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/*
* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Oliver Smith
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <osmocom/gsm/protocol/gsm_08_58.h>
#include <osmocom/bsc/data_rate_pref.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/lchan.h>
static int gsm0808_data_rate_transp_to_gsm0858(enum gsm0808_data_rate_transp rate)
{
switch (rate) {
case GSM0808_DATA_RATE_TRANSP_32k0:
return RSL_CMOD_CSD_T_32k0;
case GSM0808_DATA_RATE_TRANSP_28k8:
return RSL_CMOD_CSD_T_29k0;
case GSM0808_DATA_RATE_TRANSP_14k4:
return RSL_CMOD_CSD_T_14k4;
case GSM0808_DATA_RATE_TRANSP_9k6:
return RSL_CMOD_CSD_T_9k6;
case GSM0808_DATA_RATE_TRANSP_4k8:
return RSL_CMOD_CSD_T_4k8;
case GSM0808_DATA_RATE_TRANSP_2k4:
return RSL_CMOD_CSD_T_2k4;
case GSM0808_DATA_RATE_TRANSP_1k2:
return RSL_CMOD_CSD_T_1k2;
case GSM0808_DATA_RATE_TRANSP_600:
return RSL_CMOD_CSD_T_600;
case GSM0808_DATA_RATE_TRANSP_1200_75:
return RSL_CMOD_CSD_T_1200_75;
default:
LOGP(DMSC, LOGL_ERROR, "Unsupported transparent data rate 0x%x\n", rate);
return -1;
}
}
static int gsm0808_data_rate_transp_to_gsm0408(enum gsm0808_data_rate_transp rate)
{
switch (rate) {
case GSM0808_DATA_RATE_TRANSP_14k4:
return GSM48_CMODE_DATA_14k5;
case GSM0808_DATA_RATE_TRANSP_9k6:
return GSM48_CMODE_DATA_12k0;
case GSM0808_DATA_RATE_TRANSP_4k8:
return GSM48_CMODE_DATA_6k0;
case GSM0808_DATA_RATE_TRANSP_2k4:
case GSM0808_DATA_RATE_TRANSP_1k2:
case GSM0808_DATA_RATE_TRANSP_600:
case GSM0808_DATA_RATE_TRANSP_1200_75:
return GSM48_CMODE_DATA_3k6;
default:
LOGP(DMSC, LOGL_ERROR, "Unsupported transparent data rate 0x%x\n", rate);
return -1;
}
}
static int gsm0808_data_rate_non_transp_to_gsm0408(enum gsm0808_data_rate_non_transp rate, bool full_rate)
{
switch (rate) {
case GSM0808_DATA_RATE_NON_TRANSP_12000_6000:
if (full_rate)
return GSM48_CMODE_DATA_12k0;
return GSM48_CMODE_DATA_6k0;
case GSM0808_DATA_RATE_NON_TRANSP_14k5:
return GSM48_CMODE_DATA_14k5;
case GSM0808_DATA_RATE_NON_TRANSP_12k0:
return GSM48_CMODE_DATA_12k0;
case GSM0808_DATA_RATE_NON_TRANSP_6k0:
return GSM48_CMODE_DATA_6k0;
default:
LOGP(DMSC, LOGL_ERROR, "Unsupported non-transparent data rate 0x%x\n", rate);
return -1;
}
}
static int gsm0808_data_rate_non_transp_to_gsm0858(enum gsm0808_data_rate_non_transp rate, bool full_rate)
{
switch (rate) {
case GSM0808_DATA_RATE_NON_TRANSP_12000_6000:
if (full_rate)
return RSL_CMOD_CSD_NT_12k0;
return RSL_CMOD_CSD_NT_6k0;
case GSM0808_DATA_RATE_NON_TRANSP_14k5:
return RSL_CMOD_CSD_NT_14k5;
case GSM0808_DATA_RATE_NON_TRANSP_12k0:
return RSL_CMOD_CSD_NT_12k0;
case GSM0808_DATA_RATE_NON_TRANSP_6k0:
return RSL_CMOD_CSD_NT_6k0;
case GSM0808_DATA_RATE_NON_TRANSP_43k5:
return RSL_CMOD_CSD_NT_43k5;
case GSM0808_DATA_RATE_NON_TRANSP_29k0:
return RSL_CMOD_CSD_NT_28k8;
default:
LOGP(DMSC, LOGL_ERROR, "Unsupported non-transparent data rate 0x%x\n", rate);
return -1;
}
}
static enum gsm48_chan_mode match_non_transp_data_rate(const struct gsm0808_channel_type *ct, bool full_rate)
{
/* FIXME: Handle ct->data_rate_allowed too if it is set. Find the best
* match by comparing the preferred ct->data_rate + all allowed
* ct->data_rate_allowed against what's most suitable for the BTS. */
return gsm0808_data_rate_non_transp_to_gsm0858(ct->data_rate, full_rate);
}
/*! Match the GSM 08.08 channel type received from the MSC to suitable data for
* the BTS, the GSM 04.08 channel mode, channel rate (FR/HR) and GSM 08.58
* data rate.
* \param[out] ch_mode_rate resulting channel rate, channel mode and data rate
* \param[in] ct GSM 08.08 channel type received from MSC.
* \param[in] full_rate true means FR is preferred, false means HR
* \returns 0 on success, -1 in case no match was found */
int match_data_rate_pref(struct channel_mode_and_rate *ch_mode_rate,
const struct gsm0808_channel_type *ct,
const bool full_rate)
{
int rc;
*ch_mode_rate = (struct channel_mode_and_rate){};
ch_mode_rate->chan_rate = full_rate ? CH_RATE_FULL : CH_RATE_HALF;
ch_mode_rate->data_transparent = ct->data_transparent;
if (ct->data_transparent) {
rc = gsm0808_data_rate_transp_to_gsm0858(ct->data_rate);
if (rc == -1)
return -1;
ch_mode_rate->data_rate.t = rc;
rc = gsm0808_data_rate_transp_to_gsm0408(ct->data_rate);
if (rc == -1)
return -1;
ch_mode_rate->chan_mode = rc;
} else {
rc = match_non_transp_data_rate(ct, full_rate);
if (rc == -1)
return -1;
ch_mode_rate->data_rate.nt = rc;
rc = gsm0808_data_rate_non_transp_to_gsm0408(ct->data_rate, full_rate);
if (rc == -1)
return -1;
ch_mode_rate->chan_mode = rc;
}
return 0;
}
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