Commit c73cada3 authored by knopp's avatar knopp

added phich_common.c

parent e4c44dd0
/*
* 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
*/
/*! \file PHY/LTE_TRANSPORT/phich_common.c
* \brief Top-level routines for generating and decoding the PHICH/HI physical/transport channel V8.6 2009-03
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs_eNB.h"
uint8_t get_mi(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
{
// for FDD
if (frame_parms->frame_type == FDD)
return 1;
// for TDD
switch (frame_parms->tdd_config) {
case 0:
if ((subframe==0) || (subframe==5))
return(2);
else return(1);
break;
case 1:
if ((subframe==0) || (subframe==5))
return(0);
else return(1);
break;
case 2:
if ((subframe==3) || (subframe==8))
return(1);
else return(0);
break;
case 3:
if ((subframe==0) || (subframe==8) || (subframe==9))
return(1);
else return(0);
break;
case 4:
if ((subframe==8) || (subframe==9))
return(1);
else return(0);
break;
case 5:
if (subframe==8)
return(1);
else return(0);
break;
case 6:
return(1);
break;
default:
return(0);
}
}
unsigned char subframe2_ul_harq(LTE_DL_FRAME_PARMS *frame_parms,unsigned char subframe)
{
if (frame_parms->frame_type == FDD)
return(subframe&7);
switch (frame_parms->tdd_config) {
case 3:
if ( (subframe == 8) || (subframe == 9) ) {
return(subframe-8);
} else if (subframe==0)
return(2);
else {
LOG_E(PHY,"phich.c: subframe2_ul_harq, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
return(0);
}
break;
case 4:
if ( (subframe == 8) || (subframe == 9) ) {
return(subframe-8);
} else {
LOG_E(PHY,"phich.c: subframe2_ul_harq, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
return(0);
}
break;
}
return(0);
}
int phich_frame2_pusch_frame(LTE_DL_FRAME_PARMS *frame_parms, int frame, int subframe)
{
int pusch_frame;
if (frame_parms->frame_type == FDD) {
pusch_frame = subframe<4 ? frame + 1024 - 1 : frame;
} else {
// Note this is not true, but it doesn't matter, the frame number is irrelevant for TDD!
pusch_frame = (frame);
}
//LOG_D(PHY, "frame %d subframe %d: PUSCH frame = %d\n", frame, subframe, pusch_frame);
return pusch_frame % 1024;
}
uint8_t phich_subframe2_pusch_subframe(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
{
uint8_t pusch_subframe = 255;
if (frame_parms->frame_type == FDD)
return subframe < 4 ? subframe + 6 : subframe - 4;
switch (frame_parms->tdd_config) {
case 0:
if (subframe == 0)
pusch_subframe = (3);
else if (subframe == 5) {
pusch_subframe = (8);
} else if (subframe == 6)
pusch_subframe = (2);
else if (subframe == 1)
pusch_subframe = (7);
else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 1:
if (subframe == 6)
pusch_subframe = (2);
else if (subframe == 9)
pusch_subframe = (3);
else if (subframe == 1)
pusch_subframe = (7);
else if (subframe == 4)
pusch_subframe = (8);
else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 2:
if (subframe == 8)
pusch_subframe = (2);
else if (subframe == 3)
pusch_subframe = (7);
else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 3:
if ( (subframe == 8) || (subframe == 9) ) {
pusch_subframe = (subframe-6);
} else if (subframe==0)
pusch_subframe = (4);
else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 4:
if ( (subframe == 8) || (subframe == 9) ) {
pusch_subframe = (subframe-6);
} else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 5:
if (subframe == 8) {
pusch_subframe = (2);
} else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
case 6:
if (subframe == 6) {
pusch_subframe = (2);
} else if (subframe == 9) {
pusch_subframe = (3);
} else if (subframe == 0) {
pusch_subframe = (4);
} else if (subframe == 1) {
pusch_subframe = (7);
} else if (subframe == 5) {
pusch_subframe = (8);
} else {
AssertFatal(1==0,"phich.c: phich_subframe2_pusch_subframe, illegal subframe %d for tdd_config %d\n",
subframe,frame_parms->tdd_config);
pusch_subframe = (0);
}
break;
default:
AssertFatal(1==0, "no implementation for TDD UL/DL-config = %d!\n", frame_parms->tdd_config);
pusch_subframe = (0);
}
LOG_D(PHY, "subframe %d: PUSCH subframe = %d\n", subframe, pusch_subframe);
return pusch_subframe;
}
int check_pcfich(LTE_DL_FRAME_PARMS *frame_parms,uint16_t reg)
{
if ((reg == frame_parms->pcfich_reg[0]) ||
(reg == frame_parms->pcfich_reg[1]) ||
(reg == frame_parms->pcfich_reg[2]) ||
(reg == frame_parms->pcfich_reg[3]))
return(1);
return(0);
}
