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openairinterface5g/openair1/PHY/LTE_UE_TRANSPORT/phich_ue.c
T
Laurent THOMAS 206aa36a47 Make read-only globals const, additional fixes 
- Global variables that are never written to are marked const
- Remove some EXTERN declaration
- Remove unused `log_mem_multi` from logging module
2023-08-18 14:20:37 +02:00

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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
*/
/*! \file PHY/LTE_TRANSPORT/phich_ue.c
* \brief Top-level routines for 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_UE.h"
#include "PHY/phy_extern_ue.h"
#include "PHY/phy_extern.h"
#include "SCHED_UE/sched_UE.h"
#include "transport_ue.h"
#include "transport_proto_ue.h"
#include "PHY/LTE_REFSIG/lte_refsig.h"
#include "LAYER2/MAC/mac.h"
#include "T.h"
//#define DEBUG_PHICH 1
//extern unsigned short pcfich_reg[4];
//extern unsigned char pcfich_first_reg_idx;
//unsigned short phich_reg[MAX_NUM_PHICH_GROUPS][3];
uint8_t rv_table[4] = {0, 2, 3, 1};
// This routine demodulates the PHICH and updates PUSCH/ULSCH parameters
void rx_phich(PHY_VARS_UE *ue,
UE_rxtx_proc_t *proc,
uint8_t subframe,
uint8_t eNB_id)
{
LTE_DL_FRAME_PARMS *frame_parms=&ue->frame_parms;
LTE_UE_PDCCH **pdcch_vars = &ue->pdcch_vars[ue->current_thread_id[subframe]][eNB_id];
// uint8_t HI;
uint8_t harq_pid = phich_subframe_to_harq_pid(frame_parms,proc->frame_rx,subframe);
LTE_UE_ULSCH_t *ulsch = ue->ulsch[eNB_id];
int16_t phich_d[24],*phich_d_ptr,HI16;
// unsigned int i,aa;
int8_t d[24],*dp;
uint16_t reg_offset;
// scrambling
uint32_t x1, x2, s=0;
uint8_t reset = 1;
int16_t cs[12];
uint32_t i,i2,i3,phich_quad;
int32_t **rxdataF_comp = pdcch_vars[eNB_id]->rxdataF_comp;
uint8_t Ngroup_PHICH,ngroup_PHICH,nseq_PHICH;
uint8_t NSF_PHICH = 4;
uint8_t pusch_subframe;
// check if we're expecting a PHICH in this subframe
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH RX\n",ue->Mod_id,harq_pid,proc->frame_rx,subframe);
if (!ulsch)
return;
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH RX Status: %d \n",ue->Mod_id,harq_pid,proc->frame_rx,subframe, ulsch->harq_processes[harq_pid]->status);
if (ulsch->harq_processes[harq_pid]->status == ACTIVE) {
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH RX ACTIVE\n",ue->Mod_id,harq_pid,proc->frame_rx,subframe);
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++;
if (frame_parms->Ncp == 1)
NSF_PHICH = 2;
ngroup_PHICH = (ulsch->harq_processes[harq_pid]->first_rb +
ulsch->harq_processes[harq_pid]->n_DMRS)%Ngroup_PHICH;
if ((frame_parms->tdd_config == 0) && (frame_parms->frame_type == TDD) ) {
pusch_subframe = phich_subframe2_pusch_subframe(frame_parms,subframe);
if ((pusch_subframe == 4) || (pusch_subframe == 9))
ngroup_PHICH += Ngroup_PHICH;
}
nseq_PHICH = ((ulsch->harq_processes[harq_pid]->first_rb/Ngroup_PHICH) +
ulsch->harq_processes[harq_pid]->n_DMRS)%(2*NSF_PHICH);
