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/* Loop control for OsmoBTS-TRX */
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/* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
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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 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 <stdlib.h>
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#include <errno.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/l1sap.h>
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#include <osmocom/core/bits.h>
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#include "trx_if.h"
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#include "l1_if.h"
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#include "loops.h"
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35
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36
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/*
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* MS Power loop
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38
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*/
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39
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40
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41
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42
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/*! Input a new RSSI value into the MS power control loop for the given logical channel.
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* \param lchan logical channel
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44
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* \param chan_state L1 channel state of the logical channel.
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* \param rssi Received Signal Strength Indication (in dBm) */
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46
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static void ms_power_val(struct gsm_lchan *lchan, struct l1sched_chan_state *chan_state, int8_t rssi)
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47
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{
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48
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int8_t ms_send;
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49
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switch(rssi)
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50
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{
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51
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case -2:
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52
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ms_send = 13;
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53
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break;
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54
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case -3:
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55
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ms_send = 13;
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56
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break;
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57
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case -4:
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58
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ms_send = 13;
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59
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break;
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case -5:
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ms_send = 13;
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break;
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case -6:
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ms_send = 14;
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break;
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case -7:
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ms_send = 14;
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break;
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case -8:
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ms_send = 14;
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break;
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case -9:
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ms_send = 15;
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break;
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case -10:
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ms_send = 15;
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break;
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case -11:
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ms_send = 15;
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break;
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case -12:
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ms_send = 15;
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break;
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case -13:
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ms_send = 16;
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break;
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case -14:
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ms_send = 16;
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break;
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case -15:
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ms_send = 16;
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break;
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case -16:
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ms_send = 17;
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break;
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case -17:
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ms_send = 17;
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break;
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case -18:
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ms_send = 18;
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break;
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case -19:
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ms_send = 18;
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break;
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case -20:
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ms_send = 19;
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break;
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case -21:
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ms_send = 19;
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break;
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case -22:
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ms_send = 20;
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break;
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case -23:
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ms_send = 20;
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break;
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case -24:
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ms_send = 21;
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break;
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case -25:
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ms_send = 21;
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break;
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case -26:
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ms_send = 22;
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break;
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case -27:
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ms_send = 22;
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break;
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case -28:
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ms_send = 23;
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break;
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case -29:
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ms_send = 23;
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break;
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case -30:
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ms_send = 23;
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break;
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case -31:
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ms_send = 24;
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break;
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case -32:
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ms_send = 24;
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break;
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case -33:
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ms_send = 24;
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break;
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case -34:
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ms_send = 25;
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break;
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case -35:
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ms_send = 25;
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break;
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case -36:
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ms_send = 25;
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break;
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case -37:
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ms_send = 26;
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break;
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case -38:
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ms_send = 26;
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break;
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case -39:
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ms_send = 26;
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break;
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case -40:
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ms_send = 27;
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break;
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case -41:
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ms_send = 27;
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break;
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case -42:
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ms_send = 27;
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break;
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case -43:
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ms_send = 28;
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break;
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case -44:
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ms_send = 28;
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break;
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case -45:
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ms_send = 28;
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break;
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case -46:
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ms_send = 29;
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break;
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case -47:
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ms_send = 29;
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break;
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case -48:
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ms_send = 29;
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break;
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case -49:
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ms_send = 30;
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break;
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case -50:
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ms_send = 30;
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break;
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case -51:
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ms_send = 30;
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break;
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case -52:
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ms_send = 31;
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break;
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case -53:
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ms_send = 31;
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break;
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case -54:
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ms_send = 31;
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break;
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case -55:
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ms_send = 32;
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break;
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case -56:
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ms_send = 32;
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break;
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case -57:
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ms_send = 32;
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break;
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default:
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ms_send = 33;
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break;
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}
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if (rssi > -2)
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ms_send = 13;
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lchan->ms_power_ctrl.current = ms_send;
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LOGPLCHAN(lchan, DLOOP, LOGL_INFO, "RSSI value: %d\n", rssi);
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Set ms_power_ctrl.current value: %d\n", ms_send);
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}
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/*! Process a single clock tick of the MS power control loop.
