2011-06-27 09:25:35 +00:00
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/* BTS support code common to all supported BTS models */
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2011-03-04 13:05:20 +00:00
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/* (C) 2011 by Andreas Eversberg <jolly@eversberg.eu>
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2011-06-27 09:25:35 +00:00
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* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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2011-03-04 13:05:20 +00:00
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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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2011-06-27 09:25:35 +00:00
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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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2011-03-04 13:05:20 +00:00
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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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2011-06-27 09:25:35 +00:00
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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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2011-03-04 13:05:20 +00:00
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*
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*/
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2011-03-04 13:18:23 +00:00
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#include <errno.h>
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2011-07-01 17:03:30 +00:00
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#include <unistd.h>
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#include <stdio.h>
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2011-03-04 13:18:23 +00:00
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2011-03-04 13:05:20 +00:00
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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2011-05-22 18:26:58 +00:00
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#include <osmocom/core/select.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/gsm/protocol/gsm_12_21.h>
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2011-06-27 09:25:35 +00:00
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#include <osmocom/gsm/lapdm.h>
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2011-09-03 13:41:12 +00:00
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#include <osmocom/trau/osmo_ortp.h>
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2011-06-27 09:25:35 +00:00
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2011-03-04 13:18:23 +00:00
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#include <osmo-bts/logging.h>
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#include <osmo-bts/abis.h>
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#include <osmo-bts/bts.h>
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2011-07-01 16:22:01 +00:00
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#include <osmo-bts/bts_model.h>
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2011-03-04 13:18:23 +00:00
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#include <osmo-bts/rsl.h>
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#include <osmo-bts/oml.h>
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2014-02-14 15:42:49 +00:00
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#include <osmo-bts/signal.h>
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2011-03-04 13:05:20 +00:00
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2011-09-04 20:42:03 +00:00
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struct gsm_network bts_gsmnet = {
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.bts_list = { &bts_gsmnet.bts_list, &bts_gsmnet.bts_list },
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.num_bts = 0,
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};
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2011-06-27 09:25:35 +00:00
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void *tall_bts_ctx;
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2014-02-14 15:42:49 +00:00
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/* Table 3.1 TS 04.08: Values of parameter S */
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static const uint8_t tx_integer[] = {
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3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 20, 25, 32, 50,
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};
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static const uint8_t s_values[][2] = {
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{ 55, 41 }, { 76, 52 }, { 109, 58 }, { 163, 86 }, { 217, 115 },
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};
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static int bts_signal_cbfn(unsigned int subsys, unsigned int signal,
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void *hdlr_data, void *signal_data)
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{
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if (subsys == SS_GLOBAL && signal == S_NEW_SYSINFO) {
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struct gsm_bts *bts = signal_data;
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bts_update_agch_max_queue_length(bts);
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}
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return 0;
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}
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2011-06-27 09:25:35 +00:00
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int bts_init(struct gsm_bts *bts)
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{
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struct gsm_bts_role_bts *btsb;
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2011-09-03 13:41:12 +00:00
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struct gsm_bts_trx *trx;
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2011-09-04 20:42:03 +00:00
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int rc;
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2014-02-14 15:42:49 +00:00
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static int initialized = 0;
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2011-09-04 20:42:03 +00:00
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2012-07-08 18:20:51 +00:00
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/* add to list of BTSs */
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llist_add_tail(&bts->list, &bts_gsmnet.bts_list);
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2011-09-04 20:42:03 +00:00
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bts->band = GSM_BAND_1800;
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2011-06-27 09:25:35 +00:00
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bts->role = btsb = talloc_zero(bts, struct gsm_bts_role_bts);
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INIT_LLIST_HEAD(&btsb->agch_queue);
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2014-02-21 14:09:14 +00:00
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btsb->agch_queue_length = 0;
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2011-03-04 13:05:20 +00:00
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2014-02-14 20:15:31 +00:00
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/* enable management with default levels,
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* raise threshold to GSM_BTS_AGCH_QUEUE_THRESH_LEVEL_DISABLE to
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* disable this feature.
