous MS Power Level we
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* requested, which we will later "accept" and "request back" on next loop
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* iteration. As a result MS effectively bounces between those 2 MS
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* Power Levels.
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* In order to fix this permanent oscillation, if current MS_PWR used/announced
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* by MS is good ("ms_dbm == new_dbm", hence within thresholds and no change
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* required) but has higher Tx power than the one we last requested, we ignore
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* it and keep requesting for one with lower Tx power. This way we converge to
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* the lowest good Tx power avoiding oscillating over values within thresholds.
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*/
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ignore = (ms_dbm == new_dbm && ms_dbm > current_dbm);
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if (state->current == new_power_lvl || ignore) {
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LOGPLCHAN(lchan, DLOOP, LOGL_INFO, "Keeping MS power at control level %d (%d dBm): "
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"ms-pwr-lvl[curr %" PRIu8 ", max %" PRIu8 "], RSSI[curr %d, avg %d, thresh %d..%d] dBm,"
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" C/I[curr %d, avg %d, thresh %d..%d] dB\n",
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new_power_lvl, new_dbm, ms_power_lvl, state->max, ul_rssi_dbm, rxlev2dbm(rxlev_avg),
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rxlev2dbm(params->rxlev_meas.lower_thresh), rxlev2dbm(params->rxlev_meas.upper_thresh),
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ul_lqual_cb/10, ul_lqual_cb_avg/10, ci_meas->lower_thresh, ci_meas->upper_thresh);
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return 0;
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}
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LOGPLCHAN(lchan, DLOOP, LOGL_INFO, "%s MS power control level %d (%d dBm) => %d (%d dBm): "
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"ms-pwr-lvl[curr %" PRIu8 ", max %" PRIu8 "], RSSI[curr %d, avg %d, thresh %d..%d] dBm,"
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" C/I[curr %d, avg %d, thresh %d..%d] dB\n",
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(new_dbm > current_dbm) ? "Raising" : "Lowering",
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state->current, current_dbm, new_power_lvl, new_dbm, ms_power_lvl,
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state->max, ul_rssi_dbm, rxlev2dbm(rxlev_avg),
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rxlev2dbm(params->rxlev_meas.lower_thresh), rxlev2dbm(params->rxlev_meas.upper_thresh),
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ul_lqual_cb/10, ul_lqual_cb_avg/10, ci_meas->lower_thresh, ci_meas->upper_thresh);
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/* store the resulting new MS power level in the lchan */
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state->current = new_power_lvl;
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bts_model_adjst_ms_pwr(lchan);
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return 1;
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}
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/*! compute the new Downlink attenuation value for the given logical channel.
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* \param lchan logical channel for which to compute (and in which to store) new power value.
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* \param[in] mr pointer to a *valid* Measurement Report.
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*/
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int lchan_bs_pwr_ctrl(struct gsm_lchan *lchan,
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const struct gsm48_meas_res *mr)
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{
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struct lchan_power_ctrl_state *state = &lchan->bs_power_ctrl;
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const struct gsm_power_ctrl_params *params = state->dpc_params;
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uint8_t rxqual, rxqual_avg, rxlev, rxlev_avg;
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int new_att;
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/* Check if dynamic BS Power Control is enabled */
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if (params == NULL)
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return 0;
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Rx DL Measurement Report: "
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"RXLEV-FULL(%02u), RXQUAL-FULL(%u), "
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"RXLEV-SUB(%02u), RXQUAL-SUB(%u), "
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"DTx is %s => using %s\n",
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mr->rxlev_full, mr->rxqual_full,
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mr->rxlev_sub, mr->rxqual_sub,
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lchan->tch.dtx.dl_active ? "enabled" : "disabled",
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lchan->tch.dtx.dl_active ? "SUB" : "FULL");
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/* Shall we skip current block based on configured interval? */
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if (ctrl_interval_skip_block(params, state))
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return 0;
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/* If DTx is active on Downlink, use the '-SUB' */
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if (lchan->tch.dtx.dl_active) {
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rxqual = mr->rxqual_sub;
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rxlev = mr->rxlev_sub;
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} else { /* ... otherwise use the '-FULL' */
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rxqual = mr->rxqual_full;
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rxlev = mr->rxlev_full;
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}
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rxlev_avg = do_avg_algo(¶ms->rxlev_meas, &state->rxlev_meas_proc, rxlev);
