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srsLTE
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pregenerate dci locations

This commit is contained in:
Ismael Gomez 2016-11-08 17:01:14 +01:00
parent 3ad996cf90
commit 3a8c813809
7 changed files with 62 additions and 31 deletions
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15
srslte/include/srslte/ue/ue_dl.h
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@ -60,6 +60,18 @@
#include "srslte/config.h"
#define MAX_CANDIDATES_UE 16 // From 36.213 Table 9.1.1-1
#define MAX_CANDIDATES_COM 6 // From 36.213 Table 9.1.1-1
#define MAX_CANDIDATES (MAX_CANDIDATES_UE + MAX_CANDIDATES_COM)
typedef struct {
srslte_dci_format_t format;
srslte_dci_location_t loc[MAX_CANDIDATES];
uint32_t nof_locations;
} dci_blind_search_t;
typedef struct SRSLTE_API {
srslte_pcfich_t pcfich;
srslte_pdcch_t pdcch;
@ -85,7 +97,10 @@ typedef struct SRSLTE_API {
uint64_t nof_detected;
uint16_t current_rnti;
dci_blind_search_t current_ss_ue[3][10];
dci_blind_search_t current_ss_common[3];
srslte_dci_location_t last_location;
srslte_dci_location_t last_location_ul;
srslte_dci_msg_t pending_ul_dci_msg;
uint16_t pending_ul_dci_rnti;

2
srslte/lib/enb/enb_dl.c
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@ -37,7 +37,7 @@
#define CURRENT_SLOTLEN_RE SRSLTE_SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define CURRENT_SFLEN_RE SRSLTE_SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define SRSLTE_ENB_RF_AMP 0.8
#define SRSLTE_ENB_RF_AMP 0.5
int srslte_enb_dl_init(srslte_enb_dl_t *q, srslte_cell_t cell, uint32_t nof_rnti)
{

2
srslte/lib/enb/enb_ul.c
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@ -73,7 +73,7 @@ int srslte_enb_ul_init(srslte_enb_ul_t *q, srslte_cell_t cell,
fprintf(stderr, "Error initiating FFT\n");
goto clean_exit;
}
srslte_ofdm_set_normalize(&q->fft, true);
srslte_ofdm_set_normalize(&q->fft, false);
srslte_ofdm_set_freq_shift(&q->fft, -0.5);
if (srslte_pucch_init(&q->pucch, q->cell)) {

2
srslte/lib/phch/test/pdcch_file_test.c
View File

@ -34,8 +34,6 @@
char *input_file_name = NULL;
#define MAX_CANDIDATES 16
srslte_cell_t cell = {
6, // cell.cell.cell.nof_prb
1, // cell.cell.nof_ports

1
srslte/lib/phch/test/pdcch_test_mex.c
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@ -36,7 +36,6 @@
#define INPUT prhs[2]
#define NOF_INPUTS 3
#define MAX_CANDIDATES 16
srslte_dci_format_t ue_formats[] = {SRSLTE_DCI_FORMAT1A,SRSLTE_DCI_FORMAT1}; // SRSLTE_DCI_FORMAT1B should go here also

2
srslte/lib/phch/test/pdsch_pdcch_file_test.c
View File

@ -32,8 +32,6 @@
#include "srslte/srslte.h"
#define MAX_CANDIDATES 16
char *input_file_name = NULL;
srslte_cell_t cell = {

