526 lines
15 KiB
C
526 lines
15 KiB
C
/* (C) 2008-2010 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 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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <netinet/in.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/statistics.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/gsm/abis_nm.h>
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#include <osmocom/codec/ecu.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/bts_trx.h>
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#include <osmo-bts/logging.h>
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const struct value_string gsm_pchant_names[13] = {
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{ GSM_PCHAN_NONE, "NONE" },
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{ GSM_PCHAN_CCCH, "CCCH" },
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{ GSM_PCHAN_CCCH_SDCCH4,"CCCH+SDCCH4" },
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{ GSM_PCHAN_TCH_F, "TCH/F" },
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{ GSM_PCHAN_TCH_H, "TCH/H" },
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{ GSM_PCHAN_SDCCH8_SACCH8C, "SDCCH8" },
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{ GSM_PCHAN_PDCH, "PDCH" },
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{ GSM_PCHAN_TCH_F_PDCH, "TCH/F_PDCH" },
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{ GSM_PCHAN_UNKNOWN, "UNKNOWN" },
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{ GSM_PCHAN_CCCH_SDCCH4_CBCH, "CCCH+SDCCH4+CBCH" },
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{ GSM_PCHAN_SDCCH8_SACCH8C_CBCH, "SDCCH8+CBCH" },
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{ GSM_PCHAN_OSMO_DYN, "TCH/F_TCH/H_SDCCH8_PDCH" },
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{ 0, NULL }
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};
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const struct value_string gsm_pchant_descs[13] = {
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{ GSM_PCHAN_NONE, "Physical Channel not configured" },
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{ GSM_PCHAN_CCCH, "FCCH + SCH + BCCH + CCCH (Comb. IV)" },
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{ GSM_PCHAN_CCCH_SDCCH4,
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"FCCH + SCH + BCCH + CCCH + 4 SDCCH + 2 SACCH (Comb. V)" },
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{ GSM_PCHAN_TCH_F, "TCH/F + FACCH/F + SACCH (Comb. I)" },
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{ GSM_PCHAN_TCH_H, "2 TCH/H + 2 FACCH/H + 2 SACCH (Comb. II)" },
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{ GSM_PCHAN_SDCCH8_SACCH8C, "8 SDCCH + 4 SACCH (Comb. VII)" },
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{ GSM_PCHAN_PDCH, "Packet Data Channel for GPRS/EDGE" },
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{ GSM_PCHAN_TCH_F_PDCH, "Dynamic TCH/F or GPRS PDCH" },
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{ GSM_PCHAN_UNKNOWN, "Unknown / Unsupported channel combination" },
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{ GSM_PCHAN_CCCH_SDCCH4_CBCH, "FCCH + SCH + BCCH + CCCH + CBCH + 3 SDCCH + 2 SACCH (Comb. V)" },
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{ GSM_PCHAN_SDCCH8_SACCH8C_CBCH, "7 SDCCH + 4 SACCH + CBCH (Comb. VII)" },
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{ GSM_PCHAN_OSMO_DYN, "Dynamic TCH/F or TCH/H or SDCCH/8 or GPRS PDCH" },
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{ 0, NULL }
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};
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const char *gsm_pchan_name(enum gsm_phys_chan_config c)
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{
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return get_value_string(gsm_pchant_names, c);
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}
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/* TODO: move to libosmocore, next to gsm_chan_t_names? */
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const char *gsm_lchant_name(enum gsm_chan_t c)
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{
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return get_value_string(gsm_chan_t_names, c);
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}
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static const struct value_string lchan_s_names[] = {
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{ LCHAN_S_NONE, "NONE" },
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{ LCHAN_S_ACT_REQ, "ACTIVATION REQUESTED" },
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{ LCHAN_S_ACTIVE, "ACTIVE" },
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{ LCHAN_S_REL_REQ, "RELEASE REQUESTED" },
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{ LCHAN_S_REL_ERR, "RELEASE DUE ERROR" },
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{ LCHAN_S_BROKEN, "BROKEN UNUSABLE" },
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{ 0, NULL }
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};
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const char *gsm_lchans_name(enum gsm_lchan_state s)
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{
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return get_value_string(lchan_s_names, s);
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}
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static char ts2str[255];
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char *gsm_ts_name(const struct gsm_bts_trx_ts *ts)
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{
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ")",
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GSM_TS_NAME_ARGS(ts));
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return ts2str;
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}
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/*! Log timeslot number with full pchan information */
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char *gsm_ts_and_pchan_name(const struct gsm_bts_trx_ts *ts)
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{
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switch (ts->pchan) {
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case GSM_PCHAN_OSMO_DYN:
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if (ts->dyn.pchan_is == ts->dyn.pchan_want)
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s as %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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gsm_pchan_name(ts->dyn.pchan_is));
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else
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s switching %s -> %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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gsm_pchan_name(ts->dyn.pchan_is),
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gsm_pchan_name(ts->dyn.pchan_want));
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break;
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case GSM_PCHAN_TCH_F_PDCH:
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if ((ts->flags & TS_F_PDCH_PENDING_MASK) == 0)
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s as %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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(ts->flags & TS_F_PDCH_ACTIVE)? "PDCH"
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: "TCH/F");
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else
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snprintf(ts2str, sizeof(ts2str),
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"(" GSM_TS_NAME_FMT ",pchan=%s switching %s -> %s)",
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GSM_TS_NAME_ARGS(ts),
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gsm_pchan_name(ts->pchan),
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(ts->flags & TS_F_PDCH_ACTIVE)? "PDCH"
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: "TCH/F",
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(ts->flags & TS_F_PDCH_ACT_PENDING)? "PDCH"
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: "TCH/F");
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break;
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default:
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snprintf(ts2str, sizeof(ts2str), "(" GSM_TS_NAME_FMT ",pchan=%s)",
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GSM_TS_NAME_ARGS(ts), gsm_pchan_name(ts->pchan));
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break;
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}
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return ts2str;
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}
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void gsm_lchan_name_update(struct gsm_lchan *lchan)
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{
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const struct gsm_bts_trx_ts *ts = lchan->ts;
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const struct gsm_bts_trx *trx = ts->trx;
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char *name;
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name = talloc_asprintf(trx, "(" GSM_TS_NAME_FMT ",ss=%u)",
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GSM_TS_NAME_ARGS(ts), lchan->nr);
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if (lchan->name != NULL)
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talloc_free(lchan->name);
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lchan->name = name;
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}
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/* See Table 10.5.25 of GSM04.08 */
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static uint8_t gsm_pchan2chan_nr(enum gsm_phys_chan_config pchan,
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uint8_t ts_nr, uint8_t lchan_nr)
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{
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uint8_t cbits, chan_nr;
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OSMO_ASSERT(pchan != GSM_PCHAN_OSMO_DYN);
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OSMO_ASSERT(pchan != GSM_PCHAN_TCH_F_PDCH);
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switch (pchan) {
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case GSM_PCHAN_TCH_F:
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OSMO_ASSERT(lchan_nr == 0);
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cbits = ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs;
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break;
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case GSM_PCHAN_PDCH:
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OSMO_ASSERT(lchan_nr == 0);
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cbits = ABIS_RSL_CHAN_NR_CBITS_OSMO_PDCH;
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break;
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case GSM_PCHAN_TCH_H:
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OSMO_ASSERT(lchan_nr < 2);
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cbits = ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(lchan_nr);
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break;
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case GSM_PCHAN_CCCH_SDCCH4:
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case GSM_PCHAN_CCCH_SDCCH4_CBCH:
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/*
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* As a special hack for BCCH, lchan_nr == 4 may be passed
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* here. This should never be sent in an RSL message.
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* See osmo-bts-xxx/oml.c:opstart_compl().
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*/
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if (lchan_nr == CCCH_LCHAN)
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cbits = ABIS_RSL_CHAN_NR_CBITS_BCCH;
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else {
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OSMO_ASSERT(lchan_nr < 4);
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cbits = ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(lchan_nr);
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}
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break;
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case GSM_PCHAN_SDCCH8_SACCH8C:
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case GSM_PCHAN_SDCCH8_SACCH8C_CBCH:
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OSMO_ASSERT(lchan_nr < 8);
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cbits = ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(lchan_nr);
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break;
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case GSM_PCHAN_CCCH:
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cbits = ABIS_RSL_CHAN_NR_CBITS_BCCH;
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break;
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case GSM_PCHAN_NONE:
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LOGP(DRSL, LOGL_ERROR, "Physical channel %s not expected!\n",
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gsm_pchan_name(pchan));
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cbits = 0x00;
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break;
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default:
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LOGP(DRSL, LOGL_ERROR, "Physical channel %s (0x%02x) not expected!\n",
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gsm_pchan_name(pchan), (int)pchan);
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/* OSMO_ASSERT(lchan_nr == 0);
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* FIXME: On octphy and litecell, we hit above assertion (see
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* Max's comment at https://gerrit.osmocom.org/589 ); disabled
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* for BTS until this is clarified; remove the #ifdef when it
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* is fixed. Tracked in OS#2906.
