493 lines
16 KiB
C
493 lines
16 KiB
C
/*
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* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
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* (C) 2015-2017 by Harald Welte <laforge@gnumonks.org>
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* Contributions by sysmocom - s.f.m.c. GmbH
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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 <errno.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/gsm/gsm0502.h>
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#include <osmocom/codec/codec.h>
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#include <osmocom/codec/ecu.h>
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#include <osmocom/coding/gsm0503_coding.h>
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#include <osmocom/coding/gsm0503_amr_dtx.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/l1sap.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/scheduler.h>
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#include <osmo-bts/scheduler_backend.h>
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#include <osmo-bts/msg_utils.h>
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#include <sched_utils.h>
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#include <loops.h>
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/*! \brief a single TCH/H burst was received by the PHY, process it */
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int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
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{
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struct l1sched_chan_state *chan_state = &l1ts->chan_state[bi->chan];
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struct gsm_lchan *lchan = chan_state->lchan;
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sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
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uint8_t *mask = &chan_state->ul_mask;
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uint8_t rsl_cmode = chan_state->rsl_cmode;
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uint8_t tch_mode = chan_state->tch_mode;
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uint8_t tch_data[128]; /* just to be safe */
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int rc, amr = 0;
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int n_errors = 0;
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int n_bits_total = 0;
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bool bfi_flag = false;
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/* Note on FN-10: If we are at FN 10, we decoded an even aligned
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* TCH/FACCH frame, because our burst buffer carries 6 bursts.
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* Even FN ending at: 10,11,19,20,2,3
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*/
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int fn_is_odd = (((bi->fn + 26 - 10) % 26) >> 2) & 1;
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enum sched_meas_avg_mode meas_avg_mode = SCHED_MEAS_AVG_M_S4N4;
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struct l1sched_meas_set meas_avg;
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unsigned int fn_begin;
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unsigned int fn_tch_end;
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uint16_t ber10k;
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uint8_t is_sub = 0;
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uint8_t ft;
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bool mask_stolen_tch_block = false;
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bool fn_is_cmi;
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/* If handover RACH detection is turned on, treat this burst as an Access Burst.
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* Handle NOPE.ind as usually to ensure proper Uplink measurement reporting. */
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if (chan_state->ho_rach_detect == 1 && ~bi->flags & TRX_BI_F_NOPE_IND)
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return rx_rach_fn(l1ts, bi);
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LOGL1SB(DL1P, LOGL_DEBUG, l1ts, bi, "Received TCH/H, bid=%u\n", bi->bid);
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/* allocate burst memory, if not already */
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if (!*bursts_p) {
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*bursts_p = talloc_zero_size(l1ts, 696);
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if (!*bursts_p)
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return -ENOMEM;
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}
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/* clear burst */
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if (bi->bid == 0) {
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memset(*bursts_p + 464, 0, 232);
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*mask = 0x0;
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}
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/* update mask */
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*mask |= (1 << bi->bid);
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/* store measurements */
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trx_sched_meas_push(chan_state, bi);
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/* copy burst to end of buffer of 6 bursts */
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burst = *bursts_p + bi->bid * 116 + 464;
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if (bi->burst_len > 0) {
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memcpy(burst, bi->burst + 3, 58);
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memcpy(burst + 58, bi->burst + 87, 58);
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} else
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memset(burst, 0, 116);
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/* wait until complete set of bursts */
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if (bi->bid != 1)
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return 0;
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/* check for complete set of bursts */
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if ((*mask & 0x3) != 0x3) {
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LOGL1SB(DL1P, LOGL_NOTICE, l1ts, bi,
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"Received incomplete frame (%u/%u)\n",
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bi->fn % l1ts->mf_period, l1ts->mf_period);
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}
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*mask = 0x0;
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/* skip decoding of the last 4 bursts of FACCH/H */
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if (chan_state->ul_ongoing_facch) {
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chan_state->ul_ongoing_facch = 0;
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memcpy(*bursts_p, *bursts_p + 232, 232);
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memcpy(*bursts_p + 232, *bursts_p + 464, 232);
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/* we have already sent the first BFI when a FACCH/H frame
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* was decoded (see below), now send the second one. */
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ber10k = 0;
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memset(&meas_avg, 0, sizeof(meas_avg));
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/* In order to provide an even stream of measurement reports
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* we ask the code below to mask the missing TCH/H block
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* measurement report with the FACCH measurement results. */
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mask_stolen_tch_block = true;
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goto bfi;
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}
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/* decode
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* also shift buffer by 4 bursts for interleaving */
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switch ((rsl_cmode != RSL_CMOD_SPD_SPEECH) ? GSM48_CMODE_SPEECH_V1
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: tch_mode) {
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case GSM48_CMODE_SPEECH_V1: /* HR or signalling */
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/* Note on FN-10: If we are at FN 10, we decoded an even aligned
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* TCH/FACCH frame, because our burst buffer carries 6 bursts.