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*/
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btsb->agch_queue_low_level = GSM_BTS_AGCH_QUEUE_LOW_LEVEL_DEFAULT;
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btsb->agch_queue_high_level = GSM_BTS_AGCH_QUEUE_HIGH_LEVEL_DEFAULT;
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btsb->agch_queue_thresh_level = GSM_BTS_AGCH_QUEUE_THRESH_LEVEL_DEFAULT;
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2012-11-13 04:20:47 +00:00
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/* configurable via VTY */
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2011-06-27 09:25:35 +00:00
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btsb->paging_state = paging_init(btsb, 200, 0);
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2012-11-13 04:20:47 +00:00
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/* configurable via OML */
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2012-12-18 22:56:05 +00:00
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btsb->load.ccch.load_ind_period = 112;
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2012-06-04 15:27:13 +00:00
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load_timer_start(bts);
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2011-09-08 13:18:43 +00:00
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btsb->rtp_jitter_buf_ms = 100;
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2012-06-15 15:22:26 +00:00
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btsb->max_ta = 63;
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2014-01-23 15:00:11 +00:00
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btsb->ny1 = 4;
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btsb->t3105_ms = 300;
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2011-09-08 13:18:43 +00:00
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2013-02-05 08:06:49 +00:00
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/* default RADIO_LINK_TIMEOUT */
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btsb->radio_link_timeout = 32;
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2011-07-01 16:09:34 +00:00
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/* set BTS to dependency */
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2013-06-30 13:05:09 +00:00
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oml_mo_state_init(&bts->mo, -1, NM_AVSTATE_DEPENDENCY);
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oml_mo_state_init(&bts->gprs.nse.mo, -1, NM_AVSTATE_DEPENDENCY);
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oml_mo_state_init(&bts->gprs.cell.mo, -1, NM_AVSTATE_DEPENDENCY);
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oml_mo_state_init(&bts->gprs.nsvc[0].mo, -1, NM_AVSTATE_DEPENDENCY);
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oml_mo_state_init(&bts->gprs.nsvc[1].mo, -1, NM_AVSTATE_DEPENDENCY);
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2011-07-01 16:09:34 +00:00
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2011-09-03 13:41:12 +00:00
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/* initialize bts data structure */
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llist_for_each_entry(trx, &bts->trx_list, list) {
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New generic transmit power handling
In order to support transmit power reduction by thermal management
as well as the variety of new internal / external PA configurations
of BTSs, we need a slightly more complex system.
Also, as at high power a single dB can be quite a big difference,
we are now doing all computations in milli-dB(m), i.e. 1/10000 bel.
Ramping is now used both for up and down ramping, as that is useful in
cases where you want to gracefully shut down a cell by shrinking its
radius, gradually handing over subscribers to neighboring cells.
Furthermore, this code is becoming part of the 'common' codebase, as it
is not really specific to how sysmobts is working.
The user can specify a single aggregate value for external system
gain/attenuation. Let's say you have 1dB loss of antenna cable, so you
can put that as 'user-gain -1' into the config, which means that a
'transmit power of 20dBm' will be compensatet for that and the TRX is
instructed to output 21dBm to compensate the cable loss. Similarly,
external PAs can be described by a positive user-gain.
One of the next steps will be to communicate those values and the
nominal power capability of the specific BTS to the BSC, so the BSC will
automatically show correct signal levels in the VTY and log files.
The code includes provisions for future extensions regarding
* an external and an internal PA with calibration tables
* a thermal attenuation setting to be controlled by the site manager
2014-08-22 00:46:15 +00:00
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struct trx_power_params *tpp = &trx->power_params;
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2011-09-03 13:41:12 +00:00
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int i;
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New generic transmit power handling
In order to support transmit power reduction by thermal management
as well as the variety of new internal / external PA configurations
of BTSs, we need a slightly more complex system.
Also, as at high power a single dB can be quite a big difference,
we are now doing all computations in milli-dB(m), i.e. 1/10000 bel.
Ramping is now used both for up and down ramping, as that is useful in
cases where you want to gracefully shut down a cell by shrinking its
radius, gradually handing over subscribers to neighboring cells.
Furthermore, this code is becoming part of the 'common' codebase, as it
is not really specific to how sysmobts is working.
The user can specify a single aggregate value for external system
gain/attenuation. Let's say you have 1dB loss of antenna cable, so you
can put that as 'user-gain -1' into the config, which means that a
'transmit power of 20dBm' will be compensatet for that and the TRX is
instructed to output 21dBm to compensate the cable loss. Similarly,
external PAs can be described by a positive user-gain.
One of the next steps will be to communicate those values and the
nominal power capability of the specific BTS to the BSC, so the BSC will
automatically show correct signal levels in the VTY and log files.
