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/* (C) 2018 Stefan Sperling <ssperling@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef _ACC_RAMP_H_
#define _ACC_RAMP_H_
#include <stdbool.h>
#include <stdint.h>
#include <osmocom/core/timer.h>
/*
* Access control class (ACC) ramping is used to slowly make the cell available to
* an increasing number of MS. This avoids overload at startup time in cases where
* a lot of MS would discover the new cell and try to connect to it all at once.
*/
enum acc_ramp_step_size {
ACC_RAMP_STEP_SIZE_MIN = 1, /* allow at most 1 new ACC per ramp step */
ACC_RAMP_STEP_SIZE_DEFAULT = ACC_RAMP_STEP_SIZE_MIN,
ACC_RAMP_STEP_SIZE_MAX = 10, /* allow all ACC in one step (disables ramping) */
};
enum acc_ramp_step_interval {
ACC_RAMP_STEP_INTERVAL_MIN = 1, /* 1 second */
ACC_RAMP_STEP_INTERVAL_DEFAULT = 60, /* 1 minute */
ACC_RAMP_STEP_INTERVAL_MAX = 600, /* 10 minutes */
};
struct acc_ramp {
/*
* Bitmasks which keep track of access control classes that are currently
* denied access to this BTS. These masks modulate bits from octets 2 and 3
* of the RACH Control Parameters (see 3GPP 44.018 10.5.2.29).
* While a bit in these masks is set, the corresponding ACC is barred.
* Note that t2 contains bits for classes 11-15 which should always be allowed,
* and a bit which denies emergency calls for all ACCs from 0-9 inclusive.
* Ramping is only concerned with those bits which control access for ACCs 0-9.
*/
uint8_t barred_t2;
uint8_t barred_t3;
/*
* This controls the maximum number of ACCs to allow per ramping step (1 - 10).
* The compile-time default value is ACC_RAMP_STEP_SIZE_DEFAULT.
* This value can be changed by VTY configuration.
* A value of ACC_RAMP_STEP_SIZE_MAX effectively disables ramping.
*/
enum acc_ramp_step_size step_size;
/*
* Ramping step interval in seconds.
* This value depends on the current BTS channel load average, unless
* it has been overriden by VTY configuration.
*/
unsigned int step_interval_sec;
bool step_interval_is_fixed;
struct osmo_timer_list step_timer;
};
void acc_ramp_init(struct acc_ramp *acc_ramp);
void acc_ramp_start(struct acc_ramp *acc_ramp);
void acc_ramp_stop(struct acc_ramp *acc_ramp);
#endif /* _ACC_RAMP_H_ */
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