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openairinterface5g/openair1/PHY/LTE_TRANSPORT/dci.c
T
Cedric Roux 5775d325e0 phy: do not put random bits in unused DCI 
This used to be done to ease power estimation in the UE,
but this is not correct. Let's put no energy in the REs
with no DCI data, which is what needs to be done.

Plus it consumes a lot of CPU because of calling taus()
way too much.
2019-07-11 15:26:00 +02:00

524 lines
18 KiB
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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/dci.c
* \brief Implements PDCCH physical channel TX/RX procedures (36.211) and DCI encoding/decoding (36.212/36.213). Current LTE compliance V8.6 2009-03.
* \author R. Knopp
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr
* \note
* \warning
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "PHY/defs_eNB.h"
#include "PHY/phy_extern.h"
#include "SCHED/sched_eNB.h"
#include "SIMULATION/TOOLS/sim.h" // for taus
#include "PHY/sse_intrin.h"
#include "transport_proto.h"
#include "transport_common_proto.h"
#include "assertions.h"
#include "T.h"
#include "common/utils/LOG/log.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
#include "PHY/LTE_TRANSPORT/transport_extern.h"
#include "PHY/LTE_REFSIG/lte_refsig.h"
#include "targets/RT/USER/lte-softmodem.h"
//#define DEBUG_DCI_ENCODING 1
//#define DEBUG_DCI_DECODING 1
//#define DEBUG_PHY
//#undef ALL_AGGREGATION
//extern uint16_t phich_reg[MAX_NUM_PHICH_GROUPS][3];
//extern uint16_t pcfich_reg[4];
//static uint8_t d[3*(MAX_DCI_SIZE_BITS + 16) + 96];
//static uint8_t w[3*3*(MAX_DCI_SIZE_BITS+16)];
void dci_encoding(uint8_t *a,
uint8_t A,
uint16_t E,
uint8_t *e,
uint16_t rnti) {
uint8_t D = (A + 16);
uint32_t RCC;
uint8_t d[3*(MAX_DCI_SIZE_BITS + 16) + 96];
uint8_t w[3*3*(MAX_DCI_SIZE_BITS+16)];
#ifdef DEBUG_DCI_ENCODING
int32_t i;
printf("Doing DCI encoding for %d bits, e %p, rnti %x, E %d\n",A,e,rnti,E);
#endif
// encode dci
memset((void *)d,LTE_NULL,96);
ccodelte_encode(A,2,a,d+96,rnti);
#ifdef DEBUG_DCI_ENCODING
for (i=0; i<16+A; i++)
printf("%d : (%d,%d,%d)\n",i,*(d+96+(3*i)),*(d+97+(3*i)),*(d+98+(3*i)));
printf("Doing DCI interleaving for %d coded bits, e %p\n",D*3,e);
#endif
RCC = sub_block_interleaving_cc(D,d+96,w);
#ifdef DEBUG_DCI_ENCODING
if (E>1000) printf("Doing DCI rate matching for %d channel bits, RCC %d, e %p\n",E,RCC,e);
#endif
lte_rate_matching_cc(RCC,E,w,e);
}
uint8_t *generate_dci0(uint8_t *dci,
uint8_t *e,
uint8_t DCI_LENGTH,
uint16_t coded_bits,
uint16_t rnti) {
uint8_t dci_flip[8];
#ifdef DEBUG_DCI_ENCODING
for (int i=0; i<1+((DCI_LENGTH+16)/8); i++)
printf("i %d : %x\n",i,dci[i]);
#endif
if (DCI_LENGTH<=32) {
dci_flip[0] = dci[3];
dci_flip[1] = dci[2];
dci_flip[2] = dci[1];
dci_flip[3] = dci[0];
#ifdef DEBUG_DCI_ENCODING
printf("DCI => %x,%x,%x,%x\n",
dci_flip[0],dci_flip[1],dci_flip[2],dci_flip[3]);
#endif
} else {
dci_flip[0] = dci[7];
dci_flip[1] = dci[6];
dci_flip[2] = dci[5];
dci_flip[3] = dci[4];
dci_flip[4] = dci[3];
dci_flip[5] = dci[2];
dci_flip[6] = dci[1];
dci_flip[7] = dci[0];
#ifdef DEBUG_DCI_ENCODING
printf("DCI => %x,%x,%x,%x,%x,%x,%x,%x\n",
dci_flip[0],dci_flip[1],dci_flip[2],dci_flip[3],
dci_flip[4],dci_flip[5],dci_flip[6],dci_flip[7]);
#endif
}
dci_encoding(dci_flip,DCI_LENGTH,coded_bits,e,rnti);
return(e+coded_bits);
}
//uint32_t Y;
void pdcch_interleaving(LTE_DL_FRAME_PARMS *frame_parms,int32_t **z, int32_t **wbar,uint8_t n_symbols_pdcch,uint8_t mi) {
int32_t *wptr,*wptr2,*zptr;
uint32_t Mquad = get_nquad(n_symbols_pdcch,frame_parms,mi);
uint32_t RCC = (Mquad>>5), ND;
uint32_t row,col,Kpi,index;
int32_t i,k,a;
#ifdef RM_DEBUG
int32_t nulled=0;
#endif
uint32_t Msymb=(DCI_BITS_MAX/2);