The code includes provisions for future extensions regarding
* an external and an internal PA with calibration tables
* a thermal attenuation setting to be controlled by the site manager
2014-08-22 00:46:15 +00:00
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2011-09-03 13:41:12 +00:00
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for (i = 0; i < ARRAY_SIZE(trx->ts); i++) {
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struct gsm_bts_trx_ts *ts = &trx->ts[i];
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int k;
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for (k = 0; k < ARRAY_SIZE(ts->lchan); k++) {
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struct gsm_lchan *lchan = &ts->lchan[k];
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INIT_LLIST_HEAD(&lchan->dl_tch_queue);
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}
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}
|
New generic transmit power handling
In order to support transmit power reduction by thermal management
as well as the variety of new internal / external PA configurations
of BTSs, we need a slightly more complex system.
Also, as at high power a single dB can be quite a big difference,
we are now doing all computations in milli-dB(m), i.e. 1/10000 bel.
Ramping is now used both for up and down ramping, as that is useful in
cases where you want to gracefully shut down a cell by shrinking its
radius, gradually handing over subscribers to neighboring cells.
Furthermore, this code is becoming part of the 'common' codebase, as it
is not really specific to how sysmobts is working.
The user can specify a single aggregate value for external system
gain/attenuation. Let's say you have 1dB loss of antenna cable, so you
can put that as 'user-gain -1' into the config, which means that a
'transmit power of 20dBm' will be compensatet for that and the TRX is
instructed to output 21dBm to compensate the cable loss. Similarly,
external PAs can be described by a positive user-gain.
One of the next steps will be to communicate those values and the
nominal power capability of the specific BTS to the BSC, so the BSC will
automatically show correct signal levels in the VTY and log files.
The code includes provisions for future extensions regarding
* an external and an internal PA with calibration tables
* a thermal attenuation setting to be controlled by the site manager
2014-08-22 00:46:15 +00:00
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/* Default values for the power adjustments */
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tpp->ramp.max_initial_pout_mdBm = to_mdB(23);
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tpp->ramp.step_size_mdB = to_mdB(2);
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tpp->ramp.step_interval_sec = 1;
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2011-09-03 13:41:12 +00:00
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}
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osmo_rtp_init(tall_bts_ctx);
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2011-09-04 20:42:03 +00:00
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rc = bts_model_init(bts);
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2012-07-08 18:20:51 +00:00
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if (rc < 0) {
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llist_del(&bts->list);
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2011-09-04 20:42:03 +00:00
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return rc;
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2012-07-08 18:20:51 +00:00
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}
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2011-09-04 20:42:03 +00:00
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bts_gsmnet.num_bts++;
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2014-02-14 15:42:49 +00:00
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if (!initialized) {
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osmo_signal_register_handler(SS_GLOBAL, bts_signal_cbfn, NULL);
