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/*******************************************************************************
Eurecom OpenAirInterface
Copyright(c) 1999 - 2011 Eurecom
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
version 2, as published by the Free Software Foundation.
This program is distributed in the hope it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
The full GNU General Public License is included in this distribution in
the file called "COPYING".
Contact Information
Openair Admin: openair_admin@eurecom.fr
Openair Tech : openair_tech@eurecom.fr
Forums : http://forums.eurecom.fsr/openairinterface
Address : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France
*******************************************************************************/
/*! \file PHY/LTE_TRANSPORT/lte_mcs.c
* \brief Some support routines for MCS computations
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "PHY/LTE_TRANSPORT/proto.h"
unsigned char get_Qm(unsigned char I_MCS) {
if (I_MCS < 10)
return(2);
else if (I_MCS < 17)
return(4);
else
return(6);
}
unsigned char get_Qm_ul(unsigned char I_MCS) {
if (I_MCS < 11)
return(2);
else if (I_MCS < 21)
return(4);
else
return(6);
}
unsigned char get_I_TBS(unsigned char I_MCS) {
if (I_MCS < 10)
return(I_MCS);
else if (I_MCS == 10)
return(9);
else if (I_MCS < 17)
return(I_MCS-1);
else if (I_MCS == 17)
return(15);
else return(I_MCS-2);
}
unsigned char get_I_TBS_UL(unsigned char I_MCS) {
if (I_MCS <= 10)
return(I_MCS);
else if (I_MCS == 10)
return(10);
else if (I_MCS < 21)
return(I_MCS-1);
else return(I_MCS-2);
}
unsigned char I_TBS2I_MCS(unsigned char I_TBS) {
unsigned char I_MCS = -1;
///note: change from <= to < to go from choosing higher modulation rather than high code-rate
if (I_TBS <= 9)
I_MCS = I_TBS;
else if (I_TBS <= 15)
I_MCS = I_TBS + 1;
else if (I_TBS > 15 && I_TBS <= 26)
I_MCS = I_TBS + 2;
#ifdef OUTPUT_DEBUG
printf("I_MCS: %d, from mod_order %d and I_TBS %d\n",I_MCS,modOrder(I_MCS,I_TBS),I_TBS);
if (I_MCS == 0xFF) getchar();
#endif
return I_MCS;
}
uint64_t get_TBS_DL(uint8_t mcs, uint16_t nb_rb) {
if ((nb_rb > 0) && (mcs < 29)) {
#ifdef TBS_FIX
TBS = 3*TBStable[get_I_TBS(mcs)][nb_rb-1]/4;
TBS = TBS>>3;
#else
TBS = TBStable[get_I_TBS(mcs)][nb_rb-1];
TBS = TBS>>3;
#endif
return(TBS);
}
else {
}
}
uint64_t get_TBS_UL(uint8_t mcs, uint16_t nb_rb) {
if ((nb_rb > 0) && (mcs < 29)) {
#ifdef TBS_FIX
TBS = 3*TBStable[get_I_TBS_UL(mcs)][nb_rb-1]/4;
TBS = TBS>>3;
#else
TBS = TBStable[get_I_TBS_UL(mcs)][nb_rb-1];
TBS = TBS>>3;
#endif
return(TBS);
}
else {
}
}
int adjust_G2(LTE_DL_FRAME_PARMS *frame_parms,uint32_t *rb_alloc,uint8_t mod_order,uint8_t subframe,uint8_t symbol) {
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int rb,re_pbch_sss=0;
int rb_alloc_ind,nsymb;
nsymb = (frame_parms->Ncp==0) ? 14 : 12;
// printf("adjust_G2 : symbol %d, subframe %d\n",symbol,subframe);
if ((subframe!=0) && (subframe!=5) && (subframe!=6)) // if not PBCH/SSS or SSS
return(0);
//first half of slot and TDD (no adjustments in first slot except for subframe 6 - PSS)
if ((symbol<(nsymb>>1))&&
(frame_parms->frame_type == TDD)&&
(subframe!=6))
return(0);
// after PBCH