69
srslte/lib/ue/ue_dl.c
View File

@ -37,7 +37,6 @@
#define CURRENT_SLOTLEN_RE SRSLTE_SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define CURRENT_SFLEN_RE SRSLTE_SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define MAX_LOCATIONS 64
static srslte_dci_format_t ue_formats[] = {SRSLTE_DCI_FORMAT1A, SRSLTE_DCI_FORMAT1}; // Only TM1 and TM2 are currently supported
const uint32_t nof_ue_formats = 2;
@ -159,6 +158,15 @@ void srslte_ue_dl_free(srslte_ue_dl_t *q) {
*/
void srslte_ue_dl_set_rnti(srslte_ue_dl_t *q, uint16_t rnti) {
srslte_pdsch_set_rnti(&q->pdsch, rnti);
// Compute UE-specific and Common search space for this RNTI
for (int cfi=0;cfi<3;cfi++) {
for (int sf_idx=0;sf_idx<10;sf_idx++) {
q->current_ss_ue[cfi][sf_idx].nof_locations = srslte_pdcch_ue_locations(&q->pdcch, q->current_ss_ue[cfi][sf_idx].loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
}
q->current_ss_common[cfi].nof_locations = srslte_pdcch_common_locations(&q->pdcch, q->current_ss_common[cfi].loc, MAX_CANDIDATES_COM, cfi);
}
q->current_rnti = rnti;
}
@ -325,15 +333,6 @@ uint32_t srslte_ue_dl_get_ncce(srslte_ue_dl_t *q) {
return q->last_location.ncce;
}
#define MAX_CANDIDATES_UE 16 // From 36.213 Table 9.1.1-1
#define MAX_CANDIDATES_COM 6 // From 36.213 Table 9.1.1-1
#define MAX_CANDIDATES (MAX_CANDIDATES_UE + MAX_CANDIDATES_COM)
typedef struct {
srslte_dci_format_t format;
srslte_dci_location_t loc[MAX_CANDIDATES];
uint32_t nof_locations;
} dci_blind_search_t;
static int dci_blind_search(srslte_ue_dl_t *q, dci_blind_search_t *search_space, uint16_t rnti, srslte_dci_msg_t *dci_msg)
{
int ret = SRSLTE_ERROR;
@ -354,10 +353,15 @@ static int dci_blind_search(srslte_ue_dl_t *q, dci_blind_search_t *search_space,
{
q->pending_ul_dci_rnti = crc_rem;
memcpy(&q->pending_ul_dci_msg, dci_msg, sizeof(srslte_dci_msg_t));
memcpy(&q->last_location_ul, &search_space->loc[i], sizeof(srslte_dci_location_t));
// Else if we found it, save location and leave
} else if (dci_msg->format == search_space->format) {
ret = 1;
memcpy(&q->last_location, &search_space->loc[i], sizeof(srslte_dci_location_t));
if (search_space->format == SRSLTE_DCI_FORMAT0) {
memcpy(&q->last_location_ul, &search_space->loc[i], sizeof(srslte_dci_location_t));
} else {
memcpy(&q->last_location, &search_space->loc[i], sizeof(srslte_dci_location_t));
}
}
}
i++;
@ -380,10 +384,16 @@ int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t *q, uint32_t cfi, uint32_t sf_idx, u
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.format = SRSLTE_DCI_FORMAT0;
search_space.nof_locations = srslte_pdcch_ue_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
dci_blind_search_t *current_ss = &search_space;
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_ue[cfi-1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
}
current_ss->format = SRSLTE_DCI_FORMAT0;
INFO("Searching UL C-RNTI in %d ue locations\n", search_space.nof_locations);
return dci_blind_search(q, &search_space, rnti, dci_msg);
return dci_blind_search(q, current_ss, rnti, dci_msg);
} else {
return 0;
}
@ -428,25 +438,36 @@ static int find_dl_dci_type_siprarnti(srslte_ue_dl_t *q, uint32_t cfi, uint16_t
static int find_dl_dci_type_crnti(srslte_ue_dl_t *q, uint32_t cfi, uint32_t sf_idx, uint16_t rnti, srslte_dci_msg_t *dci_msg)
{
int ret = SRSLTE_SUCCESS;
dci_blind_search_t search_space;
dci_blind_search_t *current_ss = &search_space;
// Search UE-specific search space
dci_blind_search_t search_space;
search_space.nof_locations = srslte_pdcch_ue_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
INFO("Searching DL C-RNTI in %d ue locations, %d formats\n", search_space.nof_locations, nof_ue_formats);
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_ue[cfi-1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_UE, sf_idx, cfi, rnti);
}
INFO("Searching DL C-RNTI in %d ue locations, %d formats\n", current_ss->nof_locations, nof_ue_formats);
for (int f=0;f<nof_ue_formats;f++) {
search_space.format = ue_formats[f];
if ((ret = dci_blind_search(q, &search_space, rnti, dci_msg))) {
current_ss->format = ue_formats[f];
if ((ret = dci_blind_search(q, current_ss, rnti, dci_msg))) {
return ret;
}
}
// Search Format 1A in the Common SS also
search_space.format = SRSLTE_DCI_FORMAT1A;
search_space.nof_locations = srslte_pdcch_common_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_COM, cfi);
if (q->current_rnti == rnti) {
current_ss = &q->current_ss_common[cfi-1];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_common_locations(&q->pdcch, current_ss->loc, MAX_CANDIDATES_COM, cfi);
}
// Search for RNTI only if there is room for the common search space
if (search_space.nof_locations > 0) {
INFO("Searching DL C-RNTI in %d ue locations, format 1A\n", search_space.nof_locations, nof_ue_formats);
return dci_blind_search(q, &search_space, rnti, dci_msg);
if (current_ss->nof_locations > 0) {
current_ss->format = SRSLTE_DCI_FORMAT1A;
INFO("Searching DL C-RNTI in %d ue locations, format 1A\n", current_ss->nof_locations, nof_ue_formats);
return dci_blind_search(q, current_ss, rnti, dci_msg);
}
return SRSLTE_SUCCESS;
}