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initialized = 1;
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}
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2011-09-04 20:42:03 +00:00
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return rc;
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2011-06-27 09:25:35 +00:00
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}
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2011-03-04 13:05:20 +00:00
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2011-06-29 18:42:14 +00:00
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static void shutdown_timer_cb(void *data)
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{
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2011-07-01 17:03:30 +00:00
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fprintf(stderr, "Shutdown timer expired\n");
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2011-06-29 18:42:14 +00:00
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exit(42);
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}
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static struct osmo_timer_list shutdown_timer = {
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.cb = &shutdown_timer_cb,
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};
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2011-07-01 16:09:34 +00:00
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void bts_shutdown(struct gsm_bts *bts, const char *reason)
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2011-06-29 18:42:14 +00:00
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{
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struct gsm_bts_trx *trx;
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2013-01-25 17:43:20 +00:00
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if (osmo_timer_pending(&shutdown_timer)) {
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LOGP(DOML, LOGL_NOTICE,
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"BTS is already being shutdown.\n");
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return;
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}
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2011-07-01 17:03:30 +00:00
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LOGP(DOML, LOGL_NOTICE, "Shutting down BTS %u, Reason %s\n",
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2011-07-01 16:09:34 +00:00
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bts->nr, reason);
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|
2013-01-25 10:07:12 +00:00
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llist_for_each_entry(trx, &bts->trx_list, list) {
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2011-06-29 18:42:14 +00:00
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bts_model_trx_deact_rf(trx);
|
2013-01-25 10:07:12 +00:00
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bts_model_trx_close(trx);
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}
|
2011-06-29 18:42:14 +00:00
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/* shedule a timer to make sure select loop logic can run again
|
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* to dispatch any pending primitives */
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osmo_timer_schedule(&shutdown_timer, 3, 0);
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}
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|
2011-03-04 13:05:20 +00:00
|
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/* main link is established, send status report */
|
2011-06-27 09:25:35 +00:00
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int bts_link_estab(struct gsm_bts *bts)
|
2011-03-04 13:05:20 +00:00
|
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{
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int i, j;
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LOGP(DSUM, LOGL_INFO, "Main link established, sending Status'.\n");
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|
2011-07-01 16:09:34 +00:00
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/* BTS and SITE MGR are EAABLED, BTS is DEPENDENCY */
