int srslte_pmch_encode(srslte_pmch_t *q, srslte_pdsch_cfg_t *cfg, srslte_softbuffer_tx_t *softbuffer, uint8_t *data, uint16_t area_id, cf_t *sf_symbols[SRSLTE_MAX_PORTS]) { int i; /* Set pointers for layermapping & precoding */ cf_t *x[SRSLTE_MAX_LAYERS]; int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && cfg != NULL) { for (i=0;i<q->cell.nof_ports;i++) { if (sf_symbols[i] == NULL) { return SRSLTE_ERROR_INVALID_INPUTS; } } if (cfg->grant.mcs[0].tbs == 0) { return SRSLTE_ERROR_INVALID_INPUTS; } if (cfg->nbits[0].nof_re > q->max_re) { fprintf(stderr, "Error too many RE per subframe (%d). PMCH configured for %d RE (%d PRB)\n", cfg->nbits[0].nof_re, q->max_re, q->cell.nof_prb); return SRSLTE_ERROR_INVALID_INPUTS; } INFO("Encoding PMCH SF: %d, Mod %s, NofBits: %d, NofSymbols: %d, NofBitsE: %d, rv_idx: %d\n", cfg->sf_idx, srslte_mod_string(cfg->grant.mcs[0].mod), cfg->grant.mcs[0].tbs, cfg->nbits[0].nof_re, cfg->nbits[0].nof_bits, 0); /* number of layers equals number of ports */ for (i = 0; i < q->cell.nof_ports; i++) { x[i] = q->x[i]; } memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (SRSLTE_MAX_LAYERS - q->cell.nof_ports)); // TODO: use tb_encode directly if (srslte_dlsch_encode(&q->dl_sch, cfg, softbuffer, data, q->e)) { fprintf(stderr, "Error encoding TB\n"); return SRSLTE_ERROR; } /* scramble */ srslte_scrambling_bytes(&q->seqs[area_id]->seq[cfg->sf_idx], (uint8_t*) q->e, cfg->nbits[0].nof_bits); srslte_mod_modulate_bytes(&q->mod[cfg->grant.mcs[0].mod], (uint8_t*) q->e, q->d, cfg->nbits[0].nof_bits); /* No tx diversity in MBSFN */ memcpy(q->symbols[0], q->d, cfg->nbits[0].nof_re * sizeof(cf_t)); /* mapping to resource elements */ for (i = 0; i < q->cell.nof_ports; i++) { srslte_pmch_put(q, q->symbols[i], sf_symbols[i], cfg->nbits[0].lstart); } ret = SRSLTE_SUCCESS; } return ret; }
/** Converts the PDSCH data bits to symbols mapped to the slot ready for transmission */ int srslte_pdsch_encode_rnti(srslte_pdsch_t *q, srslte_pdsch_cfg_t *cfg, srslte_softbuffer_tx_t *softbuffer, uint8_t *data, uint16_t rnti, cf_t *sf_symbols[SRSLTE_MAX_PORTS]) { int i; /* Set pointers for layermapping & precoding */ cf_t *x[SRSLTE_MAX_LAYERS]; int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && data != NULL && cfg != NULL) { for (i=0; i<q->cell.nof_ports; i++) { if (sf_symbols[i] == NULL) { return SRSLTE_ERROR_INVALID_INPUTS; } } if (cfg->grant.mcs.tbs == 0) { return SRSLTE_ERROR_INVALID_INPUTS; } if (cfg->nbits.nof_re > q->max_re) { fprintf(stderr, "Error too many RE per subframe (%d). PDSCH configured for %d RE (%d PRB)\n", cfg->nbits.nof_re, q->max_re, q->cell.nof_prb); return SRSLTE_ERROR_INVALID_INPUTS; } INFO("Encoding PDSCH SF: %d, Mod %s, NofBits: %d, NofSymbols: %d, NofBitsE: %d, rv_idx: %d\n", cfg->sf_idx, srslte_mod_string(cfg->grant.mcs.mod), cfg->grant.mcs.tbs, cfg->nbits.nof_re, cfg->nbits.nof_bits, cfg->rv); /* number of layers equals number of ports */ for (i = 0; i < q->cell.nof_ports; i++) { x[i] = q->x[i]; } memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (SRSLTE_MAX_LAYERS - q->cell.nof_ports)); if (srslte_dlsch_encode(&q->dl_sch, cfg, softbuffer, data, q->e)) { fprintf(stderr, "Error encoding TB\n"); return SRSLTE_ERROR; } if (rnti != q->rnti) { srslte_sequence_t seq; if (srslte_sequence_pdsch(&seq, rnti, 0, 2 * cfg->sf_idx, q->cell.id, cfg->nbits.nof_bits)) { return SRSLTE_ERROR; } srslte_scrambling_bytes_offset(&seq, (uint8_t*) q->e, 0, cfg->nbits.nof_bits); srslte_sequence_free(&seq); } else { srslte_scrambling_bytes_offset(&q->seq[cfg->sf_idx], (uint8_t*) q->e, 0, cfg->nbits.nof_bits); } srslte_mod_modulate_bytes(&q->mod[cfg->grant.mcs.mod], (uint8_t*) q->e, q->d, cfg->nbits.nof_bits); /* TODO: only diversity supported */ if (q->cell.nof_ports > 1) { srslte_layermap_diversity(q->d, x, q->cell.nof_ports, cfg->nbits.nof_re); srslte_precoding_diversity(&q->precoding, x, q->symbols, q->cell.nof_ports, cfg->nbits.nof_re / q->cell.nof_ports); } else { memcpy(q->symbols[0], q->d, cfg->nbits.nof_re * sizeof(cf_t)); } /* mapping to resource elements */ for (i = 0; i < q->cell.nof_ports; i++) { srslte_pdsch_put(q, q->symbols[i], sf_symbols[i], &cfg->grant, cfg->nbits.lstart, cfg->sf_idx); } ret = SRSLTE_SUCCESS; } return ret; }