int32_t wtemp[2][Msymb];
// printf("[PHY] PDCCH Interleaving Mquad %d (Nsymb %d)\n",Mquad,n_symbols_pdcch);
if ((Mquad&0x1f) > 0)
RCC++;
Kpi = (RCC<<5);
ND = Kpi - Mquad;
k=0;
for (col=0; col<32; col++) {
index = bitrev_cc_dci[col];
for (row=0; row<RCC; row++) {
//printf("col %d, index %d, row %d\n",col,index,row);
if (index>=ND) {
for (a=0; a<frame_parms->nb_antenna_ports_eNB; a++) {
//printf("a %d k %d\n",a,k);
wptr = &wtemp[a][k<<2];
zptr = &z[a][(index-ND)<<2];
//printf("wptr=%p, zptr=%p\n",wptr,zptr);
wptr[0] = zptr[0];
wptr[1] = zptr[1];
wptr[2] = zptr[2];
wptr[3] = zptr[3];
}
k++;
}
index+=32;
}
}
// permutation
for (i=0; i<Mquad; i++) {
for (a=0; a<frame_parms->nb_antenna_ports_eNB; a++) {
//wptr = &wtemp[a][i<<2];
//wptr2 = &wbar[a][((i+frame_parms->Nid_cell)%Mquad)<<2];
wptr = &wtemp[a][((i+frame_parms->Nid_cell)%Mquad)<<2];
wptr2 = &wbar[a][i<<2];
wptr2[0] = wptr[0];
wptr2[1] = wptr[1];
wptr2[2] = wptr[2];
wptr2[3] = wptr[3];
}
}
}
void pdcch_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
uint8_t subframe,
uint8_t *e,
uint32_t length) {
int i;
uint8_t reset;
uint32_t x1, x2, s=0;
//LOG_D(PHY, "%s(fp, subframe:%d, e, length:%d)\n", __FUNCTION__, subframe, length);
reset = 1;
// x1 is set in lte_gold_generic
x2 = (subframe<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.8.2
for (i=0; i<length; i++) {
if ((i&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
//printf("lte_gold[%d]=%x\n",i,s);
reset = 0;
}
// printf("scrambling %d : e %d, c %d\n",i,e[i],((s>>(i&0x1f))&1));
if (e[i] != 2) // <NIL> element is 2
e[i] = (e[i]&1) ^ ((s>>(i&0x1f))&1);
}
}
uint8_t generate_dci_top(uint8_t num_pdcch_symbols,
uint8_t num_dci,
DCI_ALLOC_t *dci_alloc,
uint32_t n_rnti,
int16_t amp,
LTE_DL_FRAME_PARMS *frame_parms,
int32_t **txdataF,
uint32_t subframe) {
uint8_t *e_ptr;
int8_t L;
uint32_t i, lprime;
uint32_t gain_lin_QPSK,kprime,kprime_mod12,mprime,nsymb,symbol_offset,tti_offset;
int16_t re_offset;
uint8_t mi = get_mi(frame_parms,subframe);
uint8_t e[DCI_BITS_MAX];
uint32_t Msymb=(DCI_BITS_MAX/2);
int32_t yseq0[Msymb],yseq1[Msymb],wbar0[Msymb],wbar1[Msymb];
int32_t *y[2];
int32_t *wbar[2];
int nushiftmod3 = frame_parms->nushift%3;
int Msymb2;
int split_flag=0;
switch (frame_parms->N_RB_DL) {
case 100:
Msymb2 = Msymb;
break;
case 75:
Msymb2 = 3*Msymb/4;
break;
case 50:
Msymb2 = Msymb>>1;
break;
case 25:
Msymb2 = Msymb>>2;
break;
case 15:
Msymb2 = Msymb*15/100;
break;
case 6:
Msymb2 = Msymb*6/100;
break;
default:
Msymb2 = Msymb>>2;
break;
}
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_GENERATE_PCFICH,1);
generate_pcfich(num_pdcch_symbols,
amp,
frame_parms,
txdataF,
subframe);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_GENERATE_PCFICH,0);
wbar[0] = &wbar0[0];
wbar[1] = &wbar1[0];
y[0] = &yseq0[0];
y[1] = &yseq1[0];
/* reset all bits to <NIL>, here we set <NIL> elements as 2 */
memset(e, 2, DCI_BITS_MAX);
e_ptr = e;
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_GENERATE_DCI0,1);
// generate DCIs in order of decreasing aggregation level, then common/ue spec
// MAC is assumed to have ordered the UE spec DCI according to the RNTI-based randomization
for (L=8; L>=1; L>>=1) {
for (i=0; i<num_dci; i++) {
if (dci_alloc[i].L == (uint8_t)L) {
LOG_D(PHY,"Generating DCI %d/%d (nCCE %d) of length %d, aggregation %d (%x), rnti %x\n",
i,num_dci,dci_alloc[i].firstCCE,dci_alloc[i].dci_length,dci_alloc[i].L,
*(unsigned int *)dci_alloc[i].dci_pdu,
dci_alloc[i].rnti);
if (dci_alloc[i].firstCCE>=0) {
e_ptr = generate_dci0(dci_alloc[i].dci_pdu,
e+(72*dci_alloc[i].firstCCE),
dci_alloc[i].dci_length,
72*dci_alloc[i].L,
dci_alloc[i].rnti);
}
}
}
}
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_GENERATE_DCI0,0);
