2018-08-14 18:17:10 +00:00
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/*
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* OsmocomBB <-> SDR connection bridge
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* TDMA scheduler: handlers for DL / UL bursts on logical channels
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*
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2020-03-01 19:55:01 +00:00
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* (C) 2018-2020 by Vadim Yanitskiy <axilirator@gmail.com>
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2018-08-12 21:48:14 +00:00
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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2018-08-14 18:17:10 +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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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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2018-08-12 21:48:14 +00:00
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#include <string.h>
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2018-08-14 18:17:10 +00:00
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#include <stdint.h>
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#include <stdbool.h>
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2018-08-12 21:48:14 +00:00
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#include <osmocom/core/logging.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/coding/gsm0503_coding.h>
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#include <osmocom/codec/codec.h>
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#include "l1ctl_proto.h"
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2018-08-14 18:17:10 +00:00
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#include "scheduler.h"
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#include "sched_trx.h"
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2018-08-12 21:48:14 +00:00
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#include "logging.h"
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#include "trx_if.h"
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#include "l1ctl.h"
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2018-08-14 18:17:10 +00:00
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static const uint8_t tch_h0_traffic_block_map[3][4] = {
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/* B0(0,2,4,6), B1(4,6,8,10), B2(8,10,0,2) */
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{ 0, 2, 4, 6 },
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{ 4, 6, 8, 10 },
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{ 8, 10, 0, 2 },
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};
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static const uint8_t tch_h1_traffic_block_map[3][4] = {
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/* B0(1,3,5,7), B1(5,7,9,11), B2(9,11,1,3) */
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{ 1, 3, 5, 7 },
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{ 5, 7, 9, 11 },
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{ 9, 11, 1, 3 },
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};
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static const uint8_t tch_h0_dl_facch_block_map[3][6] = {
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/* B0(4,6,8,10,13,15), B1(13,15,17,19,21,23), B2(21,23,0,2,4,6) */
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{ 4, 6, 8, 10, 13, 15 },
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{ 13, 15, 17, 19, 21, 23 },
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{ 21, 23, 0, 2, 4, 6 },
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};
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static const uint8_t tch_h0_ul_facch_block_map[3][6] = {
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/* B0(0,2,4,6,8,10), B1(8,10,13,15,17,19), B2(17,19,21,23,0,2) */
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{ 0, 2, 4, 6, 8, 10 },
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{ 8, 10, 13, 15, 17, 19 },
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{ 17, 19, 21, 23, 0, 2 },
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};
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static const uint8_t tch_h1_dl_facch_block_map[3][6] = {
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/* B0(5,7,9,11,14,16), B1(14,16,18,20,22,24), B2(22,24,1,3,5,7) */
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{ 5, 7, 9, 11, 14, 16 },
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{ 14, 16, 18, 20, 22, 24 },
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{ 22, 24, 1, 3, 5, 7 },
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};
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const uint8_t tch_h1_ul_facch_block_map[3][6] = {
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/* B0(1,3,5,7,9,11), B1(9,11,14,16,18,20), B2(18,20,22,24,1,3) */
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{ 1, 3, 5, 7, 9, 11 },
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{ 9, 11, 14, 16, 18, 20 },
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{ 18, 20, 22, 24, 1, 3 },
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};
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/**
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* Can a TCH/H block transmission be initiated / finished
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* on a given frame number and a given channel type?
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*
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* See GSM 05.02, clause 7, table 1
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*
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* @param chan channel type (TRXC_TCHH_0 or TRXC_TCHH_1)
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* @param fn the current frame number
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* @param ul Uplink or Downlink?
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* @param facch FACCH/H or traffic?
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* @param start init or end of transmission?