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*/
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#pragma message "fix caller that passes lchan_nr != 0"
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cbits = 0x10;
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break;
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}
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chan_nr = (cbits << 3) | (ts_nr & 0x7);
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return chan_nr;
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}
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uint8_t gsm_lchan2chan_nr(const struct gsm_lchan *lchan)
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{
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uint8_t chan_nr;
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switch (lchan->ts->pchan) {
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case GSM_PCHAN_OSMO_DYN:
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/* Return chan_nr reflecting the current TS pchan, either a standard TCH kind, or the
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* nonstandard value reflecting PDCH for Osmocom style dyn TS. */
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chan_nr = gsm_lchan_as_pchan2chan_nr(lchan, lchan->ts->dyn.pchan_is);
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break;
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case GSM_PCHAN_TCH_F_PDCH:
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/* For ip.access style dyn TS, we always want to use the chan_nr as if it was TCH/F.
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* We're using custom PDCH ACT and DEACT messages that use the usual chan_nr values. */
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chan_nr = gsm_lchan_as_pchan2chan_nr(lchan, GSM_PCHAN_TCH_F);
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break;
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default:
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chan_nr = gsm_pchan2chan_nr(lchan->ts->pchan, lchan->ts->nr, lchan->nr);
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break;
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}
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/* VAMOS: if this lchan belongs to a shadow timeslot, we must reflect
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* this in the channel number. Convert it to Osmocom specific value. */
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if (lchan->ts->vamos.is_shadow)
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chan_nr |= RSL_CHAN_OSMO_VAMOS_MASK;
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return chan_nr;
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}
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uint8_t gsm_lchan_as_pchan2chan_nr(const struct gsm_lchan *lchan,
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enum gsm_phys_chan_config as_pchan)
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{
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if (lchan->ts->pchan == GSM_PCHAN_OSMO_DYN
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&& as_pchan == GSM_PCHAN_PDCH)
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return RSL_CHAN_OSMO_PDCH | (lchan->ts->nr & ~RSL_CHAN_NR_MASK);
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return gsm_pchan2chan_nr(as_pchan, lchan->ts->nr, lchan->nr);
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}
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/* Called by the model specific code every 104 TDMA frames (SACCH period) */
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void gsm_lchan_interf_meas_push(struct gsm_lchan *lchan, int dbm)
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{
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const uint8_t meas_num = lchan->meas.interf_meas_num;
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if (meas_num >= ARRAY_SIZE(lchan->meas.interf_meas_dbm)) {
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LOGPLCHAN(lchan, DL1C, LOGL_ERROR, "Not enough room "
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"to store interference report (%ddBm)\n", dbm);
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return;
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}
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lchan->meas.interf_meas_dbm[meas_num] = dbm;
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lchan->meas.interf_meas_num++;
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}
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/* Called by the higher layers every Intave * 104 TDMA frames */
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int gsm_lchan_interf_meas_calc_band(struct gsm_lchan *lchan)
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{
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const uint8_t meas_num = lchan->meas.interf_meas_num;
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const struct gsm_bts *bts = lchan->ts->trx->bts;
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int b, meas_avg, meas_sum = 0;
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/* There must be at least one sample */
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if (meas_num == 0)
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return -EAGAIN;
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/* Calculate the sum of all collected samples (in -x dBm) */
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while (lchan->meas.interf_meas_num) {
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uint8_t i = --lchan->meas.interf_meas_num;
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meas_sum += lchan->meas.interf_meas_dbm[i];
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}
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/* Calculate the average of all collected samples */
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meas_avg = meas_sum / (int) meas_num;
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/* Determine the band using interference boundaries from BSC */
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for (b = 0; b < ARRAY_SIZE(bts->interference.boundary); b++) {
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if (meas_avg >= bts->interference.boundary[b])