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* Even FN ending at: 10,11,19,20,2,3
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*/
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rc = gsm0503_tch_hr_decode(tch_data, *bursts_p,
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fn_is_odd, &n_errors, &n_bits_total);
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if (rc == (GSM_HR_BYTES + 1)) { /* only for valid *speech* frames */
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/* gsm0503_tch_hr_decode() prepends a ToC octet (see RFC5993), skip it */
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bool is_sid = osmo_hr_check_sid(&tch_data[1], GSM_HR_BYTES);
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if (is_sid) /* Mark SID frames as such: F = 0, FT = 010 */
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tch_data[0] = (0x02 << 4);
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lchan_set_marker(is_sid, lchan); /* DTXu */
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}
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break;
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case GSM48_CMODE_SPEECH_AMR: /* AMR */
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/* the first FN 0,8,17 or 1,9,18 defines that CMI is included
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* in frame, the first FN 4,13,21 or 5,14,22 defines that CMR
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* is included in frame.
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*/
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/* See comment in function rx_tchf_fn() */
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switch (chan_state->amr_last_dtx) {
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case AHS_ONSET:
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case AHS_SID_FIRST_INH:
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case AHS_SID_UPDATE_INH:
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lchan_set_marker(false, lchan);
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break;
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}
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/* Calculate the frame number where the block begins */
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if (bi->fn % 13 < 4)
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fn_tch_end = GSM_TDMA_FN_SUB(bi->fn, 5);
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else
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fn_tch_end = GSM_TDMA_FN_SUB(bi->fn, 4);
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if (lchan->nr == 0)
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fn_begin = gsm0502_fn_remap(fn_tch_end, FN_REMAP_TCH_H0);
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else
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fn_begin = gsm0502_fn_remap(fn_tch_end, FN_REMAP_TCH_H1);
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fn_is_cmi = ul_amr_fn_is_cmi(fn_begin);
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/* See comment in function rx_tchf_fn() */
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amr = 2;
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rc = gsm0503_tch_ahs_decode_dtx(tch_data + amr, *bursts_p,
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fn_is_odd, !fn_is_cmi, chan_state->codec,
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chan_state->codecs, &chan_state->ul_ft,
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&chan_state->ul_cmr, &n_errors, &n_bits_total, &chan_state->amr_last_dtx);
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/* Tag all frames that are not regular AMR voice frames
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as SUB-Frames */
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if (chan_state->amr_last_dtx != AMR_OTHER) {
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LOGL1SB(DL1P, LOGL_DEBUG, l1ts, bi, "Received AMR SID frame: %s\n",
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gsm0503_amr_dtx_frame_name(chan_state->amr_last_dtx));
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is_sub = 1;
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}
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/* See comment in function rx_tchf_fn() */
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switch (chan_state->amr_last_dtx) {
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case AHS_SID_FIRST_P1:
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case AHS_SID_FIRST_P2:
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case AHS_SID_UPDATE:
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case AHS_SID_UPDATE_CN:
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lchan_set_marker(true, lchan);
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lchan->rtp_tx_marker = false;
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break;
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}
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switch (chan_state->amr_last_dtx) {
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case AHS_SID_FIRST_P1:
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case AHS_SID_FIRST_P2:
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case AHS_SID_UPDATE:
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case AHS_SID_UPDATE_CN:
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case AHS_SID_FIRST_INH:
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case AHS_SID_UPDATE_INH:
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meas_avg_mode = SCHED_MEAS_AVG_M_S6N2;
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break;
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case AHS_ONSET:
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meas_avg_mode = SCHED_MEAS_AVG_M_S4N2;