if (frame_parms->frame_type==TDD) { //TDD
if ((symbol>((nsymb>>1)+3)) &&
(symbol!=(nsymb-1))) ///SSS
return(0);
if ((subframe==5) && (symbol!=(nsymb-1))) ///SSS
return(0);
if ((subframe==6) && (symbol!=2)) /// PSS
return(0);
}
else { // FDD
if ((symbol>((nsymb>>1)+3)) ||
(symbol<((nsymb>>1)-2)))
return(0);
if ((subframe==5) && (symbol!=((nsymb>>1)-1))&& (symbol!=((nsymb>>1)-2)))
return(0);
if (subframe==6)
return(0);
}
if ((frame_parms->N_RB_DL&1) == 1) { // ODD N_RB_DL
for (rb=((frame_parms->N_RB_DL>>1)-3);
rb<=((frame_parms->N_RB_DL>>1)+3);
rb++) {
if (rb < 32)
rb_alloc_ind = (rb_alloc[0]>>rb) & 1;
else if (rb < 64)
rb_alloc_ind = (rb_alloc[1]>>(rb-32)) & 1;
else if (rb < 96)
rb_alloc_ind = (rb_alloc[2]>>(rb-64)) & 1;
else if (rb < 100)
rb_alloc_ind = (rb_alloc[3]>>(rb-96)) & 1;
else
rb_alloc_ind = 0;
if (rb_alloc_ind==1) {
if ((rb==(frame_parms->N_RB_DL>>1)-3) ||
(rb==((frame_parms->N_RB_DL>>1)+3))) {
re_pbch_sss += 6;
}
else
re_pbch_sss += 12;
}
}
}
else {
for (rb=((frame_parms->N_RB_DL>>1)-3);
rb<((frame_parms->N_RB_DL>>1)+3);
rb++) {
if (rb < 32)
rb_alloc_ind = (rb_alloc[0]>>rb) & 1;
else if (rb < 64)
rb_alloc_ind = (rb_alloc[1]>>(rb-32)) & 1;
else if (rb < 96)
rb_alloc_ind = (rb_alloc[2]>>(rb-64)) & 1;
else if (rb < 100)
rb_alloc_ind = (rb_alloc[3]>>(rb-96)) & 1;
else
rb_alloc_ind = 0;
if (rb_alloc_ind==1) {
re_pbch_sss += 12;
}
}
}
// printf("re_pbch_sss %d\n",re_pbch_sss);
return(re_pbch_sss);
}
int adjust_G(LTE_DL_FRAME_PARMS *frame_parms,uint32_t *rb_alloc,uint8_t mod_order,uint8_t subframe) {
int rb,re_pbch_sss=0;
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if ((subframe!=0) && (subframe!=5) && (subframe!=6)) // if not PBCH/SSS/PSS or SSS/PSS
return(0);
if ((frame_parms->N_RB_DL&1) == 1) { // ODD N_RB_DL
for (rb=((frame_parms->N_RB_DL>>1)-3);
rb<=((frame_parms->N_RB_DL>>1)+3);
rb++) {
if (rb < 32)
rb_alloc_ind = (rb_alloc[0]>>rb) & 1;
else if (rb < 64)
rb_alloc_ind = (rb_alloc[1]>>(rb-32)) & 1;
else if (rb < 96)
rb_alloc_ind = (rb_alloc[2]>>(rb-64)) & 1;
else if (rb < 100)
rb_alloc_ind = (rb_alloc[3]>>(rb-96)) & 1;
else
rb_alloc_ind = 0;
if (rb_alloc_ind==1) {
if ((rb==(frame_parms->N_RB_DL>>1)-3) ||
(rb==((frame_parms->N_RB_DL>>1)+3))) { //rb taken by PBCH/SSS
re_pbch_sss += 6;
}
else
re_pbch_sss += 12;
}
}
}
else {
for (rb=((frame_parms->N_RB_DL>>1)-3);
rb<((frame_parms->N_RB_DL>>1)+3);
rb++) {
if (rb < 32)
rb_alloc_ind = (rb_alloc[0]>>rb) & 1;
else if (rb < 64)
rb_alloc_ind = (rb_alloc[1]>>(rb-32)) & 1;
else if (rb < 96)
rb_alloc_ind = (rb_alloc[2]>>(rb-64)) & 1;
else if (rb < 100)
rb_alloc_ind = (rb_alloc[3]>>(rb-96)) & 1;
else
rb_alloc_ind = 0;
if (rb_alloc_ind==1) {
re_pbch_sss += 12;
}
}
}
// printf("re_pbch_sss %d\n",re_pbch_sss);
if (subframe==0) { //PBCH+SSS+PSS
if (frame_parms->frame_type == 1) { // TDD
if (frame_parms->mode1_flag==0)
//2ant so PBCH 3+2/3 symbols, SSS 1 symbol * REs => (14/3)*re_pbch_sss for normal CP,
// 2+4/3 symbols, SSS 1 symbol => (13/3)*re_pbch_sss for ext. CP
return((-frame_parms->Ncp+14)*re_pbch_sss * mod_order/3);
else
//SISO so PBCH 3+(5/6) symbols, SSS 1 symbol * REs => (29/6)*re_pbch_sss for normal CP,
// 2+10/6 symbols, SSS 1 symbol => (28/6)*re_pbch_sss for ext. CP
