int srslte_ue_dl_decode_mbsfn(srslte_ue_dl_t * q,
uint8_t *data,
uint32_t tti)
{
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_MBSFN)) < 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;
grant.sf_type = SRSLTE_SF_MBSFN;
grant.mcs[0].idx = 2;
grant.tb_en[0] = true;
grant.tb_en[1] = false;
grant.nof_prb = q->pmch.cell.nof_prb;
srslte_dl_fill_ra_mcs(&grant.mcs[0], grant.nof_prb);
srslte_softbuffer_rx_reset_tbs(q->softbuffers[0], (uint32_t) grant.mcs[0].tbs);
for(int j = 0; j < 2; j++){
for(int f = 0; f < grant.nof_prb; f++){
grant.prb_idx[j][f] = true;
}
}
grant.Qm[0] = srslte_mod_bits_x_symbol(grant.mcs[0].mod);
// redundancy version is set to 0 for the PMCH
if (srslte_ue_dl_cfg_grant(q, &grant, cfi, sf_idx, SRSLTE_PMCH_RV, SRSLTE_MIMO_TYPE_SINGLE_ANTENNA)) {
return SRSLTE_ERROR;
}
if (q->pmch_cfg.grant.mcs[0].mod > 0 && q->pmch_cfg.grant.mcs[0].tbs >= 0) {
ret = srslte_pmch_decode_multi(&q->pmch, &q->pmch_cfg, q->softbuffers[0],
q->sf_symbols_m, q->ce_m,
noise_estimate,
q->current_mbsfn_area_id, data);
if (ret == SRSLTE_ERROR) {
q->pmch_pkt_errors++;
} else if (ret == SRSLTE_ERROR_INVALID_INPUTS) {
fprintf(stderr, "Error calling srslte_pmch_decode()\n");
}
}
q->pmch_pkts_total++;
if (ret == SRSLTE_SUCCESS) {
return q->pmch_cfg.grant.mcs[0].tbs;
} else {
return 0;
}
}
int srslte_ue_dl_decode_rnti_rv_packet(srslte_ue_dl_t *q, srslte_dci_msg_t *dci_msg, uint8_t *data,
uint32_t cfi, uint32_t sf_idx, uint16_t rnti, uint32_t rvidx)
{
int ret = SRSLTE_ERROR;
q->nof_detected++;
/* Setup PDSCH configuration for this CFI, SFIDX and RVIDX */
if (srslte_ue_dl_cfg_grant(q, dci_msg, cfi, sf_idx, rnti, rvidx)) {
return SRSLTE_ERROR;
}
if (q->pdsch_cfg.rv == 0) {
srslte_softbuffer_rx_reset(&q->softbuffer);
}
#ifdef PDSCH_DO_ZF
float noise_estimate = 0;
#else
float noise_estimate = srslte_chest_dl_get_noise_estimate(&q->chest);
#endif
if (q->pdsch_cfg.grant.mcs.mod > 0 && q->pdsch_cfg.grant.mcs.tbs >= 0) {
ret = srslte_pdsch_decode_rnti(&q->pdsch, &q->pdsch_cfg, &q->softbuffer,
q->sf_symbols, q->ce,
noise_estimate,
rnti, data);
if (ret == SRSLTE_ERROR) {
q->pkt_errors++;
} else if (ret == SRSLTE_ERROR_INVALID_INPUTS) {
fprintf(stderr, "Error calling srslte_pdsch_decode()\n");
} else if (ret == SRSLTE_SUCCESS) {
if (SRSLTE_VERBOSE_ISDEBUG()) {
INFO("Decoded Message: ", 0);
srslte_vec_fprint_hex(stdout, data, q->pdsch_cfg.grant.mcs.tbs);
}
}
q->pkts_total++;
}
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;
}
}