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* \param lchan Logical channel to which the clock tick applies */
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//static void ms_power_clock(struct gsm_lchan *lchan, struct l1sched_chan_state *chan_state)
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//{
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// struct gsm_bts_trx *trx = lchan->ts->trx;
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// struct phy_instance *pinst = trx_phy_instance(trx);
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// int rssi;
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// int i;
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240
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241
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/* skip every second clock, to prevent oscillating due to roundtrip
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* delay */
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243
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// if (!(chan_state->meas.clock & 1))
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// return;
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245
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// LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Got SACCH master clock at RSSI count %d\n",
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// chan_state->meas.rssi_count);
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248
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/* wait for initial burst */
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/* Отключить
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if (!chan_state->meas.rssi_got_burst)
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ms_power_diff(lchan, MS_RAISE_MAX);
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return; */
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254
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/* if no burst was received from MS at clock */
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256
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/* Отключить
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257
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if (chan_state->meas.rssi_count == 0) {
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258
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LOGPLCHAN(lchan, DLOOP, LOGL_NOTICE, "LOST SACCH frame, so we raise MS power\n");
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259
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ms_power_diff(lchan, MS_RAISE_MAX);
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260
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return;
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261
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}*/
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262
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263
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/* reset total counter */
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264
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// chan_state->meas.rssi_count = 0;
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265
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266
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/* check the minimum level received after MS acknowledged the ordered
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267
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* power level */
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268
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// if (chan_state->meas.rssi_valid_count == 0)
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269
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// return;
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270
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// for (rssi = 999, i = 0; i < chan_state->meas.rssi_valid_count; i++) {
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271
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// if (rssi > chan_state->meas.rssi[i])
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272
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// rssi = chan_state->meas.rssi[i];
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273
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// }
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274
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275
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/* reset valid counter */
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276
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// chan_state->meas.rssi_valid_count = 0;
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277
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278
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/* change RSSI
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279
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Lowest RSSI: %d Target RSSI: %d Current "
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280
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"MS power: %d (%d dBm)\n", rssi,
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281
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pinst->phy_link->u.osmotrx.trx_target_rssi, lchan->ms_power_ctrl.current,
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282
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ms_pwr_dbm(trx->bts->band, lchan->ms_power_ctrl.current));
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283
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ms_power_diff(lchan, pinst->phy_link->u.osmotrx.trx_target_rssi - rssi); */
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284
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//}
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285
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286
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287
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/* 90% of one bit duration in 1/256 symbols: 256*0.9 */
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288
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#define TOA256_9OPERCENT 230
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289
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290
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/*
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291
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* Timing Advance loop
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292
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*/
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293
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294
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void ta_val(struct gsm_lchan *lchan, struct l1sched_chan_state *chan_state, int16_t toa256)
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295
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{
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296
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/* check if the current L1 header acks to the current ordered TA */
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297
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if (lchan->meas.l1_info[1] != lchan->rqd_ta)
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298
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return;
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299
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300
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/* sum measurement */
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301
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chan_state->meas.toa256_sum += toa256;
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302
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if (++(chan_state->meas.toa_num) < 16)
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303
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return;
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304
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305
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/* complete set */
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306
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toa256 = chan_state->meas.toa256_sum / chan_state->meas.toa_num;
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307
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308
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/* check for change of TOA */
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309
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if (toa256 < -TOA256_9OPERCENT && lchan->rqd_ta > 0) {
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310
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "TOA is too early (%d), now lowering TA from %d to %d\n",
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311
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toa256, lchan->rqd_ta, lchan->rqd_ta - 1);
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312
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lchan->rqd_ta--;
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313
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} else if (toa256 > TOA256_9OPERCENT && lchan->rqd_ta < 63) {
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314
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "TOA is too late (%d), now raising TA from %d to %d\n",
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315
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toa256, lchan->rqd_ta, lchan->rqd_ta + 1);
