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openairinterface5g/openair1/PHY/INIT/lte_parms.c
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include "phy_init.h"
#include "common/utils/LOG/log.h"
static const uint16_t dl_S_table_normal[10] = {3, 9, 10, 11, 12, 3, 9, 10, 11, 6};
static const uint16_t dl_S_table_extended[10] = {3, 8, 9, 10, 3, 8, 9, 5, 0, 0};
void set_S_config(LTE_DL_FRAME_PARMS *fp) {
int X = fp->srsX;
fp->ul_symbols_in_S_subframe=(1+X);
if ((fp->Ncp==EXTENDED) && (fp->tdd_config_S>7))
AssertFatal(1==0,"Illegal S subframe configuration for Extended Prefix mode\n");
fp->dl_symbols_in_S_subframe = (fp->Ncp==NORMAL)?dl_S_table_normal[fp->tdd_config_S] : dl_S_table_extended[fp->tdd_config_S];
}
int init_frame_parms(LTE_DL_FRAME_PARMS *frame_parms,
uint8_t osf) {
uint8_t log2_osf;
LOG_I(PHY,"Initializing frame parms for N_RB_DL %d, Ncp %d, osf %d\n",frame_parms->N_RB_DL,frame_parms->Ncp,osf);
if (frame_parms->Ncp==EXTENDED) {
frame_parms->nb_prefix_samples0=512;
frame_parms->nb_prefix_samples = 512;
frame_parms->symbols_per_tti = 12;
} else {
frame_parms->nb_prefix_samples0 = 160;
frame_parms->nb_prefix_samples = 144;
frame_parms->symbols_per_tti = 14;
}
switch(osf) {
case 1:
log2_osf = 0;
break;
case 2:
log2_osf = 1;
break;
case 4:
log2_osf = 2;
break;
case 8:
log2_osf = 3;
break;
case 16:
log2_osf = 4;
break;
default:
AssertFatal(1==0,"Illegal oversampling %d\n",osf);
}
switch (frame_parms->N_RB_DL) {
case 100:
AssertFatal(osf==1,"Illegal oversampling %d for N_RB_DL %d\n",osf,frame_parms->N_RB_DL);
if (frame_parms->threequarter_fs) {
frame_parms->ofdm_symbol_size = 1536;
frame_parms->samples_per_tti = 23040;
frame_parms->first_carrier_offset = 1536-600;
frame_parms->nb_prefix_samples=(frame_parms->nb_prefix_samples*3)>>2;
frame_parms->nb_prefix_samples0=(frame_parms->nb_prefix_samples0*3)>>2;
} else {
frame_parms->ofdm_symbol_size = 2048;
frame_parms->samples_per_tti = 30720;
frame_parms->first_carrier_offset = 2048-600;
}
frame_parms->N_RBGS = 4;
frame_parms->N_RBG = 25;
frame_parms->ofdm_symbol_size_khz_1dot25 = 2*2*6144*osf;
frame_parms->first_carrier_offset_khz_1dot25 = frame_parms->ofdm_symbol_size_khz_1dot25 - 1800*2*2;
frame_parms->nb_prefix_samples_khz_1dot25>>=(2-log2_osf);
frame_parms->nb_prefix_samples0_khz_1dot25>>=(2-log2_osf);
break;
case 75:
AssertFatal(osf==1,"Illegal oversampling %d for N_RB_DL %d\n",osf,frame_parms->N_RB_DL);
frame_parms->ofdm_symbol_size = 1536;
frame_parms->samples_per_tti = 23040;
frame_parms->first_carrier_offset = 1536-450;
frame_parms->nb_prefix_samples=(frame_parms->nb_prefix_samples*3)>>2;
frame_parms->nb_prefix_samples0=(frame_parms->nb_prefix_samples0*3)>>2;
frame_parms->N_RBGS = 4;
frame_parms->N_RBG = 25;
frame_parms->ofdm_symbol_size_khz_1dot25 = 2*6144*osf;
frame_parms->first_carrier_offset_khz_1dot25 = frame_parms->ofdm_symbol_size_khz_1dot25 - 1800*2;
frame_parms->nb_prefix_samples_khz_1dot25>>=(2-log2_osf);
frame_parms->nb_prefix_samples0_khz_1dot25>>=(2-log2_osf);
break;
case 50:
AssertFatal(osf==1,"Illegal oversampling %d for N_RB_DL %d\n",osf,frame_parms->N_RB_DL);
frame_parms->ofdm_symbol_size = 1024*osf;
frame_parms->samples_per_tti = 15360*osf;
frame_parms->first_carrier_offset = frame_parms->ofdm_symbol_size - 300;
frame_parms->nb_prefix_samples>>=(1-log2_osf);
frame_parms->nb_prefix_samples0>>=(1-log2_osf);
frame_parms->N_RBGS = 3;
frame_parms->N_RBG = 17;
frame_parms->ofdm_symbol_size_khz_1dot25 = 2*6144*osf;