} else {
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH RX %s\n",
ue->Mod_id,
harq_pid,
proc->frame_rx,
subframe,
(ulsch->harq_processes[harq_pid]->status==SCH_IDLE? "SCH_IDLE" :
(ulsch->harq_processes[harq_pid]->status==ACTIVE? "ACTIVE" :
(ulsch->harq_processes[harq_pid]->status==CBA_ACTIVE? "CBA_ACTIVE":
(ulsch->harq_processes[harq_pid]->status==DISABLED? "DISABLED" : "UNKNOWN")))));
return;
}
memset(d,0,24*sizeof(int8_t));
phich_d_ptr = phich_d;
// x1 is set in lte_gold_generic
x2 = (((subframe+1)*((frame_parms->Nid_cell<<1)+1))<<9) + frame_parms->Nid_cell;
s = lte_gold_generic(&x1, &x2, reset);
// compute scrambling sequence
for (i=0; i<12; i++) {
cs[i] = 1-(((s>>(i&0x1f))&1)<<1);
}
if (frame_parms->Ncp == 0) { // Normal Cyclic Prefix
// 12 output symbols (Msymb)
for (i=0,i2=0,i3=0; i<3; i++,i2+=4,i3+=8) {
switch (nseq_PHICH) {
case 0: // +1 +1 +1 +1
d[i3] = cs[i2];
d[1+i3] = cs[i2];
d[2+i3] = cs[1+i2];
d[3+i3] = cs[1+i2];
d[4+i3] = cs[2+i2];
d[5+i3] = cs[2+i2];
d[6+i3] = cs[3+i2];
d[7+i3] = cs[3+i2];
break;
case 1: // +1 -1 +1 -1
d[i3] = cs[i2];
d[1+i3] = cs[i2];
d[2+i3] = -cs[1+i2];
d[3+i3] = -cs[1+i2];
d[4+i3] = cs[2+i2];
d[5+i3] = cs[2+i2];
d[6+i3] = -cs[3+i2];
d[7+i3] = -cs[3+i2];
break;
case 2: // +1 +1 -1 -1
d[i3] = cs[i2];
d[1+i3] = cs[i2];
d[2+i3] = cs[1+i2];
d[3+i3] = cs[1+i2];
d[4+i3] = -cs[2+i2];
d[5+i3] = -cs[2+i2];
d[6+i3] = -cs[3+i2];
d[7+i3] = -cs[3+i2];
break;
case 3: // +1 -1 -1 +1
d[i3] = cs[i2];
d[1+i3] = cs[i2];
d[2+i3] = -cs[1+i2];
d[3+i3] = -cs[1+i2];
d[4+i3] = -cs[2+i2];
d[5+i3] = -cs[2+i2];
d[6+i3] = cs[3+i2];
d[7+i3] = cs[3+i2];
break;
case 4: // +j +j +j +j
d[i3] = -cs[i2];
d[1+i3] = cs[i2];
d[2+i3] = -cs[1+i2];
d[3+i3] = cs[1+i2];
d[4+i3] = -cs[2+i2];
d[5+i3] = cs[2+i2];
d[6+i3] = -cs[3+i2];
d[7+i3] = cs[3+i2];
break;
case 5: // +j -j +j -j
d[1+i3] = cs[i2];
d[3+i3] = -cs[1+i2];
d[5+i3] = cs[2+i2];
d[7+i3] = -cs[3+i2];
d[i3] = -cs[i2];
d[2+i3] = cs[1+i2];
d[4+i3] = -cs[2+i2];
d[6+i3] = cs[3+i2];
break;
case 6: // +j +j -j -j
d[1+i3] = cs[i2];
d[3+i3] = cs[1+i2];
d[5+i3] = -cs[2+i2];
d[7+i3] = -cs[3+i2];
d[i3] = -cs[i2];
d[2+i3] = -cs[1+i2];
d[4+i3] = cs[2+i2];
d[6+i3] = cs[3+i2];
break;
case 7: // +j -j -j +j
d[1+i3] = cs[i2];
d[3+i3] = -cs[1+i2];
d[5+i3] = -cs[2+i2];
d[7+i3] = cs[3+i2];
d[i3] = -cs[i2];
d[2+i3] = cs[1+i2];
d[4+i3] = cs[2+i2];
d[6+i3] = -cs[3+i2];
break;
default:
AssertFatal(1==0,"phich_coding.c: Illegal PHICH Number\n");
} // nseq_PHICH
}
#ifdef DEBUG_PHICH
LOG_D(PHY,"PHICH =>");
for (i=0; i<24; i++) {
LOG_D(PHY,"%2d,",d[i]);
}
LOG_D(PHY,"\n");
#endif
// demodulation here
} else { // extended prefix
// 6 output symbols
if ((ngroup_PHICH & 1) == 1)
dp = &d[4];
else
dp = d;
switch (nseq_PHICH) {
case 0: // +1 +1
dp[0] = cs[0];
dp[2] = cs[1];
dp[8] = cs[2];
dp[10] = cs[3];
dp[16] = cs[4];
dp[18] = cs[5];
dp[1] = cs[0];
dp[3] = cs[1];
dp[9] = cs[2];
dp[11] = cs[3];
dp[17] = cs[4];
dp[19] = cs[5];
break;