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* @return true (yes) or false (no)
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*/
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bool sched_tchh_block_map_fn(enum trx_lchan_type chan,
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uint32_t fn, bool ul, bool facch, bool start)
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{
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uint8_t fn_mf;
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int i = 0;
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/* Just to be sure */
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OSMO_ASSERT(chan == TRXC_TCHH_0 || chan == TRXC_TCHH_1);
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/* Calculate a modulo */
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fn_mf = facch ? (fn % 26) : (fn % 13);
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#define MAP_GET_POS(map) \
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(start ? 0 : ARRAY_SIZE(map[i]) - 1)
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#define BLOCK_MAP_FN(map) \
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do { \
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if (map[i][MAP_GET_POS(map)] == fn_mf) \
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return true; \
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} while (++i < ARRAY_SIZE(map))
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/* Choose a proper block map */
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if (facch) {
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if (ul) {
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if (chan == TRXC_TCHH_0)
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BLOCK_MAP_FN(tch_h0_ul_facch_block_map);
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else
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BLOCK_MAP_FN(tch_h1_ul_facch_block_map);
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} else {
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if (chan == TRXC_TCHH_0)
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BLOCK_MAP_FN(tch_h0_dl_facch_block_map);
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else
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BLOCK_MAP_FN(tch_h1_dl_facch_block_map);
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}
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} else {
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if (chan == TRXC_TCHH_0)
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BLOCK_MAP_FN(tch_h0_traffic_block_map);
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else
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BLOCK_MAP_FN(tch_h1_traffic_block_map);
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}
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return false;
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}
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/**
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* Calculates a frame number of the first burst
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* using given frame number of the last burst.
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*
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* See GSM 05.02, clause 7, table 1
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*
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* @param chan channel type (TRXC_TCHH_0 or TRXC_TCHH_1)
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* @param last_fn frame number of the last burst
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* @param facch FACCH/H or traffic?
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* @return either frame number of the first burst,
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* or fn=last_fn if calculation failed
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*/
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uint32_t sched_tchh_block_dl_first_fn(enum trx_lchan_type chan,
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uint32_t last_fn, bool facch)
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{
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uint8_t fn_mf, fn_diff;
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int i = 0;
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/* Just to be sure */
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OSMO_ASSERT(chan == TRXC_TCHH_0 || chan == TRXC_TCHH_1);
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/* Calculate a modulo */
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fn_mf = facch ? (last_fn % 26) : (last_fn % 13);
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#define BLOCK_FIRST_FN(map) \
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do { \
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if (map[i][ARRAY_SIZE(map[i]) - 1] == fn_mf) { \
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fn_diff = TDMA_FN_DIFF(fn_mf, map[i][0]); \
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return TDMA_FN_SUB(last_fn, fn_diff); \
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} \
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} while (++i < ARRAY_SIZE(map))
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/* Choose a proper block map */
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if (facch) {
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if (chan == TRXC_TCHH_0)
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BLOCK_FIRST_FN(tch_h0_dl_facch_block_map);
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else
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BLOCK_FIRST_FN(tch_h1_dl_facch_block_map);
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} else {
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if (chan == TRXC_TCHH_0)
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BLOCK_FIRST_FN(tch_h0_traffic_block_map);
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else
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BLOCK_FIRST_FN(tch_h1_traffic_block_map);
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}
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LOGP(DSCHD, LOGL_ERROR, "Failed to calculate TDMA "
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"frame number of the first burst of %s block, "
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"using the current fn=%u\n", facch ?
