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Search DCI in UE space before common to avoid DCI size ambiguity. Fixes #1398

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master
Ismael Gomez 4 years ago committed by Xavier Arteaga
parent 6908e0fab1
commit 9b634b8d2a
3 changed files with 87 additions and 90 deletions
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1
lib/include/srslte/phy/phch/dci.h
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@ -55,6 +55,7 @@ typedef struct {
bool cif_present;
bool srs_request_enabled;
bool ra_format_enabled;
bool search_in_common;
} srslte_dci_cfg_t;
typedef struct SRSLTE_API {

174
lib/src/phy/ue/ue_dl.c
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@ -489,6 +489,63 @@ static int dci_blind_search(srslte_ue_dl_t* q,
return nof_dci;
}
static int find_dci_ue_ss(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
uint16_t rnti,
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG],
const srslte_dci_format_t* formats,
uint32_t nof_formats,
bool is_ue)
{
int ret = SRSLTE_SUCCESS;
dci_blind_search_t search_space = {};
dci_blind_search_t* current_ss = &search_space;
uint32_t sf_idx = sf->tti % 10;
uint32_t cfi = sf->cfi;
srslte_dci_cfg_t dci_cfg = cfg->cfg.dci;
// Generate Search Space
if (is_ue) {
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_ue[MI_IDX(sf_idx)][cfi - 1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, sf, current_ss->loc, MAX_CANDIDATES_UE, rnti);
}
} else {
// Disable extended CSI request and SRS request in common SS
dci_cfg.multiple_csi_request_enabled = false;
dci_cfg.srs_request_enabled = false;
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_common[MI_IDX(sf_idx)][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 DCI in the SS
if (current_ss->nof_locations > 0) {
for (int f = 0; f < nof_formats; f++) {
srslte_dci_format_t format = formats[f];
INFO("Searching DCI format=%s in %d locations in %s SS\n",
srslte_dci_format_string(format),
current_ss->nof_locations,
is_ue ? "ue" : "common");
current_ss->format = format;
if ((ret = dci_blind_search(q, sf, rnti, current_ss, &dci_cfg, dci_msg))) {
return ret;
}
}
}
return SRSLTE_SUCCESS;
}
int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* dl_cfg,
@ -497,6 +554,7 @@ int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t* q,
{
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG];
uint32_t nof_msg = 0;
int ret = 0;
if (rnti) {
/* Do not search if an UL DCI is already pending */
@ -506,25 +564,23 @@ int srslte_ue_dl_find_ul_dci(srslte_ue_dl_t* q,
memcpy(dci_msg, q->pending_ul_dci_msg, sizeof(srslte_dci_msg_t) * nof_msg);
} else {
uint32_t sf_idx = sf->tti % 10;
uint32_t cfi = sf->cfi;
set_mi_value(q, sf, dl_cfg);
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = 0;
dci_blind_search_t* current_ss = &search_space;
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_ue[MI_IDX(sf_idx)][cfi - 1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, sf, current_ss->loc, MAX_CANDIDATES_UE, rnti);
srslte_dci_format_t ul_format = SRSLTE_DCI_FORMAT0;
// Search first on the UE-specific SS to avoid ambiguity on DCI sizes
// Search UE-specific search space
if ((ret = find_dci_ue_ss(q, sf, dl_cfg, rnti, dci_msg, &ul_format, 1, true)) < 0) {
return SRSLTE_ERROR;
}
current_ss->format = SRSLTE_DCI_FORMAT0;
INFO("Searching UL C-RNTI in %d ue locations\n", search_space.nof_locations);
nof_msg = dci_blind_search(q, sf, rnti, current_ss, &dl_cfg->cfg.dci, dci_msg);
// Search common SS if no DCI present in UE SS
if (ret == 0 && dl_cfg->cfg.dci.search_in_common) {
if ((ret = find_dci_ue_ss(q, sf, dl_cfg, rnti, dci_msg, &ul_format, 1, false)) < 0) {
return SRSLTE_ERROR;
}
}
nof_msg = (uint32_t)ret;
}
// Unpack DCI messages
@ -549,95 +605,33 @@ static int find_dl_dci_type_siprarnti(srslte_ue_dl_t* q,