// Scrambling
#ifdef DEBUG_DCI_ENCODING
printf("pdcch scrambling\n");
#endif
//LOG_D(PHY, "num_pdcch_symbols:%d mi:%d nquad:%d\n", num_pdcch_symbols, mi, get_nquad(num_pdcch_symbols, frame_parms, mi));
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_SCRAMBLING,1);
pdcch_scrambling(frame_parms,
subframe,
e,
8*get_nquad(num_pdcch_symbols, frame_parms, mi));
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_SCRAMBLING,0);
//72*get_nCCE(num_pdcch_symbols,frame_parms,mi));
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_MODULATION,1);
// Now do modulation
if (frame_parms->nb_antenna_ports_eNB==1)
gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
else
gain_lin_QPSK = amp/2;
e_ptr = e;
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH Modulation, Msymb %d, Msymb2 %d,gain_lin_QPSK %d\n",Msymb,Msymb2,gain_lin_QPSK);
#endif
//LOG_D(PHY,"%s() Msymb2:%d\n", __FUNCTION__, Msymb2);
if (frame_parms->nb_antenna_ports_eNB==1) { //SISO
for (i=0; i<Msymb2; i++) {
//((int16_t*)(&(y[0][i])))[0] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
//((int16_t*)(&(y[1][i])))[0] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
((int16_t *)(&(y[0][i])))[0] = (*e_ptr == 2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
((int16_t *)(&(y[1][i])))[0] = (*e_ptr == 2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
e_ptr++;
//((int16_t*)(&(y[0][i])))[1] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
//((int16_t*)(&(y[1][i])))[1] = (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
((int16_t *)(&(y[0][i])))[1] = (*e_ptr == 2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
((int16_t *)(&(y[1][i])))[1] = (*e_ptr == 2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
e_ptr++;
}
} else { //ALAMOUTI
for (i=0; i<Msymb2; i+=2) {
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH Modulation (TX diversity): REG %d\n",i>>2);
#endif
// first antenna position n -> x0
((int16_t *)&y[0][i])[0] = (*e_ptr==2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
e_ptr++;
((int16_t *)&y[0][i])[1] = (*e_ptr==2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
e_ptr++;
// second antenna position n -> -x1*
((int16_t *)&y[1][i])[0] = (*e_ptr==2) ? 0 : (*e_ptr == 1) ? gain_lin_QPSK : -gain_lin_QPSK;
e_ptr++;
((int16_t *)&y[1][i])[1] = (*e_ptr==2) ? 0 : (*e_ptr == 1) ? -gain_lin_QPSK : gain_lin_QPSK;
e_ptr++;
// fill in the rest of the ALAMOUTI precoding
((int16_t *)&y[0][i+1])[0] = -((int16_t *)&y[1][i])[0];
((int16_t *)&y[0][i+1])[1] = ((int16_t *)&y[1][i])[1];
((int16_t *)&y[1][i+1])[0] = ((int16_t *)&y[0][i])[0];
((int16_t *)&y[1][i+1])[1] = -((int16_t *)&y[0][i])[1];
}
}
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_MODULATION,0);
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH Interleaving\n");
#endif
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_INTERLEAVING,1);
// printf("y %p (%p,%p), wbar %p (%p,%p)\n",y,y[0],y[1],wbar,wbar[0],wbar[1]);
// This is the interleaving procedure defined in 36-211, first part of Section 6.8.5
pdcch_interleaving(frame_parms,&y[0],&wbar[0],num_pdcch_symbols,mi);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_INTERLEAVING,0);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_TX,1);
mprime=0;
nsymb = (frame_parms->Ncp==0) ? 14:12;
re_offset = frame_parms->first_carrier_offset;
// This is the REG allocation algorithm from 36-211, second part of Section 6.8.5
// printf("DCI (SF %d) : txdataF %p (0 %p)\n",subframe,&txdataF[0][512*14*subframe],&txdataF[0][0]);
#ifdef DEBUG_DCI_ENCODING
printf("kprime loop - N_RB_DL:%d lprime:num_pdcch_symbols:%d Ncp:%d pcfich:%02x,%02x,%02x,%02x ofdm_symbol_size:%d first_carrier_offset:%d nb_antenna_ports_eNB:%d\n",