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"FACCH/H" : "TCH/H", last_fn);
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/* Couldn't calculate the first fn, return the last */
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return last_fn;
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}
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2018-08-12 21:48:14 +00:00
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int rx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
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struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
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2020-03-01 19:55:01 +00:00
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sbit_t *bits, const struct trx_meas_set *meas)
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2018-08-12 21:48:14 +00:00
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{
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const struct trx_lchan_desc *lchan_desc;
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int n_errors = -1, n_bits_total, rc;
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sbit_t *buffer, *offset;
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uint8_t l2[128], *mask;
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size_t l2_len;
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/* Set up pointers */
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lchan_desc = &trx_lchan_desc[lchan->type];
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mask = &lchan->rx_burst_mask;
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buffer = lchan->rx_bursts;
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LOGP(DSCHD, LOGL_DEBUG, "Traffic received on %s: fn=%u ts=%u bid=%u\n",
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lchan_desc->name, fn, ts->index, bid);
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if (*mask == 0x00) {
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/* Align to the first burst */
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if (bid > 0)
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return 0;
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/* Align reception of the first FACCH/H frame */
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if (lchan->tch_mode == GSM48_CMODE_SIGN) {
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if (!sched_tchh_facch_start(lchan->type, fn, 0))
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return 0;
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} else { /* or TCH/H traffic frame */
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if (!sched_tchh_traffic_start(lchan->type, fn, 0))
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return 0;
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}
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}
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/* Update mask */
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*mask |= (1 << bid);
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2020-03-01 19:55:01 +00:00
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/* Store the measurements */
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sched_trx_meas_push(lchan, meas);
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2018-08-12 21:48:14 +00:00
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/* Copy burst to the end of buffer of 6 bursts */
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offset = buffer + bid * 116 + 464;
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memcpy(offset, bits + 3, 58);
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memcpy(offset + 58, bits + 87, 58);
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/* Wait until the second burst */
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if (bid != 1)
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return 0;
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/* Wait for complete set of bursts */
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if (lchan->tch_mode == GSM48_CMODE_SIGN) {
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/* FACCH/H is interleaved over 6 bursts */
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if ((*mask & 0x3f) != 0x3f)
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goto bfi_shift;
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} else {
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/* Traffic is interleaved over 4 bursts */
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if ((*mask & 0x0f) != 0x0f)
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goto bfi_shift;
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}
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/* Skip decoding attempt in case of FACCH/H */
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if (lchan->dl_ongoing_facch) {
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lchan->dl_ongoing_facch = false;
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goto bfi_shift; /* 2/2 BFI */
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}
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SIGN:
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case GSM48_CMODE_SPEECH_V1: /* HR */
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rc = gsm0503_tch_hr_decode(l2, buffer,
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!sched_tchh_facch_end(lchan->type, fn, 0),
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&n_errors, &n_bits_total);
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break;
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case GSM48_CMODE_SPEECH_AMR: /* AMR */
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/**
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* TODO: AMR requires a dedicated loop,
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* which will be implemented later...
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*/
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LOGP(DSCHD, LOGL_ERROR, "AMR isn't supported yet\n");
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return -ENOTSUP;
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default:
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LOGP(DSCHD, LOGL_ERROR, "Invalid TCH mode: %u\n", lchan->tch_mode);
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return -EINVAL;
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}