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rxqual_avg = do_avg_algo(¶ms->rxqual_meas, &state->rxqual_meas_proc, rxqual);
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/* If RxQual > L_RXQUAL_XX_P, try to increase Tx power */
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if (rxqual_avg > params->rxqual_meas.lower_thresh) {
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/* Increase Tx power by reducing Tx attenuation */
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new_att = state->current - params->inc_step_size_db;
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} else if (rxqual_avg < params->rxqual_meas.upper_thresh) {
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/* Increase Tx power by Increasing Tx attenuation */
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new_att = state->current + params->red_step_size_db;
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} else {
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/* Basic signal transmission / reception formula:
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*
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* RxLev = TxPwr - (PathLoss + TxAtt)
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*
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* Here we want to change RxLev at the MS side, so:
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*
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* RxLev + Delta = TxPwr - (PathLoss + TxAtt) + Delta
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*
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* The only parameter we can change here is TxAtt, so:
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*
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* RxLev + Delta = TxPwr - PathLoss - TxAtt + Delta
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* RxLev + Delta = TxPwr - PathLoss - (TxAtt - Delta)
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*/
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new_att = state->current - calc_delta_rxlev(params, rxlev_avg);
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}
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/* Make sure new TxAtt is never negative: */
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if (new_att < 0)
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new_att = 0;
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/* Don't ask for higher TxAtt than permitted: */
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if (new_att > state->max)
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new_att = state->max;
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if (state->current == new_att) {
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LOGPLCHAN(lchan, DLOOP, LOGL_INFO, "Keeping DL attenuation at %u dB: "
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"max %u dB, RSSI[curr %d, avg %d, thresh %d..%d] dBm, "
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"RxQual[curr %d, avg %d, thresh %d..%d]\n",
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state->current, state->max, rxlev2dbm(rxlev), rxlev2dbm(rxlev_avg),
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rxlev2dbm(params->rxlev_meas.lower_thresh), rxlev2dbm(params->rxlev_meas.upper_thresh),
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rxqual, rxqual_avg, params->rxqual_meas.lower_thresh, params->rxqual_meas.upper_thresh);
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return 0;
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}
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LOGPLCHAN(lchan, DLOOP, LOGL_INFO, "%s DL attenuation %u dB => %u dB:"
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"max %u dB, RSSI[curr %d, avg %d, thresh %d..%d] dBm, "
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"RxQual[curr %d, avg %d, thresh %d..%d]\n",
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(new_att > state->current) ? "Raising" : "Lowering",
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state->current, new_att, state->max, rxlev2dbm(rxlev), rxlev2dbm(rxlev_avg),
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rxlev2dbm(params->rxlev_meas.lower_thresh), rxlev2dbm(params->rxlev_meas.upper_thresh),
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rxqual, rxqual_avg, params->rxqual_meas.lower_thresh, params->rxqual_meas.upper_thresh);
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|
state->current = new_att;
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|
return 1;
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|
}
|
|
|
|
/* Default MS/BS Power Control parameters (see 3GPP TS 45.008, table A.1) */
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const struct gsm_power_ctrl_params power_ctrl_params_def = {
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/* Power increasing/reducing step size (optimal defaults) */
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.inc_step_size_db = 4, /* quickly increase MS/BS power */
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.red_step_size_db = 2, /* slowly decrease MS/BS power */
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|
|
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/* RxLev measurement parameters */
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.rxlev_meas = {
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/* Thresholds for RxLev (see 3GPP TS 45.008, A.3.2.1) */
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.lower_thresh = 32, /* L_RXLEV_XX_P (-78 dBm) */
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.upper_thresh = 38, /* U_RXLEV_XX_P (-72 dBm) */
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|
|
|
/* NOTE: only Osmocom specific EWMA is supported */
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.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_OSMO_EWMA,
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.ewma.alpha = 50, /* Smoothing factor 50% */
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|
},
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|
|
|
/* RxQual measurement parameters */
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|
.rxqual_meas = {
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/* Thresholds for RxQual (see 3GPP TS 45.008, A.3.2.1) */
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.lower_thresh = 3, /* L_RXQUAL_XX_P (0.8% <= BER < 1.6%) */
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.upper_thresh = 0, /* U_RXQUAL_XX_P (BER < 0.2%) */
|
|
|
|
/* No averaging (filtering) by default.
