107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/* Support for generating RSL Load Indication */
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/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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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 <osmocom/core/timer.h>
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#include <osmocom/core/msgb.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/rsl.h>
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#include <osmo-bts/paging.h>
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#include <osmo-bts/bts.h>
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static void reset_load_counters(struct gsm_bts *bts)
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{
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/* re-set the counters */
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bts->load.ccch.pch_used = bts->load.ccch.pch_total = 0;
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bts->load.rach.busy = bts->load.rach.access = bts->load.rach.total = 0;
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}
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static void load_timer_cb(void *data)
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{
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struct gsm_bts *bts = data;
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unsigned int pch_percent, rach_percent;
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/* It makes no sense to send Load Indication if CCCH is still disabled...*/
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if (bts->c0->ts[0].mo.nm_state.operational != NM_OPSTATE_ENABLED)
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goto retry_later;
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/* compute percentages */
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if (bts->load.ccch.pch_total == 0)
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pch_percent = 0;
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else
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pch_percent = (bts->load.ccch.pch_used * 100) /
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bts->load.ccch.pch_total;
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if (pch_percent >= bts->load.ccch.load_ind_thresh) {
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/* send RSL load indication message to BSC */
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uint16_t buffer_space = paging_buffer_space(bts->paging_state);
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rsl_tx_ccch_load_ind_pch(bts, buffer_space);
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} else {
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/* This is an extension of TS 08.58. We don't only
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* send load indications if the load is above threshold,
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* but we also explicitly indicate that we are below
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* threshold by using the magic value 0xffff */
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rsl_tx_ccch_load_ind_pch(bts, 0xffff);
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}
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if (bts->load.rach.total == 0)
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rach_percent = 0;
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else
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rach_percent = (bts->load.rach.busy * 100) /
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bts->load.rach.total;
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if (rach_percent >= bts->load.ccch.load_ind_thresh) {
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/* send RSL load indication message to BSC */
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rsl_tx_ccch_load_ind_rach(bts, bts->load.rach.total,
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bts->load.rach.busy,
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bts->load.rach.access);
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}
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retry_later:
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reset_load_counters(bts);
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/* re-schedule the timer */
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osmo_timer_schedule(&bts->load.ccch.timer,
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bts->load.ccch.load_ind_period, 0);
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}
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void load_timer_start(struct gsm_bts *bts)
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{
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if (!bts->load.ccch.timer.data) {
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bts->load.ccch.timer.data = bts;
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bts->load.ccch.timer.cb = load_timer_cb;
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reset_load_counters(bts);
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}
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osmo_timer_schedule(&bts->load.ccch.timer, bts->load.ccch.load_ind_period, 0);
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}
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void load_timer_stop(struct gsm_bts *bts)
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{
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osmo_timer_del(&bts->load.ccch.timer);
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}
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bool load_timer_is_running(const struct gsm_bts *bts)
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{
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return osmo_timer_pending(&bts->load.ccch.timer);
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}
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