uint16_t rnti,
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG])
{
int ret = 0;
srslte_dci_cfg_t dci_cfg = dl_cfg->cfg.dci;
// Configure and run DCI blind search
dci_blind_search_t search_space;
search_space.nof_locations = srslte_pdcch_common_locations(&q->pdcch, search_space.loc, MAX_CANDIDATES_COM, sf->cfi);
INFO("Searching SI/P/RA-RNTI in %d common locations, %d formats, tti=%d, cfi=%d, rnti=0x%x\n",
search_space.nof_locations,
nof_common_formats,
sf->tti,
sf->cfi,
rnti);
// Disable extended CSI request and SRS request for non C-RNTI
dci_cfg.multiple_csi_request_enabled = false;
dci_cfg.srs_request_enabled = false;
// Search for RNTI only if there is room for the common search space
if (search_space.nof_locations > 0) {
for (uint32_t f = 0; f < nof_common_formats; f++) {
search_space.format = common_formats[f];
if ((ret = dci_blind_search(q, sf, rnti, &search_space, &dci_cfg, dci_msg))) {
return ret;
}
}
}
return SRSLTE_SUCCESS;
return find_dci_ue_ss(q, sf, dl_cfg, rnti, dci_msg, common_formats, nof_common_formats, false);
}
// Blind search for C-RNTI
static int find_dl_dci_type_crnti(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
srslte_ue_dl_cfg_t* dl_cfg,
uint16_t rnti,
srslte_dci_msg_t dci_msg[SRSLTE_MAX_DCI_MSG])
{
int ret = SRSLTE_SUCCESS;
dci_blind_search_t search_space;
dci_blind_search_t* current_ss = &search_space;
uint32_t sf_idx = sf->tti % 10;
uint32_t cfi = sf->cfi;
srslte_dci_cfg_t dci_cfg = cfg->cfg.dci;
// Search first Common SS
// Disable extended CSI request and SRS request in common SS
dci_cfg.multiple_csi_request_enabled = false;
dci_cfg.srs_request_enabled = false;
int ret = SRSLTE_SUCCESS;
// Search Format 1A in the Common SS also
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_common[MI_IDX(sf_idx)][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 (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);
if ((ret = dci_blind_search(q, sf, rnti, current_ss, &dci_cfg, dci_msg))) {
return ret;
}
if (dl_cfg->cfg.tm > SRSLTE_TM8) {
ERROR("Searching DL CRNTI: Invalid TM=%d\n", dl_cfg->cfg.tm + 1);
return SRSLTE_ERROR;
}
// Search first on the UE-specific SS to avoid ambiguity on DCI sizes
// Search UE-specific search space
dci_cfg = cfg->cfg.dci;
if (q->pregen_rnti == rnti) {
current_ss = &q->current_ss_ue[MI_IDX(sf_idx)][cfi - 1][sf_idx];
} else {
// If locations are not pre-generated, generate them now
current_ss->nof_locations = srslte_pdcch_ue_locations(&q->pdcch, sf, current_ss->loc, MAX_CANDIDATES_UE, rnti);
}
if (cfg->cfg.tm > SRSLTE_TM8) {
ERROR("Searching DL CRNTI: Invalid TM=%d\n", cfg->cfg.tm + 1);
return SRSLTE_ERROR;
if ((ret = find_dci_ue_ss(q, sf, dl_cfg, rnti, dci_msg, ue_dci_formats[dl_cfg->cfg.tm], 2, true))) {
return ret;
}
for (int f = 0; f < 2; f++) {
srslte_dci_format_t format = ue_dci_formats[cfg->cfg.tm][f];
INFO("Searching DL C-RNTI %s in %d ue locations\n", srslte_dci_format_string(format), current_ss->nof_locations);
current_ss->format = format;
if ((ret = dci_blind_search(q, sf, rnti, current_ss, &dci_cfg, dci_msg))) {
// Search common SS if no DCI present in UE SS
if (dl_cfg->cfg.dci.search_in_common) {
srslte_dci_format_t common_format = SRSLTE_DCI_FORMAT1A;
if ((ret = find_dci_ue_ss(q, sf, dl_cfg, rnti, dci_msg, &common_format, 1, false))) {
return ret;
}
}

2
srsue/src/phy/sf_worker.cc
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@ -188,6 +188,8 @@ void sf_worker::set_config(uint32_t cc_idx, srslte::phy_cfg_t& phy_cfg)
if (cc_idx > 0) {
// Update DCI config for PCell
srslte_dci_cfg_t dci_cfg = phy_cfg.dl_cfg.dci;
// Search common SS in PCell only
dci_cfg.search_in_common = true;
cc_workers[0]->upd_config_dci(dci_cfg);
}
} else {

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