153 lines
4.9 KiB
C
153 lines
4.9 KiB
C
|
/*
|
||
|
* (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)
|
||
|
{
|
||
|
LOGP(DMSC, LOGL_ERROR, "%s is not implemented\n", __func__); /* FIXME */
|
||
|
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);
|
||
|
if (rc == -1)
|
||
|
return -1;
|
||
|
ch_mode_rate->chan_mode = rc;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|