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break;
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}
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if (rc)
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trx_loop_amr_input(chan_state, n_errors, n_bits_total);
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/* only good speech frames get rtp header */
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if (rc != GSM_MACBLOCK_LEN && rc >= 4) {
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if (chan_state->amr_last_dtx == AMR_OTHER) {
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ft = chan_state->codec[chan_state->ul_ft];
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} else {
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/* SID frames will always get Frame Type Index 8 (AMR_SID) */
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ft = AMR_SID;
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}
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rc = osmo_amr_rtp_enc(tch_data,
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chan_state->codec[chan_state->ul_cmr],
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ft, AMR_GOOD);
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}
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break;
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default:
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LOGL1SB(DL1P, LOGL_ERROR, l1ts, bi,
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"TCH mode %u invalid, please fix!\n",
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tch_mode);
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return -EINVAL;
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}
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memcpy(*bursts_p, *bursts_p + 232, 232);
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memcpy(*bursts_p + 232, *bursts_p + 464, 232);
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ber10k = compute_ber10k(n_bits_total, n_errors);
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/* average measurements of the last N (depends on mode) bursts */
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if (rc == GSM_MACBLOCK_LEN)
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meas_avg_mode = SCHED_MEAS_AVG_M_S6N6;
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trx_sched_meas_avg(chan_state, &meas_avg, meas_avg_mode);
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/* Check if the frame is bad */
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if (rc < 0) {
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LOGL1SB(DL1P, LOGL_NOTICE, l1ts, bi, "Received bad data (%u/%u)\n",
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bi->fn % l1ts->mf_period, l1ts->mf_period);
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bfi_flag = true;
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} else if (rc < 4) {
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LOGL1SB(DL1P, LOGL_NOTICE, l1ts, bi,
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"Received bad data (%u/%u) with invalid codec mode %d\n",
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bi->fn % l1ts->mf_period, l1ts->mf_period, rc);
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bfi_flag = true;
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}
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if (rc != GSM_MACBLOCK_LEN && lchan->ecu_state)
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osmo_ecu_frame_in(lchan->ecu_state, bfi_flag, tch_data, rc);
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if (bfi_flag)
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goto bfi;
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/* FACCH */
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if (rc == GSM_MACBLOCK_LEN) {
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chan_state->ul_ongoing_facch = 1;
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if (lchan->nr == 0)
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fn_begin = gsm0502_fn_remap(bi->fn, FN_REMAP_FACCH_H0);
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else
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fn_begin = gsm0502_fn_remap(bi->fn, FN_REMAP_FACCH_H1);
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_sched_compose_ph_data_ind(l1ts, fn_begin, bi->chan,
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tch_data + amr, GSM_MACBLOCK_LEN,
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meas_avg.rssi, meas_avg.toa256,
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meas_avg.ci_cb, ber10k,
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PRES_INFO_UNKNOWN);
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/* Keep a copy of the measurement results of the last FACCH
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* transmission in order to be able to create a replacement
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* measurement result for the one missing TCH block
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* measurement */
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memcpy(&chan_state->meas_avg_facch, &meas_avg, sizeof(meas_avg));
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chan_state->ber10k_facch = ber10k;
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/* Invalidate the current measurement result to prevent the
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* code below from handing up the current measurement a second
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* time. */
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memset(&meas_avg, 0, sizeof(meas_avg));
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bfi:
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/* A FACCH/H frame replaces two speech frames, so we need to send two BFIs.
