int srslte_ue_dl_decode_rnti_rv(srslte_ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint16_t rnti, uint32_t rvidx)
{
srslte_dci_msg_t dci_msg;
srslte_ra_dl_dci_t dci_unpacked;
srslte_ra_dl_grant_t grant;
int ret = SRSLTE_ERROR;
if ((ret = srslte_ue_dl_decode_fft_estimate(q, input, sf_idx, &q->cfi)) < 0) {
return ret;
}
if (srslte_pdcch_extract_llr(&q->pdcch, q->sf_symbols, q->ce, 0, sf_idx, q->cfi)) {
fprintf(stderr, "Error extracting LLRs\n");
return SRSLTE_ERROR;
}
int found_dci = srslte_ue_dl_find_dl_dci(q, &dci_msg, q->cfi, sf_idx, rnti);
if (found_dci == 1) {
if (srslte_dci_msg_to_dl_grant(&dci_msg, rnti, q->cell.nof_prb, &dci_unpacked, &grant)) {
fprintf(stderr, "Error unpacking DCI\n");
return SRSLTE_ERROR;
}
ret = srslte_ue_dl_decode_rnti_rv_packet(q, &grant, data, q->cfi, sf_idx, rnti, rvidx);
}
if (found_dci == 1 && ret == SRSLTE_SUCCESS) {
return q->pdsch_cfg.grant.mcs.tbs;
} else {
return 0;
}
}
int srslte_ue_dl_find_and_decode(srslte_ue_dl_t* q,
srslte_dl_sf_cfg_t* sf,
srslte_ue_dl_cfg_t* cfg,
srslte_pdsch_cfg_t* pdsch_cfg,
uint8_t* data[SRSLTE_MAX_CODEWORDS],
bool acks[SRSLTE_MAX_CODEWORDS])
{
int ret = SRSLTE_ERROR;
srslte_dci_dl_t dci_dl;
srslte_pmch_cfg_t pmch_cfg;
srslte_pdsch_res_t pdsch_res[SRSLTE_MAX_CODEWORDS];
// Use default values for PDSCH decoder
ZERO_OBJECT(pmch_cfg);
uint32_t mi_set_len;
if (q->cell.frame_type == SRSLTE_TDD && !sf->tdd_config.configured) {
mi_set_len = 3;
} else {
mi_set_len = 1;
}
// Blind search PHICH mi value
ZERO_OBJECT(dci_dl);
ret = 0;
for (uint32_t i = 0; i < mi_set_len && !ret; i++) {
if (mi_set_len == 1) {
srslte_ue_dl_set_mi_auto(q);
} else {
srslte_ue_dl_set_mi_manual(q, i);
}
if ((ret = srslte_ue_dl_decode_fft_estimate(q, sf, cfg)) < 0) {
return ret;
}
ret = srslte_ue_dl_find_dl_dci(q, sf, cfg, pdsch_cfg->rnti, &dci_dl);
}
if (ret == 1) {
// Logging
char str[512];
srslte_dci_dl_info(&dci_dl, str, 512);
INFO("PDCCH: %s, snr=%.1f dB\n", str, q->chest_res.snr_db);
// Force known MBSFN grant
if (sf->sf_type == SRSLTE_SF_MBSFN) {
dci_dl.rnti = SRSLTE_MRNTI;
dci_dl.alloc_type = SRSLTE_RA_ALLOC_TYPE0;
dci_dl.type0_alloc.rbg_bitmask = 0xffffffff;
dci_dl.tb[0].rv = 0;
dci_dl.tb[0].mcs_idx = 2;
dci_dl.format = SRSLTE_DCI_FORMAT1;
}
// Convert DCI message to DL grant
if (srslte_ue_dl_dci_to_pdsch_grant(q, sf, cfg, &dci_dl, &pdsch_cfg->grant)) {
ERROR("Error unpacking DCI\n");
return SRSLTE_ERROR;
}
// Calculate RV if not provided in the grant and reset softbuffer
for (int i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
if (pdsch_cfg->grant.tb[i].enabled) {
if (pdsch_cfg->grant.tb[i].rv < 0) {
uint32_t sfn = sf->tti / 10;
uint32_t k = (sfn / 2) % 4;
pdsch_cfg->grant.tb[i].rv = ((uint32_t)ceilf((float)1.5 * k)) % 4;
}
srslte_softbuffer_rx_reset_tbs(pdsch_cfg->softbuffers.rx[i], (uint32_t)pdsch_cfg->grant.tb[i].tbs);
}
}
bool decode_enable = false;
for (uint32_t tb = 0; tb < SRSLTE_MAX_CODEWORDS; tb++) {
if (pdsch_cfg->grant.tb[tb].enabled) {
decode_enable = true;
pdsch_res[tb].payload = data[tb];
pdsch_res[tb].crc = false;
}
}
if (decode_enable) {
if (sf->sf_type == SRSLTE_SF_NORM) {
if (srslte_ue_dl_decode_pdsch(q, sf, pdsch_cfg, pdsch_res)) {
ERROR("ERROR: Decoding PDSCH\n");
ret = -1;
}
} else {
pmch_cfg.pdsch_cfg = *pdsch_cfg;
if (srslte_ue_dl_decode_pmch(q, sf, &pmch_cfg, pdsch_res)) {
ERROR("Decoding PMCH\n");
ret = -1;
}
}
}
for (uint32_t tb = 0; tb < SRSLTE_MAX_CODEWORDS; tb++) {
if (pdsch_cfg->grant.tb[tb].enabled) {
acks[tb] = pdsch_res[tb].crc;
}
}
}
return ret;
}
int srslte_ue_dl_decode_rnti(srslte_ue_dl_t *q,
uint8_t *data[SRSLTE_MAX_CODEWORDS], uint32_t tm, uint32_t tti, uint16_t rnti,