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break; /* Current 'b' is the band value */
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}
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LOGPLCHAN(lchan, DL1C, LOGL_DEBUG,
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"Interference AVG: %ddBm (band %d, samples %u)\n",
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meas_avg, b, meas_num);
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return b;
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}
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/* determine logical channel based on TRX and channel number IE */
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struct gsm_lchan *rsl_lchan_lookup(struct gsm_bts_trx *trx, uint8_t chan_nr,
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int *rc)
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{
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uint8_t ts_nr = chan_nr & 0x07;
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uint8_t cbits = chan_nr >> 3;
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uint8_t lch_idx;
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struct gsm_bts_trx_ts *ts = &trx->ts[ts_nr];
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bool ok = true;
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if (rc)
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*rc = -EINVAL;
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switch (cbits) {
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Bm_ACCHs:
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if (ts->vamos.peer == NULL)
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return NULL;
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ts = ts->vamos.peer;
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/* fall-through */
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case ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs:
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lch_idx = 0; /* TCH/F */
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if (ts->pchan != GSM_PCHAN_TCH_F &&
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ts->pchan != GSM_PCHAN_PDCH &&
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ts->pchan != GSM_PCHAN_TCH_F_PDCH &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Lm_ACCHs(0):
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_VAMOS_Lm_ACCHs(1):
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if (ts->vamos.peer == NULL)
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return NULL;
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ts = ts->vamos.peer;
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/* fall-through */
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case ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(0):
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case ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(1):
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lch_idx = cbits & 0x1; /* TCH/H */
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if (ts->pchan != GSM_PCHAN_TCH_H &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(0):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(1):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(2):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(3):
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lch_idx = cbits & 0x3; /* SDCCH/4 */
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if (ts->pchan != GSM_PCHAN_CCCH_SDCCH4 &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4_CBCH)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(0):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(1):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(2):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(3):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(4):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(5):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(6):
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case ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(7):
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lch_idx = cbits & 0x7; /* SDCCH/8 */
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if (ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C &&
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ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C_CBCH &&
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ts->pchan != GSM_PCHAN_OSMO_DYN)
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ok = false;
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break;
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case ABIS_RSL_CHAN_NR_CBITS_BCCH:
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case ABIS_RSL_CHAN_NR_CBITS_RACH:
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case ABIS_RSL_CHAN_NR_CBITS_PCH_AGCH:
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lch_idx = 0;
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if (ts->pchan != GSM_PCHAN_CCCH &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4 &&
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ts->pchan != GSM_PCHAN_CCCH_SDCCH4_CBCH)
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ok = false;
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/* FIXME: we should not return first sdcch4 !!! */
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break;
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case ABIS_RSL_CHAN_NR_CBITS_OSMO_PDCH:
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|
lch_idx = 0;
|
|
if (ts->pchan != GSM_PCHAN_OSMO_DYN)
|
|
ok = false;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
if (rc && ok)
|
|
*rc = 0;
|
|
|
|
return &ts->lchan[lch_idx];
|
|
}
|
|
|
|
static const uint8_t subslots_per_pchan[] = {
|
|
[GSM_PCHAN_NONE] = 0,
|
|
[GSM_PCHAN_CCCH] = 0,
|
|
[GSM_PCHAN_PDCH] = 0,
|
|
[GSM_PCHAN_CCCH_SDCCH4] = 4,
|
|
[GSM_PCHAN_TCH_F] = 1,
|
|
[GSM_PCHAN_TCH_H] = 2,
|
|
[GSM_PCHAN_SDCCH8_SACCH8C] = 8,
|
|
[GSM_PCHAN_CCCH_SDCCH4_CBCH] = 4,
|
|
[GSM_PCHAN_SDCCH8_SACCH8C_CBCH] = 8,
|
|
/*
|
|
* GSM_PCHAN_TCH_F_PDCH and GSM_PCHAN_OSMO_DYN should not be
|
|
* part of this, those TS are handled according to their dynamic state.