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* One is sent here, another will be sent two bursts later (see above). */
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if (rsl_cmode == RSL_CMOD_SPD_SPEECH) {
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/* indicate bad frame */
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if (lchan->tch.dtx.ul_sid) {
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/* DTXu: pause in progress. Push empty payload to upper layers */
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rc = 0;
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goto compose_l1sap;
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}
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/* If there is an ECU active on this channel, use its output */
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if (lchan->ecu_state) {
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rc = osmo_ecu_frame_out(lchan->ecu_state, tch_data);
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if (rc >= 0) /* Otherwise we send a BFI */
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goto compose_l1sap;
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}
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switch (tch_mode) {
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case GSM48_CMODE_SPEECH_V1: /* HR */
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tch_data[0] = 0x70; /* F = 0, FT = 111 */
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memset(tch_data + 1, 0, 14);
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rc = 15;
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break;
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case GSM48_CMODE_SPEECH_AMR: /* AMR */
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rc = osmo_amr_rtp_enc(tch_data,
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chan_state->codec[chan_state->ul_cmr],
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chan_state->codec[chan_state->ul_ft],
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AMR_BAD);
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if (rc < 2) {
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LOGL1SB(DL1P, LOGL_ERROR, l1ts, bi,
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"Failed to encode AMR_BAD frame (rc=%d), "
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"not sending BFI\n", rc);
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return -EINVAL;
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}
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memset(tch_data + 2, 0, rc - 2);
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break;
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default:
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LOGL1SB(DL1P, LOGL_ERROR, l1ts, bi,
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"TCH mode %u invalid, please fix!\n", tch_mode);
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return -EINVAL;
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}
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}
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}
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if (rsl_cmode != RSL_CMOD_SPD_SPEECH)
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return 0;
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compose_l1sap:
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/* TCH or BFI */
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/* The input to gsm0502_fn_remap() needs to get the frame number we
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* got two bursts ago. The reason for this is that the burst shift
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* buffer we use for decoding is 6 bursts wide (one SACCH block) but
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* TCH/H blocks are only 4 bursts wide. The decoder functions look
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* at the beginning of the buffer while we shift into it at the end,
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* this means that TCH/H blocks always decode delayed by two frame
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* number positions late. To calculatue the ending frame number of
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* the TCH/H we need to subtract 4 or 5 frames if there was a SACCH
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* in between. (Note: this is TCH/H, 4 frames ==> 2 bursts) */
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if (bi->fn % 13 < 4)
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fn_tch_end = GSM_TDMA_FN_SUB(bi->fn, 5);
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else
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fn_tch_end = GSM_TDMA_FN_SUB(bi->fn, 4);
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if (lchan->nr == 0)
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fn_begin = gsm0502_fn_remap(fn_tch_end, FN_REMAP_TCH_H0);
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else
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fn_begin = gsm0502_fn_remap(fn_tch_end, FN_REMAP_TCH_H1);
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/* A FACCH/H transmission takes out two TCH/H voice blocks and the
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* related measurement results. The first measurement result is handed
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* up directly with the FACCH (see above), the second one needs to be
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* compensated by filling the gap with the measurement result we got
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* from the FACCH transmission. */
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if (mask_stolen_tch_block) {
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memcpy(&meas_avg, &chan_state->meas_avg_facch, sizeof(meas_avg));
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ber10k = chan_state->ber10k_facch;
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memset(&chan_state->meas_avg_facch, 0, sizeof(meas_avg));
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chan_state->ber10k_facch = 0;
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}
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return _sched_compose_tch_ind(l1ts, fn_begin, bi->chan, tch_data, rc,
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/* FIXME: what should we use for BFI here? */
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bfi_flag ? bi->toa256 : meas_avg.toa256, ber10k,
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bfi_flag ? bi->rssi : meas_avg.rssi,
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bfi_flag ? bi->ci_cb : meas_avg.ci_cb,
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is_sub);
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}
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/* common section for generation of TCH bursts (TCH/H and TCH/F).
