63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Auxiliary scheduler utilities.
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*
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* (C) 2017 by Harald Welte <laforge@gnumonks.org>
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* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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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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#pragma once
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#include <stdint.h>
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#include <errno.h>
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#include <stdbool.h>
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/*! determine whether an uplink AMR block is CMI according to 3GPP TS 45.009.
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* \param[in] fn_begin frame number of the beginning of the block.
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* \returns true in case of CMI; false otherwise. */
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static inline bool ul_amr_fn_is_cmi(uint32_t fn_begin)
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{
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switch (fn_begin % 26) {
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/*! See also: 3GPP TS 45.009, section 3.2.1.3 Transmitter/Receiver Synchronisation */
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/* valid for AHS subslot 0 and AFS: */
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case 0:
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case 8:
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case 17:
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/* valid for AHS subslot 1: */
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case 1:
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case 9:
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case 18:
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return true;
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break;
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/* Complementary values for sanity check */
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/* valid for AHS subslot 0 and AFS: */
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case 4:
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case 13:
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case 21:
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/* valid for AHS subslot 1: */
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case 5:
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case 14:
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case 22:
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return false;
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break;
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default:
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OSMO_ASSERT(false);
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return false;
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break;
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}
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}
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