|
|
*/
|
|
};
|
|
|
|
/*! Return the actual pchan type, also heeding dynamic TS. */
|
|
enum gsm_phys_chan_config ts_pchan(const struct gsm_bts_trx_ts *ts)
|
|
{
|
|
switch (ts->pchan) {
|
|
case GSM_PCHAN_OSMO_DYN:
|
|
return ts->dyn.pchan_is;
|
|
case GSM_PCHAN_TCH_F_PDCH:
|
|
if (ts->flags & TS_F_PDCH_ACTIVE)
|
|
return GSM_PCHAN_PDCH;
|
|
else
|
|
return GSM_PCHAN_TCH_F;
|
|
default:
|
|
return ts->pchan;
|
|
}
|
|
}
|
|
|
|
/*! According to ts->pchan and possibly ts->dyn_pchan, return the number of
|
|
* logical channels available in the timeslot. */
|
|
uint8_t ts_subslots(const struct gsm_bts_trx_ts *ts)
|
|
{
|
|
return subslots_per_pchan[ts_pchan(ts)];
|
|
}
|
|
|
|
static bool pchan_is_tch(enum gsm_phys_chan_config pchan)
|
|
{
|
|
switch (pchan) {
|
|
case GSM_PCHAN_TCH_F:
|
|
case GSM_PCHAN_TCH_H:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool ts_is_tch(const struct gsm_bts_trx_ts *ts)
|
|
{
|
|
return pchan_is_tch(ts_pchan(ts));
|
|
}
|
|
|
|
const struct value_string lchan_ciph_state_names[] = {
|
|
{ LCHAN_CIPH_NONE, "NONE" },
|
|
{ LCHAN_CIPH_RX_REQ, "RX_REQ" },
|
|
{ LCHAN_CIPH_RX_CONF, "RX_CONF" },
|
|
{ LCHAN_CIPH_RXTX_REQ, "RXTX_REQ" },
|
|
{ LCHAN_CIPH_RX_CONF_TX_REQ, "RX_CONF_TX_REQ" },
|
|
{ LCHAN_CIPH_RXTX_CONF, "RXTX_CONF" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* determine the ECU codec constant for the codec used by given lchan */
|
|
int lchan2ecu_codec(const struct gsm_lchan *lchan)
|
|
{
|
|
const struct gsm_bts_trx_ts *ts = lchan->ts;
|
|
|
|
switch (lchan->tch_mode) {
|
|
case GSM48_CMODE_SPEECH_V1:
|
|
if (ts_pchan(ts) == GSM_PCHAN_TCH_H)
|
|
return OSMO_ECU_CODEC_HR;
|
|
else
|
|
return OSMO_ECU_CODEC_FR;
|
|
break;
|
|
case GSM48_CMODE_SPEECH_EFR:
|
|
return OSMO_ECU_CODEC_EFR;
|
|
case GSM48_CMODE_SPEECH_AMR:
|
|
return OSMO_ECU_CODEC_AMR;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Default MS/BS Power Control parameters (see 3GPP TS 45.008, table A.1) */
|
|
const struct gsm_power_ctrl_params power_ctrl_params_def = {
|
|
/* Power increasing/reducing step size (optimal defaults) */
|
|
.inc_step_size_db = 4, /* quickly increase MS/BS power */
|
|
.red_step_size_db = 2, /* slowly decrease MS/BS power */
|
|
|
|
/* RxLev measurement parameters */
|
|
.rxlev_meas = {
|
|
/* Thresholds for RxLev (see 3GPP TS 45.008, A.3.2.1) */
|
|
.lower_thresh = 32, /* L_RXLEV_XX_P (-78 dBm) */
|
|
.upper_thresh = 38, /* U_RXLEV_XX_P (-72 dBm) */
|
|
|
|
/* NOTE: only Osmocom specific EWMA is supported */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_OSMO_EWMA,
|
|
.ewma.alpha = 50, /* Smoothing factor 50% */
|
|
},
|
|
|
|
/* RxQual measurement parameters */
|
|
.rxqual_meas = {
|
|
/* Thresholds for RxQual (see 3GPP TS 45.008, A.3.2.1) */
|
|
.lower_thresh = 3, /* L_RXQUAL_XX_P (0.8% <= BER < 1.6%) */
|
|
.upper_thresh = 0, /* U_RXQUAL_XX_P (BER < 0.2%) */
|
|
|
|
/* FIXME: RxQual averaging is not yet implemented */
|
|
.algo = GSM_PWR_CTRL_MEAS_AVG_ALGO_NONE,
|
|
},
|
|
};
|