bool acks[SRSLTE_MAX_CODEWORDS]) {
srslte_mimo_type_t mimo_type;
srslte_dci_msg_t dci_msg;
srslte_ra_dl_dci_t dci_unpacked;
srslte_ra_dl_grant_t grant;
int ret = SRSLTE_ERROR;
uint32_t cfi;
uint32_t sf_idx = tti%10;
if ((ret = srslte_ue_dl_decode_fft_estimate_mbsfn(q, sf_idx, &cfi, SRSLTE_SF_NORM)) < 0) {
return ret;
}
float noise_estimate = srslte_chest_dl_get_noise_estimate(&q->chest);
// Uncoment next line to do ZF by default in pdsch_ue example
//float noise_estimate = 0;
if (srslte_pdcch_extract_llr_multi(&q->pdcch, q->sf_symbols_m, q->ce_m, noise_estimate, sf_idx, cfi)) {
fprintf(stderr, "Error extracting LLRs\n");
return SRSLTE_ERROR;
}
int found_dci = srslte_ue_dl_find_dl_dci(q, tm, cfi, sf_idx, rnti, &dci_msg);
if (found_dci == 1) {
if (srslte_dci_msg_to_dl_grant(&dci_msg, rnti, q->cell.nof_prb, q->cell.nof_ports, &dci_unpacked, &grant)) {
fprintf(stderr, "Error unpacking DCI\n");
return SRSLTE_ERROR;
}
/* ===== These lines of code are supposed to be MAC functionality === */
int rvidx[SRSLTE_MAX_CODEWORDS] = {1};
if (dci_unpacked.rv_idx < 0) {
uint32_t sfn = tti / 10;
uint32_t k = (sfn / 2) % 4;
for (int i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
if (grant.tb_en[i]) {
rvidx[i] = ((uint32_t) ceilf((float) 1.5 * k)) % 4;
srslte_softbuffer_rx_reset_tbs(q->softbuffers[i], (uint32_t) grant.mcs[i].tbs);
}
}
} else {
for (int i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
if (grant.tb_en[i]) {
switch (i) {
case 0:
rvidx[i] = (uint32_t) dci_unpacked.rv_idx;
break;
case 1:
rvidx[i] = (uint32_t) dci_unpacked.rv_idx_1;
break;
default:
ERROR("Wrong number of transport blocks");
return SRSLTE_ERROR;
}
srslte_softbuffer_rx_reset_tbs(q->softbuffers[i], (uint32_t) grant.mcs[i].tbs);
}
}
}
switch(dci_msg.format) {
case SRSLTE_DCI_FORMAT1:
case SRSLTE_DCI_FORMAT1A:
case SRSLTE_DCI_FORMAT1C:
if (q->cell.nof_ports == 1) {
mimo_type = SRSLTE_MIMO_TYPE_SINGLE_ANTENNA;
} else {
mimo_type = SRSLTE_MIMO_TYPE_TX_DIVERSITY;
}
break;
case SRSLTE_DCI_FORMAT2:
if (SRSLTE_RA_DL_GRANT_NOF_TB(&grant) == 1 && dci_unpacked.pinfo == 0) {
mimo_type = SRSLTE_MIMO_TYPE_TX_DIVERSITY;
} else {
mimo_type = SRSLTE_MIMO_TYPE_SPATIAL_MULTIPLEX;
}
break;
case SRSLTE_DCI_FORMAT2A:
if (SRSLTE_RA_DL_GRANT_NOF_TB(&grant) == 1 && dci_unpacked.pinfo == 0) {
mimo_type = SRSLTE_MIMO_TYPE_TX_DIVERSITY;
} else {
mimo_type = SRSLTE_MIMO_TYPE_CDD;
}
break;
/* Not implemented formats */
case SRSLTE_DCI_FORMAT0:
case SRSLTE_DCI_FORMAT1B:
case SRSLTE_DCI_FORMAT1D:
case SRSLTE_DCI_FORMAT2B:
default:
ERROR("Transmission mode not supported.");
return SRSLTE_ERROR;
}
if (srslte_ue_dl_cfg_grant(q, &grant, cfi, sf_idx, rvidx, mimo_type)) {
ERROR("Configuing PDSCH");
return SRSLTE_ERROR;
}
/* ===== End of MAC functionality ========== */
q->nof_detected++;
if (q->pdsch_cfg.grant.mcs[0].mod > 0 && q->pdsch_cfg.grant.mcs[0].tbs >= 0) {
ret = srslte_pdsch_decode(&q->pdsch, &q->pdsch_cfg, q->softbuffers,
q->sf_symbols_m, q->ce_m,
noise_estimate,
rnti, data, acks);
for (int tb = 0; tb < SRSLTE_MAX_TB; tb++) {
if (grant.tb_en[tb]) {
if (!acks[tb]) {
q->pdsch_pkt_errors++;
}
q->pdsch_pkts_total++;
}
}
if (ret == SRSLTE_ERROR) {
} else if (ret == SRSLTE_ERROR_INVALID_INPUTS) {
fprintf(stderr, "Error calling srslte_pdsch_decode()\n");
}
/* If we are in TM4 (Closed-Loop MIMO), compute condition number */
}
/*
printf("Saving signal...\n");
srslte_vec_save_file("input", input, sizeof(cf_t)*SRSLTE_SF_LEN_PRB(q->cell.nof_prb));
srslte_ue_dl_save_signal(q, &q->softbuffer, sf_idx, rvidx, rnti, cfi);
//exit(-1);
*/
}
if (found_dci == 1 && ret == SRSLTE_SUCCESS) {
return q->pdsch_cfg.grant.mcs[0].tbs;
} else {
return 0;
}
}