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|
* NOTE: only Osmocom specific EWMA is supported */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
},
|
|
|
|
/* C/I measurement parameters.
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|
* Target C/I retrieved from "GSM/EDGE: Evolution and Performance" Table 10.3.
|
|
* Set lower and upper so that (lower + upper) / 2 is equal or slightly
|
|
* above the target.
|
|
*/
|
|
.ci_fr_meas = { /* FR: Target C/I = 15 dB, Soft blocking threshold = 10 dB */
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|
.lower_thresh = 13,
|
|
.upper_thresh = 17,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_FR_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_FR_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
.ci_hr_meas = { /* HR: Target C/I = 18 dB, Soft blocking threshold = 13 dB */
|
|
.lower_thresh = 16,
|
|
.upper_thresh = 21,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_HR_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_HR_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
.ci_amr_fr_meas = { /* AMR-FR: Target C/I = 9 dB, Soft blocking threshold = 4 dB */
|
|
.lower_thresh = 7,
|
|
.upper_thresh = 11,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_AMR_FR_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_AMR_FR_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
.ci_amr_hr_meas = { /* AMR-HR: Target C/I = 15 dB, Soft blocking threshold = 10 dB */
|
|
.lower_thresh = 13,
|
|
.upper_thresh = 17,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_AMR_HR_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_AMR_HR_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
.ci_sdcch_meas = { /* SDCCH: Target C/I = 14 dB, Soft blocking threshold = 9 dB */
|
|
.lower_thresh = 12,
|
|
.upper_thresh = 16,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_SDCCH_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_SDCCH_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
.ci_gprs_meas = { /* GPRS: Target C/I = 20 dB, Soft blocking threshold = 15 dB */
|
|
.lower_thresh = 18,
|
|
.upper_thresh = 24,
|
|
|
|
/* Increase {UL,DL}_TXPWR if at least LOWER_CMP_P averages
|
|
* out of LOWER_CMP_N averages are lower than L_CI_GPRS_XX_P */
|
|
.lower_cmp_p = 5, /* P3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
.lower_cmp_n = 7, /* N3 as in 3GPP TS 45.008, A.3.2.1 (case c) */
|
|
/* Decrease {UL,DL}_TXPWR if at least UPPER_CMP_P averages
|
|
* out of UPPER_CMP_N averages are greater than L_CI_GPRS_XX_P */
|
|
.upper_cmp_p = 15, /* P4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
.upper_cmp_n = 18, /* N4 as in 3GPP TS 45.008, A.3.2.1 (case d) */
|
|
|
|
/* No averaging (filtering) by default */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
|
|
/* Hreqave: the period over which an average is produced */
|
|
.h_reqave = 4, /* TODO: investigate a reasonable default value */
|
|
/* Hreqt: the number of averaged results maintained */
|
|
.h_reqt = 6, /* TODO: investigate a reasonable default value */
|
|
},
|
|
};
|
|
|
|
void power_ctrl_params_def_reset(struct gsm_power_ctrl_params *params, bool is_bs_pwr)
|
|
{
|
|
*params = power_ctrl_params_def;
|
|
|
|
/* Trigger loop every N-th SACCH block. See 3GPP TS 45.008 section 4.7.1. */
|
|
if (!is_bs_pwr)
|
|
params->ctrl_interval = 2; /* N=4 (1.92s) */
|
|
else
|
|
params->ctrl_interval = 1; /* N=2 (0.960) */
|
|
}
|