|
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oml_tx_state_changed(&bts->site_mgr.mo);
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oml_tx_state_changed(&bts->mo);
|
2011-06-27 09:25:35 +00:00
|
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2012-06-28 06:59:48 +00:00
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/* those should all be in DEPENDENCY */
|
2012-07-24 07:33:35 +00:00
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oml_tx_state_changed(&bts->gprs.nse.mo);
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oml_tx_state_changed(&bts->gprs.cell.mo);
|
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oml_tx_state_changed(&bts->gprs.nsvc[0].mo);
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oml_tx_state_changed(&bts->gprs.nsvc[1].mo);
|
2012-06-28 06:59:48 +00:00
|
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|
2011-07-01 16:09:34 +00:00
|
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/* All other objects start off-line until the BTS Model code says otherwise */
|
2011-03-04 13:05:20 +00:00
|
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for (i = 0; i < bts->num_trx; i++) {
|
2011-06-27 09:25:35 +00:00
|
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struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, i);
|
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|
2011-07-01 16:09:34 +00:00
|
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oml_tx_state_changed(&trx->mo);
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oml_tx_state_changed(&trx->bb_transc.mo);
|
2011-06-27 09:25:35 +00:00
|
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for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
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struct gsm_bts_trx_ts *ts = &trx->ts[j];
|
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|
2011-07-01 16:09:34 +00:00
|
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oml_tx_state_changed(&ts->mo);
|
2011-03-04 13:05:20 +00:00
|
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|
}
|
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}
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|
2013-06-30 19:19:27 +00:00
|
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|
return bts_model_oml_estab(bts);
|
2011-03-04 13:05:20 +00:00
|
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|
}
|
|
|
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|
|
|
|
/* RSL link is established, send status report */
|
2011-06-27 09:25:35 +00:00
|
|
|
int trx_link_estab(struct gsm_bts_trx *trx)
|
2011-03-04 13:05:20 +00:00
|
|
|
{
|
2013-02-10 09:21:12 +00:00
|
|
|
struct e1inp_sign_link *link = trx->rsl_link;
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|
|
|
uint8_t radio_state = link ? NM_OPSTATE_ENABLED : NM_OPSTATE_DISABLED;
|
2011-03-04 13:05:20 +00:00
|
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|
2011-06-27 09:25:35 +00:00
|
|
|
LOGP(DSUM, LOGL_INFO, "RSL link (TRX %02x) state changed to %s, sending Status'.\n",
|
2013-02-10 09:21:12 +00:00
|
|
|
trx->nr, link ? "up" : "down");
|
2011-03-04 13:05:20 +00:00
|
|
|
|
2011-06-27 09:25:35 +00:00
|
|
|
oml_mo_state_chg(&trx->mo, radio_state, NM_AVSTATE_OK);
|
2011-03-04 13:05:20 +00:00
|
|
|
|
2013-02-10 09:21:12 +00:00
|
|
|
if (link)
|
2011-03-04 13:05:20 +00:00
|
|
|
rsl_tx_rf_res(trx);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-27 09:25:35 +00:00
|
|
|
int lchan_init_lapdm(struct gsm_lchan *lchan)
|
2011-03-04 13:05:20 +00:00
|
|
|
{
|
2011-06-27 09:25:35 +00:00
|
|
|
struct lapdm_channel *lc = &lchan->lapdm_ch;
|
|
|
|
|
|
|
|
lapdm_channel_init(lc, LAPDM_MODE_BTS);
|
|
|
|
lapdm_channel_set_flags(lc, LAPDM_ENT_F_POLLING_ONLY);
|
|
|
|
lapdm_channel_set_l1(lc, NULL, lchan);
|
|
|
|
lapdm_channel_set_l3(lc, lapdm_rll_tx_cb, lchan);
|
|
|
|
|
|
|
|
return 0;
|
2011-03-04 13:05:20 +00:00
|
|
|
}
|
2011-06-27 09:25:35 +00:00
|
|
|
|
2014-02-14 15:42:49 +00:00
|
|
|
#define CCCH_RACH_RATIO_COMBINED256 (256*1/9)
|
|
|
|
#define CCCH_RACH_RATIO_SEPARATE256 (256*10/55)
|
|
|
|
|
|
|
|
int bts_agch_max_queue_length(int T, int bcch_conf)
