166 lines
5.3 KiB
C
166 lines
5.3 KiB
C
/*
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* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Oliver Smith
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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 <osmocom/gsm/protocol/gsm_08_08.h>
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#include <osmocom/gsm/protocol/gsm_08_58.h>
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#include <osmocom/bsc/data_rate_pref.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/lchan.h>
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static int gsm0808_data_rate_transp_to_gsm0858(enum gsm0808_data_rate_transp rate)
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{
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switch (rate) {
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case GSM0808_DATA_RATE_TRANSP_32k0:
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return RSL_CMOD_CSD_T_32k0;
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case GSM0808_DATA_RATE_TRANSP_28k8:
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return RSL_CMOD_CSD_T_29k0;
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case GSM0808_DATA_RATE_TRANSP_14k4:
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return RSL_CMOD_CSD_T_14k4;
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case GSM0808_DATA_RATE_TRANSP_9k6:
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return RSL_CMOD_CSD_T_9k6;
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case GSM0808_DATA_RATE_TRANSP_4k8:
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return RSL_CMOD_CSD_T_4k8;
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case GSM0808_DATA_RATE_TRANSP_2k4:
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return RSL_CMOD_CSD_T_2k4;
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case GSM0808_DATA_RATE_TRANSP_1k2:
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return RSL_CMOD_CSD_T_1k2;
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case GSM0808_DATA_RATE_TRANSP_600:
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return RSL_CMOD_CSD_T_600;
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case GSM0808_DATA_RATE_TRANSP_1200_75:
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return RSL_CMOD_CSD_T_1200_75;
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default:
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LOGP(DMSC, LOGL_ERROR, "Unsupported transparent data rate 0x%x\n", rate);
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return -1;
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}
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}
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static int gsm0808_data_rate_transp_to_gsm0408(enum gsm0808_data_rate_transp rate)
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{
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switch (rate) {
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case GSM0808_DATA_RATE_TRANSP_14k4:
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return GSM48_CMODE_DATA_14k5;
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case GSM0808_DATA_RATE_TRANSP_9k6:
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return GSM48_CMODE_DATA_12k0;
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case GSM0808_DATA_RATE_TRANSP_4k8:
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return GSM48_CMODE_DATA_6k0;
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case GSM0808_DATA_RATE_TRANSP_2k4:
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case GSM0808_DATA_RATE_TRANSP_1k2:
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case GSM0808_DATA_RATE_TRANSP_600:
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case GSM0808_DATA_RATE_TRANSP_1200_75:
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return GSM48_CMODE_DATA_3k6;
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default:
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LOGP(DMSC, LOGL_ERROR, "Unsupported transparent data rate 0x%x\n", rate);
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return -1;
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}
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}
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static int gsm0808_data_rate_non_transp_to_gsm0408(enum gsm0808_data_rate_non_transp rate, bool full_rate)
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{
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switch (rate) {
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case GSM0808_DATA_RATE_NON_TRANSP_12000_6000:
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if (full_rate)
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return GSM48_CMODE_DATA_12k0;
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return GSM48_CMODE_DATA_6k0;
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case GSM0808_DATA_RATE_NON_TRANSP_14k5:
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return GSM48_CMODE_DATA_14k5;
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case GSM0808_DATA_RATE_NON_TRANSP_12k0:
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return GSM48_CMODE_DATA_12k0;
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case GSM0808_DATA_RATE_NON_TRANSP_6k0:
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return GSM48_CMODE_DATA_6k0;
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default:
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LOGP(DMSC, LOGL_ERROR, "Unsupported non-transparent data rate 0x%x\n", rate);
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return -1;
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}
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}
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static int gsm0808_data_rate_non_transp_to_gsm0858(enum gsm0808_data_rate_non_transp rate, bool full_rate)
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{
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switch (rate) {
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case GSM0808_DATA_RATE_NON_TRANSP_12000_6000:
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if (full_rate)
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return RSL_CMOD_CSD_NT_12k0;
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return RSL_CMOD_CSD_NT_6k0;
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case GSM0808_DATA_RATE_NON_TRANSP_14k5:
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return RSL_CMOD_CSD_NT_14k5;
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case GSM0808_DATA_RATE_NON_TRANSP_12k0:
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return RSL_CMOD_CSD_NT_12k0;
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case GSM0808_DATA_RATE_NON_TRANSP_6k0:
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return RSL_CMOD_CSD_NT_6k0;
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case GSM0808_DATA_RATE_NON_TRANSP_43k5:
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return RSL_CMOD_CSD_NT_43k5;
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case GSM0808_DATA_RATE_NON_TRANSP_29k0:
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return RSL_CMOD_CSD_NT_28k8;
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default:
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LOGP(DMSC, LOGL_ERROR, "Unsupported non-transparent data rate 0x%x\n", rate);
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return -1;
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}
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}
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static enum gsm48_chan_mode match_non_transp_data_rate(const struct gsm0808_channel_type *ct, bool full_rate)
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{
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/* FIXME: Handle ct->data_rate_allowed too if it is set. Find the best
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* match by comparing the preferred ct->data_rate + all allowed
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* ct->data_rate_allowed against what's most suitable for the BTS. */
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return gsm0808_data_rate_non_transp_to_gsm0858(ct->data_rate, full_rate);
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}
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/*! Match the GSM 08.08 channel type received from the MSC to suitable data for
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* the BTS, the GSM 04.08 channel mode, channel rate (FR/HR) and GSM 08.58
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* data rate.
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* \param[out] ch_mode_rate resulting channel rate, channel mode and data rate
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* \param[in] ct GSM 08.08 channel type received from MSC.
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* \param[in] full_rate true means FR is preferred, false means HR
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* \returns 0 on success, -1 in case no match was found */
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int match_data_rate_pref(struct channel_mode_and_rate *ch_mode_rate,
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const struct gsm0808_channel_type *ct,
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const bool full_rate)
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{
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int rc;
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*ch_mode_rate = (struct channel_mode_and_rate){};
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ch_mode_rate->chan_rate = full_rate ? CH_RATE_FULL : CH_RATE_HALF;
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ch_mode_rate->data_transparent = ct->data_transparent;
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if (ct->data_transparent) {
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rc = gsm0808_data_rate_transp_to_gsm0858(ct->data_rate);
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if (rc == -1)
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return -1;
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ch_mode_rate->data_rate.t = rc;
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rc = gsm0808_data_rate_transp_to_gsm0408(ct->data_rate);
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if (rc == -1)
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return -1;
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ch_mode_rate->chan_mode = rc;
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} else {
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rc = match_non_transp_data_rate(ct, full_rate);
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if (rc == -1)
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return -1;
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ch_mode_rate->data_rate.nt = rc;
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rc = gsm0808_data_rate_non_transp_to_gsm0408(ct->data_rate, full_rate);
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if (rc == -1)
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return -1;
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ch_mode_rate->chan_mode = rc;
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}
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return 0;
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}
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