void generate_phich_reg_mapping(LTE_DL_FRAME_PARMS *frame_parms)
{
unsigned short n0 = (frame_parms->N_RB_DL * 2) - 4; // 2 REG per RB less the 4 used by PCFICH in first symbol
unsigned short n1 = (frame_parms->N_RB_DL * 3); // 3 REG per RB in second and third symbol
unsigned short n2 = n1;
unsigned short mprime = 0;
unsigned short Ngroup_PHICH;
// uint16_t *phich_reg = frame_parms->phich_reg;
uint16_t *pcfich_reg = frame_parms->pcfich_reg;
// compute Ngroup_PHICH (see formula at beginning of Section 6.9 in 36-211
Ngroup_PHICH = (frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)/48;
if (((frame_parms->phich_config_common.phich_resource*frame_parms->N_RB_DL)%48) > 0)
Ngroup_PHICH++;
// check if Extended prefix
if (frame_parms->Ncp == 1) {
Ngroup_PHICH<<=1;
}
#ifdef DEBUG_PHICH
LOG_D(PHY,"Ngroup_PHICH %d (phich_config_common.phich_resource %d,phich_config_common.phich_duration %s, NidCell %d,Ncp %d, frame_type %d), smallest pcfich REG %d, n0 %d, n1 %d (first PHICH REG %d)\n",
((frame_parms->Ncp == NORMAL)?Ngroup_PHICH:(Ngroup_PHICH>>1)),
frame_parms->phich_config_common.phich_resource,
frame_parms->phich_config_common.phich_duration==normal?"normal":"extended",
frame_parms->Nid_cell,frame_parms->Ncp,frame_parms->frame_type,
pcfich_reg[frame_parms->pcfich_first_reg_idx],
n0,
n1,
((frame_parms->Nid_cell))%n0);
#endif
// This is the algorithm from Section 6.9.3 in 36-211, it works only for normal PHICH duration for now ...
for (mprime=0;
mprime<((frame_parms->Ncp == NORMAL)?Ngroup_PHICH:(Ngroup_PHICH>>1));
mprime++) {
if (frame_parms->phich_config_common.phich_duration==normal) { // normal PHICH duration
frame_parms->phich_reg[mprime][0] = (frame_parms->Nid_cell + mprime)%n0;
if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
frame_parms->phich_reg[mprime][0]++;
if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
frame_parms->phich_reg[mprime][0]++;
if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
frame_parms->phich_reg[mprime][0]++;
if (frame_parms->phich_reg[mprime][0]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
frame_parms->phich_reg[mprime][0]++;
frame_parms->phich_reg[mprime][1] = (frame_parms->Nid_cell + mprime + (n0/3))%n0;
if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
frame_parms->phich_reg[mprime][1]++;
if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
frame_parms->phich_reg[mprime][1]++;
if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
frame_parms->phich_reg[mprime][1]++;
if (frame_parms->phich_reg[mprime][1]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
frame_parms->phich_reg[mprime][1]++;
frame_parms->phich_reg[mprime][2] = (frame_parms->Nid_cell + mprime + (2*n0/3))%n0;
if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[frame_parms->pcfich_first_reg_idx])
frame_parms->phich_reg[mprime][2]++;
if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+1)&3])
frame_parms->phich_reg[mprime][2]++;
if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+2)&3])
frame_parms->phich_reg[mprime][2]++;
if (frame_parms->phich_reg[mprime][2]>=pcfich_reg[(frame_parms->pcfich_first_reg_idx+3)&3])
frame_parms->phich_reg[mprime][2]++;
#ifdef DEBUG_PHICH
printf("phich_reg :%d => %d,%d,%d\n",mprime,frame_parms->phich_reg[mprime][0],frame_parms->phich_reg[mprime][1],frame_parms->phich_reg[mprime][2]);
#endif
} else { // extended PHICH duration
frame_parms->phich_reg[mprime<<1][0] = (frame_parms->Nid_cell + mprime)%n0;
frame_parms->phich_reg[1+(mprime<<1)][0] = (frame_parms->Nid_cell + mprime)%n0;
frame_parms->phich_reg[mprime<<1][1] = ((frame_parms->Nid_cell*n1/n0) + mprime + (n1/3))%n1;
frame_parms->phich_reg[mprime<<1][2] = ((frame_parms->Nid_cell*n2/n0) + mprime + (2*n2/3))%n2;
frame_parms->phich_reg[1+(mprime<<1)][1] = ((frame_parms->Nid_cell*n1/n0) + mprime + (n1/3))%n1;
frame_parms->phich_reg[1+(mprime<<1)][2] = ((frame_parms->Nid_cell*n2/n0) + mprime + (2*n2/3))%n2;
//#ifdef DEBUG_PHICH
printf("phich_reg :%d => %d,%d,%d\n",mprime<<1,frame_parms->phich_reg[mprime<<1][0],frame_parms->phich_reg[mprime][1],frame_parms->phich_reg[mprime][2]);
printf("phich_reg :%d => %d,%d,%d\n",1+(mprime<<1),frame_parms->phich_reg[1+(mprime<<1)][0],frame_parms->phich_reg[1+(mprime<<1)][1],frame_parms->phich_reg[1+(mprime<<1)][2]);
//#endif
}
} // mprime loop
} // num_pdcch_symbols loop
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