frame_parms->N_RB_DL, num_pdcch_symbols,frame_parms->Ncp,
frame_parms->pcfich_reg[0],
frame_parms->pcfich_reg[1],
frame_parms->pcfich_reg[2],
frame_parms->pcfich_reg[3],
frame_parms->ofdm_symbol_size,
frame_parms->first_carrier_offset,
frame_parms->nb_antenna_ports_eNB
);
#endif
for (kprime=0; kprime<frame_parms->N_RB_DL*12; kprime++) {
for (lprime=0; lprime<num_pdcch_symbols; lprime++) {
symbol_offset = (uint32_t)frame_parms->ofdm_symbol_size*(lprime+(subframe*nsymb));
tti_offset = symbol_offset + re_offset;
(re_offset==(frame_parms->ofdm_symbol_size-2)) ? (split_flag=1) : (split_flag=0);
// printf("kprime %d, lprime %d => REG %d (symbol %d)\n",kprime,lprime,(lprime==0)?(kprime/6) : (kprime>>2),symbol_offset);
// if REG is allocated to PHICH, skip it
if (check_phich_reg(frame_parms,kprime,lprime,mi) == 1) {
#ifdef DEBUG_DCI_ENCODING
printf("generate_dci: skipping REG %d (kprime %d, lprime %d)\n",(lprime==0)?(kprime/6) : (kprime>>2),kprime,lprime);
#endif
} else {
// Copy REG to TX buffer
if ((lprime == 0)||
((lprime==1)&&(frame_parms->nb_antenna_ports_eNB == 4))) {
// first symbol, or second symbol+4 TX antennas skip pilots
kprime_mod12 = kprime%12;
if ((kprime_mod12 == 0) || (kprime_mod12 == 6)) {
// kprime represents REG
for (i=0; i<6; i++) {
if ((i!=(nushiftmod3))&&(i!=(nushiftmod3+3))) {
txdataF[0][tti_offset+i] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset+i] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset+i,*(short *)&wbar[0][mprime],*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
}
}
}
} else { // no pilots in this symbol
kprime_mod12 = kprime%12;
if ((kprime_mod12 == 0) || (kprime_mod12 == 4) || (kprime_mod12 == 8)) {
// kprime represents REG
if (split_flag==0) {
for (i=0; i<4; i++) {
txdataF[0][tti_offset+i] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset+i] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
LOG_I(PHY," PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset+i,*(short *)&wbar[0][mprime],*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
}
} else {
txdataF[0][tti_offset+0] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset+0] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset,*(short *)&wbar[0][mprime],*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
txdataF[0][tti_offset+1] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset+1] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
printf("PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset+1,*(short *)&wbar[0][mprime],*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
txdataF[0][tti_offset-frame_parms->ofdm_symbol_size+3] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset-frame_parms->ofdm_symbol_size+3] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset-frame_parms->ofdm_symbol_size+3,*(short *)&wbar[0][mprime],
*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
txdataF[0][tti_offset-frame_parms->ofdm_symbol_size+4] = wbar[0][mprime];
if (frame_parms->nb_antenna_ports_eNB > 1)
txdataF[1][tti_offset-frame_parms->ofdm_symbol_size+4] = wbar[1][mprime];
#ifdef DEBUG_DCI_ENCODING
printf(" PDCCH mapping mprime %d => %d (symbol %d re %d) -> (%d,%d)\n",mprime,tti_offset,symbol_offset,re_offset-frame_parms->ofdm_symbol_size+4,*(short *)&wbar[0][mprime],
*(1+(short *)&wbar[0][mprime]));
#endif
mprime++;
}
}
}
if (mprime>=Msymb2)
return(num_pdcch_symbols);
} // check_phich_reg
} //lprime loop
re_offset++;
if (re_offset == (frame_parms->ofdm_symbol_size))
re_offset = 1;
} // kprime loop
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PDCCH_TX,0);
return(num_pdcch_symbols);
}
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