|
|
|
|
{
|
|
|
|
int S, ccch_rach_ratio256, i;
|
|
|
|
int T_group = 0;
|
|
|
|
int is_ccch_comb = 0;
|
|
|
|
|
|
|
|
if (bcch_conf == RSL_BCCH_CCCH_CONF_1_C)
|
|
|
|
is_ccch_comb = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The calculation is based on the ratio of the number RACH slots and
|
|
|
|
* CCCH blocks per time:
|
|
|
|
* Lmax = (T + 2*S) / R_RACH * R_CCCH
|
|
|
|
* where
|
|
|
|
* T3126_min = (T + 2*S) / R_RACH, as defined in GSM 04.08, 11.1.1
|
|
|
|
* R_RACH is the RACH slot rate (e.g. RACHs per multiframe)
|
|
|
|
* R_CCCH is the CCCH block rate (same time base like R_RACH)
|
|
|
|
* S and T are defined in GSM 04.08, 3.3.1.1.2
|
|
|
|
* The ratio is mainly influenced by the downlink only channels
|
|
|
|
* (BCCH, FCCH, SCH, CBCH) that can not be used for CCCH.
|
|
|
|
* An estimation with an error of < 10% is used:
|
|
|
|
* ~ 1/9 if CCCH is combined with SDCCH, and
|
|
|
|
* ~ 1/5.5 otherwise.
|
|
|
|
*/
|
|
|
|
ccch_rach_ratio256 = is_ccch_comb ?
|
|
|
|
CCCH_RACH_RATIO_COMBINED256 :
|
|
|
|
CCCH_RACH_RATIO_SEPARATE256;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(tx_integer); i++) {
|
|
|
|
if (tx_integer[i] == T) {
|
|
|
|
T_group = i % 5;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
S = s_values[T_group][is_ccch_comb];
|
|
|
|
|
|
|
|
return (T + 2 * S) * ccch_rach_ratio256 / 256;
|
|
|
|
}
|
|
|
|
|
|
|
|
void bts_update_agch_max_queue_length(struct gsm_bts *bts)
|
|
|
|
{
|
|
|
|
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
|
|
|
|
struct gsm48_system_information_type_3 *si3;
|
|
|
|
int old_max_length = btsb->agch_max_queue_length;
|
|
|
|
|
|
|
|
if (!(bts->si_valid & (1<<SYSINFO_TYPE_3)))
|
|
|
|
return;
|
|
|
|
|
|
|
|
si3 = GSM_BTS_SI(bts, SYSINFO_TYPE_3);
|
|
|
|
|
|
|
|
btsb->agch_max_queue_length =
|
|
|
|
bts_agch_max_queue_length(si3->rach_control.tx_integer,
|
|
|
|
si3->control_channel_desc.ccch_conf);
|
|
|
|
|
|
|
|
if (btsb->agch_max_queue_length != old_max_length)
|
|
|
|
LOGP(DRSL, LOGL_INFO, "Updated AGCH max queue length to %d\n",
|
|
|
|
btsb->agch_max_queue_length);
|
|
|
|
}
|
|
|
|
|
2014-02-20 17:45:45 +00:00
|
|
|
#define REQ_REFS_PER_IMM_ASS_REJ 4
|
|
|
|
static int store_imm_ass_rej_refs(struct gsm48_imm_ass_rej *rej,
|
|
|
|
struct gsm48_req_ref *req_refs,
|
|
|
|
uint8_t *wait_inds,
|
|
|
|
int count)
|
|
|
|
{
|
|
|
|
switch (count) {
|
|
|
|
case 0:
|
|
|
|
/* TODO: Warning ? */
|
|
|
|
return 0;
|
|
|
|
default:
|
|
|
|
count = 4;
|
|
|
|
rej->req_ref4 = req_refs[3];
|
|
|
|
rej->wait_ind4 = wait_inds[3];
|
|
|
|
/* fall through */
|
|
|
|
case 3:
|
|
|
|
rej->req_ref3 = req_refs[2];
|
|
|
|
rej->wait_ind3 = wait_inds[2];
|
|
|
|
/* fall through */
|
|
|
|
case 2:
|
|
|
|
rej->req_ref2 = req_refs[1];
|
|
|
|
rej->wait_ind2 = wait_inds[1];
|
|
|
|
/* fall through */
|
|
|
|
case 1:
|
|
|
|
rej->req_ref1 = req_refs[0];
|
|
|
|
rej->wait_ind1 = wait_inds[0];
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (count) {
|
|
|
|
case 1:
|
|
|
|
rej->req_ref2 = req_refs[0];
|
|
|
|
rej->wait_ind2 = wait_inds[0];
|
|
|
|
/* fall through */
|
|
|
|
case 2:
|
|
|
|
rej->req_ref3 = req_refs[0];
|
|
|
|
rej->wait_ind3 = wait_inds[0];
|
|
|
|
/* fall through */
|
|
|
|
case 3:
|
|
|
|
rej->req_ref4 = req_refs[0];
|
|
|
|
rej->wait_ind4 = wait_inds[0];
|
|
|
|
/* fall through */
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int extract_imm_ass_rej_refs(struct gsm48_imm_ass_rej *rej,
|
|
|
|
struct gsm48_req_ref *req_refs,
|
|
|
|
uint8_t *wait_inds)
|
|
|
|
{
|
|
|
|
int count = 0;
|
|
|
|
req_refs[count] = rej->req_ref1;
|
|
|
|
wait_inds[count] = rej->wait_ind1;
|
|
|
|
count++;
|
|
|
|
|
|
|
|
if (memcmp(&rej->req_ref1, &rej->req_ref2, sizeof(rej->req_ref2))) {
|
|
|
|
req_refs[count] = rej->req_ref2;
|
|
|
|
wait_inds[count] = rej->wait_ind2;
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (memcmp(&rej->req_ref1, &rej->req_ref3, sizeof(rej->req_ref3)) &&
|
|
|
|
memcmp(&rej->req_ref2, &rej->req_ref3, sizeof(rej->req_ref3))) {
|
|
|
|
req_refs[count] = rej->req_ref3;
|
|
|
|
wait_inds[count] = rej->wait_ind3;
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (memcmp(&rej->req_ref1, &rej->req_ref4, sizeof(rej->req_ref4)) &&