case 1: // +1 -1
dp[0] = cs[0];
dp[2] = -cs[1];
dp[8] = cs[2];
dp[10] = -cs[3];
dp[16] = cs[4];
dp[18] = -cs[5];
dp[1] = cs[0];
dp[3] = -cs[1];
dp[9] = cs[2];
dp[11] = -cs[3];
dp[17] = cs[4];
dp[19] = -cs[5];
break;
case 2: // +j +j
dp[1] = cs[0];
dp[3] = cs[1];
dp[9] = cs[2];
dp[11] = cs[3];
dp[17] = cs[4];
dp[19] = cs[5];
dp[0] = -cs[0];
dp[2] = -cs[1];
dp[8] = -cs[2];
dp[10] = -cs[3];
dp[16] = -cs[4];
dp[18] = -cs[5];
break;
case 3: // +j -j
dp[1] = cs[0];
dp[3] = -cs[1];
dp[9] = cs[2];
dp[11] = -cs[3];
dp[17] = cs[4];
dp[19] = -cs[5];
dp[0] = -cs[0];
dp[2] = cs[1];
dp[8] = -cs[2];
dp[10] = cs[3];
dp[16] = -cs[4];
dp[18] = cs[5];
break;
default:
AssertFatal(1==0,"phich_coding.c: Illegal PHICH Number\n");
}
}
HI16 = 0;
//#ifdef DEBUG_PHICH
//#endif
/*
for (i=0;i<200;i++)
printf("re %d: %d %d\n",i,((int16_t*)&rxdataF_comp[0][i])[0],((int16_t*)&rxdataF_comp[0][i])[1]);
*/
for (phich_quad=0; phich_quad<3; phich_quad++) {
if (frame_parms->Ncp == 1)
reg_offset = (frame_parms->phich_reg[ngroup_PHICH][phich_quad]*4)+ (phich_quad*frame_parms->N_RB_DL*12);
else
reg_offset = (frame_parms->phich_reg[ngroup_PHICH][phich_quad]*4);
// msg("\n[PUSCH 0]PHICH (RX) quad %d (%d)=>",phich_quad,reg_offset);
dp = &d[phich_quad*8];;
for (i=0; i<8; i++) {
phich_d_ptr[i] = ((int16_t*)&rxdataF_comp[0][reg_offset])[i];
#ifdef DEBUG_PHICH
LOG_D(PHY,"%d,",((int16_t*)&rxdataF_comp[0][reg_offset])[i]);
#endif
HI16 += (phich_d_ptr[i] * dp[i]);
}
}
#ifdef DEBUG_PHICH
LOG_D(PHY,"\n");
LOG_D(PHY,"HI16 %d\n",HI16);
#endif
if (HI16>0) { //NACK
if (ue->ulsch_Msg3_active[eNB_id] == 1) {
LOG_I(PHY,"[UE %d][PUSCH %d][RAPROC] Frame %d subframe %d Msg3 PHICH, received NAK (%d) nseq %d, ngroup %d\n",
ue->Mod_id,harq_pid,
proc->frame_rx,
subframe,
HI16,
nseq_PHICH,
ngroup_PHICH);
ulsch->f_pusch += delta_PUSCH_acc[ulsch->harq_processes[harq_pid]->TPC];
LOG_I(PHY,"[PUSCH %d] AbsSubframe %d.%d: f_pusch (ACC) %d, adjusting by %d (TPC %d)\n",
harq_pid,proc->frame_rx,subframe,ulsch->f_pusch,
delta_PUSCH_acc[ulsch->harq_processes[harq_pid]->TPC],
ulsch->harq_processes[harq_pid]->TPC);
ulsch->harq_processes[harq_pid]->subframe_scheduling_flag = 1;
// ulsch->harq_processes[harq_pid]->Ndi = 0;
ulsch->harq_processes[harq_pid]->round++;
ulsch->harq_processes[harq_pid]->rvidx = rv_table[ulsch->harq_processes[harq_pid]->round&3];
if (ulsch->harq_processes[harq_pid]->round>=ue->frame_parms.maxHARQ_Msg3Tx) {
ulsch->harq_processes[harq_pid]->subframe_scheduling_flag =0;
ulsch->harq_processes[harq_pid]->status = SCH_IDLE;
// inform MAC that Msg3 transmission has failed
ue->ulsch_Msg3_active[eNB_id] = 0;
}
} else {
#ifdef UE_DEBUG_TRACE
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH, received NAK (%d) nseq %d, ngroup %d round %d (Mlimit %d)\n",
ue->Mod_id,harq_pid,
proc->frame_rx%1024,
subframe,
HI16,
nseq_PHICH,
ngroup_PHICH,
ulsch->harq_processes[harq_pid]->round,
ulsch->Mlimit);
#endif