return((-frame_parms->Ncp+29)*re_pbch_sss * mod_order/6);
}
else { // FDD
if (frame_parms->mode1_flag==0)
//2ant so PBCH 3+2/3 symbols, PSS+SSS 2 symbols * REs => (17/3)*re_pbch_sss for normal CP,
// 2+4/3 symbols, PSS+SSS 2 symbols => (16/3)*re_pbch_sss for ext. CP
return((-frame_parms->Ncp+17)*re_pbch_sss * mod_order/3);
else
//SISO so PBCH 3+(5/6) symbols, PSS+SSS 2symbols REs => (35/6)*re_pbch_sss for normal CP,
// 2+10/6 symbols, SSS+PSS 2 symbols => (34/6)*re_pbch_sss for ext. CP
return((-frame_parms->Ncp+35)*re_pbch_sss * mod_order/6);
}
}
else if (subframe == 5) // SSS+PSS for FDD, SSS for TDD
return(((frame_parms->frame_type==0)?2:1)*re_pbch_sss * 1 * mod_order);
else if ((subframe == 6)&&(frame_parms->frame_type == 1)) // PSS for TDD
return(re_pbch_sss * 1 * mod_order);
return(0);
}
int get_G(LTE_DL_FRAME_PARMS *frame_parms,uint16_t nb_rb,uint32_t *rb_alloc,uint8_t mod_order,uint8_t num_pdcch_symbols,int frame,uint8_t subframe) {
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int G_adj;
if (is_pmch_subframe(frame,subframe,frame_parms) == 0) {
G_adj= adjust_G(frame_parms,rb_alloc,mod_order,subframe);
// printf("get_G subframe %d mod_order %d, nb_rb %d: rb_alloc %x,%x,%x,%x, G_adj %d\n",subframe,mod_order,nb_rb,rb_alloc[3],rb_alloc[2],rb_alloc[1],rb_alloc[0], G_adj);
if (frame_parms->Ncp==0) { // normal prefix
// PDDDPDD PDDDPDD - 13 PDSCH symbols, 10 full, 3 w/ pilots = 10*12 + 3*8
// PCDDPDD PDDDPDD - 12 PDSCH symbols, 9 full, 3 w/ pilots = 9*12 + 3*8
// PCCDPDD PDDDPDD - 11 PDSCH symbols, 8 full, 3 w/pilots = 8*12 + 3*8
if (frame_parms->mode1_flag==0) // SISO
return(((int)nb_rb * mod_order * ((11-num_pdcch_symbols)*12 + 3*8)) - G_adj);
else
return(((int)nb_rb * mod_order * ((11-num_pdcch_symbols)*12 + 3*10)) - G_adj);
}
else {
// PDDPDD PDDPDD - 11 PDSCH symbols, 8 full, 3 w/ pilots = 8*12 + 3*8
// PCDPDD PDDPDD - 10 PDSCH symbols, 7 full, 3 w/ pilots = 7*12 + 3*8
// PCCPDD PDDPDD - 9 PDSCH symbols, 6 full, 3 w/pilots = 6*12 + 3*8
if (frame_parms->mode1_flag==0)
return(((int)nb_rb * mod_order * ((9-num_pdcch_symbols)*12 + 3*8)) - G_adj);
else
return(((int)nb_rb * mod_order * ((9-num_pdcch_symbols)*12 + 3*10)) - G_adj);
}
}
else { // This is an MBSFN subframe
return((int)frame_parms->N_RB_DL * mod_order * 102);
}
}
// following function requires dlsch_tbs_full.h
#include "PHY/LTE_TRANSPORT/dlsch_tbs_full.h"
unsigned char SE2I_TBS(float SE,
unsigned char N_PRB,
unsigned char symbPerRB) {
unsigned char I_TBS= -1;
int throughPutGoal = 0;
short diffOld = abs(TBStable[0][N_PRB-1] - throughPutGoal);
short diffNew = diffOld;
int i = 0;
throughPutGoal = (int)(((SE*1024)*N_PRB*symbPerRB*12)/1024);
#ifdef OUTPUT_DEBUG
printf("Throughput goal = %d, from SE = %f\n",throughPutGoal,SE);
#endif
I_TBS = 0;
for (i = 0; i<TBStable_rowCnt; i++) {
diffNew = abs(TBStable[i][N_PRB-1] - throughPutGoal);
if (diffNew <= diffOld) {
diffOld = diffNew;
I_TBS = i;
} else {
#ifdef OUTPUT_DEBUG
printf("diff neglected: %d\n",diffNew);
#endif
break; // no need to continue, strictly increasing function...
}
#ifdef OUTPUT_DEBUG
printf("abs(%d - %d) = %d, --> I_TBS = %d\n",TBStable[i][N_PRB-1],throughPutGoal,diffNew,I_TBS);
#endif
}
return I_TBS;
}
//added for ALU icic purpose