|
|
|
|
memcmp(&rej->req_ref2, &rej->req_ref4, sizeof(rej->req_ref4)) &&
|
|
|
|
memcmp(&rej->req_ref3, &rej->req_ref4, sizeof(rej->req_ref4))) {
|
|
|
|
req_refs[count] = rej->req_ref4;
|
|
|
|
wait_inds[count] = rej->wait_ind4;
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int try_merge_imm_ass_rej(struct gsm48_imm_ass_rej *old_rej,
|
|
|
|
struct gsm48_imm_ass_rej *new_rej)
|
|
|
|
{
|
|
|
|
struct gsm48_req_ref req_refs[2 * REQ_REFS_PER_IMM_ASS_REJ];
|
|
|
|
uint8_t wait_inds[2 * REQ_REFS_PER_IMM_ASS_REJ];
|
|
|
|
int count = 0;
|
|
|
|
int stored = 0;
|
|
|
|
|
|
|
|
if (new_rej->msg_type != GSM48_MT_RR_IMM_ASS_REJ)
|
|
|
|
return 0;
|
|
|
|
if (old_rej->msg_type != GSM48_MT_RR_IMM_ASS_REJ)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* GSM 08.58, 5.7
|
|
|
|
* -> The BTS may combine serveral IMM.ASS.REJ messages
|
|
|
|
* -> Identical request refs in one message may be squeezed
|
|
|
|
*
|
|
|
|
* GSM 04.08, 9.1.20.2
|
|
|
|
* -> Request ref and wait ind are duplicated to fill the message
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Extract all entries */
|
|
|
|
count = extract_imm_ass_rej_refs(old_rej,
|
|
|
|
&req_refs[count], &wait_inds[count]);
|
|
|
|
if (count == REQ_REFS_PER_IMM_ASS_REJ)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
count += extract_imm_ass_rej_refs(new_rej,
|
|
|
|
&req_refs[count], &wait_inds[count]);
|
|
|
|
|
|
|
|
/* Store entries into old message */
|
|
|
|
stored = store_imm_ass_rej_refs(old_rej,
|
|
|
|
&req_refs[stored], &wait_inds[stored],
|
|
|
|
count);
|
|
|
|
count -= stored;
|
|
|
|
if (count == 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
/* Store remaining entries into new message */
|
|
|
|
stored += store_imm_ass_rej_refs(new_rej,
|
|
|
|
&req_refs[stored], &wait_inds[stored],
|
|
|
|
count);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-27 09:25:35 +00:00
|
|
|
int bts_agch_enqueue(struct gsm_bts *bts, struct msgb *msg)
|
2011-03-04 13:05:20 +00:00
|
|
|
{
|
2012-01-12 23:40:04 +00:00
|
|
|
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
|
2014-02-14 20:15:31 +00:00
|
|
|
int hard_limit = 1000;
|
2014-02-20 17:45:45 +00:00
|
|
|
struct gsm48_imm_ass_rej *imm_ass_cmd = msgb_l3(msg);
|
2014-02-14 20:15:31 +00:00
|
|
|
|
|
|
|
if (btsb->agch_queue_length > hard_limit) {
|
|
|
|
LOGP(DSUM, LOGL_ERROR,
|
|
|
|
"AGCH: too many messages in queue, "
|
|
|
|
"refusing message type 0x%02x, length = %d/%d\n",
|
|
|
|
((struct gsm48_imm_ass *)msgb_l3(msg))->msg_type,
|
|
|
|
btsb->agch_queue_length, btsb->agch_max_queue_length);
|
|
|
|
|
|
|
|
btsb->agch_queue_rejected_msgs++;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2011-06-27 09:25:35 +00:00
|
|
|
|
2014-02-20 17:45:45 +00:00
|
|
|
if (btsb->agch_queue_length > 0) {
|
|
|
|
struct msgb *last_msg =
|
|
|
|
llist_entry(btsb->agch_queue.prev, struct msgb, list);
|
|
|
|
struct gsm48_imm_ass_rej *last_imm_ass_rej = msgb_l3(last_msg);
|
|
|
|
|
|
|
|
if (try_merge_imm_ass_rej(last_imm_ass_rej, imm_ass_cmd)) {
|
|
|
|
btsb->agch_queue_merged_msgs++;
|
|
|
|
msgb_free(msg);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-01-12 23:40:04 +00:00
|
|
|
msgb_enqueue(&btsb->agch_queue, msg);
|
2014-02-21 14:09:14 +00:00
|
|
|
btsb->agch_queue_length++;
|
2011-06-27 09:25:35 +00:00
|
|
|
|
|
|
|
return 0;
|
2011-03-04 13:05:20 +00:00
|
|
|
}
|
|
|
|
|
2011-06-27 09:25:35 +00:00
|
|
|
struct msgb *bts_agch_dequeue(struct gsm_bts *bts)
|
|
|
|
{
|
2012-01-12 23:40:04 +00:00
|
|
|
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
|
2014-02-21 14:09:14 +00:00
|
|
|
struct msgb *msg = msgb_dequeue(&btsb->agch_queue);
|
|
|
|
if (!msg)
|
|
|
|
return NULL;
|
2011-06-27 09:25:35 +00:00
|
|
|
|
2014-02-21 14:09:14 +00:00
|
|
|
btsb->agch_queue_length--;
|
|
|
|
return msg;
|
2011-06-27 09:25:35 +00:00
|
|
|
}
|
2012-12-26 17:55:54 +00:00
|
|
|
|
2014-02-14 20:15:31 +00:00
|
|
|
/*
|
|
|
|
* Remove lower prio messages if the queue has grown too long.
|
|
|
|
*
|
|
|
|
* \return 0 iff the number of messages in the queue would fit into the AGCH
|
|
|
|
* reserved part of the CCCH.