frame_parms->first_carrier_offset_khz_1dot25 = frame_parms->ofdm_symbol_size_khz_1dot25 - 1800*2;
frame_parms->nb_prefix_samples_khz_1dot25>>=(2-log2_osf);
frame_parms->nb_prefix_samples0_khz_1dot25>>=(2-log2_osf);
break;
case 25:
AssertFatal(osf<=2,"Illegal oversampling %d for N_RB_DL %d\n",osf,frame_parms->N_RB_DL);
frame_parms->ofdm_symbol_size = 512*osf;
frame_parms->samples_per_tti = 7680*osf;
frame_parms->first_carrier_offset = frame_parms->ofdm_symbol_size - 150;
frame_parms->nb_prefix_samples>>=(2-log2_osf);
frame_parms->nb_prefix_samples0>>=(2-log2_osf);
frame_parms->N_RBGS = 2;
frame_parms->N_RBG = 13;
frame_parms->ofdm_symbol_size_khz_1dot25 = 6144*osf;
frame_parms->first_carrier_offset_khz_1dot25 = frame_parms->ofdm_symbol_size_khz_1dot25 - 1800; //4344
frame_parms->nb_prefix_samples_khz_1dot25>>=(2-log2_osf);
frame_parms->nb_prefix_samples0_khz_1dot25>>=(2-log2_osf);
break;
case 15:
frame_parms->ofdm_symbol_size = 256*osf;
frame_parms->samples_per_tti = 3840*osf;
frame_parms->first_carrier_offset = frame_parms->ofdm_symbol_size - 90;
AssertFatal(log2_osf < 4 ,"log2_osf %d will cause undefined behaviour \n", log2_osf);
frame_parms->nb_prefix_samples>>=(3-log2_osf);
frame_parms->nb_prefix_samples0>>=(3-log2_osf);
frame_parms->N_RBGS = 2;
frame_parms->N_RBG = 8;
break;
case 6:
frame_parms->ofdm_symbol_size = 128*osf;
frame_parms->samples_per_tti = 1920*osf;
frame_parms->first_carrier_offset = frame_parms->ofdm_symbol_size - 36;
frame_parms->nb_prefix_samples>>=(4-log2_osf);
frame_parms->nb_prefix_samples0>>=(4-log2_osf);
frame_parms->N_RBGS = 1;
frame_parms->N_RBG = 6;
break;
default:
AssertFatal(1==0,"Number of resource blocks (N_RB_DL %d) undefined, frame_parms = %p \n",frame_parms->N_RB_DL, frame_parms);
break;
}
LOG_I(PHY,"lte_parms.c: Setting N_RB_DL to %d, ofdm_symbol_size %d\n",frame_parms->N_RB_DL, frame_parms->ofdm_symbol_size);
if (frame_parms->frame_type == TDD) set_S_config(frame_parms);
frame_parms->samples_per_subframe=frame_parms->samples_per_tti;
frame_parms->samples_per_slot=frame_parms->samples_per_tti>>1;
// frame_parms->tdd_config=3;
return(0);
}
void dump_frame_parms(LTE_DL_FRAME_PARMS *frame_parms) {
LOG_I(PHY,"frame_parms->N_RB_DL=%d\n",frame_parms->N_RB_DL);
LOG_I(PHY,"frame_parms->N_RB_UL=%d\n",frame_parms->N_RB_UL);
LOG_I(PHY,"frame_parms->Nid_cell=%d\n",frame_parms->Nid_cell);
LOG_I(PHY,"frame_parms->Ncp=%d\n",frame_parms->Ncp);
LOG_I(PHY,"frame_parms->Ncp_UL=%d\n",frame_parms->Ncp_UL);
LOG_I(PHY,"frame_parms->nushift=%d\n",frame_parms->nushift);
LOG_I(PHY,"frame_parms->frame_type=%d\n",frame_parms->frame_type);
LOG_I(PHY,"frame_parms->tdd_config=%d\n",frame_parms->tdd_config);
LOG_I(PHY,"frame_parms->tdd_config_S=%d\n",frame_parms->tdd_config_S);
LOG_I(PHY,"frame_parms->nb_antenna_ports_eNB=%d\n",frame_parms->nb_antenna_ports_eNB);
LOG_I(PHY,"frame_parms->nb_antennas_tx=%d\n",frame_parms->nb_antennas_tx);
LOG_I(PHY,"frame_parms->nb_antennas_rx=%d\n",frame_parms->nb_antennas_rx);
LOG_I(PHY,"frame_parms->ofdm_symbol_size=%d\n",frame_parms->ofdm_symbol_size);
LOG_I(PHY,"frame_parms->nb_prefix_samples=%d\n",frame_parms->nb_prefix_samples);
LOG_I(PHY,"frame_parms->nb_prefix_samples0=%d\n",frame_parms->nb_prefix_samples0);
LOG_I(PHY,"frame_parms->first_carrier_offset=%d\n",frame_parms->first_carrier_offset);
LOG_I(PHY,"frame_parms->samples_per_tti=%d\n",frame_parms->samples_per_tti);
LOG_I(PHY,"frame_parms->symbols_per_tti=%d\n",frame_parms->symbols_per_tti);
}
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