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316
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lchan->rqd_ta++;
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317
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} else
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318
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LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "TOA is correct (%d), keeping current TA of %d\n",
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319
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toa256, lchan->rqd_ta);
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320
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|
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321
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chan_state->meas.toa_num = 0;
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322
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chan_state->meas.toa256_sum = 0;
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323
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}
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324
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|
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325
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/*! Process a SACCH event as input to the MS power control and TA loop. Function
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326
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* is called once every uplink SACCH block is received.
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327
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* \param l1t L1 TRX instance on which we operate
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328
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* \param chan_nr RSL channel number on which we operate
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329
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* \param chan_state L1 scheduler channel state of the channel on which we operate
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330
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* \param[in] rssi Receive Signal Strength Indication
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331
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* \param[in] toa256 Time of Arrival in 1/256 symbol periods */
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332
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void trx_loop_sacch_input(struct l1sched_trx *l1t, uint8_t chan_nr,
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333
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struct l1sched_chan_state *chan_state, int8_t rssi, int16_t toa256)
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334
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{
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335
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struct gsm_lchan *lchan = &l1t->trx->ts[L1SAP_CHAN2TS(chan_nr)]
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336
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.lchan[l1sap_chan2ss(chan_nr)];
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337
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struct phy_instance *pinst = trx_phy_instance(l1t->trx);
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338
|
|
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339
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/* if MS power control loop is enabled, handle it */
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340
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if (pinst->phy_link->u.osmotrx.trx_ms_power_loop)
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341
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ms_power_val(lchan, chan_state, rssi);
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342
|
|
|
343
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/* if TA loop is enabled, handle it */
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344
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if (pinst->phy_link->u.osmotrx.trx_ta_loop)
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345
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ta_val(lchan, chan_state, toa256);
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|
346
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}
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|
347
|
|
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348
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/*! Called once every downlink SACCH block needs to be sent. */
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|
349
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void trx_loop_sacch_clock(struct l1sched_trx *l1t, uint8_t chan_nr,
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|
350
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struct l1sched_chan_state *chan_state)
|
|
351
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{
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352
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struct gsm_lchan *lchan = &l1t->trx->ts[L1SAP_CHAN2TS(chan_nr)]
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353
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.lchan[l1sap_chan2ss(chan_nr)];
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354
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struct phy_instance *pinst = trx_phy_instance(l1t->trx);
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355
|
|
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356
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if (lchan->ms_power_ctrl.fixed)
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357
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return;
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|
358
|
|
|
359
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// if (pinst->phy_link->u.osmotrx.trx_ms_power_loop)
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|
360
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// ms_power_clock(lchan, chan_state);
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|
361
|
|
|
362
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/* count the number of SACCH clocks */
|
|
363
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chan_state->meas.clock++;
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|
364
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}
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|
365
|
|
|
366
|
void trx_loop_amr_input(struct l1sched_trx *l1t, uint8_t chan_nr,
|
|
367
|
struct l1sched_chan_state *chan_state, float ber)
|
|
368
|
{
|
|
369
|
struct gsm_bts_trx *trx = l1t->trx;
|
|
370
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struct gsm_lchan *lchan = &trx->ts[L1SAP_CHAN2TS(chan_nr)]
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|
371
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.lchan[l1sap_chan2ss(chan_nr)];
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|
372
|
|
|
373
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/* check if loop is enabled */
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|
374
|
if (!chan_state->amr_loop)
|
|
375
|
return;
|
|
376
|
|
|
377
|
/* wait for MS to use the requested codec */
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|
378
|
if (chan_state->ul_ft != chan_state->dl_cmr)
|
|
379
|
return;
|
|
380
|
|
|
381
|
/* count bit errors */
|
|
382
|
if (L1SAP_IS_CHAN_TCHH(chan_nr)) {
|
|
383
|
chan_state->ber_num += 2;
|
|
384
|
chan_state->ber_sum += (ber + ber);
|
|
385
|
} else {
|
|
386
|
chan_state->ber_num++;
|
|
387
|
chan_state->ber_sum += ber;
|
|
388
|
}
|
|
389
|
|
|
390
|
/* count frames */
|
|
391
|
if (chan_state->ber_num < 48)
|
|
392
|
return;
|
|
393
|
|
|
394
|
/* calculate average (reuse ber variable) */
|
|
395
|
ber = chan_state->ber_sum / chan_state->ber_num;
|
|
396
|
|
|
397
|
/* reset bit errors */
|
|
398
|
chan_state->ber_num = 0;
|
|
399
|
chan_state->ber_sum = 0;
|
|
400
|
|
|
401
|
LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Current bit error rate (BER) %.6f "
|
|
402
|
"codec id %d\n", ber, chan_state->ul_ft);
|
|
403
|
|
|
404
|
/* degrade */
|
|
405
|
if (chan_state->dl_cmr > 0) {
|
|
406
|
/* degrade, if ber is above threshold FIXME: C/I */
|
|
407
|
if (ber >
|
|
408
|
lchan->tch.amr_mr.bts_mode[chan_state->dl_cmr-1].threshold) {
|
|
409
|
LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Degrading due to BER %.6f "
|
|
410
|
"from codec id %d to %d\n", ber, chan_state->dl_cmr,
|
|
411
|
chan_state->dl_cmr - 1);
|
|
412
|
chan_state->dl_cmr--;
|
|
413
|
}
|
|
414
|
} else if (chan_state->dl_cmr < chan_state->codecs - 1) {
|
|
415
|
/* degrade, if ber is above threshold FIXME: C/I*/
|
|
416
|
if (ber <
|
|
417
|
lchan->tch.amr_mr.bts_mode[chan_state->dl_cmr].threshold
|
|
418
|
- lchan->tch.amr_mr.bts_mode[chan_state->dl_cmr].hysteresis) {
|
|
419
|
LOGPLCHAN(lchan, DLOOP, LOGL_DEBUG, "Upgrading due to BER %.6f "
|
|
420
|
"from codec id %d to %d\n", ber, chan_state->dl_cmr,
|
|
421
|
chan_state->dl_cmr + 1);
|
|
422
|
chan_state->dl_cmr++;
|
|
423
|
}
|
|
424
|
}
|
|
425
|
}
|
|
426
|
|
|
427
|
void trx_loop_amr_set(struct l1sched_chan_state *chan_state, int loop)
|
|
428
|
{
|
|
429
|
if (chan_state->amr_loop && !loop) {
|
|
430
|
chan_state->amr_loop = 0;
|
|
431
|
return;
|
|
432
|
}
|
|
433
|
|
|
434
|
if (!chan_state->amr_loop && loop) {
|
|
435
|
chan_state->amr_loop = 1;
|
|
436
|
|
|
437
|
/* reset bit errors */
|
|
438
|
chan_state->ber_num = 0;
|
|
439
|
chan_state->ber_sum = 0;
|
|
440
|
|
|
441
|
return;
|
|
442
|
}
|
|
443
|
}
|