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/* Shift buffer by 4 bursts for interleaving */
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memcpy(buffer, buffer + 232, 232);
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memcpy(buffer + 232, buffer + 464, 232);
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/* Shift burst mask */
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*mask = *mask << 2;
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/* Check decoding result */
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if (rc < 4) {
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2020-03-01 19:55:01 +00:00
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/* Calculate AVG of the measurements (assuming 4 bursts) */
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sched_trx_meas_avg(lchan, 4);
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2020-03-02 12:07:35 +00:00
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LOGP(DSCHD, LOGL_ERROR, "Received bad TCH frame (%s) "
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"at fn=%u on %s (rc=%d)\n", burst_mask2str(mask, 6),
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lchan->meas_avg.fn, lchan_desc->name, rc);
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2018-08-12 21:48:14 +00:00
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/* Send BFI */
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goto bfi;
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} else if (rc == GSM_MACBLOCK_LEN) {
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/* Skip decoding of the next 2 stolen bursts */
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lchan->dl_ongoing_facch = true;
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2020-03-01 19:55:01 +00:00
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/* Calculate AVG of the measurements (FACCH/H takes 6 bursts) */
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sched_trx_meas_avg(lchan, 6);
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2018-08-12 21:48:14 +00:00
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/* FACCH/H received, forward to the higher layers */
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sched_send_dt_ind(trx, ts, lchan, l2, GSM_MACBLOCK_LEN,
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n_errors, false, false);
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2020-03-01 20:29:47 +00:00
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/* Send BFI substituting 1/2 stolen TCH frames */
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n_errors = -1; /* ensure fake measurements */
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2018-08-12 21:48:14 +00:00
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goto bfi;
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} else {
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/* A good TCH frame received */
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l2_len = rc;
|
2020-03-01 19:55:01 +00:00
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/* Calculate AVG of the measurements (traffic takes 4 bursts) */
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sched_trx_meas_avg(lchan, 4);
|
2018-08-12 21:48:14 +00:00
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}
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/* Send a traffic frame to the higher layers */
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return sched_send_dt_ind(trx, ts, lchan, l2, l2_len,
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n_errors, false, true);
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|
bfi_shift:
|
|
|
|
/* Shift buffer */
|
|
|
|
memcpy(buffer, buffer + 232, 232);
|
|
|
|
memcpy(buffer + 232, buffer + 464, 232);
|
|
|
|
|
|
|
|
/* Shift burst mask */
|
|
|
|
*mask = *mask << 2;
|
|
|
|
|
|
|
|
bfi:
|
2020-03-01 19:55:01 +00:00
|
|
|
/* Didn't try to decode, fake measurements */
|
|
|
|
if (n_errors < 0) {
|
|
|
|
lchan->meas_avg = (struct trx_meas_set) {
|
2020-03-02 12:07:35 +00:00
|
|
|
.fn = sched_tchh_block_dl_first_fn(lchan->type, fn, false),
|
2020-03-01 19:55:01 +00:00
|
|
|
.toa256 = 0,
|
|
|
|
.rssi = -110,
|
|
|
|
};
|
2020-03-04 22:01:18 +00:00
|
|
|
|
|
|
|
/* No bursts => no errors */
|
|
|
|
n_errors = 0;
|
2020-03-01 19:55:01 +00:00
|
|
|
}
|
2018-08-12 21:48:14 +00:00
|
|
|
|
|
|
|
/* BFI is not applicable in signalling mode */
|
|
|
|
if (lchan->tch_mode == GSM48_CMODE_SIGN)
|
|
|
|
return sched_send_dt_ind(trx, ts, lchan, NULL, 0,
|
|
|
|
n_errors, true, false);
|
|
|
|
|
|
|
|
/* Bad frame indication */
|
|
|
|
l2_len = sched_bad_frame_ind(l2, lchan);
|
|
|
|
|
|
|
|
/* Send a BFI frame to the higher layers */
|
|
|
|
return sched_send_dt_ind(trx, ts, lchan, l2, l2_len,
|
|
|
|
n_errors, true, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
int tx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
|
|
|
|
struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid)
|
|
|
|
{
|
|
|
|
const struct trx_lchan_desc *lchan_desc;
|
|
|
|
ubit_t burst[GSM_BURST_LEN];
|
|
|
|
ubit_t *buffer, *offset;
|
|
|
|
const uint8_t *tsc;
|
|
|
|
uint8_t *mask;
|
|
|
|
size_t l2_len;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* Set up pointers */
|
|
|
|
lchan_desc = &trx_lchan_desc[lchan->type];
|
|
|
|
mask = &lchan->tx_burst_mask;
|
|
|
|
buffer = lchan->tx_bursts;
|
|
|
|
|
|
|
|
if (bid > 0) {
|
|
|
|
/* Align to the first burst */
|
|
|
|
if (*mask == 0x00)
|
|
|
|
return 0;
|
|
|
|
goto send_burst;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*mask == 0x00) {
|
|
|
|
/* Align transmission of the first FACCH/H frame */
|
|
|
|
if (lchan->tch_mode == GSM48_CMODE_SIGN)
|
|
|
|
if (!sched_tchh_facch_start(lchan->type, fn, 1))
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Shift buffer by 2 bursts back for interleaving */
|
|
|
|
memcpy(buffer, buffer + 232, 232);
|
|
|
|
|
|
|
|
/* Also shift TX burst mask */
|
|
|
|
*mask = *mask << 2;
|
|
|
|
|
|
|
|
/* If FACCH/H blocks are still pending */
|
|
|
|
if (lchan->ul_facch_blocks > 2) {
|
|
|
|
memcpy(buffer + 232, buffer + 464, 232);
|
|
|
|
goto send_burst;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check the current TCH mode */
|
|
|
|
switch (lchan->tch_mode) {
|
|
|
|
case GSM48_CMODE_SIGN:
|
|
|
|
case GSM48_CMODE_SPEECH_V1: /* HR */
|
|
|
|
l2_len = GSM_HR_BYTES + 1;
|
|
|
|
break;
|
|
|
|
case GSM48_CMODE_SPEECH_AMR: /* AMR */
|
|
|
|
/**
|
|
|
|
* TODO: AMR requires a dedicated loop,
|
|
|
|
* which will be implemented later...