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* FIXME: this function is over-complicated, refactor / get rid of it. */
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extern void tx_tch_common(struct l1sched_ts *l1ts,
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const struct trx_dl_burst_req *br,
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struct msgb **_msg_tch, struct msgb **_msg_facch);
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/* obtain a to-be-transmitted TCH/H (Half Traffic Channel) burst */
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int tx_tchh_fn(struct l1sched_ts *l1ts, struct trx_dl_burst_req *br)
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{
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struct msgb *msg_tch = NULL, *msg_facch = NULL;
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struct l1sched_chan_state *chan_state = &l1ts->chan_state[br->chan];
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uint8_t tch_mode = chan_state->tch_mode;
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ubit_t *burst, **bursts_p = &chan_state->dl_bursts;
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/* send burst, if we already got a frame */
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if (br->bid > 0) {
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if (!*bursts_p)
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return -ENODEV;
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goto send_burst;
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}
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/* get TCH and/or FACCH */
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tx_tch_common(l1ts, br, &msg_tch, &msg_facch);
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/* check for FACCH alignment */
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if (msg_facch && ((((br->fn + 4) % 26) >> 2) & 1)) {
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LOGL1SB(DL1P, LOGL_ERROR, l1ts, br,
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"Cannot transmit FACCH starting on even frames, please fix RTS!\n");
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msgb_free(msg_facch);
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msg_facch = NULL;
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}
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/* BURST BYPASS */
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/* allocate burst memory, if not already,
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* otherwise shift buffer by 2 bursts for interleaving */
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if (!*bursts_p) {
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*bursts_p = talloc_zero_size(l1ts, 696);
|
|
if (!*bursts_p)
|
|
return -ENOMEM;
|
|
} else {
|
|
memcpy(*bursts_p, *bursts_p + 232, 232);
|
|
if (chan_state->dl_ongoing_facch) {
|
|
memcpy(*bursts_p + 232, *bursts_p + 464, 232);
|
|
memset(*bursts_p + 464, 0, 232);
|
|
} else {
|
|
memset(*bursts_p + 232, 0, 232);
|
|
}
|
|
}
|
|
|
|
/* no message at all, send a dummy L2 frame on FACCH */
|
|
if (!msg_tch && !msg_facch && !chan_state->dl_ongoing_facch) {
|
|
static const uint8_t dummy[GSM_MACBLOCK_LEN] = {
|
|
0x03, 0x03, 0x01, /* TODO: use randomized padding */
|
|
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
|
|
0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
|
|
};
|
|
|
|
LOGL1SB(DL1P, LOGL_INFO, l1ts, br, "No TCH or FACCH prim for transmit.\n");
|
|
gsm0503_tch_hr_encode(*bursts_p, dummy, sizeof(dummy));
|
|
goto send_burst;
|
|
}
|
|
|
|
/* encode bursts (prioritize FACCH) */
|
|
if (msg_facch) {
|
|
gsm0503_tch_hr_encode(*bursts_p, msg_facch->l2h, msgb_l2len(msg_facch));
|
|
chan_state->dl_ongoing_facch = 1; /* first of two TCH frames */
|
|
chan_state->dl_facch_bursts = 6;
|
|
} else if (chan_state->dl_ongoing_facch) /* second of two TCH frames */
|
|
chan_state->dl_ongoing_facch = 0; /* we are done with FACCH */
|
|
else if (tch_mode == GSM48_CMODE_SPEECH_AMR)
|
|
/* the first FN 4,13,21 or 5,14,22 defines that CMI is included
|
|
* in frame, the first FN 0,8,17 or 1,9,18 defines that CMR is
|
|
* included in frame. */
|
|
gsm0503_tch_ahs_encode(*bursts_p, msg_tch->l2h + 2,
|
|
msgb_l2len(msg_tch) - 2, !dl_amr_fn_is_cmi(br->fn),
|
|
chan_state->codec, chan_state->codecs,
|
|
chan_state->dl_ft,
|
|
chan_state->dl_cmr);
|
|
else
|
|
gsm0503_tch_hr_encode(*bursts_p, msg_tch->l2h, msgb_l2len(msg_tch));
|
|
|
|
/* free message */
|
|
if (msg_tch)
|
|
msgb_free(msg_tch);
|
|
if (msg_facch)
|
|
msgb_free(msg_facch);
|
|
|
|
send_burst:
|
|
/* compose burst */
|
|
burst = *bursts_p + br->bid * 116;
|
|
memcpy(br->burst + 3, burst, 58);
|
|
memcpy(br->burst + 61, TRX_GMSK_NB_TSC(br), 26);
|
|
memcpy(br->burst + 87, burst + 58, 58);
|
|
|
|
br->burst_len = GSM_BURST_LEN;
|
|
|
|
if (chan_state->dl_facch_bursts > 0) {
|
|
chan_state->dl_facch_bursts--;
|
|
br->flags |= TRX_BR_F_FACCH;
|
|
}
|
|
|
|
LOGL1SB(DL1P, LOGL_DEBUG, l1ts, br, "Transmitting burst=%u.\n", br->bid);
|
|
|
|
return 0;
|
|
}
|