|
|
|
|
*/
|
|
|
|
static void compact_agch_queue(struct gsm_bts *bts)
|
|
|
|
{
|
|
|
|
struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
|
|
|
|
struct msgb *msg, *msg2;
|
|
|
|
int max_len, slope, offs;
|
|
|
|
int level_low = btsb->agch_queue_low_level;
|
|
|
|
int level_high = btsb->agch_queue_high_level;
|
|
|
|
int level_thres = btsb->agch_queue_thresh_level;
|
|
|
|
|
|
|
|
max_len = btsb->agch_max_queue_length;
|
|
|
|
|
|
|
|
if (max_len == 0)
|
|
|
|
max_len = 1;
|
|
|
|
|
|
|
|
if (btsb->agch_queue_length < max_len * level_thres / 100)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* p^
|
|
|
|
* 1+ /'''''
|
|
|
|
* | /
|
|
|
|
* | /
|
|
|
|
* 0+---/--+----+--> Q length
|
|
|
|
* low high max_len
|
|
|
|
*/
|
|
|
|
|
|
|
|
offs = max_len * level_low / 100;
|
|
|
|
if (level_high > level_low)
|
|
|
|
slope = 0x10000 * 100 / (level_high - level_low);
|
|
|
|
else
|
|
|
|
slope = 0x10000 * max_len; /* p_drop >= 1 if len > offs */
|
|
|
|
|
|
|
|
llist_for_each_entry_safe(msg, msg2, &btsb->agch_queue, list) {
|
|
|
|
struct gsm48_imm_ass *imm_ass_cmd = msgb_l3(msg);
|
|
|
|
int p_drop;
|
|
|
|
|
|
|
|
if (imm_ass_cmd->msg_type != GSM48_MT_RR_IMM_ASS_REJ)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* IMMEDIATE ASSIGN REJECT */
|
|
|
|
|
|
|
|
p_drop = (btsb->agch_queue_length - offs) * slope / max_len;
|
|
|
|
|
|
|
|
if ((random() & 0xffff) >= p_drop)
|
|
|
|
return;
|
|
|
|
|
|
|
|
llist_del(&msg->list);
|
|
|
|
btsb->agch_queue_length--;
|
|
|
|
msgb_free(msg);
|
|
|
|
|
|
|
|
btsb->agch_queue_dropped_msgs++;
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2014-02-21 14:09:15 +00:00
|
|
|
int bts_ccch_copy_msg(struct gsm_bts *bts, uint8_t *out_buf, struct gsm_time *gt,
|
|
|
|
int is_ag_res)
|
|
|
|
{
|
2014-02-14 20:15:31 +00:00
|
|
|
struct msgb *msg = NULL;
|
2014-02-21 14:09:15 +00:00
|
|
|
struct gsm_bts_role_bts *btsb = bts->role;
|
2014-02-14 20:15:31 +00:00
|
|
|
int rc = 0;
|
|
|
|
int is_empty = 1;
|
|
|
|
|
|
|
|
/* Do queue house keeping.
|
|
|
|
* This needs to be done every time a CCCH message is requested, since
|
|
|
|
* the queue max length is calculated based on the CCCH block rate and
|
|
|
|
* PCH messages also reduce the drain of the AGCH queue.
|
|
|
|
*/
|
|
|
|
compact_agch_queue(bts);
|
2014-02-21 14:09:15 +00:00
|
|
|
|
2014-02-14 20:15:31 +00:00
|
|
|
/* Check for paging messages first if this is PCH */
|
|
|
|
if (!is_ag_res)
|
2014-02-14 13:18:51 +00:00
|
|
|
rc = paging_gen_msg(btsb->paging_state, out_buf, gt, &is_empty);
|
|
|
|
|
2014-02-14 20:15:31 +00:00
|
|
|
/* Check whether the block may be overwritten */
|
|
|
|
if (!is_empty)
|
|
|
|
return rc;
|
2014-02-21 14:09:15 +00:00
|
|
|
|
|
|
|
msg = bts_agch_dequeue(bts);
|
|
|
|
if (!msg)
|
2014-02-14 20:15:31 +00:00
|
|
|
return rc;
|
2014-02-21 14:09:15 +00:00
|
|
|
|
2014-02-14 20:15:31 +00:00
|
|
|
/* Copy AGCH message */
|
2014-02-21 14:09:15 +00:00
|
|
|
memcpy(out_buf, msgb_l3(msg), msgb_l3len(msg));
|
|
|
|
rc = msgb_l3len(msg);
|
|
|
|
msgb_free(msg);
|
2014-02-14 13:18:51 +00:00
|
|
|
|
|
|
|
if (is_ag_res)
|
|
|
|
btsb->agch_queue_agch_msgs++;
|
|
|
|
else
|
|
|
|
btsb->agch_queue_pch_msgs++;
|
2014-02-21 14:09:15 +00:00
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2012-12-26 17:55:54 +00:00
|
|
|
int bts_supports_cipher(struct gsm_bts_role_bts *bts, int rsl_cipher)
|
|
|
|
{
|
|
|
|
int sup;
|
|
|
|
|
|
|
|
if (rsl_cipher < 1 || rsl_cipher > 8)
|
|
|
|
return -ENOTSUP;
|
|
|
|
|
|
|
|
/* No encryption is always supported */
|
|
|
|
if (rsl_cipher == 1)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
sup = (1 << (rsl_cipher - 2)) & bts->support.ciphers;
|
|
|
|
return sup > 0;
|
|
|
|
}
|