// ulsch->harq_processes[harq_pid]->Ndi = 0;
ulsch->harq_processes[harq_pid]->round++;
if ( ulsch->harq_processes[harq_pid]->round >= (ulsch->Mlimit - 1) )
{
// this is last push re transmission
ulsch->harq_processes[harq_pid]->rvidx = rv_table[ulsch->harq_processes[harq_pid]->round&3];
ulsch->O_RI = 0;
ulsch->O = 0;
ulsch->uci_format = HLC_subband_cqi_nopmi;
// disable phich decoding since it is the last retransmission
ulsch->harq_processes[harq_pid]->status = SCH_IDLE;
//ulsch->harq_processes[harq_pid]->subframe_scheduling_flag = 0;
//ulsch->harq_processes[harq_pid]->round = 0;
//LOG_I(PHY,"PUSCH MAX Retransmission acheived ==> flush harq buff (%d) \n",harq_pid);
//LOG_I(PHY,"[HARQ-UL harqId: %d] PHICH NACK MAX RETRANS(%d) ==> subframe_scheduling_flag = %d round: %d\n", harq_pid, ulsch->Mlimit, ulsch->harq_processes[harq_pid]->subframe_scheduling_flag, ulsch->harq_processes[harq_pid]->round);
}
else
{
// ulsch->harq_processes[harq_pid]->subframe_scheduling_flag = 1;
ulsch->harq_processes[harq_pid]->rvidx = rv_table[ulsch->harq_processes[harq_pid]->round&3];
ulsch->O_RI = 0;
ulsch->O = 0;
ulsch->uci_format = HLC_subband_cqi_nopmi;
//LOG_I(PHY,"[HARQ-UL harqId: %d] PHICH NACK ==> subframe_scheduling_flag = %d round: %d\n", harq_pid, ulsch->harq_processes[harq_pid]->subframe_scheduling_flag,ulsch->harq_processes[harq_pid]->round);
}
}
#if T_TRACER
T(T_UE_PHY_ULSCH_UE_NACK, T_INT(eNB_id), T_INT(proc->frame_rx%1024), T_INT(subframe), T_INT(ulsch->rnti),
T_INT(harq_pid));
#endif
} else { //ACK
if (ue->ulsch_Msg3_active[eNB_id] == 1) {
LOG_D(PHY,"[UE %d][PUSCH %d][RAPROC] Frame %d subframe %d Msg3 PHICH, received ACK (%d) nseq %d, ngroup %d\n\n",
ue->Mod_id,harq_pid,
proc->frame_rx,
subframe,
HI16,
nseq_PHICH,ngroup_PHICH);
} else {
#ifdef UE_DEBUG_TRACE
LOG_D(PHY,"[UE %d][PUSCH %d] Frame %d subframe %d PHICH, received ACK (%d) nseq %d, ngroup %d\n\n",
ue->Mod_id,harq_pid,
proc->frame_rx%1024,
subframe, HI16,
nseq_PHICH,ngroup_PHICH);
#endif
}
// LOG_I(PHY,"[HARQ-UL harqId: %d] subframe_scheduling_flag = %d \n",harq_pid, ulsch->harq_processes[harq_pid]->subframe_scheduling_flag);
// Incase of adaptive retransmission, PHICH is always decoded as ACK (at least with OAI-eNB)
// Workaround:
// rely only on DCI0 decoding and check if NDI has toggled
// save current harq_processes content in temporary struct
// harqId-8 corresponds to the temporary struct. In total we have 8 harq process(0 ..7) + 1 temporary harq process()
//ulsch->harq_processes[8] = ulsch->harq_processes[harq_pid];
ulsch->harq_processes[harq_pid]->status = SCH_IDLE;
ulsch->harq_processes[harq_pid]->round = 0;
ulsch->harq_processes[harq_pid]->subframe_scheduling_flag = 0;
// inform MAC?
ue->ulsch_Msg3_active[eNB_id] = 0;
#if T_TRACER
T(T_UE_PHY_ULSCH_UE_ACK, T_INT(eNB_id), T_INT(proc->frame_rx%1024), T_INT(subframe), T_INT(ulsch->rnti),
T_INT(harq_pid));
#endif
}
}
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