|
|
|
|
*/
|
|
|
|
LOGP(DSCHD, LOGL_ERROR, "AMR isn't supported yet, "
|
|
|
|
"dropping frame...\n");
|
|
|
|
|
|
|
|
/* Forget this primitive */
|
|
|
|
sched_prim_drop(lchan);
|
|
|
|
return -ENOTSUP;
|
|
|
|
default:
|
|
|
|
LOGP(DSCHD, LOGL_ERROR, "Invalid TCH mode: %u, "
|
|
|
|
"dropping frame...\n", lchan->tch_mode);
|
|
|
|
|
|
|
|
/* Forget this primitive */
|
|
|
|
sched_prim_drop(lchan);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Determine payload length */
|
|
|
|
if (PRIM_IS_FACCH(lchan->prim)) {
|
|
|
|
l2_len = GSM_MACBLOCK_LEN; /* FACCH */
|
|
|
|
} else if (lchan->prim->payload_len != l2_len) {
|
|
|
|
LOGP(DSCHD, LOGL_ERROR, "Primitive has odd length %zu "
|
|
|
|
"(expected %zu for TCH or %u for FACCH), so dropping...\n",
|
|
|
|
lchan->prim->payload_len, l2_len, GSM_MACBLOCK_LEN);
|
|
|
|
|
|
|
|
/* Forget this primitive */
|
|
|
|
sched_prim_drop(lchan);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Encode the payload */
|
|
|
|
rc = gsm0503_tch_hr_encode(buffer, lchan->prim->payload, l2_len);
|
|
|
|
if (rc) {
|
2019-06-30 09:04:22 +00:00
|
|
|
LOGP(DSCHD, LOGL_ERROR, "Failed to encode L2 payload (len=%zu): %s\n",
|
|
|
|
lchan->prim->payload_len, osmo_hexdump(lchan->prim->payload,
|
|
|
|
lchan->prim->payload_len));
|
2018-08-12 21:48:14 +00:00
|
|
|
|
|
|
|
/* Forget this primitive */
|
|
|
|
sched_prim_drop(lchan);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* A FACCH/H frame occupies 6 bursts */
|
|
|
|
if (PRIM_IS_FACCH(lchan->prim))
|
|
|
|
lchan->ul_facch_blocks = 6;
|
|
|
|
|
|
|
|
send_burst:
|
|
|
|
/* Determine which burst should be sent */
|
|
|
|
offset = buffer + bid * 116;
|
|
|
|
|
|
|
|
/* Update mask */
|
|
|
|
*mask |= (1 << bid);
|
|
|
|
|
|
|
|
/* Choose proper TSC */
|
|
|
|
tsc = sched_nb_training_bits[trx->tsc];
|
|
|
|
|
|
|
|
/* Compose a new burst */
|
|
|
|
memset(burst, 0, 3); /* TB */
|
|
|
|
memcpy(burst + 3, offset, 58); /* Payload 1/2 */
|
|
|
|
memcpy(burst + 61, tsc, 26); /* TSC */
|
|
|
|
memcpy(burst + 87, offset + 58, 58); /* Payload 2/2 */
|
|
|
|
memset(burst + 145, 0, 3); /* TB */
|
|
|
|
|
|
|
|
LOGP(DSCHD, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u burst=%u\n",
|
|
|
|
lchan_desc->name, fn, ts->index, bid);
|
|
|
|
|
|
|
|
/* Forward burst to transceiver */
|
|
|
|
sched_trx_handle_tx_burst(trx, ts, lchan, fn, burst);
|
|
|
|
|
|
|
|
/* In case of a FACCH/H frame, one block less */
|
|
|
|
if (lchan->ul_facch_blocks)
|
|
|
|
lchan->ul_facch_blocks--;
|
|
|
|
|
|
|
|
if ((*mask & 0x0f) == 0x0f) {
|
|
|
|
/**
|
|
|
|
* If no more FACCH/H blocks pending,
|
|
|
|
* confirm data / traffic sending
|
|
|
|
*/
|
|
|
|
if (!lchan->ul_facch_blocks)
|
|
|
|
sched_send_dt_conf(trx, ts, lchan, fn,
|
|
|
|
PRIM_IS_TCH(lchan->prim));
|
|
|
|
|
|
|
|
/* Forget processed primitive */
|
|
|
|
sched_prim_drop(lchan);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|